KR950002555Y1 - Electric circuit substrate - Google Patents

Abstract

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Description

Circuit board

1 is a longitudinal sectional view of one embodiment of a small direct current motor according to the present invention.

2 is a perspective view of a heat sink and a terminal plate in FIG.

3 is a perspective view of a heat sink and a terminal board attached to a circuit board.

4 is a perspective view of a state in which electronic components are attached to FIG. 3 again.

5 is a longitudinal cross-sectional view of FIG.

6 is a partial perspective view showing the rear end of the motor with the cap of FIG.

Figure 7 is a longitudinal sectional view of another embodiment of a small DC motor according to the present invention.

8 is a partial perspective view of the rear end of the motor of FIG.

9 is a longitudinal sectional view showing an example of a conventional small DC motor.

FIG. 10 is a partial perspective view of the rear end of the motor with the cap of FIG.

Fig. 11 is a longitudinal sectional view showing another structural example of a conventional small DC motor.

12 is a partial perspective view of the rear end of the motor with the cap of FIG.

13 is a perspective view of another embodiment of the heat sink and terminal plate in FIG.

14 is a perspective view of a heat sink and a terminal board attached to a circuit board.

FIG. 15 is a perspective view in which the electronic component is attached to FIG.

FIG. 16 is a partial perspective view of the rear end of the motor of another embodiment with the cap of FIG.

17 is a partial perspective view of the rear end of the motor of FIG. 7;

* Explanation of symbols for main parts of the drawings

1: Circuit board of speed control circuit 2: Control IC (transistor)

3: heat sink and terminal board 4: motor shaft

5: amateur core 6: commutator

7: armature coil 8: motor case

9: magnet 11: bracket

12: metal brush 13: bearing

14: sponge 15: cap

The present invention relates to a compact DC motor incorporating a speed control circuit suitable for driving a capstan such as a cassette tape recorder.

This kind of motor used in a cassette recorder with a radio, a car cassette recorder, or the like is often used in a very wide temperature range with an environmental temperature of -10 ° C to 70 ° C.

In this case, especially in a motor having a low-circuit type built-in motor at a speed such that the speed is kept constant in the electronic circuit, by driving the motor, electric current is supplied to electronic components such as heat generated from the armature coil, a control IC, or a control transistor. Due to the heat generated and the load of the equipment used in the change of operating environment, the current flowing through the armature coil increases, resulting in the increase of heat generated in the armature coil and the increase of the current flowing into the electronic components such as the control IC or the control transistor. Because of the large thermal effect that the speed control system has on account of the increase in the amount of heat generated, the time drift of the rotational speed and the deterioration of the large temperature characteristic of the rotational speed may occur.

FIG. 9 is a longitudinal sectional view illustrating a conventional motor of this type, and FIG. 10 is a partial perspective view of the motor of FIG.

9 and 10, in a small DC motor with a conventional speed control circuit, electronic components 2 such as a control IC or a control transistor are fixed to the circuit board 1 by direct soldering or the like. Since the heat generated by energizing them directly heats the circuit board 1, other electronic components attached to the circuit board 1 are also heated more than necessary, so that the normal phase of the speed control system changes and the rotational speed is changed. Fluctuations in speed may cause the accuracy of the speed control to decrease.

Moreover, since the feed terminal was provided in the lug part 1a which protruded a part of the circuit board 1 radially, the circuit board 1 protrudes from the outer diameter of the motor case 8, Since the outer diameter of the motor is large, there are also problems such as difficulty in attaching to a small apparatus.

FIG. 11 is a longitudinal sectional view showing another structure of the conventional small DC motor, and FIG. 12 is a partial perspective view of the motor of FIG.

11 and 12, the electronic component 2, such as a control IC or a control transistor, which is a part of the heat generating source in the motor, comes out of the motor and comes into close contact with the outer surface of the motor case 8. It is attached to the protrusion part 1a of (1).

In this structure, in order to bring the electronic component 2 into close contact with the motor case 8, it is necessary to form the flat portion 8a in the motor case, which is why the processing of the motor case 8, which is a press-molded product, is necessary. This becomes difficult, and also a problem may arise, such as maintenance of a press die.

Also in this case, the lug portion 1a of the circuit board 1 protrudes more than the outer diameter of the motor, and the outer diameter of the motor is increased so that it is difficult to attach to the small apparatus.

Moreover, since the protrusion 1a of the circuit board 1 becomes relatively large, there also existed a problem that plates, such as a crack, were easy to produce in this protrusion.

A first object of the present invention is to provide an electric circuit board capable of increasing the heat dissipation effect of an electric component such as an integrated circuit structure or a transistor that generates heat.

In addition, the present invention is to install a heat sink for placing the electrical components on the electric circuit board, and to install the power supply terminal integrally on the heat sink, a circuit board that enables heat dissipation and power supply of the electric circuit board To provide.

Another object of the present invention is to provide an electric circuit board to be housed in a cylindrical motor case such as a motor, which is suitable for heat dissipation of the electric component and supply of power from the outside of the motor case. .

In addition, the present invention is to provide an electric circuit board suitable for the assembly of the rapid terminal of the heat sink with the heat dissipation and feed.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 8.

In FIG. 1, 1 denotes a circuit board of a speed control circuit of a motor, 2 denotes a control IC or a control transistor which is a part of an electronic circuit component, and 3 denotes a metal heat sink and terminal plate.

The armature core 5 and the commutator 6 having a laminated structure are fixed to the motor shaft 4 by means of caulking or press fitting, and the armature coil 7 is wound around the armature core 5, and the armature The terminal of the coil is wire soldered to the terminal of the commutator 6.

8 is a motor case, and a magnet 9 opposed to the armature core 5 with an air gap is fixed to the inner circumferential surface of the motor case, and the front center opening of the motor case 8 is fixed to the outer circumference of the arm case. The bearing 10 for shaft-supporting the said motor shaft 4 is being fixed.

The plastic bracket 11 and the end cap 15 are fixed to the rear open surface of the motor case 8.

The bracket 11 is attached with a metal brush 12 in sliding contact with the commutator 6 and a bearing 13 for bearing the rear end of the motor shaft 4.

The component mounting surface of the circuit board 1 is bonded to the outer surface of the bracket 11, and a sponge 14 is disposed between the circuit pattern surface of the circuit board 1 and the inner surface of the cap 15. It is kept in a compressed state.

Each of the metal brushes 12 is attached to each of the sets at opposite positions of 180 degrees, and the terminals for conducting connection are soldered to the circuit pattern surface of the circuit board 1 bonded to the surface opposite to the bracket 11. Is connected.

The sponge 14 is compressed by the cap 15 and pressed onto the circuit pattern surface of the circuit board 1, and absorbs vibration generated in the bracket 11 and the circuit board 1 to reduce the mechanical noise. Have.

The cap 15 is pressed into the motor case 8 and has a function of magnetically shielding the motor to reduce electrical noise.

Thus, in the small DC motor of FIG. 1, the power supply terminals A and B to the motor are provided between the electronic component 2 such as the control IC or the control transistor and the component mounting surface of the circuit board 1. ) (FIG. 2) and the gold heat sink 3 which also served as the grounding terminal C (FIG. 2) are closely_contact | adhered.

That is, the heat dissipation plate and the terminal plate 3 are closely attached to the component mounting surface of the circuit board 1, and the terminals 3B ₁ , B _2, and B ₃ of the heat sink are soldered to the circuit pattern surface of the circuit board 1. The electronic component 2 is soldered to a control IC, a control transistor, or the like.

2 is a perspective view of the heat sink and terminal plate 3.

In FIG. 2, the heat sink and terminal board 3 press-process a brass or an electro-tin plated steel plate, or a metal excellent in heat dissipation effect.

The heat sink 3 includes an electrical component placing portion 3A, engaging portions 3B ₁ , 3B ₂ , 3B _{3 for} engaging the heat sink with the circuit board 1, and feeder terminals 3C ₁ , 3C _2. , 3C ₃ ). The engaging portions 3B ₁ and 3B ₂ are bent at both sides of the placing portion 3A and the other engaging portions 3B ₃ are bent at the free end of the feed terminal portion 3C ₃ .

The feed terminal portion 3C has a predetermined inclination angle with the placing portion 3A for receiving power supply from the outside of the motor case, which will be described later, and the placing portion 3A is superimposed on the circuit board, and the feed terminal portion 3C is It is configured to protrude out of the motor case.

Press work of the heat sink 3 is punched into a shape as shown in FIG. 2 and cut along the line X-X 'as described later.

FIG. 3 shows a state in which the heat sink and the terminal board 3 are attached to the component mounting surface of the circuit board 1, and FIG. 4 is again attached to the electronic component 2 such as a control IC or a control transistor in FIG. It shows what is done.

5 is a cross-sectional view showing the attachment state of FIG.

According to the arrangement of the electrical circuit components in FIG. 3, the heat sink and terminal board ₃ are attached by soldering portions of the engaging portions 3B ₁ , 3B ₂ , 3B ₃ to the circuit pattern surface of the circuit board 1. .

According to FIGS. 4 and 5, an electronic component 2 such as a control IC or a control transistor is formed on the electric circuit placing portion 3A of the heat sink and terminal board 3 attached by soldering to the circuit board 1. It is in close contact, and its terminal portion is attached by soldering to the circuit board surface of the circuit board 1.

In addition, the heat dissipation fin part 2a is provided in the electronic component 2 which consists of a control IC, a control transistor, etc., and this electronic part 2 adhere | attaches the heat dissipation fin part 2a to a part of the heat sink and terminal board 3, It is fixed by soldering, and is attached by soldering the leg portion 2b to the circuit pattern portion of the circuit board 1 by soldering.

As apparent from the shape of the feed terminals 3C ₂ and 3C ₃ of the heat sink and terminal board ₃ shown in FIG. ₂ and the position of the solder connection portions 3B ₃ and 3B _{2 to the} circuit board 1, FIG. Since the shape shown in Fig. 2 does not function as a feed terminal, the end of the feed terminal portion 3C of the heat sink and terminal plate 3 is cut along the X-X 'line shown in FIG. ₃ ) is the positive feed terminal, and terminal 3C ₃ is the negative feed terminal.

Further, the terminal portion 3C ₁ is bent along the line Y-Y 'as indicated by the terminal 3C ₁ in Fig. 6, spot welded to the motor case 8, and the motor case 8 Connect to ground through. The bending state of the ground terminal 3C ₁ and the fixing state of the motor case 8 are as shown in FIG.

In the structure described above with reference to FIGS. 1 to 6, when the feed terminals 3C ₂ and 3C ₃ are energized, heat is generated in the electronic component (such as a control IC or a control transistor) 2, and part of the heat The heat is transferred to the lead of the electronic component 2 and radiated to the circuit board 1, but most of the heat is transferred to the heat sink and terminal plate 3 soldered in close contact with the heat dissipation fins 2a of the electronic component 2, and then to the power supply. The heat is radiated to the motor case 8 through the ground terminal 3C ₁ , which is a common terminal with the terminal 3C ₂ .

Accordingly, the driving conditions are changed, such as an increase in the load on the motor, and the current flowing into the electronic component (control IC or control transistor, etc.) 2 is changed, so that the amount of heat generated by the electronic component 2 is changed. In addition, other electronic components disposed on the circuit board 1 are hardly affected by the change in the amount of heat generated, so that the constant of the speed control system can be stably maintained, which enables high speed control.

7 is a longitudinal cross-sectional view of a small DC motor according to another embodiment of the present invention, and FIG. 8 is a partial perspective view showing the attachment state of the heat sink and the terminal plate 3 of the motor of FIG.

Incidentally, in Figs. 7 and 8, the same numbers as those in these figures are assigned to parts having substantially the same structure and function as in the case of the embodiment structures of Figs.

Claim 7 according to Fig. And 8 also, the power supply terminal of the Motor case forming a recess (15a) on the outer diameter of the end portion and the cap 15 after the 8, and the heat sink President and terminal board (3), (3C _2, 3C ₃ ) is bent upwards to be accommodated in the recess 15a, and the ground terminal 3C ₁ is bent downwards in the same manner as in FIG. 6 to be in close contact with the outer surface of the motor case 8 to be spot welded Is stuck.

The concave portion 15a can be formed regardless of whether the feed terminals 3C ₂ and 3C ₃ are bent.

According to the embodiment of Figs. 7 and 8, the heat sink and terminal plate 3 can also be continued without protruding from the outer diameter of the motor case 8, and the same effects as in the case of Figs. In addition to reducing the outer diameter of the motor, the assembly and attachment to a small device can be made easier, and the heat sink and terminal plate 3 can be prevented from being damaged by the ideal force applied as an external factor. Could.

According to the present invention, since the power supply terminal is integrally provided on the heat sink, heat dissipation and power supply of the electric component can be performed in a single component.

In addition, the circuit board according to the present invention has a configuration in which the power supply terminal portion 3C has a predetermined inclination angle with respect to the heat dissipation portion 3A for heat dissipation of electrical components. The case was able to derive only the power supply terminals on the outside. In addition, the engaging portions 3B ₁ , 3B ₂ and the feed terminals 3C ₂ , 3C ₃ , which engage the heat sink 3 to the circuit board 1 on the heat sink used for the circuit board of the present invention, are a single member. Therefore, by retaining the engaging portions 3B and 3B _{2 in} the pattern of the circuit board 1, the holding of the heat sink and the connection of the power supply could be easily performed.

The heat sink 3 'includes an electrical component placing part 3A', engaging portions 3B ' ₁ , 3B' ₂ , 3B ' _{3 which} engage the heat sink with the circuit board 1, and a feed terminal part ( 3C ' ₁ , 3C' ₂ , 3C ' ₃ ). The engaging portions 3B ' ₁ and 3B' ₂ are bent at both sides of the mounting portion 3A ', and the other engaging portions 3B' ₃ are folded at the free end of the feed terminal portion 3C ' ₂ . Bend over and stand.

The feed terminal portion 3C 'has a predetermined inclination angle with the tooth portion 3A' for receiving power supply from the outside of the motor case, which will be described later, and the placement portion 3A 'is superimposed on the circuit board and the feed terminal portion 3C. ') Is configured to protrude out of the motor case.

The single press work of the heat sink 3 'is punched into the shape shown in Fig. 13 and cut along the line X-X' as described later.

FIG. 14 shows a state in which a heat sink and a terminal board 3 'are attached to the component mounting surface of the circuit board 1, and FIG. 15 shows an electronic component 2 such as a control IC or a control transistor in FIG. Show attached state.

According to the layout of the electric circuit component of FIG. 14, the heat sink and the terminal board 3 'are provided with the portions of the engaging portions 3B' ₁ , 3B ' ₂ and 3B' _{3 on} the circuit pattern surface of the circuit board 1. It is attached by soldering.

According to FIG. 15 and FIG. 5, the electronic component 2, such as a control IC or a control transistor, is mounted on the electric circuit mounting part 3A of the heat sink and terminal board 3 attached to the circuit board 1 by soldering. In close contact with each other, the terminal portion thereof is attached to the circuit board surface of the circuit board 1 by soldering.

In addition, a heat dissipation fin portion 2a is provided in an electronic component 2 made of a control IC or a control transistor, and the electronic component 2 is soldered by bringing the heat dissipation fin portion 2a into close contact with a part of the heat sink and terminal plate 3. And the leg portion 2b is electrically connected to the circuit pattern portion of the circuit board 1 by soldering.

Obvious in the shape of the feed terminals 3C ' ₂ and 3C' _{3 of} the heat sink and terminal board 3 'shown in FIG. 13 and the positions of the solder connection portions 3B' ₃ and 3B ' _{2 to the} circuit board 1; Similarly, since the shape shown in FIG. 13 does not function as a feed terminal, the front end of the feed terminal portion 3C 'of the heat sink and terminal plate 3' is cut and cut in accordance with X-X 'shown in FIG. Separate the terminal 3C ' ₃ from the positive feed terminal and the terminal 3C' ₂ from the negative feed terminal.

