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EP2166282A1 - Lampeneinheit und Reflektor - Google Patents

Lampeneinheit und Reflektor Download PDF

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Publication number
EP2166282A1
EP2166282A1 EP08164660A EP08164660A EP2166282A1 EP 2166282 A1 EP2166282 A1 EP 2166282A1 EP 08164660 A EP08164660 A EP 08164660A EP 08164660 A EP08164660 A EP 08164660A EP 2166282 A1 EP2166282 A1 EP 2166282A1
Authority
EP
European Patent Office
Prior art keywords
shaped portion
unit
seal
ring
neck shaped
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.)
Ceased
Application number
EP08164660A
Other languages
English (en)
French (fr)
Inventor
designation of the inventor has not yet been filed The
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP08164660A priority Critical patent/EP2166282A1/de
Priority to PCT/IB2009/053979 priority patent/WO2010032180A1/en
Publication of EP2166282A1 publication Critical patent/EP2166282A1/de
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0005—Fastening of light sources or lamp holders of sources having contact pins, wires or blades, e.g. pinch sealed lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it
    • H01J5/54—Means forming part of the tube or lamps for the purpose of providing electrical connection to it supported by a separate part, e.g. base
    • H01J5/58—Means for fastening the separate part to the vessel, e.g. by cement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
    • H01J61/547—Igniting arrangements, e.g. promoting ionisation for starting using an auxiliary electrode outside the vessel

