Electric lamp and discharge devices – With envelope – Having base and connector
Reexamination Certificate
2000-07-19
2003-11-25
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With envelope
Having base and connector
C313S318120, C313S318100, C439S613000, C439S615000
Reexamination Certificate
active
06653770
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to bulb-form lamps.
BACKGROUND OF THE INVENTION
In a conventional lamp such as a bulb-form fluorescent lamp, as shown in
FIG. 6
, a fluorescent tube
4
, a lighting circuit
5
to light this fluorescent tube
4
, and two lead wires
11
a
and
11
b
brought into connection with this lighting circuit
5
and supplying power thereto are housed in an envelope
19
comprising a globe
1
and a case
18
.
At one end of the case
18
, a base
20
is screwed in. This base
20
has a screw-form shell
20
a
and an eyelet
20
c
provided at one end of this shell
20
a
via glass-made insulator
20
b
. Portions respectively of the shell
20
a
and the eyelet
20
c
are embedded into the insulator
20
b
, and thereby the shell
20
a
, the insulator
20
b
, and the eyelet
20
c
are integrated.
One lead wire
11
a
is brought into connection with the base
20
on the outside, that is, onto the outer surface of the eyelet
20
c
by soldering.
Also, the lead wire
11
a
and the eyelet
20
c
are brought into connection by plasma arc welding from the environmental view point.
The manufacturing method of such a conventional lamp is as follows.
After an envelope
19
, a fluorescent tube
4
, and a lighting circuit
5
with which lead wires
11
a
and
11
b
are brought into connection are assembled by means of a normal method, the base
20
is screwed into one end portion of the case
18
and undergoes caulking to be fixed into the case
18
. In that occasion, one lead wire
11
a
is arranged to be led out from a through hole
20
d
formed in the eyelet
20
c
. In addition, the portion led out from this lead wire
11
a
is brought into connection with the outer surface of the eyelet
20
c
by means of soldering or plasma arc welding.
However, in such a conventional lamp, in the case where the lead wire
11
a
is brought into connection with the eyelet
20
c
, flux (resin, etc.) used for soldering is formed as a film on the surface of soldering, and therefore, such a base
20
installed in a socket (not shown) of an illumination equipment causes the contact between the eyelet
20
c
and the socket to be incomplete. In addition, the eyelet
20
c
is corroded by this flux so that the eyelet
20
c
suffers from incomplete contact with the socket. There was a problem that due to such incomplete contact, lamps fail to be lighted.
In addition, there was a problem that the case where the lead wire
11
a
is brought into connection with the eyelet
20
c
by means of plasma arc welding gives rise to total costs since the plasma arc welding apparatus is expensive, requires a large installation space, and needs a lot of maintenance work.
The present invention has been achieved to solve these problems, and provides a low cost bulb-form lamp and a manufacturing method therefor, in which a lead wire is brought into connection with an eyelet easily and reliably without applying soldering or plasma arc welding, thereby preventing lighting failure due to incomplete contact is prevented.
DISCLOSURE OF THE INVENTION
A bulb-form lamp of the present invention includes a base having a screw form shell and an eyelet provided at an end portion of this shell via an insulator, and is configured so that a lead wire supplying power is brought into connection with a portion of the eyelet at other than the outer surface of the eyelet.
In addition, a first manufacturing method of a bulb-form lamp of the present invention is a method for manufacturing a bulb-form lamp including a base having a screw form shell and an eyelet provided in an end portion of this shell via an insulator, wherein a lead wire supplying power is brought into connection with a portion of the eyelet at other than the outer surface of the above described eyelet, comprising the steps of: leading out the lead wire from an eyelet receiving section formed in the insulator; bringing an end portion of the led out lead wire into connection with the eyelet; and fitting the eyelet into the eyelet receiving section.
The above described lamp and the manufacturing method therefor can bring the lead wire into connection with the eyelet easily and reliably without applying soldering or plasma arc welding and therefore, the failure of lighting due to incomplete contact can be prevented and cost saving can be achieved.
A second manufacturing method of the present invention is a method for manufacturing a bulb-form lamp including a base having a screw form shell and an eyelet provided at an end portion of this shell via an insulator, wherein a lead wire supplying power is brought into connection with a portion of the eyelet at other than the outer surface of the eyelet, comprising the steps of: leading out the lead wire from an eyelet receiving section formed in the insulator; disposing the led out lead wire along a side surface of the eyelet receiving section; fitting the eyelet into the eyelet receiving section; and sandwiching the lead wire between the eyelet and the insulator.
According to the above described manufacturing method, the lead wire can be brought into connection with the eyelet easily and reliably without applying soldering or plasma arc welding and therefore, the failure of lighting due to incomplete contact can be prevented and cost saving can be achieved. Also, without applying caulking or resistance welding, the lead wire can be brought into connection with the eyelet, and thus the manufacturing process can be simplified and production efficiency can be improved.
REFERENCES:
patent: 2336529 (1943-12-01), Cartun
patent: 5568009 (1996-10-01), Gandhi
patent: 59121757 (1984-07-01), None
patent: 4-94003 (1992-03-01), None
Ishitsuka Shinichiro
Matsuba Tetsuo
Matsumura Takeshi
Colón German
Parkhurst & Wendel L.L.P.
Patel Nimeshkumar D.
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