JP4148376B2 - Pushbutton switch with display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pushbutton switch with a display device having a liquid crystal display as an operation button. The pushbutton switch with a display device having a backlight device that can be configured thinly and compactly and enables uniform and clear display. It relates to button switches.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a pushbutton switch with a display device equipped with a liquid crystal display has a multi-chip mounting type light emitting diode 129 arranged side by side or front and rear as shown in FIG. Is provided. A fluorescent tube or the like is used in the backlight of the white light emitting liquid crystal display device.
[0003]
[Problems to be solved by the invention]
A conventional pushbutton switch with a display device equipped with a liquid crystal display is expensive because a multi-chip mounted light emitting diode 129 is provided. Further, since it is necessary to secure a sufficient diffusion space in order to emit light uniformly, there is a drawback that the width of the button 121 is increased as shown in FIG . Moreover, since the backlight part becomes large in the thing using a fluorescent tube etc., there existed a fault that the height of the button 161 became large as shown in FIG .
In addition, recent technological innovations have provided white LEDs and other devices with extremely high brightness. However, they have not yet been customized and widely used, and use relatively inexpensive off-the-shelf high-brightness chip diodes. Therefore, it was necessary to realize space saving and uniform illumination.
The present invention provides a pushbutton switch with a display device that solves the above-described problems and can obtain uniform illumination even when a light source of a high-intensity light-emitting diode is disposed immediately below a liquid crystal display unit in order to save space. To do.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a pushbutton switch with a display device having a liquid crystal display on the upper surface of an operation button, and a holder inscribed in the button is provided, and a recess is formed in at least one of the buttons. the light guide plate made of light-transmissive member disposed on the holder, yet with towards substantially horizontally a light emitting element disposed in said recess, said light guide plate from the first light guide plate and the second light guide plate A second light guide plate having a tongue layer formed on at least one side is placed on the first light guide plate, and the second light guide plate faces upward and has translucency in only one direction. A light-shielding portion is formed on at least the upper surface of the light-emitting element by folding the tongue piece of the diffusion plate.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
A small-sized pushbutton switch with a liquid crystal display which can use a ready-made high-brightness single light emitting diode element for the backlight for the liquid crystal of the pushbutton switch with a display device of the present invention, and enables a clear and uniform display. Can be provided at low cost.
[0006]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front sectional view showing an embodiment of a pushbutton switch with a display device of the present invention, and FIG. 2 is an exploded perspective view thereof .
In these drawings, a rectangular and transparent display window 82 is provided on the upper surface of a box-shaped button 81 to form a display portion, and a liquid crystal plate 84 is disposed in contact with the display window 82 from within the button 81 .
[0007]
Below the liquid crystal plate 84 are a first light guide plate 86a , which is a transparent member, and a second light guide plate 86b made of a diffusive sheet that transmits only light from one side and blocks light in the opposite direction. A light guide plate made of a light-transmitting member having a layer structure, and a light emitting diode 89 for backlighting is disposed horizontally below one of the light guide plates, and a light source of the light emitting diode 89 is disposed above the light emitting diode 89 . In order to shield the light, the tongue 88 formed on one side of the second light guide plate 86b is folded to form a light shielding part. A recess 87 is formed in the first light guide plate 86 a so as to accommodate the light emitting diode 89 .
[0008]
Emitting diode 89 is a high white diode such luminance is a surface mount type which is formed a pin 90 on the side surface, the stationary contact with disposing a pair of stationary strips 91 having a resilient contact piece to a holder 99 which will be described later A light emitting diode 89 is press-fitted between the pieces 91 .
[0009]
Liquid crystal plate 84 and the first light guide plate 86a and the second light guide plate 86b and the light emitting diode 89 further stationary contact piece 91 described above is disposed within the button 81 by a holder 99 of the box-shaped.
The rectangular hole printed circuit board 12 mounted with IC 13 to form a circuit pattern penetrates along the side wall of the holder 99 while being arranged below the holder 99 is formed, the interconnector 5 is inserted . Both ends of the interconnector 5 are in contact with the flange surface of the liquid crystal plate 84 and the connector portion 18 of the printed circuit board 12 and are electrically connected only in the vertical direction.
[0010]
A circuit pattern connected to the upper surface by a through hole is formed on the lower surface of the printed circuit board 12 and connected to the connector portion 16 of the flexible printed circuit board 14 by soldering.
[0011]
The flexible printed circuit board 14 is formed with a fitting portion 26 that protrudes above a plunger 25 described later and a hole portion 15 for loosely fitting a cylindrical portion that hangs down from the press plate 20, and is connected to the printed circuit board 12. The printed circuit board 14 is inverted while holding the flexible printed circuit board 14 around the lower surface of the holder 99 and the upper surface of the leather plate 20, and the cylindrical portion hanging from the resin plate 20 is loosely fitted into the hole 15 so that the connector 18 is connected to the side surface. After mounting so as to be led out, a convex portion 21 formed facing the press plate 20 is fitted into a square hole 83 formed in the button 81 in a concave-convex relationship to constitute a liquid crystal display device.
[0012]
A case 35 constituting the outer body of the switch body incorporates a connector 33, an N / O switch element 30, an N / C switch element 31, and a leaf spring 28 for maintaining an operation balance. A connector portion 17 at one end of the substrate 14 is inserted and connected. Further, after incorporating the plunger 25 having the operation part 27 for driving the contact of each switch element, the cover 22 is fitted into the convex part 36 of the case 35 with the square hole 24 to form the switch body, A cylindrical portion that hangs down from the press plate 20 and a fitting portion 26 that protrudes upward from the plunger 25 are fitted together to constitute a pushbutton switch with a display device of the present invention.
[0013]
The display device with push-button switch of the present invention configured as described above, the tongue of the light emitting diode 89 is emitting light despite directly under the liquid crystal panel 84 is formed on one second light guide plate 86b The second light guide plate is formed of a diffusing sheet having a directivity that transmits only light from one side and blocks light in the opposite direction while covering the light guide plate with the first light guide plate 86a of the transparent member. The light guide plate 86b has a two-layer structure, so that not only the light emission source is strongly emphasized in the image from the display window side but also the tongue piece due to the light diffusion effect of the second light guide plate 86b. Since the shadow of the light shielding portion itself formed by folding 88 is not generated, a uniform and clear pushbutton switch with a liquid crystal display device can be configured without unevenness.
[0014]
Further, since the diffusion space of the light-emitting diode 89 can be minimized, a space-saving pushbutton switch with a liquid crystal display device can be obtained, and the cost can be reduced by using an inexpensive high-brightness chip diode. It is also possible to reduce it.
[0015]
Further, since the configuration can be pressed disposed a light emitting diode 89 of the surface mount chip type stationary contact pieces, not only the assembly, and also allows replacement of the light emitting diode 89, reduced parts inventory with easier maintenance Produces an effect that can also be realized.
[0016]
Since the light guide plate is divided as described above, the light guide plates 86a and 86b perform the function of diffusing the optical path in the horizontal plane and the direction of diffusing in the direction of the display window 82 , thereby forming a more uniform and bright backlight. it can to Rutotomoni shielding portion can form a very simple shielding portion hardly becomes shadow, it is possible further applications of the processing method and processing of the light-shielding portion becomes easy.
[0017]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
(1) In a pushbutton switch with a display device provided with a liquid crystal display on the upper surface of an operation button, a light guide plate made of a translucent member provided with a holder inscribed in the button and having a recess formed in at least one of the buttons is provided. Since the light emitting element is disposed in the recess with the light emitting element facing substantially horizontally, the liquid crystal display window has a small edge and the button thickness is thin, and the push button switch with a display device having a good design is configured. be able to.
(2) A light guide plate made of a translucent member in which a recess is formed is disposed in the holder, and the light emitting element is disposed substantially horizontally in the recess and a light shielding portion is formed on at least the upper surface of the light emitting element. Therefore, a pushbutton switch with a uniform illumination display device in which the light source is not conspicuous can be configured.
(3) The light guide plate has a two-layer structure including a first light guide plate and a second light guide plate, and a light shielding portion is formed on at least the upper surface of the light emitting element between the first light guide plate and the second light guide plate. Therefore, since the light source is not conspicuous and the reflected light interferes with the upper surface of the light shielding portion, it is possible to provide a clear pushbutton switch with a display device in which the light shielding portion does not become a shadow.
(4) A second light guide plate in which a tongue piece is formed on at least one side is placed on the first light guide plate, and the second light guide plate is directed upward and diffused only in one direction. Since the light shielding portion is formed by folding the tongue piece of the diffusion plate, the light shielding portion can be very easily formed without increasing the number of parts and the processing steps.
(5) Since the surface mounting type light emitting diode with the terminals bent on both sides is press-fitted and fixed, and the fixed contact piece that comes into contact with the terminal is provided, the pushbutton switch with a display device that makes it easy to assemble and replace the light emitting diode is provided. can do.
(6) Since the surface-mounted light-emitting diodes with the terminals bent on both sides are press-fitted and fixed, and the fixed contact pieces that come into contact with the terminals are arranged, the emission colors can be easily handled, and the inventory of assembly parts can be reduced. Can do.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing an embodiment of a pushbutton switch with a display device of the present invention.
FIG. 2 is an exploded perspective view showing an embodiment of the pushbutton switch with a display device of the present invention.
3 is an exploded perspective view of an essential part with a conventional display device pushbutton switch.
FIG. 4 is a front view of a conventional pushbutton switch with a display device.
[Explanation of symbols]
81, 121, 161 Button 82, 122 Display window 24, 83, 123 Square hole 84, 124 Liquid crystal plate 5 Interconnector 87 Recess 89, 129 Light emitting diode 90, 130 Terminal 91 Fixed contact 12 Printed circuit board 13 IC part 14 Flexible Printed circuit board 15, 23 Hole part 16, 17, 18 Connector part 99, 139 Holder 20 Press plate 21, 36 Convex part 22 Cover 25 Plunger 26 Fitting part 27 Actuating part 28 Leaf spring 29 Coil spring 30 N / O switch element 31 N / C switch element 32 Switch terminal 33 Connector 34 Connector terminal 35, 195 Case 86a First light guide plate 86b Second light guide plate 88 Tongue piece 126 Diffuser

Claims (1)

In the pushbutton switch with a display device having a liquid crystal display on the upper surface of the operation button, a holder inscribed in the button is provided, and a light guide plate made of a translucent member having a recess formed in at least one of the buttons is arranged in the holder. And the light-emitting element is disposed in the recess in a substantially horizontal direction, and the light guide plate has a two-layer structure including a first light guide plate and a second light guide plate, and is disposed on the first light guide plate. A second light guide plate having a tongue piece formed on at least one side is placed, and the second light guide plate is directed upward to form a diffusion plate having translucency in only one direction, and the tongue piece of the diffusion plate is folded. A push button switch with a display device , wherein a light shielding portion is formed on at least the upper surface of the light emitting element by returning the light shielding element.

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