Patent ID: 6750439
Filing Date: 2004-06-15
Classification: G01V

Abstract:
A light curtain generating device, comprising a light emitting pillar assembly accommodating an array of light emitting units within a pillar case and a light receiving pillar assembly accommodating an array of light receiving units within a pillar case, the light emitting pillar assembly and light receiving pillar assembly being placed opposite to each other so as to form a light curtain for detecting an object between the pillar assemblies, characterized in that:the light emitting unit array and light receiving unit array accommodated in the respective pillar cases each comprise a group of single-beam optical modules, each single-beam optical module comprising a single light emitting unit or a single light receiving unit comprising a lens, an optical element and a holder integrally incorporated with the lens and optical element so as to align the lens and optical element with a prescribed optical axial line, and the holder being separated from holders of other single-beam optical modules, each pillar case accommodating a base frame defining mounting positions for a plurality of single-beam optical modules, and each single-beam optical module being mounted in the mounting position of the base frame.