JPH11288642A - Assembly structure of rotary type electric component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To constitute a rotary type electric component using a small number of part items. SOLUTION: A rotor 1 having a movable contact part 13 is rotatably supported in a mounting hole formed in a base 3, and a printed board 2 having a fixed contact part corresponding to the movable contact part 13 is fixed integrally with the base 3 to constitute an electric component such as a rotary switch or variable resistor. The number of part items required and a man-hour for assembly are reduced to reduce manufacturing costs and to enable miniaturization of an entire circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electric component such as a rotary switch or a variable resistor assembled using a printed circuit board on which a predetermined pattern is printed.

[0002]

2. Description of the Related Art When an electric circuit using a printed circuit board includes a changeover switch, a variable resistor, or the like, a single product such as a small switch or a variable resistor is mounted on the printed circuit board and directly connected to a pattern. A structure in which these components are attached to another substrate and connected via a harness, a connector, or the like is general. However, with such a structure, it is difficult to reduce the size of the entire unit in which the electric circuit is housed, and the number of required parts and the number of assembling steps are increased, and erroneous assembly of parts having different specifications is prevented. Therefore, there is a problem that a countermeasure is required to increase costs.

[0003]

SUMMARY OF THE INVENTION The present invention focuses on these points and reduces the number of parts and the number of assembly steps when an electric circuit using a printed circuit board includes a rotary operation type electric part. The object of the present invention is to enable miniaturization and the like.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, in the assembly structure of a rotary operation type electric component according to the present invention,
A rotor having a movable contact portion is rotatably supported in a mounting hole formed in the base, and a fixed contact portion corresponding to the movable contact portion is integrally fixed to the base with a printed board formed by a printing pattern. In addition, an electric component that performs predetermined functions such as adjustment and switching by rotating the rotor is configured.

In the above structure, a shaft is protruded from the tip of the rotor, a holding hole is formed in the printed circuit board corresponding to the shaft, and the shaft is inserted into the holding hole to rotatably hold the shaft. I am trying to do it.

The present invention can be applied to, for example, a rotary switch or a variable resistor which is a rotary operation type electric component.

[0007]

Embodiments of the present invention will be described below. 1 is a sectional view of a main part in an assembled state, FIG. 2 is a front view and a side view of a rotor, FIG. 3 is a view showing an example of a printed pattern on a printed circuit board, FIG. 4 is a plan view of a base, and FIG. FIGS. 6 and 7 are exploded cross-sectional views of the entire circuit unit, FIGS. 6 and 7 are perspective views showing the procedure for assembling the unit, FIG. 8 is a cross-sectional view of the unit, FIG. FIG. 4 is a diagram showing an example of a print pattern of FIG.
This embodiment is an example of a circuit unit for a control panel of an automobile. In each figure, 1 is a rotor, 2 is a printed circuit board, 3 is a base, 4 is a back cover, 5 is a front cover, 6 is a knob, 7 Indicates a circuit unit in which these members are assembled. In this specification, “up” and “down” are based on the direction in FIG.

As shown in FIG. 2, the rotor 1 is provided with an operating shaft 11 at a lower end and a flange-like end plate 12 at an upper end. The upper surface of the end plate 12 is made of a highly elastic metal plate. The movable contact portion 13 is attached, and a shaft portion 14 projects upward at the center, and an insertion portion 15 is formed between the operation shaft 11 and the end face plate 12. Reference numeral 16 denotes a click mechanism, and 17 denotes a locking recess for fixing the knob.

A printed circuit board 2 is provided with printed patterns for forming a predetermined circuit on both sides and mounted with necessary components (not shown) such as semiconductors. The fixed contact portion 21 is formed at a predetermined position by a printing pattern corresponding to the movable contact portion 13 of FIG. 1, and is connected to the pattern on the opposite surface by, for example, a through hole. The fixed contact portion 21 is a portion where the movable contact portion 13 slides after assembling, and includes a ring-shaped common electrode 21a and a plurality of individual electrodes 21b concentrically arranged with respect to the pattern 21a. I have. At the center of the fixed contact portion 21, a holding hole 22 into which the shaft portion 14 of the rotor 1 is inserted is provided.

The base 3 has a shape as shown in FIGS. 4 and 5, and has a mounting hole 31 at a predetermined position where the rotor 1 is mounted, for inserting the rotor 1 and rotatably supporting the same. A plurality of vertical grooves 3 are formed on the inner peripheral surface of the mounting hole 31.
The spring 18 shown in FIG. 6 is inserted into the hole 16 a of the click mechanism 16 of the rotor 1, and the urging force causes the ball 19 to abut against the inner peripheral surface of the mounting hole 31. A click operation is performed at the position of the groove 32. Note that the vertical groove 32 is not shown in FIG.

When assembling, first, the rotor 1 is inserted and supported in each of the mounting holes 31 of the base 3, the printed circuit board 2 is placed thereon, and the shaft 14 of the rotor 1 is held in the holding hole 22.
Insert Then cover the back cover 4 as shown in FIG.
The back cover 4 and the printed circuit board 2 are fastened together by the screws 41 and fixed integrally to the base 3.

Next, the front cover 5 is arranged on the lower surface of the base 3, and the knob 6 is fixed to the operation shaft 11 of the rotor 1. The knob 6 has a locking claw 6 corresponding to the locking recess 17 of the operation shaft 11.
The knob 6 is fixed to the operation shaft 11 by pushing the knob 6 to a position where the locking claw 61 engages with the locking recess 17, and the front cover 5 is pressed by the knob 6 to prevent it from falling out. It is attached to the base 3 in a state where it has been done. For example, a display as shown in FIG. 9 is provided on the lower surface of the front cover 5, that is, the side that becomes the front when used. Above,
The assembly of the circuit unit 7 is basically completed, except for the detailed work required in the actual assembly.

