Information
-
Patent Grant
-
6404118
-
Patent Number
6,404,118
-
Date Filed
Friday, March 9, 200123 years ago
-
Date Issued
Tuesday, June 11, 200222 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Patel; Nimeshkumar D.
- Roy; Sikha
Agents
-
CPC
-
US Classifications
Field of Search
US
- 313 440
- 313 442
- 313 410
- 313 414
- 313 412
- 348 829
- 348 830
- 439 547
- 439 554
- 439 567
- 439 571
-
International Classifications
-
Abstract
A deflection yoke for preventing fluctuation of the deflection yoke by maintaining a firmly engaged state while preventing fracture and damage thereof caused by an assembling shock generated when assembling a printed circuit board and a rear cover. The printed circuit board has upper hook flaps protruded from a side surface of the rear cover including a plurality of slide grooves and lower hook flaps provided on the side of the upper hooks for penetrating holes is provided, the hook flaps are composed of supporting ribs and protrusions. Especially, the protrusions of the upper hook flap have an inclined angle to assemble the printed circuit board that is combined the rear cover stably.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection yoke, and in particular, to a deflection yoke for preventing fluctuation of the deflection yoke by maintaining a firm engaged state while preventing fracture and damage thereof caused by an assembling shock generated when assembling the printed circuit board.
2. Description of the Prior Art
In general, a deflection yoke is employed for a TV set or a cathode ray tube (CRT) of a monitor to accurately deflect three-color beams scanned from an electron gun to a fluorescent screen coated on a screen of the CRT. The deflection yoke, which is the most significant factor of the magnetic devices of the CRT, plays a role of deflecting electron beams scanned from the electron gun so that the electric signals transmitted in time series can be reproduced as an image on the screen of the CRT.
To be specific, electron beams emitted from the electron gun travel straight forward the screen due to a high voltage, and illuminate a fluorescent body only at the center of the screen. Therefore, the deflection yoke plays a role of deflecting the electron beams so as to reach the screen in the order of being scanned from outside. This deflection yoke forms a magnetic field and uses a change of progressive direction by receiving power of the electron beams passing through the magnetic field so as to accurately deflect the electron beams to the coated fluorescent screen.
FIG. 1
is a side-elevational view of an ordinary CRT. As shown in
FIG. 1
, a deflection yoke
4
located at an RGB electron gun section
3
of a CRT
1
deflects electron beams scanned from an electron gun
3
a
to a fluorescent screen coated on a screen surface
2
.
This deflection yoke
4
comprises a pair of coil separators
10
symmetrically coupled in upper and lower directions.
The coil separator
10
provided for insulating a horizontal deflection coil
15
and a vertical deflection coil
16
as well as for assembling the same at proper positions comprises a screen section
11
a
engaged with a screen surface of the CRT
1
, a rear cover
11
b
, and a neck section
12
integrally elongated from the central surface of the rear cover
11
b
to be engaged with the electron gun section
3
.
A horizontal deflection coil
15
and a vertical deflection coil
16
are provided on internal and outer peripheral surfaces of the coil separator
10
for forming a horizontal deflection magnetic field and a vertical deflection magnetic field with a power supply applied from outside.
A pair of ferrite cores
14
composed of a magnetic body are provided to surround the vertical deflection coil
16
for consolidating the vertical deflection magnetic field generated from the vertical deflection coil
16
.
When a sawtooth pulse is applied to the horizontal deflection coil
15
and the vertical deflection coil
16
, the deflection yoke
4
comprised as above determines a scanning position on the screen by deflecting the electron beams of red (R), green (G) and blue (B) emitted from the electron gun
3
a
of the CRT due to a magnetic field generated according to the Fleming's left-hand rule.
Meanwhile, the deflection yoke as shown in
FIG. 1
is roughly classified into a saddle-saddle type deflection yoke as shown in
FIGS. 2 and 3
, and a saddle-toroidal type deflection yoke as shown in
FIGS. 4 and 5
in accordance with a winding structure of the coil.
In the saddle-saddle type deflection yoke shown in
FIGS. 2 and 3
, the horizontal deflection coil
15
of a saddle shape is installed on upper and lower sides of the internal periphery of the screen section of the coil separator
10
of a cone shape.
To reinforce the magnetic field of the vertical deflection coil
16
, the ferrite cores
14
of a cylindrical shape are provided on an external surface of the screen section
11
a
of the coil separator
10
.
A coma-free coil (not shown in the drawings) is installed around an external periphery of the neck section
12
of the coil separator
10
for correcting coma generated by the vertical deflection coil
16
.
FIGS. 4 and 5
are views showing an ordinary deflection yoke of a saddle-toroidal type. A horizontal deflection coil is installed on upper and lower sides of the internal peripheral surface of the screen section
11
a
of the coil separator
10
of a cone shape, and the ferrite cores
14
of a cylindrical shape are provided on an outer peripheral surface of the screen section
11
a
. A vertical deflection coil
16
of a toroidal type is wound along the upper and lower sides of the ferrite cores
14
.
A coma-free coil (not shown in the drawings) is additionally installed around the periphery of the neck section
12
of the coil separator
10
for correcting coma generated by the vertical deflection coil
16
.
In the saddle-saddle type deflection yoke and the saddle-toroidal type deflection yoke, a printed circuit board is additionally installed on one side surface of the coil separator
10
for supplying power to the aforementioned horizontal deflection coil
15
and the vertical deflection coil
16
.
FIGS. 6 and 7
are views illustrating assembled states of the printed circuit board in the conventional deflection yoke. As shown in
FIGS. 6 and 7
, a printed circuit board
100
is engaged with a side surface of the rear cover
11
b
of the coil separator
10
for electrically connect the deflection coils and diverse electric automotive equipments.
A plurality of penetrating holes
110
are formed at predetermined positions of the printed circuit board
100
with regular intervals. A pair of hook flaps
200
are protruded from the rear cover lib corresponding to the penetrating holes
110
for fixing the printed circuit board
100
without fluctuation.
Here, in the pair of hook flaps
200
, protrusions
210
having a triangular flap shape, i.e., slopes extended from a front end to a rear end thereof, are formed at end portions thereof so as to be suspended on one side surface of the printed circuit board
100
upon penetration of the penetrating holes
110
.
The pair of hook flaps
200
are distanced to be slightly farther than the distance between the pair of penetrating holes
110
so that one surface perpendicular to the protrusions
210
, i.e., the suspending threshold can support one side surface of the printed circuit board
100
after being elastically inserted to the penetrating holes
110
.
Supporting ribs
220
are elongated to the hook flaps
200
so that the protrusions
210
penetrating the penetrating holes
110
press one side surface of the printed circuit board
100
when in contact with the other side surface of the printed circuit board
100
.
The supporting ribs
220
having a predetermined area in a board plank shape is provided to extensively support one side surface of the printed circuit board.
In other words, the protrusions
210
integrally formed with the hook flaps
200
and the supporting ribs
220
fix the printed circuit board
100
by being in contact with the respective sides of the printed circuit board
100
.
In the conventional deflection yoke having the above construction, the printed circuit board
100
is fixed onto the coil separator
100
, i.e., on the rear cover
11
b
, by being suspended by the hook flaps
200
integrally protruded from the rear cover
11
b
and by being supported by the supporting ribs
220
elongated to the hook flaps
200
.
However, such a conventional deflection yoke poses the following problems as the assembling structure between the printed circuit board
100
and the rear cover
11
b
is made by the pair of hook flaps
200
and the penetrating holes
110
.
To be specific, as shown in
FIG. 7
, a worker needs to forcibly insert the printed circuit board
100
to the hook flaps
200
in order to fix the printed circuit board
100
onto the rear cover
11
b
. In this process, the assembling force laid on the printed circuit board
100
by the worker causes a fracture of the printed circuit board
100
or a deformation of the hook flaps
200
.
Moreover, the printed circuit board
100
and the rear cover
11
b
have a structure of being engaged by the pair of penetrating holes
110
and the hook flaps
200
. Therefore, if a forming dispersion or an assembling dispersion is generated in the penetrating holes
110
and the hook flaps
200
, the printed circuit board
100
is not stably fixed on the rear cover
11
b
but is fluctuated.
The above problems not only increase defective proportion of the products but also notably deteriorate the quality of products due to failure of firmly fixing the printed circuit board
100
onto the rear cover
11
b.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a deflection yoke which can maintain a firm engaged state while reducing fracture and damage of the parts caused by an assembling force laid by a worker when fixing a printed circuit board onto a rear cover.
To achieve the above object, there is provided a deflection yoke, comprising: a coil separator including a screen section engaged with a screen surface of a CRT, a rear cover, and a neck section elongated from a central surface of the rear cover to be engaged with an electron gun section of the CRT; horizontal and vertical deflection coils provided on internal and outer peripheral surfaces of the coil separator for forming horizontal and vertical deflection magnetic fields; a printed circuit board engaged with the rear cover of the coil separator and having a plurality of slide grooves connected to a frame on an upper portion thereof and a plurality of penetrating holes formed beneath the slide grooves at regular intervals for electrically connecting each of electronic parts; upper hook flaps protruded from a side surface of the rear cover to have supporting ribs contacted with one surface of the printed circuit board at one end thereof and protrusions contacted with the other surface of the printed circuit board upon penetration of the slide grooves at the other end thereof; a lower hook flap provided on one side of the upper hook flap to have supporting ribs and protrusions for supporting both side surfaces of the printed circuit board by penetrating the same; and a guiding slope surface formed on the sides of the supporting ribs or protrusions to have a predetermined angle so that the printed circuit board can enter the space between the supporting ribs and the protrusions of the upper hook flaps with a predetermined angle.
The guiding slope surface according to the present invention is characterized by being formed on a side of the protrusions facing the supporting ribs of the upper hook flaps.
The guiding slope surface according to the present invention is further characterized by being formed on a side of the supporting ribs facing the protrusions of the upper hook flaps.
The guiding slope surface according to the present invention is also characterized by being formed within an angle range of 5-60°.
BRIEF DESCRIPTION OF THE DRAWINGS
The above objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1
is a side-elevational view of a CRT in general;
FIG. 2
is a front view of a deflection yoke of a saddle-saddle type in general;
FIG. 3
is a top-plan view of a deflection yoke of a saddle-saddle type in general;
FIG. 4
is a front view of an ordinary saddle-toroidal type deflection yoke;
FIG. 5
is a top-plan view of an ordinary saddle-toroidal type deflection yoke;
FIGS. 6 and 7
are views illustrating assembled states of a printed circuit board in a conventional deflection yoke;
FIG. 8
is a view illustrating an assembled state of a printed circuit board in a deflection yoke according to an embodiment of the present invention;
FIG. 9
is a side-elevational view of a rear cover in
FIG. 8
;
FIG. 10
is a side-elevational view of a printed circuit board as being assembled in
FIG. 8
;
FIG. 11
is a side-elevational view of an assembled printed circuit board in
FIG. 10
; and
FIG. 12
is a side-elevational view of a rear cover according to another embodiment of the present invention in FIG.
9
.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description, same drawing reference numerals are used for the same elements even in different drawings. The matters defined in the description such as a detailed construction and elements of a circuit are nothing but the ones provided to assist in a comprehensive understanding of the invention. Thus, it is apparent that the present invention can be carried out without those defined matters. Also, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
Referring to
FIGS. 1
to
5
, the ordinary deflection yoke
4
shown in
FIG. 1
is located at the RGB electron gun section
3
of the CRT
1
for deflecting electron beams scanned from the electron gun
3
a
to a fluorescent screen coated on the screen surface
2
. In accordance with the winding structure of a coil, deflection yokes are roughly classified into a saddle-saddle type deflection yoke as shown in
FIGS. 2 and 3
, and a saddle-toroidal type deflection yoke as shown in
FIGS. 4 and 5
.
The deflection yoke
4
plays a role of deflecting electron beams emitted from the electron gun
3
a
of R, G, B installed inside of the neck section
12
of the CRT
1
toward left, right, upper and lower directions so as to be collided with an accurate position on the fluorescent surface of the CRT.
FIGS. 2 and 3
are views of a saddle-saddle type deflection yoke. As shown in
FIGS. 2 and 3
, the horizontal deflection coil
15
of a saddle-saddle type is installed on upper/lower sides of inner peripheral surface of the screen section
11
a
of the coil separator
10
of a cone shape, while the vertical deflection coil
16
of a saddle-saddle type is installed on left/right sides of the outer peripheral surface.
To reinforce magnetic field of the vertical deflection coil
16
, the ferrite cores
14
of a cylindrical shape are provided on an outer peripheral surface of the screen section
11
a
of the coil separator
10
.
A coma-free coil (not shown in the drawings) is installed around an external periphery of the neck section
12
of the coil separator
10
to correct coma generated by the vertical deflection coil
16
.
FIGS. 4 and 5
are views of an ordinary saddle-toroidal type deflection yoke. The horizontal deflection coil
15
is installed on upper and lower sides of the inner peripheral surface of the screen section
11
a
of the coil separator
10
of a cone shape. The ferrite cores
14
of a cylindrical shape are provided on an outer peripheral surface of the screen section
11
a
. The vertical deflection coil
16
of a toroidal type is wound along the upper and lower sides of the ferrite cores
14
.
A coma-free coil (not shown in the drawings) is additionally installed around the external periphery of the neck section
12
of the coil separator
10
to correct coma generated by the vertical deflection coil
16
.
In the deflection yokes of a saddle-saddle type and a saddle-toroidal type, a printed circuit board is installed on one side surface of the coil separator
10
for supplying power to the aforementioned horizontal deflection coil
15
and the vertical deflection coil
16
.
Meanwhile, as shown in
FIGS. 8
to
12
, the horizontal deflection coil
15
, the vertical deflection coil
16
, and the printed circuit board
30
for electrically connecting diverse electric automotive products are engaged with a side surface of the rear cover
11
b
of the coil separator
10
. The printed circuit board
30
is constructed so as to receive a power supply from outside.
The printed circuit board
30
engaged with the rear cover
11
b
of the coil separator
10
has a plurality of slide grooves
31
at regular intervals on both side surfaces of an upper portion thereof as shown in FIG.
8
.
The slide grooves
31
are a kind of slits elongated from an upper frame toward a lower side of the printed circuit board
30
as shown in FIG.
8
. According to the present invention, a pair of slide grooves are provided on an upper side of the printed circuit board
30
at regular intervals.
In the printed circuit board
30
, a pair of penetrating holes
32
are formed on a lower side of the slide grooves
31
.
The upper hook flaps
40
and the lower hook flap
45
are provided on the rear cover
11
b
corresponding to the slide grooves
31
and the penetrating holes
32
formed on the printed circuit board
30
to firmly fix the printed circuit board
30
.
Here, the upper hook flaps
40
are formed in a pair on a side surface of the rear cover
11
b
corresponding to the slide grooves
31
of the printed circuit board
30
so as to be inserted to the pair of slide grooves
31
.
In the upper hook flaps
200
, protrusions having a triangular flap shape are formed at end portions thereof so as to be suspended upon penetration of the sliding grooves
31
. Supporting ribs
41
are formed to be vertically elongated from the protrusions at predetermined positions with regular intervals.
The pair of hook flaps
40
are distanced to be slightly wider than the distance between the pair of slide grooves
31
so as to be elastically inserted to the slide grooves
31
.
The supporting ribs
41
formed on the upper hook flaps
40
are extensively in contact with an area adjacent to the inner side of the printed circuit board
30
to prevent fluctuation of the printed circuit board
30
together with the protrusions, and have a board plank shape of being parallel with the ordinary printed circuit board
30
.
The supporting ribs
41
are formed to have a board plank shape in a horizontal direction opposed to one end of the upper hook flaps
40
as shown in FIG.
8
. However, the shape of the supporting ribs
41
is not limited to the board plank shape but may be variable provided that the structure of the shape can firmly support the other surface of the printed circuit board
30
.
If the protrusions formed at the end portion of the upper hook flaps
40
penetrate the slide grooves
31
, one side surface of the protrusions is in contact with one surface of the printed circuit board
30
. At this stage, the supporting ribs
41
formed at regular intervals with the protrusions are in contact with the other surface of the printed circuit board
30
.
The printed circuit board
30
is thus fixed onto the upper hook flaps
40
by a contact of the both side surfaces thereof centering around the slide grooves
31
with the supporting ribs
41
and the protrusions of the upper hook flaps
40
.
Meanwhile, protrusions of a triangular flap shape are formed at an end portion of the lower hook flaps
45
formed on a lower side of the upper hook flaps
40
, as in case of the upper hook flaps
40
, and supporting ribs
46
are formed at regular intervals with the protrusions.
The lower hook flaps
45
are distanced slightly farther than the distance between the pair of penetrating holes
32
formed on a printed circuit board
30
so as to be elastically inserted to the penetrating holes
32
.
The supporting ribs
46
formed on the lower hook flaps
45
are extensively in contact with an area adjacent to the inner side of the printed circuit board
30
to prevent fluctuation of the printed circuit board
30
together with the protrusions, and have a board plank shape of being parallel with the ordinary printed circuit board
30
.
The supporting ribs
46
are formed to have a board plank shape in a horizontal direction opposed to one end of the pair of lower hook flaps
45
as shown in FIG.
8
. However, the shape of the supporting ribs
46
is not limited to the board plank shape but may be variable provided that the structure of the shape can firmly support the other surface of the printed circuit board
30
.
If the lower hook flaps
45
constructed as above penetrate the penetrating holes
32
of the printed circuit board
30
, one surface of the protrusions is in contact with one surface of the printed circuit board
30
, while the supporting ribs
46
are in contact with the other surface the printed circuit board
30
.
Thus, the printed circuit board
30
is fixed onto the lower hook flaps
45
by a contact of both side surfaces thereof centering around the penetrating holes
32
with the supporting ribs
46
and the protrusions of the lower hook flaps
45
.
The upper hook flaps
40
and the lower hook flaps
45
are respectively inserted to the slide grooves
31
and the penetrating holes
32
formed on the printed circuit board
30
so as to firmly fix the printed circuit board
30
.
