JPS61216077A - Covering sheet thin type electronic equipment - Google Patents

Abstract

PURPOSE:To eliminate sharply the number of parts of a thin type electronic equipment by using a flexible covering sheet having a key display part at one surface side and a contact part at a rear surface side as the covering sheet of the electronic equipment. CONSTITUTION:A covering sheet 15 has sheet body made of a transparent flexible film having a rear surface on which a key symbol character 15c and a name of a type of an electronic calculator 15d is printed. The sheet body has a front surface except for a display view part 15a and a photodetective part 15b of a solar battery 5 applied a prescribed colored solid printing to form a transparent layer. Substantially at center part of the respective key symbols 15c, a conductive pattern by a carbon paste or a silver paste of the like for inputting a key signal is printed to form a contact. Between the conductive pattern printed on a lower surface of the key symbol 15c of the surface sheet 15 and a key input circuit 9a disposed on a circuit substrate 9, a thin plate like spacer 17 is interposed so as not to contact with each other during the key symbol 15c being not operated. On the spacer 17, there are plural holes 17a at positions corresponding to the key input circuit 9a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cover sheet for thin electronic devices such as electronic desk calculators (hereinafter abbreviated as calculators).

[Prior Art] The structure of a conventional calculator is shown with reference to the exploded view in Fig. 1.
Reference numeral 1 denotes an upper case made of a plastic molded product, etc., 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 viewing the display 3 from the outside, and in the case of a calculator that relies on a solar cell 5 for power, a light receiving window 6 is provided. The plurality of key tops 7 are vertically slidably fitted into the key top holes of the upper case 1, and the protrusion 8a that constantly presses the key tops 7 upward is positioned at a position corresponding to each key top. A key rubber 8 having a key is provided below. The protrusion 8
A conductive material is attached to the lower surface of the circuit board 9 (not shown) for short-circuiting the pattern for manual key operation provided on the circuit board 9. When the key top 7 is pressed, the pattern is short-circuited and the key is operated manually. The circuit board 9 is equipped with electronic components such as an LSI101 resistor 11 and a capacitor 12, and performs arithmetic processing according to key human input signals, while the display signal output from the LSI101 passes through the circuit pattern and is connected to the display via the pressure contact type connector 13. 3 and displayed. A lower case 14 is made of a plastic molded product, etc., like the upper case 1, and is a part that covers the bottom surface 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 28 and a key symbol notation, and since they are separate parts, Separate machining steps are required. In addition, it is necessary to provide an opening 4 for the display device and a light receiving window for the solar cell 5 on the decorative panel 2 and the upper case 1, respectively. Clear panels must be installed on windows.

[Problems to be Solved by the Invention] The present invention is provided to solve the above-mentioned difficulties, and aims to propose a mounting sheet for thin electronic devices that can reduce the number of parts and simplify assembly work. purpose.

[Means for solving the problem] As a means for solving this problem, for example, the second
The cover sheet 15 of the electronic device in the embodiment shown in the figure is a flexible sheet made of a substantially transparent material. A non-transparent area is formed on this sheet 15 excluding the corresponding parts of the display device and solar cell to be installed, a key display part is formed in this non-transparent area, and the surface of the thin electronic device having the display device and the solar cell is formed. Use as a sheet.

[Function] According to the configuration shown in FIG. 2, the non-transparent part of the cover sheet 15 can be used as a keyboard part including keys and key contacts, and the transparent part can be used as a display device and a window for a solar cell. can.

[Example] Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 2 is an exploded perspective view showing the structure of an electronic desktop calculator (hereinafter referred to as a calculator) using a cover sheet for a thin electronic device, which is an embodiment of the present invention. In the figure, reference numeral 15 is a facing sheet, which is made of a transparent flexible film such as polyester film, vinyl chloride film, polyurethane film, etc., and key symbols are printed on the back side of the sheet body using a printing method such as screen printing or offset printing. character 15c1
The calculator model name 15d is printed, and the front surface except for the display viewing area 15a and the light receiving area 15b of the solar cell 5 is solid printed in a predetermined color to form a non-transparent tank. At approximately the center of each key symbol 15c, a contact (not shown) is formed by printing a conductive pattern made of carbon paste, silver paste, etc. for inputting a key signal. Therefore, the first
The same functions as the decorative board 2, key top 7, and key rubber 8 in the conventional example shown in the figure are achieved with a single top sheet 15. Note that 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 sheet member on the surface of the sheet 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. Notch 16a on frame 16.

16b and 16c are display device 3, solar cell 51, L
This is a space for positioning and storing the SI10, and 16d is a space for storing the spacer 17. A thin plate-like spacer is provided so that the conductive pattern, which is a movable contact printed on the lower surface of the key symbol 15c of the cover sheet 15, and the key input circuit 9a provided on the circuit board 9 do not come into contact with each other when the key symbol 15c is not operated. 17 is interposed between them. This spacer 17 is provided with a plurality of holes 57a at positions corresponding to the conductive pattern and the key input circuit 9a. Therefore, when the key symbol 15C° portion is pressed down with a finger or the like, the top sheet 15 easily bends downward, and the hole 17
a, the conductive pattern short-circuits the key input circuit 9a, and manual key operation becomes possible. The circuit board 9 may be completely similar to a conventional one, and has electronic components such as LSI10 mounted thereon. Reference numeral 18 denotes a reinforcing plate as a bottom plate of the calculator, which is made of a metal material such as a stainless steel plate, an iron plate, an aluminum plate, or a synthetic resin, and covers the bottom surface of the calculator to protect the inside. The reinforcing plate 18 is fixed to the frame 16 with adhesive or screws.

[Effects of the Invention] As explained above, by using the cover sheet according to the present invention having a key display portion on one side (front or back side) and a contact portion on the back side, it is possible to improve This eliminates the need for previously used parts such as key tops, decorative plates, and key rubber, and the number of parts can be significantly reduced, making it possible to reduce the cost of thin electronic devices. Furthermore, the assembly work is also extremely simplified and work efficiency is improved. Further, according to a specific embodiment, assembly of the calculator is completed by simply stacking the parts in the positional relationship shown in FIG. 2 and fixing them together with adhesive or the like. Therefore, it is very effective in automatically assembling electronic devices such as calculators. Furthermore, according to one aspect of the present invention, the transparent portion of the cover sheet 15 protects 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 contents of the display, and does not need to be colorless and transparent.

Furthermore, if a structure is adopted in which the facing sheet, frame, and reinforcing plate are laminated and bonded as in this embodiment, waterproofness and dustproofness can be easily achieved.

[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 topsheet according to an embodiment of the present invention. , In the figure, 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, 8a... Protrusion, 9... Circuit board, 10...
LSI, 11...Resistor, 12...Capacitor, 13
...Impact type connector, 14...Lower case, 15...
・Surface sheet, 15a...Display viewing area, 15b...
Light receiving part, 15c...Key symbol character, 15d...
Calculator model name, 16...Frame, 17...Spacer, 18...Reinforcement plate. Patent applicant Canon Co., Ltd. (Tomoe) - and 22L1

Claims (2)

[Claims] (1) A sheet body formed in a sheet shape from a substantially transparent and flexible material, and a sheet body formed on the sheet body except for the corresponding parts of the display device and solar cell to be installed. A thin electronic device comprising a non-transparent region and a key display portion formed in the non-transparent region of the sheet main body, the sheet main body forming a cover of the thin electronic device having a display device and a solar cell. Surface sheet. (2) The thin type according to claim 1, wherein the non-transparent region is formed by a non-transparent layer, and the non-transparent layer and the key display section are formed on the same side of the sheet body. Cover sheet for electronic equipment.