KR20180020527A - Camera module for chip mounting apparatus - Google Patents

Abstract

According to an embodiment of the present invention, a camera module for a chip mounting apparatus includes a first optical module and a second optical module arranged close to each other. The first optical module includes: a first camera; a first beam splitter arranged on a line extended from an optical axis of the first camera; a first lighting part which is arranged in a direction different from the first camera around the first beam splitter to irradiate light on the first beam splitter; and a first polarizer which is arranged between the first beam splitter and the first lighting part. The second optical module includes: a second camera; a second beam splitter arranged on a line extended from an optical axis of the second camera; a second lighting part which is arranged in a direction different from the second camera around the second beam splitter to irradiate light on the second beam splitter; and a second polarizer which is arranged between the second beam splitter and the second lighting part. The axial direction of the first polarizer and the axial direction of the second polarizer are different.

Description

[0001] The present invention relates to a camera module for a camera module,

The present invention relates to a camera module of a component body.

The component mounting machine is a device for mounting components such as an IC chip on an electronic circuit board. In general, a component mounting machine recognizes the shape of a component to detect an abnormality or calculates the position information of the component And a camera module for performing photographing.

The camera module of the component part may include a plurality of optical modules arranged in a line, and through this configuration, a large number of parts can be simultaneously recognized at the same time. However, when the light emitted from the illumination included in one optical module is inadvertently incident on the adjacent optical module, light is not uniformly irradiated on the component, thereby causing a problem that the accuracy of the component recognition is reduced.

Korean Patent Publication No. 2011-0020431 (Mar. 3, 2011)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and it is an object of the present invention to provide an optical module in which the light emitted by the illumination included in one optical module is not incident on a camera included in an adjacent optical module, And it is an object of the present invention to provide a camera module which can precisely measure components.

However, these problems are illustrative and do not limit the scope of the present invention.

According to an embodiment of the present invention, there is provided an optical module comprising a first optical module and a second optical module disposed adjacent to each other, the first optical module being disposed on a line extending from an optical axis of the first camera, A first illumination unit disposed in a direction different from the first camera with respect to the first beam splitter and configured to irradiate light to the first beam splitter, and a second illumination unit disposed between the first beam splitter and the first illumination unit Wherein the second optical module includes a second camera, a second beam splitter disposed on a line extending an optical axis of the second camera, a second beam splitter disposed on the second beam splitter, And a second polarizer disposed between the second beam splitter and the second illumination unit, the second polarizer being disposed in a direction different from the camera and irradiating the second beam splitter with light, and a second polarizer disposed on the polarization axis of the first polarizer Direction and the second polarizer Direction of the polarization axis provides a different, component mounting machine the camera module.

The direction of the polarization axis of the first polarizer and the direction of the polarization axis of the second polarizer may be perpendicular to each other.

The first polarizer and the second polarizer may be disposed on a line extending from the optical axis of the first camera and the second camera, respectively.

A third polarizer disposed between the first camera and the first beam splitter, and a fourth polarizer disposed between the second camera and the second beam splitter; And the directions of the polarization axes of the first polarizer and the second polarizer may be the same as the directions of the polarization axes of the third polarizer and the fourth polarizer, respectively.

Further comprising a plurality of optical modules arranged in a line along the direction of the second optical module from the first optical module and each including at least one polarizer, The direction of the polarization axis of each of the polarizers included in the optical modules is the same as the direction of the polarization axis of the first polarizer included in the first optical module and the polarization axes of the polarizers included respectively in the plurality of even- May be the same as the direction of the polarization axis of the second polarizer included in the second optical module.

Other aspects, features, and advantages other than those described above will be apparent from the following detailed description, claims, and drawings.

According to an embodiment of the present invention as described above, by configuring each of the plurality of optical modules to include a polarizer, the light emitted by the illumination included in one optical module reaches the camera included in the adjacent optical module It is possible to provide a camera module of a component body capable of precisely measuring the shape and position of a component.

Of course, the scope of the present invention is not limited by these effects.

1 is a block diagram showing a camera module of a component body according to an embodiment of the present invention.
2A and 2B are block diagrams showing a first optical module and a second optical module included in the camera module of FIG. 1, respectively.
FIG. 3 is a conceptual diagram showing a principle in which a first optical module included in the camera module of FIG. 1 photographs a first part.
4A and 4B are diagrams showing a first optical module and a second optical module included in a camera module of component mounting according to another embodiment of the present invention, respectively.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or corresponding components throughout the drawings, and a duplicate description thereof will be omitted .

In the following embodiments, the terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The terms used in the following examples are used only to illustrate specific embodiments and are not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the following description, the terms "comprises" or "having ", and the like, specify that the presence of stated features, integers, steps, operations, elements, But do not preclude the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

In the drawings, components may be exaggerated or reduced in size for convenience of explanation. For example, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of explanation, and thus the present invention is not necessarily limited to those shown in the drawings.

FIG. 1 is a configuration diagram showing a camera module of a component body according to an embodiment of the present invention. FIGS. 2A and 2B are views showing a first optical module and a second optical module included in the camera module of FIG. FIG. 3 is a conceptual diagram showing the principle of the first optical module included in the camera module of FIG. 1 photographing the first component.

1 to 3, a camera module of a component body according to an embodiment includes a first optical module 100 and a second optical module 200 disposed adjacent to each other, The first camera 110 includes a first camera 110, a first beam splitter 120 disposed on a line extending an optical axis OA of the first camera 110, a first beam splitter 120 disposed on a line extending from an optical axis OA of the first camera 110, A first illumination unit 130 disposed in a direction different from the camera 110 to irradiate light to the first beam splitter 120 and a second illumination unit 130 disposed between the first beam splitter 120 and the first illumination unit 130, And a polarizer 140. The second optical module 200 includes a second camera 210, a second beam splitter 220 disposed on a line extending an optical axis OA of the second camera 210, A second illumination unit 230 disposed in a direction different from that of the second camera 210 with respect to the second beam splitter 220 and configured to irradiate the second beam splitter 220 with light and a second beam splitter 220, And a second polarizer 24 disposed between the second illumination units 230 0), and the direction of the polarization axis of the first polarizer 140 and the direction of the polarization axis of the second polarizer 240 are different from each other.

The first optical module 100 and the second optical module 200 are arranged to face the first component P1 and the second component P2 respectively and the first component P1 and the second component P2, May be disposed on the stage S so as to be spaced apart from each other. A plurality of components P1, P2, P3 and P4 are arranged on the stage S and parts P1, P2, P3 and P4 are arranged on the stage S by a plurality of optical modules 100, 200, 300 and 400 Respectively. Although the first part P1 and the second part P2 are shown as one in Fig. 1, the present invention is not limited thereto, and the first part P1 and the second part P2 may represent a plurality of parts have. That is, one optical module can photograph only one component or a plurality of components.

The first part P1 and the second part P2 may be two parts arranged adjacent to each other among the plurality of parts. According to one embodiment, the stage S may be a movable stage moving in one direction, and the plurality of components may be supported by a method such as suction by a nozzle (not shown) disposed on the stage S, respectively .

The first camera 110 and the second camera 210 can recognize the shape and position of the parts P1 and P2 by photographing the first part P1 and the second part P2 respectively. It is possible to determine whether the parts P1 and P2 are defective based on the information of the parts P1 and P2 photographed by the cameras 110 and 210. In the case of normal parts, have.

Referring to FIG. 2A, the first optical module 100 includes a first camera 110, a first beam splitter 120, a first illumination unit 130, and a first polarizer 140. The first camera 110 includes a first optical system 111 and a first image sensor 112 constituted by at least one lens and the light reflected from the first component P1 passes through the first optical system 111 And can be imaged on the image sensor 112. The electric signal obtained through the photoelectric conversion of the image sensor 112 can be subjected to a predetermined process through the first signal processing unit 113 and an image of the first part P1 can be obtained therefrom.

The first optical system 111 and the first image sensor 112 may be disposed along the optical axis OA and the first beam splitter 120 may be disposed on a line extending from the optical axis OA of the first camera 110, Can be disposed. The first beam splitter 120 is an optical member that reflects a part of the incident light and transmits a part of the light. The first beam splitter 120 may be in the form of a sheet or a cube. According to one embodiment, the first beam splitter 120 may be in the form of a sheet, which is inexpensive compared to the cube shape.

The first illumination unit 130 is disposed in a direction different from the direction in which the first camera 110 is disposed with the first beam splitter 120 as a center. The first illumination unit 130 irradiates the first beam splitter 120 with light . ≪ / RTI > The first illumination unit 130 functions to irradiate the first component P1 with light so that the first component P1 can be clearly photographed. The first beam splitter 120 can reflect the light incident from the first illumination unit 130 and the reflected light can travel toward the first part P1 along the optical axis OA of the first camera 110 have. Here, the optical axis OA does not refer to only one line, but may mean a wide meaning having a certain tolerance in consideration of deformation and misalignment of the optical elements.

A first polarizer 140 may be disposed between the first beam splitter 120 and the first illumination unit 130. A polarizer is an optical element that transmits only light of a component that coincides with the polarization axis of a polarizer among incident light. Light that has passed through the polarizer becomes polarized light in a polarization axis direction.

The first polarizer 140 has a first polarization axis and the light transmitted through the first polarizer 140 and then polarized in the first polarization axis direction is reflected by the first beam splitter 120 and is reflected along the optical axis OA You can proceed. A first mirror 150 may be disposed on the optical axis OA to reflect the light reflected by the first beam splitter 120 and irradiate the first component P1.

According to one embodiment, the first polarizer 140 is disposed on an extended line of the optical axis OA of the first camera 110 and the light reflected from the first component P1 is incident on the first mirror 150 And then transmitted through the first polarizer 140 and the first beam splitter 120 to be incident on the first camera 110. At this time, only the component in the direction of the first polarization axis among the light incident on the first polarizer 140 can transmit the first polarizer 140. As described above, the light emitted from the first illumination unit 130 passes through the first polarizer 140 and is polarized in the first polarization axis direction. As a result, the light emitted from the first illumination unit 130, The reflected light can retransmit the first polarizer 140. However, the light without component in the direction of the first polarization axis can not transmit through the first polarizer 140, and as a result, it can not be incident on the first camera 110. This will be described later.

The first polarizer 140 may be in the form of a sheet, and may be arranged to be separated from the first beam splitter 120. However, the present invention is not limited to this, and the first polarizer 140 may be formed integrally with the first beam splitter 120, but in this case, the manufacturing cost may increase.

Referring to FIG. 2B, the second optical module 200 photographs the second part P2 and all other configurations except for the first optical module 100 and the polarizer are the same. That is, the second optical module 200 includes a second optical system 211 composed of at least one lens, a second camera 210 including a second image sensor 212 and a second signal processing unit 213, A beam splitter 220, a second illumination unit 230, and a second polarizer 240.

The second illumination unit 230 may irradiate light to the second beam splitter 220 and the second polarizer 240 may be disposed between the second illumination unit 230 and the second beam splitter 220. The second polarizer 240 has a second polarization axis and the light transmitted through the second polarizer 240 and then polarized in the direction of the second polarization axis is reflected by the second beam splitter 220 and travels along the optical axis OA You can proceed. A second mirror 250 that reflects the light reflected by the second beam splitter 220 and irradiates the second component P2 may be disposed on the optical axis OA.

The direction of the second polarization axis of the second polarizer 240 is different from the direction of the first polarization axis of the first polarizer 140, and they may be substantially perpendicular to each other.

1 and 3, a plurality of lights included in the first illumination unit 130 and the second illumination unit 230 may be arranged in a row along one direction (x axis) The plurality of arranged components can also be arranged in a line along one direction (x-axis). The first illuminating unit 130 and the second illuminating unit 230 irradiate the first and second parts P1 and P2 with light so that the first camera 110 and the second camera 210 respectively emit the first So that the component P1 and the second component P2 can be clearly photographed.

