Vehicle-loaded display device

  • US 4,638,287 A
  • Filed: 01/10/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 03/01/1983
  • Status: Expired due to Fees
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First Claim
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1. A vehicle-loaded display device mounted on a vehicle having a steering wheel, said device comprising:

  • transmission line means, including an electric conductor;

    a control board disposed at a central portion of said steering wheel;

    a supporting mechanism for supporting said control board in a stationary condition irrespective of turning of said steering wheel;

    at least one two-dimensional display means incorporated in said control board;

    electric filter means, incorporated in said control board, for transmitting a first electric signal having a frequency, within a desired frequency range, through said transmitting means;

    a first demodulation means incorporated in said control board for demodulating the first electric signal, received from said electric filter means, into display information and then applying the display information to said two-dimensional display means;

    a plurality of command switches incorporated in said control board;

    a first modulation means incorporated in said control board for FSK modulating a predetermined input code signal and for outputting a second electric signal through said transmission line means;

    a first electronic control device incorporated in said control board to be connected with said command switches and said first modulation means for generating said code signal in accordance with operation of said command switches and then applying the code signal to said first modulation means;

    a second modulation means disposed on a vehicle body in a position mechanically separated from said steering wheel for modulating an information signal into the first electric signal having a frequency different from and an amplitude much less than that of said second electric signal output by said first modulation means and then applying the first electric signal to said first demodulation means;

    a display information generating means for generating said display information and then applying the display information to said second modulation means;

    a second demodulation means, including a Schmitt trigger, disposed on the vehicle body in a position mechanically separated from said steering wheel, for demodulating said second electric signal into said code signal;

    a second electronic control device disposed on the vehicle body in a position mechanically separated from said steering wheel and electrically connected to said second demodulation means for instructing said display information generating means to generate the display information in accordance with said code signal; and

    an electric interconnection means, disposed beneath said steering wheel, said electric interconnection means comprising direct current blocking means for electrically connecting said first demodulation means and said first modulation means to said second modulation means and said second demodulation means, respectively, alternating current blocking means for electrically connecting a power supply line of said control board to a vehicle-loaded power supply, and said transmission line means,whereby said first and second electric signals having different amplitudes and frequencies, and said code signal which is FSK modulated, all may be transmitted over said transmission line means.

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