JP2003066307A - Method of assembling and inspecting electronic imaging device and apparatus for assembling and inspecting electronic imaging device used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust the relative position of a lens module with respect to a photodetector to an optimum position with good accuracy by easily deciding focusing accuracy. SOLUTION: A subject (6) for test is arranged in front of the lens module (5) and a short focus lens (7) is arranged between the lens module (5) and the subject (6) for test. An image control means (9) is connected to the photodetector (3) and the subject (6) for test is electronically photographed by the photodetector (3) and the image control means (9) across the short focus lens (7) and the lens module (5). The relative positions of the lens module (5) and the photodetector (3) are adjusted to the optimum positions in accordance with the image obtained by this photographing and thereafter both are integrally built.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembly and inspection of an electronic image pickup device using a light receiving element, and more specifically, to easily determine a focusing accuracy and determine a relative position of a lens module with respect to the light receiving element as an optimum position. The present invention relates to a method of assembling / inspecting an electronic image pickup device and a device therefor capable of being adjusted accurately.

[0002]

2. Description of the Related Art Generally, an electronic image pickup apparatus such as a digital camera includes an objective lens module that optically forms an image of an object to be photographed on an image pickup surface, and an image of the object formed on the image pickup surface. CCDs and Cs that detect and convert to electrical signals
-A light receiving element such as a MOS is combined. These electronic image pickup devices are used for both still image shooting and moving image shooting, and with the recent trend toward miniaturization of lens modules and light-receiving elements, along with the high performance and functionality of lens modules, the pixels of light-receiving elements have become The increase in numbers is required. Further, these electronic image pickup devices sometimes use a fixed focus type lens module so that the focusing operation at the time of shooting can be omitted and the image can be easily taken. In this case, from a foreground of several tens of cm to a distant view. A pan-focus image with clear focus can be obtained.

[0003]

2. Description of the Related Art Conventionally, the lens module and the light receiving element are integrally fixed to each other in the process of assembling the electronic image pickup device. At this time, a method of adjusting the relative position of the lens module with respect to the light receiving element by using the image obtained by the light receiving element so that the light receiving surface of the light receiving element is arranged at the optimum position of the optical dimension of the lens module. There is. That is,
For example, as shown in FIG. 3, the test subject (53) is arranged in front of the lens module (52) of the electronic image pickup device (51), and the interface substrate (is attached to the light receiving element (54) of the electronic image pickup device (51). Image control means (56) is connected via 55), and the above-mentioned test subject (53) is connected to the light receiving element (54) and image control means (56).
The above-mentioned lens module (52) while observing the image obtained by this shooting electronically with the monitor (57).
The relative position between the light receiving element (54) and the light receiving element (54) is adjusted to the optimum position.
Also in the inspection process, the test subject is photographed in the same manner as above, and by observing the photographed image,
The focusing accuracy of the lens module is determined.

[0004]

The above-mentioned conventional assembly / inspection method is performed by observing the image of the test subject obtained through the above-mentioned lens module, but particularly the fixed-focus type lens module is used. In this case, the displacement of the relative position between the lens module and the light receiving element is unlikely to appear as a difference in image resolution or the like. For this reason, the adjustment work by trial and error during assembly is extremely complicated, and since it is not easy to determine the focusing accuracy even in the inspection process, it is difficult to shorten the takt time and automate in these processes, and it is difficult to measure the quality. It was not easy to improve.

The present invention solves the above problems and makes it possible to easily determine the focusing accuracy and accurately adjust the relative position of the lens module with respect to the light receiving element to the optimum position. It is a technical object to provide a method and its device.

[0006]

In order to solve the above-mentioned problems, the present invention has the following structure, for example, with reference to FIGS. 1 and 2 showing an embodiment of the present invention. That is, the invention according to claim 1 is an assembling method of an electronic image pickup device in which a light receiving element (3) and a lens module (5) are integrally assembled, and a test subject is provided in front of the lens module (5). (6) is arranged, a short focus lens (7) is arranged between the lens module (5) and the test subject (6), and the light receiving element (3) is provided with an image control means.
(9) is connected, and the test subject (6) is electronically operated by the light receiving element (3) and the image control means (9) via the short focus lens (7) and the lens module (5). The above lens module based on the images obtained by the above
The lens module (5) and the light receiving element (3) are integrally assembled after adjusting the relative positions of (5) and the light receiving element (3).

According to a second aspect of the present invention, in the first aspect of the invention, at least one of the lens module (5) and the light receiving element (3) is interlockingly connected with an assembly adjusting means (12), An image electronically captured by the light receiving element (3) and the image control means (9) is fed back to the assembly adjusting means (12), and based on this feedback, the lens module (5) and the light receiving element ( It is configured to adjust the relative position to 3).

