JP5629996B2 - Stereoscopic optical device and imaging optical device - Google Patents

Description

  The present invention relates to a stereoscopic optical device that enables stereoscopic display of an image, and an optical device.

  2. Description of the Related Art Conventionally, as a stereoscopic optical device, for example, a device that obtains a stereoscopic effect by an observer by displaying left and right parallax images on a display surface such as a head mounted display is known. For example, Patent Document 1 introduces a technique in which a plurality of display surfaces are provided in the depth direction, which is the observer's observation direction, and different images are displayed.

JP 2000-333211 A

  However, when a plurality of display surfaces are provided in the observation direction, different aberrations occur for each display surface due to a lens installed between the viewer and the viewer to observe these display surfaces. If the aberration generated on each display surface is different, there is a problem that the observer cannot observe the displayed image satisfactorily depending on how the aberration appears.

そして、本発明においては、複数の表示面のうちの一つの表示面が、レンズ群について無限遠方と共役関係にあることが好ましい。 In order to solve the above-described problems, the stereoscopic optical device of the present invention is a stereoscopic optical device including a plurality of display surfaces in an observer's observation direction and a lens group between the plurality of display surfaces and the observer. In the lens group, when the angle formed by the optical axis of the incident principal ray on the observer side is θ and the focal length of the lens group is f, the height y of the image plane on the one display surface is as follows: It is characterized by satisfying the formula.

In the present invention, it is preferable that one display surface of the plurality of display surfaces is in a conjugate relationship with the lens group at infinity.

  In order to solve the above problems, an optical device of the present invention is an optical device having a lens group that forms an image with respect to different object distances, and the lens group has an angle formed by the optical axis of an incident principal ray as θ, When the focal length of the lens group is f, the height y on the image plane of the object at infinity satisfies the same conditional expression as the above conditional expression, so that the image plane on each imaging plane corresponding to a different object distance. It is characterized by suppressing the occurrence of bending.

It is the schematic showing the observation state of the stereoscopic vision optical apparatus in this embodiment. It is the conceptual diagram which has arrange | positioned the optical system of FIG. 1 with respect to each of the right and left eyeball. 3 is an explanatory diagram for explaining an optical relationship of the lens group 10. FIG. 6 is a diagram illustrating a configuration of a lens group of Comparative Example 1. FIG. It is a figure which shows the aberration curve of the object distance of the comparative example 1 infinitely far. It is a figure which shows the spot diagram of the object distance of the comparative example 1 infinitely far. It is a figure which shows the aberration curve whose object distance of the comparative example 1 is a finite distance. It is a figure which shows the spot diagram whose object distance of the comparative example 1 is a finite distance. It is a figure which shows the spot diagram whose object distance of the comparative example 1 is a finite distance. 2 is a diagram illustrating a configuration of a lens group of Example 1. FIG. It is a figure which shows the aberration curve of the object distance of Example 1 infinitely far. It is a figure which shows the spot diagram of the object distance of Example 1 infinitely far. It is a figure which shows the aberration curve whose object distance of Example 1 is a finite distance. It is a figure which shows the spot diagram whose object distance of Example 1 is a finite distance. It is a figure which shows the spot diagram when parallel plane glass is put when the object distance of Example 1 is infinitely far. 6 is a diagram illustrating a configuration of a lens group of Comparative Example 2. FIG. It is a figure which shows the aberration curve of the object distance of the comparative example 2 infinitely far. It is a figure which shows the spot diagram of the object distance of the comparative example 2 infinitely far. It is a figure which shows the aberration curve whose object distance of the comparative example 2 is a finite distance. It is a figure which shows the spot diagram whose object distance of the comparative example 2 is a finite distance. FIG. 4 is a diagram illustrating a configuration of a lens group of Example 2. It is a figure which shows the aberration curve of the object distance of Example 2 infinitely far. It is a figure which shows the spot diagram of the object distance of Example 2 infinitely far. It is a figure which shows the aberration curve whose object distance of Example 2 is a finite distance. It is a figure which shows the spot diagram whose object distance of Example 2 is a finite distance.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a schematic diagram illustrating an observation state of the stereoscopic optical device according to the present embodiment. The stereoscopic optical device includes a lens group 10 as an eyepiece, a display plate 11 for finite distance, and a display for infinite distance from the viewer 1 side along an optical axis 2 parallel to the viewing direction of the viewer 1. A plate 12 is provided. In the figure, the lens group 10 is expressed as a single lens, but in reality it is a lens group composed of a plurality of lenses.

  In addition, here, the display board is represented by two sheets of the display board 11 for a finite distance and the display board 12 for an infinite distance, but the number may be further increased. Each of the plurality of display boards is a display arranged on the optical axis 2 and can be configured using a translucent display other than the innermost display. Alternatively, a plurality of projections on the optical axis 2 in which the respective images projected from a plurality of displays arranged on the outside of the optical axis 2 are reflected and projected by the partial reflecting mirrors arranged on the optical axis 2 It can also be configured as a surface.

  The stereoscopic optical device generates the finite distance image 15 as a display image of the finite distance display plate 11 via the lens group 10. Similarly, an infinite distance image is generated as a display image of the display plate 12 for infinite distance. In this way, different distance images are respectively displayed on the display plates arranged at different positions with respect to the observation direction, so that the observer can perform observation with little discomfort accompanied by focus adjustment of the eyeball. In the description of the embodiment, the display plate 12 shown in FIG. 1 is used for an infinite distance. However, as the stereoscopic optical device according to the present invention, a plurality of display plates may be at a finite distance. The distance display plate 12 is not necessarily limited to infinity display.

  FIG. 2 is a conceptual diagram in which the optical system of FIG. 1 is arranged for each of the left and right eyeballs. A right eye lens group 30, a right eye finite distance display board 31, and a right eye infinite distance display board 32 are provided for the right eye 3 of the observer. Similarly, a left eye lens group 40, a left eye finite distance display plate 41, and a left eye infinite distance display plate 42 are provided for the left eye 4 of the observer.

  With this configuration, different images are observed with the right eye 3 and the left eye 4. Then, by coordinating and displaying an image considering parallax on a display board corresponding to the observation direction, for example, the display board 31 for the right eye finite distance and the display board 41 for the left eye finite distance, the observer can Therefore, it is possible to perform natural stereoscopic vision with less sense of discomfort in terms of eye focus.

  Next, the optical relationship of the lens group 10 will be described. FIG. 3 is an explanatory diagram for explaining the optical relationship of the lens group 10.

  In general, aberration occurs when the object distance changes. That is, even if the image on the display plate 11 for finite distance has no aberration, the image on the display plate 12 for infinite distance does not have no aberration. On the other hand, even if there is no aberration for the display plate 12 for infinite distance, aberration occurs in the image of the display plate 11 for finite distance. Since an optical system for a stereoscopic optical device generally has a large F number (dark) of a lens, the generated aberration is greatly affected by field curvature. Therefore, it is sufficient to reduce the influence of the field curvature. Further, as is clear from FIG. 1, in order that the aperture of the lens is not so large and the distance between the eyeball of the observer and the lens group 10 is sufficient, the principal ray on the display panel side is the optical axis 2. Telecentric that is parallel to In particular, if the display panel is telecentric, the size of the image does not change even if the image plane moves back and forth. Therefore, when a plurality of display boards are inserted, image processing for images displayed on the respective display boards, etc. It is also advantageous from the viewpoint.

FIG. 3 is an optical path diagram for explaining the lens group projection method, which is the basic configuration of the present invention. It is shown that light travels from the left side (designed object side) to the right side (designed image side) as in the normal method of optical design. In FIG. 3, when the focal length of the lens group 10 is f, the front focal plane 101 is located at a position f away from the main plane 100 on the object side, and the rear focal plane 102 is located at a position f away from the image side. Exists. Here, consider the case of telecentricity. That is, by providing a stop on the left focal plane 101, the imaging principal ray becomes parallel to the optical axis on the right side of the lens group 10, and a so-called image side telecentric optical system is configured. An image at infinity is created on the rear focal plane 102. That is, the rear focal plane 102 is in a conjugate relationship with infinity. Then, as shown in the figure, consider a case where the object position is at a position L ₀ away from the front focal point. In the actual positional relationship of the stereoscopic optical device, as described with reference to FIG. 1, the object exists as an object distance image on the side opposite to the observer 1 with respect to the lens group 10, that is, on the right side in FIG. Here, for simplification of description, description is made on the left side so as to be equivalent.

  An object point 110 on the object plane 103 and outside the optical axis 2 forms an image at an image point 111. An object point 120 on the optical axis 2 on the object plane 103 forms an image at an image point 121 on the optical axis 2. The image point 121 exists on the object image plane 104. That is, the object plane 103 and the object image plane 104 have a conjugate relationship. In addition, the distance between the rear focal plane 102 and the object image plane 104 at this time is x ′.

（１）
と置く。ここで、ｙは後側焦点面１０２における像の高さであり、θは物体側での光軸２に対する主光線のなす角である。また、ｇは射影関係を表す関数である。 Here, even if the object moves in the optical axis direction, the Petzval sum, which is a unique value of the lens group 10, does not change. Therefore, if the occurrence of meridional field curvature is suppressed, sagittal field curvature should be reduced. is there. Now, the projection relationship of the lens group 10 is

(1)
Put it. Here, y is the height of the image on the rear focal plane 102, and θ is the angle formed by the principal ray with respect to the optical axis 2 on the object side. Further, g is a function representing the projection relationship.

（２）
となる。さらに、図３における幾何関係から、

（３）
である。ここで、ａは絞りの半径である。物体が光軸方向に移動しても像面湾曲が発生しないということは、物体移動による近軸像点位置の移動と軸外でのメリジョナル像点の移動が一致すれば良い。より具体的には、物体面１０３の光軸２外の物点１１０に対する像点１１１が、物体面１０３の光軸２上の物点１２０に対する像点１２１が存在する平面である物体像面１０４上に存在すれば良い。 Differentiating both sides of equation (1),

(2)
It becomes. Furthermore, from the geometric relationship in FIG.

(3)
It is. Here, a is the radius of the stop. The fact that the field curvature does not occur even when the object moves in the optical axis direction means that the movement of the paraxial image point position due to the object movement coincides with the movement of the memorial image point off the axis. More specifically, the object image plane 104 in which the image point 111 for the object point 110 outside the optical axis 2 on the object plane 103 is a plane on which the image point 121 for the object point 120 on the optical axis 2 on the object plane 103 exists. It only has to exist above.

（４）
が成立する。一方、像点１１１が物体像面１０４上に存在すると仮定すれば、像面での光線の開き角をα、主光線がΔθ傾いたときの像高の変化をΔｙとして、

（５）
が成り立つ。ここで、メリジョナル像点は非常に細い光束を考えているのでtanα≒sinαとし、式（５）を変形して、

（６）
となる。また、ヘルムホルツ・ラグランジュに対応する関係から、より厳密にはストローベルの定理をメリジョナル面内に適用して、

（７）
の関係があるので、式（２）から式（７）を用いて関数ｇを求めることができる。 In general, the image plane movement x ′ on the optical axis 2 is obtained from Newton's formula.

(4)
Is established. On the other hand, if it is assumed that the image point 111 exists on the object image plane 104, the opening angle of the ray on the image plane is α, and the change in the image height when the chief ray is inclined by Δθ is Δy.

(5)
Holds. Here, since the meridional image point considers a very thin light beam, tan α≈sin α is set, and the equation (5) is modified,

(6)
It becomes. Also, from the relationship corresponding to Helmholtz Lagrange, more strictly, the Strobel theorem is applied in the meridian plane,

(7)
Therefore, the function g can be obtained using the equations (2) to (7).

（８）
となる。式（８）を式（６）に代入して、

（９）
となり、さらに式（２）（４）を式（９）に代入して、

（１０）
となる。さらに式（３）を式（１０）に代入して、

（１１）
となり、式（１１）を積分して

（１２）
となる。ここで、Ｆは第一種楕円積分である。 First, from equation (7):

(8)
It becomes. Substituting equation (8) into equation (6),

(9)
Further, substituting equations (2) and (4) into equation (9),

(10)
It becomes. Furthermore, substituting equation (3) into equation (10),

(11)
And integrating equation (11)

(12)
It becomes. Here, F is the first kind elliptic integral.

（１３）
よって、

（１４）
となる。 In order to understand the solution of Equation (12) in an easy-to-understand manner, when applying an approximate equation to Equation (11),

(13)
Therefore,

(14)
It becomes.

  From the above, the function g was obtained as the equation (12), and the result represented approximately by the equation (14) was obtained. That is, if the lens group 10 is designed so as to have a projection relationship obtained by substituting such a function g into the equation (1), an optical system free from curvature of field in any plane on the image side is realized. be able to.

（１５）
となる。同様に、一般的なフーリエ変換レンズ（ｆsinθレンズ）では、関数ｇは、

（１６）
となる。さらに、一般的なｆθレンズでは、関数ｇは、

（１７）
となる。式（１５）から式（１６）と式（１４）を比較すると、本実施形態におけるレンズ群１０の射影関係は、ｆtanθレンズの射影関係と、ｆθレンズの射影関係の間の射影関係であると言える。およそこの範囲であれば、像側のいずれの平面においても像面湾曲の極めて少ない光学系を実現することができる。 Next, the relationship between the optical systems having such a projection relationship will be considered. For a general ftanθ lens, the function g is

(15)
It becomes. Similarly, in a general Fourier transform lens (fsin θ lens), the function g is

(16)
It becomes. Furthermore, in a general fθ lens, the function g is

(17)
It becomes. Comparing equation (15) to equation (16) with equation (14), the projection relationship of the lens group 10 in this embodiment is a projection relationship between the projection relationship of the ftanθ lens and the projection relationship of the fθ lens. I can say that. Within this range, it is possible to realize an optical system with extremely little field curvature in any plane on the image side.

Here, a relationship with the stereoscopic optical device in the present embodiment will be described.
The stereoscopic optical device is designed to be used so that the eyeball of the observer 1 exists at the front focal point that is the intersection of the front focal plane 101 and the optical axis 2. At this time, the display plate 12 for infinite distance is disposed so as to coincide with the rear focal plane 102. As shown in FIG. 1, when the object plane 103 having a finite distance exists on the right side of the lens group 10, that is, when the object plane 103 is similar to the configuration of the actual stereoscopic optical device, the object image plane 104 is the main plane. 100 and the rear focal plane 102. Therefore, the display plate 11 for finite distance is disposed between the lens group 10 and the display plate 12 for infinite distance.

  In the stereoscopic optical device configured as described above, since the curvature of field is extremely small, an image displayed on the display plate 11 for finite distance and an image displayed on the display plate 12 for infinite distance are both The image is observed as an in-focus image from the center of the optical axis to the periphery. Further, in the case of telecentricity, it is possible to further insert a display board 11 for a finite distance without worrying about image magnification, focus adjustment, and the like.

  In the optical design in the present embodiment in which the curvature of field is minimized, it may be difficult to correct distortion. That is, a relatively large distortion may remain. However, since the observation target of the observer is a display image, the display image to be displayed so as to cancel the distortion may be corrected in advance by image processing. Specifically, the image to be displayed may be processed into a tall shape. The tall-type image processing is processing for replacing the original image with the image data in the peripheral portion so as to shrink toward the center. When processed in this way, the processed image is no longer rectangular, but if necessary, it may be trimmed into a rectangle and displayed on the display board.

Next, a specific example and an example of optical design of the lens group 10 will be described.
(Comparative Example 1)
First, as a comparative example for showing the effect of an embodiment described later, an example in which distortion is removed instead of curvature of field will be shown. FIG. 4 is a diagram illustrating the configuration of the lens group of Comparative Example 1. In this example, the projection relationship is approximately ftanθ. Moreover, it is almost telecentric on the exit side.

  The lens group includes, in order from the object side, a positive meniscus lens L41 having a convex surface facing the image side, a cemented lens of a biconcave negative lens L42 and a biconvex positive lens L43, and a biconvex positive lens L44. A cemented lens composed of a positive meniscus lens L45 having a convex surface facing the object side and a positive meniscus lens L46 having a convex surface facing the object side, and a plano-concave lens L47 having a concave surface facing the object side.

  Table 1 below lists values of specifications of the lens group according to Comparative Example 1. In [Overall specifications], f represents a focal length, FNO represents an F number, and 2ω represents an angle of view (unit: “°”).

