JPS5590936A - Photometric mirror shutter - Google Patents

Photometric mirror shutter

Info

Publication number
JPS5590936A
JPS5590936A JP16280478A JP16280478A JPS5590936A JP S5590936 A JPS5590936 A JP S5590936A JP 16280478 A JP16280478 A JP 16280478A JP 16280478 A JP16280478 A JP 16280478A JP S5590936 A JPS5590936 A JP S5590936A
Authority
JP
Japan
Prior art keywords
aperture
shutter plate
light
ray
plate
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
JP16280478A
Other languages
Japanese (ja)
Inventor
Susumu Matsumura
Kazuya Matsumoto
Akimasa Nishimura
Noritsugu Hirata
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 JP16280478A priority Critical patent/JPS5590936A/en
Publication of JPS5590936A publication Critical patent/JPS5590936A/en
Pending legal-status Critical Current

Links

Landscapes

  • Shutters For Cameras (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To achieve compactification and higher photometric efficiency by specifying the construction of a shutter plate.
CONSTITUTION: A diffraction structure 3 is formed on a part of one surface of an optically transparent plate 2 which is formed to a required shape and a light reflecting layer 4 of aluminum, silver or the like and a light-absorbing layer 5 of black coating layer or the like are formed over the entire part of the other surface to provide the shutter plate 1. Then, when the shutter plate 1 is turned between a relay lens barrel and aperture, the incidence of photographing ray 6 into the aperture is blocked by the light-absorbing layer 5 and when the diffraction structure 3 portion positions on the optical path after this, it is diffracted by the difrraction structure 3 and the n-order diffracted luminous flux 62 out of this enters a photo detector 112 while repeating total reflection within the transparent plate 2, thus the measuring information is applied to an aperture blade control circuit, which in turn allows the ray to enter the aperture when the shutter plate 1 escapes from between the relay lens barrel and aperture. Hence, the shutter plate 1 also functions as a photometric member.
COPYRIGHT: (C)1980,JPO&Japio
JP16280478A 1978-12-29 1978-12-29 Photometric mirror shutter Pending JPS5590936A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16280478A JPS5590936A (en) 1978-12-29 1978-12-29 Photometric mirror shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16280478A JPS5590936A (en) 1978-12-29 1978-12-29 Photometric mirror shutter

Publications (1)

Publication Number Publication Date
JPS5590936A true JPS5590936A (en) 1980-07-10

Family

ID=15761526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16280478A Pending JPS5590936A (en) 1978-12-29 1978-12-29 Photometric mirror shutter

Country Status (1)

Country Link
JP (1) JPS5590936A (en)

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