JP2005093324A - Glass substrate used for image display device, manufacturing method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass substrate used for an image display device which can be manufactured inexpensively and has mechanical strength improved, and to provide a method and a device for manufacturing the glass substrate. <P>SOLUTION: A pair of rollers 54a, 54b in at least one of which a plurality of ribs are set in protrusion on a periphery surface are prepared and disposed facingly at a prescribed interval. While the pair of rollers 54a, 54b are rotated, a glass substrate 80 with a thickness corresponding to the prescribed interval is formed, by having a softened glass material pass between the rollers 54a, 54b and also grooves 40 are formed by ribs on at least one surface of the glass substrate 80. In the formed glass substrate 80, parts with the grooves 40 formed thereon and the other parts have equal light transmittance in the thickness direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a glass substrate, a glass substrate manufacturing method, and a glass substrate manufacturing apparatus that are used in a flat-type image display device including substrates that are arranged to face each other.

  2. Description of the Related Art In recent years, various flat-type image display devices have attracted attention as next-generation lightweight and thin display devices that replace cathode ray tubes (hereinafter referred to as CRTs). For example, a surface conduction electron-emitting device (hereinafter referred to as SED) is being developed as a type of field emission display (hereinafter referred to as FED) that functions as a flat display device.

  The SED includes a first substrate and a second substrate that are each composed of a glass substrate and are opposed to each other with a gap therebetween, and these substrates are surrounded by a vacuum by joining peripheral portions to each other through rectangular side walls. Make up the vessel. Three color phosphor layers are formed on the inner surface of the first substrate, and on the inner surface of the second substrate, a large number of electron-emitting devices corresponding to each pixel are arranged as an electron source for exciting the phosphor. In addition, a large number of wirings for driving the electron source are formed in a matrix on the inner surface of the second substrate. That is, these wirings include a plurality of first wirings extending in parallel to each other and a plurality of second wirings extending in a direction orthogonal to the first wirings, and the first and second wirings are electrically connected to each other. Insulated. Each electron source is electrically connected to the drive circuit via the first wiring and the second wiring.

  Such first and second wirings are constituted by, for example, a silver thin film pattern formed on a glass substrate by a screen printing method or a photolithography method. When such a screen printing method or photolithography method is used, there is a limit to the film thickness of the thin film pattern that can be formed. When the film thickness is small, the cross-sectional area of the wiring becomes small, and it becomes difficult to reduce the electrical resistance of the wiring. In particular, the larger the image display device becomes and the longer each wiring, the greater the influence of wiring resistance. When the wiring resistance increases, there arises a problem that the luminance at the center of the screen is reduced due to the voltage drop.

In order to solve such a problem, a method has been proposed in which a plurality of elongated grooves are formed in a glass substrate by cutting, sandblasting or etching, and a conductive material is filled in these grooves to form a wiring (for example, Patent Document 1). According to this method, by adjusting the depth of the groove, it is possible to form a wiring with a sufficient film thickness and to reduce the wiring resistance.
JP 2002-203475 A

  However, when forming a groove in a glass substrate by cutting, sandblasting, or etching, a large-scale manufacturing facility is required, and a cleaning process is required after the formation of the groove. Therefore, it takes a lot of manufacturing time and manufacturing cost, and it is difficult to put it to practical use industrially. Moreover, when a groove is formed later on the glass substrate once formed into a plate shape using the above method, there is a problem that the strength of the glass substrate is lowered and the glass substrate is easily broken.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a glass substrate for an image display device that can be manufactured at a low cost and has improved mechanical strength, a manufacturing method thereof, and a manufacturing apparatus for a glass substrate. It is to provide.

  In order to achieve the above object, a glass substrate of an image display device according to an aspect of the present invention has a plurality of grooves integrally formed on at least one surface, and a portion where the grooves are formed and another portion. The light transmittance in the plate thickness direction is equal.

  A method for manufacturing a glass substrate according to another aspect of the present invention provides a pair of rollers having a plurality of ribs projecting from the outer peripheral surface of at least one roller, and the pair of rollers are arranged to face each other at a predetermined interval. Then, while rotating the pair of rollers, the softened glass material is passed between the pair of rollers to form a glass substrate having a thickness corresponding to the predetermined interval, and at the same time, at least one of the glass substrates by the ribs It is characterized by forming grooves on the surface.

  Moreover, the manufacturing apparatus of the glass substrate which concerns on the other aspect of this invention WHEREIN: The 1st and 2nd roller and the 2nd roller which were opposingly arranged in parallel at predetermined intervals, and the softened glass material are used between the said 1st and 2nd rollers. The first and second rollers are spaced apart from each other by a predetermined distance, and the glass material is predetermined when the softened glass material passes between the first and second rollers. Each of the first and second rollers is provided on the outer peripheral surface, and when the glass material softened between the first and second rollers passes, It is characterized by having a plurality of ribs that press the softened glass material to form grooves on the surface of the glass substrate.

  According to the glass substrate manufacturing method and manufacturing apparatus configured as described above, when a soft glass material is formed into a plate shape, a plurality of grooves are simultaneously formed by a roller provided with ribs. It is possible to produce a glass substrate provided with the above-mentioned grooves at low cost and obtain a glass substrate with improved mechanical strength.

Hereinafter, a glass substrate, a glass substrate manufacturing method and a manufacturing apparatus according to embodiments of the present invention will be described in detail with reference to the drawings.
First, a surface conduction electron-emitting device (hereinafter referred to as SED), which is a kind of FED, will be described as an example of a flat image display device including a glass substrate according to the present embodiment.

  As shown in FIGS. 1 to 3, the SED includes a first substrate 10 and a second substrate 12 each made of a rectangular glass substrate, and these substrates have a gap of about 1.0 to 2.0 mm. Opposed. The 1st board | substrate 10 and the 2nd board | substrate 12 comprise the flat vacuum envelope 15 by which the peripheral parts were joined through the rectangular-frame-shaped side wall 14 which consists of glass, and the inside was maintained at the vacuum. The side wall 14 functioning as a bonding member is sealed to the peripheral edge of the first substrate 10 and the peripheral edge of the second substrate 12 by, for example, a sealing material 20 such as low-melting glass or low-melting metal. Are joined.

  A phosphor screen 16 that functions as an image display surface is formed on the inner surface of the first substrate 10. The phosphor screen 16 is configured by arranging phosphor layers R, G, and B that emit red, blue, and green, and a light shielding layer 11, and these phosphor layers are formed in a stripe shape, a dot shape, or a rectangular shape. Has been. On the phosphor screen 16, a metal back 17 and a getter film 19 made of aluminum or the like are sequentially formed.

  On the inner surface of the second substrate 12, a number of surface conduction electron-emitting elements 18 that emit electron beams are provided as electron sources for exciting the phosphor layers R, G, and B of the phosphor screen 16. . These electron-emitting devices 18 are arranged in a plurality of columns and a plurality of rows corresponding to each pixel. Each electron-emitting device 18 includes an electron emitting portion (not shown) and a pair of device electrodes for applying a voltage to the electron emitting portion. As will be described later, on the inner surface of the second substrate 12, a large number of wirings for supplying a potential to the electron-emitting devices 18 are provided in a matrix shape, and the end portions are drawn out of the vacuum envelope 15. .

  A spacer structure 22 is disposed between the first substrate 10 and the second substrate 12. The spacer structure 22 includes a grid 24 made of a rectangular metal plate, and a large number of columnar spacers standing integrally on both sides of the grid. 2 and 3, the grid 24 has a first surface 24a facing the inner surface of the first substrate 10 and a second surface 24b facing the inner surface of the second substrate 12, and is parallel to these substrates. Has been placed. A large number of electron beam passage holes 26 are formed in the grid 24 by etching or the like. The electron beam passage apertures 26 are respectively arranged to face the electron emission elements 18 and transmit the electron beams emitted from the electron emission elements. The grid 24 is formed with a thickness of 0.1 to 0.3 mm by, for example, an iron-nickel metal plate, and the surface thereof is covered with a high resistance film.

  On the first surface 24 a of the grid 24, a first spacer 30 a is integrally provided and is positioned between adjacent electron beam passage holes 26. The tip of the first spacer 30 a is in contact with the inner surface of the first substrate 10 through the getter film 19, the metal back 17, and the light shielding layer 11 of the phosphor screen 16. On the second surface 24 b of the grid 24, a second spacer 30 b is integrally provided so as to be positioned between adjacent electron beam passage holes 26. The tip of the second spacer 30 b is in contact with the inner surface of the second substrate 12. The first and second spacers 30a and 30b are aligned with each other, and are formed integrally with the grid 24 with the grid 24 sandwiched from both sides.

  The spacer structure 22 configured as described above is disposed between the first substrate 10 and the second substrate 12. The first and second spacers 30a and 30b are in contact with the inner surfaces of the first substrate 10 and the second substrate 12, thereby supporting the atmospheric pressure load acting on these substrates and maintaining the distance between the substrates at a predetermined value. doing.

  As described above, a large number of wirings for applying a voltage to the electron-emitting devices 18 are provided on the second substrate 12 in a matrix. That is, as shown in FIGS. 2 to 4, a plurality of grooves 40 extending along the longitudinal direction of the substrate are formed at a predetermined pitch on the inner surface of the glass substrate constituting the second substrate 12. A scanning line 42 is provided in each groove 40. Each scanning line 42 is formed by filling the groove 40 with a conductive material, for example, silver paste, and then baking it. An insulating layer 44 is formed on the inner surface of the second substrate 12 so as to overlap the scanning line 42, and a plurality of signal lines 46 are formed on the insulating layer. These signal lines 46 extend in a direction perpendicular to the scanning lines 42 and are arranged at a predetermined pitch. 480 scanning lines 42 and 640 × 3 signal lines 46 are provided, and the wiring pitches are 900 μm and 300 μm, respectively.

  In the display region 47 indicated by a two-dot chain line in FIG. 4, the electron-emitting device 18 is connected to each intersection of the scanning line 42 and the signal line 46 to form a pixel. The number of electron-emitting devices 18 is 640 × 3 along each scanning line 42 and 480 along each signal line 46.

  The right end of each scanning line 42 is connected to the scanning line driving circuit 48, and the upper end of each signal line 46 is connected to the signal line driving circuit 50. The scanning line driving circuit 48 supplies a driving voltage for driving and controlling the electron-emitting device 18 to the scanning line 42, and the signal line driving circuit 50 supplies a display signal voltage to the signal line 46.

  The SED includes a voltage supply unit (not shown) that applies a voltage to the grid 24 and the metal back 17 of the first substrate 10. The voltage supply unit is connected to the grid 24 and the metal back 17, and applies a voltage of 12 kV to the grid 24 and 10 kV to the metal back 17, for example. When an image is displayed in the SED, an anode voltage is applied to the phosphor screen 16 and the metal back 17, and the electron beam emitted from the electron emitter 18 is accelerated by the anode voltage to collide with the phosphor screen 16. . As a result, the phosphor layer of the phosphor screen 16 is excited to emit light and display an image.

Next, a manufacturing method and a manufacturing apparatus of a glass substrate used as the second substrate of the SED configured as described above will be described.
As shown in FIG. 5 and FIG. 6, the manufacturing apparatus 52 includes a first and second molding rollers 54 a and 54 b, a driving mechanism 55 that rotates these molding rollers, and a glass material that passes between the first and second molding rollers. And a transport mechanism 56 for transporting

  For example, the first molding roller 54a is formed to have a diameter of about 300 mm, and its axial length is longer than the width of the glass substrate to be formed. The first molding roller 54 a is supported horizontally and rotatably by a pair of support frames 60. A plurality of ribs 64 project integrally from the outer peripheral surface 62 of the first molding roller 54a. Each of the plurality of ribs 64 is formed in an annular shape coaxial with the central axis of the first molding roller 54a, and extends over the entire circumference in the circumferential direction of the first molding roller. The plurality of ribs 64 are provided at a predetermined pitch along the axial direction of the first molding roller 54a.

  The number and the pitch of the ribs 64 are set corresponding to the number and pitch of the grooves 40 formed in the glass substrate. Moreover, the height and width of each rib 64 are formed according to the depth and width of the groove 40 to be formed. For example, the height of the rib 64 is formed to be 200 to 300 μm. In FIG. 5, the number of ribs 64 and grooves 40 is shown to be smaller than the actual number in order to avoid complication of the drawing.

  The second molding roller 54b is formed to have substantially the same diameter and axial length as the first molding roller 54a. The second molding roller 54b is horizontally and rotatably supported by a pair of support frames 60. The second molding roller 54b is disposed in parallel with the first molding roller 54a and facing the vertical direction with a predetermined interval. The distance d between the outer peripheral surface 62 of the first molding roller 54a and the outer peripheral surface 66 of the second molding roller 54b is set to a plate thickness of the glass substrate to be formed, for example, 2.8 mm.

The drive mechanism 55 includes a motor 68 attached to one support frame 60, a pulley 70 that transmits the driving force of the motor to the central axes of the first and second molding rollers 54a and 54b, a drive belt 71, and the like.
The transport mechanism 56 includes a plurality of transport rollers 72 and a drive mechanism (not shown) that drives these transport rollers. The conveyance rollers 72 are disposed on both sides of the first and second molding rollers 54a and 54b, and are provided in parallel and horizontally with the first and second molding rollers.
The first and second molding rollers 54a and 54b, and the transport roller 72 are formed of a material that hardly adheres to glass and has excellent heat resistance, such as alumina, zirconia, and silica. Alternatively, the outer surface is coated. Further, the first and second molding rollers 54a and 54b may be configured to incorporate appropriate heating means such as a heater.

  When manufacturing the glass substrate 80 using the manufacturing apparatus 52 described above, as shown in FIGS. 5 and 6, first, a glass base plate 81 formed as a glass material in a plate shape having substantially the same dimensions as the glass substrate 80. The glass base plate is softened by heating to a temperature near the glass softening point, for example, 700 ° C. As the glass material, quartz glass, glass with reduced impurity content such as Na, blue plate glass, or the like can be used.

  Subsequently, the glass base plate 81 is horizontally supported on the transport roller 72 of the transport mechanism 56. In this state, the transport roller 72 is rotated, and the glass base plate 81 is transported along the longitudinal direction toward the first and second molding rollers 54a and 54b at a predetermined speed. At the same time, the drive mechanism 55 rotates the first and second molding rollers 54a and 54b in opposite directions. Thereby, the glass base plate 81 is conveyed from one side of the first and second molding rollers 54a and 54b to the other side, and is passed between the first and second molding rollers.

As shown in FIG. 7, while passing between the first and second molding rollers 54a, 54b, the glass base plate 81 is sandwiched from both sides by the outer peripheral surfaces 62, 66 of the first and second molding rollers, and the first A glass substrate 80 having a thickness matching the distance d between the first and second forming rollers is formed. At the same time, the upper surface of the glass base plate 81 is partially pressed by the plurality of ribs 64 provided on the first forming roller 54a, and extends in the longitudinal direction of the glass base plate in parallel with the transport direction of the glass base plate. A plurality of grooves 40 are formed.
After passing the first and second forming rollers 54a and 54b, the formed glass base plate 81 is cooled. Thereby, the glass substrate 80 in which the plurality of grooves 40 are integrally formed is manufactured. In addition, in addition to the height and width of the rib 64 provided in the 1st shaping | molding roller 54a, desired depth is controlled by controlling the rotational speed of the 1st and 2nd shaping | molding roller, and the conveyance speed of the glass base plate 81. And a groove 40 having a width is obtained.

  According to the glass substrate manufacturing apparatus and manufacturing method configured as described above, when the soft glass material is formed into a plate shape, the grooves are integrally formed by simultaneously forming the grooves with the ribs provided on the rollers. The glass substrate thus formed can be manufactured by one molding. Therefore, once the glass substrate is formed, there is no need to process the groove by sandblasting, cutting, or the like, and the manufacturing cost and manufacturing equipment can be greatly reduced. In addition, the glass substrate is less likely to be contaminated than when the grooves are post-processed by sandblasting, cutting, or the like, and the subsequent cleaning process can be simplified or omitted. Therefore, the glass substrate provided with the grooves can be manufactured at a low cost in a short time.

  Moreover, according to the manufacturing apparatus and manufacturing method of a glass substrate mentioned above, the glass substrate which improved mechanical strength compared with the past can be obtained. That is, when the groove is processed by sandblasting, cutting, or the like, the glass substrate is damaged, and the glass substrate is easily broken starting from the groove. On the other hand, according to the present embodiment, since the groove is formed simultaneously with the molding of the glass substrate, it is not a scratch caused by post-processing. Therefore, the groove portion is not easily broken and becomes a starting point of damage, and as a result, the mechanical strength can be improved.

  Furthermore, according to the glass substrate 80 manufactured according to the present embodiment, the light transmittance in the plate thickness direction is substantially equal between the portion where the groove 40 is formed and the other portion. The inventors have made a glass substrate 80 (referred to as the present example) manufactured by the above-described manufacturing apparatus and manufacturing method, and a glass substrate in which grooves having the same width and depth as the present embodiment are formed by sandblasting ( A glass substrate (referred to as Comparative Example 2) in which grooves were formed by cutting was prepared, and the light transmittance of each glass substrate was measured and a strength test was performed.

  As a method for measuring the transmittance, a method of measuring the luminous intensity of incident light incident on the glass substrate and the luminous intensity of the transmitted light passing through the glass substrate by a photoelectric photometry method, and obtaining the transmittance from the values was used. As shown in FIG. 8, the thickness of the glass substrate is 2.8 mm, the measurement points are the center A1 to A5 of the groove, and the center B1 to B5 between the adjacent grooves for other portions other than the groove, did.

  The strength test was a test in which a pressure terminal was brought into contact with a specific portion of the glass substrate, and the pressure applied using the load cell was continuously increased to measure the pressure at which the glass substrate cracks and breaks. Similarly to the above, the measurement locations were A1 to A5 and B1 to B5, and the measurement was performed with the pressure terminal in contact with the groove portion.

As a result, as shown in FIG. 9, according to the glass substrate 80 of the present embodiment, the transmittance of the portion where the groove 40 is formed averages 92.1%, and the transmittance of the other portion averages 90.3%. %, And the transmittance is substantially equal to each other. On the other hand, in Comparative Example 1, the average transmittance of the portion where the groove is formed is 59.0%, and the average transmittance of the other portion is 94.1%. %). In Comparative Example 2, the average transmittance of the portion where the groove is formed is 62.6%, the average transmittance of the other portion is 93.9%, and the transmittance of the groove forming portion is large (about 31). %).
Further, as shown in FIG. 10, the strengths of Comparative Example 1 and Comparative Example 2 are 0.70 MPa and 1.08 MPa on the average in the groove portions, respectively, whereas the glass substrate 80 of this embodiment is shown in FIG. The strength of is an average of 3.20 MPa in the groove portion, and it can be seen that the mechanical strength is higher than those of Comparative Examples 1 and 2.

  Next, a glass substrate manufacturing method and manufacturing apparatus according to a second embodiment of the present invention will be described. As shown in FIGS. 11 and 12, according to the manufacturing apparatus 52 according to the second embodiment, the plurality of ribs 64 projecting from the outer peripheral surface 62 of the first molding roller 54a are each formed in a straight line shape. , Extending parallel to the central axis of the first molding roller. The ribs 64 are spaced apart from each other along the circumferential direction of the first molding roller 54a, and project radially from the outer peripheral surface of the roller. The number of ribs 64 installed and the pitch in the circumferential direction are set corresponding to the number and pitch of the grooves 40 formed in the glass substrate.

  The height and width of each rib 64 are formed according to the depth and width of the groove 40 to be formed. For example, the height of the rib 64 is formed to be 200 to 300 μm. In FIGS. 11 and 12, the number of ribs 64 and grooves 40 is shown to be smaller than the actual number in order to avoid complication of the drawings. In the second embodiment, the other configuration of the manufacturing apparatus is the same as that of the first embodiment described above, and the same parts are denoted by the same reference numerals and the detailed description thereof is omitted.

  When manufacturing the glass substrate 80 using the manufacturing apparatus 52, as shown in FIG. 11 and FIG. 12, the glass base plate 81 formed in the plate shape of the substantially same dimension as the glass substrate 80 is prepared, and this glass base plate Is heated to a temperature near the glass softening point, for example, 700 ° C. to be softened. Subsequently, the glass base plate 81 is horizontally supported on the transport roller 72 of the transport mechanism 56. In this state, the conveyance roller 72 is rotated and conveyed at a predetermined speed along the longitudinal direction of the glass base plate and toward the first and second molding rollers 54a and 54b. At the same time, the drive mechanism 55 rotates the first and second molding rollers 54a and 54b in opposite directions. Thereby, the glass base plate 81 is conveyed from one side of the first and second molding rollers 54a and 54b to the other side, and is passed between the first and second molding rollers.

As shown in FIG. 13, while passing between the first and second molding rollers 54a, 54b, the glass base plate 81 is sandwiched from both sides by the outer peripheral surfaces 62, 66 of the first and second molding rollers, and the first A glass plate 80 having a thickness matching the distance d between the first and second forming rollers is formed. At the same time, the upper surface of the glass base plate 81 is partially pressed by the plurality of ribs 64 provided on the first forming roller 54a, and extends in the direction perpendicular to the conveying direction of the glass base plate, that is, in the width direction of the glass base plate. A plurality of grooves 40 are sequentially formed.
After passing the first and second molding rollers 54a and 54b, the molded glass base plate 81 is cooled to manufacture the glass substrate 80 in which the plurality of grooves 40 are integrally molded. In addition, in addition to the height and width of the rib 64 provided in the 1st shaping | molding roller 54a, desired depth is controlled by controlling the rotational speed of the 1st and 2nd shaping | molding roller, and the conveyance speed of the glass base plate 81. And a groove 40 having a width is obtained.

  According to the manufacturing apparatus and the manufacturing method, the glass substrate 80 integrally provided with the plurality of grooves 40 respectively extending in the width direction of the substrate is obtained. In addition, also in the second embodiment, the same effect as in the first embodiment described above can be obtained.

  In the above-described embodiment, the glass substrate is formed using one set of the first and second forming rollers 54a and 54b. However, the glass substrate is formed using two sets of the first and second forming rollers. It is good also as composition to do. That is, as shown in FIGS. 14 and 15, according to the third embodiment of the present invention, one set of first and second forming rollers 54a and 54b and another set of first and second forming rollers are provided. -54c and 54d are provided side by side in the conveying direction of the glass base plate 81. A plurality of linear ribs 64 are provided on the outer peripheral surface 62 of the first molding roller 54a, and extend along the axial direction of the roller and are separated from each other along the circumferential direction of the roller. A plurality of annular ribs 64 are provided coaxially with the outer peripheral surface 62 of the other first molding roller 54c and extend along the circumferential direction of the roller and are spaced apart from each other along the axial direction of the roller. ing.

In the third embodiment, the other configuration of the manufacturing apparatus is the same as that of the first embodiment described above, and the same reference numerals are given to the same portions, and detailed description thereof is omitted. In the third embodiment, as shown in FIG. 15, by conveying the glass base plate 81 through the first and second forming rollers 54 a and 54 b, the glass base plate is formed to a predetermined plate thickness, At the same time, a plurality of grooves 40a extending in the direction orthogonal to the transport direction are formed. Subsequently, by passing the glass base plate 81 between the first and second forming rollers 54c and 54d of the other set, a plurality of grooves 40b extending in parallel with the conveying direction of the glass base plate is formed. Thereby, as shown in FIG. 16, a glass substrate 80 is obtained in which a plurality of grooves 40a parallel to each other and a plurality of grooves 40b perpendicular to these grooves 40a are integrally formed.
Note that the arrangement of the first molding rollers 54a and 54c may be reversed, and the grooves 40b extending in the transport direction may be formed first, and then the grooves 40a extending perpendicular to these grooves may be formed.

  In the embodiment described above, the groove is formed only on one surface of the glass substrate. However, as in the fourth embodiment shown in FIGS. 17 and 18, the first and second forming rollers 54a and 54b are formed. It is good also as a structure which shape | molds the glass substrate which has a groove | channel on both surfaces. In this case, groove forming ribs are provided on the outer peripheral surface of the first molding roller 54a and the outer peripheral surface of the second molding roller 54b, respectively.

  The ribs 64 of the first molding roller 54a are each formed in a straight line, extend along the axial direction of the roller, and are spaced apart from each other along the circumferential direction of the roller. The ribs 64 of the second forming roller 54b are each formed in an annular shape coaxial with the roller, extend along the circumferential direction of the roller, and are spaced apart from each other along the axial direction of the roller.

In the fourth embodiment, the other configuration of the manufacturing apparatus is the same as that of the first embodiment described above, and the same reference numerals are given to the same portions, and detailed description thereof is omitted. In 4th Embodiment, as shown in FIG. 18, a glass base plate is shape | molded by predetermined | prescribed plate | board thickness by conveying the glass base plate 81 through between the 1st and 2nd shaping | molding rollers 54a and 54b. At the same time, the ribs 64 of the first molding roller 54a form a plurality of grooves 40a extending in the direction orthogonal to the conveying direction on one surface, and the ribs 4 of the second molding roller 54b form the glass base plate. A plurality of grooves 40b extending in parallel with the conveying direction are formed on the other surface. Accordingly, as shown in FIG. 19, a plurality of grooves 40a parallel to each other are formed on one surface, and a plurality of grooves 40b extending in a direction perpendicular to the grooves 40a are integrally formed on the other surface. A substrate 80 is obtained.
In addition, also in 3rd and 4th embodiment, the effect similar to 1st Embodiment mentioned above can be acquired.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  The present invention can be applied not only to a glass substrate used for SED but also to a glass substrate used for other image display devices. Further, the material and thickness of the glass substrate, the width, depth, number, pitch, and the like of the grooves are not limited to the above-described embodiments, and can be appropriately changed as necessary.

The perspective view which shows SED provided with the glass substrate. The perspective view of said SED fractured | ruptured along line AA of FIG. Sectional drawing which expands and shows the said SED. The top view which shows the wiring structure of said SED. The perspective view which shows the manufacturing apparatus which concerns on 1st Embodiment of this invention. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 1st Embodiment. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 1st Embodiment. The figure which shows the predetermined location of the glass substrate at the time of the transmittance | permeability measurement and intensity | strength measurement. The figure which shows the result of the light transmittance measurement regarding a present Example, the comparative example 1, and the comparative example 2. FIG. The figure which shows the result of the intensity | strength measurement regarding a present Example, the comparative example 1, and the comparative example 2. FIG. The perspective view which shows the manufacturing apparatus which concerns on 2nd Embodiment of this invention. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 2nd Embodiment. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 2nd Embodiment. Sectional drawing which shows schematically the manufacturing apparatus and manufacturing process which concern on 3rd Embodiment of this invention. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 3rd Embodiment. The perspective view which shows the glass substrate manufactured by the manufacturing apparatus and manufacturing process which concern on the said 3rd Embodiment. Sectional drawing which shows schematically the manufacturing apparatus and manufacturing process which concern on 4th Embodiment of this invention. Sectional drawing which shows schematically the manufacturing process of the glass substrate in the said 4th Embodiment. The perspective view which shows the glass substrate manufactured by the manufacturing apparatus and manufacturing process which concern on the said 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st board | substrate, 12 ... 2nd board | substrate, 14 ... Side wall, 15 ... Vacuum envelope,
16 ... phosphor screen, 40, 40a, 40b ... groove, 42 ... scanning line,
46 ... Signal line 54a, 54c ... First forming roller,
54b, 54d ... second molding roller, 55 ... drive mechanism, 56 ... transport mechanism,
62, 66 ... outer peripheral surface, 64 ... rib

Claims (10)

A glass substrate used for an image display device,
A plurality of grooves are integrally formed on at least one surface, and the portion where the grooves are formed and the other portion have the same light transmittance in the plate thickness direction. Glass substrate. A glass substrate used for an image display device,
A plurality of parallel first grooves are integrally formed on one surface, and a plurality of second grooves are integrally formed on the other surface along a direction intersecting the first groove,
A glass substrate used for an image display device, wherein the portion where the first and second grooves are formed and the other portion have the same light transmittance in the thickness direction. A glass substrate used for an image display device,
A portion in which a plurality of parallel first grooves and a plurality of second grooves extending in a direction orthogonal to the first grooves are integrally formed on at least one surface, and the first and second grooves are formed. A glass substrate for use in an image display device, characterized in that the light transmittance in the thickness direction is the same as that in other portions. In the manufacturing method of the glass substrate used for the image display device,
Prepare a pair of rollers with a plurality of ribs projecting from the outer peripheral surface of at least one roller,
The pair of rollers are arranged to face each other at a predetermined interval,
While rotating the pair of rollers, the softened glass material is passed between the pair of rollers to form a glass substrate having a plate thickness corresponding to the predetermined interval, and at the same time, at least one surface of the glass substrate by the ribs A method for producing a glass substrate, comprising forming a groove.   The plurality of ribs provided on the one roller are each formed in an annular shape and extend in the circumferential direction of the roller, and are spaced apart from each other in the axial direction of the roller. The method for producing a glass substrate according to claim 4, wherein a plurality of grooves each extending in parallel with the passing direction of the glass material are formed on one surface.   The plurality of ribs provided on the one roller are linearly formed and extend in parallel with the central axis of the roller and are spaced apart from each other in the circumferential direction of the roller. The method for producing a glass substrate according to claim 3, wherein a plurality of grooves each extending in a direction orthogonal to the passing direction of the glass material are formed on at least one surface of the glass substrate. In the manufacturing method of the glass substrate used for the image display device,
A first roller provided with a plurality of ribs extending along the circumferential direction on the outer peripheral surface and a second roller provided with a plurality of ribs extending along the axial direction on the outer peripheral surface, respectively.
The first and second rollers are arranged opposite to each other in parallel at a predetermined interval,
While rotating the first and second rollers, the softened glass material is passed between the first and second rollers to form a glass substrate having a thickness corresponding to the predetermined interval, and at the same time, the glass substrate by the ribs. A method for producing a glass substrate, comprising: forming a plurality of grooves extending in directions perpendicular to each other on one surface and the other surface of the glass substrate. In a glass substrate manufacturing apparatus used for an image display device,
First and second rollers arranged opposite to each other in parallel at a predetermined interval;
A transport mechanism for transporting the softened glass material through the first and second rollers,
The first and second rollers are spaced apart from each other by a predetermined distance, and when the glass material softened between the first and second rollers passes, outer peripheral surfaces for forming the glass material to a predetermined plate thickness are respectively provided. Have
At least one of the first and second rollers is provided on an outer peripheral surface thereof, and when the softened glass material passes between the first and second rollers, the softened glass material is pressed and grooves are formed on the surface of the glass substrate. An apparatus for manufacturing a glass substrate, comprising: a plurality of ribs for forming the substrate.   The plurality of ribs provided on the one roller are each formed in an annular shape and extend in the circumferential direction of the roller, and are spaced apart in the axial direction of the roller. The glass substrate manufacturing apparatus according to 8.   The plurality of ribs provided on the one roller are each formed in a straight line, extend in parallel with the central axis of the roller, and are spaced apart from each other in the circumferential direction of the roller. The glass substrate manufacturing apparatus according to claim 8.

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