FR2308119A1 - Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system - Google Patents

Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system

Info

Publication number
FR2308119A1
FR2308119A1 FR7512166A FR7512166A FR2308119A1 FR 2308119 A1 FR2308119 A1 FR 2308119A1 FR 7512166 A FR7512166 A FR 7512166A FR 7512166 A FR7512166 A FR 7512166A FR 2308119 A1 FR2308119 A1 FR 2308119A1
Authority
FR
France
Prior art keywords
displacement motor
aerial camera
optical system
light intensity
optical unit
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
FR7512166A
Other languages
French (fr)
Other versions
FR2308119B3 (en
Inventor
Francois Pointeau
Daniel Enard
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.)
Engins Matra SA
Original Assignee
Engins Matra SA
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 Engins Matra SA filed Critical Engins Matra SA
Priority to FR7512166A priority Critical patent/FR2308119A1/en
Publication of FR2308119A1 publication Critical patent/FR2308119A1/en
Application granted granted Critical
Publication of FR2308119B3 publication Critical patent/FR2308119B3/fr
Granted 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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

The automatic focussing device is for an aerial camera having an optical unit which is displaced by a motor with respect to a film carrier, so as to produce a focus. It has two diaphragms whose optical distances, with respect to the optical unit, is for one shorter by a/2 than the distance from the optical unit to the film location, and for the other, greater than a/2. The system has two detection channels each of which is sensitive to the light which has paned through one of the diaphragms. The detectors produce an electrical signal which represents the modulation intensity of the light. The signal is sent to a differential analyser which controls the displacement motor of the optical unit.
FR7512166A 1975-04-18 1975-04-18 Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system Granted FR2308119A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7512166A FR2308119A1 (en) 1975-04-18 1975-04-18 Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7512166A FR2308119A1 (en) 1975-04-18 1975-04-18 Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system

Publications (2)

Publication Number Publication Date
FR2308119A1 true FR2308119A1 (en) 1976-11-12
FR2308119B3 FR2308119B3 (en) 1978-10-06

Family

ID=9154160

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7512166A Granted FR2308119A1 (en) 1975-04-18 1975-04-18 Automatic focussing for aerial camera - uses modulation of light intensity to control displacement motor of optical system

Country Status (1)

Country Link
FR (1) FR2308119A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232970A (en) * 1977-04-30 1980-11-11 Olympus Optical Co., Ltd. Apparatus for automatic diagnosis of cells
EP0080340A1 (en) * 1981-11-19 1983-06-01 Olympus Optical Co., Ltd. A device for detecting the focused state of an optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4232970A (en) * 1977-04-30 1980-11-11 Olympus Optical Co., Ltd. Apparatus for automatic diagnosis of cells
EP0080340A1 (en) * 1981-11-19 1983-06-01 Olympus Optical Co., Ltd. A device for detecting the focused state of an optical system

Also Published As

Publication number Publication date
FR2308119B3 (en) 1978-10-06

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