JPH0523118U - Inspection device for printed wiring board - Google Patents

Abstract

(57) [Summary] [Purpose] To correct the columns or distortions near the imaging area of the printed wiring board 5 to eliminate defocusing and enable accurate inspection. [Structure] Rollers 7a and 7b for pressing the vicinity of an image pickup area of a printed wiring board 5, and supporting arms 8 for these rollers 7a and 7b.
Vertical drive mechanisms 6a and 6b for vertically moving via a and 8b
Are provided to forcibly correct the row or distortion of the printed wiring board 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a printed wiring board inspection device, and more particularly to a printed wiring board inspection device for inspecting the relative position of a wiring pattern and a through hole and the wiring pattern itself.

[0002]

[Prior Art]

 Conventionally, this type of printed wiring board inspection apparatus has a transparent glass inspection table on which the printed wiring board is placed, a transmission light source that irradiates light from under the inspection table, and a printed wiring board from above. , A one-dimensional CCD camera that captures the light transmitted and reflected from the printed wiring board and captures the wiring pattern and through holes of the printed wiring board, and the one-dimensional CCD camera. It had a display that draws wiring patterns and through holes according to signals.

This inspection apparatus for a printed wiring board inspects by displaying on the display the shape of the wiring pattern itself on the front and back of the printed wiring board, the presence or absence of wiring breakage, the presence or absence of disconnection, and the quality of the relative position to the through hole. Was going on. In particular, in this printed wiring board inspection device, the image of the through hole is clearly displayed by using transmitted light, and the relative position of the wiring pattern and the through hole is inspected.

[0004]

[Problems to be solved by the device]

 In this conventional printed wiring board inspection device, the edge of the printed wiring board installed on the inspection table was fixed with an adhesive tape and fixed and imaged with a one-dimensional CCD camera. In that case, the presser foot was not perfect, and floating development occurred, and the captured image was blurred, making inspection difficult. For this reason, there was a problem of overlooking defects.

An object of the present invention is to provide an inspection device for a printed wiring board that can be inspected accurately without causing a focus in order to solve such a problem.

[0006]

[Means for Solving the Problems]

 The printed wiring board inspection device moves in the horizontal direction and has a light-transmissive inspection table on which the printed wiring board is placed, and is installed above the inspection table and projects light onto the surface of the printed wiring board. It is composed of a reflective light source, a transmissive light source that is installed under the inspection table and projects light onto the back surface of the printed wiring board, and a plurality of image pickup devices arranged along the reflective light source. In a printed wiring board inspection apparatus having a one-dimensional CCD camera, an elastic roller that presses the vicinity of the imaging area of the printed wiring board against the inspection table, and a roller that presses the roller against the printed wiring board or separates the rollers. And a drive mechanism for making it move.

[0007]

【Example】

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a printed wiring board inspection apparatus according to an embodiment of the present invention. As shown in FIG. 1, this printed wiring board inspecting apparatus includes elastic rollers 7a and 7b that hold down both sides of the image pickup area of the printed wiring board 5, and rollers 7a and 7b that support arms 8a and 8b. That is, the up-and-down drive mechanisms 6a and 6b that move up and down are provided. Other than that, it is the same as the conventional example.

FIGS. 2A and 2B are diagrams showing the order of operation in order to explain the operation of the printed wiring board inspection apparatus of FIG. Next, the operation of this printed wiring board inspection apparatus will be described. First, as shown in FIG. 2 (a), the printed wiring board 5 having rows is placed on the inspection table 1. Next, as shown in FIG. 2 (b), the vertical drive mechanisms 6a and 6b operate, and the rollers 7a and 7b press the printed wiring board 5 across the imaging area to force the rows to be printed. 5 are on the same plane, then the light source for reflection 4b and the light source for transmission 3 are turned on, the inspection table is moved in one direction, and the printed wiring between the rollers 7a and 7b is moved by the one-dimensional CCD camera 2. In this way, the inspection table 1 is moved in one direction in the direction shown by the arrow to forcibly configure the unevenness of the printed wiring board 5 so that the focus position of the CCD camera always prints. This is to match the surface of the wiring board.

