JP2015090387A - Optical image forming member, glass laminate for the same, and manufacturing methods for both - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical image forming member capable of forming high-resolution images without increasing cost; a glass laminate for producing the same; and manufacturing methods for both.SOLUTION: An optical image forming member is produced by bonding glass laminates for an optical image forming member, in which the glass laminate is obtained by alternately laminating glass films and reflective films. The glass films constituting the glass laminate for the optical image forming member are produced by drawing molten glass into plate shape. The glass laminate for the optical image forming member has at least one glass film laminated such that a drawing direction thereof is perpendicular to the drawing direction of other glass films.

Description

  The present invention relates to an optical imaging member, a glass laminate for optical imaging, and a method for manufacturing the same, and, for example, glass for forming a hollow image of light generated from a flat panel display such as a liquid crystal display or an organic EL display. The present invention relates to a laminate, an optical imaging member, and an optical imaging member manufacturing method.

  As is well known, from the viewpoint of space saving, flat panel displays such as liquid crystal displays, plasma displays, and organic EL displays are widely used.

  In addition, technology development is progressing to form a hollow image of light generated from a flat panel display. Patent Document 1 proposes an optical imaging member in which a plurality of double-sided reflection bands are arranged at regular intervals so that adjacent reflecting surfaces face each other. However, the optical imaging member described in Patent Document 1 has a problem that it does not necessarily converge to one point after scattered light has passed.

JP 58-21702 A

  In order to solve the above problems, after laminating hundreds to thousands of transparent plates whose one surface is a reflection surface, the transparent plates are cut so that a cut surface perpendicular to each reflection surface is formed. After forming the laminated body, the laminated bodies are placed facing each other so that the reflective film surface of one laminated body and the reflective film surface of the other laminated body are orthogonal to each other, and are in close contact with each other. Members are being considered. In this optical imaging member, the thickness of the transparent plate corresponds to the interval between the reflecting surfaces.

  In the case of the above optical imaging member, in order to obtain high-resolution imaging, a thin transparent plate is adopted, and the transparent plate is in a parallel state so that the spacing between all reflecting surfaces is uniform. It is important that they are laminated.

  However, if there is uneven thickness (thickness tolerance) in the transparent plate, the uneven thickness is accumulated by the number of laminated sheets, which may greatly affect the uniformity of the surface spacing of the reflecting surfaces.

  The present invention has been made in view of the above circumstances, an optical imaging member capable of obtaining high-resolution imaging without incurring an increase in cost, a glass laminate for producing the optical imaging member, and those It is to obtain a manufacturing method.

  As a result of diligent efforts, the present inventor uses a glass film as a transparent plate, interposes a reflective film between the glass films, and applies a laminated glass integrated body to the optical imaging member. The distance between the reflective surfaces can be easily reduced, and when a glass film is formed by the plate drawing method, uneven thickness (thickness distribution) is generated in the direction orthogonal to the plate drawing direction, and the thickness of the streaks along the plate drawing direction is increased. Although it is easy to produce a meat | flesh part, it discovers that the bad influence to the surface interval of the reflective surface by accumulation of this uneven thickness can be reduced by changing the lamination direction of a glass film, and proposes as this invention.

  The glass laminate for an optical imaging member of the present invention is a glass laminate for an optical imaging member in which glass films and reflective films are alternately laminated, and the glass film is produced by drawing a molten glass into a plate. The glass laminate is characterized in that at least one glass film is laminated in a state in which the drawing direction is orthogonal to other glass films. Here, “the glass film and the reflective film are alternately laminated” is not limited to the case where the glass film and the reflective film are alternately laminated, and one or more layers are provided therebetween. It also includes the case where the other materials are alternately stacked in the state of interposing.

  According to this configuration, since a thin glass film that can be mass-produced is used as a transparent plate, it is possible to reduce the interval between the reflecting surfaces of the laminate while suppressing an increase in member cost. Furthermore, since the glass films constituting the laminated body are laminated so that the drawing direction is not the same, it is possible to reduce the influence of uneven thickness and make the surface spacing of the reflecting surfaces uniform. Therefore, if this glass laminate is used, an optical imaging member capable of forming a high-resolution image can be obtained.

  In the glass laminate for an optical imaging member, each glass film constituting the glass laminate is preferably strip-shaped.

  In the glass laminated body for an optical imaging member, the glass film preferably has a thickness of 3000 μm or less.

  In the optical imaging member of the present invention, the pair of glass laminates for an optical imaging member described above are arranged so that the reflective film surface of one glass laminate and the reflective film surface of the other glass laminate are orthogonal to each other. It is characterized by being arranged. Here, the “reflection film surface” means a surface on which a reflection film is formed.

  According to this configuration, since a thin glass film that can be mass-produced is used as a transparent plate, it is possible to reduce the interval between the reflecting surfaces of the laminate while suppressing an increase in member cost. Furthermore, since the glass films constituting the laminated body are laminated so that the drawing direction is not the same, it is possible to reduce the influence of uneven thickness and make the surface spacing of the reflecting surfaces uniform. Therefore, high resolution imaging can be obtained.

The manufacturing method of the glass laminated body for optical imaging members of this invention is a manufacturing method of the glass laminated body for optical imaging members which laminates | stacks a glass film with a reflecting film so that a reflecting film and a glass film may be laminated | stacked alternately. There,
The glass film is made by drawing a molten glass, and at least one glass film is laminated with a glass film with a reflective film so that the drawing direction is perpendicular to other glass films. Features.

  According to this method, it is possible to form a laminate in which the interval between the reflecting surfaces is reduced while suppressing an increase in member cost. In addition, it is possible to reduce the influence of uneven thickness and make the spacing between the reflecting surfaces uniform.

  In the above method for producing a glass laminate for an optical imaging member, after laminating a glass film with a reflective film, it is further cut into a direction perpendicular to the reflective film surface to form a glass laminate composed of strip-shaped glass films. Is preferred. In the following description, a glass laminate composed of strip glass films is simply referred to as a strip glass laminate.

  In the method for producing a glass laminate for an optical imaging member, it is preferable to produce a glass laminate using a glass film having a thickness of 3000 μm or less.

  In the method for producing a glass laminate for an optical imaging member, it is preferable to produce a glass laminate using a glass film having an aspect ratio of 1.3 or less.

  The glass laminate for an optical imaging member of the present invention is produced by the above-described method for producing a glass laminate for an optical imaging member.

  The method for producing an optical imaging member according to the present invention includes the above-described pair of glass laminates, the glass laminate so that the reflective film surface of one glass laminate and the reflective film surface of the other glass laminate are orthogonal to each other. And arranging them to obtain an optical imaging member.

  According to this method, an optical imaging member capable of forming a high-resolution image can be easily manufactured.

  The method for producing an optical imaging member of the present invention comprises a pair of glass laminates produced by the above-described method for producing a glass laminate for an optical imaging member, the reflective film surface of one glass laminate and the other glass laminate. And a step of obtaining an optical imaging member by arranging so that the reflecting film surfaces of the body are orthogonal to each other.

  According to this method, an optical imaging member capable of forming a high-resolution image can be easily manufactured.

  The optical imaging member of the present invention is manufactured by the above-described optical imaging member manufacturing method.

  The glass film of this invention is a glass film used for the glass laminated body for optical coupling members, Comprising: The aspect ratio of a glass film is 1.3 or less, It is characterized by the above-mentioned.

  The glass film preferably has a thickness of 3000 μm or less.

It is a conceptual perspective view which shows an example of the glass laminated body of this invention. It is a conceptual perspective view which shows an example of the lamination | stacking method of a glass film. It is a conceptual perspective view which shows an example of the strip-shaped glass laminated body of this invention. It is a conceptual perspective view which shows an example of the optical image formation member of this invention. It is a conceptual perspective view which shows an example of the optical image formation member of this invention.

  The present invention is described in detail below.