According to a third aspect of the present invention, there is provided an inspection method for determining the focusing accuracy of an electronic image pickup device (1) comprising a light receiving element (3) and a lens module (5). The test subject (6) is arranged in front of (5), and the short focus lens (7) is arranged between the lens module (5) and the test subject (6) to detect the light receiving element (3). ) Is connected to the image control means (9), and the above-mentioned test subject (6)
Is electronically photographed by the light receiving element (3) and the image control means (9) through the short focus lens (7) and the lens module (5), and the focusing accuracy is based on the photographed image. Is determined.

According to a fourth aspect of the present invention, there is provided an electronic image pickup device assembling apparatus comprising a light-receiving element (3) and a lens module (5) which are integrated together, wherein a test subject (6) and a short focus lens (7) are provided. ) And an image control means (9), the test subject (6) is placed in front of the lens module (5), and the lens module (5) and the test subject are placed.
The short-focus lens (7) is arranged between (6) and the image control means (9) is connected to the light-receiving element (3), and the test subject (6) is connected to the test subject (6). The light receiving element (3) and the image control means through the short focus lens (7) and the lens module (5)
It is characterized in that the relative position of the lens module (5) and the light receiving element (3) can be adjusted based on the image electronically taken in (9).

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, at least one of the lens module (5) and the light receiving element (3) is interlockingly connected with an assembly adjusting means (12), Based on the feedback of the image electronically captured by the light receiving element (3) and the image control means (9) to the assembly adjusting means (12), the lens module (5) and the light receiving element (3) ) And the relative position is adjustable.

According to a sixth aspect of the present invention, there is provided an inspection device for determining the focusing accuracy of an electronic image pickup device (1) comprising a light receiving element (3) and a lens module (5), which comprises a test subject ( 6)
And a short focus lens (7) and an image control means (9), and the test subject is placed in front of the lens module (5).
(6) is arranged, the short focus lens (7) is arranged between the lens module (5) and the test subject (6), and the image control means is arranged on the light receiving element (3). (9) is connected, and the above-mentioned test subject (6) is set to the above short focus lens.
The light receiving element described above through (7) and the lens module (5).
(3) and the image control means (9) are characterized in that the focusing accuracy can be determined based on the electronically captured image.

[0012]

Since the short focus lens is arranged between the lens module and the test subject, the optical system including this lens module and the short focus lens has a shorter focal length than the case of the above lens module alone. . Therefore, the image captured by the light receiving element by the optical system including the short focus lens has a large variation in resolution and the like due to a slight displacement of the relative position of the lens module with respect to the light receiving element.
In the inspection step, the focusing accuracy of the lens module is determined based on the above resolution and the like. Further, in the assembly process, the relative position of the lens module with respect to the light receiving element is adjusted based on the above image, and the light receiving element and the lens module are fixed to each other at the obtained optimum position.

At least one of the lens module and the light receiving element is interlockingly connected with an assembly adjusting means, and an image photographed electronically by the light receiving element and the image control means is fed back to the assembly adjusting means. When the relative position between the lens module and the light receiving element is adjusted based on feedback, the relative position between the lens module and the light receiving element can be automatically adjusted to the optimum position in the assembly process. .

The lens module and the light receiving element may be directly fixed to each other and integrated, or may be integrated together via a casing of the image pickup device or the like. That is, the lens module may be fixed to the casing of the image pickup apparatus to which the light receiving element is fixed, after adjusting the mounting position of the lens barrel or the shape of the lens barrel to adjust the mounting position. After fixing to the casing, the mounting position of the light receiving element with respect to this casing may be adjusted. It goes without saying that the relative position can be adjusted not only in the optical axis direction of the lens module but also in the direction orthogonal to the optical axis and the inclination angle with respect to the optical axis.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention and is a schematic configuration diagram of an electronic image pickup apparatus assembling apparatus.

As shown in FIG. 1, this electronic image pickup device (1)
The assembling device (2) is a light receiving element (3) consisting of a two-dimensional CCD.
Light receiving element unit (4) and lens module (5)
It is used to fix and, and the test subject (6), short focus relay lens (7), and interface board (8)
And an image control means (9) and a monitor (10). The test subject (6) is arranged in front of the lens module (5) and on the optical axis (11) of the lens module (5), and the test subject (6) and the lens module (5) are arranged. The relay lens (7) is arranged in the vicinity of the lens module (5) on the optical axis (11) between and.

