JPS61208348A - Lamp drive circuit for key telephone set - Google Patents

Lamp drive circuit for key telephone set

Info

Publication number
JPS61208348A
JPS61208348A JP4882885A JP4882885A JPS61208348A JP S61208348 A JPS61208348 A JP S61208348A JP 4882885 A JP4882885 A JP 4882885A JP 4882885 A JP4882885 A JP 4882885A JP S61208348 A JPS61208348 A JP S61208348A
Authority
JP
Japan
Prior art keywords
lamp
key telephone
drive circuit
button
depression
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.)
Pending
Application number
JP4882885A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Uejima
Noriyuki Takagi
Original Assignee
Nec Corp
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 Nec Corp filed Critical Nec Corp
Priority to JP4882885A priority Critical patent/JPS61208348A/en
Publication of JPS61208348A publication Critical patent/JPS61208348A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reduce the power consumption by increasing a current to drive a lamp of a key telephone set for a prescribed time so as to light the lamp and facilitating to observe the lamp lighting state even at a location difficult to see.
CONSTITUTION: In depressing a key telephone set operating button 1, the depression of the key telephone set operating button 1 is detected by a button depression circuit 2 and a lamp drive circuit 3 lights a key telephone set display lamp 4 by a lamp drive circuit 3. When the key telephone set display lamp 4 is difficult to see depending on the surrounding state, the lamp current variable button 5 is depressed and the button depression detecting circuit 2 detects the depression of the lamp current variable button 5, a timer circuit 6 is activated, the lamp drive circuit 3 varying the lamp current is controlled timewise, the lamp drive circuit 3 is operated for a prescribed time only to increase the lamp current. Thus, the key telephone set display lamp 4 is lighted for a prescribed time.
COPYRIGHT: (C)1986,JPO&Japio
JP4882885A 1985-03-12 1985-03-12 Lamp drive circuit for key telephone set Pending JPS61208348A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4882885A JPS61208348A (en) 1985-03-12 1985-03-12 Lamp drive circuit for key telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4882885A JPS61208348A (en) 1985-03-12 1985-03-12 Lamp drive circuit for key telephone set

Publications (1)

Publication Number Publication Date
JPS61208348A true JPS61208348A (en) 1986-09-16

Family

ID=12814091

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4882885A Pending JPS61208348A (en) 1985-03-12 1985-03-12 Lamp drive circuit for key telephone set

Country Status (1)

Country Link
JP (1) JPS61208348A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177643A (en) * 1987-01-19 1988-07-21 Matsushita Electric Ind Co Ltd Key telephone set

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177643A (en) * 1987-01-19 1988-07-21 Matsushita Electric Ind Co Ltd Key telephone set

Similar Documents

Publication Publication Date Title
JPH02129690A (en) Portable radio equipment with display
JPS61208348A (en) Lamp drive circuit for key telephone set
JPH04236139A (en) Uninterruptible power supply
JPH01121914A (en) Display device
JPH03120515A (en) Lcd backlight device
JPS61215497A (en) Electric fan
JPS51127583A (en) Lighting apparatus
JPS5529728A (en) Battery life display unit of electronic watch
JPH04233854A (en) Portable telephone set
JPH0363622A (en) Video display device
JPH03111695A (en) Electric fan
JPS5526481A (en) Electronic watch
JPS61140960A (en) Print switch of control panel for copying machine
JPH01231294A (en) Lighting equipment
JPS62255257A (en) Pushbotton type room lamp control device
JPS55121185A (en) Electronic watch with illuminator
JPH02278922A (en) Key input device
JPH04280800A (en) Engine rotation adjusting device for high-altitude working vehicle
JPH0434375A (en) Output power display apparatus
JPH03250894A (en) Lpg management data transmission terminal equipment
JPH03177170A (en) Electronic still camera
JPS58111782A (en) Electronic time piece
JPS6298948A (en) Telephone set handset
JPH03112090A (en) Illuminating device
JPH0370099A (en) Push button device for pedestrian