Title:
LIGHT QUANTITY ADJUSTMENT DEVICE AND PORTABLE TERMINAL
Document Type and Number:
Japanese Patent JP2022018273
Kind Code:
A
Abstract:
To provide a light quantity adjustment device that can accurately adjust a quantity of light even when a diaphragm member moves in a direction orthogonal to an optical axis.SOLUTION: A light quantity adjustment device comprises: a base member 1 that has a light passage opening 1b; a lens holding member 2 that holds a lens through which light passes and is movable in a direction orthogonal to an optical axis of the light from a reference position; a diaphragm blade 9 that is attached to the lens holding member 2 and advances and retracts in the light passage opening 1b to form a diaphragm aperture; a drive lever 5 that is attached to the lens holding member 2, holds a magnet, and transmits driving force for driving the diaphragm blade 9; and a driving source that has a coil 7 arranged in the base member 1 opposite to the magnet 6 and generates driving force. When the light quantity adjustment device energizes the coil 7 to move the drive lever 5, the light quantity adjustment device corrects an amount of movement of the drive lever 5 according to an amount of movement of the lens holding member 2 from the reference position.SELECTED DRAWING: Figure 9
Inventors:
KAWAKUBO NAOKI
Application Number:
JP2020121268A
Publication Date:
January 27, 2022
Filing Date:
July 15, 2020
Export Citation:
Assignee:
CANON DENSHI KK
International Classes:
G03B9/02; G02B7/02; G02B7/04; G03B5/00; G03B9/06