Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch cut-out
Reexamination Certificate
1998-06-18
2001-02-06
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch cut-out
C315S224000, C315S307000, C315S308000
Reexamination Certificate
active
06184632
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lighting apparatus for lighting a discharge lamp.
2. Description of the Related Art
The technique to detect wattage of a discharge lamp by detecting an electrical characteristic of the discharge lamp when it is lighted in order to prevent the erroneous mounting of a discharge lamp having a different rated lamp voltage in a socket has been disclosed in Japanese Published Unexamined Patent Application JP-A No, 7-106088.
This type of lamp base has become commonly used for different kinds of lamps in recent years because different kinds of lamps may be erroneously mounted in different kinds of lamp sockets.
However, in the conventional technology disclosed in the Published Unexamined Patent Application JP-A No. 7-106088, there is a problem that even the same type lamps have different wattage ratings, it is not possible to prevent erroneous mounting of these high pressure discharge lamps and incandescent lamps.
Further, in the above-mentioned conventional technique, in order to detect that a lamp mounted in a socket is properly adapted from the viewpoint of its type and rated power, the mounted lamp must be lighted. Therefore, if a high pressure discharge lamp that has a lower rated lamp power is lighted in a high pressure discharge lamp lighting apparatus, this lamp receives an overcurrent and may possibly burst.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a lighting apparatus capable of detecting whether a lamp mounted in a socket is a adapted lamp without necessity of lighting it
The lighting apparatus of the present invention is composed of a discharge lamp incorporating a detecting element having a predetermined electrical characteristic, a detector circuit for discriminating the electrical characteristic of the detecting element and a lighting circuit for lighting the discharge lamp according to the output from the detector circuit.
REFERENCES:
patent: 4322658 (1982-03-01), Minarczyk
patent: 4377772 (1983-03-01), Tsuchihashi et al.
patent: 4442382 (1984-04-01), Fleck
patent: 4520294 (1985-05-01), Iida et al.
patent: 5023516 (1991-06-01), Ito et al.
patent: 5103143 (1992-04-01), Daub
patent: 5442257 (1995-08-01), Mitsumoto
patent: 5523656 (1996-06-01), Luursema
patent: 5583399 (1996-12-01), Rudolph
patent: 5589740 (1996-12-01), Rudolph et al.
patent: 5663613 (1997-09-01), Yamashita et al.
patent: 5705897 (1998-01-01), Hanazaki et al.
patent: 5773937 (1998-06-01), Miyazaki et al.
patent: 5869935 (1999-02-01), Sodhi
patent: 091728 (1983-10-01), None
patent: 2072958 (1981-10-01), None
patent: 2132834 (1984-07-01), None
patent: 2318932 (1998-05-01), None
patent: 8-31589 (1996-02-01), None
Kamata Masahiko
Mita Kazutoshi
Takita Kazuo
Lee Wilson
Pillsbury Madison & Sutro LLP
Toshiba Lighting & Technology Corporation
Wong Don
LandOfFree
Lighting apparatus including circuit to detect an electrical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lighting apparatus including circuit to detect an electrical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lighting apparatus including circuit to detect an electrical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2580836