TW201300866A - Focus adjusting device, device for manufacturing camera module, focus adjusting method, method for manufacturing camera module, focus adjusting program and recording medium - Google Patents

Abstract

The present invention provides a focus adjusting device, which comprises: an inspection section that inspects a distance y; an operation section that is operated on the following formula to obtain a distance dz; and a focus adjusting section that makes the relative distance between a focus lens (21) and an image plane (22) shortened to just the distance dz. In the formula, a is the optimum object distance of the camera, and f is the focus point distance of the focus lens. The distance y is the distance between a position where a straight line passing through the center of the focus lens and forming an angle <theta> with respect to an optic axis of the focus lens intersects the image plane and a position where the optical axis intersects the image plane.

Description

Focus adjustment device, camera module manufacturing device, focus adjustment method, camera module manufacturing method, focus adjustment program, and recording medium

The present invention relates to the manufacture of camera modules, and more particularly to position adjustment of a focus lens.

In recent years, the load factor of camera modules for capturing still images or moving images in mobile devices such as mobile phones has increased, which has become a major cause of increased demand for camera modules. In recent years, in order to improve the image quality, the camera module has been pursued for high-pixel, high-performance, and high-performance functions, and has been optimized for focusing lenses of camera modules. Focus adjustment. Further, in particular, in the case of a camera module mounted in a mobile device, it is generally at least intended to make the focus fit infinity or a specific close-up distance (hereinafter referred to as "optimal object distance"), and to pursue good manufacturing. Adjust the focus. In the production process of the camera module, a light receiving sensor such as a CCD (charge coupled device) sensor or a CMOS (complementary metal oxide semiconductor) sensor is assembled ( In the case of a solid-state imaging device) and a lens, it is necessary to adjust the relationship between the position of the light-receiving image surface of the sensor and the relative relationship of the lens in the optical axis direction.

In the adjustment of the focus of the manufacturing, in general, the operator confirms the captured image of the camera module displayed in the display portion of the test machine by visual inspection, and manually uses the focus lens of the camera module along the optical axis direction. Move to adjust to the focus position. Moreover, the operator confirms the sharpness of the captured image displayed on the display unit of the test machine by manual operation. And adjust the focus.

However, when the operator adjusts the focus by manual operation, there is a problem that the manufacturing cost is rapidly increased due to the high labor cost. The accuracy of the adjustment of the focus varies depending on the operator, that is, the quality of the camera module is affected by the operator, and it is difficult to sufficiently achieve the stability of the quality.

On the other hand, in the following Patent Document 1, it is disclosed that an approximate curve indicating the relationship between the position information of the focus lens and the focus level is obtained, and the position information at which the focus level is maximized is obtained, thereby adjusting the focus of the focus lens. Adjust the device.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. JP-A-2009-3152 (published on January 8, 2009)

However, in the focus adjustment device disclosed in Patent Document 1, since a plurality of images having different focus adjustment positions are required in order to obtain an approximate curve, a large amount of time is required for adjustment. Further, in the above-described focus adjustment device, in order to adjust the focus of an object placed in the device, it is necessary to change the position of the object in the device every time the optimal object distance of the camera module to be adjusted is changed. Large-scale transformation of the device. Furthermore, the optimal object distance of the camera module is a long distance. As the size of the focus adjustment device becomes larger, the production equipment of the camera module is enlarged.

The present invention has been completed to solve the above problems, and its purpose is to provide A focus adjustment device and a focus adjustment method for high production efficiency and ingenuity.

In order to solve the above problems, the focus adjustment device of the present invention is characterized in that it includes a position adjustment mechanism for adjusting a relative position of a focus lens of the camera module with respect to an image surface, and includes: a detection mechanism that detects the passage before the position adjustment a center of the focus lens at a position θ with respect to an optical axis of the focus lens at a position intersecting the image plane, a distance y from a position at which the optical axis intersects the image plane, and an arithmetic mechanism to be applied to The optimal object distance of the camera module is set to a, the focal length of the focus lens is f, and the distance dz obtained by the following formula (1) is calculated, and the position adjustment mechanism causes the focus lens and the above The relative distance of the image plane is shortened by only the distance dz.

In order to solve the above problems, the focus adjustment method of the present invention is characterized in that it has a position adjustment step of adjusting the relative position of the focus lens of the camera module with respect to the image plane, and includes: a detecting step before the position adjustment step, Detecting a position at which a line passing through the center of the focus lens at an angle θ with respect to an optical axis of the focus lens intersects the image plane, a distance y from a position at which the optical axis intersects the image plane, and an operation step of The optimum object distance applied to the camera module is set to a, the focal length of the focus lens is set to f, and the distance calculated by the following formula (1) is calculated. Dz; and in the position adjustment step, the relative distance between the focus lens and the image plane is shortened by only a distance dz.

According to the above configuration, the distance dz is calculated from the angle θ, the distance y, the optimum object distance a, and the focal length f, and the distance between the focus lens and the image plane is shortened by only the distance dz, and the focus lens can be adjusted to The best image position. That is, since the focus adjustment amount can be calculated in one calculation, focus adjustment with respect to an arbitrary optimum object distance can be performed in a short time.

The distance y is, for example, a plate (a light blocking mechanism) having a specific shape, and a laser light source (light emitting mechanism) that emits laser light incident at an angle θ with respect to an optical axis of the focus lens, based on the image surface. It is detected by the image on it. At this time, since the drawing plate or the laser light source can be disposed at a closer distance than the optimal object distance of the camera module, the device can be easily miniaturized.

Therefore, it is possible to provide a focus adjustment device and a focus adjustment method which are high in production efficiency and can be made compact.

As described above, the focus adjustment device of the present invention includes a position adjustment mechanism for adjusting the relative position of the focus lens of the camera module with respect to the image plane, and includes: a detection mechanism that detects the center of the focus lens before the position adjustment And a position at which the straight line at an angle θ with respect to the optical axis of the focus lens intersects the image plane, and a position where the optical axis intersects the image plane a distance y; and an arithmetic mechanism that applies the optimum object distance to the camera module to a, sets the focal length of the focus lens to f, and calculates a distance dz obtained by the following equation (1) And the position adjustment mechanism shortens the relative distance between the focus lens and the image surface by only a distance dz.

Moreover, the focus adjustment method of the present invention includes the step of adjusting the position of the focus lens of the camera module relative to the image plane, and includes: a detecting step of detecting the center of the focus lens before the position adjustment step a distance at which a line at an angle θ with respect to an optical axis of the focus lens intersects the image plane, a distance y from a position at which the optical axis intersects the image plane, and an operation step of being applied to the camera module The optimum object distance is set to a, the focal length of the focus lens is set to f, and the distance dz obtained by the following formula (1) is calculated; and in the position adjustment step, the focus lens and the image plane are made The relative distance is shortened by only the distance dz.

Therefore, it is effective to provide a focus adjustment device and a focus adjustment method which are high in production efficiency and can be made compact.

An embodiment of the present invention will be described below with reference to Figs. 1 to 9 .

(Composition of camera module manufacturing device)

Fig. 1 is a view showing a schematic configuration of a part of a camera module manufacturing apparatus 1 of the present embodiment. The camera module manufacturing apparatus 1 is a device for manufacturing the camera module 2. In FIG. 1, the socket board 3, the personal computer 4, the conveying device 5, and the board 6 which constitute the components of the camera module manufacturing apparatus 1 are shown.

The socket board 3 transmits the captured image data captured by the solid-state imaging element of the camera module 2 to the personal computer 4.

The personal computer 4 calculates an adjustment amount of the relative distance with respect to the image plane of the focus lens based on the captured image data and the optimum object distance applied to the camera module 2. Here, the optimum object distance is a distance set in advance at the time of manufacture as the distance of the object in which the focus state of the camera module 2 is the largest, and the optimum object distance is different in the type of each camera module 2.

The focus lens is moved by the focus lens driving device of the camera module 2 to be described later based on the adjustment amount of the relative distance with respect to the image plane of the focus lens calculated in the personal computer 4. Thereby, the position of the focus lens corresponding to the optimum object distance is adjusted.

The socket board 3 is provided in an attachment of the conveying device 5 that carries the camera module 2. Each camera module 2 is transported in a state in which a focus lens and a solid-state image sensor provided on an image surface of the focus lens are mounted, and is sequentially focused and adjusted at a position closest to the socket board 3 (referred to as a focus adjustment position). . Further, at the focus adjustment position, the drawing board 6 which is spaced apart in the optical axis direction of the focus lens of the camera module 2 is provided.

