JP3182799B2 - High voltage power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage power supply for supplying a high voltage to a corona discharger used in an image recording apparatus such as an electrophotographic copying machine or a printer.

[0002]

2. Description of the Related Art Generally, in an image recording apparatus such as an electrophotographic copying machine or a printer, after a surface of a photosensitive drum is uniformly charged by a primary charger, an image is exposed to the photosensitive drum and the surface of the photosensitive drum is statically charged. An electrostatic latent image is formed, and the electrostatic latent image is developed by a developing device. Then, after the developed image formed on the surface of the photosensitive drum is transferred onto a recording sheet by charging of a transfer charger, the recording sheet on which the developed image has been transferred is charged by a separation charger, and then the surface of the photosensitive drum is charged. Separated from
An image is recorded by fixing a developed image on recording paper by a fixing device.

As described above, in an image recording apparatus such as the electrophotographic copying machine, a plurality of chargers utilizing corona discharge, such as a primary charger, a transfer charger, and a separation charger, are used.

In recent years, in image recording apparatuses such as the above-described electrophotographic copying machines, there has been a strong demand for miniaturization of the apparatuses. In order to miniaturize the apparatuses, various components used therein have to be used. Naturally, there is a strong demand for miniaturization of components. This is strongly demanded not only for the large components constituting the image recording apparatus but also for the small parts constituting the image recording apparatus as well. The components used in the image recording device include:
Although there are a large number of devices of various sizes, high-voltage power supplies for supplying high voltage to primary chargers and separate chargers used in image recording devices are also components that are strongly required to be miniaturized. One.

[0005] This high-voltage power supply device includes a step-up transformer in which a low DC voltage is applied to a primary winding, a control circuit for turning on and off a low DC voltage applied to the primary winding of the boost transformer, Alternatively, when the high-voltage power supply device supplies a high DC voltage, a diode that forms a rectifier circuit or the like connected to the secondary winding of the step-up transformer, a circuit element such as a capacitor or a resistor, or the like is used. Be composed. Among the various components constituting these high-voltage power supply devices, in particular, circuit elements such as a step-up transformer that generates a high voltage and a diode or the like that constitutes a rectifier circuit or the like connected to a secondary winding of the step-up transformer are: Since a high-voltage block constitutes one block-shaped component due to the requirement of high insulation and the like, and is a component that occupies most of the space in terms of the configuration of the high-voltage power supply device, this high-voltage block is In order to make the high-voltage power supply device as small as possible, it is a component that is particularly required to be miniaturized.

The size of the high-voltage block is inevitably large to some extent because of the large number of turns of the winding.
Although it largely depends on the shape of the bobbin of the secondary winding, when the bobbin shape of the secondary winding is fixed, a high-voltage block including a boosting transformer including the bobbin of the secondary winding is used. The miniaturization of the high-voltage block is also possible by reducing the size of the insulating case for housing the constituent parts as small as possible. In this case, by minimizing the gap between the step-up transformer and the insulating case, the size of the insulating case can be reduced.

Conventionally, as described above, the high-voltage power supply unit includes a high-voltage block having a step-up transformer or a rectifier circuit for generating a high voltage, and a low-voltage DC applied to a primary winding of the step-up transformer. It is composed of a printed circuit board having a control circuit for on / off control. Further, the high-voltage block includes a step-up transformer including at least a secondary winding bobbin, a smoothing component for rectifying the output of the step-up transformer, and an insulating filler filled with these components housed therein. An insulating case which is cured and has an opening on at least one surface. The step-up transformer is inserted into a secondary winding bobbin in which a secondary winding is wound around the outer periphery thereof, and is inserted into a hollow portion located at the center of the secondary winding bobbin. And a magnetic core inserted into the central hollow portion of the primary winding bobbin and disposed around the outer periphery of the secondary winding bobbin. are doing.

In the step-up transformer T, as shown in FIG. 14, the terminals 101, 101 of the primary winding wound around the primary winding bobbin 100 are parallel to the insertion direction of the primary winding bobbin 100. So that the primary winding terminals 101, 10
1 is disposed inside the insulating case 102 so as to protrude from the opening surface. As described above, after the step-up transformer T is housed in the insulating case 102, the inside of the insulating case 102 is filled with the insulating filler material from the opening side thereof and hardened, so that the high-voltage side and the low-pressure side It was configured to maintain insulation.

