EP0348205B1 - Device for suppression of leakage of magnetic flux in display apparatus - Google Patents
Device for suppression of leakage of magnetic flux in display apparatus Download PDFInfo
- Publication number
- EP0348205B1 EP0348205B1 EP19890306338 EP89306338A EP0348205B1 EP 0348205 B1 EP0348205 B1 EP 0348205B1 EP 19890306338 EP19890306338 EP 19890306338 EP 89306338 A EP89306338 A EP 89306338A EP 0348205 B1 EP0348205 B1 EP 0348205B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wires
- crt
- cancelling
- deflecting
- display apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
- H01J2229/0015—Preventing or cancelling fields leaving the enclosure
Definitions
- the present invention relates to a device for the suppression of the leakaye of magnetic flux from a display apparatus using a cathode ray tube (a CRT), and more particularly relates to a device for reducing the leakage flux from the deflecting yoke having deflecting coils in order to deflect the electron beam, and which yives an adverse influence to other apparatus in front of the display apparatus.
- a CRT cathode ray tube
- a display apparatus 1 having a CRT 2 uses magnetic fields occurring by coils of a deflecting yoke 3 in order to deflect the electron beam from an electron gun 4.
- a display apparatus 1 having the above configuration has a problem that the magnetic flux leaks out of the apparatus by causiny a current to flow in the coils of the yoke 3 and thereby generate a magnetic field.
- the leakage flux occasionally gives an adverse influence to the operation of other apparatus. Furthermore, it is serious for the leakage flux to give an adverse influence not only to peripheral apparatus but also to persons in front of the display apparatus 1.
- the object of the present invention is to provide a device for suppressing the unnecessary leakage flux from the display apparatus using a location of the wires which is more effective, without obstructing the image plane of the display apparatus, so as to solve the above problems.
- the present invention provides a device for the suppression of leakage flux from a deflecting yoke, which is assembled in a display apparatus having a cathode ray tube (CRT) for displaying an image by emission of an electron gun to a fluorescent screen surface, and said deflecting yoke arranged at a rear portion of said CRT and for deflecting said electron beam; comprising two cancelling wires which are arranged parallel to each other and are disposed at positions on the front surface and inside straight lines extrapolated forward from the top and bottom of the screen of said CRT, each of said cancelling wires being disposed in close vicinity to a respective one of the upper and lower peripheries of a front surface of said CRT for generating cancellation flux to negate the leakage flux from deflecting coils of said yoke, and wherein the upper wire extends horizontally along the upper periphery of said fluorescent screen, and the lower wire extends horizontally along the lower periphery of said fluorescent screen; and a control circuit for controlling said cancellation flux generated
- a deflecting current flows in coils of the deflecting yoke in order to deflect the electron beam in the CRT.
- a part of the magnetic flux occurring in the deflecting yoke by the deflecting current leaks from the fluorescent character display surface of the display apparatus.
- the wires arranged at the above position receive current supply for controlling the occurrence and quantity of the magnetic flux having a direction opposite to the leakage flux from the fluorescent character display surface. The magnetic flux occurring in the wires by the current supply cancels or negates the leakage flux from the deflecting yoke.
- the present invention has the excellent effect that the leakage flux from the fluorescent surface can be reduced without any obstacle being disposed in front of the effective picture area of the CRT.
- the leakage flux out of the display apparatus can be sharply reduced in all directions.
- the present invention is effective in reducing the leakage flux to the standards of the VDE - Verband Deutscher Elektrotechniker (Union of Electric Engineers of Germany) of West Germany.
- FIGS. 2 and 3 are perspective illustrations showing an embodiment according to the present invention.
- a display apparatus 1 comprises a CRT 2, a deflecting yoke 3, an electron gun 4, cancelling wires 5a and 5b for generating cancellation flux to cancel leakage flux, a variable or fixed inductor 6 connected in parallel with the wires 5a and 5b, and a horizontal deflection circuit 10 for controlling the cancelling wires 5a and 5b.
- the circuit 10 comprises an inductor 11, a battery 12, a diode 13, a capacitor 14, and a switching transistor 15.
- the circuit 10 also has a flyback transformer for accelerating an electron beam and for obtaining a high voltage.
- the circuit 10 is connected via the deflecting yoke 3 to a parallel circuit in which the cancelling wires 5a and 5b and the control inductor 6 are connected in parallel.
- FIGS. 1 and 5 are schematic side views showing the CRT 2 and the leakage flux leaking from the horizontal deflecting coils.
- FIG. 5 further shows that the cancelling wires 5a and 5b negate or reduce the leakage flux generated by current supplied to the horizontal deflecting coils.
- the wires 5a and 5b are arranged in front of a face-plate 2a of the CRT 2 as shown in FIG. 3.
- the upper wire 5a is arranged horizontally at the top end of an effective picture area in the face-plate 2a along the horizontal direction.
- the lower wire 5b is arranged horizontally at the bottom end of the effective area of picture in the face-plate 2a.
- a conductor 5 of the cancelling wires 5a or 5b or both may be located at a position in front of a glass face plate 2a of the CRT 2 and over the CRT's own display area, i.e. the conductor 5 is located on or below a level L of a side envelope 2b of the CRT 2 in the side view, in other words over the CRT's fluorescent screen 2c, where the conductor 5 is still covered by a mask portion 20a of the cabinet 20 so that it is not visible to a viewer.
- the level L is a line extrapolated forward from an inner surface of the side envelope 2b at the point where the face plate joins the side envelope of the CRT 2.
- the conductor 5 is placed a distance d from the glass face plate 2a (see Fig. 9).
- the deflecting yoke 3 is assembled in the proximity of the electron gun 4 and deflects the electron beam generated therefrom. Namely, the horizontal deflection circuit supplies the deflecting yoke 3 with current for horizontal deflection. At the same time, the current is supplied to the variable or fixed inductance 6 and both the wires 5a and 5b, so that the suppression device of this invention synchronously operates with the deflecting yoke 3.
- the leakage flux from the deflecting yoke changes according to the shape of the display apparatus and the strength of the deflecting current. Accordingly, the current flowing in the wires may be divided and supplied to the inductor 6 which is connected in parallel with wires 5a and 5b, so that it is possible to change the inductance of the circuit and to regulate the strength of cancellation flux. Since the cancellation flux is well-balanced with the leakage flux, the leakage flux can be minimized.
- the cancelling wires 5a and 5b are disposed a predetermined distance d from the front surfaces 2a as shown in Fig. 9 because this is found to be more effective than the location of the wires as shown in Fig 10, which is an embodiment not falling within the scope of the claims.
- the cancelling wires are arranged at the upper and lower ends in front of the CRT in order to receive little influence from the metal parts, so that the present invention provide the effect that the value of current flowing the wires becomes extremely small.
- the CRT may be further covered by a shield plate 21 which extends up to front end outer rim of the side envelope of the CRT 2.
- the shield plate 21 may cover the wires 5a and 5b as well, or may further extend beyond the front surface of the CRT 2 as shown in FIG. 8B.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Details Of Television Scanning (AREA)
Description
- The present invention relates to a device for the suppression of the leakaye of magnetic flux from a display apparatus using a cathode ray tube (a CRT), and more particularly relates to a device for reducing the leakage flux from the deflecting yoke having deflecting coils in order to deflect the electron beam, and which yives an adverse influence to other apparatus in front of the display apparatus.
- As shown in Figure 1, a
display apparatus 1 having aCRT 2 uses magnetic fields occurring by coils of adeflecting yoke 3 in order to deflect the electron beam from anelectron gun 4. - A
display apparatus 1 having the above configuration, has a problem that the magnetic flux leaks out of the apparatus by causiny a current to flow in the coils of theyoke 3 and thereby generate a magnetic field. The leakage flux occasionally gives an adverse influence to the operation of other apparatus. Furthermore, it is serious for the leakage flux to give an adverse influence not only to peripheral apparatus but also to persons in front of thedisplay apparatus 1. - In conventional devices for reducing the leakage flux, the only known method uses metal plates surrounding the
CRT 2 so as to interrupt the magnetic field. However, it is problem that an image plane cannot be covered by metal plates to stop the leaking magnetic flux, because we as viewers could not view pictures, characters, figures, and so on, which are displayed on display apparatus such as TV picture tubes having a CRT, if the image plane were covered. - On the other hand, it is possible to cover the image plane by a fine mesh which is made of metal and has transparency. However, the mesh makes it hard to recognize the image and has no effect of interrupting magnetic flux of low frequency.
- It has been proposed in WO-A-8705437 to place windings spaced apart from but generally along the top and bottom edges of a cathode ray tube and fed by a current varying in synchronism with the current through the deflection coils of the cathode ray tube with the intention of cancelling the leakage field in front of the screen.
- A similar arrangement is disclosed in EP-A-0235863. Neither of those disclosed the precise positioning of the windings relative to the top and bottom front edge of the cathode ray tube.
- The object of the present invention is to provide a device for suppressing the unnecessary leakage flux from the display apparatus using a location of the wires which is more effective, without obstructing the image plane of the display apparatus, so as to solve the above problems.
- The present invention provides a device for the suppression of leakage flux from a deflecting yoke, which is assembled in a display apparatus having a cathode ray tube (CRT) for displaying an image by emission of an electron gun to a fluorescent screen surface, and said deflecting yoke arranged at a rear portion of said CRT and for deflecting said electron beam; comprising
two cancelling wires which are arranged parallel to each other and are disposed at positions on the front surface and inside straight lines extrapolated forward from the top and bottom of the screen of said CRT, each of said cancelling wires being disposed in close vicinity to a respective one of the upper and lower peripheries of a front surface of said CRT for generating cancellation flux to negate the leakage flux from deflecting coils of said yoke, and wherein the upper wire extends horizontally along the upper periphery of said fluorescent screen, and the lower wire extends horizontally along the lower periphery of said fluorescent screen; and
a control circuit for controlling said cancellation flux generated by said cancelling wires in the manner that said leakage flux from a face-plate of said CRT is reduced by regulation of the current value supplied to said cancelling wires, characterised in that said two cancelling wires are disposed respectively at positions remote from the front surface of said CRT by a predetermined distance d and inside straight lines (L) extrapolated forward from the inner wall of the side envelope at the point where the face plate joins the side envelope of said CRT parallel to the optical axis of CRT. - A deflecting current flows in coils of the deflecting yoke in order to deflect the electron beam in the CRT. A part of the magnetic flux occurring in the deflecting yoke by the deflecting current, leaks from the fluorescent character display surface of the display apparatus. In this invention, the wires arranged at the above position receive current supply for controlling the occurrence and quantity of the magnetic flux having a direction opposite to the leakage flux from the fluorescent character display surface. The magnetic flux occurring in the wires by the current supply cancels or negates the leakage flux from the deflecting yoke.
- As described above, the present invention has the excellent effect that the leakage flux from the fluorescent surface can be reduced without any obstacle being disposed in front of the effective picture area of the CRT.
- Furthermore, if metal plates shield other surfaces without an image display surface of the CRT, the leakage flux out of the display apparatus can be sharply reduced in all directions.
- The present invention is effective in reducing the leakage flux to the standards of the VDE - Verband Deutscher Elektrotechniker (Union of Electric Engineers of Germany) of West Germany.
- In the accompanying drawings:
- FIG. 1 is a schematic side view showing the leakage flux of a general display apparatus;
- FIG. 2 is a rear perspective illustration showing a device for suppression of the leakage flux according to an embodiment of the present invention;
- FIG. 3 is an elevational perspective illustration showing the suppression device shown in FIG. 2;
- FIG. 4 is a circuit diagram showing an equivalent circuit of the suppression device shown in FIG. 3;
- FIG. 5 is a schematic side view showing the condition where the leakage flux is reduced by the cancelling magnetic field generated by the device shown in FIGS. 2 to 4;
- FIGS. 6A and 6B are respectively, a circuit diagram and side view showing the connection and arrangement of cancel coils different from this invention as defined by the claims and corresponding to column II of the table described later;
- FIGS. 7A and 7B are respectively, a circuit diagram and side view showing the connection and arrangement of cancellation coils further differing from this invention as defined by the claims and corresponding to column III of the table;
- FIGS. 8A and 8B are a circuit diagram and side view showing cancellation coils of the embodiment of this invention shown in FIGS. 2 to 5;
- FIG. 9 is a fragmentary view showing a corner portion of a cabinet and a CRT; and
- FIG. 10 is a fragmentary view showing a corner portion of a cabinet and a CRT having wires different from FIG. 9 (An embodiment not falling within the scope of the claims).
