LIGHT QUANTITY CONTROL APPARATUS

Title:

LIGHT QUANTITY CONTROL APPARATUS

Document Type and Number:

Japanese Patent JP2015172670

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To provide a light quantity control apparatus configured to reduce the driving force and time required for moving a shutter blade and a light quantity adjustment member.SOLUTION: A light quantity control apparatus includes: a light quantity regulation member with an opening; a magnet rotor which may be rotated around an axis parallel to an optical axis; a yoke having a magnetic pole section facing an outer peripheral surface of the magnet rotor; a first coil wound on the yoke; a bobbin which may be rotated coaxially with the magnet rotor; a second coil wound on the bobbin so as to cover the magnet rotor; a first light quantity adjustment member which is engaged with the magnet rotor rotated by power supplied to the first coil, and moves in the opening; and a second light quantity adjustment member which is engaged with the bobbin rotated by power supplied to the second coil, and moves in the opening.

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Inventors:

UEDA AKIHIKO

Application Number:

JP2014048705A

Publication Date:

October 01, 2015

Filing Date:

March 12, 2014

Export Citation:

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Assignee:

CANON KK

International Classes:

G03B9/02; H02K33/16

Attorney, Agent or Firm:

Ryosuke Fujimoto
Atsushi Mizumoto
Hirayama Tomoya

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