GB1294097A - Optical system for automatic focussing apparatus - Google Patents

Optical system for automatic focussing apparatus

Info

Publication number
GB1294097A
GB1294097A GB5581869A GB5581869A GB1294097A GB 1294097 A GB1294097 A GB 1294097A GB 5581869 A GB5581869 A GB 5581869A GB 5581869 A GB5581869 A GB 5581869A GB 1294097 A GB1294097 A GB 1294097A
Authority
GB
United Kingdom
Prior art keywords
image
elements
photo
objective lens
outputs
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
GB5581869A
Inventor
Atsushi Someya
Masayuki Miyasaki
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to GB5581869A priority Critical patent/GB1294097A/en
Publication of GB1294097A publication Critical patent/GB1294097A/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
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane
    • G02B7/343—Systems for automatic generation of focusing signals using different areas in a pupil plane using light beam separating prisms

Landscapes

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

Abstract

1294097 Focusing devices CANON K K 14 Nov 1969 55818/69 Heading G2J [Also in Division H4] An optical system comprises two photo-electric elements separated by an image splitting plane, an objective lens, image splitting means and a cylindrical lens the axis of which is perpendicular to the image splitting plane. The cylindrical lens 5 in conjunction with the objective lens 1 produces two images of the object. The first image is produced by the objective lens 1 and the cylindrical lens 2 in the horizontal direction. At the elements 4 1 , 4 2 , this image is defocused and therefore the intensity of the image varies only in the horizontal direction. The second image in the vertical direction is due only to the objective lens 1 and is focused on to the photo-electric elements 4 1 , 4 2 . In a first embodiment the image splitting means is a split prism 3 which deflects the upper and lower halves of the image in opposite directions. The images are only aligned when the image is properly focused on the photo-electric elements 4 1 , 4 2 . In this case the elements have equal outputs. In a second embodiment the image splitting means is provided by having the elements spaced at equal distances from and on opposite sides of the wanted focal point (F). When the outputs of the elements are equal the image will be focused at the correct point. The outputs from the photo-cell elements are used to control the automatic focusing arrangement.
GB5581869A 1969-11-14 1969-11-14 Optical system for automatic focussing apparatus Expired GB1294097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5581869A GB1294097A (en) 1969-11-14 1969-11-14 Optical system for automatic focussing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5581869A GB1294097A (en) 1969-11-14 1969-11-14 Optical system for automatic focussing apparatus

Publications (1)

Publication Number Publication Date
GB1294097A true GB1294097A (en) 1972-10-25

Family

ID=10474974

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5581869A Expired GB1294097A (en) 1969-11-14 1969-11-14 Optical system for automatic focussing apparatus

Country Status (1)

Country Link
GB (1) GB1294097A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT384106B (en) * 1981-10-26 1987-10-12 Sony Corp DEVICE FOR DETERMINING THE DISTANCE FROM AN OBJECT
GB2178621B (en) * 1985-06-28 1990-03-14 Canon Kk Focus detecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT384106B (en) * 1981-10-26 1987-10-12 Sony Corp DEVICE FOR DETERMINING THE DISTANCE FROM AN OBJECT
GB2178621B (en) * 1985-06-28 1990-03-14 Canon Kk Focus detecting device

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Legal Events

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