Beam splitter for color imaging equipment
AssigneesMatsushita Electric Industrial Co., Ltd., Fuji Photo Optical Co., Ltd.
InventorsTatsuki Tsukada, Hiroshi Nakamura, Kazuto Tanaka
Life of this patent
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Abstract
A beam splitter of a color imaging equipment includes three prism blocks for red, green and blue channels, connecting members for connecting the red channel prism block and the blue channel prism block via an air-gap, and supporting plates for supporting these prism blocks. The connecting members have the same or smaller expansion coefficient as the prism blocks. The supporting plates are connected to the green channel prism block, and substantially not connected to the red and blue channel prism blocks and the connecting members. Consequently, the air-gap between the red and blue channel prism blocks are not affected by the expansion/shrinkage of the supporting plates, and thereby the registration characteristic is improved.
Claims9
A Beam splitter for a color imaging equipment, including red, green and blue channel prism blocks for separating incident beams into three primary colors of red green and blue, and comprising;
- connecting member means for connecting said red channel prism block and said blue channel prism block, said connecting member means being provided on the surfaces of said red and blue channel prism blocks by striding across a joint portion containing an air-gap between said both blocks, and having an expansion coefficient which is identical to or smaller than that of said prism blocks;
- and
- supporting plate means which are connected to said green channel prism block and are substantially not connected to said red and blue channel prism blocks and said connecting member means.
Dependencies are inferred from the claim text.