JP2006332489A - Flyback transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flyback transformer preventing an occurrence of problems caused by a contact between a focus line/a screen line and the other part at the time of an occurrence of high voltages during a performance check in the production step of a TV set or the like. <P>SOLUTION: There is a space for arranging a metal fitting for fitting and for electrically connecting an outer covering case of a focus volume control. The space is a part needed for an insulation, however, there is a part having no insulation need and the part is divided by the outer covering case without a filling resin. A cylinder or a rectangular tube for temporarily holding the focus line and the screen line is formed in the space. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flyback transformer for high voltage generation of a television set (TV set) and a display monitor set (DM set) using a cathode ray tube (CRT).

  The anode voltage, focus voltage, and screen voltage of a cathode ray tube (CRT) of a television set (TV set) or display monitor (DM set) are supplied from a flyback transformer by a high voltage line.

  The flyback transformer includes a low-voltage primary winding concentrically centered on a core, a high-voltage secondary winding divided into a plurality of layers and each layer connected by a diode, and the winding A primary bobbin and a secondary bobbin for holding and fixing; a plurality of rectifying elements for rectifying a pulse voltage generated in the secondary winding; a component fixing plate made of a plastic molded product for fixing and holding the rectifying element; A resistance substrate in which a DC high voltage obtained by rectifying a pulse voltage generated in a secondary winding by the rectifier element is printed on a ceramic substrate from the middle or maximum pressure portion of the secondary winding, a slider capable of changing a resistance value, and the ceramic substrate The slider is fixed and held by a resin-molded case, and a convex volume with a flat rib and a uniform thickness formed on a part of the case opening side. And ribs that hold the winding bobbin, the rectifying element, the component fixing plate, the focus volume, and the resin and have a uniform thickness with the plane of the focus volume. An outer case having an open port formed by a concave rib into which a metal is press-fitted, a core as a magnetic core, and a high-voltage line for guiding a DC high voltage generated from the secondary winding and rectified by a rectifying element to a CRT A metal clip attached to the tip of the high voltage line for connecting the high voltage line to the CRT anode button, an anode cap for maintaining insulation between the metal clip and the peripheral part, and a focus voltage from the focus volume to the CRT socket part. A focus line for guiding, a screen line for guiding a screen voltage to the CRT socket substrate part, and provided in the outer case; A boss to fix and hold the flyback transformer on the printed circuit board, heat sink or back cover of the TV set or DM set, and temporarily hold the focus line and screen line during TV set or DM set production or flyback transformer production. It is comprised with the cylinder or square tube provided in the said exterior case side for doing.

  Normally, the flyback transformer is fitted on the bottom surface of the flyback transformer main body and the metal wire of the focus volume when the convex rib of the focus volume and the concave rib of the outer case are fitted. A plurality of metal pins are soldered to the printed circuit board.

  The high-voltage line is normally supplied with a DC high voltage of 20 kV to 35 kV, the focus line is normally supplied with a DC high voltage of 4 kV to 12 kV, and the screen line is normally supplied with a DC high voltage of 200 V to 1200 V.

  In the finished TV set or DM set, the high voltage line is connected to the anode button of the CRT, the focus line is connected to the CRT socket, and the screen line is connected to the CRT board, and appropriate insulation is performed.

  However, during the production process of a TV set or DM set or during the production process of a flyback transformer, a high voltage may often be generated without the proper connection for the performance inspection. It is necessary to temporarily fix the focus line and the screen line to prevent problems caused by contact with other parts.

Since the generated voltage is high with respect to the focus line and the screen line, a sufficient insulation measure or insulation distance is necessary. For example, the focus line and the screen line are temporarily inserted into a cylinder or a square tube provided on the side surface of the exterior case and are unnecessary with other parts. There is no contact. In addition, since the length of the focus line and the screen line varies depending on the size of the TV set or DM set, it becomes slack around the flyback transformer just by being fixed to the protrusion formed on the upper surface of the previous case, so that the TV set or DM In the production process of a set or the production process of a flyback transformer, the peripheral inspection device may be contacted. Therefore, the high-voltage line is wound around the flyback transformer main body and processed so as not to generate excessive slack.
JP 2000-195736 A

  In the finished TV set or DM set, the high voltage line is connected to the anode button of the CRT, the focus line is connected to the CRT socket, and the screen line is connected to the CRT board, and appropriate insulation is performed. However, in a TV set or DM set production process or a flyback transformer production process, a high voltage is often generated in the state where the above-mentioned connection is not made for performance inspection.

  Therefore, it is necessary to temporarily fix the focus line and the screen line to prevent problems caused by contact with other parts.

  For this fixing, it is necessary to provide a dedicated cylinder or square tube around the outer case of the flyback transformer, which increases the outer shape of the flyback transformer. However, this cylindrical or square tube TV set or DM set is not necessary and unnecessary. Flyback transformers are required to be smaller and lighter and have a lower price. However, the fixed structure is one of the obstacles for reducing the shape.

  In order to solve the above problems, a space for connecting the flyback transformer main body and the focus volume is used. That is, the flyback transformer main body focus volume is held together by a fitting portion provided in the outer case, filled with resin, and integrated. Further, a high voltage generated in the flyback transformer main body is supplied to the focus volume via a connection line or the like.

  Since the fitting portion for holding the outer case of the focus volume has a structure in which the resin to be filled is not leaked by press-inserting each molded product to each other, a certain size is required. Furthermore, a space is required for arranging a connection fitting for electrically connecting the focus volume and the flyback transformer main body. Because of these dimensions, a space is created between the focus volume and the flyback transformer main body. This space is a necessary part for insulation, but there are parts that do not have any problems in insulation, so a part that does not have any problems in insulation is separated by an exterior case to make a part that is not filled with resin, and the focus line and screen line are temporarily held here. A cylinder or a square tube is formed.

  The flyback transformer main body focus volume is held together by a fitting portion provided in the outer case, filled with resin, and integrated. Further, a high voltage generated in the flyback transformer main body is supplied to the focus volume via a connection line or the like. Since the fitting portion for holding the outer case of the focus volume has a structure in which the resin to be filled is not leaked by press-inserting each molded product to each other, a certain size is required.

  Furthermore, a space is required for arranging a connection fitting for electrically connecting the focus volume and the flyback transformer main body. Because of these dimensions, a space is created between the focus volume and the flyback transformer main body. Although this space is a part necessary for insulation, there is a part that does not have a problem in insulation. Therefore, a part that does not have a problem in insulation can be formed by an exterior case and not filled with partition resin. A cylinder or a square tube for temporarily holding the focus line and the screen line is formed in the portion not filled with the resin thus formed.

  Thus, the shape of the flyback transformer is not increased, and the focus line and the screen line are reliably held so as not to come into contact with other parts in the production process of the focus line and the screen line. Therefore, insulation in the middle of the flyback transformer production process is ensured by this, and one of the obstruction factors for reducing the shape can be eliminated without hindering the production process.

  The flyback transformer of the present invention makes it possible to use conventional components and production equipment as they are. That is, a low-voltage primary winding, a high-voltage secondary winding, a primary bobbin and a secondary bobbin that hold and fix the winding, and a plurality of rectifying elements that rectify a pulse voltage generated in the secondary winding; , A component fixing plate made of a plastic molded product for fixing and holding the rectifying element, and a DC high voltage obtained by rectifying the pulse voltage generated in the secondary winding by the rectifying element in the middle or highest pressure portion of the secondary winding A focus substrate having a slider that can change the resistance value and the resistance substrate printed on the ceramic substrate, a resin that is filled to insulate the generated high voltage, the winding bobbin, the rectifier element, the component fixing plate, An outer case for holding the focus volume and resin, a ferrite core as a magnetic core, and a high voltage for directing a DC high voltage generated from the secondary winding and rectified by the rectifying element to the CRT. A metal clip attached to the tip of the high voltage line connecting the high voltage line to the CRT anode button, an anode cap holding insulation between the metal clip and the peripheral part, and a focus voltage from the focus volume to the CRT socket part To fix the flyback transformer to the focus line for guiding the screen, the screen line for guiding the screen voltage to the CRT socket board part, the printed board of the TV set or DM set, the heat sink or the back cover provided in the outer case. And a cylinder or a square tube provided on the side of the exterior case for temporarily holding the focus line and the screen line when producing a TV set or DM set or when producing a flyback transformer.

  Usually, the flyback transformer is solder-connected to the printed circuit board by a plurality of metal pins provided on the bottom surface thereof.

  The high-voltage line is normally supplied with a DC high voltage of 20 kV to 35 kV, the focus line is normally supplied with a DC high voltage of 5 kV to 12 kV, and the screen line is normally supplied with a DC high voltage of 200 V to 1200 V.

  In the finished TV set or DM set, the high voltage line is connected to the anode button of the CRT, the focus line is connected to the CRT socket, and the screen line is connected to the CRT board, and appropriate insulation is performed.

  However, during the production process of the TV set or DM set or during the production process of the flyback transformer, a high voltage is often generated without proper connection for the performance inspection. Therefore, it is necessary to temporarily fix these focus lines and screen lines in order to prevent problems caused by contact with other parts.

  The focus volume is a resistor printed on a ceramic substrate containing a focus voltage and a screen voltage by inputting a DC high voltage obtained by smoothing a pulse voltage generated by a secondary winding by a rectifying element fixed to a component fixing plate. And adjusted by a slider composed of a conductor and output by a focus line and a screen line.

  Between the focus volume fitted in the exterior case and the component fixing plate, the pulse high voltage generated by the secondary winding and the DC high voltage smoothed by the rectifying element fixed to the component fixing plate are insulated, and the secondary There is a space for connection to guide the DC high voltage extracted from the middle of the winding through the rectifier to the focus volume. This space is filled with resin and becomes a factor of increasing the shape of the flyback transformer. However, since the high voltage applied to this portion is not uniform, a portion having no insulation problem can be partitioned in this space portion by an exterior case, and a portion not filled with resin can be made. A cylinder or a rectangular tube for temporarily holding the focus line and the screen line is formed in the portion not filled with the resin formed thereby.

(Embodiment 1)
An example of an embodiment of the present invention will be described with reference to FIGS. 1 to 5, 1 is a primary winding, 2 is a secondary winding, 3 is a primary bobbin, 4 is a secondary bobbin, 5 is a rectifier, 6 is a component fixing plate, 7 is a focus volume, 8 is Resin, 9 is an exterior case, 9a is a fixing boss provided on the exterior case, 9b is also a focus line fixing cylinder, 9c is also a screen line fixing cylinder, 10 is a ferrite core, 11 is a high voltage line, and 14 is a focus. Line 15 is a screen line.

  In FIG. 1, a focus volume 7 is a ceramic substrate in which a pulse voltage generated by a secondary winding 2 is inputted with a DC high voltage smoothed by a rectifying element 5 fixed to a component fixing plate 6 and a focus voltage and a screen voltage are incorporated. It is adjusted by a slider composed of a resistor and a conductor printed on 7b, and is output by a focus line 14 and a screen line 15.

  The ceramic substrate and the slider are fixedly held by a resin-molded focus volume case 7c, and a focus volume in which convex ribs 7d having a flat surface and a uniform thickness are formed on a part of the case opening side. The focus volume 7 integrated by being press-fitted into an exterior case 9 having an opening formed by a concave rib 9d into which a rib 7d having a uniform thickness with a flat surface of the focus volume is press-fitted Between the component fixing plates 6, a pulse high voltage generated by the secondary winding 2 and a DC high voltage smoothed by the rectifying element 5 fixed to the component fixing plate 6 are fixed to the component fixing plate 6. There is a space 8a for guiding to the focus volume 7 by connecting the connection terminal 6a and the focus connection pin 7a.

  This space 8a is filled with resin and becomes a factor of increasing the shape of the flyback transformer. However, since the high voltage applied to this portion is not uniform, a portion having no insulation problem can be partitioned in the space 8a portion by the outer case 9 to make a portion not filled with resin. Cylinders or rectangular tubes 9b and 9c for temporarily holding the focus lines 14 and the screen lines 15 having openings in the upper surface direction are formed in the portions not filled with the resin.

  FIG. 2 is a front view of the flyback transformer in a state where the focus line 14 and the screen line 15 are temporarily held.

  FIG. 3 is a top view of the flyback transformer in a temporarily held state.

  FIG. 4 is a side view of the flyback transformer in a temporarily held state.

  FIG. 5 is a cross-sectional view of a rectangular tube portion for temporary holding. In the square tube portion 9b into which the focus line 14 formed by the outer case 9 of the flyback transformer is inserted, the dimension B of the bottom surface of the square tube is smaller than the dimension A of the insertion port, and the diameter F of the focus line 14 is increased. On the other hand, the dimension A is large and the dimension B is small. The intermediate dimension between the normal dimension A and the dimension A ′ is made equal to or smaller than the wire diameter F. This is because when the focus line 14 is strongly inserted or when the focus line 14 has a small diameter, the tip 14a of the focus line 14 reaches the bottom surface of the flyback transformer and is printed when a voltage is applied. This is because the substrate is not adversely affected.

(Embodiment 2)
FIG. 6 is a cross-sectional view of the rectangular tubes 9b and 9c formed in the outer case 9 with the focus lines 14 and the screen lines 15 for temporarily holding the first embodiment. A round 9e is added to the entire circumference or a part of the insertion opening in order to improve the insertability.

(Embodiment 3)
FIG. 7 is a cross-sectional view in which the focus line 14 is inserted into the square tube 9b formed in the outer case 9 from the upper surface direction of the flyback transformer for temporary holding in the first embodiment. At this time, in order to prevent the core wire 14a at the tip of the focus line 14 from reaching the printed circuit board 16 to which the flyback transformer is attached, a partition wall 9f is provided in the middle or at the bottom of the square tube 9b and closed. It is. The same applies to the square tube of the screen line.

  The flyback transformer according to the present invention temporarily and securely holds the focus line and the screen line where the DC high voltage is generated without increasing the shape of the TV set, DM set and flyback transformer production process. Since it can be produced without causing accidents that cause unnecessary damage or an electric shock to the operator, it is useful as a flyback transformer for TV sets and display monitors.

Cross-sectional view of flyback transformer according to Embodiment 1 of the present invention Flyback transformer finished product front view according to Embodiment 1 of the present invention Top view of finished flyback transformer according to Embodiment 1 of the present invention Side view of finished flyback transformer according to Embodiment 1 of the present invention Cross-sectional view of a focus line and screen line insertion tube portion according to Embodiment 1 of the present invention Sectional drawing of a focus line and screen line insertion cylinder insertion port part according to Embodiment 2 of the present invention Cross-sectional view of focus line and screen line insertion tube portion according to embodiment 3 of the present invention Complete top view of a conventional flyback transformer

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary winding 2 Secondary winding 3 Primary bobbin 4 Secondary bobbin 5 Rectifier 6 Component fixing plate 6a Focus connection terminal 7 Focus volume 7a Focus connection pin 7b Ceramic substrate 7c Focus volume case 7d Convex rib 8 Resin 8a Space between focus volume and component fixing plate 9 Outer case 9a Fixing boss 9b Focus wire temporary fixing square tube 9c Screen wire temporary fixing square tube 9d Recessed rib 9e Round of insertion port 9f Bulkhead 10 Ferrite core 11 High-voltage wire 12 Metal pin 14 Focus wire 14a Focus wire tip core wire 15 Screen wire 15a Screen wire tip core wire 16 TV set printed circuit board

Claims (4)

A flyback transformer comprising a low-voltage primary winding concentrically centered on a core and a high-voltage secondary winding divided into a plurality of layers and each layer connected by a diode mounted on a component fixing plate The ceramic substrate and the slider are made of resin having a main body, a resistor printed with a DC high voltage taken out from the secondary winding on the ceramic substrate, and a voltage that can be varied by moving the surface of the resistor. A focus volume that is fixedly held by a molded case and has a convex rib with a flat surface and a uniform thickness formed on a part of the case opening side is a rib having a uniform thickness with the flat surface of the focus volume. Is fixed and integrated in parallel with the component fixing plate by being press-fitted into an outer case having an open port formed by a concave rib into which In addition, the fitting is connected to the diode at the same time by this fitting part and the metal wire for connection held on the back of the ceramic substrate of the focus volume is electrically connected to the diode, and these are filled with epoxy resin. Further, in a flyback transformer in which a focus line for supplying a focus voltage to the CRT and a screen line for supplying a screen voltage are connected to the focus volume, the component fixing plate arranged in parallel and the focus volume In the fitting part, the outer casing is arranged to hold the minimum space necessary for insulation and mechanism from the focus volume, the component fixing plate, and the electrical connection part. With an opening on the top surface of the back transformer Forming a plurality of cylindrical or rectangular tube flyback transformer, characterized in that it has a structure capable of inserting the focus line and screen line thereto. 2. The flyback transformer according to claim 1, wherein an inner wall of the cylinder or the rectangular tube is inclined in a vertical direction and a cross-sectional area of a hole is reduced toward a bottom surface. 2. The flyback transformer according to claim 1, wherein an upper surface opening of the cylinder or the rectangular tube is rounded by R. The flyback transformer according to claim 1, wherein a middle part or a lowermost part of a cylinder or a rectangular tube is closed.

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