JP2003332157A - Trigger coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trigger coil contriving miniaturization of the trigger coil and improvement in the properties of assembling work. <P>SOLUTION: This trigger coil is provided with a rod-like core 11, a pair of bobbins 12 that are fixed to both end parts of this core 11, terminals 16a to 16d that are inserted into these bobbins 12 and have a substrate mounting terminal part 19 at the bottom part and a winding treatment terminal part 18 at the side part, and a coil 21 comprising a primary winding and a secondary winding that are wound on the core 11 and have the winding start terminal and the winding end terminal connected with the winding treatment terminal part 18. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger coil used in optical devices such as cameras, portable information devices such as digital cameras and mobile phones.

[0002]

2. Description of the Related Art A trigger coil used in an optical device such as a camera is constructed, for example, as shown in FIGS. That is, the bobbin 1 made of an insulating material such as a synthetic resin material is a vertical type and is composed of an upper flange portion 2, a lower flange portion 3, and a central cylindrical portion 4 that connects both flange portions 2 and 3. A copper wire is wound around the central cylindrical portion 4 of the bobbin 1 to provide a winding 5.

The lower flange portion 3 is provided with a pair of low-voltage terminals 6 and 7, and these terminals 6 and 7 are attached to the lower flange portion 3 and mounting portions 6a and 7a having a U-shaped cross section. Winding connection portion 6 formed integrally with the portions 6a and 7a
b, 7b are provided. Also, the upper flange portion 2
The mounting step portion 8 is provided integrally with the mounting step portion 8, and the high voltage terminal 9 is fixed to the mounting step portion 8. The primary winding is connected to the winding connecting portions 6b and 7b, and the high voltage terminal 9
A secondary winding is connected to the. 1
0 is a rod-shaped core.

[0004]

However, the conventional trigger coil constructed as described above has a large height and is large in size, and the low-voltage terminals 6 and 7 are provided on the lower flange portion 3 of the bobbin 1. The high-voltage terminal 9 is attached and fixed to the upper flange portion 2 of the bobbin 1 from the viewpoint of eliminating the risk of discharge between the high-voltage terminal 9 and the common terminal 7.

Therefore, when the trigger coil is mounted on the wiring board, the soldering cannot be performed all at once by reflow, and the high voltage terminal 9 needs to be separately soldered to the wiring board. Also, conventional trigger coils are generally
Since it has an open structure, the level of noise with respect to external circuits and parts arranged in close proximity is high, which adversely affects the operation. Furthermore, it is necessary to increase the number of winding turns in order to obtain the required high voltage. To form many windings in a limited area, thin wires must be used as the winding copper wire. There has been a problem that as the copper wire used for carrying out the winding wire becomes finer, the difficulty of winding increases and the manufacturing cost increases.

The present invention has been made in view of the above circumstances. The purpose of the invention is to reduce the size, improve the assembling workability, and perform soldering all at once by reflow when mounting on a wiring board. It is to provide a trigger coil that can be implemented.

[0007]

In order to solve the above-mentioned problems, the present invention provides a rod-shaped core, a pair of bobbins fixed to both ends of the core, and inserts into these bobbins. A terminal having a board mounting terminal portion on a bottom portion, a winding processing terminal portion on a side portion, a primary winding wound around the core and having a winding start terminal and a winding end terminal connected to the winding processing terminal portion; A trigger coil comprising a coil composed of a secondary winding.

According to a second aspect of the present invention, the bobbin according to the first aspect has a fitting recess into which both ends of the core are fitted, and both ends of the core are adhesively fixed to the fitting recess. And

A third aspect of the present invention is characterized in that the bobbin of the first aspect is provided with a lead wire passage for guiding a winding start end and a winding end end of the coil to the winding processing terminal portion.

A fourth aspect of the present invention is characterized in that the coil according to the first aspect is covered with an exterior insulating tape and a flat surface is formed on the upper surface.

According to the above construction, the bobbin is fixed to both ends of the rod-shaped core to form the winding frame, and in this state, the coil including the primary winding and the secondary winding is attached to the core. By winding, the trigger coil can be constructed.

Further, since the board mounting terminal portion is provided on the bottom portion of the bobbin and the winding processing terminal portion is provided on the side portion, soldering can be performed all at once by reflow when mounting on the wiring board. You can

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of a trigger coil, FIG. 1 (a) is a plan view, and FIG. 1 (b) is a side view.
(C) is a left side view and FIG. 2 is a perspective view of the trigger coil.

As shown in FIGS. 1 and 2, a rod-shaped core 1
1 is made of, for example, a magnetic material having a high electric insulation property, and has a rectangular cross section and a chamfered corner portion.

The pair of bobbins 12 of the same shape provided on both ends of the core 11 are formed in a rectangular parallelepiped shape by an insulating material such as a synthetic resin material. The bobbin 12 is provided with a fitting recess 13 into which both ends of the core 11 are fitted. The fitting recess 13 is open at the side surface and the upper surface where the bobbins 12 face each other. Then, both ends of the core 11 are adhesively fixed by being inserted into the fitting recess 13 from above the bobbin 12, and the core 11 and the pair of bobbins 12 form a winding frame 14.

The lower portion of the bobbin 12 is formed to be slightly wider and has a bottom portion 15a and side portions 15b.
2 for low voltage and 2 for high voltage, total 4 terminals 16
a to 16d are provided in an inserted state.

The terminals 16a to 16d have the same shape and are formed by punching out a copper plate, phosphor bronze or the like into a substantially U-shape, and the terminal main body portion 17 and the corner portions protruding from the terminal main body portion 17 to the side portions 15b. Is a chamfered winding processing terminal portion 18, and
The substrate mounting terminal portion 19 is formed by projecting rearward from the base portion at a right angle to the winding processing terminal portion 18 and projecting along the bottom portion 15a, the chamfered corner portion being R chamfered.

Therefore, the winding processing terminal portion 18 provided on the terminal main body portion 17 of the terminals 16a to 16d and the board mounting terminal portion 19 are separated from each other, and the winding ends are wound around the winding processing terminal portion 18. At this time, the board mounting terminal portion 19 does not get in the way.

Further, the fitting recess 1 is formed on the upper surface of the bobbin 12.
A lead wire passage 20 is provided which is formed of a gap communicating with the lead wire 3. The lead wire passage 20 is a passage for guiding the lead wires 22 of the winding start end and the winding end end of the coil 21 wound around the core 11 to the winding processing terminal portion 18, and has an arc portion so that the lead wire 22 is not broken. 20a is formed.

The lead wire 22 of the coil 21 derived from the primary winding and the secondary winding wound around the core 11 is soldered in a state of being twisted to the winding processing terminal portion 18 through the lead wire passage 20. To be done. The board mounting terminal portion 19 is reflow soldered to the board.

Further, since the core 11 is made of a magnetic material having a high electric insulation as described above, the coil 21 is wound after the inner insulating tape is wound around the core 11, and the coil 21 is further wound. An outer insulating tape 23 is wound around the outer periphery of the. The coil 21 has a slightly arcuate outer periphery due to winding, but the outer insulating tape 23 forms a flat surface 23a on the upper surface.

Thus, the flat surface 2 is formed on the upper surface of the trigger coil.
Forming 3a has an effect that the trigger coil is easily chucked when vacuum chucking and transferring.

As described above, the winding processing terminal portion 18 in which the lead wire 22 derived from the primary winding and the secondary winding is twisted and soldered to the terminal 16 and the board mounting terminal for reflow soldering to the board. By integrally providing the portion 19 and projecting the board mounting terminal portion 19 along the bottom surface of the bobbin 12,
The height of the trigger coil can be reduced and the size can be reduced. Therefore, the occupied area of the trigger coil with respect to the substrate can be reduced, and the mounting density of electronic components can be increased.

By bending the board mounting terminal portion 19 along the bottom portion 15a of the bobbin 12, the area occupied by the trigger coil on the board can be reduced and the mounting density of electronic components can be increased.

In the first embodiment, the bobbin 1 is provided with the fitting recess 13 into which both ends of the core 11 are fitted.
Two side surfaces and an upper surface facing each other were opened, and both ends of the core 11 were inserted into the fitting recess 13 from above the bobbin 12 to be adhesively fixed. However, the bobbin 12 may be provided with a fitting hole in the side surface facing each other, and both ends of the core 11 may be inserted from the side of the bobbin 12 and fixed by adhesion.

[0027]

As described above, according to the present invention, the bobbin is fixed to both ends of the rod-shaped core to form the winding frame. In this state, the primary winding and the winding 2 are formed on the core. A trigger coil can be formed by winding a coil composed of a secondary winding. Therefore, the trigger coil can be downsized, and the assembling workability can be improved.

Further, since the board mounting terminal portion is provided on the bottom portion of the bobbin and the winding processing terminal portion is provided on the side portion, soldering can be performed all at once by reflow when mounting on the wiring substrate. You can

[Brief description of drawings]

FIG. 1 shows a trigger coil according to a first embodiment of the present invention, (a) is a plan view, (b) is a side view, and (c) is a left side view.

FIG. 2 is a perspective view of the trigger coil of the same embodiment.

FIG. 3 shows a conventional trigger coil, (a) is a perspective view,
(B) is a vertical sectional side view.

[Explanation of symbols]

11 ... Core 12 ... Bobbin 13 ... Fitting recess 16a to 16d ... Terminal 18 ... Winding terminal part 19 ... Board mounting terminal 21 ... Coil

Claims (4)

[Claims] 1. A rod-shaped core, a pair of bobbins fixed to both ends of the core, terminals inserted in the bobbins, the bottom of which has a board mounting terminal portion and the sides of which have winding processing terminal portions. A trigger coil comprising: a coil, which is wound around the core and has a winding start terminal and a winding end terminal connected to the winding processing terminal portion, the coil including a primary winding and a secondary winding. 2. The bobbin has a fitting recess into which both ends of the core are fitted, and both ends of the core are adhesively fixed to the fitting recess. Trigger coil. 3. The trigger coil according to claim 1, wherein the bobbin is provided with a lead wire passage for guiding a winding start end and a winding end end of the coil to the winding processing terminal portion. 4. The trigger coil according to claim 1, wherein the coil is covered with an exterior insulating tape, and a flat surface is formed on an upper surface.