JPS608429Y2 - Transistor insulation sheet - Google Patents

Description

[Detailed description of the invention] This invention relates to an insulating sheet for a transistor.

Conventionally, there has been an insulating sheet of this type as shown in FIG.

In the figure, 1 is an insulating sheet made of an insulating material such as mica, 11 is an insulating bush for attaching the transistor to the heat sink, and mounting holes for passing machine screws, 12, 13, 14
are holes through which each electrode lead of the transistor passes.

Next, Fig. 2 is a longitudinal sectional view showing an example of the installation state.
In Figure 2, 1 is an insulating sheet, 2 is To-2205
1' transistor, which is composed of a mounting portion 2a in which a mounting hole is formed, a main body 2b, and an electrode lead 2c.

3 is a heat sink, 4 is a circuit board, 5 is a machine screw, 6 is an insulating bush, 7 is a flat washer, 8 is a spring washer, and 9 is a nut.

As shown in the figure, the mounting hole 11 shown in FIG.
Then, the transistor 2 is attached to the heat sink 3 and the circuit board 4 through the insulating sheet 1 by passing the insulating bushing 6 and machine screw 5, and is tightened with a nut 9 together with a flat washer 7 and a spring washer 8.

Further, the electrode leads of the transistor 2 are soldered to the circuit board 4 through the electrode lead holes 12, 13, and 14 shown in FIG.

In this way, the insulating sheet 1 connects the transistor 2 and the heat sink 3.
Moreover, in addition to the mounting hole 11, it has electrode lead holes 12, 13, and 14.
During installation, it was possible to prevent insulation defects due to misalignment of the insulating sheet 1.

However, the conventional insulating sheet 1 has mounting holes 1 as described above.
Since only one transistor 1 is formed, when attaching multiple transistors 2, the corresponding number of transistors is required.Also, the electrode lead 2c is bent and the electrode lead holes 12, 13, .
14, if you do not use it through the mounting hole 1 of the insulation sheet 1.
This has the disadvantage that it is not possible to prevent displacement due to rotation about the transistor 2 and the heat sink 3, and the transistor 2 and the heat sink 3 cannot be sufficiently insulated from each other.

This idea was made in order to eliminate the above-mentioned drawbacks of conventional transistor insulating sheets, and the size of the insulating sheet was made to be large enough to insulate the entire mounting part, main body, and electrode leads of the transistor. In addition, by forming multiple mounting holes for mounting multiple transistors, it is possible to install multiple transistors, eliminate misalignment due to rotation, prevent insulation defects, and completely install the transistors. The purpose is to provide an insulating sheet for transistors that insulates transistors.

An embodiment of this invention will be described below with reference to FIG.

10 is an insulating sheet having an area where two To-22 (W transistors can be attached) 101,10
Reference numeral 2 denotes an insulating bushing for mounting the transistor, and a mounting hole through which a small screw or the like is passed.

The insulating sheet 10 configured as described above is capable of mounting two transistors, and each transistor is mounted using the holes 101 and 102 in the same manner as the conventional example shown in FIG. Insulating bushing 6, machine screw 5,
This is done using a flat washer 7, a spring washer 8, and a nut 9.

The insulating sheet 10 is a mounting portion 2a of the transistor 2.

Since the main body 2b and the electrode lead 2c are sized to be electrically insulated from the heat sink 3, the transistor 2 and the heat sink 3 can be completely insulated.

Moreover, since the insulating sheet 10 is positioned without rotation by the two machine screws 5 and insulating bushings 6 passing through the holes 101 and 102, insulation defects due to displacement of the insulating sheet 10 can be prevented.

Further, since rotation of the insulating sheet 1 can be prevented by the attachment holes 101 and 102, holes for attaching the electrode leads 2c are not required.

As described above, in this invention, the size of the insulating sheet is large enough to insulate the mounting part of the transistor, the main body, and the entire electrode lead, and multiple mounting holes are formed for mounting multiple transistors. , it is possible to provide a transistor insulating sheet that allows a plurality of transistors to be attached, eliminates displacement due to rotation, prevents insulation defects, and completely insulates the transistors.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an insulating sheet of a conventional transistor, and FIG. 2 is a longitudinal sectional view showing how a transistor using a conventional insulating sheet is assembled. FIG. 3 is a plan view of an insulating sheet of a transistor according to an embodiment of this invention. In the figure, 2...Transistor, 2a...Mounting part, 2b...Body, 2c...Electrode lead, 10...Insulating sheet, 101,102・
...The hole is for mounting the transistor. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In an insulating sheet for a transistor that is disposed between a transistor attached to a circuit board and an electrically conductive heat sink that radiates heat from the transistor and electrically insulates the transistor and the heat sink from each other, the insulating sheet An insulating sheet for a transistor, characterized in that the sheet is sized to insulate the entire transistor including the mounting portion, main body, and electrode lead, and is formed with a plurality of mounting holes for mounting a plurality of transistors.