FR2424556A1 - Camera cinematographique a mise au point automatique - Google Patents

Camera cinematographique a mise au point automatique

Info

Publication number
FR2424556A1
FR2424556A1 FR7910479A FR7910479A FR2424556A1 FR 2424556 A1 FR2424556 A1 FR 2424556A1 FR 7910479 A FR7910479 A FR 7910479A FR 7910479 A FR7910479 A FR 7910479A FR 2424556 A1 FR2424556 A1 FR 2424556A1
Authority
FR
France
Prior art keywords
objective
registers
register
lens
pulse
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
FR7910479A
Other languages
English (en)
Other versions
FR2424556B1 (fr
Inventor
Edwin K Shenk
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.)
Polaroid Corp
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Publication of FR2424556A1 publication Critical patent/FR2424556A1/fr
Application granted granted Critical
Publication of FR2424556B1 publication Critical patent/FR2424556B1/fr
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
    • G02B7/40—Systems for automatic generation of focusing signals using time delay of the reflected waves, e.g. of ultrasonic waves

Landscapes

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

Abstract

PROCEDE POUR POSITIONNER AUTOMATIQUEMENT L'OBJECTIF D'UNE CAMERA POUR MAINTENIR UNE IMAGE D'UN SUJET MISE AU POINT SUR UN PLAN FOCAL D'UN POSTE D'ENREGISTREMENT. IL COMPREND LES ETAPES CONSISTANT A ENGENDRER DES IMPULSIONS DE DISTANCE PERIODIQUES POSSEDANT UNE CARACTERISTIQUE EN RELATION DIRECTE AVEC LA DISTANCE DU SUJET, CONVERTIR CHAQUE IMPULSION EN UN PREMIER NOMBRE QUI REPRESENTE LA POSITION DE MISE AU POINT DEL'OBJECTIF, DETERMINER LA POSITION REELLE DE L'OBJECTIF SOUS LA FORME D'UN SECOND NOMBRE, COMPARER LESDITS PREMIER ET SECOND NOMBRES APRES L'EMISSION DE CHAQUE IMPULSION ET MEMORISER LA DIFFERENCE ENTRE EUX DANS UN PREMIER REGISTRE LORSQUE LE PREMIER NOMBRE EST SUPERIEUR AU SECOND ET DANS UN SECOND REGISTRE LORSQUE LE PREMIER EST INFERIEUR AU SECOND, DETERMINER LEQUEL DES DEUX REGISTRES POSSEDE LE CONTENU LE PLUS GRAND UNE MAJORITE DU TEMPS SUR UN NOMBRE PREDETERMINE D'IMPULSIONS, DEBUTER LE DEPLACEMENT DE L'OBJECTIF LORSQUE LES CONTENUS DE MAJORITE SONT INEGAUX ET METTRE FIN AUDIT DEPLACEMENT LORSQU'ILS SONT EGAUX, ET ETABLIR LE SENS DE DEPLACEMENT DE L'OBJECTIF CONFORMEMENT A CELUI DES DEUX REGISTRES QUI POSSEDE LE CONTENU LE PLUS GRAND.
FR7910479A 1978-04-25 1979-04-25 Camera cinematographique a mise au point automatique Expired FR2424556B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US89978578A 1978-04-25 1978-04-25

Publications (2)

Publication Number Publication Date
FR2424556A1 true FR2424556A1 (fr) 1979-11-23
FR2424556B1 FR2424556B1 (fr) 1986-01-10

Family

ID=25411561

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7910479A Expired FR2424556B1 (fr) 1978-04-25 1979-04-25 Camera cinematographique a mise au point automatique

Country Status (9)

Country Link
JP (1) JPS54158226A (fr)
AT (1) AT370886B (fr)
AU (1) AU528360B2 (fr)
CA (1) CA1124125A (fr)
CH (1) CH646797A5 (fr)
DE (1) DE2916569A1 (fr)
FR (1) FR2424556B1 (fr)
GB (1) GB2019595B (fr)
IT (1) IT1112710B (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335942A (en) * 1979-10-26 1982-06-22 Canon Kabushiki Kaisha Camera provided with automatic focus detector
JPS5749907A (en) * 1980-09-09 1982-03-24 Ricoh Co Ltd Noise eliminating circuit and in-focus detecting circuit
JPS5772115A (en) * 1980-10-23 1982-05-06 Canon Inc Output stablizing circuit for focus detector
JPS57128307A (en) * 1981-02-03 1982-08-09 Nippon Kogaku Kk <Nikon> Automatic focus adjuster
JPS57169710A (en) * 1981-04-10 1982-10-19 West Electric Co Ltd Automatic focusing device
JPS587113A (ja) * 1981-07-06 1983-01-14 Fuji Photo Optical Co Ltd 多点測光によるオ−トフオ−カス装置
JPS58198009A (ja) * 1982-05-14 1983-11-17 West Electric Co Ltd 超音波オ−トフオ−カス装置
JPS60135712U (ja) * 1984-02-20 1985-09-09 三洋電機株式会社 自動焦点カメラ
JPS60214320A (ja) * 1984-04-11 1985-10-26 Kowa Co 自動焦点調節装置
GB2161947B (en) * 1984-06-08 1988-06-29 Konishiroku Photo Ind Automatic focusing camera
JPS6127107U (ja) * 1984-07-23 1986-02-18 ライトロン株式会社 オ−トフオ−カス装置
JPH0224421A (ja) * 1988-07-13 1990-01-26 Sadajiro Amiya 擁壁コンクリートブロック及び擁壁の成形方法
JPH0430024A (ja) * 1990-05-25 1992-02-03 Sekisui House Ltd プレキャストコンクリート製地下室

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530874A1 (de) * 1974-07-10 1976-01-29 Asahi Optical Co Ltd Verfahren und einrichtung zur fokussierung eines optischen systems
DE2522757A1 (de) * 1975-05-22 1976-12-09 Walter Landsrath Automatischer entfernungsmesser fuer optische systeme

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4078171A (en) * 1976-06-14 1978-03-07 Honeywell Inc. Digital auto focus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530874A1 (de) * 1974-07-10 1976-01-29 Asahi Optical Co Ltd Verfahren und einrichtung zur fokussierung eines optischen systems
DE2522757A1 (de) * 1975-05-22 1976-12-09 Walter Landsrath Automatischer entfernungsmesser fuer optische systeme

Also Published As

Publication number Publication date
AU4628679A (en) 1979-11-01
IT7922114A0 (it) 1979-04-24
CH646797A5 (de) 1984-12-14
AU528360B2 (en) 1983-04-28
AT370886B (de) 1983-05-10
FR2424556B1 (fr) 1986-01-10
IT1112710B (it) 1986-01-20
GB2019595A (en) 1979-10-31
ATA309979A (de) 1982-09-15
DE2916569C2 (fr) 1990-11-08
JPS54158226A (en) 1979-12-13
CA1124125A (fr) 1982-05-25
GB2019595B (en) 1982-09-29
DE2916569A1 (de) 1979-11-08
JPS6226449B2 (fr) 1987-06-09

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Legal Events

Date Code Title Description
ST Notification of lapse