Apparatus and method for estimating optical-based force
Provided i an apparatus configured to estimate an optical-based force, the apparatus including a main body, a cover disposed at a first side of the main body and configured to contact an object, a support part connected to two sides of the cover, supporting the cover, and protruding toward an inside of the main body, and an optical sensor disposed on the support part, the optical sensor including a light source configured to emit light onto a reflector, a detector configured to detect light reflected from the reflector, and a circuit unit configured to estimate a contact force of the object based on the detected light.
1. An apparatus configured to estimate an optical-based force, the apparatus comprising:
a main body;
a cover disposed at a first side of the main body and configured to contact an object;
a support part connected to two sides of the cover, supporting the cover, and protruding toward an inside of the main body; and
an optical sensor contacting an outer surface of the support part, the optical sensor comprising a light source configured to emit light onto a reflector contacting an outer surface of the cover, a detector configured to detect light reflected from the reflector, and a circuit unit configured to estimate a contact force of the object based on the detected light.
2. The apparatus of claim 1 , wherein in the optical sensor, the circuit unit is further configured to:
obtain a degree of deformation of the support part, which is deformed by a pressing force of the object on the cover, based on an intensity of an optical signal; and
estimate the contact force of the object based on the obtained degree of deformation.
3. The apparatus of claim 1 , wherein at least one or more optical sensors are disposed at a first side or a second side of the support part.
4. The apparatus of claim 3 , wherein based on the optical sensor being disposed at the first side of the support part, the reflector is disposed on a main board facing the optical sensor, and based on the optical sensor being disposed at the second side of the support part, the reflector is disposed on the cover facing the optical sensor.
5. The apparatus of claim 1 , wherein the reflector is integrally formed with the main body.
6. The apparatus of claim 1 , wherein in the optical sensor, each of an exit angle of light emitted by the light source onto the reflector and an incident angle of light reflected from the reflector to the detector is in a range of from 90 degrees to 180 degrees.
7. The apparatus of claim 1 , wherein in the optical sensor, a distance between a center of the light source and a center of the detector is in at least one of a range of from 50 μm to 125 μm or a range of from 700 μm to 2000 μm.
8. The apparatus of claim 1 , wherein in the optical sensor, the light source, and the detector are disposed on a same plane.
9. The apparatus of claim 8 , wherein in the optical sensor, a vertical distance between the light source and the detector, which are disposed on the same plane, and the reflector is in a range of from 10 μm to 1000 μm.
10. The apparatus of claim 1 , wherein the cover is made of a glass material, and the support part is made of a plastic material.
11. A method of estimating an optical-based force based on an apparatus comprising an optical sensor, a support part, a cover, and a main body, the method comprising:
measuring an optical signal based on the apparatus contacting an object, by using the optical sensor contacting an outer surface of the support part connected to two sides the cover, supporting the cover, and protruding toward an inside of the main body, the cover being disposed at a first side of the main body and configured to contact the object; and
estimating a contact force of the object based on the measured optical signal by using the optical sensor,
wherein the optical sensor comprises a light source configured to emit light onto a reflector contacting an outer surface of the cover and a detector configured to detect light reflected from the reflector.
12. The method of claim 11 , wherein the measuring of the optical signal comprises measuring the optical signal by emitting light onto a reflector and detecting light reflected from the object.
13. The method of claim 11 , wherein the estimating of the contact force of the object based on the optical signal comprises:
obtaining a degree of deformation of the support part, which is deformed by a pressing force of the object on the cover, based on an intensity of the optical sensor; and
estimating the contact force of the object based on the obtained degree of deformation.
14. A wearable apparatus comprising:
a first main body;
a strap;
an apparatus configured to estimate an optical-based force, the apparatus comprising:
a second main body;
a cover disposed at a first side of the second main body and configured to contact an object;
a support part connected to two sides of the cover, supporting the cover, and protruding toward an inside of the main body; and
an optical sensor contacting an outer surface of the support part, the optical sensor comprising a light source configured to emit light onto a reflector contacting an outer surface of the cover, a detector configured to detect light reflected from the reflector, and a circuit unit configured to estimate a contact force of the object based on the detected light.