Optical element having wavelength selectivity
First Claim
1. An optical element having a wavelength selectivity characterized by comprising:
- a light guide plate (22) having opposing two end faces (22a, 22b); and
a multilayered film filter (23) which is formed on at least one of the opposing two end faces of the light guide plate and includes high-refractive-index dielectric layers and low-refractive-index dielectric layers laminated alternately and whose thickness continuously changes in accordance with a position of the associated end face of the light guide plate.
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Accused Products
Abstract
An optical element having a wavelength selectivity, which is easy to manufacture and reduces the manufacturing cost. The optical element comprises a light guide plate (22) having opposing two end faces (22a, 22b), and a multilayered film filter (23) formed on at least one of the opposing two end faces of the light guide plate. The multilayered film filter includes high-refractive-index dielectric layers and low-refractive-index dielectric layers laminated alternately and its thickness continuously changes in accordance with a position of the associated end face of the light guide plate. The center wavelength of transmitted light from the multilayered film filter differs in accordance with the position of the end face of the light guide plate. In a case where mixed light is input to the multilayered film filter from individual lenses via the light guide plate, the mixed light is separated to lights of different center wavelengths by the multilayered film filter that has different thicknesses.
35 Citations
32 Claims
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1. An optical element having a wavelength selectivity characterized by comprising:
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a light guide plate (22) having opposing two end faces (22a, 22b); and
a multilayered film filter (23) which is formed on at least one of the opposing two end faces of the light guide plate and includes high-refractive-index dielectric layers and low-refractive-index dielectric layers laminated alternately and whose thickness continuously changes in accordance with a position of the associated end face of the light guide plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An optical element having a wavelength selectivity characterized by comprising:
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a light guide plate (22) having opposing two end faces (22a, 22b);
a lens array (26C) arranged on one (22a) of the two end faces of the light guide plate and having a plurality of lenses; and
a multilayered film filter (23) which is formed on at least one of an outer surface of the lens array and the other one (22b) of the two end faces of the light guide plate and includes high-refractive-index dielectric layers and low-refractive-index dielectric layers laminated alternately and whose thickness continuously changes in accordance with a position of the end face of the light guide plate. - View Dependent Claims (23, 24, 25, 26, 27, 30, 31, 32)
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22. An optical element having a wavelength selectivity characterized by comprising:
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a light guide plate (22) having opposing two end faces (22a, 22b);
a lens array (26C) arranged on one (22a) of the two end faces of the light guide plate and having a plurality of lenses;
a reflection film (24), formed on the other one (22b) of the two end faces of the light guide plate, for reflecting light input to the light guide plate; and
a multilayered film filter (23) which is formed on an outer surface of the lens array and includes high-refractive-index dielectric layers and low-refractive-index dielectric layers laminated alternately and whose thickness continuously changes in accordance with a position of the end face of the light guide plate. - View Dependent Claims (28, 29)
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Specification