The winding of the primary and secondary windings on the primary winding bobbin and the secondary winding bobbin of the step-up transformer is performed by an automatic winding machine. In view of the holding state of the winding of the wire machine and the performance of the winding operation, the secondary winding on which a thin winding is wound many times is limited to a relatively large diameter winding. As a result, it is difficult to reduce the size of the secondary winding bobbin around which the secondary winding of the step-up transformer is wound to a certain extent or more. There were certain limits.

Further, components such as the primary winding bobbin and the secondary winding bobbin of the step-up transformer are manufactured by injection molding of a synthetic resin. There is also a limit to downsizing parts such as wire bobbins by reducing the thickness and the like.

[0011]

However, the above-mentioned prior art has the following problems. That is, in the case of the conventional high-voltage power supply device, as shown in FIG. 14, the terminals 101, 101 of the primary winding in which the step-up transformer T is wound around the primary winding bobbin 100 are connected to the primary side. The primary winding terminals 101, 101 are inserted into the insulating case 102 from the bottom side so as to be parallel to the insertion direction of the winding bobbin 100 so that the primary winding terminals 101, 101 protrude from the opening surface. After being disposed inside, the inside of the insulating case 102 is filled with an insulating filler from the opening side to insulate the high voltage side and the low voltage side of the high voltage block.

Therefore, the step-up transformer T is connected to the insulating case 1
02 in the insulating case 10
Secondary winding bobbin 10 which occupies the most space inside 2
3 are side walls 104, 1 located at both ends in the axial direction.
04 and 2 wound along the axial direction of the secondary winding bobbin
The partition walls 105 that separate the secondary windings from each other are shown in FIG.
As shown in FIG. 4, it is located in a direction parallel to the opening surface of the insulating case 102. Moreover, if the gap between the boost transformer and the insulating case is set as small as possible for the purpose of reducing the size of the high-voltage block, the gap left between the secondary winding bobbin of the boost transformer and the insulating case is extremely small. Narrows. As a result, the insulating case is filled with an insulative filler from the opening side thereof and hardened to insulate the high voltage side and the low voltage side of the high voltage block from the side wall of the secondary winding bobbin 103. Parts 104, 104 and partition 10
5, 105... Hinder the flow of the insulating filler filling the inside of the insulating case 102, and very much remain between the secondary winding bobbin 103 of the step-up transformer T and the insulating case 102. The narrow gap also hinders the flow of the filler, and the flow of the filler deteriorates. Therefore, the filling of the insulating filler becomes insufficient, and the filler fills around the secondary winding of the step-up transformer T and around the high-voltage components. However, there is a problem that voids are formed which are not filled, and insulation failure of the high voltage block occurs.

The winding of the primary and secondary windings on the primary winding bobbin and the secondary winding bobbin of the step-up transformer is performed by an automatic winding machine. As the performance of the automatic winding machine has improved, it has become possible to use a secondary winding having a relatively small diameter as a secondary winding, and the secondary winding on which the secondary winding of the step-up transformer is wound. It is becoming possible to reduce the size of the winding bobbin. Therefore,
There has been a demand for reviewing the use of a conventional step-up transformer that uses a secondary winding bobbin as it is in a high-voltage block of a high-voltage power supply device.

Further, the components such as the primary winding bobbin and the secondary winding bobbin of the step-up transformer are manufactured by injection molding of a synthetic resin. It has also become possible to reduce the size of components such as wire bobbins. For this reason, there has been a demand for reviewing the use of the conventional step-up transformer using the secondary winding bobbin as it is in the high-voltage block of the high-voltage power supply device.

[0015]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art.
The purpose is to ensure that the insulating filler is filled with the components such as the step-up transformer inside the insulating case, and the insulation on the high voltage side and the low voltage side can be obtained more reliably. Another object of the present invention is to provide a high-voltage power supply device capable of further reducing the size of the device.

