JPS6115635Y2 - - Google Patents

Description

[Detailed description of the invention] This invention uses an operating shaft whose one end is rotatably supported by a partition plate that partitions the oscillation circuit section.
Regarding the UHF tuner, the present invention provides a UHF tuner that has a simple structure and can reduce unnecessary radiation levels.

First, a conventional UHF tuner will be explained with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 1 denotes a tuner chassis. Electric elements such as a variable capacitor constituting a tuning circuit are housed within this chassis 1, and a gear 3 is fixed to a rotor shaft 2 of the variable capacitor. An L-shaped bracket 4 is fixed to the chassis 1, and an operating shaft 6 is rotatably supported by the bracket 4 and the front plate 5 of the chassis 1, and a collar 7 is attached to the operating shaft 6. The collar 7 is formed integrally with a pinion 8 that is integrally provided at the center of the pinion 8 that is rotatably supported by the bracket 4.
The friction plate 9 is press-fitted between the two friction plates 9a and 9b, and by rotating the operating shaft 6, the friction plate 9 is frictionally applied from the collar 7.
The pinion 8 is rotated at a reduced speed together with a and 9b.

A gear body 10 is rotatably mounted on the operating shaft 6, and a large-diameter gear 10a of the gear body 10 is meshed with one gear 8a of the pinion 8. A small-diameter gear 10b located in the chassis 1 through 5 meshes with the gear 3 fixed to the rotor shaft 2.

Therefore, by rotating the operating shaft 6, the friction plates 9a, 9b, the pinion 8, and the gear body 1 are removed from the collar 7.
0, the rotor shaft 2 is rotated at a reduced speed through the gear 3,
Synchronization is achieved.

On the other hand, an indicator shaft 11 is supported on the operating shaft 6 by a bearing 12 of a bracket 4 so as to rotate coaxially and independently of the operating shaft, and a gear 13 fixed to the tip of the bracket 4 is connected to the indicator shaft 11. The indicator shaft 11 is meshed with the other gear 8b of the pinion 8, and when the pinion 8 is rotated, the indicator shaft 11 is rotated via this gear 13, and the channel is displayed.

In addition, in FIG. 1, 14 is a partition plate,
An oscillation circuit is incorporated in the section 15 partitioned by the partition plate 14. Figure 2 is shown in Figure 1.
The figure shows a bearing that rotatably supports the tuner side end of the operating shaft 6 of the UHF tuner, and the end of the operating shaft 6 rotates on a container-shaped bearing 16 fixed to the partition plate 14 by soldering or the like. freely supported.

However, in the conventional UHF tuner described above, the oscillation power of the oscillation circuit configured in the section 15 flows on the surface of the partition plate 14 and reaches the operating shaft 6, and as a result, the fifth As shown in a in the figure, there was a drawback that the level of unnecessary radiation was high.

The present invention eliminates the above-mentioned conventional drawbacks, and the same parts as in FIGS. 1 and 2 are given the same numbers and will be explained in conjunction with FIGS. 3 and 4.

As is clear from Figures 3 and 4, this invention
The UHF tuner has an insulator 17 attached to the end of an operating shaft 6, and the end of the operating shaft 6 is rotatably supported by a bearing 16.

As described above, in the UHF tuner of the present invention, since the insulator 17 is interposed between the partition plate 14 and the operating shaft 6, it has the advantage of reducing the unnecessary radiation level as shown in FIG. 5B.

Although the above embodiment has a structure in which a cylindrical insulator 17 is fitted to the end of the operating shaft 6, a container-shaped insulator may also be fitted, or the bearing 16 may be formed of an insulator. It is a good thing.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional UHF tuner, Figure 2 is a perspective view of a conventional UHF tuner.
3 is a top view of a UHF tuner according to an embodiment of the present invention, FIG. 4 is an enlarged sectional view of the same essential part, and FIG. 5 is an unnecessary radiation level characteristic diagram. DESCRIPTION OF SYMBOLS 1... Chassis, 6... Operation shaft, 14... Partition plate, 15... Oscillation circuit section, 16... Bearing, 17... Insulator.

Claims (1)

[Scope of utility model registration request] In a UHF tuner that uses an operating shaft with one end rotatably supported by a partition plate that partitions an oscillation circuit section, an insulator is attached to one end of the operating shaft, and a bearing attached to the partition plate is connected via the insulator. A UHF tuner that supports the above operating shaft.