05691898 is referenced by 520 patents and cites 136 patents.

A method and apparatus for providing safe and low-cost force feedback peripherals for consumer applications. A device microprocessor local to an interface device is coupled to the host by a first interface bus. The microprocessor receives host commands from the host computer on the first interface bus, such as an RS-232 interface, and commands an actuator to apply a force to a user object, such as a joystick, in response to host commands. A sensor detects positions of the user object and outputs signals to the host on a second interface bus, such as a PC game port bus, separate from the first bus. In a "recoil" embodiment, a user initiates force feedback by pressing a button on the joystick, which sends an activation signal to the actuator. In other recoil embodiments, the host computer can transmit one or more enable signals and/or activation signals to the actuator to enable or command forces. A safety switch of the present invention disables the actuator when the interface device is not in use and enables the actuator when an amount of weight over a predetermined amount is placed on the joystick created by a user grasping the joystick. A circuit of the present invention includes a capacitor for storing power provided by an input signal and supplied to the actuator when forces are to be output.

Title
Safe and low cost computer peripherals with force feedback for consumer applications
Application Number
566282
Publication Number
5691898
Application Date
March 28, 1996
Publication Date
November 25, 1997
Inventor
Bruce M Schena
Menlo Park
CA, US
Adam C Braun
Sunnyvale
CA, US
Louis B Rosenberg
Pleasanton
CA, US
Agent
Hickman Beyer & Weaver
Assignee
Immersion Human Interface
CA, US
IPC
G06F 19/00
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