- There will be described in detail preferred embodiments of a device for suppression of leakage flux according to the present invention with reference to the accompanying drawings.
- FIGS. 2 and 3 are perspective illustrations showing an embodiment according to the present invention. A
display apparatus 1 comprises aCRT 2, adeflecting yoke 3, anelectron gun 4,cancelling wires wires horizontal deflection circuit 10 for controlling thecancelling wires - As shown in an equivalence circuit of FIG. 4, the
circuit 10 comprises an inductor 11, a battery 12, adiode 13, acapacitor 14, and aswitching transistor 15. Thecircuit 10 also has a flyback transformer for accelerating an electron beam and for obtaining a high voltage. Thecircuit 10 is connected via thedeflecting yoke 3 to a parallel circuit in which thecancelling wires - As a horizontal deflection circuit causes the electron beam to swing in a lateral direction, the
control circuit 10 generates the cancellation flux in a vertical direction where the scanning direction of the electron beam intersects therewith at substantially a right angle. Therefore, horizontal deflecting coils are arranged at both the top and bottom positions of theelectron gun 4. FIGS. 1 and 5 are schematic side views showing theCRT 2 and the leakage flux leaking from the horizontal deflecting coils. FIG. 5 further shows that thecancelling wires - The
wires plate 2a of theCRT 2 as shown in FIG. 3. Theupper wire 5a is arranged horizontally at the top end of an effective picture area in the face-plate 2a along the horizontal direction. Thelower wire 5b is arranged horizontally at the bottom end of the effective area of picture in the face-plate 2a. - As shown in FIG. 9, for effective leakage flux suppression a conductor 5 of the
cancelling wires glass face plate 2a of theCRT 2 and over the CRT's own display area, i.e. the conductor 5 is located on or below a level L of aside envelope 2b of theCRT 2 in the side view, in other words over the CRT'sfluorescent screen 2c, where the conductor 5 is still covered by amask portion 20a of thecabinet 20 so that it is not visible to a viewer. The level L is a line extrapolated forward from an inner surface of theside envelope 2b at the point where the face plate joins the side envelope of theCRT 2. - According to the invention, the conductor 5 is placed a distance d from the
glass face plate 2a (see Fig. 9). - The
deflecting yoke 3 is assembled in the proximity of theelectron gun 4 and deflects the electron beam generated therefrom. Namely, the horizontal deflection circuit supplies thedeflecting yoke 3 with current for horizontal deflection. At the same time, the current is supplied to the variable or fixed inductance 6 and both thewires deflecting yoke 3. - In the side view of the CRT as shown in FIG. 5 to indicate the flux generated by the horizontal deflecting coils and cancelling
wires deflecting yoke 3 and dotted line arrows denote magnetic flux generated by thewires wires - The leakage flux from the deflecting yoke changes according to the shape of the display apparatus and the strength of the deflecting current. Accordingly, the current flowing in the wires may be divided and supplied to the inductor 6 which is connected in parallel with
wires - The effect of the above embodiment is shown in table denoting the strength of the leakage flux according to the difference of the connection between the
deflecting yoke 3 and thecancel wires wires - By the table and FIGS. 6A to 8B, it is better to connect upper and
lower wires plate 2a and at the top and bottom periphery of a front surface of theCRT 2. If thewires wires - The cancelling
wires front surfaces 2a as shown in Fig. 9 because this is found to be more effective than the location of the wires as shown in Fig 10, which is an embodiment not falling within the scope of the claims. - In the suppression device according to the present invention, the cancelling wires are arranged at the upper and lower ends in front of the CRT in order to receive little influence from the metal parts, so that the present invention provide the effect that the value of current flowing the wires becomes extremely small.
- As shown in FIG. 6B, 7B and 8B, the CRT may be further covered by a
shield plate 21 which extends up to front end outer rim of the side envelope of theCRT 2. As shown in FIG. 7B, theshield plate 21 may cover thewires CRT 2 as shown in FIG. 8B.
Claims (7)
- A device for the suppression of leakage flux from a deflecting yoke (3), which is assembled in a display apparatus (1) having a cathode ray tube (CRT) (2) for displaying an image by emission of an electron gun (4) to a fluorescent screen surface (2c), and said deflecting yoke arranged at a rear portion of said CRT and for deflecting said electron beam; the device comprising
two cancelling wires (5a, 5b) which are arranged parallel to each other with the upper wire extending horizontally along the upper periphery of said fluorescent screen, and the lower wire extending horizontally along the lower periphery of said fluorescent screen; and
a control circuit (10) for controlling said cancellation flux generated by said cancelling wires in the manner that said leakage flux from a face-plate (2a) of said CRT is reduced by regulation of the current value supplied to said cancelling wires, characterized in that said two cancelling wires are disposed respectively at positions remote from the front surface of said CRT by a predetermined distance d and inside straight lines (L) extrapolated forward from the inner wall of the side envelope at the point where the face plate joins the side envelope of said CRT parallel to the optical axis of CRT. - A device according to any of the preceding claims, wherein a shield plate (21) covers the surfaces of the CRT other than said front surface of the CKT.
- A device according to claim 2, wherein said shield plate (21) extends forward and beyond said front surface of the CRT to cover said two cancelling wires.
- A device according to claim 1, wherein said control circuit (10) has a fixed inductance (6) for regulating the value of current supplied to said cancelling wires.
- A device according to claim 1, wherein said control circuit (10) has a variable inductance (6) for regulating the value of current supplied to said wires.
- A device according to any of the preceding claims, wherein in the current supplied to said cancelling wires (5a, 5b) flows in the source direction in both of said cancelling wires.
- A device according to any of the preceding claims, wherein said cancellation wires (5a, 5b) are connected in series with the yoke (3) and the control circuit (10).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP156411/88 | 1988-06-24 | ||
JP15641188A JPH027334A (en) | 1988-06-24 | 1988-06-24 | Leakage flux reduction device |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0348205A2 EP0348205A2 (en) | 1989-12-27 |
EP0348205A3 EP0348205A3 (en) | 1990-06-13 |
EP0348205B1 true EP0348205B1 (en) | 1995-10-11 |
Family
ID=15627160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890306338 Expired - Lifetime EP0348205B1 (en) | 1988-06-24 | 1989-06-23 | Device for suppression of leakage of magnetic flux in display apparatus |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0348205B1 (en) |
JP (1) | JPH027334A (en) |
DE (1) | DE68924500T2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5200673A (en) * | 1988-10-31 | 1993-04-06 | Victor Company Of Japan, Ltd. | Method and device for suppression of leakage of magnetic flux in display apparatus |
US5027819A (en) * | 1990-07-12 | 1991-07-02 | Biomagnetic Technologies, Inc. | Measurement of visually induced biomagnetic responses |
JPH05244540A (en) * | 1991-12-14 | 1993-09-21 | Sony Corp | Monitor device |
US5959392A (en) * | 1995-01-24 | 1999-09-28 | International Business Machines Corporation | Cancellation coil arrangement for reducing stray magnetic field emissions from CRT displays |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5166726A (en) * | 1974-12-06 | 1976-06-09 | Tokyo Electric Power Co | TEREBIEIZOHIZUMIBOSHISOCHI |
JPS5574046A (en) * | 1978-11-30 | 1980-06-04 | Toshiba Corp | Deflecting device for cathode-ray tube |
JPS6264024A (en) * | 1985-09-13 | 1987-03-20 | Mitsubishi Electric Corp | Unnecessary radiation preventer |
SE452077C (en) * | 1986-03-04 | 1992-12-07 | Blixt Autovision | DEVICE TO REDUCE UNWANTED LEAKFIELD ACTIVITIES IN FRONT OF CATHEDRAL TUBE SCREEN |
JP2526948B2 (en) * | 1987-12-11 | 1996-08-21 | 三菱電機株式会社 | Color cathode ray tube |
-
1988
- 1988-06-24 JP JP15641188A patent/JPH027334A/en active Pending
-
1989
- 1989-06-23 EP EP19890306338 patent/EP0348205B1/en not_active Expired - Lifetime
- 1989-06-23 DE DE1989624500 patent/DE68924500T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH027334A (en) | 1990-01-11 |
EP0348205A2 (en) | 1989-12-27 |
DE68924500T2 (en) | 1996-03-21 |
EP0348205A3 (en) | 1990-06-13 |
DE68924500D1 (en) | 1995-11-16 |
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