US 2644208 A
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July 7, 1953 M. AUPHAN 2,644,208
METHOD FOR THE MANUFACTURE OF A SCREEN v FOR A TELEVISION APPARATUS OR THE LIKE Filed June 6, 1950 2 Sheets-Sheet l 3 .a 0^@ @EN LWW/ ffy# www July 7, 1953 E M.'AUPHAN E 2,544,208
METHOD FoR THE` MANUEACTURE oE A SCREEN EoR A TELEVISION APPARATUS oR THE LIKE Filed June 6, 1950 2 Sheets-Sheet 2 Patented July 7, 19.53
METHOD FOR vTHF MANUFACTURE OF A SCREEN FOB A TELEVISION APPARATUS GB, THE LIKE Michel Auphan, Paris, France, assigner to Societe of Monaco Generale dElectrenique, Monaco, Principalty Application June 6, 1950, Serial No.. 166,414 lin France June 11, 1949 Certain devices, for the projection of television images comprise a plate or screen intended to aord a convenient modulating of the light issued from an auxiliary source. Such a device is described, in particular, in my copending application Serial No. 176,355, ledJuly 28, 1950.
The object of the present invention is a method for the preparation oi such a plate or screen for any apparatus of that type or of any other kind where it can be needed, said method, consisting in setting upon the plate a network of line wires or threads as parallel and equidistant as possible, evaporating a suitable intermediate substance on to said plate, removing the threads or wires, setting again a similar network in any other suitable direction, evaporating any suitable substance on to the plate, removing such second network of wires or threads and removing the intermediate substance.
I will now describe the method according to my invention with reference to the accompanying drawings wherein Figures l, 2, 3, 4, 5, 6 and 'i show, schematically the successive stages in the preparation of such a plate.
The supporting plate l having been covered or not with any kind of coating 2, for instance an insulating coating, by any suitable means, (anode oxidation, evaporation in a vacuum, electrophoresis), parallel laments or strands of ne wire are arranged on the plate, the strands being spaced according to the dimensions to be given to the elemental surfaces. These strands may be arranged on the plate I by winding themV possible with the plate, parallel together, and,
equidistant. These Wires will be, for instance,
h1 such a case,
shows, at 4., the deposits thus obtained. The
direction of evaporation is shown by the arrows 5.
The wire is then unwound and the evaporated substance remains, in strips, as shown on Figure 3, denoted by reference numeral 6.,
After the wire has been arranged in a second direction, different from the rst one and with the same conditions of parallelism and equidistance, the selected metal is evaporated to constitute the desired elemental surfaces. Here again, this may be eliected by winding the wire or applying the above-mentioned grating or any other element in a new and adequate direction. Figure 4 illustrates this stage. It shows the metal depositedat l, the VWires and the direction of evaporation shown at 9.
If the wire is then withdrawn, and if the evaporated substance is Adestroyed by any suitable means, (dissolution, evaporation), the desired plate is constituted. It is thus necessary to utilize, as an intermediate substance, a substance which can be destroyed without affecting the plate, its insulating layer or other eventual layers, or facets, elemental surfaces,:tapes or the like, which Vit is desired to obtain. ByA way of example, paraffin, waxor a salt, etc. may be.
. eter of the order of 20 microns, which is arsilk, nylon or any other kind of wires or threads,
of metal for instance, with a diameter of the order of 20' microns or any other suitable dimens1on.
To obtain elemental squares, a rectangular plate will be used, preferably, keeping the parallel wires on one of the sides.
Figure l is a partial diagrammatic section, showing the wires 3 arranged in this manner.
Then a suitable substance is evaporated under a vacuum on to the surface of the plate thus wound, with a suitable direction of evaporation with respect to the plate and wires. Figure 2 ranged so as to have one thread every y microns. Parain is evaporated in a direction perpendicular to the threads, and at 45 with respect to the normal to the'plane of the plate; and this to a thickness of the order of 1.5 microns of paraffin. This obliqueness is not necessary, it simply has the advantage of making one of the edges of the first layer evaporated sharper than the other one.
Figure 6, appended to illustrate this point, shows that the shadow is projected on the edge Il of layer I5 from one point A of the thread I4, closer to the plate than point B whence the shadow is cast on the edge I3. The result is that the edge II of the layer I5 is sharper than its edge I3.
If it is desired to manufacture a fairly large plate, however, Yitmay .be of interest to sacrice this advantage to the necessity of obtaining strips of a uniform thickness, especially if a chamber large enough t0 place the evaporator sufficiently far from the plate is not available. The plate is then placed perpendicularlyto the direction `of evaporation.
After they have been removed, the threads vor wires are again arranged, lfor instance with the same spacing and in afperpendculai" direction (by rotating the grating by 90 parallel to its plane).
The metal evaporation is continued to the required thickness in the same direction as l the rst one, this direction being n ow 45 with respect to the direction of the wiresor threads. The wires orthreads'are then removed' and theparain is evaporated by heating -under a 'reduced pressure.
It vis obvious that the invention is not limited tothe applications offered by pat'ent application Serial No. 176,355, filed July 28, 1950', and that any .other application of its principle and characteristics'iswithin its'scope In particular, the second evaporation vmay be eected perpendicularlyto the plate or in any other suitable direction. This allows the obtention'of 'plates with structures slightly ydifierent fromthat described in the said patent;V for instance, if the'evaporation is effected normally to the plate, the squares, rectangles or other elements will not be detached anda series of corrugated parallel tapes are obtained as shown schematically in Figure '7.
All directionso'f evaporation with respect to the' plate or threads are thus within the scope of the'inventionthechoice to be made depending onlyon' the" application contemplated.
The'components used, plate, support, intermediate substancesfmetal mosaic', are not within 'thescope' or the invention, which remains applicable with theV most varied substances.l Similarly, plate I *is not necessarily a conducting plate or a plate covered with an insulating layer. Numerous' applications may be contemplated in which it is quite differently constituted; It may be, for instance, entirely insulating or entirely conducting. "It may' thus be said that the manufacturing metho'd'applies toany part having a plane face:
The invention extends, by way of new industriai" productsto plates manufactured in this manner.-
What is claimed is: f
1. A method for manufacturing plates for television apparatus Aand the like, comprising the steps' of covering a plate With a set of substantially parallel and Vequidistant spaced iilaments; depositing on said plate a non-metallic substance Iby dissolving the" same.
so as to form intermediate said laments nonmetallic solid strips each being in contact with at least one of said filaments so as at least partly to ill the spaces between said filaments, said non-metallic solid strips being transformable into a ;luid condition; removiingsaid filaments from said' platel so as-to leave said deposits of said non-metallic solid separated from one another vby spaces at least part of which was occupied by said filaments; placing on said deposits of said non.-rnetallicV solid a set of substantially parallel and equ'idistant spaced filaments extending in a direction` different from that of said rst-mentiohed rllamentsj depositing a metallic substance on thearea'siof' said plate and said deposits of said non-metallic usolid between said secondmentioned Afilarrlents so as to form metallic elements having a vbase end portion adhering to said plate and a raised end portion being substantially parallel to said plate and separated from said plate by a distance substantially corresponding tothe thickness of said deposits of said non-metallic solid; removing said seconde' mentioned r"filaments from. said deposits of said non-metallic solid; and .removing said deposits of said'non-m'etallic solid by transforming the same into the iiuid condition thereof.
2f A method according to claim 1 in which the laments are woundA around the plate and the non-metallic substancey isV deposited on one side of said plate.
3'.V A method according to claim l in which the set of substantially parallel and equidistant spaced laments covering the plate consists of a j prefabricate'd grid.
4. A'method according to claim l in which said deposits of said non-metallic solid are removed by evaporating the same.
5. A 'method according to claim 1 in which said deposits of said non-.metallic solid are removed MICHEL AUPHAN.
liste-liesse Gite@ is, the le of this paient SEMES PATENTS Number vName Date 2,139,640 Mall et al. Dec. 6, 1938. 2,243,237 Whiley May 27, 1941 .2,362,507
Steinbock etal. Nov. 14, 1944