JPS6134663Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention relates to a luminescent key input device, and in particular to a key input device such as a calculator that has a large number of key symbols, when used in a dark place, each key symbol However, each one is clearly recognizable.

<Prior Art> Luminous switches for electric lamps have been proposed in the past, in which a part or base of the switch is coated with a luminescent substance so that its location can be recognized even at night. This type of switch simply turns the light on and off, so you only need to know the approximate location of the switch.

However, key input devices used in devices such as calculators generally have a large number of keys, so in order to use them even at night, it is necessary to know not only the approximate positions of the keys but also the symbols of each key. must be able to recognize that.

<Purpose> The present invention was developed in view of the above problems, and each key symbol printed on the display sheet has an elastic sheet laminated underneath it, that is, an elastic sheet made of a fluorescent material. A luminescent key input device suitable for key input devices consisting of many keys such as calculators, which has a structure that illuminates with light so that each key can be operated accurately even at night or in a dark place. We aim to provide the following.

<Example> The present invention will be explained in detail below based on the figures.

FIG. 1 is a plan view of a luminescent key input device according to the present invention, and FIG. 2 is a sectional view thereof.

In the figure, 1 is a display sheet made of a transparent resin film, and a key symbol 2 is printed on the top surface of this sheet.

Reference numeral 3 denotes an elastic sheet, for example, an elastic sheet made of an insulating rubber member, on which movable contacts 4 made of conductive rubber or the like are provided at positions corresponding to each key symbol 2 on the display sheet 1. A phosphorescent material whose main component is zinc sulfide (eg, ZnS:Cu) is mixed in advance.

Reference numeral 5 denotes a printed circuit board on which fixed contacts 6 are provided at positions facing each movable contact 4 of the elastic sheet 3, and these display sheet 1, elastic sheet 3, and printed circuit board 5 are laminated and integrated to form a key input device. It consists of

According to such a key input device, when external light is irradiated onto the elastic sheet 3 through the transparent display sheet 1, energy from the light is stored by the phosphorescent material mixed in the elastic sheet 3 in advance.
Therefore, even if external light is blocked and the surroundings become dark, the surface of the elastic sheet 3 emits light due to the luminescence phenomenon caused by the phosphorescent material. At this time, the display sheet 1 on the upper surface of the elastic sheet 3 is illuminated, and the periphery of the key symbols 2 printed on the sheet 1 becomes brighter, making each key symbol 2 appear to stand out.

In this way, the key input device of the above embodiment can recognize each key symbol, so when it is applied to a key input device that requires a large number of keys, such as a calculator, it is possible to recognize each key symbol. Can be operated accurately.

<Effects> As explained in detail above, the luminescent key input device of the present invention is constructed so that each key symbol printed on the display sheet is illuminated by an elastic sheet containing a fluorescent material. , the contents of each key symbol can be clearly recognized. Therefore, even if the key input device has many keys at night, the function of each key can be identified and operated accurately.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a luminescent key input device according to the present invention, and FIG. 2 is a sectional view of FIG. 1. 1 is a display sheet, 2 is a key symbol,
3 is an elastic sheet, and 5 is a printed circuit board.

Claims (1)

[Claims for Utility Model Registration] A display sheet formed by printing a plurality of key symbols on a transparent film, and an elastic sheet having movable contacts at positions corresponding to the key symbols and containing a fluorescent material. , a printed circuit board having a fixed contact at a position corresponding to the movable contact, and a printed circuit board having a fixed contact at a position corresponding to the movable contact are laminated, and a key symbol on a display sheet is illuminated by light generated from the elastic sheet. input device.