GB1096813A - Camera shutter efficiency testing apparatus - Google Patents

Camera shutter efficiency testing apparatus

Info

Publication number
GB1096813A
GB1096813A GB45703/64A GB4570364A GB1096813A GB 1096813 A GB1096813 A GB 1096813A GB 45703/64 A GB45703/64 A GB 45703/64A GB 4570364 A GB4570364 A GB 4570364A GB 1096813 A GB1096813 A GB 1096813A
Authority
GB
United Kingdom
Prior art keywords
signal
signals
conduct
line
negative
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
GB45703/64A
Inventor
Graham Saxby
Timothy Guyon Richards
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB45703/64A priority Critical patent/GB1096813A/en
Publication of GB1096813A publication Critical patent/GB1096813A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter
    • G—PHYSICS
    • G04—HOROLOGY
    • G04F—TIME-INTERVAL MEASURING
    • G04F10/00—Apparatus for measuring unknown time intervals by electric means
    • G04F10/04—Apparatus for measuring unknown time intervals by electric means by counting pulses or half-cycles of an ac
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06J—HYBRID COMPUTING ARRANGEMENTS
    • G06J1/00—Hybrid computing arrangements
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Automation & Control Theory (AREA)
  • Evolutionary Computation (AREA)
  • Fuzzy Systems (AREA)
  • Software Systems (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

1,096,813. Transistor switching circuits. MINISTRY OF DEFENCE. Nov. 10, 1965 [Nov. 10, 1964; March 23, 1965], Nos. 45703/64 and 12316/65. Heading H3T. [Also in Divisions G1 and G4] Gating circuits (Fig. 4).-A negative-going signal applied to R52 is transmitted to the line 55 provided it occurs after a positive signal is applied to R53. With no signals applied to R52 or R53, T29 is off and T30 is on. If the negative signal is applied to R52 when no signal is applied to R53, T29 is switched on, and the voltage on line 55 is limited to that developed across T29 and the non-linear diode D12. If then a signal is applied to R53, the current drawn thereby is smaller than that through D12 and so has little effect on the voltage on line 55. If, however, the positive signal is applied first, both T29 and T30 are off so that when the negative signal is applied to R52, it appears substantially unattenuated on 55 since the leakage current through T29 is small. Comparator circuits (Fig. 3).-The signals applied " FROM T8 " and " FROM 16 " are compared by feeding them to transistors T23, T24 respectively, the bases of which are pulsed alternately by interlaced pulse trains on lines A and B. The A.C. signal thereby developed across R40 is indicative of the difference between the applied signals and so long as this is large enough to make T26 and D9 conduct alternately. Conduction of T26 makes T27 conduct to transmit pulses " TO Q1." When the signals are substantially equal, T26 does not conduct, and no more pulses are transmitted " TO Q1." After 20 msec. a signal " FROM 21 " enabling T23, T24 and T27 ceases and a signal " FROM 20 " which has been delayed by the network C1, R38, R39, T20 enables T21, T22 and T28 so that signals " FROM 18 " and " FROM 40 " can be compared in the same way to control pulses applied "TO Q1."
GB45703/64A 1964-11-10 1964-11-10 Camera shutter efficiency testing apparatus Expired GB1096813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB45703/64A GB1096813A (en) 1964-11-10 1964-11-10 Camera shutter efficiency testing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45703/64A GB1096813A (en) 1964-11-10 1964-11-10 Camera shutter efficiency testing apparatus

Publications (1)

Publication Number Publication Date
GB1096813A true GB1096813A (en) 1967-12-29

Family

ID=10438224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB45703/64A Expired GB1096813A (en) 1964-11-10 1964-11-10 Camera shutter efficiency testing apparatus

Country Status (1)

Country Link
GB (1) GB1096813A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096732A (en) * 1977-08-19 1978-06-27 Springer Barry R Camera testing methods and apparatus
US5649253A (en) * 1995-03-31 1997-07-15 Eastman Kodak Company Self calibration circuit for a camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096732A (en) * 1977-08-19 1978-06-27 Springer Barry R Camera testing methods and apparatus
US5649253A (en) * 1995-03-31 1997-07-15 Eastman Kodak Company Self calibration circuit for a camera

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