KR20210047071A - Camera Module Inspection Chart and System Including same - Google Patents

Abstract

According to an embodiment, a camera module inspection chart comprises: a chart including a first inspection pattern for inspecting a first camera function, a first polarizing member positioned on the first inspection pattern, a second inspection pattern for inspecting a second camera function, and a second polarizing member located on an upper portion of the second inspection pattern and having a polarization angle different from that of the first polarizing member; and a polarizing plate including a first polarizing plate having the same polarization angle as that of the first polarizing member and a second polarizing plate having the same polarization angle as that of the second polarizing member.

Description

Camera Module Inspection Chart and System Including same}

The present invention relates to a camera module inspection chart and a system including the same, and more particularly, is a technology related to a camera module inspection chart and system capable of simultaneously inspecting camera modules of various specifications with high inspection accuracy. .

Portable terminals such as smart phones, mobile phones, PDAs, etc., which are widely used in recent years, are actively developing convergence in which additional functions such as watching movies and taking pictures are added as well as the original functions of the terminals. As one of the leading ones, CAMERA MODULE is the most representative.

The camera module is made by arranging a printed circuit board, an image sensor, a driving unit, and a lens inside a housing, and the image sensor is manufactured using an image sensor such as a CCD or CMOS as a main component. Here, the camera module collects an image of an object through an image sensor and is stored as data on a memory in the device, and the stored data is converted into an image and displayed through a display unit of a corresponding portable terminal.

And in recent years, as the technology advances, not only the resolution is gradually increased to high pixels, but various additional functions such as auto focusing (AF) and optical zoom are additionally implemented. To check whether these functions work correctly. It is also becoming important.

In general, when manufacturing a camera module, after assembling the components of the camera module, an inspection is performed for the defectiveness of the camera module, and the focus or resolution inspection of the camera module is performed by using an inspection chart on which an image having a specific pattern such as a figure is drawn. It proceeds while filming.

When inspecting a camera module using an inspection chart, inspection is generally performed while the inspection chart is fixed in front of the camera module.Because the function is different for each camera module, the inspection chart used for inspection must also be manufactured according to the camera module. There is a difficulty to do.

In other words. As shown in Fig. 1, if a camera module a was tested using a chart including a pattern to perform a function test, the camera module has a different angle of view and the area to be tested is different. In order to perform the function test, the test had to be performed using a chart containing a pattern and a different pattern b.

Therefore, when one or more of the chart shape, pattern position, and magnification is required by the camera module to be inspected, the existing chart cannot be used and a new chart has to be produced and used, which increases time and cost. Existed.

Accordingly, a camera module inspection chart and a system including the same according to an embodiment are an invention designed to compensate for the above-described problems, and a camera module inspection capable of simultaneously performing a functional inspection on a plurality of camera modules using a plurality of polarizing plates. It is to provide a chart and a camera module inspection system including the chart.

A camera module inspection chart according to an embodiment includes a first inspection pattern for inspecting a first camera function, a first polarizing member positioned above the first inspection pattern, and a second inspection pattern for inspecting a second camera function. And a second polarizing member positioned above the second inspection pattern and having a polarization angle different from that of the first polarizing member; and a first polarizing plate and the second polarizing plate having the same polarization angle as the first polarizing member. A polarizing plate including a second polarizing plate having the same polarization angle as that of the polarizing member may be included.

A polarization angle of the first polarization member and a polarization angle of the second polarization member may be perpendicular to each other.

The polarization angle of the first polarizing member may be 0 degrees (horizontal), and the polarization angle of the second polarizing member may be 90 degrees (vertical).

The polarization angle of the first polarizing plate may be 0 degrees (horizontal), and the polarization degree of the second polarizing plate may be 90 degrees (vertical).

The polarizing plate may further include a motor for selectively overlapping the first polarizing plate and the second polarizing plate on the front surface of the chart.

The first polarizing plate is connected to one side of the motor, the second polarizing plate is connected to the other side of the motor, and according to the rotation of the motor, the first polarizing plate and the second polarizing plate are selectively connected to the front of the chart. It can be overlapped.

The chart further includes a third inspection pattern for inspecting a third camera function and a third polarizing member positioned above the third inspection pattern and having a polarization angle different from that of the first and second polarizing members. Can include.

The polarizing plate may include a third polarizing plate having the same polarization angle as the third polarizing member.

The first camera function test and the second camera function test may include at least one of a resolution test and a Modulation Transfer Function (MTF) test.

The first test pattern may include a pattern for performing a function test on the first camera module, and the second test pattern may include a pattern for performing a function test on the second camera module.

A camera module inspection system according to another embodiment includes a first inspection pattern for inspecting a first function, a first polarizing member positioned above the first inspection pattern, and a second inspection pattern for inspecting a function of a second camera module. And a second polarizing member positioned above the second inspection pattern and having a polarization angle different from that of the first polarizing member, a first polarizing plate having the same polarization angle as the first polarizing member, and the second polarizing light. Functional tests of the first and second camera modules are performed based on images of a polarizing plate including a second polarizing plate having the same polarization angle as a member, and the first and second inspection patterns that have passed through the polarizing plate. It may include a control unit to perform.

A polarization angle of the first polarization member and a polarization angle of the second polarization member may be perpendicular to each other.

The polarization angle of the first polarizing member may be 0 degrees (horizontal), and the polarization angle of the second polarizing member may be 90 degrees (vertical).

The polarizing plate may further include a motor that selectively overlaps the first polarizing plate and the second polarizing plate on the front of the chart or on the front of the camera module performing function inspection.

The first polarizing plate is connected to one side of the motor, the second polarizing plate is connected to the other side of the motor, and the control unit controls the motor to selectively function the first and second polarizing plates. It is possible to overlap the front of the camera module to be inspected or the front of the chart.

When performing a function check on the first camera module, the control unit overlaps the first polarizing plate on the front of the first camera module or the front of the chart, and performs a function check on the second camera module , The second polarizing plate may be overlapped on the front side of the second camera module or the front side of the chart.

The camera module function test may include at least one of a resolution test and a Modulation Transfer Function (MTF) test.

The camera module inspection chart and the system including the same according to an embodiment can perform functional inspection on several items using a single chart including several inspection items, thereby saving cost due to chart integration. There is an advantage of being able to measure more than one model at the same time.

1 is a diagram illustrating a method of inspecting a camera module according to a conventional embodiment.
2 is a block diagram showing some components of a camera module inspection system according to an embodiment of the present invention.
3 is a diagram illustrating a side of a chart according to an exemplary embodiment.
4 is a diagram illustrating a method of acquiring an image for a first inspection pattern arranged on a chart according to an exemplary embodiment.
5 is a diagram illustrating a method of acquiring an image for a second turn arranged on a chart according to an exemplary embodiment.
6 is a diagram illustrating a method of overlapping a first polarization plate and a second polarization in front of a camera module according to another embodiment.
7 is a diagram illustrating a method of overlapping a first polarization plate and a second polarization in front of a camera module according to another embodiment.

The embodiments described in the present specification and the configurations shown in the drawings are preferred examples of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, terms used in the present specification are used to describe embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present specification, terms such as "comprise", "include" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification. Or the presence or addition of other features or numbers, steps, actions, components, parts, or combinations thereof, or a combination thereof, and includes ordinal numbers such as "first" and "second" used herein. The terms described above may be used to describe various components, but the components are not limited by the terms.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. In the drawings, parts not related to the description are omitted in order to clearly describe the present invention.

2 is a block diagram showing some components of the camera module inspection system 100 according to an embodiment of the present invention, and FIG. 3 is a view showing a side of a chart according to an embodiment. 4 is a diagram illustrating a method of acquiring an image for a first inspection pattern arranged on a chara chart according to an exemplary embodiment, and FIG. 5 is a diagram illustrating a second turn arranged on a chara chart according to an exemplary embodiment. It is a diagram showing a method of acquiring an image.

