WO2024013969A1 - レンズユニットを有するカメラ装置 - Google Patents

レンズユニットを有するカメラ装置 Download PDF

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Publication number
WO2024013969A1
WO2024013969A1 PCT/JP2022/027808 JP2022027808W WO2024013969A1 WO 2024013969 A1 WO2024013969 A1 WO 2024013969A1 JP 2022027808 W JP2022027808 W JP 2022027808W WO 2024013969 A1 WO2024013969 A1 WO 2024013969A1
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WO
WIPO (PCT)
Prior art keywords
lens unit
camera device
lens
contact
positioning
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/JP2022/027808
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English (en)
French (fr)
Japanese (ja)
Inventor
賢一 竹内
秀則 篠原
武志 芳賀
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.)
Astemo Ltd
Original Assignee
Hitachi Astemo 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 Hitachi Astemo Ltd filed Critical Hitachi Astemo Ltd
Priority to JP2024533466A priority Critical patent/JP7822478B2/ja
Priority to PCT/JP2022/027808 priority patent/WO2024013969A1/ja
Publication of WO2024013969A1 publication Critical patent/WO2024013969A1/ja
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
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for 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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • 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
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Definitions

  • the present invention relates to a camera device having a lens unit.
  • Automotive stereo cameras which are a type of external world recognition sensor for advanced driving assistance systems (ADAS) and autonomous driving (AD) systems, use left and right images captured synchronously by the left and right cameras.
  • This is a device that calculates parallax information and measures the distance to an imaged object (another vehicle, pedestrian, obstacle, etc.) (hereinafter referred to as “distance measurement”).
  • Distance measurement by the camera device is based on parallax information between the left and right images, so in order to achieve accurate distance measurement, it is necessary to accurately fix the left and right camera modules to the housing so that the parallax information can be calculated accurately. There is a need to.
  • FIG. 8 is an exploded perspective view of the main parts of a general camera device, viewed from the front.
  • This camera device includes a highly rigid casing 100 that forms the front outer shell of the camera device, a left camera module 1L fixed to the back left side of the casing 100, and a right camera module 1L fixed to the back right side of the casing 100. It is equipped with 1R.
  • the distance between the optical axes of both camera modules is the baseline length L
  • the angle around the optical axis of the left camera module 1L is the roll angle ⁇ L
  • the angle around the optical axis of the right camera module 1R is the roll angle ⁇ R
  • an in-vehicle imaging device disclosed in Patent Document 1 is known.
  • paragraph 0018 of the same document states ⁇ The present invention provides an in-vehicle imaging device that is capable of highly accurate optical axis adjustment of the imaging unit with respect to the casing while minimizing precision machining of the casing.
  • Paragraph 0019 states, ⁇ The present invention provides a lens, and an optical axis of the lens as a normal line, when viewed from the optical axis direction of the lens.
  • an image sensor section having a lens holder having three reference surfaces arranged so as to surround the lens; an insertion section through which the lens holder is inserted; an opposing surface facing the reference surface; a casing having three adhesive filling parts arranged so as to surround the insertion part and penetrating from the opposing surface side to the opposite side of the opposing surface, the imaging element section and the casing; "is characterized in that the mutual positional relationship is fixed only by the adhesive in the three adhesive filling parts.”
  • Patent Document 1 discloses a method in which adhesive is filled in the adhesive filling portion of the housing with the reference surface of the lens holder in contact with the facing surface of the housing, and the positional relationship between the housing and the lens holder is adjusted. By fixing it, highly accurate optical axis adjustment is possible.
  • Patent Document 1 also discloses that adhesives are used to fix the positional relationship between the housing and the lens holder, making it easier to precisely process and mold the housing. The cost is reduced by minimizing the required processing cost (see paragraph 0059 of the same document, etc.).
  • the camera module 20L1 of this embodiment shown in FIGS. 5A and 5B is held in the lens holder 21L1.
  • a concave shape 25L1 and a convex shape 26L1 having a height recessed from the reference surface 24L1 are formed inside the concave shape 25L1, as shown in FIG. 5C, on the reference surface 24L1 whose normal is the optical axis of the lens.
  • the concave shape 25L1 and the convex shape 26L1 are formed at positions that serve as landmarks when looking into the reference surface 24L1 from the adhesive filling portion 14L of the housing 10.”
  • the position of the lens holder must be adjusted so that the marks (concave shape, convex shape) on the reference surface can be seen when looking at the reference surface of the lens holder from the adhesive filled part of the housing.
  • the marks concave shape, convex shape
  • the position of the lens holder must be adjusted so that the marks (concave shape, convex shape) on the reference surface can be seen when looking at the reference surface of the lens holder from the adhesive filled part of the housing.
  • the mark is a reference for adjusting the position of the lens holder, and the mark itself does not have the function of regulating the positional relationship between the housing and the lens holder. There was also the problem that the accuracy of the relationship could not be ensured sufficiently.
  • the present invention provides a camera device that can reduce production costs by shortening the assembly work time when attaching the camera module to the housing, and also improve the accuracy of attaching the camera module to the housing.
  • the purpose is to
  • a camera device of the present invention includes a lens barrel section in which a plurality of lenses are housed, and a reference surface that is perpendicular to the optical axis of the lenses and that abuts on an external contact surface. and a positioning structure that fixes the center position of the lens or restricts movement in the rotational direction while the reference surface is in contact with the contact surface.
  • the camera device of the present invention it is possible to reduce production costs by shortening the assembly work time when attaching the camera module to the casing, and to improve the accuracy of attaching the camera module to the casing.
  • FIG. 1 is an exploded perspective view of main parts of a camera device according to an embodiment, seen from the rear.
  • FIG. 2 is a perspective view of a camera module according to an embodiment.
  • FIG. 2 is a top view of a camera module according to an embodiment.
  • FIG. 3 is an enlarged view of the left camera module mounting portion on the back surface of the casing in one embodiment.
  • FIG. 3 is a diagram illustrating a manufacturing procedure of a camera module according to an embodiment.
  • FIG. 3 is a diagram illustrating a manufacturing procedure of a camera module according to an embodiment.
  • FIG. 3 is a diagram illustrating a manufacturing procedure of a camera module according to an embodiment.
  • FIG. 3 is a diagram illustrating a manufacturing procedure of a camera module according to an embodiment.
  • FIG. 3 is a diagram illustrating a manufacturing procedure of a camera module according to an embodiment.
  • FIG. 1 is an exploded perspective view of the main parts of a general camera device, seen from the front.
  • FIG. 1 is an exploded perspective view of the main parts of the camera device of this embodiment, viewed from the rear.
  • the structure of the camera device of this embodiment is basically the same as that of FIG. 8 described above, but differs in the shape of the contact portion between the housing 100 and the camera module 1, which will be described later.
  • the camera device of this embodiment includes a main control that controls the camera module 1, processes the output signal of the camera module 1 to generate an image, and calculates parallax information by comparing the left and right images.
  • a substrate, a back cover that covers the back of the casing 100, and the like are also provided, but these are not shown in FIG.
  • FIG. 2 is a perspective view of the camera module 1
  • FIG. 3 is a top view of the camera module 1.
  • the camera module 1 includes a lens unit 10, an image sensor board 20, and wiring 30.
  • the lens unit 10 is a resin component that holds a plurality of lenses and also fixes the camera module 1 to the housing 100.
  • a plurality of reference planes 12 arranged on the same plane perpendicular to the optical axis and a plurality of positioning pins 13 which are a structure for fixing the camera module 1 to the housing 100 are integrally molded.
  • three reference planes 12 are arranged in a substantially equilateral triangle shape to surround the lens barrel part 11, and two positioning pins are arranged on the same plane that includes the optical axis of the lens barrel part 11.
  • reference planes 12 are arranged so as to surround the lens barrel part 11, and two or more positioning pins 13 are arranged so as to surround the lens barrel part 11,
  • the number and arrangement of the reference plane 12 and the positioning pins 13 are not limited to those shown in the drawings.
  • the image sensor board 20 is a board on which the image sensor 21 is arranged on the optical axis of the lens barrel section 11, and is fixed to the lens unit 10 in a procedure described later.
  • the image sensor 21 is a CMOS image sensor or the like that captures an image in the optical axis direction through the lens barrel section 11.
  • the wiring 30 is FPC (Flexible printed circuits), FFC (Flexible Flat Cable), etc., which connects the image sensor board 20 and the main control board.
  • FPC Flexible printed circuits
  • FFC Flexible Flat Cable
  • FIG. 4 is a rear view of the housing 100, showing an enlarged view of the vicinity of the fixed portion of the left camera module 1L. Note that the structure near the fixing part of the right camera module 1R is also the same, so the description of the right fixing part will be omitted below.
  • three contact surfaces 101 are provided on the back surface of the housing 100 at positions facing the three reference surfaces 12 of the lens unit 10, and are connected to one positioning pin 13 of the lens unit 10.
  • a positioning hole 102 is provided at an opposing position, and a positioning elongated hole 103 is provided at a position opposing the other positioning pin 13.
  • the left camera The module 1L can be fixed to the housing 100. Note that since the positioning elongated hole 103 is formed long in the linear direction connecting the positioning hole 102 and the positioning elongated hole 103, even if there is some variation in the distance between the positioning pins 13 of the lens unit 10, both positioning pins 13 can be inserted into the positioning hole 102 and the positioning elongated hole 103.
