| 摘要 |
PROBLEM TO BE SOLVED: To provide a projector type lamp of excellent lighting characteristic, which is required as a head lamp for distribution of luminous intensity in driving and throws bright light over a distance while controlling brightness in this side. SOLUTION: A projection lens 4 of a projector type lamp is formed in almost a rectangle as a whole observing from the optical axis Z direction, by combining the optical axis center Z and a portion of a plurality of projection lend that has the same focal length and focal position and a different external size. When observing from the optical axis Z, a boundary between these plurality of projection lens is formed with a straight line linking the intersecting points which is made between a visible outline of each projection lens and a line for the thickness of each projection lens to be zero, and in the cross section in the length direction of the projection lens 4, a lens face of each projection lens is connected to the optical axis with an almost horizontal step. |
