JPH0215403Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a frequency display device for a radio receiver, and particularly to the simplification of its pointer moving mechanism.

[Conventional technology]

A frequency display unit that indicates the frequency scale of a radio receiver with a pointer may have a structure in which one end of a thread that moves the pointer is wound around a tuning shaft, and the other end is connected to a fixed point via a helical spring. many. In this case, conventionally, as shown in FIG. 3, the end 4 of the spring 3 is engaged with a special tongue piece 2 cut and raised from the holder 1.

[Problem that the invention attempts to solve]

However, since the tongue piece 2 is flat, the spring 3
A recess 5 is provided to prevent the end 4 from separating.
Even so, since the tip of the tongue piece 2 is open, the detachment prevention function is not sufficient. Also, there is a cut-and-raised cut-out 8 for fixing the printed circuit board 6 with screws 7 nearby, but if the dedicated tongue piece 2 and cut-and-raised 8 are installed in this way, the degree of freedom in design is increased. In particular, the printed circuit board 6 requires an escape pattern to avoid the tongue piece 2, and the holder 1
The disadvantage is that the strength decreases due to cutting and raising.

The present invention attempts to solve the above-mentioned drawbacks by using the cut-and-raised part 8 for mounting the printed circuit board also for engaging the spring 3.

[Means for solving problems]

The present invention is a frequency display device for a radio receiver in which one end of a pointer driving thread is wound around a tuning shaft and the other end is connected to a fixed point via a spring, and a holder for attaching the tuning shaft and laying the thread. A feature is that a cut-and-raised part for mounting a printed circuit board cut and raised from a part of the spring is used as a fixing point of the spring.

[Effect]

If the end of the spring connected to the thread for driving the pointer is engaged with the cut-and-raised part for attaching the printed circuit board, there is no need to cut and raise a dedicated engagement tongue piece from the holder. This increases the strength of the holder and increases the degree of freedom in printed circuit design. Moreover, since the cut and bent tip for attaching the printed circuit board comes into close contact with the printed circuit board, detachment of the spring end is reliably prevented.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 3 are given the same reference numerals. In this example, unlike FIG. 3, a special tongue piece is not provided for engaging the end of the spring 3, but instead, a cut-and-raised piece 8 for attaching a printed circuit board is also used. 9 is a screw hole for mounting a printed circuit board, and 10 is a screw through hole of the board 6. The tip of the cut and raised portion 8 is bent at a right angle in order to make close contact with the printed circuit board 6. Although the end portion 4 of the spring 3 is simply bent into a U-shape, if the printed circuit board 6 is screwed to the cut-and-raised portion 8, it will not be able to be removed. Incidentally, in order to further ensure that the spring end portion 4 is prevented from coming off, a recess 11 may be formed in a part of the cut and raised portion 8 as shown in FIG.

Figure 4 shows a specific example of a car radio receiver to which the present invention is applied, in which a is an assembled perspective view, b is a plan view, and c
is a front view of the holder alone, and d is a front view of the printed circuit board alone. The holder 1 is made of metal, has a cut-and-raised part 8 formed in its vertical part, and a tuner 20 in its horizontal part.
will be installed. 21 is the tuning axis, Tuner 2
0 is connected by an Oldham joint 22. 23
is a thread for driving the pointer, one end of which is wound around the tuning shaft 21, and the other end connected to the cut-and-raised part 8 via the spring 3. 24 is a threading protection member having recesses 25 for reducing friction at the front and rear, and 28 is a boss thereof.
Further, 26 is a threading boss at the turning point. 30
is a pointer fixed to a part of the thread 23 and slides on the back plate 31. 32 is an electric component such as a slide volume. Reference numeral 33 denotes another screw for mounting the printed circuit board, which is screwed into the screw hole 27 of the threading boss 26 through the through hole (or notch) 34.
In addition to this printed circuit board 6, there is an LED for display.
35 and a lamp 36 for illumination are mounted. 40 is a front decorative plate, which has a transparent display plate 42 on which a frequency scale 41 is printed. 43 is a through hole of the tuning shaft 21.

[Effect of idea]

As described above, according to the present invention, the configuration of the pointer moving mechanism used in the frequency display section of a radio receiver can be simplified, the degree of freedom in designing the holder and printed circuit board can be increased, and the strength of the holder can be increased. be able to. Further, there is an advantage that the printed circuit board prevents the spring end connected to one end of the pointer moving thread from coming off.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing an embodiment of the present invention;
Fig. 2 is a perspective view showing a modification thereof, Fig. 3 is a perspective view showing an example of a conventional mounting structure, and Figs. 4 a to d.
FIG. 1 is a configuration diagram showing a specific example of the present invention. In the figure, 1 is a holder, 3 is a spring, 6 is a printed circuit board, 7 is a screw, 8 is a cut-out, 21 is a tuning shaft, 23
30 is a pointer driving thread, 41 is a frequency scale.

Claims (1)

[Scope of utility model registration request] In a frequency display device for a radio receiver in which one end of a pointer driving thread is wound around a tuning shaft and the other end is connected to a fixed point via a spring, from a part of the holder to which the tuning shaft is attached and the thread is laid. 1. A frequency display device for a radio receiver, characterized in that a cut-and-raised cut-and-raised part for mounting a printed circuit board is used as a fixing point of the spring.