FIG. 3 is a perspective view of a printed wiring board inspecting apparatus according to another embodiment of the present invention, and FIGS. 4A and 4B are operation order for explaining the operation of the printed wiring board of FIG. FIG. This inspection apparatus for a printed wiring board is provided with an elastic roller 7c that holds down only one side of the imaging area, and a vertical drive mechanism 6c, 6d for vertically moving the roller 7c via support arms 8c, 8a. It was installed on both sides of 1.

That is, in the above-described embodiment, in contrast to the mechanism in which two long rollers hold down both sides of the imaging area of the printed wiring board 5, in this embodiment, a plurality of cantilevered rollers 7c are taken as an example. The printed wiring board 5 is pressed down by arranging it on one side of the area, and vertically moving the rods connected by the support arms 8c and 8d by the vertical drive mechanisms 6c and 6d. This embodiment is suitable for a printed wiring board having a relatively large board thickness.

This is because in the case of a thin printed wiring board, distortion is likely to occur in the part in addition to the entire warp, and it is necessary to suppress the entire surface. Also, a thick printed wiring board has no rows or distortions locally even if there is an entire row, and if it is partially pressed, it will be corrected. Furthermore, in this embodiment, since only one side of the image pickup area is pressed down, the other side is open, so that there is an advantage that the operability of the apparatus is excellent.

Next, the operation for this printed wiring board will be described. First, as shown in FIG. 4A, the printed wiring board 5 having rows is placed on the inspection table 1. At this time, the roller 7c stands still upward by the vertical drive mechanisms 6c and 6d. Next, the vertical drive mechanisms 6c and 6d operate, and the roller 7c forcibly presses the printed wiring board 5 to bring it into close contact with the inspection table 1. Next, the inspection table 1 moves in the direction of the arrow, and the one-dimensional CCD camera 2 images the printed wiring board 5.

The vertical drive mechanism may be configured by a solenoid, a pneumatic cylinder, or a hydraulic cylinder drive and a guide mechanism. Particularly, a pneumatic cylinder is advantageous because it has pneumatic compressibility. Is.

[0015]

[Effect of the device]

 In addition to the above description, the present invention provides a roller that presses the vicinity of the image pickup area of the printed wiring board and forcibly corrects the rows or distortions, thereby making it possible to take an image without defocusing the camera and perform an accurate inspection. The effect is that an inspection device for wiring boards can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a printed wiring board inspection apparatus according to an embodiment of the present invention.

2A to 2D are diagrams showing the operation sequence for explaining the operation of the printed wiring board inspection apparatus of FIG.

FIG. 3 is a perspective view of a printed wiring board inspection device according to another embodiment of the present invention.

4A to 4C are diagrams showing an operation sequence for explaining the operation of the printed wiring board inspection apparatus of FIG.

[Explanation of symbols]

 1 Inspection table 2 One-dimensional CCD camera 3 Light source for transmission 4a, 4b Light source for reflection 5 Printed wiring board 6a, 6b, 6c, 6d Vertical drive mechanism 7a, 7b, 7c Roller 8a, 8b, 8c, 8d Support arm

Claims (1)

[Scope of utility model registration request] 1. A light-transmissive inspection table which moves horizontally and mounts a printed wiring board, and a reflection light source which is installed above the inspection table and projects light onto the surface of the printed wiring board. And a one-dimensional CCD camera including a light source for transmission, which is installed below the inspection table and projects light on the back surface of the printed wiring board, and a plurality of image pickup elements arranged along the light source for reflection. In a printed wiring board inspecting device having: a roller of an elastic body that presses the vicinity of an image pickup area of the printed wiring board against the inspection table; An inspection apparatus for a printed wiring board, comprising: