| CPC G02B 19/0085 (2013.01) [G01S 7/4813 (2013.01); G01S 17/10 (2013.01); G02B 19/0009 (2013.01); G02B 27/30 (2013.01)] | 18 Claims |
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1. An optical device, comprising:
a range finding module comprising:
a first light condenser unit defining an optical axis and a hole disposed along the optical axis;
a light emitting unit; and
a light receiving unit;
wherein the first light condenser unit, the light emitting unit and the light receiving unit are sequentially arranged along the optical axis;
wherein light is emitted by the light emitting unit, passes through the hole, reaches an object, is reflected by the object, is converged by the first light condenser unit and is received by the light receiving unit to generate an electrical signal;
wherein the optical device satisfies at least one of following condition:
0.05<d1/d2<0.3,
0.05<D1/D2<0.3,
where d1 is a diameter of the hole, d2 is a diameter of the first light condenser unit, D1 is a distance between the light emitting unit and the first light condenser unit, and D2 is a distance between a light emitting surface of the first light condenser unit and that of the second light condenser unit.
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