JPS5455428A - Automatic exposing device - Google Patents

Automatic exposing device

Info

Publication number
JPS5455428A
JPS5455428A JP12217577A JP12217577A JPS5455428A JP S5455428 A JPS5455428 A JP S5455428A JP 12217577 A JP12217577 A JP 12217577A JP 12217577 A JP12217577 A JP 12217577A JP S5455428 A JPS5455428 A JP S5455428A
Authority
JP
Japan
Prior art keywords
shutter time
accordance
shutter
information
time
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
JP12217577A
Other languages
Japanese (ja)
Inventor
Toshio Sakane
Tokuichi Tsunekawa
Mitsuya Hosoe
Makoto Masunaga
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 JP12217577A priority Critical patent/JPS5455428A/en
Priority to US05/949,557 priority patent/US4264161A/en
Priority to DE2844339A priority patent/DE2844339A1/en
Publication of JPS5455428A publication Critical patent/JPS5455428A/en
Priority to US06/171,253 priority patent/US4320948A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Control For Cameras (AREA)
  • Shutter-Related Mechanisms (AREA)

Abstract

PURPOSE: To prevent the condition of being out of focus due to the movement of an object by detecting the movement of the object upon a focal plane so that the shutter time second may be automatically determined in accordance with the moving velocity.
CONSTITUTION: Let is be assumed that the brightness of an object which is obtained from a photometric circuit is at a level of EV 15. In this instance, the shuter time second information Tv "min and Tv" max for ensuring proper exposure are calculated in accordance with the iris aperture information Avmax and Avmin fed from the lens and the Ev value. Then, the ranges Tv' min and Tv' max of the shutter time second, which are restricted by a shutter mechanism, are compared with the calcualted results so that the shortest and longest information Tvmax and Tvmin of the shutter time second corresponding to the EV value is selected within the iris and shutter time second coacting range, as shown in hatched lines. Here, Tb and Tc of the Drawing are selected in accordance with the shutter time second T' which is preset manually. If the selected values are located out of the coactive range, the approximate extreme values Ta"' and Tb"' are selected as the shutter time second
COPYRIGHT: (C)1979,JPO&Japio
JP12217577A 1977-10-12 1977-10-12 Automatic exposing device Pending JPS5455428A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP12217577A JPS5455428A (en) 1977-10-12 1977-10-12 Automatic exposing device
US05/949,557 US4264161A (en) 1977-10-12 1978-10-10 Motion detecting device in exposure control system for optical instruments
DE2844339A DE2844339A1 (en) 1977-10-12 1978-10-11 MOTION DETECTION DEVICE IN AN EXPOSURE CONTROL SYSTEM FOR OPTICAL DEVICES
US06/171,253 US4320948A (en) 1977-10-12 1980-07-22 Motion detecting device in exposure control system for optical instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12217577A JPS5455428A (en) 1977-10-12 1977-10-12 Automatic exposing device

Publications (1)

Publication Number Publication Date
JPS5455428A true JPS5455428A (en) 1979-05-02

Family

ID=14829420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12217577A Pending JPS5455428A (en) 1977-10-12 1977-10-12 Automatic exposing device

Country Status (1)

Country Link
JP (1) JPS5455428A (en)

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