US2591820A - Suspension mounting for the focussing device of cathode-ray tubes - Google Patents

Suspension mounting for the focussing device of cathode-ray tubes Download PDF

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Publication number
US2591820A
US2591820A US73347A US7334749A US2591820A US 2591820 A US2591820 A US 2591820A US 73347 A US73347 A US 73347A US 7334749 A US7334749 A US 7334749A US 2591820 A US2591820 A US 2591820A
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US
United States
Prior art keywords
focussing device
focussing
support member
bracket
slot
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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
US73347A
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English (en)
Inventor
Jackson Donald
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.)
Pye Electronic Products Ltd
Original Assignee
Pye Ltd
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
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Publication of US2591820A publication Critical patent/US2591820A/en
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    • 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
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements

Definitions

  • the present invention relates to a suspension mounting for the focussing device of a cathode ray tube, particularly for use in television receivers, whereby the focus coil or focussing magnet may be adjusted so that the raster may assume the desired position upon the screen of the tube.
  • the focussing device is mounted so asto be laterally adjustable, with reference to the axis of the cathode ray tube, intwo directions at-right angles to each other.
  • the centering of a television picture on the screen of the tube is thus effected by laterally moving the focussing device as distinct from ode ray tube, and upon which bracket member is mounted a support member which inturn supports the magnetic focussing device which. may be either a coil or a permanent magnet, through a.
  • the support member being also adjustably connected to the bracket member through a pin and slot connection so that it can be adjusted with respect thereto in a direction transversely with respect to the axis of the iocussing device and substantially at right angles to the direction in which the focussing device is adjustable on the support member.
  • the focussing device can be adjusted in two directions at right angles transversely with respect to the neck of the cathode ray tube, when inserted through the bore of the focussing device, whereby the position of the rastor on the-screen may be adjusted.
  • the focussing device is urged by resilient means, such as a springer block of rubber or like material in one direction in the slots in the support member, a screw or equivalent means carried by a fixed part of the mounting separate from the focussing device being provided for moving the magnet relative to the support member against the action of said resilient means.
  • resilient means such as a springer block of rubber or like material in one direction in the slots in the support member
  • a screw or equivalent means carried by a fixed part of the mounting separate from the focussing device being provided for moving the magnet relative to the support member against the action of said resilient means.
  • the support member is likewise urged either directly or indirectly by similar resilientmeans in one direction with respectto the bracket memher, a further screw or equivalent means being provided for moving the support member relative to the bracket member against the action of the said resilient means.
  • a further screw or equivalent means being provided for moving the support member relative to the bracket member against the action of the said resilient means.
  • a further feature of the invention consists in providing the focussing device with a sleeve which is longitudinally movable within the bore" of the magnet or focus coil in order to adjust the-width of the focussing gap of the focussing device.
  • Fig. l is a sectional side elevation of the mount ing device sectioned on the line l-l of Fig. 2.
  • Fig. 2 is a front elevational View partly insection on the line lI--l l of Fig. 1.
  • Fig. 3 is a rear elevational view
  • Fig. 4' is a plan view partly cut away to show details of the mounting of the'focussing magnet.
  • the focussing device comprises an an-
  • the heads of the two screws like are used. to secure the focussing device to the supporting member l as shown in Fig. 1 to provide a pin and slot connection.
  • This support member I5 is provided with two pins [6 which project through two slots l! in a further metal plate constituting the bracket member 18, which slots extend in a direction at right angles to the direction of the slots M in the support member.
  • the bracket member I8 is provided with a flange l9, around its periphery which extends in the direction of the magnet so as to surround the same.
  • fitted in apertures in this flange which bosses are positioned respectively substantially in line with the two directions of movement of the focussing device and support plate, pass two screws 22, 23 the ends of which engage with the outer periphery of the magnet, or preferably with flat metal members 24 carried by the magnet or one of the clamping members 12, whereby, upon screwing in one or other of the screws 22 or 23, the magnet may be moved in one or other of two directions at right angles by reason of the pin and slot connections above described.
  • two blocks of resilient rubber 25 and 26 are also arranged between the magnet 10, or its clamping members II and I2, and the inner surface of the flange l9, in positions substantially diametrically opposite to the two screws 22 and 23, so that as the magnet is moved by screwing in one of the screws, the opposite rubber block is compressed. ,Upon releasing that screw the rubber block moves the magnet in the opposite direction to keep the flat metal member 24, in engagement with the s end of the screw.
  • the flange I9- around the bracket member l8 may also serve for mounting the bracket member upon the chassis of the apparatus and, for this purpose, is conveniently provided with a flat section 190., as shown.
  • the adjusting screws 22 and 23 may be disposed for adjusting the magnet Ill, vertically and horizontally but are preferably arranged at such angles to the vertical and horizontal that by moving the magnet in these two directions the raster is moved substantially in the horizontal and vertical directions. Experiments show that these directions are approximately to the vertical and horizontal directions respectively.
  • the support and bracket members are, of course, apertured as indicated at 21 and 28 respectively to permit the neck of the cathode ray tube to pass therethrough.
  • the bracket member 18 also carries a further apertured sheet metal stirrup bracket 29 therebehind which is fitted with a rubber grommet 30 for supporting the neck of the cathode ray tube indicated by the dotted lines 3 I. It will be noted that the mounting allows the focussing device to be moved in a plane in two directions mutually at right angles, the plane being transversely with respect to the axis of the annular focussing device and of the tube.
  • the rear annular magnet clamping member Ii is provided with a rearwardly extending tubular portion 32 within which can slide, in telescopic manner, a further tubular member 33 of magnetic material.
  • a further tubular member 33 of magnetic material By moving this member 33 into. or withdrawing it from the bore of the magnet the width of the focussing gap defined between the forward end of this tubular member 33 and the front clamping ring 12, may be varied.
  • This adjustment is preferably effected by providing the outer tubular member 32, with a slot 34, inclined to the axis of the tube, with which a pin 35 projecting from the inner tubular member 33 engages so that, by rotating the inner tubular member, it is simultaneously moved longitudinally.
  • the pin 35 is in the form of a screw which may be tightened to lock the inner tubular member 33, in the adjusted position.
  • the slot 34 is curved so that greater leverage is obtained when the magnetic attraction is the greatest.
  • a suspension mounting for the magnetic focussing device for a cathode ray tube comprising, in combination, a bracket member having an attachment surface, a support member carried by said bracket member, an annular focussing device having an axis substantially parallel to said attachment surface, resilient means urging the focussing device in one direction transversely with respect to the axis of the focussing device, a
  • a suspension mounting for the magnetic focussing device for a cathode ray tube comprising, in combination, a bracket member having an attachment surface, a support member carried by said bracket member, an annular focussing device having an axis substantially parallel to said attachment surface, pin and slot connections between the focussing device and the support member permitting adjustment of the focussing device relatively to the support member in a direction transversely with respect to the axis of the focussing device, pin and slot connections between said supporting member and said bracket permitting adjustment of the support member relatively to the bracket member in a direction at right angles to the direction in which the focussing device is adjustable on the support member, means restricting movement of the focussing device to said directions in a plane transversely with respect to the axis of the focussing device, resilient means urging the focussing device relatively to the bracket member in said directions and screws carried by said bracket member for moving the focussing device against the action of said resilient means in the directions permitted by the pin and slot connections, one of said directions extending at an angle approximately 30 to said
  • a suspension mounting for the magnetic. focussing device for a cathode ray tube comprising, in combination, a bracket member, a support member carried by said bracket member, an annular focussing device having a bore, connecting means between the focussing device and the sup:
  • port member permitting adjustment of the focussing device relatively to the support member in a direction transversely with respect to the axis of the focussing device
  • connecting means between said support member and said bracket permitting adjustment therebetween in a direction transversely with respect to the axis of the focussing device and transversely with respect to the direction in which the focussing device is adjustable relatively to the support member and a sleeve of magnetic material mounted for adjusting movement jointly with the fccussing device and for axial adjustment relative to the :"ocussing device within the bore thereof.
  • a magnetic focussing device for a cathode ray tube comprising an annular iocussing device having a bore and a tubular extension, a sleeve of magnetic material slidable and rotatable in said extension and extending Within said bore, an inclined slot in said extension, screw means on the sleeve extending through and movable along said slot, and means for tightening the screw means against the portions or" the extension adjacent said slot.
  • a suspension mounting for the magnetic focussing device of a cathode ray tube comprising, in combination, a bracket member, a support member, an annular focussing device having a bore and a tubular extension, pin and slot connections between the iocussing device and the support member permitting adjustment of the focussing device relatively to the support member in a direction transversely with respect to the axis of the focussing device, pin and slot connections between said support member and said bracket permitting adjustment therebetween in a direction transversely with respect to the axis of the focussing device and at right angles to the direction in which the focussing device is adjustable relatively to the support member, a sleeve of magnetic material slidable and rotatable in the extension on the focussing device and extending within said bore, a curved inclined slot in said extension and a pin on said sleeve and engaging said slot.
  • a magnetic focussing device for a cathode A ray tube comprising an annular permanent magnet having two parallel end faces and an axial bore extending therebetween, a pole piece of magnetic material extending toward the axis of said magnet from one said end face, a member of magnetic material attached to the other of said end faces and having a tubular extension extending outwardly of said other end face coaxially with said bore, the inner diameter of said extension being less than the diameter of said bore, a sleeve of magnetic material slidable axially and rotatable in said extension so as to extend into said bore and form therein, jointly with said pole piece, a focussing gap, and pinand-slot helical guiding means for positively cor relating the rotary and sliding movements of said sleeve in said extension.
  • a magnetic focussing device for a cathode ray tube comprising an annular permanent magnet having a bore and a tubular extension, a sleeve of magnetic material slidable and rotatable in said extension to form with said extension a pair of telescopic members and extending within said bore to form therein an annular focussing gap, an inclined slot in one of said telescopic members, and a pin carried by the other of said telescopic members and guidingly extending into said slot to enforce a redetermined ratio between the rotary and sliding movements of said sleeve in said extension, the slot being curved so as to progressively increase the said ratio as the sleeve is moved to narrow the focussing gap.
  • a suspension mounting for the magnetic focussing device for a cathode ray tube comprising a bracket having a flat plate-like portion, an aperture in said portion through which the tube may extend, a flange extending normally to said portion at one side thereof, said flange forming an endless wall surrounding said portion, part of said flange being substantially flat to form an attachment surface for the bracket, a substantially plate-like apertured support member, pinand-slot connecting means by which said support member is guided for linear sliding movement on the plate-like portion of said bracket, an annular focussing device including a plate element extending substantially normally to the axis or" the focussing device, pin-and-slot connecting means by which said plate element is guided for linear sliding movement on the support member in a direction transverse to the movement of said member relative to the bracket, two resiliently compressible members interposed between said focussing device and portions of said flange for respectively urging said focussing device in the direction of said two pin-and-slot guiding means, two adjustment screws, and screw

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US73347A 1948-02-07 1949-01-28 Suspension mounting for the focussing device of cathode-ray tubes Expired - Lifetime US2591820A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3633/48A GB648793A (en) 1948-02-07 1948-02-07 Suspension mounting for the focussing device of a cathode ray tube

Publications (1)

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US2591820A true US2591820A (en) 1952-04-08

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US73347A Expired - Lifetime US2591820A (en) 1948-02-07 1949-01-28 Suspension mounting for the focussing device of cathode-ray tubes

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US (1) US2591820A (enrdf_load_stackoverflow)
BE (1) BE487122A (enrdf_load_stackoverflow)
FR (1) FR980905A (enrdf_load_stackoverflow)
GB (1) GB648793A (enrdf_load_stackoverflow)
NL (1) NL144716B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640868A (en) * 1950-11-04 1953-06-02 All Star Products Inc Magnetic focusing device for cathode-ray tubes
US2694782A (en) * 1951-05-19 1954-11-16 All Star Products Inc High efficiency magnetic focusing device for cathode-ray tubes
US2737617A (en) * 1950-12-15 1956-03-06 Int Standard Electric Corp Devices for focussing an electron beam
US2740064A (en) * 1952-08-26 1956-03-27 Hartford Nat Bank & Trust Co Permanent magnet focussing device for cathode ray tubes
US2749486A (en) * 1953-09-21 1956-06-05 Gould John Edward Focussing magnet systems for cathode ray tubes
US2817034A (en) * 1952-10-23 1957-12-17 Cossor Ltd A C Magnetic focussing field arrangements for cathode ray tubes
US2880343A (en) * 1955-12-12 1959-03-31 Glaser Steers Corp Cathode ray tube focusing device
US3629751A (en) * 1969-04-16 1971-12-21 Warwick Electronics Inc Deflection yoke mounting

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200039A (en) * 1937-11-01 1940-05-07 Emi Ltd Permanent magnet device for producing axially symmetrical magnetic fields
US2212206A (en) * 1936-10-30 1940-08-20 Rca Corp Electron device
US2219193A (en) * 1937-05-01 1940-10-22 Gen Electric Cathode ray apparatus
US2224933A (en) * 1934-02-09 1940-12-17 Loewe Radio Inc Magnetic distortion correcting means for cathode ray tubes
US2234720A (en) * 1939-08-10 1941-03-11 Gen Electric Electron discharge apparatus
US2416687A (en) * 1944-03-30 1947-03-04 Bell Telephone Labor Inc Magnetic focussing device
US2418487A (en) * 1944-03-31 1947-04-08 Bell Telephone Labor Inc Cathode ray magnetic focusing device
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2433682A (en) * 1944-10-31 1947-12-30 Philco Corp Electron focusing apparatus
US2440403A (en) * 1945-10-31 1948-04-27 Pye Ltd Focus coil suspension for cathoderay tubes
US2443025A (en) * 1945-07-30 1948-06-08 Gen Electric Cathode-ray apparatus
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2443973A (en) * 1945-01-05 1948-06-22 Avco Mfg Corp Control device for cathode-ray focusing coils
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2501516A (en) * 1947-12-31 1950-03-21 Gen Electric Deflecting and focusing device for cathode-ray apparatus
US2521061A (en) * 1948-03-18 1950-09-05 Motorola Inc Combined focus and centering control for cathode ray tubes
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2224933A (en) * 1934-02-09 1940-12-17 Loewe Radio Inc Magnetic distortion correcting means for cathode ray tubes
US2212206A (en) * 1936-10-30 1940-08-20 Rca Corp Electron device
US2219193A (en) * 1937-05-01 1940-10-22 Gen Electric Cathode ray apparatus
US2200039A (en) * 1937-11-01 1940-05-07 Emi Ltd Permanent magnet device for producing axially symmetrical magnetic fields
US2234720A (en) * 1939-08-10 1941-03-11 Gen Electric Electron discharge apparatus
US2442975A (en) * 1943-08-31 1948-06-08 Rca Corp Focusing system
US2431077A (en) * 1943-08-31 1947-11-18 Rca Corp Cathode-ray tube with revolving magnets and adjustable sleeve
US2416687A (en) * 1944-03-30 1947-03-04 Bell Telephone Labor Inc Magnetic focussing device
US2418487A (en) * 1944-03-31 1947-04-08 Bell Telephone Labor Inc Cathode ray magnetic focusing device
US2433682A (en) * 1944-10-31 1947-12-30 Philco Corp Electron focusing apparatus
US2443973A (en) * 1945-01-05 1948-06-22 Avco Mfg Corp Control device for cathode-ray focusing coils
US2443025A (en) * 1945-07-30 1948-06-08 Gen Electric Cathode-ray apparatus
US2456399A (en) * 1945-10-24 1948-12-14 Gen Electric Cathode-ray apparatus
US2440403A (en) * 1945-10-31 1948-04-27 Pye Ltd Focus coil suspension for cathoderay tubes
US2501516A (en) * 1947-12-31 1950-03-21 Gen Electric Deflecting and focusing device for cathode-ray apparatus
US2521061A (en) * 1948-03-18 1950-09-05 Motorola Inc Combined focus and centering control for cathode ray tubes
US2533687A (en) * 1949-05-27 1950-12-12 Quam Nichols Company Magnetic focusing device
US2533688A (en) * 1950-01-31 1950-12-12 Quam Nichols Company Focusing device
US2533689A (en) * 1950-06-28 1950-12-12 Quam Nichols Company Magnetic focusing device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640868A (en) * 1950-11-04 1953-06-02 All Star Products Inc Magnetic focusing device for cathode-ray tubes
US2737617A (en) * 1950-12-15 1956-03-06 Int Standard Electric Corp Devices for focussing an electron beam
US2694782A (en) * 1951-05-19 1954-11-16 All Star Products Inc High efficiency magnetic focusing device for cathode-ray tubes
US2740064A (en) * 1952-08-26 1956-03-27 Hartford Nat Bank & Trust Co Permanent magnet focussing device for cathode ray tubes
US2817034A (en) * 1952-10-23 1957-12-17 Cossor Ltd A C Magnetic focussing field arrangements for cathode ray tubes
US2749486A (en) * 1953-09-21 1956-06-05 Gould John Edward Focussing magnet systems for cathode ray tubes
US2880343A (en) * 1955-12-12 1959-03-31 Glaser Steers Corp Cathode ray tube focusing device
US3629751A (en) * 1969-04-16 1971-12-21 Warwick Electronics Inc Deflection yoke mounting

Also Published As

Publication number Publication date
NL144716B (nl)
BE487122A (enrdf_load_stackoverflow)
GB648793A (en) 1951-01-10
FR980905A (fr) 1951-05-21

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