GB1362984A – Rangefinder
– Google Patents
GB1362984A – Rangefinder
– Google Patents
Rangefinder
Info
Publication number
GB1362984A
GB1362984A
GB4434971A
GB4434971A
GB1362984A
GB 1362984 A
GB1362984 A
GB 1362984A
GB 4434971 A
GB4434971 A
GB 4434971A
GB 4434971 A
GB4434971 A
GB 4434971A
GB 1362984 A
GB1362984 A
GB 1362984A
Authority
GB
United Kingdom
Prior art keywords
cell
lens
pattern
focus
switch
Prior art date
1970-09-28
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
Application number
GB4434971A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
1970-09-28
Filing date
1971-09-23
Publication date
1974-08-14
1971-09-23
Application filed by Eastman Kodak Co
filed
Critical
Eastman Kodak Co
1974-08-14
Publication of GB1362984A
publication
Critical
patent/GB1362984A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G02—OPTICS
G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
G02B7/28—Systems for automatic generation of focusing signals
G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
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
Abstract
1362984 Photo-electric distance measuring EASTMAN KODAK CO 23 Sept 1971 [28 Sept 1970] 44349/71 Heading H4D A rangefinder comprises a light source 47, an optical system and a transparency 53 for projecting a contrast pattern on to an object 41. A lens 22 is used to focus the pattern on to a photo-cell 44 which gives an abrupt change at its output (Fig. 3, not shown) when the pattern is in focus on the cell, indicating the object range. A chopper 54 or electronic means is preferably provided to give an A.C. signal from the cell which is passed to a band-pass filter 77 centred on the chopper frequency. A detector circuit 78 and switch 81 are provided to determine when the pattern is in focus on the cell and serve to switch off lens adjusting motor 28 driving lenses 22, 23 and camera lens 14, the lenses being initially at infinity focus position. To enhance the signal to noise ratio an optical filter 58 limiting the received light to the part of the spectrum to which the cell is most responsive can be provided. A lens stop 57 may be used to enhance the abrupt change in the cell output. To maintain the amount of light received by cell 44 constant as lens 22 is moved various aperture systems may be provided (Figs. 4, 5, not shown). The response of the cell when no such system is used (Fig. 3, not shown) is thus flattened out (Fig. 6, not shown) and enables a simple threshold detector to be used for switch 81.
GB4434971A
1970-09-28
1971-09-23
Rangefinder
Expired
GB1362984A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US7608170A
1970-09-28
1970-09-28
Publications (1)
Publication Number
Publication Date
GB1362984A
true
GB1362984A
(en)
1974-08-14
Family
ID=22129823
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4434971A
Expired
GB1362984A
(en)
1970-09-28
1971-09-23
Rangefinder
Country Status (4)
Country
Link
US
(1)
US3653762A
(en)
DE
(1)
DE2148189A1
(en)
FR
(1)
FR2108593A5
(en)
GB
(1)
GB1362984A
(en)
Families Citing this family (12)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2116872A5
(en)
*
1970-12-10
1972-07-21
Compteurs Comp D
IMPROVEMENTS TO OPTICAL PROBING DEVICES
DE2456922C2
(en)
*
1974-12-02
1986-10-09
Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar
Device for measuring the relative distance
DE2403518C2
(en)
*
1974-01-25
1984-02-02
Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar
Method for measuring the relative distance of an object to a reference system using an optical image correlator, as well as the device for its implementation
US4040739A
(en)
*
1976-03-15
1977-08-09
Witte Wolfgang W
Method and device for generating a signal dependent on the distance of an object in an object space
JPS54147833A
(en)
*
1978-05-12
1979-11-19
Canon Inc
Distance measuring finder
DE2933077A1
(en)
*
1978-09-04
1980-03-13
Hauser Raimund
FOCUSING DEVICE
FR2442447A1
(en)
*
1978-11-22
1980-06-20
Hamel Bernard
Acceleration measurement using counter – is determined from shift in peak of absorption of radiation from gamma source
JPS57119330A
(en)
*
1981-01-16
1982-07-24
Canon Inc
Camera incorporating auto-focusing system
DE3310601C2
(en)
*
1982-03-24
1994-02-10
Canon Kk
Distance measuring device
US4827301A
(en)
*
1984-12-11
1989-05-02
Minolta Camera Kabushiki Kaisha
Focus detection system and lighting device therefor
US4690538A
(en)
*
1984-12-11
1987-09-01
Minolta Camera Kabushiki Kaisha
Focus detection system and lighting device therefor
US4843415A
(en)
*
1986-09-22
1989-06-27
Minolta Camera Kabushiki Kaisha
Automatic focus detection system
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE1447450A1
(en)
*
1963-06-14
1968-10-31
Agfa Ag
Distance measuring or control device
US3435744A
(en)
*
1966-05-31
1969-04-01
Eastman Kodak Co
Automatic focusing system
1970
1970-09-28
US
US76081A
patent/US3653762A/en
not_active
Expired – Lifetime
1971
1971-09-23
GB
GB4434971A
patent/GB1362984A/en
not_active
Expired
1971-09-27
FR
FR7134642A
patent/FR2108593A5/fr
not_active
Expired
1971-09-27
DE
DE19712148189
patent/DE2148189A1/en
active
Pending
Also Published As
Publication number
Publication date
DE2148189A1
(en)
1972-03-30
US3653762A
(en)
1972-04-04
FR2108593A5
(en)
1972-05-19
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Legal Events
Date
Code
Title
Description
1974-12-27
PS
Patent sealed [section 19, patents act 1949]
1978-05-04
PLNP
Patent lapsed through nonpayment of renewal fees
