JPS57118108A - Distance detector - Google Patents
Distance detectorInfo
- Publication number
- JPS57118108A JPS57118108A JP435881A JP435881A JPS57118108A JP S57118108 A JPS57118108 A JP S57118108A JP 435881 A JP435881 A JP 435881A JP 435881 A JP435881 A JP 435881A JP S57118108 A JPS57118108 A JP S57118108A
- Authority
- JP
- Japan
- Prior art keywords
- photodetector
- radiations
- detection
- opposition
- photodetecting
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/02—Details
- G01C3/06—Use of electric means to obtain final indication
- G01C3/08—Use of electric radiation detectors
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Optical Distance (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To decrease the influence of radiations from other than an object and to improve the accuracy of distance detection by disposing a photodetector receiving the radiations reflected from the object and an other photodetector having a photodetecting surface of such a shape as to encircle the photodetecting surface of said detector and constituting a circuit in such a way that the electric outputs thereof are in opposition to each other. CONSTITUTION:The circumference of a photodetector for detection of the signal light receiving the radiations reflected from an object is encircled with a photodetector for canceling noise of roughly the same characteristics and photodetecting area and a circuit is so connected that the electrical outputs of these photodetectors are in opposition to each other. For example, a photodetector 5 for detection of signal light and a photodetector 11 for cancelling noise separated by means of an insulating region 12 on the same chip are formed. Since 5 and 11 connected in mutually opposite directions, the electromotive forces negate to each other upon incidence of the radiations other than from the target, and the output of an operational amplifier 10 is virtually eliminated, thus the detection waveform for the radiation from a radiation source 3 is extremely sharp.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP435881A JPS57118108A (en) | 1981-01-14 | 1981-01-14 | Distance detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP435881A JPS57118108A (en) | 1981-01-14 | 1981-01-14 | Distance detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57118108A true JPS57118108A (en) | 1982-07-22 |
Family
ID=11582159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP435881A Pending JPS57118108A (en) | 1981-01-14 | 1981-01-14 | Distance detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57118108A (en) |
-
1981
- 1981-01-14 JP JP435881A patent/JPS57118108A/en active Pending
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