US3340358A - Cathode-ray tube - Google Patents
Cathode-ray tube Download PDFInfo
- Publication number
- US3340358A US3340358A US254231A US25423163A US3340358A US 3340358 A US3340358 A US 3340358A US 254231 A US254231 A US 254231A US 25423163 A US25423163 A US 25423163A US 3340358 A US3340358 A US 3340358A
- Authority
- US
- United States
- Prior art keywords
- envelope
- cathode
- ray tube
- tube
- frame
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/87—Arrangements for preventing or limiting effects of implosion of vessels or containers
Definitions
- Our invention relates to glass cathode-ray tubes the glass bulb of which is surrounded in part by an envelope which also serves, at least in part, as a frame for the display surface. More particularly, the invention relates to envelopes for cathode ray tubes comprising at least two annular parts, one annular part also serving as a frame for the display surface and one or more other annular parts of the envelope surrounding at least part of the cone of the tube.
- the sealed edge between the window and the cone of the bulb is surrounded by a clamping 'band, while a cement layer may be provided, if desired, between the band and the glass.
- a clamping band in the form of an envelope as above described is often impossible since the envelope has to be matched to the state of the bulb and the mechanical provision of clamping stress, for example, by means of pull-bolts, which then gives rise to an irregular distribution of forces.
- a further disadvantage of the metal envelopes above described is that the part constituting the frame for the display surface is apt to be touched by the viewer.
- the metal envelope cannot be insulated lest it receives uncontrolled charges, the envelope must be connected to the chassis of the device.
- the tubes are usually powered in series, so that the chassis is connected to one pole of the power supply.
- the chassis may thus have a definite potential with respect to ground, dependent upon the position in which the plug is inserted into the socket, so that it is extremely dangerous to touch the metal frame.
- a further object of our invention is the provision of a protective guard for a cathode-ray tube in which metal protective parts are inaccessible to the viewer thus assuring greater safety to the viewer.
- a still further object of our invention is the provision of a protective guard for a cathode-ray tube which sub- Patented Sept. 5, 1967 stantially reduces the risk of implosion and yet is simple to fabricate.
- annular part of an envelope surrounding a cathode-ray tube and serving as a frame for the display surface is made from a hard insulating material which may be armored, if desired, while the space between the glass bulb and the envelope is filled with a non-elastic, coherent mass, preferably hard, which is introduced into said space in a castable or moldable state.
- the envelope preferably comprises a plurality of annular parts, one part of which serves as a frame for the display surface.
- the ring serving as a frame is preferably made from a hard synthetic material, such as synthetic resin or a hard plastic, which may contain glass or metal fibres or textures or in which a metallic band may be provided.
- the filling mass is preferably a material which may be poured into the space in the molten state and, after solidification, constitutes a non-elastic coherent mass of sufiicient hardness.
- Very suitable filling masses are: sulfur, horn material or'resin and certain kinds of hard asphalt. It is also possible to provide the filling mass as a hydraulically-hardenable suspension, such as gypsum, (Portland cement) concrete or mortar. If desired, use may be made of material which hardens to form a porous, hard mass, provided it has sufiicient resistivity to deformation after hardening. Synthetic material which hardens by the action of a hardening agent is also very suitable.
- annular part serving as a mask for the display surface is of a material differing from that of the other part of the envelope.
- a mask must consist of elastic material, for example rubber.
- the filler specified for embedding the parts of the envelope is also an elastic material, for example, rubber. Consequently, this known design cannot reduce the risk of impolsion.
- FIG. 1 shows one embodiment of a cathode-ray tube according to the invention
- FIG. 2 is a sectional view of part of another embodiment.
- FIG. 2a is an enlarged view of a corner of the envelope shown in FIG. 2.
- FIG. 1 the cone of the glass bulb is indicated by 1 and the viewing screen by 2.
- the cone 1 is surrounded by an annular part 3, in this example metallic, of an envelope, while an annular part 4, which also serves as a frame for the display surface 2, is made of a hard insulating material, preferably a synthetic resin, which may be armored, if desired.
- the ring 3 has a flange 5 and the ring 4 has a flange 6 molded thereto.
- the flanges 5 and 6 are provided with apertures and connected together by means of rivets 7 after the parts 3 and 4 have been placed around the cathode-ray tube which is otherwise already fully completed.
- the dimensions of the parts 3 and 4 are such that these parts and the glass bulb 1, 2 remain separated by a gap which is filled by casting or pressing with a hardenable material 8.
- a very suitable material is a hard kind of asphalt or mastic, or horn material from cows horns or horses-hoofs which is poured in the molten state into protuberances 9.
- the bulb and the envelope are slightly heated, if necessary, for example, up to about 50 C., so that the mass 8 does not solidify too quickly and can fill the gap-shaped space completely.
- the ring 4 is provided with an armor in the form of an embedded metal band as shown in greater detail in FIG. 2a.
- an armor in the form of an embedded metal band as shown in greater detail in FIG. 2a.
- the ring 4 in this case preferably consists of synthetic material, such as a polyester or a synthetic T65111- Since no metal parts can be touched from the front of the tube, it is not objectionable if the ring or rings 3, which may be of metal, if desired, acquire a potential relative to earth.
- the ring 3 may alternatively consist of hard insulating material, it is in general desirable to make this ring from metal since it may then be active as a capacitor electrode and as an electrical and, if desired, magnetic shield.
- the filler 8 is sulfur, which may be poured in the molten state between the bulb and the envelope, it is desirable for the edge of the filled space to be coated afterwards with a thin varnish layer 10, since otherwise silvered conductors or silver contacts in the apparatus are apt to be chemically attacked.
- the envelope 3, 4 does not exert any appreciable pressure on the glass of the bulb, it has been found that, due to the use of the hard filler, sufficient resistance is created as soon as the glass tends to make way, for example due to the occurrence of a crack. Such a crack does not substantially extend farther below the filler so that implosion no longer can occur in practice.
- the insulating layer of the ring 4 in FIG. 2 has a thickness such. that it is impossible to touch the metal armor 11, for example, by scratching with a sharp object.
- Such armor may contact, if desired, through a flange or lug fully embedded in insulating material, with the rivets 7 so that charging by induction is avoided. In fact, such charge could give rise to interference due to additional deflection of the cathode-ray.
- the flanges 5, 6 may also serve to harden the tube in the cabinet of the apparatus.
- the filler 8 may, if desired, be gypsum or concrete (Portland cement) mixed, if desired, with sand (mortar) and be poured as an aqueous suspension between the bulb and the envelope.
- the filler may alternatively be hardenable mixtures of other materials.
- a mixture of heated oxide and glycerin is also usable.
- Loose non-coherent materials, such as sand, are unsuitable, as well as filler masses which are elastic. However, such materials may be added to the mass, if desired, as fillers.
- annular parts of the envelope, as well as the filling mass shall consist of materials which are non-elastic and harden sufficiently and that the part of the envelope which serves as a frame for the display surface, except for any armor, consist of a hard, non-elastic insulating material.
- this ring may be of ceramic material.
- a thin insulating surface layer, for example of varnish may readily be scratched through by a sharp object so that contact with the metal is possible.
- a cathode-ray tube comprising a transparent window portion and an adjoining cone portion, an envelope spaced from and surrounding a portion of the cone portion of the tube and having a portion forming a frame for the transparent window portion, said latter portion of said envelope being constituted of a hard insulating synthetic resin, and a non-elastic, coherent mass of horn material occupying the space between the envelope and the portions of the tube surrounded thereby.
- a cathode-ray tube comprising a transparent window portion and an adjoining cone portion, an envelope spaced from and surrounding a portion of the cone portion of the tube and having a portion forming a frame for the transparent window portion, said latter portion of said envelope being constituted of a hard insulating synthetic resin, and a non-elastic, coherent mass of hardened asphalt occupying the space between the envelope and the portions of the tube surrounded thereby.
- a cathode-ray tube comprising a transparent window portion and an adjoining cone portion, an envelope spaced from and surrounding a portion of the cone portion of the tube and having a portion forming a frame for the transparent window portion, said latter portion of said envelope being constituted of a hard insulating synthetic resin, and a non-elastic, coherent mass of sulfur occupying the space between the envelope and the portions of the tube surrounded thereby.
- a cathode-ray tube comprising a transparent window portion and an adjoining cone portion, an envelope spaced from and surrounding a portion of the cone portion of the tube and having a portion forming a frame for the transparent window portion, said latter portion of said envelope being constituted of a hard insulating synthetic resin, and a non-elastic, coherent mass of hardened concrete occupying the space between the envelope and the portions of the tube surrounded thereby.
- a cathode-ray tube comprising a transparent window portion and an adjoining cone portion, an envelope spaced fromand surrounding a portion of the cone portion of the tube and having a portion forming a frame for the transparent window of said envelope being constituted of a hard insulating synthetic resin, and a non-elastic, coherent mass of hardened gypsum occupying the space between the envelope and the portions of the tube surrounded thereby.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL274116 | 1962-01-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3340358A true US3340358A (en) | 1967-09-05 |
Family
ID=19753575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US254231A Expired - Lifetime US3340358A (en) | 1962-01-29 | 1963-01-28 | Cathode-ray tube |
Country Status (8)
Country | Link |
---|---|
US (1) | US3340358A (xx) |
AT (1) | AT247932B (xx) |
BE (1) | BE627679A (xx) |
CH (1) | CH409158A (xx) |
DE (1) | DE1464304B2 (xx) |
DK (1) | DK103626C (xx) |
ES (1) | ES284550A1 (xx) |
GB (1) | GB974651A (xx) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2448005A (en) * | 1946-03-26 | 1948-08-24 | Montclair Res Corp | Aqueous wool treating baths comprising chloroprene copolymers |
US3412203A (en) * | 1965-08-16 | 1968-11-19 | Mercury Aircraft Inc | Tv picture tube and mounting frame assembly |
US3417201A (en) * | 1965-07-01 | 1968-12-17 | Gen Electric | Magnetic shield for cathode ray tube |
US3422220A (en) * | 1965-06-09 | 1969-01-14 | Philips Corp | Color television display tube with ferromagnetic screening member |
US3569990A (en) * | 1967-03-03 | 1971-03-09 | Thorn Radio Valves And Tubes L | Implosion protection apparatus for cathode ray tubes |
US3614519A (en) * | 1967-12-18 | 1971-10-19 | Zenith Radio Corp | Cathode-ray tube magnetic shield |
US4012773A (en) * | 1975-11-17 | 1977-03-15 | Zenith Radio Corporation | Color television picture tubes with improved implosion protection system |
US4850921A (en) * | 1985-12-04 | 1989-07-25 | Hitachi, Ltd. | Full automatic total inspection system for implosion-protected cathode-ray tube |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1641403A (en) * | 1923-11-09 | 1927-09-06 | Eastman Kodak Co | Process and apparatus for uniting strips of material |
US1981141A (en) * | 1931-01-29 | 1934-11-20 | Celluloid Corp | Cementing foil and thin film |
US2756892A (en) * | 1956-07-31 | Bleuze efal | ||
US2785820A (en) * | 1952-06-28 | 1957-03-19 | Owens Illinois Glass Co | Controlling implosions in cathode ray and other tubes |
US3007833A (en) * | 1958-12-29 | 1961-11-07 | Dow Chemical Co | Method of lamination |
US3097061A (en) * | 1959-01-16 | 1963-07-09 | Spiegelglaswerke Germania Ag Z | Process for the preparation of multi-pane insulating glass |
US3206056A (en) * | 1960-12-09 | 1965-09-14 | Philips Corp | Glass cathode-ray tube for the reproduction of images |
US3310194A (en) * | 1961-04-28 | 1967-03-21 | Loing Verreries | Cathode ray tube envelope |
-
0
- BE BE627679D patent/BE627679A/xx unknown
-
1963
- 1963-01-25 DE DE19631464304 patent/DE1464304B2/de active Pending
- 1963-01-25 GB GB3235/63A patent/GB974651A/en not_active Expired
- 1963-01-26 DK DK38763AA patent/DK103626C/da active
- 1963-01-26 ES ES284550A patent/ES284550A1/es not_active Expired
- 1963-01-26 CH CH96263A patent/CH409158A/de unknown
- 1963-01-28 US US254231A patent/US3340358A/en not_active Expired - Lifetime
- 1963-01-28 AT AT64363A patent/AT247932B/de active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2756892A (en) * | 1956-07-31 | Bleuze efal | ||
US1641403A (en) * | 1923-11-09 | 1927-09-06 | Eastman Kodak Co | Process and apparatus for uniting strips of material |
US1981141A (en) * | 1931-01-29 | 1934-11-20 | Celluloid Corp | Cementing foil and thin film |
US2785820A (en) * | 1952-06-28 | 1957-03-19 | Owens Illinois Glass Co | Controlling implosions in cathode ray and other tubes |
US3007833A (en) * | 1958-12-29 | 1961-11-07 | Dow Chemical Co | Method of lamination |
US3097061A (en) * | 1959-01-16 | 1963-07-09 | Spiegelglaswerke Germania Ag Z | Process for the preparation of multi-pane insulating glass |
US3206056A (en) * | 1960-12-09 | 1965-09-14 | Philips Corp | Glass cathode-ray tube for the reproduction of images |
US3310194A (en) * | 1961-04-28 | 1967-03-21 | Loing Verreries | Cathode ray tube envelope |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2448005A (en) * | 1946-03-26 | 1948-08-24 | Montclair Res Corp | Aqueous wool treating baths comprising chloroprene copolymers |
US3422220A (en) * | 1965-06-09 | 1969-01-14 | Philips Corp | Color television display tube with ferromagnetic screening member |
US3417201A (en) * | 1965-07-01 | 1968-12-17 | Gen Electric | Magnetic shield for cathode ray tube |
US3412203A (en) * | 1965-08-16 | 1968-11-19 | Mercury Aircraft Inc | Tv picture tube and mounting frame assembly |
US3569990A (en) * | 1967-03-03 | 1971-03-09 | Thorn Radio Valves And Tubes L | Implosion protection apparatus for cathode ray tubes |
US3614519A (en) * | 1967-12-18 | 1971-10-19 | Zenith Radio Corp | Cathode-ray tube magnetic shield |
US4012773A (en) * | 1975-11-17 | 1977-03-15 | Zenith Radio Corporation | Color television picture tubes with improved implosion protection system |
US4850921A (en) * | 1985-12-04 | 1989-07-25 | Hitachi, Ltd. | Full automatic total inspection system for implosion-protected cathode-ray tube |
Also Published As
Publication number | Publication date |
---|---|
DE1464304B2 (de) | 1971-08-12 |
GB974651A (en) | 1964-11-11 |
DE1464304A1 (de) | 1969-02-20 |
BE627679A (xx) | |
AT247932B (de) | 1966-07-11 |
ES284550A1 (es) | 1963-03-16 |
DK103626C (da) | 1966-01-31 |
CH409158A (de) | 1966-03-15 |
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