Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J31/00—Cathode ray tubes; Electron beam tubes
  • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
  • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
  • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J31/00—Cathode ray tubes; Electron beam tubes
  • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
  • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
  • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
  • H01J31/123—Flat display tubes
  • H01J31/124—Flat display tubes using electron beam scanning

Definitions

• the present invention relates to a cathode ray tube, and particularly to a flat type cathode ray tube.
• the area around the electron beam emission end of the electron gun on the inner surface of the tube body An inner conductive film is applied on the entire inner periphery from the electron gun to the fluorescent surface, and a high voltage constant voltage is applied to the inner conductive film, and an electron beam emitted from an electron gun is applied.
• the room is designed to be stable and able to face the phosphor screen.
• this figure shows the oblique view of the first helicopter and the longitudinal cross-section of the second heir.
• a flat cathode ray tube consisting of a flat glass tube body was devised.
• this tube was (1), the first and second are Nursing joined sealed I by the unfavorable Tsu preparative with the power sale by forming a flat space (7) ⁇ therebetween and ⁇ each other 2 (2j and (3), and the first and The other side of the second panel sections (2) and (3) is similarly formed by the funnel section (4) joined and sealed by flitting. is there.
• This funnel portion (4) has the first and second panel portions (2) and (3) joined and sealed at its large-diameter side open end (4a), and the small-diameter open end thereof. (4b) is welded to the neck part where the electron gun (6) is housed and arranged.
• the i-th and second panel portions (2) and () have main surfaces (2a) and (3a) facing each other and a fan thereof. Except for the side joined to the nut portion (4), each of the other three sides has peripheral sides (2b) and (3b) extending from the green, and these peripheral sides (2b) and (3b) 3b), the end faces facing each other are fitted together to form a flat space (7) between the two panel sections (2) and), and this flat space is formed.
• the peripheral surfaces (2b) and (3b) of the panel parts (2) and (3) are connected so that the flat funnel-like space of the funnel part (4) communicates with (7).
• the large-diameter open end (4a) of the fan hole part (4) is joined and sealed by means of a flit, and the first panel part (the surface of 2j) (The fr on the surface of 2a is, for example, A conductive layer (8) is formed, and a fluorescent screen (9) is formed on the conductive layer (8).
• the protective film (lit)) was surprised, and a vapor-deposited film of the transparent conductive layer 111) was deposited thereon, for example, over the entire inner surface of the first panel portion.
• An inner conductive film (13) made of a carbon coating film or the like is applied to the inner surface of the inner part (4).
• An anode button (14) for supplying a high voltage is provided, for example, on one side of the fan hood (4) by being electrically connected to the internal conductive film (13). This ensures that the required high anode voltage is applied through the conductive film (13) to the transparent conductive film (11), and thus to the phosphor screen (9) and also to the high voltage electrode of the electron gun (6). Is made.
• the surface (2a) of the first panel part (2) is placed on the tube (2a) so that the fluorescent surface (9) formed on the inner surface faces the axis of the electron gun (6). As it reaches the tip side of 1), that is, toward the side opposite to the side where the electron gun (6) is arranged, it is curved so as to approach or cross the tube axis.
• the emitted electron beam is formed, for example, so as to impact on the center of the phosphor screen (9) in a non-polarized state.
• the electron beam emitted from the electron gun (6) is provided, for example, around the welded portion between the funnel (4) and the neck (5).
• Horizontal and vertical scanning over a predetermined area on the fluorescent screen (9) is performed by the horizontal and vertical electromagnetic leakage means (17), and the fluorescent screen is excited by the impact of the electron beam.
• the luminous image emitted from (9) is observed, for example, on the surface (3a) of the second panel (3).
• the first and second panel portions (2) and (3) and the funnel portion to which the neck portion (5) is welded) are joined together.
• the path of the electron beam on the light-emitting surface side is made of a conductive film to which a high voltage is applied as described above. It is thought that it is desirable to prevent the electric field from being disturbed to the electron beam path by enclosing it.
• a transparent conductive film (12) is deposited on the inner surface of the second panel portion (3) also over the entire area thereof. Higher pressure than the node button (14) will be applied.
• the transparent conductive films (11) and (12) applied on the inner surfaces of the first and second panel portions (2j and) are connected to the funnel portion (4 ) Is electrically connected to the inner conductive film (13), so that a high voltage is applied, but each conductive film (11), (12), (13) has The junctions of the panel part (23) and the funnel part (4) due to the flipping are interposed, and these conductive films (ii) ⁇ 2) and (13) are electrically conductive.
• the conductive layers (13), (11), and (12) are electrically applied to the conductive layers (13), (11), and (12) so as to cross over the portions.
• the entire periphery of the electron beam path toward the phosphor screen that is, the entire periphery of the flat space is surrounded by the conductive film as described above.
• the work is complicated, and in addition, after the panel part (2) and (3) are fitted with the funnel part (4), the The operation of applying the two connecting conductive layers (15) and (16) such as a force-bonded coating film over the flit attachment part is extremely complicated and hinders mass productivity.
• the present invention seeks to reduce the area covered with the transparent conductive film as much as possible to reduce the cost and reduce the workability, thereby improving the reliability.
• a conductive film is provided all around the phosphor screen side passage of the electron beam and a state where a predetermined voltage is applied to the conductive film is set. Even if it is not held, it is determined that the electric field in the electron beam path can be stabilized, and a configuration based on this is taken.
• the first panel is referred to.
• the material layer that generates secondary electrons due to the impact of the electron beam is exposed on the entire or at least a part of the scanning area where the electron beam is impacted.
• at least the transparent inner conductive film is not formed at least on the second panel portion side, but an insulative surface such as a glass, which is a constituent material of the panel portion itself, is formed.
• this secondary electron is emitted by the scanning of the phosphor screen by the electron beam, that is, after the start of the operation of the electron tube, this secondary electron is emitted.
• the secondary electrons are accumulated so as to cover the insulating surface of the inner surface of the second panel portion, so that a constant potential state can be given to the inner surface. . -Simple description of the drawing
• FIGS m1 and 2 are a perspective view and a longitudinal sectional view of a flat cathode ray tube for explaining the present invention
• FIG. 3 is an exploded perspective view of the cathode ray tube body
• FIG. 1 is a longitudinal sectional view of an example of a tube according to the present invention.
• the tube (1) is composed of the first and second panel sections and the phantom welded to the neck tube (5) that contains the needle i i6J. Since the screw (4) and the screw (4) are joined together by means of a flit, etc., the part corresponding to FIG. 2 in FIG.
• the inner surface of the second panel portion is covered with the transparent conductive film (12) described in FIG. Exhaust the entire surface of the panel so that the surface of the glass, such as a glass material, is directly exposed and faces the fluorescent screen (8).
• the position where the electron beam b from the electron gun (6) is bombarded that is, the entire area corresponding to the scanning area of the electron beam or at least a part thereof.
• the surface layer is composed of a material with a relatively high secondary electron emission ratio.
• the transparent conductive material is a composite oxide of a material having a relatively high secondary electron emission ratio, such as In and Sn.
• This transparent conductive film is formed on the entire inner surface of the first panel portion (2j, for example) as described above.
• the transparent conductive film is formed as described above with reference to FIG.
• the transparent conductive film (13) of the funnel portion (4) is electrically connected to the internal conductive film (13) by the coupling conductive layer (13) applied after the flit. It is possible to apply a high pressure such as an anode button (14) to the fluorescent surface (9) through the transparent conductive film (11). Although it is formed over the protective film ⁇ formed on the surface (9), the surface of the fluorescent surface (9), that is, the surface of the electrodeposited film of the phosphor powder is actually fine. With irregularities On the other hand, the protective film (10) and the transparent conductive film (11) formed thereon are efficiently excited by the phosphor screen (9) by the electron beam. Yo
• the surface is formed to be sufficiently thin, its surface is not completely covered by the transparent conductive material: ⁇ ttl) and is microscopically protected by the protective film ttO) or the phosphor of the phosphor screen (9). Is partially exposed.
• the phosphor is formed from these intermediates, and furthermore, the phosphor itself forming the Yingkou surface (9) itself is formed of a sulfide having a high secondary electron emission ratio.
• the material surface from which secondary electrons are emitted by the impact of the electron beam is exposed to the scanning area of the electron beam, so that the operation of the cathode ray tube starts.
• secondary electrons are emitted, and this is, for example, directed toward the inner surface of the second panel portion (3) opposed thereto and accumulated there, and the potential of the secondary electrons is Because of the high pressure, the inside of the pipe can maintain a stable state of constant high pressure in a short time. Therefore, the same effect can be obtained without providing a transparent conductive film to which a high voltage is applied in the second panel portion (3) as in the conventional case.
• the transparent conductive film is formed on the entire inner surface of the panel 1 (2j).
• this is formed only on the fluorescent surface and
• the high EE circuit to be formed may be formed by a carbon layer, etc.
• a part of the first panel is also a part of the constituent gas. Las, or naked
• the required charged state is formed by the accumulation of the secondary electrons generated from the above-described electron beam scanning area, and the charged state is formed in the path of the electron beam. There is no disturbance of the electric field.
• the inside of the tube is stabilized by secondary electron emission, but this stabilization is relatively short after the start of operation of the cathode ray tube because the space inside the tube is a flat space. Between them, it was confirmed that the glass exposed part in the tube was covered with secondary electrons, and a stable charged state, that is, equilibrium was reached.
• a so-called reflective cathode ray tube in which the emission optical image by the fluorescent screen is reflected from the side opposite to the panel having the fluorescent screen.
• the present invention is not limited to such a reflective configuration.
• the conductive layer (8) on the side having the bright surface (9) is a transparent conductive film and the surface of this panel portion is It goes without saying that the same effect can be obtained by applying the present invention to a so-called see-through type cathode ray tube in which light emission from the outer light surface is observed from the outer surface of (2a). Yes.
• the present invention can be applied to various types of cathode ray tubes in which the first and second panel portions are opposed to each other and are not limited to the river described above, and the same effect can be obtained. That's right.

Landscapes

• Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
• Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=12836190

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (6)

Family Cites Families (2)

• 1983
  • 1983-03-24 JP JP58049617A patent/JPS59175547A/ja active Granted
• 1984
  • 1984-03-20 KR KR848401409A patent/KR910005077B1/ko not_active Expired
  • 1984-03-23 AU AU33956/84A patent/AU572199B1/en not_active Expired
  • 1984-03-23 EP EP84901230A patent/EP0139760B1/en not_active Expired
  • 1984-03-23 US US06/945,239 patent/US4723090A/en not_active Expired - Lifetime
  • 1984-03-23 DE DE8484901230T patent/DE3471814D1/de not_active Expired
  • 1984-03-23 WO PCT/JP1984/000131 patent/WO1984003796A1/ja active IP Right Grant
  • 1984-03-23 AU AU33956/84D patent/AU3395684A/en active Granted

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