Passive force feedback for computer interface devices
First Claim
1. An apparatus for interfacing the motion of an object with an electrical system, the apparatus comprising:
- a support mechanism providing a first revolute degree of freedom to said object about a first axis of rotation;
a sensor electrically coupled to said electrical system and mechanically coupled to said support mechanism for sensing positions of said object along said first degree of freedom, said sensor having a sensing resolution; and
a braking mechanism electrically coupled to said electrical system and mechanically coupled to said support mechanism to create a drag along said first degree of freedom, said braking mechanism providing an amount of play between said braking mechanism and said object along said degree of freedom, said amount of play being equal to or greater than said sensing resolution;
whereby said braking mechanism and said sensor provide an electromechanical interface between said object and said electrical system.
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Accused Products
Abstract
A method and apparatus for interfacing the motion of an object with a digital processing system includes a sensor which has a sensing resolution and detects movement of the object along a degree of freedom. An amount of play less than the sesning resolution exists between the sensor and the object. A passive actuator is coupled to the mechanism to transmit a resistive force to the object along the degree of freedom. A play mechanism is coupled to the actuator to provide a desired amount of play between the actuator and the object along the degree of freedom. The desired amount of play is greater than the sensing resolution of the sensor so that the sensor can detect the desired play when the user moves the object, even when the actuator has locked the object into place. Such desired play can be torsion flex (compliance) or rotary backlash. The actuator and the sensor provide an electromechanical interface between the object and the digital processing system. A gimbal mechanism or slotted yoke mechanism can be coupled between the actuator and the object. The interface is well suited for simulations of medical procedures and simulations in which an object such as a stylus or a joystick is moved and manipulated by the user.
349 Citations
26 Claims
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1. An apparatus for interfacing the motion of an object with an electrical system, the apparatus comprising:
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a support mechanism providing a first revolute degree of freedom to said object about a first axis of rotation;
a sensor electrically coupled to said electrical system and mechanically coupled to said support mechanism for sensing positions of said object along said first degree of freedom, said sensor having a sensing resolution; and
a braking mechanism electrically coupled to said electrical system and mechanically coupled to said support mechanism to create a drag along said first degree of freedom, said braking mechanism providing an amount of play between said braking mechanism and said object along said degree of freedom, said amount of play being equal to or greater than said sensing resolution;
whereby said braking mechanism and said sensor provide an electromechanical interface between said object and said electrical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for interfacing the motion of an object with a computer system, the apparatus comprising:
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a support mechanism providing a first degree of freedom to said object;
a sensor electrically coupled to said computer system and mechanically coupled to said support mechanism operative to sense positions of said object in said first degree of freedom, said sensor having a sensing resolution;
a drag mechanism electrically coupled to said computer system and rigidly mechanically coupled to said support mechanism to create a drag along said first degree of freedom, said drag mechanism providing an amount of play between said drag mechanism and said object in said degree of freedom, said amount of play being equal to or greater than said sensing resolution; and
an active actuator electrically coupled to said computer system and mechanically coupled to said support mechanism to create a force in said first degree of freedom based on electrical signals received by said active actuator. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An interface apparatus for interfacing the motion of an object with a computer system, the apparatus comprising:
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a sensor operative to sense positions of said object in a first degree of freedom, said positions provided to said computer system, said sensor having a sensing resolution;
a passive actuator operative to create a drag to said motion of said object in said first degree of freedom;
a play mechanism providing an amount of play between said passive actuator and said object in said degree of freedom, said amount of play being equal to or greater than said sensing resolution; and
an active actuator operative to create an active force on said object in said first degree of freedom based on electrical signals received by said active actuator. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification