Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-01-18
1995-05-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
359839, H01J 4014
Patent
active
054163137
ABSTRACT:
A rearview mirror system for a vehicle having a reflective element with a reflective surface and a variable light transmission element includes an optical display device behind the reflective element in order to produce a visual display to the driver. A control is provided having a light sensor that senses light conditions in the vicinity of the vehicle and produces a continuously variable light signal indicative of such sensed light conditions. The control further includes a drive circuit that is responsive to the light signal in order to supply a drive signal to the reflective element and thereby establish the light transmission level of the light transmission element. The control further includes an intensity control circuit that varies the intensity of the optical display as a function of the value of the sensed light in the vicinity of the vehicle in order to accommodate physiological changes in the driver's eyes. The intensity control circuit further varies the intensity of the optical display device as a function of the drive signal supplied to the reflective element in order to compensate for reduced light transmission levels of the light transmission element. The intensity control circuit sums values of the light signal and the drive signal and processes the sum to a pulse-width modulated signal using a non-linear processor. The intensity control also provides a substantially constant high intensity of the optical display device for all values of sensed light above a predetermined high light level and for all values of sensed light below a predetermined low light level.
REFERENCES:
patent: 3506229 (1964-04-01), Schoot et al.
patent: 3612654 (1971-10-01), Klein
patent: 3612666 (1971-10-01), Rabinow
patent: 3680951 (1972-08-01), Jordan et al.
patent: 3722984 (1973-03-01), Brean
patent: 3862798 (1975-01-01), Hopkins
patent: 3986022 (1976-10-01), Hyatt
patent: 3992873 (1976-11-01), Awalt
patent: 4005928 (1977-02-01), Kmetz et al.
patent: 4097131 (1978-06-01), Nishiyama
patent: 4165157 (1979-08-01), Kobale et al.
patent: 4200361 (1980-04-01), Malvano et al.
patent: 4299444 (1981-11-01), Romer
patent: 4386345 (1983-05-01), Narveson et al.
patent: 4388558 (1983-06-01), Mizuno et al.
patent: 4418102 (1983-11-01), Ferrato
patent: 4443057 (1984-04-01), Bauer et al.
patent: 4491390 (1985-01-01), Tong-Shen
patent: 4521079 (1985-06-01), Leenhouts et al.
patent: 4529873 (1985-07-01), Ballmer et al.
patent: 4572619 (1986-02-01), Reininger et al.
patent: 4600273 (1986-07-01), Ohno
patent: 4603946 (1986-08-01), Kato et al.
patent: 4623222 (1986-11-01), Itoh et al.
patent: 4630904 (1986-12-01), Pastore
patent: 4632509 (1986-12-01), Ohmi et al.
patent: 4640583 (1987-02-01), Hoshikawa et al.
patent: 4655549 (1987-04-01), Suzuki et al.
patent: 4660937 (1987-04-01), Richardson
patent: 4669825 (1987-06-01), Itoh et al.
patent: 4669826 (1987-06-01), Itoh et al.
patent: 4669827 (1987-06-01), Fukada et al.
patent: 4671615 (1987-06-01), Fukada et al.
patent: 4676601 (1987-06-01), Itoh et al.
patent: 4690508 (1987-09-01), Jacob
patent: 4693558 (1987-09-01), Nakaho et al.
patent: 4696548 (1987-09-01), Ueno et al.
patent: 4701022 (1987-10-01), Jacob
patent: 4721364 (1988-01-01), Itoh et al.
patent: 4739226 (1988-04-01), Murata
patent: 4741603 (1988-05-01), Miyagi et al.
patent: 4793690 (1988-12-01), Gahan et al.
patent: 4799768 (1989-01-01), Gahan
patent: 4855727 (1989-08-01), Tsuchiya et al.
patent: 4882565 (1989-11-01), Gallmeyer
patent: 4886960 (1989-12-01), Molyneux et al.
patent: 4896030 (1990-01-01), Miyaji
patent: 4917477 (1990-04-01), Bechtel et al.
patent: 4940315 (1990-07-01), Demiryont
patent: 5037182 (1991-08-01), Groves et al.
patent: 5148014 (1992-09-01), Lynam et al.
patent: 5223814 (1993-06-01), Susman
patent: 5253109 (1993-10-01), O'Farrell et al.
European Search Report in Application No. EP 93 31 0144.
Patent Abstracts of Japan, vol. 10, No. 246 (M-510) (2302), 23 Aug. 1986, and JP-A-61 075 033 (Seiko Epson), 17 Apr. 1986 * abstract *.
Donnelly Electrochromic Mirrors brochure, published Feb. 15, 1990.
Gladstone et al., IBM Technical Disclosure Bulletin, vol. 15, No. 2, Jul., 1972.
Donnelly Compass Mirrors brochure, published Apr. 30, 1989.
Larson Mark L.
Lynam Niall R.
Schierbeek Kenneth L.
Donnelly Corporation
Nelms David C.
LandOfFree
Display for automatic rearview mirror does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Display for automatic rearview mirror, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display for automatic rearview mirror will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-639515