Here, the focal length of the optical system including the lens module (5) and the relay lens (7) is significantly shorter than that of the lens module (5) alone, for example, about 20 to 30 mm. Is set. Therefore, in the case of the lens module alone as in the above-mentioned related art, a distance of, for example, 2 m or more is required between the lens module and the test subject, but in the present embodiment, the lens module is used.
Since the optical system is composed of (5) and the short focus relay lens (7), the distance between the lens module (5) and the test subject (6) may be several cm or more.

On the other hand, the interface board (8) is attached to the light receiving element unit (4). Then, the light receiving element (3) and the image control means (9) are connected via the interface board (8), and the monitor (10) is connected to the image control means (9). It

Next, a procedure for integrating the light-receiving element unit and the lens module with the above-mentioned assembly device will be described. The image of the test subject (6) is formed on the light receiving surface of the light receiving element (3) by the optical system including the relay lens (7) and the lens module (5). This image formation is electronically photographed by the light receiving element (3) and the image control means (9), and the image is observed by the monitor (10). As a result of this observation, the resolution of the image, various aberrations, the angle of view, etc. are determined, and the mounting position and orientation of the lens module (5) with respect to the light receiving element (3) are adjusted. And the above monitor
The lens module (5) is fixed to the light receiving element unit (4) with the image observed at (10) being the sharpest,
Complete the assembly.

In the above-described first embodiment, the electronic image pickup apparatus assembling apparatus has been described. However, a configuration similar to this assembling apparatus can be used for an electronic image pickup apparatus inspecting apparatus.
That is, the inspection process by this inspection device will be described. In the assembly process, the light receiving element unit of the electronic image pickup device (1) is
The one in which (4) and the lens module (5) are integrated is set in the inspection device (2) having the same configuration as described above.

Then, an image of the test subject (6) is formed on the light receiving surface of the light receiving element (3) by the optical system including the relay lens (7) and the lens module (5). , This image formation is performed by the light receiving element (3) and the image control means.
It is electronically captured at (9) and the image is displayed on the monitor (10). By observing the sharpness of this image, various aberrations, angle of view, etc., the lens module (5)
The focusing accuracy of is determined quantitatively. If the focusing accuracy is equal to or higher than a predetermined level, it is determined as a non-defective product, and if it does not reach that level, it is recovered as a defective product.

FIG. 2 is a schematic block diagram of an electronic image pickup apparatus assembling apparatus showing a second embodiment of the present invention. In the second embodiment, the assembly apparatus of the first embodiment further includes an assembly adjustment means (12) including an adjustment mechanism (13) and a drive control means (14) thereof.

The above-mentioned adjusting mechanism (13) is interlockingly connected to the above-mentioned lens module (5).
The mounting position and mounting posture of (5) are three-dimensionally, that is, the optical axis (11) direction of the lens module (5), two directions orthogonal to this optical axis (11), and the inclination with respect to the optical axis (11). It is configured so that each angle can be displaced. On the other hand, the drive control means (14) is connected to the image control means (9), and the image of the test subject (6) photographed by the light receiving element (3) is transferred to the image control means (9). Drive control means (14) via 9)
It is configured to give feedback to. The other configurations are similar to those of the first embodiment, and therefore the description thereof is omitted.

The drive control means (14) drives the adjusting mechanism (13) based on the feedback from the image control means (9) to obtain an image obtained by the light receiving element (3). The lens module (5) is automatically displaced to a position where is sharper. The change in the image due to this displacement is monitored (1
0), the lens module (5) is adjusted to the optimum position and the image becomes the sharpest, and then the lens module (5) is fixed to the light receiving element unit (4).

In each of the above embodiments, the two-dimensional CC
Although the light receiving element made of D is used, it goes without saying that other light receiving elements such as C-MOS may be used in the present invention. Further, the above lens module may use one lens or may combine a plurality of lenses.

[0026]

Since the present invention is constructed and operates as described above, it has the following effects.

(1) Since the short focus lens is arranged between the lens module and the test subject, the image taken by the light receiving element by the optical system including this lens module and the short focus lens is the same as the image on the light receiving element. A slight displacement of the relative position of the lens module causes a large change in resolution and the like. As a result, the focusing accuracy of the lens module can be easily determined based on this image, and the focusing accuracy can be quantified.

(2) Since it is easy to determine the focusing accuracy, the relative position of the lens module with respect to the light receiving element is
It is possible to accurately adjust the three-dimensional optimum position where the image becomes the sharpest, and it is possible to easily improve the quality of the electronic imaging device.

(3) Since the relative position of the lens module with respect to the light receiving element can be adjusted with high accuracy and the focusing accuracy can be easily determined, the takt time in the inspection process and the assembly process can be shortened and the productivity can be improved. Can be improved.

