CN114944315A

CN114944315A - Cathode ray tube with a shadow mask having a plurality of apertures

Info

Publication number: CN114944315A
Application number: CN202210482991.6A
Authority: CN
Inventors: 赵健; 朱滨; 夏忠平
Original assignee: Shanghai Jiyouwei Optoelectronics Technology Co ltd
Current assignee: Shanghai Jiyouwei Optoelectronics Technology Co ltd
Priority date: 2022-05-05
Filing date: 2022-05-05
Publication date: 2022-08-26

Abstract

The embodiment of the application provides a cathode ray tube, which comprises a glass bulb, a light emitting structure layer, an electron gun and an electric lead assembly electrically connected with the electron gun; the glass envelope comprises a tubular part and a fluorescent screen part connected with the tubular part; an electron gun disposed in the tubular portion for emitting an electron beam toward the phosphor screen portion; the light-emitting structure layer is arranged on the fluorescent screen part and emits ultraviolet light under the excitation of the electron beams; the electron gun is electrically connected with the outside through an electric lead assembly; the glass shell also comprises a sealing part which is connected with one end of the tubular part far away from the fluorescent screen part; the electric lead assembly penetrates through the closed part, so that one end of the electric lead assembly is exposed out of the closed part, and the other end of the electric lead assembly is connected with the electron gun in the tubular part; the material of the fluorescent screen part, the tubular part and the closed part is quartz glass or sapphire crystal; the glass envelope encloses a sealed inner space by the fluorescent screen portion, the tubular portion and the closing portion.

Description

Cathode ray tube having a shadow mask with a plurality of apertures

Technical Field

The present invention relates to the field of light emitting devices, and more particularly, to a cathode ray tube.

Background

The ultraviolet light source has wide application prospect in the fields of sterilization, surface modification, ultraviolet communication and the like, and the traditional ultraviolet light source mainly comprises a mercury lamp, an ultraviolet LED and an ultraviolet excimer lamp. The mercury lamp contains mercury, and mercury pollution is easily caused in the production and use processes; the ultraviolet LED has low conversion efficiency and high production cost; the ultraviolet excimer lamp has short service life and high cost.

A cathode ray tube is a device that uses electron beams to excite phosphors to achieve luminescent display, and is commonly used in display devices. Recently, device studies on the use of a cathode ray tube for ultraviolet light emission have been actively conducted; however, the cathode ray tube for realizing ultraviolet light emission has great differences from the conventional cathode ray tube for developing in structure, performance and product requirements. There are many technical problems to be overcome in the realization of the ultraviolet light emitting cathode ray tube, such as: the packaging difficulty is high, the luminous efficiency is not ideal, the luminous energy is low, the industrialization is difficult, the production cost is high, and the like.

Disclosure of Invention

In view of the above, embodiments of the present application provide a cathode ray tube to solve at least one of the problems in the related art.

To achieve the above object, embodiments of the present application provide a cathode ray tube including: the device comprises a glass shell, a light emitting structure layer, an electron gun and an electric lead assembly electrically connected with the electron gun;

the glass envelope comprises a tubular part for accommodating the electron gun and a fluorescent screen part connected with the tubular part;

the electron gun is arranged in the tubular part and is used for emitting electron beams to the fluorescent screen part;

the light-emitting structure layer is arranged on the fluorescent screen part and emits ultraviolet light under the excitation of the electron beams;

the electron gun is electrically connected with the outside through the electric lead assembly;

the envelope further comprises a closing portion connected to an end of the tubular portion remote from the phosphor screen portion, the closing portion being configured to effect port sealing of the end of the tubular portion remote from the phosphor screen portion and to effect extraction of the electrical lead assembly from within the tubular portion to outside the tubular portion;

the electric lead assembly penetrates through the closed part, so that one end of the electric lead assembly is exposed out of the closed part, and the other end of the electric lead assembly is connected with the electron gun in the tubular part;

the materials of the fluorescent screen part, the tubular part and the closing part are all quartz glass or sapphire crystals;

the glass envelope is enclosed into a sealed inner space through the fluorescent screen part, the tubular part and the sealing part, the inner space of the glass envelope is in a vacuum state, and the air pressure of the inner space of the glass envelope is 10 ^-3 ～10 ^-6 Pa.

The cathode ray tube provided by the embodiment of the application comprises a glass shell, a light-emitting structure layer, an electron gun and an electric lead assembly electrically connected with the electron gun, wherein ultraviolet light is emitted in a mode that the electron gun emits electron beams to excite the light-emitting structure layer. The fluorescent screen portion, the tubular portion and the sealing portion are made of quartz glass or sapphire crystals, the fluorescent screen portion, the tubular portion and the sealing portion can be connected in a matched mode, the glass shell has the advantages of being good in shock resistance, good in explosion resistance and the like, the air tightness requirement of the cathode ray tube can be met, and the light emitting efficiency of a light source can be improved remarkably. The cathode ray tube has the advantages of high luminous efficiency, no pollution, low cost and easy mass production.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.

FIG. 1 is a schematic view of a cathode ray tube structure according to an embodiment of the present application;

FIG. 2 is a schematic view of a glass envelope structure according to an embodiment of the present application;

fig. 3 is a schematic view of a structure of a glass envelope according to another embodiment of the present application;

FIG. 4 is a schematic view of a glass envelope structure according to another embodiment of the present application;

FIG. 5 is a schematic view of a light emitting structure layer according to an embodiment of the present application;

fig. 6 is a graph of an emission spectrum of a phosphor layer under electron beam excitation according to an embodiment of the present disclosure;

fig. 7 is a schematic view of an electrical lead assembly according to an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of embodiments of the present application. It will be apparent, however, to one skilled in the art, that the embodiments of the present application may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the embodiments of the present application; that is, not all features of an actual embodiment are described herein, and well-known functions and structures are not described in detail.

In the drawings, the size of layers, regions, elements, and relative sizes may be exaggerated for clarity. Like reference numerals refer to like features throughout.

It will be understood that when a feature is referred to as being "on … …", "adjacent … …", or "connected to … …", it can be directly on, adjacent, or connected to other features, or intervening features may be present. In contrast, when a feature is referred to as being "directly on … …", "directly adjacent to … …", or "directly connected to … …", there are no intervening elements or layers present. Spatial relationship terms such as "on … …", "under … …", and the like, may be used herein for convenience of description to describe the relationship of one feature to another feature illustrated in the drawings. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, then features described as "below" or "beneath" or "under" other features would then be oriented "above" the other features.

It will be understood that although the terms first, second, third, etc. may be used to describe various features, these features should not be limited by these terms. These terms are only used to distinguish one feature from another. Thus, a first feature discussed below could be termed a second feature without departing from the teachings of the present invention. And the discussion of a second feature does not imply that the first feature is necessarily present in the invention. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features and/or steps, but do not preclude the presence or addition of one or more other features and/or steps. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

As shown in fig. 1, a cathode ray tube 10 according to an embodiment of the present invention includes a glass bulb 20, a light emitting structure layer 40, an electron gun 30, and an electrical lead assembly 50 electrically connected to the electron gun 30. Wherein the envelope 20 includes a tubular portion 22 for accommodating the electron gun and a fluorescent screen 21 connected to the tubular portion; an electron gun 30 disposed in the tubular portion 22 for emitting an electron beam toward the phosphor screen portion 21; a light emitting structure layer 40 is disposed on the phosphor screen portion 21, the light emitting structure layer 40 emitting ultraviolet light under excitation of electron beams; the electron gun 30 is electrically connected to the outside through an electric lead assembly 50;

for clarity of explanation of the technical solution of the present application, an axis "a" shown in fig. 1 to 4 is defined, and the axis "a" is a central axis of the phosphor screen portion 21. Wherein the direction of extension of the axis "a" is referred to as the longitudinal direction; it will be appreciated that the axis "A" extends perpendicular to the surface of the faceplate portion 21. The fluorescent screen portion 21 is connected to one end of the tubular portion 22; the faceplate portion 21 has an inner surface facing the tubular portion 22 and an outer surface remote from the tubular portion 22, both the inner and outer surfaces of the faceplate portion 21 being perpendicular to the axis "a".

Optionally, the phosphor screen portion 21 is formed of one or more inorganic light-transmitting materials having an ultraviolet light transmittance of 80% or more in a wavelength range of 190nm to 250 nm. Alternatively, the inorganic light-transmitting material may be one of quartz glass, sapphire, or magnesium fluoride crystal. Further, the inorganic light-transmitting material is quartz glass or sapphire crystal. Compared with common electronic glass, quartz glass or sapphire crystal has the advantages of no lead, high purity and the like, thereby reducing pollution, reducing the absorption of impurities to ultraviolet light and improving the light extraction efficiency of the ultraviolet light of the cathode ray tube.

Alternatively, the material of the tubular portion 22 and the material of the phosphor screen portion 21 are both quartz glass or sapphire crystal. Therefore, the connection of the glass bulb and the glass bulb is matched sealing, the problem of stress hardly exists in the sealing position, the sealing effect of the glass bulb is good, the sealing process can be scaled, and therefore, the cost is low, and the glass bulb has the advantages of good shock resistance, good explosion resistance and the like. It should be noted that, the matched sealing in the embodiment of the present application means that the thermal expansion coefficients of the two sealing materials are similar or the same, and the contraction of the two materials can be kept consistent in the process of gradual cooling after high-temperature sealing, so that the internal stress generated by the contraction difference can be eliminated.

As a possible implementation, the fluorescent screen portion 21 and the tubular portion 22 are formed separately, and then sealed under high-temperature melting and then cooled. Since the materials are the same, the softening temperature and thermal expansion coefficient of the fluorescent screen part 21 and the tubular part 22 are basically consistent, and the glass envelope 20 with stable performance is easily sealed and formed. As another possible implementation, the phosphor screen portion 21 and the tubular portion 22 are formed in a single-shot fusion molding process; specifically, the raw material is melted to a plastic state, and the melted raw material is molded and cooled according to the shape and size requirements of the envelope 20, thereby obtaining the envelope 20 including the fluorescent screen portion 21 and the tubular portion 22, which not only can improve the production efficiency of the envelope 20, but also can further reduce the internal stress because there is no sealing process. The glass envelope 20 has high shock resistance and stability.

