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WO2007125761A1 - Module de camera a œil compose - Google Patents

Module de camera a œil compose Download PDF

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Publication number
WO2007125761A1
WO2007125761A1 PCT/JP2007/058139 JP2007058139W WO2007125761A1 WO 2007125761 A1 WO2007125761 A1 WO 2007125761A1 JP 2007058139 W JP2007058139 W JP 2007058139W WO 2007125761 A1 WO2007125761 A1 WO 2007125761A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
lens array
light shielding
optical filter
reference surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/058139
Other languages
English (en)
Japanese (ja)
Inventor
Satoshi Tamaki
Tatsutoshi Suenaga
Katsumi Imada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
Original Assignee
Panasonic Corp
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp, Matsushita Electric Industrial Co Ltd filed Critical Panasonic Corp
Publication of WO2007125761A1 publication Critical patent/WO2007125761A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/32—Means for focusing
    • G03B13/34—Power focusing
    • G03B13/36—Autofocus systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

Definitions

  • the present invention relates to a small and thin camera module.
  • the present invention relates to a compound-eye camera module that captures an image with a plurality of photographing optical lenses.
  • a subject image is converted into two-dimensional image information by forming a subject image on an image sensor such as a CCD or CMOS through a lens. Furthermore, a camera that measures distance information to a subject has also been proposed.
  • a diaphragm member 111, a lens array 112, a light shielding block 113, an optical filter array 114, and an image sensor 116 are arranged in this order from the subject side.
  • the lens array 112 includes a plurality of lenses.
  • the diaphragm member 111 includes a diaphragm (aperture) at a position that coincides with the optical axis of each lens of the lens array 112.
  • the optical filter array 114 includes a plurality of optical filters having different spectral characteristics for each region corresponding to each lens of the lens array 112, and covers the light receiving surface of the image sensor 116.
  • the light blocking block 113 includes a light blocking wall 113a at a position that coincides with the boundary between adjacent lenses of the lens array 112, that is, the boundary between adjacent optical filters of the optical filter array 114.
  • the image sensor 116 is mounted on the semiconductor substrate 115.
  • a driving circuit 117 and a signal processing circuit 118 are further mounted.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2003-143459
  • the camera module shown in FIG. 19 has the following problems due to assembly variations.
  • a force that does not form an image is generated, or unnecessary light is generated due to reflection of light by the light shielding wall 113a, thereby causing ghost. Both of these cause the measurement distance accuracy to deteriorate.
  • the base line length may be increased, but this is not preferable because it leads to an increase in the size of the camera module.
  • An object of the present invention is to provide a camera module that is small in size, has a short base line length, and can improve measurement distance accuracy.
  • the compound-eye camera module of the present invention includes a lens array having a plurality of lenses arranged on a single plane and having different optical axes, and a plurality of one-to-one correspondences to each of the plurality of lenses.
  • An image pickup device having an image pickup area; and a light-shielding block disposed between the lens array and the image pickup device and having a plurality of openings corresponding to each of the plurality of lenses.
  • the light shielding block is in contact with the lens array, a first reference plane that positions the lens array in the optical axis direction, and a second reference surface that is in contact with the imaging element and positions the imaging element in the optical axis direction.
  • a reference surface a third reference surface that contacts the lens array and positions the lens array in a first direction orthogonal to the optical axis, and a contact with the lens array that aligns the lens array with the optical axis and the first array.
  • a fourth reference plane positioned in a second direction orthogonal to one direction.
  • the assembly variation can be reduced, it is possible to prevent the measurement distance accuracy from being deteriorated due to the assembly variation. Accordingly, it is possible to provide a camera module with improved measurement distance accuracy even with a small camera module having a short base line length.
  • FIG. 1 is an exploded perspective view of a compound-eye camera module according to Embodiment 1 of the present invention.
  • Fig. 2 is a perspective view of the upper lens barrel as viewed from the side of the imaging device in the compound eye type camera module according to Embodiment 1 of the present invention.
  • FIG. 3A is a perspective view of the compound-eye camera module according to Embodiment 1 of the present invention as viewed from the subject side of the lens array.
  • FIG. 3B is a perspective view of the compound-eye camera module according to Embodiment 1 of the present invention as viewed from the image sensor side of the lens array.
  • FIG. 4A is a perspective view showing the subject side force of the light-shielding block in the compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 4B is a perspective view of the image sensor side force of the light shielding block in the compound eye type camera module according to Embodiment 1 of the present invention.
  • FIG. 4C is a perspective view showing the subject side force of the light-blocking block in the compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 5 is an exploded perspective view of another compound-eye camera module according to Embodiment 1 of the present invention, in which the light shielding wall and the outer cylinder portion are configured separately.
  • FIG. 6A is a ray diagram when no light-shielding film is provided in the compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 6B is a ray diagram when a light-shielding film is provided in the compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 7 is a plan view of a light shielding film in the compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 8A is a plan view of a compound-eye camera module according to Embodiment 1 of the present invention.
  • FIG. 8B is a cross-sectional view taken along line 8B-8B in FIG. 8A.
  • FIG. 9 is an exploded perspective view of a compound-eye camera module according to Embodiment 2 of the present invention.
  • FIG. 10 is a cross-sectional view of a compound eye type camera module according to Embodiment 2 of the present invention.
  • FIG. 11 is an exploded perspective view of a compound eye camera module according to Embodiment 3 of the present invention.