(4) Since the optical system composed of the lens module and the short focus lens has a shorter focal length than the case of using the lens module alone, compared with the prior art,
The distance between the lens module and the test subject is short,
It is possible to reduce the size of the assembly device and the inspection device.

(5) Assembling and adjusting means is interlockingly connected to at least one of the lens module and the light receiving element, and an image photographed electronically by the light receiving element and the image control means is fed back to the assembling and adjusting means. However, when the relative position between the lens module and the light receiving element is adjusted based on this feedback, the adjustment of the relative position between the lens module and the light receiving element can be automated in the assembly process, thus improving productivity. Can be further enhanced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an assembly device (inspection device) of an electronic imaging device, showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an electronic image pickup apparatus assembling apparatus according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an assembly / inspection device for an electronic image pickup device, showing a conventional technique.

[Explanation of symbols]

1. Electronic imaging device 2 ... Assembly device for electronic imaging device (inspection device) 3 ... Light receiving element 5 ... Lens module 6 ... Test subject 7 ... Short focus lens (relay lens) 9 ... Image control means 12 ... Assembly adjustment means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/225 G02B 7/11 DF term (reference) 2H044 AC01 AE01 AJ04 AJ06 2H051 BA45 BA47 5C022 AB21 AC42 AC54 AC76 AC78

Claims (6)

[Claims] 1. A method of assembling an electronic image pickup device, wherein a light receiving element (3) and a lens module (5) are integrally assembled, wherein a test subject (6) is provided in front of the lens module (5).
And the short focus lens (7) between the lens module (5) and the test subject (6), and the image control means (9) is connected to the light receiving element (3). , The test subject (6) is electronically photographed by the light receiving element (3) and the image control means (9) through the short focus lens (7) and the lens module (5), and the photographing is performed. After adjusting the relative positions of the lens module (5) and the light receiving element (3) based on the image obtained by (1), the lens module (5) and the light receiving element (3) are integrally assembled. A method of assembling an electronic imaging device. 2. The lens module (5) and a light receiving element as set forth above.
An assembly adjustment means (12) is connected to at least one of (3), and an image electronically captured by the light receiving element (3) and the image control means (9) is used as the assembly adjustment means (12). The method of assembling the electronic image pickup device according to claim 1, wherein the electronic module is fed back to and the relative position of the lens module (5) and the light receiving element (3) is adjusted based on the feedback. 3. An inspection method for determining focusing accuracy of an electronic image pickup device (1) comprising a light receiving element (3) and a lens module (5), wherein a test is performed in front of the lens module (5). Subject (6)
And the short focus lens (7) between the lens module (5) and the test subject (6), and the image control means (9) is connected to the light receiving element (3). , The test subject (6) is electronically photographed by the light receiving element (3) and the image control means (9) through the short focus lens (7) and the lens module (5), and the photographing is performed. A method for inspecting an electronic image pickup device, comprising: determining focusing accuracy based on a captured image. 4. A device for assembling an electronic image pickup device in which a light receiving element (3) and a lens module (5) are integrally assembled, the test subject (6), a short focus lens (7) and an image control means.
(9) and the test subject (6) is placed in front of the lens module (5), and the lens module (5)
The short focus lens (7) is arranged between the test subject (6) and the test subject (6), and the image control means (9) is connected to the light receiving element (3). ) Is the short focus lens (7) above
The relative position between the lens module (5) and the light receiving element (3) is determined based on the image electronically taken by the light receiving element (3) and the image control means (9) via the lens module (5). An electronic image pickup apparatus assembling apparatus, which is configured to be adjustable. 5. The lens module (5) and a light receiving element as set forth above.
The assembly adjustment means (12) is linked to at least one of (3) and the assembly adjustment means (12) of the image electronically taken by the light receiving element (3) and the image control means (9). ) Based on the feedback to the lens module (5) and the light receiving element
The electronic image pickup apparatus assembling apparatus according to claim 4, wherein the relative position to (3) is adjustable. 6. An inspection device for determining the focusing accuracy of an electronic image pickup device (1) comprising a light receiving element (3) and a lens module (5), comprising a test subject (6) and a short focus lens (6). 7) and image control means
(9) and the test subject (6) is placed in front of the lens module (5), and the lens module (5)
The short focus lens (7) is arranged between the test subject (6) and the test subject (6), and the image control means (9) is connected to the light receiving element (3). ) Is the short focus lens (7) above
Via the lens module (5) and the light receiving element (3) described above.
And based on the image electronically taken by the image control means (9),
An inspection apparatus for an electronic image pickup device, characterized in that it is configured to be able to determine focusing accuracy.