Actuator with sensor

1. A medical and welfare robot to come into contact with a human through a surgical device, the medical and welfare robot comprising:

an actuator with a sensor, wherein the actuator with a sensor includes:

a rigid body member,

a sensor provided in contact with the rigid body member, wherein the sensor is a tactile sensor that includes a sensor membrane configured to come into soft contact with an object, and

an actuator connected to the sensor through the rigid body member, wherein the actuator includes electrodes and an ionic conduction layer,

wherein, in response to deformation of the actuator, the rigid body member prevents the sensor from being deformed.

2. The medical and welfare robot according to claim 1 , wherein the actuator is connected directly to the rigid body member provided in contact with the sensor such that the actuator along a major axis direction of the actuator and the sensor face one another through the rigid body member.

3. The medical and welfare robot according to claim 1 , wherein the actuator and the rigid body member provided in contact with the sensor are provided on a frame such that the actuator along a major axis direction of the actuator and the sensor do not face one another.

4. The medical and welfare robot according to claim 1 , wherein the rigid body member is configured as an insulating structure as a whole to electrically isolate the sensor from the actuator.

5. The medical and welfare robot according to claim 1 , wherein the sensor membrane is made of a material and the rigid body member has a dielectric constant value that is smaller than a dielectric constant value of the material of the sensor membrane.

6. The medical and welfare robot according to claim 1 , wherein the rigid body member includes an integrally formed low-thermal conductivity layer having a conductivity λ of λ≦5 W/(m·K), whereby, in response to a temperature of the actuator being raised by generating a force, the low-thermal conductivity layer lessens the noise or drift influence of the temperature on the sensor.

7. The medical and welfare robot according to claim 1 , wherein the actuator and the sensor are arranged in no contact with each other.

8. The medical and welfare robot according to claim 1 , wherein the actuator and the sensor are respectively arranged on opposing two surfaces of the rigid body member.

9. The medical and welfare robot according to claim 1 , wherein the actuator and the sensor are respectively arranged at different positions on a surface of the rigid body member.

10. The medical and welfare robot according to claim 1 , wherein the sensor does not shape change by bending, on a dimension orthogonal to a major axis direction of the actuator, together with the actuator when the actuator is shape change by bending as a whole.

11. The medical and welfare robot according to claim 1 , wherein, in response to the actuator exhibiting bending motion as to become flexed toward one of the electrodes, the sensor does not exhibit bending motion as to become flexed toward one of the electrodes together with the actuator.

12. The medical and welfare robot according to claim 1 , wherein, in response to a shape change of the actuator itself, a sensor forming surface of the sensor provided in contact with the rigid body member is not distorted by the shape change of the actuator itself such that influence of a strain attending on a shape change action of the actuator is not superimposed in a resistance value detected by the sensor of a strain by contact with an object.

13. The medical and welfare robot according to claim 1 , wherein the rigid body member is formed of a rigid material that is configured to cause no strain against force generated by the actuator, wherein no strain is determined to exist when an error of the sensor output due to a strain attending on a shape change action of the actuator is less than ±20%.