US2273520A - Light source - Google Patents

Description

Feb. 17, 1942. A, F. HENNINGER ETAL 2,273,520

' LIGHT SOURCE Original Filed Dec. 23, 193'? 2 Sheets-Sheet l I .25 a 27 10 I 25 22 j Z] I 21 Feb. 17, 1942. A. F. HENNINGER ET AL 2,273,520

LIGHT SOURCE Original Filed Dec. 23, 1957 2 Sheets-Sheet 2 fizz/971 27152 Qua few f. finnz'n c er and I 6607;9'6 .D Jyzzn 72367 Patented Feb. 17, 1942 Y -2,273,52o- I LIGHT SOURCE Andrew F. Henninger and George D. Henninger,

Chicago, Ill.

, Original application December 23, 1937, Serial No.- 181,361. Divided and this application September 26, 1940, Serial No. 358,404

6 Claims. (Cl. 176122) This application is being filed as a division of our co-pending application Serial, No. 181,361, filed December 23, 1937.

The present invention relates to means for providing a reliable light source which has a low current consumption and which is particularly adapted for instance for use as a danger signal or a light where high visibility and low current consumption are important factors in determining the success of the light unit. It is the principal purpose of this invention to pro- .vide a light source in the form of a compact tube or envelope having therein a gaseous filling adapted tobe excited by the passage of electric current therethrough to produce light. within the envelope, the construction of parts in the envelope being such that a concentrated glow due to the light in the positive column is combined with additional emission of light by a glow within the envelope outside of the positive column.

The present invention contemplates, as a means for carrying out the purposes of the invention, an envelope containing a gaseous filling which is made up preferably of one or more of the monatomic gases such as neon, helium, argon, krypton and xenon, and mercury vapor. The envelope is provided with means for maintaining the gaseous filling at a high degree of purity, and care is exercised in the manufacture of the device to insure theoriginal purity of the gas filling. The envelope contains an elongated tube which opens into the interior of the envelope whereby to be filled with the gaseous filling of the envelope, the tube being provided at a point most remote from the opening with an electrode, and the envelope being provided with an electrode which is also spaced from the opening of the tube into the interior of the envelope.

The invention also contemplates the provision of a device of the aforementioned characteristics wherein the tube within the envelope is bent into a tortuous form enabling one to use a comparatively long length of tubing inwhich successive sections are closely adjacent to each other to pro vide a concentrated source of light emission, which although concentrated, does not have the characteristics of a point or a line source of emission such as is normally associated with incandescent filaments.

The features and advantages of the invention will appear more fully as the description proceeds in connection with the accompanying drawings wherein a preferred form of the invention is shown. It is to be understood however that the drawings and description are illustrative only and should not be 'considered as limiting the invention except insofar as it is limited by the claims.

In the drawings:

Fig, 1 is a view in side elevation of a lighting unit embodying the invention, certain parts being shown in section;

Fig. 2 is a plan sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a view similar to Fig. 1 showing a slightly modified form of the invention;

Fig, 4 is a fragmentary view in side elevation taken on the line 44 of Fig. 3;

Fig. 5 is a vertical sectional view taken on the line 55 of Fig. 6 and illustrating a modified form;

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 5; and

Fig. 7 is a sectional view takenon the line 1-1 of Fig. ,6.

Referring now in detail to the drawings, the presentinvention is embodied in a gaseous conducti on tube comprising an envelope II] which may be made of glass or other suitable material. The envelope I0 is mounted upon a suitable base II in the usual manner and is provided with a re-entrant stem I2 through which a series of leads I3, I4 and I5 extend. The base has terminal plugs I6, I! and I8 for the leads. The leads I3 and I5 carry electrodes I9 and 20, each of which has thereon a body 2| of a suitable clean-up material which is adapted to clean up the impurities in the envelope I0. The material of the electrodes I9 and 20 preferably is nickel in the form of .a plate which is secured to the lead by any suitable means to establish a good electrical and mechanical connection. Other materials, of course, may be used if suitable for the electrodes. The lead I4 terminates in an electrode 22 which is quite small in surface area as compared to the electrodes I9 and 20. It desir- The construction of the tube 24 is preferably such as to incorporate a substantial length of tubing in a small space. As shown in Figs. 1 and 2, tube24 is bent into a tortuous outline by doubling itback and forth upon itself so that a tube much longer than the length of the envelope III may be placed within the envelope. The free end of the tube 24 shown at 26 is open to the interior of the envelope l and is spaced substantially as far from the normally active electrode l9 as it can be.

In making up the device, the envelope Ill before it is sealed, is preferably treated in the usual manner to get all. of the foreign gases out of the interior thereof and out of the glass tubes 23 and 24. The envelope is then evacuated and filled with a suitable gas or mixture of gases such as one or more of the gases hereinbefore mentioned. For the purpose of providing a light source of high visibility, we prefer to use neon gas because itjhas the characteristic of being visible for a greater distance through fog and similar atmospheric conditions than gases giving other colors of light. A relatively high vacuum is desired in the envelope, and the impurities which develop in the initial operating of the tube are cleaned up by the clean up material 2| upon the electrodes 19 or 20 inoperation. Normally, the source of 'currentis connected across the electrodes l9 and 22 for the purpose of operation and the electrode 20 is only used when impurities tend to adversely affect the glow within the envelope. The bodies 2| which are usually referred to as flash'pellets are preferably composed of a combination of barium and magnesium although, of course, other known clean up agents commonly used for this purpose such as casein may be employed. By maintaining an extreme purity of the gas, the flaming effect such as is described in Henninger Patent No. 2,020,413 may be obtained in the envelope l0 outside of the tube 24.

Inl operation, the terminals I6 and I! are desirably connected to a source of alternating current or direct current. The large electrodes I9 and 20 serve as cathodes while the small electrode 22 acts as an anode. With alternating current point to plate rectification takes place and therefore the sputtering, if any, is confined to the large electrodes such as H! or 20. The light emitted from within the tube 24 is the positive column portion and therefore a relatively intense emission of light is obtained from the tube 24. Owing to the purity of the gas filling and the arrangement of the electrode [9 in spaced relation to the open end 26 of the tube- 24, the interior of the envelope around the tube 24 produces further emission of light and the flaming effects hereinbefore mentioned which add to the efficiency of the device as a source of light.

Referring now to the form of the invention shown in Figs. 3 and 4, the tube 24a is shown here as coiled into a spiral helix, the electrode l9a being located back of the apex of the helix and the open end 26a of the tube 24a being at the remote end of the tube from the electrode I9a. The electrode 20a is placed below the tube 24a so as to give a clear unobstructed view of the open end of the helix. In this form of the invention, if desired, the envelope I0 may be coated so as to render it opaque except on the side 21 toward which the helix faces.

Referring now to Figs -7, inclusive, the form of the invention shown therein is one in which the inner tortuous tube construction comprises a. pair of tubes 28 and 29. The tube 28 is sealed to a tube 30 that is mounted in the stem I 2b 7 of the envelope ID. The tube29 is sealed to'a tube 3| that is also mounted directly in the stem [21), the seal in this form of the invention as in the other forms being spaced well above the upper ends of electrodes 32 and 33 in the tubes 30 and 3|, respectively. The upper ends of the tubes 28 and 29 are turned inwardly toward each other as shown at 34 and 35 and are connected by a sleeve 36. The sleeve 36 comprises a strip which is folded around the ends 34 and 35 and secured to a Wire support 31 that extends upwardly from the stem I212. The sleeve 36 is provided with an opening- 38 that is directed downwardly and an electrode I9!) is mounted directly below the opening 38, being spaced from the opening a substantial distance as shown clearly in Figs. 5 and 7. An auxiliary electrode 20b is provided as in the other forms for the purpose of supplying clean up material in the event that impurities adversely affect the operation of the device after it is completed.

It will be noted from an inspection of Fig. 6 that the tubes 28 and 29 are bent to form a substantially cylindrical outline and that the discharge from the electrodes 32 and 33 in the device passes through the opening 38 and then downwardly at the center of the cylindrical outline to the cathode I9b. In order to regulate the flow of current to two tubes 28 and 29 any suitable regulating means such as resistances 39 and 40 may be employed between the electrodes 32 and 33 and their connection to the source of current.

As stated hereinbefore, the curved tubing in each form of the device is sealed to the tubing that is mounted in the stem at a point well above the electrode that is within the tubing. In sealing tubing of this character together, the joint may be rough and thin in spots and therefore the seal is made at a point remote from the electrode. This protects tubing against breakdown in bombardment of the device by providing a solid tube at the point of greater stress which is directly between the electrodes in the tubes and the electrodes that are in the envelope outside the tubes.

This device is particularly advantageous when used as a channel marker or buoy light for aid in navigation. It may be operated from batteries by means of an interrupter at a very low current consumption The current from the interrupter may be passed through a transformer to give the necessary high voltage, and owing to the arrangement 'of the tube within the envelope and the large and small electrodes, the current is substantially limited to a flow in one direction. High visibility with low current consumption makes it possible to use this device without providing such a heavy and extensive battery unit as is necessary for operating incandescent lamps under the same conditions. The comparative tests which have been made show that with this device we can obtain a visibility equal to that obtained 'with modern incandescent lamps using about five to ten times the current necessary for this device.

The construction of the device gives a large unit or body of light in contrast to the line or point of line obtained from a filament. the light is projected through a lens, it is visible over a wider area than the filament type of light because of this larger body. Therefore, the tipping of the support, which is a factor to be considered in floating markers, does not afiect the visibility of.the marker as much as it would a marker with a point source of light.

When it is desired to cleanup impurities in the gas that appear after the device hasbeen in operation, it is not necessary to apply exces- When sive current or a high heat tothe device. When the gas is in need of purification, we merely connect the electrode 20 which is normally not in service into the circuit with one of the other electrodes, to use up the flash pellet 2| thereon and thus purify the gas.

From the above description, it is believed that the construction and advantages of this device will be readily apparent to those skilled in this art. Having thus described our invention,-what we claim as new and desire to secure by Letters Patent is:

'1. A gaseous conduction device comprising a gas filled envelope, an electrode therein, a pair of tubes therein, each tube having one end sealed to the envelope and provided with an electrode, each tube being open to the interior of the envelope at its free end and a supporting sleeve connecting the open ends of said tubes.

2. A gaseous conduction device comprising a gas filled envelope, an electrode therein, a pair of tubes therein, each tube having one end sealed to the envelopeand provided with an electrode, each tube being open to the interior of the envelope at its free end, a supporting tubular member connecting the open ends of said tubes and a standard fixed to the envelope and carrying the supporting member, said tubes being bent to form closely spaced undulations arranged about the first named electrode.

3. Means for providing a, concentrated light source, comprising in combination an outer envelope filled with a gaseous medium adapted to emit light when excited by the passage of electric current through it, an elongated translucent tube having one end sealed to the envelope and the other end opening into the interior of said envelope, said envelope having an inwardly directed stem in which the said sealed end of said tube is mounted, and from which said tube projects, an electrode in said tube at the fixed end, and a second electrode mounted on said stem outside of the tube and in spaced relation with respect to the open end thereof, said tube having a central portion extending directly away from the stem and an undulating portion extending about the stem, the undulations running parallel to the axis of the stem throughout the greater part of the length.

4. Means for providing a light source comprising in combination an outer envelope filled with a gaseous medium adapted to emit light when excited by the passage of electric current through it, an elongated translucent tube mounted in said envelope and having an opening to the interior of the envelope, the tube having an anode therein remote from said opening and the envelope having a cathode spaced from said opening, said tube having a central portion extending directly away from the stem and an undulating portion extending about the stem,

the undulations running parallel to the axis of the stem throughout the greater part of its length.

5. Means for providing a light source comprising in combination an outer envelope filled with a gaseous medium adapted to emit light when excited by the passage of electric current through it, an elongated translucent tube mounted in said envelope and having an opening to the interior of the envelope, the tube having an electrode therein at the mounted end thereof and remote from said opening, and the envelope having an electrode spaced from said opening, said tube comprising a plurality of undulations arranged in a curved path about the last named electrode.

6. Means for providing a light source comprising in combination an outer envelope filled with a gaseous medium adapted to emit light when excited by the passage of electric current through it, an elongated translucent tube mounted in said envelope and having an opening to the interior of the envelope, the tube having an electrode therein at the mounted end thereof and remote from said opening, and the envelope having an electrode spaced from said opening, said tube comprising a plurality of undulations disposed in an annular path about an axis which extends perpendicularly to said last named electrode.

ANDREW F. HENNINGER. GEORGE D. HENNINGER.

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