JPS62245975A - In-circuit test fixture - Google Patents

Abstract

PURPOSE:To enable a robot to hold the periphery of a printed board to be tested by providing a pressure rod which presses a top plate toward the bottom surface of a fitting tool base and an expandable/contractable guide pin which positions the printed board to be tested. CONSTITUTION:The top plate 110 is held by a spring 106, and the printed board 1 to be tested is positioned by engaging the conic tip of the guide pin 104 with the guide hole of the printed board 1 through the hole of the top plate 110 and held airtight by the top plate 110 through a rubber seal 1. Then, the air in a fitting tool is sucked through a discharge port 102 to press the top plate 110 and printed board 1 toward the bottom surface of the fitting tool base 100, and incorporated springs in the pin 104 and a contact groove 105 flex to bring the tip of the probe 105 into contact with the printed board 1 through the hole of the top plate 110. Then, high-pressure air is applied to the rod 101 through an air tube 103 to move the top plate 110 toward the bottom surface of the base 100, and then the top plate 110 and printed board 1 are separated from each other to enable the robot 200 to grip the periphery of the printed board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an in-circuit test fixture used in an in-circuit tester for electrically connecting a printed board to be tested and the in-circuit tester.

[Prior art] Conventionally, this type of in-circuit test fixture is
The printed board under test is attached to the top plate, which has guide pins for positioning the printed board under test and a rubber seal to maintain airtightness according to the surrounding shape of the printed board under test, and the air inside the fixture is vacuumed. By suctioning with a pump, the printed board to be tested is brought into close contact with the top plate and moved toward the bottom of the fixture base. A contact glove electrically connected to the in-circuit tester is attached to the fixture base, and when the top plate and the printed circuit board under test approach the bottom of the fixture base, the tip of the contact probe passes through the small hole in the top plate. , contacts the printed board under test, and electrical connection between the printed board under test and the in-circuit tester is established.

[Dark problems to be solved] The conventional in-circuit test fixture described above has
In order to ensure good airtightness between the top plate and the printed circuit board under test, the rubber seal is always in close contact with the periphery of the printed circuit board under test, so the printed circuit board under test can be attached and removed from the top plate by a robot. When trying to do this, since it is impossible to grasp the printed board under test by grasping the area around it, it is necessary to prepare a structure for the robot to handle the printed board under test in order for the robot to handle the printed board under test with components mounted on it. There was a drawback that had to be done.

[Means for Solving Problems] The in-circuit test fixture of the present invention that solves the above-mentioned conventional problems is a vacuum-type in-circuit test fixture.

A pressure rod for pushing the top plate toward the fixture base, and a pressure rod that is attached to the fixture base and whose tip passes through the small hole in the top plate to position and hold the printed board under test, and is expandable and retractable by a built-in spring. This configuration includes a guide pin.

[Examples] Next, the present invention will be described in detail with reference to the drawings showing preferred embodiments.

FIG. 1 is an external view of an in-circuit test fixture according to an embodiment of the present invention. fixture base 10
A pressure rod 101 for pushing the top plate 110 is attached to the 0. Top play) 11
A rubber seal 111 is attached to the top plate to maintain airtightness between the printed board under test and the top plate, and a small hole is provided for the tip of the contact probe and guide pin 104 attached to the fixture base lOO to pass through. It's dawning.

The top plate 110 is held by a spring built into the fixture base 100, and the exhaust port 102
By sucking more air inside the fixture, the top plate 11O moves toward the bottom surface of the fixture base lOO.

Also top play) 110 is pressure rod lO1
By sending high-pressure air through the air tube 103 to the fixture base 100, the structure is such that the fixture base 100 is pressed against the bottom surface of the fixture base 101 by the pressure rod 101.

Next, the operation of this embodiment will be explained using FIG. 2-1, FIG. 2-2, and FIG. 2-3.

2-1, 2-2, and 2-3 are sectional views of the embodiment shown in FIG. 1, respectively. Figure 2-1 shows the printed board 1 under test.
The fixture has just been attached to the top plate 110, and the state in which the air inside the fixture is not sucked through the exhaust port 12 and the top plate is not pressed by a pressure rod using high-pressure air is shown. here,
The top play) 110 is held by a spring 106. The printed board under test l is positioned in the horizontal direction by the conical tip of the guide pin 104 passing through a small hole in the top plate 110 and hooking into the guide hole of the printed board under test l.
10 and is held airtight via a rubber seal 111.

FIG. 2-2 shows that the air inside the fixture is absorbed through the exhaust port 102 from the state shown in FIG. The guide pin 10 is shown being pushed in the direction and stopped by the stopper 107.
4 and the contact probe 105 are shortened by the bending of their built-in springs, and the tip of the contact probe 105 passes through a small hole in the top plate 110 and comes into contact with the printed board l to be tested.

Figure f+12-3 shows a state in which high-pressure air is applied to the pressure rod 101 through the air tube 103 from the state shown in Figure 2-1, causing the pressure rod 101 to extend and move the top play 110 toward the bottom of the fixture base 100. shows. Since no external force is applied to the printed board under test, it is held by the spring pressure built into the guide pin 104, and top play is achieved.
0 and the printed board under test l are separated. This allows the robot 200 to grasp the periphery of the printed board l to be tested.

[Effects of the Invention] As explained above, the present invention provides a vacuum type in-circuit test fixture that includes a pressure rod for pushing the top plate toward the bottom of the fixture base, a pressure rod that is attached to the fixture base, and a pressure rod that presses the top plate toward the bottom of the fixture base. The printed board to be tested is installed and removed from the top plate by a robot using an i-ha, which has an extendable guide pin with a built-in spring that allows the positioning and holding of the printed board to be tested through a small hole in the top plate. In this case, the top plate is moved toward the bottom of the fixture base using the pressure rod, and the guide pins protruding through the small holes in the top plate hold the printed board under test and separate it from the top plate (19).
This allows the robot to hold the area around the printed board under test, and therefore has the effect of eliminating the need for a structure for the robot to handle the printed board under test on which components are mounted.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an in-circuit test fixture according to an embodiment of the present invention. FIG. 2-1, FIG. 2-2, and FIG. 2-3 are sectional views each illustrating the operation of an in-circuit test fixture according to an embodiment. l: Printed board under test 100: Fixture base 101: Pressure rod 102: Exhaust port 103: Air tube 104 Guide pin 105: Contact probe 106: Spring 107: Stopper 110:) Stub plate 111: Rubber seal 200: Robot

Claims (1)

[Claims] In a vacuum-type in-circuit test fixture, there is a pressure rod that pushes the top plate toward the fixture base, and a pressure rod that is attached to the fixture base and whose tip passes through a small hole in the top plate to position and hold the printed board under test. An in-circuit test fixture characterized by having a guide pin that can be expanded and contracted by a built-in spring.