DICHROIC MIRROR AND PROJECTION TYPE DISPLAY UNIT

WIPO Patent Application WO/2003/083528

A1

A first alternating period layer (5) consisting of low-refractive-index layers (2) and high-refractive-index layers (3), a second alternating period layer (6) consisting of low-refractive-index layers (2) or high-refractive-index layers (3) and intermediate-refractive-index layers (4), and a third alternating period layer (7) consisting of low-refractive-index layers (2) and high-refractive-index layers (3) are provided on a transparent substrate in the order mentioned. 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). In addition, the intermediate-refractive-index layers (4) contain the materials of the low-refractive-index layers (2) and the high-refractive-index layers (3). A dichroic mirror configured in this way has a narrow color separating band between a transmission wavelength band and a reflection wavelength band and therefore has a good color separating efficiency. Accordingly, a projection type display unit using this mirror provides a good color reproducibility while retaining a high spectrum utilization efficiency.

SANNOHE SHINYA (JP)

PCT/JP2003/003934

October 09, 2003

March 28, 2003

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MATSUSHITA ELECTRIC IND CO LTD (JP)
SANNOHE SHINYA (JP)

G02B5/04; G02B5/08; G02B5/26; G02B5/28; G02B5/30; G02B27/18; G03B21/00; G03B21/14; G03B33/12; H04N9/31; F21V7/22; (IPC1-7): G02B5/28; G02B5/04; G02B5/26; G02B27/18; G03B21/00; G03B21/14

JP2001318221A	2001-11-16
JPH11202127A	1999-07-30
JPH11101913A	1999-04-13
US5999321A	1999-12-07

IKEUCHI SATO & PARTNER PATENT ATTORNEYS (OAP TOWER 8-30, Tenmabashi 1-chome, Kita-k, Osaka-shi Osaka, JP)

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