JPH0415603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" This invention relates to a trigger transformer for a flash discharge light emitting device used as an illuminator for photography.

``Prior Art'' Most trigger transformers for flash discharge light emitters that have been widely known in the past are wound as shown in FIG.

That is, FIG. 6 shows an example of a trigger transformer, which includes a core iron core 1 having flanges 2, 3 and a winding part 4, and a multilayer structure formed by winding the winding part 4. , and terminal pins 6 and 7 implanted on the outside of the flanges 2 and 3.

The coil 5 is made up of a primary coil and a secondary coil. When forming a secondary coil with a large number of windings, first, the winding pitch is advanced from the flange 2 to the flange 3, and the first layer wound directly on the surface of the winding 4 is applied to the flange. Next, advance the winding pitch in the opposite direction to the above to move the winding pitch from flange 3 to flange 2.
A second layer is formed around the first layer by winding the wire toward the flange 2, and a third layer is formed around the second layer by advancing the winding pitch from the flange 2 to the flange 3.

Thereafter, a fourth layer, a fifth layer, and so on are wound in the same manner to form a secondary coil.

Of the coil ends of the thus wound secondary coil, the high-voltage side is fixed to the terminal pin 6, and the low-voltage side is fixed to the terminal pin 7.

The primary coil is wound as a coil with several turns on the outside of the insulating tape placed around the secondary coil.
The end of the coil is pulled out as an external connection terminal. In addition, there is a structure in which a terminal pin for fixing the coil end of the primary coil is implanted in the flange part 2, and a structure in which the coil 5 is wound around a cylindrical bobbin, and this bobbin is equipped with a columnar core iron core. There are some with a structure that is

"Problems to be Solved by the Invention" In the above-mentioned trigger transformer, the induced electromotive force acts most strongly on the first layer coil closest to the winding section 4, and on the second layer, third layer, and so on. As the distance from the part 4 increases, the effect of this induced electric power gradually decreases. This causes a potential difference and distributed capacitance between the windings, especially between the layers.

As is well known, the distributed capacitance acts not only to lower the Q of the coil but also to increase the potential difference between the lines, so if the output voltage of the trigger transformer is increased, the potential difference increases, causing corona discharge and dielectric breakdown. induce.

The present invention reduces the above-mentioned potential difference and distributed capacitance as much as possible to increase withstand voltage and efficiency, and further,
The purpose is to propose a trigger transformer that is suitable for mass production and convenient for integration.

"Means for Solving the Problems" In order to achieve the above object, the present invention includes a prismatic core core made of ferrite material, a prismatic cylindrical bobbin in which the core core is housed, and a prismatic bobbin that is wound around the bobbin. In the trigger transformer for a flash discharge light emitting device, the bobbin is integrally provided with rectangular flanges on both sides thereof, and is embedded in the outer surface of one of the rectangular flanges so as to protrude in the longitudinal direction of the core iron core. The other square flange has a low-voltage terminal pin embedded in a protrusion formed on its outer surface and protrudes almost perpendicularly to the longitudinal direction of the core core. The coil has a segmented winding formed as a triangular cross-sectional layer inside the rectangular flange by reciprocating the winding pitch, and a segmented winding formed as a triangular cross-sectional layer on the inside of the square flange by reciprocating the winding pitch. A trigger transformer is proposed, which includes a segmented winding coil, the ends of which are fixed to the respective terminal pins described above.

``Function'' The trigger transformer configured as described above not only reduces the line potential difference and distributed capacitance, but also has a coil that is wound at an angle, so there is no flange between each section. Both can be reliably wound, and the trigger transformer configuration does not become large.

Further, since the trigger transformer is wound around a bobbin having a square flange, the bobbin can be held more reliably during the winding process than a bobbin having a circular flange, making the trigger transformer suitable for mass production.

Furthermore, the above-mentioned trigger transformer is installed by inserting the low-voltage terminal pin provided on one square flange into a printed circuit board, etc., but in this case, the high-voltage terminal pin protrudes laterally from the other square flange. This makes it easier to connect the circuit between this terminal pin and other electrical components, and since the high-voltage terminal pin and low-voltage terminal pin are sufficiently spaced apart, there is no risk of electrical leakage between these terminal pins. .

``Example'' Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of the trigger transformer, and FIG. 2 is a bottom view of the trigger transformer.

In these figures, 11 is a prismatic core core made of ferrite material, and 12 is the core core 11.
This bobbin 12 has a square cylindrical part 12a into which the cylindrical part 12a is inserted.
2b and 12c are integrally formed.

13a and 13b are low-voltage terminal pins implanted in one of the rectangular flanges 12b so as to protrude in the longitudinal direction of the core iron core 11, and 13c are terminal pins for low voltage that are perpendicular to the longitudinal direction of the core iron core 11. This pin 13c is a high voltage terminal pin provided on the square flange 12c.
It is planted in d.

16 is a transformer coil consisting of a primary coil 14 and a secondary coil 15. This coil 16 is wound around the rectangular tube portion 12a of the bobbin 12, and the coil ends of the primary coil 14 are connected to the terminal pins 13a, 13b. One end of the secondary coil 15 is fixed to the terminal pin 13a, and the other end is fixed to the terminal pin 13c.

The above-mentioned coil 16 is wound in sections according to the sections a to d shown in the figure. That is, in this embodiment, the rectangular tube portion 12a is divided into four sections a to d, and wires are wound in each section to form a primary coil 14 and a secondary coil 15.

When winding, first, each layer of section a is wound to form the primary coil 14, and then section b is wound in each layer to form the primary coil 14.
Then, the secondary coil 15 is formed by winding the secondary coil 15 in multiple layers in the same manner as in the order of sections c and d.

FIGS. 3 to 5 are explanatory diagrams showing the winding process of the above-mentioned segmental winding.

First, referring to FIG. 3 which shows the winding of section a, the first wire wound on the surface of the square tube part 12a is
The layer advances the winding pitch in a direction away from the square flange 12b until it reaches the boundary of section a, and then transfers the winding to the second layer. At this time, the winding pitch is advanced in the direction of the square flange 2b so that the first winding of the second layer does not protrude from the boundary of section a, and the second layer coil is wound around the first layer. form.

Next, the winding is transferred to the third layer and wound in the range of section a, and the fourth and fifth layer coils are formed in the same manner. In this example, the fifth layer coil of section a is not shown.
Since it is at the al position, pull out the winding from this al position and attach it to the terminal pin.

As shown in Figure 4, the winding of section b is located at the winding position.
Advance the winding pitch to the left from bl ₁ and wind it to the boundary of section b to form the first layer coil, then move the winding to the second layer and advance the winding pitch to the right to form the second layer.
A layer coil is formed in the area of section b. continue,
The winding is transferred to the third layer and the winding pitch is advanced to the left for winding. Thereafter, the fourth and fifth layers are wound in the same manner.

The final winding position of section b is the final winding position of the fifth layer.
Since bl ₂ is obtained, the winding at this position bl ₂ is moved to the first layer first winding position cl ₂ of section c and wound as shown in FIG. Section c is the same as the winding method for section b described above, and the same applies to section d.

Note that the arrows shown in FIGS. 3 to 5 indicate the direction of movement of the winding pitch.

As described above, the primary coil 14 and the secondary coil 15 are formed by winding the wires in sections a to d, but as already mentioned, the winding start end and winding end of these coils are connected to the respective terminal pins 13a, 13b, It attaches to 13c.

Now, when the wires are wound as described above, the potential difference and distributed capacitance not only between the first and fifth layer coils but also between each layer, that is, the potential difference and distributed capacitance appearing between the wires, are compared to conventional products. and becomes extremely small.
In addition, since the boundary between the coils wound in each section and the next coil to be wound is inclined, it is possible to reliably prevent winding collapse by providing the coils to be subsequently wound along this inclination. .

As described above, in the trigger transformer according to the present invention, the potential difference between lines and the distributed capacitance can be reduced without enlarging the form, and the withstand voltage and efficiency of the trigger transformer can be improved.

It should be noted that the present invention can be implemented with either a trigger transformer in which the wire is wound directly on an iron core or a trigger transformer in which the wire is wound on a bobbin, and the number of sections in which the wire is wound can be increased or decreased as necessary. When winding these sections, the winding method is not limited to the method of reciprocating the winding pitch as shown in the above embodiment, but any winding method can be used as long as the coils can be inclined.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a trigger transformer showing an embodiment of the present invention, Fig. 2 is a bottom view of the trigger transformer, and Figs. 3 to 5 show a method of forming the coil of the trigger transformer. The explanatory diagram, FIG. 6, is a simplified sectional view of a trigger transformer shown as a conventional example. 11...core iron core, 12...bobbin, 12b,
12c...square collar part, 12d...convex part, 13a,
13b...Terminal pin for low voltage, 13c...Terminal pin for high voltage, 16...Coil.

Claims (1)

[Claims] 1 A prismatic core core made of ferrite material,
In a trigger transformer for a flash discharge light emitting device, which is composed of a rectangular cylindrical bobbin in which the core iron core is installed and a coil wound around the bobbin, rectangular flanges are integrally provided on both sides of the bobbin, and one side is provided with a rectangular collar part. A low-voltage terminal pin is implanted in the outer surface of the square flange part of the core core so as to protrude in the longitudinal direction of the core core, and a low voltage terminal pin is implanted in the convex part formed on the outer surface of the other square flange part to protrude in the longitudinal direction of the core core core. Each of the coils has a high-voltage terminal pin protruding almost perpendicularly to the longitudinal direction of the coil, and the coil has a segmental winding formed as a triangular cross-section layer inside the rectangular flange by reciprocating the winding pitch, and A trigger transformer comprising a section-wound coil which is wound obliquely along the diagonal sides of the triangular cross-sectional layer by reciprocating the coil, and the ends of the coil are fixed to the respective terminal pins.