WO2023148974A1 - Image display device and method for adjusting image display device - Google Patents

Abstract

An image display device comprises: a light-modulating element having an image-forming surface that modulates light to form an image; a prism facing the light-modulating element; a fixed plate fixed to the prism; a first movable plate connected to the fixed plate so as to be capable of sliding in a direction parallel to the image-forming surface; a first wire member of which one end is connected to the fixed plate and the other end is rotatable, and which is capable of displacing the first movable plate in a direction parallel to the image-forming surface by rotating; a second movable plate that holds the light-modulating element; and a second wire member of which one end is connected to the first movable plate and the other end is rotatable, and which is capable of displacing the second movable plate in a direction perpendicular to the image-forming surface by rotating.

Description

IMAGE DISPLAY DEVICE AND METHOD OF ADJUSTING IMAGE DISPLAY DEVICE

The present invention relates to an image display device having a light modulation element and an adjustment method for the image display device.

Conventionally, there has been known a projection type image display device that projects an image synthesized based on a plurality of colored lights onto a screen or the like. A projection-type image display apparatus, for example, irradiates a plurality of color lights on the corresponding light modulation elements through different optical paths, synthesizes the images formed by the respective light modulation elements by a photosynthesis prism, and synthesizes the images by the photosynthesis prism. projected on a screen, etc.

Such an image display device synthesizes images formed by a plurality of colored lights to form one image. There is also a shift in the image that is displayed. In order to solve this problem, there is a known technique for adjusting the positions of the light modulation elements for each color.

For example, Patent Document 1 discloses an image display device in which the position of the light modulation element can be adjusted by displacing the position of the light modulation element in a direction perpendicular to the optical axis direction. Further, for example, Patent Document 2 discloses an image display device capable of adjusting the position of the light modulation element by displacing the position of the light modulation element in a direction perpendicular to the optical axis direction and in a direction parallel to the optical axis direction. An apparatus is disclosed.

EP-A-1587315 WO2021/152827

However, since the image display device disclosed in Patent Document 1 can adjust the light modulation element only in the direction perpendicular to the optical axis direction, it cannot be adjusted in the direction parallel to the optical axis direction. In other words, the image display device disclosed in Patent Document 1 cannot adjust the focus of the image when the image is out of focus.

In addition, in the production process of the image display device disclosed in Patent Documents 1 and 2, UV (Ultra Violet) adhesive is used to bond parts together in order to fix the positional relationship between the photosynthetic prism and the light modulation element. There is a need to. However, when bonding with a UV adhesive, it takes time for the adhesive to harden, making it difficult to improve production efficiency. Moreover, since the UV adhesive is expensive, it is difficult to reduce the production cost of the image display device using the UV adhesive.

The present disclosure has been made in view of the above problems. An object of the present disclosure is to provide an image display device and an adjustment method for the image display device, which can fix the positional relationship between the photosynthetic prism and the light modulation element without using adhesion, and can adjust the position of the light modulation element. That is.

According to one aspect of the present disclosure, a light modulating element comprising an image forming surface that modulates light to form an image, a prism facing the light modulating element, a fixed plate fixed to the prism, and the fixed A first movable plate is connected to the plate so as to be slidable in a direction parallel to the image forming surface; one end is connected to the fixed plate; the other end is rotatable; a first wire member capable of displacing the movable plate in a direction parallel to the image forming surface; a second movable plate holding the light modulation element; one end of which is connected to the first movable plate; a second wire member whose end is rotatable and which can be rotated to displace the second movable plate in a direction perpendicular to the image forming surface.

According to another aspect of the present disclosure, a light modulating element comprising an image forming surface that modulates light to form an image, a prism facing the light modulating element, a fixed plate fixed to the prism, a first movable plate connected to the fixed plate so as to be slidable in a direction parallel to the image forming surface; one end connected to the fixed plate; a first wire member that can displace the first movable plate in a direction parallel to the image forming surface; a second movable plate that holds the light modulation element; and one end of which is connected to the first movable plate. and a second wire member, the other end of which is rotatable and which can be rotated to displace the second movable plate in a direction perpendicular to the image forming surface, wherein: After positioning the first movable plate in a direction parallel to the image forming surface by rotating one wire member, the image forming of the second movable plate is performed by rotating the second wire member. A method for adjusting an image display device is provided for positioning in a direction normal to a plane.

1 is a block diagram showing the configuration of an image display device according to an embodiment; FIG. 2 is a schematic diagram showing a specific configuration of the image display device of FIG. 1; FIG. 1 is a perspective view of a photosynthesis prism unit assembly according to the present embodiment; FIG. FIG. 4 is an exploded view showing an example of the configuration of a photosynthesis prism unit; FIG. 4 is a partial perspective view showing a connection mode between a first wire member and a fixing plate; It is a partial perspective view which shows the connection aspect of a 1st movable plate and a fixed plate. It is a sectional view showing typically the connection aspect of the 1st movable plate and a fixed plate. FIG. 4 is a partial perspective view showing a connection mode between a second wire member and a first movable plate; It is a partial perspective view which shows the connection aspect of a fixed plate, a 1st movable plate, and a 2nd movable plate.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, in the drawings, the same or equivalent components are denoted by the same reference numerals, and redundant description of the same or equivalent components will be omitted as appropriate.

FIG. 1 is a block diagram showing the configuration of an image display device 50 according to one embodiment. The image display device 50 is a device that synthesizes images formed based on a plurality of colored lights with a photosynthesis prism and projects the synthesized image. The image display device 50 can be configured by being included in a projector, for example.

In this embodiment, the image display device 50 has a housing 51 . The housing 51 in this embodiment is a mechanism that protects or holds each component of the image display device 50 . Therefore, the housing 51 does not necessarily have to have a box shape that forms the outer shape of the image display device 50. For example, the housing 51 may be a mechanism configured by a framework that holds each component included in the image display device 50. good. Further, the housing 51 may be configured as an outer box for the entire projector including the image display device 50 , and the housing 51 for the image display device 50 is an outer box for the projector configured separately from the housing 51 . It may be configured to be placed internally. Further, the image display device 50 does not necessarily have to include the housing 51 . In the present embodiment, the image display device 50 is assumed to include a housing 51 and will be described below.

The image display device 50 includes a light modulation element 52 having an image forming surface 52a that modulates light to form an image. In this embodiment, the light modulation element 52 is housed in the housing 51 . The light modulation element 52 may be, for example, a DMD (Digital Mirror Device) or an LCD (Liquid Crystal Display). The housing 51 has an operation surface 51 a that can be operated to adjust the position of the light modulation element 52 housed in the housing 51 . The operation surface 51a is provided on the outer surface of the housing 51, for example.

The image display device 50 further includes a holding section 53 and an adjusting section 55 . The holding portion 53 holds the light modulation element 52 so as to be displaceable at least in a direction perpendicular to the image forming surface 52a and a direction parallel to the image forming surface 52a. The details of the holding structure of the light modulation element 52 by the holding portion 53 will be described later.

The adjustment unit 55 is a mechanism that can adjust the position of the light modulation element 52 . In this embodiment, the adjustment portion 55 is configured including at least one wire member 54 . One end 54a of the wire member 54 is connected to the holding portion 53, and the other end 54b is rotatably attached to the operation surface 51a. The holding portion 53 has a movable portion 53a that is displaced (moved) in a direction perpendicular to or parallel to the image forming surface 52a by rotating the other end 54b of the wire member 54. As shown in FIG.

Note that the other end 54b of the wire member 54 does not necessarily have to be attached to the operation surface 51a. The other end 54b of the wire member 54 may be arranged so as to be rotatable by the user from outside the image display device 50 . For example, when the housing 51 of the image display device 50 is arranged inside the outer box of the projector configured separately from the housing 51, when the user removes the outer box of the projector, the other end 54b The other end 54b may be arranged at a position where it is possible to operate the . Alternatively, for example, a part of the outer box of the projector may be cut out, and the other end 54b may be arranged at a position where the user can operate from the cut out position. Therefore, the other end 54b may be arranged so as to be rotatable by the user at least from the outside of the image display device 50. As shown in FIG.

FIG. 2 is a schematic diagram showing a specific configuration of the image display device 50 of FIG. In FIG. 2, for convenience, only the configuration related to the characteristic portions of the image display device 50 is shown, and optical components including, for example, a light source, mirrors and lenses are omitted as appropriate.

As shown in FIG. 2, the image display device 50 according to this embodiment includes a housing 51 having an operation surface 51a. The housing 51 accommodates three optical modulation elements 52R, 52G, and 52B as the optical modulation elements 52. As shown in FIG. The light modulation elements 52R, 52G and 52B form images of different color lights. Here, the light modulation element 52R modulates red light to form a red image. The light modulation element 52G modulates green light to form a green image. The light modulation element 52B modulates the blue light to form a blue image. Hereinafter, in this specification, when the three optical modulation elements 52R, 52G and 52B are not distinguished, they are simply referred to as "the optical modulation elements 52". Note that the number of light modulation elements 52 included in the image display device 50 does not necessarily have to be three. The image display device 50 may include any plurality of light modulation elements 52 .

The image display device 50 further includes a photosynthesis prism 56 . In this embodiment, the photosynthetic prism 56 is fixed to the housing 51 inside the housing 51 . Light combining prism 56 faces light modulating element 52 . The light combining prism 56 may be arranged near the light modulation element 52 . In this embodiment, the light combining prism 56 combines the images formed by the light modulation elements 52 . Specifically, the light synthesizing prism 56 may synthesize images respectively formed by a plurality of light modulating elements (here, three light modulating elements 52R, 52G and 52B). That is, the light synthesizing prism 56 color-synthesizes the respective color images formed by the light modulation elements 52R, 52G, and 52B into one image. A single image is formed by synthesizing the images by the photosynthesis prism 56 .

The image display device 50 further includes a projection lens 57. A projection lens 57 projects the image synthesized by the photosynthesis prism 56 onto a screen (not shown).

The image display device includes three holding portions 53R, 53G and 53B as the holding portion 53. In this embodiment, the holding portion 53 is housed in the housing 51 . The light modulation elements 52R, 52G and 52B are attached to holding portions 53R, 53G and 53B, respectively. Further, the image display device 50 according to the present embodiment includes two adjustment units 55R and 55G as the adjustment unit 55, as shown in FIG. The adjusters 55R and 55G adjust the positions of the light modulation elements 52R and 52G, respectively. Hereinafter, in this specification, when the three holding portions 53R, 53G and 53B are not distinguished, they are simply referred to as "holding portions 53". Moreover, when not distinguishing between the two adjustment units 55R and 55G, they are simply referred to as "adjustment unit 55".

The holding section 53R holds the light modulation element 52R displaceably in directions perpendicular to and parallel to the image forming surface of the light modulation element 52R. Here, the direction perpendicular to the image forming surface is the direction of the optical axis, and the direction parallel to the image forming surface is the direction perpendicular to the optical axis. The adjusting section 55R is configured so that the user of the image display device 50 can adjust the amount of displacement of the light modulation element 52R on the holding section 53R from the operation surface 51a.

Similarly to the holding portion 53R, the holding portion 53G holds the light modulation element 52G so as to be displaceable in directions perpendicular to and parallel to the image forming surface of the light modulation element 52G. The adjustment section 55G is configured so that the user of the image display device 50 can adjust the amount of displacement of the light modulation element 52G on the holding section 53G from the operation surface 51a.

FIG. 3 is a perspective view of the photosynthesis prism unit assembly 60 according to this embodiment. The light combining prism unit assembly 60 includes the light modulation element 52, the holding section 53, the wire member 54, and the light combining prism 56 described with reference to FIGS.

The photosynthesis prism unit assembly 60 includes three photosynthesis prism units. That is, the photosynthesis prism unit assembly 60 includes a first photosynthesis prism unit 21R, a second photosynthesis prism unit 21G, and a third photosynthesis prism unit 21B. Each photosynthesis prism unit is a unit for forming an image of a specific color light. That is, in this embodiment, the three photosynthesis prism units 21R, 21G, and 21B are units for forming a red image, a green image, and a blue image, respectively.

The first light synthesizing prism unit 21R includes the light modulation element 52R, the holding section 53R, and the adjustment section 55R described with reference to FIG. Similarly, the second light synthesizing prism unit 21G includes an optical modulation element 52G, a holding section 53G, and an adjustment section 55G. Similarly, the third light synthesizing prism unit 21B includes an optical modulation element 52B and a holding portion 53B.

As shown in FIG. 3, the first photosynthetic prism unit 21R includes a first electric substrate 9R. The second photosynthetic prism unit 21G includes a second electric board 9G. The third photosynthetic prism unit 21B includes a third electric board 9B. The first electric board 9R includes a circuit necessary for driving the light modulation element 52R, and is attached to the holding portion 53R. The second electric board 9G includes circuits necessary for driving the light modulation element 52G, and is attached to the holding portion 53G. The third electric board 9B includes circuits necessary for driving the light modulation element 52B, and is assembled to the holding portion 53B.

The adjuster 55R is composed of three first wire members 1Ra, 1Rb and 1Rc and four second wire members 2Ra, 2Rb, 2Rc and 2Rd shown in FIG. The first wire members 1Ra, 1Rb and 1Rc are used for pixel position adjustment by displacing the light modulation element 52R in a direction parallel to the image forming surface (direction perpendicular to the optical axis). The second wire members 2Ra, 2Rb, 2Rc, and 2Rd are used for focus adjustment by displacing the light modulation element 52R in a direction (optical axis direction) perpendicular to the image forming surface.

Similarly, as shown in FIG. 3, the adjustment section 55G is composed of three first wire members 1Ga, 1Gb and 1Gc and four second wire members 2Ga, 2Gb, 2Gc and 2Gd. The first wire members 1Ga, 1Gb and 1Gc are used for pixel position adjustment to displace the light modulation element 52G in a direction parallel to the image forming surface. The second wire members 2Ga, 2Gb, 2Gc and 2Gd are used for focus adjustment by displacing the light modulation element 52G in the direction perpendicular to the image forming surface.

The details of the method of pixel position adjustment and focus adjustment using the first wire member 1 and the second wire member 2 will be described later.

FIG. 4 is an exploded view showing an example of the configuration of the photosynthesis prism unit. Specifically, FIG. 4 is an example of an exploded view of the first photosynthesis prism unit 21R or the second photosynthesis prism unit 21G. The first photosynthesis prism unit 21R and the second photosynthesis prism unit 21G may be configured similarly. Here, the first photosynthesis prism unit 21R and the second photosynthesis prism unit 21G are referred to as "lightsynthesis prism unit 21".

Also, the first wire member 1Ra and the first wire member 1Ga are described as "first wire member 1a". Similarly, the first wire member 1Rb and the first wire member 1Gb are referred to as the "first wire member 1b", and the first wire member 1Rc and the first wire member 1Gc are referred to as the "first wire member 1c". Describe. Similarly, with respect to the second wire members, the second wire members 2Ra and 2Ga are referred to as "second wire members 2a," and the second wire members 2Rb and 2Gb are referred to as "second wire members." 2 wire member 2b”, the second wire member 2Rc and the second wire member 2Gc are described as the “second wire member 2c”, and the second wire member 2Rd and the second wire member 2Gd are described as the “second 2-wire member 2d”.

Furthermore, in this specification, when the first wire members 1a, 1b and 1c are not distinguished, they are simply referred to as "first wire member 1". Similarly, when the second wire members 2a, 2b, 2c and 2d are not distinguished, they are simply referred to as "second wire member 2".

Also, in this specification, when the first electric board 9R and the second electric board 9G are not distinguished from each other, they are simply referred to as the "electric board 9".

As shown in FIG. 4 , the photosynthesis prism unit 21 includes a fixed plate 4 , a first movable plate 6 and a second movable plate 7 as holding portions 53 . That is, the fixed plate 4 , the first movable plate 6 , and the second movable plate 7 are members forming the holding portion 53 . In particular, the first movable plate 6 and the second movable plate 7 are members that constitute the movable portion 53 a of the holding portion 53 .

In this embodiment, as shown in FIG. 4, the fixing plate 4 is composed of two members, a first member 4a and a second member 4b. In this specification, when the first member 4a and the second member 4b are not distinguished, they are simply referred to as "fixing plate 4".

The fixing plate 4 is housed inside the housing 51 . Specifically, the fixed plate 4 is fixed to the light combining prism 56 inside the housing 51 . Therefore, the fixed plate 4 is not relatively displaced with respect to the photosynthetic prism 56 .

In this embodiment, as shown in FIG. 4, the first movable plate 6 is composed of two members, a first member 6a and a second member 6b. In this specification, when the first member 6a and the second member 6b are not distinguished, they are simply referred to as "the first movable plate 6".

The first movable plate 6 is slidably connected to the fixed plate 4 . Specifically, the first movable plate 6 is connected to the fixed plate 4 so as to be slidable with respect to the fixed plate 4 in a direction parallel to the image forming surface. Therefore, the first movable plate 6 is relatively displaceable with respect to the fixed plate 4 . A specific method of connecting the fixed plate 4 and the first movable plate 6 will be described later.

In this embodiment, the first member 6 a of the first movable plate 6 is fixed to the first member 4 a of the fixed plate 4 . Also, the second member 6 b of the first movable plate 6 is fixed to the second member 4 b of the fixed plate 4 .

The second movable plate 7 holds the light modulation element 52 . In this embodiment, as shown in FIG. 4, an opening is formed in the center of the second movable plate 7 for attaching the light modulation element 52 . The light modulation element 52 is held by the second movable plate 7 by being attached to the opening.

The photosynthesis prism unit 21 includes a first wire member 1 and a second wire member 2 as wire members 54 .

One end of the first wire member 1 is connected to the fixed plate 4 . The other end of the first wire member 1 is configured to be rotatable. The other end of the first wire member 1 may be rotatably attached to the housing 51, for example. In this embodiment, the first wire members 1a and 1b are connected to the first member 4a of the fixed plate 4, and the first wire member 1c is connected to the second member 4b of the fixed plate 4, as shown in FIG. be done. The three first wire members 1 a , 1 b and 1 c are all connected to the fixed plate 4 in a direction perpendicular to the optical axis 5 . As shown in FIG. 4, the first wire members 1a and 1b and the first wire member 1c are connected to the fixed plate 4 from directions that cross each other. The first wire members 1a and 1b and the first wire member 1c may be coupled to the fixed plate 4, in particular from mutually orthogonal directions.

The first wire member 1 functions as a wire member 54 for pixel position adjustment. Specifically, the first wire member 1 can rotate to displace the first movable plate 6 in a direction parallel to the image forming surface. That is, when the user rotates the other end of the first wire member 1, the first movable plate 6 is displaced in a direction parallel to the image forming surface.

For example, the first movable plate 6 can be displaced in a first direction perpendicular to the optical axis 5 by rotating the other end of the first wire member 1a. For example, by rotating the other end of the first wire member 1c, the first movable plate 6 can be displaced in a second direction orthogonal to the optical axis 5 and orthogonal to the first direction. For example, by rotating the other end of the first wire member 1b, the first movable plate 6 can be displaced in the rotational direction with the direction of the optical axis 5 as the axial direction.

The image forming surface of the light modulation element 52 has a plurality of pixels arranged in a matrix, for example. For example, the first direction corresponds to the row direction of the pixel, and the second direction corresponds to the column direction of the pixel. By individually adjusting the amount of rotation of the first wire members 1a, 1b, and 1c, the light modulation element 52 can be displaced in the first direction, the second direction, and the rotation direction. A specific mechanism for displacing the first movable plate 6 by the first wire member 1 will be described later.

One end of the second wire member 2 is connected to the first movable plate 6 . In this embodiment, one end of the second wire member 2 is connected to the first movable plate 6 while passing through a through hole provided in the second movable plate 7 . That is, the second movable plate 7 is connected to the first movable plate 6 using the second wire member 2 . Four second wire members 2 a , 2 b , 2 c and 2 d are connected to the first movable plate 6 in a direction parallel to the optical axis 5 . As shown in FIG. 4 , the electric board 9 is arranged on the side opposite to the first movable plate 6 with respect to the second movable plate 7 . The other end of the second wire member 2 is configured to be rotatable. The other end of the second wire member 2 may be rotatably attached to the housing 51, for example.

The second wire member 2 functions as a wire member 54 for focus adjustment. Specifically, the second wire member 2 can rotate to displace the second movable plate 7 in a direction perpendicular to the image forming surface. That is, when the user rotates the other end of the second wire member 2, the second movable plate 7 is displaced in the direction perpendicular to the image forming surface. In this embodiment, by rotating the other ends of the second wire members 2a, 2b, 2c and 2d, the second movable plate 7 is displaced in the direction along the optical axis 5 (the direction perpendicular to the image forming surface). be able to. A specific mechanism for displacing the second movable plate 7 by the second wire member 2 will be described later.

Next, a specific mechanism for displacing the first movable plate 6 by the first wire member 1 will be described with reference to FIG. The first movable plate 6 can be displaced using the first wire member 1 connected to the fixed plate 4 . FIG. 5 is a partial perspective view showing how the first wire member 1 and the fixing plate 4 are connected. FIG. 5 is a perspective view of the photosynthesis prism unit 21 as seen from the fixing plate 4 side. In FIG. 5, the front side of the drawing is the side where the fixing plate 4 is arranged, and the back side of the drawing is the side where the electric board 9 is arranged.

The first movable plate 6 has three through holes, and one first wire member 1 is passed through each through hole. That is, a total of three first wire members 1 are passed through the first movable plate 6 . In this embodiment, the first member 6a of the first movable plate 6 has two through holes, and as shown in FIG. passes through the through-hole. In FIG. 5, only a part of the light combining prism unit 21 is shown, so only two first wire members 1a and 1b are shown in FIG. The photosynthesis prism unit 21 is further provided with one first wire member 1c. The first wire member 1c is provided so as to pass through the through-hole of the second member 6b of the first movable plate 6 from a direction intersecting (perpendicular to in this embodiment) the first wire members 1a and 1b. good. The connection mode of the first wire member 1c (not shown) is also the same as the connection mode described here with reference to FIG.

The through-hole of the first movable plate 6 is formed in a direction orthogonal to the optical axis 5 (that is, a direction parallel to the image forming surface). That is, the first wire member 1 is passed through the first movable plate 6 in a direction perpendicular to the optical axis 5 . One end of the first wire member 1 passing through the first movable plate 6 is connected to the fixed plate 4 .

A first contact member 11 is provided on the first wire member 1 . The first contact member 11 contacts the surface of the first movable plate 6 opposite to the fixed plate 4 side. The first contact member 11 may be fixed to the first wire member 1 . A first elastic member 10 is provided between the portion of the first movable plate 6 where the through hole is formed and the fixed plate 4 . The first elastic member 10 biases the first movable plate 6 toward the first contact member 11 . The first elastic member 10 can be configured by, for example, a coil spring. That is, one end of the first wire member 1 is connected to the fixed plate 4 , and the first wire member 1 includes a first elastic member 10 and a first elastic member 10 in order from one end along a direction orthogonal to the optical axis 5 . A movable plate 6 and a first contact member 11 are arranged.

The first movable plate 6 and the fixed plate 4 are biased away from each other by the elastic force of the first elastic member 10, and the first contact member 11 prevents the biased first movable plate 6 from being displaced. , the first movable plate 6 is held down. That is, the first contact member 11 limits the displacement of the first movable plate 6 in the direction orthogonal to the optical axis 5 .

A male screw 12 is formed on the outer surface of one end of the first wire member 1 . The fixing plate 4 has a first hole at a position where one end of the first wire member 1 is connected. For example, the fixed plate 4 has a first hole at a position facing the through hole of the first movable plate 6 . A female screw is formed on the inner surface of the first hole. Specifically, a female screw that meshes with the male screw 12 of the first wire member 1 is formed in the first hole of the fixing plate 4 . The first wire member 1 is connected to the fixing plate 4 by screwing the male screw 12 at one end into the female screw of the fixing plate 4 .

The other end of the first wire member 1 is rotatably attached to the operation surface 51a. In this embodiment, the other end of the first wire member 1 is rotated while the male thread 12 of the first wire member 1 is engaged with the female thread of the first hole of the fixing plate 4 (in a threaded state). By doing so, the first movable plate 6 can be displaced in the direction parallel to the image forming surface. For example, when the other end of the first wire member 1 is rotated clockwise, the thrust of the screw displaces the first movable plate 6 in a direction approaching the fixed plate 4 . For example, when the other end of the first wire member 1 is rotated counterclockwise, the elastic force of the first elastic member 10 displaces the first movable plate 6 away from the fixed plate 4 . By manipulating the other end of the first wire member 1 in this manner, the first movable plate 6 can be displaced in a direction perpendicular to the optical axis 5 (that is, in a direction parallel to the image forming surface). As the first movable plate 6 is displaced in the direction parallel to the image forming surface by the rotation of the first wire member 1, the second movable plate 7 connected to the first movable plate 6 is also displaced in the direction parallel to the image forming surface. Displace. As a result, the light modulation element 52 held by the second movable plate 7 is also displaced in the direction parallel to the image forming surface. Therefore, pixel position adjustment of the image can be performed.

FIG. 6 is a partial perspective view showing how the first movable plate 6 and the fixed plate 4 are connected. FIG. 7 is a cross-sectional view schematically showing how the first movable plate 6 and the fixed plate 4 are connected. Specifically, FIG. 7 is a cross-sectional view of a section through fixing screw 16 .

As shown in FIGS. 6 and 7, a metal plate 58 is adhered to the photosynthetic prism 56 . The fixed plate 4 is fixed to the metal plate 58 . The fixing plate 4 is fixed to the metal plate 58 by, for example, one or more fixing screws 13 (see FIG. 9). Therefore, the photosynthetic prism 56, the metal plate 58, and the fixed plate 4 are fixed to each other.

The first movable plate 6 is connected to the fixed plate 4 by a fixing screw 16. Specifically, the first movable plate 6 is provided with a fixing through hole 6c. The fixing plate 4 is provided with a fixing through hole 4c. The metal plate 58 is provided with bottomed fixing holes 58a. A female screw that engages with a male screw formed on the outer surface of the tip of the fixing screw 16 is formed on the inner surface of the fixing bottomed hole 58 a of the metal plate 58 . Moreover, both the inner diameter of the fixing through-hole 6c of the first movable plate 6 and the inner diameter of the fixing through-hole 4c of the fixing plate 4 are larger than the outer diameters of the barrel and threaded portion of the fixing screw 16 .

The first movable plate 6 is connected to the fixed plate 4 by passing the fixing screws 16 through the fixing through holes 4c. Specifically, in the first movable plate 6 , the fixing screw 16 is passed through the fixing through hole 6 c of the first movable plate 6 and the fixing through hole 4 c of the fixing plate 4 , and the fixing screw 16 is inserted into the metal plate 58 . It is connected to the fixed plate 4 by screwing into the . That is, when the fixing screw 16 is screwed into the metal plate 58 , the fixing screw 16 is passed through the fixing through-hole 6 c of the first movable plate 6 , so that the first movable plate 6 is attached to the head of the fixing screw 16 . and the fixed plate 4. In other words, the first movable plate 6 is fastened together with the fixed plate 4 by the fixing screws 16 . The first movable plate 6 is thereby connected to the fixed plate 4 . At this time, a screw locking agent may be applied to the tip of the fixing screw 16, that is, the portion where the male thread is formed. A constant tightening torque of the fixing screw 16 can be maintained by the thread locking agent. The fixing screw 16 is screwed into the metal plate 58 with a tightening torque that allows the first movable plate 6 to slide relative to the fixing plate 4 in the direction parallel to the image forming surface. As a result, the first movable plate 6 can be displaced in the direction parallel to the image forming surface without being displaced in the direction in which the fixing screw 16 is inserted into the metal plate 58 (that is, in the direction perpendicular to the image forming surface).

The first movable plate 6 can be displaced in a direction parallel to the image forming surface within a range in which the inner wall of the fixing through-hole 4c and the body of the fixing screw 16 do not contact each other. Here, as shown in FIG. 7, the inner diameter of the fixing through-hole 4c of the first movable plate 6 is Di, and the outer diameter of the body of the fixing screw 16 is Do. Since the inner diameter Di of the fixing through-hole 4c is larger than the outer diameter Do of the barrel portion of the fixing screw 16, Di>Do. In the direction along the cross section shown in FIG. 7, the first movable plate 6 can slide in the direction parallel to the image forming surface with respect to the fixed plate 4 at the difference between the inner diameter Di and the outer diameter Do. . In other words, in the direction along the cross section shown in FIG. 7, the difference (Di-Do) between the inner diameter Di and the outer diameter Do is the movable distance of the first movable plate 6 .

The movable distance may be determined as appropriate. For example, it is preferable that the movable distance is set to ±10 pixels or more in pixels of the light modulation element 52 . For example, when the pixel pitch of the light modulation element 52 is 7.5 μm, the movable distance is preferably ±75 μm or more.

It should be noted that one or more washers may be arranged between the head of the fixing screw 16 and the first movable plate 6 when screwing the fixing screw 16 to the metal plate 58 . In the example shown in FIG. 7, four washers, ie, a first washer 59a, a second washer 59b, a third washer 59c and a fourth washer 59d are provided between the head of the fixing screw 16 and the first movable plate 6. are placed.

Next, a specific mechanism for displacing the second movable plate 7 by the second wire member 2 will be described with reference to FIG. The second movable plate 7 can be displaced using the second wire member 2 connected to the first movable plate 6 . FIG. 8 is a partial perspective view showing how the second wire member 2 and the first movable plate 6 are connected. FIG. 8 is a perspective view of the second wire member 2 in which one end connected to the first movable plate 6 is shown below and the other end attached to the operation surface 51a is shown above. Specifically, FIG. 8 is a perspective view of the photosynthesis prism unit 21 viewed from one end of the second wire member 2 .

The second movable plate 7 has four through holes, and one second wire member 2 is passed through each through hole. That is, a total of four second wire members 2 are passed through the second movable plate 7 . The through hole of the second movable plate 7 is formed in a direction parallel to the optical axis 5 (that is, a direction perpendicular to the image forming surface). That is, the first wire member 1 is passed through the first movable plate 6 in a direction perpendicular to the optical axis 5 . One end of the second wire member 2 passing through the second movable plate 7 is connected to the first movable plate 6 .

8 shows only a part of the photosynthesis prism unit 21, only one second wire member 2 is shown in FIG. In addition to the one second wire member 2 shown in FIG. 8, the photosynthesis prism unit 21 includes three second wire members 2 arranged in the same direction as the illustrated second wire member 2. is provided. The connection mode of the three second wire members 2 (not shown) is the same as the connection mode described here with reference to FIG. 8 .

A second contact member 14 is provided on the second wire member 2 . The second contact member 14 contacts the surface of the second movable plate 7 opposite to the first movable plate 6 side. The second contact member 14 may be fixed to the second wire member 2 . A second elastic member 8 is provided between the portion of the second movable plate 7 where the through hole is formed and the first movable plate 6 . The second elastic member 8 biases the second movable plate 7 toward the second contact member 14 side. The second elastic member 8 can be composed of, for example, a coil spring. That is, one end of the second wire member 2 is connected to the first movable plate 6, and along the direction of the optical axis 5, the second wire member 2 is provided with a second elastic member 8 and a second elastic member 8 in order from one end side. A movable plate 7 and a second contact member 14 are arranged.

The second movable plate 7 and the first movable plate 6 are biased away from each other by the elastic force of the second elastic member 8, and the second abutment member 14 causes the biased second movable plate 7 to The second movable plate 7 is restrained so as not to be displaced. That is, the second contact member 14 limits displacement of the second movable plate 7 in the direction of the optical axis 5 .

A male screw 15 is formed on the outer surface of one end of the second wire member 2 . The first movable plate 6 has a second hole at a position where one end of the second wire member 2 is connected. For example, the first movable plate 6 has a second hole at a position facing the through hole of the second movable plate 7 . A female screw is formed on the inner surface of the second hole. Specifically, a female screw that meshes with the male screw 15 of the second wire member 2 is formed in the second hole of the first movable plate 6 . The second wire member 2 is connected to the first movable plate 6 by screwing the male screw 15 at one end into the female screw of the first movable plate 6 .

The other end of the second wire member 2 is rotatably attached to the operation surface 51a. In this embodiment, the male screw 15 of the second wire member 2 is engaged with the female screw of the second hole of the first movable plate 6 (in a screwed state), and the other end of the second wire member 2 is By rotating , the second movable plate 7 can be displaced in a direction perpendicular to the image forming surface. For example, when the other end of the second wire member 2 is rotated clockwise, the thrust of the screw displaces the second movable plate 7 in a direction approaching the first movable plate 6 . For example, when the other end of the second wire member 2 is rotated counterclockwise, the elastic force of the second elastic member 8 displaces the second movable plate 7 away from the first movable plate 6 . By manipulating the other end of the second wire member 2 in this manner, the second movable plate 7 can be displaced in a direction parallel to the optical axis 5 (that is, a direction perpendicular to the image forming surface). Thereby, focus adjustment of the image can be performed.

FIG. 9 is a partial perspective view showing how the fixed plate 4, the first movable plate 6 and the second movable plate 7 are connected. FIG. 9 is a perspective view of the second wire member 2 in which one end connected to the first movable plate 6 is shown on the bottom side, and the other end side attached to the operation surface 51a is shown on the top side. Specifically, FIG. 9 is a perspective view of the photosynthesis prism unit 21 as seen from the other end side of the second wire member 2 .

As described above, the fixed plate 4 is fixed to the photosynthetic prism 56 . Specifically, the fixed plate 4 is fixed to a metal plate 58 adhered to the photosynthetic prism 56 . The first movable plate 6 is slidably connected to the fixed plate 4 with a fixing screw 16 . A first wire member 1 passing through a through hole of a first movable plate 6 is connected to the fixed plate 4 in a direction orthogonal to the optical axis 5 . A second wire member 2 passing through a through hole of a second movable plate 7 is connected to the first movable plate 6 in a direction parallel to the optical axis 5 . The second movable plate 7 holds the light modulation element 52 . The second movable plate 7 is not adhered to the fixed plate 4 and the first movable plate 6 . Therefore, the positional relationship between the light modulation element 52 and the fixed plate 4 and the first movable plate 6 is fixed without using an adhesive.

In the pixel position adjustment, the user can rotate the other end of the first wire member 1 on the operation surface 51a clockwise or counterclockwise to adjust the relative pixel position deviation between the images of each color. In the photosynthesis prism unit 21 according to this embodiment, it is possible to adjust the displacement of the pixel positions of the red image and the green image with respect to the blue image.

For example, when adjusting the displacement of the pixel position of the red image, by rotating the other end of the first wire members 1Ra, 1Rb and 1Rc (for example, the first wire member 1 shown in FIG. 9) of the adjusting section 55R, 1 Displace the first movable plate 6 of the light combining prism unit 21R in a direction parallel to the image forming surface. By displacing the first movable plate 6 of the first photosynthetic prism unit 21R, the second movable plate 7 connected to the first movable plate 6 is displaced together with the first movable plate 6, whereby the second movable plate 7 is displaced in the direction parallel to the image forming surface, positional deviation of pixels in the row direction, column direction and rotation direction can be adjusted. Note that the column direction and row direction of the pixels may correspond to the other direction and the horizontal direction on the projected screen, respectively. The displacement of the pixel position of the green image can also be adjusted in the same manner.

In focus adjustment, the user can rotate the other end of the second wire member 2 on the operation surface 51a clockwise or counterclockwise to adjust the positional deviation (focus) between the images of each color in the optical axis direction. . In the photosynthesis prism unit 21 according to the present embodiment, it is possible to adjust the positional deviation of the red image and the green image in the optical axis direction with respect to the blue image.

For example, when adjusting the positional deviation of the red image in the optical axis direction, the other ends of the second wire members 2Ra, 2Rb, 2Rc, and 2Rd (for example, the second wire member 2 shown in FIG. 9) of the adjusting portion 55R are rotated. Thus, the second movable plate 7 of the first photosynthetic prism unit 21R is displaced in the direction perpendicular to the image forming surface. As a result, the light modulation element 52R held by the second movable plate 7 is displaced in the direction perpendicular to the image forming surface, so that positional deviation in the optical axis direction can be adjusted. The positional deviation of the green image in the optical axis direction can also be adjusted in the same manner.

According to the configuration of the image display device 50 according to the present embodiment, when the user rotates the second wire member 2 for focus adjustment, the second movable plate 7 is positioned perpendicular to the image forming surface. direction, but the first movable plate 6 is not displaced. Therefore, in the image display device 50, even if focus adjustment is performed, the pixel position does not move. That is, focus adjustment can be performed independently of pixel position adjustment.

As a method of adjusting the light modulation element using the image display device 50 according to the present embodiment, the user first rotates the first wire member 1 so that the first movable plate 6 rotates in a direction parallel to the image forming surface. After positioning, it is preferable to position the second movable plate 7 in the direction perpendicular to the image forming surface by rotating the second wire member 2 . That is, it is preferable to first displace the first movable plate 6 to adjust the displacement of the pixel position, and then displace the second movable plate 7 to adjust the displacement in the optical axis direction. If the positional deviation in the optical axis direction is adjusted first, and then the pixel positional deviation is adjusted, the positional deviation in the optical axis direction occurs again in the process of adjusting the pixel positional deviation. This is because there is a possibility that it may become necessary to adjust the positional deviation of the .

As described above, in the image display device 50 of the present embodiment, the second movable plate 7 holding the light modulation element 52 is fixed without being adhered to the fixed plate 4 and the first movable plate 6 . Therefore, the image display device 50 can fix the positional relationship between the photosynthesis prism 56 and the light modulation element 52 without adhesive. As a result, the production efficiency of the image display device 50 can be improved, and the production cost can be reduced.

In addition, the image display device 50 can adjust the position of the light modulation element 52 from the outside of the image display device 50 . Specifically, the image display device 50 operates the other end of the first wire member 1 and the second wire member 2 attached to the operation surface 51a, thereby causing the light modulation element 52 to move parallel to the image forming surface. Directional and vertical position adjustments can be made. Accordingly, the image display device 50 can adjust the pixel position without dismantling the device.

As described above, in the image display device 50 according to the present embodiment, the portion that was conventionally fixed by adhesion is replaced with a mechanism for adjusting the focus, thereby enabling the light combining prism 56 and the light modulation element 52 to be connected without adhesion. While fixing the positional relationship, the position adjustment of the light modulation element 52, especially the focus adjustment can be performed.

Note that the image display device 50 of the present embodiment is an example of the present disclosure, and its configuration can be changed as appropriate. For example, the image display device 50 may further include, as the adjusting section 55, an adjusting section 55B that adjusts the position of the light modulation element 52B that forms the blue image. In this case, the adjustment section 55B may have the same configuration as the adjustment sections 55R and 55G described above.

In the present embodiment, the numbers of the first wire members 1 and the second wire members 2 included in the photosynthesis prism unit 21 were described as three and four, respectively. is not limited to this. The photosynthesis prism unit 21 may include at least one first wire member and at least one second wire member.

The image display device 50 disclosed in the present specification can be applied to general display devices including light modulation elements.

1, 1Ra, 1Rb, 1Rc, 1Ga, 1Gb, 1Gc First wire member 2, 2Ra, 2Rb, 2Rc, 2Rd, 2Ga, 2Gb, 2Gc, 2Gd Second wire member 4 Fixing plate 4a, 6a First member 4b, 6b Second member 4c, 6c Fixing through hole 5 Optical axis 6 First movable plate 7 Second movable plate 8 Second elastic member 9 Electric substrate 9R First electric substrate 9G Second electric substrate 9B Third electric substrate 10 First elastic Member 11 First contact member 12, 15 Male screw 13, 16 Fixing screw 14 Second contact member 21 Light combining prism unit 21R First light combining prism unit 21G Second light combining prism unit 21B Third light combining prism unit 50 Image display device 51 Housing 51a Operation surface 52, 52R, 52G, 52B Light modulation element 52a Image forming surface 53, 53R, 53G, 53B Holding part 53a Movable part 54 Wire member 54a One end 54b Other end 55, 55R, 55G Adjusting part 56 Light combining prism 57 Projection lens 58 Metal plate 58a Bottomed fixing hole 59a First washer 59b Second washer 59c Third washer 59d Fourth washer 60 Photosynthetic prism unit assembly Di Inside diameter Do Outside diameter

Claims (11)

a light modulating element having an image forming surface that modulates light to form an image;
a prism facing the light modulating element;
a fixed plate fixed to the prism;
a first movable plate slidably connected to the fixed plate in a direction parallel to the image forming surface;
a first wire member having one end connected to the fixed plate, the other end being rotatable, and capable of displacing the first movable plate in a direction parallel to the image forming surface by rotation;
a second movable plate holding the light modulation element;
a second wire member having one end connected to the first movable plate, the other end being rotatable, and capable of displacing the second movable plate in a direction perpendicular to the image forming surface by rotation;
An image display device. The second movable plate is connected to the first movable plate using the second wire member,
By rotating the first wire member, the first movable plate is displaced in a direction parallel to the image forming surface, whereby the light modulation element held by the second movable plate connected to the first movable plate is displaced. , displaced in a direction parallel to the imaging surface;
The image display device according to claim 1. a first contact member provided on the first wire member and brought into contact with a surface of the first movable plate opposite to the fixed plate;
a first elastic member that biases the first movable plate against the first contact member;
The image display device according to claim 1 or 2, further comprising: The first wire member has a male thread formed on the outer surface of the one end of the first wire member,
The fixing plate has a first hole having a female screw formed on the inner surface at a position where the one end of the first wire member is connected,
By rotating the other end of the first wire member in a state where the male screw of the first wire member is engaged with the female screw of the first hole, the first movable plate performs the image forming operation. 4. The image display device according to any one of claims 1 to 3, displaced in a direction parallel to the plane. a second contact member provided on the second wire member and in contact with a surface of the second movable plate opposite to the first movable plate;
a second elastic member that biases the second movable plate against the second contact member;
The image display device according to any one of claims 1 to 4, further comprising: a male screw is formed on the outer surface of the one end of the second wire member,
The first movable plate has a second hole having a female screw formed on the inner surface at a position connecting the one end of the second wire member,
By rotating the other end of the second wire member in a state where the male screw of the second wire member is engaged with the female screw of the second hole, the second movable plate performs the image forming operation. 6. The image display device according to any one of claims 1 to 5, displaced in a direction perpendicular to the plane. The image display device according to any one of claims 1 to 6, wherein the first movable plate is slidably connected to the fixed plate by a fixing screw. The first movable plate has a fixing through hole, and is connected to the fixed plate by passing the fixing screw through the fixing through hole,
The inner diameter of the fixing through-hole is larger than the outer diameter of the body of the fixing screw,
The first movable plate can be displaced in a direction parallel to the image forming surface within a range in which the inner wall of the fixing through-hole and the body portion of the fixing screw do not come into contact with each other.
The image display device according to claim 7. The image display device according to any one of claims 1 to 8, wherein said second movable plate is not adhered to said fixed plate and said first movable plate. Further equipped with a housing,
The fixed plate is fixed to the housing,
The other end of the first wire member and the other end of the second wire member are attached to the housing,
The image display device according to any one of claims 1 to 9. a light modulating element having an image forming surface that modulates light to form an image;
a prism facing the light modulating element;
a fixed plate fixed to the prism;
a first movable plate slidably connected to the fixed plate in a direction parallel to the image forming surface;
a first wire member having one end connected to the fixed plate, the other end being rotatable, and capable of displacing the first movable plate in a direction parallel to the image forming surface by rotation;
a second movable plate holding the light modulation element;
a second wire member having one end connected to the first movable plate, the other end being rotatable, and capable of displacing the second movable plate in a direction perpendicular to the image forming surface by rotation;
In an image display device comprising
By rotating the first wire member, the first movable plate is positioned in the direction parallel to the image forming surface, and then by rotating the second wire member, the second movable plate is positioned in the direction parallel to the image forming surface. perform positioning in the direction perpendicular to the image forming surface,
A method for adjusting an image display device.

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