Lens for a lamp and method of producing a die therefor

Details Lens for a lamp and method of producing a die therefor Lens for a lamp and method of producing a die therefor

1992-12-14

1995-03-14

Sugarman, Scott J.

Optical: systems and elements

Lens

With multipart element

425808, 359743, G02B 308

Patent

active

053981375

ABSTRACT:
A lens for a lamp having a non-planar portion in which a large number of Fresnel lens steps or prism steps are formed on the incident surface thereof, yet which produces a very parallel output beam. The lens steps are defined by a tangential vector at an arbitrary point of a refraction boundary surface (Fresnel lens steps) or a total-reflection surface (prism steps) which is in the same direction as an outer product of a normal vector of the refraction boundary surface or total-reflection surface and a normal vector of an exit surface of the lens at a refraction point where a ray refracted by the refraction boundary surface or total-reflection surface is refracted. A method is also disclosed for producing a die for forming such a lens.

REFERENCES:
patent: 4574338 (1986-03-01), Takasaki et al.
patent: 4927248 (1990-05-01), Sakakibara et al.
patent: 4969783 (1990-11-01), Ozawa et al.
patent: 4993807 (1991-02-01), Sakakibara

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