JPH0642915A - Optical measuring apparatus - Google Patents
Optical measuring apparatusInfo
- Publication number
- JPH0642915A JPH0642915A JP16679492A JP16679492A JPH0642915A JP H0642915 A JPH0642915 A JP H0642915A JP 16679492 A JP16679492 A JP 16679492A JP 16679492 A JP16679492 A JP 16679492A JP H0642915 A JPH0642915 A JP H0642915A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- amount
- sources
- measured
- 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.)
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- Measurement Of Optical Distance (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、被測定物の反射光を
利用した測定装置で、例えば、自動車などの障害物検知
センサや車高測定或いはスプリングの撓み量測定、カメ
ラの距離測定などに利用するところの光学的測定装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device using reflected light of an object to be measured, for example, for detecting obstacles such as automobiles, vehicle height, spring deflection, camera distance, etc. It relates to an optical measuring device to be used.
【０００２】[0002]
【従来の技術】被測定物の反射光を利用した測定装置と
して様々な構成のものがあるが、その一例を図８に示
す。１１、１２は、投光手段として備えたＬＥＤなどの
第１光源、第２光源で、これらの光路長には距離ｄの差
がある。１３、１４は、受光手段として備えたフォトダ
イオ−ドなどの受光素子と受光レンズで、１５は拡散反
射面を持つ被測定物である。2. Description of the Related Art There are various measuring devices that utilize reflected light of an object to be measured, and one example thereof is shown in FIG. Reference numerals 11 and 12 denote a first light source and a second light source such as an LED provided as a light projecting means, and there is a difference in distance d between the optical path lengths thereof. Reference numerals 13 and 14 denote a light receiving element such as a photodiode and a light receiving lens provided as light receiving means, and 15 is an object to be measured having a diffuse reflection surface.
【０００３】２つの光源１１、１２より投光された光は
被測定物１５を照射し、この反射光が受光レンズ１４に
より集光され受光素子１３で受光される。第１光源１１
による被測定物１５の照度Ｅ1は、第１光源１１の放射
強度をＩとすると、 Ｅ1＝Ｉ／（ｄ＋Ｄ）2 ・・・・・・・・・・（１） となる。被測定物１５の反射率をρとすると、被測定物
１５の輝度Ｂ1はρＥ1に比例し、比例定数をＫとする
と、 Ｂ1＝ＫρＥ1 ・・・・・・・・・・（２） となる。The light projected from the two light sources 11 and 12 illuminates the object to be measured 15, and the reflected light is collected by the light receiving lens 14 and received by the light receiving element 13. First light source 11
When the radiation intensity of the first light source 11 is I, the illuminance E 1 of the DUT 15 due to the following equation is E 1 = I / (d + D) 2 (1) When the reflectance of the DUT 15 is ρ, the brightness B 1 of the DUT 15 is proportional to ρE 1 , and when the proportional constant is K, B 1 = KρE 1 2)
【０００４】同様に、第２光源１２による発光では、 Ｅ2＝ＩＤ2 ・・・・・・・（３） Ｂ2＝ＫρＥ2 ・・・・・・（４） となる。[0004] Similarly, in the light emission by the second light source 12, the E 2 = ID 2 ······· (3 ) B 2 = KρE 2 ······ (4).
【０００５】次に、反射した光は受光レンズ１４、受光
素子１３により受光され、この測定された輝度Ｂ1、Ｂ2
の比より測定距離Ｄを求める。すなわち、Next, the reflected light is received by the light receiving lens 14 and the light receiving element 13, and the measured brightness B 1 , B 2 is measured.
The measurement distance D is obtained from the ratio of That is,
【数１】 となる。[Equation 1] Becomes
【０００６】これより、測定距離Ｄは反射率ρや比例定
数Ｋに関係なく定数ｄと輝度比（Ｂ2／Ｂ1）とにより求
めることができる。上記した距離Ｄの算出は、この測定
装置に備えた信号処理回路によって行なわれる。From this, the measurement distance D can be obtained from the constant d and the luminance ratio (B 2 / B 1 ) irrespective of the reflectance ρ and the proportional constant K. The above-described calculation of the distance D is performed by the signal processing circuit provided in this measuring device.
【０００７】[0007]
【発明が解決しようとする課題】上記した光学測定装置
は、被測定物の反射率や発光面及び受光面の汚れなどに
影響されることなく測定できる利点を有する反面、投光
する光量の比が変化してしまった場合には正確な距離測
定を行なえないという問題点を有している。The above-mentioned optical measuring device has the advantage that it can be measured without being affected by the reflectance of the object to be measured and the contamination of the light emitting surface and the light receiving surface, but on the other hand, the ratio of the amount of light projected. However, there is a problem in that accurate distance measurement cannot be carried out if the value of the distance changes.
【０００８】つまり、この測定装置は、第１光源１１と
第２光源１２との光量の比を一定とみなして距離Ｄの算
出を行なっているので、例えば、第１光源１１が劣化し
て光量が低下した場合、第２光源１２との間で光量の比
が変化してしまうので、算出された距離が不正確なもの
となる。That is, since the measuring device calculates the distance D by considering the ratio of the light amounts of the first light source 11 and the second light source 12 to be constant, for example, the first light source 11 is deteriorated and the light amount is decreased. When the value decreases, the ratio of the amount of light with the second light source 12 changes, and the calculated distance becomes inaccurate.
【０００９】本発明は、上記した問題点を解決するた
め、２つの光源を常に一定の割合の光量で発光させるこ
とのできるこの種の光学的測定装置の開発を目的とす
る。In order to solve the above-mentioned problems, the present invention has an object of developing an optical measuring device of this kind which can always emit two light sources with a constant amount of light.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、本発明では、２つの光源からの光を光路長を変えて
被測定物に投光する投光手段と、上記２つの光源の近く
でこれら光源から投光された光を受光して光電変換する
光量制御用の第１の受光手段と、被測定物の反射光を受
光して光電変換する測定用の第２の受光手段と、第１の
受光手段によって受光した光源別の光の光電変換信号か
ら上記２つの光源の光量が予め定めた一定の比となるよ
うに少なくとも一方の光源の光量を制御する光量制御手
段と、第２の受光手段によって受光した光源別の光の光
電変換信号から被測定物の輝度比を算出して測定情報を
出力する信号処理手段とより構成したことを特徴とする
光学的測定装置を提案する。In order to achieve the above object, according to the present invention, light projecting means for projecting light from two light sources onto an object to be measured by changing the optical path length, and near the two light sources. A first light receiving means for controlling the amount of light for receiving and photoelectrically converting the light projected from these light sources, and a second light receiving means for measurement for receiving and photoelectrically converting the reflected light of the object to be measured, A light quantity control means for controlling the light quantity of at least one of the light sources so that the light quantity of the two light sources has a predetermined constant ratio from the photoelectric conversion signal of the light for each light source received by the first light receiving means; An optical measuring device is proposed, which comprises a signal processing means for calculating a luminance ratio of an object to be measured from a photoelectric conversion signal of light of each light source received by the light receiving means and outputting measurement information.
【００１１】[0011]
【作用】光路長の異なる２つの光源から被測定物に投光
すると、これらの光源の近くに備えた第１の受光手段が
投光された光を光源別に光電変換する。このように変換
された光電変換信号に基づいて光量制御手段が上記２つ
の光源のうち、少なくとも一方の光源をこれら２つの光
源の光量の比が予め定めた一定の比となるよう制御す
る。これより、被測定物には光量の比が一定となった２
つの光が光路長の差に応じて異なる照度特性で照射され
る。When light is projected onto the object to be measured from two light sources having different optical path lengths, the first light receiving means provided near these light sources photoelectrically convert the projected light for each light source. Based on the photoelectrically converted signal thus converted, the light amount control means controls at least one of the two light sources so that the ratio of the light amounts of these two light sources becomes a predetermined constant ratio. As a result, the ratio of the amount of light to the measured object became constant.
Two lights are emitted with different illuminance characteristics depending on the difference in optical path length.
【００１２】被測定物に照射さた２つの光はその反射光
が第２の受光手段によって受光されて光源別の光の光電
変換信号となる。そして、この光電変換信号に基づいて
信号処理手段が被測定物の輝度比を算出して測定情報を
出力する。The reflected light of the two lights applied to the object to be measured is received by the second light receiving means and becomes a photoelectric conversion signal of the light for each light source. Then, the signal processing means calculates the luminance ratio of the object to be measured based on the photoelectric conversion signal and outputs the measurement information.
【００１３】[0013]
【実施例】次に、本発明の実施例について図面に沿って
説明する。図１は、本発明の第１実施例を示し、この実
施例における投光手段と第１、第２の受光手段の簡略図
である。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, and is a simplified view of a light projecting means and first and second light receiving means in this embodiment.
【００１４】光路長に距離ｄの差をもって配置したＬＥ
Ｄなどの第１光源５０と第２光源５１とで投光手段を構
成し、これら第１光源５０と第２光源５１の近くには各
々斜め方向から各光源５０、５１に向けるようにして配
置した第１の受光手段としての受光素子５２、５３が設
けられている。LEs arranged with a difference of the distance d in the optical path length
A first light source 50 such as D and a second light source 51 constitute a light projecting means, and the first light source 50 and the second light source 51 are arranged near the first light source 50 and the second light source 51 so as to face the respective light sources 50, 51 in an oblique direction. The light receiving elements 52 and 53 as the first light receiving means are provided.
【００１５】被測定物５４は、拡散反射面を備えてお
り、第１光源５０から距離Ｄ＋ｄだけ離れ、また、第２
光源５１から距離Ｄだけ離れて配置されている。The object 54 to be measured is provided with a diffuse reflection surface and is separated from the first light source 50 by a distance D + d, and the second
It is arranged at a distance D from the light source 51.
【００１６】また、受光レンズ５５と受光素子５６から
なる第２の受光手段を設け、この第２の受光手段で被測
定物５４からの反射光を受光するようになっている。上
記した受光素子５２、５３及び５６にはフォトダイオ−
ドが用いられている。A second light receiving means including a light receiving lens 55 and a light receiving element 56 is provided, and the second light receiving means receives the reflected light from the object 54 to be measured. The photo detectors 52, 53, and 56 described above have photodiodes.
Is used.
【００１７】２つの光源５０、５１より光が投光される
と、第１光源５０の光の一部を受光素子５２が受光し、
第２光源５１の光の一部を受光素子５３が受光する。そ
して、受光素子５２、５３は各々受光した光を電気信号
に変換して出力信号を発生する。この出力信号は、測定
装置に備えた後述する光量制御回路５７に取り込まれ
る。When light is projected from the two light sources 50 and 51, a part of the light from the first light source 50 is received by the light receiving element 52,
The light receiving element 53 receives a part of the light of the second light source 51. The light receiving elements 52 and 53 convert the received light into electric signals and generate output signals. This output signal is taken in by a light amount control circuit 57, which will be described later, provided in the measuring device.
【００１８】光量制御回路５７は、第１光源５０と第２
光源５１との光量の比を算出し、この光量の比が予め定
めた一定の比とならない場合、第２光源５１の光量を変
化させて一定の比を保つように制御する。The light quantity control circuit 57 includes a first light source 50 and a second light source 50.
The ratio of the amount of light to the light source 51 is calculated, and when the ratio of the amount of light does not reach a predetermined constant ratio, the amount of light of the second light source 51 is changed so as to maintain the constant ratio.
【００１９】なお、この光量制御回路５７は、第１光源
５０と第２光源５１との光量の比を１：１と定めてあ
る。The light quantity control circuit 57 defines the light quantity ratio between the first light source 50 and the second light source 51 to be 1: 1.
【００２０】以下、図２をもって光量制御回路５７につ
いて説明する。受光素子５２、５３から出力された光電
変換電流Ｉｐ、Ｉｓは増幅器５８、５９に送られて増幅
された後、整流平滑回路６０、６１で整流され平滑され
る。整流平滑された各々の出力電流Ｉｐ、Ｉｓは対数変
換回路６２、６３で電圧Ｖｐ、Ｖｓに変換されると共に
対数変換される。The light amount control circuit 57 will be described below with reference to FIG. The photoelectric conversion currents Ip and Is output from the light receiving elements 52 and 53 are sent to the amplifiers 58 and 59, amplified, and then rectified and smoothed by the rectifying and smoothing circuits 60 and 61. The rectified and smoothed output currents Ip and Is are converted into voltages Vp and Vs and logarithmically converted by logarithmic conversion circuits 62 and 63.
【００２１】対数変換された電圧Ｖｐ、Ｖｓは差動増幅
器６４に入力されて電圧差が算出され、この電圧差が電
流制御回路６５に送られる。電流制御回路６５は、上記
した電圧差にもとづいてこの電圧差がゼロとなるように
第２光源５１の発光出力を制御する。The logarithmically converted voltages Vp and Vs are input to the differential amplifier 64, the voltage difference is calculated, and the voltage difference is sent to the current control circuit 65. The current control circuit 65 controls the light emission output of the second light source 51 based on the above voltage difference so that the voltage difference becomes zero.
【００２２】例えば、第２光源５１の光量が第１光源５
０の光量に比べて多い場合、電流制御回路６５は第２光
源５１を暗くするように第２光源５１の電力増幅器６６
を駆動する。そして、第１光源５０の光と第２光源５１
の光とが受光素子５２、５３によって受光され、これら
光源の光量が同じになるように上記と同様にして光量制
御される。差動増幅器６４で算出された電圧差がゼロと
なったとき、電流制御回路６５の制御が停止する。For example, the amount of light of the second light source 51 is equal to that of the first light source 5.
When the amount of light is greater than 0, the current control circuit 65 causes the power amplifier 66 of the second light source 51 to darken the second light source 51.
To drive. Then, the light of the first light source 50 and the second light source 51
Light is received by the light receiving elements 52 and 53, and the light amount is controlled in the same manner as described above so that the light amounts of these light sources become the same. When the voltage difference calculated by the differential amplifier 64 becomes zero, the control of the current control circuit 65 stops.
【００２３】一方、第２光源５１の光量が第１光源５０
の光量に比べて少ない場合、上記とは逆に電流制御回路
６５が第２光源５１を明るくするように電力増幅器６６
を駆動する。電流制御回路６５による制御は、上記した
電圧差がゼロとなるまで続けられる。On the other hand, the light quantity of the second light source 51 is equal to that of the first light source 50.
In contrast to the above, the current control circuit 65 makes the second light source 51 brighter, conversely to the above.
To drive. The control by the current control circuit 65 is continued until the above voltage difference becomes zero.
【００２４】これより、２つの光源５０、５１から投光
する光は等しい光となって被測定物５４を照射する。な
お、図２において、６７は第１光源５０の電力増幅器、
６８は主コントロ−ラである。As a result, the light projected from the two light sources 50 and 51 becomes the same light and illuminates the object 54 to be measured. In FIG. 2, 67 is a power amplifier of the first light source 50,
68 is a main controller.
【００２５】被測定物５４の反射光は受光レンズ５５に
より集光され受光素子５６で受光される。受光素子５６
は受光した光を電気信号に変換して出力信号を発生し、
この出力信号は主コントロ−ラ６８に含まれた信号処理
回路に取り込まれ、被測定物５４の輝度比から測定距離
Ｄが算出される。The reflected light of the object 54 to be measured is condensed by the light receiving lens 55 and received by the light receiving element 56. Light receiving element 56
Converts the received light into an electrical signal to generate an output signal,
This output signal is taken into the signal processing circuit included in the main controller 68, and the measurement distance D is calculated from the luminance ratio of the DUT 54.
【００２６】図３は主コントロ−ラ６８に含まれた信号
処理回路の一例を示すブロック図である。FIG. 3 is a block diagram showing an example of a signal processing circuit included in the main controller 68.
