JPS6358180A - Circuit test board - Google Patents

Abstract

PURPOSE:To stabilize a measuring position, increase the reliability of a test and reduce a test cost by directly forming contact terminals on a test board and holding plungers, springs and tail pins by a middle plate. CONSTITUTION:A test board is composed of an upper plate 1, a middle plate 2 and a lower plate 3 and provided with through-holes that engage measuring terminals each composed of a plunger 4, a spring 5 and a tail pin 6 in the upper plate 1, middle plate 2 and lower plate 3. The spring 5 is positioned between the plunger 4 and the tail pin 6 and in the through-hole of the middle plate 2 and lets the plunger 4 and the tail pin 6 resiliently abut against the upper plate 1 and the lower plate 3, respectively. The plunger 4 is on the side of the terminal in contact with a circuit board and the tail pin 6 is connected to the body of a tester via a lead wire. Thus, since the tip of the plunger 4 in contact with the circuit board is given a contact pressure by the spring 5 and an follow an unevenness, if ever, in the measuring portion of the circuit board, contact is secured and pitches between the adjacent measuring terminals can be minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a circuit test board used for checking the operation of a circuit board.

[Summary of the invention]

By directly holding the contact terminal in the circuit test port 0 used for confirming the operation of the circuit board of the present invention without using a separate contact probe, the mounting structure is simplified and finer details are achieved. This makes it possible to form contact terminals at pitches.

[Conventional technology]

As shown in FIG. 2, the conventional test board has a receptacle 8 inserted into a plurality of through holes drilled at predetermined positions, and a contact probe 7 having a spring 5 inserted therein. , we have used the tip of a contact probe as a measurement terminal to check the operation of circuit boards. Here, due to constraints such as the distance A between the measurement terminals and the outer diameters of the receptacle 8 and the contact probe 7, the distance could not be reduced to 0.6 mm or less.

[Problem to be solved by the present invention] However, in the conventional test board, in order to install the contact terminals at closer intervals, it is necessary to ultimately reduce the diameter of the receptacle. Accordingly, it is necessary to make the contact probe thinner. Therefore, it is necessary to make the spring in the probe even thinner. The current limit for use is a spring with a diameter of φ022 culm, and if a contact probe is made using this and a test board is manufactured using a receptacle, the pitch interval A is at a limit of about 06 mm. Therefore, it has been difficult to deal with smaller pitches.

Therefore, the present invention forms terminals directly on the test board without using probes and receptacles.
[Means for solving the problem] In order to solve the above problem, the test board of the present invention has a plurality of measuring terminals. In a circuit test board used for checking the operation of a circuit board, the measurement terminal includes a plunger, a spring, and a tail pin;
a middle plate provided with a through hole into which the measurement terminal is attached; and an upper plate arranged to sandwich the middle plate and locked to the middle plate so as to hold the tail pin and the plunger. It is characterized by having a plate and a lower plate.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a test board according to the present invention. The test board is composed of an upper plate 1, a middle plate 2, and a lower plate 3. A through hole is provided to fit the parts that make up the terminal.

The measurement terminal is composed of a plunger 4, a spring 5, and a tail pin 6. The measurement terminal is located between the plunger 4 and the tail pin, and is located in the through hole of the middle plate 2. A plunger 4 and a tail pin 6 are brought into elastic contact with an upper plate 1 and a lower plate 3 that regulate the axial position of the piston.

The plunger 4 is on the terminal side that comes into contact with a circuit board (not shown), and is connected to the tester main body (not shown) by a 6-piece tail pin lead wire.

By using the test board of the present invention for inspection, contact pressure is applied by the spring to the tip of the plunger that comes into contact with the circuit board, and even if there are irregularities on the measurement part of the circuit board, it can be followed, so it is reliable. By minimizing the pitch between the measurement terminals, it is possible to measure even if there are many measurement points and narrow pitch spacing.The measurement terminals are also composed of few parts that can be standardized. It is something that can be done.

〔Effect of the invention〕

According to the present invention, as described above, a direct contact terminal is formed on the test board, and the plunger, spring, and tail pin are held by the middle plate.

(2) The thickness of the outer wall of the receptacle and contact probe becomes unnecessary, and the pitch interval can be reduced by that thickness.

■ Contact resistance between the receptacle and probe is reduced, improving inspection reliability.

■ Reducing the number of parts saves costs for manufacturing test boards.

■ Since there is no outer wall of the probe, there is no resistance due to interference between the outer wall and the spring, keeping the contact pressure constant and improving malfunctions caused by interference.

■ The measurement position is stable because there is no variation in the measurement terminal position due to unstable fitting between the receptacle and the contact probe.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a circuit board tester according to the present invention, and FIG. 2 is an n-side view of a conventional circuit board. 1... Upper plate 2... Middle plate 3... Lower plate 4... Plunger 5... Spring 6...・Tail pin 7...Contact probe 8...Receptacle A...Pitch interval 9...Support plate or above Applicant Seiko Epson Corporation Figure 2

Claims (1)

[Claims] In circuit test boards that have multiple measurement terminals and are used to check the operation of circuit boards, plungers,
the measuring terminal consisting of a spring and a tail pin; a middle plate provided with a through hole into which the measuring terminal is attached; and a middle plate arranged to sandwich the middle plate and holding the tail pin and the plunger. A circuit test board characterized by having an upper plate and a lower plate fixed to a middle plate.