JPH0846375A - Miniature electronic apparatus - Google Patents

Abstract

PURPOSE:To obtain a miniature electronic apparatus, e.g. a card type remote controller or an computor, comprising a decorative panel, a circuit board, and a case in which the productivity and quality are enhanced by facilitating the assembling work without increasing the number of components. CONSTITUTION:When a circuit board 4 is set in place by inserting the forward end thereof into a cut 9 made in a case 1 and then pushing the opposite side thereof provided with a battery terminal 6 from above, a spring 8 for securing the board 8 provided by partially machining the battery terminal 6 on the end face side of the board abuts against the inner face of the case 1 and pressed resiliently against the inner face of the case 1 while being deformed. Consequently, the circuit board 4 is secured in the case 1 and even if the circuit board 4 begins to bulge, frictional resistance acts between the forward end of the spring 8 and the inner face of the case 1 to secure the circuit board 4 as it is thus preventing the panel 7 from floating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small electronic device. More specifically, the present invention relates to a small electronic device such as a card-type remote controller having a decorative plate, a circuit board and a case, which uses a battery as a power source, and a computer.

[0002]

2. Description of the Related Art In a conventional small electronic device, a circuit board is fixed in a case by a double-sided adhesive tape, an adhesive or a screw.

[0003]

However, the above-mentioned conventional technique has a problem that the assembly is time-consuming and the productivity is low, although the structure is simple. In addition, the fixing method using a double-sided adhesive tape or an adhesive has a problem in quality reliability that the circuit board and the decorative board are lifted off due to the peeling of the adhesion due to the warp of the circuit board. In order to solve the above-mentioned problems, it is necessary to use a stronger adhesive having a longer curing time, and the circuit board and the case have to be fixed with a clip or the like until they are cured.

Therefore, the present invention solves such a problem, and its object is a simple mechanism in a small electronic device having a power source, a decorative plate, a circuit board and a case without increasing the number of parts. It is to facilitate assembly and improve productivity and quality.

[0005]

A small electronic device of the present invention uses a battery as a power source, and is a small electronic device including at least a decorative plate, a circuit board and a case, on the circuit board incorporated in the case. It has a leaf spring arranged and in contact with the inner wall surface of the case.

Further, in the small electronic device, the leaf spring uses a part of a battery contact terminal on the circuit board.

Further, in the small electronic device, the shape of the tip of the leaf spring in contact with the inner wall surface is a wedge shape.

Further, the small electronic device is characterized in that it has a notch portion for fixing the leaf spring to the inner wall surface portion in contact with the leaf spring.

[0009]

According to the above-mentioned structure of the present invention, the circuit board can be assembled simply by inserting it into the case and pushing it in. Since a part of the leaf spring is pressed into the inside of the case and the wedge-shaped tip is pushed into the case inner surface, It is possible to prevent the circuit board from warping and floating.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The structure of the small electronic device of the present invention is developed and shown in FIG. Further, FIG. 2 shows a sectional structure of the small electronic device of the present invention.

A power source is set in the case 1 forming the main body of the small electronic device. Here, a coin-type lithium battery 2 is used as a power source and is set via a battery holder 3. Circuit board 4 housed in case 1
Above, electronic components such as IC5 and coin type lithium battery 2
Battery terminals 6 and 6'having respective contact points with the negative and positive electrodes are mounted by soldering. When the case 1 does not have a pair of upper and lower sides and has an integrated simple structure, a decorative plate 7 having a sheet-like switch function is often attached on the circuit board 4.

The case 1 and the battery holder 3 are made of plastic resin such as ABS resin or metal such as aluminum die-cast, and the circuit board 4 is made of a substrate material such as glass epoxy resin or paper base phenol resin. The battery terminal 6 is made by processing an elastic metal such as stainless steel which is plated with nickel or gold so as to have high electric conductivity. In the case of a card type remote controller, an electronic device such as a computer, which is characterized by a small size and a thin shape, a coin type lithium battery 2 is often used.

Conventionally, a portion of the battery terminal 6 mounted on the circuit board 4, which is fixed in the case by a double-sided adhesive tape, an adhesive, or a screw, is extended on the board end surface side and extended as shown in FIGS. 1 and 2. Bend into a zigzag shape and process,
It is used as the substrate fixing spring 8.

When the circuit board 4 is set in the case 1, the front end of the circuit board 4 is inserted into the notch 9 in the case 1 and then the portion on the opposite side having the battery terminal 6 is pushed in from above. At this time, the substrate fixing spring 8 formed of a part of the battery terminal 6 contacts the inner surface of the case 1 to be deformed and pressed by its elasticity. In this way, the circuit board 4 is fixed in the case 1, and even if the circuit board 4 warps, the tip of the board fixing spring 8 has a frictional resistance with the inner surface of the case 1 and is caught.
Does not lift the decorative plate 7 while it is fixed.

Further, if a notch 9'is provided in the inner surface of the case 1 against which the board fixing spring 8 abuts at the circuit board 4 fixing position, more reliable positioning and fixing can be achieved. If the tip of the board fixing spring 8 is formed in a wedge shape, the tip of the wedge-shaped board fixing spring 8 is caught in the wall surface of the case 1 without any special work. , When the circuit board 4 is pushed in, it is fixed and does not come up.

Further, if the decorative plate 7 is attached to the circuit board 4 and the edge of the case 1, the circuit board 4 is more securely fixed.

When the environment in which the above-mentioned small electronic equipment is used has a wide temperature range such as in an automobile and is severe in terms of quality reliability, it may be considered to use it together with a strong adhesive or a double-sided adhesive tape. It is necessary to use an adhesive having a long curing time in order to obtain a good adhesive state in terms of reliability, but the circuit board 4 is temporarily fixed in the case 1 until the adhesive is reliably cured. The method is also useful as a means. By doing so, even under a bad environment such as being left at a high temperature, it is possible to reduce the load caused by the warp or deformation of the circuit board 4 which is originally applied to the soldered portion for electrical conduction.

[0018]

As described above, according to the present invention, a battery is used as a power source, and in a small electronic device mainly composed of a decorative board, a circuit board and a case, it is arranged on a circuit board incorporated in the case. Further, by having the leaf spring in contact with the inner wall surface of the case, there is an effect that the circuit board can be easily assembled only by inserting it into the case and pushing it. In addition, since a part of the leaf spring is pressed against the inside of the case and the wedge-shaped tip is pushed into the inner surface of the case, it is possible to prevent the circuit board from warping and floating. Here, by arranging a part of the leaf spring, which is a battery contact terminal on the circuit board, so as to be in contact with the inside of the case, it is possible to obtain the same effect with a simple mechanism without adding a new component.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a small electronic device of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the small electronic device of the invention.

[Explanation of symbols]

 1 Case 2 Coin Type Lithium Battery 3 Battery Holder 4 Circuit Board 5 IC 6 Battery Terminal 7 Decorative Plate 8 Board Fixing Spring 9 Notch

Claims (4)

[Claims] 1. A small electronic device including a battery as a power source, which is composed of at least a decorative plate, a circuit board and a case, which is disposed on the circuit board incorporated in the case and contacts an inner wall surface of the case. A small electronic device having a leaf spring. 2. The small electronic device according to claim 1, wherein the leaf spring uses a part of a battery contact terminal on the circuit board. 3. The small electronic device according to claim 1, wherein the tip end of the leaf spring in contact with the inner wall surface has a wedge shape. 4. The small electronic device according to claim 1, further comprising a notch portion for fixing the leaf spring to the inner wall surface portion in contact with the leaf spring. machine.