GB1441927A - Illuminating a subject for filming - Google Patents

Illuminating a subject for filming

Info

Publication number
GB1441927A
GB1441927A GB5764072A GB5764072A GB1441927A GB 1441927 A GB1441927 A GB 1441927A GB 5764072 A GB5764072 A GB 5764072A GB 5764072 A GB5764072 A GB 5764072A GB 1441927 A GB1441927 A GB 1441927A
Authority
GB
United Kingdom
Prior art keywords
camera
source
gate
frequency
image intensifier
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
Application number
GB5764072A
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.)
Post Office
Original Assignee
Post Office
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.)
Filing date
Publication date
Application filed by Post Office filed Critical Post Office
Priority to GB5764072A priority Critical patent/GB1441927A/en
Publication of GB1441927A publication Critical patent/GB1441927A/en
Expired legal-status Critical Current

Links

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
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

1441927 Illuminating subjects for filming POST OFFICE 12 March 1974 [14 Dec 1972] 57640/72 Heading G2X [Also in Division H4] A subject 2 is illuminated by a source 4 with light pulsed at a frequency of at least 70 Hz so that the illumination appears to the human eye to be continuous, and the reflected light passes through a gate 8 to a T.V. or cine camera 7; the gate being operated at a frequency related to the pulsing frequency so that the camera records during the pulses. The average light intensity is thus comparatively low and discomfort of the subject 2 is thereby reduced. As shown, gate 8 comprises an image intensifier, camera 7 is a T.V. camera fibre optically coupled thereto, and a synchronizing circuit 6 modulates image intensifier 8 and pulses light source 4 via circuits 9 and 5. Preferably the frequency is related to that of a camera scanning circuit 10 to avoid bands appearing on the screen. A source 3 provides steady illumination. In alternatives, the gate 8 is a mechanical shutter, a Kerr cell shutter or a liquid crystal shutter used with or without an image intensifier. The source 4 may be a pulsed Xenon tube or a continuous source having a Kerr cell shutter.
GB5764072A 1972-12-14 1972-12-14 Illuminating a subject for filming Expired GB1441927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5764072A GB1441927A (en) 1972-12-14 1972-12-14 Illuminating a subject for filming

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5764072A GB1441927A (en) 1972-12-14 1972-12-14 Illuminating a subject for filming

Publications (1)

Publication Number Publication Date
GB1441927A true GB1441927A (en) 1976-07-07

Family

ID=10479658

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5764072A Expired GB1441927A (en) 1972-12-14 1972-12-14 Illuminating a subject for filming

Country Status (1)

Country Link
GB (1) GB1441927A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015184A1 (en) * 1980-04-19 1981-10-22 Daimler-Benz Ag, 7000 Stuttgart TV camera coping with moving objects - limits charge integration to certain partial time region of scanning interval
GB2191305A (en) * 1986-06-05 1987-12-09 British Aerospace Optical apparatus
FR2623353A1 (en) * 1987-11-17 1989-05-19 Ferranti Int Signal TELEVISION CAMERA SYSTEM

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015184A1 (en) * 1980-04-19 1981-10-22 Daimler-Benz Ag, 7000 Stuttgart TV camera coping with moving objects - limits charge integration to certain partial time region of scanning interval
GB2191305A (en) * 1986-06-05 1987-12-09 British Aerospace Optical apparatus
FR2623353A1 (en) * 1987-11-17 1989-05-19 Ferranti Int Signal TELEVISION CAMERA SYSTEM

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee