JPS5913399A - Surface seal for electronic equipment and electronic equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cover sheet for an electronic device that covers the external surface of an electronic device such as an electronic desk calculator (hereinafter abbreviated as a calculator), and to the electronic device.

The structure of a conventional calculator is shown with reference to the exploded view in Figure 1.
Reference numeral 1 denotes an upper case made of a plastic molded product or the like, and a decorative board 2 formed by punching a thin plate of aluminum or the like and pressing such as drawing or bending is adhered to the upper surface of the upper case with an adhesive.

The upper case 1 and the decorative panel 2 have an opening 4 for making the display 3 visible from the outside, and a solar battery 5 for power supply.
In the case of a calculator that relies on A key rubber 8 having a position corresponding to the key top of each protrusion 8af that constantly presses upward is provided below. A conductive material for short-circuiting the key pattern provided on the circuit board 9 is attached to the lower surface of the protrusion 8a (not shown).
, the pattern is short-circuited by pressing the key top 7,
The key is human power. The circuit board 9 includes LSI10. resistance 11
, a capacitor 12 and other electronic components are mounted, and perform calculation processing according to key human input signals, while a display signal output from LSI10 passes through a circuit pattern and is connected to a press-fit type connector 1.
3 to the display 3 and the display is completed. ] The lower case 4 is made of a plastic molded product or the like, like the upper case 1, and is a part that covers the bottom of the calculator.

As explained above, in the conventional calculator structure, the decorative plate 2 and the key top 7, which make up the external surface of the calculator, each have a printed notation such as the model name 2a and a key symbol notation, and since they are separate parts, Separate machining steps are required. In addition, key rubber 8 to which a conductive substance is attached for pressing the key top 7 upward is required, which requires a large number of parts, which increases the cost of parts and makes the calculator assembly work complicated. I didn't get it.

The present invention is provided to solve the above-mentioned difficulties, and aims to reduce the number of parts and simplify assembly work. below,
Examples will be described in detail with reference to the drawings.

FIG. 2 is an exploded perspective view of a calculator structure showing an embodiment of the present invention. 15 is a facing sheet, which is a transparent flexible film;
For example, the key symbol characters 15C1 and the calculator model name 15d are printed on the back side of a material such as polyester film, vinyl chloride film, or polyurethane film using a printing method such as screen printing or offset printing. Solid printing in a predetermined color is applied to the entire surface except for the light receiving portion 15b. A conductive pattern made of carbon paste, silver paste, or the like for key signal input is printed approximately in the center of each key symbol 15C (not shown). Therefore, one surface sheet 15 performs the same functions as the decorative plate 2, key top 7, and key rubber 8 in the conventional example shown in FIG. In addition, when manually pressing the keys, it is necessary to press down the key symbol 15C with a finger or the like and bend the sheet itself, so the top sheet member 15 is preferably made of a material with appropriate flexibility as described above.

The facing sheet 15 is adhesively fixed to the frame and machine parts of a frame 16 made of an insulating and highly rigid material. The conductive pattern printed on the lower surface of the key symbol 15c of the cover sheet 15 and the key input circuit provided on the circuit board 9 are designed so that they do not come into contact with each other when the key symbol 15C is not operated.
A thin plate-shaped spacer 17 is interposed therebetween, and this spacer 17 is provided with a plurality of holes 17a at positions corresponding to the conductive pattern and the key input circuit. Therefore, when the key symbol 15C is pressed down with a finger or the like, the top sheet 15 easily bends downward, passes through the hole 17a, and the conductive pattern short-circuits the key input circuit, allowing manual key input. The circuit board 9 may be completely similar to the conventional one,
Electronic components such as LSI 10 are mounted on the tower. 18 is a reinforcing plate made of metal such as stainless steel plate, iron plate, aluminum plate, etc.
The cover is made of synthetic resin, etc., and covers the bottom of the calculator to protect the inside.

The reinforcing plate 18 is fixed to the frame 16 with adhesive or screws.

As explained above, by using the mounting sheet of the present invention, the conventionally used parts such as key tops, decorative plates, key rubbers, etc. can be made unnecessary, and the number of parts can be significantly reduced, thereby reducing the cost of electronic equipment. The down and assembly work is also extremely simplified, improving work efficiency. Furthermore, according to the specific embodiment, the assembly of the stain desk is completed by stacking the parts in the positional relationship shown in FIG. 2, which is very effective in automatically assembling the calculator. Furthermore, according to one aspect of the present invention, the transparent portion of the cover sheet 15 can protect the surface of the display device and solar cell provided below. Note that the transparent portion herein refers to a transparent portion that is transparent enough to allow sufficient incident light to pass through the solar cell to read the display content on the display, and does not need to be colorless and transparent.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of a conventional calculator, and FIG. 2 is an exploded perspective view showing the structure of a calculator using a top sheet 15 according to an embodiment of the present invention. 1... Upper case, 2... Decorative board, 3... Display unit,
4... Opening for display visibility, 5... Solar cell, 6...
・Light receiving window, 7...Key top, 8...Key rubber, 8
a...Protrusion, 9...Circuit board, 10...LSI,
11...Resistor, 12...Capacitor, 13...
Pressure contact type connector, 14...Lower case, 15...Top sheet, 15a...Display viewing area, 15b...Light receiving area, 15G...Key symbol character, 15d...Calculator model name, 16 ...Frame, 17...Spacer,
18... Reinforcement plate. Patent applicant Canon Co., Ltd.

Claims (5)

[Claims] (1) A sheet for mounting an electronic device, the sheet comprising a key display section printed on the front or back surface and a contact section printed on the back surface. (2) The mounting sheet for an electronic device according to item 1, wherein the sheet is substantially transparent. (3) The mounting sheet for an electronic device according to item 1, wherein the electronic device includes a display device and a solar cell, and the sheet forms a cover for these. (4) A substrate that supports a circuit, electronic components arranged on the substrate, a partition for positioning the electronic components, a key display section printed on the front or back surface, and a key display section for opening and closing the circuit. A laminate including a facing sheet covering the laminate having a contact portion with a contact formed on the back surface, and a spacer interposing a spacer between the substrate and the sheet to open a circuit when the contact is not selected. Configuration electronic equipment. (5) The electronic device according to item 1, wherein the substrate supporting the circuit is further reinforced with a reinforcing plate.