GB1040601A - Control device for photographic installation - Google Patents

Control device for photographic installation

Info

Publication number
GB1040601A
GB1040601A GB742263A GB742263A GB1040601A GB 1040601 A GB1040601 A GB 1040601A GB 742263 A GB742263 A GB 742263A GB 742263 A GB742263 A GB 742263A GB 1040601 A GB1040601 A GB 1040601A
Authority
GB
United Kingdom
Prior art keywords
accordance
capacitor
resistor
shutter
resistors
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
GB742263A
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.)
ROMAIN NOTTARIS
Original Assignee
ROMAIN NOTTARIS
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
Priority claimed from CH214162A external-priority patent/CH399178A/en
Application filed by ROMAIN NOTTARIS filed Critical ROMAIN NOTTARIS
Publication of GB1040601A publication Critical patent/GB1040601A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/007—Processing control, e.g. test strip, timing devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

1,040,601. Relay operating circuits. R. NOTTARIS, H. WAGNER, [trading as NOT. TARIS & WAGNER], and P. WEISHAUPT. Feb. 25, 1963 [Feb. 24, 1962; May 1, 1962], No. 7422/63. Heading H3P. [Also in Division G1] A timer for photographic printing exposure times comprises a capacitor charged by a photodiode illuminated by a pilot lamp and a switching unit operated at a predetermined capacitor potential to terminate exposure. A capacitor appropriate to the emulsion sensitivity is selected from capacitors 21 by switches 21a ... 21d. Exposure is initiated by a pushbutton 11 which closes contact 2 to open the shutter and opens contact 5 to allow photo-diode 20 to charge the selected capacitor. The charging current is determined by the brightness of lamp 23 connected to the same supply as the printing lamp which is governed by resistors 25 which are selected in accordance with the gamma to which the emulsion is to be subjected on development and a calibrating resistor 26. This brightness is further modified by a diaphragm 24 adjusted in accordance with the density of the original. The switching unit 12 is of a type in which current between electrodes 13 and 15 is interrupted when the potential on an electrode 14 relative to electrode 13 rises above a threshold value. The potential on electrode 13 is determined by a resistor 17 selected in accordance with filter factors and a resistor set in accordance with the degree of enlargement employed. When conduction between electrodes 13 and 15 is interrupted, relay 10 drops out, opening contact 2 to close the shutter. In a similar ancilliary apparatus for determining development times resistor 18 and shutter 24 are omitted and a fixed capacitor is used in place of capacitors 21. The resistors 25 are selected in accordance with the type of emulsion in use and resistors 17 in accordance with the development gamma. The ancilliary apparatus may be included in the same unit as the timer of the invention, components being used in common.
GB742263A 1962-02-24 1963-02-25 Control device for photographic installation Expired GB1040601A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH214162A CH399178A (en) 1962-02-24 1962-02-24 Control device for photographic equipment
CH520462A CH423476A (en) 1962-02-24 1962-05-01 Control device for photographic equipment

Publications (1)

Publication Number Publication Date
GB1040601A true GB1040601A (en) 1966-09-01

Family

ID=25689619

Family Applications (1)

Application Number Title Priority Date Filing Date
GB742263A Expired GB1040601A (en) 1962-02-24 1963-02-25 Control device for photographic installation

Country Status (2)

Country Link
CH (1) CH423476A (en)
GB (1) GB1040601A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199252A (en) * 1977-09-20 1980-04-22 Vermeulen Dirk J Photographic enlarging exposure meters
EP0694816A1 (en) * 1994-07-30 1996-01-31 Kodak Limited Method of processing photographic silver halide materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4199252A (en) * 1977-09-20 1980-04-22 Vermeulen Dirk J Photographic enlarging exposure meters
EP0694816A1 (en) * 1994-07-30 1996-01-31 Kodak Limited Method of processing photographic silver halide materials

Also Published As

Publication number Publication date
CH423476A (en) 1966-10-31

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