GB794945A - Improvements in or relating to television cameras - Google Patents

Improvements in or relating to television cameras

Info

Publication number
GB794945A
GB794945A GB21887/56A GB2188756A GB794945A GB 794945 A GB794945 A GB 794945A GB 21887/56 A GB21887/56 A GB 21887/56A GB 2188756 A GB2188756 A GB 2188756A GB 794945 A GB794945 A GB 794945A
Authority
GB
United Kingdom
Prior art keywords
tube
heater
shell
air
chamber
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
GB21887/56A
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh GmbH
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 Fernseh GmbH filed Critical Fernseh GmbH
Publication of GB794945A publication Critical patent/GB794945A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/275—Control of temperature characterised by the use of electric means with sensing element expanding, contracting, or fusing in response to changes of temperature
    • G05D23/27535—Details of the sensing element
    • G05D23/2754—Details of the sensing element using bimetallic element
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Studio Devices (AREA)
  • Particle Accelerators (AREA)

Abstract

794,945. Electron beam apparatus. FERNSEH GES. July 16, 1956 [July 16, 1955], No. 21887/56. Class 39(1). A television camera comprises a pick-up tube which is surrounded by a shell, the space between tube and shell forming part of a closed air circulatory system and including means for heating said air ; in addition means is also provided for producing a second separate flow of air between the outer wall of the shell and the camera housing. In the drawing, the pick-up tube 2 is enclosed by the shell 5 which forms one chamber of the closed circulatory system. Another chamber is formed as two channels, one containing a heater 8, and the other a fan 6 and motor 7. There is thus no direct heat radiation from heater to tube. The heated air passes from the heater 8 into the shell 5 and around the tube, into the fan chamber and so back to the heater chamber. This closed cycle is dust-free, so that it may circulate between the face-plate 3 of the tube and a variabledensity light filler 11 without causing abrasion or dispersion. A second fan 14 and motor 13 draws air through openings in the camera housing 1, this second air stream passing through a circular passage 10, flowing round the outside of the shell 5 and then round various circuit components 15. The tube 2 is of the imageorthicon type, and requires to be maintained advantageously during operation at about 45‹ to 60‹C. The closed air stream is arranged to be heated rapidly up to the required temperature, after which it is automatically switched over to a lower rate of heating sufficient to maintain the tube at working temperature. This lower rate can be varied. If the camera is switched off for a short time and then on again, the heater is arranged not to revert immediately to full heating, since this may damage the photocathode. Control of the heater to operate as described is provided by the relay circuit of Fig. 2 (not shown). Specification 743,163 [Group XX], is referred to.
GB21887/56A 1955-07-16 1956-07-16 Improvements in or relating to television cameras Expired GB794945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF17952A DE1020364B (en) 1955-07-16 1955-07-16 TV recording camera with temperature control

Publications (1)

Publication Number Publication Date
GB794945A true GB794945A (en) 1958-05-14

Family

ID=7088762

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21887/56A Expired GB794945A (en) 1955-07-16 1956-07-16 Improvements in or relating to television cameras

Country Status (3)

Country Link
DE (1) DE1020364B (en)
FR (1) FR1155631A (en)
GB (1) GB794945A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194382A (en) * 1986-08-21 1988-03-02 Bailey Concepts Limited Cathode ray tube with heated screen
CN103293831A (en) * 2013-06-04 2013-09-11 四川艾普视达数码科技有限公司 Camera with double convection fans
CN111741206A (en) * 2020-08-03 2020-10-02 北京中科原动力科技有限公司 Camera self-cleaning device, camera system and camera system control method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4984089A (en) 1990-01-08 1991-01-08 Sensormatic Electronics Corporation Outdoor surveillance dome with enhanced environmental aptitude and control system therefor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE462895A (en) * 1945-01-25

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2194382A (en) * 1986-08-21 1988-03-02 Bailey Concepts Limited Cathode ray tube with heated screen
CN103293831A (en) * 2013-06-04 2013-09-11 四川艾普视达数码科技有限公司 Camera with double convection fans
CN111741206A (en) * 2020-08-03 2020-10-02 北京中科原动力科技有限公司 Camera self-cleaning device, camera system and camera system control method
CN111741206B (en) * 2020-08-03 2021-01-08 北京中科原动力科技有限公司 Camera self-cleaning device, camera system and camera system control method

Also Published As

Publication number Publication date
DE1020364B (en) 1957-12-05
FR1155631A (en) 1958-05-06

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