Signal transmission device
First Claim
1. A signal transmission device for controlling and providing power to a load, said device comprising an active module and a passive module, one of said modules having means for generating a repetitive electrical signal and one of said modules having means for frequency modulating the repetitive signal to provide modulated signals,said active module including means for transmitting modulated electromagnetic signals based upon the modulated signals, the modulated electromagnetic signals including light signals, and means for receiving modulated electromagnetic signals, including light signals;
- a passive module physically remote from and in electromagnetic transmissive communication with said active module, said passive module having electronic circuitry including means for transmitting modulated electromagnetic signals, based upon the modulated signals, to said active module, means for receiving the modulated electromagnetic signals transmitted from said active module, and means for deriving power from the modulated electromagnetic signals received from said active module for supplying power to said electronic circuitry and an electrical load connected to said passive module.
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Accused Products
Abstract
A device adapted to transmit a signal and a power with an electromagnetic wave or light being as the transmission medium. This device comprises active and passive modules each provided with means for effecting transmission and reception of at least one of the electromagnetic wave or light, and a signal processing circuit. Each module may further comprise an output or frequency control circuit. One of these modules is provided at a moving body such as a rotary body, and the other is provided at a fixed body to effect both signal transmission and power transmission between the moving and fixed sides.
74 Citations
19 Claims
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1. A signal transmission device for controlling and providing power to a load, said device comprising an active module and a passive module, one of said modules having means for generating a repetitive electrical signal and one of said modules having means for frequency modulating the repetitive signal to provide modulated signals,
said active module including means for transmitting modulated electromagnetic signals based upon the modulated signals, the modulated electromagnetic signals including light signals, and means for receiving modulated electromagnetic signals, including light signals; a passive module physically remote from and in electromagnetic transmissive communication with said active module, said passive module having electronic circuitry including means for transmitting modulated electromagnetic signals, based upon the modulated signals, to said active module, means for receiving the modulated electromagnetic signals transmitted from said active module, and means for deriving power from the modulated electromagnetic signals received from said active module for supplying power to said electronic circuitry and an electrical load connected to said passive module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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9. A signal transmission device as set forth in claim -, wherein said active and passive modules include means responsive to a change in transmission parameters depending on the distance between said passive and active modules or an environmental condition for generating a signal representative of the change and transmitting the generated signal to the other of said modules, said other module including means for automatically controlling the transmission frequency in response to the signal representative of the change to place the transmission in an optimum condition.
Specification