MXPA97005672A - Yugo deflec fastening device - Google Patents

Abstract

The present invention relates to an electronic beam baffle device for cathode ray tubes comprising a pair of vertical deviating coils (4), a pair of horizontal deviating coils (3). At least one of said vertical deviating coils (4) and said horizontal deviating coils (3) has a seat shape. A rigid separator (2) supports the pairs of deviating coils (3, 4) and isolate one from the other. A fastening element (21) is coupled to the spacer (2) to secure the spacer (2) to a neck portion of the tube (8). the fixing element (21) has a position on the neck (8) and extends within a region (12) under the pair of vertical deflection coils (

Description

YUGO DEFLECTOR BRAKE DEVICE This invention relates to an electron beam deflector system for cathode ray tubes and in particular to a device for securing the immobilization of said system on the neck of the tube. Said baffle system, also called baffle or deflector yoke assembly generally comprises a pair of vertical deflection coils, a pair of horizontal deflection coils and a ring essentially in the shape of a truncated cone of magnetic material intended to concentrate the flow created by the coils . Horizontal deviating coils are generally in the form of a seat; The vertical deflection coils may also have the seat shape or they may be formed as a toroidal winding around a ring of magnetic material. The two pairs of deviating coils are electrically isolated by a separator, generally of plastic material. In addition to the separator providing mechanical rigidity for the baffle device, it allows the placement of the coils in relation to one another and facilitates the adjustment of the assembled unit on the neck of the tube. The separator comprises a main body and, one or more parts essentially in the form of a funnel, with a flexible back that joins the neck of the tube to allow the baffle system to be secured on the longitudinal axis or Z axis of the tube. This tube neck attachment is usually achieved by a collar or a clamp placed around the flexible back of the separator During the assembly of the components that comprise the deflector, the deviating coils are installed in the separator and placed with each other to allow the generation of vertical and horizontal deflection fields, in accordance with the tube cathode ray with which the baffle is intended to operate The deflector is located then on the neck of the tube and placed along the axis Z of the tube so that in the absence of deviating fields, the three electronic beams generated by the electronic cannon converge on the CRT screen. The deflector is held in this position generally by means of the collar or locking clamp placed in the rear annular part of the separator The annular part of the separator is designed to have the necessary flexibility to facilitate the sliding introduction of the deflector into the neck of the tube and the subsequent locking thereof. However, this method of Fastening the yoke assembly requires that the outer annular surface of the separator at the rear end of the diverting coils extends beyond the coils to provide the necessary flexible area for fastening after adjustment of the Z axis. Therefore the length of the yoke can influence the other components of the neck and the neck length of your The bearing lengths of the tube neck and the yoke assembly are of particular importance with the baffles having vertical seat-shaped deviating coils that extend further along the Z-axis than the toroidal winding coils. In addition, since the trend in the design of the current television receivers is directed to a reduction in the overall size and, since the overall dimensions are largely determined by the cathode ray tube, the depth of the receiver can be reduced for the use of CRTs with shorter neck lengths which therefore require yoke assemblies with a similar length reduction. The length of the baffle can be reduced in accordance with an inventive arrangement wherein an electronic beam deflection device for cathode ray tubes comprises a pair of vertical deflection coils and a pair of horizontal deflection coils, where at least one of the vertical deflection coils and the horizontal deflection coils has a shape A rigid spacer supports the pairs of deviating coils and isolates one from another A fastener is coupled to the spacer to secure the spacer to a neck portion of the tube The fastener has a position on the neck and extends into a region under the pair of vertical diverting coils In the drawings Figure 1 shows a cross-sectional view of a deflector device placed on a cathode ray tube Figure 2 shows a cut-away drawing of a deflector device including an inventive arrangement, Figure 3 shows an inventive clamping device for securing the baffle to the neck of the tube, Figure 4 shows a sectional view along the Z axis of the rear part of the spacer including an inventive arrangement, Figure 5 shows a Additional arrangement for securing the inventive locking device, Figure 6 illustrates in a cropped view, another advantageous embodiment for securing the deflector to the neck of the tube A cathode ray tube 6 with the deflecting yoke assembly is illustrated in section by Figure 1 The baffle yoke assembly also called deflector, includes a pair of horizontal deviating coils in the form of seat 3, a pair of vertical deviating coils 4 also in the form of a seat and isolated from the pair of horizontal deviating coils by means of a separator 2 A ring of material ferromagnetic 5 is placed around coils 3 and 4 The deflector yoke assembly is mounted on the co 8 of a cathode ray tube 6, for deflecting the electronic beams from the electronic cannon 7, along the X and Y axes to create a format on the screen surface 9 During the assembly of the deflector elements the deviating coils they are placed on the body of the separator and its relative positioning adjusted to generate deviating fields of the desired conformation. After this adjustment the coils must remain in place until the subsequent immobilization step on the separator, generally achieving it by adhesion of the coils to the separator body. The baffle is then installed on the tube neck 8 in a precise position of the Z axis to regulate the position of the vertical and horizontal deflection centers. After this adjustment the deflector is secured to the neck of the tube by a locking collar 11 placed on the rear part 10 of the separator. The locking collar 11 exerts an essentially radial force pressing the part 10 against the neck of the tube. In the case where the horizontal and vertical deviating coils 3 are in the form of a seat, their respective lengths along the Z axis are essentially equal. The separator 2 displaces the bobbins 4 relative to the coils 3 so that the rear part of the deviating coils extends more towards the cylindrical or barrel end of the tube than the horizontal deviating coils. When the vertical deflection coils are toroidal and wound around the ring of magnetic material 5, the length of the vertical deflection windings is just greater than the length along the Z axis of the ring 5. It may be that for the requirements related to the For the performance search, the length of the ring 5 is such that the rear part of the vertical deflection coils extends towards the cylindrical end of the tube and beyond the horizontal deflection coils. In order to shorten the length of the deflector, an inventive fastening mode uses a driver-free space 13, in the part under the rear end of the vertical deflection coils 4 and in the rear part of the horizontal deflection coils 3. In accordance with the invention, the area of action of the fastening element 21, the which secures the baffle to the neck of the tube, can be located to extend within the driver's free space 13. The F Figure 3 illustrates the inventive fastening element 21 which can be considered to comprise at least two parts: a first part comprising an annular ring 23, which provides the mechanical fastening of the element 21 to the yoke spacer, and a second part 22, designed to provide circumferential attachment of the spacer to the neck of the tube. The part 22 can be considered to be formed as a perforated or sawed truncated hollow cone with radial openings 31, which create a series of teeth 31. The inner surface of the ring-shaped cone is cylindrical, which has a diameter 35 slightly larger than the diameter of the neck of the tube. The connecting element is, for example, an annular collar 23 punctured with the openings 24 in a direction parallel to the axis of revolution of the ring 22. Figure 2 is an example of implementation of the invention using an advantageous fastening or locking element illustrated by the Figure 3 The separator 2 is formed with a cylindrical end that terminates in a flange or collar 25 The collar 25 contains at least two openings 26, diametrically opposed and located to confront the openings 24 in the collar 23 of the fastener The inner surface of the cylindrical end of the separator 2 is formed as an annular ring 20 with an internal bore as truncated defining a conical surface 28. After adjustment of the Z axis, the yoke / spacer assembly is secured to the neck of the tube by the sliding insert of the element 21 on the neck towards the deflector assembly. The truncated serrated cone 22 of the element 21 penetrates the free space 12 located between the separator and the neck of the tube, under the rear part of the vertical deflection coils 4 The conical shape element 22 slides under and engages with the conical surface 28 of the annular ring or shoulder 20 Since the conical surfaces 27 and 28 of the respective parts 21 and 20 with complementary, the surfaces make contact with each other The sliding insert of the locking element 21 within the annular ring / shoulder 20 deforms the flexible teeth 30 radially to press against and hold the surface 8 of the neck of the tube Therefore the rear part of the deflector assembly is secured by means of contact between the teeth 30 and the neck of the tube 8 Figure 6 shows a partial sectional view through the tube and the spacer end illustrating an alternate inventive mode where the shape of the contact area of the annular ring / shoulder 20 not is complementary to the shape of the part 22 In Figure 6 the annular ring / shoulder 20 is formed with a semicircular cross section The sliding insert of the locking element 21, as described with respect to Figure 2, will result in the ring / The shoulder 20 contacts and deflects the flexible part 22, essentially a serrated cone, against the glass surface of the tube. Therefore, the deflector assembly is secured by the locking effect of the frictional contact. During the sliding insertion, the part 21 can be rotated over the neck of the tube to align the openings 24 of the collar 23 with the openings 26 formed in the flange surface 25 The immobilization of the deflector on the neck is made permanent by securing the element 21 to the separator by means of screws 39 coupling with the threaded openings In a further inventive embodiment, illustrated in Figure 5, pins or pins 51 are formed as part of the body of separator 2 and extend towards the rear of the latter in a direction parallel to the axis Z Those pins or pins are designed to be coupled or inserted within pressure washers 52 placed in the openings 24 of the annular ring or collar 23 of the element 21 The shape of the pressure washer 52 is such that the pin 51 can not be removed or removed after insertion by permanently securing the fastener 21 to the spacer 2. The inventive use of the pin 51 and the pressure washer 52 to secure the element 21 advantageously facilitates an individual operation that combines the sliding insert of the element 21 within the deflector assembly and secures the deflector assembly to the neck of the tube. The annular ring or shoulder 20 of the separator 2 can be formed as a monoblock or integral part of, for example, plastic material injection molded to produce the separator. Alternatively the annular ring may be a separate part and, for example, adhered or ultrasonically welded to the separator. In the latter case the material may differ from that of the separator and may be selected as a function of its own qualities., the saws or channels 40 can be formed on the surface 28 to reduce the mass of the annular shoulder 20. The fastening element 21 can be formed as a monobloc structure by injection molding a plastic material. In an alternative implementation mode the element 21 can be formed from at least two pieces of different material In the latter case the material comprising the collar 23 can be selected for those qualities of high mechanical rigidity, for example plastic or metal, in so much that the material of the part 22 may be, for example, rubber or silicon, selected for flexibility and / or to improve the functional contact with the glass neck to prevent any detachment after immobilization

Claims (10)

1 An electronic beam deflector device for cathode ray tubes comprising a pair of vertical deflection coils (4), a pair of horizontal deflection coils (3), wherein at least one of said vertical deflection coils (4) and said Horizontal deviating coils (3) have a seat shape, a rigid spacer (2) to support the pairs of deviating coils (3, 4) and isolate one from the other, characterized by a fastening element (21) coupled to the separator (2). ) to secure the separator (2) to a neck of the tube (8) of said tube, the fixing element (21) having a position on the neck (8) and extending within a region (12) under the torque of vertical deviating coils (4) The device of claim 1, characterized in that the fastening element (21) comprises a hollow truncated cone (22) that makes contact with a surface (20) of the separator (2)

3 The device of claim 1, characterized in that the fastening element is deformable in a direction substantially radial to the Z axis of said neck

4 The device of claim 1 characterized in that the fastening element (21) comprises at least two different materials

5. The device of claim 2, characterized in that the hollow truncated cone (22) is serrated (31) substantially radially towards a Z axis of the neck (8).

The device of claim 1, characterized in that the surface (20) of the spacer (2) includes saws (40) substantially radial to the Z axis of the neck (8).

The device of claim 1, wherein the spacer has a substantially hollow cone shape.

The device of claim 3, characterized in that the fastening element (21) is deformable to grip the neck (8) circumference I mind.

The device of claim 1, characterized in that the fixing element (21) is connected to the separator (2) by means of a plug (51) coupled with a pressure washer (52).

10. An electron beam deflector assembly for a cathode ray tube comprises: a pair of horizontal deflection coils (3) and a pair of vertical deflection coils (4) which are placed on a separator (2), wherein one of said pairs of deviating coils (3, 4) are formed in the shape of a seat; the separator (2), the horizontal and vertical deflection coils (3, 4) are slidably aligned on a neck portion (8) of a cathode ray tube; characterized by fastener means (21) having a hollow conical saw shape (22) which are slidably mounted on the neck portion (8) of the cathode ray tube so that the serrated conical shape (22) makes contact with the separator ( 2) for flexible deformation against the neck portion (8) to secure the separator (2) in the aligned position. The electronic beam deflector assembly of claim 10, characterized in that the clamping means (21) is attached to the spacer (2) by a pin (51) coupled with a pressure washer (52). The electronic beam baffle assembly of claim 10, characterized in that the conical sawn shape (22) is deformable to grasp the neck (8) circumferentially.