After being assembled in this manner, the rotor 1
The contact piece 13a inside the movable contact portion 13 is a fixed contact portion 2
In this state, the outer contact piece 13b comes into contact with the individual electrode 21b, and the rotor 1 and the printed circuit board 2 form a rotary switch. Therefore, by rotating the rotor 1, the movable contact portion 13
Slides on the common electrode 21a and the plurality of individual electrodes 21b, and the individual electrodes 21b in contact with the common electrode 21a are sequentially switched.

Here, the individual electrodes 21 of each fixed contact portion 21
Needless to say, the number of b, the position of the partition, and the position of the vertical groove 32 formed in the mounting hole 31 of the base 3 are selected according to the circuit to be switched. Circuit switching is performed with a click operation at each predetermined angle. Grease is applied to the inner peripheral surface of the mounting hole 31 in which the vertical groove 32 for the click operation is formed in order to improve operation feeling and reduce operation noise. Since the gap G is provided between the edge and the printed circuit board 2 as shown in FIG. 1, the printed circuit board 2 and the mounting hole 31 come into contact with each other so that grease adheres to or penetrates the fixed contact portion 21. The grease does not cause any trouble in the contact state.

Although the above is an example in which the rotor 1 and the printed circuit board 2 constitute a rotary switch, a variable resistor may be constructed with a similar structure. in this case,
For example, as shown in FIG. 10, a resistor electrode 21c formed by a printed pattern using a resistor may be provided in a portion corresponding to the individual electrode 21b, thereby forming a variable resistor. The position where the portion 13 contacts the resistor electrode 21c changes, and the resistance value between the common electrode 21a and both ends of the resistor electrode 21c changes. Although the printed circuit board 2 shown in FIG. 3 is an example having three rotary switches, a part or all of the fixed contact portions 21 are variable depending on the circuit and provided with the above-described resistor electrodes 21c. It can be replaced with a resistor.

In general, when a plurality of rotary switches, variable resistors, and the like are used, the specifications of these electric components are usually different, and it is necessary to prepare a plurality of types of electric components according to the specifications. is there. On the other hand, in the present invention, it is only necessary to change the specification of the fixed contact portion 21 of the printed board 2, and the rotor 1 having the same specification can be used in principle. Therefore, the number of electrical components to be prepared is reduced, and the number of components is reduced because harnesses and connectors are not required, so that mistakes such as mistakenly assembling another rotor do not occur. Is unnecessary, and since it is only necessary to arrange a plurality of rotors 1 on the base 3 and assemble them, there are advantages such as easy assembling and a reduction in required man-hours, and it is possible to reduce manufacturing costs.

In addition, the size, especially the thickness, of the entire circuit unit can be easily reduced as compared with the case where a single part is used, so that the circuit unit can be reduced in size. Factors can be reduced and reliability can be easily improved. The present invention is not limited to a circuit unit for a control panel of an automobile, but can be applied to various electric circuits. However, as described above, the shaft portion of the rotor 1 is formed in the holding hole 22 of the printed circuit board 2. By inserting the rotor 14 and holding the rotor 1 in a two-sided structure, the reliability of the circuit unit 7 used in an environment with a lot of vibration, such as an automobile, can be improved.

[0018]

As apparent from the above description, the present invention rotatably supports a rotor having a movable contact portion in a mounting hole formed in a base, and has a fixed contact portion corresponding to the movable contact portion. By integrally fixing the printed circuit board having the above structure to the base, a rotary operation type electric component is constituted.

Accordingly, the required number of parts and the number of assembly steps are reduced, the size of the entire circuit unit in which the electric circuit is housed is reduced, and no measures are required to prevent erroneous assembly of the parts. The effect makes it possible to reduce the manufacturing cost.

Further, when the shaft protruding from the tip of the rotor is inserted and held in the holding hole of the printed circuit board, the rotor can be held in a two-sided structure, so that it can be used in an environment with a lot of vibration. Reliability is improved.

Further, by applying the present invention to a rotary switch or a variable resistor, the above-described effects can be obtained in assembling these components.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part in an assembled state according to an embodiment of the present invention.

FIG. 2 is a front view and a side view of the rotor in the same.

FIG. 3 is a diagram showing an example of a pattern of a printed circuit board in the above.

FIG. 4 is a plan view of the base in the above.

FIG. 5 is an exploded sectional view of the entire circuit unit in the same.

FIG. 6 is a perspective view showing an assembly procedure of the circuit unit.

FIG. 7 is a perspective view showing an assembly procedure of the circuit unit.

FIG. 8 is a sectional view of the circuit unit.

FIG. 9 is a diagram showing an example of display of the circuit unit.

FIG. 10 is a diagram showing an example of another pattern of a printed circuit board in the circuit unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor 2 Printed circuit board 3 Base 4 Back cover 5 Front cover 6 Knob 7 Circuit unit 13 Movable contact part 14 Shaft part 21 Fixed contact part 22 Holding hole 31 Mounting hole 32 Vertical groove

Claims (4)

[Claims] A rotatable rotor having a movable contact portion in a mounting hole formed in the base; and a printed circuit board in which a fixed contact portion corresponding to the movable contact portion is formed by a printing pattern. A rotary operation type electric component, wherein the electric component performs a predetermined function by rotating the rotor. 2. A shaft is protruded from the tip of the rotor,
2. The assembly structure according to claim 1, wherein a holding hole is formed in the printed circuit board corresponding to the shaft portion, and the shaft portion is inserted into the holding hole and rotatably held. 3. The assembly structure of a rotary operation type electric component according to claim 1, wherein the electric component is a rotary switch. 4. The structure for assembling a rotary operation type electric component according to claim 1, wherein the electric component is a variable resistor.