JPS59127348A - Deflection device - Google Patents

Abstract

PURPOSE:To obtain a deflection device small-sized and not damaging the shape of electron beams by conforming to the shape from the neck part to the funnel part of a cathode-ray tube and constituting it of a funnel-shaped magnet sheet magnetized for deflecting correction. CONSTITUTION:A sheet 4 is molded into the funnel shape of rubber ferrite or plastic ferrite so as to conform to the shape from the neck part to the funnel part of a flat tube 1 while having the thickness of 0.5mm.-1.0mm.. Said sheet 4 is double-polarly magnetized of the poles N and S generating a magnetic field in one direction for deflecting correction. When magnetizing said sheet 4, for instance as shown in the figure, the N pole and the S pole of the electromagnets 5a and 5b are opposedly arranged while putting the sheet 4 between in the diametrical direction of the sheet 4 and magnetizing from one end face to the other end face along the peripheral surface. By providing the flat tube 1 with such a deflection device, the electron beam (e) emitted from an electron gun 2 is deflected in one direction by the magnetic field for deflecting correction of the sheet 4 so as to collide with the picture screen.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a deflection device for use in cathode ray tubes.

BACKGROUND ART AND PROBLEMS Currently, in order to obtain a portable television receiver, an abbreviated flat cathode ray tube, so-called slanitron tube, as shown in FIG. 1 has been proposed. In Figure 1, (1
) indicates the Suranitron tube, and this Suranitron tube (1)
is parallel to the image receiving surface from the electron gun (2) installed inside the tube.
C emits an electron beam e, and this emitted electron beam e
The electron beam e is deflected by a deflection device (3) comprising a deflection yoke or the like so that the electron beam e collides with the image receiving surface. In the deflection device (31VC) of such a Suranitron tube (1), in addition to deflecting the electron beam e for red scanning according to the signal, it also deflects the electron beam e emitted from the electron gun (2) in one direction. A deflection is necessary to deflect the beam so that it collides with the image receiving surface.

OBJECTS OF THE INVENTION In view of the above, an object of the present invention is to provide a deflection device that is compact and does not impair the shape of an electron beam.

Summary of the Invention The present invention is a deflection device constructed of a funnel-shaped magnetic sheet that conforms to the shape of a cathode ray tube from the neck part to the funnel part and is magnetized for deflection correction. According to the method, it is possible to obtain a small-sized device without damaging the shape of the electron beam.

Embodiment Hereinafter, an embodiment of the deflection device of the present invention will be described with reference to FIGS. 2, 3, 4, and 5. Second
In the figures, FIG. 3, FIG. 4, and FIG. 5, parts corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

In Figures 2 and 3, (4) indicates the sheet as a whole, and this sheet (4) is made of rubber ferrite or plastic ferrite to fit the shape from the neck part to the funnel part of the Suranitron tube (1). Thickness 0
．． Form into a funnel shape using 5u to 1.0mm.

This sheet (4) is magnetized with two poles, an N pole and an 8 pole, which generate a magnetic field in one direction for deflection correction. When magnetizing this sheet (4), for example, as shown in FIG. 4, electromagnets (5a) (5b
) with the N and S poles facing each other and magnetized along the circumferential surface from one end surface to the other end surface, or a sheet (4) made in this way is used as a deflection device as shown in FIG. It is inserted inside the deflection yoke (3) and placed at a predetermined position from the neck part to the funnel part of the sulanitron tube (2), which is a deflection device consisting of the sheet (4), the deflection yoke, etc. Of course, in this case, the direction of the magnetic field of the sheet (4) is 5FC so that the electron beam e can be deflected in the desired direction according to Fleming's left-hand rule. The rest of the structure is the same as before.

If such a deflection device is installed in the Suranitron tube (1), the electron beam e emitted from the electron gun (2) will be
(4) The magnetic field for deflection correction causes the beam to be deflected in one direction so as to collide with the image receiving surface.

As described above (according to the deflection device of this example, it is composed of a funnel-shaped sheet (4) that matches the shape of the gusset from the neck part of the Suranitron tube (1) to the funnel part and is magnetized for deflection correction. However, since this sheet (4) can be inserted inside the deflection yoke, it is possible to obtain a compact deflection device that can deflect the electron beam e with a thinner sheet (4) and a smaller amount of magnetization. In addition, since the sheet (4) can be magnetized from one end surface side to the other end surface side, a uniform magnetic field can be obtained over a wide range, and even when it is desired to deflect the electron beam e by a large angle, the shape of the electron beam e can be can be deflected without damaging it.

The magnetic permeability μ of the sheet (4) can be set to about 1.1, so that the horizontal deflection magnetic field is hardly shunted and the horizontal deflection of the electron beam is
It was found that the same amplitude reduction could be reduced within 10% without any problems.

Furthermore, in the above embodiment, the case was described in which the sheet (4) was used to deflect the electron beam e in one direction in the slanitron tube (1) as shown in FIG. 2, but as shown in FIG. N and S poles for sheet (4)
If 8 poles are alternately magnetized and this magnetized sheet (4) is used in a general cathode ray tube, as shown in Fig. 7 (the raster of rectangle a shown by the solid line is The pincushion-shaped raster shown by the dashed line is formed by arranging magnets Mg to form 8 magnetic poles around the periphery, and these 8 magnetic poles form the pincushion-shaped raster in the direction of arrow F. As a result of the force acting, the pincushion-shaped raster indicated by the dashed line becomes a long sword-shaped raster indicated by the solid line a, thereby making it possible to correct the pink tension distortion.

In addition, when magnetizing the sheet (4) with eight magnetic poles in this way, as shown in FIG. side left and right 4
If the poles are divided and magnetized, distortion can be corrected with a high degree of freedom.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.

Effects of the Invention According to the deflection device of the present invention, it is composed of a funnel-shaped sheet (4) that conforms to the shape of the sulanitron tube (11) from the neck part to the funnel part and is magnetized for deflection correction. Since the sheet (4) can be inserted inside the deflection yoke, it is possible to obtain a compact deflection device that can deflect the electron beam e with a thinner sheet (4) and a smaller amount of magnetization. (4) Since it can be magnetized from one end surface side to the other end surface side, a uniform magnetic field can be obtained over a wide range, and even when it is desired to deflect the electron beam e by a large angle, the shape of the electron beam e will not be damaged. It can be deflected without any deviation.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional side view showing an example of a deflection device for a Suranitron tube, FIG. 2 is a partially cross-sectional side view showing an embodiment in which the deflection device of the present invention is applied to a Suranitron tube, and FIG. FIGS. 4 and 5 are diagrams for explaining the magnetization of the sheet, and FIGS. 6, 7, and 8 are the preferred embodiments of the present invention. FIG. (1) is a Suranitron tube, (3) is a deflection device, and (4) is a sheet. m-2wa Figure 4 Figure 5 Procedural amendment 1. Display of the case Patent Application No. 2479 of 1982 2, Title of the invention Deflection device 3, Person making the amendment Relationship to the case Patent applicant address 6-7-35, Kitashina, Tokyo Parts Co., Ltd. Name (21
B) Sony Corporation Representative Director Norio Ohga (3388) Patent Attorney Sada Ito^5
, date of amendment order: 1925, month, day 6, number of inventions to be increased by the amendment (Fl) In the specification, page 1, line 14, "so-called slanitron tube" is corrected to "(hereinafter referred to as flat tube)" do. (2) Same, page 1, line 15, from the last line of the same page to page 2, line 1,
Page 3, line 4, page 4, line 3, page 7 to line 8, page 5, line 3, and page 6, line 5 "Suranitron tube (1)"
Correct each statement to "flat tube (1)". (3) Same, page 1, line 15, page 6, line 17, same page, line 1
In lines 8 to 19 and page 7, line 5, the words ``suranitron tube'' are corrected to ``flat tube.'' (4) ``Shape of electron beam'' in lines 6 to 7 of page 2 and line 14 of page 2 are corrected to ``shape of electron beam spot'', respectively. (5) Same, page 3, lines 17 to 18 [Suranitron tube (2)” is corrected to “flat tube (1)”. (6) Same, page 4, line 17 and page 6, lines 14 to 15, ``shape of electron beam e'' is corrected to ``shape of electron beam spot.''that's all

Claims (1)

[Claims] A deflection device characterized by comprising a funnel-shaped magnetic sheet that conforms to the shape of a cathode ray tube from the neck section to the funnel section and is magnetized for deflection correction.