KR102313177B1 - System and method to check the rotation angle of the prism included in the camera module - Google Patents

Abstract

The present invention relates to a system for inspecting a prism rotation angle of a camera module and a method for inspecting a prism rotation angle of a camera module using the same, which can measure a rotation angle in a two-axial direction of a prism included in a camera module assembly. The system for inspecting a prism rotation angle of a camera module, which inspects a rotation angle of a prism included in a camera module assembly, comprises: a mark plate block disposed in an upper region of a prism, and projecting, to the prism, an inspection mark for inspecting a rotation angle of the prism while irradiating light to the prism; and a mark check unit disposed on a path in which the light reflected from the prism moves, and checking the inspection mark reflected from the prism. The mark plate block includes: a housing in which a light moving unit is formed in the center thereof; a light source coupled to an upper portion of the housing; and a mark plate disposed at a lower portion of the light source, coupled to the housing, and formed with the inspection mark.

Description

A prism rotation angle inspection system of a camera module and a prism rotation angle inspection method of a camera module using the same {System and method to check the rotation angle of the prism included in the camera module}

The present invention relates to a prism rotation angle inspection system of a camera module and a method for inspecting a prism rotation angle of a camera module using the same, and more particularly, a camera module capable of measuring the rotation angle of a prism in a two-axis direction included in a camera module assembly of the prism rotation angle inspection system and to a prism rotation angle inspection method of a camera module using the same.

In portable terminals such as mobile phones and personal digital assistants (PDA), convergence in which additional functions such as watching movies and taking photos are added as well as the intrinsic functions of the terminal are actively progressing, leading to the development of such multi-convergence. As one of them, the camera module (CAMERA MODULE) can be said to be the most representative.

In the camera module, the resolution is gradually increased to a high pixel, and various additional functions such as autofocusing (AF) and optical zoom (OPTICAL ZOOM) are additionally implemented.

In general, a camera module (CCM: COMPACT CAMERA MOUDULE) mounted on a portable terminal is miniaturized and manufactured using an image sensor such as a charge coupled device (CCD) or CMOS as a main component. Here, the camera module collects an image of an object through an image sensor and stores it as data in a memory in the device, and the stored data is displayed as an image through a display unit of the corresponding portable terminal.

The camera module adjusts the distance between the lens and the image sensor and adjusts the focus by fixing the camera module. do.

As shown in FIG. 5 , the camera module assembly includes a prism, a fixed lens, a plurality of moving lenses, and an imaging module, and the plurality of moving lenses individually moves to adjust resolution, focus, and the like.

In the case of constituting the above-described lens group, the alignment relationship between the respective lenses is very important, and in particular, in the case of the prism, it must be positioned at an accurate angle together with the spacing.

However, in the case of a camera module assembly applied to a portable terminal or a miniature camera, since the size of the lens and the prism is very small, it is very difficult to position the prism at an accurate angle.

In order to solve this problem, the inclination angle of the prism was derived using the autocollimator method, and the angle at which the prism was arranged was corrected based on the derived inclination angle of the prism. As well as being narrow, there is a problem in that only a plane perpendicular to the light source for measurement can be measured.

In addition, in the case of the above-described conventional method, since the size of the measuring equipment is large, the occupied space is excessive, so it can be used for R&D, but there is a problem that it is unsuitable for commercial purposes.

Republic of Korea Patent Publication No. 10-0728353 (Title of the invention: method for measuring inclination angle using secondary reflection of a three-dimensional autocollimator, publication date: 2007.06.13)

The problem to be solved by the present invention relates to a prism rotation angle inspection system of a camera module capable of measuring the rotation angle of a prism in a two-axis direction included in a camera module assembly, and a prism rotation angle inspection method of a camera module using the same.

