Dielectric multilayer filter
First Claim
1. A dielectric multilayer filter comprising:
- a transparent substrate;
a first dielectric multilayer film having a predetermined reflection band formed on one surface of said transparent substrate; and
a second dielectric multilayer film having a predetermined reflection band formed on the other surface of said transparent substrate, wherein the width of the reflection band of said first dielectric multilayer film is set narrower than the width of the reflection band of said second dielectric multilayer film, and the shorter-wavelength-side edge of the reflection band of said second dielectric multilayer film is set between the shorter-wavelength-side edge and the longer-wavelength-side edge of the reflection band of said first dielectric multilayer film.
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Accused Products
Abstract
To provide a dielectric multilayer filter, such as an IR cut filter and a red-reflective dichroic filter, that produces an effect of reducing incident-angle dependency and has a wide reflection band. A first dielectric multilayer film 30 is formed on the front surface of a transparent substrate 28, and a second dielectric multilayer film 32 is formed on the back surface of the transparent substrate 28. The width W1 of the reflection band of the first dielectric multilayer film 30 is set narrower than the width W2 of the reflection band of the second dielectric multilayer film 32. The half-value wavelength E2L of the shorter-wavelength-side edge of the reflection band of the second dielectric multilayer film 32 is set between the half-value wavelength E1L at the shorter-wavelength-side edge and the half-value wavelength E1H at the longer-wavelength-side edge of the reflection band of the first dielectric multilayer film 30.
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Citations
10 Claims
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1. A dielectric multilayer filter comprising:
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a transparent substrate;
a first dielectric multilayer film having a predetermined reflection band formed on one surface of said transparent substrate; and
a second dielectric multilayer film having a predetermined reflection band formed on the other surface of said transparent substrate, wherein the width of the reflection band of said first dielectric multilayer film is set narrower than the width of the reflection band of said second dielectric multilayer film, and the shorter-wavelength-side edge of the reflection band of said second dielectric multilayer film is set between the shorter-wavelength-side edge and the longer-wavelength-side edge of the reflection band of said first dielectric multilayer film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification