US1736619A - Process of treating glass for illumination purposes - Google Patents

Description

NOV. 19, 1929. s, NYE 1,736,619 PROCESS OF TREATING GLASS FOR ILLUMINATION PURPOSES Filed Feb. 14,. 1928 5124 121211111 E. N E

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Patented Nov. 19, 1929 lfl E STATES PATENT oF -c-E SEL'ERIVIAN G. NYE, OF DENVER, COLORADO, ASSIG-NOR, BY DIRECT AND IYIESNE'ASSIGN- MENTS, OF PART INTEREST TO OSCAR D. CASS AND E. E. NEWMAN, BOTH OF DEN- VER, COLORADO PROCESS OF TREATING GLASS FOR ILLUMINATION PURPOSES I Application filed February 14, 1928. Serial No. 254,817;

produced by the transmission of light through clear untreated glass.

A further object of theinvention is to treat the glass so to obtain a very intense -iighly diffused light without objectionable sacrifice of illumination effect to obtain the desired diffusion. I

Other objects of the invention will appear as the detailed description of the invention proceeds.

In order that the process of treating the glass may be clearly understood, reference is made to the accompanying drawings, in which:

Figure 1 is a perspective View of a circular disk of plain glass before being subjected to the process described herein;

Figure 2 is a plan view of the disk showing one face of the disk after being subjected to the first step in the process;

Figure 3 is similar view of the same face of the disk with an annular mat applied to said face before subjecting it to the second step in the process;

Figure 4 is a plan view of the disk after out on the previously treated face of the disk;

Figure 5 is a similar view of the treated face of the disk after completion of the second step, but with asecond mat having a slightly larger circular opening substituted for the first mat;

Figure 6 a plan of the finished disk; and Figure '2 is a fragmentary section to an enlarged scale taken on the line 7-7 of Figure 6.

the diameter of the disk.

form a circular disk adapted for use in an automobileheadlight. The first step in the process of treating the disk consists in finely frosting one face of the disk 1 by any desired method-either by grinding or by sand blasting it to produce the desired frosted effect.

Preferably the next step is to paste or otherwise secure an annular mat or stencil 2 to the frosted face. The radial Width of the annulus between the peripheries of its inner and outer rings is preferably "about one-fourth The frosted face of the disk 1 within the circle 3 is then thoroughly impregnated with clear white Vaseline or any clear transparent oil, rubbed into the'frosted face inside the circle? The mat'2 is then removed, leaving the disk 1 with a circular area 4; coated with oil and with an annular area 2 frosted and dry.

The next step in the process consists in suitably fixing a mat or stencil 5, having its central circular opening 6 of slightly larger diameter than circle 3, to the frosted annular part 2 of the disk 1-. The stencil 5 is arranged with its opening concentric wlth the oiled part 4; to leave an annular frosted space 7 between the periphery of circle 6 and the circular edge 8 of the oiled part. The oiled circle l and the frosted annulus 7 are then coated with a cleartransparent lacquer which is allowed to dry.

Finally, the second mat 5 is removed and the finished disk is ready for use. As finished this disk comprises a sheet of glass having one face plain and its other face frosted, the frosted face having an outer annular part 9 uncoated and having a transparent lacquer skin 10 centrally secured to the frosted facet-o form therewith a cell having oil interposed between the lacquer skin and the frosted face of the glass.

lVhile the lacquer is referred to as forming a skin over the oil, it must be understood that this is for purpose of description only. It is not known Whether it mixes in some peculiar manner with the oil or not. It is known, however, by experimental use eX- tending ver a year that the lacquer coating does 1;. eat spreading of the oil over the only a partly oiled frosted surface.

frosted face of the disk, and may be freely rubbed by the hand Without showing any trace of contact With the oil.

In addition to its intensity, the light emitted has no glare effect, and its uniform diffusions eliminates the shadows and zones of relative darkness so common With lenses having irregular ditlracting surfaces.

The process must not be considered as limited in anyway to circular disks hayli iyllg e whole frosted surface'may be oiled; but the oiled frosted surface must also be lacquered. Neither oil nor lacquer alone Will produce the desired result; nor will oil or lacquer, or lacquer and oil produce the desired effect on unfrosted glass. It is essential that the glass be plain on one side, frosted on the other; that the frosted side be Wholly or partially coated With oil Well rubbed in to the frosted glass; and finally that the oiled and frosted glass be covered With a transparent lacquer or the equivalent thereof.

What I claim is:

1. A lens for lamps comprising a sheet of glass having one face thereof plain and the o other face roughened, a coating of transparent oil on the said other face, and a coating of transparent material superposed on the oil coating.

2. The process of treating plain transparent glass to form a lens for illumination purposes which consists in roughening one face of said glass, oiling part of said roughened face, and coating the oiled roughened surface With a transparent lacquer.

3. A lens for lamps comprising a circular disk of transparent plain glass having one face thereof frosted roughening, a circular coating of oil of smaller diameter than said disk and concentrically arranged thereon, and a coating of transparent lacquer covering the oiled part of said disk.

In testimony whereof I affix my signature.

SHERMAN Gr. NYE.

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