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US 6,554,490 B1Granted
Electronic apparatus having communication function using detachable communication cable, capable of reducing power consumption and stable operation
AssigneeSharp Kabushiki Kaisha
InventorsKazuyuki Sumi, Hirohisa Wakai, Takashi Nishimura, Yuji Ichikawa, Masafumi Takahashi, Daisuke Nakano, Toru Ueda, Kazuhito Nagura
Life of this patent
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Abstract
An electronic apparatus comprising a detecting unit, a communications unit, and a power control circuit. The power control circuit supplies power to a communication circuit unit based upon a result of detection of the detecting unit.
Claims18
An electronic apparatus to which a communication cable is attachable and detachable, comprising:
- a main circuit of said electronic apparatus;
- a first detecting unit detecting a state of connection of said communication cable;
- a first communication unit communicating a signal with said communication cable;
- a second communication unit communicating said signal between said first communication unit and said main circuit;
- and
- a first power control unit controlling power supply to said first and second communication unit, based on a result of detection by said first detecting unit.
3 more elements
An electronic apparatus to which a communication cable is detachable and attachable, comprising:
- a receptacle receiving a plug of said communication cable inserted thereto;
- a detecting unit detecting a state of insertion between said plug and said receptacle;
- a communication unit communicating a signal to and from said communication cable;
- and
- a switch unit provided for communicating said signal between said receptacle and said communication unit, and turning on and off based on the result of detection by said detecting unit.
2 more elements
An electronic apparatus to which a communication cable is attachable and detachable, comprising:
- a first detecting unit detecting a state of connection of said communication cable;
- a communication unit communicating a signal with said communication cable;
- and
- a first power control unit controlling power supply to said communication unit, based on a result of detection by said first detecting unit, wherein said first power control unit includes a clock generating circuit supplying or stopping operation clock to said communication unit, dependent on said state of connection.
1 more element
An electronic apparatus to which a communication cable is attachable and detachable, comprising:
- a first detecting unit detecting a state of connection of said communication cable;
- a communication unit communicating a signal with said communication cable;
- and
- a first power control unit controlling power supply to said communication unit, based on a result of detection by said first detecting unit, wherein
- at least an optical fiber is used as said communication cable;
- said electronic apparatus further comprising
- an optical front-end circuit communicating an optical signal between said optical fiber and said communication unit, and
- a second power control unit controlling power supply to said optical front-end circuit based on the result of detection by said first detecting unit;
- wherein said first power control unit includes a clock generating circuit supplying or stopping operation clock to said communication unit dependent on said state of connection.
6 more elements
An electronic apparatus to which a communication cable is detachable and attachable, comprising:
- a first detecting unit detecting a state of connection of said communication cable;
- a communication unit communicating a signal with said communication cable;
- and
- a first power control unit controlling power supply to said communication unit, based on a result of detection by said first detecting unit, wherein
- at least an optical fiber is used as said communication cable;
- said electronic apparatus further comprising
- a plurality of communication ports each capable of communicating a signal through said communication cable, and
- a plurality of front-end circuits provided corresponding to said plurality of communication ports respectively, for transmitting/receiving an optical signal between said optical fiber and said communication unit;
- wherein
- said first detecting unit is arranged for each communication port;
- said electronic apparatus further comprising a plurality of second power control units provided corresponding to said plurality of optical front-end circuits respectively, controlling power supply to corresponding one of said optical front-end circuits based on the result of detection by corresponding said first detecting unit.
8 more elements
An electronic apparatus to which a communication cable is detachable and attachable, comprising:
- a receptacle receiving a plug of said communication cable inserted thereto;
- a detecting unit detecting state of insertion between said plug and said receptacle;
- a communication unit communicating a signal to and from said communication cable;
- a switch unit provided between said receptacle and said communication unit, and operating based on the result of detection by said detecting unit;
- and
- a standby unit activating a control signal after a prescribed time from a timing at which said insertion is detected;
- wherein said switch unit disconnects or connects said receptacle and said communication unit, in accordance with said control signal.
4 more elements
Dependencies are inferred from the claim text.