The panel 6 is equivalent to the light blocking mechanism disclosed in the patent application scope, For example, the black plate having a circular opening 61 at the center is shown in FIG. As shown in FIG. 1, the panel 6 is disposed such that its opening 61 faces the focus lens of the camera module 2 at the focus adjustment position. Thereby, light mainly passing through the opening 61 is incident on the focus lens of the camera module 2.

Among the members constituting the camera module manufacturing apparatus 1 shown in Fig. 1, the socket board 3, the personal computer 4, and the board 6 are included in the focus adjustment apparatus of the present invention.

Fig. 3 is a block diagram showing a schematic configuration of the above-described focus adjustment device. The focus adjustment device includes a socket board 3, a personal computer 4, a picture board 6, and a focus lens driving device 7.

The personal computer 4 includes a detection unit 41, a calculation unit 42, and a focus adjustment unit 43. The functional blocks formed in the personal computer 4 are formed by performing a focus adjustment program in the personal computer 4.

The captured image data captured by the solid-state imaging device of the camera module 2 is transmitted from the socket board 3 to the detecting unit 41 of the personal computer 4. The detecting unit 41 corresponds to the detecting means disclosed in the patent application, and detects "distance y" which will be described later from the captured image data. The calculation unit 42 corresponds to the calculation mechanism disclosed in the patent application, and calculates the "distance dz" which is the focus adjustment amount from the detected distance y. The focus adjustment unit 43 corresponds to the position adjustment mechanism disclosed in the patent application, and causes the focus lens driving device 7 to change the relative positional change between the focus lens and the image plane of the camera module 2 only by the calculated distance dz. Instructions.

(for the operation of focus adjustment)

Next, the operation of focusing adjustment for the focus lens of the present embodiment is performed. Give specific instructions.

4 is a cross-sectional view showing the positional relationship between the camera module 2 and the board 6. The left-right direction in Fig. 4 corresponds to the upper and lower directions in Fig. 1.

As shown in FIG. 4, the focus lens 21 of the camera module 2 is opposed to the opening 61 of the panel 6, and the center of the opening 61 is located on the optical axis of the focus lens 21.

A solid-state imaging element such as a CCD sensor or a CMOS sensor is disposed on the image plane 22 of the focus lens 21. The image of the opening 61 of the panel 6 is reflected on the image plane 22 and photoelectrically converted by a solid-state imaging element. Thereby, the captured image data as shown in FIG. 5 is generated. This captured image data is transmitted from the socket board 3 to the personal computer 4.

Here, as shown in FIG. 4, the intersection of the optical axis of the focus lens 21 and the image plane 22 is set to the position Y1. Further, the distance between the focus lens 21 and the drawing plate 6 and the size of the opening 61 are set so that the line connecting the edge of the opening 61 and the center of the focus lens 21 is at an angle θ with respect to the optical axis of the focus lens 21. The intersection of the straight line before the focus position adjustment and the image plane 22 is set to the position Y2. At this time, the distance between the position Y1 and the position Y2 is set to y.

Moreover, if the optimal object distance set in the manufacture of the camera module 2 is a, the distance between the optimal image plane position F1 of the focus lens 21 and the principal plane of the focus lens 21 at the optimum object distance a is set. For b, when the distance between the image plane 22 before the focus position adjustment and the optimum image plane position is dz, y = (b + dz) × tan θ, and if the focus distance of the focus lens 21 is f According to the mapping formula, it becomes: (1/a) + (1/b) = 1/f.

According to the equation, the following formula holds:

In the focus adjustment step in the present embodiment, the distance y is detected based on the captured image data shown in FIG. 5 by the detecting unit 41 of the personal computer 4 shown in FIG. 3 (detection step). Further, the optimum object distance a, the focal length f, and the angle θ are previously stored in the personal computer 4. Thereby, the computing unit 42 of the personal computer calculates the distance dz (calculation step) from (Formula 1), and the focus adjustment unit 43 controls the focus lens driving device so that the relative distance between the focus lens 21 and the image plane 22 is shortened by only the distance dz. 7 (position adjustment step). In other words, the distance dz is a positive value, so that the focus lens 21 and the image plane 22 are adjusted so as to be close to the distance dz only, and the distance dz is a negative value, so that the focus lens 21 and the image plane 22 are only dz absolute. Adjust the value of the distance. In this adjustment, the focus lens 21 can be moved, and the image plane 22 can be moved. Thereby, the position of the focus lens 21 is adjusted so as to be the optimum image plane position F1 of the camera module 2 at the optimum object distance a.

