GB1412370A - Photographic enlargement apparatus - Google Patents

Photographic enlargement apparatus

Info

Publication number
GB1412370A
GB1412370A GB6007373A GB6007373A GB1412370A GB 1412370 A GB1412370 A GB 1412370A GB 6007373 A GB6007373 A GB 6007373A GB 6007373 A GB6007373 A GB 6007373A GB 1412370 A GB1412370 A GB 1412370A
Authority
GB
United Kingdom
Prior art keywords
lamp
exposure
switch
thyristor
capacitor
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
GB6007373A
Other languages
English (en)
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.)
Rollei Werke Franke und Heidecke GmbH and Co KG
Original Assignee
Rollei Werke Franke und Heidecke GmbH and Co KG
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 Rollei Werke Franke und Heidecke GmbH and Co KG filed Critical Rollei Werke Franke und Heidecke GmbH and Co KG
Publication of GB1412370A publication Critical patent/GB1412370A/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
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Control Of Exposure In Printing And Copying (AREA)
  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
GB6007373A 1973-02-14 1973-12-28 Photographic enlargement apparatus Expired GB1412370A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732307200 DE2307200B2 (de) 1973-02-14 1973-02-14 Fotografischer vergroesserungsapparat

Publications (1)

Publication Number Publication Date
GB1412370A true GB1412370A (en) 1975-11-05

Family

ID=5871870

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6007373A Expired GB1412370A (en) 1973-02-14 1973-12-28 Photographic enlargement apparatus

Country Status (6)

Country Link
US (1) US3895257A (de)
JP (1) JPS49114925A (de)
DE (1) DE2307200B2 (de)
FR (1) FR2218029A5 (de)
GB (1) GB1412370A (de)
IT (1) IT999832B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3403736A1 (de) 2017-05-17 2018-11-21 Primetals Technologies Austria GmbH Führen metallischer bänder in einer bandbearbeitungsanlage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571612A (en) * 1967-12-20 1971-03-23 Ricoh Kk Safety device for an exposure lamp in a reproduction apparatus
US3555390A (en) * 1968-10-07 1971-01-12 Sylvania Electric Prod Switching circuit for motor control in slide scanning systems
US3737734A (en) * 1968-10-25 1973-06-05 Minolta Camera Kk Copying machine
US3742295A (en) * 1970-03-30 1973-06-26 Minolta Camera Kk Lighting system in copying apparatus
US3611049A (en) * 1970-06-29 1971-10-05 Dick Co Ab Automatic power control circuit
DE2043010C3 (de) * 1970-08-29 1979-08-23 Siemens Ag, 1000 Berlin U. 8000 Muenchen Abfallverzögertes Zeitrelais
US3697821A (en) * 1971-07-30 1972-10-10 Hunt Electronics Co Light dimming system having multiple control units
US3808456A (en) * 1971-09-27 1974-04-30 Switchpack Systems Remote control switching system

Also Published As

Publication number Publication date
DE2307200B2 (de) 1976-08-05
FR2218029A5 (de) 1974-09-06
JPS49114925A (de) 1974-11-01
DE2307200A1 (de) 1974-08-22
IT999832B (it) 1976-03-10
US3895257A (en) 1975-07-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee