JPH0447930B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a thin keyboard switch made of plastic film and made transparent including the contact pattern. The present invention relates to a keyboard switch that can prevent a decrease in visibility due to interference fringes generated between the keyboard switch and the display when the switch is operated while the display is viewed from above the keyboard switch.

``Prior art'' This type of sheet-like or membrane-type keyboard switch, which is mainly made of plastic film material,
It is widely used as a switch input means in various fields such as electrical and electronic equipment, and its basic structure is to prepare two plastic films that serve as a base material and a switch sheet, and to attach a large number of sets of switch operations to these films. It is constructed by providing a plurality of required contact patterns facing each other so as to form a gap, and in some forms, it has a dome shape etc. that gives the operator a feeling of switch operation such as a click feeling when operating the switch. A structure including a switch seat is also known. Such a keyboard switch can be constructed thinly and flatly, and can be easily installed in a variety of layouts for devices, and can also optimize the design effect of the entire product, such as devices, so it is widely used in various fields. is extremely wide.

Furthermore, this type of keyboard switch can be entirely transparent if the contact pattern is formed using a transparent conductive material such as indium oxide, and this type of keyboard switch can be used in various types. A configuration has also been proposed in which the device is placed on a display and required switch operations are processed while viewing the display appearing on the display from above.

``Problems to be solved by the invention'' In the transparent type keyboard switch as described above, as conceptually shown in Fig. 2, a base material is provided with a fixed contact pattern 3 such as a comb-shaped electrode made of a transparent conductive material. A see-through type keyboard switch body is formed by positioning and disposing a switch sheet 2 on which a transparent movable contact pattern 4 is formed to form a switch mechanism, using an adhesive or the like in view of transmittance. The optional decorative board 5 is placed on the switch sheet 2.
It is constructed so that it can also be provided with.

When performing a switch operation while looking through the display 7 from above the keyboard switch, the contact surface 9 between the keyboard switch and the display 7 may not be in uniform contact with each other, and there may be slight contact between the keyboard switch and the display 7. Due to the formation of gaps, the so-called moiré phenomenon in which speckled interference fringes appear when viewed from above due to the difference in reflectance between the contact surface and the micro-gap surface, or only the contact portion becomes wet. This often deteriorates the visibility of the display 7 and interferes with switch operation.

"Means for Solving the Problems" The present invention provides a keyboard switch that can prevent visibility deterioration due to interference fringes or moiré that often occur in transparent keyboard switches such as those described above. Therefore, in the present invention,
This is a transparent keyboard switch body with dots made of a transparent material formed on the contact surface of the display.

``Function'' By providing dots made of a transparent material on the contact surface between the keyboard switch body and the display as a structure to prevent interference fringes, it is possible to obtain a uniform contact state between the keyboard switch body and the display. Therefore, it is possible to stably maintain the visibility of this type of see-through type keyboard switch. Such interference fringe prevention dots can be easily configured to provide optimum effects by matching the shape or thickness of the ribbed pattern to the structure of the keyboard switch and display.

"Embodiment" FIG. 1 shows a conceptual cross-sectional configuration diagram of a keyboard switch according to an embodiment of the present invention.
The same reference numerals as in the figures indicate the same components, and the main structure is that fine dots 8 are arranged on the contact surface between the base material 1 of the keyboard switch and the display 7 using a material such as transparent resin. The dots 8 eliminate partial contact between the keyboard switch body and the display 7 and the formation of minute gaps, thereby preventing interference fringes, or so-called moiré. The means for disposing the dots 8 as such an interference fringe prevention structure may be appropriately provided on the lower surface of the base material 1 or on the glass surface of the display 7, or instead of such means, the dots 8 may be provided as described above. A separate film having dots formed on both sides may be interposed on the above-mentioned contact surface.

Which of the above-mentioned interference fringe prevention structures consisting of dots is adopted can be determined by arbitrarily setting the pattern shape and thickness of the dots 8, taking into consideration the structure of the keyboard switch, the model or function of the display 7, etc. It is possible to construct an interference fringe prevention structure that is optimal for this type of see-through type keyboard switch. In addition, the keyboard switch in the drawing is shown as an example of using a switch sheet that maintains an operating gap by molding, but this is constructed in a flat shape like the base material, and the structure by using the required spacer also has the above-mentioned interference fringes. Prevention structures can be applied as well.

``Effects of the Invention'' As mentioned above, the keyboard switch of the present invention is a see-through type keyboard switch used by being placed on various displays, and an interference fringe prevention structure made of transparent fine dots is provided between the keyboard switch and the display. With this structure, it is possible to provide a keyboard switch with excellent operability while ensuring good visibility of the display. In addition, the dot means as an interference fringe prevention structure has the feature that it can be easily attached to various types of keyboard switches or displays of this type, or can be interposed between them. There are many things that can be achieved by applying it to transparent keyboard switches.

[Brief explanation of the drawing]

FIG. 1 is a conceptual cross-sectional view of the essential parts of a see-through type keyboard switch in which an interference fringe prevention structure is constructed with transparent dots according to an embodiment of the invention, and FIG. 2 is a see-through type keyboard switch with a conventional structure. A similar cross-sectional configuration diagram of essential parts of a keyboard switch is shown. The names of the symbols shown in the attached drawings are as follows. 1: Base material, 2: Switch sheet, 3: Fixed contact pattern, 4: Movable contact pattern, 5: Decorative board, 7: Display, 8: Transparent fine dots,
9: Contact surface.

Claims (1)

[Claims] 1. Arranging a switch sheet on which other contact patterns are formed so as to face the contact patterns above the base material having the required number of contact patterns,
A switch operation gap is formed between both of these contact patterns, and each component including both of the contact patterns is arranged transparently on a display, and the switch is operated while looking through the display from above. A keyboard switch according to the invention, characterized in that dot means made of a transparent member is disposed between the base material and the display.