US2811671A - Electric discharge lamps - Google Patents

Electric discharge lamps Download PDF

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Publication number
US2811671A
US2811671A US593208A US59320856A US2811671A US 2811671 A US2811671 A US 2811671A US 593208 A US593208 A US 593208A US 59320856 A US59320856 A US 59320856A US 2811671 A US2811671 A US 2811671A
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United States
Prior art keywords
discharge tube
lamp
shielding member
electric discharge
tube
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Expired - Lifetime
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US593208A
Inventor
Molyneux Harold Grosvenor
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Siemens Edison Swan Ltd
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Siemens Edison Swan Ltd
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Publication date
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N5/00—Radiation therapy
    • A61N5/06—Radiation therapy using light
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/40—Devices for influencing the colour or wavelength of the light by light filters; by coloured coatings in or on the envelope
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/52—Cooling arrangements; Heating arrangements; Means for circulating gas or vapour within the discharge space
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/96—Lamps with light-emitting discharge path and separately-heated incandescent body within a common envelope, e.g. for simulating daylight

Definitions

  • the present invention relates to mercury vapour electric discharge lamps and more especially to lamps emitting ultra-violet rays for medical treatment and which are suitable for domestic use. Such lamps may be used domestically for producing a tanning effect of the human skin.
  • mercury vapour electric discharge lamps emit erythemal radiation which in the shorter wave lengths (e. g. the emission at a wave length of 2537 Angstrom units) may be harmful unless special precautions are taken and this radiation is present not only during the normal operation or the lamp but also during the running up period.
  • the amount of harmful radiation is reduced both in the normal operation of the lamp and during its running up period without reducing to an appreciable extent the beneficial longer wave ultra-violet radiation (e. g. the emission at a wave length of 3650 Angstrom units).
  • a mercury vapour electric discharge lamp in which the discharge tube proper is shielded to a partial but significant degree, so far as external objects irradiated by the lamp are concerned, by a shielding member composed of material that is transparent to radiation of wave lengths in a wide range extending from about 3000 Angstrom units upwards and including 3650 Angstrom units, but is substantially opaque to radiation of wave lengths in a wide range below 3000 Angstrom units and including 2537 Angstrom units.
  • the shielding member serves to filter out a portion of the lower wave length erythemal radiation emitted by the discharge tube.
  • a suitable material for this shielding member is the glass known under the trade name Pyrex.
  • the shielding member is in the form of a helix surrounding, but spaced from, the discharge tube proper.
  • the proportion of the total lower wave length erythemal radiation from the discharge tube which is rendered ineffective can readily be made to have a desired value by suitable choice of the dimensions of the member which is coiled to form the helix and of the diameter and pitch of the helix.
  • the dimensions of the helix may suitably be such that approximately one half the surface of the discharge tube proper is obscured when the lamp is viewed from the front.
  • the shielding member is in the form of a helix which surrounds the discharge tube proper and which is constituted by a coiled tube, and this coiled tube has running through it a length of resistance wire constituting a ballast resistance for the discharge tube, and the helix, although spaced from the discharge tube, surrounds the discharge tube sufficiently closely for the heat generated in said ballast resistance to shorten materially the time taken for the discharge tube to run up to the full discharge condition when the lamp is switched on.
  • the embodiment concerned takes the form of a mercury vapour electric discharge lamp for medical treatment, the lamp being one provided with a shielding member constituted by a coiled tube, and this coiled tube containing a ballast resistance for the discharge tube proper.
  • Fig. 1 of the drawings shows a front elevation of the lamp
  • Fig. 2 shows a side elevation
  • Fig. 3 shows a plan.
  • the lamp has a base member 1 of insulating material which is provided at its four corners with bolts 2 and nuts 3. The bolts 2 and nuts 3 enable the lamp to be suitably mounted for use.
  • the shielding member 7 is formed of a tube of the glass known under the trade name Pyrex, and contains a ballast resistance 8 which is connected in series with the discharge tube 6 and consists of a coiled length of resistance wire of the kind known as Nichrome.
  • Two terminal arrangements 9 and 10 are connected to the members 4 and 5 respectively by the members It and 12 respectively.
  • a reflector 13 is supported by two members 14 and 15 securely fixed in the base 1.
  • the discharge tube 6 takes the form of a conventional l25-watt tube about 5 cms. in length
  • the shielding member 7 in which the ballast resistance is contained is a tube of approximately 5 millimetres bore wound in the form of a helix having a diameter of 2 cms. with the turns spaced 1 cm. apart.
  • With a suitable ballast resistance such a lamp may be operated directly from 200250 volt mains.
  • a mercury vapor electric discharge lamp in which the discharge tube proper is shielded to a partial but significant degree, so far as external objects irradiated by the lamp are concerned, by a shielding member composed of material that is transparent to radiation of wave lengths in a wide range extending from about 3000 Angstrom units upwards and including 3650 Angstrom units, but is substantially opaque to radiation of wave lengths in a wide range below 3000 Angstrom units and including 2537 Angstrom units, said shielding member comprising a helix surrounding the discharge tube and spaced therefrom, the helix constituting a coiled tube, and a length of resistance wire in said coiled tube, the resistance wire constituting a ballast resistance for the discharge tube, and said helix surrounding the discharge tube sufiiciently closely for the heat generated in said ballast resistance to shorten materially the time taken for the discharge tube to run up to the full discharge condition when the lamp is switched on.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Pathology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Description

Oct. 29, 1957 H. G. MOLYNEUX ELECTRIC DISCHARGE LAMPS 2 Sheets-Sheet 1 Filed June 22, 1956 Oct. 29, 1957 H. G. MOLYNEUX 9 ELECTRIC DISCHARGE LAMPS Filed Juhe 22, 1956 2 Sheets-Sheet 2 United States Patent ELECTRIC DISCHARGE LAMPS Harold Grosvenor Molyneux, Ribbleton, lreston, England, assignor to Siemens Edison Swan Limited, a corporation of Great Britain Application June 22, 1956, Serial No. 593,208
Claims priority, application Great Britain July 1, 1955 1 Claim. (Cl. 315-49) The present invention relates to mercury vapour electric discharge lamps and more especially to lamps emitting ultra-violet rays for medical treatment and which are suitable for domestic use. Such lamps may be used domestically for producing a tanning effect of the human skin.
It is well known that mercury vapour electric discharge lamps emit erythemal radiation which in the shorter wave lengths (e. g. the emission at a wave length of 2537 Angstrom units) may be harmful unless special precautions are taken and this radiation is present not only during the normal operation or the lamp but also during the running up period. In the lamp of the present invention the amount of harmful radiation is reduced both in the normal operation of the lamp and during its running up period without reducing to an appreciable extent the beneficial longer wave ultra-violet radiation (e. g. the emission at a wave length of 3650 Angstrom units).
According to the present invention, there is provided a mercury vapour electric discharge lamp in which the discharge tube proper is shielded to a partial but significant degree, so far as external objects irradiated by the lamp are concerned, by a shielding member composed of material that is transparent to radiation of wave lengths in a wide range extending from about 3000 Angstrom units upwards and including 3650 Angstrom units, but is substantially opaque to radiation of wave lengths in a wide range below 3000 Angstrom units and including 2537 Angstrom units. The shielding member serves to filter out a portion of the lower wave length erythemal radiation emitted by the discharge tube. A suitable material for this shielding member is the glass known under the trade name Pyrex.
The shielding member is in the form of a helix surrounding, but spaced from, the discharge tube proper. With a shielding member of this form, the proportion of the total lower wave length erythemal radiation from the discharge tube which is rendered ineffective can readily be made to have a desired value by suitable choice of the dimensions of the member which is coiled to form the helix and of the diameter and pitch of the helix. The dimensions of the helix may suitably be such that approximately one half the surface of the discharge tube proper is obscured when the lamp is viewed from the front.
The shielding member is in the form of a helix which surrounds the discharge tube proper and which is constituted by a coiled tube, and this coiled tube has running through it a length of resistance wire constituting a ballast resistance for the discharge tube, and the helix, although spaced from the discharge tube, surrounds the discharge tube sufficiently closely for the heat generated in said ballast resistance to shorten materially the time taken for the discharge tube to run up to the full discharge condition when the lamp is switched on. The
2,811,671 Patented Oct. 29, 1957 specific material previously mentioned as being suitable for the shielding member is especially suitable, since it is such as to withstand the heat dissipated by the discharge tube proper and the ballast resistance.
By way of example, a'specific embodiment of the invention will now be described with reference to the accompanying drawings. The embodiment concerned takes the form of a mercury vapour electric discharge lamp for medical treatment, the lamp being one provided with a shielding member constituted by a coiled tube, and this coiled tube containing a ballast resistance for the discharge tube proper. Fig. 1 of the drawings shows a front elevation of the lamp, Fig. 2 shows a side elevation, and Fig. 3 shows a plan. The lamp has a base member 1 of insulating material which is provided at its four corners with bolts 2 and nuts 3. The bolts 2 and nuts 3 enable the lamp to be suitably mounted for use. Supported above the base 1, by suitable supporting and electrical conducting members 4 and 5 securely fixed in this base, and various auxiliary supporting members, are the mercury vapour discharge tube proper 6 and the shielding member 7. The shielding member 7 is formed of a tube of the glass known under the trade name Pyrex, and contains a ballast resistance 8 which is connected in series with the discharge tube 6 and consists of a coiled length of resistance wire of the kind known as Nichrome. Two terminal arrangements 9 and 10 are connected to the members 4 and 5 respectively by the members It and 12 respectively. A reflector 13 is supported by two members 14 and 15 securely fixed in the base 1. The shielding member 7, although spaced from the discharge tube 6, surrounds the latter sufliciently closely for the heat generated in the ballast resistance 8 to shorten materially the time taken for the discharge tube to run up to the full discharge condition when the lamp is switched on. The discharge tube 6 takes the form of a conventional l25-watt tube about 5 cms. in length, and the shielding member 7 in which the ballast resistance is contained is a tube of approximately 5 millimetres bore wound in the form of a helix having a diameter of 2 cms. with the turns spaced 1 cm. apart. With a suitable ballast resistance such a lamp may be operated directly from 200250 volt mains.
What I claim is:
A mercury vapor electric discharge lamp in which the discharge tube proper is shielded to a partial but significant degree, so far as external objects irradiated by the lamp are concerned, by a shielding member composed of material that is transparent to radiation of wave lengths in a wide range extending from about 3000 Angstrom units upwards and including 3650 Angstrom units, but is substantially opaque to radiation of wave lengths in a wide range below 3000 Angstrom units and including 2537 Angstrom units, said shielding member comprising a helix surrounding the discharge tube and spaced therefrom, the helix constituting a coiled tube, and a length of resistance wire in said coiled tube, the resistance wire constituting a ballast resistance for the discharge tube, and said helix surrounding the discharge tube sufiiciently closely for the heat generated in said ballast resistance to shorten materially the time taken for the discharge tube to run up to the full discharge condition when the lamp is switched on.
References Cited in the file of this patent UNITED STATES PATENTS 2,355,258 Biggs et a1. Aug. 8, 1944 2,362,384 Libby Nov. 7, 1944 2,434,980 Bilofsky Jan. 27, 1948 2,658,984 Mohn Nov. 10, 1953
US593208A 1955-07-01 1956-06-22 Electric discharge lamps Expired - Lifetime US2811671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2811671X 1955-07-01

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US2811671A true US2811671A (en) 1957-10-29

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US593208A Expired - Lifetime US2811671A (en) 1955-07-01 1956-06-22 Electric discharge lamps

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BE (1) BE549177A (en)
FR (1) FR1152003A (en)
NL (2) NL92443C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999922A (en) * 1959-07-20 1961-09-12 Alfred T Schmidt Neon flash light assembly
WO1983002233A1 (en) * 1981-12-24 1983-07-07 Mutzhas, Maximilian, F. Ultra-violet radiation apparatus for the phototherapy of dermatosis and particularly of psoriasis
US4745343A (en) * 1980-07-02 1988-05-17 Beggs William C Panoramic optical system with very sharp beam control
US20050286248A1 (en) * 2004-06-24 2005-12-29 Ming-Bi Weng Multi-level shoe-used lamp device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2355258A (en) * 1941-05-13 1944-08-08 Sylvania Electric Prod Ultraviolet fluorescent lamp
US2362384A (en) * 1942-03-30 1944-11-07 Jules L Libby Combined illuminating and germicidal lamp and method of making the same
US2434980A (en) * 1943-08-20 1948-01-27 Maxwell M Bilofsky Combination illuminating and sterilizing lamp
US2658984A (en) * 1950-06-23 1953-11-10 Heraeus Schott Quarzschmelze Optical radiator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2355258A (en) * 1941-05-13 1944-08-08 Sylvania Electric Prod Ultraviolet fluorescent lamp
US2362384A (en) * 1942-03-30 1944-11-07 Jules L Libby Combined illuminating and germicidal lamp and method of making the same
US2434980A (en) * 1943-08-20 1948-01-27 Maxwell M Bilofsky Combination illuminating and sterilizing lamp
US2658984A (en) * 1950-06-23 1953-11-10 Heraeus Schott Quarzschmelze Optical radiator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999922A (en) * 1959-07-20 1961-09-12 Alfred T Schmidt Neon flash light assembly
US4745343A (en) * 1980-07-02 1988-05-17 Beggs William C Panoramic optical system with very sharp beam control
WO1983002233A1 (en) * 1981-12-24 1983-07-07 Mutzhas, Maximilian, F. Ultra-violet radiation apparatus for the phototherapy of dermatosis and particularly of psoriasis
US20050286248A1 (en) * 2004-06-24 2005-12-29 Ming-Bi Weng Multi-level shoe-used lamp device

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Publication number Publication date
NL208504A (en)
NL92443C (en)
FR1152003A (en) 1958-02-10
BE549177A (en)

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