JPH1174774A - Detector for touchless switch - Google Patents
Detector for touchless switchInfo
- Publication number
- JPH1174774A JPH1174774A JP27322097A JP27322097A JPH1174774A JP H1174774 A JPH1174774 A JP H1174774A JP 27322097 A JP27322097 A JP 27322097A JP 27322097 A JP27322097 A JP 27322097A JP H1174774 A JPH1174774 A JP H1174774A
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- light
- circuit
- modulation signal
- 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.)
- Granted
Links
Landscapes
- Testing Of Optical Devices Or Fibers (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Electronic Switches (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、特願平７−３１３
４４０号において開示されている発明の一部材に係わ
り、詳しくは、文字や絵を描いたプレートと結像手段と
の間にハーフミラーを設けた構成のタッチレススイッチ
の検出装置に関する。[0001] The present invention relates to Japanese Patent Application No. 7-313.
More particularly, the present invention relates to a touchless switch detection device having a configuration in which a half mirror is provided between a plate on which a character or a picture is drawn and an imaging unit.
【０００２】[0002]
【従来の技術】本出願人は、全く新しいタイプの非接触
スイッチとして、平成６年１２月５日にタッチレスパネ
ルスイッチなる発明を出願し（特願平６−３３３７２７
号）、平成７年１０月２４日には、同様の非接触スイッ
チであるタッチレススイッチなる発明を出願している
（前記特願平７−３１３４４０号）。前記タッチレスス
イッチなる発明において、文字や絵を描いたプレートと
結像手段である屈折率分布型レンズ素子との間にハーフ
ミラーを設けた構成のタッチレススイッチのアイデアが
提案されている。2. Description of the Related Art The present applicant filed an application for a touchless panel switch on December 5, 1994 as a completely new type of non-contact switch (Japanese Patent Application No. Hei 6-333727).
On October 24, 1995, a similar non-contact switch, a touchless switch, was filed (Japanese Patent Application No. Hei 7-313440). In the touchless switch, there has been proposed an idea of a touchless switch having a configuration in which a half mirror is provided between a plate on which a character or a picture is drawn and a gradient index lens element serving as an imaging unit.
【０００３】本発明で問題とする検出装置は、この文字
や絵を描いたプレートと結像手段（例えば屈折率分布型
レンズ素子）との間にハーフミラーを設けた構成のタッ
チレススイッチの検出装置に関するものであり、以後、
タッチレススイッチと言えば、特にこのタイプのタッチ
レススイッチのみを意味するものとする。A detection device according to the present invention detects a touchless switch having a configuration in which a half mirror is provided between a plate on which a character or a picture is drawn and an imaging means (for example, a gradient index lens element). Related to the device,
The term touchless switch particularly means only this type of touchless switch.
【０００４】図２を参照してタッチレススイッチについ
て説明する。タッチレススイッチは、伝送元である物体
（以後、元絵８とも称する）を結像手段９（例えば屈折
率分布型レンズ素子）により空中に投射（写像）し、前
記物体の実像８ａをスイッチのキーとして空中に表示さ
せ、スイッチ操作のターゲットとして利用しようとする
ものである。このタッチレススイッチにおいて、空中に
表示されたキーに接近してくる被検出物（オペレータの
指など、図示せず）は、次のように検出していた。A touchless switch will be described with reference to FIG. The touchless switch projects (maps) an object that is a transmission source (hereinafter also referred to as an original picture 8) into the air by an imaging unit 9 (for example, a gradient index lens element), and outputs a real image 8a of the object to the switch. It is intended to be displayed in the air as a key and to be used as a target for a switch operation. In this touchless switch, an object to be detected (not shown, such as an operator's finger) approaching a key displayed in the air has been detected as follows.
【０００５】前記空中のキー、すなわち元絵の実像８ａ
を照射し得る所定の位置に発光素子１を設ける（１個で
も複数個でもよい）。発光素子１を発した光（赤外線も
含む）は、前記キーに接近してきた指で反射し、結像手
段９を介して元絵８への方に伝送される。元絵８と結像
手段９との間には、ハーフミラー１０が設けてあるの
で、発光素子１を発し、指で反射して結像手段９を通っ
てきた光は、一部はハーフミラー１０で反射する。ハー
フミラー１０で反射してきた発光素子１からの光を受光
し得る位置に、受光素子５が設けられているので、空中
のキーに触れようとしてくる物体（指）を検出すること
ができる。The key in the air, that is, the real image 8a of the original picture
The light emitting element 1 is provided at a predetermined position where light can be irradiated (one or a plurality of light emitting elements may be provided). The light (including infrared rays) emitted from the light emitting element 1 is reflected by the finger approaching the key and transmitted to the original picture 8 via the image forming means 9. Since a half mirror 10 is provided between the original picture 8 and the image forming means 9, light emitted from the light emitting element 1 and reflected by a finger and passed through the image forming means 9 is partially reflected by the half mirror. Reflect at 10. Since the light receiving element 5 is provided at a position where the light from the light emitting element 1 reflected by the half mirror 10 can be received, an object (finger) coming into contact with a key in the air can be detected.
【０００６】受光素子５を設ける位置は、発光素子１を
発した光が指で反射してから結像手段９へ入射するまで
の光線の軌跡の距離と、結像手段９を出射してからハー
フミラー１０で反射し、受光素子５へ入射するまでの光
線の軌跡の距離と、が概ね等しくなる位置が最も望まし
い。The position where the light receiving element 5 is provided depends on the distance of the trajectory of the light beam from the time when the light emitted from the light emitting element 1 is reflected by the finger to the time when the light enters the image forming means 9, and after the light is emitted from the image forming means 9. The position where the distance of the trajectory of the light beam reflected by the half mirror 10 and incident on the light receiving element 5 is almost equal is most desirable.
【０００７】このような従来のタッチレススイッチにお
いて、発光素子１へ変調信号を入力させ、変調光を出射
させ、該変調光を受光素子５で受光し、同期検出・復調
を行うことによって被検出物の検出を行うことが考えら
れる。いわゆる変調型の光電スイッチを使用するわけで
ある。むしろ、ノイズに対し強いタッチレススイッチを
構成できるので、そのほうが好ましいと言える。In such a conventional touchless switch, a modulation signal is input to the light emitting element 1, the modulated light is emitted, the modulated light is received by the light receiving element 5, and synchronous detection / demodulation is performed. It is conceivable to detect an object. That is, a so-called modulation type photoelectric switch is used. Rather, a touchless switch that is resistant to noise can be configured.
【０００８】図２は、従来のタッチレススイッチの検出
装置に変調型の光電スイッチを使用した場合のブロック
図である。点イ、点ロ、点ハ、点ニまたは点ホに被検出
物が在ったとした場合、それらの各点において、前記被
検出物を検出してしまう可能性がある。どの点で被検出
物を検出でき、どの点で検出できないかは、発光素子１
の光軸、指向性、発光強度、受光素子５の光軸、指向
性、受光感度及び結像手段９の光学特性などによって決
まる。FIG. 2 is a block diagram when a modulation type photoelectric switch is used in a conventional touchless switch detection device. If it is assumed that an object is present at point A, point B, point C, point D, or point E, the object may be detected at each of those points. The point at which the object can be detected and the point at which the object cannot be detected are determined by the light emitting element 1.
, The directivity, the light emission intensity, the optical axis, directivity, light receiving sensitivity of the light receiving element 5 and the optical characteristics of the imaging means 9.
【０００９】いずれにしても、被検出物を検出できる範
囲は、かなり広く、所定箇所でのみ被検出物を検出でき
るように光電スイッチ（発光素子と受光素子）を設定・
調整することは、困難であった。In any case, the range in which the object can be detected is considerably wide, and the photoelectric switch (light emitting element and light receiving element) is set so that the object can be detected only at a predetermined location.
Coordinating was difficult.
