Transformer

Details Transformer Transformer

1998-07-08

2001-06-26

Mai, Anh (Department: 2832)

Inductor devices

Winding with terminals, taps, or coil conductor end...

C336S208000, C336S198000

Reexamination Certificate

active

06252484

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transformer, and more particularly to a split-winding pulse transformer.
2. Description of the Related Art
A conventional split-winding pulse transformer from which a variety of outputs for use in a video taper recorder can be obtained will now be described with reference to FIGS.
9
(A) and
9
(B).
FIG.
9
(A) is a front view showing a conventional split-winding pulse transformer and FIG.
9
(B) is a rear view of the same.
The conventional split-winding pulse transformer includes a core portion
10
disposed vertically, a terminal frame
20
for holding the lower portion of the core portion
10
, a plurality of primary-terminal portions
30
and a plurality of secondary-terminal portions
31
provided below the terminal frame
20
in a dual in-line configuration, a bobbin portion
11
received by a core member of the core portion
10
, and a base winding
12
, primary windings
13
and
15
and secondary windings
14
wound around the bobbin portion
11
.
In order to generate a plurality of voltage levels (four voltage levels in FIGS.
9
(A) and
9
(B)) required in a video tape recorder, the conventional split-winding pulse transformer has a structure in which four types of secondary windings
14
are wound around the bobbin portion
11
in a stacked manner. The four types of secondary windings
14
are wired to reach the secondary-terminal portions
31
across the primary winding
13
, the base winding
12
and the terminal frame
20
which are disposed below the secondary windings
14
.
The base winding
12
is wired to reach the primary-terminal portions
30
across the terminal frame
20
.
The primary winding
13
is wired to reach the primary-terminal portions
30
across the base winding
12
and the terminal frame
20
.
The other primary winding
15
is wired to reach the primary-terminal portions
30
across the secondary windings
14
, the base winding
12
, the primary winding
13
and the terminal frame
20
.
However, the conventional split-winding pulse transformer requires wiring from each winding to predetermined terminal portions
30
(or
31
) across the other windings and the terminal frame
20
. Therefore, the wiring after winding and arrangement of the wires are too complicated to realize satisfactory workability. What is worse, design of the wiring requires a long time and excess wiring must be performed. In addition, there is apprehension that the wire is damaged when the wiring operation is performed.
On the other hand, a transformer has been disclosed in Japanese Utility Model Examined Publication No. Sho. 36-24294, the transformer being arranged in a manner that the central axes of windings are positioned horizontally with respect to a printed circuit board. The transformer has a plurality of projecting terminal portions each of which is formed at the lower end portion of two side walls of a bobbin around which the windings are wound. Moreover, the leading ends of the windings are connected to the terminal portions. Mounting of the transformer on the printed circuit board is performed by inserting the terminal portions into cut holes formed in the printed circuit board and by dipping it into a soldering dip vat.
Although such a transformer may be able to overcome the above-described problems, it is not a split-winding transformer. Moreover, strength for mounting the transformer on the printed circuit board is unsatisfactory.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a split-winding transformer having a structure with which the productivity can be improved and the cost can be reduced and which can strongly be mounted on a mounting subject, such as a printed circuit board.
In order to achieve the above object, the present invention provides a transformer arranged to be mounted on a subject, such that a central axis of a winding thereof is positioned horizontally, the transformer comprising: a bobbin portion having three or more flange portions which are formed perpendicular to the central axis and each of which has terminal, portion provided with a projection, integrally extended from a lower end portion thereof; and two or more windings, each having leading ends wound around the bobbin portion across one of the flange portions, wherein the terminal portions are connection terminal portions with a substrate on which the transformer is mounted.


REFERENCES:
patent: 3760339 (1973-09-01), Marshall
patent: 3792398 (1974-02-01), Norlin et al.
patent: 3939450 (1976-02-01), Donnelly
patent: 4047138 (1977-09-01), Steigerwald
patent: 5200731 (1993-04-01), Tochio et al.
patent: 5281942 (1994-01-01), Stokes
patent: 5315280 (1994-05-01), Stokes et al.
patent: 5570075 (1996-10-01), Krimmer et al.
patent: 36-24294 (1960-02-01), None
patent: 2-35423 (1990-03-01), None
patent: 2-60208 (1990-05-01), None
patent: 4-56303 (1992-05-01), None
patent: 7-86054 (1995-03-01), None
patent: 40 90 97728A (1997-04-01), None

Affiliated with

Also associated with

Rating

Transformer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Transformer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transformer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2448175