Abstract: A light amount adjusting device includes ND filters rotating around shafts serving as rotation shafts and moving between in-use positions and retracted positions, arranged on a base plate. The respective ND filters include uniform density portions, gradation portions, and transparent portions. If the ND filters are in the retracted positions, the transparent portions of the respective ND filters overlap in an area facing an aperture to cover the entire aperture with the transparent portions. If the ND filters are in the in-use positions, the gradation portions of the respective ND filters overlap in an area facing the aperture to cover the entire aperture with the gradation portions and the uniform density portions. Moreover, a combined density acquired when the gradation portions overlap in just proportion is substantially the same as an optical density of each of the uniform density portions.

Abstract: An optical apparatus includes a stop having an aperture, two filter members each including a first area that includes a transmissive part and a gradation part having a transmittance that is lower than the transmittance of the transmissive part and that is changed in a moving direction of the filter member, an actuator that drives the two filter members, and a controller that controls the actuator. The two filter members are disposed so that both changing directions of densities of the gradation part and moving directions are opposite and the first area has a size capable of covering a whole of a first aperture. The controller controls the actuator so as to always move in an area between a first position and a second position. The transmissive part has a size that is incapable of covering the whole of the first aperture.

Abstract: A shutter device for a camera with an adjustable aperture comprises a connecting member for connection to a camera lens, the connecting member disposed along an optical axis; an image aperture disposed along an extension of the optical axis; and a reflective shutter and a shutter which are configured to cover the image aperture at least over a pre-settable period of time on a connection side of the image aperture facing the connecting member. The reflective shutter is disposed rotatably via a reflective shutter shaft, and the reflective shutter shaft is disposed perpendicularly to a plane of a reflective surface of the reflective shutter. The shutter is rotatably disposed via a shutter shaft, such that a combined shutter region results from projection in a direction of the optical axis to the image aperture, which is composed of a shutter region of the shutter and a shutter region of the reflective shutter.

Abstract: An improved motion picture film projector (100) comprises a Geneva Mechanism (120), which intermittently drives a film (114). A light source (116) projects light through the film (114) and a shutter (106) periodically interrupts the light source (116). The shutter (106) has a blade with a shaped edge, which matches the frame shape on the film (114) thus, increasing the amount of light that is transmitted through the film (114). A second edge of the blade also matches the frame shape on the film (114) further increasing the amount of light transmitted through the film (114).

Abstract: An illumination obscurement device for controlling the obscurement of illumination from a light source which is optimized for use with a rectangular, arrayed, selective reflection device. In a preferred embodiment, a rotatable shutter with three positions is placed between a light source and a DMD. The first position of the shutter is a mask, preferably an out of focus circle. This out of focus circle creates a circular mask and changes any unwanted dim reflection to a circular shape. The second position of the shutter is completely open, allowing substantially all the light to pass. The third position of the shutter is completely closed, blocking substantially all the light from passing. By controlling the penumbra illumination surrounding the desired illumination, DMDs can be used in illumination devices without creating undesirable rectangular penumbras.

Abstract: In a film projection system which contains a light source which emits a large amount of radiant energy and has means for advancing the film through a gate, there is a new and improved shutter comprising a high temperature rated, transmissive substrate having at least one area having a cold mirror coating affixed thereto and a second area with a hot mirror coating affixed thereto such that when the shutter rotates within the projector, the shutter area containing the cold mirror coating is placed in front of the light source when the film is moving through the gate and the shutter area containing the hot mirror coating is placed in front of the light source when the film is located within the gate, such that the thermal deformation of the film caused by the variations in the energy between the time the film is exposed and the time when the film is moving through the gate is minimized.