Electrically dimmable rear-view mirror for motor vehicles

  • US 4,572,619 A
  • Filed: 01/26/1984
  • Issued: 02/25/1986
  • Est. Priority Date: 01/27/1983
  • Status: Expired due to Fees
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First Claim
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1. An electrically dimmable rear-view mirror comprising:

  • a linear polarizing means with a transmission axis receiving incident light for generating a light output,a transmission layer means for receiving at least a portion of light output from the linear polarizing means to transmit a portion of the light received thereby and including a ceramic means exhibiting an electro-optical effect in response to an electric field for controlling the effective reflectivity of the rear-view mirror,a reflecting layer means including at least a multi-layer dielectric arrangement receiving light output from the transmission layer means,spaced electrode means disposed on at least one side of the transmission layer means for generating an electric field substantially parallel to the transmission layer means in response to a voltage applied to the electrode means to provide a linear birefringence in the transmission layer,a transmission window means in the reflecting layer means for transmitting a luminous flux from the transmission layer,a second polarizer for receiving said transmitted luminous flux, the transmission axis of the second polarizer coinciding with that of the linear polarizer,a light sensor means receiving the transmitted luminous flux from the second polarizer for generating a voltage output signal which increases monotonically with the intensity of the transmitted luminous flux from the second polarizer,a control voltage source responsive to the voltage output signal to produce a voltage which, in its turn, increases monotonically with the output voltage from the light sensor means for generating the electric field which effects the linear birefringence of the transmission layer.

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