【００２７】発振器７０の出力パルスは発光切換回路７
１によって第１光源５０の電力増幅器６７と第２光源５
１の電力増幅器６６とに交互に送られ、２つの光源５
０、５１を交互に発光させる。The output pulse of the oscillator 70 is a light emission switching circuit 7.
1, the power amplifier 67 of the first light source 50 and the second light source 5
1 power amplifier 66 and two light sources 5
0 and 51 are alternately emitted.
【００２８】また、発光切換回路７１は上記した発振器
７０の出力パルスにしたがって受光のタイミングをとる
ための同期信号を受光切換回路７２に送る。第１光源５
０と第２光源５１との発光により被測定物５４を照射
し、被測定物５４の反射光が受光素子５６で受光される
と、この反射光が光電変換されてその受光信号が増幅器
７３で増幅され、受光切換回路７２に伝えられる。Further, the light emission switching circuit 71 sends to the light reception switching circuit 72 a synchronizing signal for timing the light reception according to the output pulse of the oscillator 70. First light source 5
0 and the second light source 51 illuminate the object to be measured 54, and when the reflected light of the object to be measured 54 is received by the light receiving element 56, this reflected light is photoelectrically converted, and the received light signal is amplified by the amplifier 73. It is amplified and transmitted to the light receiving switching circuit 72.
【００２９】この受光切換回路７２では、上記した発光
切換回路７１からの同期信号により第１光源５０若しく
は第２光源５１のどちらかが発光されたかを判別し、こ
れにしたがい、第１演算回路７４または第２演算回路７
５に受光信号を送る。The light receiving switching circuit 72 determines whether the first light source 50 or the second light source 51 emits light based on the synchronization signal from the light emitting switching circuit 71, and accordingly, the first arithmetic circuit 74 is operated. Or the second arithmetic circuit 7
A light receiving signal is sent to 5.
【００３０】この受光信号にもとづき、これら第１演算
回路７４、第２演算回路７５で各々第１光源５０におけ
る被測定物５４の輝度Ｂ1と第２光源５１における被測
定物５４の輝度Ｂ2を求める演算を行ない、この結果を
処理回路７６に伝えて輝度比（Ｂ2／Ｂ1）の演算処理が
行なわれ、測定距離Ｄに関する出力信号が出力端子７７
より出力される。Based on the received light signal, the brightness B 1 of the object 54 to be measured in the first light source 50 and the brightness B 2 of the object 54 to be measured in the second light source 51 are respectively calculated by the first arithmetic circuit 74 and the second arithmetic circuit 75. Is calculated, the result is transmitted to the processing circuit 76, and the brightness ratio (B 2 / B 1 ) is calculated, and an output signal related to the measured distance D is output to the output terminal 77.
Will be output.
【００３１】図４及び図５は本発明の第２実施例を示
し、図４はこの実施例における投光手段と第１、第２の
受光手段の簡略図であり、図５は光量制御回路のブロッ
ク図である。なお、本実施例の説明の中で第１実施例と
同一部材及び回路については同一符号を付してその説明
を省略する。FIGS. 4 and 5 show a second embodiment of the present invention, FIG. 4 is a simplified diagram of the light projecting means and the first and second light receiving means in this embodiment, and FIG. 5 is a light quantity control circuit. It is a block diagram of. In the description of this embodiment, the same members and circuits as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００３２】この実施例は、第１の受光手段を１つの受
光素子７８で構成して部品点数を減らし、装置構成を簡
素化たものである。In this embodiment, the first light receiving means is composed of one light receiving element 78, the number of parts is reduced, and the apparatus structure is simplified.
【００３３】第１光源５０と第２光源５１とは上述した
信号処理回路によって交互に発光する。そして、発光し
た各々の光の一部を受光素子７８が受光して電気信号に
変換し、この変換した信号にもとづいて光量制御回路７
９が第１光源５０と第２光源５１の光量の差を算出し、
この差に応じて第２光源５１の光量を第１光源５０の光
量と等しくするよう変化させる。なお、この光量制御回
路７９についても、第１光源５０と第２光源５１との光
量の比を１：１と定めてある。The first light source 50 and the second light source 51 emit light alternately by the signal processing circuit described above. Then, the light receiving element 78 receives a part of each emitted light and converts it into an electric signal, and based on the converted signal, the light amount control circuit 7
9 calculates the difference between the light amounts of the first light source 50 and the second light source 51,
According to this difference, the light amount of the second light source 51 is changed to be equal to the light amount of the first light source 50. In this light amount control circuit 79 as well, the ratio of the light amounts of the first light source 50 and the second light source 51 is set to 1: 1.
【００３４】受光素子７８から出力された光電変換電流
Ｉｐ、Ｉｓは増幅器８０で増幅された後、対数増幅器８
１で電圧Ｖｐ、Ｖｓに変換されると共に対数変換され
る。対数変換された電圧Ｖｐ、Ｖｓは第１光源５０の発
光によるものと、第２光源５１の発光によるものとに分
離器８３によって分離され、各々整流平滑回路８４、８
５で整流平滑された後、差動増幅器８６に入力され、こ
の差動増幅器８６で電圧差が算出される。そして、この
電圧差にもとづいて電流制御回路８７が第２光源５１の
電力増幅器８８を駆動し、第２光源５１の光量が第１光
源５０の光量に等しくなるまで制御する。The photoelectric conversion currents Ip and Is output from the light receiving element 78 are amplified by the amplifier 80, and then the logarithmic amplifier 8
At 1, it is converted into voltages Vp and Vs, and also logarithmically converted. The logarithmically converted voltages Vp and Vs are separated by a separator 83 into a light emission from the first light source 50 and a light emission from the second light source 51, and rectifying and smoothing circuits 84 and 8 respectively.
