Projection optical system and light amount adjusting...

Details Projection optical system and light amount adjusting... Projection optical system and light amount adjusting...

2011-08-09

2011-08-09

Sohn, Seung C (Department: 2878)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C355S053000, C355S067000

Reexamination Certificate

active

07993018

ABSTRACT:
A light amount adjusting component adapted a projection optical system is provided. The light amount adjusting component has a light incident surface upon which a light beam impinges, and the light incident surface is provided with a surface structure for irregularly dispersing the light beam. A slot that permits the light beam to pass therethrough and enter a light-receiving element is formed on the light amount adjusting component, and a width of the slot changes along an extension direction of the slot to allow control of the amount of the light beam entering the light-receiving element when the light amount adjusting component moves or rotates.

REFERENCES:
patent: 6597430 (2003-07-01), Nishi et al.
patent: 7287864 (2007-10-01), Shirasu et al.
patent: 2007/0133208 (2007-06-01), Smith et al.
patent: I259829 (2006-08-01), None

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