Light-responsive control device of electrochromic rearview mirror system
First Claim
1. A light-responsive control device of an electrochromic rearview mirror system of a vehicle, said electrochromic rearview mirror system including a first, a second and a third rearview mirror assemblies, said first rearview mirror assembly including a first rearview mirror and a first electrochromic unit for changing a reflection rate of said first rearview mirror in response to a first voltage applied thereto, said second rearview mirror assembly including a second rearview mirror and a second electrochromic unit for changing a reflection rate of said second rearview mirror in response to a second voltage applied thereto, said third rearview mirror assembly including a third rearview mirror and a third electrochromic unit for changing a reflection rate of said third rearview mirror in response to a first voltage applied thereto, and said light-responsive control device comprising:
- a first photo-sensor disposed on said vehicle and oriented downwards for generating a first signal in response to an intensity of the ambient light;
a second photo-sensor disposed at a back side of said first rearview mirror for generating a second signal in response to an intensity of a rear light reaching said first rearview mirror;
a third photo-sensor disposed at a back side of said second rearview mirror for generating a third signal in response to an intensity of a rear light reaching said second rearview mirror;
a fourth photo-sensor disposed at a back side of said third rearview mirror for generating a fourth signal in response to an intensity of a rear light reaching said third rearview mirror;
a discriminating circuit electrically connected to said first, second, third and fourth photo-sensors, generating a reference signal in response to said first signal, generating a first adjusting signal in response to a comparing result of said second signal and said reference signal, generating a second adjusting signal in response to a comparing result of said third signal and said reference signal, and generating a third adjusting signal in response to a comparing result of said fourth signal and said reference signal;
a first charge/discharge unit electrically connected to said discriminating circuit and said first electrochromic unit for providing a first variable drive voltage for said first electrochromic unit in response to said first adjusting signal;
a second charge/discharge unit electrically connected to said discriminating circuit and said second electrochromic unit for providing a second variable drive voltage for said second electrochromic unit in response to said second adjusting signal; and
a third charge/discharge unit electrically connected to said discriminating circuit and said third electrochromic unit for providing a third variable drive voltage for said third electrochromic unit in response to said third adjusting signal,wherein said discriminating circuit includes;
a first comparing unit electrically connected to said first photo-sensor for comparing said first signal with a third predetermined signal to determine which of a first and a second predetermined signals to serve as said reference signal;
a second comparing unit electrically connected to said second photo-sensor and said first comparing unit for comparing said second signal with said reference signal to generate said first adjusting signal;
a third comparing unit electrically connected to said third photo-sensor and said first comparing unit for comparing said third signal with said reference signal to generate said second adjusting signal; and
a fourth comparing unit electrically connected to said fourth photo-sensor and said first comparing unit for comparing said fourth signal with said reference signal to generate said third adjusting signal.
1 Assignment
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Accused Products
Abstract
A light-responsive control device of an electrochromic rearview mirror system is disclosed. The light-responsive control device includes a downward ambient light sensor and a, discriminating circuit for generating a first and a second reference levels provided for daytime and nighttime glaring determination, respectively. By providing a photo-sensor for each rearview mirror, and individually comparing the outputs of the photo-sensors with the first or the second reference level, the color-change degrees of different rearview mirrors can be individually controlled. By providing a variable resistor for the drive circuit, the initial reflection rate of the rearview mirror can be adjusted optionally.
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Citations
3 Claims
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1. A light-responsive control device of an electrochromic rearview mirror system of a vehicle, said electrochromic rearview mirror system including a first, a second and a third rearview mirror assemblies, said first rearview mirror assembly including a first rearview mirror and a first electrochromic unit for changing a reflection rate of said first rearview mirror in response to a first voltage applied thereto, said second rearview mirror assembly including a second rearview mirror and a second electrochromic unit for changing a reflection rate of said second rearview mirror in response to a second voltage applied thereto, said third rearview mirror assembly including a third rearview mirror and a third electrochromic unit for changing a reflection rate of said third rearview mirror in response to a first voltage applied thereto, and said light-responsive control device comprising:
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a first photo-sensor disposed on said vehicle and oriented downwards for generating a first signal in response to an intensity of the ambient light; a second photo-sensor disposed at a back side of said first rearview mirror for generating a second signal in response to an intensity of a rear light reaching said first rearview mirror; a third photo-sensor disposed at a back side of said second rearview mirror for generating a third signal in response to an intensity of a rear light reaching said second rearview mirror; a fourth photo-sensor disposed at a back side of said third rearview mirror for generating a fourth signal in response to an intensity of a rear light reaching said third rearview mirror; a discriminating circuit electrically connected to said first, second, third and fourth photo-sensors, generating a reference signal in response to said first signal, generating a first adjusting signal in response to a comparing result of said second signal and said reference signal, generating a second adjusting signal in response to a comparing result of said third signal and said reference signal, and generating a third adjusting signal in response to a comparing result of said fourth signal and said reference signal; a first charge/discharge unit electrically connected to said discriminating circuit and said first electrochromic unit for providing a first variable drive voltage for said first electrochromic unit in response to said first adjusting signal; a second charge/discharge unit electrically connected to said discriminating circuit and said second electrochromic unit for providing a second variable drive voltage for said second electrochromic unit in response to said second adjusting signal; and a third charge/discharge unit electrically connected to said discriminating circuit and said third electrochromic unit for providing a third variable drive voltage for said third electrochromic unit in response to said third adjusting signal, wherein said discriminating circuit includes; a first comparing unit electrically connected to said first photo-sensor for comparing said first signal with a third predetermined signal to determine which of a first and a second predetermined signals to serve as said reference signal; a second comparing unit electrically connected to said second photo-sensor and said first comparing unit for comparing said second signal with said reference signal to generate said first adjusting signal; a third comparing unit electrically connected to said third photo-sensor and said first comparing unit for comparing said third signal with said reference signal to generate said second adjusting signal; and a fourth comparing unit electrically connected to said fourth photo-sensor and said first comparing unit for comparing said fourth signal with said reference signal to generate said third adjusting signal. - View Dependent Claims (2, 3)
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Specification