Electric lamp and discharge devices – Cathode ray tube – Envelope
Reexamination Certificate
2001-12-17
2004-01-20
Patel, Vip (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Envelope
C313S495000, C313S493000
Reexamination Certificate
active
06680566
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a television cathode ray tube.
2. Background Information
In simple terms, a cathode ray tube is lined with a phosphorous material that glows when it is struck by a stream of electrons. This material is arranged into an array of millions of tiny cells, usually called dots. At the back of the cathode ray tube is a set of electron guns, which produce a controlled stream of electrons, much as the name implies. To produce a picture on the screen, these guns start at the top of the screen and scan very rapidly from left to right. Then, they return to the leftmost position one line down and scan again, and repeat this to cover the entire screen. In performing this scanning or sweeping type motion, the electron guns are controlled by the data stream coming into the cathode ray tube, which varies the intensity of the electron beam at each position on the screen. This control of the intensity of the electron beam at each dot is what controls the color and brightness of each pixel on the screen. This all happens extremely quickly, and in fact the entire screen is drawn in a small fraction of a second.
There are three electron guns that control the display of red, green and blue light respectively. The surface of the cathode ray tube is arranged to have these dots placed adjacently in a specific pattern. In a monitor, there are separate video streams for each color coming from the video card, which allows the different colors to have different intensities at each point on the screen. By varying the intensity of the red, green and blue streams, the full rainbow of colors is made possible.
The surface of the cathode ray tube only glows for a small fraction of a second before beginning to fade. This means that the cathode ray tube must redraw the picture many times per second to avoid having the screen flicker as it begins to fade and then is renewed. This rapid redrawing is called “refreshing” the screen.
Thus, a cathode ray tube is a special-purpose electron tube in which electrons are accelerated by high-voltage anodes, formed into a beam by focusing electrodes, and projected toward a phosphorescent screen that forms one face of the tube. The beam of electrons leaves a bright spot wherever it strikes the phosphor screen. To form a display, or image, on the screen, the electron beam is deflected in the vertical and horizontal directions either by the electrostatic effect of electrodes within the tube or by magnetic fields produced by coils located around the neck of the tube. Some cathode-ray tubes can produce multiple beams of electrons and have phosphor screens that are capable of displaying more than one color.
Thus, television cathode ray tubes consist of a television glass funnel which, together with the screen or television screen, forms the evacuated space of the cathode ray tube.
In other words, a matching faceplate is secured at the forward portion of the glass funnel. The faceplate may be dimensioned to comprise or accommodate, for example, a 16:9 screen aspect ratio, that is, the ratio of the screen width to screen height, or width:height. Still in other words, the ratio of width to height is often quoted when dealing with different methods of movie presentation. A standard TV screen has a ratio of 4:3, i.e., for every 4 units wide it is 3 units high. This ratio is sometimes quoted as 1.33:1 which is exactly the same as 4:3. Widescreen TVs are obviously wider and their screens have a ratio of 16:9, i.e., for every 16 units wide they are 9 units high. This ratio is the same as 1.78:1.
The television glass funnel itself is divided into three regions: the funnel throat, which contains the electron beam gun and is oriented cylindrically, or is essentially cylindrical, the parabolic area, around which the deflection coil to guide the electron beam is located and which generally has a round surface with a widening cross section; and the funnel body, the cross section surface of which increases steadily and generally makes a transition from a round or oval shape into a rectangular shape, until the cross section surface of the screen is reached. The television glass funnel and screen are connected to each other by means of contact surfaces, which are designated solder edges below.
In other words, the television glass funnel as such is divided into three regions or portions: the funnel throat portion, which contains the electron beam gun and is configured to be a hollow cylinder; the hollow transition portion, around which the deflection coil or like yoke arrangement to magnetically guide the electron beams is located and which transition portion generally has a cylindrically configured, round surface with a widening cross section; and the funnel body, the cross section surface or area of which increases steadily and, generally, makes a transition from a round shape, or oval shape, into a rectangular shape, until the cross section surface or area matches that of the of the screen or faceplate. The television glass funnel and the glass screen or faceplate are connected to one another by way of matching contact surfaces, or contact portions, which are referred to as solder edges, or solder edge portions, below.
The term “rectangular” as used here and below is understood as a surface that essentially describes a rectangular shape, and the corners of which can be rounded. Corresponding to the rectangular shape of the screen, the surface of the area that is painted by the electron beam is also rectangular.
In other words, the term “rectangular” as used herein is to be understood to refer to a surface or configuration that essentially describes a rectangular shape or configuration and the corners of which can be rounded, for example. Corresponding to the rectangular shape or configuration of the screen or faceplate, the surface or area thereof onto which the electron gun beam is directed, is also of rectangular configuration.
OBJECT OF THE INVENTION
The object of one embodiment of the invention is to find a cathode ray tube which has a shape that is shorter than the prior art devices, i.e. one that has a smaller depth or height upon installation.
The object of at least one embodiment is to configure a cathode ray tube with a weight as low as possible.
The object of at least one embodiment is to configure a cathode ray tube to be implosion-proof.
The object of one embodiment of the invention is to find a television glass funnel for a television cathode ray tube which has a shape that is shorter than the funnel that is used in similar devices of the prior art, i.e. one that has a smaller depth. The weight of the funnel must also be as low as possible, and it must also be implosion-proof.
SUMMARY OF THE INVENTION
The invention, in at least one embodiment, teaches a wide-angle, shallow-depth, implosion-resistant television cathode ray tube, comprising: a glass faceplate; the faceplate comprising a substantially flat faceplate with a first surface which becomes an outer surface and substantially the viewing area of the television tube upon installation in a television set, and with a second surface opposite the first surface; the faceplate being configured and dimensioned for a display width of sixteen units and for a display height of nine units; a phosphor screen disposed adjacent to the second surface, being configured to be responsive to electron beams incident thereon, and being configured to emit visible light on the first surface of the faceplate when excited by electron beams; a shadow mask disposed adjacent to the phosphor screen and being configured with apertures configured to permit passage of electron beams therethrough; an electron gun means disposed at a distance away from the shadow mask and being configured to emit electron beams through the apertures of the shadow mask; a glass funnel; the glass funnel comprising (a.), (b.), (c.), (d.), and (e.), where (a.), (b.), (c.), (d.), and (e.) are: (a.) a solder edge portion; the solder edge portion being soldered to the faceplate; the solder edge portion comp
Hergott Stefan
Kehlenbeck Ralf
Knoche Volker
Mühlke Oliver
Vogel Michael
Nils H. Ljungman & Associates
Patel Vip
Schott Glas
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