Referring to FIG. 2, a camera module inspection chart 110 according to an embodiment includes a chart 110 including a specific pattern for examining the function of the camera module, and a second polarizing plate 140 having different polarization angles. And a motor 120 for controlling the rotational operation of the second polarizing plate 140 and the second polarizing plate 140 and the second polarizing plate 140, and the camera module inspection system 100 may include a camera module inspection A control unit 350 that controls the chart 110 and the first camera module 210 and the second camera module 220 and performs a function test of the camera module based on the images captured by the camera modules 210 and 220, a control unit The communication unit 330 that transmits the command of 350 to the first camera module 210 and the second camera module 220, the first camera module 210, the second camera module 220, and the second polarizing plate 140 ), the storage unit 340 for storing information on the second polarizing plate 140 and the image captured by the first camera module 210 and the second camera module 220 or the result of the analysis by the control unit 350 to an external device. It may include a display unit 360 and the like indicated by.

The chart 110 may include a specific pattern for examining various functions of the camera module. For example, it may include a pattern having a specific shape necessary for adjusting the resolution or focus of the lens, and for example, it may be made of a PIMA chart specified in ISO12233.

Therefore, since the chart has a specific pattern tailored to it to check the camera function, in general, only one function or one camera type in one chart has to be inspected. In other words, to perform an inspection on item a, only the chart containing the pattern a can be used. To perform the inspection on item b, only use the chart containing the pattern b.

However, in the chart 110 according to an embodiment, as shown in FIG. 3, a pattern a that can perform an inspection for item a and a pattern b that can perform an inspection for item b are on the surface of the chart 110 as shown in FIG. 3. Since the pattern is included together, there is an advantage of being able to perform tests on items a and b at the same time. Find out in detail through the drawings below. However, for convenience of explanation, pattern a is referred to as a first test pattern and pattern b is referred to as a second test pattern.

Although not shown in the drawing of FIG. 3, a first polarizing member capable of passing only a specific direction of light may be included in the upper portion of the first pattern of FIG. 3, and a first polarizing member capable of passing only a specific direction of light may be included in the upper portion of the second pattern. Two polarizing members may be included. Accordingly, only light from which light in a specific direction has been removed among the components of the light remains as the light that has passed through the first or second polarization member.

In addition, the polarization angles of the first polarization member and the second polarization member may be different from each other, and may be specifically arranged to form a perpendicular angle.

For example, when the polarization angle of the first polarizing member is 0 degrees (horizontal), the polarization angle of the second polarizing member may be 90 degrees (vertical), and conversely, the polarization angle of the first polarizing member is 90 degrees (vertical). ), the polarization angle of the second polarization member may be 0 degrees (horizontal).

And when the second polarizing plate 140 or the second polarizing plate 140 is overlapped as shown in FIG. 4 or 5 in front of the chart 110 or in front of the camera module to be inspected, the image acquired by the camera module Can acquire only an image for a specific pattern that has passed only a specific wavelength.

That is, since the polarizing plate passes only light in a specific direction, an image can be acquired when the polarizing member on the chart 110 and the polarization angle of the polarizing plate are the same, but the polarizing member and the polarizing plate on the chart 110 When the angle and the polarization angle of the polarizing plate are different, specifically, if there is a difference of 90 degrees, both the light in the horizontal direction and the light in the vertical direction are blocked, so that the light transmitted from the camera module does not reach the chart 110 and thus is reflected. No image can be acquired because there is no light.

For example, in the case of FIG. 4, the second polarizing plate 140 is overlapped with the front of the inspection chart 110 or the front of the camera module. In FIG. 4, the first polarizing member, the polarizing angle, and the second polarizing plate 140 Since the polarization angle of is the same, the light emitted from the camera module may pass through both the second polarizing plate 140 and the first polarizing member, and then reflected by the first inspection pattern to return to the camera module.

