JP4417759B2 - Keyboard switch structure of electronic equipment and electronic equipment - Google Patents

Description

The present invention relates to a keyboard switch structure of an electronic device and an electronic device , and more particularly to a structure for illuminating and displaying a key top of a push button of the keyboard switch.

    An electronic device such as a portable terminal is provided with a keyboard switch that is illuminated.

  Regarding the structure of the switch button to be illuminated, the following disclosures are made in Patent Documents 1 and 2 as known literature inventions.

  According to the illumination type pointing device described in Patent Document 1, as shown in FIG. 5 which is a cross-sectional view thereof, the circumferential shape of the operation substrate 120 in which a plurality of strain detectors 122 are circumferentially arranged is formed. The hollow metal pin 150 is attached to the center mounting hole 121, the light guide 170 is disposed in the center hole 151, and the key top 160 is placed over the metal pin 150 and the light guide 170. Then, the light source 180 is mounted on the base substrate 140 so as to face the inner end face of the light guide 170.

  In this configuration, the light source 180 is placed directly below the pointing device such as the key top 160, the metal pin 150, and the light guide 170, and the light emitted from the light source 180 is provided at the center of the pointing device. The key top 160 is incident on the key top 160 and illuminated.

On the other hand, according to the switch device with illumination described in Patent Document 2, as shown in FIG. 6 which is a cross-sectional view thereof, the printed circuit board 201 at a position facing the hole 206a provided at the top of the movable contact 206 of the metal dome. Further, a through hole 202 a is provided, the light source 209 is exposed from the through hole 202 a, and the light source 209 is illuminated toward the hole 206 a of the movable contact 206.
Japanese Patent Laid-Open No. 2003-67125 JP-A-2002-260479

    By the way, in the structure of the above-mentioned patent document 1, since the pointing device itself is large, the dimension from the base substrate 140 to the upper surface of the key top 160 becomes long, the thickness of the key portion becomes large, and it is difficult to reduce the size and thickness. Further, since the structure is complicated, the cost is high and the cost is often high.

  On the other hand, in the configuration of Patent Document 2, when the printed circuit board 201 is thinner than the height of the light source 209 such as an LED, the light source 209 protrudes toward the movable contact 206 side of the printed circuit board 201, and thus the key top 160 is pressed down strongly. There is a possibility that the light source 209 is pressed.

  Further, if the movable contact 206 is not sufficiently large with respect to the size of the light source 209, it is necessary for the contact between the movable contact 206 and the fixed contact 203 on the printed circuit board 201 because of the bending rigidity of the metal dome as the movable contact 206. The amount of deformation cannot be obtained.

  For this reason, the movable contact 206 must increase in the lateral direction, and it is difficult to reduce the size.

In view of the above circumstances, an object of the present invention is to provide a keyboard switch structure of an electronic device that is small in size, has a simple configuration, is inexpensive, and has good visibility of illuminated display, and an electronic device including such a keyboard switch structure .

In order to achieve the above object, a keyboard switch structure for an electronic device according to claim 1 of the present invention has a keyboard having a key top that is pressed when the switch is turned on and off, and a switch wiring pattern formed on the surface. A keyboard switch structure of an electronic device comprising: a wiring board to be connected; and a click dome that is installed on the surface of the wiring board and reversely operates by pressing the key top to conduct between the contacts of the switch pattern, A light source body installed on the back side of the wiring board, a wiring board having a light guide hole at an outer position on the outer periphery of the click dome, and a light guide of the light source body and the wiring board on the back side of the wiring board provided opposite to the hole, before through the light guide hole to reflect light of the light source without intervening member between and between the light guide hole between the light source It is characterized in that it comprises a first reflecting portion for guiding the wiring substrate surface.
According to a fifth aspect of the present invention, there is provided an electronic apparatus comprising the same keyboard switch as in the first aspect.

  An electronic device keyboard switch structure according to claim 2 of the present invention is the keyboard switch structure of electronic device according to claim 1, wherein the click dome and the light guide hole surround the click dome and stand upward from the surface of the wiring board. The key top is provided with the side facing the key top being opened and reflecting the light of the light source body guided to the wiring board surface side through the light guide hole and preventing leakage to the outside. It is characterized by including a second reflecting portion leading to

  The keyboard switch structure of the electronic device according to claim 3 of the present invention is the keyboard switch structure of the electronic device according to claim 1 or 2, wherein the light guide hole in the wiring board is symmetrical with respect to the light source body. It is characterized by being provided with a plurality.

As described above in detail, according to the keyboard switch structure of the electronic device related to claim 1 and the electronic device related to claim 5 according to the present invention, the light source body is installed on the back surface of the wiring board. The contact is prevented in advance and the reliability is high, the click dome can be made small, and the switch can be downsized.

  In addition, since the light source body does not protrude from the surface of the wiring board and is accommodated in the dead space, the switch can be thinned.

  Further, the structure is simple and the manufacturing cost is reduced.

  According to the keyboard switch structure of the electronic device according to the second aspect, since the second reflective portion is provided, a single key can be illuminated.

  According to the keyboard switch structure of the electronic device according to claim 3, since a plurality of light guide holes are provided symmetrically with respect to the light source body, unevenness of light for illuminating the key top is prevented, and illumination display with good visibility Is obtained.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 shows the external appearance of 10 parts of a keyboard switch of a cellular phone to which the present invention is applied.

  On the casing 4 of the mobile phone, a key top 5a that is pressed when the switch is turned on / off protrudes outward.

  The keyboard switch 10 of this cellular phone is affixed to the key substrate 6 by the presser 5b1 of the keyboard 5 by pressing the key top 5a as shown in FIG. The central portion of the click dome 2 is pressed downward to perform an inversion operation, and electrical connection is obtained by connecting the contacts provided on the key board (wiring board) 6.

  Further, as shown in FIG. 2, the illuminated display of the key top 5 a in the keyboard switch 10 is a shield in which the light of the LED (light source body) 1 mounted on the back side of the key substrate 6 is assembled to the main substrate 8. Case 7 A plurality of light guide holes 3 (see FIG. 5) disposed at positions outside the outer periphery of the click dome 2 on the key substrate 6 by being reflected by a reflective recess (first reflective portion) 7a formed on the top surface of the case 7. 2) (see FIG. 3 of the sectional view taken along line B-B of FIG. 2), and the reflected light is reflected by a reflecting plate (second reflecting portion) 9 that prevents leakage to the outside to the key top 5a. Guided and illuminated.

  In the present embodiment, the case where only the switch at the center of the keyboard switch 10 shown in FIG.

  Next, the structure of the keyboard switch 10 of this mobile phone will be described.

  The key top 5a in the keyboard 5 is a resin molded product using a transparent polycarbonate or the like, and as shown in FIG. Alternatively, a metallic color is printed on the lower surface 5a2 (see FIG. 2) except for numerals and symbols that allow light from the inside to pass therethrough. Alternatively, numbers, symbols, etc. may be printed to shield the light and allow other parts to pass through.

  The above-mentioned pusher 5b1 for pressing the click dome 2 is formed so as to protrude downward as a part of the low rubber 5b. The low rubber 5b is manufactured using translucent silicon rubber or the like to transmit light. The key substrate 6 is formed in a shape that covers the key substrate 6 from above in such a manner as to define each chamber in which each click dome 2 exists.

  Each key top 5a is joined to a predetermined location on the upper surface of the low rubber 5b by adhesion, fusion, or the like to form the keyboard 5.

  On the upper surface of the key board 6, a switch wiring pattern for detecting whether the switch is turned on or off is printed. As shown in FIG. 2, the switch wiring pattern is provided at a predetermined position corresponding to the plurality of key tops 5a. A plurality of click domes 2 for connecting the contacts in the wiring pattern are attached.

  On the key substrate 6, as a switch wiring pattern corresponding to the click dome 2, a contact (not shown) of an outer peripheral pattern is formed at a position where the peripheral edge of the click dome 2 abuts. A central contact (not shown) for contacting the parts is formed at a position facing the central part of the click dome 2.

  With this configuration, when the key top 5a is pressed, the click dome 2 is reversed and the center portion of the click dome 2 comes into contact with the center contact. Conduction is made through the click dome 2 and the on / off of the switch is detected.

  The click dome 2 is manufactured using a thin metal plate, for example, a stainless steel plate, and is formed in a dome shape with a hole for extracting air when partly reversed.

  Note that the click dome 2 has conductivity for conducting the contact between the contacts, and reverses when the key top 5a is pressed, and is restored to its original shape when the key top 5a is not pressed. As long as it has an elastic property, a resin molded product formed into a dome shape may be subjected to conductive plating or the like, and is not limited to a metal plate.

  As shown in FIGS. 2 and 3, a light guide for guiding the light of the LED 1 on the back surface side of the key substrate 6 to the front surface side of the key substrate 6 is located outside the outer periphery of the click dome 2 on the key substrate 6. A plurality of holes 3 are perforated symmetrically with respect to the LED 1.

  Thus, by providing the light guide hole 3 symmetrically with respect to the LED 1, it is possible to prevent unevenness in the light that illuminates the key top 5 a, so that the illuminating display of the key top 5 a can be performed satisfactorily. The visibility of display can be improved.

  In addition, although the shape of the light guide hole 3 illustrates an oval-like shape, shapes other than the oval-like shape such as a rectangular shape, a circular shape, an elliptical shape, and the like can be arbitrarily selected as appropriate. Moreover, the number of the light guide holes 3 can also be selected arbitrarily.

  On the back surface of the key substrate 6, a predetermined wiring pattern is printed, and an LED 1 serving as a light source for illumination display of the key top 5a is mounted.

  In addition, although LED1 has illustrated the case where it mounts in the back surface of the key board | substrate 6 in this example, if it provides in the back surface side of the key board | substrate 6, it does not necessarily need to be mounted in the key board | substrate 6. FIG.

  The key board 6 is a shield assembled on the main board 8 so as to shield and block the circuit including the electronic parts from the outside for the purpose of shielding electromagnetic waves of the electronic parts and the like mounted on the main board 8. It is provided on the case 7.

  The top plate 7a of the shield case 7 has a reflective recess in a shape that prevents spatial interference with the LED 1 on the back surface of the key substrate 6 and reflects the light of the LED 1 and guides it to the surface side of the key substrate 6 through the light guide hole 3. 7a is formed, and the reflective recess 7a is provided with a reflective material for reflecting the light of the LED1.

  The shield case 7 is a resin molded product, and the entire outer surface of the shield case 7 is subjected to a plating process such as copper and nickel in order to shield electromagnetic waves. For the purpose of improvement, it is treated with pressure film plating to give it a gloss.

  Here, in order to reflect the light of the LED 1, it is only necessary to apply pressure film plating only to the reflecting concave portion 7 a so as to reflect it, but in this example, it is also used as shielding plating.

  In order to improve the reflection of the reflective recess 7a in the shield case 7, the reflective recess 7a may be glossy printed in addition to plating, or a glossy film such as PET (polyethylene). A terephthalate) sheet may be attached.

  The shield case 7 may be a pressed product made of a thin metal plate such as aluminum or stainless steel other than the resin molded product, but the reflective recess 7a is selected from a glossy material, plated, polished, etc. Therefore, it is necessary to configure so as to have sufficient reflectivity.

  As shown in FIGS. 2 and 3, the light reflected by the reflecting recess 7a and guided to the surface of the key board 6 through the light guide hole 3 is reflected and leaked to other keys. A reflector 9 is provided to surround the click dome 2 and the plurality of light guide holes 3 on the key substrate 6 for the purpose of preventing the above and guiding to the key top 5a through the low rubber 5b.

  The reflection plate 9 is formed using a glossy film, aluminum or the like, and surrounds the click dome 2 and the plurality of light guide holes 3 in order to prevent light leakage to other keys, and stands up from the surface of the key substrate 6. Thus, a part of the upper side is covered and the side opposite to the key top 5a is released in order to guide light to the key top 5a.

  Here, the reflective plate 9 is illustrated as a separate member from the low rubber 5b, but without being separated from the low rubber 5b, the inner surface of the low rubber 5b is glossy so as to have the same shape as described above. Silver carbon and aluminum-based materials may be printed or a film may be attached.

  By configuring as described above, the light guided to the surface side of the key substrate 6 is condensed and illuminates the single key top 5a, and the illumination display of the single key top 5a becomes possible.

  In addition, if it comprises without using the reflecting plate 9, the structure which illuminates another key will be attained.

  Further, in the above-described embodiment, the case where the circuit board has two circuit boards, that is, the key board 6 and the main board 8, is illustrated, but the key board 6 and the main board 8 are shared by one circuit board. When the LED of the light source is arranged on the back side of the circuit board and the electronic component is mounted on the back side of the circuit board, and there is a case below the LED and the electronic component, a concave shape is formed on the inner surface of the case. It is sufficient to provide a reflective recess.

  When forming the reflective recess, if the casing is a resin molded product, the reflective recess may be vapor-deposited, plated, etc. to give gloss and sufficient reflectivity, or the casing In the case of a metal part, it is only necessary to select a glossy material having sufficient reflectivity, or to apply good reflectivity by plating, polishing, or the like on the reflective recess of the housing.

  Accordingly, the recess for reflection is provided on the back side of the circuit board so as to oppose the LED on the back side of the circuit board and the light guide hole of the circuit board, and reflects the light of the LED through the light guide hole to the front side of the circuit board. If it is the structure led to, it can be provided on any member and is not limited to the illustrated shield case and casing.

  According to the above configuration, since the LED 1 that is the light source for illumination display of the key top 5a is installed on the back side of the key substrate 6, it is possible to prevent the click dome 2 from coming into contact with the LED 1 when the key top 5a is pressed. And is highly reliable.

  Further, since the LED 1 is on the back side of the key substrate 6 and the LED 1 is not in the click dome 2, a predetermined deformation amount for the reversing operation of the click dome 2 is possible with the click dome 2 having a small shape. Can be made.

  Further, since the LED 1 is accommodated in the dead space on the back surface side of the key substrate 6 and does not protrude to the front surface side of the key substrate 6, the switch can be thinned.

  In addition, since the configuration is simple, the manufacturing cost can be reduced.

  In addition, if a reflecting plate 9 is provided on the surface of the key substrate 6, a single key can be illuminated.

  Further, if a plurality of light guide holes 3 in the key substrate 6 are provided symmetrically with respect to the LED 1, unevenness of light for illuminating the key top 5a can be prevented, and visibility of the illuminated display of the key top 5a is good. It becomes.

  As shown in FIG. 4, the key board 26 also has a general key illumination structure component in which a plurality of keys 25a, 25a,... Are illuminated by the LED 21 installed in the low rubber 25b on the key board 26. If the light guide hole is drilled and the above-described reflector 9 is added so as to surround the click dome 22 and the light guide hole in the low rubber 25b on the key substrate 26, the same parts can be used, so that the manufacturing cost can be reduced. It is possible to illuminate a single key at a low cost.

  Therefore, according to the present invention, it is possible to realize a keyboard switch structure for an electronic device that is small, has a simple structure, is inexpensive, has high reliability, and has good visibility of illuminated display.

    As an application example of the present invention, in addition to the embodiments, not only in a small electronic device such as a cordless phone, PDA (Personal Digital Assistant), PHS (Personal Handy-phone System), electronic notebook, electronic dictionary, but also in other electronic devices The present invention can be effectively used.

The perspective view which shows the external appearance of the keyboard switch part of the mobile telephone of the Example to which this invention is applied. FIG. 2 is a cross-sectional view taken along line AA of the keyboard switch portion of the mobile phone of FIG. 1. BB line principal part sectional drawing of the keyboard switch part of the mobile telephone of FIG. Sectional drawing which shows a general keyboard switch structure. Sectional drawing which shows the illumination type pointing device in connection with the conventional patent document 1. FIG. Sectional drawing which shows the switch apparatus with illumination in connection with the conventional patent document 2.

Explanation of symbols

1 ... LED (light source),
2. Click dome,
3 ... Light guide hole,
5 ... Keyboard,
5a ... Key top,
6 ... Key board (wiring board),
7a: Recessing concave part (first reflective part),
9 ... reflector (second reflector),
10 ... Keyboard switch.

Claims (5)

A keyboard having a key top that is pressed when turning on / off the switch, a wiring board on which a wiring pattern for a switch is formed on the surface, and an inversion operation by pressing the key top. And a keyboard switch structure of an electronic device comprising a click dome for conducting between the contacts of the switch pattern,
A light source body installed on the back side of the wiring board;
A wiring board having a light guide hole at an outer position of the outer periphery of the click dome;
The light source body is provided on the back surface side of the wiring board so as to oppose the light source body and the light guide hole of the wiring board, and the light source body of the light source body is not interposed between the light source and the light guide hole . A keyboard switch structure for an electronic device, comprising: a first reflecting portion that reflects light and guides the light to the surface of the wiring board through the light guide hole. It surrounds the click dome and the light guide hole, and stands upward from the surface of the wiring board, and is provided to open the side facing the key top, and is guided to the surface of the wiring board through the light guide hole. 2. The keyboard switch structure for an electronic device according to claim 1, further comprising: a second reflecting portion that reflects light from the light source body and guides the light to the key top while preventing leakage to the outside. The keyboard switch structure for an electronic device according to claim 1, wherein a plurality of light guide holes in the wiring board are provided symmetrically with respect to the light source body.   With a shield case that closes the main board,
  The back surface of the wiring board and the top surface of the shield case are arranged to face each other,
  The first reflecting part is formed on the surface of the top plate of the shield case.
  The keyboard switch structure for an electronic apparatus according to claim 1.   A keyboard having a key top that is pressed when turning on / off the switch, a wiring board on which a wiring pattern for a switch is formed on the surface, and an inversion operation by pressing the key top. And an electronic device comprising a click dome for conducting between the contact points of the switch pattern,
  A light source body installed on the back side of the wiring board;
  A wiring board having a light guide hole at an outer position of the outer periphery of the click dome;
  The light source body is provided on the back surface side of the wiring board so as to oppose the light source body and the light guide hole of the wiring board, and the light source body of the light source body is not interposed between the light source and the light guide hole. A first reflecting portion that reflects light and guides the light to the surface of the wiring board through the light guide hole;
  Has a keyboard switch with
  An electronic device characterized by that.

Images