Alternatively, the fluorescent screen portion 21 is disk-shaped, and the inner surface of the fluorescent screen portion 21 has a circular contour. Alternatively, the tubular portion 22 is in the shape of a circular tube, and the inner diameter of the tubular portion 22 is smaller than or equal to the diameter of the inner surface of the fluorescent screen portion 21. The rounded inner surface may receive more electron beam bombardment at the same area relative to the generally square or other shaped inner surface of the faceplate portion 21, thereby increasing the intensity of the ultraviolet light emitted. Furthermore, if the phosphor screen 21 and the tubular portion 22 are formed separately and then sealed, the side surface of the disk-shaped phosphor screen 21 is smooth during the sealing process between the phosphor screen 21 and the tubular portion 22, and the sealing at each position is easier to control uniformly, so that the stress caused by the non-uniform thickness of the sealing position can be reduced. Alternatively, the thickness of the phosphor screen portion 21 is between 0.5mm and 3 mm. Optionally, the tubular portion 22 has a wall thickness of between 0.5mm and 2 mm.

As shown in fig. 2 to 4, the envelope 20 includes a tubular portion 22 and a phosphor screen portion 21. Wherein the tubular portion 22 includes a first cylindrical portion 220, an inner surface of the first cylindrical portion 220 being perpendicular to an inner surface of the faceplate portion 21. Alternatively, the first barrel portion 220 and the faceplate portion 21 may or may not be directly connected (see fig. 2). In the case of not being directly connected, the tubular portion 22 may further include a tapered portion 221, and the first tube portion 220 is connected to the phosphor screen portion 21 through the tapered portion 221; further, the cone 221 is connected to the screen portion 21 through the second tube portion 202. Referring specifically to fig. 2-4, three alternative embodiments of the envelope 20 are shown.

As an alternative embodiment of the envelope 20, as shown in fig. 2, the tubular portion 22 includes a first cylindrical portion 220, and one end of the first cylindrical portion 220 is connected to the phosphor screen portion 21. Alternatively, the inner surface of the first cylindrical portion 220 is perpendicular to the inner surface of the fluorescent screen portion 21, i.e. the first cylindrical portion 220 and the fluorescent screen portion 21 form a closed-bottom cylinder. Therefore, on one hand, the solution amount above each area position of the inner surface of the fluorescent screen can be kept consistent in the fluorescent powder deposition process, so that the fluorescent powder is deposited on the inner surface of the fluorescent screen part 21 more uniformly, and on the other hand, the thickness of the side wall of the cylindrical part can be controlled more easily in the processing engineering, so that the consistency of the thickness is realized more easily, and the shock resistance and the explosion resistance are better.

As another alternative embodiment of the envelope 20, as shown in fig. 3, the tubular portion 22 includes a cone portion 221 and a first barrel portion 220. Wherein the cone portion 221 includes a small open end proximate the first canister portion 220 and a large open end distal the first canister portion 220; the large open end of the tapered portion 221 is connected to the screen portion 21, and the small open end of the tapered portion 221 is connected to the first tube portion 220. The electron gun 30 is disposed within the tubular portion 22, and in particular, the electron gun 30 is disposed within the first barrel portion 220. Alternatively, the ratio of the distance from the end surface of the small open end of the cone portion 221 to the inner surface of the screen portion 21 to the diameter of the inner surface of the screen portion 21 is in the range of 1:0.5 to 1:4, i.e., to facilitate control of the electron beam angle so that the electron beam is uniformly emitted to the entire inner surface of the screen portion 21.

As another alternative embodiment of the glass envelope 20, as shown in fig. 4, the tubular portion 22 includes a first cylindrical portion 220, a tapered portion 221, and a second cylindrical portion 222, and the second cylindrical portion 222 has an inner diameter larger than that of the first cylindrical portion 220. Wherein the cone portion 221 includes a small open end proximate to the first barrel portion 220 and a large open end distal from the first barrel portion 220; one end of the second tube 222 is connected to the large opening end of the tapered part 221, the other end of the second tube 222 is connected to the phosphor screen 21, and the small opening end of the tapered part 221 is connected to the first tube 220. The end surface of the small opening end of the tapered portion 221, the end surface of the large opening end of the tapered portion 221, and the inner surface of the screen portion 21 are parallel to each other. Alternatively, the inner surface of the second cylindrical portion 222 and the inner surface of the screen portion 21 are perpendicular to each other, i.e., the second cylindrical portion 222 and the screen portion 21 form a closed-bottom cylinder. The electron gun 30 is arranged within the tubular portion 22, in particular the electron gun 30 is arranged within the first barrel portion 220. By arranging the inner surface of the second cylinder 222 to be perpendicular to the inner surface of the fluorescent screen part 21, the amount of the solution right above the inner surface of the fluorescent screen part 21 is the same in the gravity precipitation method, and the fluorescent powder can be uniformly precipitated on the inner surface of the fluorescent screen under the action of gravity, so that the thickness of the fluorescent powder at each position of the inner surface of the fluorescent screen is more uniform, and the luminous effect is improved. Optionally, the height of the second cylinder portion 222 is greater than or equal to 20mm, so that the phosphor can be more uniformly distributed at the bottom of the glass envelope 20, and the uniformity of the phosphor layer is improved. It is to be understood that the height of the second canister portion 222 refers to the length of the second canister portion 222 in the direction of the axis "A". Optionally, the ratio of the distance from the end face of the small open end of the cone portion 221 to the inner surface of the screen portion 21 to the diameter of the inner surface of the screen portion 21 is 1:0.5-1:4, so as to control the electron beam angle to uniformly emit the electron beams to the entire inner surface of the screen portion 21, otherwise the electron beam angle is too small or too large to uniformly emit the electron beams to the entire inner surface of the screen portion 21. Optionally, the ratio of the distance from the end surface of the small opening end of the cone 221 to the end surface of the large opening end of the cone 221 to the height of the second cylindrical part 222 is between 0.5:1 and 2:1, so that the electron beams can be controlled to be emitted to the inner surface of the phosphor screen part 21 completely, and the electron beams are prevented from being blocked by the inner surface of the cone 221. .

It can be understood that, in this embodiment, the taper portion 221 is not limited to the case that the side wall between the small opening end and the large opening end is extended in a straight line with a constant slope as shown in fig. 3 or fig. 4, the taper portion 221 may also include a side wall with a variable slope, and may even include multiple sub-taper portions, and each sub-taper portion may also be connected by another tube portion, which is not described herein again.

It will be appreciated that the taper 221 has a progressively larger or smaller cross-sectional dimension in a direction perpendicular to the axis "a"; the cross-sectional dimension of the barrel portion in a direction perpendicular to the axis "a" is constant.

Alternatively, as shown in fig. 2 to 4, the envelope 20 further includes a closing portion 23, and the closing portion 23 is connected to an end of the tubular portion 22 remote from the phosphor screen portion 21. The closing portion 23 is configured to effect port sealing of an end of the tubular portion 22 remote from the faceplate portion 21. The envelope 20 is enclosed by the fluorescent screen portion 21, the tubular portion 22 and the closing portion 23 to form a closed internal space, the internal space of the envelope 20 is in a vacuum state, and specifically, the pressure of the internal space of the envelope 20 is 10 ^-2 ～10 ^-7 Pa, so that the influence of the residual air in the inner space on the electron beam and the cathode can be reduced. Optionally, the thickness of the closing portion 23 is greater than the thickness of the tube wall of the tubular portion 22 and less than the inner diameter of the tubular portion 22. Optionally, the material of the closing portion 23 is quartz glass or sapphire crystal. Existing ultraviolet lightBoth mercury source lamps and excimer UV lamps belong to the class of gas discharge lamps, which have an internal gas pressure of 5-10 times the external gas pressure, which in the present example is 10 times the internal pressure of the envelope ⁷ -10 ¹² Doubling; therefore, compared with a gas discharge lamp, the sealing requirement and the air tightness requirement of the glass bulb are much higher, and the fluorescent screen part material, the closing part material and the tubular part material are all quartz glass or sapphire crystals, so that matched sealing can be formed better, and the air tightness requirement of the glass bulb is met. Alternatively, the closing portion 23 may be formed, for example, by deforming one end of the tubular portion 22, specifically, by pressing the open end of the tubular portion 22 in a high-temperature heating and melting state and then cooling; wherein the largest cross section of the formed seal is parallel to the axis "A". In a particular application, the closure portion 23 is flat, the length of the flat closure portion being greater than 15mm, the length of the closure portion being in the direction of the axis "a". It will be understood that a flat closure portion 23 means in particular that the length and width of the closure portion 23 are significantly greater than the thickness of the closure portion 23, for example that the length of the closure portion 23 is greater than 15mm, the width is greater than 10mm and the thickness is less than 4 mm. In the process of deforming one end of the tubular portion 22 into the closed portion 23, a transition portion 24 is also formed between the tubular portion 22 and the closed portion 23; one end of the transition part 24 is connected with the tubular part 22, and the other end is connected with the closed part 23; the transition portion 24 is specifically a portion of the tubular portion 22, which is gradually closed but not completely closed after one end of the tubular portion is subjected to press deformation. Compared with the traditional sealing mode, the sealing part 23 provided by the embodiment of the application has better sealing effect, on one hand, the materials of the sealing part and the tubular part are quartz glass or sapphire crystals, so that matched sealing can be formed, the packaging effect is good, and the requirement of the glass bulb on air tightness is met; on the other hand, the sealing part directly formed by the deformation of the opening end of the tubular part can form smooth connection in the high-temperature heating sealing process, the sealing is convenient and simple, and the better connection effect is achieved.

Alternatively, as shown in fig. 2 to 4, the envelope 20 further includes a venting portion 25. Specifically, the tubular portion 22 is provided with an exhaust portion 25, and one end of the exhaust portion 25 is connected to the inside of the tube and the other end is sealed. Alternatively, the material of the air discharging part 25 is the same as that of the tubular part 22. In specific application, the side wall of the tubular part 22 is locally heated to a molten state at high temperature, then one end of the exhaust pipe with openings at two ends is inserted into the side wall heated to the molten state at high temperature, and the exhaust pipe is fixed on the tubular part 22 after cooling; when the exhaust operation is needed, the opening at the other end of the exhaust pipe is connected with the air extraction equipment and the air extraction operation is carried out, when the vacuum degree in the pipe reaches a preset value, the other end of the exhaust pipe is heated to be in a molten state and then is pressed and sealed, and the exhaust part is formed after the temperature is reduced. Alternatively, the exhaust part 25 is provided on the tubular part 22 on the side close to the electron gun 30, i.e., the distance between the exhaust part 25 and the electron gun 30 is smaller than the distance between the exhaust part 25 and the fluorescent part. Specifically, in the embodiment where the tubular portion 22 includes the tapered portion 221, the air release portion 25 is provided on the first tube portion 220, and the inner and outer surfaces of the first tube portion 220 are free from other coatings, which makes it more convenient to provide the air release portion.

Optionally, the cathode ray tube 10 further includes an anode metal rod (not shown). The anode metal rod penetrates through the tubular part 22, and specifically, one end of the anode metal rod is arranged in the tubular part 22 and connected with the conductive layer on the inner wall of the tubular part 22, and the other end of the anode metal rod is arranged on the tubular part 22 and connected with external high voltage, so that the inner wall of the tubular part 22 forms a high voltage electric field. Alternatively, the anode metal rod is fused to the tubular portion 22 at a central portion thereof. Specifically, the surface of the anode metal rod is plated with a layer of transition metal film, wherein the thermal expansion coefficient of the transition metal film is between that of the glass bulb 20 and the anode metal rod; the anode metal rod is a tungsten rod, and the transition metal film can be a nickel film. The problem of internal stress caused by mismatching of thermal expansion coefficients is reduced through the transition metal film, and the sealing effect is improved. Alternatively, the anode metal rod is provided on the tubular portion 22 on the side close to the phosphor screen portion 21.

Fig. 5 is a schematic view of a light emitting structure layer according to an embodiment of the present disclosure, wherein the light emitting structure layer 40 includes a phosphor layer 41 and a conductive layer 42; a phosphor layer 41 is provided on the phosphor screen portion 21, and a conductive layer 42 is provided on the phosphor layer 41. The electron gun is used for emitting electron beams to the phosphor screen portion, and particularly for emitting all or most of the electron beams onto the phosphor layer 41, and the phosphor layer 41 emits ultraviolet light under excitation of the electron beams.

In a particular application, the phosphor layer 41 is disposed on an inner surface of the phosphor screen portion 21. Here, the inner surface refers to a surface of the phosphor screen 21 on a side close to the electron gun 30. Optionally, the phosphor layer 41 is between 5-50 μm thick. Here, the phosphor layer 41 thickness is a distance between the inner surface of the phosphor screen portion 21 and the surface of the phosphor layer 41, where the surface of the phosphor layer 41 refers to the surface of the phosphor layer 41 on the side facing the electron gun 30.

Optionally, the wavelength of the main emission peak of the ultraviolet light emitted by the phosphor layer 41 under the excitation of the electron beam is between 190nm and 250 nm. It should be noted that the main emission peak in the embodiments of the present application refers to an emission peak having the maximum emission intensity under the excitation of electron beams; it will be readily appreciated that if the emitted ultraviolet light also includes other emission peaks, the luminous intensity of any other emission peak is less than the luminous intensity of the main emission peak. It should be noted that the wavelengths of different emission peaks are separated by at least 5 nm; different emission peaks are considered to be one and the same emission peak if their wavelengths are within 5nm of each other. The shorter the wavelength of the ultraviolet light, the stronger the energy, and the weaker the penetration force, for example, in the field of sterilization and disinfection, the shorter the wavelength of the ultraviolet light, the higher the energy, not only can destroy the DNA of virus or bacterial cells, but also the penetration force is weak so as to reduce the damage to human skin, therefore, the shorter the wavelength of the ultraviolet light, the wider the application prospect is. The cathode ray tube in the embodiment of the application emits ultraviolet light in a mode of exciting the fluorescent powder layer by using the electron beam, the wavelength of a main emission peak of the emitted ultraviolet light is between 190nm and 250nm, and compared with a 254nm mercury lamp and an ultraviolet LED lamp, the cathode ray tube in the embodiment of the application emits ultraviolet light with smaller wavelength, stronger energy, adjustable luminous intensity and adjustable luminous frequency, and has wider application prospect in the fields of sterilization, ultraviolet communication and ultraviolet curing lamps.

Optionally, the ultraviolet light emitted by the phosphor layer 41 under the excitation of the electron beam has a cumulative emission intensity between 190nm and 250nm which is greater than a cumulative emission intensity between 250nm and 300 nm. Cumulative emission intensity refers to the sum of the cumulative intensities over a range of wavelengths, and is formulated as G ═ f (x) dx, where G denotes the cumulative emission intensity, x denotes the wavelength, and f (x) denotes the emission intensity at wavelength x.

