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Jan. 18, 1949.
Filed July 14, 1947
@0272‘ a
Patented Jan. 18, 1949
2,459,633 LAMP
Clarence E. Farris, Fort Monroe, Va.
Application July 14, 1947, Serial No. 760,782
3 Claims; (Cl. 176-122)
This invention relates to ?uorescent light bulbs.
An object of this'invention is to provide an
improved light bulb‘ embodying an inner‘ closed
20 and 2| within which a pair of spiral elec
trodes 22 and 23 are adapted to seat. The elec
trodes 22 and 23 are extended over the end wall
tube or body and an outer envelope disposed in
- closely spaced relation with respect to the inner
tube, thereby forming a very restricted» space
‘ l8 or the inner tube I5 and are then extended
within which a gaseous element is positioned and
within which space the electrodes are also posi
is preferably coated as indicated at 24 with a
Another object of this invention is to provide
a ?uorescent light bulb which is so constructed
through the nipple M for connection with a
source of electric current supply. Each electrode
coating of thorium oxide and the body it of
the inner tube I5 is then coated with a coat
ing 25 which also engages at least partly about '
the coating 24 of the electrodes.
The coating or covering 25 is formed of. porous
?uorescent material in the form ‘of magnesium
tungstate or other suitable ?uorescent material.
and the absence of wasted gas radiations.
A further object of this invention is to pro 15 While the inner tube or body i5 is shown as be
ing ‘hollow and closed at each end, it will‘ bev
vide a ?uorescent light bulb wherein there will be
understood that this body may be formed as
a more intimate contact between the ultra-violet
a solid, the purpose of the body beingv primarily
radiations and the ?uorescent materials which
to form a restricted chamber of substantially
will utilize the maximum direct action of such
20 cylindrical con?guration which is adapted to be
materials rather than casual surface contact.
initially evacuated in any conventional manner
With the above and other objects in View, my
and then ?lled with the desired gaseous material.
invention consists in the arrangement, combina
It will be understood that the ?uorescent tube ‘
tion and details of construction disclosed in the
herein disclosed may have connected'with at
drawings and speci?cation, and then more partic
. least one electrode, a conventional resistor and
ularly pointed out in the appended claims.
and arranged as to produce a greater intensity
of light due to the greater activity of the ions
In the drawing,
a condenser may be connected with or inter
Figure 1 is a longitudinal section of a ?uores
cent tube constructed according to an embodi
ment of this invention,
Figure 2 is a sectional view taken on the line
2-2 of Figure 1; and
With a ?uorescent tube as herein before described,
by con?ning the space within which the electrodes
are positioned and in‘ which the gas or vapor ‘is
positioned, the reaction between the electrodes
Figure 3 is a diagrammatic view of ‘the elec
trodes within the tube.
posed in' the other electrode exteriorly of the tube.
and the fluorescent material and gas or vapor
will be more active ‘and will thereby produce a
greater intensity of light than is the case Where
Referring to the drawing, the numeral l0
designates generally an outer envelope or casing 35 the electrodes are disposed at the opposite ends
of transparent material such as glass or the
of the gasi?ed tube as in conventional gaseous
like, which includes an elongated cylindrical body
ll having end walls I! and I3.
or ?uorescent tubes.
Furthermore, the provision of the inner body
The end wall 12 is formed with a tubular . which produces the con?ned or restricted ‘gas
nipple [4 through which the electrodes to be 40 space .will eliminate wasted gas radiations and
produce a maximum direct action in contrast to
hereinafter described are adapted to'be extended.
An inner closed tube generally designated as I5
the casual surface contact embodied in conven
is disposed within the envelope l0 and includes
a cylindrical body l6 formed with closed opposite
tional ?uorescent tubes.
ends l1 and I8,
The inner tube l5 forms a restricted cylindrical
space or chamber [9 within the envelope l0,
which chamber is adapted to be evacuated and
I do not mean to con?ne myself to the exact
details of construction herein disclosed but claim
all variations falling within the purview of the
J appended claims.
What I claim is:
_ >
1. A gaseous discharge tube comprising an
then ?lled with a gaseous material or vapor,
the gas being either neon, argon, or helium, and 50 outer evacuated envelope, a closed tube within
said envelope and spaced therefrom providing
the vapor being a mercury vapor. If desired,
a restricted space between said tube and envelope,
there may be a mixture of the gas and mercury
a pair of spiral electrodes about said closed tube
and within said restricted space, a thorium oxide
The cylindrical body l6 of the inner closed
tube i5 is formed with a pair of spiral grooves 55 coating about said electrodes, and a ?uorescent
coating about said closed tube and said elcc~
about said closed tube and said electrodes.
' 2. A gaseous discharge tube comprising an
outer evacuated envelope, a closed tube within
said envelope and spaced therefrom forming Ya a
summons mm
restricted cylindrical space.‘ said'closed tube
reierences are or record in the
having a pair of spiral grooves in the outer
iile oi“ this patent:
surface thereof, and a pair of spiral electrodes
seated in said spiral grooves.
3. A gaseous discharge tube comprising an 10 Number
outer evacuated envelope, a closed tube within
said envelope and spaced therefrom forming a
- restricted cylindrical space. said closed tube
having a pair of spiral grooves in the outer sur
face thereof, a pair of spiral electrodes seated 1;
Addink et a1. _____ __ Nov. 8, ms. _
Great Britain ______ -- Apr. 4, 1039
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