Flyback transformer

Details Flyback transformer Flyback transformer

1998-07-02

2001-02-13

Gellner, Michael L. (Department: 2832)

Inductor devices

Combined

With connector

C336S096000, C336S010000

Reexamination Certificate

active

06188303

ABSTRACT:

This application corresponds to Japanese Patent Application No. 9-183740, filed on Jul. 9, 1997, which is hereby incorporated by reference in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a flyback transformer which is used in a television receiver and other devices, and more particularly, to the structure of an anode lead wire used for connecting the flyback transformer and a cathode ray tube (CRT).
2. Description of the Related Art
Hitherto, flyback transformers have been installed in television receivers or display apparatuses. In such an application, a high output voltage is applied from high-tension coils (e.g., secondary coils) used in the flyback transformers to anodes used in cathode ray tubes through anode lead wires. In recent years, a so-called anode-lead-wire-post-mounting technique has become prevalent as a step in the assembly of television receivers and like display apparatuses. In this process, the anode lead wire is mounted to the flyback transformer after the flyback transformer has been installed in the television receiver or display apparatus so as to facilitate assembly.
FIG. 6
shows the connection mechanism of an anode lead wire in a conventional flyback transformer produced by the above-described technique of anode-lead-wire-post-mounting. The connection mechanism used to connect the anode lead wire
51
is mainly composed of the anode lead wire
51
, an anode lead holder
52
and a conductive rubber member
53
(e.g., conductive rubber member
53
may comprise rubber or other resilient material with conductive material added thereto). The anode lead holder
52
is formed in a cylindrical shape and is made of an insulating resin material. The anode lead holder
52
has engagement pieces
54
having resilient properties when extended in an inward (radial) direction. The engagement pieces
54
project from the inner surface of the anode lead holder
52
. The anode lead wire
51
is inserted from one opening (the right end in
FIG. 6
) of the anode lead holder
52
, and the conductive rubber
53
is pressed into the other opening (the left end in
FIG. 6
) and fixed thereto. A high-voltage lead wire
58
for providing a high voltage output from a high-tension coil (e.g., a secondary coil) is thrust into the conductive rubber
53
. The inner diameter “b” of the anode lead holder
52
is defined by the size of a connecting fitting
57
mounted to the head of the anode lead wire
51
.
As shown in
FIG. 7
, an insulating film
55
at the head of the anode lead wire
51
is removed to expose a core wire
56
. In addition, a metal connecting fitting
57
is attached to the head. To attach the connecting fitting
57
to the anode lead wire
51
, the edges of the connecting fitting are tapered so that they cut into and engage the insulting film
55
. Also, the core wire
56
and connecting fitting
57
are secured by solder
59
.
A series of operations used to secure the anode lead holder
52
to the anode lead wire
51
will now be described. The anode lead wire
51
having the connecting fitting
57
attached to the head thereof is first inserted from one opening (e.g., the right opening) of the anode lead holder
52
. When the connecting fitting
57
engages the engagement pieces
54
, the connecting fitting
57
is advanced so as to gradually expand the space between the tips of the engagement pieces
54
, and the head of the core wire
56
is thrust into the conductive rubber
53
. When the connecting fitting
57
is advanced such that the portion thereof which cuts into the insulating film
55
passes the tips of the engagement pieces
54
, the engagement pieces
54
return to their original state as a result of the elastic restoring force thereof. In this state, the engagement of the connecting fitting
57
with the engagement pieces
54
allows the anode lead wire
51
to be retained. That is, the engagement pieces
54
thereby prevent the anode lead wire
51
from falling out, so that the anode lead wire
51
is held and fixed to the anode lead holder
52
.
The conventional flyback transformer encounters at least the following problems.
The connecting fitting
57
is required to be attached to the head of the anode lead wire
51
, so that the number of components is increased and the operation of mounting the connecting fitting
57
requires much labor, resulting in an increase in cost.
In addition, it is necessary to widen the inner diameter “b” of the anode lead holder
52
to accommodate the relatively large size of the connecting fitting
57
, resulting in an increase in size of the anode lead holder
52
.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a flyback transformer in which the head of the anode lead wire can be easily processed, and in which the connection mechanism for connecting the anode lead wire to the anode lead holder can be reduced in size.
According to an exemplary aspect of the present invention, there is provided a flyback transformer including a transformer section including a magnetic core incorporated into a coil. An anode lead wire is composed of a core wire and an insulating film for covering the core wire. The anode lead wire is used for supplying a high output voltage generated in the transformer section to a CRT. A cylindrical anode lead holding means is provided which has at least one engagement piece which is elastic in at least the radial inward direction of the anode lead holding means. The at least one engagement piece projects from the inner surface of the anode lead holding means and holds the anode lead wire. The anode lead wire has a groove formed on a part of or around the whole circumference of the insulating film. The groove engages with the at least one engagement piece, whereby the anode lead wire is securely held by the anode lead holding means.
According to another exemplary aspect of the present invention, there is provided a flyback transformer including a transformer section formed by a magnetic core incorporated into a low-tension coil part and a high-tension coil part. The anode lead wire is composed of a core wire and an insulating film for covering the core wire and for supplying a high output voltage generated in the transformer section to a CRT. A cylindrical anode lead holder is provided having at least one engagement piece which is elastic in at least the radial direction of the anode lead holder. The at least one engagement piece projects from the inner surface of the anode lead holder and holds the anode lead wire. A conductive rubber member is provided on a high voltage extraction portion of the transformer section and is electrically connected to the core wire of the anode lead wire. The anode lead wire has a groove formed on a part of or around the whole circumference of the insulating film. The groove engages with the at least one engagement piece, whereby the anode lead wire is held by the anode lead holder.
With the described arrangements, by only partially removing the insulating film of the anode lead wire to form the groove, without attaching a connecting fitting to the head of the anode lead wire, the anode lead wire can be fixed to the anode lead holder without incurring the disadvantages discussed above.


REFERENCES:
patent: 3585450 (1971-06-01), Lane
patent: 3766505 (1973-10-01), Sato et al.
patent: 3813574 (1974-05-01), Sato
patent: 4074210 (1978-02-01), Otake et al.
patent: 4408176 (1983-10-01), Nakamura
patent: 5532669 (1996-07-01), Tsunezawa et al.
patent: 5-101861 (1993-04-01), None
patent: 8-83726 (1996-03-01), None
patent: 9-134833 (1997-05-01), None

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