JPH09219325A - Coil bobbin for transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate disordered wire winding on a high pressure side coil and provide a bobbin which quickly performs wire winding by forming a recessed part, which has a width almost equal to the wire winding width of a low pressure side coil or slightly wider and a depth almost equal to the diameter of conductor wire or slightly deeper, at the center of the coil bobbin. SOLUTION: At the center of the external plane of a bobbin 1, a recessed part 7 which stores a low pressure side coil is formed in a strip-shape in the circumference direction. Since the low pressure side coil is formed by winding conductor wire with a diameter of approximately 0.5mm approximately five turns, the dimensions of the recessed part 7 are approximately 3.0mm in width and approximately 0.7mm in depth. Grooves 70 and 70 are formed from low pressure side coil hooks 8 and 8 to the recessed part 7 in the shaft direction of the bobbin 1. The dimensions of the groove 70 is approximately 0.7mm in width and depth. The conductor wire is bent at the connecting part of the groove 70 and the recessed part 7 in the circumference direction, is wound five turns on the recessed part 7, is bent in the shaft direction of the bobbin 1 at the connecting part of the recessed part 7 of another groove 70 and is stored in the groove 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil bobbin for a high voltage transformer used in electronic equipment such as a liquid crystal projector.

[0002]

2. Description of the Related Art A transformer comprises a magnetic circuit using an iron core and two or more coils linked to the magnetic circuit. In a high voltage transformer, an insulating coil bobbin (1) is arranged around an iron core, and a low voltage side coil (2) is formed on the outer surface of the bobbin (1).
Next, the high voltage side coil (3) is formed. In order to form the low-voltage coil (2), conventionally, as shown in FIG. 4, a hook (8a) provided at the end of the bobbin (1) is hooked with a conductor (20) and bent 90 degrees, Orient it in the axial direction of the bobbin (1). Attach the conducting wire (20) to the bobbin (1) near the center of the bobbin (1) using the insulating tape (6).
After fixing to, the conductor wire (20) is bent in the circumferential direction of the bobbin (1). After winding the conductor wire (20) for several turns, bend it in the axial direction of the bobbin (1) and fix it to the bobbin (1) with the insulating tape (6).
The conducting wire (20) is hooked on the hooking piece (8b) provided at the other end of the bobbin (1). Next, in order to form the high voltage side coil (3), after winding the insulating film (4) around the entire peripheral surface of the bobbin (1), the high voltage side conducting wire (30) is connected to the low voltage side coil (2). In the same manner, hang it on the hooking piece (90), fix it to the bobbin (1) with the insulating tape (6), and then wind more than the low voltage side coil (2). Then, while sandwiching the insulating film (4) on the winding,
(30) is wound and laminated, and this is repeated several times.

[0003]

In order to obtain a high voltage using a transformer, the number of turns of the high voltage side coil (3) is set to the low voltage side coil.
It is necessary to make it much larger than the number of turns in (2). Therefore, the winding width b of the high voltage side coil (3) is
Is larger than the winding width a of the bobbin, and as a result, as shown in FIG. 5, the lead wire (30) for the high-voltage coil (3) is wound in a state where the central portion of the outer surface of the bobbin (1) is swollen. , Winding disorder is likely to occur. Therefore, the characteristics of the transformer become unstable. In addition, it is necessary to carefully wind the conducting wire (30), and the work is not efficient.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a bobbin (1) capable of promptly winding a coil without causing winding disorder in the high voltage side coil (3).

[0005]

[Means for Solving the Problems] In the central portion of the coil bobbin,
A recess having a width substantially the same as or slightly larger than the winding width a of the low voltage side coil and a depth substantially the same as or slightly larger than the diameter of the conductor wire is formed. Further, a groove having a width and a depth substantially the same as or slightly larger than the diameter of the conducting wire is formed from the latching piece for the low voltage side coil to the recess.

[0006]

Since the low-pressure side coil can be housed in the recess, the conducting wire of the high-voltage side coil can be wound without bulging at the center of the bobbin, and the winding disturbance of the high-voltage side coil can be prevented. In addition, work can be performed efficiently. Further, the groove formed from the latching piece for the low voltage side coil to the recess can accommodate the conducting wire for the low voltage side coil, so that it is not necessary to fix the conducting wire with the insulating tape, and the number of working steps can be reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a coil bobbin (1) of the present invention.
The bobbin (1) is integrally formed of plastic or the like and used in a high voltage transformer for lighting a projection discharge lamp used in a liquid crystal projector.

The conventional bobbin (1) is formed in a cylindrical shape,
Both ends are formed so that the ferrite cores fit into each other. Lead wire for high voltage side coil (3) laminated on bobbin (1)
Bobbin to hold (30) and insulating film (4)
A plurality of protruding pieces (10) are projected at both ends of (1).
In this embodiment, the bobbin (1) has a diameter of about 10 mm and a height of about 10 mm.
It is 20 mm, and four projecting pieces (10) at one end project outward by about 5 mm at 90 degree intervals in the circumferential direction, and at the same position in the circumferential direction at the other end as well. The protruding piece (10) is protruding. Similarly, a low-voltage coil retaining piece (8) and a high-voltage coil retaining piece (9) are formed at the end of the bobbin (1). The hooking pieces (8) and (9) are plate pieces (80) and (90) respectively protruding outward from the end of the bobbin (1) and the plate pieces.
A small piece (81) (9) protruding axially outward from the tip of (80) (90)
1) and near the base end of the small pieces (81) (91), the plate piece (8
The slits (82) and (92) are formed on the side surfaces of the (0) and (90). The latching pieces (8) and (9) for the low voltage side coil and the high voltage side coil are formed at positions convenient for the configuration and wiring of the electronic device (in this embodiment, the liquid crystal projector). For example, as shown in FIG. 1, each of the latching pieces (8) and (9) is formed at both ends, and the latching pieces (9) and the protruding pieces (10) on the upper side of the figure are formed.
a) is integrally formed.

At the center of the outer surface of the bobbin (1), a recess (7) for accommodating the low voltage side coil (2) is formed in a band shape in the circumferential direction. In this embodiment, the low-voltage coil (2) has a diameter of about 0.5 m.
Since the conductive wire (20) of m is wound about 5 times, the recessed portion (7) has a width of about 3.0 mm and a depth of about 0.7 mm. Furthermore, a latching piece for the low voltage side coil
(8) From the (8) to the recess (7), the groove (7
0) (70) is formed. In this embodiment, the groove 70 has a width and depth of about 0.7 mm.

Next, a procedure for winding the wire around the coil bobbin (1) to form the coils (2) and (3) will be described. Low voltage side coil
To form (2), as shown in FIG. 2, the conducting wire (20) is wound from the outside on the small piece (81) of the low-voltage coil retaining piece (8a), and the slit of the retaining piece (8a) is formed. It is passed through (82), bent in the axial direction of the bobbin (1) and stored in the groove (70). At the joint of the groove (70) and the recess (7), the conductor wire (20) is bent in the circumferential direction of the bobbin (1) to form the recess.
After being wound about 5 times with (7), it is bent in the axial direction of the bobbin (1) at another joint portion of the groove (70) and the recess (7) and stored in the groove (70). Then, the conducting wire (20) is passed through the slit (82) of another hooking piece (8b) and wound around the small piece (81) of the hooking piece (8b).
The high voltage side coil (3) is conventionally formed. That is,
After winding the insulating film (4) such as polyester film around the entire circumference of the bobbin (1), connect the conducting wire (30) to the coil on the low voltage side.
Hang it on the hooking piece (9) and bend it in the axial direction of the bobbin (1) in the same way as (2). The conductive wire (30) is fixed to the bobbin (1) using the insulating tape (6) and then wound around substantially the entire circumferential surface to form a single layer winding. Then, the insulating film (4) is wound on the winding wire, the conducting wire (30) is further wound and laminated, and this is repeated several times. By arranging the ferrite core (5) that penetrates the coil bobbin (1) on which the coils (2) and (3) are formed as described above and is coupled outside the bobbin (1), A high voltage transformer like the one below is completed.

Therefore, the recess (7) and groove (70) of the bobbin (1)
Since the conductor wire (20) of the low voltage side coil (2) can be housed in the bobbin (1), the conductor wire (30) of the high voltage side coil (3) and the insulating film (4) can be accommodated in the bobbin (1) as shown in FIGS. It can be wound without bulging in the central part of the coil, and winding disturbance of the high voltage side coil (3) can be prevented. Since the winding disorder can be prevented, the work can be performed efficiently, and the variation in the characteristics of the transformer can be reduced, and the transformer having the predetermined characteristics can be stably supplied. Further, the groove (70) formed on the bobbin (1)
As a result, when winding the conducting wire (20) of the low voltage side coil (2) around the bobbin (1), it is not necessary to fix the conducting wire (20) with the insulating tape (6), and as a result, the working process can be reduced. .

As in the above embodiment, the width and depth of the recess (7) and groove (70) of the bobbin (1) are set so that the conducting wire (20) of the low voltage side coil (2) can be accommodated. Is desirable. However, as far as the shape of the bobbin (1) allows,
Even if it is larger than that, the swelling of the winding can be prevented in the same manner, so that the above effect can be realized.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. or,
The configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a perspective view showing a coil bobbin of the present invention.

FIG. 2 is a front view of FIG. 1, in which a low voltage side coil is wound.

3 is a cross-sectional view taken along the line AA of FIG. 2, in which a coil on the high voltage side is further wound.

FIG. 4 is a front view showing a conventional coil bobbin in which a low voltage side coil is wound.

5 is a cross-sectional view taken along line BB of FIG. 4, in which a coil on the high voltage side is further wound.

FIG. 6 is a perspective view showing a transformer using the coil bobbin of the present invention.

[Explanation of symbols]

 (1) Coil bobbin (2) Low voltage side coil (3) High voltage side coil (4) Insulating film (7) Recess (8) Low voltage side coil retaining piece (9) High voltage side coil retaining piece (70) Groove

Claims (2)

[Claims] 1. A center portion of a transformer coil bobbin (1),
For a transformer in which a recess (7) having a width substantially the same as or slightly larger than the winding width a of the low voltage side coil (2) and a depth substantially the same as or slightly larger than the diameter of the conductor wire (20) is formed. Coil bobbin. 2. A width and a depth substantially the same as or slightly larger than the diameter of the conducting wire (20) from the latching piece (8) for the low voltage side coil formed at the end of the bobbin (1) to the recess (7). The coil bobbin for a transformer according to claim 1, wherein a groove (70) is formed.