JPH0236271Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention [Industrial field of application] Radio receivers are becoming smaller and lighter, from the size of a notebook to the size of a card. For this purpose, the variable capacitor (abbreviated as variable capacitor in this book), which is one of its constituent elements, must also be ultra-thin.

This invention relates to a variable capacitor that meets the above requirements.

[Conventional technology]

The conventional structure of a small variable capacitor is that the stator plate is inserted into the pillars provided at the four corners of the board, the rotor plate is fitted to the rotor shaft supported in the center of the board, and an insulating film is interposed between the rotor and stator plates. It is common practice to fix the holding plate and bearing member to the pillar, surround it with an insulating case, and attach a gear or pulley to the rotor shaft on the outer surface of the board (see, for example, Japanese Utility Model Publication No. 58-26520). .

[Problem that the invention attempts to solve]

Conventional products have a separate structure for the circuit board, capacitor body, holding plate, case, and gear, so it was very difficult to construct them into an ultra-thin design suitable for integration into the card-sized receiver mentioned above. Ta.

The purpose of this invention is to change the above-mentioned conventional structural concept to achieve an ultra-thin design.

B. Structure of the invention [Means for solving the problem] A gear 1 having teeth formed around a thin insulating plate, a plurality of rotor plates 2 ₁ , 2 ₂ , an insulating film 3 ₁ ,
3 ₂ are applied to both end faces with washers 4 ₁ , 4 ₂ and integrally joined with the rivet shaft 5 to form the above-mentioned rotor plates 2 1 , 4 ₂ .
A capacitor assembly is constructed by inserting the stator plate 6 between 2 and ₂ with the insulating films 3 ₁ and 3 ₂ at a distance, and fitting the end shaft portion 5 a of the riveted shaft 5 into the bearing hole 7 a of the substrate 7 . Place the capacitor assembly on the board 7
An insulating plate 8 having a thickness _t1 smaller than the thickness h of the coupling shaft part of the capacitor assembly excluding the thickness of the end shaft part 5a is placed in the inner space of the circular hole 8a. The assembly is accommodated and stacked on the board 7, and the gear 1 is inserted from the missing circular portion 8b of the circular hole 8a.
The fixed arms 6a and 6b formed in an angular shape on the stator plate 6 are connected to one side 8c of the insulating plate 8, with a part of the fixed arms 6a and 6b peeking out.
A thin insulating plate 9 is placed between the ends of the fixed arms 6a and 6b, a holding plate 10 having the same shape as the board 7 is placed on top of the capacitor assembly, and a holding plate 10 is placed in the bearing hole 10b of the holding plate 10. Shaft part 4 ₂ a of washer 4 ₂
This is a thin variable capacitor in which the holding plate 10, the stator plate fixing arms 6a and 6b, the thin insulating plate 9, the insulating plate 8, and the substrate 7 are connected at the four corners with rivets 11.

[Effect]

With the above configuration, the gear 1 and its rotating shaft 5 are
Since it is built into the substrate 7 and the holding plate 10 and does not come out on the surface, it is possible to make it extremely thin.

〔Example〕

The illustrated example is composed of two rotor plates 2 ₁ and 2 ₂ and one stator plate 6. 6c is a stator terminal lug formed on one fixed arm 6a of stator plate 6, 10a is a terminal lug of rotor plates 2 ₁ and 2 ₂ connected to shaft 5 together with gear 1,
It is formed on the pressing plate 10. Reference numeral 7b represents a variable capacitor mounting piece integral with the substrate 7, and 12 represents an insulating spacer between the insulating films 3 ₁ and 3 ₂ into which the stator plate 6 is inserted. In the embodiment, the rotation angle is approximately 166 degrees, and therefore the gear 1 is fan-shaped, and a stopper 13 is cut and raised in the base plate 7 to engage one end edge 1a of the gear 1. The stator fixing arms 6a, 6b of the insulating plate 8 and the receiving side 8c of the thin insulating plate 9 (insulation between 6a, 6b and the holding plate 10) thereon are formed lower by a receiving allowance _t2 thereof. 7c and 10c are notches 1a and 2 of the base plate 7 and the holding plate 10 for allowing the gear 1 to peek out.
₁ a and 2 ₂ a are non-circular shaft holes that fit into the shaft 5 having a cross section of, for example, a rectangular, oval, or other appropriate non-circular shape.

Note that the substrate 7, the insulating plate 8, and the rivet 11 are
Although it is shown exploded in the figure, it is better to insert mold it integrally when molding the insulating plate 8.
7d and 8d are protrusions and recesses for locking.

C. Effects of the invention As described in the section on effects, ultra-thin (e.g.
A variable capacitor with a thickness of 1.6 mm can be obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which FIG. 1 is a front view with a presser plate 10 removed, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is an exploded perspective view. 1 is a gear, 2 ₁ and 2 ₂ are rotor plates, 6 is a stator plate, 3 ₁ and 3 ₂ are insulating films, 7 is a substrate, 10 is a holding plate, and 8 is an insulating plate.

Claims (1)

[Claim for Utility Model Registration] A gear with teeth formed around a thin insulating plate, multiple rotor plates, and an insulating film are integrally connected to a riveted shaft by applying washers to both end faces, and insulation is created between the rotor plates. A capacitor assembly is constructed by inserting the stator plate with the film at a distance, and fitting the end shaft of the rivet shaft into the bearing hole of the board to stack the capacitor assembly on the board. An insulating plate having a thickness smaller than the thickness of the coupling shaft portion of the capacitor assembly excluding the thickness is stacked on the board with the capacitor assembly accommodated in the inner space of the circular hole, and the missing circle of the circular hole is A part of the gear is peeked out from the stator plate, a fixed arm formed in an angular shape on the stator plate is located at the corner of one side of the insulating plate, and a thin insulating plate is stacked between the ends of the fixed arm, so that the fixed arm has the same shape as the board. Lay the holding plate on top of the capacitor assembly, fit the washer shaft into the bearing hole of the holding plate, and rivet the holding plate, stator plate fixing arm, insulating thin plate above it, insulating plate, and board at the four corners. Thin variable capacitor combined with