JP2007047586A - Apparatus and method for adjusting assembly of camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for adjusting the assembly of a camera module, capable of efficiently adjusting the assembly of a lens and a solid-state imaging element, etc. <P>SOLUTION: The assembly adjustment apparatus 30 for a camera module 10 equipped with a plurality of lenses 15 and the solid-state imaging element 18, for adjusting the lenses 15 and the solid-state imaging element 18 related to the camera module 10 includes a lens adjustment means 50 for adjusting light L incident on the lenses 15 and adjusting the lenses 15 in accordance with the optical ring state of the reflected light which is reflected and returned through the lenses 15, and a solid-state imaging element adjustment means 70 for imaging an inspection chart 71 by the solid-state imaging element 18 and adjusting the solid-state imaging element 18 based on the state of the imaged chart image. Thus, it is unnecessary to separately adjust the lens and the solid-state imaging element by the corresponding assembly adjustment apparatuses, and the adjustment can be efficiently performed by one assembly adjustment apparatus. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera module assembly adjustment device and an assembly adjustment method for performing assembly adjustment of a lens and a solid-state imaging device.

  Camera modules mounted on digital cameras, mobile phones, etc. are becoming more advanced, equipped with a solid-state image sensor with a high pixel count of several million pixels to obtain high-quality images, and wide-angle or telephoto shooting. In order to enable this, a drive mechanism for driving a plurality of lenses is provided.

  Specifically, the camera module includes an optical system composed of a plurality of lenses, an image sensor that converts an image formed through the optical system into an electrical signal, and a zoom mechanism that drives the plurality of lenses to enlarge the image. And a focus mechanism for driving the plurality of lenses to focus the image.

  In a camera module equipped with a zoom mechanism, a focus mechanism, and the like, the lens assembly adjustment has a greater influence on the captured image as the functions thereof become more sophisticated. Therefore, in order to sufficiently bring out the functions of the camera module such as wide-angle or telephoto shooting, it is necessary to perform optical adjustment of each lens driven by the zoom mechanism and the focus mechanism and other lenses with high accuracy. Accordingly, various assembling apparatuses have been proposed in order to assemble and adjust the optical system of the camera module with high accuracy.

  FIG. 8 is a schematic configuration diagram showing an example of a conventional compound lens assembly adjusting apparatus. Patent Document 1 discloses a technique for adjusting the position and angle of each lens of the compound lens 110. Here, the light L emitted from the light source 171 is irradiated onto the compound lens 110, the state of the halo of the light L transmitted through each lens is detected by the detector 172, and the position and angle of each lens are determined based on the state of the halo. A lens assembly adjusting device 100 that adjusts by the above is disclosed.

FIG. 9 is a schematic configuration diagram illustrating an example of a conventional lens assembly adjusting device for a camera module. Patent Document 2 discloses a technique for adjusting the position and angle of each lens of a camera module 210 provided with a solid-state image sensor 218. Here, there is disclosed a lens assembly adjusting apparatus 200 that images a chart 251 by a camera module 210 and adjusts the position and angle of each lens by a stage 275 based on the state of the captured image.
JP 2003-114166 A JP 2005-24996 A

  However, in the technique described in Patent Document 1, since the solid-state imaging device is not originally provided in the compound lens, assembly adjustment has to be performed again after the solid-state imaging device is provided. Therefore, a new device for adjusting the solid-state image sensor is necessary, and it takes time to adjust the solid-state image sensor. Moreover, since it is a method of detecting light transmitted through each lens, it could not be applied to a camera module provided with a solid-state imaging device.

  Further, in the technique described in Patent Document 2, for a camera module having a configuration with a small number of lenses and a simple structure that does not involve the operation of the lens, an optical adjustment corresponding to the function can be performed. For functionalized camera modules, optical adjustments corresponding to the functions could not be performed, and it was not possible to sufficiently bring out the performance originally possessed.

  SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and an assembly adjustment device for a camera module that can efficiently perform assembly and adjustment of a lens, a solid-state imaging device, and the like, and that can be performed with high accuracy. It is an object to provide an assembly adjustment method.

  An apparatus for adjusting and assembling a camera module according to the present invention includes a camera module that adjusts the lens and the solid-state image sensor with respect to a camera module including a plurality of lenses and a solid-state image sensor that images through the lenses. Lens adjustment means for adjusting the optical axis by using an interference pattern of reflected light that is reflected after the light passes through the lens after making adjustment light for adjusting the optical axis incident on the lens. And an image adjustment unit that images the chart for image adjustment with the solid-state imaging device and adjusts the solid-state imaging device and the lens according to the state of the image of the captured chart.