In order to solve the above problems, the present invention is a prism rotation angle inspection system of a camera module for inspecting the rotation angle of a prism included in a camera module assembly, disposed in an upper region of the prism, and irradiating light to the prism At the same time, a mark plate block for projecting an inspection mark for inspecting the rotation angle of the prism onto the prism, and a light reflected from the prism are disposed on a moving path, to check the inspection mark reflected from the prism Including a mark confirmation unit, the mark plate block includes a housing having a light moving part formed in the center, a light source coupled to the upper portion of the housing, and a mark plate disposed below the light source and coupled to the housing, the mark plate having the inspection mark formed thereon. It provides a prism rotation angle inspection system of the camera module, characterized in that it comprises.

Here, the mark plate is disposed under the light source and coupled to the housing, an inner mark plate having a plurality of dot marks formed thereon, and a plurality of inner mark plates disposed under the inner mark plate and coupled to the housing, and corresponding to the dot marks It may include an outer mark plate formed with a circle mark.

In addition, the dot mark is a central dot mark formed in the center of the inner mark plate, a plurality of first wide-angle dot marks arranged to confirm the first rotation angle of the prism, and the second rotation angle of the prism. It includes a plurality of second wide-angle point marks arranged so as to be able to check the center circular mark formed in the center of the outer mark plate so as to correspond to the center point mark, and the first rotation angle of the prism a first wide-angle circular mark corresponding to the first wide-angle dot mark, and a second wide-angle circular mark corresponding to the second wide-angle dot mark, arranged to confirm the second rotation angle of the prism; can do.

In addition, based on the position of the point mark and the circular mark confirmed by the mark confirmation unit, it may further include a rotation angle detection unit for detecting the rotation angle of the prism.

In addition, in the prism rotation angle inspection method of a camera module using the prism rotation angle inspection system of the camera module according to the present invention described above, the present invention irradiates light to the prism from the mark plate block to form the inspection mark on the prism A light irradiation step of projecting to the prism, a mark checking step of confirming the dot mark and the circular mark reflected from the prism, and the rotation of the prism based on the dot mark and the circular mark confirmed in the mark checking step It provides a prism rotation angle inspection method of a camera module including a rotation angle detection step of detecting the angle.

A prism rotation angle inspection system of a camera module and a prism rotation angle inspection method of a camera module using the same according to the present invention have the following effects.

First, since a relatively wide range of rotation angles can be measured with respect to the biaxial rotation of the prism included in the camera module assembly, the size of the entire system is miniaturized and economical efficiency is achieved.

Second, since the rotation angle of the prism can be measured through the mark plate block of the size corresponding to the prism included in the camera module assembly, the occupied space is minimized, so that it can be widely used commercially as well as for R&D.

1 is a diagram schematically showing the overall configuration of a prism rotation angle inspection system of a camera module according to the present invention.
2 is a diagram schematically showing the configuration of a mark plate block in the prism rotation angle inspection system of the camera module according to the present invention.
3 is a view for explaining the principle of measuring the prism rotation angle of the prism rotation angle inspection system of the camera module according to the present invention.
4 is a view showing an inner mark plate and an outer mark plate included in the mark plate block of the prism rotation angle inspection system of the camera module according to the present invention.
5 is a diagram schematically illustrating the configuration of a camera module assembly, which is an object to be inspected by the prism rotation angle inspection system of the camera module according to the present invention.
6 is a view illustrating an example of a path along which light travels for each rotation angle of a prism in the prism rotation angle inspection system of the camera module according to the present invention.
7 is a view showing the steps of the prism rotation angle inspection method of the camera module according to the present invention.

Hereinafter, preferred embodiments of the present invention in which the above-described problems to be solved can be specifically realized will be described with reference to the accompanying drawings. In describing the present embodiments, the same names and the same reference numerals are used for the same components, and an additional description thereof will be omitted below.

The prism rotation angle inspection system of the camera module according to the present invention will be described with reference to FIGS. 1 to 6 .

Prior to describing the prism rotation angle inspection system of the camera module according to the present invention, the configuration of the camera module assembly 10, which is the object to be inspected by the prism rotation angle inspection system of the camera module according to the present invention (see FIG. 5), will be described. As follows.

The camera module assembly 10 includes a prism 11 , a fixed lens 12 , a plurality of moving lenses 13 , and an imaging module 14 , and light moves in the order of the above-described configuration.

Here, the light reflected from the reflective surface of the prism 11 moves to the fixed lens 12 and the plurality of moving lenses 13, and at this time, the angle at which the prism 11 is disposed is based on the fixed position. When rotated to , the movement path of the light reflected from the reflective surface is changed.

That is, the prism rotation angle inspection system of the camera module according to the present invention inspects the optical path error generated according to the rotation angle of the prism 11 .

The prism rotation angle inspection system of the camera module according to the present invention includes a mark plate block 1000 , a mark confirmation unit 2000 , and a rotation angle detection unit 3000 .

The mark plate block 1000 is disposed in the upper region of the prism 11, and at the same time irradiating light to the prism 11, an inspection mark for inspecting the rotation angle of the prism 11 is applied to the prism 11 ) is projected on

Specifically, the mark plate block 1000 includes a housing 1100 , a light source 1200 , and a mark plate 1300 .

The housing 1100 is coupled to the light source 1200 and the mark plate 1300 to be described later, and serves to fix the positions of the light source 1200 and the mark plate 1300 .

In addition, a light moving part 1110 is formed in the center of the housing 1100 , and the light irradiated from the light source 1200 passes through the light moving part 1110 and is located in the lower part of the housing 1110 . moves to the prism 11 .

The light source 1200 is coupled to the upper portion of the housing 1100 , and the light source 1200 irradiates light in the direction of the prism 11 .

The mark plate 1300 is disposed under the light source 1200 , and an inspection mark serving as a reference for detecting the rotation angle of the prism 11 is formed on the mark plate 1300 .

Specifically, the mark plate 1300 includes an inner mark plate 1310 and an outer mark plate 1320 as shown in FIGS. 2 to 4 .

The inner mark plate 1310 is disposed under the light source 1200 , is coupled to the housing 1100 , and a plurality of dot marks are formed on the inner mark plate 1310 .

Here, the inner mark plate 1310 may be formed of a translucent material, and the dot mark may be formed of an opaque material, or the dot mark may be displayed in a specific color on the inner mark plate 1310, and the dot Only the area where the mark is formed may be formed of an opaque material.

Here, as the inner mark plate is formed of a translucent material, the inner mark plate attenuates the pattern of light generated by the LED constituting the light source 1200, and diffuses the light transmitted from the light source 1200 It acts as a diffusion plate.

Accordingly, as shown in FIG. 6 , as light moves through the inner mark plate 1310 , a shadow is formed on the image that can be confirmed by the mark confirmation unit 2000 , and a circular shape to be described later. The rotation angle of the prism can be confirmed from the shadow position of the dot mark formed on the mark.

Specifically, as shown in FIG. 4A , the dot mark includes a central dot mark 1311a, a first wide-angle dot mark 1311b, and a second wide-angle dot mark 1311c.

The center point mark 1311a is formed in the center of the inner mark plate 1310, and corresponds to the alignment criterion of the rotation angle of the prism 11.

The first wide-angle dot mark 1311b is composed of a plurality, and is disposed on both sides around the central dot mark 1311a, so that the first rotation angle of the prism 11 can be confirmed. For example, the first rotation angle means Φ which is an angle at which the prism 11 rotates with the Z axis as the rotation axis (see FIG. 3 ).

The second wide-angle dot mark 1311c is composed of a plurality, and is disposed at upper and lower portions with respect to the central dot mark 1311a, so that the second rotation angle of the prism 11 can be confirmed. For example, the second rotation angle means θ, which is an angle at which the prism rotates with the Y axis as the rotation axis (see FIG. 3 ).

In addition, the outer mark plate 1320 is disposed under the inner mark plate 1310 and coupled to the housing 1100, the outer mark plate 1320 has a plurality of circular marks corresponding to the dot marks. is formed

Here, the outer mark plate 1320 may be formed of an opaque material, and the area in which the circular mark is formed may be formed of a transparent material, or the circular mark may be formed of a hole formed in the outer mark plate 1320 .

Therefore, as shown in Figure 6, as the light moves through the outer mark plate 1320, the image that can be confirmed in the mark confirmation unit 2000 has an outer mark plate other than the area corresponding to the circular mark ( 1320), and the above-mentioned dot mark appears on the circular mark, so that the rotation angle of the prism can be confirmed according to the correlation between the dot mark and the circular mark, which will be described later.

The principle of measuring a wide angle according to the angle of the prism 40 will be described with reference to FIGS. 3, 4 and 6 .

According to the rotation angle of the prism 11, the center points 1311a and 1321a of the light sources M1 and M2 projected on the mark check unit 2000 (2D sensor) are moved.

Here, the light source M1 refers to light moving from the inner mark plate 1310 to the prism 11 , and the light source M2 refers to light moving from the outer mark plate 1320 to the prism 11 . do.

That is, as shown in FIG. 3, light moves from the inner mark plate 1310 and the outer mark plate 1320 that are spaced apart by a distance L in the optical axis direction, passes through the prism 11 reflective surface, and is a 2D sensor. The image of the dot mark and the circular mark is projected to the mark check unit 2000 .

6 , the rotation angle of the prism 11 is generated according to the driving of the prism 11 , and each light source projected to the 2D sensor according to the rotation angle of the prism 11 . The center points 1311a and 1321a of M1 and the light source M2 move.

At this time, the first rotation angle Φ and the second rotation angle θ are calculated by inverse calculation from the motion vectors of the center points of the two projected light sources, and the calculation formulas are as shown in Equation 1 below.

Here, the characters such as IM1x, IM1y, etc., which are surfaced, mean (IM1x, IM1y) indicating the component of IM1, which is a motion vector on the light source M1 in FIG. It means (IM2x, IM2y) indicating the components of the motion vector IM2.

Specifically, as shown in (b) of Figure 4, the center circular mark 1321a is formed in the center of the outer mark plate 1320, the prism 11 together with the center point mark 1311a It corresponds to the alignment standard of the rotation angle of

The first wide-angle circular mark 1321b is composed of a plurality, and is disposed on both sides around the central circular mark 1321a so as to correspond to the first wide-angle dot mark 1311b, and the prism 11 is Make it possible to check the first rotation angle.

The second wide-angle circular mark 1321c is composed of a plurality, and is disposed on the upper and lower parts with respect to the central circular mark 1321a to correspond to the second wide-angle dot mark 1311c, and the second of the prism 11 2 Check the rotation angle.

Here, as shown in (c) of FIG. 4, when viewed in a state in which the inner mark plate 1310 and the outer mark plate 1320 are overlapped, the center point is located in the center area of the center circular mark 1321a. A mark 1311a is disposed, and the first wide-angle circular mark 1321b and the first wide-angle dot mark 1311b, the second wide-angle circular mark 1321c and the second wide-angle circular mark 1311c are It is disposed at a position in consideration of the change in the path of light, which is changed according to the rotation angle of the prism 11 .

A method of confirming the second rotation angle will be described with reference to FIGS. 4 and 6 .

First, for convenience of explanation, a second wide-angle dot mark 1311c disposed below the central dot mark 1311a among the second wide-angle dot marks 1311c is defined as PM1, and the second wide-angle dot mark 1311c disposed under PM1 is defined as PM1. The 2 wide-angle dot mark 1311c is defined as PM2, and the second wide-angle circular mark 1321c disposed below the center circular mark 1321a among the second wide-angle circular marks 1321c is defined as CM1, and the The second wide-angle circular mark 1321c disposed under CM1 is defined as CM2.

As shown in (a) of FIG. 6, when the second rotation angle of the prism 11 is 0°, the center circular mark 1321a and the center point mark 1311a in the mark check unit 2000 ), and it can be seen that the center point mark 1311a is located at the center of the center circular mark 1321a in the projected image.

On the other hand, in FIG. 6(b), when the second rotation angle of the prism 11 is 3°, the center circular mark 1321a, the center point mark 1311a, in the mark confirmation unit 2000, PM1 and CM1 can be checked, and in the projected image, the center point mark 1311a is disposed in the upper area of the center circular mark 1321a, and it can be confirmed that the PM1 is disposed in the lower area of the CM1. .

In addition, in (c) of FIG. 6 , when the second rotation angle of the prism 11 is 6°, the PM1 and CM1 may be identified in the mark check unit 2000, and the PM1 in the projected image A state arranged at the center of the CM1 can be confirmed.

In addition, in (d) of FIG. 6 , when the second rotation angle of the prism 11 is 10°, the PM1, CM1, PM2 and CM2 can be checked in the mark check unit 2000, and the projected image It can be confirmed that the PM1 is disposed in the upper area of the CM1 and the PM2 is disposed in the lower area of the CM2.

Finally, in (e) of FIG. 6 , when the second rotation angle of the prism 11 is 15°, the PM2 and CM2 may be identified in the mark check unit 2000, and the PM2 in the projected image It can be seen that is arranged in the upper region of the CM2.

Since the method of confirming that the prism 11 is rotated in the direction of the first rotation angle can be confirmed in the same way as the method of confirming the second rotation angle of the prism 11 described above, the description thereof is omit

As described above, the mark confirmation unit 2000 is disposed on a path on which the light reflected from the prism 11 moves, and the mark confirmation unit according to the movement path of the light changed by the rotation angle of the prism 11 . In (2000), the different inspection marks can be identified.

Based on the type of the dot mark and the circular mark and the position of the dot mark disposed on the circular mark, the rotation angle detection unit 3000 is the prism 11 The rotation angle of the prism is detected, which determines how much the rotation angle is rotated by at least one of the first rotation angle and the second rotation angle.

An example of detecting the rotation angle of the prism will be briefly described with reference to FIGS. 6B to 6E .

As shown in (b) of Figure 6, the center point mark 1311a and the center circular mark 1321a are confirmed in the mark confirmation unit 2000, and the center point mark 1311a is the center circular mark 1321a ) in the upper region of the inner region.

At this time, the rotation angle detection unit 3000 is the prism 11 by the interval Δd1 of the center point mark 1311a confirmed in the mark confirmation unit 2000 from the center of the center circular mark 1321a the second Detects rotation in the direction of rotation angle.

In addition, as shown in (c) of Figure 6, the mark check unit 2000, the center point mark 1311a, the center circular mark 1321a, the PM1 and the CM1 are confirmed, the rotation angle detection unit 3000 ) is a second wide-angle dot mark 1311c and a second wide-angle circular mark 1321c where the PM1 and CM1 are respectively disposed below the central dot mark 1311a and the central circular mark 1321a. check that

At this time, the rotation angle detection unit 3000 is the prism ( 11) is rotated in the second rotation angle direction.

In addition, as shown in (d) of Figure 6, when the PM1, the CM1, the PM2 and the CM2 are confirmed in the mark confirmation unit 2000, the rotation angle detection unit 3000 is the rotation angle of the prism 11 When is 0°, it is detected that the prism 11 is rotated in the direction of the second rotation angle from PM1', which is the position of PM1, by Δd3, which is the interval between PM1 checked by the mark check unit 2000 .

In addition, as shown in (e) of Figure 6, when the PM2 and the CM2 are confirmed in the mark confirmation unit 2000, the rotation angle detection unit 3000 is the rotation angle of the prism 11 is 0 ° when the It is detected that the prism 11 is rotated in the direction of the second rotation angle by Δd4 which is the interval of PM2 checked by the mark check unit 2000 from PM2' which is the position of PM2.

As in the above example, the first rotation angle of the prism 11 based on the type of the dot mark and the circular mark identified by the mark confirmation unit 2000 and the position of the dot mark disposed on the circular mark. and a second rotation angle.

A method of inspecting a prism rotation angle of a camera module according to the present invention will be described with reference to FIGS. 1 to 7 .

The prism rotation angle inspection method of the camera module according to the present invention includes a light irradiation step (S100), a mark confirmation step (S200) and a rotation angle detection step (S300).

In the light irradiation step (S100), light is irradiated from the mark plate block 1000 to the prism 11 to project the inspection mark onto the prism 11 .

In the mark checking step (S200), the dot mark and the circular mark reflected from the prism 11 are checked.

In the rotation angle detection step (S300), the rotation angle of the prism 11 is detected based on the positions of the point mark and the circular mark confirmed in the mark checking step.

In addition, the detailed description of the prism rotation angle inspection method of the camera module according to the present invention corresponds to the above-described prism rotation angle inspection system of the camera module according to the present invention, and thus a description thereof will be omitted.

As described above, the present invention is not limited to the specific preferred embodiments described above, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. are possible and such modifications are within the scope of the present invention.

1000: mark plate block
1100: housing
1110: optical moving part
1200: light source
1300: mark plate
1310: inner mark plate
1311a: center point mark
1311b: first wide-angle dot mark
1311c: second wide-angle dot mark
1320: outer mark plate
1321: circular mark
1321a: center circular mark
1321b: first wide-angle circular mark
1321c: second wide-angle circular mark
2000: mark confirmation unit
3000: rotation angle detection unit

Claims (5)

In the prism rotation angle inspection system of the camera module for inspecting the rotation angle of the prism included in the camera module assembly,
a mark plate block disposed on the upper region of the prism and projecting an inspection mark to the prism for irradiating light to the prism and inspecting the rotation angle of the prism;
and a mark confirmation unit disposed on a path in which the light reflected from the prism moves, and confirming the inspection mark reflected from the prism; and
The mark plate block,
a housing in which a light moving part is formed in the center;
a light source coupled to the upper portion of the housing; and
and a mark plate disposed under the light source, coupled to the housing, and having the inspection mark formed thereon;
The mark plate is
an inner mark plate disposed under the light source, coupled to the housing, and having a plurality of dot marks;
The prism rotation angle inspection system of the camera module, comprising a; disposed under the inner mark plate, coupled to the housing, and an outer mark plate having a plurality of circular marks corresponding to the point marks. delete According to claim 1,
The dot mark is
a central point mark formed in the center of the inner mark plate;
a plurality of first wide-angle dot marks arranged to confirm a first rotation angle of the prism;
A plurality of second wide-angle point marks arranged to confirm the second rotation angle of the prism;
The circular mark is
a center circular mark formed in the center of the outer mark plate to correspond to the center point mark;
a first wide-angle circular mark disposed to confirm a first rotation angle of the prism and corresponding to the first wide-angle dot mark;
and a second wide-angle circular mark that is arranged to check the second rotation angle of the prism and corresponds to the second wide-angle dot mark. 4. The method of claim 3,
Based on the position of the point mark and the circular mark confirmed by the mark confirmation unit, the rotation angle detection unit for detecting the rotation angle of the prism; prism rotation angle inspection system of the camera module, characterized in that it further comprises. In the prism rotation angle inspection method of the camera module using the prism rotation angle inspection system of the camera module according to any one of claims 3 and 4,
a light irradiation step of projecting the inspection mark onto the prism by irradiating light from the mark plate block to the prism;
a mark checking step of confirming the dot mark and the circular mark reflected from the prism; and
A prism rotation angle inspection method of a camera module comprising a; a rotation angle detection step of detecting the rotation angle of the prism based on the point mark and the circular mark confirmed in the mark checking step.

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