However, since the second polarizing plate 140 does not have the same polarization angle as the second polarizing member, light emitted from the camera module passes through the second polarizing plate 140 and the second polarizing member positioned on the chart 110. There is no light component left. Accordingly, light transmitted from the camera module and passed through the second polarizing plate 140 and the second polarizing member is reflected and does not return to the camera module again.

Therefore, as shown in (c) of FIG. 4, since the image acquired by the camera module can acquire the image for the chart remaining only in the pattern a, the controller 350 checks or removes the item a based on this. 1 Can perform inspection on the camera module.

On the contrary, FIG. 5 corresponds to a case where the second polarizing plate 140 is overlapped with the front of the inspection chart 110 or the front of the camera module. In FIG. 5, the polarization angle of the second polarizing plate 140 is the polarization angle of the second polarizing member and the polarization angle. Since is the same, light emitted from the camera module may pass through both the second polarizing plate 130 and the second polarizing member, and then reflected on the second inspection pattern and return to the camera module.

However, since the second polarizing plate 140 does not have the same polarization angle as the first polarizing member, light emitted from the camera module passes through the second polarizing plate 140 and the first polarizing member positioned on the chart 110. There is no light component left. Accordingly, the light transmitted from the camera module and passed through the second polarizing plate 140 and the first polarizing member is reflected and does not return to the camera module again.

Therefore, as shown in (c) of FIG. 5, since the image acquired by the camera module can acquire the image for the chart remaining only in the b pattern, the controller 350 checks or removes the b item based on this. 1 Can perform inspection on the camera module.

That is, in order to test a specific function of the camera module, only one pattern must exist on the chart, and according to the prior art, it is not possible to include multiple patterns for multiple items in a single chart.

However, in the case of the camera module inspection chart 110 according to an embodiment, although the chart 110 includes inspection patterns for several inspection items at the same time, the image acquired by the camera module using a polarizing plate includes only one specific pattern. Since you can acquire an image of the chart you are doing, you can perform an inspection.

Therefore, by using this principle, it is possible to include multiple patterns for multiple items in a single chart, thereby saving the cost due to chart integration, and also having the advantage of being able to measure two or more types of models at the same time.

6 is a diagram illustrating a method of overlapping a first polarizing plate and a second polarizing plate in front of a camera module according to another exemplary embodiment, and FIG. 7 is a plan view illustrating the arrangement according to FIG. 6.

6 and 7, the camera module inspection system 300 according to an embodiment arranges a motor including a second polarizing plate 140 and a second polarizing plate 140 in front of the camera module to be inspected. Optionally, the second polarizing plate 140 or the second polarizing plate 140 may be overlapped on the front side of the camera module.

That is, when the first inspection pattern is required to perform the inspection on the first item, the second polarizing plate 140 is placed in front of the camera module 200 by rotating the connection part 121 using the motor 120. I can.

In this case, the light transmitted from the camera module 200 passes through the second polarizing plate 140 and only the components in the vertical or horizontal direction remain. Since the polarization angle of one polarizing member is the same, light transmitted from the camera module 200 may reach the first inspection pattern.

Accordingly, the camera module 200 may capture an image for the first inspection pattern. However, in the case of the second inspection pattern, since the polarization angle of the second polarizing member positioned above the second inspection pattern is perpendicular to the polarization angle of the second polarizing plate 140, the light transmitted from the camera module 200 is The light cannot reach the second inspection pattern since both are blocked while passing through the polarizing plate 140 and the second polarizing member. Therefore, the camera module 200 cannot acquire an image for the second inspection pattern.

Conversely, if a second inspection pattern is required to perform the inspection on the second item, the second polarizing plate 140 is placed in front of the camera module 200 by rotating the connection part 121 using the motor 120. I can.

In this case, the light transmitted from the camera module 200 passes through the second polarizing plate 140 and only the components in the vertical or horizontal direction remain. Since the polarization angle of the two polarizing members is the same, the light transmitted from the camera module 200 may reach the second inspection pattern. Accordingly, the camera module 200 may capture an image for the second inspection pattern.

