JPS57132131A - Focusing screen - Google Patents

Focusing screen

Info

Publication number
JPS57132131A
JPS57132131A JP1782381A JP1782381A JPS57132131A JP S57132131 A JPS57132131 A JP S57132131A JP 1782381 A JP1782381 A JP 1782381A JP 1782381 A JP1782381 A JP 1782381A JP S57132131 A JPS57132131 A JP S57132131A
Authority
JP
Japan
Prior art keywords
distance measuring
image
split
subject
distance
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.)
Pending
Application number
JP1782381A
Other languages
Japanese (ja)
Inventor
Susumu Matsumura
Takashi Suzuki
Kazuya Matsumoto
Kikuo Momiyama
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 JP1782381A priority Critical patent/JPS57132131A/en
Publication of JPS57132131A publication Critical patent/JPS57132131A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens
    • G03B13/28—Image-splitting devices

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)

Abstract

PURPOSE:To eliminate the lowering of distance measuring accuracy to a subject image of any type of linear structure, by providing a microprism distance measuring part around a split-image distance measuring part. CONSTITUTION:For a focal plate 1, a split-image distance measuring part 10 is provided with a diffraction grating structure applied on a split-image prism. In addition, a microprism distance measuring part 11 is provided around the part 10. With use of such focal plate 1, the distance can be measured with high accuracy to an ordinary subject having at least a vertical line structure owing to the image splitting and vignette produced through the part 10 causing a reduced shade. On the other hand, the part 11 is used for a subject of only a lateral line structure. In such a way, the measurement of distance is made possible with high accuracy without lowering the accuracy of measurement.
JP1782381A 1981-02-09 1981-02-09 Focusing screen Pending JPS57132131A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1782381A JPS57132131A (en) 1981-02-09 1981-02-09 Focusing screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1782381A JPS57132131A (en) 1981-02-09 1981-02-09 Focusing screen

Publications (1)

Publication Number Publication Date
JPS57132131A true JPS57132131A (en) 1982-08-16

Family

ID=11954441

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1782381A Pending JPS57132131A (en) 1981-02-09 1981-02-09 Focusing screen

Country Status (1)

Country Link
JP (1) JPS57132131A (en)

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