  • the pin of the lens unit 10 is inserted into the hole of the housing 100 to position both of them, but it is also possible to insert the pin of the housing 100 into the hole of the lens unit 10 to position both of them. Also good. Furthermore, a recess into which the lens unit 10 is fitted may be provided in the housing 100 so that both can be positioned.
  • the plurality of reference surfaces 12 of the lens unit 10 are formed on the same plane perpendicular to the optical axis of the lens barrel portion 11 of the lens unit 10 (that is, the optical axis of the camera module 1). Further, since the plurality of contact surfaces 101 of the housing 100 are formed as planes facing each of the plurality of reference surfaces 12 formed on the same plane, the contact surfaces 101 are also formed on the same plane. will be done.
  • the reference plane 12 which is normal to the optical axis of the left and right lens units 10
  • the reference planes 12 of the left and right camera modules 1L, 1R are pressed against the same plane, the same state is achieved, and the optical axes of the left and right camera modules 1L, 1R perpendicular to the same plane become parallel.
  • the left and right optical axes should be parallel to each other, the distance between the optical axes (baseline length L) of the left and right camera modules 1L and 1R should be within a specified value, and, It is necessary to keep the left and right roll angles ⁇ L and ⁇ R within specified values.
  • the pair of positioning pins 13 provided on the lens unit 10 are fitted into the positioning hole 102 and the positioning elongated hole 103 of the housing 100, so that each positioning pin 13 is attached to the housing.
  • This serves as a reference for positioning with respect to the body 100 and a reference for roll rotation with respect to the housing 100, making it possible to simultaneously suppress errors in the position of the camera module 1 and the roll angle ⁇ .
  • the roll angle ⁇ is the rotation angle of the camera module 1 with the optical axis as the rotation axis.
  • this roll angle ⁇ exists, it causes rotation of the image captured by the image sensor 21. do. Therefore, even if the roll angle ⁇ is fixed by the positioning pin 13 of the lens unit 10, if the image sensor 21 itself has the roll angle ⁇ with respect to the optical axis, rotation of the captured image will occur. It turns out.
  • FIG. 5A is a perspective view of the adjustment jig 200 and the lens unit 10 before being fixed, viewed from above, and the arrow in the figure indicates the moving direction of the lens unit 10.
  • the adjustment jig 200 has a substantially U-shaped structure with a pair of protrusions, and is provided with a through hole 201 at a position scheduled to face the reference surface 12 of the lens unit 10.
  • the orthogonal coordinate system in the figure is a coordinate system set such that the X axis points in the long side direction of the lens unit 10, the Y axis points in the short side direction of the lens unit 10, and the Z axis points in the optical axis of the lens unit 10. be.
  • FIG. 5B is a perspective view of the lens unit 10 and adjustment jig 200 of FIG. 5A viewed from below.
  • a contact surface 202, a positioning V-groove 203, and a positioning plane 204 are formed on the bottom surface of the adjustment jig 200.
  • the contact surface 202 is a plane formed to surround the lower end of the through hole 201 and simulates the function of the contact surface 101 in FIG. It is formed in the planned position.
  • the positioning V-groove 203 is a groove on the adjustment jig 200 that simulates the function of the positioning hole 102 in FIG.
  • the positioning plane 204 is a plane that simulates the function of the positioning elongated hole 103 in FIG.
  • FIG. 5C is a perspective view showing the lens unit 10 fixed to the adjustment jig 200.
  • one positioning pin 13 of the lens unit 10 is made tangential to the two surfaces of the positioning V-groove 203 of the adjustment jig 200, and the other positioning pin 13 is made tangential to the positioning plane 204, so that the housing can be fixed.
  • a state in which the positioning pin 13 of the lens unit 10 is fixed to the positioning hole 102 and the positioning elongated hole 103 of 100 is simulated, and movement of the lens unit 10 in the X-axis and Y-axis directions is regulated.
  • the lens unit 10 is fixed to the adjustment jig 200.
  • a method of fixing the lens unit 10 to the adjustment jig 200 a method of mechanically fixing the lens unit 10 may be adopted, and in that case, the through hole 201 may be omitted.
  • the tip of the positioning pin 13 is positioned at a position farther from the contact surface 202 in the optical axis direction with the reference surface 12 in contact with the contact surface 202.
  • This adjustment method is an adjustment method that simultaneously adjusts the vertical position (focus adjustment direction) and horizontal position (center optical axis position) of the image sensor 21 with respect to the lens unit 10, as well as the image tilt and roll angle of the lens unit 10. be.
  • FIG. 6 shows the center collimator C0 and peripheral collimator C1 installed in the imaging direction of the lens unit 10, and the image sensor board 20 and wiring 30 placed on the back side of the lens unit 10 in order to implement Active Alignment. show.
