Patent ID: 7193731

Claim:
A triangulation-type optical displacement sensor having at least one light-emitting element for projecting light onto at least one target to which one or more distances being measured, and at least one light-receiving element for receiving at least a portion of the light reflected from at least one of the distance measurement targets and being disposed such that at least one light-receiving surface thereof is substantially perpendicular to at least one optical axis of at least a portion of the projected light, comprising: at least one slit for narrowing at least one light beam projected toward at least one of the distance measurement targets, and said at least one slit for narrowing at least a portion of the light reflected from said at least one of the distance measurement targets, wherein said at least one slit for narrowing at least one light beam projected toward said at least one of the distance measurement targets is independent from said at least one slit for narrowing at least a portion of the light reflected from said at least one of the distance measurement targets.