  • FIG. 12 is a cross-sectional view of a compound eye type camera module according to Embodiment 3 of the present invention.
  • FIG. 13 is an exploded perspective view of a compound-eye camera module according to Embodiment 4 of the present invention.
  • FIG. 14 is an exploded perspective view of another compound-eye camera module according to Embodiment 4 of the present invention.
  • FIG. 15 is an exploded perspective view of still another compound-eye camera module according to Embodiment 4 of the present invention.
  • FIG. 16 is an exploded perspective view of still another compound-eye camera module according to Embodiment 4 of the present invention.
  • FIG. 17 is an exploded perspective view of still another compound eye camera module according to Embodiment 4 of the present invention.
  • FIG. 18 is a perspective view of another outer cylinder portion viewed from the image sensor side in a compound eye type camera module according to the present invention.
  • FIG. 19 is an exploded perspective view of an imaging system of a conventional camera module.
  • the compound eye type camera module of the present invention described above is an optical filter module that is disposed between the lens array and the image sensor and transmits light in a specific wavelength band among light transmitted through the plurality of lenses. Furthermore, it is preferable to have. In this case, it is preferable that the light shielding block has a fifth reference surface that abuts the optical filter module and positions the optical filter module in the optical axis direction. As a result, the tilt of the optical filter module can be suppressed. Thus, it is possible to further prevent bad measurement distance accuracy due to variations.
  • the compound-eye camera module of the present invention described above is disposed between the lens array and the optical filter module, and has a plurality of openings corresponding to each of the plurality of lenses. It is preferable to further have a light shielding film. In this case, it is preferable that the plurality of openings of the light shielding film have the same size as or smaller than the plurality of openings of the light shielding block. Thereby, it is possible to prevent unnecessary light that has passed through a lens not corresponding to the imaging region from entering each imaging region. Therefore, it is possible to further prevent the measurement distance accuracy from being deteriorated.
  • Embodiment 1 of the present invention will be described below with reference to the drawings.
  • FIG. 1 is an exploded perspective view of a compound-eye camera module according to Embodiment 1 of the present invention.
  • 1 is a lens array
  • 2 is an optical filter module
  • 3 is a substrate
  • 4 is an image sensor
  • 5 is an upper barrel
  • 6 is a light-blocking block
  • 7 is a lens module
  • 8 is a light-shielding film.
  • the XYZ Cartesian coordinate system as shown is set.
  • the Z-axis passes through almost the center of the effective pixel area of the image sensor 4 and is perpendicular to this.
  • the X axis is perpendicular to the Z axis and is parallel to the light shielding walls 6 la and 61c described later of the light shielding block 6, and the Y axis is orthogonal to the Z axis and is described later as light shielding walls 6 lb and 6 Id of the light shielding block 6. It is a parallel axis.
  • the arrow side of the X, Y, and Z axes is the positive side of each axis. In the Z-axis direction, the positive side of the Z-axis (upper side of the paper in FIG. 1, the subject side) is the “upper side” of the camera module, and the negative side of the Z-axis (lower side of the paper in FIG. 1, image side) is the camera module. Called the "lower side”.
  • the lens array 1 integrally has four single lenses la to ld arranged on the same plane parallel to the XY plane.
  • Four lenses la ⁇ Each optical axis of Ld is parallel to the Z axis, and is arranged at four vertices of a virtual rectangle parallel to the XY plane.
  • Lens la ⁇ Two of Ld should satisfy the optical specifications such as MTF required for light in the wavelength band of red, blue, or green among the three primary colors of light. The remaining two are designed to satisfy the optical specifications such as MTF required for light in the near-infrared wavelength band!
  • the lenses la and lb are optimally designed for light in the wavelength bands of green and the lenses lc and Id in the near infrared.
  • Lens la ⁇ is made of a material such as glass or plastic. Formed in the body.
  • the flange back deviation between the lenses optimally designed for light in the same wavelength band is It is considered to be zero as much as possible.
  • Each of the lenses la to ld causes light from a subject (not shown) to form an image on the image sensor 4 after passing through the optical filter module 2.
  • the optical filter module 2 is disposed between the lens array 1 and the image sensor 4. Similarly to the lens array 1, the optical filter module 2 includes two optical filters 2a and 2c arranged on the same plane parallel to the XY plane. The two optical filters 2a and 2c transmit only light in any wavelength band of red, green, blue, and near infrared, respectively. In one embodiment, the optical filter 2a transmits light only in the wavelength band of green and the optical filter 2c transmits in the near-infrared wavelength band. When it is necessary to cut off infrared rays, the characteristics may be added to the optical filter 2a that transmits light in the visible wavelength band. The optical filter that transmits light in the same wavelength band is integrally formed. The optical filter 2a is disposed on the optical axes of the lenses la and lb, and the optical filter 2c is disposed on the optical axes of the lenses lc and Id.
  • the image sensor 4 is an image sensor such as a CCD or a CMOS, and includes a large number of pixels arranged two-dimensionally in the vertical and horizontal directions.
  • the effective pixel area of the image sensor 4 is substantially equally divided into four image areas 4a to 4d.
  • the four imaging regions 4a to 4d are arranged on the optical axes of the four lenses la to Id, respectively. As a result, on the four imaging regions 4a to 4d, subject images that have power only in the wavelength components of red, green, blue, and near infrared are independently formed.
  • the light from the subject that has passed through the lens la enters the optical filter 2a, and only the light in the green wavelength band passes through it and forms a subject image consisting of only the green wavelength component on the imaging region 4a.
  • Image the light from the subject that has passed through the lens lb enters the optical filter 2a, and only the light in the green wavelength band passes through it to form a subject image in which only the green wavelength component has power on the imaging region 4b.
  • Light from the subject that has passed through the lens lc is incident on the optical filter 2c, and only near-infrared wavelength band light passes through it, forming an image of the subject that has power only in the near-infrared wavelength component on the imaging region 4c.
  • the light from the subject that has passed through the lens Id enters the optical filter 2c, and only the light in the near-infrared wavelength band passes through it.
  • a subject image consisting only of near-infrared wavelength components is formed on the imaging region 4d.
  • Each pixel constituting the imaging regions 4a to 4d of the imaging device 4 photoelectrically converts light from an incident subject and outputs an electrical signal (not shown) corresponding to the intensity of the light.
  • the electric signal output from the image sensor 4 is subjected to various signal processing and image processing. For example, by using two images captured by the imaging regions 4a and 4b where green wavelength band light is imaged, the amount of parallax between these images can be obtained and the distance to the subject can be measured. Similarly, using two images captured by the imaging regions 4c and 4d where near-infrared wavelength band light is imaged, the amount of parallax between these images may be obtained and the distance to the subject measured. . Since two visible light images and two near-infrared light images are available, the distance to the subject can be measured day and night. These processes can be performed using a digital signal processor (DSP, not shown).
  • DSP digital signal processor
  • the upper barrel 5 is provided with a recess 51 on the lower surface thereof for holding and fixing the lens array 1.
  • the upper lens barrel 5 includes reference surfaces 52 and 53 facing the concave portion 51 side.
  • the reference planes 52 and 53 are parallel to the Z axis.
  • the reference plane 52 is parallel to the Y axis, and the reference plane 53 is parallel to the X axis.
  • the upper lens barrel 5 has four apertures (openings) 5a to 5d at positions where the optical axes of the four lenses la to Ld of the held lens array 1 pass.
  • the upper lens barrel 5 is made of a material that does not transmit light, and blocks external light that does not require any force other than the diaphragms 5a to 5d from entering the lenses la to Ld.
  • FIG. 3A and 3B are perspective views of the lens array.
  • 3A is a perspective view seen from the subject side
  • FIG. 3B is a perspective view seen from the image sensor side.
  • the lens array 1 includes reference surfaces 12 and 13 around the lens array 1.
  • the reference plane 12 is parallel to the Z axis and points in the positive direction of the X axis.
  • the reference plane 13 is parallel to the Z axis and points in the positive direction of the Y axis.
  • the lens array 1 includes four reference surfaces 14 facing the image sensor side.
  • the reference surface 52 provided on the upper lens barrel 5 and the reference surface 12 provided on the lens array 1 are pressed in the X-axis direction, and the reference surface 53 provided on the upper lens barrel 5 is The reference surface 13 provided on the lens array 1 is pressed against the Y-axis direction, and the lens array 1 is fitted and fixed in the recess 51 of the upper barrel 5.
  • the centers of the four stops 5a to 5d provided in the upper barrel 5 and the optical axes of the lenses 1a to Id coincide with each other.
  • the lens module 7 is composed of the lens barrel 5.
  • the depth of the recess 51 in the Z-axis direction is shallower than the thickness of the lens array 1 in the Z-axis direction. Accordingly, in a state where the lens array 1 is held by the upper lens barrel 5, a part of the reference surfaces 12 and 13 provided around the lens array 1 is exposed.
  • the light shielding block 6 includes light shielding walls 6 la to 6 Id arranged in a cross shape so as to form four openings 6a to 6d independent of each other, and the light shielding walls 6 la to 6 Provided with an outer cylindrical portion 62 for holding Id.
  • the light shielding walls 61a to 61d extend radially with respect to the Z axis, which is the central axis of the light shielding block 6, the light shielding walls 61a and 61c are along the XZ plane, and the light shielding walls 61b and 61d are along the YZ plane. .
  • the four openings 6a to 6d are arranged on the optical axes of the four lenses la to ld, respectively.
  • the light shielding walls 61a to 61d divide the effective pixel area of the image sensor 4 into four image areas 4a to 4d.
  • the sizes of the openings 6a to 6d viewed along the Z axis are substantially the same as or larger than the imaging regions 4a to 4d.
  • Lenses la ⁇ The light from the subject that has passed through Ld passes through the openings 6a-6d and is imaged on the imaging regions 4a-4d, respectively.
  • the light shielding walls 61a to 61d prevent the light force that has passed through one of the lenses la to ld from entering an imaging area that does not correspond to this lens.
  • the green wavelength band light incident obliquely on the lens la and passed through the optical filter 2a is not incident on the imaging region 4c where only the near-infrared wavelength band light should be incident.
  • a light shielding wall 6 Id that blocks light in the green wavelength band is provided along the boundary between the imaging region 4a and the imaging region 4c.
  • the outer cylindrical portion 62 surrounding the openings 6a to 6d prevents external light that does not pass through the lens array 1 and the optical filter module 2 from entering the imaging regions 4a to 4d. In this manner, the light blocking block 6 can prevent the generation of stray light or the like that prevents unnecessary light from entering each of the imaging regions 4a to 4d.
  • the light shielding block 6 also has a material force that does not transmit light, like the upper lens barrel 5. Further, the inner surfaces of the light shielding walls 61a to 61d and the outer cylindrical portion 62 exposed in the openings 6a to 6d are subjected to various surface treatments (for example, roughening treatment, plating, black, etc.) so that light reflection is minimized. It is preferable that the surface is subjected to a shading process, or a light shielding surface having a taper (that is, a surface inclined with respect to the Z axis) is formed.
  • a shading process or a light shielding surface having a taper (that is, a surface inclined with respect to the Z axis) is formed.
  • the light shielding walls 61a to 61d and the outer cylindrical portion 62 are configured separately to give a desired shape to the surfaces of the light shielding walls 61a to 61d and reduce the reflection of light on the light shielding wall surfaces.
  • Figure 5 shows an exploded perspective view of an example. Integrally formed light shielding wall 6 la ⁇ 6 Id and outer cylinder part 62 By assembling, the shading block 6 is obtained.
  • the light shielding walls 61a to 61d separately from the outer cylindrical portion 62, it is possible to eliminate the restrictions caused by the mold structure and the like regarding the shape to be imparted to the light shielding wall surface, and the light from the light shielding walls 61a to 61d can be removed. It is possible to further reduce reflection.
  • a light shielding wall 64 is formed on the subject side end face of the light shielding walls 61b and 61d so as to shield light between the optical filters 2a and 2c.
  • the lens array 1 side surface of the light blocking block 6 is provided with a recess 63 for holding and fixing the optical filter module 2.
  • the optical filter module 2 is positioned and fixed with respect to the light shielding block 6 by being inserted into the recess 63.
  • the optical filter 2a and the optical filter 2c are arranged so as to close the openings 6a and 6b and the openings 6c and 6d, respectively.
  • the optical filters 2a and 2c are brought into contact with a reference surface (fifth reference surface) 612 that is orthogonal to the Z axis provided on the light shielding block 6 that is the bottom surface of the recess 63, and positioned in the Z axis direction. The tilt of each optical filter 2a, 2c is suppressed.
  • FIG. 4B shows a perspective view of the light blocking block 6 as viewed from the image sensor 4 side.
  • the Z axis which is the central axis of the light shielding block 6, passes through a predetermined position of the effective pixel area of the image sensor 4, and the light shielding walls 61 a to 61 d of the light shielding block 6 include a large number of pixels constituting the image sensor 4.
  • the light shielding block 6 is positioned with respect to the image sensor 4 and fixed on the substrate 3 so as to coincide with the vertical and horizontal arrangement directions. As a result, the effective pixel area of the image sensor 4 is divided into four image areas 4a to 4d corresponding to the four openings 6a to 6d.
  • a reference plane (second reference plane) 65 abuts on the upper surface of the image sensor 4.
  • the light-blocking block 6 includes a reference plane (third reference plane) 67 that is parallel to the Z axis and faces the negative direction of the X axis, and a Y axis that is parallel to the Z axis.
  • the lens module 7 in which the lens array 1 is fixed to the upper barrel 5 presses the reference surface 12 provided on the lens array 1 against the reference surface 67 provided on the light shielding block 6, and the light shielding probe. Press the reference surface 13 provided on the lens array 1 against the reference surface 66 provided on the It is inserted into the shading block 6 and fixed.
  • the optical axis of each lens and the corresponding imaging area are positioned in a direction orthogonal to the Z axis.
  • the light that has passed through each of the lenses la to Ld is incident on the inner walls of the light shielding walls 61a to 61d and the outer cylinder 62, and the force that does not form a part of the subject image in the imaging areas 4a to 4d. It is possible to prevent the reflected light from entering the imaging areas 4a to 4d as unnecessary light.
  • assembly windows (through holes) 69x, 69y are provided in the outer cylindrical portion 62 of the light shielding block 6, and the lens array 1 is placed on the positive side of the X axis and the Y axis through the windows 69x, 69y.
  • the positioning accuracy in the direction perpendicular to the Z axis may be improved by pressing directly toward the positive side.
  • a light shielding film 8 is preferably provided.
  • the light shielding film 8 is provided between the lens array 1 and the optical filter module 2 on the upper surfaces of the optical filters 2a and 2c. The operation of the light shielding film 8 will be described with reference to FIGS. 6A and 6B.
  • FIG. 6A shows a ray diagram when the light shielding film 8 is not provided.
  • Incident light 31 emitted from the subject passes through the lens la, passes through the optical filter 2a, and forms an image on the original imaging region 4a.
  • the incident light ray 33 emitted from the subject passes through the lens lb, passes through the optical filter 2a, and returns to the original imaging area. Forms an image in area 4b.
  • incident light 32 from a subject that has a large incident angle and does not necessarily need to be imaged passes through lens la and filter 2a in order, and forms an image as unnecessary light in imaging area 4b that does not correspond to lens la. Will deteriorate.
  • the incident light beam 34 having a large incident angle and having a large incident angle passes through the lens lb, and is then shielded by the outer cylindrical portion 62 and does not form an image.
  • FIG. 6B shows a ray diagram when the light shielding film 8 is provided.
  • incident rays 31 and 33 emitted from the subject normally form images in the original imaging areas 4a and 4b, respectively.
  • the incident light beam 32 from the object passes through the lens la and is then shielded by the light shielding film 8 disposed on the optical filter module 2, thereby preventing the incident light 32 from being imaged as unnecessary light. It becomes possible.
  • the incident light beam 34 from the subject passes through the lens lb after being passed through the lens lb as in FIG.
  • the light blocking film 8 includes light blocking portions 81a to 81d arranged in a cross shape so as to form four independent openings 8a to 8d, as shown in FIG. And an outer frame portion 82 for holding the light shielding portions 81a to 81d.
  • the light shielding portions 81a to 81d extend radially with respect to the Z axis, which is the central axis of the light shielding block 6, the light shielding portions 81a and 81c are along the XZ plane, and the light shielding portions 81b and 8 Id are along the YZ plane. Yes.
  • the four openings 8a to 8d are arranged on the optical axes of the four lenses la to ld, respectively.
  • the four openings 8a to 8d have the same or slightly smaller opening area than the four openings 61a to 61d formed in the light blocking block 6.
  • the light shielding film 8 is formed on the light shielding block 6 by fitting two concave portions (notches) 83 provided on the outer frame portion 82 to two convex portions 611 (see FIG. 4A) provided on the light shielding block 6. The positioning is fixed.
  • the three reference surfaces 65 provided on the light shielding block 6 are brought into direct contact with the surface of the imaging element 4 in the Z-axis direction, and the four reference surfaces 65 provided on the lens array 1 are provided.
  • the reference surface 14 is brought into direct contact with the four reference surfaces 68 provided on the light blocking block 6 in the Z-axis direction.
  • the deviation of the focal point of the lens la ⁇ : Ld in the Z-axis direction with respect to the light receiving surfaces of the corresponding imaging regions 4a to 4d is different from the reference surface 65 and the reference surface 68 of the light shielding block 6. It is possible to suppress the distance accuracy between the values. Further, since the lenses la to Id are integrally formed, the flange back difference between the lenses that allow light of the same wavelength band to pass through can be made extremely small. As a result, the error amount of the generated parallax can be ignored.
  • the optical filters 2 a and 2 c are brought into direct contact with the reference surface 612 provided in the light shielding block 6 in the Z-axis direction.
  • the tilt of the optical filters 2a and 2b with respect to the image sensor 4 can be suppressed. Therefore, the error amount of the parallax generated due to the tilt of the optical filters 2a and 2c is very small and can be ignored.
  • an optical filter corresponding to a plurality of lenses optimally designed for the same wavelength band light is integrally formed.
  • two optical filters are applied to two lenses la and lb that are optimally designed for green light. Images can be obtained even if provided separately.
  • each optical filter may tilt in a different direction and angle due to assembly variations. In such a case, a large error in the amount of parallax for measuring the distance can occur. Will occur.
  • one optical filter integrated with a plurality of lenses optimally designed for the same wavelength band light is provided as in this embodiment, the optical filter tilts at the time of assembly. Even so, the two images that are compared to determine the parallax change in the same way due to this tilt, so the parallax error caused by the tilt is very small and can be ignored.
  • the lens array 1 is positioned in the X-axis direction with respect to the light shielding block 6 by directly contacting the reference surface 67 provided on the lens array 1 with the reference surface 67 provided on the light shielding block 6.
  • the lens array 1 is positioned in the Y-axis direction with respect to the light shielding block 6 by directly contacting the reference surface 13 provided on the lens array 1 with the reference surface 66 provided on the light shielding block 6.
  • the light shielding wall 64 can be provided between adjacent optical filters, and generation of stray light or the like (see FIG. 6A) can be prevented to some extent.
  • the light shielding wall 64 cannot be provided at a position corresponding to the boundary between adjacent imaging regions. Therefore, in this case, as described above, it is particularly desirable to provide the light shielding film 8 on the optical filter.
  • FIG. 8A shows a plan view of the camera module of the present embodiment.
  • FIG. 8B shows a cross-sectional view taken along the line 8B-8B in FIG. 8A.
  • the imaging surface (upper surface) of the imaging device 4 serving as a reference surface is in contact with the reference surface 65 provided on the light shielding block 6, and the reference surface 14 provided on the lens array 1 is shielded from light.
  • the reference surface 68 provided on the block 6 comes into contact,
  • the imaging device 4 the light shielding block 6, the lens array 1, and the optical filter module 2 are positioned in the Z-axis direction, and the imaging device It is obvious that the tilt of the lens array 1 and the optical filter module 2 with respect to 4 is suppressed.
  • the four imaging regions are almost equally divided regions.
  • the optical system of the present invention is not limited to this.
  • non-uniform regions in consideration of generated parallax It may be.
  • the linear expansion coefficient is uniform. Therefore, if the lens array 1 is made as symmetrical as possible, the shape against the temperature change is obtained. The change of becomes uniform. Therefore, by detecting the temperature using a thermistor or the like, the distance between the lenses at each temperature can be estimated, and the change in the optical axis position of each lens can be estimated. As a result, it is possible to correct the amount of parallax due to temperature changes and ensure the measurement distance accuracy.
  • FIG. 9 is an exploded perspective view of the compound-eye camera module according to Embodiment 2 of the present invention. Only the configuration of the light shielding block 6 is different from the first embodiment.
  • the light shielding walls 6 la to 6 Id and the outer cylindrical portion 62 are configured separately.
  • Light shielding portions 661a to 661d are integrally formed on the light shielding walls 61a to 61d, respectively.
  • a reference surface (first reference surface) 68 that contacts the reference surface 14 of the lens array 1 is formed integrally with the light shielding portions 661b to 661d, and a reference surface (third third surface) that contacts the reference surface 12 of the lens array 1 is formed.
  • Reference surface 67 is formed integrally with the light shielding portion 661a, and a reference surface (fourth reference surface) 66 that is in contact with the reference surface 13 of the lens array 1 is formed integrally with the light shielding portion 661d.
  • Contact Reference surface (fifth reference surface) 612 is formed integrally with the light shielding parts 661a to 661d, and a reference surface (second reference surface) 65 that contacts the imaging element 4 is formed integrally with the light shielding walls 61a to 61d. It has been done.
  • the imaging device 4 is brought into contact with the reference surface 65, and the lens array 1 and the optical filter module 2 are brought into contact with the reference surface 68 and the reference surface 612, respectively, so that the imaging device 4, the light shielding block 6, and the lens array 1 are brought into contact.
  • the optical filter module 2 is positioned and fixed in the Z-axis direction.
  • the lens array 1 is brought into contact with the reference surfaces 67 and 66, and the lens array 1 is positioned and fixed in a direction perpendicular to the Z axis.
  • FIG. 10 shows a cross-sectional view of a compound-eye camera module excluding the outer cylindrical portion 62 of the light shielding block 6.
  • it is the reference surface 65 that positions the image sensor 4 in the Z-axis direction, and it is the reference that positions the lens array 1 and the optical filter module 2 in the Z-axis direction.
  • the light shielding block 6 is assembled by extrapolating and fitting the outer cylindrical portion 62 to the light shielding portions 66la to 66Id.
  • the outer cylindrical portion 62 of the light shielding block 6 is provided for the purpose of preventing the light beam that does not pass through each lens from forming an image on the imaging region, and suppresses tilt, focus shift, etc. of each component constituting the optical system. Unlike Embodiment 1, this is performed by the light shielding walls 61a to 61d and the light shielding parts 661a to 661d.
  • the relative tilt and defocus of the lens array 1 and the optical filters 2a and 2c with respect to the image sensor 4 and the Z axis of the lens array 1 with respect to the light shielding block 6 are as follows. Displacement in a direction orthogonal to the direction can be suppressed. Therefore, even if simple assembly is performed without using a complicated and expensive adjustment mechanism at the time of assembly, the error generated when measuring the distance to the subject can be extremely reduced, and the measurement distance accuracy can be improved. Becomes pretty.
  • FIG. 11 shows an exploded perspective view of the main components of the compound eye camera module according to Embodiment 3 of the present invention.
  • the difference from the first embodiment is only the lens array 1, the optical filter module 2, and the light shielding walls 61a to 61d.
  • the upper barrel 5 and the outer cylinder 62, which are components of the light shielding block 6, and the substrate 3 having the same functions as those of the first and second embodiments are not shown.
  • a reference plane 14 for positioning and fixing the lens array 1 with respect to the image sensor 4 in the Z-axis direction is provided in a region of the lens array 1 facing the optical filter module 2.
  • the optical filter module 2 is composed of four optical filters 2a to 2d.
  • the optical filters 2a and 2b transmit only light in the same wavelength band, and the optical filters 2c and 2d only transmit light in the same wavelength band. Permeate. In one embodiment, the optical filters 2a and 2b transmit only light in the green wavelength band, and the optical filters 2c and 2d transmit only light in the near-infrared wavelength band.
  • a reference surface (first reference surface) 68 that comes into contact with the reference surface 14 of the lens array 1 is provided on the upper end surface of the wall surface 64 in which the light shielding walls 61a to 6 Id extend in the Z-axis direction toward the lens array 1 side. It has been.
  • a reference surface (third reference surface) 67 that contacts the reference surface 12 of the lens array 1 is integrally formed with the light shielding wall 61a, and a reference surface that contacts the reference surface 13 of the lens array 1 (fourth reference surface) 66. Is formed integrally with the light shielding wall 61d, and a reference surface (second reference surface) 65 that comes into contact with the image sensor 4 is formed integrally with the light shielding walls 6la to 61d.
  • a reference surface (fifth reference surface) 612 that contacts the optical filters 2a to 2d is provided on the light shielding walls 61a to 61d.
  • Fig. 12 shows a cross-sectional view to explain the mutual relationship between the components.
  • the reference surface 65 of the light shielding walls 61a to 61d is brought into contact with the imaging element 4.
  • the optical filters 2a to 2d are brought into contact with a reference surface 612 provided on the light shielding walls 61a to 61d, and the optical filters 2a to 2d are positioned and fixed in the Z-axis direction.
  • the reference surface 14 of the lens array 1 is brought into contact with a reference surface 68 provided on the light shielding walls 61a to 61d, and the lens array 1 is positioned and fixed in the Z-axis direction.
  • the reference surface 12 and the reference surface 13 of the lens array 1 are brought into contact with the reference surface 67 provided on the light shielding wall 61a and the reference surface 66 provided on the light shielding wall 61d, respectively, so that the lens array 1 is orthogonal to the Z axis. Position in the direction.
  • the lens array 1 and the optical filters 2a to 2d with respect to the image sensor 4 are relatively tilted, defocused, and the Z of the lens array 1 with respect to the light blocking block 6 is Z.
  • the positional deviation in the direction orthogonal to the axis can be suppressed. Therefore, even if simple assembly is performed without using a complicated and expensive adjustment mechanism at the time of assembly, the error that occurs when measuring the distance to the subject can be extremely reduced and the measurement distance accuracy can be improved. Is possible.
  • the wall surface 64 on the light shielding walls 61a to 61d is in contact with the lens array 1, the light beam 32 described in FIG. 6A collides with the wall surface 64. Therefore, in the present embodiment, the light shielding film 8 between the lens array 1 and the optical filter module 2 can be omitted. Therefore, the cost can be reduced.
  • FIG. 13 shows a case where light in the visible light region needs to be imaged in the imaging regions 4a and 4b by blocking light in the near infrared and lower frequencies (hereinafter simply referred to as "near infrared light”).
  • FIG. 3 is an exploded perspective view of the camera module.
  • an optical filter that blocks near-infrared light.
  • the near-infrared light is applied to the optical filter 2a that transmits green light.
  • the region 9a corresponding to the optical filter 2a of the base material (for example, a transparent glass substrate) 9 provided separately from the optical filter 2a is provided. It is preferable to form an IR filter that blocks near infrared light. In this case, the optical filter function is not given to the region 9c of the base material 9 corresponding to the optical filter 2c that transmits near-infrared light.
  • the substrate 9 is positioned in the Z-axis direction by contacting the optical filter module 2.
  • the light shielding film 8 is provided between the lens array 1 and the substrate 9.
  • the base material 9 may be disposed between the optical filter module 2 and the light shielding block 6. In this case, the base material 9 comes into contact with the reference surface 612.
  • the light shielding film 8 is provided between the lens array 1 and the optical filter module 2.
  • the camera module shown in FIG. 14 uses the light shielding block 6 in which the light shielding walls 6 la to 6 Id that divide the imaging region and the outer cylindrical portion 62 are separate from each other as in FIG. Different from the camera module shown in Fig.13.
  • the camera module shown in FIG. 15 is provided between the light shielding film 8 force lens array 1 and the base material 9 on which the IR filter 9a is formed, and between the base material 9 and the optical filter module 2. This is different from the camera module shown in FIG.
  • the IR filter 9a is formed on the base material 9 different from the optical filter module 2
  • the total thickness of the base material 9 and the optical filter module 2 is increased. Therefore, in the configuration shown in FIG. There is a high possibility that light from the light enters the imaging area that does not correspond to the lens that has passed through.
  • a two-layer light shielding film 8 is provided as shown in FIG. Thereby, it is possible to prevent unnecessary light that has passed through the lens corresponding to the imaging area from entering each imaging area. As a result, it is possible to prevent the measurement distance accuracy from deteriorating.
  • the camera module shown in FIG. 16 is different from the camera module shown in FIG. 13 in that the base material 9 on which the IR filter 9a is formed is provided closer to the subject than the upper lens barrel 5.
  • the parts that make up the optical system, such as the lens module 7 and the light-blocking block 6, may be broken when touched directly by the user, so the camera module is covered with a camera chassis (not shown).
  • the portion of the lens module 7 including the apertures 5a to 5d needs to expose the camera chassis force.
  • the lens module 7 is covered with a highly transparent protective cover in order to prevent the user from directly touching the exposed portion.
  • the base material 9 on which the IR filter 9a is formed is used as a protective cover for preventing the user from directly touching the camera module.
  • the number of parts can be reduced and the thickness of the camera module can be reduced as compared with the case where a protective cover is provided separately from the base material 9.
  • the optical filter module 2 is used so that each of the imaging regions 4a to 4d images light of a specific wavelength band.
  • the camera module shown in FIG. 17 is different from the above-described camera modules in that the optical filter module 2 is used!
  • each of the imaging regions 4 a to 4 d images light in all wavelength bands in which the imaging element 4 has sensitivity.
  • an inexpensive camera module can be provided.
  • the gap between the lens array 1 and the light shielding walls 61a to 61d can be reduced. This can reduce the possibility of unnecessary light described with reference to FIG. 6A. Accordingly, the light shielding film 8 is also omitted in the camera module of FIG.
  • the optical filters (optical filters 2a, 2b, 2c, 2d and IR filter 9a) that selectively transmit light in a specific wavelength band are formed on a base material (for example, a transparent glass substrate).
  • a base material for example, a transparent glass substrate.
  • the present invention is not limited to this.
  • an optical filter may be formed directly on the image sensor 4, the same effect as described above can be obtained.
  • an optical filter having the same characteristics may be formed on all pixels in one imaging area, but each color light of red, green, and blue is selectively transmitted.
  • Optical filters may be arranged in a bay array on the pixels in the imaging area.
  • a color image can be obtained by arranging the optical filters in such a Bayer arrangement.
  • the effective pixel area of the imaging element 4 is divided into four imaging areas as described above, and optical filters are arranged in a Bayer array in two of the imaging areas, and near red in the remaining two imaging areas. You may arrange
  • the effective pixel area of the imaging element 4 is divided into four imaging areas, but the number of imaging areas, the arrangement of a plurality of imaging areas, and the like can be changed as appropriate.
  • the optical filter module 2 described above is composed of a plurality of components separately created for each wavelength band of light to be transmitted (for example, green light and near-infrared light). It is not limited to. For example, it may be composed of a single component in which optical filters having different characteristics (for example, a green optical filter and a near infrared optical filter) are formed in different regions of a common base material.
  • optical filters having different characteristics for example, a green optical filter and a near infrared optical filter
  • the light shielding film 8 is a force provided separately from the optical filter 2 and the substrate 9.
  • the present invention is not limited to this.
  • the light shielding film 8 may be directly formed on the optical filter 2 and the substrate 9 using printing or the like, the same effect as described above can be obtained.
  • two reference surfaces that are in contact with each other to suppress tilt and the like are flat surfaces, and the force that the two planar reference surfaces are in surface contact with each other.
  • the present invention is not limited thereto.
  • the planar reference surface and the spherical reference surface may be brought into point contact, or the planar reference surface and the bowl-shaped reference surface may be brought into line contact.
