US 2003/0169507 A1Published application

Production method for optical selection prism

AssigneeSeiko Epson Corporation

InventorsToshiaki Hashizume, Yuji Takado, Takeshi Takezawa

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Abstract

The present invention provides a technique for improving the optical characteristics of a light-selective prism. By cutting a block along a plane perpendicular to a first direction, a plurality of first small blocks are obtained. A first selective film is formed on the cut face of the first small block, and the plurality of first small blocks are stuck together so as to obtain a first processed block in which the first selective film is located at the interface of adjacent two first small blocks. Next, by cutting the first processed block along a plane perpendicular to a second direction that is substantially perpendicular to the first direction, a plurality of second small blocks are obtained. A second selective film is formed on the cut face of the second small block, and the plurality of second small blocks are stuck together to obtain a second processed block in which the second selective film is located at the interface of adjacent two second small blocks. Light-selective prisms in which two kinds of selective films are formed on an almost X shape interface is obtained from the second processed block.

Claims13

Dependent claims

A method for manufacturing a light-selective prism having a substantially regular tetragonal columnar outer shape and including two kinds of selective films formed on an almost X shape interface of the prism, each selective film selecting colored light having wavelengths of a predetermined range, the manufacturing method comprising the steps of:

(a) preparing a block formed of a light transmissive member;
(b) cutting the block along at least one plane perpendicular to a first direction so as to obtain a plurality of first small blocks whose dimension in the first direction is substantially equal to a predetermined dimension;
(c) forming a first selective film on a cut face of at least one of the plurality of the first small blocks;
(d) sticking the plurality of the first small blocks together so as to obtain a first processed block in which the first selective film is situated at an interface of adjacent two first small blocks;
(e) cutting the first processed block along at least one plane perpendicular to a second direction that is substantially perpendicular to the first direction so as to obtain a plurality of second small blocks whose dimension in the second direction is substantially equal to the predetermined dimension;
(f) forming a second selective film on a cut face of at least one of the plurality of the second small blocks;
(g) sticking the plurality of the second small blocks together so as to obtain a second processed block in which the second selective film is situated at an interface of adjacent two second small blocks;
and
(h) obtaining at least one light-selective prism from the second processed block.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/333,797Filed 24 Jan 2003
Priority: JP 2001-2263631 Jan 2001
Published: 11 Sep 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G02B 27/1046
For generating a colour image from monochromatic image signal sources: for use with transmissive spatial light modulators
G02B 27/1073
Beam splitting or combining systems: characterized by manufacturing or alignment methods
G02B 27/145
Operating by reflection only: having sequential partially reflecting surfaces
G02B 27/149
Operating by reflection only: using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes