GB1204401A - Focusing arrangement for photographic cameras - Google Patents

Focusing arrangement for photographic cameras

Info

Publication number
GB1204401A
GB1204401A GB1003268A GB1003268A GB1204401A GB 1204401 A GB1204401 A GB 1204401A GB 1003268 A GB1003268 A GB 1003268A GB 1003268 A GB1003268 A GB 1003268A GB 1204401 A GB1204401 A GB 1204401A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
current
linearity
linear relationship
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
GB1003268A
Inventor
Gottfried Konig
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.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
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 Pentacon Dresden VEB filed Critical Pentacon Dresden VEB
Priority to GB1003268A priority Critical patent/GB1204401A/en
Publication of GB1204401A publication Critical patent/GB1204401A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

1,204,401. Automatic focusing. PENTACON DRESDEN KAMERAUND KINOWERKE VEB. 1 March, 1968, No. 10032/68. Heading H4D. An automatic focusing arrangement in a photographic camera includes a photo-cell having a non-linear relationship between the emitted photo-current and the area of the cell illuminated when a subject being taken is imaged thereupon, this photo-current depending on the degree of defocusing and being used to effect a displacement of the objective lens of the camera, e.g. by a servomotor. The non- linearity may be achieved by providing a graduated filter of varying density in front of the sensitive area of the cell, or the sensitive area may have different partial sensitivities. With the non-linearity established as above by external means, photo-electric elements having a linear relationship between the photo-current and the illumination intensity (e.g. photoelectric diodes) may be used.
GB1003268A 1968-03-01 1968-03-01 Focusing arrangement for photographic cameras Expired GB1204401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1003268A GB1204401A (en) 1968-03-01 1968-03-01 Focusing arrangement for photographic cameras

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1003268A GB1204401A (en) 1968-03-01 1968-03-01 Focusing arrangement for photographic cameras

Publications (1)

Publication Number Publication Date
GB1204401A true GB1204401A (en) 1970-09-09

Family

ID=9960199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1003268A Expired GB1204401A (en) 1968-03-01 1968-03-01 Focusing arrangement for photographic cameras

Country Status (1)

Country Link
GB (1) GB1204401A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees