Patent ID: 8934031
Filing Date: 2015-01-13
Classification: G02B,G03B,H04N

Abstract:
1. A light intensity control device comprising: an aperture stop part provided with an opening part having a of first opening area thereby controlling flux of incident light to a predetermined size; a light extinction part having a first area whose transmissivity for the incident light is more than a first value and a second area whose transmissivity for the incident light is a second value smaller than the first value, the light extinction part being adapted to be movable between its first blocking state where the first area covers the opening part completely and a second light blocking state a second light blocking state where the second area covers the opening part completely; and a light intensity aperture part having a plurality of movable aperture blades to further limit a light intensity of light transmitted through the opening part by moving the plurality of aperture blades so that the size of an opening defined by the aperture blades against the opening part is changed from the first opening area to a second opening area smaller than the first opening area, wherein: