JP2951823B2 - Volume control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume control device comprising a rotary variable electric element.

[0002]

2. Description of the Related Art Conventionally, a volume control device rotates an axis of rotation by rotating an operation knob protruding from an operation panel to change the electrical characteristics of a variable electric element and adjust the volume output from a speaker or the like. Was. In addition, a motor is connected to the rotating shaft of the rotary variable electric element, and by adjusting the power supply to the motor, the rotating shaft is rotated to change the electrical characteristics of the variable electric element and output from a speaker or the like. Had been adjusting the volume.

[0003] By the way, electronic equipment having a volume control device configured to adjust the volume by adjusting the power supply to the motor like the latter is controlled so that the volume gradually increases when the power is turned on. Some had a fade-in action.

[0004]

However, in the above-mentioned conventional apparatus, since the operation knob protrudes from the operation panel, it easily touches the operation knob unexpectedly. When the operation knob is rotated by the contact, the rotation amount is increased. The sound volume output from the speaker is adjusted to a sound volume corresponding to. At this time, if the rotation direction of the operation knob is the direction in which the volume is increased, the greater the amount of rotation, the more discomfort is given to the listener and the sudden change in the volume may damage the speaker. was there.

Further, in an electronic device having a fade-in operation, it is difficult to arbitrarily set a volume upper limit at the time of the fade-in operation. Therefore, there has been a problem that the circuit configuration is complicated.

An object of the present invention is to provide a sound volume adjusting device capable of setting a maximum rotation amount of an operation knob to an arbitrary value.

[0007]

According to the present invention, there is provided a volume control device for adjusting the volume by changing the electrical characteristics of a variable electric element by rotating an operation knob, the volume control device having a circular operation hole. An operation panel portion that forms a plurality of recesses at appropriate intervals in the circumferential direction on an inner surface of an outer peripheral portion of the operation hole; And an operation control knob which is always urged by a spring in one direction in the axial direction and has a convex portion which selectively engages with the concave portion by rotation and axial movement. The control knob is inserted through the center of the operation control knob and protrudes outward, and the operation knob is fixed to the outer end of the rotating shaft. The operation control knob is rotated by engagement of the operation knob with the operation control knob. Range Win is provided with a stopper.

[0008]

According to the above construction, by moving the operation control knob in the axial direction and rotating the operation control knob, the protrusion provided on the operation control knob is selectively engaged with the recess provided on the inner surface of the operation panel. Move to any position. Therefore, when the operation knob is rotated by a predetermined amount, further rotation is impossible due to engagement with the stopper.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is an external perspective view showing a volume control device according to one embodiment of the present invention, FIG. 2 is a front sectional view of the volume control device, FIGS. 3 and 4 are cross-sectional views of the volume control device,
FIG. 5 is a block diagram showing an electrical configuration of the volume control device.

In FIGS. 1 to 4, reference numeral 1 denotes an operation panel (operation panel section) having an operation hole 2 formed on a surface thereof.
On the back surface, a plurality of recesses 3 are provided at appropriate intervals in the circumferential direction of the outer peripheral portion of the operation hole 2.

Reference numeral 4 denotes an operation control knob comprising an edge portion 5 formed to have a diameter larger than that of the operation hole 2. The operation control knob 4 is provided on the front surface thereof so as to be freely engageable with the concave portion 3 formed on the rear surface of the operation panel 1. A convex portion 6, a partition frame 7 projecting to the outside of the operation panel 1 along the peripheral edge of the operation hole 2, and a projecting piece 8 (stopper) provided on an inner peripheral edge of the partition frame 7. A shaft hole 9 through which the rotating shaft 13 penetrates is formed.

Reference numeral 10 denotes an operation knob located in the partition frame 7 formed on the operation control knob 4, and a contact piece 11 is provided on the back surface of the operation control knob 4 so as to be in contact with the protruding piece 8 formed on the operation control knob 4. Have been.

Numeral 12 denotes a volume section composed of a rotary variable resistance element, and a rotary shaft 13 for changing its electric characteristics.
Is provided. Reference numeral 14 denotes a rotating shaft 13 provided on the volume unit 12 by power supply from a power supply circuit (not shown).
Is a motor unit for rotating.

The operation control knob 4 is attached with the edge portion 5 located inside the operation panel 1 and pressed against the back surface of the operation panel 1 by a spring 15. The operation knob 10 operates the operation control knob 4. Through the rotary shaft 13.

An index 16 is provided on the operation panel 1 on the front surface at a position corresponding to the concave portion 3 formed on the rear surface, and a projection 8 is provided on a partition frame 7 formed on the operation control panel 4. The pointer 17 is provided on the surface side of the position where is provided. Further, the operation knob 10 is provided with a pointer 18 indicating the volume of the sound on the front side at a position corresponding to the contact piece 11 provided on the back side.

The upper limit setting of the volume of the operation knob 10 in the above configuration will be described.

A partition frame 7 formed on the operation control knob 4
Is pressed against the spring 15 in the axial direction to release the engagement between the concave portion 3 provided on the back surface of the operation panel 1 and the convex portion 6 formed on the operation control knob 4, and the partition frame 7 is left as it is.
Is pressed, the operation control knob 4 is rotated, and the protrusion 8 is moved to an arbitrary position using the pointer 17 provided on the surface of the partition frame 7 as a mark. When the pointer 17 provided on the front surface of the partition frame 7 points to an arbitrary index 16, the pressing of the partition frame 7 is released, and the operation control knob 4 is formed in the concave portion 3 provided on the back surface of the operation panel 1. The projection 6 is engaged.

At this time, if the convex portion 6 formed on the operation control knob 4 does not engage well with the concave portion 3 provided on the back surface of the operation panel 1 even if the pressing of the partition frame 7 is released, A predetermined amount of operation control knob 4 with the pressure released
Is rotated so that the convex portion 6 of the operation control knob 4 is engaged with the concave portion 3 on the back surface of the operation panel 1.

Therefore, after the contact piece 11 provided on the back surface of the operation knob 10 comes into contact with the protruding piece 6 formed on the operation control knob 4, the operation control knob 10 is rotated. 4 is a convex portion 6 formed on the surface
Engages with the concave portion 3 provided on the back surface of the operation panel 1 and is fixed to the operation panel 1, so that the operation knob 10 does not rotate any more. That is, the operation control knob 4
Is the upper limit of the volume of the operation knob 10.

Next, the fade-in operation in the state where the upper limit of the volume is set as described above will be described.

In FIG. 5, reference numeral 21 denotes a motor unit for rotating a rotating shaft of a volume unit (not shown);
Reference numeral 23 denotes a motor driver that supplies power to the control unit 1, and a control unit that controls the motor driver 22 according to the operation state of the operation input unit 24. Further, the control unit 23 controls the infrared sensor 2
The control of the motor driver 22 is also performed by the operation signal from the remote controller 26 received in step 5.

When the power is turned on, the control unit 23 confirms the operation status of the operation input unit, and if an instruction is given to perform a fade-in operation by operating the operation input unit 24, the control unit 23 is operated based on the instruction. Controls the motor driver 22 to supply power to the motor unit 21 for a predetermined time so that the rotating shaft rotates a predetermined amount in a direction in which the sound volume increases.

If the upper limit of the volume is set before the predetermined time elapses, that is, at a position before the rotation shaft rotates by a predetermined amount, and the rotation shaft is regulated so as not to rotate any more, the rotation shaft will slip. The mechanism prevents rotation beyond the set position regardless of the time of power supply. Therefore, the volume does not increase more than the volume corresponding to the set position.

[0024]

As described above, according to the present invention, the rotary shaft of the variable electric element is inserted through the center of the operation control knob and protrudes outward, and the rotation of the operation knob fixed to the outer end of the rotary shaft is achieved. By restricting the range to an arbitrary value with the stopper provided on the operation control knob, the maximum rotation amount of the operation knob can be set, so the maximum rotation set by the operation control knob when the volume increases due to unexpected contact with the operation knob If the volume does not exceed the volume corresponding to the volume and the maximum rotation of the operation knob is set appropriately, the listener will not feel discomfort due to the volume increase, and the speaker may be damaged due to a sudden change in volume. Can be prevented.

Further, by restricting the rotation range of the operation knob to an arbitrary value, in an electronic device having a fade-in operation, the upper limit of the sound volume during the fade-in operation can be easily set to an arbitrary value.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a volume control device according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the volume control device.

FIG. 3 is a cross-sectional view of the volume control device.

FIG. 4 is a cross-sectional view of the volume control device.

FIG. 5 is a block diagram showing an electrical configuration of the volume control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Operation panel 2 Operation hole 3 Depression 4 Operation control knob 5 Edge part 6 Convex part 7 Partition frame 8 Projection piece 9 Shaft hole 10 Operation knob 11 Contact piece 12 Volume part 13 Rotary shaft 14 Motor part 15 Spring

Claims (1)

(57) [Claims] 1. A volume control device for adjusting a sound by changing an electric characteristic of a variable electric element by rotating an operation knob, comprising: a circular operation hole; An operation panel portion that forms a plurality of recesses at appropriate intervals in the circumferential direction, and is inserted through the inside of the operation panel portion into the operation hole so as to be rotatable and movable in the axial direction, and in one direction in the axial direction. An operation restricting knob which is always urged by a spring and has a convex portion which is selectively engaged with the concave portion by rotation and axial movement, wherein the rotating shaft of the variable electric element is arranged at the center of the operation restricting knob. The operation knob is fixed to the outer end of the rotating shaft, and a stopper for restricting the rotation range of the operation knob by engaging the operation knob is provided on the operation control knob. Volume control apparatus, characterized in that the.