Lamp

Details Lamp Lamp

2001-07-26

2004-09-14

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For filament

C313S273000, C313S277000

Reexamination Certificate

active

06791247

ABSTRACT:

BACKGROUND OF THE INVENTION
This invention relates to a lamp comprising at least one lead rod and a plurality of filaments.
SUMMARY OF THE INVENTION
Heretofore, spotlighting at a studio and a stage or the like has been performed by combining a halogen lamp with a reflector in general.
FIG. 9
is a view showing a conventional example of a halogen lamp for the studio. This halogen lamp
100
comprises a base
101
and a glass tube
102
is provided on the upper of this base
101
. Two pieces of lead rod
105
fixed by two pieces of glass piece
103
and
104
are arranged on the inside of the glass tube
102
. The glass piece
103
fixes the upper end of two pieces of lead rod
105
and another glass piece
104
fixes the central portion of two pieces of lead rod
105
. Moreover, a plurality of filaments
106
connected to each other in series is arranged between the glass pieces
103
and
104
. These plurality of filaments
106
are supported by a support
108
, and both ends
106
a
of these plurality of filaments
106
connected each other in series are connected with windings
107
wound in the form of a coil. The windings
107
are welded in the condition of being passed through the lead rods
105
, thereby electrically connects a plurality of filaments
106
with the lead rod
105
. When attaching the reflecting mirror to the halogen lamp
100
having a structure shown in FIG.
9
and using this halogen lamp
10
, there has been a problem that the light emitted from the filament
106
is shut off by the lead rod
105
, so that lack of uniformity of luminous intensity distribution are caused.
The object of the invention is to provide a lamp capable of suppressing lack of uniformity of luminous intensity distribution.
The present invention is characterized in that the plurality of filaments is arranged around said lead rod. When arranging a plurality of filaments around the lead rod, the light emitted from the filaments is irradiated approximately uniformly toward the surroundings of the lamp without being shut off by the lead rod, whereby lack of uniformity of luminous intensity distribution can be suppressed.
Here, the lamp according to the invention preferably comprises a plurality of filament structure elements, each of the filament structure elements having the plurality of filament, and the lamp comprises a plurality of the lead rod, wherein one of the plurality of the lead rod connects each of the plurality of filament structure elements. Vibration resistance of a lamp can be improved by connecting each of a plurality of the filament structure elements to the one lead rod.


REFERENCES:
patent: 3555338 (1971-01-01), Scoledge et al.
patent: 3622832 (1971-11-01), Schlessel et al.
patent: 3909653 (1975-09-01), Bottone et al.
patent: 3986067 (1976-10-01), De Fraeye
patent: 4145630 (1979-03-01), DeCaro et al.
patent: 4311940 (1982-01-01), Fitzgerald et al.
patent: 4317060 (1982-02-01), Fitzgerald et al.
patent: 4366411 (1982-12-01), Robinson
patent: 4553066 (1985-11-01), Fields et al.
patent: 4658180 (1987-04-01), Ooms
patent: 4823048 (1989-04-01), Ooms
patent: 5900696 (1999-05-01), Buschmann et al.

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