GB2034016A - Reflector Lamp - Google Patents
Reflector Lamp Download PDFInfo
- Publication number
- GB2034016A GB2034016A GB7933316A GB7933316A GB2034016A GB 2034016 A GB2034016 A GB 2034016A GB 7933316 A GB7933316 A GB 7933316A GB 7933316 A GB7933316 A GB 7933316A GB 2034016 A GB2034016 A GB 2034016A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- lamp
- envelope
- light source
- pinch seal
- 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
- 238000010891 electric arc Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 5
- 229910052736 halogen Inorganic materials 0.000 abstract description 2
- 229910052721 tungsten Inorganic materials 0.000 abstract description 2
- 239000010937 tungsten Substances 0.000 abstract description 2
- -1 tungsten halogen Chemical class 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910001507 metal halide Inorganic materials 0.000 description 1
- 150000005309 metal halides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005401 pressed glass Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/34—Double-wall vessels or containers
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
A reflector lamp in which a lamp envelope 7 containing a light source, in particular a short arc discharge source, is mounted in an ellipsoidal reflector 3 with the light source at or near the primary focus of the reflector. Such lamps are used in, for example, photographic and optical equipment where short focus reflectors are sometimes required, giving problems in positioning the light source close to the reflector surface. The invention provides for such a reflector lamp where the envelope 7 has lead wires 8, 9 sealed through a pinch seal 10 at one end of the envelope only and is positioned so that its pinch seal is remote from the reflector surface. The light source may alternatively be a tungsten halogen lamp. <IMAGE>
Description
SPECIFICATION
Reflector Lamp
The present invention relates to reflector lamps in which a lamp envelope containing a light source is mounted in a reflector.
Such reflector lamps are used for a variety of purposes and in some circumstances it is necessary that the light source be positioned at or near the primary focus of an ellipsoidal reflector, for example in certain optical and photographic equipment. ln order to reduce the size of such equipment while still retaining good optical radiation collection, it is necessary to bring the secondary focus closer to the reflector by altering the shape of the reflector. The resulting "short focus" reflector has its primary focus closer to the reflector surface which creates a problem in mounting the envelope containing the light source.
This problem is particularly difficult with short arc gap discharge sources of high loading since most of the envelopes used are tubular with a lead wire at each end (double ended construction) and can only be positioned with the arc gap at the primary focus of a short focus ellipsoidal reflector by cutting slots or holes in the reflector. This restricts the operation of the lamp since it is not possible to seal the reflector and surround the lamp with a vacuum or an inert gas to reduce heat loss and protect the lamp seals.The same problems would apply to other light sources using envelopes of double ended construction, and conventional mounting of light sources which have envelopes with the lead wires sealed through a single pinch seal at one end of the envelope only also gives the same problems when the relatively large pinch seal prevents the arc gawp from being positioned near enough to the reflector.
According to the present invention a reflector lamp comprises an ellipsoidal reflector which has mounted therein a lamp envelope containing a light source, the envelope having lead wires sealed through a pinch seal at one end of the envelope only and being position so that its pinch seal is remote from the reflector surface and the light source is at or near the primary focus of the reflector.
Preferably the light source is a short arc discharge source.
A reflector lamp constructed in accordance with the present invention will now be described by way of example and with reference to the accompanying drawing which shows a cross section through the lamp.
The lamp comprises a sealed outer envelope 1 and a short arc discharge lamp 2 mounted within the outer envelope.
The outer envelope 1 is formed by a pressed glass reflector 3 having a quarter-wavelength multilayer dichroic coating on its inner surface, and a front glass plate 4 bonded to the reflector.
The dichoic coating is chosen to give a high reflectance for radiation in the ultra-violet A region of the spectrum (-315 no 400 nm) and a high transmittance for infra-red radiation. A conventional screw base 5 is bonded to the outside of the reflector 3 and contact regions on the base are connected to support wires 6 sealed through the end wall of the reflector. The outer envelope contains either a vacuum or an inert gas filling to reduce heat losses from the discharge lamp 2 and protect the lamp seals from oxidation.
The discharge lamp 2 has an approximately spherical discharge envelope 7 containing two electrodes and a filling capable of supporting a discharge having an enhanced output in the ultraviolet A region of the spectrum. The electrodes are arranged in-the envelope 7 such that the discharge arc is transverse to the optical axis of the-reflector 3 and passes through the primary focus of the reflector. The electrodes may alternatively be arranged so that the discharge arc is aligned along the optical axis of the reflector.
Lead wires 8, 9 for the electrodes are sealed through a pinch seal region of the discharge lamp, both lead wires being sealed through the same pinch seal 10 extending on one side only of the lamp 2. The discharge lamp 2 is positioned in the outer envelope with its pinch seal 10 extending away from the reflector surface towards the front plate 4 and the lead wires 8, 9 are connected to the inner ends of the support wires 6 to electrically connect the electrodes to the base contact regions.
The support wires 6 are sufficiently stiff to provide a supporting framework for the lamp 2, the lamp pinch seal being gripped between two non-conducting strips 11 secured at each end to the support wires 6.
The lamp 2 may alternatively be supported by a framework separate from the electrical connections between the lamp and the base contact regions.
In use, radiation from the discharge arc which is incident on the reflector is reflected with an enhanced proportion of ultra-violet A and a reduced proportion of infra-red thus giving a cool beam of high ultra-violet A intensity which is particularly suitable for photographic systems, e.g. photographic enlargers. The pinch seal 10 and support framework obstructs some of the forward emitted direct radiation which is higher in infra-red than the reflected radiation, and thus minimises the infra-red component in the beam.
There is little obstruction of the reflected radiation by the pinch seal since the seal is of small crosssection compared to the reflector.
To provide a beam high in ultra-violet A radiation the discharge envelope contains a metal halide filling with Mg and an amount of Hg to provide an enhanced output in the ultra-violet A region. A suitable filling comprises the following quantities per cc of arc tube volume:
Hg 13.3 mg
Hgl 2.6 mg
Mg 0.2 mg
Whilst this filling gives a beam particularly suitable for photographic systems, other fillings could be used to give other spectral distributions in the beam with suitable choice of dichroic coating on the reflector.
The lamp has been described with particular reference to a discharge light source but the support arrangement can easily be adapted to other sources contained in envelopes having the lead wires sealed through a single pinch seal at one end of the envelope only, e.g. tungsten halogen lamps.
Claims (8)
1. A reflector lamp comprising an ellipsoidal reflector which has mounted therein a lamp envelope containing a light source, the envelope having lead wires sealed through a pinch seal at one end of the envelope only and being positioned so that its pinch seal is remote from the reflector surface and the light source is at or near the primary focus of the reflector.
2. A reflector lamp according to Claim 1, wherein the reflector and lamp envelope are enclosed with in a sealed outer envelope.
3. A reflector lamp according to Claim 2, wherein the outer envelope contains either a vacuum or an inert gas filling.
4. A reflector lamp according to Claim 2 or
Claim 3, wherein the reflector is formed by a dichroic coating on part of the inner surface of the outer envelope.
5. A reflector lamp according to any preceding claim, wherein the lamp envelope is supported by a support framework which grips it at the pinch seal and is secured to the reflector.
6. A reflector lamp according to Claim 5, wherein at least part of the support framework is sealed through the reflector and connects the lead wires to external electrical contacts.
7. A reflector lamp according to any preceding claim, wherein the light source is a short arc discharge source.
8. A reflector lamp substantially as herein described and with reference to the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7933316A GB2034016B (en) | 1978-10-16 | 1979-09-26 | Reflector lamp |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7840699 | 1978-10-16 | ||
| GB7933316A GB2034016B (en) | 1978-10-16 | 1979-09-26 | Reflector lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2034016A true GB2034016A (en) | 1980-05-29 |
| GB2034016B GB2034016B (en) | 1982-08-11 |
Family
ID=26269210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7933316A Expired GB2034016B (en) | 1978-10-16 | 1979-09-26 | Reflector lamp |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2034016B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758759A (en) * | 1986-11-06 | 1988-07-19 | Gte Products Corporation | Lamp with light-source capsule support members having equal thermal conductivity |
| EP0419084A2 (en) * | 1989-09-22 | 1991-03-27 | TUNGSRAM Részvénytársaság | Lamp with a reflector envelope |
| US5176441A (en) * | 1989-09-22 | 1993-01-05 | Tungsram Reszvenytarsasag | Lamp with a reflector envelope |
| DE19608042A1 (en) * | 1996-03-02 | 1997-09-04 | Imab Stiftung | Simple UV filter lamp |
| DE19915118A1 (en) * | 1999-04-01 | 2000-10-12 | Cosmedico Licht Gmbh | Gas discharge lamp configuration for tanning skin includes filtering reflector and enriched gas |
| USD871953S1 (en) | 2019-05-09 | 2020-01-07 | Fitbit, Inc. | Watch band with a reflective strip |
| USD895615S1 (en) | 2018-11-06 | 2020-09-08 | Fitbit, Inc. | Body of a smart watch |
| USD910011S1 (en) | 2019-04-25 | 2021-02-09 | Fitbit, Inc. | Smart watch |
-
1979
- 1979-09-26 GB GB7933316A patent/GB2034016B/en not_active Expired
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758759A (en) * | 1986-11-06 | 1988-07-19 | Gte Products Corporation | Lamp with light-source capsule support members having equal thermal conductivity |
| EP0419084A2 (en) * | 1989-09-22 | 1991-03-27 | TUNGSRAM Részvénytársaság | Lamp with a reflector envelope |
| EP0419084A3 (en) * | 1989-09-22 | 1991-08-07 | Tungsram Reszvenytarsasag | Lamp with a reflector envelope |
| US5176441A (en) * | 1989-09-22 | 1993-01-05 | Tungsram Reszvenytarsasag | Lamp with a reflector envelope |
| DE19608042A1 (en) * | 1996-03-02 | 1997-09-04 | Imab Stiftung | Simple UV filter lamp |
| DE19915118A1 (en) * | 1999-04-01 | 2000-10-12 | Cosmedico Licht Gmbh | Gas discharge lamp configuration for tanning skin includes filtering reflector and enriched gas |
| USD895615S1 (en) | 2018-11-06 | 2020-09-08 | Fitbit, Inc. | Body of a smart watch |
| USD895614S1 (en) | 2018-11-06 | 2020-09-08 | Fitbit, Inc. | Body of a smart watch |
| USD910617S1 (en) | 2018-11-06 | 2021-02-16 | Firbit, Inc. | Smart watch |
| USD900808S1 (en) | 2018-11-06 | 2020-11-03 | Fitbit, Inc. | Body of a smart watch |
| USD910012S1 (en) | 2019-04-25 | 2021-02-09 | Fitbit, Inc. | Smart watch |
| USD910011S1 (en) | 2019-04-25 | 2021-02-09 | Fitbit, Inc. | Smart watch |
| USD871953S1 (en) | 2019-05-09 | 2020-01-07 | Fitbit, Inc. | Watch band with a reflective strip |
| USD896119S1 (en) | 2019-05-09 | 2020-09-15 | Fitbit, Inc. | Watch bands with a reflective strip |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2034016B (en) | 1982-08-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920926 |