TWI633316B - Printed circuit board inspection device - Google Patents

Abstract

The invention provides a printed circuit board inspection device, which includes a carrier and a rail mounted above the carrier; a moving base, the mobile base is arranged on the rail and can move in the X-axis direction; A focusing base, the focusing base is arranged on the moving base; a probe module, the probe module is arranged on the focusing base, and the probe module is provided with a A probe, which can touch the printed circuit board on the stage; a camera unit, the camera unit is set on the focus mount, and the focus mount can adjust the camera A focal length of the unit to take an image of the printed circuit board; a control unit, the control unit can calculate and set the corresponding coordinate relationship between the probe module and the camera unit in advance; it is characterized in that the control unit can Calculate the optimal focus acquisition height of the camera unit on the printed circuit board according to the height measured by the probe touching the printed circuit board, and make the camera unit automatically move to the height to obtain a clear image.

Description

Printed circuit board inspection device

The invention relates to an inspection device, in particular to a printed circuit board inspection device used for inspecting a printed circuit board, and the inspection lens on the printed circuit board can quickly focus.

At present, line scanning cameras for printed circuit board inspection devices have been commonly used. Figure 1 is a conventional printed circuit board inspection device. One of the line scanning cameras P1 is located on a focusing base 3 and can be along the Z axis not shown in the figure. The focus mount 3 is arranged on a moving base 2 and can be moved in the X-axis direction on a rail holder 11 so that the line scan camera P1 can move in the X-axis or Z-axis direction. A printed circuit The plate B is placed on a carrier 4 and the carrier 4 can be translated in the Y-axis direction, and the X-axis, Y-axis, and Z-axis directions are perpendicular to each other. When performing the inspection, the line scan camera P1 starts to move in the X-axis direction after focusing on the printed circuit board B and allows the line scan camera P1 to perform line scan. After scanning, the operator needs to determine whether the acquired image is Clear, if it is not clear, return the line scan camera P1 to the original focus position, adjust the height of the line scan camera P1 in the Z axis direction to adjust the focus, and move it again in the X axis direction, then The line scan camera P1 performs another line scan, and this process needs to be repeated until the scanned image is clear.

Existing printed circuit board inspection devices need to repeatedly adjust the focus and focus process, which not only causes a lot of time waste for the operator, but also each operator's perception of the clearness of the image is different, which easily leads to misjudgment in subsequent inspections.

That is, an object of the present invention is to provide a printed circuit board inspection device capable of quickly focusing.

The printed circuit board inspection device according to the purpose of the present invention includes a carrier for carrying a printed circuit board to move in the Y-axis direction; a rail rack, the rail rack is arranged above the carrier; The moving base is arranged on the rail base, and the moving base can move in the X-axis direction on the rail base; a focusing base, the focusing base is arranged on the moving base; a probe Module, the probe module is set on the focusing base, the probe module includes a probe, and the probe can touch the printed circuit board on the stage A camera unit, the camera unit is set on the focus mount, and the focus mount can adjust the focal length of the camera unit taking an image of the printed circuit board; a control unit, the control unit can calculate in advance And set the corresponding coordinate relationship between the probe module and the camera unit; characterized in that the control unit can calculate the camera unit's response to the height measured by the probe touching the printed circuit board; The optimal focus acquisition height of the printed circuit board makes this camera stand-alone Automatically moved to the height to obtain a clear image.

The printed circuit board inspection device according to the embodiment of the present invention can automatically and quickly adjust the first camera module or the second camera module to the best focus on the printed circuit board according to the height measured by the probe module. Like the height, the operator does not need to repeat the focusing process multiple times, which not only saves time but also avoids misjudgment.

1‧‧‧rail

11‧‧‧ first track

12‧‧‧ second track

2‧‧‧mobile seat

3‧‧‧ Focusing Block

4‧‧‧ carrier

5‧‧‧ Probe Module

51‧‧‧ Probe

6‧‧‧The first camera module

61‧‧‧ first shot

62‧‧‧first light source

7‧‧‧Second camera module

71‧‧‧Second lens

72‧‧‧second light source

8‧‧‧Control unit

9‧‧‧ camera unit

B‧‧‧printed circuit board

P1‧‧‧line scan camera

FIG. 1 is a schematic structural diagram of a printed circuit board inspection device in the prior art.

FIG. 2 is a schematic structural diagram of a printed circuit board inspection device according to an embodiment of the present invention.

FIG. 3 is an enlarged structural diagram of a probe module, a first camera module, and a second camera module in a printed circuit board inspection device according to an embodiment of the present invention.

As shown in FIG. 2 to FIG. 3, the printed circuit board inspection device according to the embodiment of the present invention includes: A carrier 4 is used to carry a printed circuit board B to move in the Y-axis direction; a rail frame 1 is disposed above the carrier 4, and the rail frame 1 includes an X A first rail 11 extending in the axial direction and two second rails 12 extending in the Y-axis direction. The two second rails 12 are located on both sides of the carrier 4. The first rail 11 can be moved in the Y-axis direction on the two second rails 12; a moving base 2 is provided on the first rail 11, and The moving base 2 can move in the X-axis direction on the first rail 11; a focusing base 3, the focusing base 3 is disposed on the moving base 2 and can move in the Z-axis direction; A probe module 5 is provided on the focusing base 3. The probe module 5 includes a probe 51, and the probe 51 can face the carrier 4 below. To the printed circuit board B located on the stage 4, and the probe 51 can be retracted to avoid collision when the moving base 2 or the stage 4 moves; a camera unit 9, said Camera unit 9 is set on the focus mount 3 The focusing base 3 can adjust the focal length of the camera unit 9 for capturing the printed circuit board B. The camera unit 9 includes a first camera module 6 and a second camera module 7. The first camera module 6 includes a first lens 61 and a first light source 62. The second camera module 7 includes a second lens 71 and a second light source 72. A control unit 8 controls the control. A unit 8 is provided on the focus mount 3, and the control unit 8 can calculate and set a coordinate relationship between the probe module 5 and the camera unit 9 in advance, and can touch the probe 51 according to the probe 51. The height measured by the printed circuit board B is used to calculate the optimal focus imaging height of the camera unit 9 on the printed circuit board B, and the camera unit 9 is automatically moved to the height to obtain a clear image.

