GB968100A - Improvements in television camera circuits - Google Patents

Improvements in television camera circuits

Info

Publication number
GB968100A
GB968100A GB14152/61A GB1415261A GB968100A GB 968100 A GB968100 A GB 968100A GB 14152/61 A GB14152/61 A GB 14152/61A GB 1415261 A GB1415261 A GB 1415261A GB 968100 A GB968100 A GB 968100A
Authority
GB
United Kingdom
Prior art keywords
stage
tube
target
television camera
april
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
GB14152/61A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB968100A publication Critical patent/GB968100A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/749—Circuitry for compensating brightness variation in the scene by influencing the pick-up tube voltages

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Image Signal Generators (AREA)

Abstract

968,100. Controlling television camera tubes; pulse clipping circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. April 19, 1961 [April 22, 1960], No. 14152/61. Headings H3T, H4F and H4T. In a circuit for controlling the sensitivity of a television camera tube V, the video output signal of the tube is applied via a variable threshold stage T3 to control the resistance of a stage T4 which functions as a variable leakage path for an integrating circuit C1, R2, the resulting voltage across the integrating circuit being applied to the target of the tube via resistor R3. The time constant of C1, R2 is made equal to at least one television frame period and preferably much longer so that the voltage applied to the tube target is proportional to the mean value by which the video signal exceeds the threshold level set by stage T3. The threshold level is made adjustable by potentiometer R1. A Zener diode Z limits the maximum potential applied to the camera tube target when the signal level is low. Stage T1 is an emitter follower; stage T2 is a damp stage which is rendered conductive by blanking signals applied at B. The valve in stage T4 may be replaced by a transistor.
GB14152/61A 1960-04-22 1961-04-19 Improvements in television camera circuits Expired GB968100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR825051A FR1262729A (en) 1960-04-22 1960-04-22 Improvements to television cameras

Publications (1)

Publication Number Publication Date
GB968100A true GB968100A (en) 1964-08-26

Family

ID=8729854

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14152/61A Expired GB968100A (en) 1960-04-22 1961-04-19 Improvements in television camera circuits

Country Status (2)

Country Link
FR (1) FR1262729A (en)
GB (1) GB968100A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187336B (en) * 1959-06-04 1965-02-18 Siemens Ag Burn-off resistance butt welding machine, especially for large welding cross-sections
US3975591A (en) * 1973-02-09 1976-08-17 Viteci S.A. Electronic camera

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3180934A (en) * 1962-08-24 1965-04-27 Gen Precision Inc Vidicon target voltage control system with dark current compensation
FR1384848A (en) * 1963-11-29 1965-01-08 Compteurs Comp D Device for automatic adjustment of the output level of a television camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1187336B (en) * 1959-06-04 1965-02-18 Siemens Ag Burn-off resistance butt welding machine, especially for large welding cross-sections
US3975591A (en) * 1973-02-09 1976-08-17 Viteci S.A. Electronic camera

Also Published As

Publication number Publication date
FR1262729A (en) 1961-06-05

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