However, since the first optical module 100 and the second optical module 200 are disposed adjacent to each other, the light emitted from the second illumination unit 230 included in the second optical module 200 is unintentionally transmitted through the first optical May be incident on module 100. If the first optical module 100 does not include the first polarizer 140, at least some of the light incident on the first optical module 100 may eventually be incident on the first camera 110, The background light can be partially increased to reduce the recognition accuracy of the first part P1. In addition, some of the light incident on the first optical module 100 may be reflected by the first mirror 150 and irradiated onto the first component P1. In this case, The recognition accuracy of the first part P1 photographed by the first camera 110 can be further reduced.

The light emitted from the first illumination unit 130 included in the first optical module 100 may be incident on the second optical module 200 and the second optical module 200 may be incident on the second polarizer 240 The recognition accuracy of the second part P2 photographed by the second camera 210 can be reduced.

However, in the case of the present invention, the first optical module 100 and the second optical module 200 each include a first polarizer 140 and a second polarizer 240, each having a polarization axis substantially perpendicular to each other, The light emitted from the illumination part included in the adjacent optical module can be prevented from being incident on the camera or the amount of incident light can be reduced.

3, the light L1e emitted from the first illumination unit 130 is polarized in the first polarization axis direction while transmitting through the first polarizer 140, and the light L1p polarized in the first polarization axis direction 1 mirror 150 and then irradiated onto the first part P1. The light L1r reflected from the first part P1 is reflected again by the first mirror 150 and is incident on the first polarizer 140 again and transmitted through the first polarizer 140, 110, respectively. That is, the first part P1 can be photographed by the first camera 110. [

The light emitted from the second illumination unit 230 included in the second optical module 200 adjacent to the first optical module 100 is polarized in the direction of the second polarization axis while transmitting through the second polarizer 240, Polarized light L2p may be reflected by the second mirror 250 and then irradiated onto the second part P2. The light L2p polarized in the second polarization axis direction may be incident on the adjacent first optical module 100 in various directions before or after being reflected by the second mirror 250. However, The light L2p can not pass through the first polarizer 140, and thus is not incident on the first camera 110. [ That is, since the light emitted from the second illuminating unit 230 is blocked by the first polarizer 140, the problem that the recognition accuracy of the first part P1 photographed by the first camera 110 is reduced is prevented Or reduced.

Similarly, the light emitted from the first illumination unit 130 included in the first optical module 100 may be incident on the second optical module 200 adjacent to the first optical module 100, 200 are blocked by the second polarizer 240 and are not incident on the second camera 210. That is, the accuracy of recognition of the first part P1 photographed by the second camera 210 can be improved through such a configuration.

Although the first optical module 100 and the second optical module 200 adjacent to each other have been described above, according to the embodiment of the present invention, the camera module of the component real- P3, and P4, respectively, of the optical module 100, 200, 300, and 400, respectively. Although only four components P1, P2, P3, and P4 and four optical modules 100, 200, 300, and 400 are shown in FIG. 1, the present invention is not limited thereto. That is, a camera module of a component body may include a larger number of components and optical modules, and a component shown by one component may represent a plurality of components.

1, a first optical module 100, a second optical module 200, a third optical module 300, and a fourth optical module 400 are sequentially disposed along one direction x, The third optical module 300 and the fourth optical module may have exactly the same structure as the first optical module 100 and the second optical module 200, respectively. That is, the first polarizer 140 included in the first optical module 100 and the polarizer (not shown) included in the third optical module 300 have polarization axes in the same direction, The second polarizer 240 included in the fourth optical module 400 and the polarizer (not shown) included in the fourth optical module 400 may have polarization axes in the same direction.

For example, all of the odd-numbered optical modules along the one direction (x) include polarizers having the same polarization axis, and the even-numbered optical modules all have the polarization axes of the polarizers included in the odd- And a polarizer having a substantially vertical polarization axis. With this configuration, it is possible to prevent or reduce the problem of reducing the recognition accuracy of the components by allowing the light emitted from the illumination units included in each of the optical modules to be incident on the camera included in the adjacent optical module.

4A and 4B are diagrams showing a first optical module and a second optical module included in a camera module of component mounting according to another embodiment of the present invention, respectively.

FIGS. 4A and 4B show a modified example of FIGS. 2A and 2B, respectively. FIG. 4A and FIG. 4B show a modification of the camera module of the component body shown in FIG. The same can be applied to the module. Hereinafter, the first optical module 100 'and the second optical module 200' shown in FIGS. 4A and 4B, respectively, are referred to as a first optical module 100 and a second optical module 100 ' (200) will be mainly described.

Referring to FIG. 4A, the first optical module 100 'includes a first camera 110' including a first optical system 111 ', a first image sensor 112', and a first signal processing unit 113 ' A first beam splitter 120 'disposed on a line extending from the optical axis OA of the first camera 110', a first beam splitter 120 'disposed on a line extending from the first camera 110' A first illumination unit 130 'arranged in the direction of the first beam splitter 120' to irradiate light to the first beam splitter 120 'and a first polarizer (not shown) disposed between the first beam splitter 120' and the first illumination unit 130 ' 140 '. The first optical module 100 'according to an exemplary embodiment may further include a third polarizer 160' disposed between the first camera 110 'and the first beam splitter 120'. The third polarizer 160 'is disposed on a line extending from the optical axis OA of the first camera 110' and the direction of the polarization axis of the third polarizer 160 ' And may be substantially the same as the direction of the polarization axis.

The first polarizer 140 included in the first optical module 100 of FIG. 2A must be disposed on the line extending the optical axis OA of the first camera 110, The first polarizer 140 'included in the first illumination unit 130' does not need to be disposed on the line where the optical axis OA extends and the first camera 110 ' . That is, the first polarizer 140 'may be disposed outside the optical axis OA.

The light emitted from the first illumination unit 130 'may pass through the first polarizer 140' having the first polarization axis and then be reflected by the beam splitter 120 'and travel along the optical axis OA. A first mirror 150 'that reflects the light reflected by the first beam splitter 120' and irradiates the first component P1 may be disposed on the optical axis OA.

The light reflected by the first part P1 is reflected again by the first mirror 150 'and then transmitted through the first beam splitter 120' and reflected by the first camera 110 'and the first beam splitter 120' The third polarizer 160 'disposed between the third polarizer 160' and the third polarizer 160 '. Since the third polarizer 160 'has a polarization axis in the same direction as the first polarizer 140', the polarized light in the first polarization axis direction can be transmitted as it is. The light transmitted through the third polarizer 160 'is incident on the first camera 110'. That is, the first part P1 can be photographed by the first camera 110 '.

Referring to FIG. 4B, the second optical module 200 'photographs the second part P2 and all other configurations except for the first optical module 100' and the polarizer are the same. That is, the second optical module 200 'includes a second optical system 211' including at least one lens, a second camera 210 'including a second image sensor 212' and a second signal processing unit 213 ' ', A second beam splitter 220', a second illumination unit 230 ', and a second polarizer 240'.

The second illumination unit 230 'emits light to the second beam splitter 220' and the second polarizer 240 'is disposed between the second illumination unit 230' and the second beam splitter 220 ' . A fourth polarizer 260 'is disposed between the second beam splitter 220' and the second camera 210 'and a fourth polarizer 260' is disposed between the second camera 210 'and the optical axis OA of the second camera 210' Is disposed on the extended line and may have a polarization axis in the same direction as the polarization axis of the second polarizer 240 '. The second polarizer 240 'may be disposed as close as possible to the second illumination unit 230'. That is, the second polarizer 240 'may be disposed outside the optical axis OA.

A second mirror 250 'that reflects the light reflected by the second beam splitter 220' and irradiates the second component P2 on the line of the optical axis OA of the second camera 210 ' . The directions of the polarization axes of the second polarizer 240 'and the fourth polarizer 260' may be substantially perpendicular to the directions of the polarization axes of the first and third polarizers 140 'and 160'.

2A and 2B, when the first optical module 100 and the second optical module 200 include only one polarizer, the first polarizer 140 included in the first optical module 100 may be an adjacent optical Only the light polarized in the direction perpendicular to the polarization axis of the first polarizer 140 among the light emitted from the illumination unit included in the module can be blocked. However, when the light emitted from the second illumination unit 230 included in the second optical module 200 is incident on the first optical module 100 without passing through the second polarizer 240, the first polarizer 240 The light emitted from the second illuminating unit 230 may be incident on the first camera 110 and consequently the recognition accuracy of the first component P1 may be reduced.

However, as shown in FIGS. 4A and 4B, the first optical module 100 'is disposed in front of the first camera 110' in addition to the first polarizer 140 'disposed adjacent to the first illumination unit 130' The second optical module 200 'further includes a third polarizer 160', and the second optical module 200 'further includes a second polarizer 240' disposed adjacent to the second illumination portion 230 ' The light emitted from the second illumination unit 230 'is polarized in the polarization axis direction of the second polarizer 240' so that the first optical module 100 ' , And the third polarizer 160 'included in the first optical module 100' is arranged such that the light polarized in the polarization axis direction of the second polarizer 240 'is not incident on the first camera 110' Can be blocked.

4A and 4B, although the number of polarizers used in the case of constructing the first and second optical modules 100 'and 200' may increase, the light emitted from the illumination unit included in one optical module It is possible to more certainly prevent or reduce the problem of incidence on the adjacent optical module and reducing the recognition accuracy of the component.

The camera module of the component body according to the embodiments of the present invention constructed as described above can be configured such that each of the plurality of optical modules includes a polarizer so that the light emitted by the illumination included in one optical module is reflected by the adjacent optical It is possible to precisely measure the shape and position of the component so as not to reach the camera included in the module.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100, 100 ': first optical module 200, 200': second optical module
110, 110 ': first camera 210, 210': second camera
120, 120 ': first beam splitter 220, 220': second beam splitter
130, 130 ': first illumination unit 230, 230': second illumination unit
140, 140 ': first polarizer 240, 240': second polarizer
150, 150 ': first mirror 250, 250': second mirror
160 ': third polarizer 260': fourth polarizer

Claims (5)

A first optical module and a second optical module disposed adjacent to each other,
Wherein the first optical module comprises:
A first camera;
A first beam splitter disposed on an extended line of the optical axis of the first camera;
A first illumination unit arranged in a direction different from the first camera with respect to the first beam splitter, the first illumination unit irradiating light to the first beam splitter; And
And a first polarizer disposed between the first beam splitter and the first illumination unit,
Wherein the second optical module comprises:
A second camera;
A second beam splitter disposed on an extended line of the optical axis of the second camera;
A second illumination unit disposed in a direction different from the second camera with respect to the second beam splitter, the second illumination unit irradiating light to the second beam splitter; And
And a second polarizer disposed between the second beam splitter and the second illumination unit,
Wherein the direction of the polarization axis of the first polarizer is different from the direction of the polarization axis of the second polarizer. The method according to claim 1,
Wherein a direction of a polarization axis of the first polarizer and a direction of a polarization axis of the second polarizer are perpendicular to each other. The method according to claim 1,
Wherein the first polarizer and the second polarizer are disposed on a line extending from the optical axis of the first camera and the second camera, respectively. The method according to claim 1,
A third polarizer disposed between the first camera and the first beam splitter; And
And a fourth polarizer disposed between the second camera and the second beam splitter,
And the directions of the polarization axes of the first polarizer and the second polarizer are the same as the directions of the polarization axes of the third polarizer and the fourth polarizer, respectively. The method according to claim 1,
Further comprising a plurality of optical modules arranged in a row from the first optical module along the second optical module direction, each optical module including at least one polarizer,
The directions of the polarization axes of the polarizers included in the plurality of optical modules arranged at odd-numbered positions from the second optical module are the same as the directions of the polarization axes of the first polarizers included in the first optical module, Wherein the direction of the polarization axis of each of the polarizers included in the plurality of disposed optical modules is the same as the direction of the polarization axis of the second polarizer included in the second optical module.

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