EP0136684B1 - Projection lamp unit - Google Patents

Projection lamp unit Download PDF

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Publication number
EP0136684B1
EP0136684B1 EP19840111688 EP84111688A EP0136684B1 EP 0136684 B1 EP0136684 B1 EP 0136684B1 EP 19840111688 EP19840111688 EP 19840111688 EP 84111688 A EP84111688 A EP 84111688A EP 0136684 B1 EP0136684 B1 EP 0136684B1
Authority
EP
European Patent Office
Prior art keywords
reflector
lamp unit
projection lamp
facets
unit according
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
Application number
EP19840111688
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0136684A3 (en
EP0136684A2 (en
Inventor
Lawrence R. Fraley
Arnold E. Westlund, Jr.
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.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0136684A2 publication Critical patent/EP0136684A2/en
Publication of EP0136684A3 publication Critical patent/EP0136684A3/en
Application granted granted Critical
Publication of EP0136684B1 publication Critical patent/EP0136684B1/en
Expired 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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures

Definitions

  • the invention relates to incandescent lamp and glass reflector combinations, particularly for use in projection systems such as 16 mm. movie and slide projectors.
  • the invention has particular application in an overhead projector system.
  • a projection lamp unit which forms part of a projection system such as mentioned above generally includes a preformed glass reflector and projection lamp (e.g. tungsten halogen).
  • the reflector generally has an elliptical surface of revolution with the lamp filament at or near the focal point for concentrating a beam of light through the system's various elements (e.g., film gate and associated lens). Examples of such lamp units are found in US-A-3,789,212 and US-A-3,761,170. In some units, the reflector surface is smooth and highly polished (specular) so as to maximize the controlled energy directed through the system.
  • the aforementioned US-A-3,761,170 and US-A-4,392,189 illustrate such a smooth surfaced reflector.
  • the all-faceted reflector improves the uniformity of the beam pattern in comparison to all-specular surfaced reflectors, there tends to be a significant light loss using such a surface.
  • an object of the present invention to provide an improved projection lamp unit including a reflector in which optical energy output and beam pattern uniformity are optimized.
  • the reflector of this invention in comparison with an all-faceted reflector, provides improved total optical output and smaller corner-to-corner differential, which in turn implies improved light distribution at the edge of the beam pattern on the screen receiving the image.
  • the reflecting surface is demarcated into alternately disposed radially extending regions. These surface regions include a plurality (e.g., four or five) of specular stripes in combination with spaced regions of facets.
  • the combination of stripes and faceted regions provides for optimization of total optical output and beam pattern uniformity. With particular comparison to the output of an all-faceted reflector, there has been found to be both enhanced total light output in addition to smaller corner-to-corner differential, thereby resulting in better illumination of the subject screen.
  • the Claims 2-9 set out particular embodiments of the invention.
  • Unit 10 is particularly adapted for use within a projection system such as a slide or 16 mm. movie projector. Accordingly, projection lamp unit 10 would be located within a suitable socket/holder assembly (not shown) such as described and shown in the aforementioned US-A-3,789,212 or US-A-3,761,170.
  • Unit 10 includes a pressed (molded) glass reflector 11 and an incandescent projection lamp 13 (in phantom in Figs. 1 and 2) adapted to be located within reflector 11 such as is clearly illustrated in Fig. 3.
  • the projection lamp 13 is preferably of the tungsten/halogen type (such as one listed under ANSI code ELH) and produced and sold by the assignee of the present invention. This particular lamp produces 300W (watts), is operable at normal line voltages, and possesses an average life of 35 hours.
  • the envelope portion 15 of lamp 13 preferably includes a CC8 (CC means coiled coil, 8 is a GTE-code) tungsten filament 17 (Fig. 3) which is electrically connected within the lamp's press sealed end 19 (adjacent to envelope 15) to a pair of contact pins 21 which project from the lamp envelope.
  • Filament 17 also may include a parallel (to the coil) support wire 24 which assists in maintaining (supporting) the coiled portion of the filament in the position shown within the lamp's envelope.
  • Fig. 3 also illustrates the molybdenum foil strips 22 which conductively interconnect the filament 17 with the contact pins 21. The lamp 13 is activated when pins 21 are connected to a suitable socket component (not shown) and the corresponding projection system placed in operation.
  • the preferred filament used in the projection unit 10 is filament type CC8.
  • the projection unit may also employ other types of lamps described hereinafter, some of which may utilize the filament type CC6.
  • the coiled coil portion 24' of the CC8 filament structure extends along the optical axis (OA-OA) of the reflector while the coiled coil portion of a type CC6 filament structure extends perpendicular to the optical axis of the reflector. Both coiled coil portions are preferably located (centered) at the reflector's focal point to assure optimum output.
