JPS5819823A - Keyboard device - 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 keyboard device used in a remote control transmitter, an electronic desktop calculator, etc., and is capable of easily cleaning even if foreign matter gets into the operating push buttons. The aim is to provide what is possible.

First, a conventional keyboard device of this type will be explained with reference to FIG. Here, 1 is a substrate on which a fixed contact 2 is formed of a printed conductor or the like, and 3 is a contact made of conductive resin that integrally has a movable contact part 4 that can come into contact with the fixed contact 2, and a push button part 6 connected to the movable contact part 4. These plates were stacked and attached by engaging with the retaining pieces 7 of the front cover 6, and the back cover 8 covering the substrate 1 side was also attached to the front cover 6 with screws or the like. In addition, 9 is a through hole through which the push button part 6 of the contact plate 3 is inserted, and 10 is a movable contact part 40.
A protrusion 11 pressed against the peripheral substrate 1 is a plate for decoration or display.

However, in this type of keyboard device, especially when used at home, foreign matter such as soy sauce or chemical seasonings may be accidentally introduced into the interior through the through hole 9 from the push button portion 6 on the front surface. Therefore, it is often necessary to clean the surface of the internal contact plate 3. However, in the conventional device as described above, in order to clean the surface of the contact plate 3, the back cover 8 is removed, the board 1 and the contact plate 3 are removed from the engagement piece 7 of the front cover 6, and the entire surface is cleaned. It had to be disassembled into pieces, which was extremely inconvenient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a keyboard device that can be easily cleaned even if foreign matter enters the push button.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 12 is a substrate on which the fixed contact 13 is formed of printed foil or the like, and 14 is a contact plate made of conductive resin that integrally has a movable contact part 16 that contacts the fixed contact 13 and a push button part 16 connected thereto. be. 17 is this board 1
2 and the contact plate 14, and is attached so that the board 12 and the contact plate 14 are overlapped and their peripheral parts are engaged with and clamped by the retaining piece 18 of the frame 17. . Reference numeral 19 denotes a back cover that covers the board 12 side, and is attached to the frame 7 with screws or the like. Also 2
o is a surface cover that covers the contact plate 14 side, and has a through hole 21 through which the push button part 16 is pushed and a projection part 22 that presses the peripheral part of the movable contact part 14 against the board 12; It is detachably attached to the frame 17 by fitting the protrusion 24 into the formed groove 23.

26 is a decorative or display plate.

With this configuration, in the event that foreign matter such as soy sauce or chemical seasonings breaks into the push button portion 16 on the front surface during use and enters the interior through the through hole 21, the front cover 20 can be removed from the frame 17. The surface of the contact plate 14 can be exposed simply by simply wiping it with a cloth, and can be easily cleaned. Moreover, in this case, the contact plate 14 and the board 12 remain attached to the frame 17 and do not need to be removed.
Since there is no need to disassemble the entire device into pieces, there is also the advantage that there is no risk of changing the assembled state of the entire device, and there is no risk of any adverse effect on performance. Therefore, foreign matter that has entered the surface of the contact plate 14 can be cleaned very easily and safely by simply removing the surface cover 20, which is extremely convenient.

Note that the structure for removably attaching the surface cover 20 to the frame 17 is not limited to the structure using the grooves 23 and the protrusions 24 as described above, and any attachment means may be designed and used. .

As detailed above, according to the present invention, even if a foreign object such as soy sauce gets into the keyboard device of a remote control transmitter or an electronic desk calculator, the front cover can be removed. It is possible to obtain a convenient device in which the surface of the contact plate can be cleaned simply by simply cleaning the surface of the contact plate without changing other assembly conditions.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional keyboard device, and FIG. 2 is a sectional view of a keyboard device according to an embodiment of the present invention. 12... Board, 13... Fixed contact, 1
4...Contact plate, 16...Movable contact part, 1
6...Push button part, 17...Frame, 18
...Engagement piece, 19...Back cover, 2
o...Surface cuckoo, 6 21...Through hole, 22...Protrusion, 23
... Concave groove, 24 ... Protrusion.

Claims (1)

[Claims] A substrate on which a fixed contact is formed, a contact plate made of conductive resin that integrally has a movable contact part that can come into contact with the fixed contact, and a push button part connected to the movable contact part are superimposed, and their peripheral parts are is attached to the frame by being sandwiched therein, and a back cover is attached to the frame to cover the surface on the board side, and the movable contact covers the surface on the contact plate side and has a through hole through which the push button part is pushed through, and the movable contact A keyboard device characterized in that a surface cover having a protrusion that presses a peripheral portion of the keyboard against the substrate is detachably attached to the frame.