JPS6141301Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuned display device, and more particularly to a tuned display device that is compact and capable of precise display.

A tuning display device that has been widely used in radio receivers has a structure in which the rotation of a dial knob is transmitted to a dial pointer via a dial string, and this pointer is moved along a dial scale plate. In this type of structure, it is necessary to provide a long scale plate, and a mechanism for moving the pointer must be provided on the back of this scale plate, which has the disadvantage of occupying a large space. Ta. Therefore, it has been impossible to include such a device in a pocket-sized radio receiver. As a synchronization display device with a compact structure, there is one in which a scale number or a pointer is engraved on the rotary knob and a pointer or scale number is displayed on the cabinet.
The drawback is that the display becomes less precise and the product value decreases.

The present invention was devised in view of these problems.The rotary knob for synchronization operation and the display drum are arranged coaxially, and these are arranged in a pair of openings arranged adjacent to the cabinet. An intermediate pulley is arranged between the thread threading shaft of the rotary knob and the variable compensator pulley so that the knob and the drum face each other. and a gear provided on the shaft of the intermediate pulley is meshed with a gear of the display drum, so that the rotation of the rotary operation knob is decelerated and transmitted to the display drum. The present invention relates to a characteristic tuned display device. Therefore, it is possible to provide a device that is compact and capable of precise display.

An embodiment in which the present invention is applied to a small FM radio receiver will be described below with reference to the drawings. As shown in FIG. 1, a cabinet 1 of this radio receiver has a flat rectangular parallelepiped shape, and its side wall 2 has a cylindrical curved surface. A pair of openings 3 and 4 are formed in this side wall 2. The opening 3 is covered with a transparent plate 5 to form a transparent window. Inside this opening 3 is a display drum 6.
are arranged. Further, a rotary knob 7 is disposed inside the opening 4, and a portion of its peripheral surface is exposed to the outside through the opening 4.

As shown in FIGS. 2 and 3, the rotation knob 7 is fixed to a support shaft 8, and is configured to rotate together with the support shaft 8. The support shaft 8 is rotatably supported by a chassis 9 fixed to the cabinet 1. A small diameter portion at one end of this support shaft 8 constitutes a threading shaft portion 10.
The support shaft 8 extends through the chassis 9 to the other end, and rotatably supports the display drum 6 at this extended portion 11. As a result, the knob 7 and the drum 6 are arranged coaxially. Furthermore, since the display drum 6 is configured to be rotatable with respect to the support shaft 8, the knob 7 and the display drum 6 are configured to rotate independently of each other.

As shown in FIG. 4, the display drum 6 consists of a cylindrical synthetic resin base 12 and a display cylinder 13 fitted around the outer periphery of the base 12. A pair of slits 14 are cut in the outer cylindrical portion of the base body 12 in the axial direction, thereby forming elastic pieces 15. A convex portion 16 is formed on the outer surface of the elastic piece 15.
Furthermore, a claw 17 is integrally provided at the tip. The convex part 16 is elastically pressed against the display cylinder 13, and the cylinder 13 is rotated together with the base body 12 by the frictional force generated thereby, and the two can be moved relative to each other as necessary. The scale can be calibrated by rotating the scale. Further, the cylinder 13 is prevented from falling off from the base body 12 by a claw 17. Note that an FM frequency scale 18 is formed on the outer peripheral surface of the display cylinder 13.

As shown in FIGS. 2 and 3, a gear 19 is integrally connected to the base 12 of the display drum 6 at one end thereof, and this gear 19 is connected to a gear 20.
It's meshing with. The gear 20 is fixed to one end of the rotating shaft 21. This rotating shaft 21 is rotatably supported by a bearing 22 fixed to the chassis 9, and an intermediate pulley 23 is fixed to the other end. A variable converter 24 is fixedly supported on the chassis 9, and a variable converter pulley 25 is fixed to an operating shaft of the variable converter 24. Further, an arm 26 is integrally extended to the chassis 9, and a guide pulley 27 is rotatably supported at the tip of the arm 26. The dial thread 2 is attached to the thread threading shaft 10, the intermediate pulley 23, the guide pulley 27, and the varicon pulley 25.
8 is being passed.

Therefore, when the rotary knob 7 exposed to the outside of the cabinet 1 through the opening 4 is operated with a finger, this knob 7 is rotated. Incidentally, the outer peripheral surface of this knob 7 is formed with unevenness to prevent fingers from slipping. The rotation of the knob 7 is transmitted to the varicon pulley 25 via the dial thread 28 wound around the threading shaft 10 of the support shaft 8 to which the knob 7 is fixed.
5 rotates, and the capacity of the variable capacitor 24 changes. Therefore, this makes it possible to receive broadcasts in synchronization with the oscillation frequency of a desired broadcast station. Moreover, the rotation of the knob 7 is slowed down mainly by the ratio of the diameters between the threading shaft 10 and the variable compensator pulley 25, thus making it possible to perform precise synchronization operations.

Further, the rotation of the knob 7 is transmitted to the intermediate pulley 23 via the dial thread 28. The rotation of the intermediate pulley 23 is caused by the rotating shaft 21, the gear 20, and the gear 1.
9 to the display drum 6,
This causes the display drum 6 to also rotate. When a predetermined number on the frequency scale 18 on the outer peripheral surface of the display drum 6 coincides with a guide line 29 formed on the transparent plate 5 of the opening 3, the tuning frequency at this time can be determined. Moreover, according to this device, the speed is reduced mainly by the ratio of the diameters between the threading shaft 10 and the intermediate pulley 23, and therefore it is possible to perform accurate synchronization display.

Furthermore, according to this synchronized display device, since the rotary knob 7 and the display drum 6 are arranged coaxially, the drum 6 can be supported by the knob shaft 8, and these knobs 7 and the drum 6 can be ,
They can correspond to a pair of openings 4 and 3 provided adjacent to the cabinet 1, respectively. Therefore, the device can be configured very compactly and has excellent operability.

As described above, according to the present invention, the rotary knob and the display drum are arranged coaxially, and each of these openings faces a pair of adjacent openings, making it compact. Moreover, it is possible to provide a device with excellent operability. Further, since a reduction ratio can be obtained between the threading shaft portion of the knob and the intermediate pulley and the variable compensator pulley, precise synchronized operation and display can be performed.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a small FM radio receiver. Fig. 1 is an external perspective view of this radio receiver, and Fig. 2 is an enlarged view of the tuning display device of this radio receiver. FIG. 3 is a plan view, FIG. 3 is an exploded perspective view, and FIG. 4 is an exploded perspective view of the display drum. In addition, in the symbols used in the drawings, 1...cabinet, 3, 4...opening, 6...display drum,
7...Rotary knob, 10...Shaft for threading, 1
9, 20... Gear, 21... Rotating shaft, 23... Intermediate pulley, 24... Variable capacitor, 25... Variable capacitor pulley, 28... Dial thread.

Claims (1)

[Scope of utility model registration request] A rotary knob for synchronization operation and a display drum are arranged coaxially, and the knobs and the drum are arranged so as to respectively face a pair of openings arranged adjacent to the cabinet. An intermediate pulley is arranged between the shaft for threading and the variable compensator pulley, a dial thread is wound around the shaft for thread hanging, the variable compensator pulley and the intermediate pulley, and the gear provided on the shaft of the intermediate pulley is connected to the gear for the display. A synchronized display device, characterized in that the rotation of the rotary operation knob is meshed with a gear on a drum so that rotation of the knob is decelerated and transmitted to the display drum.