JPS57204503A - Automatic focusing system - Google Patents

Automatic focusing system

Info

Publication number
JPS57204503A
JPS57204503A JP8987981A JP8987981A JPS57204503A JP S57204503 A JPS57204503 A JP S57204503A JP 8987981 A JP8987981 A JP 8987981A JP 8987981 A JP8987981 A JP 8987981A JP S57204503 A JPS57204503 A JP S57204503A
Authority
JP
Japan
Prior art keywords
focus
lens
objective
image sensor
auxiliary
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
JP8987981A
Other languages
Japanese (ja)
Inventor
Hiroshi Taniguchi
Takehiko Yano
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8987981A priority Critical patent/JPS57204503A/en
Publication of JPS57204503A publication Critical patent/JPS57204503A/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
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals
    • G02B7/365—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals by analysis of the spatial frequency components of the image

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To put an objective in focus automatically by branching and guiding light, passed through the objective, to an auxiliary image sensor. CONSTITUTION:Light passed through an objective 1 is branched by a half-mirror 2 and then guided to an auxiliary image sensor 6 through an auxiliary lens 5. The auxiliary lens 5 is driven forwardly and backwardly periodically by a motor 7 and the image sensor generates an image-forming signal which corresponds to a shift in focus position. The high frequency component of this signal is detected by a detector 12 and led to sample holding circuits 13 and 14. Signals which correspond to the far focus and close focus of the lens 5 are sampled and held synchronously with a driving signal for the lens 5 and a motor 17 is driven by the differential voltage of a differential amplifier 15 to move the objective 1 forth and back. When high frequency signal levels obtained by the image sensor 6 corresponding to the far focus and close focus become equal, the differential amplifier output goes down to zero and the focus position of the lens 1 is determined.
JP8987981A 1981-06-11 1981-06-11 Automatic focusing system Pending JPS57204503A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8987981A JPS57204503A (en) 1981-06-11 1981-06-11 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8987981A JPS57204503A (en) 1981-06-11 1981-06-11 Automatic focusing system

Publications (1)

Publication Number Publication Date
JPS57204503A true JPS57204503A (en) 1982-12-15

Family

ID=13983048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8987981A Pending JPS57204503A (en) 1981-06-11 1981-06-11 Automatic focusing system

Country Status (1)

Country Link
JP (1) JPS57204503A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58118613A (en) * 1982-01-09 1983-07-14 Sankyo Seiki Mfg Co Ltd Automatic focusing device
JPS58105528U (en) * 1982-01-12 1983-07-18 株式会社三協精機製作所 automatic focus device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58118613A (en) * 1982-01-09 1983-07-14 Sankyo Seiki Mfg Co Ltd Automatic focusing device
JPH0126042B2 (en) * 1982-01-09 1989-05-22 Sankyo Seiki Seisakusho Kk
JPS58105528U (en) * 1982-01-12 1983-07-18 株式会社三協精機製作所 automatic focus device
JPH0136163Y2 (en) * 1982-01-12 1989-11-02

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