Patent ID: 8675123
Filing Date: 2014-03-18
Classification: G03B

Abstract:
1. A light amount adjustment device, comprising: a first stepping motor; a second stepping motor; a first driven member configured to be driven by said first stepping motor; a second driven member configured to be driven by said second stepping motor; a light shield member configured to change an amount of light passing through an optical path according to a relative positional relation between said first and second driven members; and a lock member configured to be changed between a lock state where said lock member locks said first driven member and a release state where the lock state is released, wherein an amount of movement of said light shield member when said second stepping motor is driven one step to drive said second driven member is smaller than an amount of movement of said light shield member when said first stepping motor is driven one step to drive said first driven member, and said lock member locks said first driven member when said second stepping motor drives said second driven member.