JPS5991644A - Flat plate type cathode-ray tube - Google Patents

Abstract

PURPOSE:To reduce the number of processed deflection plates and electrode leadout wires and simplify a deflection circuit system by emitting an electron beam from a number of linear hot cathodes, deflecting it in a specified direction, and electrically connecting both the front and rear surfaces of the deflection plate that irradiates a phosphor screen. CONSTITUTION:An electron emitted from linear hot cathodes 22 arrives at an electron beam extraction electrode 23 with a number of insertion holes in the same axial direction as the cathodes 22 by controlling the quantity and the angle of radiation in the vertical direction. An electron beam passes through the electrode 23 is focused by a focusing electrode 24 and enters a deflection plate 25 and then is deflected vertically. The deflected beam permits its passing to selectively be controlled by an electrode group 26 and is horizontally deflected and is accelerated, and then arrives at a display board 27 coated with a phosphor layer. The deflection plate 25 is processed by cutting a single metal and both the front and rear surfaces are connected electrically. As a result, the number of processed deflection plates and electrode leadout wires can be reduced and a deflection circuit system can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat cathode ray tube using several linear hot cathodes.

Conventional structure and its problems Conventionally, as a flat cathode ray tube
JP-A No. 55-33734, etc. have been proposed. In this method, a band-shaped electron beam is obtained using an electron source consisting of a linear hot cathode and opposing deflection electrodes sandwiching it, and a potential difference is applied to the deflection electrodes to perform, for example, vertical scanning. The electron beams are deflected by a deflection electrode, and a plurality of sets of phosphors formed on a transparent substrate are caused to emit light by these electron beams, thereby displaying images, two characters, etc. Next, a typical structure of this flat cathode ray tube will be explained. In Figure 1,
Reference numeral 1 denotes a back electrode, which is constructed by forming a conductive film such as a metal film or a transparent conductive film on the inner surface of a metal plate or an envelope (not shown) of the cathode ray tube by means such as vacuum evaporation or sputtering. It serves to suppress the electron beam generated from the linear hot cathode 2 in a predetermined direction. The linear hot cathode 2 is
A tungsten wire with a diameter of 10 to several tens of micrometers is coated with an oxide electron emission ratio of several micrometers to several 107 = 1, and by applying a predetermined voltage to both ends of the linear hot cathode 2,
Heating to 00-800°C generates uniform electrons from the oxide electron emission. The control electrode 3 is an electrode for extracting electrons generated in the linear hot cathode 2, and is connected to the through hole 3.
' is provided corresponding to the linear hot cathode. Through hole 3'
The dimensions, quantity, etc. of the electron beam are determined depending on the number of required electron beam spots, the magnitude of the electron beam current, etc. 4
is a vertical deflection plate that deflects electron beams in a direction perpendicular to the screen, and conductive electrodes 4 are formed on the surface (both sides) of a substrate made of an insulating material by means such as vacuum evaporation or screen printing.
' is formed. Reference numeral 6 denotes a control electrode, which has the role of controlling the flow of the electron beam (for example, turning ON or OFF). 7 are electrodes for accelerating the electron beam, and 7 is a horizontal deflection electrode for deflecting the electron beam in the horizontal direction with respect to the screen, which has a comb-shaped shape divided into two parts. 8
9 is an electrode for accelerating the electron beam; 9 is a transparent substrate (glass); a face plate, which is usually the envelope of a cathode ray tube, is used; on the vacuum side of the transparent substrate 9 there is a phosphor layer and an aluminum layer; A light emitting section 10 is formed of a metal back layer made of a thin film, and a high voltage (6 to 2 degrees KV) is applied to the metal bank layer as well as the accelerating electrode 8. FIG. 2 is an enlarged view of the vertical deflection plate 4 portion. The vertical deflection plate 4 is made by depositing metal 12 on both upper and lower surfaces of an insulating substrate 11 made of glass, ceramic, etc., and the metal 12 on the upper and lower surfaces are insulated from each other. The second step of adding this vertical deflection plate 4 is as follows:
Three steps are required: 1. Cutting and evaporation of the metal 12 on the front and back surfaces, and the number of steps is large.7. , if the number of vertical deflection plates 4 is n, a large number of 2 (n-1) pieces are required, and the deflection voltage waveform is a sawtooth wave with a steep rise, requiring a wideband amplifier, making it complicated and expensive. I had no choice but to adopt a new structure.

Exactly the same thing can be said about the horizontal deflection plate.

Purpose of the Invention The present invention solves the above-mentioned problems of flat cathode ray tubes, and reduces the number of man-hours for processing the deflection plate and the number of electrode lead wires.
Furthermore, it is an object of the present invention to simplify the configuration of the deflection voltage amplifier.

Structure of the Invention The present invention is structured such that the front and back electrodes of the deflection plate are not separated.1.
Alternatively, the deflection plate is made of a single metal.

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail based on embodiments. FIG. 3 is a perspective view showing the main parts of a flat cathode ray tube according to the present invention.

