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Parabolic dielectric multilayer reflector
| Details |
Inventors: Narita, Mitsuo; Okazaki, Yoshio; Ukai, Toshiya;
Assignee: Ushiodenki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Lerner; Martin
Assistant Examiner:
Attorney, Agent or Firm: Keck, Mahin & Cate
A reflector used for a light source material of a liquid crystal video projector provides a good projection image and causes no color shading to occur in the periphery of a screen. The reflector has a surface on which a dielectric multifilm coating is deposited. The reflector reflects only visible light beams and has a wavelength .lambda..sub.1, which has a spectral transmittance on a short wave side (with normal incidence) of 20% and is equal to or smaller than 440 nm and, at the same time, has a wavelength .lambda..sub.2, which has a spectral transmittance on a long wave side (with normal incidence) of 50% and is equal to or greater than 820 nm. |
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DETAILED DESCRIPTION The object of the invention is consequently to provide a reflector, in which in the case of use for a light source material of a liquid crystal video projector no colour shading occurs in the periphery of a screen and which has a good projection image.
According to the invention this object is achieved in that a reflector, onto whose surface is deposited a dielectric multifilm coating and which only reflects visible light beams, has a reflection characteristic, at which a wavelength .
lambda.
.
sub.
1, which as a spectral transmittance on a short wave side (in the case of normal incidence) of 20% is equal to or smaller than 440 nm, and a wavelength .
lambda.
.
sub.
2, which has a spectral transmittance on a long wave side (in the case of normal incidence) of 50% is equal to or larger than 820 nm.
This reflection characteristic was discovered as a consequence of the research of the inventors, in which by different types of changes to the deposition conditions of the multifilm coating (number of films, coating thickness, refractive index) colour shadings projected onto a screen were investigated.
The inventors namely found that as a result of the measure by which a wavelength width of the light reflected by means of the reflector, i.
e.
a so-called reflection wavelength width (.
lambda.
.
sub.
2 -.
lambda.
.
sub.
1), which is equal to or greater than a given value, and by which at the same time the wavelength .
lambda.
.
sub.
1 and the wavelength .
lambda.
.
sub.
2 are determined in the above-described manner, the reflection characteristic difference between the p-polarized light and the s-polarized light has no influence in the form of colour shading on the screen.
As a result of the above-described measure, in which the reflection wavelength width is widened and at the same time its range is determined, it is possible to reduce the colour shading projected onto the screen.
In order to widen the reflection wavelength width, it is conventionally necessary to increase the number of films of the multifilm coating or the coating thickness
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