DE2119029A1 - Color television screen - Google Patents

Description

So ei fet *} ditei PRANCJB COULEUR, Societe Anonyme; 101, Boulevard ffiirat; 75-par 16e, France

Parb television screen

The present invention relates to Parbferase receiving picture tubes

Efforts have long been made to mass-produce remote color receivers that have a flat screen that is substantially rectangular _e

The manufacture of such tubes has, however, up to now nor to difficulties that have not yet been resolved in their entirety.

The tube must be able to withstand extremely high pressure forces, which come from an almost total vacuum that prevails inside the tube and on the extensive surface on which the atmospheric pressure acts, _{or the like}

The tube is also made by assembling several

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Parts made, formed on the one hand by the tube neck and the cone and on the other hand by the screen be, and the mechanical. Tensions are in the area of the transition between the screen and the cone strongest. In this area there is also the Discontinuity resulting from assembly

It was proposed to make the screen in 3? Orm a ready To form cuvette, i.e. that the actual screen, on which the projection takes place, a bent over at its edge Has edge. The cut surface of this bent edge serves to connect with the cone »with between for the pail of a tube with a grid ^ tensioned wires are arranged that form the fritter.

The tubes manufactured so far all have a screen that has a certain rounding, which serves the purpose of obtaining a greater resistance to pressure forces ^ and it has not yet been possible to manufacture flat tubes under conditions that allow the desired expansion of the color image.

The present invention fills this ICckec Garaäß of the present invention, the depth of the cuvette ₉ which forms the screen ,, sufficiently large _s chosen so that the flat part of the screen on which the projection takes place, a thickness of the order of 16 mm has what corresponds to a thickness that can be achieved without difficulty using common working techniques in the glass industry _? which applies both to the actual production of the glaze image or the vessel as well as to the subsequent thermal treatment ο

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Eb has been found that a device with a flat screen, in which the depth of the cuvette is greater than the usual depth, but not excessive deviates, the thickness of the screen can be reduced to a value of 16 mm, which corresponds to a value which the glass industry can achieve with the help of tried and tested means and which can be easily produced, so that one does not have to create particularly complicated and expensive tools *

The invention also provides that the bent edge, which thus has a relatively large height, on its outer surface by a rounded edge adapts to the front face of the screen.

The rounding can be more pronounced on certain sides of the bent edge of the screen.

According to another feature of the invention, the front face of the screen is flat, but faces in order to be able to remove them more easily from the mold, they make a very slight angle with respect to the plane perpendicular to the Tube axis in the middle of the screen, so that there is a deflection of one to a few millimeters for results in the part of the screen that is furthest from the axis «

The invention can be applied to screens with a large opening angle, up to BU 110 °.

According to the invention, the outline of the screen, the has a generally rectangular shape, but has rounded corners, so that a television receiver results, which has an attractive appearance.

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The invention is particularly advantageous for Citter tubes, but Bie can also be applied to tubes that work according to the "shell mask ⁿ principle" and it can also be used on black-and-white television receiving tubes.

In the following, the invention will be explained in more detail with reference to a preferred embodiment shown in the drawing _o In the drawing show?

Figo 1 is a longitudinal section through an embodiment of the Invention; and

2 shows a front view of a screen C according to the invention

The screen arrangement 10 comprises an actual image axis 11 which has a bent edge 12 on its circumference has, βο that the entire arrangement has the shape of a generally rectangular cuvette, the screen 11 has an inner surface 13? which is essentially flat and perpendicular ku to the axis 14 of the tube and has an outer surface 15 which is substantially flat, but one has a slight inclination formed by a curvature for the edge of the screen which is furthest from the axis is removed, in the case of a screen with a diagonal of 60 cm length g / mm, and this deflection is used to facilitate removal of the device from the mold O

The depth of the cuvette, d _{o 0} .h the distance between the cutting surface 16 of the bent sand 12 and the surface 13 is on the order of 4-0 mm ₀ Under these conditions,

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the thickness of the actual screen on the Achee! 4 is at * '»rani .; so that the screen arrangement can be produced using the working methods customary in the glass industry _? both the shape and the thermal treatment are attached;,.

The outer outline 15 of the screen is generally rectangular Pormy and has rounded corners 17-20 «the be formed by circumferential arcs with a radius in the order of 15 mm »

Starting from the contour 21 of the outer surface of the actual screen, the outer surface of the bent edge 12 then has a rounded edge 22 and then a part 2 3 axif ρ which has an opposite inclination with respect to the JCohse 14, the inclination being weaker than that Inclination of the rounded edge 22 is _o

The rounding can be more pronounced on the sides of the bent edge, which correspond to the smaller front sides of the Schirman order, _etc.

The screen and the cone 30 are welded to one another along the cut surface 16 of the bent edge 12.

In the neck 31 are the electron guns 32, 33? 34 arranged which are preferably arranged coplanar and with parallel axes,

In the case of a lattice tube, the lattice wires will wipe the bent edge 12 and the cone 30 arranged,

The canopy arrangement can be a part of the "Schattenniaskerf" söhre like a black and white television receiver tube "

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Claims (1)

? 1 1 ! 9029 Sponsorship claims Guvette-shaped screen for a television tube, characterized in that the actual screen (11) has a thickness of the order of 16 mm and an essentially flat outer surface, and that the depth of the cuvette for a tube with an opening of 110 mm ° and a diagonal of 60 cm is in the order of 40 mm <, 2 ο device according to claim I ₉ thereby geke η η - seieh.net that the transition from the front face of the screen to the outer surface of the bent edge was a groove in relation to the front face of the screen, 3o device according to claim 2 _t, characterized in that the groove from the front face of the screen forms a branch o 4o device according to claim 2 or 3, characterized in that - indicates that the outer surface of the bent Edge in the part adjoining the cut surface of the bent edge has a groove that is opposite to that which is adjacent to the outer face of the screen, 5ο device according to one of the preceding claims, characterized in that the * screen has a deflection of the order of one or more millimeters between its outer edge and its center, to facilitate removal from the fona » BAD ORiGINAi 109846 / .1236 - 7 - 6 _; Color television _{receiving tube fl} characterized ₉ that it contains a screen according to one of claims 1-5 * /. Hr-hre?: Acn Antjprueh C ₄ . äad'arch r ■ '- V. er "ti. - indicates that the tube be made of a lattice tube standso 109846/12 36 BATH ORIGINAL