Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1989-01-19
1990-05-22
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362308, 362299, 362328, 362335, B60Q 100
Patent
active
049282131
ABSTRACT:
The projector-type head lamp for use on vehicles according to the present invention comprises a reflector formed by a concave mirror having two foci, light source disposed near the first focus of the reflector, and convergent lens disposed opposite to the reflector with the second focus of the reflector located at the intermediate position between the lens and reflector. The convergent lens has an optical axis which is also the optical axis of the reflector and a focus located near the second focus of the reflector. There is provided near the focus of the convergent lens a shade which has a cut-off edge nearly in contact with the optical axis to produce a shaped beam. The convergent lens is composed of a frontal surface defined by an aspherical plane and a back surface defined by a flat plane which is so inclined in relation to the optical axis as to be nearer to the focus of the convergent lens as it goes from the upper portion toward the lower portion. Thereby, the color fringes caused by the chromatic aberration of the convergent lens appear within the main illuminated zone below the light-dark limit so that the existence of the color fringes is not conspicuous.
REFERENCES:
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patent: 4562519 (1985-12-01), Deves
patent: 4771372 (1988-09-01), Litetar et al.
patent: 4772987 (1988-09-01), Kretschmer et al.
patent: 4797790 (1989-01-01), Brodling et al.
patent: 4814950 (1989-03-01), Nakata
Cox D. M.
Ichikoh Industries Ltd.
Lazarus Ira S.
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