JPS62201Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transistor mounting device for connecting and mounting electronic components such as coils and capacitors to lead terminals such as the collector, emitter, and base of a transistor.

Conventionally, power transistors used in television receivers and the like have been equipped with a power transistor that is close to the power transistor, as shown in Figure 1, in order to eliminate interference with other electrical circuits within the device due to switching noise caused by high frequency components. The coil and capacitor are connected like this.

The one shown in FIG. 1 connects one end of the coil L ₁ to the base terminal 2 of the power transistor 1,
One end of a coil L ₂ is connected to the emitter terminal 3, and a capacitor C is connected between the other end of the coil L ₂ and the collector terminal 4 in an attempt to eliminate switching noise due to high frequency components.

By the way, the coil L ₁ , the coil L ₂ and the capacitor C connected to the power transistor 1 as in the conventional electric circuit shown in FIG. 1 are installed with the structure shown in FIGS. 2 and 3. .

That is, in the power transistor 1, the bottom surface of the collar portion 5 of this transistor 1 and the above transistor 1 are connected to each other.
An insulating plate 7 such as a mica sheet is interposed between the heat dissipating plate 6 to which the insulating plate 7 and the heat dissipating plate 6 are attached, and insertion holes 8, 8 and 9, 9 and placed on one side 6a of the heat sink 6. Then, from the other side 6b side of the heat sink 6, there are screw insertion holes 10a formed of an insulating material such as synthetic resin,
The thin diameter portions 10b, 10b at the tips of the insulating bushings 10, 10 having the diameter of 10a are inserted into the transistor 1 through the through holes 11, 11 bored in the heat sink 6, into the flange portion 5.
The insulating bushings 10, 10 are arranged so as to face the screw insertion holes 12, 12 provided in the insulating bushings 10, 10.
A mounting plate 14 having a length of 13 and tapping screw holes 13, 13 is provided, and is inserted through through holes 15, 15 drilled in the insulating plate 7 from the screw insertion holes 12, 12 side of the flange 5, respectively. The transistor 1 is fixed to the heat sink 6 by screwing the tapping screws 16, 16 into the tapping screw holes 13, 13 of the mounting plate 14.

Note that since the outer case of the transistor 1 is the collector terminal 4, it is electrically connected to the mounting plate 14 by a tapping screw 16.

In this way, the transistor 1 is mounted by screwing the tapping screws 16, 16 into the mounting plate 14, with the heat sink 6 interposed between the mounting plate 14 and the transistor 1. The coils L ₁ , L ₂ and the capacitor C connected to each terminal 2, 3, 4 of the transistor 1 are connected via a lug plate 17 attached to the other side 6b of the heat sink 6 close to the transistor 1. can be installed. This lug plate 17 includes a support plate 18 which is an attachment part to the heat sink 6, and an insulating substrate 2 attached to the tip side of this support plate 18 and having conductive parts 19a and 19b on both ends.
0, and is attached by fixing the bent portion 18a provided on the base end side of the support plate 18 to the heat sink plate 6 with screws 21. As shown in FIG. 3, the coil _L2 is connected to the emitter terminal 3 of the power transistor 1 and the conductive part 19a of one of the lug plates 17 by soldering each terminal, and the capacitor C becomes the collector terminal 4. The terminals are similarly soldered and connected between the mounting plate 14 and the one conductive part 19a, and the coil _L1 is connected between the base terminal 2 and the other conductive part 19b by soldering, and the terminals are soldered and connected between the base terminal 2 and the other conductive part 19b. An electric circuit as shown in FIG. 1 is constructed.

According to such a structure, the coil L ₁ ,
To connect L ₂ and capacitor C, each coil
The terminals of L ₁ , L ₂ and the capacitor C are connected to the base terminal 2 of the power transistor 1, the emitter terminal 3, the collector terminal 4 and the conductive parts 19a of the lug plate 17,
19b must be soldered by a manual soldering process, which not only has poor workability, but also causes problems such as the solder floating away from the designated connection part or clumping in one place during the soldering process. It is extremely difficult to prevent the occurrence of defective products due to poor connections. Furthermore, it is necessary to separately attach the lug plate 17 to the heat sink 6 for connecting the coils L ₁ , L ₂ and the capacitor C, which would increase the number of parts and thus reduce the efficiency of the installation work of the power transistor 1. I can't. Also,
Capacitors L ₁ , L ₂ and capacitor C are soldered to the power transistor 1 itself, so when replacing transistor 1 etc. if it becomes defective, the soldered parts must be melted and each electronic component must be replaced. They must be separated, which significantly impairs work efficiency.

