US1678218A - Antiglare shield and method of making the same - Google Patents

Description

' July 24,1928.

Y. l i 1,678,218 R. M. vcsRUss ANTIGLARE SHIELD AND METHOD 0F MKING THE SAM w A v-"v Filed June 21, 1925 T D (HF. l x l XX L")`\ (j) L/ I @Q10 X L" j Ill :lil

Jvwentoc vPatented! July 24,' 1928.

ROLAND M. GRUSS, OF SAN FRANCISCO, CALIFORNIA.

Application led .Tune 21,

This invention relates to anti-glare shields.

for automobiles, although it may be used for other purposes.

An object of my present invention is the provision of an anti-glare shield which in a light of average intensity allows objects seen through it to appear in their natural colors, but whichv in comparatively bright light such as sunshine, becomes colored so that the intensity of the light is diminished.

Another object ofmy invention is the provision of an anti-glare shield which in the night time will not obstruct the vision to any appreciable degree when light of ordinary intensity passes through it, 'but which will become colored when a strong light, as from an oncoming automobile, Astrikes it, whereby the glare usually caused by the headlights of oncoming automobiles will be eliminated.

A still further object of my invention is the provision of an anti-glare shield which will change from a substantially colorless state to a colored state as the intensity of the light passing through it is increased.

'A further object of my invention is the provision of a method of making an antiglare shield of the character mentioned.

Other objects will be appreciated by those skilled in the art.

In the drawing accompanying this application,

Figure l is a plan view of an anti-glare shield embodying my invention,

Figures 2 and 3 are sections taken respectively on lines 2 2 and 3 3 of Figure l.

Referring to the drawings for a more detailed description thereof, the numerals 5 and 6 indicate two sheets of solid transparent material which are preferably colorless and may be of glass or other suitable material. The sheets 5 and 6 are separated from each other and they may be separated from each other to any suitable extent, but preferably they are very slightly separated, as shown in Figures 2 and 3, in which case the distance between them may be of the order of one one-thousandth of an inch.

The sheets are separated from each other by a layer of a binding agent 7, such for example as cement, which is adapted to hold the sheets or plates together. This binding agent is interposed between the plates and extends around the borders thereof and may be of a width proportionately shown in Figure l. The space between the plates is filled ANTIGLARE SHIELD AND METHOD OF MAKING THE SAME.

1926. Serial No. 117,451.'

with a material which changes its color as the intensity of light passing through it is increased, and preferably this material is colorless when light of comparatively low intensity passes through it, and becomes colored when a light of comparatively high intensity passes through it.

Further, I prefer to employ a substance of thev character described which is green or yellowish green when exposed to bright light, since these colors are very effective in eliminating glare.

The material of the character described which I place lbetween the plates is preferably in the liquid state, and may be for example, a solution of a substance having substantially the light-responsive qualities of a solution of uranin or of a solution of fluorescein or of a solution of a compound of or of a salt of tluorescein, and the solution preferably has the light-responsive quality of a thin layer of a dilute solution of fluorescein or 'uranin or a salt of liuorescein, and may be a solution of the mentioned substances, and preferably a dilute solution of these substances. A solution of a material of the character described, or of the substances mentioned, ispreferably a'so caller] non-freezing solution, and such solution may be an alcoholic or an etheric solution. The reason for employing a non-freezing solution will be evident when it is considered that the sheets of transparent solid material may be of glass and sealed together.

The antl-glare shield described may be made by spreading on one of the sheets a layer of a solution of the character mentioned, and the other sheet may then be placed on the rst sheet in contact with the solution, but such a method results in the formation of bubbles in the liquid, which of course are undesirable. However, according to mynew method of making theantiglare shield, I apply a layer which is preferably thin of a binding agent to the border of one of the sheets or plates, leaving however, parts of the border as indicated at 9 and l() in Figure l free from the bindingr agent which holds the plates together. I then place the other sheet or plate in contact with the adhesive material or binding agent and apply a pressure to the plates from opposite sides in order to secure good contact of the binding agent with the plates. I then introduce a. solution of the character mentioned, through either the opening 9 or 10, the other opening being provided for the exit of air which will be forced outwardly therethrough throughk the atmosphere by the liquid or solution introduced. The two openings may not be necessary, but I have Jfound that the two are preferable, especially where the plates are only very slightly separated. After the space between the plates has been filled with the liquid or solution, the openings 9 and 10 are filled in with any suitable material, such for example the material employed to bind the ,plates together. v

While I have described one embodiment of my invention, modifications thereof may be readily devised without departing from the spirit of my invention, and it is to be understood that such modilications come within the scope of the appended claims.

A dilute solution which I have successfully employed between glass plates-is made by dissolving one part b weight of uranin v ywhich is the sodium sa t of luorescein 1n two thousand parts by weight of ethyl alcohol.

I claim 1. An anti-glare shield comprising two panes of solid transparent material slightly separated from each other and secured to'- gether, and a dilute, non-freezing solution of fluorescein compound therebetween.

2. An anti-glare shield comprising two panes of solid transparent material slightly separated from each other and secured together by a layer ofadhesive material around the borders of said panes and a dilute alcoholic solution of 'luorescein compound therebetween.

3. An anti-glare shield comprising two pan-es of solid transparent material s eparated rom each other and secured together and a solution of fluorescein compound therebetween.

4. An anti-glare shield comprising two panes of solid transparent material separated from each other and secured t0- gether and a solution of a salt of fluorescein therebetween.

5. An anti-glare shield comprisingtwo panes of solid transparent material separated from each other and secured together and a solution of uranin therebetween.

6. An anti-glare shield comprising two sheets of solid transparent, substantially colorless material and a material -therebetween having substantially the light respon- .sive qualities of a thin lay-er of a dilute alcoholic solution of a compound comprising fiuorescein. y

7. The method of making an anti-glare shield which comprises applying a thin layer of adhesive material to a first sheet of vsolid transparent material around the borders thereotl excepting two parts thereof, placing a second sheet of solid transparent material on said first sheet so that its borders contact with said adhesive material, filling the space between said sheets with a desired liquid and sealing the parts left open for the introduction of th-e mentioned liquid.

8. Two transparent sheets cemented together along the edges so as to form a flat chamber, and a iuorescein 4medium filling y said chamber.

ROLAND M. GRUSS.

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