JP2020140018A - Camera module adjustment device and camera module adjustment method - Google Patents

Abstract

To provide a camera module adjustment method and a camera module adjustment device, capable of shortening the adjustment time of a camera module by deciding the movement direction of a focusing position on the basis of the determination results of the amount and direction of the defocus of a light pattern.SOLUTION: A camera module adjustment device 10 includes a pattern 11c for converting light emitted from a light source into a first light pattern which is parallel light and the vertical axis of the pattern is inclined by a predetermined angle. The camera module includes a camera lens 12a for condensing the parallel light to the focusing position existing on an optical axis and an imaging element 12b by which a second light pattern obtained by imaging the parallel light by the camera lens is formed. The image data of the second light pattern outputted from the imaging element is analyzed, the defocus amount of the second light pattern and the direction of the defocus amount are measured, and the movement direction and movement amount of the imaging element are decided on the basis of the defocus amount.SELECTED DRAWING: Figure 9

Description

The present invention relates to a camera module adjusting device and a camera module adjusting method. In particular, the present invention determines the perspective of the distance between the image sensor and the camera lens by inclining the pattern forming the image formed on the image sensor of the camera module with respect to the optical axis and analyzing the image. It relates to a camera module adjusting device and a camera module adjusting method which can be performed.

Conventionally, in the manufacturing process of an image input device such as a camera module, focus adjustment is performed between an image sensor composed of a CCD (Charge Coupled Device), a CMOS (Complementary Metal-Node Semiconductor), or the like, and a lens unit. A camera module is a component (device) that integrates a substrate on which an image sensor is mounted and a lens unit for imaging, and is not only a digital camera but also various portable electronic devices with a camera function (for example, a portable device). It is installed in telephones, portable PCs, PDAs, etc.). When manufacturing a camera module, the lens unit is held while adjusting the focus on the image pickup surface (light receiving surface) of the image sensor, and the lens unit and the substrate are integrally fixed in the state where the focus is adjusted. It is known. Regarding such a technique, for example, JP-A-2003-315650 (Patent Document 1) and JP-A-2002-267923 (Patent Document 2) use a test chart (chart paper) having a chart portion. A technique for detecting an optimum focus position by imaging a test chart while moving the lens unit and calculating an MTF (Modulation Transfer Function) from the captured data is disclosed.

Here, FIG. 1 shows an example of a schematic diagram of the conventional camera module adjusting device 100. As shown in FIG. 1, the camera module adjusting device 100 includes a collimating light source 101, a camera module 102, an image processing unit 103, a control unit 104, and a Z stage 105. Further, the camera module 102 includes a camera lens 102a and an image pickup element 102b.

Further, the function of each configuration of the camera module adjusting device 100 and the relationship between the configurations will be briefly described.

First, the collimating light source 101 projects a test pattern (two-dimensional light pattern) onto the camera module 102.

Next, the image sensor 102b converts the light pattern imaged by the camera lens 102a into an electric signal and outputs it to the image processing unit 103.

At the stage before adjusting and fixing the position of the camera lens 102a, the position of the camera lens 102a in the optical axis direction with respect to the image sensor 102b is generally not accurately set. Therefore, at this stage, the image of the light pattern is out of focus due to the defocused state of the camera module 102. In order to evaluate the amount of defocus (for example, the closer the image sensor 102b is to the in-focus position of the camera lens 102a, the closer the evaluation value is to 0 (zero)), the characteristics of the received out-of-focus light pattern image are evaluated to defocus. The focus amount is reduced so that the defocus amount, which is in the just-focused state, becomes 0 (zero).

That is, the image processing unit 103 calculates the defocus amount based on the image data obtained by converting the electric signal (image signal) indicating the optical pattern. Then, the image processing unit 103 analyzes the image signal transmitted from the image sensor 102b to determine the degree of focusing.

Further, following the image signal analysis processing by the image processing unit 103, the image processing unit 104 calculates a control command value for controlling the height of the Z stage 105 based on the defocus amount, and outputs the control command value to the Z stage 105. To do.

Finally, the Z stage 105 adjusts the height of the image sensor 102b based on the control command value.

Through the above operations, the distance between the camera lens 102a and the image sensor 102b in the camera module 102 is adjusted.

Next, the detailed optical structure of the collimator light source 101 and the optical path of the light rays in the camera module 100 will be described with reference to FIG.

The collimator light source 101 includes a light source 101a, a diffuser plate 101b, a light transmission pattern (hereinafter, simply referred to as "pattern" or "lectil") 101c, and a collimator lens 101d.

First, the light emitted from the light source 101a is converted into uniform diffused light by the diffuser plate 101b.

The pattern 101c has a two-dimensional pattern divided by an opening (or a transmitting portion) H ₀ that transmits diffused light and a light-shielding portion that blocks diffused light without transmitting it. A pinhole-shaped opening H ₀ is formed substantially in the center of the pattern 101c, and a part of the light passing through the diffuser plate 101b can pass through the opening H ₀ . For example, a simple example of pattern 101c can be a circular opening with radius r. A part of the diffused light passes through the opening H ₀ of the pattern 101c and enters the collimator lens 101d.

Next, the collimator lens 101d is arranged apart from the pattern 101c by the focal distance f _L of the collimator lens 101d. Therefore, the collimator lens 101d emits a light beam obtained by converting the incident light into a parallel light beam to the camera module 102. Then, the parallel light rays emitted from the collimator lens 101d are incident on the camera lens 102a.

Further, the image sensor 102b is arranged apart by the focal length f _C of the camera lens 102a.

Here, the defocus amount and the code of the defocus amount are supplemented as follows. When the defocus amount is represented by Δ as described later, the magnitude of the defocus amount Δ is represented by | Δ |. Further, in a state where the imaging position of the light ray (subject) from the opening 101c is located on (front) the surface of the image sensor 102b (hereinafter, referred to as "front pin state"), the defocus amount is increased. The sign is negative (Δ <0). On the contrary, in the case where the imaging position of the light beam from the opening 101c is located below (backward) the image sensor surface (hereinafter, referred to as “rear pin state”), the sign of the defocus amount is It is positive (plus) (Δ> 0). The defocus amount Δ is 0 when the imaging position of the light beam from the opening 101c is located on the imaging surface, that is, in the in-focus state.

Further, FIG. 3 shows a state in which a focused (focused) image is formed on the light receiving surface of the image sensor 102b by the camera lens 102a after the adjustment of the camera module 102. Further, FIG. 4 shows an image in focus (focused) on the light receiving surface of the image sensor 102b. As shown in FIG. 4, a light spot having a small diameter D1 is observed in the center of the screen. Then, a state showing an image in focus (focused) on the light receiving surface of the image sensor 102b is called "Just". The defocus amount Δ at this time is zero.

Next, FIG. 5 shows a state in which the focusing position G on the light receiving surface of the image sensor 102b does not reach (out of focus) due to the light transmitted through the camera lens 102a in a state where the camera module 102 needs to be adjusted. .. That is, FIG. 6 shows an image in which the focusing position G does not reach the light receiving surface of the image sensor 102b (in a defocused state where the image sensor 102b is out of focus). As shown in FIG. 6, a light spot having a diameter of D2 (> D1) larger than D1 is observed in the center of the screen. Then, the defocused state where the focusing position G does not reach the light receiving surface of the image sensor 102b (out of focus), that is, the focusing position G is located on the side of the camera lens 102a when viewed from the image sensor 102b. Is called "Far". The sign of the defocus amount Δ at this time is negative (minus).

Further, FIG. 7 shows a state in which the focusing position G is located on the opposite side of the camera lens 102 (out of focus) when viewed from the image sensor 102b. That is, FIG. 8 shows an image of the defocused state in which the focusing position G is located on the opposite side of the camera lens 102 (out of focus) when viewed from the image sensor 102b. As shown in FIG. 8, a light spot having a diameter of D3 (> D1) larger than D1 is observed in the center of the screen. Then, the in-focus position G passes through the light receiving surface of the image sensor 102b and is located below the image sensor 102b (out of focus), that is, the in-focus position G is from the image sensor 102b. As seen, the state of being located on the opposite side of the camera lens 102a is referred to as "Near" with respect to "Far". The sign of the defocus amount Δ at this time is positive (plus).

When adjusting the distance between the camera lens 102a of the camera module 102 and the image sensor 102b, the Z stage is usually moved up and down so as to change from the state where "Near" or "Far" is detected to the state where "Just" is detected. Adjustments are made to move to.

Japanese Unexamined Patent Publication No. 2003-315650 JP-A-2002-267923

In the conventional camera module 102, when the image data of the widened light spot as shown in FIG. 6 or 8 is acquired, the relationship between the focusing position G and the image sensor 102b will be described as follows.

From the image data, the focusing position G exists on the side of the camera lens 102a when viewed from the image sensor 102b, and the focusing position G exists on the opposite side of the camera lens when viewed from the image sensor 102b. It is not possible to determine which of the "Near" states the lens is in. Therefore, in principle, it is impossible to determine whether to move the focusing position G in the direction closer to the image sensor 102b or to move the focusing position G away from the image sensor 102b. Is. That is, in the conventional camera module adjusting device or method, it is impossible in principle to determine the sign of the above-mentioned defocus amount Δ. Then, when any of the signs of the defocus amount Δ is tentatively selected and the focus position G is moved, the degree of “Near” or “Far” is increased, and contrary to expectations, the defocus amount Δ is further increased. May increase.

In such a case, there arises a problem that the measurement time or the control time is extended due to the extra step of moving the focusing position in the opposite direction again.

The present invention has been made based on the above circumstances, and an object of the present invention is to analyze image data of an optical pattern formed on an image sensor by inclining a pattern or lectyl with respect to an optical axis. Then, the defocus amount of the optical pattern and its direction (whether the focusing position G is "Near" or "Far") are determined, and the moving direction of the focusing position G is determined based on the determination result. It is an object of the present invention to provide a camera module adjusting method and a camera module adjusting device capable of shortening the adjusting time of the camera module.

The object of the camera module adjusting device according to the present invention is a camera module adjusting device having a collimating light source unit, a camera module, an image processing unit, a control unit and a Z-axis drive unit, and the collimating light source unit includes a light source and a light source. A pattern that converts the emitted light of the light source into a first light pattern and a collimeter lens that converts the first light pattern incident from the pattern into parallel light rays are provided, and the vertical axis of the pattern is the collimating light source. A camera lens that is tilted by a predetermined angle with respect to the optical axis of the unit or the camera module, and the camera module focuses the parallel light beam to a focusing position existing on the optical axis, and the camera lens. The image processing unit includes an image pickup element on which a second light pattern in which the parallel light rays are formed is formed, and the image processing unit analyzes the image data of the second light pattern output from the image pickup element. The defocus amount of the second optical pattern and the sign of the defocus amount are measured, and the control unit determines the moving direction of the image pickup element based on the defocus amount and the sign, and the image pickup element. It is possible to reduce the adjustment time until the Z-axis drive unit substantially coincides with the light receiving surface of the image pickup element based on the movement direction and the movement amount. Achieved by.

Further, the object of the camera module adjusting device according to the present invention is that the Z-axis drive unit includes an image pickup element holding unit that holds or loads the image pickup element, and the light is based on the movement direction and the movement amount. By moving the imaging element in the axial direction, or the pattern has at least three openings and is arranged such that the center of one opening and the focal point of the collimator lens are substantially aligned. Because of this, or because the opening is a substantially circular pinhole, or when the focusing position substantially coincides with the light receiving surface, the first opening and the second opening, which are different from the opening, respectively. The first in-focus point in which the opening and the third opening are set and the first light beam transmitted through the first opening is focused is located on the side of the camera lens when viewed from the image pickup element. The second in-focus point where the second light beam transmitted through the second opening is focused is located on the light receiving surface of the image pickup element, and the third light beam transmitted through the third opening is located on the light receiving surface. The third in-focus focus is more effectively achieved by being on the opposite side of the camera lens as viewed from the image pickup element.

The object of the camera module adjusting method according to the present invention is a camera module adjusting method having a collimating light source unit, a camera module, an image processing unit, a control unit and a Z-axis drive unit, and the collimating light source unit is a light source and a pattern. Converts the emitted light of the light source into a first light pattern, and the collimeter lens converts the first light pattern incident from the pattern into parallel light rays, and the vertical axis of the pattern is the collimating light source. The camera module is tilted by a predetermined angle with respect to the optical axis of the unit or the camera module, and the camera module collects the parallel light rays to a focusing position existing on the optical axis by the camera lens, and the image pickup element. A second optical pattern in which the parallel rays are imaged is formed by the camera lens, and the image processing unit analyzes the image data of the second optical pattern output from the imaging element, and the second optical pattern is analyzed. The defocus amount of the optical pattern and the sign of the defocus amount are measured, the movement direction of the image pickup element is determined by the control unit based on the defocus amount and the sign, and the movement amount of the image pickup element is determined. Is calculated, and the Z-axis drive unit can shorten the adjustment time until the focusing position substantially coincides with the light receiving surface of the image pickup element based on the moving direction and the moving amount. To.

Further, the object of the camera module adjusting method according to the present invention is to hold or load the image pickup element by the image pickup element holding section in the Z-axis drive unit, and based on the movement direction and the movement amount, the optical axis. By moving the imaging element in a direction, or the pattern has at least three openings and is arranged such that the center of one opening and the focal point of the collimator lens are substantially aligned. By this, or because the opening is a substantially circular pinhole, or when the focusing position substantially coincides with the light receiving surface, the first opening and the second opening that are different from the opening, respectively. The first focal point in which the portion and the third opening are set and the first light beam transmitted through the first opening is focused is located on the side of the camera lens when viewed from the imaging element. The second in-focus point where the second light beam transmitted through the second opening is focused is on the light receiving surface of the image pickup element, and the third light beam transmitted through the third opening is in focus. The third focal point to be focused is more effectively achieved by being on the opposite side of the camera lens as viewed from the imaging element.

According to the camera module adjusting method and the camera module adjusting device according to the present invention, the pattern or lectyl is tilted with respect to the optical axis, and the image data of the optical pattern formed on the image sensor is analyzed to analyze the optical pattern. Defocus amount and its direction or sign (whether the focusing position G is "Near" or "Far") are determined, and the moving amount of the focusing position and its direction are determined based on the determination result. As a result, the number of times the distance between the camera lens and the image sensor can be adjusted can be adjusted almost once, which is a special effect.

It is a block diagram of the conventional camera module adjustment device. It is a schematic diagram of the collimator light source and the camera module of the conventional camera module adjustment device. It is a figure which shows the state which the focused (focused) image was formed on the light receiving surface of an image sensor by a camera lens after adjustment of a conventional camera module. FIG. 3 is a diagram showing an image in focus (in focus) on the light receiving surface of the image sensor. The figure which shows how the focusing position G of the light transmitted through a camera lens is located (out of focus) on the camera lens side as seen from the light receiving surface of an image sensor 102b before the adjustment of a conventional camera module. Is. FIG. 5 is a diagram showing an image of a defocused state in which the light receiving surface of the image sensor is out of focus (out of focus). It is a figure which shows the state of the defocus state in which the focusing position G is located on the opposite side (out of focus) of a camera lens when viewed from the light receiving surface of an image sensor 102b before adjustment of a conventional camera module. .. FIG. 7 is a diagram showing an image of a defocused state in which the light receiving surface of the image sensor is out of focus (out of focus). It is a schematic diagram of the collimator light source and the camera module of the camera module adjustment device which concerns on 1st Embodiment of this invention. It is a figure which shows the pattern (rectil) in the camera module adjustment apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the positional relationship between the focusing position G _Near , the focusing position G _Just , and the focusing position G _Far, and the image sensor when the distance between the camera lens and the image sensor is closer than the focusing distance. .. In the positional relationship between the camera lens and the image sensor as shown in FIG. 11, the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far are each light spot focused on the light receiving surface of the image sensor. It is a figure which shows the state (size relation) of. It is a figure which shows the positional relationship between the focusing position G _Near , the focusing position G _Just , and the focusing position G _Far, and the image sensor when the distance between the camera lens and the image sensor is farther than the focusing distance. .. In the positional relationship between the camera lens and the image sensor as shown in FIG. 13, the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far are each light spot focused on the light receiving surface of the image sensor. It is a figure which shows the state (size relation) of. It is a figure which shows the positional relationship between the focusing position G _Near , the focusing position G _Just , and the focusing position G _Far, and the image sensor when the distance between the camera lens and the image sensor is exactly the distance in focus. .. In the positional relationship between the camera lens and the image sensor as shown in FIG. 15, the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far of each light spot focused on the light receiving surface of the image sensor. It is a figure which shows the state (size relation). It is a flowchart which shows the process performed by the camera module adjustment apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the relationship between the defocus amount Δ (<0) and the blur amount W in the front pin state. It is a figure which shows the relationship between the defocus amount Δ (> 0) and the blur amount W in the rear pin state. It is a figure which shows the state which the pattern (rectil) in the camera module adjusting apparatus which concerns on 2nd Embodiment of this invention is seen from the front. It is a figure which shows the state that the pattern (rectil) is inclined with respect to the optical axis in the camera module adjustment apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the image formation relation of the diffused light emitted from the optical axis AL which is separated by the distance d from the focal length f _L of a collimator lens in the camera module adjustment apparatus which concerns on 2nd Embodiment of this invention. In the camera module adjusting device according to the second embodiment of the present invention, the brightness distribution and the brightness of the brightness distribution in the band-shaped integration area having a predetermined width S on the image sensor due to the light rays transmitted through the opening of the rectil. It is a figure which shows the state of the trapezoidal width We which shows the inclination width (image spread width). It is a figure which shows the plotting state of the trapezoidal width We of FIG.

The camera module adjusting device according to the present invention tilts the pattern or lectil with respect to the optical axis, analyzes the image data of the optical pattern imaged on the image sensor, and defocuses the image of the optical pattern Δ. , And its direction or sign (whether the focusing position G is "Near" or "Far") is determined, and the moving direction of the focusing position G is determined based on the determination result. It has the special effect of being able to adjust the distance between the image sensor and the image sensor almost once.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified below. That is, the present invention can be implemented with various modifications (combining each embodiment, etc.) within a range that does not deviate from the gist thereof. Further, in the description of the following drawings, the same or similar parts are designated by the same or similar reference numerals. The drawings are schematic and do not necessarily match the actual dimensions and ratios. Even between drawings, parts with different dimensional relationships and ratios may be included.

[First Embodiment]
<Camera module adjustment device configuration and focus position determination method>
First, the principle of the first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 9, the camera module adjusting device 10 according to the first embodiment has a plurality of patterns inclined with respect to the optical axis with respect to the conventional camera module adjusting device 100 as shown in FIG. It differs in that the opening is drilled, but is almost the same in the other points. Although the description of the components common to the camera module adjusting device 10 according to the first embodiment and the conventional camera module adjusting device as shown in FIGS. 1 and 2 will be omitted, the first embodiment will be used. The components of the camera module adjusting device 10 are designated by different reference numerals in order to clearly distinguish them from the components of the conventional camera module adjusting device 100.

First, FIG. 9 shows the optical structure and optical path of the collimator light source 11 and the camera module 12. As shown in FIG. 10, the pattern 11c in the camera module adjusting device 10 according to the first embodiment has three openings, and the three openings have substantially the same diameter D _pattern . However, they are connected in a straight line. Specifically, the opening H _Near closest to the collimator lens 11d, the opening H _Just located on the optical axis just by the focal length f _L of the collimator lens 11d, and the opening H _Far farthest from the collimator lens 11d. Is.

