JPS56112338A - Alarm device for forgetting of light turning-off - Google Patents

Alarm device for forgetting of light turning-off

Info

Publication number
JPS56112338A
JPS56112338A JP1567380A JP1567380A JPS56112338A JP S56112338 A JPS56112338 A JP S56112338A JP 1567380 A JP1567380 A JP 1567380A JP 1567380 A JP1567380 A JP 1567380A JP S56112338 A JPS56112338 A JP S56112338A
Authority
JP
Japan
Prior art keywords
light
tunnel
circuit
alarm
car
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP1567380A
Other languages
Japanese (ja)
Other versions
JPS6141774B2 (en
Inventor
Yasuhiro Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Ten Ltd
Original Assignee
Denso Ten Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Ten Ltd filed Critical Denso Ten Ltd
Priority to JP1567380A priority Critical patent/JPS56112338A/en
Publication of JPS56112338A publication Critical patent/JPS56112338A/en
Publication of JPS6141774B2 publication Critical patent/JPS6141774B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Emergency Alarm Devices (AREA)

Abstract

PURPOSE: To permit the alarm for forgetfulness of light turning-out to be generated with a simple circuit constitution without eliminating wrong operation due to the illuminating light in a tunnel, when the light of a car is lighted-up in the tunnel in travelling in the day time and turn-off the light is forgotten after clearing the tunnel.
CONSTITUTION: The apparatus is equipped with a photosensor 11 in the car, which detects whether the car is in dark environment such as in a tunnel or in bright environment. The output of the photosensor 11 is input into a hysteresis circuit 13 through a delaying element 12, and in the circuit 13, the hysteresis characteristic is applied to the input signal, having a fixed standard voltage level as a center. The output of the circuit 13 is compared with the standard voltage lever in a comparison circuit 14, and discrimination of dark or light range is performed, and the objective alarm signal A is output. Due to this alarm signal, an alarm lamp or alarm buzzer is operated. Each element 11W14 is operated by a common light source 15.
COPYRIGHT: (C)1981,JPO&Japio
JP1567380A 1980-02-12 1980-02-12 Alarm device for forgetting of light turning-off Granted JPS56112338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1567380A JPS56112338A (en) 1980-02-12 1980-02-12 Alarm device for forgetting of light turning-off

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1567380A JPS56112338A (en) 1980-02-12 1980-02-12 Alarm device for forgetting of light turning-off

Publications (2)

Publication Number Publication Date
JPS56112338A true JPS56112338A (en) 1981-09-04
JPS6141774B2 JPS6141774B2 (en) 1986-09-17

Family

ID=11895258

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1567380A Granted JPS56112338A (en) 1980-02-12 1980-02-12 Alarm device for forgetting of light turning-off

Country Status (1)

Country Link
JP (1) JPS56112338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991597A (en) * 1982-11-18 1984-05-26 ニツタン株式会社 Abnormality alarm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5991597A (en) * 1982-11-18 1984-05-26 ニツタン株式会社 Abnormality alarm

Also Published As

Publication number Publication date
JPS6141774B2 (en) 1986-09-17

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