As described above, in the present embodiment, before the focus adjustment, the position Y2 at which the line passing through the center of the focus lens 21 and at an angle θ with respect to the optical axis of the focus lens 21 intersects the image plane 22 is detected, and the optical axis is The distance y at the position Y1 where the image plane 22 intersects is calculated by calculating the distance dz obtained in the equation (1) so that the relative distance between the focus lens 21 and the image plane 22 is shortened by only the distance dz, thereby performing focus adjustment. That is, since the distance of the focus adjustment can be calculated in one operation, the focus adjustment with respect to an arbitrary optimum object distance can be performed in a short time.

Moreover, regardless of the optimum object distance between the panel 6 and the camera module 2, the position of the panel 6 is set such that the off-axis ray path passing through the edge of the opening 61 is at an angle θ with respect to the optical axis of the focus lens 21. Just fine. That is, the board 6 can be placed at a distance (for example, 10 to 50 cm) from the camera module 2 at the focus adjustment position without setting the optimum object distance of the board 6 to the camera module 2.

Therefore, a focus adjustment device with high production efficiency and precision can be realized.

Further, the value of the angle θ described above is also not particularly limited as long as it satisfies 0 deg<θ<90 deg. Further, although the angle θ is larger, the accuracy of the focus position adjustment is improved, but the aberration due to the manufacturing error is increased. Further, if the distance between the drawing board 6 and the camera module 2 is too close, the aberration such as distortion becomes large. The accuracy of the focus position adjustment will be described later.

(variation)

In the above, before the focus adjustment, the position Y2 at which the line passing through the center of the focus lens 21 and at an angle θ with respect to the optical axis of the focus lens 21 intersects the image plane 22 is intersected with the optical axis and the image plane 22 The distance Y of the position Y1 is used, and the board 6 having the circular opening 61 is used, but the detection method of the distance y is not limited thereto. The shape of the opening of the drawing plate is not particularly limited. For example, as shown in Fig. 6, a drawing plate 6a having a rectangular opening 62 may be used.

In this case, as shown in Fig. 7, since the image of the opening 62 reflected on the image plane 22 is also rectangular, the position of the optical axis of the focus lens 21 intersecting the image plane 22 and the distance from the outer edge of the image are not for sure. Therefore, in the case of using the panel 6a, for example, the image of the opening 62 can correspond to the opening 62. The distance between the position Y2a of the specific edge 62a and the above position Y1 is set to the distance y used for the above calculation. At this time, the angle formed by the straight line connecting the edge 62a and the center of the focus lens 21 and the optical axis of the focus lens 21 is set to an angle θ used for the above calculation. Thereby, the distance dz is calculated from the above formula (1).

Alternatively, regarding the complex edge of the opening 62, the distance dz can be calculated by the above formula (1), and the calculated value of each distance dz can be used for focus adjustment.

Further, in the above description, the distance y is detected based on the image of the opening of the panel, but the shape of the panel is not limited thereto. For example, a black disc-shaped panel 6b shown in Fig. 8(a) or a black rectangular panel 6c shown in Fig. 8(b) can be used. Even in the case of using the panels 6b, 6c, the distance y can be detected based on the image mapped on the image plane 22. In addition, the shape of the board is not limited to a circle and a rectangle.

Further, the distance dz can be obtained by using a laser light source (light emitting mechanism) instead of the drawing plate. In this case, the laser light emitted from the laser light source at an angle θ with respect to the optical axis of the focus lens 21 passes through the center of the focus lens 21, and the distance between the position where the laser light reaches the image plane 22 and the position Y1 is detected as the distance y. Further, since the laser light has directivity, there is an advantage that the error of the focus adjustment amount to be described later is small. In this configuration, the position of the laser light source is also not particularly limited, and may be a distance closer to the optimum object distance of the camera module 2. Therefore, it is possible to reduce the size of the focus adjustment device.

Further, the light for detecting the distance y is not limited to the laser light as long as it is light having directivity.

In this way, in the present embodiment, if the focus adjustment can be performed, the detection can be performed. The focus lens can be placed at a distance y from the center of the focus lens 21 and at an angle θ with respect to the optical axis of the focus lens 21 to the position Y2 where the image plane 22 intersects, and the position Y1 at which the optical axis and the image plane 22 intersect. 21 is adjusted to the optimum image plane position under the optimum object distance a, and the method of detecting the distance y is not particularly limited.

(accuracy of focus adjustment)

As shown in FIG. 4, the light passing through the edge of the opening 61 of the panel 6 and passing through the center of the focus lens 21 converges at the imaging position F2. The position of the imaging position F2 and the image plane 22 is generally inconsistent except for the case where the position of the image plane 22 before the focus adjustment coincides with the imaging position F2. Therefore, the image shown in FIG. 5 becomes a state in which the outer edge is blurred, and an error occurs in the detection of the distance y.

Here, when the pixel pitch (distance between the solid-state imaging elements) is ε (μm) and the blur width of the image is ε or less, the detection error of the distance y becomes ε. In other words, when the maximum value of the detected distance y is y' and the minimum value of the detected distance y is y", ε = y' - y "... (2). Here, according to the above formula (1), it becomes: Therefore, when the distance dz calculated based on the distance y' is the distance dz' and the distance dz calculated based on the distance y" is the distance dz", y'-y"=(dz'-dz")×tanθ . And according to the formula (2), the following formula holds: dz'-dz"=ε/tanθ...(3).

Since dz'-dz' is an error of the focus adjustment amount of the focus lens 21, and ε is constant, it is understood that the accuracy of the focus adjustment is higher as the angle θ is larger. For example, if the pixel pitch ε = 1.4 μm of the camera module 2, the relationship between the angle θ and the error of the focus adjustment amount is as shown in Table 1 below.

For example, if the angle θ is 15 deg or more, the focus adjustment can be performed with an accuracy of about 5 μm or less. Regarding the manufacturing error of the focus lens, since the viewing angle error due to the manufacturing error is generally ±2 deg or less in the focus lens suitable for the mobile device, the error of the angle θ as the half angle of view is ±1 deg or less.

Further, in the case of θ = 25 deg, even if θ = 26 (25 + 1) deg due to manufacturing error, the error of the focus adjustment amount is about 0.1 μm, and high-precision focus adjustment can be realized.

(Adopting the accuracy of opening narrowing)

As described above, since the map of the panel 6 is usually a defocused image that is reflected on the image plane 22 in a blurred state, an error occurs in the focus adjustment amount. In this regard, as described below, it is desirable to make the opening diameter of the focus lens 21 larger than the camera module. The opening diameter set in 2 is analogously narrow. Thereby, since the depth of field becomes large, the amount of blur of the image can be reduced, thereby reducing the error of the amount of focus adjustment.

FIG. 9 is a cross-sectional view showing a configuration example in which the opening diameter of the focus lens 21 is reduced. The opening diameter A1 of the design of the camera module 2 is defined by the frame 23. Here, at the time of focus adjustment, the frame 8 having the opening diameter smaller than A1 of A1 is superposed on the frame 23. The frame 8 is a jig corresponding to the opening diameter reducing mechanism disclosed in the patent application, and the frame 8 blocks the light outside the opening diameter of the designing lens 21 and the outer diameter of the opening.

Thereby, since the depth of field becomes large, the amount of blur of the image of the panel 6 can be reduced, thereby improving the detection accuracy of the above-described distance y. Therefore, the error of the focus adjustment amount (dz'-dz" described above) can be reduced.

Further, when the opening diameter is reduced, the amount of light incident on the focus lens 21 is reduced. Therefore, the amount of reduction in the opening diameter can be appropriately set in accordance with the sensitivity of the solid-state image sensor.

(Example of using software)

Each block of the personal computer 4 of the camera module manufacturing apparatus 1, that is, the detecting unit 41, the calculating unit 42, and the focus adjusting unit 43 can be realized by hardware using a logic circuit formed on an integrated circuit (IC chip). It can be implemented in software using a CPU (Central Processing Unit).

In the latter case, the personal computer 4 includes a CPU that executes a command for realizing each function, a ROM that stores the above program (Read Only Memory), and a RAM that expands the program (Random Access Memory). Take memory), store the above programs and various A memory device (recording medium) such as a memory of data. Further, for the purpose of the present invention, it is also possible to provide a recording medium for recording a program (executable program, intermediate code program, and source code program) of a software that realizes the above-described functions, which is a software that realizes the above-mentioned functions, to a person. The computer 4 is realized by the computer (or CPU or MPU) reading and executing the code recorded in the recording medium.

