JP2019078941A - Camera module adjustment apparatus and adjustment method thereof - Google Patents

Abstract

To provide an adjustment apparatus of a camera module in which apparatus space saving is performed by using a light source unit such that camera module adjustment can be performed equally to a scheme using a test chart even when a distance between the test chart and the camera module is large.SOLUTION: A light source unit 11 comprises: a light source 11a; a diffuser panel 11b that emits light injected from the light source 11a as diffusion light; a chart 11c that converts the diffusion light to a test pattern to emit; and a collimator lens 11d that converts the test pattern to infinite distance parallel light to emit. An inspection camera module comprises: an inspection lens system; and an inspection imaging device. The parallel light is image-formed on a light-receiving surface of the inspection imaging device by the inspection lens system, the image-formed light is converted to an electrical signal by the inspection imaging device, and a first physical relationship between the inspection lens system and the imaging device is adjusted according to the electrical signal.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a camera module adjustment device. Also, more specifically, when the reference chart (hereinafter referred to as a reference chart, for example, a reflection chart) used to adjust the camera module is separated from the camera module by a large distance. However, the present invention relates to an improved camera module adjustment device and its adjustment method that can save space by using a light source unit capable of adjusting a camera module as well as a method using a reference chart.

  In recent years, the mounting rate of mobile phone or smartphone camera modules has been rapidly increasing, and the production volume has been increasing. Since this camera module is used for a mobile phone or a smartphone, it is basically small and thin, and has a feature that the lens outer shape is extremely small as compared with a normal camera such as a 35 mm camera. With such background, the lens unit also has high performance, linked to the increase in the number of pixels of the image sensor (for example, Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (CMOS)) used in the camera module. The one with high function (AF (Auto Focus), zoom, etc.) is used. Then, it is required that the image is not blurred not only at infinity but also at a plurality of imaging distances at a finite distance. For this reason, it has been required that the high resolution chart be taken apart from the camera module to be inspected and the distance between the lens unit and the imaging device in the camera module be adjusted.

  Conventionally, in the focus adjustment of the camera module, the chart is photographed by the camera module, and the distance between the lens system in the camera module and the imaging element is adjusted so as to focus on the photographed image. FIG. 1 is a diagram showing a method of focus adjustment of a conventional camera module. The reference chart 106 is photographed using the camera module 102, and the distance or positional relationship between the lens system 102a and the imaging element 102b is adjusted based on the photographed image.

  Japanese Patent Application Laid-Open No. 2005-024996 (Patent Document 1) discloses a technique for adjusting the position and angle of each lens of a camera module provided with a solid-state imaging device. Here, a lens assembly adjustment device is disclosed which captures a chart by a camera module and adjusts the position and angle of each lens by a stage based on the state of the captured image.

  In JP 2007-047586 A (patent document 2), adjustment light for adjusting the optical axis is made to be incident on the lens with respect to a camera module provided with a solid-state imaging device that picks up an image through a plurality of lenses, Optical axis adjustment is performed using the interference pattern of the reflected light reflected back after passing through, the chart for image adjustment is imaged by the solid-state imaging device, and the solid-state imaging device and the image condition of the imaged chart There is disclosed an assembly adjustment device for a camera module that can be adjusted by one assembly adjustment device without the need for adjusting the lens and the solid-state image sensor with separate assembly adjustment devices by adjusting the lens. .

  JP-A-2009-213008 (Patent Document 3) includes a test chart for solid-state imaging device having a circular or concentric annular chart figure of lightness different from the background, and uses MTF (Modulation Transfer Function) method Calculation of the resolution, so that the chart figure is arranged at a predetermined position previously defined by the limited liability intermediate corporation camera image equipment industry association (CIPA) within the viewing angle range of the imaging device. A test chart for performing an image quality test of a solid-state imaging device capable of miniaturizing the test chart and its use, a chart board, and a test apparatus are disclosed because it is not necessary to install a test chart on the test chart.