Definitions

  • This invention relates to a unit of a lamp and a reflector.
  • the unit comprising:
  • Such a unit is known from EP-595412 .
  • Units of this type may be used for projection purposes, for example, film or slide projection, but also in projection TV devices. If the light generated by the lamp is to be efficiently used, it is necessary to have a clean, reflective surface that is as large as possible. In particular this applies for a most relevant part of the reflective surface which is located relatively close to the electric element, being the reflective surface close to the neck shaped portion.
  • the lamp vessel is fixed in the neck shaped portion of the reflector body with an adhesive compound, for example cement.
  • a ring is provided which narrows the opening of the neck shaped portion for a significant part at a transition area where the neck shaped portion merges into the reflective portion. Said ring is held in position by an internally narrowed portion of the neck shaped portion adjacent the transition area.
  • the unit is characterized in that the hole opening of the ceramic lamp cap is narrower than the opening in the neck shaped portion for the ceramic lamp cap to function as a seat for the ring.
  • the ring may temporarily be kept in position until the adhesive compound has hardened and does not readily flow anymore. The ring narrows a passage from the lamp cap to the neck shaped portion and thus to the reflective portion, so that the passage is blocked for a readily flowing mass like the adhesive compound.
  • the ring preferably is made from heat resistant material, for example hard glass, quartz glass, stainless steel, or, for example, heat resistant foil (Kapton).
  • a kind of automatic positioning of the ring may be realized.
  • the unit is characterized in that the first seal has a first and a second sealed portion between which a cavity is present and in that the first seal has a widening portion at the location of the cavity, the ring having only limited freedom in axial direction in between the widening portion and the ceramic cap.
  • the lamp positioned in the reflective portion, the ring practically automatically is kept in position as well.
  • the unit is characterized in that the ring is positioned adjacent the widening portion and thus that an opening in the ring through which the first seal extends, is practically closed by the widening portion.
  • the unit is characterized in that a spiral is provided around the first seal which spiral exerts resilient pressure on the ring in an axial direction towards the ceramic lamp cap due to the ring being jammed in between the ceramic lamp cap and w all of the discharge space of the lamp vessel.
  • the spiral can be made of any resilient, high temperature resistant material, i.e. high temperature means temperatures in the range of 300° to about 600° C, for example high temperature resistant metal like for example molybdenum, tungsten, kanthal, chromium, tantalum etc., or hard/quartz glass fibers.
  • the unit has a construction wherein the spiral is made of electrically conducting material and simultaneously functions as an external antenna. The antenna facilitates the (re-) igniting of the lamp. This construction offers the advantage that both the function of fixation of the ring and antenna are combined into one constructive part.
  • the spiral should be located least at the location of the cavity.
  • the unit is characterized in that the antenna is electrically connected to the second current conductor.
  • a passive serial antenna with a simple structure, which is easy to provide, and with a very reliable operation is thus realized.
  • the electric element may be an incandescent body, for example in an inert gas comprising a halogen, or a pair of electrodes in an ionizable gas.
  • the current conductor is passed from the second end portion through the reflective portion to the exterior and is connected there to a contact member.
  • the two contact members may then be at a comparatively large distance from one another, so that the risk of flash-over between these members is very small.
  • a preferred embodiment of the unit is characterized in that the hole opening in the ceramic lamp cap has a stepped profile in which a first part of the hole opening adjacent the neck shaped portion has a diameter D l which is larger than an inner diameter D r of the opening in the neck shaped portion, while a second part of the hole opening remote from the neck shaped portion has a diameter D s which is smaller than the diameter D r of the opening in the neck shaped portion.
  • the ring For autopositioning of the ring in axial direction, the ring preferably is clamped in between the stepped profile of the ceramic lamp cap and the neck shaped portion of the reflector body. Manufacturing of the unit is thus simplified.
  • an electric discharge lamp for example a high-pressure discharge lamp, for example a lamp having a filling comprising rare gas and metal halides, or a lamp having a filling of rare gas, mercury and halogen, and with a very high operational pressure, for example a pressure of approximately 200 bar or more
  • a high-pressure discharge lamp for example a lamp having a filling comprising rare gas and metal halides, or a lamp having a filling of rare gas, mercury and halogen
  • a very high operational pressure for example a pressure of approximately 200 bar or more
  • the unit of electric lamp and reflector has a reflector body 1 which is provided with a reflective portion 2 with a reflective surface 3 with an optical axis 4, and integral therewith a hollow neck-shaped portion 5 surrounding the optical axis.
  • the unit also comprises an electric lamp 10 which is provided with a light-transmitting lamp vessel 11, which is sealed in a gastight manner and has a discharge space 12 in which an electric element 13 is arranged.
  • the lamp vessel has a first 14 and a second 15 end portion with a respective seal.
  • the electric lamp 10 is fixed in the reflector body 1 by means of cement 19.
  • the neck-shaped portion 5 internally has a narrowed portion 6 which merges into the reflective surface 3.
  • a ring 58 is provided adjacent the narrowed portion 6 and around the first end portion 14 of the electric lamp 10 inside the neck-shaped portion 5 of the reflector body 1. The ring rests against the narrowed portion 6 of the neck-shaped portion 5 and surrounds the first end portion with small clearance.
  • the unit of electric lamp and reflector has a moulded reflector body 1 which is provided with a reflective portion 2 with a concave, for example, paraboloidically curved reflective surface 3 defining an optical axis 4, and integral with the reflective portion a hollow neck-shaped portion 5 surrounding the optical axis. In an alternative embodiment, however, this surface may be curved, for example, ellipsoidically.
  • the reflector body is made of glass and has a metal layer, for example an aluminum layer, serving as a mirror.
  • the reflector body may be made of, for example, glass-ceramic, ceramic, metal or synthetic resin.
  • the unit also comprises an electric lamp 10 which is provided with a light-transmitting lamp vessel 11, for example made of quartz glass, i.e. glass with an SiO2 contents of at least 95% by weight, which is sealed in a gastight manner and has a discharge space 12 in which an electric element 13, a pair of electrodes in the Figure, is arranged.
  • the lamp vessel has a first 14 and a second 15 seal, which are mutually opposed, while a respective first 16 and second current conductor 17 runs through each seal and is connected to the electric element 13 and issues from the lamp vessel 11 to the exterior.
  • the second current conductor is electrically connected to a second metal wire 37a which extends alongside the lamp vessel and through the neck shaped portion and is connected to a second electric contact 21a provided on a lamp cap 20.
  • the lamp shown is a high-pressure mercury gas discharge lamp which has a pressure of approximately 200 bar or more during operation.
  • the lamp vessel contains besides mercury a rare gas, for example argon, and bromine.
  • the electric lamp 10, which consumes a power of approximately 100 W to approximately 450 W, is fixed in the reflector body 1, by means of cement 19 in the Figure, with the first seal 14 inside the neck-shaped portion 5, the discharge space 12 inside the reflecting portion 2, and the electric element 13 on the optical axis 4.
  • the lamp cap 20 made of ceramic material in the Figure such as, for example, steatite, with a first electric contact 21 to which a current conductor 16 is connected, is fixed to the neck-shaped portion 5 of the reflector body 1, by means of cement 29.
  • the ceramic lamp cap has a hole opening 23 around the optical axis 4 which hole opening is narrower than an opening 24 in the neck shaped portion, thus a seat 25 is formed.
  • a ring 58 is present in the neck-shaped portion adjacent the ceramic lamp cap and around the first seal 14 of the electric lamp 10.
  • the ring which is made, for example, of stainless steel, rests against the seat 25 of the ceramic lamp cap and surrounds the first seal with a small clearance all around, for example, of 0.0.5 mm.
  • the ring is kept in position by spirally shaped antenna 35 which is provided around the first seal and which is electrically connected to the second current conductor.
  • the antenna is compressed in between the ring and a wall 9 of the discharge space, hence the antenna exerts an axially directed pressure on the ring towards the ceramic lamp cap and keeps it positioned there.
  • the reflector body 1 shown is closed off by a transparent plate 30.
  • the plate is fixed with cement 39 in the Figure, but could alternatively have been mounted by other means, for example a flanged metal ring.
  • the reflective portion 2 has a substantially cylindrical end portion 7 adjacent the transparent plate 30, whereby the volume of the reflective portion is increased without substantially increasing also the diameter of the unit.
  • Fig. 3 shows a first seal 14 in a neck shaped portion 5 of a reflector body 1, the seal 14 incorporating an electric conductor 16 in the form of a foil 16a in a plan view which connects a first electrode 34 to a metal wire 37 projecting to the exterior from the first seal, which first seal has a first gastight portion 14a and a second gastight portion 14b between which a gas-filled cavity 31 is present.
  • the cavity comprises at least a gaseous constituent of the filling, for example, the cavity comprises argon.
  • the first seal has a widening portion 41 around which an external antenna 35 is provided, the antenna being squeezed in between a wall 9 of the discharge space 12 and a ring 58.
  • the first seal 14 constitutes a collapsed seal, but alternatively could be a pinched seal.
  • the foil 16a is a Mo-strip having knife edges.
  • the metal wire 37 is secured via a wire part 16d of the current conductor 16 to one end 16b of the strip 16a, for example, by welding and projects to the exterior from the seal and from the discharge vessel.
  • the electrode rod 34 is secured via the strip 16a to a further end 16c of said strip 16a. In the operating condition of the lamp, a discharge extends between the electrodes. In the embodiment described, a very reliable passive antenna is thus realized in an extremely simple manner.
  • a ring 58 is provided around the first seal, the ring 58 rests on a ceramic lamp cap 20 which is fixed at a rear side 36 of the neck shaped portion 5 of the reflector body 1.
  • the ring 58 practically closes off an opening 38 in the neck shaped portion and counteracts the flow of cement 19 into the neck shaped portion and thus onto the reflective surface 3.
  • the antenna 35 simultaneously functions as a metal spring which exerts an axially directed pressure on the ring 58 towards the ceramic lamp cap 20, thus being fixed and kept in position there.
  • the ring 58 surrounds the first seal of the lamp vessel adjacent the widening portion 41 of the first seal 14, thus a clearance 42 between the opening in the ring and the first seal of the lamp vessel is practically closed off and flow of cement 19 through said opening in the ring is prevented.
  • the ceramic lamp cap has only one electrical contact (not shown), as the second metal wire (ref. nr. 37a in Fig.2 ) does not extend through the neck shaped portion but is lead elsewhere to the exterior via the reflective portion 2 (not shown).
  • Fig. 4 shows a similar detail as shown in Fig. 3 (not to scale) with all technical features being the same as shown in Fig. 3 except for the construction of the ceramic lamp cap 20.
  • the ceramic lamp cap 20 is provided with a stepped profile 61, indicated by the circle.
  • the ceramic lamp cap has a first part 62 of the hole opening 23 adjacent the neck shaped portion 5 of the reflector body 1, and a second part 63 of the hole opening distant from said neck shaped portion.
  • the first part 62 has an inner diameter D l which is larger than an inner diameter D r of the neck shaped portion of the reflector body.
  • the second part 63 has an inner diameter D s which is smaller than the inner diameter D r of the neck shaped portion of the reflector body.
  • the ring 58 fits with ample spacing within the first part 62 to enable adjustment transversal to the optical axis 4 necessary for alignment of the lamp vessel 11 in the reflective portion 2 of the reflector body, but the ring is too large to fit in the second part 63.
  • the ring 58 is pressed against the stepped profile 61 by the antenna 35.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP08164660A 2008-09-19 2008-09-19 Lampeneinheit und Reflektor Ceased EP2166282A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08164660A EP2166282A1 (de) 2008-09-19 2008-09-19 Lampeneinheit und Reflektor
PCT/IB2009/053979 WO2010032180A1 (en) 2008-09-19 2009-09-11 Lamp and reflector unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08164660A EP2166282A1 (de) 2008-09-19 2008-09-19 Lampeneinheit und Reflektor

Publications (1)

Publication Number Publication Date
EP2166282A1 true EP2166282A1 (de) 2010-03-24

Family

ID=40044053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08164660A Ceased EP2166282A1 (de) 2008-09-19 2008-09-19 Lampeneinheit und Reflektor

Country Status (2)

Country Link
EP (1) EP2166282A1 (de)
WO (1) WO2010032180A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2407826A1 (de) 2010-07-08 2012-01-18 Koninklijke Philips Electronics N.V. Projektionssystem mit einer Festkörperlichtquelle und lumineszierendem Material
EP2407825A1 (de) 2010-07-08 2012-01-18 Koninklijke Philips Electronics N.V. Projektionssystem mit einer Festkörperlichtquelle und lumineszierendem Material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595412A1 (de) 1992-10-30 1994-05-04 Koninklijke Philips Electronics N.V. Lampe/reflektor Einheit
EP0762459A2 (de) * 1995-08-30 1997-03-12 Ushiodenki Kabushiki Kaisha Lampenvorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595412A1 (de) 1992-10-30 1994-05-04 Koninklijke Philips Electronics N.V. Lampe/reflektor Einheit
EP0762459A2 (de) * 1995-08-30 1997-03-12 Ushiodenki Kabushiki Kaisha Lampenvorrichtung

Also Published As

Publication number Publication date
WO2010032180A1 (en) 2010-03-25

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