Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS1256522 A
Publication typeGrant
Publication dateFeb 19, 1918
Filing dateJul 15, 1915
Priority dateJul 15, 1915
Publication numberUS 1256522 A, US 1256522A, US-A-1256522, US1256522 A, US1256522A
InventorsAlvyn L Croxton
Original AssigneeAlvyn L Croxton
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Reflecting apparatus.
US 1256522 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)




Patented Feb.19,191&




Specification 01' Letters Patent.

Patented Feb. 19, 1918.

Application filed July 15, 1915. Serial N 0. 39,951.

To all whom it may concern Be it known that I, ALVYN L. CRoxToN, citizen of the United States, residing at Bremerton, in the county of Kitsap and State of Washington, have invented certain new and useful Improvements in Reflecting Apparatus, of which the following is a spec1- fication.

The present invention relates to reflectmg apparatus for kinetoscopes and for other analogous purposes.

The object of the invention is to provlde an efficient apparatus adapted to reflect practically the entire amount of light ra s einanating from a lamp into the re ract1ng lenses. At the present time in movmg picture projection apparatus an electric arc lamp is employed from which but little more than the direct pencils of light to the lenses are utilized and thrown upon the screen, with the result that an intensely strong lamp must be employed with relatively large consumption of current and high cost of operation. In my invention I employ a lamp of much lower lighting efficiency and consumption of current, but by inclosing such lamp in a substantially globular casing having light reflecting and directing interior surfaces, I am able to concentrate at least an equal intensitg of light upon the lenses from a lamp unit and economy in large measure.

The invention consists in the novel construction of a light reflecting casing and the combination and adaptation therewith of devices for its ventilation, as ,will be full explained in the following specification, lllllS- trated in the accompanying drawings, and finally set forth in the appended claims.

In said drawings, Figure 1 is a longitudinal sectionalview of apparatus embodying my invention. Fig. 2 is a transverse sectional view through 2-2 of Fig. 1. Figs. 3 and 4 are respectively views in side elevation and top plan of a detail of the invention drawn to an' enlarged scale.

eferring to said views, the reference numeral 1 designates an" electric lamp of any suitable form, that type known as nitrogen lamps being now considered to be desirable in connection with my im rovements. Said lamp is shown and may e provided with 'a socket 2 which is fixedly positioned within a tubular sleeve 3 arranged axially of a reflector-casing 5. Said casing 5 is of concavo-convex form, its converging reflectaving the advantages of portabilityv ing surface 5 extending in forward directions with said lamp in its axial line and is desirably of elliptic interior configuration having its foci in the center face of the re fracting lenses hereinafter described and the center of light C which is in the transverse plane of the perimetrical extremity 6 of said reflector 5.

vDetachably secured to said reflector casing 5 is a reverse hemispherical reflector 7 of concavo-convex form which has for the center of its converging interior reflecting surface 7 the center of light 0 of said lamp. Said reflector 7 is arranged at its rearward edges 8 to overlap the forward edges 6 of said reflector 5 and -is spaced outwardly therefrom afi'ording an annular space 10 therebetween. Spaced at equi-distant intervals as at 90 degrees apart about said reflector 5 are radially disposed studs 11 each having a reduced portion 12 near their outer extremitiesand a head 13. The reflector 7 is provided with correspondingly spaced L- shaped slots 15 in which said reduced portion 12 of the respective studs are received to secure the reflectors 5 and 7 together. "One or more spring clips 16 are adapted to overlap said slots and by engagement with the head 13 of said stud retain the latter in detachable locked condition.

Arranged axially of said reflector 7 and in alinement with said lamp and the socket 3 is an opening into which is secured a tubular shell 17 into which a lens casing 18 is telescopically fitted for adjustment toward or away from said lamp. Said casing 18 is provided with plano-convex lenses 20 and 21 adapted to direct the pencils of light reflected thereintoin parallel rays. Surrounding that portion of said shell 17 directly adacent saidlenses is an annular cooling chamber 22 into which a current of cooling air is directly blown through inlet pipe 23 to which a flexible or other conduit (not shown) may be communicatively connected through which a current of air is blown by a fan or blower (not shown), and which is exhausted from said chamber 22 into the lamp compartment 23 through aperture 25 in said reflector 7 arranged in spaced rela tion about said lens casing 18. Such air currents are thus circulated about the lens casing 18 and then are directed toward the lamp carrying away from the lenses any excess heat received from said lamp and which finally finds exit through the annular passage 10 and through aperture 26 in the reflector 5 and spaced about the sleeve 3 in a similar manner to the arrangement of the aperture 525.

From the foregoing description and by reference to Fig. 1' wherein angles of incidence and reflection of the pencils of light emitted from the lamp are graphically shown by lines and darts, the functions of said reflecting surface will be understood. As described, the reflecting surface 5 of the reflector 5 directs all rays of light received thereon to the lens 20 while the reflecting surface 7 redirects light rays received thereon back to said center of light C whence it is transmitted to the surface 5 and. thence to the lens 20. Thus it will be seen that practically all the light rays from the lamp will eventually be directed to the lenses save a small portion that will be lost in the base and socket of the lamp.

A relatively low-powered lamp may thus be used to obtain a beam of light of great intensity and the lamp may be practically fully inclosed to intercept the amount of light by the provision of forced air supply and exhaust as indicated. The provision of a readily demountable reflector-casing is likewise of considerable merit whereby the lamp may be positioned and replaced without difliculty or delay.

Having described my invention, what I claim is,-

1. In a reflecting apparatus, a reflector arranged to direct all light rays incident thereon in forward direction to a single focus, and another reflector adapted to direct the light rays incident thereon rearwardly upon said first named reflector, said second named reflector arranged to overlap said first named reflector and spaced therefrom to provide an annular opening thereabout.

2. In a reflecting apparatus, a reflector arspaced annular opening thereabout, and detachable connections between said reflectors.

3. In a reflecting apparatus, a reflector arranged to direct all light rays incident thereon in forward directions, a lamp extending forwardly in the axial line of said reflector, a second reflector dctachably connected to said first named reflector and adapted to divert all rays of light incident thereon reversely upon said first named reflector, and

from the latter in overlapped relation to afford an annular opening therebetween, the center of the source of light of said lamp being in the transverse plane of the forward perimetrical edge of said first named reflector.

4:. In a reflecting apparatus, a two-part reflector-casing having a lamp extending forwardly from the rearmost said part in axial direction therein, and a lens casing in the foremost said reflector part having its tubular bore arranged in axial alinement with said lamp, the parts of said reflector casing being arranged in overlapped relation with the foremost part outermost affording an annular opening therebetween, an annular chamber surrounding said lens casing having openings into said reflector-casing, and means for supplying a current of air into said chamber exhausting into said reflectorcasing.

Signed at Bremerton, Wash, this 24 day of June, 1915.


Witness 13mm 0. Anno'rr.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2524435 *Apr 1, 1946Oct 3, 1950Emigh Harry FMultiple head electric lantern
US2914660 *Jun 12, 1957Nov 24, 1959American Optical CorpIlluminators
US3063331 *Mar 2, 1959Nov 13, 1962Gen ElectricProjection system
US3070688 *Dec 14, 1960Dec 25, 1962Gen ElectricLight source system
US3241440 *Dec 26, 1963Mar 22, 1966Bausch & LombIllumination system
US3811763 *Feb 1, 1972May 21, 1974Le Materiel CompactApparatus for reading microdocuments
US4055769 *Jul 9, 1975Oct 25, 1977Conrad SanderMethod and apparatus for curing, a coating on a substrate
US4095113 *Aug 20, 1976Jun 13, 1978Friedrich WolffApparatus for producing ultraviolet radiation
US4196354 *Mar 10, 1978Apr 1, 1980Friedrich WolffApparatus for producing ultraviolet radiation
US4309616 *Nov 28, 1979Jan 5, 1982Friedrich WolffApparatus for producing ultraviolet radiation
US5613767 *Apr 18, 1995Mar 25, 1997Nippon Sheet Glass Co., Ltd.Illuminating apparatus
US6161946 *Nov 9, 1998Dec 19, 2000Bishop; Christopher B.Light reflector
US7018076 *Aug 14, 2003Mar 28, 2006Christie Digital Systems, Inc.High performance reflector cooling system for projectors
US7354177Aug 16, 2006Apr 8, 2008Ruud Lighting, Inc.Light fixture with composite reflector system
US7731368Sep 15, 2006Jun 8, 2010Christie Digital Systems Usa, Inc.Lamp cooling arrangement for cinema projectors
US8944640Feb 6, 2013Feb 3, 2015Martin Professional ApsLamp reflector system with retro reflector
US20050117349 *Aug 14, 2003Jun 2, 2005Christie Digital Systems Inc.High performance reflector cooling system for projectors
US20050219845 *Feb 9, 2005Oct 6, 2005Gregory CutlerIllumination system with improved optical efficiency
US20050231958 *Feb 9, 2005Oct 20, 2005Gregory CutlerIllumination system with improved optical efficiency
US20080043467 *Aug 16, 2006Feb 21, 2008Wilcox Kurt SLight fixture with composite reflector system
US20080123058 *Sep 15, 2006May 29, 2008Christie Digital Systems Inc.Lamp cooling arrangement for cinema projectors
WO2005077037A2 *Feb 9, 2005Aug 25, 2005Reflectivity, Inc.An illumination system with improved optical efficiency
WO2005077037A3 *Feb 9, 2005Sep 4, 2008Gregory CutlerAn illumination system with improved optical efficiency
U.S. Classification362/299, 353/52, 362/294, 250/503.1, 353/99
Cooperative ClassificationF21V13/04