Dichroic mirror and projection-type display unit

Details Dichroic mirror and projection-type display unit Dichroic mirror and projection-type display unit

2007-01-23

2007-01-23

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S037000, C353S098000, C359S634000

Reexamination Certificate

active

10508071

ABSTRACT:
On a transparent substrate (1), a first alternating periodic layer (5) including low-refractive-index layers (2) and high-refractive-index layers (3), a second alternating periodic layer (6) including the low-refractive-index layers (2) or the high-refractive-index layers (3) and intermediate-refractive-index layers (4), and a third alternating periodic layer (7) including the low-refractive-index layers (2) and the high-refractive-index layers (3) are provided in this order. The refractive index of the intermediate-refractive-index layers (4) is higher than that of the low-refractive-index layers (2) and lower than that of the high-refractive-index layers (3). Furthermore, the intermediate-refractive-index layers (4) contain materials for the low-refractive-index layers (2) and the high-refractive-index layers (3). A dichroic mirror thus configured has a narrow color separating band between a transmission wavelength band and a reflection wavelength band, and therefore has a satisfactory color separating efficiency. Accordingly, a projection-type display unit using the dichroic mirror provides satisfactory color reproduction while retaining a high spectrum utilization efficiency.

REFERENCES:
patent: 5999321 (1999-12-01), Bradley
patent: 6310729 (2001-10-01), Tsukamoto
patent: 2002/0135706 (2002-09-01), Sawamura
patent: 4-372922 (1992-12-01), None
patent: 11-101913 (1999-04-01), None
patent: 11-202127 (1999-07-01), None
patent: 2001-318221 (2001-11-01), None

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