Distance measuring apparatus

Details Distance measuring apparatus Distance measuring apparatus

1998-11-09

2000-10-31

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

180169, 356 501, 356 51, G01C 308

Patent

active

061410853

ABSTRACT:
A light transmitting lens includes in a portion thereof a diffusion element constituted by a number of small prisms. The small prisms have the same height and different pitches depending on distances from an optical axis. Accordingly, the small prisms have different apical angles depending on the distances from the optical axis. The light transmitting lens has a function for collimating lights incident on the small prisms with the same apical angle. Light beams passed through the region of the diffusion element of the light transmitting lens are deflected at predetermined angles depending on the positions, however, the light beams passed through the other region of the light transmitting lens are collimated without deflection.

REFERENCES:
patent: 3892483 (1975-07-01), Saufferer
patent: 4681431 (1987-07-01), Sims et al.
patent: 5313262 (1994-05-01), Leonard
patent: 5455669 (1995-10-01), Wetteborn
patent: 5541724 (1996-07-01), Hoashi
patent: 5589930 (1996-12-01), Kurahashi et al.
patent: 5831717 (1998-11-01), Ikebuchi
patent: 5877849 (1999-03-01), Ramer et al.

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