  In [Lens data], the surface represents the order of the lens surfaces from the object side, r represents the radius of curvature of the lens surfaces, and d represents the distance between the lens surfaces. Further, nd represents the refractive index with respect to the d line (λ = 587.6 nm), and νd represents the Abbe number with respect to the d line. The curvature radius r = 0.0000 indicates a plane, and the refractive index nd = 1.0000 of air is omitted from the description.

  Here, the unit of the focal length f, the radius of curvature r, and other lengths listed in all the following specification tables is generally “mm”. However, the optical system is not limited to this because the same optical performance can be obtained even when proportionally enlarged or reduced.

In addition, the same code | symbol as this comparative example 1 is used also in the following comparative example and the item value of an Example.

  According to FIG. 3, an object at infinity is created on the image side focal plane. In the stereoscopic optical device, an image of the infinite distance display plate 12 placed on the image-side focal plane is created at infinity, and the observer 1 observes it.

  FIG. 5 is a diagram showing an aberration curve of the comparative example 1 where the object distance is infinity, and FIG. 6 is a diagram showing a spot diagram of the comparative example 1 where the object distance is infinity. In FIG. 5, the left figure is a field curvature diagram, the solid line shows the sagittal image plane, and the dotted line shows the meridional image plane. The vertical axis represents the angle of view from the optical axis, and the horizontal axis represents the focus. The units are ° (degrees) and mm, respectively. In FIG. 5, the right figure is a distortion diagram, the vertical axis is the angle of view from the optical axis, and the horizontal axis is distortion. The units are ° (degrees) and%, respectively. In FIG. 6, the vertical axis represents field position, and the horizontal axis represents defocus. The units are ° (degrees) and mm, respectively. In FIG. 6, the Airy disk (radius is 1.22λF = 0.0006625 mm) at each field position and defocus is indicated by a circle. In all of the following comparative examples and examples, the same figure is similarly expressed.

  From the relationship with the Airy disk in FIG. 6, it can be seen that the best focus is sufficiently small. Here, when the object is placed 250 mm to the right, which is a finite distance from the front focal point, the aberration curve is as shown in FIG. 7, and the spot diagrams are as shown in FIGS. As can be seen from the field curvature of the aberration curve or the spot diagram, it can be seen that the field curvature is large. That is, when the lens group of the comparative example shown in FIG. 4 is applied to a stereoscopic optical device, an image on the display plate 11 for a finite distance has a large field curvature and is not focused on the periphery. Means to observe.

Example 1
In the imaging optical system of Example 1, with reference to the imaging optical system according to Comparative Example 1, distortion is generated and the projection relationship satisfies (12) or the approximate expression (14). did. FIG. 10 is a diagram illustrating a configuration of a lens group according to the first embodiment. The lens group includes, in order from the object side (the left side in the figure), a biconvex positive lens L11, a cemented lens of a biconcave negative lens L12 and a biconvex positive lens L13, and a biconvex positive lens. L14 includes a cemented lens of a negative meniscus lens L15 having a convex surface facing the object side and a positive meniscus lens L16 having a convex surface facing the object side, and a plano-concave lens L17 having a concave surface facing the object side.

Table 2 below lists the values of the specifications of the lens group according to Example 1.

  FIG. 11 is a diagram showing an aberration curve of the first embodiment where the object distance is infinity, and FIG. 12 is a diagram showing a spot diagram of the first embodiment where the object distance is infinity. Here, when the object is placed 250 mm to the right of the front focal point, the aberration curve is as shown in FIG. 13, and the spot diagram is as shown in FIG. As shown in these drawings, it can be seen that, by satisfying the above conditions, the change in aberration is very small even if the object position changes. In particular, it can be seen that the occurrence of curvature of field is extremely suppressed.

  Further, FIG. 15 shows a spot diagram of an object at infinity when a plane-parallel glass is put on the assumption that the thickness of the display plate 11 for finite distance is 2 mm. From this spot diagram, it can also be seen that there is no problem with the generation of aberration due to the insertion of the plane parallel plate.

(Comparative Example 2)
Since Comparative Example 1 and Example 1 did not consider chromatic aberration, the design was performed in consideration of chromatic aberration. FIG. 16 is a diagram illustrating a configuration of a lens group of Comparative Example 2. The lens group includes, in order from the object side, a cemented lens of a positive meniscus lens L61 having a convex surface directed to the image side, a positive meniscus lens L62 having a convex surface directed to the image side, and a negative meniscus lens L63 having a convex surface directed to the image side. The lens includes a biconvex positive lens L64, a cemented lens of a biconvex positive lens L65 and a negative meniscus lens L66 having a convex surface facing the image side, and a plano-concave lens L67 having a concave surface facing the object side. Table 3 below lists values of specifications of the lens group according to Comparative Example 2.

  FIG. 17 is a diagram showing an aberration curve of the comparative example 2 where the object distance is infinity, and FIG. 18 is a diagram showing a spot diagram of the comparative example 2 where the object distance is infinity. The chromatic aberration of the spot diagram is indicated by +, □ and Δ for three wavelengths of 0.4861327 μm, 0.5875618 μm and 0.6562725 μm, respectively.

  Here, when the object is placed 250 mm to the right of the front focal point, which is a finite distance, the aberration curve is as shown in FIG. 19, and the spot diagram is as shown in FIG. As shown in the figure, curvature of field is generated by an object having a finite distance as in Comparative Example 1.

(Example 2)
Next, Example 2 in consideration of chromatic aberration will be described. FIG. 21 is a diagram illustrating a configuration of a lens group according to the second embodiment. The lens group includes, in order from the object side, a cemented lens of a positive meniscus lens L21 having a convex surface facing the image side, a positive meniscus lens L22 having a convex surface facing the image side, and a negative meniscus lens L23 having a convex surface facing the image side. A cemented lens of a positive meniscus lens L24 having a convex surface facing the image side, a negative meniscus lens L25 having a convex surface facing the object side, and a positive meniscus lens L26 having a convex surface facing the object side, and a flat surface having a concave surface facing the object side Consists of a concave lens L27. Table 4 below lists values of specifications of the lens group according to Example 2.

  FIG. 22 is a diagram showing an aberration curve of Example 2 with an object distance of infinity, and FIG. 23 is a diagram showing a spot diagram of Example 2 with an object distance of infinity. Here, when the object is placed 250 mm to the right of the front focal point which is a finite distance, the aberration curve is as shown in FIG. 24 and the spot diagram is as shown in FIG. Although slight lateral chromatic aberration is generated in this example, it can be seen that the occurrence of field curvature is extremely suppressed even when the object position is changed.

  As described above, according to the present embodiment, occurrence of field curvature due to object movement can be suppressed. In other words, both on the image plane that forms an image on an object that exists at an infinite distance and on the image plane that forms an image on an object that exists at a finite distance, The occurrence of curvature of field can also be suppressed on each imaging plane where the image is formed. Therefore, when such an optical system is applied to a stereoscopic optical device, it is configured to display an image of a corresponding object distance by disposing display plates in both the near view and the distant view or in the depth direction. In this case, any display image can be observed in a state where the curvature of field is suppressed.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 observer, 2 optical axes, 3 right eye, 4 left eye, 10 lens group, 11 display board for finite distance, 12 display board for infinite distance, 15 finite distance image, 30 lens group for right eye, 31 for finite distance for right eye 32, right-eye infinite distance display, 40 left-eye lens group, 41 left-eye finite distance display, 42 left-eye infinite distance display, 100 main plane, 101 front focal plane, 102 rear focus Surface, 103 object surface, 104 object image surface, 110, 120 object point, 111, 121 image point

Claims (5)

A stereoscopic optical device comprising a plurality of display surfaces in an observation direction of an observer, and a lens group between the plurality of display surfaces and the observer,
In the lens group, when the angle formed by the optical axis of the incident principal ray on the observer side is θ and the focal length of the lens group is f, the height y of the image plane on the one display surface is A stereoscopic optical apparatus characterized by satisfying a conditional expression.

  The stereoscopic vision optical apparatus according to claim 1, wherein one display surface of the plurality of display surfaces is in a conjugate relationship with infinity with respect to the lens group. The lens group, the stereoscopic optical device according to claim 1 or 2, characterized by satisfying the below SL conditional expression.

  4. The stereoscopic optical apparatus according to claim 1, wherein the lens group is telecentric on the plurality of display surfaces. 5.   5. The stereoscopic optical apparatus according to claim 1, wherein an image that has been image-processed in a tall shape is displayed on the plurality of display surfaces. 6.

Images