Light amount adjusting device and projector using the same

Details Light amount adjusting device and projector using the same Light amount adjusting device and projector using the same

2007-10-30

2007-10-30

Dowling, William C. (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

Reexamination Certificate

active

11132327

ABSTRACT:
A light amount adjusting device is assembled in a projector having a light source and a projection device projecting light from the light source on a screen through an image forming panel. The light amount adjusting device is arranged in the projection device or between the light source and the projection device. The light amount adjusting device includes a substrate having an optical path opening so that light from the light source passes therethrough; a blade member for adjusting quantity of light passing through the optical path opening; and a driving device for opening and closing the blade member. The blade member includes a base member formed of a polyimide sheet or a polyester sheet having heat resistance withstanding heat of the light source. A light blocking material is laminated on the base member. Accordingly, it is possible to provide the light amount adjusting device with a simple structure and easy assembly and the projector using the same capable of reducing deformation of the blade member due to heat and precisely adjusting amount of light without an influence of the deformation.

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patent: 2007/0046905 (2007-03-01), Takeuchi et al.
patent: 2007/0153238 (2007-07-01), Takeuchi et al.

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