GB1389847A - Photo-electric range finder - Google Patents
Photo-electric range finderInfo
- Publication number
- GB1389847A GB1389847A GB2949772A GB2949772A GB1389847A GB 1389847 A GB1389847 A GB 1389847A GB 2949772 A GB2949772 A GB 2949772A GB 2949772 A GB2949772 A GB 2949772A GB 1389847 A GB1389847 A GB 1389847A
- Authority
- GB
- United Kingdom
- Prior art keywords
- photo
- images
- signals
- scene
- range
- 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.)
- Expired
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
- G01C3/085—Use of electric radiation detectors with electronic parallax measurement
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/18—Focusing aids
- G03B13/20—Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Viewfinders (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
1389847 Photo-electric range finding K VOCKENHUBER and R HAUSER 23 June 1972 [23 June 1971 14 Jan 1972] 29497/72 Heading H4D A range finder has an optical system providing two separate images of a scene to be ranged which are always identical or mirror images of each other when the range setting of the optical system corresponds to the range of the scene, said condition being detected photo-electrically. In Fig. 2 a scene is split into two mirror images and photo-cell pairs n-1, n-1<SP>1</SP> to n-19, n-19<SP>1</SP> are sequentially interrogated to give electrical signals for each pair, the signals being compared in an electrical circuit. At correct range setting the composed signals are identical. In the prior art method in which the scene is split into two partial images which are not mirror images or identical (Figs. 1a, 1b, not shown), it is stated that the range finger may give a correct range setting indication when the two partial images are incorrectly matched (Fig. 1b, not shown). Fig. 5 illustrates the electrical circuit. Photocell lines n, n<SP>1</SP> are interrogated by pulses from generator 15, the interrogation being initiated by pulses C, D and an interrogation cycle being determined by device 16. A delay 18 is alternately enabled so that pulse D is alternately delayed with respect to pulse C, thus synthesizing a lateral shift in the mirror or identical images. The resulting signals are passed to amplifiers 20, 20<SP>1</SP>, enabled by device 24, only when signals are expected, to high pass filters 21, 21<SP>1</SP>, to suppress the effects of ambient light, amplifiers 22, 221 and Schmitt triggers 23, 23<SP>1</SP> to digitize the signals. The digitized signals are passed to an Exclusive - OR gate 25, integrator 26 and amplifier 27 feeding high pass filter 37. Two bi-stables 32, 33 receive the filter 31 output and the delay energizing signal E. The bi-stables form a phase detector and determine the lighting of the lamps 29, 30 which give no signal at correct range setting, and either one flashes according to the direction of the incorrect setting. The signals L, M may be used for auto-focusing. Fig. 8 illustrates a camera having an objective 41 and film plane 44. A beam splitter 42 directs light from the scene to a lens L3 and to two lenses L1, L2 via beam splitter 46, lens L1 being of short focal length and lens L2 being of long focal length. The lenses direct light on to photo-cells 47, 48. At correct range setting the images on the photo-cells are the same but at incorrect setting the images will be of different size and focus (see Fig. 9, not shown). The photo-cells may be replaced by a system similar to that of Figs. 2 and 5 or by a photo-cell consisting of concentric sensitive elements (Fig. 10, not shown). Optical apparatus for giving the images of Fig. 2 is detailed (Figs. 3, 4, not shown).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT547271A AT304260B (en) | 1971-06-23 | 1971-06-23 | Range finder |
AT30372A AT313057B (en) | 1972-01-14 | 1972-01-14 | Range finder |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1389847A true GB1389847A (en) | 1975-04-09 |
Family
ID=25592248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2949772A Expired GB1389847A (en) | 1971-06-23 | 1972-06-23 | Photo-electric range finder |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH543076A (en) |
GB (1) | GB1389847A (en) |
HK (1) | HK9476A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2128050A (en) * | 1982-09-29 | 1984-04-18 | Pentacon Dresden Veb | Arrangement for automatic focusing of photographic cameras |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT384106B (en) * | 1981-10-26 | 1987-10-12 | Sony Corp | DEVICE FOR DETERMINING THE DISTANCE FROM AN OBJECT |
-
1972
- 1972-06-12 CH CH890172A patent/CH543076A/en not_active IP Right Cessation
- 1972-06-23 GB GB2949772A patent/GB1389847A/en not_active Expired
-
1976
- 1976-02-26 HK HK9476A patent/HK9476A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2128050A (en) * | 1982-09-29 | 1984-04-18 | Pentacon Dresden Veb | Arrangement for automatic focusing of photographic cameras |
Also Published As
Publication number | Publication date |
---|---|
HK9476A (en) | 1976-03-05 |
CH543076A (en) | 1973-10-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |