US2116722A - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
US2116722A
US2116722A US43757A US4375735A US2116722A US 2116722 A US2116722 A US 2116722A US 43757 A US43757 A US 43757A US 4375735 A US4375735 A US 4375735A US 2116722 A US2116722 A US 2116722A
Authority
US
United States
Prior art keywords
indentation
filament
plane
light
electric lamp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US43757A
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English (en)
Inventor
Downer George Victor
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US2116722A publication Critical patent/US2116722A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels

Definitions

  • This invention relates to electric lamps and its object is to provide a lamp in which excessive intensity of the light in certain directions is minimized with a view to improving the general distribution of the light.
  • Another object is to increase the light given out in certain directions where it is most useful.
  • the invention consists in an electric lamp in which the wall of the bulb is indented'towards the luminous element in an area where the radiation is stronger than necessary for optimum distribution, the sides of the indentation being formed at such an angle as to reduce the amount of light passing directly therethrough by reflecting some of it in other and more useful directions.
  • the invention is particularly applicable to the type of electric lamp in which the luminous element consists of a filament which is bent or curved in one plane, for example, in the form of a part circle or polygon in a horizontal plane, in which case more light is radiated in the plane of the filament than in other directions, and a bright line or band is liable to be thrown on the walls or on adjacent objects in the plane of the filament, and in the case of a horizontal filament most light is radiated in the least useful direction, i. e. in a horizontal plane.
  • the excess radiation in the plane of the filament is reduced in accordance with the invention by forming the indentation partly or wholly around the bulb adjacent the filament and in or near the plane thereof, whereby some of the horizontal radiation is reflected upwards and/or downwards by the walls of the indentation.
  • FIG. 1 shows partly in section an electric lamp in accordance with the invention
  • Fig. 2 shows a modification
  • the glass bulb I of the lamp shown in Fig. 1 is formed with an indentation 4 opposite and surrounding the filament 3, the apex of the indentation being approximately in the plane of the filament. Owing to the acute angle of incidence of the light on the sides of the indentation 4 a considerable proportion of the light will be reflected upwardly or downwardly as shown by the dotted lines and considerably less light will be directly transmitted horizontally, thus reducing the illumination in and near the plane of the filament and increasing the illumination of the working plane below the lamp and of the ceiling above the lamp.
  • a diffusing band 2 is formed on the glass wall of the bulb in the area of indentation, whereby the amount of light directly transmitted through the indented part of the bulb is further reduced by absorption and the amount reflected upwardly or downwardly from the sides of the indentation 4 is increased by the relative opacity of the glass.
  • the diffusing band 2 is preferably, but not necessarily, graduated at its edges as shown, to avoid any sudden changes in the intensity of the illumination of different areas.
  • the apex of indentation need not be exactly in the plane of the filament.
  • the deflecting indentation might be formed with its apex slightly above or behind the plane of the filament.
  • the upper and lower sides of the indentation might be formed at different angles to the plane of the filament.
  • An electric lamp having a luminous element and a transparent bulb enclosing said luminous element, said bulb being formed with an indentation of substantially V-shape in cross section longitudinally of the bulb, the apex of the inner face of said indentation being so positioned with respect to said luminous element as to be located in the zone of the greatest intensity of illumination from said luminous element when the same is rendered luminous by an electric current.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US43757A 1934-10-08 1935-10-05 Electric lamp Expired - Lifetime US2116722A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27540/33A GB427254A (en) 1934-10-08 1934-10-08 Improvements in or relating to electric lamps

Publications (1)

Publication Number Publication Date
US2116722A true US2116722A (en) 1938-05-10

Family

ID=10261240

Family Applications (1)

Application Number Title Priority Date Filing Date
US43757A Expired - Lifetime US2116722A (en) 1934-10-08 1935-10-05 Electric lamp

Country Status (6)

Country Link
US (1) US2116722A (enrdf_load_stackoverflow)
BE (1) BE411645A (enrdf_load_stackoverflow)
DE (1) DE662243C (enrdf_load_stackoverflow)
FR (1) FR796006A (enrdf_load_stackoverflow)
GB (1) GB427254A (enrdf_load_stackoverflow)
NL (1) NL43150C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD313281S (en) 1987-12-22 1990-12-25 U.S. Philips Corporation Lamp
US20060244383A1 (en) * 2005-04-28 2006-11-02 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Electric lamp having retaining pinches for the luminous element

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29915979U1 (de) 1999-09-10 1999-12-16 Czech, Andreas, 38102 Braunschweig Lampe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD313281S (en) 1987-12-22 1990-12-25 U.S. Philips Corporation Lamp
US20060244383A1 (en) * 2005-04-28 2006-11-02 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh Electric lamp having retaining pinches for the luminous element
US7548025B2 (en) * 2005-04-28 2009-06-16 Osram Gesellschaft Mit Beschraenkter Haftung Electric lamp having retaining pinches for the luminous element

Also Published As

Publication number Publication date
DE662243C (de) 1938-07-08
BE411645A (enrdf_load_stackoverflow)
GB427254A (en) 1935-04-18
NL43150C (enrdf_load_stackoverflow)
FR796006A (fr) 1936-03-27

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