Title: Annular laser point projecting machine
Application Number: 95106882 Application Date: 1995.06.22
Publication Number: 1122010 Publication Date: 1996.05.08
Approval Pub. Date: 2001.07.18 Granted Pub. Date: 2001.07.18
International Classifi-cation: G02B27/09;G02B27/18;G02B27/42;G02B27/58;G03B21/00
Applicant(s) Name: Kabushiki Kaisha Topcon Address:
Inventor(s) Name: Ayao Otomo;Hiroo Sugai;Yohei Ogawa
Attorney & Agent: SHEN ZHAOKUN
Abstract:
    The present invention relates to a projector using laser light, and more particularly to a ring-shaped laser spot capable of forming a projected image having a ring-shaped projected image formed from a diffraction fringe, by interposing a diaphragm between a collimator lens and a target. The collimator lens transmits laser light emitted from a laser light source to the target to form a first projected image on the target. The diaphragm shapes the laser light transmitted through the collimator lens to form a ring-shaped second projected image as a diffraction fringe on the target.
Time: 7
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