EP0408139B1 - Tube image et unité de déviation appropriée à un tel tube image - Google Patents

Tube image et unité de déviation appropriée à un tel tube image Download PDF

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Publication number
EP0408139B1
EP0408139B1 EP19900201839 EP90201839A EP0408139B1 EP 0408139 B1 EP0408139 B1 EP 0408139B1 EP 19900201839 EP19900201839 EP 19900201839 EP 90201839 A EP90201839 A EP 90201839A EP 0408139 B1 EP0408139 B1 EP 0408139B1
Authority
EP
European Patent Office
Prior art keywords
field
display tube
guiding means
deflection
deflection coil
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
Application number
EP19900201839
Other languages
German (de)
English (en)
Other versions
EP0408139A2 (fr
EP0408139A3 (en
Inventor
Alexander Godefridus Johannes G. Van Mierlo
Martinus Antonius Maria Van Den Heuvel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from NL8901820A external-priority patent/NL8901820A/nl
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0408139A2 publication Critical patent/EP0408139A2/fr
Publication of EP0408139A3 publication Critical patent/EP0408139A3/en
Application granted granted Critical
Publication of EP0408139B1 publication Critical patent/EP0408139B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/46—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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only

Definitions

  • the invention relates to a display tube comprising a deflection unit having a carrier, a field deflection coil, a line deflection coil and field-guiding means.
  • the invention further relates to a deflection unit which is suitable for such a display tube.
  • Such a display tube can be used in black and white, colour and projection television, in data-display equipment and in other apparatuses in which a cathode ray tube is used.
  • the deflection unit When the deflection unit is energized it deflects an electron beam generated in the display tube to form an image to be displayed.
  • a display tube of the type described in the opening paragraph is characterized according to the invention in that the field-guiding means are provided in the deflection unit in a manner such that they produce little or no vibration.
  • the invention is based on the insight that the occurrence of undesirable sound can be largely attributed to the fact that the fields generated when the deflection unit is energized cause the field-guiding means to vibrate in an undesirable manner. Said undesirable generation of sound is largely precluded by providing the field-guiding means in a little vibration producing manner according to the invention.
  • a preferred embodiment of a display tube according to the invention is characterized in that the field-guiding means are secured on the carrier and encapsulated in electrically insulating material.
  • the degree to which undesirable vibrations occur is very high. The reason for this being that the forces which are exerted on the field-guiding means when the deflection unit is energized can be so large that the carrier is made to vibrate via the field-guiding means.
  • the carrier acts as a resonance box causing the undesirable sound to be intensified. The vibrations are damped to a sufficient degree by encapsulating the field-guiding means in electrically insulating material.
  • the encapsulation of the field-guiding means takes place by filling the space around said field-guiding means with the electrically insulating material.
  • said electrically insulating material is a curing synthetic resin.
  • Polyurethane foam is particularly suitable because it can be provided in a simple manner.
  • a further preferred embodiment of a display tube according to the invention is characterized in that the field-guiding means are secured to one of the deflection coils. Undesirable vibrations are precluded in that the field-guiding means are not secured to the carrier but to one of the deflection coils, for example the field deflection coil. As a result thereof, the carrier no longer acts as a resonance box.
  • the fixation is preferably carried out using a rapidly curing adhesive, thus obtaining a fast and accurate fixation.
  • a display tube which is characterized in that the field-guiding means comprise two soft magnetic elements which are arranged to produce little vibration, diametrally opposite each other between the field deflection coil and the line deflection coil, substantially parallel to the magnetic field of the field deflection coil, near the centre of the field deflection coil, exhibits an extremely low noise behaviour during the display of an image.
  • the invention further relates to a deflection unit for a display tube, said deflection unit comprising a carrier, a field deflection coil, a line deflection coil and field-guiding means, and is characterized in that the field-guiding means are arranged in the deflection unit so as to produce little vibration.
  • Fig. 1 is a longitudinal sectional view of a display tube 1 comprising a neck portion 2 in which an electron-gun system 3 is mounted, a conical enveloping portion 4 and a display window 5.
  • a deflection unit 7 is mounted on the display tube 1 at the transition from the neck portion 2 to the enveloping portion 4.
  • Said deflection unit 7 comprises a carrier 8 of electrically insulating material having a front end portion 9 and a rear end portion 10.
  • a line deflection coil 11 on the inside of the carrier 8, for generating a (line) deflection field for deflecting electron beams produced by the electron-gun system 3 in the horizontal direction
  • a field deflection coil 12 on the outside of the carrier 8, for generating a (field) deflection field in the vertical direction.
  • Said deflection coils 11 and 12 are surrounded by an annular core 14 of ferromagnetic material.
  • field-guiding means 15 are arranged between the field deflection coil 12 and the line deflection coil 11 by securing them to the carrier 8.
  • the field-guiding means 15 are arranged so as to produce little vibration by encapsulating them in electrically insulating material 16.
  • the material has to be electrically insulating to preclude a short-circuit between the field deflection coil and the line deflection coil. Vibrations, if any, are damped by said electrically insulating material 16.
  • the invention applies, in particular, to field-guiding means 15 which serve to influence the deflection fields in such a manner that a satisfactory astigmatic level with a tolerably small coma can be realised (so-called astigmatism laminations).
  • the space between the field deflection coil 12 and the line deflection coil 11 is filled with a curing synthetic resin 16 at the location of the field-guiding means 15, so that said field-guiding means 15 are efficiently arranged in a vibrationless manner (see Fig. 2).
  • the field-guiding means are preferably formed by two soft magnetic elements 17 and 18 which are arranged diametrally opposite each other, substantially parallel to the magnetic field of the field deflection coil 12.
  • the synthetic resin Before the synthetic resin has cured, it can be provided in the space between the field deflection coil and the line deflection coil in a simple manner.
  • Polyurethane foam is particularly suitable.
  • epoxy resins and suitable adhesives can alternatively be used as electrically insulating materials.
  • the electrically insulating material 16 which surrounds the field-guiding means may have two functions. Firstly, it permits the field-guiding means to be secured in the deflection unit and, secondly, it damps any vibrations. As a result hereof, the occurrence of undesirable sounds in the display tube when an image is displayed is largely precluded.
  • Fig. 3 is a diagrammatic longitudinal sectional view of a deflection unit 7 in which the field-guiding means 15 are secured directly on one of the deflection coils, in this case the line deflection coil 11.
  • a rapidly curing adhesive for example a UV-curing adhesive is used to secure the field-guiding means to the line deflection coil 11.
  • a rapidly curing adhesive for example a UV-curing adhesive is used to secure the field-guiding means to the line deflection coil 11.
  • An additional advantage of securing the field-guiding means on the deflection coils is that in the case of vibrations the positioning of the field-guiding means and the deflection coils relative to each other does not change. Consequently, the electromagnetic fields generated remain unchanged when vibrations occur. Thus, an image to be displayed by the display tube is hardly adversely influenced as a result of undesirable shifts of field-guiding means and deflection coils.

Landscapes

  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Claims (9)

  1. Tube cathodique comprenant une unité de déviation, une bobine de déviation verticale, une bobine de déviation horizontale et des dispositifs de guidage de champ, caractérisé en ce que les dispositifs de guidage de champ sont installés dans l'unité de déviation d'une manière telle qu'ils produisent peu ou pas de vibrations.
  2. Tube cathodique tel que revendiqué dans la revendication 1, caractérisé en ce que les dispositifs de guidage de champ sont fixés sur le support et enrobés de matériau isolant de l'électricité.
  3. Tube cathodique tel que revendiqué dans la revendication 2, caractérisé en ce que l'espace autour des dispositifs de guidage de champ est rempli avec le matériau isolant de l'électricité.
  4. Tube cathodique tel que revendiqué dans les revendications 2 ou 3, caractérisé en ce que le matériau isolant de l'électricité est une résine synthétique durcissable.
  5. Tube cathodique tel que revendiqué dans la revendication 4, caractérisé en ce que la résine synthétique durcissable est de la mousse de polyuréthanne.
  6. Tube cathodique tel que revendiqué dans la revendication 1, caractérisé en ce que les dispositifs de guidage de champ sont fixés sur une des bobines de déviation.
  7. Tube cathodique tel que revendiqué dans la revendication 6, caractérisé en ce que les dispositifs de guidage de champ sont fixés sur une des bobines de déviation au moyen d'une colle à durcissement rapide.
  8. Tube cathodique tel que revendiqué dans l'une quelconque des revendications précédentes, caractérisé en ce que les dispositifs de guidage de champ comprennent deux éléments faiblement magnétiques disposés pour générer peu de vibrations, sont diamétralement opposés l'un à l'autre entre la bobine de déviation verticale et la bobine de déviation horizontale, sont en substance parallèles au champ magnétique de la bobine de déviation, et proches du centre de la bobine de déviation verticale.
  9. Unité de déviation utilisable pour un tube cathodique tel que revendiqué dans l'une quelconque des revendications précédentes, dont l'unité de déviation comprend un support, une bobine de déviation verticale, une bobine de déviation horizontale et des dispositifs de guidage de champ, caractérisée en ce que les dispositifs de guidage de champ sont disposés dans l'unité de déviation pour produire peu de vibrations.
EP19900201839 1989-07-14 1990-07-09 Tube image et unité de déviation appropriée à un tel tube image Expired - Lifetime EP0408139B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL8901820 1989-07-14
NL8901820A NL8901820A (nl) 1989-07-14 1989-07-14 Beeldbuis.
NL9000373A NL9000373A (nl) 1989-07-14 1990-02-16 Beeldbuis en afbuigeenheid geschikt voor zulk een beeldbuis.
NL9000373 1990-02-16

Publications (3)

Publication Number Publication Date
EP0408139A2 EP0408139A2 (fr) 1991-01-16
EP0408139A3 EP0408139A3 (en) 1991-09-11
EP0408139B1 true EP0408139B1 (fr) 1993-10-27

Family

ID=26646554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900201839 Expired - Lifetime EP0408139B1 (fr) 1989-07-14 1990-07-09 Tube image et unité de déviation appropriée à un tel tube image

Country Status (4)

Country Link
EP (1) EP0408139B1 (fr)
JP (1) JP3278692B2 (fr)
DE (1) DE69004171T2 (fr)
NL (1) NL9000373A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1007166A3 (nl) * 1993-05-13 1995-04-11 Philips Electronics Nv Beeldbuis met afbuigeenheid.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8601803A (nl) * 1986-07-10 1988-02-01 Philips Nv Kleurenbeeldbuis met astigmatisme correctiemiddelen.

Also Published As

Publication number Publication date
EP0408139A2 (fr) 1991-01-16
JPH0346736A (ja) 1991-02-28
NL9000373A (nl) 1991-02-01
EP0408139A3 (en) 1991-09-11
JP3278692B2 (ja) 2002-04-30
DE69004171T2 (de) 1994-05-05
DE69004171D1 (de) 1993-12-02

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