That is, the present invention provides an insulating case having an opening surface on at least one surface, a step-up transformer housed inside the insulating case, and an insulating case in which the step-up transformer is housed inside the insulating case. In the high-voltage power supply having an insulating member filled in a case, the step-up transformer includes a partition for winding the secondary winding around the bobbin main body in a plurality of sections along the axial direction thereof, A secondary winding bobbin provided on the outer periphery along the axial direction, and a secondary winding wound around a bobbin main body between the partition walls;
A primary winding bobbin accommodated in a state where a primary winding is wound inside a bobbin main body of a secondary winding bobbin, and an inner portion of the primary winding bobbin and an outer periphery of a secondary winding bobbin And a core forming a magnetic circuit in a state surrounding the step-up transformer. The step-up transformer is housed and arranged in the insulating case such that the partition wall of the secondary winding bobbin is orthogonal to the opening surface of the insulating case. It is configured to be.

[0017]

In the present invention, the step-up transformer is provided with a partition wall along the axial direction on the outer periphery of the bobbin main body for partitioning and winding the secondary winding on the bobbin main body along the axial direction. A secondary winding bobbin in which a secondary winding is wound around a bobbin main body between the partition walls; and a primary winding wound inside the bobbin main body of the secondary winding bobbin. A secondary winding bobbin; and a core forming a magnetic circuit in a state surrounding the inside of the primary winding bobbin and the outer periphery of the secondary winding bobbin. The partition of the bobbin is configured to be housed and arranged in the insulating case so as to be orthogonal to the opening surface of the insulating case. Therefore, the boosting transformer is housed and arranged in the insulating case so that the partition wall of the secondary winding bobbin is orthogonal to the opening surface of the insulating case. When filling the inside with the insulating filler, the partition of the secondary winding bobbin prevents the filling of the filler because the partition of the secondary winding bobbin is located in the same direction as the filling direction of the filler. Therefore, the insulating filler can be reliably filled. Further, the step-up transformer is accommodated in the insulating case so that the partition wall of the secondary winding bobbin is orthogonal to the opening surface of the insulating case. The depth of the insulating case to be made can be reduced to about the same as the axial length of the step-up transformer, and the depth of the insulating case can be reduced. As a result, the installation area and the overall volume of the insulating case can be reduced. And the size of the device can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

FIG. 2 is a circuit diagram showing a DC high-voltage power supply as one embodiment of the high-voltage power supply according to the present invention.

In the figure, T is a step-up transformer. A predetermined DC voltage (for example, +24 V) is applied to one end of the primary winding N1 of the step-up transformer T, and the other end is The switching element Q is connected. The secondary winding N2 of the step-up transformer T has diodes DA1, DA2 and capacitors C1, C2.
And a Cockcroft-Walton-type multiple voltage rectification circuit 1 comprising: The diode DA1
From the connection point 2 between the capacitor C1 and the limiting resistor R02
A predetermined high DC voltage is output to a primary charger and the like of an image recording apparatus such as an electrophotographic copying machine (not shown) via the power supply.

The DC high-voltage power supply has an output voltage detection circuit 3 and an output current detection circuit 4 on the secondary side of the step-up transformer T in order to output a constant voltage and a constant current. By detecting the output voltage and the output current by the output voltage detection circuit 3 and the output current detection circuit 4, the output control circuit 5 controls the on / off of the switching element Q to maintain the output voltage and the output current at constant values. It has become.

As described above, the DC high-voltage power supply device includes the step-up transformer T in which the low DC voltage is applied to the primary winding N1 and the low DC voltage applied to the primary winding N1 of the step-up transformer T. A control circuit such as an output control circuit 5 for turning on and off the voltage, and a secondary winding N2 of the step-up transformer T
Diodes DA1, which constitute a rectifier circuit or the like connected to
DA2, circuit elements such as capacitors C1 and C2 and resistors R01 and R02. Among various components constituting these DC high-voltage power supply devices, in particular, a step-up transformer T for generating a high voltage and a diode D forming a rectifier circuit connected to the secondary winding N2 of the step-up transformer T and the like.
The circuit elements such as A1 and DA2 constitute one high-voltage block 6 in terms of insulation and the like.

In this embodiment, an insulating case having an opening surface on at least one surface, a step-up transformer housed inside the insulating case, and a state where the step-up transformer is housed inside the insulating case, A high-voltage power supply having an insulating member filled in an insulating case;
The step-up transformer includes a partition wall for partitioning and winding the secondary winding around the bobbin main body along the axial direction on the outer periphery of the bobbin main body along the axial direction. A secondary winding bobbin wound with a secondary winding, a primary winding bobbin housed in a state where the primary winding is wound inside a bobbin main body of the secondary winding bobbin, A core forming a magnetic circuit in a state surrounding the inside of the primary winding bobbin and the outer periphery of the secondary winding bobbin; It is configured to be housed and arranged in the insulating case so as to be orthogonal to the opening surface of the case.

That is, as shown in FIG. 3, the insulating case 10 is formed of a synthetic resin or the like into a rectangular parallelepiped shape in which a part of a side surface facing the entire bottom surface is partially opened.
More specifically, the insulating case 10 has a bottom 11
Are open on the whole surface, the first and second side walls 12 and 13 having a relatively wide width, the third and fourth side walls 14 and 15 having a relatively narrow width, and 1
And second and second side walls 12, 13 and third and fourth side walls 14,
The first and second side walls 12, 13 are formed in a rectangular parallelepiped shape from a ceiling wall 16 surrounded on all sides by the first side wall 15 and the fourth side wall 15, as shown in FIG. The part is opened in a substantially square shape, leaving a slight border 16 ′, 16 ′ and 15 ′ between the ceiling wall 16 and the fourth side wall 15.

As shown in FIGS. 3 and 4, the insulating case 10 has a primary charger (not shown) on an end portion on the third side wall 14 side and on the ceiling wall 16 side. For example, a connection terminal 17 for outputting a predetermined DC high voltage is provided. This connection terminal portion 17 is connected to the first
By connecting the side wall 12 and the second side wall 13 to each other, a partition wall 18 having an L-shaped cross section that constitutes the connection terminal portion 17 is provided.
A base end having a small hole for connection of a connection terminal 19 called a faston terminal for outputting a predetermined high DC voltage to a primary charger or the like of an image recording apparatus (not shown) is formed on a wall portion 18a parallel to 6. 19a is fixed in a buried state.
Further, as shown in FIG. 6, the connection terminal portion 17 has an opening at a portion corresponding to the ceiling wall 16, and a primary charger or the like of the image recording apparatus is directly connected to the connection terminal 19 from outside the insulating case 11. Connectable.

On the other hand, the step-up transformer T housed inside the insulating case 10 has a primary winding bobbin 20 and a secondary winding bobbin 21 as shown in FIG. As shown in FIG. 5, the secondary winding bobbin 21 has a cylindrical bobbin main body 22, and a planar approximately square formed integrally at both ends in the axial direction of the bobbin main body 22 with a relatively large thickness. Side walls 23, 23 and the outer periphery of the bobbin main body 22 are integrally formed in a disk shape along the axial direction at predetermined intervals, and the secondary winding N2 is attached to the bobbin main body 22 in the axial direction. , And partition walls 24, 24,...

As shown in FIGS. 6 and 7, the side walls 23 of the secondary winding bobbin 21 are connected to the first and second side walls 12 and 13 and the ceiling wall 16 of the insulating case 10. The first and second side walls 12, 13
In addition, a part of the side wall of the insulating case 10 is also used. That is, the first and second side walls 12,
As shown in FIG. 3, the openings 12a and 13a of
A V-shaped groove 2 for fitting and fixing both side walls 23, 23 of the secondary winding bobbin 21 and the ceiling wall 16 to the end surface thereof.
5, 25, 25 are formed on both side walls 23, 23 of the secondary winding bobbin 21, and as shown in FIG.
V-shaped protrusions 26, 26 for fitting with 5, 25,
26 are formed.