Therefore, the present invention enables the coils L ₁ , L ₂ and the capacitor C to be mounted close to the power transistor 1 without using lug plates or the like as in the conventional method described above, thereby improving the mounting work and reducing the number of parts. In addition, transistor 1
It is an object of the present invention to provide a transistor mounting device that can improve serviceability by facilitating replacement work when a failure occurs.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

In the following description, the same members as those of the conventional device described above will be described with the same reference numerals.

In the transistor mounting device according to the present invention, the transistor 1 is similar to the conventional device described above, as shown in FIGS. 4 and 5.
An insulating plate 7 such as a mica sheet is interposed between the lower surface of the flange 5 and a heat sink 6 constituting a part of the chassis to which the transistor 1 is attached, and a base terminal 2 and an emitter terminal 3 as lead terminals are interposed. An insertion hole 8 formed in the insulating plate 7 and the heat sink 6,
8 and 9, and placed on one side 6a of the heat sink 6. Then, from the other side 6b of the heat sink 6, insert the insulating pushing 10, 10 having the screw insertion holes 10a, 10a into the small diameter portion 10 at the tip thereof.
b, 10b are through holes 11, 1 bored in the heat sink 6
A mounting plate 14 is disposed so as to face the screw insertion holes 12, 12 provided in the collar portion 5 of the transistor 1 from the mounting plate 14, and further has tapping screw holes 13, 13 having a length extending between the respective insulating pushings 10, 10. are arranged, and the screw insertion holes 12, 1 of the flange 5 are arranged.
Through-holes 15 drilled in the insulating plate 7 from the two sides,
Tapping screws 16,1 inserted through 15
6 into the tapping screw hole 13 of the mounting plate 14,
13, the transistor 1 is fixed to the radiation plate 6.

By the way, the mounting plate 1 used in the device of the present invention
4 is provided with a pair of mounting leg pieces 32, 32 to which the printed wiring board 31 is mounted. These mounting leg pieces 32, 32 are formed by cutting and raising the connecting portion 33 of the mounting plate 14, and have a locking step portion 34 in the middle that regulates the mounting height of the printed wiring board 31 with respect to the heat sink 6. 34 is provided, and the small diameter portion at the tip thereof is connected to the printed wiring board 3.
It is formed as an insertion part 35, 35 to 1.

In addition, the mounting leg pieces 32, 3 of the mounting plate 14 are
2 are connected to the base terminal 2, emitter terminal 3, and collector terminal 4 of the transistor 1, respectively, to form the electric circuit shown in FIG. Coils L ₁ and L ₂ and a capacitor C are mounted, a predetermined wiring pattern is formed, and lead wires 36 and 37 for external connection are connected. Furthermore, this printed wiring board 31 includes
Insertion holes 38, 38 of the insertion parts 35, 35 are formed at positions corresponding to the insertion parts 35, 35 of the mounting leg pieces 32, 32, and the insertion holes 38, 38 of the insertion parts 35, 38, ,3
Terminal fittings 40, 40 having through-holes 39, 39 for electrical connection with 5 are attached, and insertion holes 41, 41 are formed through which the base terminal 2 and emitter terminal 3 of the transistor are inserted, respectively. 41 and 41 are also provided with through holes 4 for electrical connection with the base and emitter terminals 2 and 3, respectively.
Terminal fittings 43, 43 having numbers 2, 42 are attached. Further, the printed wiring board 31 is provided with through holes 44, 44 through which shaft tips 16a, 16a of the tapping screws 16, 16 for fixing the transistor 1 to the heat sink 6 face.

