JPH0441638Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is applicable to radio receivers, tape recorders,
It also relates to various other electrical equipment.

[Summary of the idea]

In the present invention, a cutout portion is formed in a gear attached to a rotating shaft of a variable electric element having a soldered terminal so as to correspond to the terminal of the variable electric element, so that the terminal Although the variable electric element can be arranged relatively close to the center of the gear and the whole can be made compact, the attachment position of the variable electric element is adjusted while the gear is attached to the rotating shaft. The terminals of the variable electric element can then be soldered.

[Conventional technology]

Recently, ultra-thin radio receivers have become commercially available, and in such radio receivers, for example, a variable electric capacitor (variable capacitor), etc. After fixing the element with screws and soldering the terminals of this variable capacitor to the terminal board provided on the board, fix the tuning gear to the rotating shaft of the variable capacitor with screws so that the teeth of this tuning gear mesh with the teeth of the gear of the tuning dial. I try to let them do it. The capacity of the variable capacitor is adjusted by transmitting the rotation of the tuning dial to the rotating shaft of the variable capacitor via the tuning gear.

[Problem that the invention attempts to solve]

However, when the variable capacitor, tuning gear, and tuning dial are assembled in a specific state as described above, due to the dimensional tolerances of these parts, for example, the distance between the center of the variable capacitor and the center of the tuning dial becomes Because it varies,
The meshing state between the teeth of the tuning gear and the gear of the tuning dial may become poor. That is, if the distance is smaller than a predetermined value, it becomes difficult for the tuning dial to rotate and smooth rotation is difficult, and if the distance is larger than a predetermined value, the tuning dial becomes difficult to rotate. This causes backlash between the turning dial and the tuning dial, making it difficult to rotate smoothly.

[Means for solving problems]

The present invention was developed to solve these problems, and includes a variable electric element such as a variable capacitor or a variable resistor having soldered terminals,
An electrical device each comprising a gear attached to the rotating shaft of the variable electric element, and a cutout, such as a notch or opening, formed in the gear at a position corresponding to the terminal of the variable electric element. This is related to.

〔Example〕

An embodiment in which the present invention is applied to an ultra-thin radio receiver will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention, and in these FIGS. 1 and 2, the ultra-thin radio receiver 1 is a case with a total thickness of about several millimeters. 2 and a back cover 3 is fixed with screws 27. The back cover 3 is made up of a metal plate 4 and a printed circuit board 5 attached to the metal plate 4 so as to be partially overlapped with the inner surface of the metal plate 4. A wiring pattern 16 is formed on this printed circuit board 5, as well as a volume dial 6, a tuning dial 7, a bar antenna 9,
A variable capacitor 12 and various other necessary parts 26 are installed.

The variable capacitor 12 includes a frame 20 in the shape of a flat rectangular parallelepiped. Approximately triangular mounting ears 13 are protruded from both sides of the frame 20, and circular screw insertion holes 34 are formed in these mounting ears 13. The inner diameters of these screw insertion holes are somewhat larger than the outer diameters of the shaft portions of the screws 25 inserted through these holes, so that they are so-called blind holes. Furthermore, a terminal support plate 14 on which four terminals 15 are supported is protruded from the lower part of the frame 20. Further, a substantially oval-shaped engagement portion 19 is formed at the tip of the rotating shaft 18 of the variable capacitor 12, and this engagement portion 19 engages with an engagement opening 21 of approximately the same shape formed in the center of the tuning gear 10. are doing. The tuning gear 10 is fixed to the variable capacitor 12 while maintaining the above-mentioned engagement by a hexagonal screw 24 screwed into a screw hole formed in the rotating shaft 18.

A notch 23 is provided in a part of the outer periphery of the tuning gear 10, and a cut-and-raised piece 31 is formed in another part of the outer periphery so as to be adjacent to the notch 23. Further, tooth portions 10a are formed around the entire outer circumference of the tuning gear 10, excluding the notch 23 and the cut-and-raised piece 31. Note that the cutouts 23 are formed at positions corresponding to the four terminals 15 and their peripheries. Furthermore, openings 22 are formed in the tuning gear 10 so as to correspond to the screw insertion holes 34 in which the pair of mounting ears 13 of the frame body 20 are formed.

A gear 8 protruding in the axial direction (upward in FIG. 1) is integrally formed on the tuning dial 7, and teeth 8a are formed around the entire outer circumference of the gear 8. has been done.

Next, a procedure for assembling the variable capacitor 12, tuning gear 10, tuning dial 7, etc. configured as described above will be explained.

First, attach the tuning dial 7 to the mounting plate 11.
is rotatably supported by a support shaft 36. The mounting plate 11 is fixed to the metal plate 4 by screws 32 and 33, connecting the printed circuit board 5 with the screws 32 and 33.

Next, the variable capacitor 12 is temporarily fixed to the mounting plate 11 with screws 25. In this case, since the screw 25 is screwed into the mounting plate 11 only halfway, the variable capacitor 12 can be moved back and forth and left and right within the gap between the screw insertion hole 34 and the shaft of the screw 25. At this time, the terminals 15 of the variable capacitor 12 are in contact with the terminal plate portion 17 formed on the wiring pattern 16 of the printed circuit board 5.

Next, the tuning gear 10 is screwed and fixed to the variable capacitor 12 using a hexagonal screw 24. Then, the position of the tuning gear 10 is adjusted until the tooth portion 10a of the tuning gear 10 and the tooth portion 8a of the gear 8 of the tuning dial 7 are in good meshing condition. In this case, since the tuning gear 10 is screwed and fixed to the variable capacitor 12, the position of the variable capacitor 12 moves back and forth and left and right within the range of the above-mentioned gap.

Next, a screwdriver bit or the like is inserted through the opening 22 of the tuning gear 10 to the head of the screw 25, and the screw 25 is completely tightened and fixed. As a result, the variable capacitor 12 is completely screwed and fixed to the mounting plate 11. Therefore, it is possible to solder the terminals 15 and the terminal plate portion 17 by inserting a soldering iron or the like through the notch 23 of the tuning gear 10 to the contact point between the terminal 15 and the terminal plate portion 17. In this case, terminal 15
The tip is bent so that it stands upright, so
The above soldering is extremely easy, and the solder paste is also good.

In the assembled state as described above, the clockwise rotation of the tuning gear 10 in FIG.
This is regulated by the cut and raised piece 31 of the tuning gear 10 coming into contact with the tuning gear 9. Further, the rotation in the reverse direction is performed by using the bent piece 30 formed on the mounting plate 11.
This is regulated by the cut and raised piece 31 of the tuning gear 10 coming into contact with this.

The present invention has been described above with reference to its embodiments, but
Various changes and modifications can be made to the embodiments described above without departing from the technical idea of the present invention.
For example, in the above-described embodiment, the cutout formed in the tuning gear 10 can be changed from the notch 23 to an opening having substantially the same shape by appropriately changing the positional relationship between the terminal 15 and the tuning gear 10. I can do it. Further, in the above-described embodiment, the screw insertion holes 34 of the mounting ears 13 of the frame body 20 are
The entire inner diameter of the screw 25 is made slightly larger than the outer diameter of the shaft of the screw 25 to make it circular, but the shape of the hole 34 is similar to the center of the variable capacitor 12 and the tuning dial 7.
It may have any shape that allows adjustment of the distance between it and the center of the hole, for example, it may be a long hole.

[Effects of the invention] As described above, according to the invention, a gear attached to a rotating shaft of a variable electric element having a soldered terminal is provided with a gear corresponding to the terminal of the variable electric element. Since a cutout is formed in the gear, the terminal can be placed relatively close to the center of the gear, and the entire gear can be made compact. After adjusting the mounting position of the variable electric element while it is attached to the shaft, the terminals of the variable electric element can be soldered. Furthermore, since only a cutout is formed in the gear, the structure is extremely simple and therefore extremely practical.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to an ultra-thin radio receiver. Fig. 1 is an exploded perspective view of the main parts, and Fig. 2 shows the case and back cover separated. FIG. 1 is a schematic perspective view of the entire ultra-thin radio receiver. In addition, in the symbols used in the drawings, 1... Radio receiver, 10... Tuning gear, 12... Variable capacitor (variable electric element), 15... Terminal, 18...
... Rotating shaft, 23 ... Notch (cutout part).

Claims (1)

[Claims for Utility Model Registration] A variable electric element having a soldered terminal, a gear attached to a rotating shaft of the variable electric element, and a gear attached to the gear at a position corresponding to the terminal of the variable electric element. and a cutout portion formed therein.