Title:
APERTURE-PRIORITY TYPE LENS SHUTTER DEVICE
Document Type and Number:
Japanese Patent JP2502472
Kind Code:
B2
Abstract:
PURPOSE: To provide an aperture-priority type lens shutter device for a camera having compact structure and capable of being actuated for a fully automatic exposure and aperture-priority type.
CONSTITUTION: A pair of lens shutter blades 64 and 66 are rotatably attached to an opposite side to a cylinder part 4, so as to cover the aperture part of a lens mount 2 having a hollow cylinder part 4 and a flange 6. The blades 64 and 66 are opened/closed by the AE cam 14 of an AE ring 10. The AE ring 10 is interlocked with a rotor 12, constituting a pulse motor and driven to be rotated by the excitation of stators 50 and 52. The amount of opening for the blades 64 and 66 is decided according to a diaphragm value, and the time interval for opening is decided, in accordance with the exposure time. In a semi-automatic operation mode, a CPU calculates the time to keep exposure at a set diaphragm value by prioritizing the diaphragm value which has been manually set, and then calculates the total exposure time by adding up the exposure times obtained from a control time table with the calculated time to keep the exposure.
Inventors:
JO ZAIKEI
SAI TOKUHIRO
RI SENKO
SAI TOKUHIRO
RI SENKO
Application Number:
JP28631793A
Publication Date:
May 29, 1996
Filing Date:
November 16, 1993
Export Citation:
Assignee:
SAM SUNG AEROSPACE IND
International Classes:
G03B7/097; G03B7/093; G03B9/08; G03B9/14; G03B9/24; G03B9/62; (IPC1-7): G03B7/097; G03B9/14
Domestic Patent References:
| JP3116032A | ||||
| JP4314038A |
Attorney, Agent or Firm:
Fujiya Shiga (1 person outside)