GB1138152A – Photographic projection apparatus
– Google Patents
GB1138152A – Photographic projection apparatus
– Google Patents
Photographic projection apparatus
Info
Publication number
GB1138152A
GB1138152A
GB5813/66A
GB581366A
GB1138152A
GB 1138152 A
GB1138152 A
GB 1138152A
GB 5813/66 A
GB5813/66 A
GB 5813/66A
GB 581366 A
GB581366 A
GB 581366A
GB 1138152 A
GB1138152 A
GB 1138152A
Authority
GB
United Kingdom
Prior art keywords
slide
pressure
tube
motor
source
Prior art date
1965-02-15
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
GB5813/66A
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.)
1965-02-15
Filing date
1966-02-10
Publication date
1968-12-27
1966-02-10
Application filed by Eastman Kodak Co
filed
Critical
Eastman Kodak Co
1968-12-27
Publication of GB1138152A
publication
Critical
patent/GB1138152A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
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
G03B21/00—Projectors or projection-type viewers; Accessories therefor
G03B21/14—Details
G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
Abstract
1,138,152. Automatic position control. EASTMAN KODAK CO. Feb. 10, 1966 [Feb. 15, 19651, No.5813/66. Heading G3R. [Also in Division G1] In a photographic projector, a stream of fluid is directed from a compressor on to the transparency and pressure variations dependent on . variations of the position of the latter are utilized to control restoration of the transparency to a position of focus automatically. Fig. 1 shows a slide projector in which light from a source 10 passes through a condenser lens 12, a slide 25 and a projection lens 26. Air from a blower 11 passes through a transparent tube 22 to a space, between the slide and a fixed transparent convex surface 20, the pressure in which is transmitted through a tube 27 to a pressure gauge 30. When the pressure in the space corresponds to that at which ‘ the slide is at the focus of lens 26, a vane 31 carried by the pointer of the pressure gauge shields two solid state photo-conductive rectifiers, such as 33, from light derived from the projection beam by a partial reflector 15. Deviation of the slide in one sense or the other from this position causes the pressure gauge to expose one or the other of the rectifiers so that a D. C. motor 28 is run from an A. C. source in the appropriate direction to correct the slide position by moving a slide carrier 18 backwards or forwards. A switch 34 opens to disable the motor circuit when a slide is removed. In a modification, the air is supplied through a transparent tube directed towards the centre of the slide, pressure variations due to slide movement being detected within the tube and transmitted to a bellows which operates a reversing switch controlling the supply to the motor from a D. C. source. In this arrangement the tube moves away from the slide when the latter is removed and also operates the motor cut-out switch. There are references to the application of the invention to photo-enlargers and cine projectors.
GB5813/66A
1965-02-15
1966-02-10
Photographic projection apparatus
Expired
GB1138152A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US432695A
US3326081A
(en)
1965-02-15
1965-02-15
Automatic focussing slide projector
Publications (1)
Publication Number
Publication Date
GB1138152A
true
GB1138152A
(en)
1968-12-27
Family
ID=23717231
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5813/66A
Expired
GB1138152A
(en)
1965-02-15
1966-02-10
Photographic projection apparatus
Country Status (2)
Country
Link
US
(1)
US3326081A
(en)
GB
(1)
GB1138152A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
CN110308611A
(en)
*
2019-07-22
2019-10-08
义乌纹挺新能源科技有限公司
A kind of projector automatic focusing device
Families Citing this family (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3402638A
(en)
*
1966-12-05
1968-09-24
Eastman Kodak Co
Automatic film focusing by pneumatic servomechanism
US3471225A
(en)
*
1966-12-05
1969-10-07
Eastman Kodak Co
Automatic focusing motion picture projector
US3704657A
(en)
*
1971-05-05
1972-12-05
Computervision Corp
Adaptive optical focusing system
US3984678A
(en)
*
1974-04-05
1976-10-05
Nippon Jido Seigyo Ltd.
Apparatus for automatically adjusting a microscope in focus
US5609404A
(en)
*
1996-04-16
1997-03-11
Eastman Kodak Company
Apparatus and related method for correcting slide warpage in a slide projector
EP1965247B1
(en)
*
1999-06-29
2012-04-25
Sony Corporation
Projection display devices with air cooling system
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3124996A
(en)
*
1964-03-17
Portable micro
US3103850A
(en)
*
1961-12-14
1963-09-17
Ibm
Pneumatically operated document sensing station
US3260153A
(en)
*
1963-03-19
1966-07-12
Ncr Co
Reducing camera
1965
1965-02-15
US
US432695A
patent/US3326081A/en
not_active
Expired – Lifetime
1966
1966-02-10
GB
GB5813/66A
patent/GB1138152A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
CN110308611A
(en)
*
2019-07-22
2019-10-08
义乌纹挺新能源科技有限公司
A kind of projector automatic focusing device
CN110308611B
(en)
*
2019-07-22
2021-01-26
山东万恒电子通讯设备有限公司
Automatic focusing device of projector
Also Published As
Publication number
Publication date
US3326081A
(en)
1967-06-20
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Cinematographic device for projection. (Machine-translation by Google Translate, not legally binding)
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