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US 8,767,294 B2Granted
Optic with extruded conic profile
AssigneeMicrosoft Corporation
InventorsLiying Chen, Timothy Large, Neil Emerton, Adrian Travis
Life of this patent
Estimating the term…
Abstract
A transmission optic having a transparent sheet with opposing front and back faces and an end face adjacent the front and back faces. The separation between the back face and a nearest point on the front face varies as a conic function of distance along the front face from that point to the end face.
Claims20
A transmission optic comprising:
- a transparent sheet with opposing front and back faces and an end face adjacent the front and back faces, a separation between the back face and a nearest point on the front face varying as a conic function of distance along the front face from that point to the end face, the conic function equal to a constant plus a term linear in the distance plus a square root of a quadratic polynomial of the distance,
- a shape of the transparent sheet being such that an incidence angle of light propagating through the sheet initially increases, relative to a surface normal of the sheet, and then decreases with each successive bounce.
A transmission optic comprising:
- a transparent sheet with opposing front and back faces and opposing first and second end faces each adjacent the front and back faces, a separation between the back face and a nearest point on the front face varying as a conic function of distance along the front face from that point to the first end face, the separation being greatest between the first and second end faces and tapering down on approaching both the first end face and the second end face, the conic function equal to a constant plus a term linear in the distance plus a square root of a quadratic polynomial of the distance.
A method for making a transmission optic comprising a transparent sheet with opposing front and back faces and opposing first and second end faces each adjacent the front and back faces, the method comprising:
- computing a desired separation between the back face and a nearest point on the front face as a conic function of distance along the front face from that point to the first end face, the separation being greatest between the first and second end faces and tapering down on approaching both the first end face and the second end face, the conic function equal to a constant plus a term linear in the distance plus a square root of a quadratic polynomial of the distance;
- machining at least one mold surface to define a void conforming to the conic function;
- and
- filling the void with a transparent plastic material.
1 more element
Dependencies are inferred from the claim text.