After being rectified and smoothed by 5, the voltage is input to the differential amplifier 86, and the voltage difference is calculated by the differential amplifier 86. Then, the current control circuit 87 drives the power amplifier 88 of the second light source 51 based on this voltage difference, and controls until the light quantity of the second light source 51 becomes equal to the light quantity of the first light source 50.
【００３５】このようにして光量制御された第１光源５
０、第２光源５１の光は、第１実施例と同様にして被測
定物５４に照射され、その反射光が受光レンズ５５によ
り集光されて受光素子５６で受光される。そして、受光
素子５６の出力信号にもとづいて信号処理回路が測定距
離Ｄを算出する。なお、図５中の符号８９は第１光源５
０の電力増幅器である。The first light source 5 whose light quantity is controlled in this way
0, the light from the second light source 51 is applied to the DUT 54 in the same manner as in the first embodiment, and the reflected light is collected by the light receiving lens 55 and received by the light receiving element 56. Then, the signal processing circuit calculates the measurement distance D based on the output signal of the light receiving element 56. Reference numeral 89 in FIG. 5 indicates the first light source 5
0 power amplifier.
【００３６】次に、本発明の第３実施例について説明す
る。図６は光量制御回路を示すブロック図であり、この
実施例における投光手段と第１、第２の受光手段につい
ては第１実施例の図１で示す構成と同様のものとなって
いる。また、本実施例の説明の中で、第１実施例と同一
部材及び回路については同一符号を付してその説明を省
略する。Next, a third embodiment of the present invention will be described. FIG. 6 is a block diagram showing a light quantity control circuit, and the light projecting means and the first and second light receiving means in this embodiment are the same as those shown in FIG. 1 of the first embodiment. Further, in the description of the present embodiment, the same members and circuits as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
【００３７】この実施例は、第１光源５０の光量を第２
光源５１の光量より大きいものとし、これら２つの光源
５０、５１を予め定めた一定の割合の光量で発光させる
ものである。例えば、第２光源５１の光量が第１光源５
０の光量の１／２とすると、常にこの割合を保つように
光量制御回路９０が第２光源５１の光量を制御する。In this embodiment, the light amount of the first light source 50 is changed to the second light amount.
It is assumed that the light amount of the light source 51 is larger than that of the light source 51, and these two light sources 50 and 51 are caused to emit light at a predetermined constant rate of light amount. For example, if the light amount of the second light source 51 is the first light source 5
When the light amount is 1/2 of 0, the light amount control circuit 90 controls the light amount of the second light source 51 so that this ratio is always maintained.
【００３８】第１光源５０と第２光源５１との光量の割
合を上記した２：１とすると、第１光源５０から発光さ
れた光を受光する受光素子５２の出力信号は、ポテンシ
ョメ−タ９１で１／２のデ−タ信号に変換され差動増幅
器９２に入力される。また、第２光源５１から発光され
た光を受光する受光素子５３の出力信号は、そのままの
デ−タ信号として差動増幅器９２に入力される。When the ratio of the light amounts of the first light source 50 and the second light source 51 is 2: 1 as described above, the output signal of the light receiving element 52 which receives the light emitted from the first light source 50 is a potentiometer. It is converted into a 1/2 data signal at 91 and input to the differential amplifier 92. Further, the output signal of the light receiving element 53 that receives the light emitted from the second light source 51 is input to the differential amplifier 92 as a data signal as it is.
【００３９】そして、差動増幅器９２はこれらデ−タ信
号からその差を算出し、差信号を電流制御回路９３に送
る。ここで、上記した差信号がゼロの場合、第１光源５
０と第２光源５１との光量は予め定た２：１の割合とな
るので、第２光源５１の発光出力は正常のものとなる。Then, the differential amplifier 92 calculates the difference from these data signals and sends the difference signal to the current control circuit 93. Here, when the difference signal is zero, the first light source 5
The light amounts of 0 and the second light source 51 have a predetermined ratio of 2: 1, so that the light emission output of the second light source 51 becomes normal.
【００４０】一方、差信号がゼロから変動した場合、こ
の変動分に応じて電流制御回路９３が第２光源５１の電
力増幅器９４を駆動させて第２光源５１の光量を変化さ
せる。この電流制御回路９３の制御は、差信号がゼロと
なるまで続けられる。これより、被測定物５４を照射す
る第１光源５０と第２光源５１の光量は常に２：１の割
合となる。On the other hand, when the difference signal fluctuates from zero, the current control circuit 93 drives the power amplifier 94 of the second light source 51 according to the fluctuation amount to change the light amount of the second light source 51. The control of the current control circuit 93 is continued until the difference signal becomes zero. As a result, the light amounts of the first light source 50 and the second light source 51 which irradiate the DUT 54 are always 2: 1.
【００４１】なお、図６中の符号９５、９６は増幅器、
９７、９８は整流平滑器、９９は第１光源５０の電力増
幅器である。Reference numerals 95 and 96 in FIG. 6 are amplifiers,
97 and 98 are rectifying / smoothing devices, and 99 is a power amplifier of the first light source 50.
【００４２】上記した第１、第２、第３実施例は共に第
１光源５０の光量に合わせて第２光源５１の光量を制御
する構成のものとなっているが、次に、第１光源５０及
び第２光源５１の両方の光量を制御することのできる光
量制御回路を備えた実施例について説明する。The above-mentioned first, second and third embodiments all have a structure in which the light quantity of the second light source 51 is controlled according to the light quantity of the first light source 50. An embodiment including a light amount control circuit capable of controlling the light amounts of both the light source 50 and the second light source 51 will be described.
【００４３】図７は本発明の第４実施例を示す光量制御
回路のブロック図である。この実施例における投光手段
と第１、第２の受光手段についても第１実施例の図１で
示す構成と同様のものとなっている。また、本実施例の
説明の中で、第１実施例と同一部材及び回路については
同符号を付してその説明を省略する。FIG. 7 is a block diagram of a light quantity control circuit showing a fourth embodiment of the present invention. The light projecting means and the first and second light receiving means in this embodiment also have the same configuration as that of the first embodiment shown in FIG. In the description of this embodiment, the same members and circuits as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
【００４４】この光量制御回路１０１においては、第１
光源５０と第２光源５１とが予め定めた一定の光量の割
合で発光するものとし、また、第１光源５０の光量を第
２光源５１の光量より大きいものとする。In the light quantity control circuit 101, the first
It is assumed that the light source 50 and the second light source 51 emit light at a predetermined constant light amount ratio, and the light amount of the first light source 50 is larger than the light amount of the second light source 51.
【００４５】例えば、第３実施例と同様に第２光源５１
の光量が第１光源５０の光量の１／２とすると、第１光
源５０から発光された光を受光する受光素子５２の出力
信号がポテンショメ−タ１０２で１／２のデ−タ信号に
変換され差動増幅器１０３に入力される。For example, as in the third embodiment, the second light source 51
Is 1/2 of the light amount of the first light source 50, the output signal of the light receiving element 52 that receives the light emitted from the first light source 50 becomes a 1/2 data signal by the potentiometer 102. It is converted and input to the differential amplifier 103.
【００４６】また、第２光源５１から発光された光を受
光する受光素子５３の出力信号は、そのままのデ−タ信
号として差動増幅器１０３に入力される。そして、差動
増幅器１０３は、この２つのデ−タ信号からその差を算
出し、差信号を電流制御回路１０４に送る。The output signal of the light receiving element 53 which receives the light emitted from the second light source 51 is input to the differential amplifier 103 as a data signal as it is. Then, the differential amplifier 103 calculates the difference between these two data signals and sends the difference signal to the current control circuit 104.
【００４７】このとき、差動増幅器１０３は、上記した
算出結果が＋のとき、すなわち、第１光源５０の光量が
第２光源５１の光量の２倍以上となったとき、＋の信号
を電流制御回路１０４に送る。At this time, the differential amplifier 103 outputs a + signal as a current when the above-mentioned calculation result is +, that is, when the light amount of the first light source 50 is more than twice the light amount of the second light source 51. It is sent to the control circuit 104.
【００４８】また、上記した算出結果が−のとき、すな
わち、第１光源５０の光量が第２光源５１の光量の２倍
以下となったとき、−の信号を同様に電流制御回路１０
４に送る。When the above calculation result is negative, that is, when the light quantity of the first light source 50 is less than or equal to twice the light quantity of the second light source 51, a signal of-is similarly given to the current control circuit 10.
Send to 4.
【００４９】そして、電流制御回路１０４は＋の信号を
受けた場合、第１光源５０の電力増幅器１０５を駆動さ
せて第１光源５０の光量を減少させる。また、電流制御
回路１０４が−の信号を受けた場合、第２光源５１の電
力増幅器１０６を駆動させて第２光源５１の光量を減少
させる。When receiving the + signal, the current control circuit 104 drives the power amplifier 105 of the first light source 50 to reduce the light amount of the first light source 50. Further, when the current control circuit 104 receives a signal of −, the power amplifier 106 of the second light source 51 is driven to reduce the light amount of the second light source 51.
【００５０】この電流制御回路１０４の制御は、差信号
がゼロとなるまで続けられる。これより、被測定物５４
を照射する第１光源５０と第２光源５１の光量は常に
２：１の割合となる。The control of the current control circuit 104 is continued until the difference signal becomes zero. From this, the measured object 54
The light amounts of the first light source 50 and the second light source 51 for irradiating the light are always in a ratio of 2: 1.
【００５１】このように構成することにより、２つの光
源５０、５１は、一方の光源が暗くなった場合、この暗
くなった光源に合わせて他方の光源の光量が制御される
ので、光源の寿命を延ばすことができ、装置の耐久性が
向上する。なお、図７中の符号１０７、１０８は増幅
器、１０９、１１０は整流平滑回路である。With this configuration, when one of the two light sources 50 and 51 becomes dark, the light amount of the other light source is controlled in accordance with the darkened light source, so that the life of the light source becomes longer. Can be extended and the durability of the device is improved. In FIG. 7, reference numerals 107 and 108 are amplifiers, and 109 and 110 are rectifying and smoothing circuits.
【００５２】なお、上記した各実施例では、第１光源５
０と第２光源５１とを交互に発光させるタイプの光学的
測定装置に関して説明したが、周波数や波長を変えた光
を同時に発光するようにした第１、第２光源を備えた光
学的測定装置についても同様に実施し得る。In each of the above embodiments, the first light source 5
Although the optical measuring device of the type in which 0 and the second light source 51 are alternately emitted has been described, the optical measuring device provided with the first and second light sources that simultaneously emit light with different frequencies and wavelengths. Can be similarly implemented.
【００５３】また、第１、第２実施例では、第１光源５
０と第２光源５１との光量の比を１：１と定めたが、必
ずしも光量比をこのように定めることはなく、受光素子
５２、５３の増幅器５８、５９、受光素子５６の増幅器
７３の増幅率を変えて、これら受光素子５２、５３、５
６が出力する光源別の出力信号を１：１の割合とするよ
うに構成してもよい。In the first and second embodiments, the first light source 5
Although the ratio of the amount of light between 0 and the second light source 51 is set to 1: 1, the ratio of the amount of light is not necessarily determined in this way. These light receiving elements 52, 53, 5 are changed by changing the amplification factor.
It may be configured such that the output signals of the respective light sources output by 6 have a ratio of 1: 1.
【００５４】このようなことは、第３、第４実施例につ
いても同様であり、受光素子５２、５３の増幅器９５、
９６、受光素子５６の増幅器７３の増幅率を変えて、こ
れら増幅器が出力する光源別の出力信号を２：１の割合
とすれば、必ずしも第１光源５０と第２光源５１の光量
比を１／２にしなくてもよい。The same applies to the third and fourth embodiments, and the amplifiers 95 of the light receiving elements 52 and 53,
96, if the amplification factor of the amplifier 73 of the light receiving element 56 is changed so that the output signal for each light source output by these amplifiers has a ratio of 2: 1, the light quantity ratio of the first light source 50 and the second light source 51 is not necessarily 1 It does not have to be / 2.
【００５５】[0055]
【発明の効果】上記した通り、本発明に係る光学的測定
装置は、２つの光源の近くでこれら光源の光を受光し
て、光源別の光の光電変換信号を出力する光量制御用の
第１の受光手段と、この光源別の光の光電変換信号から
上記２つの光源の光量が予め定めた一定の比となるよう
に上記２つの光源のうち少なくとも一方の光源の光量を
制御する光量制御手段とを備えて構成したので、被測定
物には常に光量の比が一定となった２つの光を照射する
ことができる。As described above, the optical measuring device according to the present invention receives light from two light sources in the vicinity of the two light sources and outputs a photoelectric conversion signal of the light for each light source. 1 light receiving means and light quantity control for controlling the light quantity of at least one of the two light sources so that the light quantity of the two light sources becomes a predetermined constant ratio from the photoelectric conversion signal of the light for each light source. Since it is configured by including the means, it is possible to irradiate the object to be measured with two lights having a constant light amount ratio.
【００５６】これによって、一方の光源が劣化して光量
が低下した場合でも、被測定物までの距離を正確に算出
することができ極めて信頼性の高い測定装置となる。As a result, even if one of the light sources deteriorates and the amount of light decreases, the distance to the object to be measured can be accurately calculated, resulting in a highly reliable measuring device.
【図１】本発明の第１実施例を示し、この実施例の測定
装置に備えた投光手段と第１、第２の受光手段の簡略図
である。FIG. 1 shows a first embodiment of the present invention, and is a simplified diagram of a light projecting means and first and second light receiving means provided in a measuring apparatus of this embodiment.
【図２】第１実施例における光量制御回路を示すブロッ
ク図である。FIG. 2 is a block diagram showing a light amount control circuit in the first embodiment.
【図３】第１実施例における信号処理回路を示すブロッ
ク図である。FIG. 3 is a block diagram showing a signal processing circuit in the first embodiment.
【図４】本発明の第２実施例を示し、この実施例の測定
装置に備えた投光手段と第１、第２の受光手段の簡略図
である。FIG. 4 shows a second embodiment of the present invention, and is a simplified diagram of the light projecting means and the first and second light receiving means provided in the measuring apparatus of this embodiment.
【図５】第２実施例における光量制御回路を示すブロツ
ク図である。FIG. 5 is a block diagram showing a light quantity control circuit in the second embodiment.
【図６】本発明の第３実施例の光量制御回路を示すブロ
ック図である。FIG. 6 is a block diagram showing a light amount control circuit according to a third embodiment of the present invention.
【図７】本発明の第４実施例の光量制御回路を示すブロ
ック図である。FIG. 7 is a block diagram showing a light amount control circuit according to a fourth embodiment of the present invention.
【図８】従来例として示した光学的測定装置の投光手段
と受光手段の簡略図である。FIG. 8 is a simplified diagram of a light projecting unit and a light receiving unit of an optical measuring device shown as a conventional example.
５０ 第１光源 ５１ 第２光源 ５２ 受光素子 ５３ 受光素子 ５４ 被測定物 ５５ 受光レンズ ５６ 受光素子 ５７ 光量制御回路 ７８ 受光素子 ７９、９０、１０１ 光量制御回路 50 first light source 51 second light source 52 light receiving element 53 light receiving element 54 object to be measured 55 light receiving lens 56 light receiving element 57 light quantity control circuit 78 light receiving elements 79, 90, 101 light quantity control circuit
Claims (1)
測定物に投光する投光手段と、上記２つの光源の近くで
これら光源から投光された光を受光して光電変換する光
量制御用の第１の受光手段と、被測定物の反射光を受光
して光電変換する測定用の第２の受光手段と、第１の受
光手段によって受光した光源別の光の光電変換信号から
上記２つの光源の光量が予め定めた一定の比となるよう
に少なくとも一方の光源の光量を制御する光量制御手段
と、第２の受光手段によって受光した光源別の光の光電
変換信号から被測定物の輝度比を算出して測定情報を出
力する信号処理手段とより構成したことを特徴とする光
学的測定装置。1. Light projecting means for projecting light from two light sources onto an object to be measured by changing optical path lengths, and photoelectric conversion for receiving light projected from these light sources near the two light sources. First light receiving means for controlling the amount of light, second light receiving means for measurement that receives and photoelectrically converts the reflected light of the object to be measured, and photoelectric conversion of light for each light source received by the first light receiving means From a signal, a light amount control means for controlling the light amount of at least one of the light sources so that the light amount of the two light sources has a predetermined constant ratio, and a photoelectric conversion signal of light of each light source received by the second light receiving means. An optical measuring device comprising: a signal processing unit that calculates a luminance ratio of an object to be measured and outputs measurement information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16679492A JPH0642915A (en) | 1992-06-03 | 1992-06-03 | Optical measuring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16679492A JPH0642915A (en) | 1992-06-03 | 1992-06-03 | Optical measuring apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0642915A true JPH0642915A (en) | 1994-02-18 |
Family
ID=15837803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16679492A Pending JPH0642915A (en) | 1992-06-03 | 1992-06-03 | Optical measuring apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0642915A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304821A (en) * | 2000-02-16 | 2001-10-31 | Fuji Photo Film Co Ltd | Image pickup apparatus and range measuring method |
| JP2012037264A (en) * | 2010-08-04 | 2012-02-23 | Seiko Epson Corp | Optical position detection device and apparatus with position detection function |
| JP2012037263A (en) * | 2010-08-04 | 2012-02-23 | Seiko Epson Corp | Optical position detection device and device having position detection function |
| US8735825B2 (en) | 2011-04-08 | 2014-05-27 | Seiko Epson Corporation | Optical position detection device |
| WO2014174779A1 (en) * | 2013-04-26 | 2014-10-30 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor apparatus having a plurality of light sources |
| WO2014208087A1 (en) * | 2013-06-27 | 2014-12-31 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor device having plurality of light sources |
| WO2015001770A1 (en) * | 2013-07-01 | 2015-01-08 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor device having plurality of light sources |
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| JPS58202385A (en) * | 1983-01-26 | 1983-11-25 | Hitachi Ltd | Oil supply mechanism for closed compressor |
| JPH0493706A (en) * | 1990-08-10 | 1992-03-26 | Stanley Electric Co Ltd | Optical measuring apparatus |
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| JPS58202385A (en) * | 1983-01-26 | 1983-11-25 | Hitachi Ltd | Oil supply mechanism for closed compressor |
| JPH0493706A (en) * | 1990-08-10 | 1992-03-26 | Stanley Electric Co Ltd | Optical measuring apparatus |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001304821A (en) * | 2000-02-16 | 2001-10-31 | Fuji Photo Film Co Ltd | Image pickup apparatus and range measuring method |
| JP2012037264A (en) * | 2010-08-04 | 2012-02-23 | Seiko Epson Corp | Optical position detection device and apparatus with position detection function |
| JP2012037263A (en) * | 2010-08-04 | 2012-02-23 | Seiko Epson Corp | Optical position detection device and device having position detection function |
| US8735825B2 (en) | 2011-04-08 | 2014-05-27 | Seiko Epson Corporation | Optical position detection device |
| WO2014174779A1 (en) * | 2013-04-26 | 2014-10-30 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor apparatus having a plurality of light sources |
| US9978148B2 (en) | 2013-04-26 | 2018-05-22 | Panasonic Intellectual Property Corporation Of America | Motion sensor apparatus having a plurality of light sources |
| JPWO2014174779A1 (en) * | 2013-04-26 | 2017-02-23 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Motion sensor device having a plurality of light sources |
| JPWO2014208087A1 (en) * | 2013-06-27 | 2017-02-23 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Motion sensor device having a plurality of light sources |
| WO2014208087A1 (en) * | 2013-06-27 | 2014-12-31 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor device having plurality of light sources |
| US9863767B2 (en) | 2013-06-27 | 2018-01-09 | Panasonic Intellectual Property Corporation Of America | Motion sensor device having plurality of light sources |
| WO2015001770A1 (en) * | 2013-07-01 | 2015-01-08 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Motion sensor device having plurality of light sources |
| CN104603574B (en) * | 2013-07-01 | 2017-10-13 | 松下电器（美国）知识产权公司 | Motion sensor device with multiple light sources |
| JPWO2015001770A1 (en) * | 2013-07-01 | 2017-02-23 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカＰａｎａｓｏｎｉｃ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｃｏｒｐｏｒａｔｉｏｎ ｏｆ Ａｍｅｒｉｃａ | Motion sensor device having a plurality of light sources |
| CN104603574A (en) * | 2013-07-01 | 2015-05-06 | 松下电器（美国）知识产权公司 | Motion sensor device having plurality of light sources |
| US10313599B2 (en) | 2013-07-01 | 2019-06-04 | Panasonic Intellectual Property Corporation Of America | Motion sensor device having plurality of light sources |
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