  With this configuration, it is not necessary to adjust the lens and the solid-state imaging device with a separate assembly adjustment device, and the adjustment can be performed with a single assembly adjustment device. In other words, by using the reflected light that returns after the adjustment light passes through the lens, the lens adjustment means can be arranged in front of the camera module, and the image adjustment chart is arranged in front of the camera module. Therefore, the lens adjustment unit and the image adjustment unit can be integrated into one apparatus, and the lens adjustment and the image adjustment can be continuously performed.

  The camera module assembly adjustment apparatus according to the present invention is characterized in that a lattice pattern is drawn on the chart.

  With this configuration, since the state change of the lattice pattern can be accurately captured by imaging the chart with the solid-state imaging device, the solid-state imaging device is easily adjusted.

  Also, in the camera module assembly adjustment device according to the present invention, the chart includes a telephoto inspection chart disposed far from the lens and a wide-angle inspection chart disposed close to the lens. It is characterized by that. With this configuration, a wide-angle survey and a telephoto survey can be performed continuously.

  In the camera module assembly adjustment apparatus according to the present invention, the chart is movably arranged so as to be out of the optical path of the adjustment light. With this configuration, it is possible to perform lens adjustment by allowing adjustment light to enter the lens simply by moving the chart. Moreover, since the chart can be returned to a predetermined position, the inspection can be performed under the same conditions at any time.

  In the camera module assembly adjustment apparatus according to the present invention, the chart is provided with a through hole through which the adjustment light passes.

  With this configuration, adjustment light can be incident on the lens without moving the chart, and lens adjustment can be performed. Further, by moving the chart, subtle position fluctuations may occur, and image shift may occur in the captured image. However, since such image shift does not occur when the chart is fixed, Inspection mistakes are eliminated.

  An assembly adjustment method for a camera module according to the present invention is a camera module that adjusts the lens and the solid-state image sensor with respect to a camera module that includes a plurality of lenses and a solid-state image sensor that images through the lenses. A lens adjustment method for adjusting the lens by using an interference pattern of reflected light that is reflected after returning through the lens after making adjustment light for adjusting the optical axis incident on the lens. And an image adjustment step in which an image adjustment chart is picked up by the solid-state image pickup device, and the solid-state image pickup device and the lens are adjusted according to the state of the picked-up image of the chart. .

  With this configuration, the lens and the solid-state imaging device can be adjusted continuously. In other words, by using the reflected light that returns after the adjustment light passes through the lens, the lens adjustment means can be arranged in front of the camera module, and the image adjustment chart is arranged in front of the camera module. Therefore, it is possible to perform lens adjustment and image adjustment continuously with the camera module fixed in one place. For this reason, the assembly adjustment of the camera module can be performed efficiently.

  According to the camera module assembly / adjustment apparatus of the present invention, it is possible to adjust each lens and the solid-state image sensor with one assembly / adjustment apparatus.

  Further, according to the camera module assembly and adjustment apparatus according to the present invention, since the change in the lattice pattern is confirmed, it is easy to adjust the solid-state imaging device.

  Moreover, according to the camera module assembly adjustment apparatus of the present invention, wide-angle adjustment and telephoto adjustment can be performed continuously.

  Further, according to the camera module assembly adjustment apparatus of the present invention, it is possible to perform lens adjustment only by moving the chart.

  Further, according to the camera module assembly adjustment apparatus of the present invention, it is possible to perform lens adjustment without moving the chart.

  According to the assembly adjustment method for a camera module according to the present invention, lens adjustment and solid-state image sensor adjustment can be performed continuously.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
The camera module includes an orthogonal camera module in which the optical axis direction of the solid-state image sensor and the imaging direction coincide with each other, and a bent camera module in which the optical axis direction of the solid-state image sensor and the imaging direction are perpendicular.

  In the first embodiment, an assembly adjustment apparatus for a direct camera module will be described. First, a direct camera module will be described with reference to FIG.

  FIG. 1 is a schematic configuration diagram of a direct camera module. The camera module 10 includes an optical system including a plurality of lenses 15 and a solid-state image sensor 18 that converts an image formed into an electric signal. The solid-state image sensor 18 is provided at the bottom of the housing 19, and an optical system is disposed in front of it.

  The casing 19 is made of a resin such as ABS resin, polycarbonate resin, or liquid crystal polymer, and is manufactured by processing such as molding or cutting. Since the size of the housing 19 of the camera module 10 is restricted by the size of the electronic device to be mounted, the size of the optical system and the solid-state image sensor 18 is also restricted. Therefore, the optical system housed inside the housing 19 is designed to be large enough to fit inside the housing 19, and how the lens 15 is driven in the camera module 10 having a wide-angle or telephoto function. Also, the subject image is designed to be within the light receiving range of the solid-state imaging device 18.

  The optical system includes a focus optical system 11 having a function of focusing on a subject, a zoom optical system 12 having a function of scaling an image, and an adjustment lens 13 that adjusts an image formed on the solid-state image sensor 18. It consists of and. Each optical system is disposed in the order of the solid-state imaging device 18, the adjustment lens 13, the zoom optical system 12, and the focus optical system 11.

  The focus optical system 11 and the zoom optical system 12 are composed of a plurality of lenses 15, and each lens 15 constituting each optical system is adjusted so as to suppress the amount of eccentricity, and an adhesive (for example, ultraviolet curing) The lens holder 16 is fixed by a type of adhesive or the like. Each lens 15 has a spherical shape or an aspherical shape, and is produced by cutting or molding with a material such as glass or plastic as necessary.

  The lens 15 fixed to the lens holder 16 is configured to be able to slide independently along the optical axis J of the camera module 10 by a driving mechanism provided outside the camera module. Specifically, the power of a stepping motor or the like provided outside the camera module 10 is transmitted to the lens holder 16 by a cam, a wire, or the like to drive the lens 15.

  The solid-state image sensor 18 converts optical information imaged on the solid-state image sensor 18 into an electrical signal. For example, the CCD (Charge Coupled Devices, the same applies hereinafter) or CMOS (Complementary Metal Oxide Semiconductor, the same applies hereinafter). A combination of the light receiving element and the light receiving element is used as the solid-state imaging element 18.

  Next, the configuration of the assembly adjustment apparatus for the direct camera module 10 will be described.

  FIG. 2 is a schematic configuration diagram of an assembly adjustment apparatus for a direct camera module. The assembly adjustment device 30 of the direct camera module 10 includes a lens adjustment unit 50 that adjusts the optical axes of the focus optical system 11 and the zoom optical system 12, and an image adjustment unit 70 that adjusts the position and angle of the solid-state imaging device 18. And is used when the lens 15, the solid-state image sensor 18 and the like are incorporated in the housing 19, and adjusts the position and angle of the lens 15, the solid-state image sensor 18 and the like.

  The lens adjustment unit 50 includes a light source unit 51 that emits adjustment light L for adjusting the optical axis, a detection unit 52 that detects reflected light that is reflected by the adjustment light L incident on the optical system, and the position of the lens 15. The lens adjustment unit 55 adjusts the angle. The position and angle of the lens 15 of the focus optical system 11 and the lens 15 of the zoom optical system 12 are adjusted by the lens adjusting unit 50.

  The light source unit 51 emits light having directivity. The light emitted from the light source unit 51 is applied to the optical system of the camera module 10 as the adjustment light L. As the light source of the light source unit 51, for example, a light source having directivity such as a semiconductor laser or a He—Ne laser is used. Note that a halogen lamp or the like having no directivity may be used. In this case, a light source having directivity is provided by providing a pinhole in front of the light source. The adjustment light L is applied to the camera module 10, passes through the focus optical system 11 and the zoom optical system 12, and is regularly reflected by an optical flat (not shown). The optical flat is a component having a flat surface that reflects light without scattering, and is, for example, a flat protective glass provided on the front surface of the solid-state imaging device 18.

  The detector 52 includes a beam splitter 52a that reflects the reflected light of the adjustment light L at a substantially right angle, and a detector 52b that includes a detection element (for example, an image sensor) that detects the adjustment light L reflected by the beam splitter 52a. It is configured. The beam splitter 52a is disposed in front of the light source unit 51, and is disposed so as to transmit the adjustment light L and reflect light reflected from the camera module 10 at a right angle.

  Since the adjustment light L passes through the focus optical system 11 and the zoom optical system 12 and is reflected back by the optical flat, the state of the interference pattern reflected on the detector 52b is confirmed, so that the focus optical system 11 and The degree of eccentricity of the lens 15 constituting the zoom optical system 12 can be grasped.

  The lens adjustment unit 55 includes a focus lens adjustment unit 55a and a zoom lens adjustment unit 55b. The focus lens adjustment unit 55a adjusts the position and angle of the lens 15 based on the state of the interference pattern of the adjustment light L when the lens 15 constituting the focus optical system 11 is assembled. The zoom lens adjustment unit 55b adjusts the position and angle of the lens 15 based on the state of the interference pattern of the adjustment light L when the lens 15 constituting the zoom optical system 12 is assembled. The focus lens adjustment unit 55a or the zoom lens adjustment unit 55b includes a position adjustment unit (not shown) for moving the lens 15 in the same direction as the optical axis or a direction perpendicular to the optical axis, and an angle adjustment unit (not shown) for adjusting the angle of the lens 15. As a result, the lens 15 can be assembled and adjusted to an optimum state.

  The image adjusting unit 70 includes a chart 71 that is picked up to adjust an image, and an image adjusting unit 75 that adjusts the positions and angles of the adjusting lens 13 and the solid-state image pickup device 18 according to the state of the picked-up image. . The positions and angles of the adjustment lens 13 and the solid-state image sensor 18 are adjusted by the image adjustment unit 70.

  FIG. 3 is a front view of the chart. The chart 71 has a flat sheet shape and is arranged in front of the camera module 10. On the surface side facing the direction of the camera module 10, a pattern to be imaged by the camera module 10 is drawn. One chart 71 is arranged at a position away from the camera module 10, and one chart 71 is arranged at a close position.

  A chart 71 arranged at a position (distant) away from the camera module 10 is a telephoto chart 71a that is imaged in the telephoto shooting state. By taking an image of the telephoto chart 71a and assembling and adjusting the adjustment lens 13, the solid-state imaging device 18 and the like, it is possible to reduce blurring of the image when setting the telephoto shooting state.

  A chart 71 arranged in the vicinity of the camera module 10 is a wide-angle chart 71b that is imaged in the wide-angle shooting state. By imaging the wide-angle chart 71b and assembling and adjusting the adjustment lens 13, the solid-state imaging device 18, and the like, it is possible to reduce blurring of the image when setting the wide-angle imaging state.

  For example, a lattice pattern is drawn on the chart 71. By capturing the chart 71 on which a lattice-like pattern is drawn, it is possible to easily grasp the degree of blurring in the peripheral area of the image, so that it is easy to adjust image blurring.

  Further, since the lattice pattern can easily grasp the distortion of the image, it is easy to adjust the distortion. For example, even if the image adjustment means 70 adjusts the inclination of the solid-state imaging device 18 and optimizes blurring in the periphery of the image, the entire image may be distorted (distortion). At this time, if the pattern of the chart 71 to be imaged is inappropriate, distortion may be missed, but if the chart 71 on which a lattice-like pattern is drawn is used, image distortion is easy. Therefore, it is possible to appropriately adjust the image without missing the distortion of the image due to the distortion.

  The telephoto chart 71a and the wide-angle chart 71b are preferably provided between the light source unit 51 and the camera module 10. When adjusting the image blur of the peripheral area using the chart 71, if there is a shielding object (for example, the light source unit 51) between the camera module 10 and the chart 71, the chart 71 is not properly focused. This is because the displayed image itself may be blurred.

  In this case, since the adjustment light L emitted from the light source unit 51 is blocked by the chart 71 and does not reach the camera module 10, a through hole 71 h through which the adjustment light L passes is provided in each chart 71.

  Alternatively, the chart 71 may be movably provided so as to avoid the optical path of the adjustment light L. In this case, it is preferable to move the chart 71 along the guide so that the chart arrangement does not change each time the chart 71 is moved. Thereby, since the position change of the image imaged by the movement of the chart 71 is suppressed, assembly adjustment of the adjustment lens 13 and the solid-state image sensor 18 etc. can always be performed on the same conditions.

  The image adjustment unit 75 includes an adjustment lens adjustment unit 75a and a solid-state image sensor adjustment unit 75b. The adjustment lens adjustment unit 75 a adjusts the position and angle of the adjustment lens 13 based on the image state of the captured chart 71 when adjusting the adjustment lens 13 incorporated in the housing 19. The solid-state image sensor adjustment unit 75 b adjusts the position and angle of the solid-state image sensor 18 based on the image state of the captured chart 71 when adjusting the solid-state image sensor 18 incorporated in the housing 19. The adjustment lens adjustment unit 75a includes a position adjustment unit (not shown) that moves the lens 15 in the same direction as the optical axis or a direction perpendicular to the optical axis, and an angle adjustment unit (not shown) that adjusts the angle of the lens 15. Thereby, the lens 15 can be arranged in an optimum state. The solid-state image sensor adjustment unit 75b includes a position adjustment unit (not shown) that adjusts the position of the solid-state image sensor 18, and an angle adjustment unit (not shown) that adjusts the angle. Can be placed in any state.

  With this configuration, since the optical axes of the lens 15 and the solid-state image sensor 18 can be easily adjusted in the assembly of the orthogonal camera module 10, the assembly production efficiency of the camera module 10 is improved.

<Embodiment 2>
Next, a method for assembling and adjusting the direct camera module will be described with reference to FIGS.

  FIG. 4 is an assembly adjustment process diagram of the assembly adjustment method of the direct camera module. The assembly adjustment of the camera module 10 includes an optical axis setting step (S1) for setting the optical axis J of the camera module 10, a focus optical system 11, a zoom optical system 12, and an adjustment lens 13 with respect to the optical axis J of the camera module 10. The optical axis adjustment step (S2 to S6) for aligning the optical axes of the solid image pickup device 18 and the image adjustment step (S7 to S11) for adjusting the position and angle of the solid-state imaging device 18 and the adjustment lens 13 while confirming the captured image.

  The optical axis setting step (S1) is a step of setting a reference optical axis that serves as a reference when assembling optical components such as the lens 15 constituting the optical system. First, in the assembly adjustment device 30 of the camera module 10, the reference optical axis is set so that the adjustment light L passes through a predetermined optical path (S1). Specifically, the adjustment light L of the light source unit 51 is generated from a predetermined position and irradiated on a reflection plate (a mirror perpendicular to the adjustment light L) (not shown), and the reflected light reflected from the reflection plate is beam splitter 52a. Is set so as to be reflected at a right angle and to return to a predetermined position of the detection unit 52. As a result, the optical path of the adjustment light L is set as a reference optical axis that serves as a reference for the arrangement of the optical components (solid-state imaging device 18, lens 15 and the like) of the camera module 10.

  In the optical axis adjustment step (S2 to S6), the optical axes of the solid-state imaging device 18, the lens 15 constituting the focus optical system 11, the lens 15 constituting the zoom optical system 12, and the adjustment lens 13 coincide with the reference optical axis. Adjust as follows.

  First, the solid-state image sensor 18 is arranged by adjusting the center position and angle of the solid-state image sensor 18 (S2). Specifically, the solid-state imaging device 18 is arranged so that the adjustment light L is perpendicularly incident on the center of the light receiving surface. As a result, the optical axis of the solid-state imaging device 18 matches the reference optical axis.

  Next, the lens 15 constituting the focus optical system 11, the lens 15 constituting the zoom optical system 12, and the adjustment lens 13 are incorporated with respect to the reference optical axis. At this time, adjustment of the focus optical system 11 (S3), adjustment of the zoom optical system 12 (S4), and adjustment of the adjustment lens 13 (S5) are performed. Here, the position of each lens 15 is such that the transmitted light that passes through the lens 15 of each optical system is located at the center of the solid-state imaging device 18 and the reflected light returning to the detection unit 52 is located at a predetermined position. Adjust the angle. Further, the position and angle of the lens 15 of each optical system are adjusted so that the interference pattern of the reflected light detected by the detector 52b is evenly concentrically. That is, the transmitted light is reflected by an optical flat surface (not shown) (for example, protective glass of the solid-state imaging device 18), reflected at a right angle by the beam splitter 52a, and detected by the detector 52b (CCD camera or the like). Since the interference pattern of the reflected light detected by the detector 52b is distorted due to the inclination of the lens 15 through which the light is transmitted, each lens 15 is adjusted so that the distortion of the interference pattern is eliminated. The optical system can be arranged in an optimal state.

  Further, in the focus optical system 11 and the zoom optical system 12, the lens 15 constituting each optical system is driven to check whether the position of the spot irradiated with the transmitted light on the solid-state image sensor 18 has changed. In this case, the position and angle of each lens 15 are adjusted. Further, it is confirmed whether or not the position, shape, and interference pattern of the reflected light spot detected by the detector 52b are changed. If they are changed, the position and angle of each lens 15 are adjusted (S3: NO, S4). : NO). That is, the position and angle of the lens 15 are adjusted so that the optical path of the reference optical axis does not change even when the lens 15 of the focus optical system 11 or the zoom optical system 12 is driven.

  Further, the adjustment of the position and the angle is performed when the adjustment lens 13 is incorporated, but the adjustment may be performed again after the adjustment of the focus optical system 11 and the zoom optical system 12.

  In the assembly adjustment process diagram of FIG. 4, the adjustment is performed in the order of adjustment of the focus optical system 11 (S3), adjustment of the zoom optical system 12 (S4), and adjustment of the adjustment lens 13 (S5). However, any of the adjustment of the focus optical system 11 (S3), the adjustment of the zoom optical system 12 (S4), or the adjustment of the adjustment lens 13 (S5) may be performed first.

  Further, after the adjustment of the lenses 15 constituting the zoom optical system 12 and the focus optical system 11 is completed, each lens 15 is fixed to the lens holder 16 with an adhesive (for example, an ultraviolet curing adhesive) or the like (S6). . At this time, since the position and angle of the lens 15 may be shifted due to the curing of the adhesive, it is confirmed that the spot position / interference pattern of transmitted light or reflected light is not changed.

  In the image adjustment process (S7 to S11), the adjustment lens 13 and the solid-state imaging device 18 are adjusted by imaging the chart 71 for inspection with the camera module 10 and confirming the state of the captured image. Although the image is optimized on the reference optical axis by adjusting the focus optical system 11, the zoom optical system 12, and the adjustment lens 13, the image is partially blurred in the peripheral area of the reference optical axis. In order to adjust the image, the adjustment lens 13 and the solid-state image sensor 18 are adjusted. Therefore, in order to confirm the imaging state of the peripheral area of the reference optical axis, the blur and distortion of the peripheral area of the image captured by imaging the chart 71 on which a grid pattern having a predetermined area is drawn are confirmed. By doing so, the adjustment lens 13 or the solid-state imaging device 18 is adjusted.

  In the camera module 10 having a zoom function, the zoom optical system 12 is set to the wide-angle shooting state, the wide-angle inspection chart 71b is picked up, and the picked-up image is confirmed to check the adjustment lens 13 or the solid-state image pickup. The element 18 is adjusted. Further, the adjustment lens 13 or the solid-state image sensor 18 is adjusted by setting the zoom optical system 12 to the telephoto imaging state, imaging the telephoto inspection chart 71a, and confirming the captured image. That is, in the camera module 10 having a zoom function, the image captured in the telephoto state or the wide-angle state may be deteriorated compared to the image captured in the normal state. And the adjustment lens 13 or the solid-state imaging device 18 is adjusted.

  In the image adjustment when the wide-angle shooting state is set, first, the zoom optical system 12 is set to the wide-angle shooting state, the wide-angle inspection chart 71b is disposed in front of the camera module 10, and the wide-angle inspection chart 71b is imaged. While confirming the state of the image, the adjustment lens 13 or the solid-state imaging device 18 is adjusted so that the image in the surrounding area is free from blurring and distortion (S7). After the adjustment, the wide-angle inspection chart 71b is picked up again to check whether the problem of the image has been solved (S8). When the problem is solved (S8: YES), the process proceeds to the next operation. If the problem of the image is not solved (S8: NO), the adjustment lens 13 or the solid-state image sensor 18 is adjusted again.

  In the image adjustment when the telephoto shooting state is set, first, the zoom optical system 12 is set to the telephoto shooting state, the telescopic inspection chart 71a is disposed far from the camera module 10, and the telephoto inspection chart 71a is imaged. While confirming the image, the adjustment lens 13 or the solid-state image sensor 18 is adjusted so as to obtain an image without blurring or distortion of the peripheral region (S9). After the adjustment, the telescopic inspection chart 71a is imaged again to check whether the problem of the image has been solved (S10), and when it has been solved (S10: YES), the process proceeds to the next operation. When the problem of the image is not solved (S10: NO), the adjustment lens 13 or the solid-state image sensor 18 is adjusted again.

  Next, the adjustment lens 13 and the solid-state imaging device 18 are fixed to the lens holder 16 or the housing 19 of the camera module 10 with an adhesive (for example, an ultraviolet curable adhesive) or the like (S11).

  In the assembly adjustment process diagram of FIG. 4, the adjustment lens 13 is adjusted, and then the solid-state imaging device 18 is adjusted. Any adjustment may be performed first. Either the image adjustment in the wide-angle shooting state or the image adjustment in the telephoto shooting state may be performed first.

<Embodiment 3>
In the third embodiment, an assembly adjustment apparatus for a bent camera module will be described.

  First, a bending type camera module will be described with reference to FIG. FIG. 5 is a schematic configuration diagram of a bent camera module. The camera module 10 includes a bending optical system 21 that bends the optical axis in the imaging direction at a right angle, an optical system that includes a plurality of lenses 15, and a solid-state imaging device 18 that converts an image formed into an electrical signal. Has been. The solid-state imaging device 18 is provided at the bottom of the housing 19, an optical system that forms an image of the subject on the solid-state imaging device 18 is disposed in front of the solid-state imaging device 18, and a bending optical system 21 is provided in front of the optical system.

  Since the structure of the housing | casing 19, an optical system, and the solid-state image sensor 18 is the same as that of Embodiment 1, it attaches | subjects the same code | symbol and abbreviate | omits the description.

  The bending optical system 21 has a mirror 22 that changes the direction of the optical axis by approximately 90 degrees. Thereby, the reflected light from the subject is guided to the solid-state imaging device 18 through the optical system after being changed in direction by approximately 90 degrees. Therefore, imaging in a direction perpendicular to the optical axis direction of the solid-state imaging element 18 can be performed.

  Specifically, the bendable camera module 10 is mounted on a mobile phone or a thin camera having a limitation in the thickness direction. The highly functional camera module 10 has a large optical system due to the combination of a plurality of lenses 15, and accordingly, the thickness increases in the imaging direction and cannot be mounted on a thin electronic device. Since the optical system is arranged perpendicular to the imaging direction and the thickness does not increase in the imaging direction, the camera module 10 can be mounted on a thin electronic device.

  Next, the configuration of the assembly adjustment apparatus for the bent camera module 10 will be described.

  FIG. 6 is a schematic configuration diagram of an assembling and adjusting apparatus for a bent camera module. The assembly adjustment device 30 of the bending type camera module 10 adjusts the position and angle of the solid-state imaging device 18 and the lens adjustment unit 50 that adjusts the optical axes of the bending optical system 21, the focus optical system 11, and the zoom optical system 12. And an image adjusting unit 70, which is used when the mirror 22, the lens 15, the solid-state image sensor 18 and the like are incorporated in the housing 19, and adjusts the position and angle of the mirror 22, the lens 15, the solid-state image sensor 18 and the like. Is.

  The lens adjustment means 50 includes a light source unit 51 that emits adjustment light L for adjusting the optical axis, a detection unit 52 that detects reflected light that is reflected when the adjustment light L enters the optical system, and the mirror 22. The lens 15 includes a lens adjustment unit 55 that adjusts the position and angle of the lens 15. The position and angle of the lens 15 of the zoom optical system 12, the lens 15 of the focus optical system 11, the mirror 22 of the bending optical system 21 and the like are adjusted by the lens adjusting unit 50.

  Since the light source unit 51 and the detection unit 52 have the same configuration as in the first embodiment, description thereof is omitted.

  The lens adjustment unit 55 includes a mirror adjustment unit 55c, a focus lens adjustment unit 55a, and a zoom lens adjustment unit 55b. The mirror adjustment unit 55c adjusts the position and angle of the mirror 22 based on the reflection return position of the adjustment light L when the mirror 22 constituting the bending optical system 21 is assembled. The focus lens adjustment unit 55a adjusts the position and angle of the lens 15 based on the state of the interference pattern of the adjustment light L when the lens 15 constituting the focus optical system 11 is assembled. The zoom lens adjustment unit 55b adjusts the position and angle of the lens 15 based on the state of the interference pattern of the adjustment light L when the lens 15 constituting the zoom optical system 12 is assembled.

  The mirror adjuster 55c includes a position adjuster (not shown) that moves the position of the mirror 22, and an angle adjuster (not shown) that adjusts the tilt of the mirror 22, whereby the mirror 22 is used as a reference optical axis. On the other hand, it can be placed in an appropriate state. The focus lens adjustment unit 55a or the zoom lens adjustment unit 55b includes a position adjustment unit (not shown) for moving the lens 15 in the same direction as the optical axis or a direction perpendicular to the optical axis, and an angle adjustment unit (not shown) for adjusting the angle of the lens 15. As a result, the lens 15 can be arranged in an optimum state.

  The image adjusting means 70 adjusts the positions and angles of the adjusting lens 13 and the solid-state imaging device 18 of the camera module 10 while checking the state of the image on the chart 71, and the configuration is the same as in the first embodiment. Description is omitted.

  With this configuration, the optical axis of the mirror 22, the lens 15, and the solid-state image sensor 18 can be easily adjusted in the assembly of the bent camera module 10, so that the assembly production efficiency of the camera module 10 is improved.

<Embodiment 4>
Next, a method for assembling and adjusting the bent camera module will be described with reference to FIGS.

  FIG. 7 is an assembly adjustment process diagram of the bending camera module assembly adjustment method. The assembly adjustment of the camera module 10 includes an optical axis setting step (S1) for setting the optical axis J of the camera module 10, a bending optical system 21, a focus optical system 11, and a zoom optical system 12 with respect to the optical axis J of the camera module 10. And an optical axis adjustment step (S2A to S6) for aligning the optical axis of the adjustment lens 13, and an image adjustment step (S7 to S6) for adjusting the positions and angles of the solid-state imaging device 18 and the adjustment lens 13 while confirming the captured image. S11). Since the optical axis adjustment step and the image adjustment step are the same as the assembly adjustment method of the camera module 10 according to Embodiment 1, description thereof is omitted.

  The optical axis setting step (S1) is a step of setting a reference optical axis that serves as a reference when assembling optical components such as the lens 15 constituting the optical system. First, in the assembly adjustment device 30 of the camera module 10, the reference optical axis is set so that the adjustment light L passes through a predetermined optical path (S1). Specifically, the adjustment light L of the light source unit 51 is generated from a predetermined position, irradiated to a first reflector (not shown) (a mirror perpendicular to the adjustment light L), and the reflected light reflected from the reflector is a beam. It is set so that the light is reflected at a right angle by the splitter 52a and irradiated to a predetermined position of the detection unit 52. As a result, the optical path of the adjustment light L is set as a reference optical axis that serves as a reference for the arrangement of the optical components (solid-state imaging device 18, lens 15 and the like) of the camera module 10.

  In the optical axis adjustment step (S2A to S6), the bending optical system 21, the solid-state imaging device 18, the lens 15 constituting the focus optical system 11, the lens 15 constituting the zoom optical system 12, and the optical axis of the adjustment lens 13 are used as a reference. Adjust to match the optical axis.

  First, the bending optical system 21 is arranged by adjusting the position and angle of the mirror 22 of the bending optical system 21 with respect to the reference optical axis (S1B). Specifically, the bending optical system 21 is arranged, the reflected light reflected by the mirror 22 from the adjustment light L emitted from the light source unit 51 is irradiated to a second reflector (not shown) (mirror perpendicular to the adjustment light L), and the first The reflected light reflected from the two reflecting plates is reflected by the beam splitter 52a through the mirror 22 at a right angle so as to be irradiated to a predetermined position of the detection unit 52. The second reflecting plate is disposed at a position perpendicular to the bending optical system 21 disposed on the reference optical axis, and regularly reflects the reflected light reflected from the bending optical system 21 at a right angle. That is, the second reflecting plate is for confirming whether or not the bending optical system 21 accurately reflects the adjustment light L in the direction of 90 degrees.

  When the mirror 22 of the bending optical system 21 is fixed to the housing 19 of the camera module 10 first, the housing 19 can be arranged in accordance with the reference optical axis. However, in this case, since the mirror 22 is not necessarily disposed at 45 degrees with respect to the main axis of the housing 19, the housing 19 may be disposed obliquely with respect to the reference optical axis. Subsequent arrangement of the lens 15 and the like is arranged obliquely with respect to the main axis of the casing 19 as a whole, and the main axis of the casing 19 and the reference optical axis of the optical system are shifted. In addition, when the main axis of the housing 19 and the reference optical axis of the optical system are deviated, there is a limit to the arrangement adjustment of the lens 15 and the optical system cannot be adjusted sufficiently. Therefore, it is preferable that the bending mirror 22 be arranged and adjusted with respect to the reference optical axis before being fixed to the housing 19.

  Note that the optical axis adjustment steps (S2B to S6) of the solid-state imaging element 18, the focus optical system 11, the zoom optical system 12, and the adjustment lens 13 are the same as those in the first embodiment, and thus the description thereof is omitted. In addition, the image adjustment process (S7 to S11) is the same as that in the first embodiment, and thus the description thereof is omitted.

It is a schematic block diagram of a direct type camera module. It is a schematic block diagram of the assembly adjustment apparatus of a direct type camera module. It is a front view of a chart. FIG. 4 is an assembly adjustment process diagram of an assembly type adjustment method for a direct camera module. It is a schematic block diagram of a bending type camera module. It is a schematic block diagram of the assembly adjustment apparatus of a bending type camera module. FIG. 6 is an assembly adjustment process diagram of the bending camera module assembly adjustment method. It is a schematic block diagram which shows an example of the conventional compound lens assembly adjustment apparatus. It is a schematic block diagram which shows an example of the lens assembly adjustment apparatus of the conventional camera module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera module 13 Adjustment lens 15 Lens 18 Solid-state image sensor 30 Assembly adjustment apparatus 50 Lens adjustment means 70 Image adjustment means 71 Chart 71a Telephoto inspection chart 71b Wide-angle inspection chart 71h Through-hole L Adjustment light

Claims (6)

An assembly adjustment device for a camera module that adjusts the lens and the solid-state imaging device with respect to a camera module including a plurality of lenses and a solid-state imaging device that images through the lenses,
Lens adjustment means for adjusting the optical axis by using an interference pattern of reflected light that is incident after the adjustment light for adjusting the optical axis is incident on the lens and passes through the lens and then returns, and an image adjustment chart And an image adjusting means for adjusting the solid-state imaging device and the lens according to the state of the image of the chart that has been picked up by the solid-state imaging device.   The camera module assembly adjustment apparatus according to claim 1, wherein a lattice pattern is drawn on the chart.   3. The chart according to claim 1, wherein the chart includes a telephoto inspection chart disposed far from the lens and a wide-angle inspection chart disposed close to the lens. Camera module assembly adjustment device.   The camera module assembling and adjusting apparatus according to any one of claims 1 to 3, wherein the chart is movably arranged so as to deviate from the optical path of the adjusting light.   The camera module assembling and adjusting device according to any one of claims 1 to 3, wherein the chart is provided with a through-hole through which the adjustment light passes. An assembly adjustment method for a camera module that adjusts the lens and the solid-state image sensor with respect to a camera module including a plurality of lenses and a solid-state image sensor that images through the lenses,
A lens adjustment process for adjusting the lens by using an interference pattern of reflected light that is reflected after the light is incident on the lens and is reflected after passing through the lens. An image adjustment step of imaging a chart with the solid-state imaging device and adjusting the solid-state imaging device and the lens according to the state of an image of the captured chart.

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