JP2002009500A - Method and device for visually inspecting printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for visually inspecting a printed board where a printed board and mounted condition of its part are efficiently and precisely visually inspected. SOLUTION: A printed board 1 and mounting condition of its part are taken into a signal processing device 4 using an optical read device 2, and the entire image or partial image of the printed board 1 is displayed on a screen 9a of a display device 9 connected to the signal processing device 4. Meanwhile, an inspection work instruction content 11 about the printed board 1 and the mounting condition of its part is displayed on the screen 9a. On the screen 9a, the printed board and the mounting condition of its part are visually inspected according to the inspection work instruction centent 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and apparatus for visually inspecting a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, when inspecting the mounting state of a printed circuit board and components on the printed circuit board, a human inspects it visually. In this case, since the inspection target part is minute and the number thereof is not small, the inspection target part of the printed circuit board is observed with a magnifying glass, and the enlarged part is designated as a booklet state or book state inspection work instruction. This was done by checking the contents of the book.

[0003]

However, in the above-mentioned method using visual inspection with a magnifying glass and an inspection operation instruction in a booklet or book state, the inspection operation instruction must be viewed for each part, and the enlargement is required. The line of sight must be moved frequently between the printed circuit board and the inspection work instructions, which requires a great deal of time and effort in the inspection, and the inspector is also fatigued accordingly. There is a problem of oversight.

On the other hand, instead of visual observation using a magnifying glass, an optical reading device such as a CCD camera is used.
2. Description of the Related Art A whole or part of a printed circuit board is read by appropriately enlarging it, and an entire image or a partial image obtained by the reading is displayed on a display screen of a display device connected to a computer.

[0005] However, in the method using the optical reading device, as a specific inspection method, as in the case of using the magnifying glass, an inspection operation instruction in a booklet state or a book state is used for each component. It is necessary to compare the contents of the instruction with the whole image or the partial image of the printed circuit board displayed on the display screen, and it is inevitable that a considerable time is required for the inspection.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has as its object to provide a method for visually inspecting a printed circuit board which can efficiently and accurately mount a printed circuit board and components on the printed circuit board. And equipment.

[0007]

In order to achieve the above object, a visual inspection method for a printed circuit board according to the present invention is provided. While displaying the entire image or a partial image of the printed circuit board on the display screen of the display device connected to, while displaying the inspection work instruction content on the mounting state of the printed circuit board and components on the display screen, in this display screen, The mounting state of the printed circuit board and components is visually inspected in accordance with the contents of the inspection operation instruction.

In the method for visually inspecting a printed circuit board according to the present invention, the mounting state of the printed circuit board and components to be visually inspected is imaged by an optical reading device such as a CCD camera, and the output signal is output from a computer or the like. Image processing is performed in the signal processing device, and the mounting state of the printed circuit board and components is displayed on a display screen of a display device connected to the signal processing device. And then,
Inspection work instruction contents for inspecting the mounting state of the printed circuit board and components are displayed together with the display screen. On the display screen, the inspector visually checks the mounting state of the printed circuit board and components by checking the mounting state of the printed circuit board and components for each component or for each area of the printed circuit board according to the work instruction. can do.

Therefore, unlike the related art, there is no need to check the inspection items and the like by turning over the pages of the inspection instruction sheet, thereby greatly reducing the work load on the inspector. As a result, the visual inspection of the printed circuit board can be performed with high accuracy and efficiency for a long time.

As a specific apparatus for carrying out the method for visually inspecting a printed circuit board, a visual inspection apparatus for a printed circuit board according to the present invention comprises: an optical reading device for reading a mounting state of a printed circuit board and components; A storage medium storing inspection work instruction contents relating to a mounting state of a board and components, a signal processing apparatus having a function of processing a signal from the optical reading device and a function of reading the contents of the storage medium; A display device that is connected to the device and displays an entire image or a partial image of the printed circuit board and the content of the inspection operation instruction based on a signal from the signal processing device.In the display screen of the display device, Therefore, the mounting state of the printed circuit board and components can be visually inspected.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an example of an apparatus for carrying out a visual inspection method for a printed circuit board according to the present invention. In this figure, reference numeral 1 denotes a printed circuit board as an object to be inspected, which is inspected at a predetermined inspection position. Set by a member (not shown). Although not shown, appropriate electronic circuit components are mounted on the surface of the printed board 1.

Reference numeral 2 denotes a TV camera as an optical reading device provided above the inspection position, which is constituted by, for example, a CCD camera, and is provided above the printed circuit board 1. The TV camera 2 moves above the inspection position in any of the arrow X direction (left-right direction on the paper), the arrow Y direction (direction perpendicular to the paper), and the arrow Z direction (up-down direction on the paper). It is configured to be held and driven by the XYZ direction driving device 3 so that
The output signal is sent to a video capture board (described later) in the signal processing device. Note that the XYZ direction driving device 3 is controlled by a signal processing device.

Reference numeral 4 denotes a signal processing device which controls the entire apparatus and processes signals from the TV camera 2 and signals from a database (to be described later) and an input device (to be described later), and has an image processing function and an arithmetic control function. It comprises a computer such as a personal computer provided with various processing boards such as a video capture board 4a, a network board 4b, an I / O board 4c, and a sound board 4d.

Various devices are connected to the signal processing device 4. That is, reference numeral 5 denotes a database serving as a storage medium connected to the signal processing device 4 via the LAN 6, for example, which stores inspection operation instruction contents of the printed circuit board 1 to be inspected, for example, inspection items, inspection methods, check points, and the like. The output signal is input to the network port 4b. And 7 is an input device,
For example, an input switch 7a and a mouse 7b
/ O board 4c. This input device 7
It is possible to call data in the database 5 or issue a command for appropriately moving the position of the TV camera 2. Reference numeral 8 denotes a speaker, which is connected to the sound board 4d.

Reference numeral 9 denotes a display device capable of color display such as a CRT. The display screen 9a has an image (showing a mounting state of the TV camera 2 on the printed circuit board 1 based on an output signal from the signal processing device 4). Mounting state image) 1
0 and the inspection work instruction contents 11 from the database 5 are displayed. In this embodiment, an image (mounting state standard image) 12 representing a standard mounting state on the printed circuit board 1 can also be displayed.

Next, the operation of the printed circuit board visual inspection apparatus having the above configuration will be described. The printed board 1 to be inspected is set at a predetermined inspection position. Then, the code attached to the printed circuit board 1 is input to the input switch 7a.
, The input contents are processed in the signal processing device 4, the coordinates are obtained from the database 5, a control signal is sent from the signal processing device 4 to the XYZ direction driving device 3, and the TV camera 2 is Moves to a position corresponding to the printed circuit board 1.

When the input switch 7a is further pressed, the TV camera 2 moves to the designated coordinates on the printed circuit board 1, captures the mounted state of the components on the surface of the printed circuit board 1, and displays the mounted state image on a display device. 9 display screen 9a
It is displayed as indicated by reference numeral 10 above. At this time, inspection operation instruction contents 11 such as inspection items, inspection methods or check points corresponding to the image 10 and a mounting state standard image 12 are displayed on the display screen 9a by operating the input switch 7a. Is displayed.

That is, on the display screen 9a of the display device 9, an image 10 showing the mounting state of the components on the printed board 1 to be inspected and the contents of the inspection work instruction used for visual inspection of the printed board 1 11 and the mounting state standard image 12 are displayed at the same time, so that the inspector can visually inspect the image 10 according to the inspection work instruction contents 11. In this case, since the mounting state standard image 12 is simultaneously displayed on the display screen 9a, the image 12 and the image 10 representing the mounting state are compared to visually check the printed circuit board 1. Inspection can be performed reliably.

If the inspection work instruction contents 11 describe the structure and mounting state of the details of the printed circuit board 1, the TV camera 2 is moved to enlarge the details of the printed circuit board 1 and the inspection work is performed. The printed circuit board 1 may be visually inspected according to the inspection item, inspection method, or check point described in the instruction content 11.

When the visual inspection is carried out, the contents of the inspection work instruction 11 may be displayed on the screen and the contents thereof may be output as voice.

The present invention can be implemented with various modifications. For example, the mounting state standard image 12
It may indicate an allowable range such as the color of the surface of the printed circuit board 1 or the mounting position of the electronic component. The mounting state standard image 12 is not always necessary, and the inspection work instruction contents 11 necessary for the inspection of the printed circuit board 1 are displayed on the display screen 9a in synchronization with the image 10 of the mounted state of the printed circuit board 1. It is good if you do.

Further, the inspection work instruction content 11
Display screen 9a so as to synchronize images from V camera 2
Instead of displaying the image 10 on the TV 10
The inspection work instruction content 11 and the mounting state standard image 12 may be synchronized with the operation.

[0023]

As described above, according to the present invention, the mounting state of the printed circuit board to be visually inspected,
The inspection work instructions for inspecting the mounting state of the printed circuit board and components are simultaneously displayed on a single display screen, and the mounting state of the printed circuit board and components is visually inspected according to the inspection work instructions. Therefore, there is no need to look at the booklet state or book state inspection work instruction, and therefore, the work load on the inspector is greatly reduced. In addition, oversight in inspection can be reduced. As a result, the visual inspection of the printed circuit board can be performed with high accuracy and efficiency for a long time.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing an example of an apparatus for carrying out a visual inspection method for a printed circuit board according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Printed circuit board, 2 ... Optical reading device, 4 ... Signal processing device, 5 ... Storage medium, 9 ... Display device, 9a ... Display screen.

Claims (2)

[Claims] 1. A printed circuit board and parts mounted state are taken into a signal processing device by an optical reading device, and an entire image or a partial image of the printed circuit board is displayed on a display screen of a display device connected to the signal processing device. Displaying on the display screen an inspection operation instruction content relating to the mounting state of the printed circuit board and the component, and visually inspecting the mounting state of the printed circuit board and the component according to the inspection operation instruction content in the display screen. A visual inspection method for a printed circuit board, characterized in that: 2. An optical reading device for reading a mounting state of a printed circuit board and components, a storage medium storing inspection work instruction contents relating to a mounting condition of the printed circuit board and components, and a signal from the optical reading device. A signal processing device having a function and a function of reading out the contents of the storage medium, and connected to the signal processing device to display an entire image or a partial image of the printed circuit board and an inspection operation instruction content based on a signal from the signal processing device. A visual inspection apparatus for a printed circuit board, characterized in that a mounting state of the printed circuit board and components can be visually inspected on a display screen of the display apparatus in accordance with the contents of the inspection operation instruction.