US1628414A - Projection screen - Google Patents

Description

UNITED STATES PAVITE NT OFFICE;

ARTHUR L. MACBETI-I, 0F BALTIMORE, MARYLAND, ASSIGNOR TO DAYLIGI-IT MOTION PICTURE 00., OF WASHINGTON, DISTRICT OF COLUMBIA, A CORPORATION OF WEST VIRGINIA.

PROJECTION SCREEN.

No Drawing.

This invention relates to projection screens and is designed primarily for use in the daylight exhibition of projected through of glaring rays that would mar,

the vision and be lnjurious to the eyes of persons seated in front of the screen.

It is an object of the presentinvention to provide a screen which is inexpensive to produce and which overcomes the disadvantages mentioned by meeting the stated requirements.

With the foregoing and other objects in View, which will appear as the description proceeds, the invention consists of certain novel details and combinations which will be hereinafter more fully described and.

pointed out in the claims, it being understood that various changes may be made therein within the scope of the claims, with out departing from the spirit of the inven-' tion.

In making the screen there is provided a base of a suitable fabric such as silk, linen or cotton. Under some conditions it has been found desirable to first saturate this After this initial treat- Application filed November 16, 1925. Serial No. 69,500.

following ingredients substantially in the proportions stated, to wit:

Parts by bulk. Canadian balsam 2 Oil of sassafras 2 Litharge 1 Pure linseed oil 5 The foregoing ingredients are thoroughly mixed and the fabric is submerged therein so as to become saturated. Thereafter surplus material is wiped from the surface of the fabric and said surface is rubbed so as to be left smooth. The screen thus produced is allowed to dry and the resultant article will be translucent and opalescent and will act as a screen to prevent the pas sage therethrough of the glare or bright rays which would otherwise prevent satisfactory use of the screen.

In the mixture constituting the treating material the Canadian balsam acts as a binder for holding the preparation to the fabric and, in a sense, has the same properties as the diluted bullocks blood. Theoil of sassafras increases the penetrating 'quality of the mixture and the litharge gives body theretof The linseed oil forms the main ingredient and serves to give the screen a smooth, weatherproof surface having the desirable sheen.

lVhen images are projected against the back of a screen made as herein described, they will be displayed in a soft restful light through the screen and will be plainly visible in daylight when the conditions are met as called for in my patent hereinbefore mentioned.

It might be stated that an added advantage in using oil of sassafras inthe mixture is that this oil has been found to prevent discoloration of the screen under the action of light rays.

What is claimed is:

l. A projection screen including a fabric base, and heat and moisture resisting means for rendering the base translucent, opalescent and weatherproof, said meansincluding a solution of Canadian balsam, and linseed oil.

2. A projection screen including a fabric base, and heatand moisture resisting means 3. A. UPUjUUUUH M's-c011 inuhullngi mmw base, and heat and IHOISUHQ remshng: mmum 1mm and Weatherproof, said means iin-lmlingg Jmiadiiin 15211521111, linseed oil, oil of szlsszl'ims and :1 filler.

A projection screen 11101 mung n Min-M base, and nleans Pm: rmu'leir'mg the bilfiU