【００１０】[0010]
【発明が解決しようとする課題】本発明は、従来のタッ
チレススイッチの検出装置（変調型光電スイッチ）の欠
点に鑑み為されたもので、その目的とするところは、検
出箇所を狭い範囲に限定させることができるタッチレス
スイッチの検出装置を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of the conventional touchless switch detection device (modulation type photoelectric switch), and its object is to narrow the detection location to a narrow range. It is an object of the present invention to provide a touchless switch detection device that can be limited.
【００１１】[0011]
【課題を解決するための手段】空中に形成される実像を
照射し得る位置に発光素子が設けてあり、結像手段と元
絵との間にハーフミラーが設けてあり、前記発光素子か
ら発した光が被検出物で反射し前記結像手段及び前記ハ
ーフミラーを経て到達し得る位置に受光素子が設けてあ
るタッチレススイッチの検出装置において、パルス変調
信号を出力する発光素子駆動回路を具備させ、前記発光
素子駆動回路が出力するパルス変調信号を二つのパルス
信号に分割する分周回路を設け、２個の発光素子を光軸
が交差するように所定の位置に設け、前記受光素子の後
段に、同期検出回路を設けている。なお、本明細書でい
う同期検出回路は、パルス変調信号を復調する回路を含
む回路を意味するものとする。A light emitting element is provided at a position where a real image formed in the air can be irradiated, and a half mirror is provided between the image forming means and the original picture. A touchless switch detection device in which a light receiving element is provided at a position where the reflected light can be reflected by an object to be detected and reach via the image forming means and the half mirror, including a light emitting element driving circuit for outputting a pulse modulation signal. A frequency dividing circuit that divides a pulse modulation signal output by the light emitting element driving circuit into two pulse signals; two light emitting elements are provided at predetermined positions such that optical axes intersect; A synchronization detection circuit is provided at a subsequent stage. Note that the synchronization detection circuit in this specification means a circuit including a circuit for demodulating a pulse modulation signal.
【００１２】[0012]
【発明の実施の形態】本発明を構成する部材のうち、発
光素子駆動回路、同期検出回路、発光素子及び受光素子
は、変調型の光電スイッチ及びその駆動及び検出回路に
おいて使われているものと同様の構成または部材を使用
すれば、十分である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Among the members constituting the present invention, a light emitting element driving circuit, a synchronization detecting circuit, a light emitting element and a light receiving element are the same as those used in a modulation type photoelectric switch and its driving and detecting circuit. It is sufficient to use similar configurations or components.
【００１３】２個の発光素子は、その光軸が交差するよ
うに所定の位置に設置する。二つの光軸の交点及びその
周囲の空間が被検出物の検出可能範囲となる。The two light emitting elements are set at predetermined positions so that their optical axes intersect. The intersection of the two optical axes and the space around it are the detectable range of the object.
【００１４】図３は、パルス変調信号とその分割された
パルス波形（分周回路出力信号）を示す模式図である。
分周回路は、図３のように、パルス変調信号を二つのパ
ルスに分割し、かつ分周する回路である。分割された一
つのパルス信号は、第一の発光素子を駆動する信号であ
り、もう一つのパルス信号は、第二の発光素子を駆動す
るパルス信号となる。FIG. 3 is a schematic diagram showing a pulse modulation signal and its divided pulse waveform (output signal of a frequency dividing circuit).
The frequency dividing circuit divides the pulse modulation signal into two pulses and divides the frequency as shown in FIG. One of the divided pulse signals is a signal for driving the first light-emitting element, and the other is a pulse signal for driving the second light-emitting element.
【００１５】被検出物の検出可能範囲、すなわち二つの
発光素子の光軸の交点及びその付近に被検出物が存在す
れば、二つの発光素子からの変調光を受光素子は、受光
することができる。同期検出回路は、受光素子の出力に
基づき同期検出及び復調を行い、検出信号を出力する。If the object exists in the detectable range of the object, that is, at the intersection of the optical axes of the two light emitting elements and in the vicinity thereof, the light receiving element can receive the modulated light from the two light emitting elements. it can. The synchronization detection circuit performs synchronization detection and demodulation based on the output of the light receiving element, and outputs a detection signal.
