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Publication numberUS1092114 A
Publication typeGrant
Publication dateMar 31, 1914
Filing dateFeb 27, 1911
Priority dateFeb 27, 1911
Publication numberUS 1092114 A, US 1092114A, US-A-1092114, US1092114 A, US1092114A
InventorsOtis Angelo Mygatt
Original AssigneeOtis Angelo Mygatt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Prismatic glass reflector.
US 1092114 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

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Specification of Letters Patent.

Application filed February 27. 1911. Serial No. 611,195.

Be it known that I, Oris ANeiELo MYGATLT,

a citizen of the United States, residing at Paris, France, have invented a new and useful Improvement in Prismatic Glass Reflectors, ofwhich the following is a specification.

The object of my invention is to produce a new and improved prismatic glass reflector combining efficient reflecting power with a mechanical action upon light rays which gives to its surface a varied and sparkling appearance, as well as having the advantage that the prisms in themselves are more attractive in appearance.

A- transparent glass reflector having exterior radial reflecting prisms is well known in the art. Such articles,- however, .have had the disadvantage of too uniform and monotonous an appearance, both in themselvesv andin the effect of their illuminated surface. My new construction lends itself more readily to decorative treatment and also acts upon light rays so as'to produce alternating areas ofv d'erently illuminated surfaces, while at the same time furnishing a highly efficient reflector. Y

The prisms on my reflector are substantially radial in direction. The novelty consists in making them with basesl of conlstantly varying width so that the bounding lines of each individual prism alternately converge and diverge. The height of the prism varies proportionately, keeping the apex angle at -the desired angle to produce total double reflection. Numerous experiments with transparent glass reflectors provided with exterior radial prisms of various types and photometric tests of their relative reflecting efficiency show that this construction does not detract from the efliciency of the reector.

Figure 1 is a perspective of a preferred form of my invention; Fig. 2 is atop plan view of a prism; Fig. 3 is a vertical section of a prism.

In Fig. 1, A is a reflector of transparent glassformed by pressing in a mold with the integral radial reflecting prisms B, B1, B2, etc., on its outer surface. The bases of these prisms alternately narrow and widen while their height increases and decreases proportionately so that the apex angle remains that most favorable for producing total l'double reflection. The angle of total or double reflection is inthe neighborhood of 90. -In the reflector here exemplified, the adjacent prisms B and B1 are so constructed that at the point where one is narrowest the other is widest, the advanta e of this construction ybeing that the re ecting prisms thus cover the entire outer surface of the article.

Fig. 2 is a top plan View of prism B in Fig. 1, indicating by cross-hatching at points C and D the smallest and largest cross-sections. The variations'in the width of the glass body throughvwhich light rays pass to the reflecting surface operate to cause the amount of light transmitted per unit of area to vary disproportionately and give to the outer surface a shimmering appearance. Similarly the varying area of the reflecting surface and their disproportionately varying efficiencies give to the inner surface when the reflector is in use over an artificial light source, a waved and variegated appearance ,and marked contrast to the dead uniformity of such articles as heretofore manufactured. Fig. 3 is a vertical section through the apex line of t-he prism shown in Fig. 2. E is Patented Mal'. 31, 1914:.-

a glass body of the reflector; F the reflecting prism. The apex line rises and falls, reaching its greatest height at points Gr where the .base of the prism is -widest and being lowest at points H where the base is narrowest.

The waved construction shown in Fig. 1 provides a reflector whose entire outer surface is covered with reflecting prisms. Vith the curved boundary lines the more gradual blendings of the different illuminated areas gives the glass a changing and animated appearance. An incidental advantagebf the new form of prism employed in my invention is that the prisms themselves may be made in highly decorative forms and can be arranged with respect to each other so as to produce a great variety of decorative patterns.

I claim:

1. A reflector for artificial lights having upon the surface'thereof a number of integral double reflecting prisms, the base and altitude of each of which changes a plurality of times throughout the length of the prism without substantially affecting its double reflect-ing property.

- 2. A reflector for artificial lights. having its surface substantially covered with in- In testimony Whereof,1 aiixiny signaturev tegral radially extendfing prisms, the base in the presence of two witnesses.

and altitude of each o said prisms varying p l repeatedly throughout the length of the y, .OTIVS ANGELO MYGATT prism but preserving such a ratio to each y Witnesses:

other as to remain double reflecting through- Y E. LEAVENWORTH ELLIOTT,

out the length of the said prism. JOEL B. LIBERMAN.

Copies of .this patent may be obtained for ve cents eaoh, by addressing the Commissioner of Patents;

' Washington, ID. C.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2758200 *Jul 22, 1950Aug 7, 1956Holophane Co IncLight transmitters and diffusers
US4842904 *Oct 3, 1986Jun 27, 1989D. Swarovski & Co.Chandelier pendant
US6322236Feb 9, 1999Nov 27, 20013M Innovative Properties CompanyOptical film with defect-reducing surface and method for making same
US7025476 *Apr 25, 2003Apr 11, 2006Acuity Brands, Inc.Prismatic reflectors with a plurality of curved surfaces
US20040218392 *Apr 25, 2003Nov 4, 2004Leadford Kevin F.Prismatic reflectors with a plurality of curved surfaces
U.S. Classification362/337, 362/361
Cooperative ClassificationF21V5/00