JPS6315691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tuning device for a radio receiver, and more particularly to an improvement in a tuning device for a radio receiver for a car.

Conventional car radio receivers are configured so that the desired broadcast can be selected by selectively pushing in multiple tuning buttons, and presetting can be performed by pulling out the tuning button and then pushing it in. has been done. That is, the channel selection operation and the preset operation can be performed by operating the channel selection buttons in different directions.

However, the operation of pulling out the selection button is more troublesome than the operation of pushing it in, and it also takes more time to preset, so you can select or preset by simply pushing the selection button. It is desirable to be able to do this as well. However, in this case, unless there is a difference in the channel selection operation and preset operation, the two cannot be distinguished, which is a problem.

Therefore, the present invention solves these technical problems, and allows you to select a channel simply by pressing the channel selection button.
The two preset operations, as well as the preset operation and its release operation, are distinguished so that they can be performed without error even in a dark place, and moreover, circuit switching can be performed reliably.

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

FIG. 1 shows the front side of the radio receiver of this embodiment, where 1 is the case body of the radio receiver, and 2 is the front side of the radio receiver.
A digital display section that displays the distinction between FM and AM as well as the tuning frequency. 3 is a tuning button that changes the tuning frequency. When this button 3 is rotated by pressing the right end with the center part (indicated by the dotted line) as a pivot, The frequency automatically and continuously increases, and when the left end is pressed and rotated, the frequency automatically and continuously decreases. Reference numeral 4 indicates channel selection buttons, and in this embodiment, five channel selection buttons numbered 1 to 5 are provided. These channel selection buttons 4 each have a protrusion 5 for preset operation on the upper end of the front surface and a protrusion 6 for channel selection operation on the lower end. It is made larger than that of the protrusion 5 so that it can be distinguished at a glance. Further, as shown in FIG.
is formed so that it slopes toward the front.

Next, the channel selection button 4 and its surrounding structure will be explained using the drawings from FIG. 2 onwards. The channel selection button 4 is rotatably attached to a support member 7 rotatably attached within the case body 1. That is, the support member 7
is rotatably attached to a shaft 8 installed in the case body 1, and the tuning button 4 is rotatably supported by a shaft 10 on a bearing portion 9 provided integrally with this support member 7. There is. This shaft 10 has support pieces 1 protruding from both sides of the central part of the back surface of the channel selection button 4.
1 and 11. The support member 7 is integrally provided with an arm 12 and a locking piece 13 connected to the arm 12 so as to come into contact with the tip 11a of the support piece 11. The locking piece 13 and the tip 11a of the support piece 11 are located at the normal position of the channel selection button 4 (shown in FIG. 2) and the pressed position when the upper end of the channel selection button 4 is pressed and rotated (see FIG. 7). ) and functions as a holding mechanism in both positions. Further, when the channel selection button 4 is in the normal position (see Fig. 2), the direction of the engagement width between the tip 11a of the support piece 11 and the locking piece 13 is the direction of the arm 1.
2, and when in the pressing position (see FIG. 7), the direction of the engagement force between the tip 11a of the support piece 11 and the locking piece 13 is in the direction of the arm 12.
Each member is arranged so as to be approximately at right angles to.

Further, the supporting member 7 is integrally provided with a protruding piece 15 that engages with the upper end of a printed circuit board 14 arranged and fixed behind the channel selection button 4. The support member 7 is biased to rotate so that the piece 15 is engaged with the printed circuit board 14.

As shown in FIG. 5, the front surface of the printed circuit board 14 is provided with a switch pattern 17 for activating a preset circuit and a switch pattern 18 for activating a channel selection circuit. A rubber plate 16 having a concave portion in a portion facing the switch patterns 18 and 17 is adhesively fixed to the front surface of the printed circuit board 14. A movable contact 19 made of conductive rubber is adhesively fixed in the recess of the rubber plate 16, and the protrusion 19 corresponds to the recess on the front surface of the rubber plate 16.
Press a to switch movable contact 19 to switch pattern 17
Alternatively, if the pattern is pressed to 18 and these patterns are short-circuited, a preset circuit or a channel selection circuit is activated. In other words, switch pattern 1
7 and the movable contact 19 facing it constitute a preset circuit activation switch, and the switch pattern 18 and the corresponding movable contact 19 constitute a channel selection circuit activation switch. Note that both the preset circuit and the tuning circuit are for controlling a well-known electronic tuner using a variable capacitance diode or the like.

Switch operation pieces 20 and 21 are integrally provided at the upper end, lower end, and vicinity of the back surface of the channel selection button 4, respectively, to operate the above two switches. It goes without saying that the operation piece 20 is used for presetting, and the operation piece 21 is used for channel selection. Tuning switch operation piece 2
1 includes a stopper portion 2 integrally provided with the support member 7.
2 are engaged by a holding mechanism formed by the locking piece 13 and the tip 11a of the support piece 11, and the channel selection button 4
is held in a position where its front surface is approximately vertical as shown in FIG. Further, the projecting piece 15 of the support member 7 has a shaft 23, and the lever 2 uses the shaft 23 as a pivot point.
4 is rotatably attached.

The operation of the above embodiment will now be explained.

First, when performing a tuning operation, press the lower front end of the tuning button 4, that is, the vicinity of the tuning operation protrusion 6 (see Figure 6). The rubber plate 16 having a concave portion at its center rotates against the elastic force of the protrusion 16a, and the tuning switch operation piece 21 moves the protrusion 16a of the rubber plate 16 in a direction approximately perpendicular to the printed circuit board 14, that is, the tuning switch. The movable electrically conductive rubber contact 19 closes the channel selection switch pattern portion 17 of the printed circuit board 14 in a substantially normal operating direction, and activates the channel selection circuit to select a predetermined broadcasting station.

In this case, when the pressing force on the selection button 4 is released, the rubber plate 1
The channel selection button 4 is automatically returned to its original position as shown in FIG. 2 by the force of the protrusion 16a.

On the other hand, when performing a preset operation, when the upper front end of the channel selection button 4, that is, the vicinity of the preset operation protrusion 5 is pressed, the support member 7 has its protrusion 15 engaged with the printed circuit board 14 (see FIG. 7). The selection button 4 does not rotate due to the fact that it is rotated, but the button 4 rotates around the shaft 10, and the preset switch operation piece 20 of the button 4 kicks the lever 24 attached to the shaft 23 of the protruding piece 15 of the support member 7. The lever 24 presses and moves the protrusion 16a of the rubber plate 16 in a direction substantially perpendicular to the printed circuit board 14, that is, in the normal operating direction of the preset switch. Close the circuit and activate the preset circuit. In this state, by operating the tuning button 3 and selecting an arbitrary broadcasting station, that station is stored as a preset. At this time, the pressing force necessary to press and rotate the upper front end of the channel selection button 4, that is, the preset operation protrusion 5, is such that the direction of the engagement force between the tip 11a of the support piece 11 and the locking piece 13 is on the arm. 12, so it is extremely large. The channel selection button 4 is then connected to the tip 11a of the support piece 11 and the locking piece 13.
It is elastically locked in the pressed position.

To cancel the above preset state, press channel selection button 4.
By pressing near the protrusion 6 for channel selection operation,
The protruding piece 15 of the support member 7 is stopped by the stopper 25 to be released. At this time, the pressing force necessary to press the lower end of the channel selection button 4 and release the preset state is equal to the tip 11a of the support piece.
Since the direction of the engagement force between the locking piece 13 and the locking piece 13 is substantially perpendicular to the arm 12, the force is extremely small.

As explained above, according to the channel selection device for a radio receiver of the present invention, it is possible to distinguish between the two operations of changing the position of the channel selection button and pressing it, and presetting the channel selection. It is possible to press the two types of switches from their normal operating directions, and the switches can be operated reliably. Further, the required pressing force for the preset operation and its release operation can be arbitrarily set to be different, and the preset operation and its release operation can be easily distinguished even in a dark place.

[Brief explanation of the drawing]

Fig. 1 is a front view of a radio receiver according to an embodiment of the present invention, Fig. 2 is a side cross-sectional view showing the tuning section of the radio receiver, Fig. 3 is a rear view of the radio receiver, and Fig. 4 is the main part of the radio receiver. 5 is a front view of the printed circuit board, FIG. 6 is a side view showing the channel selection operation state, and FIG. 7 is a side view showing the preset operation state. 4...Tuition selection button, 5...Protrusion for preset operation,
6... Protrusion for channel selection operation, 7... Support member, 14...
...Printed circuit board, 16...Rubber plate, 17, 18...
...Switch pattern, 19...Movable contact, 20,
21...Switch operation piece, 24...Lever, 25...
...Stotsupa.

Claims (1)

[Claims] 1. In a radio receiver equipped with an electronic tuner, a plurality of tuning buttons are rotatably supported at substantially intermediate positions, and the tuning buttons can be placed in a normal position, a pressed position in which one end is pressed and rotated, and a pressed position in which one end is pressed and rotated. A holding mechanism is provided to hold the tuning button in two positions, and the holding force of the tuning button by the holding mechanism is made different between the normal position and the pressed position, and the tuning button is rotated by pressing one end thereof. When the tuner is turned on, the first operating piece provided on the tuning button presses the first switch for starting the preset circuit in the substantially normal operating direction via a separately provided rotary lever, thereby starting the preset circuit of the electronic tuner. When the other end of the selection button is pressed in this state, the selection button is rotated with a pressing force different from the pressing force when pressing the one end, and is held in the normal position by the holding mechanism. In this state, when the other end of the channel selection button is pressed and rotated, the second operating piece provided on the channel selection button moves the second switch for starting the channel selection circuit in its approximately normal operating direction. 1. A channel selection device for a radio receiver, characterized in that the channel selection circuit of an electronic tuner is activated by pressing .