US1934802A - Moving picture screen and method of making it - Google Patents
Moving picture screen and method of making it Download PDFInfo
- Publication number
- US1934802A US1934802A US427582A US42758230A US1934802A US 1934802 A US1934802 A US 1934802A US 427582 A US427582 A US 427582A US 42758230 A US42758230 A US 42758230A US 1934802 A US1934802 A US 1934802A
- Authority
- US
- United States
- Prior art keywords
- sheet
- glass
- making
- moving picture
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 4
- 239000011521 glass Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 6
- 229920002160 Celluloid Polymers 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229920001220 nitrocellulos Polymers 0.000 description 2
- 229940079938 nitrocellulose Drugs 0.000 description 2
- LZDKZFUFMNSQCJ-UHFFFAOYSA-N 1,2-diethoxyethane Chemical compound CCOCCOCC LZDKZFUFMNSQCJ-UHFFFAOYSA-N 0.000 description 1
- 108010010803 Gelatin Proteins 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/08—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of cellulosic plastic substance or gelatin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
- B32B17/1022—Metallic coatings
Definitions
- the invention relates to a moving picture screen.
- a further object is the provision of a screen of improved appearance, easily cleanedvand not subject to surface deterioration upon repeated cleaning.
- a still further object is the provision of a method of producing the screen so as to secure permanency, permit the use of a front sheet of glass of minimum thickness, and reduce the cost of breakage in manufacture to a minimum.
- Figure 1 is a face view of the screen.
- Fig. 2 is a section on the line lI-II of Fig. 1.
- a front sheet of glass 1 is silvered upon its rear face with a film or coating 2. This coating does not extend entirely over the back of the sheet, a border portion 3 being left which is free from the silvering.
- the sheet 1 is then incorporated into a composite plate, which includes a sheet 4 of pyroxylin plastic, such as celluloid, and aback sheet 5 of glass.
- the three sheets are secured together by means of the layers of cement 6 and '1, the cement used being preferably gelatin, although any other suitable cement may be substituted.
- the compositing is preferably accomplished in the usual way under heat and pressure, so that the three sheets are secured together permanently in the form of a composite plate.
- the use of the unsilvered border portion 3 adds to the security with which the front sheet 1 is attached to the sheet 4, as the silver 4 does not have anything like the adherence to the glass as does the cement.
- the border portion therefore, insures that the front plate 1 shall be held with the necessary degree of security during the grinding operation, as later described.
- the border portion thus securely attaches the thin silvered sheet to the reinforcingback; holding it flrmly in position and insuring it against movement with respect to the backing during the grinding operation, as later described.
- the layers of cement might be dispensed with and the celluloid secured to the border 3 of glass and to the back sheet 5 by making the celluloid tackyor sticky by the use of a solvent or plasticiser for the celluloid, such as diethylglycol or acetone.
- a solvent or plasticiser for the celluloid such as diethylglycol or acetone.
- the sheet might also be reduced to the proper thickness by the use of a sand blast instead 0 by grinding, although the latter method is preferable.
- the plate After the plate has been composited, as above described, it is placed upon a grinding table and the sheet 1 is ground as thin as possible, preferably to a thickness of of an inch or less since the effectiveness of the screen depends upon having a very thin body of glass between the ground surface and the silvering.
- This grinding operation completes the screen.
- the screen has a high degree of permanence, since the silvering is protected by the glass sheet 1 and because of the hardness of glass, the front face .of the sheet 1 can be cleaned repeatedly and thoroughly without in any way injuring such surface. The cleaning of such a glass surface is also much more easily accomplished than is the case with a metal surface, such as that of the aluminum screens heretofore used extensively with small moving picture outfits.
- silvering is used in its broad sense to cover either a coating with silver or quick silver, the coating with silver, however, being preferred and constituting the modern method of silvering. It will be understood that the showing of the layers of material in'Fig. 2 is much exaggerated, particularly as to the layers of cement and silver. These are actually mere films of such extreme thinness that it is very diflicult to even measure such thickness.
- a picture screen comprising a front sheet of very thin glass having its front surface ground and having its rear surface silvered with the exception of a border portion extending around the surface at its edge, a back sheet of glass, and an interposed sheet of pyroxylin plastic extending into said border portion to which both sheets of glass are attached.
- a reflecting screen comprising a sheet of glass partially coated upon one side with a reflecting material and a sheet of impervious material secured thereto by means of a reinforcing material which encloses-the reflecting material.
- a reflecting screen comprising a sheet of glass ground partially on one side and partially coated upon the other side with a reflecting material and a sheet ofglass secured thereto by means of reinforcing plastic material which encloses the reflecting material.
Description
:Nov- 14, 1933.
H, K. HITCHCOCK MOVING PICTURE SCREEN AND METHOD OF MAKING IT Filed Feb. 11., 1950 INVENTOR JW f Q/M Patented Nov. 14, 1933 TES UNITED STA ,MOVING PICTURE SCREEN AND METHOD OF MAKING IT llalbert K. Hitchcock, Pittsburgh, Pa., assignor to Pittsburgh Plate Glass Company, a corporation of Pennsylvania Application February 11, 1930. Serial No. 427,582
3 Claims.
The invention relates to a moving picture screen.
5 and one which has a greater reflecting, capacity than those heretofore employed, thus resulting in a brighter, more distinct image than has heretofore been secured in screens heretofore used. A further object is the provision of a screen of improved appearance, easily cleanedvand not subject to surface deterioration upon repeated cleaning. A still further object is the provision of a method of producing the screen so as to secure permanency, permit the use of a front sheet of glass of minimum thickness, and reduce the cost of breakage in manufacture to a minimum. One embodiment of the invention is shown in the accompanying drawing, wherein:
Figure 1 is a face view of the screen. And Fig. 2 is a section on the line lI-II of Fig. 1.
