Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1997-10-31
2000-09-05
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200339, 200557, H01H 900, H01H 2300, H04N 564
Patent
active
061146374
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a liquid-crystal display apparatus used as a portable liquid-crystal television set, portable liquid-crystal monitor apparatus, or the like. More particularly, this invention is concerned with an improvement to the mechanism of a switch manipulator used to tune a channel and included in a liquid-crystal display apparatus.
A liquid-crystal display apparatus for displaying an image on a liquid-crystal panel can be designed to be lighter in weight, more compact, thinner, and lower in power consumption than a conventional display apparatus for displaying an image on a cathode-ray tube. The liquid-crystal display apparatus is therefore widely adopted as a portable display apparatus such as a monitor apparatus, television set, multimedia equipment, or the like.
2. Background Art
A liquid-crystal display apparatus includes a switch used to adjust brightness or contrast so as to adjust the visibility of a displayed image and a variable resistor used to adjust a volume. When the liquid-crystal display apparatus is used as a liquid-crystal television set, a channel tuning switch used to tune a television reception channel is also included.
The structure of switches and their surroundings in a conventional liquid-crystal display apparatus is described in, for example, Japanese Unexamined Patent Publication No. 3-157076, Japanese Utility Model Publication No. 63-200874, or Japanese Utility Model Publication No. 1-49888.
In Japanese Unexamined Patent Publication No. 3-157076, a plurality of operation switches having switch manipulators jutting from an upper case have been disclosed. Operations are carried out by pressing the jutting switch manipulators of the operation switches with a finger.
Japanese Utility Model Publication No. 63-200874 has disclosed a structure where a switch manipulator is a push button; the apex of the push button is jutting out from a case; when the push button is pressed, a contact attached to the push button comes into contact with an opposed contact; and when the push button is released, the contact is separated owing to a recovering force exerted by an elastic member (made of, for example, rubber).
The Japanese Utility Model Publication No. 1-49888 has disclosed a liquid-crystal display having a plurality of tactile switches that are very small push-button switches, and a structure where manipulation buttons are placed on the tops of the switch manipulators of the tactile switches; and when any switch manipulator is released, the pressed manipulation button is recovered to an original state owing to a returning force exerted by the tactile switch.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a switch manipulator that has a structure including a seesaw-like manipulation button and utilizing a distorting force and returning force exerted by the switch manipulator itself, has a mechanism in which a gap can be set easily, and which exerts a stable returning force and enables mass-production at low cost and provides easy maintenance, and offers excellent operability. Another object of the present invention is to provide a liquid-crystal display apparatus having the switch manipulator.
According to one aspect of the present invention, there is provided a liquid-crystal display apparatus in which at least a liquid-crystal display unit accommodating a liquid-crystal panel and switches are stowed in a case, and at least an image display unit and a switch manipulator for use in manipulating the switches are located on the face of the case. The switch manipulator includes at least two switches. The two switches are separated from each other, and a manipulation button is placed over the two switches. First and second button pressers are located near both ends of the manipulation button with substantially the center of the manipulation button as a fulcrum. When the manipulation button is pressed, one of the two switches is selectively turned on or off by either the first or second button pres
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Matsuyama Katsuo
Nakao Takuji
Citizen Watch Co. Ltd.
Scott J. R.
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