  • the lens unit 10 is fixed to an adjustment jig 200 (not shown), and the relative relationship between the lens unit 10 and the image sensor substrate 20 can be adjusted.
  • the central collimator C0 is a collimator placed on the object side so as to be coaxial with the optical axis of the lens unit 10.
  • the peripheral collimators C1 are four collimators arranged parallel to the central collimator C0 along the four sides of a virtual rectangular column whose central axis is the optical axis of the lens unit 10. Therefore, the peripheral collimators C1 are arranged one by one in the first to fourth quadrants of the XY coordinate system of the lens unit 10 shown in FIG. It becomes.
  • each collimator has, for example, a crosshair reticle, and this crosshair reticle can be observed at an infinite distance.
  • FIG. 7 is a diagram showing a procedure for adjusting the position and attitude of the image sensor 21 with respect to the lens unit 10, and R0 and R1 in the figure represent images formed on the image sensor 21 via the lens unit 10, respectively.
  • This is a reticle cross image of the central collimator C0 and the peripheral collimator C1.
  • the peripheral collimators C1 are arranged one by one from the first quadrant to the fourth quadrant of the XY coordinate system of the lens unit 10 in FIG.
  • the reticle cross images R1 of the peripheral collimator C1 are formed one by one from the first quadrant to the fourth quadrant.
  • the reticle cross image R0 captured through the lens unit 10 is set to the desired coordinates of the image sensor 21 (for example, the optical axis is If the camera module 1 is designed to be placed at the center of the image sensor 21, it is assumed that the camera module 1 is shifted from the center coordinates of the image sensor 21.
  • the position of the image sensor 21 with respect to the lens unit 10 i.e., the position of the image sensor 21 on which the image sensor 21 is arranged
  • position of the substrate 20 position of the substrate 20
  • the relative relationship between the lens unit 10 and the image sensor 21 is adjusted to an ideal position without rotation around the optical axis. Specifically, from the coordinates of the four reticle cross images R1 projected on the XY coordinate system of the image sensor 21, the XY coordinate system of the image sensor 21 is calculated relative to the XY coordinate system of the lens unit 10 defined by the peripheral collimator C1. The rotation angle is calculated, and the rotation adjustment of the image sensor 21 (that is, the rotation adjustment of the image sensor substrate 20) is performed so that the roll angle ⁇ of both XY coordinate systems becomes 0.
  • the relative relationship can be fixed at an ideal position without rotation around the optical axis.
  • SYMBOLS 1 Camera module, 10... Lens unit, 11... Lens barrel part, 12... Reference surface, 13... Positioning pin, 20... Image sensor board, 21... Image sensor, 30... Wiring, 100... Housing, 101... Contact Surface, 102...Positioning hole, 103...Positioning slot, 200...Adjustment jig, 201...Through hole, 202...Abutment surface, 203...V groove for positioning, 204...Plane for positioning, C0...Center collimator, R0... Reticle cross image of central collimator, C1... peripheral collimator, R1... reticle cross image of peripheral collimator

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
PCT/JP2022/027808 2022-07-15 2022-07-15 レンズユニットを有するカメラ装置 Ceased WO2024013969A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024533466A JP7822478B2 (ja) 2022-07-15 2022-07-15 ステレオカメラ
PCT/JP2022/027808 WO2024013969A1 (ja) 2022-07-15 2022-07-15 レンズユニットを有するカメラ装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/027808 WO2024013969A1 (ja) 2022-07-15 2022-07-15 レンズユニットを有するカメラ装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011130061A (ja) * 2009-12-16 2011-06-30 Fujifilm Corp 撮影レンズと撮像素子の位置関係調整方法及び装置、並びにカメラモジュール製造方法及び装置
JP2019012225A (ja) * 2017-06-30 2019-01-24 株式会社デンソー カメラ装置及びカメラ装置の製造方法
JP2019078879A (ja) * 2017-10-24 2019-05-23 日立オートモティブシステムズ株式会社 撮像装置、多眼撮像装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4691508B2 (ja) * 2004-11-15 2011-06-01 日立オートモティブシステムズ株式会社 ステレオカメラ
WO2019093113A1 (ja) * 2017-11-07 2019-05-16 日立オートモティブシステムズ株式会社 車載撮像装置
US20230005976A1 (en) * 2020-01-22 2023-01-05 Hitachi Astemo, Ltd. Imaging device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011130061A (ja) * 2009-12-16 2011-06-30 Fujifilm Corp 撮影レンズと撮像素子の位置関係調整方法及び装置、並びにカメラモジュール製造方法及び装置
JP2019012225A (ja) * 2017-06-30 2019-01-24 株式会社デンソー カメラ装置及びカメラ装置の製造方法
JP2019078879A (ja) * 2017-10-24 2019-05-23 日立オートモティブシステムズ株式会社 撮像装置、多眼撮像装置

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