JPS5749904A - Focusing device - Google Patents

Focusing device

Info

Publication number
JPS5749904A
JPS5749904A JP12450980A JP12450980A JPS5749904A JP S5749904 A JPS5749904 A JP S5749904A JP 12450980 A JP12450980 A JP 12450980A JP 12450980 A JP12450980 A JP 12450980A JP S5749904 A JPS5749904 A JP S5749904A
Authority
JP
Japan
Prior art keywords
signal
picture element
focus state
compared
output
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
JP12450980A
Other languages
Japanese (ja)
Inventor
Nobuo Suzuki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12450980A priority Critical patent/JPS5749904A/en
Publication of JPS5749904A publication Critical patent/JPS5749904A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To decide an in-focus state with high precision by performing operation, which corresponds to the forward and backward movements of a lens system by electric processing and by determining the position of the in-focus state. CONSTITUTION:Electric signals A' and B' are generated by the photosensitive parts 9 and 10 of an image sensor 6 respectively. The signals A' and B' for the (i)-th picture element are compared mutually and the resulting output is denoted as C0; and the signal A' for the (i)-th picture element and the signal B' for the (i-k)-th picture element are compared to obtain the output C-, and the signal A' for the (i)-th picture element and the signal B' for the (i+k)-th picture element are compared to obtain the output C+. In this case, the C0 is smallest in an in-focus state as shown by figure 62. When a lens 1 comes close to a main imaging surface 3 from a focusing state as shown by figure 61, the C0 increases and the C- is the smllest. In the opposite case, the C+ signal is smallest as shown by figure 63. Therefore, an in-focus state is decided precisely on the basis of the relation among the C0, C+ and C-.
JP12450980A 1980-09-10 1980-09-10 Focusing device Pending JPS5749904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12450980A JPS5749904A (en) 1980-09-10 1980-09-10 Focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12450980A JPS5749904A (en) 1980-09-10 1980-09-10 Focusing device

Publications (1)

Publication Number Publication Date
JPS5749904A true JPS5749904A (en) 1982-03-24

Family

ID=14887238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12450980A Pending JPS5749904A (en) 1980-09-10 1980-09-10 Focusing device

Country Status (1)

Country Link
JP (1) JPS5749904A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59126517A (en) * 1983-01-10 1984-07-21 Minolta Camera Co Ltd Focusing detector of camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59126517A (en) * 1983-01-10 1984-07-21 Minolta Camera Co Ltd Focusing detector of camera

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