GB1586100A

GB1586100A - Mounting and adjusting a deflection coil holder for a colour picture tube

Info

Publication number: GB1586100A
Application number: GB3811577A
Authority: GB
Original assignee: International Standard Electric Corp
Current assignee: International Standard Electric Corp
Priority date: 1976-09-17
Filing date: 1977-09-13
Publication date: 1981-03-18
Also published as: JPS5351920A; DE2641847A1; NL7709820A; BE858822A; JPS5747543B2; FI66099B; FR2365207B1; FI772639A; IT1084736B; FI66099C; FR2365207A1

Description

(54) MOUNTING AND ADJUSTING A DEFLECTION-COIL HOLDER FOR A COLOUR PICTURE TUBE (71) We, INTERNATIONAL STAN DARD ELECTRIC CORPORATION, a Corporation organised and existing under the Laws of the State of Delaware, United States of America of 320 Park Avenue, New York 22, State of New York, United States of America, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: The present invention relates to an arrangement for mounting and adjusting a deflection-coil holder for a colour picture tube, and more particularly for a colour picture tube of the shadow-mask type, said holder substantially holding in position a ferrite toroidal core and two pairs of coils, one for horizontal and one for vertical deflection, in which the mounting member is secured to the conical portion of the picture-tube envelope.

Such arrangements are known, for example, from the German Printed Patent Application (DT-AS) 22 24 702. According to this publication, a ring-shaped mounting member is bonded to the conical portion of the picture-tube envelope with the aid of a first adhesive. On this mounting member there are provided at least three stay bolts engaging corresponding openings in the deflection-coil holder. Following the adjustment, the spaces remaining in the openings are filled with a second adhesive.

According to one modification of this arrangement, it is proposed that in the ringshaped mounting member, additionally the heads of at least three screws are fixed as well with the aid of the first adhesive, with the screw shafts thereof then serving as threaded bolts with the aid of which the adjustment is carried out by means of knurled adjusting wheels and nuts, with the effected adjustment also in this case being fixed with the aid of a second adhesive.

In both cases it is not possible to detach the ring-shaped mounting member and more especially the deflection-coil holder with the deflection system after the adjustment has been carried out and following the bonding, without damaging or destroying at least a part of the envelope, or to separate the parts from one another. This, however, is desirable in view of the high prices of the picture-tube envelopes, in order to be able to reuse the envelope in cases where it has been found to be faulty.

Moreover, a bonding operation causes intervals during the production process, because after each bonding operation it is necessary to wait until the adhesive has become sufficiently solidified and cured.

According to the present invention there is provided an arrangement for mounting and adjusting a deflection-coil holder for a colour-picture tube comprising: a mounting member connected to the conical portion of an envelope of said tube; and means for removably securing the deflection-coil holder to the mounting member the means comprising at least one carrier sleeve secured to said mount ing member; a guide groove in said deflection-coil holder; an expansible dowel floatingly retained in said guide groove and penetrating the bore in said carrier sleeve, said expan sible dowel being attached to said deflection-coil holder; and a screw to be screwed into said expan sible dowel whereby tightening of said screw locks the depth of penetration of said dowel into the bore of the carrier sleeve and also fixes the position of the dowel in the guide groove of the deflection-coil holder.

The invention will become more apparent by reference to the following description taken in conjunction with the accompanying drawing, in which: Figure 1 shows an arrangement according to an embodiment of the present invention for mounting and adjusting a deflection-coil holder serving to hold in position the deflection coils, i.e. as a side view in the left half of the drawing and as a cross-sectional view in the right-hand half of the drawing, Figure 2 is a cross-sectional view showing a carrier sleeve as attached to the mounting member, with an expansible dowel inserted, Figure 3 shows a cross-sectional view of the carrier sleeve with the expansible dowel inserted, the head of the dowel being modified and designed as a segment of a ball joint, and Figure 4 shows parts of Figure 3 in greater detail.

Identical parts in the drawing are indicated by the same reference numerals.

Referring now to Figure 1, there is shown a deflection system employing the arrangement for mounting and adjusting the deflection-coil holder including the toroidal core and the two pairs of coils, one for horizontal and one for vertical deflection.

In the left-hand half of the drawing this arrangement is shown in a side view, and as a cross-sectional view in the right-hand half. The reference numeral 1 indicates a section taken through the conical portion of the picture-tube envelope whose outlines are shown at three points in the left-hand half of the drawing. The reference numeral 2 indicates the deflection-coil holder for the ferrite toroidal core including the pairs of coils for the horizontal and the vertical deflection, and the reference numeral 3 indicates the mounting member provided with carrier sleeves 4, the bores of which are engaged by expansible dowels 6.By turning a screw 7 into the expansible dowel 6 the slotted lower part of the expansible dowel 6 is caused to expand and the piston-ring type wall thickenings 10 as provided on its outer surface, are firmly forced against the wall of the bore inside the carrier sleeve 4, thus fixing the position of the expansible dowel 6 inside the sleeve 4. This slotted lower part of the dowel continues into a non-slotted smooth portion 11. The diameter of this non-slotted portion 11 of the dowel is so dimensioned that this portion will slidably fit inside the bore of the sleeve 4. In order to avoid a tilting of the dowel 6 inside the sleeve 4, care will have to be taken that this nonslotted portion 11, similar to a cylinder guide, penetrates sufficiently deep into the bore of the sleeve 4.At the end of the smooth portion 11 there is provided a head 8 with the aid of which the dowel 6 is capable of being displaced in a guide groove 5 in a way resembling a T-slot, inside the deflection-coil holder 2. Relative thereto, and as shown in Figure 2, the head 8 may be designed to have the shape of a circular ring plate, but may also, as is shown in Figures 3 and 4, have the shape of a spherical segment which then, together with corresponding discs 9 having spherical shell surfaces, form a ball joint. When in the guide groove 5, the head 8 either designed to have the shape of a circular ring plate or, together with two of the discs 9 and designed as a ball joint, has so much lateral play as to allow a sufficient displacement of the deflection-coil holder in one plane extending perpendicular to the picture-tube axis.In cases where a displacement has to be performed in a sloping plane, it is appropriate to use the dowels 6 according to Figures 3 and 4 even though in the case of small angles of inclination, an adjustment should be possible also with the aid of the dowels according to Figure 2.

In its adjusted position the deflection-coil holder 2 is fixed by tightening the screws 7.

In the embodiment according to Figure 2 the circular ring plate shaped head 8 is pressed against the wall of the deflectioncoil holder by means of the screw and a washer placed beneath the head thereof, and is thus fixed in position. In the embodiment according to Figures 3 and 4, the head of the screw 7, as a supporting surface, is provided with a spherical or ball-shaped surface resting in a further disc 9 comprising a corresponding spherical cup-shaped surface, so that by way of clamping, the ball joint and, consequently, also the deflection-coil holder is fixed in its adjusted position.During the hitherto described fixing with the aid of the screw 7, an adjustment may be effected in the direction of the picture-tube axis by either lowering or lifting the dowels 6 in the sleeves 4, as well as perpendicularly in relation thereto by utilizing the clearance of the heads 8 of the dowels 6 in the guide groove 5. Both adjusting processes, if so required may also be carried out separately, in that the adjustment is performed first in the direction of the picture-tube axis, with this adjustment then being fixed by screwing headless screws into the slotted portions of the dowels 6. Thereafter, the adjustment may be carried out perpendicularly in relation to the picture-tube axis, and then fixed by tightening correspondingly shorter head screws 7 which now only enter the non-slotted shaft portion 11.

