JPH10125162A - Operating key lighting system for small electronic apparatus - Google Patents

Operating key lighting system for small electronic apparatus

Info

Publication number
JPH10125162A
JPH10125162A JP8297762A JP29776296A JPH10125162A JP H10125162 A JPH10125162 A JP H10125162A JP 8297762 A JP8297762 A JP 8297762A JP 29776296 A JP29776296 A JP 29776296A JP H10125162 A JPH10125162 A JP H10125162A
Authority
JP
Japan
Prior art keywords
light
key
sheet
light leakage
leakage prevention
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8297762A
Other languages
Japanese (ja)
Inventor
Takeshi Sato
武志 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kokusai Electric Corp
Original Assignee
Kokusai Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kokusai Electric Corp filed Critical Kokusai Electric Corp
Priority to JP8297762A priority Critical patent/JPH10125162A/en
Publication of JPH10125162A publication Critical patent/JPH10125162A/en
Pending legal-status Critical Current

Links

Landscapes

  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an operating key lighting system, capable of inexpensively and surely preventing light leakage. SOLUTION: A light-leakage preventive sheet 10, wherein a surface and a back surface are adopted as light low-/high-reflectance surfaces respectively, is provided between a key pad rubber 5 and an electronic circuit board 6 provided with a luminous element 8, and also a key sheet 9 is provided on the surface of the board 6. The surface of the key sheet 9 is made to have a high- reflectance surface, thereby preventing light leakage on the surface of he light- leakage preventive sheet 10, and reflecting and diffusing light on the back surface of the light-leakage preventive sheet 10 and the surface of the key sheet 9.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は小型電子機器の操作
キー照明装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for operating keys of small electronic equipment.

【0002】[0002]

【従来の技術】小型電子機器、特に携帯用電子機器では
野外での使用等、種々の環境で使用され、暗所で使用さ
れることも多い。この為、暗所での操作性を向上させる
目的で操作キーを照明するバックライト機能を具備して
いるものが多い。
2. Description of the Related Art Small electronic devices, particularly portable electronic devices, are used in various environments, such as outdoor use, and are often used in dark places. For this reason, many devices have a backlight function for illuminating operation keys for the purpose of improving operability in a dark place.

【0003】操作キーのバックライト機能としては、暗
所での操作性、意匠性、省電力の観点から操作キーを個
々に判別できる様に照明している。
The backlight of the operation keys is illuminated so that the operation keys can be individually identified from the viewpoint of operability in a dark place, designability, and power saving.

【0004】従来の操作キー照明装置としては、以下に
述べるものがある。
A conventional operation key illumination device is described below.

【0005】スイッチユニットはスイッチ回路基板に、
各操作キーに対応するスイッチが設けられたキーシー
ト、キーボタンが接着或は一体成型されたキーパッドゴ
ムを重合させた構成を有する。前記キーボタン、キーパ
ッドゴムは透光性を有し、前記スイッチ回路基板に設け
た発光ダイオード等の発光素子により前記キーボタンを
照明していた。
The switch unit is mounted on a switch circuit board,
A key sheet provided with a switch corresponding to each operation key, and a configuration in which key buttons are bonded or integrally molded with a keypad rubber are provided. The key buttons and the keypad rubber have translucency, and the key buttons are illuminated by light emitting elements such as light emitting diodes provided on the switch circuit board.

【0006】又、通常操作キーの機能、種類を判別でき
る様、キーボタンを照明することで文字、記号が判別で
きる様になっているが、暗所で文字、記号を確実に認識
できる様にするには充分なコントラストが必要であり、
その為にはノイズとなる漏光を防止する必要がある。
[0006] Also, characters and symbols can be distinguished by illuminating key buttons so that the functions and types of the normal operation keys can be distinguished. However, characters and symbols can be reliably recognized in a dark place. To have enough contrast,
For that purpose, it is necessary to prevent light leakage which causes noise.

