U.S. Philips Corporation

Adriaan J Groothoff

Albertus A Sluyterman

Nicolaas G Vink

Gerrit Bosch

Halbe Osinga

Fransiscus M Doomernik

Martin Clemens Van Der Heijde

Johannes Aloysius Van Leeuwen

Constantius Johannes Panis

Marcellis H Driessen

Dik R Overdijk

Adrianus M Habraken

Jacob Van Maastricht

The invention relates to a deflection unit (4) of a picture tube, the deflection unit (4) comprising a coil holder (5) and a cylindrical connection member (6) with elastic tongues. The cylindrical connection member (6) is flexibly connected to the coil holder by means of connection members (14) so that in a simple way the coil holder is tiltable around two mutually perpendicular axes which are each perpendicular to the longitudinal axis (12) of the coil holder (5).

Picture tube having an electro-magnetic deflection unit

Picture display device having a display tube (3) and a deflection unit (9) comprising a field deflection coil and a line deflection coil (11). To comply with a predetermined interference radiation standard, the picture display device comprises a first set of (horizontal) interference suppression coils 18, 19 arranged symmetrically relative to the plane of symmetry of the line deflection coil and a second set of (vertical) interference suppression coils 18a, 19a arranged at right angles to the plane of symmetry of the line deflection coil, which coils are oriented in such manner and in operation are energizable in such manner that, measured at a predetermined distance from the picture display device, at least the strength of the local magnetic dipole field is below a desired standard. Each coil of the second set preferably comprises at least two sub-coils arranged parallel to each other at a given distance in order to reduce the energy content of the coil system.

Picture display device having means for compensating line stray fields

A pair of saddle-shaped deflection coils are wound in a jig and are then assembled with other components. During winding the coil an electrically insulating support having electrically conductive connection points for the coil terminators is used, the terminators being connected to the connection points after winding.

Method of manufacturing an electromagnetic deflection unit

An electro-magnetic deflection coil with a flangeless narrow end is wound against the inside of a funnel-shaped support 14. The support 14 opposite the windows of the coil parts 19 has recesses 25 through which axially extending guide elements 26, 27 are passed inwards during the winding process in order to support the circumferentially extending turn segments of the coil parts 19 on the rear side. After winding, each coil part 19 is formed to a coherent unit by means of a thermal treatment and the guide elements 26, 27 are removed.

Method of manufacturing an electro-magnetic deflection unit for a

The deflection coil system (7) comprises a synthetic resin support (9) which on its outside is surrounded by an annular ferromagnetic core (19) having toroidal deflection coils (21). On the rear portion (11) of the support (9) outwardly directed resilient members (23) which extend approximately perpendicularly to the axis (25) of the support are formed having on their forwardly directed side a face (27) which is inclined with respect to said axis. The faces (27) engage the rear side of the core (19) so that each member (23) on the core on the one hand exerts a radially outwardly directed force (29) centering the core with respect to the axis (25) and on the other hand an axially forwardly directed force (31) urging the core against an abutment (33) on the front of the support (9). Separate components for positioning the core (9) are hence not necessary. If desired the core (19) after assembly may be permanently connected to the support (9) by means of a few drops of adhesive (35).

Deflection coil system for a picture display tube

A hollow coil support for an electromagnetic deflection unit adapted to surround a part of a cathode-ray tube, the inside of the support carrying a deflection coil wound directly thereon, the support at each of its respective ends having a slotted annular member with groups of turns longitudinally extending from the slots in one annular member to the slots in the other annular member, and means provided between the ends of the support for locally supporting the longitudinal group of turns such that they are free from engagement with the inner surface of the support.

Coil support for an electromagnetic deflection unit

In a television deflection device which is mounted on a color cathode ray tube, a frustoconical supporting member (3) has a pair of coil halves (6) and (7) which form horizontal deflection coils halves. These coils have longitudinal portions (11, 12, 14 and 15) which extend to the front and the rear of the supporting member (3), an elongate tapered spacer (17) and (18) being inserted in the spaces between adjacent longitudinal portions of these coils. Movements of the spacers (17) and (18) adjust the space between the longitudinal portions which provides mechanical means for correcting for asymmetries in the display device.

Color display tube having a deflection device and deflection device for

Before mounting, coils heads comprising clearly defined faces and edges are formed on deflection coils by moulding. The sides of the flared portion of the coils are also clearly defined by the same operation. After mounting, the coil bears in the coil holder by way of the faces and edges formed. The sides of the flared portion abut against projections formed on the coil holder. The flared portion is completely clear from the coil holder.

Deflection unit for color television display tubes

In a picture display tubes having deflection angles of 110.degree. and more the conical central part near the transition to the neck has a substantially flat variation perpendicular to the tube axis. As a result of this an accurate positioning of the deflection device on the display tube is seriously hampered. This problem is solved by centering members which are present on the conical central part and which cooperate in a self-centering manner with centering members forming part of the supporting cage of the deflection device. The position of the deflection device in the axial direction is accurately fixed by abutment members forming part of the supporting cage in co-operation with abutment surfaces forming part of the envelope of the tube.

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Eindhoven, Netherlands

Adriaan J Groothoff