JP2549108B2 - Picture tube device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a picture tube device for displaying a large screen by combining a plurality of small display screens, and more particularly to a structure of a deflecting device thereof.

(Prior Art) In recent years, a picture tube apparatus has been actively developed as a high-resolution image display apparatus, and at the same time, various methods for flattening and shortening the length of the picture tube apparatus have been devised and prototyped.
However, a picture tube device that has a simple structure and is easily flattened and shortened in total length has not yet been realized.

On the other hand, a color picture tube in which a continuous display area on the phosphor screen is divided into a plurality of small display areas, and each of the small display areas is divided and deflected and scanned by an electron beam emitted from an arrangement electron gun can be considered. FIG. 2 is a block diagram of the main part of this color picture tube, and FIG. 3 is a horizontal cross-sectional view of FIG. 2 (including some electron beam trajectories). The color picture tube (51) has a rear panel (53) forming a vacuum envelope (52) in order from rear to front, a cathode / heater unit (54), a first grating (55), and a second grating (56). ), An auxiliary deflector (57), a vertical deflector (58), a horizontal deflector (59), a shadow mask (60), a phosphor screen (61), and a front panel (62). Generated by the heater unit (54)
The controlled one electron beam passes through the first grating (55) and the second grating (56), is accelerated and focused, and the auxiliary deflecting device (5
Incident on 7). The electron beam (63) that is incident on the auxiliary deflector (57) and is slightly deflected is substantially three electron beams (63R) (when incident on the vertical deflector (58), including the case where the electron beam (63) is not slightly deflected. 63G) (63B). These substantially three electron beams are shadowed at a predetermined angle.
Impact the phosphor on the phosphor screen (61), which is selected to enter the mask (60) and is provided at a position according to the incident angle,
This is made to emit light. These substantially three electron beams are deflected by a predetermined small display area by a vertical deflector (58) and a horizontal deflector (59).

Further, in this method, a pair of electrostatic deflection plates each having a plurality of rows in the vertical direction and a plurality of columns in the horizontal direction are used to deflect the electron beam for each small display. Therefore, the vertical deflection position and the horizontal deflection position are arranged in series on the orbits sandwiching the orbit of the electron beam. For this reason, compared with the electromagnetic deflection type color picture tube which uses the deflection yoke capable of performing vertical and horizontal deflections at the same position on the orbit of the electron beam, this method has more vertical and horizontal deflections. Space is required.

On the other hand, the shape of the display area that is divided and deflected and scanned, that is, the shape of the inner surface of the vacuum envelope in which the fluorescent screen is disposed simplifies the shape of internal structures such as the electrostatic deflector and further facilitates assembly. Therefore, it is desirable that the surface is as flat as possible.
However, with the recent enlargement of the picture tube device, it is extremely difficult in practice to make the inner surface of the vacuum envelope flat in order to maintain the mechanical strength of the vacuum envelope against atmospheric pressure. Even when the method is applied to a large-sized picture tube device, it is necessary to keep the mechanical strength against atmospheric pressure sufficiently, in particular, to make the inner surface shape projecting to the atmosphere side. On the other hand, as described above, in order to facilitate the design and assembly of the internal structure, it is desirable that all of the internal structure be made of flat plate-shaped members so that the entire structure has a planar shape. However, if this method is realized with a structure configured in a plane and a fluorescent surface arranged on a spherical curved surface, a large difference in image quality occurs between the center and the periphery of the displayed image, and a picture tube device that cannot be used practically, especially The difference is remarkable in a large-sized picture tube device. This difference is the largest factor in resolution quality due to the difference in electro-optical magnification for each small display area. Also, the incident angle of the electron beam differs for each small display, and the non-linear distortion of the resulting raster is also a factor.

Therefore, it is a practical problem to implement this method with a planar structure and a fluorescent screen arranged in a spherical curved surface because the quality of the reproduced image is significantly deteriorated. In order to make the quality of the reproduced image substantially the same in each small display area, it is desirable that the internal structure be a curved spherical surface that conforms to the inner surface shape of the vacuum envelope. However, in this method, in order to perform a predetermined deflection for each small display area, a pair of electrostatic deflection plates are arranged in a plurality of rows in a vertical direction and a plurality of columns in a horizontal direction. It intersects at a position where it crosses the trajectory of the electron beam at the approximate center of the display area. Therefore, it is extremely difficult to construct and assemble the electrostatic deflection plate having such a configuration so as to follow the inner surface shape of the vacuum envelope.

(Problems to be Solved by the Invention) As described above, the electron beam is vertically and horizontally deflected by the vertical deflecting device and the horizontal deflecting device including the pair of electrostatic bias plates. In a picture tube device that arranges a plurality of rows in a horizontal direction and a plurality of columns in the horizontal direction to divide and display a display image in a small display area, the length required for arranging the deflecting device (the length along the electron beam trajectory) is the same as the conventional deflection It is longer than the electromagnetic deflection type picture tube device using the yoke, and there is a problem that it becomes an obstacle for realizing flattening of the picture tube device.

In addition, when the inner surface of the vacuum envelope where the fluorescent screen is arranged is made to project to the atmosphere side in order to obtain sufficient mechanical strength against atmospheric pressure, vertical and horizontal deflection is performed along the inner surface shape. There is a problem in that it is extremely difficult to construct and arrange the device in processing or assembling the members.

Therefore, the present invention provides a picture tube apparatus which can be flattened even in a large picture tube apparatus in which the inner surface shape of the vacuum envelope is projected to the atmosphere side, and which makes it easy to configure and assemble the deflection apparatus. To aim.

[Structure of Invention]

(Means for Solving Problems) The present invention has been made to solve the above problems,
By arranging the coils at the ends or near the ends of the two facing electrode plates that constitute the deflecting device, vertical and horizontal deflection is performed by only one pair of electrode plates. The passing electron beam is subjected to a Coulomb force electrostatically acting in a direction perpendicular to the electrode surface due to the potential difference of the electrode,
It is deflected in the direction perpendicular to the electrode surface.

Further, the electron beam passing between the electrode plates due to the electric field generated between the electrode plates by the magnetic flux generated by the coil receives a Lorentz force electromagnetically acting in the horizontal direction with the electrode plates and is deflected in the horizontal direction with respect to the electrode surface. .

(Operation) By the means described above, the length of the deflector along the electron beam orbit can be reduced to about 1/2 of the case where two sets of electrostatic deflectors are used, and the flattening of the picture tube device can be further realized.

Further, since the vertical and horizontal deflecting devices can be commonly used, it is possible to arrange the deflecting devices, which are conventionally required to have a plurality of rows in the vertical direction and a plurality of columns in the horizontal direction, in parallel only in the horizontal direction. Therefore, if the inner surface of the vacuum envelope has a curvature in only one direction, for example, a columnar shape, a vacuum device can be easily arranged by arranging a plurality of deflection devices in the direction having the columnar curvature. It is possible to form an internal structure that conforms to the shape of the inner surface of the envelope, and it is easy to assemble.

(Example) Hereinafter, the Example of this invention is described in detail.

(Embodiment 1) FIG. 1 is a main part configuration diagram of a picture tube device according to the present invention, and FIG. 4 is a horizontal sectional view (including a part of an electron beam trajectory) of FIG.

This picture tube device (1) comprises a rear panel (3), a cathode / heater unit (4), a first grating (5), and a second grating (constituting a vacuum envelope (2) in order from rear to front. 6), a deflection device (7), a fluorescent screen (8), and a front panel (9). The cathode / heater unit (4) has an oxide cathode that generates an electron beam and a heater that heats this cathode. The first lattice (5) and the second lattice (6) are flat plate electrodes having the same number of electron beam passage holes as the cathode / heater unit (4), and are arranged in 12 rows in the horizontal direction. The thickness of the first lattice (5) is 0.
25 mm, hole diameter is 0.6 mm, and the thickness of the second grating (6) is 0.5 mm,
The hole diameter is 1.0 mm. The phosphor screen (8) is a metal with a horizontal size of 406.4 mm and a vertical size of 304.8 m.
It is composed of backed-up phosphors, and corresponding to the cathode / heater unit, nine in a substantially vertical direction,
It is divided into 12 small display areas in the horizontal direction, the total number of small display areas is 108 (the number of divisions is 108), and the size of the small display area is a square having a side length of 33.9 mm.

 The operating principle of this embodiment will be described below.

The electron beam (10) emitted from the oxide cathode heated by the heater of the cathode / heater unit (4) is controlled by the potential applied to the cathode, and the first grid (5) is maintained at a potential of approximately 0 volt. ), About 50 more
It passes through a second grating (6), which is kept at a potential of 0 volt, where it is accelerated and focused. The electron beam (10) that has passed through the openings of the second grating (6) is incident on the deflecting device (7) and is approximately 5
It is deflected by a predetermined small display area on the phosphor screen (8) kept at kilovolts.

FIG. 5 is a sectional view of the deflecting device (7) of the present invention. The deflecting devices (7) are arranged in parallel in 12 rows in a horizontal direction at a pitch of about 34 mm.

The deflection device (7) includes a pair of deflection electrodes (11a) (11b) formed so as to be substantially along the horizontal ends of the orbits of the electron beam (10) and having ends bent in a substantially vertical direction. An insulator (12) for fixing and electrically insulating the deflection electrode at a predetermined interval, an insulating sheet (13) wound around the end of the deflection electrode, and a coil (magnetic field generating means) wound on the insulating sheet. ) (14). The deflection electrodes (11a) (11b) are high-permeability magnetic substances such as ferrite, and have a certain degree of conductivity on themselves or on the inner surfaces facing each other, and generate eddy currents. A conductive layer (voltage applying means) having a required resistance is formed so that it does not easily occur, and the electrode spacing on the second lattice (6) side is about
The distance between the electrodes on the phosphor screen (8) side is about 2 mm, the length of the electrode plate along the electron beam trajectory is about 30 mm, and the length of the electrode plate in the longitudinal direction (vertical direction) is about 300 mm.

The insulator (12) is a member made of, for example, Teflon, and a portion of the deflection electrode having a shape bent substantially vertically is approximately
It is for fixing at a distance of 1 mm and at the same time maintaining insulation between a pair of deflection electrodes. The insulating sheet (13) is a thin film insulating sheet made of, for example, Kapton (trade name). In this embodiment, a 12.5 μm sheet is wound twice to form the deflection electrodes (11a) (1).
The insulation between 1b) and the coil (14) is maintained. Deflection electrodes (11a) (11b) made of magnetic material are placed on the insulating sheet (13).
A coil (14) for giving a magnetic flux to the coil is wound 50 times, and an insulating layer is applied to the coil formed by the coil (14) in order to maintain insulation between the coil.

FIG. 6 shows a schematic diagram for explaining the operation principle of the deflecting device (7). FIG. 6 (a) shows vertical deflection (electromagnetic deflection), and FIG. 6 (b) shows horizontal deflection (electrostatic deflection), where the electron beam travels in the front direction of the paper surface.

When the electron beam is deflected in the vertical direction (Y-axis direction) in FIG. 6 (a), a coil (magnetic field generating means) (14)
A vertical deflection signal current is applied to the coil, and the magnetic flux generated by the coil generates a substantially uniform deflection magnetic field B between the pair of deflection electrodes (11a) and (11b). The electron beam passing through the deflection magnetic field B receives the Lorentz force F _{V in the} direction orthogonal to the deflection magnetic field B and is deflected in the vertical direction (Y-axis direction).

In FIG. 6 (b), the electron beam is moved in the horizontal direction (X
When deflecting in the axial direction, a pair of deflection electrodes (11a) (1
By applying a horizontal deflection signal voltage (voltage difference) between the conductive layers (voltage applying means) formed on the opposing surfaces of 1b), a substantially uniform deflection electric field E is provided between the pair of deflection electrodes (11a) (11b). Generate. The electron beam passing through the deflection electric field E receives the Coulomb force F _H in the same direction as the deflection electric field and is deflected in the horizontal direction (X-axis direction).