Further, the paths of the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far are modeled as (optical path) L _Near , light ray (optical path) L _Just , and light ray (optical path) L _Far , respectively. Is shown in FIG.

The collimator light source 11 in the camera module adjusting device 10 according to the first embodiment of the present invention comprises a light source 11a, a diffuser plate 11b, a pattern 11c, and a collimator lens 11d, and has the same configuration as that of the conventional camera module adjusting device 100 described above. Corresponding.

However, since the pattern 11c is inclined with respect to the optical axis, the distances between the opening H _Near , the opening H _Just , and the opening H _Far and the collimator lens 11d are different from each other. Therefore, in the camera module 12, the light rays transmitted through the three openings are focused at different distances from the camera lens 12a. That is, as shown in FIG. 9, the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far pass through different optical paths, and have different focusing positions G _Far , focusing position G _Just , and so on. And the image is formed at the focusing position G _Near .

Next, FIG. 11 shows the positional relationship between the camera lens 12a and the image sensor 12b when the distance is shorter than the in-focus distance. As shown in FIG. 11, the focusing position G _Near is substantially located on the light receiving surface of the image sensor 12b, and the focusing position G _Just is located on the lower surface of the image sensor 12b, and the focusing position G _Far. Is located on the lower side away from the image sensor 12b. FIG. 12 shows the state of each light spot of the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far on the light receiving surface of the image sensor 12b. As shown in FIG. 12, the diameters of the light spots of the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far are observed as the diameter D _Near , the diameter D _Just , and the diameter D _Far , respectively. To. As described above, when the distance between the camera lens 12a and the image sensor 12b is shorter than the in-focus distance, the magnitude relationship of diameter D _Near <diameter D _Just <diameter D _Far is observed.

Next, FIG. 13 shows the positional relationship between the focusing position G _Near , the focusing position G _Just , and the focusing position G _Far when the distance between the camera lens 12a and the image sensor 12b is farther than the in-focus distance. Shown in. As shown in FIG. 13, the focusing position G _Far is substantially located on the light receiving surface of the image sensor 12b, and the focusing position G _Just is located above the image sensor 12b and is in the focusing position. The G _Near is located farther from the image sensor 12b than the focusing position G _Just . Further, FIG. 14 shows the state of each light spot of the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far on the light receiving surface of the image sensor 12b. As shown in FIG. 14, when the distance between the camera lens 12a and the image sensor 12b is farther than the in-focus distance, the magnitude relationship of diameter D _Near > diameter D _Just > diameter D _Far is observed. Regarding the magnitude relationship between the diameter D _Near , the diameter D _Just, and the diameter D _Far , the distance between the camera lens 12a and the image sensor 12b is opposite when it is farther than the in-focus distance and when it is closer.

In the conventional camera module adjusting device 100, even when the distance between the camera lens 12a and the image sensor 12b is shorter than the in-focus distance, the distance between the camera lens 12a and the image sensor 12b is the in-focus distance. Even when it was farther away, it was not observed as a difference in the diameters of the light spots, as shown in FIGS. 3-6.

However, in the camera module adjusting device 10 according to the first embodiment, whether the distance between the camera lens 12a and the image sensor 12b is closer or farther than the in-focus distance is determined by the diameter D _Near , the diameter D _Just, and the diameter D _Just. By observing the magnitude relationship of the diameter D _Far , it has a special effect that it can be easily determined.

Further, when the distance between the camera lens 12a and the image sensor 12b is substantially in focus, the positional relationship between the focusing position G _Near , the focusing position G _Just , and the focusing position G _Far is shown in FIG. As shown in FIG. 15, the focusing position G _Just is substantially located on the light receiving surface of the image sensor 12b, and the focusing position G _Near is located above the image sensor 12b. On the other hand, the focusing position G _Far is located below the image sensor 12b. FIG. 16 shows the state of each light spot of the light rays emitted from the opening H _Near , the opening H _Just , and the opening H _Far on the light receiving surface of the image sensor 12b. As shown in FIG. 16, when the camera lens 12a and the image sensor 12b are substantially in focus, a magnitude relationship of diameter D _Near to diameter D _Far > diameter D _Just is observed.

Further, in the camera module adjusting device 10 according to the first embodiment, the fact that the distance between the camera lens 12a and the image sensor 12b is in focus is the diameter of each light spot of the light beam emitted from each opening. The magnitude relationship, that is, the diameter D _Near and the diameter D _Far are substantially equal, and the diameter D _Just has a special effect of being detected as a special order of being smaller than the diameter D _Near and the diameter D _Far .

<Adjustment flow of camera module adjustment device>
Next, the operation flow 10 of the camera module adjusting device will be described with reference to the flowchart shown in FIG.

First, the camera module 12 is installed at a predetermined position (step S10).

Next, the light source 11a is turned on and the camera module 12 is irradiated with light rays (step S20).

Subsequently, the image sensor 12b outputs an image signal to the image processing unit 13 (step S30).

Next, the image processing unit 13 analyzes the image data obtained by converting the image signal (electric signal) indicating the light pattern, and calculates the diameter of each light spot (step S40).

Further, based on the magnitude relationship of the diameter of each light spot, the defocus amount Δ (for example, the evaluation value that the closer the image sensor 12b is to the in-focus position of the camera lens 12a, the closer to 0 (zero)) is set by the image processing unit. 13 is calculated (step S40).

Next, the image processing unit 13 determines whether or not the image sensor 12b has a “Near” relationship with the camera lens 12a by using the defocus amount Δ based on the magnitude relationship of the diameters of the respective light spots. (Step S50). Here, if the determination result in step S50 is Yes, the control command value step is set to a negative value (<0) so as to move the camera lens 12a away from the image sensor 12b (step S60). If the determination result in step S50 is No, the process proceeds to step S80, which will be described later (step S50).

Then, the control unit 14 drives the Z-axis stage 15 based on the control command value step (step S70).

Next, the image processing unit 13 determines whether or not the image sensor 12b has a “Far” relationship with the camera lens 12a by using the defocus amount based on the magnitude relationship of the diameters of the respective light spots. (Step S80).

Then, if the determination result in step S80 is Yes, the control command value step is set to a positive value (> 0) so that the camera lens 12a comes closer to the image sensor 12b (step S90).

Then, the control unit 14 drives the Z-axis stage 15 based on the control command value step (step S70).

If the determination result in step S80 is No, the process proceeds to step S100, which will be described later (step S100).

Next, the image processing unit 13 determines whether or not the image sensor 12b has a “Just” relationship with the camera lens 12a by using the defocus amount Δ based on the magnitude relationship of the diameters of the respective light spots. (Step S100). Here, if the determination result in step S100 is No, the process returns to step S30 described above (step S100). If the determination result in step S100 is Yes, the process of adjusting the camera module 12 installed in step S10 ends.

[Second Embodiment]
Next, the camera module adjusting device 20 according to the second embodiment will be described with reference to FIGS. 18 to 24.

The camera module adjusting device 20 according to the second embodiment has the optical parameters (specifications) of the optical components of the camera module adjusting device, the arrangement between the optical components, and the arrangement between the optical components with respect to the camera module adjusting device 10 according to the first embodiment. The difference is that the defocus amount Δ and the blur amount W (for example, the spread width or the diameter of the light spot) are calculated using the distance, but the other configurations are substantially the same. Therefore, the components common to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

First, the relationship between the defocus amount Δ and the blur amount W is shown in FIGS. 18 and 19. FIG. 18 shows a state in which a light spot having a blur amount W is irradiated on the image sensor 12b by locating the focal point G between the image sensor 12b and the camera lens 12a. Since the focal point G of the camera lens 12a is in a position before the image sensor 12b, that is, the "front pin state", the defocus amount Δ at this time is a negative value. Further, FIG. 19 shows how the image sensor 12b is positioned between the camera lens 12a and the focal point G, so that the light spot having a blur amount W is irradiated on the image sensor 12b. Since the focal point G of the camera lens 12a is in a position after the image sensor 12b, that is, in the "rear pin state", the defocus amount Δ at this time is a positive value. From the optical paths shown in FIGS. 18 and 19, the absolute values of the amount of blur W and the amount of defocus Δ are in a substantially proportional relationship. Therefore, the defocus amount Δ and its sign can be estimated by measuring the physical quantity corresponding to the blur amount W (for example, the diameter of the light spot, the brightness, the shape of the brightness distribution, the change in the brightness distribution, etc.).

Next, FIG. 20 shows a front view of the pattern (lectil) 11c'. As shown in FIG. 20, the pattern (lectil) 11c'has a plurality of substantially rectangular openings 11c-A, 11c-B, 11c-C, 11c-D, 11c-E (hereinafter, 11c-A to 11c). (Abbreviated as -E) is installed.

Next, FIG. 21 shows how the pattern (lectil) 11c is tilted with respect to the optical axis AL. As shown in FIG. 21, the angle at which the pattern (lectil) 11c'is inclined with respect to the vertical plane of the optical axis AL is defined as the inclination angle θ.

Then, in order to show the imaging relationship between the collimating light source 11 and the camera module 12 or the position of the optical element, orthogonal coordinates (XYZ orthogonal coordinate system) as shown in the upper right of FIG. 21 are set. At that time, the Z axis is set parallel to the optical axis AL. Further, the XY plane is set perpendicular to the Z axis. Further, the inclination angle with respect to the XY plane is θ. The X-axis is set in the direction perpendicular to the paper surface, and the Y-axis is set parallel to the paper surface and perpendicular to the X-axis and the Y-axis.

Further, as described above, the pattern (lectil) 11c'has a substantially rectangular opening 11c-A. Therefore, when the pattern (lectil) 11c'is arranged on the XY plane, the opening 11d'is arranged on the XY plane.

On the other hand, when the pattern (lectil) 11c'is tilted by the tilt angle θ, the rotation axis of the opening 11c-A arranged on the rotation center axis O parallel to the X axis is substantially immovable. As shown, the openings 11c-B and 11c-C away from the rotation center axis O are separated from the XY plane by a distance d. The center of rotation of the opening 11c-A at the center of the pattern 11c'is on O on the rotation center axis even when the pattern 11c' is rotated. Further, the collimator lens 11d is arranged so as to be separated from the rotation center axis O by the focal length f _L of the collimator lens 11d. Therefore, the light ray (optical path) L _{Just that} has passed through the opening 11c-A in the central portion of the pattern 11c is converted into a substantially parallel light ray by the collimator lens 11d without depending on the inclination angle θ of the pattern 11c'.

On the other hand, when the pattern 11c'is rotated, the opening 11c-B away from the central portion of the pattern 11c is separated from the XY plane in the positive direction of the Z axis by a distance d as described above. Further, when the pattern 11c'is rotated, the other opening 11c-C from the rotation center axis O of the pattern 11c' is separated from the XY plane by a distance d in the negative direction of the Z axis as described above.

Therefore, depending on the inclination of the pattern 11c', the light ray (optical path) L _Near transmitted through the opening 11c-B closer to the focal length f _C of the collimator 11d is the opening 11c farther than the focal length f _C of the collimator lens 11d. Even if the light ray (optical path) L _Far transmitted through −C is transmitted through the collimator lens 11d, it is emitted as a slightly diffused light ray instead of a parallel light ray. Further, the light ray (optical path) L _Far transmitted through the opening 11c-B away from the rotation center O of the pattern 11c'is emitted not as a parallel light ray but as a slightly focused light ray even if it passes through the collimated lens 11d. In this way, the light rays transmitted through the openings 11c-B and 11c-C away from the center of rotation O are emitted as light rays that are slightly diffused or focused according to the inclination angle θ of the pattern 11c'.

Next, the light rays transmitted through the openings 11c-A, 11c-B and 11c-C, that is, the light rays (optical path) L _Just , the light rays (optical path) L _Near , and the light rays (optical path) L _Far are imaged by the camera module 12. The amount of blurring (hereinafter referred to as "spread width") W of the image (light spot) formed on the element 12b is calculated from the optical path in the collimating light source 11 and the camera module 12.

Here, FIG. 22 shows the imaging relationship of the diffused light emitted from the optical axis AL at a distance d from the focal length f _L of the collimator lens 11d. In this case, the distance H corresponds to the image height of the opening H _Far .

Here, the symbols of the optical parameters (for example, focal length, magnification, positional relationship, etc. of the optical element) used for the optical path calculation of the ray (optical path) L _Near , the ray (optical path) L _Just , and the ray (optical path) L _Far are used. The meaning, the symbol of the optical characteristic value (defocus amount), and their definition or meaning will be described below. The unit is omitted.

H: Image height of opening H _Far or image height of opening H _Near f _L : Focal length of collimator lens 11d.

f _C : Focal length of the camera lens 12a.

d: Distance (amount of deviation) from the XY plane including the rotation center axis O to the opening H _Far . The direction approaching from the lens is positive.

b: The distance at which the diffused light emitted from the opening H _Far (hereinafter referred to as “opening H _Far diffused light”) is focused by the collimator lens 11d with reference to the center of the collimator lens 11d. The sign of b is positive (> 0) when the sign of the deviation amount d is positive (> 0).

L: Distance between the collimator lens 11d and the camera lens 12a.

Δ: Defocus amount (Note that the opening H _Far diffused light means that the diffused light is focused at a position separated from the camera lens 12a by a distance (fc + Δ).

W: “Expansion width” (corresponding to “blurring amount”) of the light spot when the opening H _Far diffused light is installed behind the distance (fc + Δ). Note that Δ is the amount of defocus.

Δ': Defocus amount when a light spot having a spread width W is formed (Note that this is the distance at which the image sensor 12b is displaced (shifted) with reference to a position separated by the focal length fc of the camera lens 12a. .)

Next, the positional relationship between the pattern 11c, the collimator lens 11d, the camera lens 12a, and the image sensor 12b in the camera module adjusting device 20 according to the second embodiment will be described.

First, as shown in FIG. 22, the image sensor 12b in which the pattern of the openings 11c-A to 11c-E of the pattern (rectyl) 11c'focuses on the light receiving surface of the image sensor 12b is deviated from the focal length fc. The focal length (correction amount) is Δ.

Further, the openings 11c-A to 11c-E of the pattern (rectyl) 11c'are located at a distance (f _L + d) from the collimator lens 11d. Therefore, the light emitted from the light source 11a is not converted into parallel light rays, but is focused on the optical axis AL at a position separated from the collimator lens 11d by a distance b. After that, the light emitted from the collimator lens 11d is focused by the camera lens 12a at a distance (fc + Δ) from the camera lens 12a.

Here, when the light receiving surface of the light receiving element 12d is located at a distance Δ'from the distance fc, the images of the openings 11c-A to 11c-E on the light receiving surface are out of focus and spread. Blurred by the width W (may be called "bleeding").

First, the imaging relationship on the collimating light source 11 side as shown in FIG. 22 is as follows according to the lens formula (imaging formula), using the focal length f _L , the distance b, and the amount of deviation d. Can be described as

Similarly, the imaging relationship on the camera module 12 side as shown in FIG. 22 is as shown in Equation 2 below, using the focal length fc, the distance L, the distance b, and the defocus amount Δ according to the lens formula. Can be described.

Next, the defocus amount Δ is derived using Equations 1 and 2.
Here, the defocus amount Δ when the pattern 11c is rotated so that the opening H _Far is located at a position separated by the deviation amount d from the XY plane including the rotation center O of the pattern 11c is derived. To do.

By transforming Equation 1 and rearranging the numerator and denominator, Equation 3 is obtained.

Next, by reciprocaling both sides of Equation 3, the Equation 4 representing the distance b can be obtained using the focal length f _L , the focal length f _C, and the amount of deviation d.

Next, by transforming Equation 2, the focal length f _C , the amount of deviation d, and the amount of defocus Δ are used to determine the distance from the position where the light rays emitted from the collimator lens 11d are focused to the center of the camera lens 12a. The number 5 representing the reciprocal of a certain distance bL is obtained.

Then, by taking the reciprocal of both sides of the equation 5, the equation 6 representing the distance b-L is obtained.

Then, by transposing the left side L of the equation 6 to the right side and rearranging the right side, the equation 7 representing the distance b can be obtained by using the focal length f _C , the distance L, and the defocus amount Δ.

Further, by eliminating the distance b from the equations 4 and 7, the equation 8 including the deviation amount d can be obtained.

By rearranging Equation 8, a mathematical formula such as Equation 9 can be obtained in which the terms including the deviation amount d and the defocus amount Δ are each one.

Then, when the equation 9 is solved for the deviation amount d, the equation 10 shown below is obtained.

Further, the number 11 is obtained by multiplying the denominator and numerator on the right side of the number tens by the defocus amount Δ.

By transforming the number 9, the number 12 is obtained.

Then, the equation 13 is obtained by reciprocaling both sides of the equation 12, dividing both sides by the square of fc, and solving the defocus amount Δ on the left side.

Further, the numerator and denominator on the right side of the number 13 are multiplied by the amount of deviation d to obtain the number 14.

As described above, the defocus amount Δ is calculated using the optical parameters (specifications) of the optical components used in the camera module adjusting device 20 and the arrangement and distance between the optical components by using the lens formula. can do.

Next, a mathematical formula indicating the composite magnification M of the image formed by the reticle 11c'on the light receiving surface of the image sensor 12b of the camera module 12 is derived.

The magnification M _LED of the collimator lens on the light source side can be expressed as the equation 15.

Further, the magnification M _Cam in the camera module 12 can be expressed as the equation 16.

Therefore, the total magnification (composite magnification) M can be expressed by the product of the magnification M _LED and the magnification M _Cam , that is, by using the equations 15 and 16, the equation 17 can be obtained.

Next, the total magnification (composite magnification) M is derived using the deviation amount d.

First, by erasing the distance b from the equations 15 and 4, the equation 18 representing the magnification M _LED is obtained.

Further, by substituting the right side of the equation 4 for the distance b of the equation 16 and the right side of the equation 13 for the defocus amount Δ of the equation 16, the _equation 19 representing the magnification M _Cam can be obtained.

By rearranging the numerator denominator of the number 19, the number 20 is obtained.

By rearranging the numerator and denominator of the number 20, the number 21 is obtained.

By taking the product of the number 21 and the number 18, the number 22 representing the composite magnification M including the deviation amount d can be obtained.

Then, by rearranging the number 22, the number 23 representing the composite magnification M can be obtained.

As described above, the composite magnification M can be calculated from the lens formula and FIG. 22.

It was confirmed that the composite magnification M when the distance d → 0 (infinite system) can be expressed as the equation 24 for verification. Also, the fact that the number 24 is a negative number corresponds to the inversion of the image.

Next, the composite magnification M is derived using the defocus amount Δ.

First, by substituting the right side of Eq. 7 for b of Eq. 15 and substituting the right side of Eq. 11 for d of Eq. 15, the collimator light source side magnification M _LED represented by Eq. 25 can be obtained.

Then, by rearranging the numerator and denominator of equation 25, equation 26 is obtained.

Further, by substituting the right side of the equation 7 into the distance b of the equation 16, the equation 27 representing the magnification M _cam on the camera module side can be obtained.

Then, by rearranging the numerator and denominator of equation 27, equation 28 is obtained.

Then, by multiplying the right side of the equation 26 and the right side of the equation 28, the composite magnification M is obtained as shown in the equation 29.

Then, the composite magnification M when Δ → 0 (infinite system) is expressed as the equation 30 as described above. It should be noted that the fact that the number 30 is a negative number corresponds to the inversion of the image.

Next, the spread width (blurring amount) W of the image of the pattern on the light receiving surface of the camera module 12 is derived by geometrically and optically calculating.

Here, set as follows.

As shown in FIG. 22, the opening 11c located at the image height H in the pattern (lectil) 11c'is focused at a position separated from the focal length f _C of the camera lens 12a by the above-mentioned defocus amount Δ. To image.

Here, when the image sensor 12b is installed at a position separated from the camera lens 12a by a distance (f _C + Δ'), the opening 11c located at the image height H in the pattern (rectil) 11c'is the camera lens 12a. A blurry image is formed at a distance (f _C + Δ') from. The defocus amount (correction amount) Δ'indicates the displacement (distance) from the focal length f _C of the camera lens 12a to the light receiving surface of the image sensor 12b.

The spread width W of the blurred image formation in the arrangement set as described above is calculated.

Further, in FIG. 22, the aperture width of the camera lens 12a (simply referred to as “lens width”) is set to D.

From FIG. 22, the ratio of the spread width W to the aperture width D is the difference between the defocus amount Δ'and the defocus amount Δ with respect to the sum (f _C + Δ) of the focal length fc and the defocus amount Δ of the camera lens 12a. The ratio of (Δ'−Δ) is equal.

Specifically, in FIG. 22, since ΔABO and ΔA'B'O have a similar relationship, it can be derived that the ratios of the corresponding sides are equal.

Therefore, the relationship between the aperture width D, the spread width W, the distance (f _C + Δ), and the distance (Δ'−Δ) of the camera lens is expressed as in Equation 31.

The number 31 is transformed into the number 32 so that W is left on the left side.

Further, the equation 32 is transformed into the equation 33 so that the defocus amount Δ'is left on the left side.

Next, in order to adjust the distance between the camera lens 12a and the image sensor 12b, the camera module 12 calculates the defocus amount Δ or the defocus amount Δ'based on the brightness distribution of the image formation of the lectil 11c'. To explain.

The defocus amount Δ or the defocus amount Δ'is the distance at which the image sensor 12b is displaced (shifted) with reference to a position separated by the focal length fc of the camera lens 12a.

Here, the trapezoidal brightness distribution corresponding to each edge on the image sensor 12b by each edge of the openings 11C-1 to 11C-5 of the lectil 11c'and the brightness inclination width (image spread width) (hereinafter, hereinafter, The state of “trapezoidal width We”) is shown in FIG.

First, each width of the openings 11C-1 to 11C-5 has the same pitch P. The edge that is just in focus (which may also be referred to as the "just pin edge" or "just focus edge") is the rectil center Lc, and the rectil opening located at the end of the openings 11C-5 arranged in the vertical direction. Let Le be the end of the part.

First, a light pattern is irradiated toward the image sensor 12b. Then, in the image sensor 12b, from the region irradiated with the light pattern by the collimating light source 11a, a band-shaped integration area (region) having a predetermined reference length S is photographed for a predetermined time using the image sensor 12b.

As shown in FIG. 23, the direction of the band-shaped integration area (region) is set so that the cumulative brightness of the light transmitted through each opening 11C-1 to 11C-5 of the pattern (lectil) 11c'is obtained. .. The direction of the integration area (for example, the width direction) and the direction of each opening (for example, the long side direction) are set to be rotated by a substantially rotation angle ψ.

Assuming that the direction of the band-shaped integration area (region) is the Y-axis and the intensity of the cumulative brightness is expressed using the X-axis perpendicular to the Y-axis, the intensity distribution of the cumulative brightness (hereinafter referred to as "luminance distribution"). Can be observed as a substantially trapezoidal light pattern, as shown in FIG.

Furthermore, in order to analyze the shape of the substantially trapezoidal luminance distribution, the threshold values thL and thH (the magnitude relation such as Xmax> thH> thL> Xmin) are set between the maximum intensity Xmax and the minimum intensity Xmin of the luminance distribution. Provide. The difference between the X coordinate corresponding to thH and the X coordinate corresponding to thL on the hypotenuse of each trapezoid is the trapezoid width We indicating the width of the hypotenuse of the luminance distribution of the trapezoid.

Using the image sensor 12b, the brightness distribution is measured based on the brightness data taken for a predetermined time. When integrating the amount of light from the openings 11C-1 to 11C-5, it is preferable to set the area where the openings 11C-1 to 11C-5 and the integration area overlap to be substantially square. ..

Then, the trapezoidal width We of the substantially trapezoidal luminance distribution is measured, and a plot of the trapezoidal width We in the Z-axis direction (movement amount or displacement) is shown in FIG. As shown in FIG. 24, the plot of the trapezoidal width We in the Z-axis direction (indicated by “◯” or “⊚” in FIG. 24) is represented as a shape whose inclination changes in a V shape. Therefore, the plot of the trapezoidal width We can be represented by two straight lines L (+) and L (−). In addition, in order to obtain the intersection of the two straight lines L (+) and L (-), the data of one or two trapezoidal width We from the one with the lowest trapezoidal width We shown in FIG. 24 may be excluded. To do.

Then, the calculation method of the defocus amount Δ is shown below.

First, the reference length S is, for example, the distance between the end of the opening 11C-1 and the end of 11C-5 in the reticle diagram of FIG. Further, let L (0) be the intersection of the straight line L (−) and the straight line L (+). Then, the difference d between the intersection point L (0) and the black-and-white edge is calculated. It is assumed that the black and white edges are adjusted to infinity. The defocus amount Δ corresponding to the reference length S can be calculated by using the difference d and the reference length S. For example, the defocus amount Δ is calculated as a value (Δ = d / S) obtained by dividing the difference d by the reference length S. The same applies to the defocus amount Δ'.
Then, the distance between the camera lens 12a and the image sensor 12b can be adjusted based on the defocus amount Δ or Δ'.

Although the embodiments of the present invention have been described above with reference to the examples, each embodiment shows a preferable example, and other structures or configurations having the same effects and characteristics are within the scope of the present invention. is there. The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the gist of the present invention.

For example, in the camera module adjusting device according to the embodiment of the present invention, the patterns (reticle) 11c and 11c'are the opening H _Near , the opening H _Just , and the opening H _Far , or the openings 11c-A to 11c. Although an example in which −E is provided has been given, the pattern (reticle) may have a transmissive portion formed at a portion corresponding to the opening by forming a light-shielding pattern on the transparent base material.

Further, regarding the shapes of the opening H _Near , the opening H _Just , and the opening H _Far , or the openings 11c-A to 11c-E, a circle or a rectangle is given as an example, but the defocus state in the camera module 12 is given. It does not have to be a circle or a rectangle as long as it can be evaluated or the amount of defocus can be measured. For example, a regular polygon or a shape obtained by combining a circle and a regular polygon may be adopted. It does not limit the area, size, or number.

Further, the light source unit 11a in the camera module adjusting device 10 according to the first embodiment of the present invention may be a device capable of generating an optical pattern by the pattern (lectil) 11c and forming an image of the optical pattern on the image sensor. For example, an LED (Light Emitting Mode), an incandescent lamp, or a fluorescent lamp can be mentioned, and any light source can be used as long as a substantially uniform surface light source can be formed by combining with the diffuser plate 11b. good.

Further, in the camera module adjusting device 10 according to the first embodiment of the present invention, the defocus amount Δ may be calculated based on the diameter D _Near , the diameter D _Just , and the diameter D _Far , or the defocus amount Δ may be calculated. It is possible to evaluate only the magnitude relation of the diameter D _Near , the diameter D _Just , and the diameter D _Far without going through the calculation of. For example, in the diameter D _Near , the diameter D _Just , and the diameter D _Far , the diameter D _Just is equal to or less than the first threshold value and the difference between the diameter D _Near and the diameter D _Far is equal to or less than the second threshold value. However, if it is possible to determine the state of being in focus, another method may be adopted.

Further, in the camera module adjusting device 20 according to the second embodiment, the defocus amount Δ is calculated by using the optical parameters (specifications) of the optical components of the camera module adjusting device and the arrangement and distance between the optical components. As an example, it was obtained by conducting an experiment or an actual measurement on the relationship between each ratio of the diameter D _Near , the diameter D _Just , and the diameter D _Far and the defocus amount Δ based on the image data output by the image sensor 12b. The Z stage may be driven by calculating the control command value corresponding to the defocus amount Δ by referring to the lookup table that stores the corresponding data.

In the camera module adjusting device 20 according to the second embodiment, it was shown that the defocus amount Δ corresponding to the reference length S is the difference d divided by the reference length S, but it is a constant of the target camera. Let α be a coefficient that can be calculated from the lens f _{L of} the light source, the interval P of the reticle pattern, the rotation angle ψ, etc., and use the offset amount β based on the jaspin edge position when the object is at infinity, for example, The defocus amount Δ corresponding to the reference length S may be obtained by using a mathematical formula such as.

10,100 Camera module adjusting device 11,101 Collimating light source 11a, 101a Light source 11b, 101b Diffusing plate 11c, 11c', 101c pattern (rectil)
11d, 101d Collimator lenses 12, 102, camera modules 12a, 102a Camera lenses 12b, 102b Image sensor 13, 103 Image processing unit 14, 104 Control unit 15, 105 Z stage

Claims (10)

A camera module adjusting device having a collimating light source unit, a camera module, an image processing unit, a control unit, and a Z-axis drive unit.
The collimator light source unit includes a light source, a pattern that converts the emitted light of the light source into a first light pattern, and a collimator lens that converts the first light pattern incident from the pattern into parallel light rays.
The vertical axis of the pattern is tilted by a predetermined angle with respect to the optical axis of the collimating light source unit or the camera module.
The camera module is an image pickup in which a camera lens that focuses the parallel light rays at a focusing position existing on the optical axis and a second light pattern in which the parallel light rays are formed are formed by the camera lens. With elements,
The image processing unit analyzes the image data of the second optical pattern output from the image sensor, measures the defocus amount of the second optical pattern, and measures the sign of the defocus amount.
The control unit determines the moving direction of the image sensor based on the defocus amount and the reference numeral, calculates the moving amount of the image sensor, and calculates the moving amount of the image sensor.
The camera module adjustment is characterized in that the Z-axis drive unit can shorten the adjustment time until the focusing position substantially coincides with the light receiving surface of the image pickup device based on the movement direction and the movement amount. apparatus. The Z-axis drive unit includes an image sensor holding unit that holds or loads the image sensor.
The camera module adjusting device according to claim 1, wherein the image sensor is moved in the optical axis direction based on the moving direction and the moving amount. The pattern has at least 3 or more openings
The camera module adjusting device according to claim 1 or 2, wherein the center of one of the openings and the focal point of the collimator lens are arranged so as to substantially coincide with each other. The camera module adjusting device according to any one of claims 1 to 3, wherein the opening is a pinhole having a substantially circular shape. When the focusing position substantially coincides with the light receiving surface, a first opening, a second opening, and a third opening that are different from the opening are set.
The first in-focus point in which the first light beam transmitted through the first opening is focused is located on the side of the camera lens as viewed from the image sensor.
The second in-focus point where the second light beam transmitted through the second opening is focused is located on the light-receiving surface of the image sensor.
The camera module adjustment according to claim 3 or 4, wherein the third focal point in which the third light ray transmitted through the third opening is focused is located on the opposite side of the camera lens when viewed from the image sensor. apparatus. A camera module adjustment method having a collimating light source unit, a camera module, an image processing unit, a control unit, and a Z-axis drive unit.
The collimator light source unit converts the emitted light of the light source into a first light pattern by a light source and a pattern, and converts the first light pattern incident from the pattern into a parallel light ray by a collimator lens.
The vertical axis of the pattern is tilted by a predetermined angle with respect to the optical axis of the collimating light source unit or the camera module.
In the camera module, the parallel light beam is focused on the in-focus position existing on the optical axis by the camera lens, and the second light pattern in which the parallel light ray is formed by the camera lens is formed by the image pickup element. Formed,
The image processing unit analyzes the image data of the second optical pattern output from the image sensor, measures the defocus amount of the second optical pattern, and measures the sign of the defocus amount.
The control unit determines the moving direction of the image sensor based on the defocus amount and the reference numeral, calculates the moving amount of the image sensor, and calculates the moving amount of the image sensor.
The camera module adjustment is characterized in that the Z-axis drive unit can shorten the adjustment time until the focusing position substantially coincides with the light receiving surface of the image sensor based on the moving direction and the moving amount. Method. In the Z-axis drive unit, the image sensor is held or loaded by the image sensor holding unit.
The camera module adjusting method according to claim 6, wherein the image sensor is moved in the optical axis direction based on the moving direction and the moving amount. The pattern has at least three or more openings and has
The camera module adjusting method according to claim 6 or 7, wherein the center of one of the openings and the focal point of the collimator lens are arranged so as to substantially coincide with each other. The camera module adjusting method according to any one of claims 6 to 8, wherein the opening is a pinhole having a substantially circular shape. When the focusing position substantially coincides with the light receiving surface, a first opening, a second opening, and a third opening that are different from the opening are set.
The first in-focus point in which the first light beam transmitted through the first opening is focused is located on the side of the camera lens as viewed from the image sensor.
The second in-focus point where the second light beam transmitted through the second opening is focused is located on the light-receiving surface of the image sensor.
The camera module adjustment according to claim 8 or 9, wherein the third focal point in which the third light ray transmitted through the third opening is focused is located on the opposite side of the camera lens when viewed from the image sensor. Method.