As the recording medium, for example, a magnetic tape such as a magnetic tape or a cassette tape, a magnetic disk such as a soft (Floppy, registered trademark) disk or a hard disk, or a CD-ROM/MO/MD/DVD/CD-R or the like can be used. Discs, IC cards (including memory cards)/cards such as optical cards, semiconductor memory such as mask ROM/EPROM/EEPROM/flash ROM, or PLD (Programmable Logic Device) A logic circuit such as an FPGA (Field Programmable Gate Array).

Further, the personal computer 4 can be connected to the communication network, and the code can be supplied via the communication network. The communication network is not limited as long as the program code can be transmitted. For example, Internet, intranet, inter-business, LAN, ISDN, VAN, CATV communication network, analog private network (Virtual Private Network), telephone line network, mobile communication network Road, satellite communication network, etc. Further, the transmission medium constituting the communication network is not limited to a specific configuration or type as long as it is a medium that can transmit a code. For example, IEEE1394, USB, power line carrier, cable TV line, telephone line, ADSL (Asymmetric Digital Subscriber Line) line, etc., such as IrDA or remote control infrared, Bluetooth (registered trademark), IEEE802.11 no Line, HDR (High Data Rate), NFC (Near Field Communication), DLNA (Digital Living Network Alliance), mobile phone network, satellite line, ground wave digital network Wireless such as roads can be used. In addition, the present invention can also be implemented in the form of a computer data signal for embedding a carrier wave of the above code by electronic transmission.

(Notes)

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. In other words, the embodiments obtained by combining the technical means that are appropriately changed within the range indicated by the claims are also included in the technical scope of the present invention.

As described above, in the focus adjustment device according to the embodiment of the present invention, it is preferable that the light blocking mechanism is provided in the direction of the optical axis from the focus lens, and the light blocking mechanism is connected. a line between the edge and the center of the focus lens is at an angle θ with respect to the optical axis, and the detecting means reflects the position of the image of the light blocking mechanism on the image surface corresponding to the specific edge and the optical axis The distance is detected as the distance y.

According to the above configuration, since the light blocking mechanism can be provided at a closer distance than the optimum object distance of the camera module, it is possible to easily reduce the size of the focus adjusting device.

In the focus adjustment device according to the embodiment of the present invention, it is preferable to provide a light emitting means for emitting light that passes through the center of the focus lens at an angle θ with respect to the optical axis, and the detecting means reaches the image by the light. The position of the surface and the distance from the position where the optical axis of the focus lens intersects the image plane are detected as the distance y.

According to the above configuration, since the light emitting means can be provided at a closer distance than the optimum object distance of the camera module, it is possible to easily reduce the size of the focus adjusting device.

In the focus adjustment device according to the embodiment of the present invention, it is preferable to include an opening diameter reducing mechanism that reduces the opening diameter of the focus lens to be smaller than the opening diameter of the design of the camera module.

According to the above configuration, since the depth of field of the focus lens is reduced by the diameter of the opening of the focus lens during the focus adjustment, the amount of blur of the image is reduced. Thereby, the detection accuracy of the distance y can be improved, thereby reducing the error of the focus adjustment amount.

A camera module manufacturing apparatus according to an embodiment of the present invention includes the above-described focus adjustment device.

According to the above configuration, since the focus adjustment time of the above-described focus adjustment device is short and precise, it is possible to easily improve the productivity and size of the camera module manufacturing apparatus.

A manufacturing method of a camera module according to an embodiment of the present invention has an assembly step of assembling a focus lens and a solid-state image sensor provided on an image surface of the focus lens, and the assembly step includes the above-described detection step and the operation step of the focus adjustment method And the above position adjustment steps.

According to the above configuration, the manufacture of the camera module can be realized with high efficiency and precision.

In addition, the above focus adjustment device can be implemented by using a computer. In this case, A focus adjustment program for causing a computer to function as the above-described detection mechanism of the focus adjustment device, the calculation mechanism and the position adjustment mechanism, and a computer-readable recording medium on which the focus adjustment program is recorded are also included in the present invention. in.

[Industrial availability]

The invention is particularly suitable for the manufacture of camera modules where the optimal object distance is a long distance.

1‧‧‧ Camera module manufacturing device

2‧‧‧ camera module

3‧‧‧Socket board

4‧‧‧PC

5‧‧‧Transportation device

6‧‧‧Plate (Light Interruption Mechanism)

6a‧‧‧Plate (Light Interruption Mechanism)

6b‧‧‧Plate (Light Interruption Mechanism)

6c‧‧‧Plate (Light Blocking Mechanism)

7‧‧‧focus lens drive

8‧‧‧Frame (opening diameter reduction mechanism)

21‧‧‧focus lens

22‧‧‧face

23‧‧‧Frame

41‧‧‧Detection Department (Testing Agency)

42‧‧‧ Computing Department (computing organization)

43‧‧‧Focus Adjustment Department (Location Adjustment Mechanism)

61‧‧‧ openings

62‧‧‧ openings

A1‧‧‧ opening diameter

A2‧‧‧ opening diameter

F1‧‧‧Best image position

F2‧‧‧ imaging location

Y1‧‧‧ position

Y2‧‧‧ position

Y2a‧‧‧ position

Fig. 1 is a view showing a schematic configuration of a part of a camera module manufacturing apparatus according to an embodiment of the present invention.

Fig. 2 is a view showing an example of a board provided in the above-described camera module manufacturing apparatus.

Fig. 3 is a block diagram showing a schematic configuration of a focus adjustment device according to an embodiment of the present invention.

4 is a cross-sectional view showing the positional relationship between the camera module and the drawing board.

Fig. 5 is a view showing the image data of the image shown in Fig. 2.

Fig. 6 is a view showing another example of the drawing board.

Fig. 7 is a view showing the image data of the image shown in Fig. 6.

Fig. 8 is a view showing another example of the board, (a) showing a circular panel, and (b) showing a rectangular panel.

Fig. 9 is a cross-sectional view showing a configuration example of reducing the opening diameter of the focus lens.

1‧‧‧ Camera module manufacturing device

2‧‧‧ camera module

3‧‧‧Socket board

4‧‧‧PC

5‧‧‧Transportation device

6‧‧‧Plate (Light Interruption Mechanism)

Claims (9)

A focus adjustment device, comprising: a position adjustment mechanism for adjusting a relative position of a focus lens of the camera module relative to an image surface, and comprising: a detection mechanism that detects the center of the focus lens and is opposite before the position adjustment a distance at which a straight line at an angle θ of the focusing lens intersects the image plane, a distance y from a position where the optical axis intersects the image plane, and an arithmetic mechanism that is applied to the camera module The object distance is set to a, the focal length of the focus lens is f, and the distance dz obtained by the following formula (1) is calculated; and the position adjustment mechanism shortens the relative distance between the focus lens and the image plane. Distance dz. The focus adjustment device of claim 1, wherein the light intercepting mechanism is separated from the focusing lens in a direction of the optical axis, and a specific edge connecting the light blocking mechanism is opposite to a straight line of a center of the focusing lens The optical axis is at an angle θ. The detecting means detects a distance from the optical axis of the image of the light blocking means reflected on the image surface to the specific edge as the distance y. A focus adjusting device according to claim 1, comprising a light emitting device that emits light passing through a center of said focusing lens at an angle θ with respect to said optical axis And the detection means detects the distance from the position where the light reaches the image plane and the position where the optical axis of the focus lens intersects the image plane as the distance y. The focus adjusting device of claim 2, wherein the opening diameter reducing mechanism that reduces the opening diameter of the focusing lens to be smaller than the design opening diameter of the camera module is included. A camera module manufacturing apparatus comprising the focus adjustment device according to any one of claims 1 to 4. A focus adjustment method, comprising: a position adjustment step of adjusting a relative position of a focus lens of the camera module with respect to an image surface, and comprising: a detecting step of detecting a center passing through the focus lens before the position adjustment step a distance at which a line at an angle θ with respect to an optical axis of the focus lens intersects the image plane, a distance y from a position at which the optical axis intersects the image plane, and an operation step of being applied to the camera module The optimum object distance is set to a, the focal length of the focus lens is set to f, and the distance dz obtained by the following formula (1) is calculated; and in the position adjustment step, the focus lens and the image plane are made The relative distance is shortened by only the distance dz. A manufacturing method of a camera module, characterized by comprising an assembly focusing lens And an assembly step of the solid-state imaging element disposed on the image plane of the focusing lens, and the assembling step includes the detecting step, the calculating step, and the position adjusting step of the focus adjusting method of claim 6. A focus adjustment program for causing a computer to function as the above-described detecting means of the focus adjusting device according to any one of claims 1 to 4, the arithmetic means, and the position adjusting means. A recording medium recorded with a computer-readable focus adjustment program as claimed in claim 8.