Light filter having a wedge-shaped profile
First Claim
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1. A light filter, comprising:
- exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction;
a first transparent layer, disposed atop the partially reflective layer, comprising at least three dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction;
a second transparent layer, disposed on the bottom of the partially reflective layer, comprising at least three dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction.
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Abstract
A light filter includes exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction. First and second transparent layers are disposed on the top and bottom, respectively, of the partially reflective layer, each transparent layer including at least two dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction. A photospectrometer including a light filter with the wedge-shaped profile is also disclosed.
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Citations
20 Claims
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1. A light filter, comprising:
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exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction; a first transparent layer, disposed atop the partially reflective layer, comprising at least three dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction; a second transparent layer, disposed on the bottom of the partially reflective layer, comprising at least three dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A light filter, comprising:
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exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction; a first transparent layer, disposed on top of the partially reflective layer, comprising at least two dielectric layers of differing materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction; and a second transparent layer, disposed on the bottom of the partially reflective layer, comprising at least two dielectric layers of differing materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction. - View Dependent Claims (12, 13, 14, 15)
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16. A photospectrometer, comprising:
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a substrate; a plurality of photodiodes disposed upon the substrate, each photodiode being electrically coupled to sensing circuitry for receiving a signal representative of light intensity sensed by the respective photodiode; and a light filter disposed over the photodiodes, comprising exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction; a first transparent layer, disposed on top of the partially reflective layer, comprising at least three dielectric layers of two differing materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction; a second transparent layer, disposed on the bottom of the partially reflective layer, comprising at least three dielectric layers of two differing materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction. - View Dependent Claims (17, 18, 19, 20)
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Specification