Detector device and mobile robot having the same

1. A detector device adapted to be disposed on a mobile robot for detecting a distance between the mobile robot and a surface, said detector device comprising:

a detector module including an optical emitter and a photon detector spaced apart from said optical emitter; and

a lens module including a lens body disposed adjacent to said detector module, said lens body including:

a first light-transmissive surface disposed adjacent to said detector module, said first light-transmissive surface having a first end and a second end opposite to said first end;

a second light-transmissive surface extending inclinedly from said first end of said first light-transmissive surface toward said second end of said first light-transmissive surface and away from said detector module; and

a third light-transmissive surface extending inclinedly from said second end of said first light-transmissive surface toward said first end of said first light-transmissive surface and away from said detector module;

wherein, said optical emitter is operable to emit a light beam passing through said first light-transmissive surface and said second light-transmissive surface toward the surface so as to define a field of emission on the surface, said photon detector being aligned with said first and third light-transmissive surfaces so as to define a field of view on the surface, an extent of overlap between the field of view and the field of emission varying in accordance with a distance between said optical emitter and the surface; and

wherein said detector module further includes a detector housing for receiving said optical emitter and said photon detector, said lens module further including a pair of side arms respectively connected to said first and second ends of said first light-transmissive surface, said detector housing having pair of first sides opposite to each other, said side arms respectively abutting against said first sides of said detector housing, one of said side arms being formed with an engaging component for engaging one side of said detector housing opposite to said second and third light-transmissive surfaces of said lens module.

2. The detector device as claimed in claim 1 , wherein each of said second and third light-transmissive surfaces is an inclined planar surface and has a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

3. The detector device as claimed in claim 1 , Wherein each of said second and third light-transmissive surfaces is a curved surface and has a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

4. The detector device as claimed in claim 1 , wherein one of said second and third light-transmissive surfaces is a curved surface and the other one of said second and third light-transmissive surfaces is an inclined planar surface, each of said second and third light-transmissive surfaces having a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

5. The detector device as claimed in claim 1 , wherein said detector housing further has a pair of second sides between said first sides thereof, said second sides being indented to form a pair of grooves, said lens module further including a pair of protrusions that extend from said first light-transmissive surface and that are spaced apart from each other, said protrusions of said lens module engaging said grooves of said detector housing.

6. A mobile robot comprising:

a robot casing having an opening;

a circuit board disposed in said robot casing; and

a detector device disposed in said robot casing and aligned with said opening, said detector device including:

a detector module including an optical emitter and a photon detector spaced apart from said optical emitter, said optical emitter and said photon detector being electrically coupled to said circuit board; and

a lens module including a lens body disposed adjacent to said detector module, said lens body including:

a first light-transmissive surface disposed adjacent to said detector module, said first light-transmissive surface having a first end and a second end opposite to said first end;

a second light-transmissive surface extending inclinedly from said first end of said first light-transmissive surface toward said second end of said first light-transmissive surface and away from said detector module; and

a third light-transmissive surface extending inclinedly from said second end of said first light-transmissive surface toward said first end of said first light-transmissive surface and away from said detector module;

wherein, said optical emitter is operable to emit a light beam passing through said first light-transmissive surface and said second light-transmissive surface toward a surface so as to define a field of emission on the surface, said photon detector being aligned with said first and third light-transmissive surfaces so as to define a field of view on the surface, an extent of overlap between the field of view and the field of emission varying in accordance with a distance between said optical emitter and the surface; and

wherein said detector module further includes a detector housing for receiving said optical emitter said photon detector said lens module further including a pair of side arms respectively connected to said first and second ends of said first light-transmissive surface, said detector housing having a pair of first sides opposite to each other, said side arms respectively abutting against said first sides of said detector housing one of said side arms being formed with an engaging component for engaging one side of said detector housing opposite to said second and third light-transmissive surfaces of said lens module.

7. The mobile robot as claimed in claim 6 , wherein each of said second and third light-transmissive surfaces is an inclined planar surface and has a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

8. The mobile robot as claimed in claim 6 , wherein each of said second and third light-transmissive surfaces is a curved surface and has a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

9. The mobile robot as claimed in claim 6 , wherein one of said second and third light-transmissive surfaces is a curved surface and the other one of said second and third light-transmissive surfaces is an inclined planar surface, each of said second and third light-transmissive surfaces having a tip end opposite to said first light-transmissive surface, said tip ends of said second and third light-transmissive surfaces being connected to each other.

10. The mobile robot as claimed in claim 6 , wherein said detector housing further has a pair of second sides between said first sides thereof, said second sides being indented to form a pair of grooves, said lens module further including a pair of protrusions that extend from said first light-transmissive surface and that are spaced apart from each other, said protrusions of said lens module engaging said grooves of said detector housing.