Title:
LIGHT QUANTITY CONTROL DEVICE, CONTROL METHOD THEREOF, CONTROL PROGRAM, AND OPTICAL DEVICE
Document Type and Number:
Japanese Patent JP2020027175
Kind Code:
A
Abstract:
To perform motor control for acceleration at low cost in a light quantity control device for performing light quantity adjustment.SOLUTION: A light quantity control device opens and closes a diaphragm blade 121 by driving of a motor 110. A drive control part 150 drives the motor by performing energization on the basis of prescribed control information by a drive circuit 140, and changes an energization time to the motor in accordance with the position of the diaphragm blade to increase the energization time more as the driving position of the diaphragm blade is moved in a closing direction in driving the diaphragm blade in the closing direction.SELECTED DRAWING: Figure 7
Inventors:
ABE RYO
Application Number:
JP2018151765A
Publication Date:
February 20, 2020
Filing Date:
August 10, 2018
Export Citation:
Assignee:
CANON KK
International Classes:
G03B9/02; G02B7/08; G03B9/06; H02P8/18; H02P8/38
Attorney, Agent or Firm:
Another role Shigehisa