Title:
トンネル照明の自動調光装置
Document Type and Number:
Japanese Patent JP4238392
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an automatic dimmer for tunnel illumination, capable of properly dimming and controlling illumination inside a tunnel, even if automatic illumination control matching illuminance and brightness outside the tunnel is disabled. SOLUTION: A compensating circuit includes a failure detection circuit 8 for determining whether or not a detection signal from a light receiver circuit 3 is normal, a timer circuit 10 for counting time and for outputting time signals, a detection signal database control circuit 9 for storing either the detection signal at a predetermined time according to the time signal transmitted from the timer circuit or corresponding data as detected signal data and for managing the previous detection signal data stored, and a switch circuit, which when the detection signal is determined to be normal by the failure detection circuit, outputs the detection signal to a control circuit and, which, when the detection signal is determined to be not normal, outputs in place of the detection signal a compensation signal, based on the detection signal data within the previous predetermined period at the corresponding time stored in the detection signal database.
Inventors:
Yasuyuki Aida
Hiroshi Takeuchi
Hiroshi Takeuchi
Application Number:
JP27914398A
Publication Date:
March 18, 2009
Filing Date:
September 30, 1998
Export Citation:
Assignee:
Iwasaki Electric Co., Ltd.
International Classes:
F21S2/00; H05B37/02
Domestic Patent References:
| JP11203915A | ||||
| JP3283387A | ||||
| JP9266074A |
Attorney, Agent or Firm:
Sadao Minamino
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