Patent ID: 8654455
Filing Date: 2014-02-18
Classification: G03B

Abstract:
1. A light quantity adjustment apparatus for adjusting a quantity of light passing through an optical-axis aperture with a plurality of blade members, comprising: a ring-shaped board having an optical-axis aperture in a center portion thereof; a plurality of blade members disposed around the optical-axis aperture to overlap in the shape of scales in a circumferential direction; a driving ring disposed with the plurality of blade members sandwiched between the board and the ring to open and close each of the blade members; and driving means for rotating the driving ring about the optical-axis aperture, wherein in between the board and the driving ring is provided an elastic member in a position facing the plurality of blade members, and the elastic member is disposed between the board and each of the blade members and has an elastic force to press each of the blade members against the driving ring side, or is disposed between the driving ring and the blade members and has an elastic force to press each of the blade members against the board side.