As shown in fig. 5, the phosphor layer 41 in the embodiment of the present application may include a phosphor 410, and the phosphor layer 41 emits ultraviolet light under excitation of an electron beam, specifically, the phosphor 410 emits ultraviolet light under excitation of an electron beam.

Optionally, the phosphor 410 includes a host material and a dopant element, wherein the dopant element is doped into the host material to form an impurity defect to cause light emission. The doping element contains Nd, Pr or Bi, and the Nd, Pr or Bi can emit ultraviolet light less than 250nm after absorbing the energy of the electron beam, and has the advantages of high luminous efficiency, short luminous wavelength and the like. Optionally, the substrate material is rare earth phosphate, the rare earth phosphate has the advantages of low phonon energy, stable property and the like, and the rare earth phosphate can resist electron beam bombardment and can remarkably improve the luminous intensity and the service life of the fluorescent powder layer.

As an alternative embodiment, the phosphor contains a doping element, the doping element contains at least one selected from Nd, Pr, and Bi, and the doping element emits ultraviolet light after being excited by an electron beam. Optionally, Nd, Pr, Bi have mainly stable trivalent electron configuration as doping elements. Further, the phosphor may include at least one of: RePO ₄ :Z ₁ 、LaP ₅ O ₁₄ :Z ₁ 、CaSO ₄ :Z ₁ 、SrSO ₄ :Z ₁ 、NaYF ₄ :Z ₁ 、LiYF ₄ :Z ₁ 、KYF ₄ :Z ₁ 、LiLaP ₄ O ₁₂ :Z ₁ 、Y ₂ (SO ₄ ) ₃ :Z ₁ 、YAlO ₃ :Z ₁ 、YF ₃ :Z ₁ (ii) a Wherein Re represents one or more selected from Y, La, Lu, Sr, Gd, Sm and Ce, and Z ₁ Represents a doping element containing one element selected from Nd, Pr and Bi. Optionally, the molar ratio of doping element to doped element in the host material is less than 5: 95. As shown in FIG. 6, it contains YPO ₄ The phosphor layer of Nd phosphor (doping concentration of Nd is 1%, i.e. molar ratio of Y to Nd is 99:1) emits ultraviolet light with a main emission peak wavelength of195nm, a first emission peak wavelength of 277nm, and a second emission peak wavelength of 240 nm; the integrated area of the intensity of the luminous spectrum curve between the wavelength 190nm and the wavelength 250nm is 14.3, the integrated area of the intensity of the luminous spectrum curve between the wavelength 250nm and the wavelength 300nm is 8.9, and the cumulative emission intensity of the emitted ultraviolet light in the wavelength range between the wavelength 190nm and the wavelength 250nm is larger than the cumulative emission intensity of the ultraviolet light in the wavelength range between the wavelength 250nm and the wavelength 300 nm. Table 1 shows the main emission peak wavelength in the emission spectrum of cathode ray of the phosphor in the example of the present application, in which the concentration of the phosphor doping element is 1% and the electron beam acceleration voltage is 10 kV. It is understood that the wavelength of the main emission peak in the cathodoluminescence spectrum of the phosphor is influenced by the particle size of the phosphor, the doping concentration and the electron beam acceleration voltage, and the wavelength of the main emission peak may be different under different conditions; meanwhile, the fluorescent powder in the embodiment of the application is the luminescent fluorescent powder excited by the electron beam, which is completely different from the luminescent fluorescent powder; even with the same phosphor, the spectral curves under electron beam excitation and under illumination excitation are not exactly the same.

Serial number	Fluorescent powder	Main emission peak wavelength (nm)
			1	LiYF ₄ :Pr	218
2	KYF ₄ :Pr	235
			3	YPO ₄ :Pr	232
4	LaPO ₄ :Pr	225
			5	YAlO ₃ :Pr	245
6	YPO ₄ :Bi	241
			7	YPO ₄ :Nd	195
8	LuPO ₄ :Pr	235
			9	LaPO ₄ :Bi	234
10	LaPO ₄ :Nd	192

TABLE 1

As another optional embodiment, the phosphor contains a doping element, and at least two doping elements selected from Nd, Pr, and Bi emit ultraviolet light after being excited by electron beams; in the doping elementNd, Pr and Bi mainly have stable trivalent electron configuration, and can form energy transfer among Nd, Pr and Bi under the excitation of electron beams so as to improve the luminous intensity of ultraviolet light. Further, the phosphor may include at least one of: RePO ₄ :Z ₂ 、LaP ₅ O ₁₄ :Z ₂ 、CaSO ₄ :Z ₂ 、SrSO ₄ :Z ₂ 、NaYF ₄ :Z ₂ 、LiYF ₄ :Z ₂ 、KYF ₄ :Z ₂ 、LiLaP ₄ O ₁₂ :Z ₂ 、Y ₂ (SO ₄ ) ₃ :Z ₂ 、YAlO ₃ :Z ₂ 、YF ₃ :Z ₂ (ii) a Wherein Re represents one or more of Y, La, Lu, Sr, Gd, Sm and Ce, and Z ₂ Represents a doping element containing two elements selected from Nd, Pr and Bi. Optionally, the molar ratio of the doping element to the doped element is less than 5: 95. As shown in FIG. 7, YPO was contained in each phosphor layer of the same thickness ₄ Nd (Nd doping concentration of 1%), YPO ₄ Bi (Bi doping concentration of 1%) and YPO ₄ Luminescence spectrogram of phosphor layer of Nd, Bi (Nd doping concentration is 1%, Bi doping concentration is 1%) phosphor powder under electron beam excitation, wherein YPO is contained ₄ The wavelength of a main emission peak of a phosphor layer of Nd phosphor is 195nm, the wavelength of a first emission peak is 277nm, and the wavelength of a second emission peak is 240 nm; containing YPO ₄ The wavelength of the main emission peak of the fluorescent powder layer of the Bi fluorescent powder is 241 nm; containing YPO ₄ The primary emission peak wavelength of the phosphor layer of Nd, Bi phosphor is 241nm, the first emission peak wavelength is 195nm, and the secondary emission peak wavelength is 277 nm. As can be seen from the figure, the YPO is contained ₄ The luminescent intensity of the phosphor layer of Nd, Bi phosphor powder at 195nm and 277nm is less than YPO ₄ Nd emission intensity and 241nm emission intensity greater than YPO ₄ The luminous intensity of Bi; this is because the YPO is contained ₄ In the fluorescent powder layer of Nd, Bi fluorescent powder, energy transfer is formed between the doping element Nd and the doping element Bi, namely, a part of electron energy absorbed by Nd is transferred to Bi, thereby not only improving the luminous intensity of the Bi element at 241nm, but also improving the whole fluorescent powder layer within the range of less than 300nmUltraviolet emission intensity of the body. It is also apparent from the figure that the cumulative emission intensity of the ultraviolet light emitted by the three phosphor layers in the wavelength range of 190nm to 250nm is greater than the cumulative emission intensity of the ultraviolet light emitted by the three phosphor layers in the wavelength range of 250nm to 300 nm.

Referring to fig. 7, which is a schematic view of an electrical lead assembly according to an embodiment of the present invention, the electrical lead assembly 50 is inserted through the sealing portion 23 such that one end of the electrical lead assembly 50 is exposed from the sealing portion 23, and the other end is connected to the electron gun 30 in the tubular portion 22, and the electron gun 30 is connected to an external circuit through the electrical lead assembly 50. Optionally, the electrical lead assembly 50 includes a plurality of electrical leads 500, and the electron gun 30 is electrically connected to an external circuit through the electrical leads 500. Specifically, the different electric leads are connected with external independent input voltages respectively, so that the voltages of all parts of the electron gun can be controlled independently.

Optionally, the electrical lead assembly 50 includes at least four electrical leads.

Optionally, at least one electrical lead is electrically connected to the electron beam acceleration zone metal cylinder. Through being connected with electric lead and electron acceleration district metal cylinder electricity to external circuit can directly provide the high voltage potential of 5kV-20kV for electron acceleration district through electric lead, connects more conveniently simply, thereby can avoid additionally setting up the positive pole metal pole that is used for high voltage potential to connect again on glass bulb 20.

Optionally, the electrical lead 500 includes an upper end wire 501, a middle metal sheet 502 and a lower end wire 503, wherein the middle metal sheet 502 is connected to the upper end wire 501 and the lower end wire 503 respectively; the intermediate metal sheet 502 is enclosed in the closing portion 23; a part of the upper end wire 501 is enclosed in the enclosing part 23, and the other part extends out of the enclosing part 23 for connecting with an external circuit; the lower end wire 503 is partially enclosed in the closing part 23, and is partially connected to the cathode assembly 31 and/or the electrode assembly 32. For the case where the electrical lead assembly 50 includes a plurality of electrical leads 500, each electrical lead 500 in the plurality of electrical leads 500 may have the same structure; each electrical lead 500 may include an upper end wire 501, a middle metal sheet 502, and a lower end wire 503; of course, the present embodiment does not exclude the case where the plurality of electrical leads 500 have different structures. The sealing condition of the sealing part 23 can directly affect the air tightness in the glass shell, the difference between the thermal expansion coefficient of the electric lead and the thermal expansion coefficient of the glass shell is large, and the metal sheet can be better sealed in the sealing part through the metal sheet with small thickness and the flat sealing part, so that good sealing performance is kept.

Optionally, the edges of the middle metal sheet 502 along the axis "a" are knife-edged. In the process of forming the closing portion 23, a stretching force is generated, and the blade-shaped edge of the intermediate metal sheet 502 in the stretching direction of the closing portion 23 can generate fine plastic deformation along with the stretching force, so that the intermediate metal sheet 502 can be better closed by the closing portion 23, and good sealing performance is formed. It should be noted that the blade-like shape in the embodiment of the present application is embodied in that the thickness of the intermediate metal sheet is gradually reduced at the edge, for example, the thickness of the intermediate metal sheet is 0.6mm at the position close to the edge, the thickness of the outermost position is 0.1mm, and the thickness is gradually reduced from the position close to the edge to the outermost edge.

Optionally, the electrical lead assembly 50 further includes a fixing post 51, the lower end wire 503 is connected to the middle metal sheet 502 after penetrating through the fixing post 51, and the fixing post 51 is used for fixing the electrical lead, preventing the electrical lead from bending and deforming, and avoiding mutual contact among a plurality of electrical leads. Optionally, the fixing column 51 is made of quartz glass, and the quartz glass is more heat-insulating and high-temperature-resistant, so that the influence of high-temperature heating is avoided.

Optionally, the electrical lead assembly 50 further includes a connecting tab 55, and the lower end wire 503 is electrically connected to the electron gun 30 through the connecting tab 55. Specifically, the lower end wire 503 is connected to the connecting piece 55 by welding, and the connecting piece 55 is connected to the electron gun 30 by the wire 57. Alternatively, the connecting piece 55 is L-shaped, so that a smaller space can be occupied, and connection is more convenient. Optionally, the electrical lead 500 material is molybdenum. Optionally, the connecting piece 55 is made of stainless steel, and the metal wire 57 is made of stainless steel. Optionally, the electrical lead assembly 50 further includes a buffer metal sheet 56. Specifically, the lower end wire 503 is connected to the connection piece 55 through a buffer metal sheet 56, the buffer metal sheet 56 is welded to the connection piece 55, the lower end wire 503 is welded to the buffer metal sheet 56, and the connection piece 55 is connected to the electrode assembly 32 or the cathode assembly 31 through a wire 57. Optionally, the buffer metal sheet 56 is made of nickel. Through the buffer metal and the connecting sheet, the condition of poor connection caused by different thermal expansion coefficients of materials can be reduced, and the connection stability is improved.

Optionally, the cross-sectional diameters of the upper end wire 501 and the lower end wire 503 are both larger than the center thickness of the middle metal sheet 502.

Optionally, the cross-sectional diameters of the upper end wire 501 and the lower end wire 503 are both between 0.5mm and 0.8 mm.

Optionally, the center thickness of the middle metal sheet 502 is between 0.1mm and 0.4 mm. Optionally, the middle metal sheet 502 is a rectangular metal sheet, and a long side of the rectangular metal sheet extends along the "a" axis direction, and the length of the long side is greater than or equal to 10 mm. It should be understood that the thickness of the intermediate metal sheet in the embodiments of the present application is substantially the same at other locations than the knife-edge locations. The center thickness of the middle metal sheet 502 refers to the thickness of the middle metal sheet 502 except for the location of the knife-edge.

The cathode ray tube provided by the embodiment of the application comprises a glass shell, a light-emitting structure layer, an electron gun and an electric lead assembly electrically connected with the electron gun, wherein ultraviolet light is emitted in a mode that the electron gun emits electron beams to excite the light-emitting structure layer. The fluorescent screen portion, the tubular portion and the sealing portion are made of quartz glass or sapphire crystals, the fluorescent screen portion, the tubular portion and the sealing portion can be connected in a matched mode, the glass shell has the advantages of being good in shock resistance, good in explosion resistance and the like, the air tightness requirement of the cathode ray tube can be met, and the light emitting efficiency of a light source can be improved remarkably. The cathode ray tube has high luminous efficiency, no pollution, low cost and easy mass production.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the embodiments of the present application and are not intended to limit the scope of the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application. The technical features in the above embodiments may be arbitrarily combined without conflict.

Claims

1. A cathode ray tube, comprising: the device comprises a glass shell, a light emitting structure layer, an electron gun and an electric lead assembly electrically connected with the electron gun;

the glass envelope includes a tubular portion for accommodating the electron gun and a phosphor screen portion connected to the tubular portion;

the glass envelope is enclosed into a sealed inner space through the fluorescent screen part, the tubular part and the sealing part, and the inner space of the glass envelope is in a vacuum state.

2. The cathode ray tube of claim 1, wherein the closed portion is formed by deforming an end of the tubular portion.

3. The cathode ray tube of claim 1 or 2, wherein the thickness of the enclosing section is greater than the thickness of the tube wall of the tubular section and less than the inner diameter of the tubular section.

4. The cathode ray tube of claim 1 or 2, wherein the electrical lead assembly comprises a plurality of electrical leads;

the electric lead comprises an upper end metal wire, a middle metal sheet and a lower end metal wire, wherein two ends of the middle metal sheet are respectively connected with the upper end metal wire and the lower end metal wire;

the intermediate metal sheet is enclosed within the enclosure.

5. The cathode-ray tube of claim 4, wherein the edge of the intermediate metal sheet in the axial direction is knife-edged.

6. The cathode ray tube of claim 4, wherein the upper end wire and the lower end wire each have a cross-sectional diameter of between 0.5mm and 0.8mm, and the middle plate has a center thickness of between 0.1mm and 0.4 mm.

7. The cathode ray tube of claim 4, wherein the electrical lead assembly further comprises a fixing post through which the lower wire of each of the plurality of electrical leads extends.

8. The cathode ray tube of claim 1, wherein the inner surface of the phosphor screen portion is circular in contour.

9. The cathode ray tube of claim 1, wherein the tubular portion comprises a first skirt portion;

the inner surface of the first tube part is perpendicular to the inner surface of the fluorescent screen part.

10. The cathode ray tube of claim 9, wherein the first skirt portion is connected to the faceplate portion.