Patent ID: 6700316
Filing Date: 2004-03-02
Classification: F21S

Abstract:
A projector type lamp comprising:a reflector having a first focal point and a second focal point; a light source arranged in a vicinity of the first focal point of the reflector; and a projection lens having an optical axis and arranged with its focal point located in a vicinity of the second focal point at which light emitted from the light source and reflected by the reflector converges, the projection lens being formed by combining a plurality of processed projection lens elements that are fabricated by processing a plurality of unprocessed projection lenses substantially identical in optical axis center and focal point yet different in outer diameter, the projection lens having a substantially rectangular shape in a plan view as viewed from the optical axis, boundaries between the plurality of processed projection lens elements in the plan view as viewed from the optical axis direction being composed of a line connecting points of intersection between a contour line of the projection lens in said plan view and a line defining a part of each unprocessed projection lens at which thickness of the unprocessed projection lens is substantially zero, such that lens surfaces of the processed projection lens elements are continuous with one another through stepped portions, the stepped portions each having a surface that is substantially parallel to the optical axis of the projection lens.