| 摘要 |
PCT No. PCT/SE96/00439 Sec. 371 Date Sep. 9, 1997 Sec. 102(e) Date Sep. 9, 1997 PCT Filed Apr. 3, 1996 PCT Pub. No. WO96/31365 PCT Pub. Date Oct. 10, 1996An optical rear view mirror unit for motor vehicles comprises a plurality of converging optic elements and at least one intermediate optic element. The said each converging optic element is either a converging lens or a concave mirror comprisisng at least one single optic component, and the said intermediate optic element is either a said converging optic element or a simple reflector, by which a first converging optic element is an imaging optic element, located outside a vehicle, to form a first inverted image which is in or in the vicinity of an intermediate optic element, effecting the said intermediate optic element to direct the rays, from the first imaging optic element towards a second imaging optic element. The said second imaging optic element is located inside a vehicle, to form a second upright image which is in or in the vicinity of the last converging optic element in the said mirror unit, effecting the said last converging optic element further converge and redirect the rays from the said second imaging optic element towards the eyes of an observer. The optical axis after passing through the first imaging optic element is traveling forwardly and inwardly of a vehicle, at an acute angle to the longitudinal axis of a vehicle; and the said optical axis, after reflected by a reflecting interface of the said intermediate optic element, is traveling backwardly and inwardly, also at an acute angle to the longitudinal axis of a vehicle. The sum of the said two angles is less than 90 degrees. At least one refrecting prism may be added either before or after the said first or the second imaging optic element if needed, to further deflect the light to the desired pathway.
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