JPH01140116U - - Google Patents
Info
- Publication number
- JPH01140116U JPH01140116U JP3695188U JP3695188U JPH01140116U JP H01140116 U JPH01140116 U JP H01140116U JP 3695188 U JP3695188 U JP 3695188U JP 3695188 U JP3695188 U JP 3695188U JP H01140116 U JPH01140116 U JP H01140116U
- Authority
- JP
- Japan
- Prior art keywords
- current
- distance
- brightness
- signal light
- value
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 1
Landscapes
- Measurement Of Optical Distance (AREA)
- Focusing (AREA)
Description
第１図は本考案の一実施例である測距装置の信
号処理系を示す回路図、第２図は従来の測距装置
の光学系を示す模式図、第３図は従来の測距装置
の信号処理系を示す回路図である。
２０……ＰＳＤ（光電素子）、２２……電流除
去回路、２３……ＮＰＮトランジスタ（スイツチ
ング素子）、２４，２５……抵抗、２６……ＮＰ
Ｎトランジスタ、２７……抵抗値切換え回路、２
８……フオトダイオード（輝度検出手段）。
Fig. 1 is a circuit diagram showing a signal processing system of a distance measuring device which is an embodiment of the present invention, Fig. 2 is a schematic diagram showing an optical system of a conventional distance measuring device, and Fig. 3 is a conventional distance measuring device. FIG. 2 is a circuit diagram showing a signal processing system of FIG. 20...PSD (photoelectric device), 22...Current removal circuit, 23...NPN transistor (switching element), 24, 25...Resistor, 26...NP
N transistor, 27...Resistance value switching circuit, 2
8...Photodiode (brightness detection means).
Claims (1)
と、被測距物体からの反射光を受光して電流に変
換する光電素子とを含み、信号光を含む被測距物
体からの反射光を受光して前記光電素子が変換す
る電流のうちから信号光に対応しない大部分の電
流を除去する、相互に直列なスイツチング素子と
抵抗とを備える電流除去回路を通じて除去し、信
号光に対応する電流分を含む残りの電流に基づき
被測距物体までの距離を測定するようにした測距
装置において、 被測距物体の輝度を検出する輝度検出手段と、 この輝度検出手段によつて検出された輝度が予
め設定された基準値よりも高いとき前記抵抗の値
を小さくする一方、検出された輝度が基準値より
も低いとき前記抵抗の値を大きくする抵抗値切換
え手段を設けたことを特徴とする測距装置。[Claims for Utility Model Registration] Includes a light emitting device that emits signal light toward a distance-measuring object, and a photoelectric element that receives reflected light from the distance-measuring object and converts it into electric current, and includes signal light. Through a current removal circuit comprising a switching element and a resistor connected in series with each other, which removes most of the current that does not correspond to the signal light from the current converted by the photoelectric element upon receiving the reflected light from the object to be measured. A distance measuring device that measures the distance to an object to be measured based on the remaining current including the current corresponding to the signal light, comprising: a brightness detection means for detecting the brightness of the object to be measured; A resistance value that reduces the value of the resistor when the brightness detected by the brightness detection means is higher than a preset reference value, and increases the value of the resistor when the detected brightness is lower than the reference value. A distance measuring device characterized by being provided with a switching means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3695188U JPH01140116U (en) | 1988-03-19 | 1988-03-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3695188U JPH01140116U (en) | 1988-03-19 | 1988-03-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01140116U true JPH01140116U (en) | 1989-09-26 |
Family
ID=31263537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3695188U Pending JPH01140116U (en) | 1988-03-19 | 1988-03-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01140116U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141634A (en) * | 1990-09-29 | 1992-05-15 | Samsung Electron Co Ltd | Automatic focus adjuster for video camera and method thereof |
-
1988
- 1988-03-19 JP JP3695188U patent/JPH01140116U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04141634A (en) * | 1990-09-29 | 1992-05-15 | Samsung Electron Co Ltd | Automatic focus adjuster for video camera and method thereof |
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