GB2012072A - Photoelectric exposure meter - Google Patents

Photoelectric exposure meter

Info

Publication number
GB2012072A
GB2012072A GB7900126A GB7900126A GB2012072A GB 2012072 A GB2012072 A GB 2012072A GB 7900126 A GB7900126 A GB 7900126A GB 7900126 A GB7900126 A GB 7900126A GB 2012072 A GB2012072 A GB 2012072A
Authority
GB
United Kingdom
Prior art keywords
cell
target area
casing
image
camera
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.)
Granted
Application number
GB7900126A
Other versions
GB2012072B (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB7900126A priority Critical patent/GB2012072B/en
Publication of GB2012072A publication Critical patent/GB2012072A/en
Application granted granted Critical
Publication of GB2012072B publication Critical patent/GB2012072B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4219—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for enlargers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Measuring Leads Or Probes (AREA)

Abstract

A photoelectric exposure meter is in the form of a device for checking and selecting the correct exposure when using a graphic art camera. It is a hand-held unit the casing (1) of which can be placed on a transparent or translucent plate at the back of the camera and on to which the camera image is focussed. The back of the casing (1) has a viewing lens (3) through which a magnified target area of the image can be selected and viewed, this area being defined by index lines (5) on a transparent window (4) at the back of the casing (1). A probe (7) carrying a photoresistive cell is movable from a resting position clear of the target area to an operative position in which the cell is in the target area. An electrical circuit contains the cell and includes a potentiometer P1 the adjustment of which for a null indication by a moving coil meter M1 provides an indication of the intensity of illumination of the cell and hence of the target area. <IMAGE>
GB7900126A 1978-01-03 1979-01-03 Photoelectric exposure meter Expired GB2012072B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7900126A GB2012072B (en) 1978-01-03 1979-01-03 Photoelectric exposure meter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2478 1978-01-03
GB7900126A GB2012072B (en) 1978-01-03 1979-01-03 Photoelectric exposure meter

Publications (2)

Publication Number Publication Date
GB2012072A true GB2012072A (en) 1979-07-18
GB2012072B GB2012072B (en) 1982-07-07

Family

ID=26235623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7900126A Expired GB2012072B (en) 1978-01-03 1979-01-03 Photoelectric exposure meter

Country Status (1)

Country Link
GB (1) GB2012072B (en)

Also Published As

Publication number Publication date
GB2012072B (en) 1982-07-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee