JPS6349943Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a car radio using a mechanical preset tuner, and more particularly to a pointer driving method.

In recent years, in-vehicle audio equipment has become more sophisticated and diversified, and in addition to the car radio, it is necessary to install a cassette deck, graphic equalizer, power amplifier, etc., so car radios in particular are required to be thinner, smaller, and lighter. It's starting to be done. Therefore, attempts have been made to meet this demand by using electronic tuning methods. However, although the electronic tuning method can achieve thinness and weight reduction, the cost tends to be very high, and therefore, if you try to reduce the cost even a little, it becomes inconvenient to perform manual tuning. There are disadvantages in that the dial indicator becomes rough or the reception performance has to be sacrificed.

On the other hand, car radios that use mechanical push-button preset tuners,
Since the dial scale is provided above the pushbutton, the thickness of the car radio inevitably becomes quite thick, which has the disadvantage that it cannot be made thinner or smaller.

The purpose of this invention is to eliminate the above-mentioned drawbacks of the conventional technology, and reduce costs without sacrificing operation or performance by installing a dial scale next to the preset tuner and driving the pointer with a thread. The purpose of the present invention is to provide a car radio that can be made thinner, smaller, and lighter.

In order to achieve this objective, the present invention includes a core slider to which a plurality of cores are attached that move in and out of the μ tuning coil, and a preset tuner that is provided so as to rotate as the core slider moves. A swinging arm, a pointer disposed on the side of the preset tuner, a sliding shaft that slidably supports the pointer, and the pointer is always biased in a direction where the frequency of the preset tuner is high. The arm member and the pointer are connected by a thread.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The main body 1 of the preset tuner is provided with a core slider 2 to which a plurality of cores (not shown) that move in and out of the μ tuning coil are attached, and the core slider 2 can obtain a core stroke of about 10 mm. It is guided so that it can move freely in the front and back directions.
In addition, it is always biased by a spring or the like toward the side where the push button 3 is disposed, that is, the direction in which the core comes out, and the higher frequency side. The core slider 2 is connected to the push button 3, and a screw shaft 4 with a thread groove cut on its outer periphery is inserted into the screw shaft 4.
A piece 5 operatively connected to the core slider 2 is screwed together.

When one of the push buttons 3 is pushed, the push button 3 is locked in the pressed position, and the screw shaft 4 connected to the push button 3 is locked.
moves in the front-back direction, and the core slider 2 is pressed against a spring or the like by a piece 5 screwed onto the screw shaft 4, and moved to a predetermined position.

Furthermore, when the pushbutton 3 is rotated, the screw shaft 4 also rotates, and the piece 5 screwed onto the screw shaft 4 moves in the front and back direction, so it is necessary to align the piece 5 to the desired position in advance. Therefore, when the push button 3 is pressed, the core slider 2 can be moved to a desired predetermined position.

Furthermore, when it is desired to move the core slider 2 to a different position, the push button 3 can be rotated while being pressed in to make the desired adjustment.

A substantially L-shaped pointer arm 6 consisting of a short axis arm 6a and a long axis arm 6b is attached to the upper surface of tuner body 1 so as to be rotatable around a fulcrum 6C. is connected to the core slider 2. The length ratio of the short axis arm 6a and the long axis arm 6b of the pointer arm 6 is set to approximately 5:1, and when the core slider 2 connected to the short axis arm 6a moves by 10 mm, as shown in the figure, As shown by the broken line, the amount of movement of the tip of the long axis arm 6b is expanded to approximately 50 mm, and the direction of movement is also changed from the front and back direction of the core slider 2.
The pointer arm 6 is adapted to be converted in the left and right direction.

A dial driving thread 7 is connected to the tip of the long axis arm 6b of the pointer arm 6, and the dial driving thread 7 is connected to the pointer located on the side of the preset tuner main body 1 via guide rollers 8 and 9. connected to 10. pointer 10
is guided so as to be movable in the horizontal direction in the figure on a guide shaft 11, and is always urged toward the higher frequency side by a spring 12. That is, since the pointer 10 is biased toward the higher frequency side in the same direction as the direction in which the core slider 2 is biased, when the load of the spring 12 biasing the pointer 10 affects the core slider 2, for,
Since the frequency is superimposed on the higher side, the core slider 2 will not be adversely affected by frequency deviation.

FIG. 3 shows an external view of a thin car radio equipped with the above-mentioned pointer drive device. In addition, 13 is
The dial display section 14 indicates the on/off switch button of the car radio.

FIG. 4 shows another embodiment of the present invention, in which the dial scale section is disposed on the right side of the preset tuner in the figure. This embodiment is substantially the same as the first embodiment, except that the components of the pointer drive device are oriented in the opposite direction to those of the first embodiment, and there is no member corresponding to the guide roller 9. Also in this embodiment, the pointer 10
The spring 12 that biases the core slider 2 is set to have a higher frequency that coincides with the biasing side of the core slider 2, and the same effects as in the first embodiment can be achieved.

In the embodiment, the spring 12 is configured as a compression spring attached to the guide shaft 11, but it may also be configured as a tension spring that acts to pull the pointer 10 toward the higher frequency side.

As described above, in the embodiment, the pointer 10
is biased in one direction by the spring 12,
There is no backlash of the pointer 10, and the movement of the core slider 2 can be followed well.

Furthermore, since the pointer drive section has only a limited volume in the front surface of the tuner side, the required space can be made as small as possible.

As explained above, according to the present invention, the swing arm is provided on the preset tuner so as to respond to the core slider, and the elastic member provided on the side of the preset tuner constantly maintains the preset state. By connecting the tuner with a pointer that is energized in the direction of high frequency, the structure is simplified and costs can be significantly reduced.In addition, the vertical thickness can be minimized, making the entire device thinner. It has advantages such as being able to easily achieve thinness and compactness.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing the main parts of a car radio according to an embodiment of the present invention, and FIG.
FIG. 3 is an external front view of the car radio according to the present invention, and FIG. 4 is a plan view showing essential parts of the car radio according to another embodiment of the present invention. 2... Core slider, 6... Pointer arm, 7
...Dial drive thread, 10...Pointer, 11...Guide shaft, 12...Spring.

Claims (1)

[Scope of utility model registration request] A core slider to which a plurality of cores are attached that move in and out of the μ tuning coil, a swinging arm provided on a preset tuner so as to rotate as the core slider moves, and a side of the preset tuner. The arm member is composed of a pointer disposed on the arm member, a sliding shaft that slidably supports the pointer, and an elastic member that always biases the pointer in a direction in which the frequency of the preset tuner is higher. and the pointer are connected by a thread.