JPS54152803A - Lamp control system for telephone set - Google Patents

Lamp control system for telephone set

Info

Publication number
JPS54152803A
JPS54152803A JP6064678A JP6064678A JPS54152803A JP S54152803 A JPS54152803 A JP S54152803A JP 6064678 A JP6064678 A JP 6064678A JP 6064678 A JP6064678 A JP 6064678A JP S54152803 A JPS54152803 A JP S54152803A
Authority
JP
Japan
Prior art keywords
lamp
time
switch
control system
lamp control
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
JP6064678A
Other languages
Japanese (ja)
Other versions
JPS6219102B2 (en
Inventor
Masato Araki
Eiji Morikami
Takeo Oba
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.)
Iwatsu Electric Co Ltd
Original Assignee
Iwatsu Electric Co 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 Iwatsu Electric Co Ltd filed Critical Iwatsu Electric Co Ltd
Priority to JP6064678A priority Critical patent/JPS54152803A/en
Publication of JPS54152803A publication Critical patent/JPS54152803A/en
Publication of JPS6219102B2 publication Critical patent/JPS6219102B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To realize the power conservation for the lamp display unit by flowing the lamp current only for the necessary time by maintaining the display state of the lamp for the fixed time from the moment the handset is picked up via the switch coupling the hook switch. CONSTITUTION:Timer TM consisting of, for example, the monostable multivibrator or the like is actuated by switch HS3 coupling the hook switch, and thus transistor Tr2 is turned on for the fixed time from the moment the handset is picked up to maintain the display state of the lamp for that time. As a result, no lamp current is flowed at the holding time except for the necessary time, thus saving the power for the lamp display unit.
JP6064678A 1978-05-23 1978-05-23 Lamp control system for telephone set Granted JPS54152803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6064678A JPS54152803A (en) 1978-05-23 1978-05-23 Lamp control system for telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6064678A JPS54152803A (en) 1978-05-23 1978-05-23 Lamp control system for telephone set

Publications (2)

Publication Number Publication Date
JPS54152803A true JPS54152803A (en) 1979-12-01
JPS6219102B2 JPS6219102B2 (en) 1987-04-27

Family

ID=13148294

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6064678A Granted JPS54152803A (en) 1978-05-23 1978-05-23 Lamp control system for telephone set

Country Status (1)

Country Link
JP (1) JPS54152803A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339632A (en) * 1980-11-26 1982-07-13 Bell Telephone Laboratories, Incorporated Button illumination for repertory dialer with low battery voltage indication
JPH0370295A (en) * 1989-08-09 1991-03-26 Tamura Electric Works Ltd Key telephone set having radio slave set

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339632A (en) * 1980-11-26 1982-07-13 Bell Telephone Laboratories, Incorporated Button illumination for repertory dialer with low battery voltage indication
JPH0370295A (en) * 1989-08-09 1991-03-26 Tamura Electric Works Ltd Key telephone set having radio slave set

Also Published As

Publication number Publication date
JPS6219102B2 (en) 1987-04-27

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