JPH08241816A - Trigger transformer - Google Patents

Abstract

PURPOSE: To enhance a secondary coil manufacturing process in workability and a trigger transformer in mountability by a method wherein a terminal possessed of a high-voltage end and a low-voltage end which are connected to the high-voltage end and the low-voltage end of a secondary winding respectively is provided to the secondary side of a bobbin. CONSTITUTION: A magnetic core 16 is inserted into the center hole 2 of a bobbin 1 with a secondary winding, a board 9 where a printed coil 10 as a primary winding on a primary side, a core 17, and the bobbin 1 are successively assembled, and lastly a flat core 14 is mounted on the core 17 for the formation of a basic trigger transformer. At this point, a secondary winding 3 is wound on the bobbin 1 where the center hole 2, a cut grooves 4, 7, and 19, and the secondary low-voltage terminal 6 of the secondary winding 3 are previously provided, the low-voltage end 5 of the secondary winding 3 is electrically connected to the secondary low-voltage terminal 6 through the cut groove 4, and the other high-voltage end of the secondary winding 3 is electrically connected to the secondary high-voltage terminal 8 to form the secondary side of a trigger transformer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger circuit trigger transformer used to excite a flash discharge tube used in a photographic strobe device or the like.

[0002]

2. Description of the Related Art Conventionally, in order to excite a flash discharge tube of a photographic strobe device, a capacitor having a size of about 0.01 μF to 0.1 μF is charged with charging energy of 200 V to 300 V through a switch. Discharge to the primary winding of the trigger transformer and 100 kHz to 1 in the secondary winding.
A high voltage of 1 KV to 10 KV is generated at a high frequency of MHz, and this is supplied to the flash discharge tube. The trigger transformer was manufactured by winding an insulated wire as a primary winding on a bobbin for several turns, and then electromagnetically coupling the primary winding with a few hundred turns of a secondary winding having a diameter different from that of the primary winding. Things are commonly used. In addition, sometimes a magnetic material is inserted to improve the magnetic coupling between the primary winding and the secondary winding of the trigger transformer.

Usually, in order to wind up a secondary winding having a wire diameter different from that of the primary winding, it is necessary to carry out winding work using another winding machine different from the primary winding machine, which is a little workability. Therefore, there is a trigger transformer based on a print coil system disclosed in Japanese Patent Laid-Open No. 4-101405 in order to improve such poor work efficiency. This one has a primary coil formed by patterning a winding on a printed circuit board to improve work efficiency by omitting the winding step of the winding.
The trigger transformer itself is made smaller and thinner, and at the same time, the degree of magnetic coupling between the primary side and the secondary side is improved.

[0004]

However, in this conventional device, it is difficult to secure the electrical characteristics when both the primary side winding and the secondary side winding are formed on the printed circuit board, and the secondary side is also difficult to secure. In the case of a normal wire-wound type, there is a problem in winding processing, electrical connection between the terminal and the substrate, and the like, which causes difficulty in mounting and has not been put into practical use.

According to the present invention, in this print type trigger transformer, by improving the winding bobbin of the secondary winding, it is possible to improve the workability and the mountability in the secondary coil manufacturing process and to reduce the cost accordingly. It provides a print type trigger transformer.

[0006]

A primary side including a substrate, a printed coil applied to the substrate to form a primary winding, and a primary low-voltage side terminal provided on the substrate and electrically connected to a low-voltage end of the printed coil; Bobbin of a conductive material, a secondary winding wound on the bobbin a predetermined number of times, a secondary low-voltage side terminal electrically connected to the low-voltage end of the secondary winding and provided on the bobbin through the bobbin, and a bobbin The secondary side, which is provided with a high-voltage side terminal electrically connected to the high-voltage end of the secondary winding, and the low-voltage side of the primary side and the secondary low-voltage side terminal of the secondary side The terminal is inserted into the primary low-voltage side terminal hole of the substrate to connect the primary side and the secondary side.

[0007]

Since the bobbin on the secondary side has the high-voltage and low-voltage terminals to which the high-voltage end and the low-voltage end of the secondary winding are electrically connected, the secondary side can be wound by a single winding machine. Since the secondary side can be handled as a single component, it is possible to mount it on the board by a machine, and the secondary side alone can be an assembly component. Of course, the present invention does not impair the function of the print trigger transformer.

[0008]

EXAMPLES In describing the examples of the present invention,
Those having the same drawing number have the same function, and a duplicate description will be omitted.

FIG. 1 is an exploded structural view showing the basic structure of a trigger transformer of the present invention. A bobbin having a secondary winding, which is the secondary side of the transformer, and a print coil constituting the primary side are provided. In the figure, 1 is a bobbin made of an insulating material that constitutes the secondary side, and 2 is a substrate.
Is a center hole provided in the center of the bobbin 1 and inserted into the rotary shaft of the winding machine for the secondary winding. 3 is a secondary winding wound around the bobbin, the wire diameter and the number of turns of which are mainly determined by the output voltage characteristics. Reference numeral 4 is a cut groove, 5 is a low voltage end of the secondary winding drawn to the upper portion of the bobbin through the cut groove 4, 6 is a secondary low voltage side terminal to which the low voltage end 5 is connected, 7 is a cut groove, and 8 is a secondary groove. It is a secondary high voltage side terminal to which the high voltage end of the secondary winding 3 is connected, and the secondary side of the trigger transformer basically has such a structure.

The primary side combined with the secondary side is shown below, and 9 is a substrate provided with a printed coil 10 in which the primary winding is printed with a desired number of turns in consideration of output voltage characteristics, Reference numeral 11 is a terminal hole in the center of the print coil 10, 12 is another terminal on the low voltage side which is the low voltage end of the print coil 10 when electrically connected to the terminal hole 11 of the print coil 10, and 13 is the primary high voltage of the print coil 10. It is a side terminal, and the primary side has such a basic structure.

FIG. 2 is an exploded configuration diagram in which the primary side and the secondary side, which are the basic configurations of FIG. 1, are combined with a core to form a closed magnetic circuit. Center hole 2 of bobbin 1 and substrate 9
The magnetic core 16 is inserted through the center hole 15 of the printed coil 10 provided in the above, and both end pieces (not shown) of the core 17 are fitted into the notches (not shown) shown in the board 9. The core 17 and the substrate 9 are combined together, and then the magnetic core 16 is inserted through the center hole 2 of the bobbin 1 on which the secondary winding is formed, and the substrate 9 and the core on which the printed coil 10 forming the primary winding on the primary side is formed. A basic trigger transformer is completed by sequentially combining 17 and the bobbin 1 on which the secondary winding 3 is wound, and finally attaching the illustrated flat plate-shaped core 14 to the core 17. The board 9 on which the printed coil 10 is applied may be a hard board, a flexible board, a board having a conductor on one side, or a board having a conductor on both sides. Further, the diameter of the print coil 10 on the primary side and the diameter of the secondary winding on the secondary side do not necessarily have to match.

FIG. 3 shows a first embodiment of the present invention, in which the primary side print coil is formed on a single-sided board of a printed circuit board, and the surface opposite to the pattern surface of the single-sided board is used as a component surface. The upper left surface is a cross-sectional view, the lower surface is a plan view, and the right drawing is a cross-sectional view showing the assembling order.

In this embodiment, the central hole 2, the kerfs 4, 7,
19 and the secondary low-voltage side terminal 6 and secondary high-voltage side terminal 8 of the secondary winding, the secondary winding 3 is wound on the bobbin 1 in which the low-voltage end 5 is passed through the cut groove 4 and the secondary low-voltage side. The secondary side of the trigger transformer is constructed by conductively adhering the terminal 6 and the other high-voltage end to the secondary high-voltage side terminal 8 through the cut groove 7, respectively.

A printed coil 10 forming a primary winding is printed on the printed circuit board 9, and a jumper wire 18 is provided.
Low voltage terminal 22 provided at the low voltage end of the print coil
By electrically conductively adhering to the terminal 20 on the primary low-voltage side provided at the location of the separate terminal 12, it is possible to electrically connect the low-voltage terminal of the print coil and external electric parts (trigger capacitor, switch, etc.).

In the primary coil thus formed,
The secondary winding applied to the bobbin 1 on the secondary side is parallel to
In addition, the secondary low-voltage side terminal 6 is inserted into the hole of the low-voltage terminal 21 provided at the low-voltage end of the print coil 10 so that the jumper wire 18 fits in the cut groove 19. Lastly, the secondary low-voltage side terminal 6 and the printed coil low-voltage terminal 21 are electrically conductively bonded, so that the secondary low-voltage side and the primary low-voltage side can be internally connected in the same manner as a general trigger transformer.

The trigger transformer produced as described above is connected as shown in the drawing to the trigger circuit of the flash discharge tube of FIG. 8 showing a part of the basic light emitting circuit of the electronic flash device, and the light emitting capacitor is connected. When the switch 29 is turned on while 28 is charged to a high voltage of several hundreds of volts, the charging energy of the trigger capacitor 26 is discharged through the primary side print coil 10 of the trigger transformer, and the induced electromotive force due to the magnetic field generated is reduced to two. A high voltage is generated in the secondary winding 3, which excites the flash discharge tube 27 to emit light by the charging energy of the light emitting capacitor 28.

FIG. 4 shows a second embodiment of the trigger transformer of the present invention.
In the embodiment, a printed coil for forming a primary winding is formed on one side of a double-sided board with conductors on both sides. The upper left side is a cross-sectional view, the lower side is a plan view, and the right side is a drawing. FIG. 4 is a sectional view showing an assembling order.

In this embodiment, the secondary winding 3 is wound around the bobbin 1 which is provided with the center hole 2, the cut grooves 4 and 7, the secondary low voltage side terminal 6 and the secondary high voltage side terminal 8 in advance, and the low voltage The end is conductively bonded to the secondary low-voltage side terminal 6 through the cut groove 4, and the high-voltage end is conductively bonded to the secondary high-voltage side terminal 8 through the cut groove 7 to form the secondary side.

The primary side is a print coil provided on one of the two sides of the substrate, that is, on the side opposite to the secondary side or on the opposite side, and in this embodiment, the primary side is used. The winding 10 is formed on the surface facing the secondary side, and the conductor pattern 23 corresponding to the jumper wire 18 of the embodiment of FIG. 3 is formed on the surface opposite to the substrate. This pattern 23
Connects the print coil low-voltage terminal 21 and the primary low-voltage side terminal 24, which are electrically connected, by through-hole processing at substantially the center of the print coil 10. In the primary side print coil 10 thus formed, the secondary winding 3 of the bobbin 1 is inserted in parallel with the coil, and the secondary low voltage side terminal 6 is inserted into the hole of the print coil low voltage terminal 21 to form the bobbin 1. Board 9
Is joined, and finally the secondary low-voltage side terminal 6 and the print coil low-voltage terminal 21 are conductively adhered to complete the trigger transformer. In this embodiment, a trigger transformer having a high degree of magnetic coupling can be obtained because the print coil 10 on the primary side and the secondary winding 3 are closer to each other than in the embodiment shown in FIG.

FIG. 5 shows a third embodiment of the present invention in which a primary side printed coil is formed on both sides of a double-sided board having conductors on both sides. The upper left side is a sectional view and the lower side is a plan view. The drawing on the right shows a sectional view of the assembly.

In this embodiment, first, as described above, the center hole 2, the kerf 7, the secondary low-voltage side terminal 6, and the secondary high-voltage side terminal 8 are provided.
The secondary winding 3 is wound around the bobbin 1 provided in advance, the low-voltage end thereof is directly bonded to the secondary low-voltage side terminal 6, and the high-voltage end is conductively bonded to the secondary high-voltage side terminal 8 through the cut groove 7, respectively. It forms the next side.

On the primary side, printed coils 10 for forming primary windings are printed on both sides of the double-sided board 9 and are electrically connected by a through hole process at the central portion 25 of the printed coils on both sides. At this time, when the current flows from the high-voltage side terminal 13 on the primary side to the primary low-voltage side terminal 24 through the central portion 25, the print coil 10 forming the primary winding on both sides is printed coil on each side. Are formed so as to generate magnetic flux in the same direction. The bobbin 1 is formed so that the secondary winding 3 of the bobbin 1 described above is parallel to the primary coil thus formed, and the secondary low-voltage side terminal 6 is inserted into the hole of the primary low-voltage side terminal 24. And the substrate 9 are joined. Finally, the secondary transformer low-voltage side terminal 6 and the primary low-voltage side terminal 24 are conductively bonded to complete the trigger transformer. In this embodiment, since the number of turns of the primary coil can be increased, a large magnetic field can be generated and a trigger coil having high performance can be produced.

FIG. 6 shows a fourth embodiment of a trigger transformer of the present invention in which print coils are formed on both sides of a double-sided board. The upper left side is a sectional view, the lower side is a plan view, and the right side is its assembly. A sectional view is shown.

As described above, the center hole 2, the kerfs 4, 7
The secondary winding 3 is wound on the bobbin 1 on which the secondary low-voltage side terminal 6 and the secondary high-voltage side terminal 8 are provided in advance, and the low-voltage end thereof is cut into the groove 4.
To the secondary low-voltage side terminal 6, and the high-voltage end is conductively adhered to the secondary high-voltage side terminal 8 through the cut groove 7 to form a secondary coil. Key-shaped secondary low-voltage side terminal 6 shown
Is embedded in the bobbin 1.

On the primary side, printed coils 10 for forming primary windings are printed on both sides of a double-sided board having conductors on both sides, and are electrically connected by through-hole machining at the central portion 25 of the printed coil on each side. ing. At this time, the printed coil 10 on each surface has a current 13
From the center to the print coil low-voltage terminal 22 through the central portion 25, the purine coil 10 on each surface is formed so as to generate magnetic flux in the same direction. In order to make the above-mentioned secondary winding 3 parallel to the primary coil thus formed,
Moreover, the secondary low-voltage side terminal 6 is joined so as to be inserted into the print coil low-voltage terminal 22. Finally, the trigger transformer is completed by conductively bonding the secondary low voltage side terminal 6 and the printed coil low voltage terminal 22.

FIG. 7 shows a fourth embodiment of the present invention in which a printed coil is formed on one side of a double-sided board having conductors on both sides. The upper left side is a sectional view, the lower side is a plan view, and the right side drawing is The assembled sectional view is shown.

As described above, the secondary winding 3 is wound around the bobbin 1 in which the central hole 2, the kerf 7, the secondary low voltage side terminal 6 and the secondary high voltage side terminal 8 are provided in advance, and the low voltage end thereof is The secondary low-voltage side terminal 6 is conductively adhered to the secondary high-voltage side terminal 8 through the cut groove 7 to form a secondary side. The secondary high voltage side terminal 8 is embedded in the bobbin so as to be parallel to the substrate 9 when the bobbin is joined to the substrate, and the L-shaped secondary low voltage side terminal 6 is also embedded in the bobbin as shown in the drawing. ing.

On the primary side, a printed coil 10 of a primary winding is printed, which is printed on either the secondary side opposite to the double-sided substrate 9 or the opposite side, and the opposite side of FIG.
A pattern 23 corresponding to the jumper wire 18 in the above embodiment is formed. This pattern 23 is printed coil 1
The print coil low voltage terminal 21 and the primary low voltage side terminal 24, which are electrically connected by the through hole processing, are connected at the low voltage end portion of the center of 0. The primary low-voltage side terminal 6 is inserted into the terminal hole of the printed coil low-voltage terminal 21 in the primary coil thus formed, and the bobbin 1 and the substrate 9 are joined. Finally, the trigger transformer is completed by conductively bonding the secondary low voltage side terminal 6 and the printed coil low voltage terminal 21. In this embodiment, by making the terminals of the secondary coil horizontal, a thinner trigger transformer can be manufactured.

Of the above-described embodiments, a trigger transformer is actually prepared for the embodiment of FIG. 3 in which the degree of magnetic coupling between the primary coil and the secondary coil is the lowest and is used as the trigger transformer of the trigger circuit shown in FIG. I checked the performance. The created trigger transformer is a print coil having the outermost diameter of 15.0 mmφ, the conductive pattern width of 0.3 mm, and the number of turns of 13 turns printed as a print coil for forming the primary winding of the primary side in FIG. A substrate was used. Next, as a secondary side, a resin-molded bobbin with a diameter of 10.0 mmφ, an inner diameter of 4.0 mmφ, and a winding width of 1.5 mm was provided with 8 mmφ of enamel insulated wire as a secondary winding.
It was made by winding 00 turns. The transformer is an air-core transformer that does not use a magnetic material.

The trigger transformer actually manufactured as described above uses a 0.03 μF trigger capacitor 26 of the trigger circuit shown in FIG. 8 and charges it to 300 V to generate it in the secondary winding 3. As a result of examining the voltage waveform of the trigger output, a voltage waveform as shown in FIG. 9 was obtained, and an output sufficient to excite the flash discharge tube comparable to the output voltage waveform of the conventional trigger transformer was obtained. . Furthermore, the flash discharge tube is actually excited, and the light emitting capacitor 28
When it was made to emit light with the charging energy of, it was also confirmed that it has a trigger ability similar to or higher than the conventional trigger transformer with a magnetic core. This output voltage waveform is the number of winding turns of the print coil on the primary side, the pattern width and the diameter of the print coil, the number of winding turns of the secondary winding on the secondary side, the winding diameter, the winding length, the coil diameter, It goes without saying that it changes depending on various factors such as the presence or absence of a magnetic core.

In this embodiment, the bobbin for winding the secondary winding has wire ends for connecting the low-voltage end and the high-voltage end of the secondary winding to the secondary low-voltage side terminal and the secondary high-voltage terminal, respectively. Although a cut groove for passing through is provided, this cut groove is not always necessary, and the low-voltage and high-voltage terminals of each may be directly connected to the secondary low-voltage terminal and the secondary high-voltage terminal, respectively. However, it is needless to say that the workability is excellent because the wire end can easily guide the wire end to the low-voltage side terminal and the high-voltage side terminal, respectively.

Further, the center hole of the bobbin is provided for inserting the rotary shaft of the winding machine to wind up the secondary winding, and this is also the case where the winding machine is a chuck for bobbin. Of course, it is not necessary to provide a machine for holding the wire, and the point is to make the shape of the bobbin correspond to the machine type of the winding machine.

[0033]

The trigger transformer of the present invention has a structure in which the secondary side can be handled as a single component, so that the manufacturing and mounting work can be automated by a machine, thus improving work efficiency and reducing costs. You can
Also, stable quality can be secured, and the secondary side can be easily replaced as an assembly component. Furthermore, these effects are improved by improving the work efficiency by omitting the winding process of the primary winding of the trigger transformer of the print coil system.
It is possible to realize the characteristics such as downsizing and thinning of the trigger transformer and improvement of the degree of magnetic coupling between the primary winding and the secondary winding without impairing the characteristics.

[Brief description of drawings]

FIG. 1 is an exploded view showing a basic structure of a trigger transformer of the present invention.

FIG. 2 is an exploded view in which a core forming a closed magnetic circuit is attached to a trigger transformer having a basic structure of the present invention.

FIG. 3 is a first embodiment of a trigger transformer of the present invention, in which an upper left surface is a sectional view, a lower left surface is a plan view, and a right drawing is a sectional view showing an assembling order.

FIG. 4 is a second embodiment of the trigger transformer of the present invention, in which an upper left surface is a sectional view, a lower left surface is a plan view, and a right drawing is a sectional view showing an assembling order.

FIG. 5 is a third embodiment of the trigger transformer of the present invention, in which an upper left surface is a sectional view, a lower left surface is a plan view, and a right drawing is a sectional view showing an assembling order.

FIG. 6 is a fourth embodiment of the trigger transformer of the present invention, in which an upper left surface is a sectional view, a lower left surface is a plan view, and a right drawing is a sectional view showing an assembling order.

FIG. 7 is a fifth embodiment of a trigger transformer of the present invention, in which an upper left surface is a sectional view, a lower left surface is a plan view, and a right drawing is a sectional view showing an assembling order.