  • ENH lamps operate at normal line voltages and are capable of producing 250 W over an average life of 175 hours.
  • ENX'Iamps typically produce 360 W, operate at 82 volts, and are rated as having an average life of 75 hours.
  • Both ENH and ENX type lamps utilize a CC8 filament structure.
  • Still other lamps for use in unit 10 include those producing from about 80 to 150 Wand operable at the relatively low voltage ranges of between about 10 and about 24 V (volts) (sometimes even lower).
  • Lamps of this type typically use C6 (C means coil) or CC6 filaments and have an average operating life of between 25 and 1000 hours. These latter defined lamps are listed under such ANSI code designations as EJA, EMJ, EJN, EJL, DED and ELC.
  • the contact pins 21 typically employed in tungsten halogen lamps of the variety described above are of molybdenum or similar conductive material. Lamp 13 is retained in position in reflector 11 using a suitable cement 25 (e.g., Sauereisan) known in the industry.
  • the reflector 11 is preferably made of hardglass (e.g., boro-silicate), and includes a forward (or front) concave reflecting portion 23 and a hollow rear neck portion 26 adjacent thereto.
  • the reflecting portion 23 is depicted in the drawing as having a peripheral rim portion 27.
  • Reflecting portion 23 is preferably elliptical or parabolic in configuration and has a concave reflecting surface 30 that is formed with alternately disposed radially extending regions including a plurality of spaced, specular stripes 32 which are disposed in the starlike pattern illustrated clearly in Fig. 2.
  • the smooth, mirrorlike specular stripes 32 have defined therebetween spaced regions 34 each containing several diffusing facets 35.
  • the specular stripes 32 are smooth and highly polished.
  • the facets 35 of each region may be in the form illustrated in the aforementioned US-A-4,021,659. Accordingly, each facet 35 may be substantially flat or be curved convexly.
  • each specular stripe 32 is similar to the width of each radial row 31 of facets (a total of five such rows occupying each facet region 34).
  • the preferred number of facets in each region is between about fifty and eighty, and, as illustrated, the facet sizes in each radial row, being tapered, are progressively larger as they approach the forwardmost edge (facing the viewer in Fig. 2) of the glass reflector. Widthwise in degrees, each specular stripe 32 occupies about twelve degrees, as does each radial row 31 of facets 35.
  • the internal diameter of the reflector's front opening in one example of the invention, was about 4.25 cm (1.68 inch). Accordingly, the width of each row 31 and stripe 32 at this edge was about 0.445 cm (0.176 inch).
  • the concave reflecting surface 30 of reflecting portion 23 may be provided with a dichroic mirror coating (not shown) on its interior surface to permit much of the heat generated by lamp 13 to pass therethrough while still reflecting the lamp's visible light output in a forward direction A. Such coatings are known in the art and typically can withstand temperatures of 500°C with no resultant shift in characteristics.
  • UL is meant the percentage of light measured at the upper left of the screen
  • LL means lower left, etc.
  • average differential is meant the average of the maximum difference in corner percentages (worst case scenerario) for each unit. For example, if the maximum percentage difference between any two corners in one unit was 4.0, this unit would be assigned said value.
  • a low value, as indicated here, is deemed extremely significant and highly desired in the industry to assure output uniformity. All such readings were performed using photometric test kits known in the art. Surprisingly, these results were possible without specific placement of the CC8 filament structure relative to the stripe/facet locations. That is, these positive results were attained regardless of location of the filament's coil (24') and support wire (24) relative to the stripe/facet orientation.
  • the total light output of the reflector of the present invention is greater than that of an all-faceted reflector such as depicted in US-A-4,021,659, the corner percentage averages for both groups are substantially the same, despite use of the invention's unique specular stripes, and the average corner differential of the reflector of the present invention is substantially smaller than that of the compared all-faceted reflector.
  • This value implies sound, even light distribution at the edge portion of the beam pattern on the distant screen.
  • a 3M (trade mark) model 213 overhead projector was used to perform the white screen test. This test was made on a comparison basis between the reflector of the present invention and the above referenced all-faceted reflector. There was no perceivably observed difference in appearance of light pattern between the different lamps. The photometric display indicated that the lamps of both types clearly satisfied industry specifications. However, the lamp of the present invention possessed highly desired greater brightness, as indicated above.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Projection Apparatus (AREA)
  • Lenses (AREA)
EP19840111688 1983-10-03 1984-09-29 Projection lamp unit Expired EP0136684B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53872183A 1983-10-03 1983-10-03
US538721 1983-10-03

Publications (3)

Publication Number Publication Date
EP0136684A2 EP0136684A2 (en) 1985-04-10
EP0136684A3 EP0136684A3 (en) 1986-01-22
EP0136684B1 true EP0136684B1 (en) 1987-08-19

Family

ID=24148136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840111688 Expired EP0136684B1 (en) 1983-10-03 1984-09-29 Projection lamp unit

Country Status (4)

Country Link
EP (1) EP0136684B1 (ja)
JP (1) JPS6097543A (ja)
CA (1) CA1245201A (ja)
DE (1) DE3465509D1 (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62168560U (ja) * 1986-03-25 1987-10-26
NL192273C (nl) * 1986-12-04 1997-04-03 Philips Electronics Nv Verlichtingsarmatuur.
JPS63228501A (ja) * 1987-03-17 1988-09-22 東芝ライテック株式会社 照明器具
FR2644933A1 (fr) * 1989-03-24 1990-09-28 Gen Electric Lampe monobloc a reflecteur
JPH0739709Y2 (ja) * 1990-06-26 1995-09-13 株式会社三陽電機製作所 車両用照明器具の反射板
JPH04229949A (ja) * 1990-07-02 1992-08-19 General Electric Co <Ge> 多面反射型ランプ
EP0479365A1 (en) * 1990-10-01 1992-04-08 Koninklijke Philips Electronics N.V. Illumination device and capped lamp/reflector unit for use therein
JPH11297112A (ja) 1998-04-15 1999-10-29 Matsushita Electron Corp 反射鏡付き管球
US8858039B2 (en) 2009-01-20 2014-10-14 Panasonic Corporation Illuminating apparatus
CN102588794A (zh) * 2012-02-29 2012-07-18 宁波爱珂照明科技有限公司 一种led聚光灯
CN103851362A (zh) * 2012-11-30 2014-06-11 海洋王（东莞）照明科技有限公司 灯具及其反射器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021659A (en) * 1975-10-30 1977-05-03 General Electric Company Projector lamp reflector
US4035631A (en) * 1975-12-15 1977-07-12 General Electric Company Projector lamp reflector

Also Published As

Publication number Publication date
CA1245201A (en) 1988-11-22
EP0136684A3 (en) 1986-01-22
DE3465509D1 (en) 1987-09-24
EP0136684A2 (en) 1985-04-10
JPS6097543A (ja) 1985-05-31

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