As described above, the electron beam can be deflected by a predetermined small display area of the phosphor screen (8) by applying predetermined deflection signals to the magnetic field generating means and the voltage applying means.

Further, in this embodiment, the coils (14) provided at both ends of the pair of deflection electrodes (11a) (11b) are connected in series, and a deflection current of about 1.2 amperes is caused to flow so that the electron beam is displayed in a predetermined small display. It is possible to deflect to the vertical edge of the area. Further, by applying a voltage difference of about 250 V to the opposing surfaces of the pair of deflection electrodes (11a) and (11b), the electron beam can be deflected to the horizontal end of a predetermined reading area.

As described above, by using the deflecting device (7) composed of a pair of electrode plates as the deflecting means for the electron beam, vertical and horizontal deflection can be performed at the same position, which is effective for downsizing and simplification of the tendency device. Extremely large.

In this embodiment, the coils are provided at both ends of the deflection electrode in order to generate a predetermined deflection magnetic field in the deflection electrode. However, the same effect can be obtained when the coils are provided in only one of the deflection electrodes.

The deflecting device of the present invention can be applied to a color picture tube for deflecting scanning by dividing the display area into a plurality of small display areas by substantially deflecting one electron beam into a plurality of small electron beams in a plurality of stages. .

(Embodiment 2) FIG. 7 shows a second embodiment of the present invention, which corresponds to the above-mentioned first embodiment.
The shape of the deflection electrodes (11a) and (11b) in the above embodiment is changed.

In the deflection electrodes (11a) and (11b) of the first embodiment described above, the electrode intervals are set to be substantially the same in the same vertical row in order to generate a substantially uniform electric field on the facing surface between the electrodes. But,
Not all portions (deflection electrodes) in the same vertical row are used for deflection of the electron beam, and in the present embodiment, only a part of the portion near the second grating operates as a deflection electrode.

Therefore, it is effective to form a deflection magnetic field with a high magnetic flux density only in the portion that actually deflects the electron beam, and to lower the magnetic flux density in the portion that does not participate in the deflection, to enhance the utilization efficiency of the magnetic flux generated from the coil (14). Is.

In the second embodiment, in order to achieve the above-mentioned object, the deflection electrode (16
a) The electrode spacing of (16b) is shaped so as to be substantially along the horizontal end of the trajectory of the electron beam, and the portion not necessary for deflecting the electron beam is shaped so that the electrode spacing is as wide as possible.

By this method, the magnetic flux generated from the coil (17) can be concentrated on the portion that deflects the electron beam.

In the second embodiment, the electrode spacing on the second grating (6) side is about 1 mm in the portion where the electron beam is deflected and in the vicinity thereof, and about 20 mm in the portion where the electron beam is not deflected. The length of the electrode plate along the electron beam orbit is about 30 mm. The magnetic flux density on the second grid (6) side is the part where the electrode interval is narrow (about 1 m
m) and the wide part (about 20 mm) have a ratio of about 1:20. Therefore, the magnetic flux generated from the coil (17) can be concentrated on the portion where the electron beam is deflected, and as a result, the deflection sensitivity to the same deflection signal current is improved by using the second embodiment.

The deflection electrode (16a) (1) around which the coil (17) is wound
6b) Since the end portion is widened in the embodiment of FIG. 5, it is possible to easily wind the coil and to arrange a coil having a large number of turns, so that the deflection efficiency can be improved.

FIG. 8 shows a third embodiment of the present invention, which is the second embodiment described above.
The coil of the above embodiment is arranged in a vacuum envelope.

The deflecting device (18) of the third embodiment comprises deflection electrodes (19a) (19b) arranged inside the vacuum envelope (2) and magnetic field generating means arranged outside the vacuum envelope (2). The magnetic field generating means (20) including (20) includes a magnetic core (21) made of, for example, ferrite, and a coil (22) wound on the magnetic core. The deflection electrodes (19a) and (19b) have the same electrode spacing as the deflection electrodes (16a) and (16b) of the second embodiment, and their ends are upright to the vacuum envelope (22). A deflection signal current is caused to flow through the coil (22) of the magnetic field generating means (20), and the magnetic flux generated from this coil passes through the magnetic core (21) and the deflection electrode (19a) disposed inside the vacuum envelope (2). (19b)
Flow into the magnetic field to generate a deflection magnetic field on the opposite surface of the deflection electrode,
The electron beam passing therethrough is deflected in a direction orthogonal to the direction of the deflection magnetic field.

By using this method, the magnetic field generating means (20) can be disposed outside the vacuum envelope (2), so that the magnetic field generating means (20) can be electrically separated from the voltage applying means, and can be used in the first and second embodiments. It is possible to omit the insulating sheet and the insulator that have been used. Further, by disposing the coil (22) outside the vacuum envelope (2), it becomes extremely easy to dispose the connection line for passing the deflection signal current through the coil.

〔The invention's effect〕

As described above, by using the deflecting device according to the present invention, vertical and horizontal deflection can be performed at the same position, and deflection can be performed as compared with the conventional case where two pairs of electrostatic deflection plates are used for vertical and horizontal deflection. The depth of the device can be reduced to about 1/2, the deflecting device can be downsized and simplified, and the flattening of the picture tube device can be further improved.

Further, since the deflecting devices of the present invention all operate in the same vertical row, for example, the inner surface shape of the vacuum envelope has a curvature only in the horizontal direction, and the curvature of the cylindrical shape is changed to that of the cylindrical shape. By arranging the deflecting device along the line, there is an effect that it can be applied to a large-sized picture tube device. Further, by making the deflection electrode interval in the portion of the deflecting device through which the electron beam does not pass wider than the portion through which the electron beam passes, the magnetic flux density in the portion through which the electron beam passes is increased, and the deflection sensitivity is improved.

Further, by disposing the magnetic field generating means of the deflecting device outside the vacuum envelope, the deflecting electrodes can be electrically separated from each other, which has the effect of simplifying the structure.

[Brief description of drawings]

FIG. 1 is a schematic view of the essential parts of a picture tube device according to the first embodiment of the present invention, and FIG. 2 is a schematic view of the essential parts of a conventional color picture tube.
FIG. 3 is a horizontal sectional view of FIG. 2, FIG. 4 is a horizontal sectional view of a picture tube device of the present invention, and FIGS. 5 and 6 are sectional views of a deflecting device of the present invention. 7 and 8 are perspective views of the deflecting device according to the present invention. (1) …… Picture tube device, (7) (15) (18) …… Deflection device, (14) (17) (22) …… Coil

Claims (3)

(57) [Claims] 1. A vacuum envelope, a phosphor screen arranged in the envelope for displaying a large screen, an electron gun for irradiating the phosphor screen with an electron beam, and a small display of the electron beam on the phosphor screen. Equipped with a deflection device that deflects the electron beam horizontally and vertically so as to hit the area, a plurality of electron guns are arranged in the horizontal direction and in the vertical direction on the same plane, and are displayed in a small display area. In a picture tube device that forms a large screen by synthesizing a small screen, the deflection devices are arranged so as to face each other so as to sandwich an electron beam from an electron gun, and a pair of electrode plates made of a magnetic material and the electron beam are horizontally aligned. Voltage applying means for applying a voltage between the pair of electrode plates so that the electron beam is deflected, and magnetic field generating means for generating a magnetic field between the pair of electrode plates so as to deflect the electron beam in the vertical direction. Each electrode plate is in the same vertical row The cathode ray tube device is characterized in that the pair of electrode plates are commonly connected to each other, and the electrode plate interval of a portion through which the electron beam does not pass is wider than the electrode plate interval of a portion through which the electron beam passes in the same vertical row. . 2. The image receiving device according to claim 1, wherein the magnetic field generating means is a coil arranged in a vacuum envelope and wound around an end of a vertical row of the electrode plate. Tube device. 3. The magnetic field generating means is a coil which is arranged outside the vacuum envelope in the vicinity of the vertical column ends of the electrode plate and which is a wound coil. Picture tube device.