JPS5724905A - Focusing detector - Google Patents
Focusing detectorInfo
- Publication number
- JPS5724905A JPS5724905A JP9961880A JP9961880A JPS5724905A JP S5724905 A JPS5724905 A JP S5724905A JP 9961880 A JP9961880 A JP 9961880A JP 9961880 A JP9961880 A JP 9961880A JP S5724905 A JPS5724905 A JP S5724905A
- Authority
- JP
- Japan
- Prior art keywords
- gravity
- optical
- center
- brightness
- psd
- 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
- G01C3/10—Measuring distances in line of sight; Optical rangefinders using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/46—Indirect determination of position data
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE:To obtain certainly a center of gravity of brightness of spot light by shifting an optical detecting surface to a position eccentric to an optical axis, by arranging an image position detector PSD at an equivalent position of an image forming plane and by judging focusing using the extreme value of the output. CONSTITUTION:The upper side of an optical axis of a PSD placed at a position equivalent to a film F has light blocked with a mask 4 and an optical detecting surface is eccentric to the optical axis. For the situation, as an optical image on the PSD is enlarged with fading, a center of gravity of brightness moves, and a difference between output power sources I1, I2 increases gradually. This output currents I1, I2 are subjected to an arithmetic processing in a position detecting and processing circuit PDC, and a shifted extent of a center of gravity of brightness is indicated on a meter M. Therefore if a photographic lens 2 is adjusted such that the meter M indecates a minimum value, focusing can be obtained.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9961880A JPS5724905A (en) | 1980-07-21 | 1980-07-21 | Focusing detector |
US06/281,890 US4441810A (en) | 1980-07-15 | 1981-07-09 | Range finder |
DE19813127786 DE3127786A1 (en) | 1980-07-15 | 1981-07-14 | DISTANCE KNIFE, ESPECIALLY FOR CAMERAS OR THE LIKE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9961880A JPS5724905A (en) | 1980-07-21 | 1980-07-21 | Focusing detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5724905A true JPS5724905A (en) | 1982-02-09 |
Family
ID=14252076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9961880A Pending JPS5724905A (en) | 1980-07-15 | 1980-07-21 | Focusing detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5724905A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531053A (en) * | 1981-09-25 | 1985-07-23 | Sig Societe Industrielle Suisse | Railway work machine |
US4538061A (en) * | 1981-09-25 | 1985-08-27 | Sig Societe Industrielle Suisse | Railway work machine |
-
1980
- 1980-07-21 JP JP9961880A patent/JPS5724905A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4531053A (en) * | 1981-09-25 | 1985-07-23 | Sig Societe Industrielle Suisse | Railway work machine |
US4538061A (en) * | 1981-09-25 | 1985-08-27 | Sig Societe Industrielle Suisse | Railway work machine |
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