  In JP-A-2014-155063 (patent document 4), a striped pattern-like pattern resolution measurement in which a black linear pattern and a white linear pattern are alternately arranged over the entire plane of the resolution measurement chart. By using the chart for measuring the resolution of the camera module, it becomes possible to measure the resolution by image height (for example, spatial frequency response (Special Frequency Response)) at fixed coordinates, such as mobile phones and smartphones. Technology to shorten the manufacturing time of the adjustment camera module by measuring the positional relationship between the lens unit and the imaging sensor at high speed in a camera module mounted on a small electronic device (resolution measurement method, position adjustment method in camera module, and camera module Manufacturing method) is disclosed.

  JP-A-2013-007971 (Patent Document 5) discloses a general camera module focus adjustment device. A block diagram showing a schematic configuration of the focus adjustment device is shown in FIG.

  As FIG. 2 shows, the focus adjustment apparatus 1 is provided with the camera module 2, the socket board 3, the personal computer 4, the chart 6, and the focus lens drive device 7. Moreover, the personal computer 4 has the detection part 4a and the calculating part 4b. These functional blocks formed in the personal computer 4 with the focus adjustment unit 4c are formed by executing the focus adjustment program on the personal computer 4, and the captured image data captured by the individual imaging element of the camera module 2 is It is disclosed that the focus is transferred from the socket board 3 to the detection unit 4a of the personal computer 4, and the operation unit 4b and the focus adjustment unit 4c perform focus adjustment based on captured image data.

JP 2005-024996 A Japanese Patent Application Publication No. 2007-047586 JP, 2009-213008, A Unexamined-Japanese-Patent No. 2014-155063 JP, 2013-007971, A

  As in the conventional adjustment device, in the method in which the chart is separated from the camera module, the chart is photographed by the camera module, and the camera module is adjusted, the camera module adjustment device itself is enlarged in size according to the distance. There is a problem.

  Such problems can not be solved even with the techniques disclosed in Patent Documents 1 to 5.

  For example, in the lens assembly adjustment device described in Patent Document 1, when the area of the imaging chart increases as the resolution of the imaging chart increases, a technique for reducing the distance between the imaging chart and the camera unit is viewed. I can not.

  Furthermore, a camera module assembly adjustment apparatus described in Patent Document 2, a test chart for performing an image quality test of a solid-state imaging device described in Patent Document 3, and a test apparatus using the test chart, Patent Document 4 Also in the position adjustment method in the camera module and the focus adjustment device described in Patent Document 5, there is not found any technique for shortening the distance between the photographing chart and the camera unit.

  The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is equivalent to a method using a test chart even when the distance between the test chart and the camera module is greatly separated. It is an object of the present invention to provide a camera module adjustment device which achieves space saving by using a light source unit capable of performing camera module adjustment.

  The above object of the camera module adjustment device according to the present invention is a camera module adjustment device having a light source unit and an inspection camera module, wherein the light source unit uses a light source and light incident from the light source as diffused light The camera module includes: a diffusion plate to be emitted; a chart for converting the diffused light into a test pattern and emitting the test pattern; and a collimator lens for converting the test pattern into parallel light of infinite distance and emitting the light; A system and an inspection imaging device, the parallel light is imaged on the light receiving surface of the inspection imaging device by the inspection lens system, and the imaged light is converted into an electric signal by the inspection imaging device. This is achieved by adjusting a first positional relationship between the lens system and the imaging device according to the electrical signal.

  The object of the camera module adjustment device according to the present invention is to adjust a second positional relationship between the reference lens system of the reference camera module and the reference image sensor using the reflection type reference chart, and to adjust the second position. Adjusting the third positional relationship between the diffusion plate and the collimator lens by using the reference camera module whose relationship is adjusted, or adjusting the second positional relationship and the third positional relationship The first resolution of the reference camera module and the second resolution of the camera module are equalized by adjustment, or the chart is of a transmissive type that controls the transmittance of the diffused light Or the chart is a mask or reticle for semiconductor processing, or the light source is a light emitting diode, Ri is effectively achieved.

Further, the above object of the camera module adjustment method according to the present invention is a camera module adjustment method having a light source unit and an inspection camera module, and using the light source unit, a diffusion plate, a light source and the light source The step of emitting incident light as diffused light, the step of converting the diffused light into a test pattern and emission according to a chart, and the collimator lens converting the test pattern into parallel light of infinite distance for emission The collimated light is imaged on the light receiving surface of the inspection imaging device by the inspection lens system included in the camera module, and the imaged light is processed by the inspection imaging device included in the camera module Converted to an electrical signal by the inspection imaging device;
Adjusting the first positional relationship between the lens system and the imaging device in accordance with the electrical signal.

  In the camera module adjustment method according to the present invention, the second position relationship between the reference lens system of the reference camera module and the reference image sensor is adjusted using the reflection type reference chart, and the second position Adjusting the third positional relationship between the diffusion plate and the collimator lens by using the reference camera module whose relationship is adjusted, or adjusting the second positional relationship and the third positional relationship The first resolution of the reference camera module and the second resolution of the camera module are equalized by adjustment, or the chart is of a transmissive type that controls the transmittance of the diffused light Or the chart is a mask or reticle for semiconductor processing, or the light source is a light emitting diode, Ri is effectively achieved.

The above object of a program for causing a computer to execute camera module adjustment according to the present invention is a program for causing a computer to execute camera module adjustment having a light source unit and an inspection camera module,
Using the light source unit, a light source, a step of emitting the light incident from the light source as diffused light by the diffusion plate, a step of converting the diffused light into a test pattern and emitting the light by the chart, a collimator lens And converting the test pattern into parallel light at infinity and emitting the parallel light, and the parallel light is imaged on the light receiving surface of the inspection image pickup device by the inspection lens system provided in the camera module; A step of converting the light formed into an electrical signal by the inspection imaging device by the inspection imaging device included in the camera module; and a first of the lens system and the imaging device according to the electric signal. And adjusting the positional relationship.

  According to the camera module adjustment device and the adjustment method thereof according to the present invention, even when the distance between the test chart and the camera module is greatly separated, a light source capable of performing the same adjustment as the method using the test chart By using the unit, it is possible to achieve an excellent effect that space saving of the camera module adjustment device can be achieved.

It is a figure which shows the method of the focus adjustment of the conventional camera module. It is a block diagram which shows schematic structure of the conventional focus adjustment apparatus. It is a block diagram showing a schematic structure of a camera module adjustment device of an embodiment of the present invention. It is a figure which shows the structure of the light source unit in the camera module adjustment apparatus of embodiment of this invention. It is a figure which shows the method of adjustment of the reference | standard camera module in the camera module adjustment apparatus of embodiment of this invention. It is a figure which shows the method of adjustment of the light source unit in the camera module adjustment apparatus of embodiment of this invention. It is a figure which shows the method of adjustment of the test | inspection camera module in the camera module adjustment apparatus of embodiment of this invention. It is a flowchart which shows the procedure of the focus adjustment of the test | inspection camera module by the focus adjustment apparatus of the camera module in embodiment of this invention.

  In the camera module adjustment device of the present invention, a diffusion plate for emitting light incident from a light source as diffused light and a chart for emitting diffused light as a test pattern (for example, a chart of transmission method and a resolution inspection chart are patterned Normal reflection type chart (eg, test chart, resolution inspection) by using a light source unit provided with a reticle or mask) and a collimator lens that converts the test pattern into parallel light at infinity and emits it. The adjustment equivalent to the method of using the chart) can be performed, and the space saving of the camera module adjustment device can be achieved.

  Hereinafter, a camera module adjustment apparatus and a method thereof according to the embodiment will be described in detail with reference to the drawings. The present invention is not limited by this embodiment.

  FIG. 3 is a block diagram showing a schematic configuration of the camera module adjustment device of the embodiment. The camera module adjustment device 10 is an apparatus or system for adjusting a camera module. In FIG. 3, a light source unit 11 for emitting the light pattern of the reference chart and a light source unit 11 for fixing the camera module 12 and the camera module 12 to be inspected are fixed. The focus of the camera module 12 (for example, the distance between the lens system of the camera module 12 and the imaging device or the distance between the lens system of the camera module 12 and the imaging device) based on the calculated resolution using signals output from the mounting unit 13 (for example, socket board) A processing unit 14 (for example, a personal computer) which outputs a control signal for adjusting the positional relationship) and a focus position driving unit 15 which adjusts the focus position based on the control signal are shown.

  The camera module 12 also outputs a signal corresponding to the light pattern incident from the light source unit 11 to the processing unit 14. In the processing unit 14, the control unit 14c outputs a read signal instructing the signal detection unit 14a to read the signal output from the camera module 12. The signal detection unit 14a detects a signal output from the camera module 12 through the mounting unit 13 according to the read signal from the control unit 14c, and sequentially transmits the signal as digital data to the resolution calculation unit 14b. Then, using the digital data, the resolution calculation unit 14b calculates the resolution, and transmits the resolution and timing signal to the control unit 14c and the position adjustment unit 14d. In response to the timing signal, the control unit 14c outputs a control signal for moving the focus position to the position adjustment unit 14d to the focus position drive unit 15. Then, the control unit 14c stores the correspondence between the focus position and the resolution in the storage unit 14e. After the storage is completed, the control unit 14c calculates the optimal focus position based on the data of the resolution in the movement range of the focus position.

  In addition, as an application of the camera module 12, it is for electronic devices, such as a mobile terminal with a camera, a digital camera, or a smart phone, for example.

  Next, the configuration and function of the light source unit 11 will be described. The configuration of the light source unit 11 is shown in FIG.

  As shown in FIG. 4, the light source unit 11 includes a light source 11a, a diffusion plate 11b that emits light incident from the light source 11a as diffused light, and a chart 11c that emits diffused light as a test pattern (or light pattern) And a collimator (collimator lens) 11 d that converts the test pattern into parallel light at infinity and emits the parallel light. FIG. 4 shows the distance between the chart 11c and the collimator 11d adjusted to the focal distance f of the collimator 11d.

  An LED may be adopted as the light source 11a, and in particular, a white LED is suitable for the camera module adjustment device of the present invention. Further, the chart 11 b may be either a transmissive chart, a reticle on which a resolution inspection chart of a camera is patterned, or a mask.

  Next, in the camera module adjustment device according to the embodiment of the present invention, the reference chart 6 used for adjustment of the camera module is a camera module (hereinafter referred to as a reference camera module) 16 which is used as a reference for focus adjustment. Shoot and adjust the reference camera module 16. Subsequently, the light source unit 11 is adjusted using the reference camera module 16. First, a method of adjusting the reference camera module 16 is shown in FIG. The adjustment method is to adjust the distance Fs between the lens system (focus lens system) 16a of the standard camera module 16 and the imaging element 16b so that the position of the imaging element 16b matches the focal length of the lens system 16a. Let's do it. In addition, the electronic signals output from the imaging device 16b may be data analyzed to adjust the relative positional relationship between the lens system 16a and the imaging device 16b so as to obtain high resolution.

  Next, adjustment of the light source unit 11 will be described.

  A method of adjusting the light source unit 11 is shown in FIG. Regarding the adjustment method, the optical axis of the standard camera module 16 and the optical axis of the light source unit 11 are aligned, and the distance between the standard camera module 16 and the light source unit 11 is adjusted to a predetermined value L1. The predetermined value L1 is set smaller than the inter-object distance L0 (> L1) between the reference chart 6 and the standard camera module 16 at the time of adjustment of the standard camera module 16. After the adjustment of the distance, the distance or positional relationship between the chart 11c and the collimator 11d is adjusted so as to obtain the same resolution as when the reference camera module 16 is adjusted. If the light from the chart 11c is equivalent to coming from infinity, the distance Fc or the positional relationship between the chart 11c of the light source unit 11 and the collimator 11d is adjusted so that the collimator 11c emits substantially parallel light. Also, it may be confirmed that the parallel luminous flux is normally incident on the standard camera module 16.

  Next, adjustment of a camera module to be inspected (hereinafter referred to as an inspection camera module) will be described.

  Here, a method of adjusting the inspection camera module 17 is shown in FIG. Regarding the adjustment method, the optical axis of the inspection camera module 17 and the optical axis of the light source unit 11 are aligned, and the distance between the inspection camera module 17 and the light source unit 11 is maintained at a predetermined value L1. Then, the distance Fk between the lens system 17a and the imaging device 17b is adjusted to obtain the same resolution as that when adjusting the reference camera module 16. In addition, the electronic signals output from the imaging device 17b may be data analyzed to adjust the relative positional relationship between the lens system 17a and the imaging device 17b so as to obtain high resolution.

  Next, the procedure of focus adjustment of the camera module will be described.

  Here, a flowchart of focus adjustment of the camera module is shown in FIG.

  As a first step, focus adjustment of the reference camera module 16 by the reference chart 6 is performed.

  First, the reference chart 6 and the reference camera module 16 are installed, and the optical axis of the reference camera module 16 is adjusted so as to pass through the center (center coordinates) of the reference chart 6 (step S10).

  Then, the reference chart 6 is photographed by the reference camera module 16 (step S20).

  Next, the resolution of the reference camera module 16 is calculated, and the distance at the time of photographing and the resolution are associated and stored (step S30).

  Subsequently, the predetermined step width is shifted with respect to the distance between the reference lens system 16a and the reference imaging element 16b in the reference camera module 16 (step S40).

  Next, it is determined whether or not the distance between the reference lens system 16a and the reference imaging element 16b is out of the movable range (specifically, the distance <the movable minimum value or the movable maximum value <the distance). (Step S50). If the determination in step 50 is NO (the distance is within the movable range), the process returns to step 20. If the determination is YES (the distance is out of the movable range), the process proceeds to step 60 described later.

  Subsequently, the reference camera module 16 (the distance between the reference lens system 16a and the reference imaging element 16b) is adjusted using data of resolution corresponding to the driven distance (step S60).

  Then, the reference chart 6 is removed from the camera module adjustment device 10 (step 70). At this step, adjustment of the camera module is completed.

  As a second step, the light source unit is adjusted.

  First, the light source unit 11 is installed in the camera module adjustment device 10, and the light source unit 11 is turned on (lit) (step S80).

  Next, the light axis of the light source unit 11 and the light axis of the reference camera module 16 are adjusted to be aligned (step S90).

  The distance between the chart 11 c and the collimator lens 11 d is adjusted (for example, parallel light from infinity is emitted in the light source unit 11) (step S 100).

  Then, the reference camera module 16 is removed from the camera module adjustment device 10 (step S110). The adjustment of the light source unit 11 is completed by the processing up to this point.

  As a third step, focus adjustment of the inspection camera unit 17 is performed.

  First, the inspection camera module 17 is installed, and adjustment is made to align the optical axis of the light source unit 11 with the optical axis of the inspection camera module 17 (step S120).

  Next, the light source unit 11 is photographed by the inspection camera module 17 (step S130).

  Then, the resolution of the inspection camera module 17 is calculated, and the distance at the time of shooting and the resolution are associated and stored (step S140).

  Subsequently, the predetermined step width is shifted with respect to the distance between the inspection lens system 17a and the inspection imaging device 17b in the inspection camera module 17 (step S150).

  Next, the distance between the inspection lens system 17a of the inspection camera module 17 and the inspection image pickup device 17b is out of the movable range (specifically, the distance <the movable minimum value or the movable maximum value <the distance) It is determined whether or not (step S160). If the determination in step 160 is NO (the distance is within the movable range), the process returns to step 120. If the determination is YES (the distance is out of the movable range), the process proceeds to step 170 described later.

  Then, using the data of the resolution corresponding to the driven distance, the inspection camera module 17 (the distance between the inspection lens system 17a and the inspection image pickup element 17b) is adjusted (step S170).

  The distance or position between the inspection lens system 17a of the inspection camera module 17 and the inspection image pickup element 17b so that the resolution of the inspection camera module becomes equivalent to the resolution at the time of adjusting the reference camera module through steps S10 to S170. Adjust the relationship. At that time, the inspection lens system 17a or the inspection image pickup device 17b may be arranged to interlock with the focus position drive unit, and the positional relationship may be adjusted. In addition, if an autofocus (hereinafter abbreviated as AF) driving unit is added to the inspection camera module, AF driving may be performed.

  The inspection camera module 17 is removed from the camera module adjustment device 10, and the light source unit is turned off (turned off) (step S180).

  It is determined whether the adjustment of the inspection camera module 17 is completed (step S190). If the determination in step 190 is negative, the process returns to step 130 to adjust the next inspection camera module 17. If the determination is YES, the process of adjusting the focus of the inspection camera module 17 is ended.

  Further, after the focus adjustment of the inspection camera module 17, in order to fix the positional relationship between the inspection lens system 17a inspection and the image pickup device 17b (a state equivalent to the adjusted reference camera module 17), for example, a thermosetting adhesive is applied. It is preferable to perform processing such as curing and fixing, or coating with an ultraviolet-curable resin and irradiating and fixing ultraviolet light. The adhesive may be made of any material as long as the positional relationship between the imaging device and the lens system can be stably fixed.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and it is not intending limiting the range of invention. This novel embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, the processing procedures, control procedures, specific names, information including parameters used for each processing, signals, or database configurations shown in the specification and drawings are arbitrarily changed unless otherwise specified. be able to.

  Further, regarding the camera module adjustment device 10 of the present invention, each component shown in the drawings is functionally conceptual and does not necessarily have to be physically configured as shown. For example, the CPU and the CPU interpret and execute all or any part of the processing functions of the respective devices of the camera module adjustment device 10, in particular, the processing functions performed by the processing unit 14 It may be realized by a program.

  The program is recorded in a non-temporary computer-readable recording medium that includes programmed instructions for causing a computer to execute the method according to the present invention, which will be described later. Read mechanically. That is, a computer program for giving instructions to the CPU in cooperation with the OS (Operating System) and performing various processing is recorded in the storage unit 14 e such as the ROM or the HDD. The computer program is executed by being loaded into the RAM, and cooperates with the CPU to configure the control unit.

  In addition, the computer program may be stored in the connected application program server via the arbitrary network with respect to the processing unit 14, and all or part of the computer program may be downloaded as necessary. It is.

  Further, the program according to the present invention may be stored in a computer readable recording medium, or may be configured as a program product. Here, the "recording medium" is a memory card, USB memory, SD card, flexible disk, magneto-optical disk, ROM, EPROM, EEPROM, CD-ROM, MO, DVD, and Blu-ray (registered trademark). It includes any "portable physical media" such as Disc.

  The “program” is a data processing method described in any language or description method, and may be in any format such as source code or binary code. Note that the “program” is not necessarily limited to one that is configured in a single way, and achieves its function in cooperation with a separate program represented by a plurality of modules or libraries or a separate program represented by the OS. Including things. In addition, as a specific configuration for reading a recording medium in each device shown in the embodiment of the present invention, a reading procedure, an installation procedure after reading, and the like, a known configuration and procedure can be used.

  In addition, the processing unit 14 may be configured as an information processing apparatus such as a known personal computer, or may be configured by connecting an arbitrary peripheral device to the information processing apparatus. Further, the processing unit 14 may be realized by mounting software (including a program, data and the like) that causes the information processing apparatus to realize the method of the present invention.

  Furthermore, the specific form of device distribution and integration is not limited to that shown in the drawings, and all or part thereof may be functionally or physically in any unit depending on various additions or according to functional load. Can be distributed and integrated. That is, the embodiments described above may be implemented in any combination, and the embodiments may be implemented selectively.

  Further, although the present invention also shows an embodiment in which the distance between the chart of the optical unit and the collimator is adjusted to emit parallel light at infinity, adjustment is performed so that light rays at finite distance are emitted. For example, it is preferable to adjust the distance between the chart of the optical unit and the collimator so as to be emitted from the reference chart.

  In addition, when calculating the resolution of the camera module, the resolution may be calculated using, for example, a modulation transfer function (MTF) method. The object that the optical system targets can be regarded as an aggregate of patterns with various sizes, ranging from rough light and dark patterns to fine light and dark patterns, but in MTF, these light and dark patterns (contrast) It is an index that shows how faithfully you can reproduce the image. Also, the resolution may be calculated based on the spatial frequency calculated from the imaging data of the camera module.

