Patent Number: 6,295,124

Title: Rangefinder apparatus

Abstract: In the rangefinder apparatus in accordance with the present invention, an infrared emitting diode (IRED) having four light-emitting areas projects a first correction beam when only a first light-emitting area emits light, a reference beam when the first and second light-emitting areas emit light, and a second correction beam when all of the first to fourth light-emitting areas emit light. These three kinds of beams have emission light intensity distributions different from each other and an identical emission center-of-gravity position with respect to the base-length direction. The three kinds of beams are successively projected to an object at a distance to be measured, to yield respective distance information items, according to which a beam eclipse correction is carried out.

Inventors: Yoshida; Hideo (Saitama, JP)

Assignee: Fuji Photo Optical Co., Ltd.

International Classification: G01C 3/08 (20060101); G02B 7/32 (20060101); G01C 003/00 (); G02B 007/04 (); G03B 013/00 ()

Expiration Date: 09/25/2018