Meanwhile, to facilitate assembly of the printed circuit board
30
, a guiding slope surface
50
having a slope angle ranged about 5-60° is formed on one side of the protrusions as shown in FIG.
9
.
This means that the guiding slope surface
50
formed on one side of the protrusions of the upper hook flaps
40
allows the printed circuit board
30
to enter the cleavage between the protrusions and the supporting ribs
41
of the upper hook flaps
40
with a predetermined angle as shown in FIG.
10
.
The guiding slope surface
50
can not only be formed on the protrusions of the upper hook flaps
40
but also may be formed on a side surface of the supporting ribs
41
facing the protrusions of the upper hook flaps
40
as shown in FIG.
12
.
An assembling process of the printed circuit board in a deflection yoke according to the present invention will now be described.
In order to fix the printed circuit board
30
onto the rear cover
11
b
, an upper portion of the printed circuit board
30
shown in
FIG. 10
, i.e., the pair of slide grooves
31
, are inserted to the pair of upper hook flaps
40
formed on a side surface of the rear cover
11
b.
Since the guiding slope surface
50
having a slope surface of a predetermined angle is formed on the protrusions of the pair of upper hook flaps
40
, the slide grooves
31
can be easily inserted along one end of the upper hook flaps
40
with no difficulty if the printed circuit board
30
inserted between the protrusions and the supporting ribs
41
of the upper hook flaps
40
is inclined with an entry angle, i.e., with an angle inclined for assembly.
Subsequently, if the slide grooves
31
of the printed circuit board
30
are suspended between the protrusions and the supporting ribs
41
of the upper hook flaps
40
, the lower side of the printed circuit board
30
is moved toward the lower hook flaps
45
centering around the suspended part, i.e., centering around the upper hook flaps
40
and the slide grooves
31
.
Then, the penetrating holes
32
of the printed circuit board
30
approach the lower hook flaps
45
, and the lower hook flaps
45
cause a slightly elastic displacement along the slope surface of the printed circuit board
30
so that the lower hook flaps
45
can be inserted to the penetrating holes
32
as shown in FIG.
11
. At the same time, the slide grooves
31
are completely inserted and fixed onto the upper hook flaps
40
.
Accordingly, fracture of the printed circuit board
30
can be prevented in advance as the shocking force and external force generated during an assembly are reduced because the penetrating holes
32
are fixed onto the lower hook flaps
45
under the state that the printed circuit board
30
is inclined and the upper hook flaps
40
having the guiding slope surface
50
have entered the slide grooves
31
.
The assembling efficiency of the printed circuit board
30
thus being drastically improved, productivity of the printed circuit board
30
can also be enhanced, and a low quality of the product caused by fracture of the printed circuit board and the hook flaps in the assembling process can be prevented in advance.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims
- 1. A deflection yoke comprising:a coil separator including a screen section engaged with a screen surface of a CRT, a rear cover, and a neck section elongated from a central surface of the rear cover to be engaged with an electron gun section of the CRT; horizontal and vertical deflection coils provided on inner and outer peripheral surfaces of the coil separator for forming horizontal and vertical deflection magnetic fields; a printed circuit board engaged with the rear cover of the coil separator to have a plurality of slide grooves connected to a frame on an upper portion thereof, and a plurality of penetrating holes formed on a lower side of the slide grooves at predetermined intervals for electrically connect each of electronic parts; upper hook flaps protruded from a side surface of the rear cover and have supporting ribs contacted with one surface of the printed circuit board at one end thereof and protrusions contacted with the other surface of the printed circuit board at the other end thereof upon penetration of the slide grooves; lower hook flaps provided on one side of the upper hooks for penetrating the penetrating holes of the printed circuit board to support both side surfaces thereof; and a guiding slope surface formed on the side of the supporting ribs or the protrusions with a predetermined angle so as the printed circuit board can enter the space between the supporting ribs and the protrusions of the upper hook flaps with an inclined angle.
- 2. The deflection yoke of claim 1, wherein the guiding slope surface is formed on the side of the protrusions facing the supporting ribs.
- 3. The deflection yoke of claim 1, wherein the guiding slope surface is formed on the side of the supporting ribs facing the protrusions of the upper hook flaps.
- 4. The deflection yoke of claim 1, wherein the guiding slope surface has an angle ranged 5-60°.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 2000-74925 |
Dec 2000 |
KR |
|
US Referenced Citations (5)
Foreign Referenced Citations (1)
| Number |
Date |
Country |
| 06060826 |
Mar 1994 |
JP |