In making the shield, a front sheet of glass 1 is silvered upon its rear face with a film or coating 2. This coating does not extend entirely over the back of the sheet, a border portion 3 being left which is free from the silvering. The sheet 1 is then incorporated into a composite plate, which includes a sheet 4 of pyroxylin plastic, such as celluloid, and aback sheet 5 of glass. The three sheets are secured together by means of the layers of cement 6 and '1, the cement used being preferably gelatin, although any other suitable cement may be substituted. The compositing is preferably accomplished in the usual way under heat and pressure, so that the three sheets are secured together permanently in the form of a composite plate. The use of the unsilvered border portion 3 adds to the security with which the front sheet 1 is attached to the sheet 4, as the silver 4 does not have anything like the adherence to the glass as does the cement. The border portion, therefore, insures that the front plate 1 shall be held with the necessary degree of security during the grinding operation, as later described. The border portion thus securely attaches the thin silvered sheet to the reinforcingback; holding it flrmly in position and insuring it against movement with respect to the backing during the grinding operation, as later described. If desired the layers of cement might be dispensed with and the celluloid secured to the border 3 of glass and to the back sheet 5 by making the celluloid tackyor sticky by the use of a solvent or plasticiser for the celluloid, such as diethylglycol or acetone.
' The sheet might also be reduced to the proper thickness by the use of a sand blast instead 0 by grinding, although the latter method is preferable.
After the plate has been composited, as above described, it is placed upon a grinding table and the sheet 1 is ground as thin as possible, preferably to a thickness of of an inch or less since the effectiveness of the screen depends upon having a very thin body of glass between the ground surface and the silvering. This grinding operation completes the screen. The screen has a high degree of permanence, since the silvering is protected by the glass sheet 1 and because of the hardness of glass, the front face .of the sheet 1 can be cleaned repeatedly and thoroughly without in any way injuring such surface. The cleaning of such a glass surface is also much more easily accomplished than is the case with a metal surface, such as that of the aluminum screens heretofore used extensively with small moving picture outfits. The term silvering is used in its broad sense to cover either a coating with silver or quick silver, the coating with silver, however, being preferred and constituting the modern method of silvering. It will be understood that the showing of the layers of material in'Fig. 2 is much exaggerated, particularly as to the layers of cement and silver. These are actually mere films of such extreme thinness that it is very diflicult to even measure such thickness.
Whatv I claim is:
l. A picture screen comprising a front sheet of very thin glass having its front surface ground and having its rear surface silvered with the exception of a border portion extending around the surface at its edge, a back sheet of glass, and an interposed sheet of pyroxylin plastic extending into said border portion to which both sheets of glass are attached.
2. A reflecting screen comprising a sheet of glass partially coated upon one side with a reflecting material and a sheet of impervious material secured thereto by means of a reinforcing material which encloses-the reflecting material.
3. A reflecting screen comprising a sheet of glass ground partially on one side and partially coated upon the other side with a reflecting material and a sheet ofglass secured thereto by means of reinforcing plastic material which encloses the reflecting material.
- H. K. HITCHCOCK.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US427582A US1934802A (en) | 1930-02-11 | 1930-02-11 | Moving picture screen and method of making it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US427582A US1934802A (en) | 1930-02-11 | 1930-02-11 | Moving picture screen and method of making it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1934802A true US1934802A (en) | 1933-11-14 |
Family
ID=23695465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US427582A Expired - Lifetime US1934802A (en) | 1930-02-11 | 1930-02-11 | Moving picture screen and method of making it |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1934802A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468568A (en) * | 1945-09-27 | 1949-04-26 | Safetee Glass Company | Laminated mirror |
| US2875087A (en) * | 1954-02-23 | 1959-02-24 | American Optical Corp | Method of forming reflective surfaces |
| EP1347332A1 (en) | 2000-09-22 | 2003-09-24 | Mitsubishi Denki Kabushiki Kaisha | Projection screen unit and display system |
| ITUB20153198A1 (en) * | 2015-08-24 | 2017-02-24 | Galvolux Sa | DOUBLE SAFETY MIRROR AND METHOD OF REALIZING THE SAME. |
| EP3135482A1 (en) * | 2015-08-24 | 2017-03-01 | Galvolux SA | Double safety mirror and method of manufacturing thereof |
-
1930
- 1930-02-11 US US427582A patent/US1934802A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2468568A (en) * | 1945-09-27 | 1949-04-26 | Safetee Glass Company | Laminated mirror |
| US2875087A (en) * | 1954-02-23 | 1959-02-24 | American Optical Corp | Method of forming reflective surfaces |
| EP1347332A1 (en) | 2000-09-22 | 2003-09-24 | Mitsubishi Denki Kabushiki Kaisha | Projection screen unit and display system |
| US6844967B2 (en) | 2000-09-22 | 2005-01-18 | Mitsubishi Denki Kabushiki Kaisha | Screen unit and display system |
| ITUB20153198A1 (en) * | 2015-08-24 | 2017-02-24 | Galvolux Sa | DOUBLE SAFETY MIRROR AND METHOD OF REALIZING THE SAME. |
| EP3135482A1 (en) * | 2015-08-24 | 2017-03-01 | Galvolux SA | Double safety mirror and method of manufacturing thereof |
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