FIG. 8 is a partial electric circuit diagram of an electronic flash device including a trigger circuit of a flash discharge tube.

FIG. 9 is an output voltage waveform diagram of the second embodiment of the trigger transformer of the present invention.

[Explanation of symbols]

 1 bobbin 2 center hole 3 secondary winding 4 cut groove 5 secondary winding low voltage end 6 secondary low voltage side terminal 7 cut groove 8 secondary high voltage side terminal 9 printed circuit board 10 printed coil 11 terminal hole 12 separate terminal 13 primary high voltage Side terminal 14 Core 15 Center hole 16 Magnetic core 17 Core 18 Jumper wire 19 Cut groove 20 Primary low voltage side terminal 21 Print coil low voltage terminal 22 Print coil low voltage terminal 23 Conductor pattern 24 Primary low voltage side terminal 25 Center part 26 Trigger capacitor 27 Flash discharge tube 28 Light emitting condenser 29 Switch

Claims (13)

[Claims] 1. A trigger transformer for generating a high voltage, which is used in a trigger circuit for exciting a flash discharge tube that emits light by charging energy of a light emitting capacitor, comprising a substrate and a print formed on the substrate to form a primary winding. A coil, a primary side provided with a primary low-voltage side terminal of a print coil provided on a substrate, a bobbin of an insulating material, a secondary winding wound on the bobbin a predetermined number of times, and a secondary winding A secondary low-voltage side terminal electrically connected to the low-voltage end of the bobbin and provided on the bobbin, and a high-voltage side terminal electrically connected to the high-voltage end of the secondary winding on the bobbin. The secondary side low voltage side terminal, which is inserted through the bobbin, is inserted into the primary side terminal hole of the board, the bobbin and the board are joined, and the secondary side low voltage terminal and the primary low voltage side terminal are electrically connected. . 2. A separate terminal provided on the substrate, a jumper wire, and a groove for embedding the jumper wire provided on the bobbin, wherein the low-voltage end of the print coil and the separate terminal are electrically connected by the jumper wire. The trigger transformer described in 1. 3. A first kerf for connecting the low-voltage end of the secondary winding to the secondary low-voltage side terminal of the bobbin, and the high-voltage end of the secondary winding to the secondary high-voltage side terminal of the bobbin. The trigger transformer according to claim 1, wherein the bobbin is provided with a second kerf for connection. 4. The trigger transformer according to claim 1, wherein the bobbin has a central hole into which the rotary shaft of the winding machine is inserted. 5. The trigger transformer according to claim 1, wherein the print coil is provided on a surface opposite to a surface where the bobbin is joined to the substrate. 6. The primary low-voltage side terminal of the print coil and the primary low-voltage side terminal of the bobbin are electrically connected via the secondary low-voltage side terminal of the bobbin, and the surface of the substrate opposite to the surface on which the print coil is provided is provided. The trigger transformer according to claim 1, wherein the substrate is provided with a conductor pattern electrically connected to the secondary low-voltage side terminal inserted through the substrate. 7. The trigger transformer according to claim 1, wherein the print coil is provided on a surface side where the substrate and the bobbin are joined. 8. The trigger transformer according to claim 1, wherein the print coil is provided on a surface opposite to a surface on which the substrate and the bobbin are joined. 9. The trigger transformer according to claim 1, wherein the print coils are provided on both sides of the substrate, and the print coils on both sides are electrically connected by through holes through the substrate. 10. The trigger transformer according to claim 1, wherein the secondary low-voltage side terminal is provided by inserting a surface portion of the bobbin where the bobbin is joined to the substrate. 11. The trigger transformer according to claim 1, wherein the secondary-side low-voltage terminal that is provided by being inserted from above the surface of the bobbin has a linear rod shape. 12. The trigger transformer according to claim 1, wherein the secondary-side low-voltage terminal provided by being inserted from above the surface of the bobbin is key-shaped. 13. The trigger transformer according to claim 1, wherein the secondary-side low-voltage terminal provided by being inserted from above the surface of the bobbin is L-shaped.