However, in the case of the first inspection pattern, since the polarization angle of the first polarizing member positioned above the first inspection pattern is perpendicular to the polarization angle of the second polarizing plate 140, the light transmitted from the camera module 200 is The light cannot reach the first inspection pattern since both are blocked while passing through the polarizing plate 140 and the first polarizing member. Therefore, the camera module 200 cannot acquire an image for the first inspection pattern.

That is, through this method, an image for the first inspection pattern or the second inspection pattern can be selectively acquired, and there is an effect of selectively examining other items using one chart.

In Figures 6 and 7, the inspection items for the first inspection pattern and the inspection items for the second inspection pattern have been described based on one camera module, but as shown in FIG. As an inspection for the camera module 210, the inspection for the second inspection pattern may be set as an inspection for the second camera module 220.

That is, the first inspection pattern and the second inspection pattern may be patterns for different functional tests for one camera or for functional tests for different camera modules for one item.

Returning to FIG. 1 and describing other components of the camera module inspection system 300, the chart 110 and the camera modules 210 and 220 may be stored in the storage unit 340. The storage unit 340 may store information on the initial position of the lens from the MTF value detected by the control unit 350.

Accordingly, the storage unit 340 is a nonvolatile memory device such as a cache, read only memory (ROM), programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), and flash memory. Alternatively, it may be implemented as at least one of a volatile memory device such as a random access memory (RAM), a hard disk drive (HDD), or a storage medium such as a CD-ROM, but is not limited thereto.

In addition, the storage unit 340 may be a memory implemented as a separate chip from the processor described later in relation to the control unit 350 to be described later, or may be implemented as a processor and a single chip.

The controller 350 may play a role of controlling the overall functions of the camera modules 210 and 220 and the camera module inspection system 300.

Specifically, the control unit 350 may analyze image data of the chart 110 acquired by the camera modules 210 and 220 to perform inspection on various functions of the camera modules 210 and 220.

For example, the controller 350 may analyze image data acquired by the camera modules 210 and 220 to detect a resolution for each lens position. Based on this, the controller 350 may find an optimal lens position of each of the camera modules 210 and 220 based on the detected resolution.

In addition, the control unit 350 may transmit a signal to the motor 120 using the communication unit 330 to selectively place the second polarizing plate 140 and the second polarizing plate 140 in front of the camera module according to the purpose of the inspection. .

For example, when the first camera module 210 needs to be inspected, the second polarizing plate so that the first camera module 210 can photograph the first inspection pattern for inspecting the function of the first camera module 210. It is possible to control 140 to be disposed in front of the first camera module 210, and on the contrary, when the second camera module 220 needs to be inspected, the function of the second camera module 220 is tested. The second polarizing plate 140 may be controlled to be disposed on the front side of the second camera module 220 so that the second camera module 220 can photograph the second inspection pattern for the second inspection pattern.

The display unit 360 may display image data of the chart 110 generated by the camera modules 210 and 220.

The display unit 360 may display image data of the chart 110 generated for each lens position and provide information to the user so that the information on the chart 110 can be visually identified. Accordingly, the display unit may include various display devices.

The communication unit 330 may serve to transmit and receive signals between the control unit 350 and the camera modules 210 and 222 and the motor 120.

Until now, features and effects of a camera module chart and a camera module inspection system including the same according to an embodiment have been examined through the drawings.

In the case of inspecting a camera module using an inspection chart according to the prior art, inspection is generally performed while the inspection chart is fixed in front of the camera module.Because the function is different for each camera module, the inspection chart used for inspection is also a camera module. There is a difficulty in making it according to.

In other words, if a chart with a different one or more of the shape of the chart, the position of the pattern, and the magnification of the chart is required by the camera module to be inspected, the existing chart cannot be used and a new chart has to be created and used, which increases time and cost. There was a problem.

However, the camera module inspection chart and the system including the same according to an embodiment can perform functional inspection on several items using a single chart including several inspection items, thereby saving cost due to chart integration. And there is an advantage of being able to measure more than one model at the same time.