The first camera module 6, particularly a line scan camera module, is provided on the focusing base 3. The first camera module 6 can be moved in the Z-axis direction to adjust the first camera. The focal length of the module 6 taking an image of the printed circuit board B.

Wherein, the second camera module 7, especially a finger-scanning camera module, is disposed on the focusing base 3 and is located between the first camera module 6 and the probe module 5, and the The second lens 71 has a higher magnification than the first lens 61. The second camera module 7 can also be moved in the Z-axis direction to adjust the second camera module 7 to the printed circuit board B. The focal length of the image.

Wherein, the first camera module 6 is mainly used for inspection. If the image acquired after scanning by the first camera module 6 is partially missing, the second camera module 7 with high magnification can be used for Part of the missing area is reviewed.

In the implementation of the embodiment of the present invention, first, the control unit 8 calculates and sets the coordinate relationships between the probe module 5, the first camera module 6, and the second camera module 7 in advance, and then When the probe 51 on the probe module 5 touches the printed circuit board B on the stage 4, the first camera module 6 or the first camera module 6 can be calculated according to the height measured by the probe 51. The optimal focus acquisition height of the second camera module 7, and finally the focus mount 3 drives the first camera module 6 or the second camera module 7 to automatically move to the height to obtain a clear image; The needle 51 can be extended to touch the printed circuit board B after the focus module 3 drives the probe module 5 down, or the probe 51 can be protruded by the probe module 5 and then driven by the focus module 3 The probe module 5 descends and touches the printed circuit board B, and the first camera module 6 is used as the main inspection. If the image obtained after the first camera module 6 performs line scanning is partially missing Then, the second camera module 7 with a high magnification can be used to perform a re-inspection on a part of the missing area.

When the moving base 2 is disposed on the first rail 11 for X-axis movement, and the first rail 11 is disposed on the two second rails 12 for Y-axis movement, and the focusing base 3Move in the Z-axis direction. Since the X-axis, Y-axis, and Z-axis directions are perpendicular to each other, they are set on the focus mount at this time. The probe module 5, the first camera module 6 and the second camera module 7 on 3 can perform three-dimensional movement simultaneously.

The printed circuit board inspection device according to the embodiment of the present invention can automatically and quickly adjust the first camera module 6 or the second camera module 7 to the printed circuit board B according to the height measured by the probe module 5. The optimal focusing image acquisition height, the operator does not need to repeat the focusing process multiple times, which not only saves time but also avoids the occurrence of misjudgment.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the description of the invention, All are still within the scope of the invention patent.

Claims (10)

A printed circuit board inspection device includes: a carrier for carrying a printed circuit board to move in the Y-axis direction; a rail frame, the rail frame is arranged above the carrier; a moving base, the movement The base is arranged on the rail base, and the moving base can move in the X-axis direction on the rail base; a focusing base, the focusing base is arranged on the moving base; a probe module, The probe module is arranged on the focusing base, the probe module includes a probe, and the probe can touch the printed circuit board on the carrier; a camera Unit, the camera unit is set on the focus mount, and the focus mount can adjust the focal length of the camera unit taking an image of the printed circuit board; a control unit, the control unit can calculate and set the The corresponding coordinate relationship between the probe module and the camera unit; characterized in that the control unit can calculate the camera unit's response to the printed circuit board according to the height measured by the probe touching the printed circuit board Optimal focus acquisition height to make the camera unit move automatically The height to obtain a clear image. According to the printed circuit board inspection device according to item 1 of the scope of patent application, wherein the focusing base is movable along the Z-axis direction. The printed circuit board inspection device according to item 1 or 2 of the scope of patent application, wherein the rail frame includes a first rail extending along the X-axis direction, and two Second rails extending on both sides along the Y-axis direction, the moving base can move in the X-axis direction on the first rails, and the first rails can be on the two second rails The bar moves in the Y-axis direction. The printed circuit board inspection device according to item 1 of the scope of patent application, wherein the camera unit includes a first camera module, and the first camera module includes a first lens and a first light source. The printed circuit board inspection device according to item 4 of the scope of patent application, wherein the camera unit further includes a second camera module, and the second camera module includes a second lens and a second light source. . The printed circuit board inspection device according to item 4 of the scope of patent application, wherein the first camera module is a line scan camera module. The printed circuit board inspection device according to item 5 of the scope of patent application, wherein the second camera module is a surface scanning camera module, which is disposed between the first camera module and the probe module. . The printed circuit board inspection device according to item 5 of the scope of patent application, wherein the second lens has a higher magnification than the first lens. According to the printed circuit board inspection device according to item 5 of the scope of patent application, wherein the first camera module is a main inspection module, and the second camera module is a re-inspection module. The printed circuit board inspection device according to item 1 of the scope of patent application, wherein the control unit is disposed on the focus mount.