GB2013353A - Camera focus control system - Google Patents

Camera focus control system

Info

Publication number
GB2013353A
GB2013353A GB7848907A GB7848907A GB2013353A GB 2013353 A GB2013353 A GB 2013353A GB 7848907 A GB7848907 A GB 7848907A GB 7848907 A GB7848907 A GB 7848907A GB 2013353 A GB2013353 A GB 2013353A
Authority
GB
United Kingdom
Prior art keywords
lens
region
focusing
reference point
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
GB7848907A
Other versions
GB2013353B (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.)
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 GB2013353A publication Critical patent/GB2013353A/en
Application granted granted Critical
Publication of GB2013353B publication Critical patent/GB2013353B/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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/08—Systems for measuring distance only
    • G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optics & Photonics (AREA)
  • Focusing (AREA)
  • Lens Barrels (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

A focus control system in a photographic camera, for example, includes a rangefinder (14) (preferably acoustic) and driving means (38) responsive to a signal from the rangefinder for moving a movable element of a variable focus lens to a focused position. In addition to being movable throughout a first region in which it focuses at an image plane images of objects within a given range, the lens is also movable in a second region which is outside its focusing region. Prior to an automatic focusing operation, the lens is always returned to this second region, so that automatic focusing movement is unidirectional and always starts from the same reference point. The return movement of the lens to the reference point may be a part of an automobile focusing and exposure cycle, in a camera. Where provision is made for manually focusing the lens, as an alternative to automatic focusing, means may be provided for automatically returning the lens to its reference point after a manual exposure cycle in the camera. <IMAGE>
GB7848907A 1977-12-30 1978-12-18 Focus control system for variable focus lenses Expired GB2013353B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86585277A 1977-12-30 1977-12-30

Publications (2)

Publication Number Publication Date
GB2013353A true GB2013353A (en) 1979-08-08
GB2013353B GB2013353B (en) 1982-05-19

Family

ID=25346383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7848907A Expired GB2013353B (en) 1977-12-30 1978-12-18 Focus control system for variable focus lenses

Country Status (9)

Country Link
JP (1) JPS54109837A (en)
AT (1) AT377101B (en)
AU (1) AU525816B2 (en)
CA (1) CA1122455A (en)
CH (1) CH637222A5 (en)
DE (1) DE2856573A1 (en)
FR (1) FR2413680A1 (en)
GB (1) GB2013353B (en)
IE (1) IE48251B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133566A (en) * 1983-01-06 1984-07-25 Canon Kk Variable magnification projector having zoom lens

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1151929A (en) * 1980-03-03 1983-08-16 Kenneth C. Kiesel Focusing system and method with adjustment for lens depth of focus
WO2018139168A1 (en) 2017-01-27 2018-08-02 富士フイルム株式会社 Camera system, camera, lens, accessory, and method for detecting camera system accessory

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2105288B2 (en) * 1970-02-14 1973-03-15 Kabushiki Kaisha Ricoh, Tokio CAMERA WITH AUTOMATIC FOCUSING
US3917395A (en) * 1973-06-28 1975-11-04 Honeywell Inc Control circuit for photographic apparatus
CA1099554A (en) * 1976-10-04 1981-04-21 Polaroid Corporation Automatic range finding and focussing camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133566A (en) * 1983-01-06 1984-07-25 Canon Kk Variable magnification projector having zoom lens

Also Published As

Publication number Publication date
ATA1279A (en) 1984-06-15
FR2413680B1 (en) 1983-11-18
AU4306279A (en) 1979-07-05
AT377101B (en) 1985-02-11
DE2856573A1 (en) 1979-07-05
FR2413680A1 (en) 1979-07-27
CA1122455A (en) 1982-04-27
GB2013353B (en) 1982-05-19
AU525816B2 (en) 1982-12-02
JPS54109837A (en) 1979-08-28
CH637222A5 (en) 1983-07-15
IE782563L (en) 1979-06-30
IE48251B1 (en) 1984-11-14

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Legal Events

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