JPS6433888A - Discharge lamp lighting device - Google Patents

Discharge lamp lighting device

Info

Publication number
JPS6433888A
JPS6433888A JP18846387A JP18846387A JPS6433888A JP S6433888 A JPS6433888 A JP S6433888A JP 18846387 A JP18846387 A JP 18846387A JP 18846387 A JP18846387 A JP 18846387A JP S6433888 A JPS6433888 A JP S6433888A
Authority
JP
Japan
Prior art keywords
preheating
state
count
discharge lamp
period
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
JP18846387A
Other languages
Japanese (ja)
Inventor
Satoshi Kubota
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP18846387A priority Critical patent/JPS6433888A/en
Publication of JPS6433888A publication Critical patent/JPS6433888A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

PURPOSE:To avoid such a trouble that the preheating state and the lighting state are repeated in turn and a flickering state is continued for a long time at the terminal stage of the life of a discharge lamp by providing a counter counting the number of returns to the preheating state and fixing the on-period of the separately excited signal when the number of counts reaches a fixed value or more. CONSTITUTION:The output of a preheating timer circuit 6 is inputted to a preheating count circuit 7 to count the number of occurrences. The preheating count circuit 7 contains (n) D-flipflops DF1-DFn. After the count output of the preheating count circuit 7 is generated, a transistor Tr1 is forcibly kept at an on-state, thus the on-period of the separately excited signal is fixed to a short period to obtain a preheating state. An uncomfortable flickering phenomenon caused by the repetition of the preheating state and the full lighting state occurring at the terminal state of the life of a discharge lamp DL can be thereby avoided.
JP18846387A 1987-07-28 1987-07-28 Discharge lamp lighting device Pending JPS6433888A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18846387A JPS6433888A (en) 1987-07-28 1987-07-28 Discharge lamp lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18846387A JPS6433888A (en) 1987-07-28 1987-07-28 Discharge lamp lighting device

Publications (1)

Publication Number Publication Date
JPS6433888A true JPS6433888A (en) 1989-02-03

Family

ID=16224151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18846387A Pending JPS6433888A (en) 1987-07-28 1987-07-28 Discharge lamp lighting device

Country Status (1)

Country Link
JP (1) JPS6433888A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01231295A (en) * 1988-03-09 1989-09-14 Toshiba Electric Equip Corp Discharge lamp lighting device
JPH0633399U (en) * 1992-09-30 1994-04-28 富士通テン株式会社 Backlight illumination device for display device
US5749444A (en) * 1995-10-31 1998-05-12 Otis Elevator Company Contactless slide guide for elevators

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01231295A (en) * 1988-03-09 1989-09-14 Toshiba Electric Equip Corp Discharge lamp lighting device
JPH0633399U (en) * 1992-09-30 1994-04-28 富士通テン株式会社 Backlight illumination device for display device
US5749444A (en) * 1995-10-31 1998-05-12 Otis Elevator Company Contactless slide guide for elevators

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