【0007】従来の漏光防止は、キーボタンがゴム製で
キーボタンがキーパッドゴムと一体成型されている場合
は、キーパッドゴムの表面全体に漏光防止用の黒色印
刷、或は塗装を施し、又キーボタンが透明樹脂でキーボ
タンの押えとしてキーパッドゴムが用いられている場合
は、キーパッドゴムの表面に同様な漏光防止用の黒色印
刷、或は塗装を施していた。
In the conventional light leakage prevention, when the key button is made of rubber and the key button is formed integrally with the keypad rubber, black printing or painting is applied to the entire surface of the keypad rubber to prevent light leakage. In the case where the key buttons are made of a transparent resin and a key pad rubber is used as a key button holder, the surface of the key pad rubber is similarly black-printed or painted to prevent light leakage.

【0008】[0008]

【発明が解決しようとする課題】上記した従来例では、
キーパッドゴムの表面に黒色印刷、塗装を施しており、
この表面処理の為にコスト高を招いていたという問題が
あった。
In the above conventional example,
Black printing and painting on the surface of the keypad rubber,
There was a problem that the cost was increased due to this surface treatment.

【0009】本発明は斯かる実情に鑑み、安価で確実に
漏光が防止できる小型電子機器の操作キー照明装置を提
供しようとするものである。
The present invention has been made in view of the above circumstances, and has as its object to provide an operation key illumination device for a small electronic device which is inexpensive and can surely prevent light leakage.

【0010】[0010]

【課題を解決するための手段】本発明は、キーパッドゴ
ムと発光素子が設けられた電子回路基板との間に表面が
光低反射率面、裏面が光高反射率面とした漏光防止シー
トを設けると共に電子回路基板の表面にキーシートを設
け、該キーシートの表面を高反射率面とし、或はキーシ
ートの表面を金属箔で覆ったものである。
According to the present invention, there is provided a light leakage preventing sheet having a low light reflectance surface on a front surface and a high light reflectance surface on a back surface between a keypad rubber and an electronic circuit board provided with a light emitting element. And a key sheet is provided on the surface of the electronic circuit board, and the surface of the key sheet is made to have a high reflectance surface, or the surface of the key sheet is covered with metal foil.

【0011】漏光防止シートの表面が光低反射率面であ
るので漏光が防止され、又漏光防止シートの裏面、キー
シートの表面を高反射率面としたので、両者間で光が反
射拡散される。又、キーシートの表面を金属箔で覆うこ
とでシールド効果が生じる。
Since the surface of the light leakage prevention sheet has a low light reflectance surface, light leakage is prevented. Further, since the back surface of the light leakage prevention sheet and the surface of the key sheet are made high reflectance surfaces, light is reflected and diffused between the two. You. Further, by covering the surface of the key sheet with metal foil, a shielding effect is produced.

【0012】[0012]

【発明の実施の形態】以下、図面を参照しつつ本発明の
実施の形態を説明する。
Embodiments of the present invention will be described below with reference to the drawings.

【0013】図中、1は小型電子機器のフロントパネル
であり、該フロントパネル1にはキーボタン2が嵌入す
るキーボタン孔3が形成されている。図中、4はキーパ
ッドであり、該キーパッド4は透光性を有する乳白色の
シリコーンゴム材から成るキーパッドゴム5と該キーパ
ッドゴム5の前記キーボタン孔3に対応する位置に接着
されたキーボタン2から成る。該キーボタン2は透明樹
脂材から成っており、キーボタン2は底面周囲に前記キ
ーボタン孔3より大きなフランジ2aを有している。
又、前記キーボタン2の底面には文字(記号)抜きべた
印刷が施されている。この印刷は遮光性、例えば黒色等
が選択される。
In FIG. 1, reference numeral 1 denotes a front panel of a small electronic device. The front panel 1 has a key button hole 3 into which a key button 2 is fitted. In the figure, reference numeral 4 denotes a keypad. The keypad 4 is bonded to a keypad rubber 5 made of a translucent milky white silicone rubber material and to a position corresponding to the key button hole 3 of the keypad rubber 5. Key button 2. The key button 2 is made of a transparent resin material, and the key button 2 has a flange 2a larger than the key button hole 3 around the bottom surface.
The bottom of the key button 2 is printed with a solid character (symbol). For this printing, a light-shielding property, for example, black or the like is selected.

【0014】前記キーパッド4は電子回路基板6により
前記フロントパネル1に対して押圧される様にフロント
パネル1と電子回路基板6との間に設けられ、該電子回
路基板6は前記フロントパネル1に形成された爪7によ
って保持される。前記電子回路基板6の表面(フロント
パネル1側面)の所要箇所に発光ダイオード等の発光素
子8が設けられている。
The keypad 4 is provided between the front panel 1 and the electronic circuit board 6 so as to be pressed against the front panel 1 by the electronic circuit board 6. Is held by the claw 7 formed on the base. A light-emitting element 8 such as a light-emitting diode is provided at a required position on the surface of the electronic circuit board 6 (side surface of the front panel 1).

【0015】前記電子回路基板6の表面には継断用の接
点を具備し、該接点を前記電子回路基板6の接点に接触
離反させる機能を有するキーシート9を接着する。該キ
ーシート9の前記発光素子8対応位置には逃げ孔12が
穿設され、前記発光素子8は前記キーシート9より突出
する様になっている。又、該キーシート9の表面はアル
ミ箔等鏡面材質のシートが貼設されている。前記キーシ
ート9の表面にアルミ箔等金属泊を貼設することでシー
ルド効果が生ずる。
A key sheet 9 is provided on the surface of the electronic circuit board 6 and has a contact for disconnection, and has a function of bringing the contact into contact with and separating from the contact on the electronic circuit board 6. An escape hole 12 is formed in the key sheet 9 at a position corresponding to the light emitting element 8, and the light emitting element 8 projects from the key sheet 9. Further, a sheet of a mirror surface material such as aluminum foil is stuck on the surface of the key sheet 9. By attaching a metal pad such as an aluminum foil to the surface of the key sheet 9, a shielding effect is produced.

【0016】前記キーシート9とキーパッドゴム5間に
漏光防止シート10が挾設され、該漏光防止シート10
の表面は黒色、裏面は白色となっており、又漏光防止シ
ート10には前記キーボタン2に対応し、キーボタン2
と同形状の透光孔11が穿設されている。又、漏光防止
シート10の所要箇所には位置決め用孔(図示せず)が
穿設され、該位置決め用孔は前記キーパッドゴム5の裏
面に突設された位置決め用突起(図示せず)と合致し、
位置決めが成される様になっている。前記漏光防止シー
ト10は表面側の黒色により漏光防止を行い、白色の裏
面とキーシート9の鏡面とで反射拡散を行う。
A light leakage prevention sheet 10 is sandwiched between the key sheet 9 and the keypad rubber 5.
Are black on the front surface and white on the back surface. The light leakage prevention sheet 10 corresponds to the key button 2,
A light-transmitting hole 11 having the same shape as that of FIG. Further, a positioning hole (not shown) is formed at a required portion of the light leakage prevention sheet 10, and the positioning hole is formed with a positioning projection (not shown) projecting from the back surface of the keypad rubber 5. Mate,
Positioning is performed. The light leakage prevention sheet 10 prevents light leakage by the black color on the front side, and reflects and diffuses the white back surface and the mirror surface of the key sheet 9.

【0017】以下、作用を説明する。Hereinafter, the operation will be described.

【0018】前記発光素子8を発光させると、該発光素
子8から射出された光は前記キーパッドゴム5に入光
し、更に前記キーシート9の前記漏光防止シート10に
覆われていない前記透光孔11の部分で反射され、前記
キーパッドゴム5全体に均一に拡散され、キーボタン2
を照明する。この時、前記キーパッドゴム5から前記キ
ーボタン2のフランジ2aの端面より光が浸入し、前記
フロントパネル1と前記キーボタン2との隙間から光が
漏れてしまうのであるが、キーパッドゴム5の裏面に設
けられている前記漏光防止シート10はキーボタン2の
キートップ部分以外は黒色となっているので漏光が認識
されることがない。尚、漏光防止シート10と前記キー
シート9間に入射した光は、漏光防止シート10の裏面
は白色となっており、漏光防止シート10とキーシート
9間で反射が行われるので拡散に影響を及ぼすことはな
い。
When the light emitting element 8 emits light, the light emitted from the light emitting element 8 enters the keypad rubber 5, and further transmits the light that is not covered by the light leakage prevention sheet 10 of the key sheet 9. The light reflected by the light hole 11 is uniformly diffused throughout the keypad rubber 5, and the key button 2
To illuminate. At this time, light penetrates from the end face of the flange 2a of the key button 2 from the key pad rubber 5, and light leaks from a gap between the front panel 1 and the key button 2. Since the light leakage prevention sheet 10 provided on the back surface is black except for the key top portion of the key button 2, light leakage is not recognized. The light incident between the light leakage prevention sheet 10 and the key sheet 9 is white on the back surface of the light leakage prevention sheet 10 and is reflected between the light leakage prevention sheet 10 and the key sheet 9. Has no effect.

【0019】尚、前記漏光防止シート10の表面は黒色
に限らず低反射率の面であり、裏面は白色に限らず、明
色或は鏡面等高率で光を反射するものであればよく、同
様にキーシート9の表面も鏡面に限らず光高反射率面で
あればよい。
The front surface of the light leakage prevention sheet 10 is not limited to black and has a low reflectance, and the back surface is not limited to white but may be any material that reflects light at a light color or a mirror surface. Similarly, the surface of the key sheet 9 is not limited to a mirror surface but may be any surface having a high light reflectance.

【0020】[0020]

【発明の効果】以上述べた如く本発明によれば、漏光防
止シートを設けることでキーパッドゴムへの印刷が省略
でき、コストの低減を図り得、又キーシート表面にアル
ミ箔等金属泊で覆った場合はシールド効果が発揮され
る。
As described above, according to the present invention, by providing the light leakage prevention sheet, printing on the keypad rubber can be omitted, the cost can be reduced, and the key sheet surface can be covered with metal such as aluminum foil. When covered, the shield effect is exhibited.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施の形態を示す分解斜視図である。FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

【図2】同前断面図である。FIG. 2 is a front sectional view of the same.

【符号の説明】[Explanation of symbols]

1 フロントパネル 2 キーボタン 5 キーパッドゴム 6 電子回路基板 8 発光素子 9 キーシート 10 漏光防止シート DESCRIPTION OF SYMBOLS 1 Front panel 2 Key button 5 Keypad rubber 6 Electronic circuit board 8 Light emitting element 9 Key sheet 10 Light leakage prevention sheet

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 キーパッドゴムと発光素子が設けられた
電子回路基板との間に表面が光低反射率面、裏面が光高
反射率面とした漏光防止シートを設けると共に電子回路
基板の表面にキーシートを設け、該キーシートの表面を
高反射率面としたことを特徴とする小型電子機器の操作
キー照明装置。
1. A light leakage prevention sheet having a light-reflecting surface on a front surface and a light-reflecting surface on a rear surface is provided between a keypad rubber and an electronic circuit board on which a light emitting element is provided. A key sheet, and a surface of the key sheet is a high reflectance surface.
【請求項2】 キーシートの表面を金属箔で覆った請求
項1の小型電子機器の操作キー照明装置。
2. The operation key illumination device for a small electronic device according to claim 1, wherein the surface of the key sheet is covered with a metal foil.
JP8297762A 1996-10-21 1996-10-21 Operating key lighting system for small electronic apparatus Pending JPH10125162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8297762A JPH10125162A (en) 1996-10-21 1996-10-21 Operating key lighting system for small electronic apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8297762A JPH10125162A (en) 1996-10-21 1996-10-21 Operating key lighting system for small electronic apparatus

Publications (1)

Publication Number Publication Date
JPH10125162A true JPH10125162A (en) 1998-05-15

Family

ID=17850852

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8297762A Pending JPH10125162A (en) 1996-10-21 1996-10-21 Operating key lighting system for small electronic apparatus

Country Status (1)

Country Link
JP (1) JPH10125162A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006092898A (en) * 2004-09-24 2006-04-06 Polymatech Co Ltd Illumination type key pad
JP2008294804A (en) * 2007-05-25 2008-12-04 Kyocera Corp Mobile electronic device
KR100940045B1 (en) * 2008-02-29 2010-02-04 한국성전(주) Keypad type input apparatus for mobile phone and flexible printed circuit board suitable for the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006092898A (en) * 2004-09-24 2006-04-06 Polymatech Co Ltd Illumination type key pad
JP2008294804A (en) * 2007-05-25 2008-12-04 Kyocera Corp Mobile electronic device
KR100940045B1 (en) * 2008-02-29 2010-02-04 한국성전(주) Keypad type input apparatus for mobile phone and flexible printed circuit board suitable for the same

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