【００１６】[0016]
【実施例】図１は、本発明の一実施例を示す模式図であ
る。第一及び第二の二つの発光素子（１、２）は、光軸
が交差するように設置されており、該光軸の交点が検出
しようとするターゲットとなるように設置位置及び光軸
が調整されている。FIG. 1 is a schematic view showing an embodiment of the present invention. The first and second two light emitting elements (1, 2) are installed so that their optical axes intersect, and the installation position and the optical axis are set such that the intersection of the optical axes becomes a target to be detected. Has been adjusted.
【００１７】発光素子駆動回路３は、発振回路（図示せ
ず）を含んでおり、パルス変調信号を出力する。分周回
路４は、該パルス変調信号を図３のように、分周された
パルス信号のパルスの山が交互に存在するように、パル
ス変調信号を二つに分け、出力する。The light emitting element driving circuit 3 includes an oscillation circuit (not shown) and outputs a pulse modulation signal. The frequency dividing circuit 4 divides the pulse modulated signal into two such that the peaks of the pulse signal of the frequency-divided pulse signal are alternately present as shown in FIG.
【００１８】発光素子（１、２）には、赤外発光ダイオ
ードまたは発光ダイオードなどを使用する。分周された
一つのパルス信号は、第一の発光素子１を発光させ、分
周されたもう一方のパルス信号は、第二の発光素子２を
発光させる。すなわち、発光素子（１、２）は、交互に
発光することになる。As the light emitting elements (1 and 2), an infrared light emitting diode or a light emitting diode is used. One divided pulse signal causes the first light emitting element 1 to emit light, and the other divided pulse signal causes the second light emitting element 2 to emit light. That is, the light emitting elements (1, 2) emit light alternately.
【００１９】受光素子５は、入射してきた光に応じた信
号を同期検出回路６へ出力する。従って、第一の発光素
子１の光軸と第二の発光素子２の光軸が交差する点及び
その周囲にて被検出物で反射してきた二つの発光素子
（１、２）からの変調光は、結像手段９及びハーフミラ
ー１０を経て、受光素子５に入射する。図１では、恐ら
く、点ハとその近辺でしか被検出物を検出できないこと
になる。The light receiving element 5 outputs a signal corresponding to the incident light to the synchronization detecting circuit 6. Therefore, the modulated light from the two light emitting elements (1, 2) reflected by the object at and around the point where the optical axis of the first light emitting element 1 and the optical axis of the second light emitting element 2 intersect. Enters the light receiving element 5 via the imaging means 9 and the half mirror 10. In FIG. 1, the detected object is probably detected only at the point c and its vicinity.
【００２０】受光素子５は、分周される前の元のパルス
変調信号での変調光を受光した場合と同等の信号を出力
することになる。よって、同期検出回路６は、二つの発
光素子（１、２）からの変調信号を同期検出できること
になる。同期検出回路６は、復調回路７を含んでおり、
復調回路は、例えば積分回路、比較回路、出力回路など
からなる（図示せず）。The light receiving element 5 outputs a signal equivalent to the case where modulated light of the original pulse modulated signal before frequency division is received. Therefore, the synchronization detecting circuit 6 can synchronously detect the modulation signals from the two light emitting elements (1, 2). The synchronization detection circuit 6 includes a demodulation circuit 7,
The demodulation circuit includes, for example, an integration circuit, a comparison circuit, an output circuit, and the like (not shown).
【００２１】[0021]
【発明の効果】本発明は、以上説明したように構成され
ているので、次に記載される効果を奏する。一つの発光
素子駆動回路３、一つの受光素子５、一つの同期検出回
路６で、二つの発光素子（１、２）からの変調光を受光
して復調し、検出することができる。二つの発光素子
（１、２）の光軸の交点及びその周囲に被検出物が在っ
た場合のみ、元のパルス変調信号に対し同期検出ができ
るので、検出範囲を狭く所定箇所に限定できる、よって
検出の安定性を高めることができるタッチレススイッチ
の検出装置を提供することができる。Since the present invention is configured as described above, the following effects can be obtained. With one light emitting element driving circuit 3, one light receiving element 5, and one synchronization detecting circuit 6, modulated light from two light emitting elements (1, 2) can be received, demodulated and detected. Only when there is an object to be detected at the intersection of the optical axes of the two light emitting elements (1, 2) and around it, the synchronous detection can be performed with respect to the original pulse modulation signal. Therefore, it is possible to provide a touchless switch detection device capable of improving detection stability.
【図１】本発明の一実施例を示す模式図FIG. 1 is a schematic diagram showing one embodiment of the present invention.
【図２】従来のタッチレススイッチの検出装置に変調型
の光電スイッチを使用した場合のブロック図FIG. 2 is a block diagram when a modulation type photoelectric switch is used in a conventional touchless switch detection device.
【図３】パルス変調信号とその分割されたパルス波形を
示す模式図FIG. 3 is a schematic diagram showing a pulse modulation signal and its divided pulse waveforms.
１ 第一の発光素子 ２ 第二の発光素子 ３ 発光素子駆動回路 ４ 分周回路 ５ 受光素子 ６ 同期検出回路 ７ 復調回路 ８ 元絵 ９ 結像手段 １０ ハーフミラー イ、ロ、ハ、ニ、ホ 発光素子の光軸上の所定位置を示
す点DESCRIPTION OF SYMBOLS 1 First light emitting element 2 Second light emitting element 3 Light emitting element driving circuit 4 Divider circuit 5 Light receiving element 6 Synchronous detection circuit 7 Demodulation circuit 8 Original picture 9 Image forming means 10 Half mirror i, b, c, d, e Point indicating a predetermined position on the optical axis of the light emitting element
Claims (1)
に発光素子が設けてあり、結像手段と元絵との間にハー
フミラーが設けてあり、前記発光素子から発した光が被
検出物で反射し前記結像手段及び前記ハーフミラーを経
て到達し得る位置に受光素子が設けてあるタッチレスス
イッチにおいて、 ２個の発光素子を光軸が交差するように所定の位置に設
け、 パルス変調信号を出力する発光素子駆動回路を具備さ
せ、 前記パルス変調信号を二つのパルス信号に分割し、前記
発光素子へ出力する分周回路を設け、 前記受光素子の後段に、同期検出回路を設けたことを特
徴とするタッチレススイッチの検出装置。A light emitting element is provided at a position capable of irradiating a real image formed in the air, a half mirror is provided between an image forming means and an original picture, and light emitted from the light emitting element is covered by the light emitting element. In a touchless switch in which a light receiving element is provided at a position where the light is reflected by a detection object and can be reached via the imaging means and the half mirror, two light emitting elements are provided at predetermined positions so that optical axes intersect, A light emitting element driving circuit that outputs a pulse modulation signal; a frequency dividing circuit that divides the pulse modulation signal into two pulse signals and outputs the pulse modulation signal to the light emitting element; A touchless switch detection device provided with the touchless switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27322097A JP3796638B2 (en) | 1997-08-29 | 1997-08-29 | Touchless switch detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27322097A JP3796638B2 (en) | 1997-08-29 | 1997-08-29 | Touchless switch detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1174774A true JPH1174774A (en) | 1999-03-16 |
| JP3796638B2 JP3796638B2 (en) | 2006-07-12 |
Family
ID=17524794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27322097A Expired - Fee Related JP3796638B2 (en) | 1997-08-29 | 1997-08-29 | Touchless switch detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3796638B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100747533B1 (en) | 2005-01-10 | 2007-08-08 | 엘지전자 주식회사 | Circuit for controlling input device in the electronic appliance |
-
1997
- 1997-08-29 JP JP27322097A patent/JP3796638B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100747533B1 (en) | 2005-01-10 | 2007-08-08 | 엘지전자 주식회사 | Circuit for controlling input device in the electronic appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3796638B2 (en) | 2006-07-12 |
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