DESCRIPTION OF SYMBOLS 10 Camera module adjustment apparatus 11 Light source unit 11a Light source 11b Diffusion plate 11c Chart 11d Collimator (collimator lens)
12 camera module 13 mounting unit 14 processing unit 14a signal detection unit 14b resolution calculation unit 14c control unit 14d position adjustment unit 14e storage unit 15 focus position drive unit 16 reference camera module 16a reference lens system 16b reference image sensor 17 inspection camera module 17a inspection Lens system 17b Inspection imaging device 18 Reference chart 101 Focus adjustment device 102 Camera module 102a Lens system 102b Imaging device 103 Socket board 104 Computer 104a Detection unit 104b Calculation unit 104c Focus adjustment unit 106 Reference chart 107 Focus lens drive device

Claims (13)

A camera module adjustment device comprising a light source unit and an inspection camera module, wherein
The light source unit comprises a light source, a diffusion plate for emitting light incident from the light source as diffused light, a chart for converting the diffused light into a test pattern and emitting the test pattern, and the test pattern as parallel light at infinity. A collimator lens for converting and emitting light;
The camera module includes an inspection lens system and an inspection image sensor.
The parallel light is imaged on the light receiving surface of the inspection imaging device by the inspection lens system, and the imaged light is converted into an electrical signal by the inspection imaging device.
An adjustment device for a camera module, which adjusts a first positional relationship between the lens system and the imaging device according to the electrical signal. Adjusting a second positional relationship between the reference lens system of the reference camera module and the reference imaging device using the reflection type reference chart;
The camera module adjustment device according to claim 1, wherein a third positional relationship between the diffusion plate and the collimator lens is adjusted using the reference camera module whose second positional relationship has been adjusted. Adjustment of the second positional relationship and adjustment of the third positional relationship
The camera module adjustment device according to claim 2, wherein the first resolution of the reference camera module and the second resolution of the camera module are equal. The said chart is a transmission type which controls the transmittance | permeability of the said diffused light, The adjustment apparatus of the camera module in any one of the Claims 1 thru | or 3. The adjustment device for a camera module according to claim 4, wherein the chart is a mask or reticle for semiconductor processing. The adjustment device of a camera module according to any one of claims 1 to 5, wherein the light source is a light emitting diode. A camera module adjustment method comprising a light source unit and an inspection camera module, comprising:
Emitting a light source and light incident from the light source as diffused light by a diffusion plate using the light source unit;
Converting the diffused light into a test pattern according to a chart and emitting it;
Converting the test pattern into parallel light at infinity and emitting it by a collimator lens;
The parallel light is imaged on a light receiving surface of the inspection image pickup device by the inspection lens system included in the camera module;
Converting the imaged light into an electrical signal by the inspection imaging device by the inspection imaging device included in the camera module;
Adjusting the first positional relationship between the lens system and the imaging device in accordance with the electrical signal. Adjusting a second positional relationship between the reference lens system of the reference camera module and the reference imaging device using the reflection type reference chart;
The adjustment method of the camera module of Claim 7 which adjusts the 3rd positional relationship of the said diffusion plate and the said collimator lens using the said reference | standard camera module which adjusted the said 2nd positional relationship. Adjustment of the second positional relationship and adjustment of the third positional relationship
The camera module adjustment method according to claim 8, wherein the first resolution of the reference camera module and the second resolution of the camera module are equal. The method for adjusting a camera module according to any one of claims 7 to 9, wherein the chart is of a transmission type for controlling the transmittance of the diffused light. The method for adjusting a camera module according to claim 10, wherein the chart is a mask or reticle for semiconductor processing. The method for adjusting a camera module according to any one of claims 7 to 11, wherein the light source is a light emitting diode. A program for causing a computer to execute camera module adjustment having a light source unit and an inspection camera module,
Emitting a light source and light incident from the light source as diffused light by a diffusion plate using the light source unit;
Converting the diffused light into a test pattern according to a chart and emitting it;
Converting the test pattern into parallel light at infinity and emitting it by a collimator lens;
The parallel light is imaged on a light receiving surface of the inspection image pickup device by the inspection lens system included in the camera module;
Converting the imaged light into an electrical signal by the inspection imaging device by the inspection imaging device included in the camera module;
Adjusting the first positional relationship between the lens system and the imaging device in accordance with the electrical signal.

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