The amount and vertical radiation angle of the electrons emitted from the linear hot cathode 22 are controlled according to the magnitude of the potential of the back electrode 21, and a plurality of electrons are emitted in the same axial direction as the linear hot cathode 22. The electron beam reaches an electron beam extraction electrode 23 having a through hole.

The electron beam that has passed through the electrode 23 enters the deflection plate 25 while being focused according to the strength of the electric field between it and the focusing electrode 24, and is deflected in the vertical direction. At the electrode group 26, the electron beam reaches a phosphor surface 27 coated with a phosphor layer while its passage is selectively controlled, horizontally deflected, and accelerated.

FIG. 4 is an enlarged sectional view of the deflection plate 25 of FIG. 3, which is processed by cutting or pressing a single metal. The deflection plate formed by pressing has the effect of reducing the weight of the device.

This deflection plate 25 differs from the conventional example in that the upper and lower surfaces of the same deflection plate are not insulated and are made of a single metal.
If we let n be the number of
) The difference is approximately half that of a book, and as the number of deflection plates 26 increases, the difference becomes more significant.

The lead-out legs s 2 tJ of the deflection plate 26 are alternately connected, and triangular wave deflection voltages 34 and 35 whose inclination directions are opposite to each other are applied to the iE lines 37 and 38 connected to each other.

When the electron beam 33 emitted from any linear hot cathode among the plurality of linear hot cathodes 22 enters the deflection plate 25,
After being deflected from the second limit to the lower limit of the deflection range by the deflection waveforms 34 and 36, the electron beam 33 is interrupted and the next deflection of the electron beam 36 is started. In this case as well, the deflection waveforms 34 and 35 simply repeat the same waveforms and the electron beam 3
It becomes possible to deflect the deflection range of 6.

In the embodiment shown in FIG. 4, the deflection plate 26 is made of the same metal, but even if a conductive layer of metal or the like is formed on the entire surface of an insulator having the same shape, the same effect can be obtained. .

Further, in the embodiment shown in FIG. 4, the cross-sectional shape of the deflection plate 25 is hexagonal in order to increase the deflection efficiency, but the same effect can be obtained with deflection plates having other shapes as well. However, in order to increase the deflection efficiency, it is desirable that the thickness t on the electron beam incident side be larger than the thickness t2 on the emission side.

In the above explanation, we took the vertical deflection plate as an example, but the same applies to the horizontal deflection plate.

Effects of the Invention As described above, the present invention provides a flat hot cathode ray tube in which electron beams are emitted from a plurality of linear hot cathodes, and the electron beams are deflected vertically and horizontally to irradiate a fluorescent surface. It is also a flat hot cathode ray in which both the front and back sides of the deflection plate are electrically connected, which reduces the number of processing steps and reduces the number of lead wires for applying deflection voltage compared to conventional deflection plates. Furthermore, the sawtooth wave that conventionally required a broadband deflection voltage amplifier is unnecessary, and it is now possible to deflect with a simple triangular wave, making it possible to have a simple and inexpensive deflection circuit system. can.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the configuration of the main parts of a conventional flat hot cathode ray tube, Fig. 2 is an enlarged sectional view of the deflection plate portion of Fig. 1, and Fig. 3
This figure is a perspective view showing the configuration of the main parts of an embodiment of the flat hot cathode ray tube of the present invention, and FIG. 4 is an enlarged view of the deflection plate section of the configuration shown in FIG. 3. 11 Insulating substrate, 12... Vapor deposited metal, 13 Deflection waveform, 14 Drawer grinding, 21 Back electrode, 22--linear hot cathode, 23 Electron beam extraction electrode, 24
Focusing electrode, 26 Deflection plate, 26 Electrode group, 27.
Display board, 32/Leader line, 33.36 Electron beam, 34°36 Deflection voltage. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure #; 4 Figure Procedure Amendment Document 1988 Ta Month 720 Commissioner of the Japan Patent Office 1988 Patent Application No. 2014 To 2 Name of the invention Flat cathode ray tube 3 Person making the amendment 1'1- Opening of the patent Out
16iIi Address 1006 Oaza Kadoma, Kadoma City, Osaka Name (582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita 4 Agent 〒571 Address 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Contact information - L story (Tokyo) 437-1121 J Kyoto Law Branch" 5 Subject of correction

Claims (1)

[Scope of Claims] (1) A plurality of linear hot cathodes, a back electrode that pushes out an electron beam generated from the linear hot cathodes in a predetermined direction, and a back electrode arranged corresponding to the electron beam, What is claimed is: 1. A flat cathode ray tube comprising: a plurality of deflection plates that deflect electron beams in a predetermined direction; and a fluorescent surface that receives the electron beam; both front and back surfaces of the deflection plates are electrically connected. (A flat cathode ray tube according to claim 1, in which the deflection plates are formed by cutting or pressing a single metal. (4) A flat cathode ray tube according to claim 1. (4) A plurality of deflection plates are connected every other time, and a triangular wave voltage having an inclination in the opposite direction is applied to each of the deflection plates. The flat cathode ray tube according to item 1.