Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1996-05-28
1997-12-09
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313425, 335210, 335212, 348829, H01J 2970, H01F 700
Patent
active
056964250
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a deflection yoke assembly, and more particularly to such an assembly including adjustable studs about the front face of a deflection yoke for adjusting the alignment of the deflection yoke with respect to its associated cathode ray tube (CRT).
The importance of providing a deflection yoke assembly with a mechanism for permitting the yoke assembly to be adjusted relative to its orientation to an associated CRT upon which it is mounted is well known in the art.
With reference to FIG. 1, a prior art deflection yoke assembly includes a forwardmost mounting ring 22 including multiple inclined mounting studs or sleeves 24 substantially equally spaced from one another around the outer circumference of the mounting ring 22. Sleeves 24 and ring 22 are made in the same molding process as one piece. Hollow bolts 26 are threadably mounted in the mounting sleeves 24. The front or forward ends of the bolts 26 each include a contact head 28 for contacting a cone or funnel 32 of an associated CRT. Windings 30 of the deflection coil assembly 20 as shown, can be of any desired pattern.
Also shown affixed to the deflection yoke or coil assembly 20 are a standoff panel 34, and a wiring terminal ring 36 at the rear portion thereof. A sheath beam bender 38 is also shown, along with the rearmost portion 40 of the CRT. The angle of the inclined mounting sleeves 24 is predetermined to insure that contact heads 28 of hollow bolts 26 make contact with a maximum area of cone 32 of the associated CRT. Since contact head 28 of a given hollow bolt 26 has a face that is at 90.degree. to the longitudinal axis of such a hollow bolt 26, the angles of each mounting sleeves 24 are such that the longitudinal axis of the hollow bolt 26 is perpendicular to the point where the axes intersect the wall of the cone 32. In this manner, alignment of the deflection of the yoke 20 to the CRT is provided.
The adjustment of hollow bolts 26 tends to be a slow process because the torque, which is applied to turn them, is very critical. Furthermore, when the hollow bolts contact the funnel portion of the tube, they may tend to rotate the yoke with respect to the tube, thus making the alignment of the yoke with respect to the tube less accurate than would be desired.
It has been proposed to use a ratchet arrangement instead of the threaded bolt arrangement shown in FIG. 1. In such a prior art ratchet arrangement, a toothed core is positioned within sleeve 24, which contains a pawl which engages the toothed core, permitting the toothed core to be advanced toward cone 32, but preventing the core from withdrawing from cone 32. This arrangement has not been completely satisfactory because the finite spacing of the teeth of the ratchet provides steps which may leave some space between the cone 32 and the toothed core. As a result, the adjustment of the yoke with respect to the cone of the CRT is not as precise as would be desired.
An inventive feature provides a method for mounting a deflection yoke on the neck and cone or funnel portions of a cathode ray tube, in which the yoke has a front mounting ring for mounting over the funnel structure portion of the cathode ray tube. The mounting ring has a plurality of hollow sleeves, each containing a movable member slideably received therein and movable along its longitudinal axis within a range of positions. Each of the sleeves contains means for continuously unidirectionally restricting the movement of its corresponding movable member along the longitudinal axis of the sleeve to a direction toward the funnel portion of the tube, the unidirectional restriction of said movable member being in substantially infinitesimal steps, so as to position said movable member at substantially any position within said range of positions. The method comprises the steps of placing the yoke in its desired position, with respect to the neck and funnel portions, fixing the rear portion of the yoke to the neck portion, and longitudinally moving each of the movable members within its corresponding sleeve into cont
REFERENCES:
patent: 3986156 (1976-10-01), Smith
patent: 4110793 (1978-08-01), Tajiri
patent: 4117516 (1978-09-01), Yasuhara
patent: 4195315 (1980-03-01), Pytlarz et al.
patent: 4338584 (1982-07-01), Howard
patent: 4360839 (1982-11-01), Ragland, Jr. et al.
patent: 5028898 (1991-07-01), Tsukii et al.
patent: 5185672 (1993-02-01), Rousseau et al.
Laks Joseph J.
Patel Ashok
Sragow Daniel E.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
LandOfFree
Method for mounting a deflection yoke and support structure ther does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for mounting a deflection yoke and support structure ther, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for mounting a deflection yoke and support structure ther will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1610191