WHAT WE CLAIM IS: 1. An arrangement for mounting and adjusting a deflection-coil holder for a colour-picture tube comprising: a mounting member connected to the conical portion of an envelope of said tube; and means for removably securing the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. invention for mounting and adjusting a deflection-coil holder serving to hold in position the deflection coils, i.e. as a side view in the left half of the drawing and as a cross-sectional view in the right-hand half of the drawing, Figure 2 is a cross-sectional view showing a carrier sleeve as attached to the mounting member, with an expansible dowel inserted, Figure 3 shows a cross-sectional view of the carrier sleeve with the expansible dowel inserted, the head of the dowel being modified and designed as a segment of a ball joint, and Figure 4 shows parts of Figure 3 in greater detail. Identical parts in the drawing are indicated by the same reference numerals. Referring now to Figure 1, there is shown a deflection system employing the arrangement for mounting and adjusting the deflection-coil holder including the toroidal core and the two pairs of coils, one for horizontal and one for vertical deflection. In the left-hand half of the drawing this arrangement is shown in a side view, and as a cross-sectional view in the right-hand half. The reference numeral 1 indicates a section taken through the conical portion of the picture-tube envelope whose outlines are shown at three points in the left-hand half of the drawing. The reference numeral 2 indicates the deflection-coil holder for the ferrite toroidal core including the pairs of coils for the horizontal and the vertical deflection, and the reference numeral 3 indicates the mounting member provided with carrier sleeves 4, the bores of which are engaged by expansible dowels 6.By turning a screw 7 into the expansible dowel 6 the slotted lower part of the expansible dowel 6 is caused to expand and the piston-ring type wall thickenings 10 as provided on its outer surface, are firmly forced against the wall of the bore inside the carrier sleeve 4, thus fixing the position of the expansible dowel 6 inside the sleeve 4. This slotted lower part of the dowel continues into a non-slotted smooth portion 11. The diameter of this non-slotted portion 11 of the dowel is so dimensioned that this portion will slidably fit inside the bore of the sleeve 4. In order to avoid a tilting of the dowel 6 inside the sleeve 4, care will have to be taken that this nonslotted portion 11, similar to a cylinder guide, penetrates sufficiently deep into the bore of the sleeve 4.At the end of the smooth portion 11 there is provided a head 8 with the aid of which the dowel 6 is capable of being displaced in a guide groove 5 in a way resembling a T-slot, inside the deflection-coil holder 2. Relative thereto, and as shown in Figure 2, the head 8 may be designed to have the shape of a circular ring plate, but may also, as is shown in Figures 3 and 4, have the shape of a spherical segment which then, together with corresponding discs 9 having spherical shell surfaces, form a ball joint. When in the guide groove 5, the head 8 either designed to have the shape of a circular ring plate or, together with two of the discs 9 and designed as a ball joint, has so much lateral play as to allow a sufficient displacement of the deflection-coil holder in one plane extending perpendicular to the picture-tube axis.In cases where a displacement has to be performed in a sloping plane, it is appropriate to use the dowels 6 according to Figures 3 and 4 even though in the case of small angles of inclination, an adjustment should be possible also with the aid of the dowels according to Figure 2. In its adjusted position the deflection-coil holder 2 is fixed by tightening the screws 7. In the embodiment according to Figure 2 the circular ring plate shaped head 8 is pressed against the wall of the deflectioncoil holder by means of the screw and a washer placed beneath the head thereof, and is thus fixed in position. In the embodiment according to Figures 3 and 4, the head of the screw 7, as a supporting surface, is provided with a spherical or ball-shaped surface resting in a further disc 9 comprising a corresponding spherical cup-shaped surface, so that by way of clamping, the ball joint and, consequently, also the deflection-coil holder is fixed in its adjusted position.During the hitherto described fixing with the aid of the screw 7, an adjustment may be effected in the direction of the picture-tube axis by either lowering or lifting the dowels 6 in the sleeves 4, as well as perpendicularly in relation thereto by utilizing the clearance of the heads 8 of the dowels 6 in the guide groove 5. Both adjusting processes, if so required may also be carried out separately, in that the adjustment is performed first in the direction of the picture-tube axis, with this adjustment then being fixed by screwing headless screws into the slotted portions of the dowels 6. Thereafter, the adjustment may be carried out perpendicularly in relation to the picture-tube axis, and then fixed by tightening correspondingly shorter head screws 7 which now only enter the non-slotted shaft portion 11. WHAT WE CLAIM IS:

1. An arrangement for mounting and adjusting a deflection-coil holder for a colour-picture tube comprising: a mounting member connected to the conical portion of an envelope of said tube; and means for removably securing the

deflection-coil holder to the mounting member the means comprising at least one carrier sleeve secured to said mounting member; a guide groove in said deflection-coil holder; an expansible dowel floatingly retained in said guide groove and penetrating the bore in said carrier sleeve, said expansible dowel being attached to said deflection coil holder; and a screw to be screwed into said expan sible dowel whereby tightening of said screw locks the depth of penetration of said dowel into the bore of the carrier sleeve and also fixes the position of the dowel in the guide groove of the deflection-coil holder.

2. An arrangement according to claim 1, wherein the expansible dowel includes a head on the end thereof adjacent said screw.

3. An arrangement according to claim 2, wherein said head is a circular ring plate which aids in clamping the expansible dowel to the deflection-coil holder upon tightening the screw.

4. An arrangement according to claim 2, wherein the head is a spherical segment; and the screw is provided with a spherical surface; and further including a pair of discs each provided with a hollow spherical surface to form a ball joint with the spherical surface of the head and a further disc provided with a hollow spherical surface to form a ball joint with the spherical surface of the screw, the ball joints being maintained in position by tightening the screw, thus firmly clamping the expansible dowel to said deflection-coil holder.

5. An arrangement according to any preceding claim, wherein the expansible dowel includes a non-slotted smooth portion having an outer diameter cooperating with the diameter of the bore inside said carrier sleeve, the diameters being chosen to be in such a relation to each other as to result in said smooth portion acting as a cylinder guide when said smooth portion enters into the bore of said carrier sleeve.

6. An arrangement according to any preceding claim wherein said means comprises three such carrier sleeves each with its associated expansible dowel, screw and guide groove in the deflection-coil holder.

7. An arrangement substantially as hereinbefore described with reference to and as illustrated in Figures 1 and 2, modified or not by Figures 3 and 4 of the accompanying drawing.

8. A colour picture tube provided with a mounting and adjusting arrangement according to any preceding claim.