| 摘要 |
PURPOSE:To eliminate use of headlight proprietary for each beam by locating No.1 focal point of a lower reflex mirror an appropriate amount backwards more than No.1 focal point of upper reflex mirror. CONSTITUTION:When a low beam filament 42 is lighted, even an upper reflex mirror 31 receives light and reflects it, wherein the angle of incidence beta from the filament 42, i.e., No.1 focal point F21 of a lower reflex mirror 32, shall be smaller than the angle of incidence alpha to each point on the reflex mirror 31 from No.1 focal point F11 of the mirror 31, as shown by broken line MB in the attached illustration. Therein the reflected beam of light passes over No.2 focal point F12, and there is no likelihood than an upward directed beam of light is emitted even from the upper reflex mirror 31, and this is accomplished by locating the mentioned No.1 focal point F21 of lower reflex mirror 32 either identical to or behind a line segment L formed by tying the effective front end part P of the upper reflex mirror 31 to the No.1 focal point F11 of the same. This eliminates use of headlight proprietary for each beam. |
