The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 1999
Filed:
Sep. 04, 1996
Naohi Nino, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
In the formation of a basic surface of a reflection surface of a reflection mirror for a vehicle lamp, when a reference curve is established on a horizontal surface containing the optical axis or on an inclined surface inclined with respect to the horizontal surface, a light source, the central axis of which extends along the optical axis, is arranged close to the reference point of the reference curve. Then the reference curve is composed when a hyperbolic portion having a focus on the optical axis and an elliptical portion also having a focus on the optical axis are repeatedly arranged in a direction separate from the optical axis, and an angle of the reflecting light, which has been emitted from the light source, with respect to the optical axis at a point on each curve portion of the reference curve, is determined in such a manner that the closer to the optical axis the curve portion is, the larger the angle is increased. An imaginary paraboloid of revolution is assumed, the axis of which is parallel with the light vector of the reflecting light that has been sent from the reference point on the reference curve and reflected at an arbitrary point on the reference curve, and the imaginary paraboloid of revolution passes through the reflecting point, and its focus is located at the reference point.