JPH045255B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a variable capacitor, and more specifically, the capacitance value of a capacitor, the resistance value of a variable resistor, and a switch are turned on and off using a single axis. The present invention relates to a variable capacitor in which a variable resistor and a switch are integrally attached.

[Conventional technology] As a product in which variable capacitors are often used,
For example, there are audio products such as radio receivers and cassette decks with radios. In recent years, these audio products have been made smaller and more densely packed, and there has been a great demand for multifunctionality such as reception of television audio bands. To achieve this multi-functionality, the idea was to integrate a variable resistor into a variable capacitor to achieve high density and multi-functionality.The variable resistor was installed coaxially with the rotor shaft that constitutes the variable capacitor, and the capacitance value A so-called variable capacitor with a variable resistor, which has a configuration in which resistance value change and resistance value change can be varied simultaneously along one axis, has already been commercialized.

[Problem that the invention seeks to solve]

Generally, in radio receivers, cassette decks with radios, etc. in which so-called variable capacitors with resistors are used, the variable capacitors with variable resistors are used in the AM band of radio frequencies.
Used for FM band and VHF band of TV audio frequency,
The configuration is such that a variable resistor is used for the UHF band of TV audio frequencies.

However, in TVs with radio receivers that have recently been commercialized, due to the scale characteristics of the TV and problems with image processing after tuning, reception of the AM band and FM band is handled by a variable capacitor, and the VHF band of the TV audio frequency is handled by a variable capacitor. And the UHF band is made to be handled by a variable resistor. In this way, the variable resistor
When used in the VHF band, since the frequencies between channels 3 and 4 are far apart, 1
Scale characteristics from channel to channel 12,
In order to make the spacing more even, a separate switch or the like is used to switch the tuning voltage and circuit between 3 channels and 4 channels.

However, installing the switch separately requires a drive mechanism that operates the switch synchronously with the variable capacitor with the variable resistor. In addition, the scale plate needs to be accurate enough to switch between channels 3 and 4, and the quality and quality of the variable capacitor with variable resistor and the switch must be adjusted accordingly.
In addition to the variation in accuracy, there was also variation in the drive mechanism, and there was a limit to how much precision could be improved.

Conventional technologies such as those described above have problems such as increasing the density of the product, reducing assembly man-hours, and improving switching accuracy.Furthermore, the need for a switch drive mechanism increases the manufacturing cost of the product. was.

The present invention has been made in view of the problems of the prior art, and its purpose is to be highly versatile,
To provide a variable capacitor equipped with a variable resistor with a switch, which is inexpensive in both product cost and assembly cost.

[Means for solving problems]

Therefore, in the present invention, a slider of a variable resistor and a slider of a switch are attached to a rotor shaft, which is a drive shaft of a variable capacitor, and the capacitance value of the variable capacitor is changed by rotation of the rotor shaft. The resistance value of the variable resistor can be changed, and the switch can be turned on and off.

[Effect]

In the present invention, the rotor shaft of the variable capacitor, the variable resistor, and the drive shaft of the switch are coaxial, and the slider group is assembled to the drive shaft, so that changes in capacitance value, changes in resistance value, and on/off of the switch can be performed on a single axis. This eliminates the need for a drive mechanism to synchronously operate the switch and the variable capacitor with variable resistor in the product, contributing to higher density of the product and reduction of assembly man-hours. The switching accuracy can be improved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. Figures 1 and 2 show a variable capacitor with a variable resistor with a switch (hereinafter abbreviated as a variable capacitor with VR with SW) according to an embodiment of the present invention.
FIG. 1 is an exploded perspective view, and FIG. 2 is a sectional view of main parts.

1 and 2, the variable capacitor with SW and VR is composed of a small variable capacitor 1 using a film (not shown) as a dielectric, a switch 8, and a variable resistor 9. A pair of electrodes 1c and 1d formed on the upper surface of the front substrate 1h of the variable capacitor 1;
1d and a slider receiver 2 equipped with sliders 4a and 4b for electrically connecting the electrodes 1c and 1d, and the variable resistor 9 includes:
A substrate 5, an element 6 on which a resistive layer 6c and a current collecting layer 6d are formed, and sliders 3a and 3b that contact the resistive layer 6c and the current collecting layer 6d, respectively, to conduct them. It consists of a slider receiver 2 that is fixed.

In FIG. 1 of the front board 1h of the variable capacitor 1, a rotor shaft 1b for rotating a rotor plate (not shown) arranged in the variable capacitor 1 and a stator plate (not shown) are shown on the upper side. ), and a plurality of terminals 1a protruding from each stator plate and electrically connected to each stator plate. This rotor shaft 1b and terminal 1
The position of a and the respective intervals are standardized for mounting on audio equipment and connecting to a circuit board (not shown). It is formed to be constant regardless of the number of selected bands.

The electrodes 1c and 1d constituting the switch 8 are formed on the upper surface of the front substrate 1h of the variable capacitor 1 by, for example, insert molding, and the electrode 1d is formed approximately around the rotor shaft 1b of the variable capacitor 1. Formed in a donut shape, the electrode 1c
is formed in a substantially semicircular shape outside the electrode 1d so that the switch 8 is conductive within a predetermined angular range. External output terminals 1e and 1i of the respective electrodes 1c and 1d are connected to the front substrate 1h of the variable capacitor 1.
It is bent approximately vertically at the outer edge 1k of the capacitor 1, and is formed so as to protrude below the variable capacitor 1 in FIG. 1 along the side surface of the variable capacitor 1. Note that 1j is a switch switching position, and 1f is a ground lead.

The slider group 10 includes a slider receiver 2 and projections 2a formed on both sides of the slider receiver 2 to which slider pieces 3 and 4 are attached. Also, mounting hole 3
It has c, 4c. Furthermore, slider pieces 3 and 4 having sliders 3a, 3b, 4a, and 4b for constructing a switch 8 and a variable resistor 9, respectively, are fixed to the slider receiver 2. This slider piece 3, 4
is placed on the slider receiver 2 and then attached by the protrusion 2a of the slider receiver 2. Further, a shaft insertion hole 2b into which the rotor shaft 1b of the variable capacitor 1 is inserted is formed approximately at the center of the slider receiver 2, and the rotor shaft 1b is press-fitted and fixed into the shaft insertion hole 2b. There is.

The element group 11 has a resistance layer 6c on the outside.
It consists of an element 6 each having a current collecting layer 6d formed inside and having four terminals 7, and a substrate 5 in which the element 6 is housed and held.A variable capacitor is installed approximately in the center of the element 6. A shaft insertion hole 6a is formed into which a rotor shaft 1b serving as a drive shaft 1 can be loosely inserted. The base plate 5 has an element mounting part 5c in which the element 6 is held and housed, and the rotor shaft 1 is located in the center of the element mounting part 5c.
A shaft insertion hole 5b into which the terminal 1b of the variable capacitor 1 can be inserted loosely, and a plurality of terminal insertion holes 5a into which the terminals 1a of the variable capacitor 1 can be press-fitted are formed at the outer edge of the shaft insertion hole 5b. The shaft insertion hole 6a of the element 6, the shaft insertion hole 5b of the substrate 5, and the terminal insertion hole 5a are arranged at positions corresponding to the rotor shaft 1b and the terminal 1a of the variable capacitor 1, respectively, and are formed in the element 6. The resistive layer 6c and current collecting layer 6d are held and housed so as to face downward, and the terminal 1a is press-fitted and fixed into the terminal insertion hole 5a.

Therefore, in the variable capacitor of the present invention as described above, the rotor shaft 1b is press-fitted into the shaft insertion hole 2b of the slider receiver 2 on the side where the rotor shaft 1b of the variable capacitor 1 is projected, and the terminal is inserted into the board 5. By press-fitting the terminal 1a into the hole 5a, the variable capacitor 1, switch 8, and variable resistor 9 are integrated. When formed in this way, the variable capacitor 1, switch 8, and variable resistor 9 can be integrated by simply forming the shaft insertion hole 2b in the slider receiver 2 and the terminal insertion hole 5a in the board 5. Since the shaft insertion hole 2b of the slider receiver 2 and the rotor shaft 1b of the variable capacitor 1 have a press-fit structure, the rotor shaft 1b
Due to the rotation of the variable capacitor 1, the rotor plate (not shown) in the variable capacitor 1 and the sliders 3a, 3b, 4a, 4b fixed to the slider receiver 2 rotate in conjunction with each other. It is possible to simultaneously change the capacitance value of the variable capacitor 1, turn on/off the switch 8, and change the resistance value of the variable resistor 9 on the same axis as the rotor shaft 1b.

[Effects of the present invention]

As described above, the switch electrode is formed on the front board of the variable capacitor, the element group of the variable resistor is attached to the terminal of the variable capacitor, and the slider group of the variable resistor is press-fitted into the rotor shaft of the variable capacitor. According to the variable capacitor of the present invention, the capacitance value can be changed, the switch can be turned on/off, and the resistance value can be changed in conjunction with each other by rotating the rotor shaft. There is no need for a drive mechanism to operate the variable capacitor with variable resistor synchronously, and this has the practical effect of increasing product density, reducing assembly man-hours, and improving switch switching accuracy. .

[Brief explanation of drawings]

The drawings all relate to the present invention; FIG. 1 is an exploded perspective view of a variable capacitor with SW and VR, showing one embodiment of the present invention, and FIG. 2 is a sectional view of the essential parts thereof. 1...variable capacitor, 1a, 1g...terminal,
1b...Rotor shaft, 1c, 1d...Electrode, 1e, 1i...External lead-out terminal, 1f...Earth lead, 1h...Front board, 1j...Switch switching position, 2...Slider receiver, 2a...protrusion, 2
b...Shaft insertion hole, 3, 4...Slider piece, 3
a, 3b, 4a, 4b...slider, 3c, 4c...
...Mounting hole, 5... Board, 5a... Terminal insertion hole, 5
b, 6a... Shaft insertion hole, 5c... Element mounting portion, 6... Element, 6b... Terminal mounting hole, 6c... Resistance layer, 6d... Current collecting layer, 7... Terminal, 7a... Protrusion , 8... switch, 9... variable resistor, 10... slider group, 11... element group.

Claims (1)

[Scope of Claims] 1. A variable capacitor whose capacitance value can be changed by rotation of a rotor shaft, in which a slider of a variable resistor and a slider of a switch are attached to the rotor shaft, and A variable capacitor characterized in that the capacitance of the variable capacitor, the resistance value of the variable resistor, and the turning on/off of the switch can be changed by rotating the shaft. 2. In claim 1, an electrode of a switch is formed on the front substrate of the variable capacitor, a group of elements of a variable resistor is attached to a terminal of the variable capacitor, and the rotor shaft connects the variable resistor and the switch. A slider receiver is formed to double as a drive shaft for the drive shaft, and a slider receiver is fixed to the drive shaft to which a slider for changing the resistance value of the variable resistor and a slider for turning the switch on and off are fixed. A variable capacitor characterized by being press-fitted.