  • the reference surface (second reference surface) that contacts the image sensor 4 may be composed of three spherical surfaces 65R on which fillets are formed as shown in FIG. This part is also used to position the part in one direction.
  • the number of reference surfaces provided on the product is not limited to the above-described embodiment, and can be changed as appropriate.
  • the field of application of the compound eye camera module of the present invention is not particularly limited, but it is preferably used for, for example, a small-sized and thin mobile phone having a camera function, a digital still camera, a surveillance camera, an in-vehicle camera, and the like. can do.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Cameras In General (AREA)
  • Stereoscopic And Panoramic Photography (AREA)
  • Blocking Light For Cameras (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

La présente invention concerne un module de caméra à œil composé où un bloc de protection contre la lumière (6) comportant des ouvertures (6a-6d) est prévu entre une matrice de lentilles (1) et un élément de formation d'image (4). La matrice de lentilles (1) est munie de lentilles (1a-1d) comportant des axes optiques différents les uns des autres, et l'élément de formation d'image (4) comporte des régions de formation d'image (4a-4d). Le bloc de protection contre la lumière comporte une première surface standard (68) en contact avec la matrice de lentilles et la positionnant dans la direction d'axe optique, une deuxième surface standard (65) en contact avec l'élément de formation d'image et le positionnant dans la direction d'axe optique, une troisième surface standard (67) en contact avec la matrice de lentilles et la positionnant dans une première direction perpendiculaire à la direction d'axe optique, et une quatrième surface standard (66) en contact avec la matrice de lentilles et positionnant ladite matrice de lentilles dans une seconde direction perpendiculaire à la direction d'axe optique et la première direction. Bien que facilement assemblé, le module de caméra à œil composé présente une précision élevée en termes de distances mesurées et est de petite taille et mince.
PCT/JP2007/058139 2006-04-24 2007-04-13 Module de camera a œil compose Ceased WO2007125761A1 (fr)

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JP2006-118659 2006-04-24
JP2006118659A JP2009164654A (ja) 2006-04-24 2006-04-24 複眼方式のカメラモジュール

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WO2007125761A1 true WO2007125761A1 (fr) 2007-11-08

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Cited By (6)

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WO2009087974A1 (fr) * 2008-01-11 2009-07-16 Panasonic Corporation Module de caméra binoculaire
WO2009104394A1 (fr) * 2008-02-18 2009-08-27 パナソニック株式会社 Module d'appareil photo à œil composé
US8194169B2 (en) 2006-01-20 2012-06-05 Panasonic Corporation Compound eye camera module and method of producing the same
JP2012226245A (ja) * 2011-04-22 2012-11-15 Canon Inc 焦点検出装置および光学機器
WO2015178079A1 (fr) * 2014-05-20 2015-11-26 コニカミノルタ株式会社 Dispositif de capture d'images, procédé de commande d'un dispositif de capture d'images et programme de commande du dispositif de capture d'images
CN106918889A (zh) * 2015-12-25 2017-07-04 吉佳科技股份有限公司 摄像头组校正方法

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JP5555046B2 (ja) * 2010-05-18 2014-07-23 日本電信電話株式会社 画像入力装置、画像入力方法及び画像入力プログラム
US9876992B2 (en) 2014-04-30 2018-01-23 Panasonic Intellectual Property Management Co., Ltd. Imaging apparatus and distance measuring apparatus using the same
CN105223756B (zh) * 2015-10-06 2018-03-09 瑞声光电科技(常州)有限公司 阵列式镜头模组
JP6878111B2 (ja) 2017-04-21 2021-05-26 ソニーモバイルコミュニケーションズ株式会社 固体撮像装置及び情報処理装置
CN111557050A (zh) * 2018-01-15 2020-08-18 索尼公司 生物体信息获取装置、生物体信息获取方法和可穿戴装置

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JPH04306607A (ja) * 1991-04-03 1992-10-29 Fuji Photo Film Co Ltd 測距レンズの位置決め方法
JP2000352663A (ja) * 1999-04-07 2000-12-19 Olympus Optical Co Ltd 測距装置
JP2001174682A (ja) * 1999-12-20 2001-06-29 Canon Inc 焦点検出装置およびこれを備えた光学機器
JP2003133336A (ja) * 2001-10-30 2003-05-09 Fuji Electric Co Ltd 半導体装置
JP2003143459A (ja) * 2001-11-02 2003-05-16 Canon Inc 複眼撮像系およびこれを備えた装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8194169B2 (en) 2006-01-20 2012-06-05 Panasonic Corporation Compound eye camera module and method of producing the same
WO2009087974A1 (fr) * 2008-01-11 2009-07-16 Panasonic Corporation Module de caméra binoculaire
WO2009104394A1 (fr) * 2008-02-18 2009-08-27 パナソニック株式会社 Module d'appareil photo à œil composé
US8106344B2 (en) 2008-02-18 2012-01-31 Panasonic Corporation Compound eye camera module
JP2012226245A (ja) * 2011-04-22 2012-11-15 Canon Inc 焦点検出装置および光学機器
WO2015178079A1 (fr) * 2014-05-20 2015-11-26 コニカミノルタ株式会社 Dispositif de capture d'images, procédé de commande d'un dispositif de capture d'images et programme de commande du dispositif de capture d'images
CN106918889A (zh) * 2015-12-25 2017-07-04 吉佳科技股份有限公司 摄像头组校正方法

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