Optics: image projectors – Color filter
Reexamination Certificate
2007-02-06
2007-02-06
Perkey, W. B. (Department: 2851)
Optics: image projectors
Color filter
C353S020000, C353S037000, C359S487030, C359S488010, C359S584000, C359S586000, C359S589000, C349S105000, C349S106000
Reexamination Certificate
active
10469130
ABSTRACT:
A multi-layer film, wherein a ratio H/L or L/H, a balance in optical film thickness between a high-refractive-index layer H and a low-refractive-index layer L, is set within a range of 1.2–2.0 to bias a balance in thickness. A method of producing a dielectric multi-layer film, wherein, when a dielectric multi-layer film is formed, a proportion at which an optical film thickness is formed on a monitor substrate is made larger than usual. A UV reflection film, having a step difference in average transmittance of 70–90% at a specified half-power point and within a wavelength range of 430–450 nm, is provided on a substrate to form a UV cut filter. A UV reflection film at a specified half-power point, a step difference in average transmittance of 70–90% within a wavelength range of 430–450 nm, and a blue conditioning film having a transmittance of at least 90% within a wavelength range of 460–520 nm may be combined. This UV cut filter is applied to the projection type display unit of a ultra-high pressure mercury lamp light source. The UV reflection film may be provided on the dustproof glass of a display unit.
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Uchidani Takahiro
Yano Kunihiko
Blackman Rochelle
Perkey W. B.
Seiko Epson Corporation
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