TW201331570A - Surface-scanning unit and optical detecting appratus having the same - Google Patents

Abstract

An optical detecting apparatus is used for surface-scanning and deriving an image of a testing matter. The optical detecting apparatus includes a surface-scanning unit and an image-catch unit. The surface-scanning unit has a plurality of emitting modules. The emitting modules are respectively used for emitting a plurality of lights with different angles, and the lights are overlapped to form a surface-scanning section on the testing matter. The image-catch unit has a camera module. The camera module is used for receiving the lights reflected from a portion of the testing matter corresponding to the surface-scanning section. Thus, the instant disclosure provides the optical detecting apparatus, which can be used for reducing the effect generated form the surface of the testing matter.

Description

Face scanning unit and optical detecting device with surface scanning unit

The present invention relates to a scanning unit and an optical detecting device, and more particularly to a surface scanning unit and an optical detecting device having a surface scanning unit.

Please refer to FIG. 1 , which is a schematic diagram of a conventional linear scan detecting device. The linear scan detecting device 1a is used for linear scanning and captures information of a printed circuit board 2a. The linear scan detecting device 1a includes two linear light sources 11a and an image capturing module 12a.

The position of the two linear light sources 11a is symmetric with respect to the printed circuit board 2a and is used to generate linear light, and the light emitted by the two linear light sources 11a forms a focus line on the surface of the printed circuit board 2a. The image capturing module 12a is configured to receive the light reflected by the focusing line.

In order to enable the light emitted by the two linear light sources 11a to form a focus line on the printed circuit board 2a, it is often necessary to change the projection angle of the two linear light sources 11a. However, if a shutdown is required to adjust the angle of the linear light source 11a in order to adapt to different conditions, it will inevitably consume a large amount of cost.

Furthermore, the focus line is easily affected by the unevenness (roughness) of the surface of the printed circuit board 2a and affects the image taking quality. For example, the more vertical the projection angle of the linear light source 11a is, the more susceptible it is to the surface roughness of the printed circuit board 2a, thus causing poor images of light and dark interlacing. However, the more horizontal the projection angle of the linear light source 11a is, the more difficult it is to cause reflection due to the concave portion of the surface of the printed circuit board 2a.

The reason is that the present inventors have felt that the above-mentioned defects can be improved, and the present invention has been put forward with great interest and research, and finally proposes a present invention which is reasonable in design and effective in improving the above-mentioned defects.

The embodiment of the invention provides a surface scanning unit and an optical detecting device with a surface scanning unit, which are less susceptible to the flatness of the surface of the object to be tested, thereby obtaining a better image.

An embodiment of the present invention provides an optical detecting device with a surface scanning unit for surface scanning and capturing an image of a test object. The optical detecting device with a surface scanning unit includes: a one-side scanning unit, including a light source module for emitting a light beam, wherein the surface light rays emitted by the light source modules are respectively irradiated to the object to be tested at different projection angles, and the surface light emitted by the light source modules is to be tested. The surface of the object is overlapped to form a scanning block of a shape; and an image capturing unit includes a camera module for receiving light reflected by a surface of the object to be tested corresponding to the surface scanning block.

Preferably, each of the light source modules includes at least one light generator and at least one light guide member for guiding the formation of the planar light. The at least one light guide member of each light source module is respectively disposed on the at least one light. The light path of the generator.

Preferably, the surface scanning unit includes an angle positioning module, and the angle positioning module is formed with a through hole for the light reflected by the surface of the object to be tested corresponding to the surface scanning block to pass through. The light source modules are respectively disposed on opposite sides of the perforation of the angle positioning module.

Preferably, the light source modules are symmetrically symmetrical with respect to the perforations of the angular positioning module.

Preferably, the surface scanning unit includes an angular positioning module for the light reflected by the surface of the object to be tested corresponding to the surface scanning block, and the light source modules are disposed at the angle. Positioning module.

Preferably, the angle positioning module is formed on a plurality of positioning slopes, and the positioning slopes are respectively located on opposite sides of the angle positioning module, and the light source modules are respectively disposed on the positioning slopes.

Preferably, the camera module includes a magnification adjustment lens and a signal receiver for converting an optical signal into an electrical signal, and the light reflected by the surface of the object corresponding to the surface scanning block passes through the signal receiving device. The magnification adjustment lens is transmitted to the signal receiver.

In summary, the optical detecting device provided by the embodiment of the present invention scans the object to be tested by scanning the surface scanning block to reduce the influence of the surface flatness of the object to be tested.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

[First Embodiment]

FIG. 2 is a perspective view of the first embodiment of the present invention, wherein FIG. 2 and FIG. 4A to FIG. 5 are schematic perspective views of the present embodiment, and FIGS. 3A and 3B are schematic plan views of the embodiment.

Referring to FIG. 2 and FIG. 3A, the embodiment is an optical detecting device with a surface scanning unit for surface scanning and capturing an image of the object to be tested 4, and the object to be tested 4 is implemented in the present embodiment. In the example, the printed circuit board 4 is taken as an example, but is not limited thereto. Furthermore, in the practical application, the optical detecting device can be mounted on a slide rail (not shown), and the object to be tested can be mounted on a movable platform (not shown).

The optical detecting device includes a one-side scanning unit 1, an image capturing unit 2, and a fixing unit 3.

The surface scanning unit 1 includes a plurality of light source modules 11 and an angle positioning module 12 . The light source module 11 is configured to emit a light beam 13 , and the light source module 11 is disposed on the angle positioning module 12 , so that the surface light rays 13 emitted by the light source modules 11 are respectively at different projection angles. The printed circuit board 4 is irradiated, and a one-side scanning block 14 is formed on the surface of the printed circuit board 4.

Thereby, when the surface of the printed circuit board 4 and the above-mentioned planar scanning block 14 are moved relative to each other, and the portion to be detected on the surface of the printed circuit board 4 is scanned by the surface scanning block 14, the scanning operation can be completed. The above-mentioned relative movements relative to each other may be the case where the position of the face-shaped scanning block 14 is unchanged and the positional movement of the printed circuit board 4 (e.g., the movement of the stage carrying the printed circuit board 4), the printing The position of the circuit board 4 is unchanged and the positional movement of the planar scanning block 14 (e.g., movement of the optical detecting means) or the planar scanning block 14 is moved together with the position of the printed circuit board 4.

In more detail, as shown in FIG. 4A and FIG. 4B, each light source module 11 includes a light generator 111 and a light guide 112 for guiding the surface light 13 to be formed, and each light source module 11 The light guides 112 are respectively disposed on the light emission path of the light generator 111.

In the present embodiment, the number of the light generators 111 and the light guides 112 included in each of the light source modules 11 is taken as an example, but in actual applications, the number of the light generators 111 and the light guides 112 is also It can be a majority, and the number of the two does not need to be the same (as shown in Figure 5).

In addition, the light generator 111 and the light guide 112 are respectively exemplified by the LED strip 111 and the light guide cup structure 112, and the light guide cup structure 112 is located in the light The light strip of the polar light strip 111 is on the light path. However, in the actual application, the light generator 111 and the light guide 112 are not limited to the above, that is, the light generator 111 may also be other components having a light-emitting function, and the light guide 112 may be other guides. A component of light function.

The LED strip 111 has a substrate 1111 and a plurality of LEDs 1112. The substrate 1111 has a first board surface 1113 and a second board surface 1114. The LEDs 1112 are spaced apart from each other. It is disposed on the first plate surface 1113 of the substrate 1111.

The light guide cup group structure 112 is formed with an extension plate 1121, a plurality of light guide cups 1122, and a plurality of fixing columns 1123. The light guide cup 1122 and the fixing column 1123 are formed to extend from the surface of the extension plate 1121 toward the same side. And the number of light guide cups 1122 corresponds to the number of light emitting diodes 1112. The light guide cup 1122 has a substantially truncated cone shape, and the radial cross-sectional area of the light guide cup 1122 gradually decreases from the extension plate 1121 toward the direction in which the light guide cup 1122 extends. In other words, the radial cross-sectional area of the light guide cup 1122 gradually increases from the adjacent light-emitting diodes 1112 toward the direction away from the light-emitting diodes 1112.

Furthermore, the fixing posts 1123 of the light guiding cup group structure 112 are respectively fixed to the first plate surface 1113 of the substrate 1111 of the light emitting diode strip 111, and the light guiding cups 1122 of the light guiding cup group structure 112 are respectively abutted. The light-emitting diode 1112 of the light-emitting diode strip 111 is mounted on the light-emitting diode 1112.

Thereby, the light emitted by the LEDs 1112 of the LED strip 111 can be guided through the light guide cup 1122 of the light guide cup structure 112 to form the above-mentioned planar light rays 13.

In addition, in the present embodiment, the number of the LEDs 1112 disposed on the LED strip 111 is exemplified by a plurality of LEDs 1112. However, in practical applications, the number of LEDs 1112 may also be one. The number of light guide cups 1122 of the light cup set structure 112 varies accordingly.

The angle positioning module 12 includes a base 121 and two blocks 122. The base 121 defines a substantially elliptical hole 1211 at a central portion thereof for the surface of the printed circuit board 4 to correspond to a surface shape. The light reflected by the portion of the scanning block 14 passes (as shown in Fig. 3A). Furthermore, the pedestals 121 are obliquely extended in a direction away from each other on opposite sides of the through hole 1211 to form two positioning slopes 1212, and the two positioning slopes 1212 are symmetric with respect to the through holes 1211.

The two blocks 122 are respectively fixed on the outer sides of the two positioning inclined surfaces 1212 of the base 121, and each of the blocks 122 is formed with a positioning inclined surface 1221. The positioning inclined surfaces 1221 of the two blocks 122 are respectively adjacent to the perforations 1211 from the block 122. One end is formed to extend obliquely away from the susceptor 121 and away from each other. The positioning slopes 1221 of the two blocks 122 are also symmetric with the through holes 1211. The angle between the positioning slope 1221 of the block 122 and the horizontal plane is greater than the angle between the positioning slope 1212 of the base 121 and the horizontal plane.

Moreover, each of the blocks 122 is formed with a plurality of heat dissipation fins 1222 at one end away from the through holes 1211. The heat dissipation fins 1222 are arranged in parallel with each other, and the heat dissipation fins 1222 are oriented substantially perpendicular to the long axis direction of the through holes 1211. Thereby, the heat dissipation effect of the light-emitting diode strip 111 is enhanced by the arrangement of the heat dissipation fins 1222.

The light source modules 11 are respectively disposed on the positioning slopes 1212 and 1221 on both sides of the through hole 1211 of the angle positioning module 12, that is, the light generators 111 and the light guides 112 are respectively symmetric with respect to the angle positioning module 12 Perforation 1211.

In addition, in the embodiment, the positioning bevels 1212, 1221 and the light source module 11 are both symmetrical to the perforations 1211. However, in actual applications, the positioning bevels 1212, 1221 or the light source module 11 may also be asymmetric. In the form of perforation 1211.

As shown in FIG. 2 and FIG. 3A , the image capturing unit 2 includes a camera module 21 for receiving light reflected from a surface of the printed circuit board 4 corresponding to the surface scanning block 14 . The camera module 21 includes a magnification adjustment lens 211 and a signal receiver 212 disposed at the end of the magnification adjustment lens 211. The signal receiver 212 is configured to convert the optical signal into an electrical signal, that is, the light reflected by the surface of the printed circuit board 4 corresponding to the portion of the planar scanning block 14 is transmitted to the signal receiver 212 via the magnification adjustment lens 211. Thereafter, signal receiver 212 can convert it to an electrical signal.

The fixing unit 3 includes two horizontal plates 31 and two vertical plates 32. The two horizontal plates 31 respectively have a receiving hole 311 at a central portion thereof, and the receiving hole 311 substantially corresponds to the outer diameter of the magnification adjusting lens 211.

Furthermore, the fixing unit 3 can position the relative relationship between the face-shaped scanning unit 1 and the image capturing unit 2, and the positioning manner of the fixing unit 3 is as follows. The magnification adjustment lens 211 is disposed in the receiving hole 311 of the horizontal plate 31, and the horizontal plate 31 is substantially parallel to the base 121 of the planar scanning unit 1. The two vertical plates 32 are respectively fixed on opposite side edges of the two horizontal plates 31 and the base 121. The manner in which the vertical plate 32 is fixed to the horizontal plate 31 and the base 121 may be a screw lock, but is not limited thereto, such as: Riveting or welding can also be used.

In summary, when the optical detecting device scans the printed circuit board 4, it scans with the surface scanning block 14 without having to consider whether or not there is accurate focusing to form a focused line for scanning. Therefore, the optical detecting device of the present embodiment is less susceptible to the flatness of the surface of the printed circuit board 4, and thus a better image is easily obtained.

That is, as shown in FIG. 3B, since the surface light rays 13 emitted by the light source modules 11 can overlap at a certain height, if the surface of the printed circuit board 4 is located within the specific height, the above-mentioned The surface scan block 14 is scanned. In other words, FIG. 3A shows a preferred distance between the optical detecting device and the surface of the printed circuit board 4, but in actual application, even if the surface of the printed circuit board 4 is rough, as long as it is located in the overlapping range of the above-mentioned planar light rays 13. Therefore, the optical detecting device of the present embodiment can form the planar scanning block 14 on the rough surface of the printed circuit board 4, thereby achieving effective scanning.

[Second embodiment]

Please refer to FIG. 6 , which is a second embodiment of the present invention. The present embodiment is similar to the first embodiment, and the same is not repeated in the same place, and the difference between the two is mainly in the angle positioning module 12 .

In more detail, the base 121 of the angular positioning module 12 of the present embodiment is equivalent to the base 121 of the first embodiment integrally extending to form the block 122 structure. In other words, the susceptor 121 of the present embodiment is simultaneously formed with two positioning slopes 1212, 1221.

In addition, the main spirit of the embodiment is that the positioning slopes 1212 and 1221 for determining the light projection angle of the LED strips 111 are not limited to the manner of formation described in the first embodiment. That is, as long as the technical feature of the condition that the angle between the positioning slope 1221 and the horizontal plane is larger than the angle between the positioning slope 1212 and the horizontal plane is the technical feature to be disclosed in the embodiment.

[Effect of the embodiment]

According to the embodiment of the invention, the optical detecting device is guided by the light guiding cup group structure 112, so that the light emitted by the LED strip 111 is surface-shaped, and further formed into a surface scanning block 14. Thereby, the optical detecting device is less susceptible to the flatness of the surface when scanning the printed circuit board 4, thereby obtaining a better image.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

[知知]

1a. . . Linear scanning detection device

11a. . . Linear light source

12a. . . Image capture module

2a. . . A printed circuit board

[this invention]

1. . . Face scanning unit

11. . . Light source module

111. . . Light generator (light emitting diode strip)

1111. . . Substrate

1112. . . Light-emitting diode

1113. . . First board

1114. . . Second board

112. . . Light guide (light guide cup structure)

1121. . . Extension board

1122. . . Light guide cup

1123. . . Fixed column

12. . . Angle positioning module

121. . . Pedestal

1211. . . perforation

1212. . . Positioning bevel

122. . . Block

1221. . . Positioning bevel

1222. . . Heat sink fin

13. . . Surface light

14. . . Face scan block

2. . . Image capture unit

twenty one. . . Camera module

211. . . Magnification adjustment lens

212. . . Signal receiver

3. . . Fixed unit

31. . . The horizontal plate

311. . . Socket hole

32. . . Riser

4. . . DUT (printed circuit board)

1 is a schematic view of a conventional linear scan detecting device;

2 is a perspective assembled view of an optical detecting device with a surface scanning unit according to the present invention;

3A is a schematic view showing the state of use of the optical detecting device with a surface scanning unit according to the present invention;

3B is a schematic view showing a surface light overlapping range of the optical detecting device with a surface scanning unit according to the present invention;

4A is a perspective view of a three-dimensional combination of a surface scanning unit of the present invention;

4B is a perspective exploded view of the surface scanning unit of the present invention;

FIG. 5 is a schematic perspective view of another embodiment of a surface scanning unit of the present invention; and

Figure 6 is a perspective view of a second embodiment of the present invention.

1. . . Face scanning unit

11. . . Light source module

111. . . Light generator (light emitting diode strip)

1111. . . Substrate

1112. . . Light-emitting diode

112. . . Light guide (light guide cup structure)

1122. . . Light guide cup

12. . . Angle positioning module

121. . . Pedestal

1211. . . perforation

1212. . . Positioning bevel

122. . . Block

1221. . . Positioning bevel

13. . . Surface light

14. . . Face scan block

4. . . DUT (printed circuit board)

Claims (10)

An optical detecting device with a surface scanning unit for surface scanning and capturing an image of a test object, the optical detecting device with a surface scanning unit comprising: a one-side scanning unit, comprising a plurality of separately for emitting a light source module with a light-emitting surface, wherein the surface light rays emitted by the light source modules are respectively irradiated to the object to be tested at different projection angles, and the surface light emitted by the light source modules is overlapped on the surface of the object to be tested. a one-side scanning block; and an image capturing unit, comprising a camera module for receiving light reflected by a surface of the object to be tested corresponding to the surface scanning block. The optical detecting device with a surface scanning unit according to claim 1, wherein each light source module comprises at least one light generator and at least one light guiding member for guiding the formation of the planar light, each The at least one light guiding member of a light source module is respectively disposed on the light emitting path of the at least one light generator. The optical detecting device with a surface scanning unit according to the first aspect of the invention, wherein the surface scanning unit comprises an angular positioning module, the angular positioning module is formed with a perforation for the The light reflected by the surface of the object corresponding to the surface of the scanning block is passed through, and the light source modules are respectively disposed on opposite sides of the perforation of the angular positioning module. The optical detecting device with a surface scanning unit according to the third aspect of the invention, wherein the light source modules are symmetrically symmetrical with respect to the perforation of the angular positioning module. The optical detecting device with a surface scanning unit according to the first aspect of the invention, wherein the surface scanning unit comprises a portion for reflecting the surface of the object to be tested corresponding to the surface scanning block. An angle positioning module through which light passes, and the light source modules are disposed on the angle positioning module. The optical detecting device with a surface scanning unit according to the fifth aspect of the invention, wherein the angle positioning module forms a plurality of positioning slopes, wherein the positioning slopes are respectively located at two sides of the angle positioning module, and the The light source modules are respectively disposed on the positioning slopes. The optical detecting device with a surface scanning unit according to the first aspect of the invention, wherein the camera module comprises a magnification adjusting lens and a signal receiver for converting an optical signal into an electrical signal, the to be tested The light reflected by the surface of the object corresponding to the portion of the planar scanning block is transmitted to the signal receiver via the magnification adjustment lens. A surface scanning unit for scanning an image of a test object, wherein the surface scanning unit comprises a plurality of light source modules respectively for emitting a side light, and the surface light emitted by the light source modules is respectively projected differently An angle is applied to the object to be tested, and the surface light emitted by the light source modules overlaps the surface of the object to be tested to form a scanning block. The surface scanning unit of claim 8, wherein each of the light source modules comprises at least one light generator and at least one light guiding member for guiding the forming of the planar light, each of the light source modules The at least one light guiding member is disposed on the light emitting path of the at least one light generator. The surface scanning unit of claim 8, wherein the surface scanning unit comprises an angular positioning module, the angle positioning module is formed with a through hole for the surface of the object to be tested to correspond to the surface The light source modules are disposed on the two sides of the perforation of the angle positioning module, and the light source modules are symmetrically opposite to the perforations of the angle positioning module.