JPH0614510Y2 - Tuning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tuning device such as a liquid crystal display type small television receiver and a radio receiver.

[Technical background of the device and its problems]

Conventionally, as a tuning device for a liquid crystal display type small television receiver, a radio receiver, etc., generally, a pulley attached to a tuning operation knob that is manually rotated, and a pulley attached to a rotating shaft of a tuning variable capacitor, The endless tuning yarn is wound around a plurality of guide pulleys arranged in a predetermined arrangement, and the tuning yarn is driven and driven by the rotation of the operation knob to rotate the rotary shaft of the variable condenser. A thread hooking system is adopted in which tuning guides are attached to tuning threads and the tuning guides are moved together with the tuning threads.

However, the above thread-hanging type tuning device
Since a considerable space is required to wind the tuning yarn, not only the arrangement of other parts is restricted, but also the work of winding the tuning yarn around each pulley is very troublesome, Also, since the tuning thread must be tensioned with an appropriate amount of tension, it is not possible to assemble the tuning device with good workability, and the tuning thread is misaligned due to expansion and contraction of the tuning thread or slip between the pulley and the tuning thread. There was also a problem that the position of the tuning guide might go wrong.

[Purpose of device]

The present invention was made in consideration of the above-mentioned circumstances, and the purpose thereof is to reduce the installation space, to make the assembly easy with good workability, and to dislocate the tuning guide. It is to provide a tuning device that does not have the risk of being lost.

[Outline of device]

That is, the tuning device of the present invention has a tuning operation knob, a worm that is rotated by the rotation of the operation knob, a worm wheel that meshes with the worm, and a worm wheel that is attached to the worm wheel and that is mounted on the rotary shaft of the tuning variable capacitor. A gear that meshes with the attached gear to rotate the rotary shaft of the tuning variable capacitor, a gear that meshes with the worm and is sent in the axial direction by the rotation of the worm, the operating knob and the worm. And one worm supporting member for rotatably supporting the worm wheel and for supporting the tuning guide member so as to be slidable in the axial direction, the conventional tuning device. As shown in, the gear meshes with the tuning thread without using the tuning thread. By tuning the rotating shaft of the variable capacitor for tuning and feeding the tuning guide member, the entire tuning device can be compactly assembled, and the tuning device can be assembled simply by arranging the parts by engaging the gears. In order to prevent the position of the tuning pointer member from shifting, by further driving the tuning pointer member by engaging the worm with the worm and driving it by rotation of the worm, the operation knob, the worm, and the worm The arrangement space for the worm wheel and the tuning guide member can be reduced.

[Example of device]

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of a liquid crystal display type small television receiver using the tuning device of the present invention. This liquid crystal display type small television receiver is a receiver main body 1
Is provided with a reflection plate 2 on the upper surface thereof, and a dot matrix display type transmissive liquid crystal display panel (not shown) is provided on a display unit 3 pivotally supported at the rear end of the receiver main body 1 so as to be openable and closable. The opening is received by the liquid crystal display panel,
By reflecting the display image on the reflection plate 2,
A television image is displayed on the screen of the two reflecting plates. Incidentally, 3a is a daylighting window provided on the upper surface of the display unit 3, and 4 is a rod antenna.

This television receiver can also be used as a radio receiver, and a tuning display window 5 is provided on the upper surface of the operation panel portion 1a formed on the front end side of the receiver body 1 and a power switch. A television-radio switching knob 6, which also serves as a VHF-UHF switching knob 7, and an FM-A
An M switching knob 8 is provided, and a part of an audio volume adjusting knob 9 is projected on the front surface of the operation panel portion 1a.

Further, 10 is a tuning operation knob, a part of which is projected on the upper surface of one side of the operation panel portion 1a.
The tuning device provided inside is operated by turning the tuning operation knob 10.

FIG. 2 shows the configuration of the tuning device.
Reference numeral 11 in the drawing denotes a frame, and the operation knob 10 is rotatably fitted to a support shaft 12 provided at one end of the frame 11. Reference numeral 13 is a retaining washer of the tuning operation knob 10, and this washer 13 is fixed to the tip of the spindle 12 by a set screw 14.

Reference numeral 15 denotes a pair of bearings 1 provided at both ends of the frame 11.
A worm having a predetermined length, which is rotatably supported at its both ends by 6, 16 and is provided in parallel with the tuning display window 5 shown in FIG. 1, this worm 15 has a gear 17 attached to one end thereof. Is engaged with an inner ring gear 18 formed on the tuning operation knob 10 and is rotated by the rotation of the operation knob 10.

Further, 19 is a worm wheel in which a shaft portion 19a is fitted into a bearing 20 provided at the center of one side portion of the frame 11 and rotatably supported by the frame 11, and the worm wheel 19 includes the worm wheel 15 The worm 15 is engaged with and is rotated by the rotation of the worm 15.

On the other hand, 21 is a circuit board arranged below the frame 11, 22 and 23 are variable capacitors for tuning for television and radio (hereinafter abbreviated as variable capacitors),
Reference numerals 22a and 23a denote gears attached to the rotary shafts of the respective variable capacitors 22 and 23.The variable condenser 22 for television and the variable condenser 23 for radio are the circuit board 21 in a state where the gears 22a and 23a are meshed with each other. Is attached to the bottom surface of.

Then, one of the television variable condenser 22 and the radio variable condenser 23, for example, the gear 22a of the television variable condenser 22 has the worm that is projected below the circuit board through a hole portion 21a formed in the circuit board 21. It is also meshed with the variable condenser drive gear 24 fitted and fixed to the shaft portion 19a of the wheel 19, and this television variable condenser 22 is driven to rotate the gear 22a by the variable condenser drive gear 24 which rotates integrally with the worm wheel 19. While operating, the gear 22a of the television variable condenser 22 also transmits rotation to the gear 23a of the radio variable condenser 23 meshing with the gear 22a so that the radio variable condenser 23 is also activated at the same time.
In addition, 25 is a variable wheel drive gear 24 is a worm wheel
A set screw for fixing to the shaft portion 19a of 19.

Further, reference numeral 26 is a tuning guide member having a tuning guide 26a formed on the top surface, which is visible from the tuning display window 5 shown in FIG. 1, and the tuning guide member 26 has a groove 26b provided on the bottom surface thereof. A guide rail 27 protruding parallel to the tuning display window 5 and the worm 15 is slidably fitted on the upper surface of the frame 11, and a worm meshing tooth portion 26c formed on one side of the guide rail 27 meshes with the worm 15. The worm 15 is installed in such a state that it is guided by the guide rail 27 by the rotation of the worm 15 and is fed in the worm axial direction.

In this tuning device, as described above, the variable condenser drive gear 24 is attached to the worm wheel 19 meshed with the worm 15 rotated by the rotation of the tuning operation knob 10, and the variable condenser drive gear 24 is used for the television. Gear 22a mounted on the rotary shaft of variable condenser 22
And the gear 22a of the television variable condenser 22 is also meshed with the gear 23a attached to the rotary shaft of the radio variable condenser 23, thereby making the operation knob 10
The rotation of the variable condenser for television 22 via the gear system
And to transmit to the gears 22a, 23a of the radio variable condenser 23 to rotate the rotary shafts of these variable condensers 22, 23, and to engage the worm 15 with the tuning pointer member 26 having the tuning pointer 26a. Since this tuning guide member 26 is adapted to be fed in the axial direction by the rotation of the worm 15,
Unlike the conventional tuning device, it is possible to use the gear mesh to move the rotary shafts and rotations of the variable capacitors 22 and 23 for television and radio and to feed the tuning needle member 26 without using tuning threads. Therefore, the entire tuning device can be compactly assembled to reduce the installation space. In addition, since this tuning device can be assembled simply by arranging the parts with the gears meshed with each other, there is no need to circulate the tuning thread or adjust the tension as in the conventional tuning device. Therefore, it can be easily assembled with good workability. Moreover, in this tuning device, the tuning guide member
Since 26 is engaged with the worm 15 and is driven by the rotation of the worm 15, the tuning yarn is displaced due to expansion and contraction of the tuning yarn and slippage between the pulley and the tuning yarn as in the conventional tuning device, and tuning is selected. The position of the pointer does not go wrong.

In addition, in the above-mentioned embodiment, the one provided with the two tuning capacitors 22 and 23 for the television and the radio is shown. However, this invention is a tuning for a television receiver provided with only the variable capacitor for the television. Of course, it can be applied to a device or a tuning device for radio reception recording provided with only a variable condenser for radio.

[Effect of device]

According to the tuning device of the present invention, the tuning device can be assembled simply by arranging the tuning operation knob, the worm, the worm wheel, the tuning guide member, and the like by engaging the gears with each other. It can be easily assembled, and since the tuning guide member is meshed with the worm and driven by the rotation of the worm, the position of the tuning guide member can be prevented from shifting and one frame is supported. Since the arrangement of the operation knob, worm, worm wheel, and tuning guide member on the members is made small, the entire tuning device can be made compact.

[Brief description of drawings]

FIG. 1 is an external view of a liquid crystal display type small television receiver using the tuning device of the present invention, and FIG. 2 is an exploded perspective view of the tuning device showing an embodiment of the present invention. 10 …… Tuning operation knob, 11 …… Frame, 15…
… Warm, 19 …… Warm wheel, 21 …… Circuit board, 22 …… Varicon for television, 22a …… Gear, 23
…… Radio variable condenser, 23a …… Gear, 24 …… Varicon drive gear, 26 …… Tuning guide member, 26a …… Tuning guide, 27
...... Guide rail.

Claims (1)

[Scope of utility model registration request] 1. A tuning operation knob, a worm which is rotated by rotation of the operation knob, a worm wheel which meshes with the worm, and a worm wheel which is attached to the worm wheel and a rotary shaft of a tuning valable condenser. A gear that meshes with a gear to rotate the rotary shaft of the tuning variable capacitor, a tuning guide member that meshes with the worm and is fed in the axial direction by the rotation of the worm, the operating knob, the worm, and the worm. A tuning device comprising: a frame supporting member that rotatably supports a wheel and a tuning guide member that slidably supports in the axial direction.