By the way, the printed wiring board 31 used in the present invention is a part of a main printed wiring board having a relatively large area that constitutes the main electric circuit of an electrical device such as a television receiver to which the transistor 1 is attached. connected and formed simultaneously with this substrate. That is, as shown in FIG. 6, main wiring printed wiring boards 51, 52, 53, 54 that constitute the main electric circuit of the electrical equipment
The present invention utilizes a small space, which would conventionally become a dead space and be cut out and thrown away, in the entire printed wiring board 50 formed by connecting them together through an easy-to-separate line 55 such as a perforation. A printed wiring board 31 to be used is formed. Therefore, since the coils L ₁ , L ₂ and capacitor C, which are the electronic components of the present invention, can be attached to the printed wiring board 31 by automatic mounting, connection by soldering to a predetermined circuit pattern is extremely reliable. Not only does it have high properties, but it can also be formed by using parts that were previously considered unnecessary, so there is no need to incur high costs.

The printed wiring board 31 formed as described above is attached to the mounting leg pieces 32, 32 provided on the mounting plate 14 on the side where the electronic components such as the coils L ₁ and L ₂ and the capacitor C are not mounted. As shown in FIGS. 7 and 8, the insertion holes 3 are inserted into the insertion portions 35, 35 of the mounting leg pieces 32, 32.
8, 38 and locking steps 34, 34
At the same time, the base terminal 2 and emitter terminal 3 of the transistor 1 are inserted into the insertion holes 41, 41, and the shaft tips 16a, 16a of the tapping screws 16, 16 are inserted into the through holes 44, 44, and the mounting leg pieces are 32, 32. Here, by electrically connecting the mounting leg pieces 32, 32 of the mounting plate 14 to the terminal fittings 40, 40, the base terminal 2, the emitter terminal 3, and the terminal fittings 43, 43 with solder 45, the above-mentioned The coils L ₁ , L ₂ and the capacitor C can be connected to the transistor 1 as shown in the electric circuit shown in FIG.

As mentioned above, according to the present invention, electronic components such as coils and capacitors connected to transistors are
Since they are mounted on a printed wiring board and connected to the transistors through this board, these electronic components can be connected by solder dip by dipping them into a solder bath, and a highly reliable connection state can be obtained.

In addition, even if it becomes necessary to replace a transistor, etc., the transistor and the electronic components connected to it can be separated by simply removing the solder from the mounting leg piece of the mounting plate and the connecting part of the printed wiring board. Since they can be integrated, the transistors and electronic components can be replaced independently, making the work extremely easy. In particular, if a socket is used that allows electrical connection to be made simply by inserting the connecting terminals to which the base and emitter terminals are connected, the above-mentioned replacement work will be further facilitated.

Furthermore, the present invention does not use a lug board like the conventional one, and instead uses the part that would otherwise be thrown away as an unnecessary board as the printed wiring board that constitutes the present invention, making it possible to significantly reduce costs.

Furthermore, since the printed wiring board is attached to the mounting leg piece through the side of the printed wiring board on which far-sighted components are not mounted, electronic components cannot be placed within the projected mounting area on this board. This makes it possible to freely select the size of electronic components. Moreover, since the pattern distance between the electronic component and the transistor terminal is shortened, it is also possible to reduce unnecessary radiation.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram for explaining the present invention. FIG. 2 is an exploded perspective view showing a conventional example, and FIG. 3 is a perspective view showing its assembled state. Fourth
The figure is an exploded perspective view showing one embodiment of the present invention.
FIG. 5 is a perspective view of the transistor attached. FIG. 6 is a perspective view of a printed wiring board used in the present invention. FIG. 7 is a perspective view showing the assembled state of the device of the present invention, and FIG. 8 is a side sectional view thereof. 1...Transistor, 2...Base terminal, 3...
... Emitter terminal, 4 ... Collector terminal, 6 ... Heat sink, 14 ... Mounting board, 31 ... Printed wiring board, 32 ... Mounting leg piece, L ₁ , L ₂ ... Coil, C ... Capacitor.

Claims (1)

[Claim for Utility Model Registration] A transistor is placed between a heat sink and an insulating plate is interposed on one side of the heat sink, and
In the transistor mounting device, a transistor mounting plate is arranged on the other side of the heat sink, and the transistor is mounted to the heat sink by screws communicating from the transistor to the mounting plate, the mounting plate A pair of mounting legs are provided by cutting out a part of the mounting leg, and a printed wiring board with electronic components mounted on one main surface is placed with the side on which the electronic components are not mounted facing the mounting leg. A transistor mounting device which electrically connects a connection terminal of the transistor to an electronic component mounted on the printed wiring board.