GB2053441A - Lamp/reflector unit - Google Patents
Lamp/reflector unit Download PDFInfo
- Publication number
- GB2053441A GB2053441A GB8020121A GB8020121A GB2053441A GB 2053441 A GB2053441 A GB 2053441A GB 8020121 A GB8020121 A GB 8020121A GB 8020121 A GB8020121 A GB 8020121A GB 2053441 A GB2053441 A GB 2053441A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamp
- reflector
- pinch
- envelope
- incandescent 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.)
- Granted
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
Abstract
A lamp/reflector unit has a concave reflector (1) with an opening (4) at its apex in which the pinch (5) of a halogen incandescent lamp (6) extends. The incandescent lamp has a filament (8) which surrounds the optical axis (9) of the reflector (1). The lamp envelope (7) of the incandescent lamp (6) is substantially spheroidal and has a maximum diameter which is larger than the width of the pinch (5), a tipped-off exhaust tube (17) being situated opposite to the pinch (5). <IMAGE>
Description
SPECIFICATION
Lamp/reflector unit
The invention relates to a lamp/reflector unit having a halogen incandescent lamp with a vacuum-tight sealed, monopinch, quartz glass lamp envelope having a tipped off exhaust tube opposite to the pinch, and a concave reflector having an opening at its apex in which the pinch of the incandescent lamp extends, which incandescent lamp has a helically wound filament which surrounds the optical axis of the reflector and which lamp is filled with an inert gas containing bromine and hydrogen.
Such a lamp/reflector unit is disclosed in United
Kingdom Patent Specification 1,143,914 and may be used for slide or sub-standard film projection.
The lamp envelope of the lamp described in said specification is manufactured from tubular glass as a result of which the diameter of the lamp envelope has a size which corresponds to the width of the pinch.
The opening at the apex of the reflector should have larger dimensions than the cross-section of the pinch of the lamp envelope so that, upon assembly of the unit, the lamp can be aligned by lateral movement so that its filament surrounds the optical axis of the reflector.
However, the opening in the reflector reduces the reflective surface area of the reflector and hence results in loss of light. If, in order to restrict this loss of light, the opening in the reflector is chosen to be smaller and, consequently, the crosssection of the pinch of the lamp envelope is also reduced by manufacturing the lamp envelope from a glass tube having a-smaller diameter, dimensions will soon be reached with which the lamp envelope blackens during operation. The opposite of the desired increased light output is then obtained.
It is an object of the invention to provide a lamp/reflector unit having an increased light output.
This object is achieved in a lamp reflector unit of the kind mentioned in the opening paragraph in that the lamp envelope of the halogen incandescent lamp is substantially spheroidal and has a larger maximum diameter than the width of the pinch.
The lamp envelope of the halogen incandescent lamp may have, for example, a spherical or ovoidal shape. Such a spheroidal lamp envelope permits of using a reflector destined for lamps having a comparatively low power, for example 100 W, for a lamp of, for example, 250 or 300 W. On the other hand the spheroidal lamp envelope makes it possible in the manufacture of the lamp to start from a glass tube having a smaller diameter than usual and to insert the pinch, which consequently is narrower, in a smaller opening of a reflector than is usual and in spite of this to assemble the lamp therein with its filament surrounding the optical axis of the reflector and preventing blackening of the lamp envelope.
The extent to which the opening in the reflector
must be larger than the cross-section of the pinch
of the halogen incandescent lamp is determined
by the accuracy with which during the
manufacture of the- incandescent lamp the
filament is positioned in the lamp envelope. When
this accuracy is high, the opening in the reflector
need be only little larger than the cross-section of
the pinch of the lamp envelope in order to enable
the lamp to be aligned.
"Quartz-glass" is to be understood to mean
herein a type ef glass having a silicon dioxide
content of at least 95% by weight.
During the manufacture of the halogen
incandescent lamp, HBr or H2 and Br2 or a
brominated hydrocarbon, for example CH2Br2, or a
mixture of these substances may be provided
therein in addition to inert gas.
The spheroidal lamp envelope can be obtained
from a glass tube by blowing the tube, if desired in
a mould, after having heated it and after having
provided a pinch seal therein.
The reflector may consist of a glass body, a
synthetic resin body or a metal body. The reflector
may reflect both visible and invisible radiation, as
in the case of a metal reflector or a metal-coated
reflector, or substantially only visible radiation, for
example in the case of a glass body or a synthetic
resin body coated with a dichroic coating.
It is to be noted that monopinch halogen lamps
having a transversely arranged filament are known from German Offenlegungsschrift 2337192. The
Offenlegungsschrift describes a method of
manufacturing said lamps in which a glass tube is
sealed at one end by a hemi-spherical head and is
constricted near said seal. An assembly of filament, current supply conductors and current
lead-through conductors is provided in the tube, the filament of which can pass the constriction
and the other parts cannot. The tube is evacuated and provided with a filling gas after which a pinch seal is made in the tube on the side of the constriction remote from the filament. A lamp is thereby obtained having a spherical lamp envelope.
The object of the method is to make an exhaust tube of the lamp envelope superfluous. The spherical shape of the lamp envelope is consequently obtained with quite a different purpose than in the unit according to the invention.
Moreover the known lamp is not suitable for use in a unit according to the invention since the filament is accommodated at right angles to the axis of the lamp envelope and hence throws a very large part of the radiated light towards the pinch of the lamp envelope where it is not reflected, at least not in a directed manner.
With an axial arrangement of the filament in the lamp envelope in a unit according to the invention on the contrary an end of the filament is directed towards the pinch and considerably less light parallel to the optical axis of the reflector is thrown on the pinch. The same applies to heat radiation.
As a result of this the pinch of the lamp in the unit according to the invention remains cooler.
Embodiments of lamp/reflector units according to the invention are shown in the accompanying drawing. In the drawing
Fig. 1 is a sectional view through the axis of a unit, and
Fig. 2 is a modified embodiment of Fig. 1.
Reflector 1 in Fig. 1 has a glass reflector body 2 the concave surface of which is coated with a reflective layer 3. At its apex the reflector 1 has an opening 4 in which the pinch 5 of a halogen incandescent lamp 6 extends. The lamp envelope 7 of the incandescent lamp 6 is substantially spherical and has a diameter which is larger than the width of the pinch 5. The envelope has a tipped-off exhaust tube 17 opposite to the pinch 5.
The filament 8 of the lamp 6 surrounds the optical axis 9 of the reflector 1. Current leadthrough conductors 10 and 11 are incorporated in the pinch 5 and are connected to a respective limb of the filament 8 and to external current conductors 12 and 13, respectively.
The filament 6 is fixed in the reflector 1 by means of cement 14. The lamp consumes 250 W at24V.
In Fig. 2 parts corresponding to those of Fig. 1 are referred to by the same reference numerals.
The reflector 1 is a metal body to which a ceramic sleeve 15 is fixed. The lamp envelope 16 of incandescent lamp 6 has the form of prolate spheroid; At 120 V the lamp consumes 300 W.
The lamps of Fig. 1 and Fig. 2 were filled with 3 bar of krypton to which 0.45% by volume of
CH2Br2 had been added.
Claims (2)
1. A lamp/reflector unit having a halogen incandescent lamp with a vacuum-tight sealed, monopinch, quartz glass envelope having a tipped off exhaust tube opposite the pinch and a concave reflector having an opening at its apex in which the pinch of the incandescent lamp extends, which incandescent lamp has a helically-wound filament which surrounds the optical axis of the reflector and is filled with an inert gas containing bromine and hydrogen, characterized in that the lamp envelope is substantially spheroidal and has a larger maximum diameter than the width of the pinch.
2. A lamp/reflector unit substantially as herein described with reference to Figure 1 or Figure 2 of the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7904881A NL7904881A (en) | 1979-06-22 | 1979-06-22 | LAMP REFLECTOR UNIT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2053441A true GB2053441A (en) | 1981-02-04 |
| GB2053441B GB2053441B (en) | 1983-03-23 |
Family
ID=19833398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8020121A Expired GB2053441B (en) | 1979-06-22 | 1980-06-19 | Lamp/reflector unit |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS568061U (en) |
| BE (1) | BE883944A (en) |
| CA (1) | CA1139822A (en) |
| DE (1) | DE8015815U1 (en) |
| FR (1) | FR2460036A1 (en) |
| GB (1) | GB2053441B (en) |
| NL (1) | NL7904881A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0409553A2 (en) * | 1989-07-20 | 1991-01-23 | General Electric Company | Mount for a lamp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3441772A (en) * | 1967-05-12 | 1969-04-29 | Gen Electric | Filament mount structure for electric lamps and manufacture thereof |
| NL7306006A (en) * | 1973-05-01 | 1974-11-05 |
-
1979
- 1979-06-22 NL NL7904881A patent/NL7904881A/en not_active Application Discontinuation
-
1980
- 1980-06-11 CA CA000353808A patent/CA1139822A/en not_active Expired
- 1980-06-14 DE DE19808015815 patent/DE8015815U1/en not_active Expired
- 1980-06-18 FR FR8013538A patent/FR2460036A1/en active Granted
- 1980-06-19 JP JP8497080U patent/JPS568061U/ja active Pending
- 1980-06-19 GB GB8020121A patent/GB2053441B/en not_active Expired
- 1980-06-20 BE BE0/201126A patent/BE883944A/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0409553A2 (en) * | 1989-07-20 | 1991-01-23 | General Electric Company | Mount for a lamp |
| EP0409553A3 (en) * | 1989-07-20 | 1992-01-08 | General Electric Company | Mount for a lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1139822A (en) | 1983-01-18 |
| BE883944A (en) | 1980-12-22 |
| DE8015815U1 (en) | 1980-12-04 |
| FR2460036B1 (en) | 1984-03-23 |
| GB2053441B (en) | 1983-03-23 |
| JPS568061U (en) | 1981-01-23 |
| NL7904881A (en) | 1980-12-24 |
| FR2460036A1 (en) | 1981-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |