NL7610152A - Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit - Google Patents

Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit

Info

Publication number
NL7610152A
NL7610152A NL7610152A NL7610152A NL7610152A NL 7610152 A NL7610152 A NL 7610152A NL 7610152 A NL7610152 A NL 7610152A NL 7610152 A NL7610152 A NL 7610152A NL 7610152 A NL7610152 A NL 7610152A
Authority
NL
Netherlands
Prior art keywords
extra
flashlights
copying
contrast control
bellows
Prior art date
Application number
NL7610152A
Other languages
Dutch (nl)
Original Assignee
Johan Beths Ind 8
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 Johan Beths Ind 8 filed Critical Johan Beths Ind 8
Priority to NL7610152A priority Critical patent/NL7610152A/en
Publication of NL7610152A publication Critical patent/NL7610152A/en

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
    • G03B27/727—Optical projection devices wherein the contrast is controlled optically (e.g. uniform exposure, two colour exposure on variable contrast sensitive material)

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Variable Magnification In Projection-Type Copying Machines (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Projection Apparatus (AREA)

Abstract

The optical arrangement enables the contrast of a slide copying appts. to be controlled. The copying appts. includes a tubular flashlight source, a lens (3) a bellows unit (4, 5) and a camera (11). Extra flashlights are controlled by a regulator (7) which responds to a photocell (10) on the optical axis in front of the film, and this is connected with the extra lights (9) contained inside the bellows and supported by two matt black brackets. The bellows unit itself permits the lens to be moved backwards and forwards along the optic axis to focus the projection from the main light.
NL7610152A 1976-09-13 1976-09-13 Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit NL7610152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7610152A NL7610152A (en) 1976-09-13 1976-09-13 Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7610152A NL7610152A (en) 1976-09-13 1976-09-13 Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit

Publications (1)

Publication Number Publication Date
NL7610152A true NL7610152A (en) 1978-03-15

Family

ID=19826884

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7610152A NL7610152A (en) 1976-09-13 1976-09-13 Contrast control for slide copying - has photocell detector to regulate illumination from extra flashlights inside bellows focussing unit

Country Status (1)

Country Link
NL (1) NL7610152A (en)

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Legal Events

Date Code Title Description
BV The patent application has lapsed