Further, the secondary winding bobbin 21 has:
As shown in FIGS. 3 and 5, the secondary winding N wound around the secondary winding bobbin 21 on one end surface of the both side walls 23.
Connection terminals 27, 27 for connecting both ends of the second side wall 2 are respectively protruded to the side, and the one side end face of the both side walls 23 is provided with a secondary winding bobbin 21 on a printed circuit board to be described later. The legs 28, 28 for attaching to the side are protruded sideways. In FIG. 5, reference numeral 29 denotes a cutout provided in the partition walls 24 of the secondary winding bobbin 21. The notch serves as a groove for transferring the secondary winding between the partition walls 24, 24.

On the secondary winding bobbin 21 configured as described above, a secondary winding N2 composed of a considerably thinner wire than the conventional one is provided on the outer periphery of the bobbin main body 22 with partition walls 24, 2
.. Are wound into plural sections. As described above, by using a considerably thinner wire than the conventional one as the secondary winding N2, the entire secondary winding bobbin 21 can be reduced in size. Parts such as the side winding bobbin 21 can be reduced in size.

Further, the primary winding bobbin 20 is configured as shown in FIG.
As shown in FIG. 3, a cylindrical bobbin main body 30, small flanges 31 and 32 protruding toward the outer periphery at both axial ends of the bobbin main body 30, and these flanges 3
Core receiving portions 33 and 34, which protrude integrally with the end surfaces of the bobbin main body 30 along the axial direction and have the same inner diameter as the inner diameter of the bobbin main body 30 and receive cores described later, The side wall 23 of the secondary winding bobbin 21 is
And a connection terminal mounting part 36 for fixing the connection terminals 35 for connecting the primary winding N1 to the both sides in the diametrical direction with substantially the same width as that of the primary winding N1.

Then, on the primary winding bobbin 20 configured as described above, a primary winding N1 composed of a wire that is considerably thicker than the secondary winding on the outer periphery of the bobbin main body 30 is provided in a single layer. Both ends of the primary winding N <b> 1 are connected to connection terminals 35, 35. Also, the primary winding bobbin 2 on which the primary winding N1 is wound as described above.
Numeral 0 is inserted into a cylindrical hollow portion formed inside the bobbin main body 22 of the secondary winding bobbin 21 as shown in FIG. As a result, the core receiving portions 3 formed at both axial ends of the primary winding bobbin 20 are formed.
3, 34 project from the surface of the side walls 23, 23 of the secondary winding bobbin 21. When the primary winding bobbin 20 is inserted into the hollow portion of the bobbin main body 22 of the secondary winding bobbin 21, the connection terminal attachment portion 36 of the primary winding bobbin 20 is placed in the secondary winding bobbin. Side wall 2 of wire bobbin 21
3 is configured to perform a function of positioning the primary winding bobbin 20 by relatively engaging with a projection (not shown) provided on the base 3.

The step-up transformer T has the primary winding bobbin 20 wound with the primary winding N1 inserted and arranged in the hollow portion of the bobbin main body 22 of the secondary winding bobbin 21 as described above. By fitting the side walls 23, 23 of the secondary winding bobbin 21 into the openings 12a, 13a of the first and second side walls 12, 13 of the insulating case 10, the insulating case 1
0 is attached. And the step-up transformer T is
As shown in FIG. 6, cores 40 and 40 constituting a magnetic circuit are attached to the outer periphery thereof.

As shown in FIG. 3, the cores 40, 40 are composed of two members 40, 4 formed symmetrically with each other.
These cores 40, 40 are formed integrally with the cylindrical portions 41, 41 inserted into the hollow interior of the bobbin main body 30 of the primary winding bobbin 20, and are integrated with the ends of the cylindrical portions 41, 41. And L-shaped portions 42, 42 formed in a uniform manner. 6 and FIG.
Are fixed to each other by an adhesive or the like in a state where they are arranged as shown in FIG.

As shown in FIGS. 3 and 9, this step-up transformer T is connected to a printed wiring board 42 made of a rectangular epoxy board or the like having an area slightly smaller than the side shape of the step-up transformer T. That is, as shown in FIG. 9, two cutouts 43 and 44 are formed in opposing edges of the printed wiring board 42 formed in a rectangular shape. As shown in FIG. 9, high-voltage side connection terminals 27 connected to both ends of the secondary winding N2 of the step-up transformer T are fixed to the cutout portions 43, 43, respectively. Printed circuit board 42
The circuit elements connected as shown in FIG. 2 are electrically connected to the secondary winding N2 of the step-up transformer T. Also, the notch 4 below the printed wiring board 42
As shown in FIG.
Legs 28 projecting from the side walls 23 of the secondary winding bobbin 21 are fitted and fixed.

As shown in FIGS. 9 and 10, connection terminals 45 and 46 for detecting an output voltage and an output current are provided at the lower end of the printed circuit board 42, respectively. It protrudes downward along a direction parallel to the surface. These connection terminals 45 and 46 are
As shown in (2), the output voltage detection circuit 3 and the output current detection circuit 4 are connected 2 respectively.

The printed wiring board 42 is the same as that shown in FIG.
As shown in FIG. 3, the side edges are formed in the concave grooves 47 formed on the inner surfaces of the first and second side walls 12 and 13 of the insulating case 10.
By being fitted to 47, it is attached inside the insulating case 10.

With the above configuration, the DC high-voltage power supply according to this embodiment is assembled as follows. That is, as shown in FIG. 3, in a state where the step-up transformer T is connected and fixed to the printed wiring board 42, the step-up transformer T
The side walls 23, 23 of the secondary winding bobbin 21 are
The first and second side walls 12 and 13 of the insulating case 10 are fitted with the concave grooves 47 and 4 formed on the inner surfaces of the first and second side walls 12 and 13 of the insulating case 10.
7, the circuit elements constituting the rectifier circuit and the like mounted on the step-up transformer T and the printed wiring board 42 are housed in the insulating case 10. In this state, the step-up transformer T is mounted on the partition wall 2 of the secondary winding bobbin 21.
Are housed and arranged in the insulating case 10 so as to be orthogonal to the opening surface of the bottom of the insulating case 10 as shown in FIGS.

Then, in this state, the inside of the insulating case 10 is filled with an insulating filler material 50, so that the step-up transformer T housed and disposed in the insulating case 10 and the rectifying circuit attached to the printed wiring board 42. Insulation between the high voltage side and the low voltage side is performed.

In this way, as shown in FIG. 3, the step-up transformer T separates the secondary winding N2 around the bobbin main body 22 along the axial direction and divides the secondary winding N2 into a plurality of sections.
Is provided on the outer periphery of the bobbin main body 22 along the axial direction, and the bobbin main body 22 between the partition walls 24, 24,.
, A primary winding bobbin 20 that is housed inside the bobbin body 22 of the secondary winding bobbin 21 with the primary winding N1 wound thereon, A core 40 constituting a magnetic circuit in a state surrounding the inside of the primary winding bobbin 20 and the outer periphery of the secondary winding bobbin 21,
, And the step-up transformer T is housed and arranged in the insulating case 10 such that the partition walls 24 of the secondary winding bobbin 21 are orthogonal to the opening surface of the insulating case 10. It is configured. Therefore, the step-up transformer T is connected to the partition walls 24 of the secondary winding bobbin 21,
To be orthogonal to the opening surface of the insulating case 10,
When the insulating case 10 containing the step-up transformer T and the like is filled with the insulating filler 50, the partition walls 24 of the secondary winding bobbin 21 are arranged and housed in the insulating case 10. Are located in the direction parallel to the filling direction of the filler 50, that is, in the same direction, the partition walls 24 of the secondary winding bobbin 21 do not hinder the filling of the filler.
The filling of the insulating filler material 50 can be performed reliably.

The step-up transformer T is connected to the insulating case 10 by the partition walls 24 of the secondary winding bobbin 21.
The insulating case 10 is perpendicular to the opening 11 of the
The depth of the insulating case 10 that houses the step-up transformer T can be reduced to approximately the same as the axial length of the step-up transformer T, and the depth of the insulating case 10 can be reduced. That is, the width of the third and fourth side walls 14 and 15 can be reduced, so that the installation area and the entire volume of the insulating case 10 can be reduced, and the device can be downsized.

Second Embodiment FIGS. 11 to 13 show a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals and explained. In the embodiment, all of the step-up transformer, that is, the core including the core is housed in the insulating case.

That is, as shown in FIG. 11, the insulating case 10 has a substantially rectangular parallelepiped shape in which only the bottom portion is opened.
As shown in the figure, all of the step-up transformer T is housed. Also, due to the mounting space, the ceiling wall portion 16a of the insulating case 10 on the side of the step-up transformer T
Are formed in a curved shape, and are formed so as to be smoothly continuous with the fourth side wall 15.

In such a case, since the cores 40, 40 of the step-up transformer T do not protrude outside the insulating case 11, it is necessary to prevent the cores 40, 40 of the step-up transformer T from interfering with other members. Can be.

The other constructions and operations are the same as those of the first embodiment, and a description thereof will be omitted.

In the above embodiment, the case where the high-voltage power supply according to the present invention is applied to a DC high-voltage power supply is described. However, the present invention is not limited to this. Of course.

Further, in the above embodiment, the case where the high-voltage power supply according to the present invention is used as a device for supplying a high voltage for charging an image recording apparatus has been described. However, the present invention is not limited to this. Of course, it can also be used as a device for supplying a high voltage to the above devices.

[0047]

The present invention has the above-described structure and operation, and can reliably perform filling of an insulating filler in a state where components such as a step-up transformer are housed in an insulating case. It is possible to provide a high-voltage power supply device in which insulation on the high-voltage side and the low-voltage side can be obtained more reliably and the device can be further reduced in size.

[Brief description of the drawings]

FIG. 1 is a bottom view showing one embodiment of a high-voltage power supply device according to the present invention.

FIG. 2 is a circuit diagram showing one embodiment of a high-voltage power supply device according to the present invention.

FIG. 3 is an exploded perspective view showing one embodiment of the high-voltage power supply device according to the present invention.

FIGS. 4A and 4B are a side view and a front view, respectively, showing a main part of the insulating case.

5 (a) to 5 (e) are a front view, a side view, a plan view, a rear view, and an AA, respectively, showing a secondary winding bobbin.
It is a line sectional view.

FIG. 6 is an external perspective view showing one embodiment of the high-voltage power supply device according to the present invention.

FIG. 7 is an external perspective view showing one embodiment of the high-voltage power supply device according to the present invention.

FIGS. 8A to 8C are a plan view, a front view, and a bottom view, respectively, showing a primary winding bobbin.

FIGS. 9A to 9C are a front view, a side view, and a bottom view showing a secondary winding bobbin portion, respectively.

FIG. 10 is a front view of a use state showing one embodiment of the high-voltage power supply device according to the present invention.

FIG. 11 is an exploded perspective view showing a high-voltage power supply according to another embodiment of the present invention.

FIG. 12 is an external perspective view showing a high-voltage power supply device according to another embodiment of the present invention.

FIG. 13 is an external perspective view showing a high-voltage power supply device according to another embodiment of the present invention.

FIG. 14 is an external perspective view showing a conventional high-voltage power supply device.

[Explanation of symbols]

T step-up transformer, RECT multiplying voltage rectifier circuit, Q switching element, 10 insulating case, 20 primary winding bobbin, 21 secondary winding bobbin, 24 partition, 40 core, 50 insulating material

Claims (1)

(57) [Claims] 1. An insulating case having an opening surface on at least one surface, a step-up transformer housed inside the insulating case, and filling the inside of the insulating case with the step-up transformer housed inside the insulating case. A high-voltage power supply device having an insulating member, wherein the step-up transformer forms a plurality of partition walls around the bobbin main body along the axial direction by dividing the secondary winding into a plurality of parts, and the partition wall is formed on the outer periphery of the bobbin main body in the axial direction. And a secondary winding bobbin in which a secondary winding is wound around a bobbin main body between the partition walls, and a state in which a primary winding is wound inside the bobbin main body of the secondary winding bobbin. 1 housed in
A secondary winding bobbin; and a core forming a magnetic circuit in a state surrounding the inside of the primary winding bobbin and the outer periphery of the secondary winding bobbin. A high-voltage power supply device, wherein a partition wall of a bobbin is housed and disposed in an insulating case so as to be orthogonal to an opening surface of the insulating case.