Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1993-08-11
1995-06-06
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362308, 362328, 362331, 362268, B60Q 100
Patent
active
054227933
ABSTRACT:
A projection-type headlight in which changes in the focal length of the projection lens cause color fringes arising due to chromatic aberration to be less noticeable in the luminous intensity distribution pattern, while a good horizontal spread is obtained in the luminous intensity distribution pattern. The projection lens is designed so that its focus lies at the front end of the top edge of a shield plate in a region within a predetermined distance from the optical axis as seen from the front, whereas the back focal length increases with decreasing distance to the margin of the lens in a region outside the first region. The projection lens is also designed in such a way that the amount of change in the back focal length of a sectional lens portion in region as cut through a vertical plane including the optical axis is smaller than the amount of change in the back focal length of a sectional lens portion in region as cut through a horizontal plane including the optical axis.
REFERENCES:
patent: 3578966 (1971-05-01), Levin
patent: 3708221 (1973-01-01), Schaefer
patent: 4100594 (1978-07-01), Gould
patent: 4517630 (1985-05-01), Dieffenbach et al.
patent: 4562519 (1985-12-01), Deves
patent: 4771372 (1988-09-01), Litetar et al.
patent: 5021930 (1991-06-01), Yamada
patent: 5036438 (1991-07-01), Nakata
Koito Manufacturing Co. Ltd.
Lazarus Ira S.
Sember Thomas M.
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