JP4378189B2 - Push button device - Google Patents

Description

  The present invention relates to a push button device used for audio equipment, video equipment, and the like.

  As a device for operating and stopping devices such as an audio device and a video device, a push button device that switches a switch on / off state by pressing a switch via a button is often used. In particular, a push button device such as an audio device or a video device used in an automobile or the like uses an illumination button that illuminates the button so that it can be easily operated at night (see, for example, Patent Document 1). .

  As shown in FIG. 7, in the push button device 80 described in Patent Document 1, since the light emitted from the light source 82 passes through the light guide plate 84 and the button 86, the button 86 is illuminated. When the button 86 is pressed, the light guide plate 84 rotates with the mounting portion 88 of the light guide plate 84 as a fulcrum, and the switch pressing portion 90 presses the switch 92.

JP-A-11-143410 (4th to 8th paragraphs, FIG. 4)

  In the push button device 80 described in Patent Document 1, the light guide plate 84 and the button 86 are disposed in front of the light source 82, and the light source 82 and the central portion of the light guide plate 84 and the button 86 are substantially one. Therefore, the entire button 86 can be illuminated brightly.

  However, there is a further demand for an illumination button typified by the push button device 80 described above. One of them is to realize a thin panel in which an illumination button is arranged in a desired design. A problem in making the panel thin is that the distance between the light source and the button becomes short, and it becomes difficult to uniformly illuminate the entire button. In addition, there is a desire to improve the feel when the button is pressed.

  The present invention has been made in view of the above demands, and an object of the present invention is to realize a thin panel that improves the feel when the button is pressed and illuminates the illumination button more uniformly.

In order to achieve the above object, a push button device according to the present invention has a circuit board, a push switch provided on the circuit board, a light source provided around the switch on the circuit board, and the switch as a center. A light guide member that has a translucency that covers and transmits light from the light source and that presses the switch; a light guide member that is disposed on the back side of the button and includes a diffusely reflecting portion that diffusely reflects light from the light source; And a reflection portion that prevents light from the light source from directly entering the button, the light guide member includes a thin portion that covers the light source, a through hole that penetrates the switch, and a through hole And a thick part that is thicker than the thin part, and the reflective part is opposed to the light source at a part that covers the light source of the thin part. It is formed on a surface which does not Both the irregular reflection portion is formed as a plurality of recesses recessed in the direction of the button on the surface facing the circuit board in the thick portion, it is intended.

A configuration in which a plurality of light sources are provided can be employed . Also, the reflective portion may adopt a configuration that is formed by printing in white light guiding member.

Also, among the pressing surface of the button, it is possible to at least a portion of the portion covering the switch, to adopt a configuration of providing a label. This mark is preferably formed by printing on the button in white or silver.

  ADVANTAGE OF THE INVENTION According to this invention, the touch when a button is pushed is better and the thin panel which illuminates an illumination button more uniformly is obtained.

  Hereinafter, embodiments of a push button device according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front view (FIG. 1A) showing a push button device 10 according to an embodiment of the present invention, and a cross-sectional view taken along line XX of FIG. 1A (FIG. 1B). . The push button device 10 is an example of a circuit board 12, a push switch 14 attached to the circuit board 12, a light emitting diode 16 that is an example of a light source, a button 18 that pushes the switch 14, and a light guide member. And a certain light guide plate 20.

  The circuit board 12 is alternately switched between the operating state and the stopped state of the electric circuit by pressing the switch 14. That is, when the switch 14 is pressed when the electric circuit is in a stopped state, the electric circuit is activated, and when the switch 14 is pressed again when the electric circuit is in an activated state, the electric circuit is stopped.

  In the present embodiment, the switch 14 is a tact switch and is disposed on the back side of the central portion of the button 18. By disposing the switch 14 on the back side of the central portion of the button 18, the button 18 can be pressed horizontally while maintaining the balance of the upper, lower, left, and right of the button 18. For this reason, the touch when the button 18 is pressed is good.

  Two light emitting diodes 16 are arranged around the switch 14 on the circuit board 12. Since a plurality of the light emitting diodes 16 are provided around the switch 14, it is possible to prevent the illumination of the button 18 from being biased. In the present embodiment, the light emitting diodes 16 are provided at two locations on a straight line so as to sandwich the switch 14, but the light emitting diodes 16 are not necessarily arranged on the straight line.

  Further, the number of the light emitting diodes 16 may be three or more. When three light emitting diodes 16 are provided, it is more preferable to arrange them so that the central angle is 120 degrees with the switch 14 as the center, in order to achieve uniform illumination.

  Further, as shown in FIG. 1B, the thickness of the light emitting diode 16 is considerably smaller than the thickness of the switch 14. By making the thickness of the light emitting diode 16 considerably smaller than the thickness of the switch 14, the outer peripheral portion of the light guide member can be thinned and the light emitting diode 16 can be covered with this thin portion, as will be described later. The reflecting portion 22 (see FIG. 4) can be provided in this thin portion.

  The light source is preferably the light emitting diode 16 for reasons such as high brightness, low power consumption and low heat generation, and small size. However, other than the light emitting diode 16, for example, an electric display lamp, an organic EL element, or the like may be used as the light source.

  FIG. 2 is a front view of the button 18 of the push button device 10 of FIG. FIG. 3 is a top view of the button 18 of FIG.

  As shown in FIGS. 2 and 3, the button 18 includes a disk-shaped thin back member 26 having protrusions 24 on the side surfaces and a disk-shaped thick front member 28. It is formed by joining so that the parts overlap each other. The back member 26 is made of milky white polycarbonate having a thickness of about 0.6 mm. The front member 28 is made of a colored translucent polycarbonate having a thickness of about 3.2 mm. In a state where the back member 26 and the front member 28 are overlapped, the button 18 has translucency that allows light from the light emitting diode 16 to pass therethrough.

  The button 18 is disposed so as to cover the switch 14 exposed through the through hole 30 of the light guide plate 20. When the button 18 is pressed, the disk protrusion 26 a moves in the direction of the switch 14 and presses the switch 14. Further, since the switch 14 passes through the through hole 30, the switch 14 can be directly pressed by the button 18, and the push button device 10 can be further reduced in thickness.

  Further, at least a part of the center of the pressing surface of the button 18 that covers the switch 14, the function of the button 18 or the trademark of the product on which the push button device 10 is mounted, characters, symbols or A sign 32 that is displayed as a graphic or the like is provided. The mark 32 is formed by white or silver silk screen printing.

  By providing the mark 32 on the pressing surface of the button 18, the function of the button 18 can be easily recognized. Further, by providing the mark 32 at the center of the pressing surface of the button 18 that covers the switch 14, there is no irregular reflection portion 34 (see FIG. 5), so that the button 18 is slightly darkened. The center part of the button 18 is hidden by the sign 32 so that the button 18 appears to be evenly illuminated.

  Further, by making the sign 32 white or silver, a part of the light from the light emitting diode 16 is transmitted through the sign 32, so that the sign 32 itself can be prevented from becoming a shadow of light. It should be noted that by appropriately adjusting the arrangement and shape of the sign 32, the sign 32 itself can be prevented from becoming a shadow of light even if the sign 32 has a color other than white or silver. In this case, a sign 32 other than white or silver can be employed.

  FIG. 4 is a front view of a light guide plate (light guide member) of the push button device of FIG. 1. FIG. 5 is a rear view of the light guide plate of FIG. 6 is a cross-sectional view taken along line YY of the light guide plate of FIG.

  The light guide plate 20 covers the circuit board 12 and, as shown in FIGS. 4 to 6, a thin portion having a thick portion 36 provided with a through hole 30 for exposing the switch 14 and a portion covering the light emitting diode 16. 38 is a plate-like member.

  The light guide plate 20 is made of a member that transmits light, for example, an acrylic resin. The thickness of the thick part 36 is about 2.3 mm, and the thickness of the thin part 38 is about 0.6 mm. The thin portion 38 has the thinnest thickness that can be molded with resin.

  The light guide plate 20 has a function of transmitting light from the light emitting diode 16 while diffusing. The light diffused and transmitted by the light guide plate 20 reaches the button 18 in a uniform state, and further passes through the button 18 and is recognized by the operator of the push button device 10.

  The through hole 30 is formed at the center of the light guide plate 20. The through hole 30 is for exposing the switch 14. When the push button device 10 is assembled, the circuit board 12 provided with the switch 14 is mounted on the panel 40 from the rear so that the switch 14 fits into the through hole 30.

  In addition, on the surface of the thick portion 36 of the light guide plate 20 facing the circuit board 12, an irregular reflection portion 34 that diffusely reflects light from the light emitting diode 16 is provided integrally with the light guide plate 20. Since the irregular reflection portion 34 is provided on the surface of the thick portion 36 of the light guide plate 20 facing the circuit board 12, the entire surface of the button 18 is illuminated almost uniformly even when the light emitting diode 16 is on the back side of the outer peripheral portion of the button 18. be able to.

  The irregular reflection portion 34 is composed of a plurality of concave portions 42 that are recessed in the direction of the button 18. Since the irregular reflection portion 34 is a concave portion 42 formed integrally with the light guide plate 20, the light guide plate 20 and the irregular reflection portion 34 can be produced in the same process.

  Two portions that cover the light emitting diodes 16 are formed in the thin portion 38 of the light guide plate 20. And in the part which covers the light emitting diode 16 of this thin part 38, the light from the light emitting diode 16 injects into the button 18 directly in the surface (surface on the button 18 side of the light-guide plate 20) which does not oppose the light emitting diode 16. FIG. The reflection part 22 which prevents this is provided.

  Since the light emitting diode 16 is covered with the reflecting portion 22, it is possible to prevent the illumination light intensity at the outer peripheral portion of the button 18 covering the light emitting diode 16 from becoming too strong. Moreover, since the reflection part 22 was provided in the thin part 38 of the light-guide plate 20, the process of incorporating the light-guide plate 20 and the reflection part 22 in the assembly process of the pushbutton apparatus 10 can be performed together. The reflection part 22 is formed by white silk screen printing. The printing method is not limited to silk screen printing.

  By adopting white printing, the amount of straight light from the light emitting diode 16 can be moderately suppressed. Therefore, when the light-emitting diode 16 having high directivity is used, it is possible to prevent only the outer peripheral portion of the button 18 from being illuminated strongly.

  Further, since the irregular reflection portion 34 is provided in the thick portion 36, the light generated at the outer peripheral portion of the light guide plate 20 is reflected by the reflection portion 22 and further diffused inward by the irregular reflection portion 34. Due to the synergistic effect of the reflection portion 22 and the irregular reflection portion 34, the entire button 18 can be illuminated uniformly even if the light emitting diode 16 is disposed on the outer peripheral portion of the light guide plate 20.

  Next, the assembly process of the push button device 10 will be described with reference to FIGS. 1 and 2.

  First, the switch 14 and the two light emitting diodes 16 are incorporated on the circuit board 12. On the other hand, the light guide plate 20 is mounted on a predetermined mounting portion of the panel 40, and then the button 18 is mounted on the panel 40 so as to overlap the front surface of the light guide plate 20. Next, the decorative panel 44 is mounted from the front surface of the panel 40 through the button 18.

  This mounting is performed so that a hole (not shown) of the panel 40 and a protrusion (not shown) of the decorative panel 44 are engaged. Next, the hole part of the panel 40 and the projection part of the decorative panel 44 which were engaged are weld-processed, and the panel 40 and the decorative panel 44 are fixed. Finally, the circuit board 12 in which the switch 14 and the light emitting diode 16 are incorporated is attached from the rear side of the panel 40.

  Next, a mechanism in which the light generated from the light emitting diode 16 is uniformly transmitted through the button 18 will be described.

  Since the light emitting diode 16 has strong directivity, most of the light generated from the light emitting diode 16 goes straight. The straightly traveling light is reflected by the reflecting portion 22 and enters the thick portion 36. Part of the light incident on the thick part 36 passes through the thick part 36 and reaches the button 18. The remainder of the light is diffused uniformly in the inner direction (center direction) of the thick portion 36 while being reflected and refracted by the irregular reflection portion 34 that is the concave portion 42. By this action, the light reaches the buttons 18 uniformly.

  In this way, due to the synergistic action of the reflection part 22 and the irregular reflection part 34, even if there is a light source on the outside, the light diffuses inward, and the button 18 is illuminated uniformly over the entire surface. Therefore, when the push button device 10 is thin, even when the light emitting diodes 16 are arranged on the inner periphery of the button 18, the button 18 can be illuminated uniformly.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented in various modified forms. For example, only one light emitting diode 16 may be disposed around the light guide plate 20. Further, the thin portion 38 of the light guide plate 20 may be a through hole.

  Further, the irregular reflection portion 34 may be a cylindrical or prismatic concave portion instead of the hemispherical concave portion 42. Furthermore, instead of the through hole 30 provided in the center of the light guide plate 20, a recess having a thin front surface may be provided in the center of the light guide plate 20. This is because, when the concave portion is thin, it is possible to transmit to the switch 14 the pressing of the disk protrusion 26a of the button 18.

  The present invention can be applied to a push button device used for audio equipment, video equipment, and the like. Further, the present invention can be applied to all electrical / electrical equipment having a detachable panel. In particular, it can be suitably used for a notebook personal computer, a personal digital assistant (PDA), a mobile phone, etc. whose case itself is thin.

It is a figure which shows the pushbutton apparatus which concerns on embodiment of this invention, (a) is a front view, (b) is XX sectional drawing of (a). It is a front view of the button of the pushbutton device of FIG. FIG. 3 is a top view of the button of FIG. 2. It is a front view of the light-guide plate (light guide member) of the pushbutton apparatus of FIG. It is a rear view of the light guide plate (light guide member) of FIG. It is the YY sectional view taken on the line of the light-guide plate (light guide member) of FIG. It is sectional drawing which shows the conventional pushbutton apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pushbutton device 12 Circuit board 14 Switch 16 Light emitting diode (light source)
18 Button 20 Light guide plate (light guide member)
22 reflective part 30 through-hole 32 sign 34 diffuse reflection part 40 panel 42 recessed part 44 decorative panel

Claims (5)

A circuit board;
A push-type switch provided on the circuit board;
A light source provided around the switch on the circuit board;
A button that covers the switch as a center and has translucency to transmit light from the light source, and presses the switch;
A light guide member that is disposed on the back side of the button and has a diffused reflection part that diffusely reflects light from the light source;
A reflection unit between the light source and the button and preventing light from the light source from directly entering the button;
Have
The light guide member includes a thin portion that covers the light source, a through-hole that penetrates the switch, and is formed on the inner side of the portion where the through-hole is formed and the thin portion is formed. With a thick wall part,
The reflective portion is formed on a surface of the thin portion that covers the light source and is not opposed to the light source ,
The irregular reflection portion is formed as a plurality of recesses recessed in the direction of the button on the facing surface between the circuit board in the upper KinikuAtsu unit,
A push button device characterized by that.   The push button device according to claim 1, wherein a plurality of the light sources are provided.   The push button device according to claim 1, wherein the reflection portion is formed by printing on the light guide member in white.   The push button device according to any one of claims 1 to 3, wherein a sign is provided on at least a part of a portion of the pressing surface of the button that covers the switch.   5. The push button device according to claim 4, wherein the mark is formed by printing on the button in white or silver color.

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