Although the embodiments have been described with reference to limited embodiments and drawings, various modifications and variations can be made from the above description to those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as systems, structures, devices, circuits, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved. Therefore, other embodiments and claims and equivalents fall within the scope of the claims to be described later.

100: camera module inspection chart
110: chart
120: motor
130: first polarizing plate
140: second polarizing plate
200: camera module inspection system
210: first camera module
220: second camera module
230: Ministry of Communications
240: storage
250: control unit
260: display

Claims (15)

A first inspection pattern for inspecting a first camera function;
A first polarizing member positioned above the first inspection pattern;
A second inspection pattern for inspecting a second camera function; And
A second polarizing member positioned above the second inspection pattern and having a polarization angle different from that of the first polarizing member; And
A camera module inspection chart comprising a polarizing plate including a first polarizing plate having the same polarization angle as the first polarizing member and a second polarizing plate having the same polarization angle as the second polarizing member. The method of claim 1,
A camera module inspection chart wherein a polarization angle of the first polarization member and a polarization angle of the second polarization member are perpendicular to each other. The method of claim 2,
The first polarizing member has a polarization angle of 0 degrees (horizontal), and the second polarizing member has a polarization angle of 90 degrees (vertical). The method of claim 1,
The first polarizing plate has a polarization angle of 0 degrees (horizontal) and the second polarizing plate has a polarization degree of 90 degrees (vertical). The method of claim 1,
The polarizing plate,
A camera module inspection chart further comprising a; motor for selectively overlapping the first polarizing plate and the second polarizing plate on the front surface of the chart. The method of claim 5,
The first polarizing plate is connected to one side of the motor, the second polarizing plate is connected to the other side of the motor, and according to the rotation of the motor, the first polarizing plate and the second polarizing plate are selectively connected to the front of the chart. Overlapped camera module inspection chart. The method of claim 1,
The above chart is:
And a third inspection pattern for inspecting a third camera function, and a third polarization member positioned above the third inspection pattern and having a polarization angle different from that of the first and second polarization members, and
The polarizing plate,
Camera module inspection chart comprising a third polarizing plate having the same polarization angle as the third polarizing member. The method of claim 1,
The first camera function test and the second camera function test,
A camera module inspection chart including at least one of a resolution inspection and a Modulation Transfer Function (MTF) inspection. The method of claim 1,
The first test pattern includes a pattern for performing a function test on a first camera module, and the second test pattern includes a pattern for performing a function test on a second camera module. A first test pattern for checking a function of the first camera module;
A first polarizing member positioned above the first inspection pattern;
A second test pattern for checking the function of the second camera module; And
A second polarizing member positioned above the second inspection pattern and having a polarization angle different from that of the first polarizing member;
A polarizing plate including a first polarizing plate having the same polarization angle as the first polarizing member and a second polarizing plate having the same polarization angle as the second polarizing member; And
A camera module inspection system comprising: a control unit for performing functional inspection of the first camera module and the second camera module based on images of the first inspection pattern and the second inspection pattern passing through the polarizing plate. The method of claim 10,
A camera module inspection system in which a polarization angle of the first polarization member and a polarization angle of the second polarization member are perpendicular to each other. The method of claim 11,
The polarization angle of the first polarizing member is 0 degrees (horizontal), and the polarization angle of the second polarizing member is 90 degrees (vertical). The method of claim 10,
The polarizing plate,
A camera module inspection system further comprising: a motor for selectively overlapping the first polarizing plate and the second polarizing plate on the front of the chart or on the front of the camera module for functional inspection. The method of claim 13,
The first polarizing plate is connected to one side of the motor, the second polarizing plate is connected to the other side of the motor,
The controller is a camera module inspection system for controlling the motor to overlap the front of the camera module or the front of the chart for selectively performing functional inspection of the first and second polarizing plates. The method of claim 14,
The control unit,
When performing a function test on the first camera module, overlap the first polarizing plate on the front of the first camera module or the front of the chart,
When performing a function test on the second camera module, a camera module inspection system for overlapping the second polarizing plate with the front of the second camera module or the front of the chart.

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