JPH021955Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a dial display device for a radio receiver that displays the frequency of a broadcast signal being tuned.

(b) Prior art In a radio receiver, means for displaying the frequency of the broadcast signal being received is, for example,
It is stated in the No. To further explain this based on FIG.
A rope 7 is suspended in a loop shape through a large number of pulleys 6, 6, . . .
will be established. By turning the tuning knob 4, the rope 7 is moved, and the rotary shaft 2 of the tuning variable capacitor 1 is rotated to perform tuning, and the pointer 8 is moved on the scale plate. , the frequency of the broadcast signal being received at that time can be determined from the position of the pointer 8.

(c) Problems to be solved by the invention However, since the above method requires a large number of pulleys 6, 6, etc. and a loop must be formed,
It took up space. Furthermore, since the rotary shaft 2 of the variable channel selection capacitor 1 and the pointer 8 are moved by the same rope 7, the pointer is moved so that the frequency of the broadcast signal being tuned by the variable channel selection capacitor 1 is displayed correctly. It took some time to align the 8, and sometimes the rope broke.

The present invention provides a dial display device for a radio receiver that eliminates such drawbacks.

(d) Means for solving the problem The dial display device of the radio receiver of the present invention includes a shaft member rotated by a knob, a variable capacitor for channel selection whose rotating shaft is interlocked with the shaft member, It is composed of a flexible wire having one end connected to a pointer that can be slid on a scale plate, and the other end fixed to the shaft member.

(E) Function The dial display device of the radio receiver of the present invention has the above-described configuration, so that when the knob is rotated, the rotating shaft of the variable channel selection capacitor is rotated through the shaft member to select a channel. At the same time, one end of the flexible wire is wound around the shaft member and the flexible wire is moved, so that the pointer also slides on the scale plate to display the frequency being selected.

(F) Embodiment The dial display device for a radio receiver of the present invention will be explained below with reference to FIG. This is a variable capacitor, and a wire guide 12 is provided on a rotating shaft 11. Reference numeral 13 denotes a channel selection device, which includes a case 16 screwed onto the chassis 14 with screws 15, a wire winding portion 17, and a screw portion 18, and a knob 19.
The shaft member 20 is rotated by a shaft member 20, and a screw member 21 passes through the case 16 and is screwed into the threaded portion 18. A flexible wire 22 is movable within the tube 23, one end of which is fixed to the wire guide 12, and the other end of which is attached to the screw member 2.
It is fixed at 1. 24 is also tube 25
It is a flexible wire that can be moved inside, and one end is connected to a pointer 27 that is slidable on a scale plate 26, and the other end is attached to a winding portion 17 of the shaft member 20 so as to be wound. ing.

For example, if steel is used for the flexible wires 22 and 24, when the knob 19 is turned and the flexible wires 22 and 24 are unwound from the winding section 17, the needle 27 or the variable capacitor 10 for channel selection is moved by its own rigidity. Although the rotating shaft 11 can be pushed back, a return spring may be provided on the pointer 27 or the rotating shaft 11 as necessary.

The dial display device for a radio receiver according to the present invention has the above-described configuration. When the operator wishes to listen to a predetermined broadcast signal, the knob 19 is turned clockwise, and the shaft member 20 is also rotated clockwise. Then, the screw member 2 screwed into the screw portion 18 of the shaft member 20
1 is moved in the direction of arrow A, the screw member 21
The flexible wire 22, one end of which is fixed, is pulled and moved through the tube 23, rotating the rotating shaft 11 together with the wire guide 12, and changing the capacitance value of the variable channel selection capacitor 10. When the capacitance of the variable channel selection capacitor 10 reaches a certain value, the antenna tuning circuit is tuned to the frequency of a broadcast signal, so that the broadcast signal is received, amplified, and then added to the mixing circuit. At this time, the frequency of the local oscillation signal of the local oscillation circuit is made to be the difference between the frequency of the received broadcast signal and the intermediate frequency by the capacitance of the variable capacitor 10 for tuning. The applied broadcast signal is converted into an intermediate frequency signal, which is then detected, amplified, etc., and drives a speaker.

By the way, when the knob 19 is turned to rotate the shaft member 20, the flexible wire 24 wound around the winding section 17 is unwound, so the flexible wire 24 moves in the direction of arrow B and moves the pointer 27 to the dial scale plate. Move on 26. Therefore, the position of the pointer 27 at that time is determined by the dial scale plate 26.
By reading the frequency of the broadcast signal being received, it is possible to know the frequency of the broadcast signal being received. In this case, the movement of the flexible wire 24 due to being unwound from the winding portion 17 is greater than the movement of the flexible wire 22 due to the screw member 21, so the movement of the pointer 27 is expanded.

When the knob 19 is rotated counterclockwise, the screw member 21 moves in the direction opposite to the arrow A, and the rotary shaft 11 of the variable channel selection capacitor 10 is rotated in the opposite direction to select the channel. play a game. Along with this, the flexible wire 24 is now moved to the winding section 17.
Since the needle 27 is wound up and moved in the opposite direction to arrow B, the pointer 27 also moves in the opposite direction and displays the frequency of the received broadcast signal.

(g) Effects of the invention As described above, the dial display device of the radio receiver of the invention has a shaft member that is rotated by a knob and rotates the rotation shaft of a variable condenser for tuning, and a pointer linked with a flexible wire. Therefore, the installation is easy, and since there is no need to form a loop, the installation position of the dial scale plate and the variable capacitor for tuning can be relatively freely selected.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a display device for a radio receiver according to the present invention, and FIG. 2 is a sectional view of a conventional display device for a radio receiver. 10... Variable capacitor for channel selection, 11... Rotating shaft, 17... Winding section, 18... Screw section, 19
... knob, 20 ... shaft member, 21 ... screw member,
22... Flexible wire, 24... Flexible wire, 26... Dial display board, 27
...Guidelines.

Claims (1)

[Scope of utility model registration request] A rotary shaft of a variable condenser for tuning is linked to a shaft member rotated by a knob, and the other end of a flexible wire, to which a pointer is connected to one end to be slid on a scale plate, is fixed to the shaft member. The device is characterized in that, by rotating the knob, the rotary shaft of the variable channel selection capacitor is rotated to select a channel, and a pointer is slid through a flexible wire to display the frequency at which the channel selection is being performed. Radio receiver dial display device.