EP0511333A1 - Kathodenstrahlröhre. - Google Patents
Kathodenstrahlröhre.Info
- Publication number
- EP0511333A1 EP0511333A1 EP91918207A EP91918207A EP0511333A1 EP 0511333 A1 EP0511333 A1 EP 0511333A1 EP 91918207 A EP91918207 A EP 91918207A EP 91918207 A EP91918207 A EP 91918207A EP 0511333 A1 EP0511333 A1 EP 0511333A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cathode ray
- ray tube
- luminescent layer
- permanent
- distortion
- 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.)
- Granted
Links
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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/70—Arrangements for deflecting ray or beam
- H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
-
- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/56—Correction of beam optics
- H01J2229/568—Correction of beam optics using supplementary correction devices
- H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
- H01J2229/5682—Permanently magnetised materials, e.g. permanent magnets
Definitions
- the invention relates to a cathode ray tube with a glass bulb, which consists of a funnel-like expanded part and a piston head which closes the latter and is provided on the inside with a luminous layer.
- This so-called cushion distortion arises from the fact that the radius of curvature of the piston crown is larger than the deflection radius, which denotes the distance of the center of deflection of the electron beams from the center of the inner surface of the piston crown.
- circuitry measures can be used to correct a pillow distortion in the vertical direction of the piston head by a so-called north-south correction and a pillow distortion in the horizontal direction by an east-west correction.
- the vertical deflection current is amplitude-modulated with a horizontal-frequency parabola current
- the east-west correction the horizontal deflection current is amplitude-modulated with a vertical-frequency parabola current.
- a cathode ray tube is known from NL-PS 59153, in which permanent magnets are arranged directly on the luminous layer thereof in such a way that trapezoidal distortions are avoided. Pillow distortion is not prevented with this known tube.
- the present invention has for its object a
- means made of permanent or permanent materials are arranged directly on the luminescent layer parallel to its side edges prevents the cushion distortion. The pixel sharpness is not impaired. If a rectangular test image with concave sides appears on the luminescent layer, the means, e.g. B. disc or bar magnets, agnetized by an external magnetic field until the distortions on the luminescent layer disappear. The external magnetic field is then no longer required, since - as is known - permanent or permanent materials keep their magnetic properties after magnetization.
- FIG. 1 shows a simplified illustration of a cathode ray tube and FIG. 2 shows the piston head of the cathode ray tube according to FIG. 1.
- FIG. 1 shows a cathode ray tube which consists of a glass bulb GK, an electron source EQ, a bundling device BE, deflection coils SP and an anode connection AS.
- the glass bulb GK is with a base SO for connection to an electronic circuit, for. B. to a video amplifier, see ver.
- the electron 1 source EQ and the bundling device BE arranged.
- the piston crown KB is provided with a luminescent layer LS on which a conductive layer, e.g. B. an aluminum layer AL is attached, which continues in the funnel-shaped part within the Glaskol- * 5 ben GK and is connected to an anode connection AS.
- the electron source EQ sends an electron beam in the direction of the luminescent layer LS, the bundling device BE concentrating the electron beam and the deflection coils SP deflecting this concentrated electron beam in accordance with the horizontal and vertical pulses (not shown here) in the horizontal and vertical directions.
- the electrons of the electron beam reach the luminescent layer LS and are then removed via the aluminum layer AL to the anode connection AS. 15
- Pincushion distortions on the luminescent layer LS result from the fact that the radius of curvature of the piston crown KB is greater than the deflection radius, the radius of deflection representing the distance from a fictitious center of deflection AM of the electron beams from 20 to the center MI of the inner surface of the piston crown KB.
- magnetized means SM made of permanent or permanent materials, e.g. B. bar magnets are arranged. 25
- FIG. 2 shows the piston crown KB of the cathode ray tube according to FIG. 1.
- Four bar magnets SM which consist of permanent or permanent materials, are arranged directly on the luminescent layer LS parallel to the side edges thereof. It is also possible to use a closed ring made of permanent or permanent material instead of four SM bar magnets.
- the bar magnets SM are attached within the funnel-like part of the glass bulb GK (FIG. 1). This ensures that their magnetic field does not interfere with adjacent monitors. You can fi 35 attached outside of the glass bulb GK; it is therefore possible to retrofit a cathode ray tube with the SM bar magnets in order to eliminate pillow distortion. Suitable measures must be taken to prevent disturbing influences on neighboring monitors.
- Pillow- Distortions on the luminescent layer LS are compensated for by a magnetic field applied to the outside of the cathode ray tube sufficiently magnetizing or, if necessary, demagnetizing the bar magnets until the distortions on the luminescent layer LS disappear. Then the outside
- the bar magnets SM maintain after their magnetization continue to prevent pillow distortion on the light-emitting layer LS.
- the bar magnets must have such a magnetization that their magnetic field compensates for the pillow distortion.
- a magnetic field is applied to the cathode ray tube from the outside, which magnetizes or demagnetizes the bar magnets, such that the cushion distortions are eliminated when the external magnetic field is switched off.
- the bar magnets must be made of a material with a sufficiently high remanence.
- the coercive force should also be large so that the magnetic field remains constant over a long period even under the effect of weak magnetic fields.
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9015726U DE9015726U1 (de) | 1990-11-16 | 1990-11-16 | Kathodenstrahlröhre |
DE9015726U | 1990-11-16 | ||
PCT/DE1991/000850 WO1992009096A1 (de) | 1990-11-16 | 1991-10-31 | Kathodenstrahlröhre |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0511333A1 true EP0511333A1 (de) | 1992-11-04 |
EP0511333B1 EP0511333B1 (de) | 1995-08-02 |
Family
ID=6859438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91918207A Expired - Lifetime EP0511333B1 (de) | 1990-11-16 | 1991-10-31 | Kathodenstrahlröhre |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0511333B1 (de) |
DE (2) | DE9015726U1 (de) |
WO (1) | WO1992009096A1 (de) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE910668C (de) * | 1939-05-14 | 1954-05-06 | Telefunken Gmbh | Bildentzerrungseinrichtung bei Fernsehkathodenstrahlroehren |
DE1199891B (de) * | 1960-03-31 | 1965-09-02 | Telefunken Patent | Anordnung zur magnetischen Ablenkung von Kathodenstrahlen in Kathodenstrahlroehren |
GB1521299A (en) * | 1975-10-24 | 1978-08-16 | Ferranti Ltd | Cathode ray tube assemblies |
-
1990
- 1990-11-16 DE DE9015726U patent/DE9015726U1/de not_active Expired - Lifetime
-
1991
- 1991-10-31 WO PCT/DE1991/000850 patent/WO1992009096A1/de active IP Right Grant
- 1991-10-31 EP EP91918207A patent/EP0511333B1/de not_active Expired - Lifetime
- 1991-10-31 DE DE59106165T patent/DE59106165D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9209096A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1992009096A1 (de) | 1992-05-29 |
DE59106165D1 (de) | 1995-09-07 |
EP0511333B1 (de) | 1995-08-02 |
DE9015726U1 (de) | 1991-12-19 |
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Legal Events
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