Further, the terminal portion 3C ' ₁ is bent along the Y-Y' line as shown by the terminal 3C ' ₁ in FIG. 16, spot welded to the motor case 8, and the motor case ( Ground connection is made through 8). The bending and fixing state of the ground terminal 3C ' ₁ to the motor case 8 are as shown in FIG.

In the embodiment structure described with reference to FIGS. 1 to 13 to 16, the power supply terminals 3C ' ₂ and 3C' ₃ are energized and heat is applied to the electronic component (control IC or control transistor, etc.) 2. Part of this heat is transferred to the leads of the electronic component 2 and radiated to the circuit board 1, but most of the heat is closely connected to the heat dissipation fins 2a of the electronic component 2 and the heat sink and terminal board 3 is soldered. ), And radiated to the motor case 8 through the ground terminal C, which is a common terminal with the feed terminal B again.

Therefore, even if the driving conditions such as an increase in the load applied to the motor change, and the current flowing into the electronic component (control IC or control transistor, etc.) 2 changes, the amount of heat generated by the electronic component 2 changes accordingly. The other electronic components disposed on the circuit board 1 are hardly affected by the change in the heat generation amount, and thus the speed control with high precision can be performed because the constant of the speed control system can be stably maintained.

FIG. 17 is a partial perspective view showing the attachment state of the motor heat sink and terminal plate 3 'of FIG.

Also in Figs. 7 and 17, parts having substantially the same configuration and function as those in the embodiment structures of Figs. 1 and 13 to 16 are given the same numbers as those in these figures. have.

7 and 17, recesses 15a are formed in the rear end of the motor case 8 and the outer diameter of the cap 15, and the feed terminal 3C ' ₂ of the heat sink and terminal plate 3' is formed. , 3C ' ₃ ) is bent upwards and stored in the recess 15a, and the ground terminal 3C' is bent downwards as in the sixteenth case to be in close contact with the outer surface of the motor case 8 to spot welding. Stuck in the back

The concave portion 15a may be formed with or without bending of the feed terminals 3C ' ₂ and 3C' ₃ .

According to the embodiment of FIGS. 7 and 17, the heat sink and terminal plate 3 can also be continued without protruding from the outer diameter of the motor case 8, and the case of FIGS. Not only can the same effect be obtained, but the outer diameter of the motor can be made smaller, thereby making it easier to assemble and attach to a small device. Moreover, the heat sink and terminal plate 3 may be damaged by the ideal force applied as an external factor. Can be eliminated.

Although the circuit board of the present invention has been described as an embodiment of the circuit board of the control circuit of the motor, it can also be applied to electric equipment other than the motor.

Claims (3)

A circuit board having a circuit pattern embedded in a case of an electric device and having a circuit pattern for constituting an electric circuit by electrically connecting an electric component to one side, and a terminal and an electric component having a feeding part and a grounding part for feeding the electric circuit. And a heat dissipation plate having a mounting portion on which the heat dissipation part is mounted, and a heat dissipation plate having a fastening part for connecting to a circuit pattern of the circuit board, and fixing the heat dissipation plate in close contact with a surface opposite to the circuit pattern side of the circuit board. Connects the feeder to an external feeder, mounts a heat generating portion (part of the electrical component) of the electrical component on the mounting portion of the heat sink, and through the through hole formed in the electrical substrate on the mounting portion. Connected to an electric circuit, fixing the engaging portion of the heat sink to a circuit pattern of the circuit board, and dissipating heat generated from an electric component Electrical equipment characterized in that the heat radiation to the plate. The electric machine as set forth in claim 1, wherein a part of said feeder part of said heat sink is configured to protrude at least from a case of said electric machine, and said protrusion part is in contact with the surface of said case. The electrical device of claim 1, wherein the electrical component has a heat dissipation fin and a circuit terminal, and the heat dissipation fin is in close contact with the heat dissipation plate to fix the solder, and the circuit terminal solders the circuit pattern of the circuit board.