  The glass laminate of the present invention includes a glass film as its main constituent material. The glass film is produced by drawing a molten glass. Although there is no restriction | limiting in the method of plate drawing, It is preferable to shape | mold by the overflow downdraw method. The glass film produced by this method has excellent surface quality and does not require polishing. The reason why the glass film formed by the overflow down draw method is excellent in surface quality is that the surface to be the surface of the glass film is not in contact with the bowl-shaped refractory and is formed in a free surface state. Here, the overflow down draw method is a glass film in which the molten glass overflows from both sides of the heat-resistant bowl-shaped structure, and the overflowed molten glass is stretched and formed downward at the lower end of the bowl-shaped structure. It is a method of manufacturing. The structure and material of the bowl-shaped structure are not particularly limited as long as the dimensions and surface accuracy of the glass film are set to a desired state and the quality usable for the glass film can be realized. Moreover, in order to perform the downward stretch molding, any force may be applied to the glass. For example, a method may be adopted in which a heat-resistant roll having a sufficiently large width is rotated and stretched in contact with glass, or a plurality of pairs of heat-resistant rolls are contacted only near the end face of the glass. It is also possible to adopt a method of stretching by stretching. In addition to the overflow downdraw method, for example, a molding method such as a slot downdraw method or a redraw method may be employed.

  The thickness of the glass film is preferably 3000 μm or less, particularly 2800 μm or less, 2000 μm or less, 1800 μm or less, 1500 μm or less, 1200 μm or less, 1000 μm or less, 800 μm or less, 700 μm or less, 500 μm or less, 300 μm or less, 200 μm or less, 100 μm or less, 90 μm or less, 80 μm or less, 70 μm or less, 60 μm or less, 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, and particularly preferably 10 μm or less. The thinner the glass film is, the narrower the interval between the reflecting films, so that it becomes easier to obtain a high-resolution image.

  The surface roughness Ra of the surface of the glass film is preferably 100 mm or less, 50 mm or less, 10 mm or less, 8 mm or less, 4 mm or less, 3 mm or less, particularly 2 mm or less. If the surface roughness Ra of the surface of the glass film is too large, the interval between the reflective films tends to vary, making it difficult to obtain a high-resolution image. Furthermore, when laminating a glass film, it becomes easy to entrain air and it is difficult to carry out optical carboxylation.

  The surface roughness Ra of the end face of the glass film is preferably 100 mm or less, 50 mm or less, 10 mm or less, 8 mm or less, 4 mm or less, 3 mm or less, particularly 2 mm or less. If the surface roughness Ra of the end face of the glass film is too large, the glass laminate is easily damaged.

  The waviness of the glass film is preferably 1 μm or less, 0.08 μm or less, 0.05 μm or less, 0.03 μm or less, 0.02 μm or less, particularly 0.01 μm or less. If the waviness of the glass film is too large, the distance between the reflective films tends to vary, making it difficult to obtain a high-resolution image. Furthermore, when laminating a glass film, it becomes easy to entrain air and it is difficult to carry out optical carboxylation.

  The difference between the maximum thickness and the minimum thickness of the glass film is preferably 10 μm or less, 5 μm or less, 2 μm or less, particularly 1 μm or less. If this difference is too large, the interval between the reflective films tends to vary, making it difficult to obtain high-resolution imaging. Furthermore, when laminating a glass film, it becomes easy to entrain air and it is difficult to carry out optical carboxylation.

  The glass film preferably has an unpolished surface. The theoretical strength of glass is inherently very high, but breakage is often caused even by a stress much lower than the theoretical strength. This is because a small defect called Griffith Flow is generated on the surface of the glass film in a process after glass molding, such as a polishing process. Therefore, if the surface of the glass film is unpolished, the original mechanical strength is hardly impaired, and the glass film is difficult to break. Moreover, since a grinding | polishing process can be skipped, the manufacturing cost of a glass film can be reduced. If the entire effective surface of both surfaces is an unpolished surface, the glass film is more difficult to break.

  The width dimension of the glass film is preferably 500 mm or more, 600 mm or more, 800 mm or more, 1000 mm or more, 1200 mm or more, 1500 mm or more, particularly 2000 mm or more. If it does in this way, it will become easy to enlarge an optical image formation member. On the other hand, if the width dimension of the glass film is too large, it is difficult to cut the glass laminate in a direction perpendicular to the surface on which the reflective film is formed. Therefore, the width dimension of the glass film is preferably 3500 mm or less, 3200 mm or less, particularly 3000 mm or less.

  The shape of the glass film is preferably as close to a square as possible. The reason for this is that when laminating a glass film with a reflective film so that at least one glass film and the other glass film are perpendicular to the drawing direction, the closer the glass film is to a square, the fewer parts to be discarded, This is because the yield is improved. Specifically, the glass film has an aspect ratio (L / W) of 1.3 or less, 1.27 or less, 1.25 or less, 1.2 or less, 1.15 or less, 1.10 or less. It is preferably set to 05 or less, particularly 1.03 or less.

  The crack occurrence rate of the glass film is preferably 70% or less, 50% or less, 40% or less, 30% or less, particularly 20% or less. If it does in this way, it will become difficult to break a glass layered product. Here, the “crack occurrence rate” is a constant temperature and humidity chamber maintained at a humidity of 30% and a temperature of 25 ° C., and a Vickers indenter set at a load of 1000 g is driven into the glass surface (optical polishing equivalent surface) for 15 seconds. After counting the number of cracks generated from the four corners of the indentation after 15 seconds (maximum 4 per indentation), this operation was repeated 20 times (that is, the indenter was driven 20 times), and the total number of cracks was counted The value obtained by the total number of cracks / 80.

The liquidus temperature of the glass film is preferably 1200 ° C. or lower, 1150 ° C. or lower, 1130 ° C. or lower, 1110 ° C. or lower, 1090 ° C. or lower, particularly 1070 ° C. or lower. The liquid phase viscosity of the glass film is preferably 10 ^5.0 dPa · s or more, 10 ^5.6 dPa · s or more, 10 ^5.8 dPa · s or more, particularly 10 ^6.0 dPa · s or more. If it does in this way, it will become difficult to devitrify glass at the time of fabrication. The “liquid phase temperature” is obtained by passing the standard sieve 30 mesh (500 μm) and putting the glass powder remaining in 50 mesh (300 μm) into a platinum boat and holding it in a temperature gradient furnace for 24 hours to precipitate crystals. Refers to the value measured temperature. “Liquid phase viscosity” refers to a value obtained by measuring the viscosity of glass at the liquid phase temperature by a platinum ball pulling method.

  The Young's modulus of the glass film is preferably 65 GPa or more, 67 GPa or more, 68 GPa or more, 69 GPa or more, 70 GPa or more, 71 GPa or more, 72 GPa or more, particularly 75 GPa or more. If it does in this way, after forming a reflecting film in the surface of a glass film, a glass film becomes difficult to warp, As a result, the space | interval of a reflecting film becomes difficult to fluctuate and it becomes easy to obtain high-resolution imaging. “Young's modulus” refers to a value measured by a resonance method.

The density of the glass film is preferably 2.7 g / cm ³ or less, 2.6 g / cm ³ or less, 2.5 g / cm ³ or less, particularly 2.4 g / cm ³ or less. In this way, it becomes easy to reduce the weight of the optical imaging member.

The thermal expansion coefficient of the glass film is preferably 25 to 100 × 10 ⁻⁷ / ° C., 30 to 90 × 10 ⁻⁷ / ° C., 30 to 60 × 10 ⁻⁷ / ° C., 30 to 45 × 10 ⁻⁷ / ° C., In particular, it is 30 to 40 × 10 ⁻⁷ / ° C. If it does in this way, it will become easy to match with the thermal expansion coefficient of various functional films. “Thermal expansion coefficient” refers to a value obtained by measuring an average thermal expansion coefficient at 30 to 380 ° C. using a dilatometer. As a sample for measuring the thermal expansion coefficient, φ5 mm × with end-face processed R A 20 mm cylindrical sample is used.

  The strain point of the glass film is preferably 600 ° C. or higher, particularly 630 ° C. or higher. If it does in this way, it will become easy to improve heat resistance. The “strain point” refers to a value measured based on the method of ASTM C336-71.

  The transmittance of the glass film in terms of a thickness of 500 μm and a wavelength of 300 nm is preferably 30% or more, 50% or more, 70% or more, 80% or more, 85% or more, particularly 89% or more. The transmittance at a thickness of 500 μm and a wavelength of 350 nm is preferably 50% or more, 70% or more, 80% or more, 85% or more, 89% or more, 90% or more, particularly 91% or more. Moreover, the transmittance | permeability in thickness 500micrometer conversion and wavelength 550nm is 85% or more, 89% or more, 90% or more, especially 91% or more. In this way, when applied to an optical coupling member or the like, when light is transmitted while being repeatedly reflected, the loss of light is reduced, and high-resolution imaging is easily obtained.

  The haze of the glass film is preferably 10% or less, 5% or less, 3% or less, 1% or less, 0.5% or less, particularly 0.3% or less. In this way, it becomes possible to reduce the diffuse reflection on the surface, and when applied to an optical coupling member or the like, the light loss is reduced when light is transmitted while repeating reflection, and high resolution is achieved. This makes it easy to obtain the image. Note that “Haze” can be measured with a commercially available Haze meter.

Glass films, as a glass composition, in _{mass%, SiO 2 35~80%, Al} 2 O 3 0~20%, B 2 O 3 0~17%, 0~10% MgO, CaO 0~15%, SrO It is preferable to contain 0 to 15% and BaO 0 to 30%. The reason for limiting the content range of each component as described above is shown below. In addition, in description regarding a glass composition,% display points out the mass%.

The content of SiO ₂ is preferably 35 to 80%. When the content of SiO ₂ is too large, the melting property, the moldability tends to decrease. Therefore, the content of SiO ₂ is preferably 75% or less, 64% or less, 62% or less, and particularly 61% or less. On the other hand, if the content of SiO ₂ is too small, it becomes difficult to form a glass network structure, and vitrification becomes difficult, the rate of occurrence of cracks increases, and acid resistance tends to decrease. Therefore, the content of SiO ₂ is preferably 40% or more, 50% or more, 55% or more, particularly 57% or more.

The content of Al ₂ O ₃ is preferably 0 to 20%. When the content of Al ₂ O ₃ is too large, devitrification crystal glass is precipitated, the liquid phase viscosity tends to decrease. The content of Al ₂ O ₃ is preferably 18% or less, 17.5% or less, particularly 17% or less. On the other hand, when the content of Al ₂ O ₃ is too small, the strain point, the Young's modulus tends to decrease. Therefore, the content of Al ₂ O ₃ is preferably 3% or more, 5% or more, 8.5% or more, 10% or more, 12% or more, 13% or more, 13.5% or more, 14% or more, particularly 14.5% or more.

The content of B ₂ O ₃ is preferably 0 to 17%. When the content of B ₂ O ₃ is too large, the strain point, the Young's modulus, acid resistance tends to decrease. Therefore, the content of B ₂ O ₃ is preferably 15% or less, 13% or less, 12% or less, 11% or less, particularly 10.4% or less. On the other hand, when the content of B ₂ O ₃ is too small, the high-temperature viscosity becomes high, the meltability is lowered, the crack generation rate is increased, the liquidus temperature is increased, and the density is easily increased. Therefore, the content of B ₂ O ₃ is preferably 2% or more, 3% or more, 4% or more, 5% or more, 7% or more, 8.5% or more, 8.8% or more, particularly 9% or more. is there.

  MgO is a component that increases the Young's modulus and strain point and decreases the high-temperature viscosity and crack generation rate. However, if the content of MgO is too large, the liquidus temperature rises and the devitrification resistance tends to decrease, and in addition, the BHF resistance tends to decrease. Therefore, the content of MgO is preferably 10% or less, 5% or less, 3% or less, 2% or less, 1.5% or less, 1% or less, particularly 0.5% or less.

  The content of CaO is preferably 0 to 15%. When there is too much content of CaO, a density and a thermal expansion coefficient will become high easily. Therefore, the content of CaO is preferably 12% or less, 10% or less, 9% or less, and particularly 8.5% or less. On the other hand, when there is too little content of CaO, a meltability and a Young's modulus will fall easily. Therefore, the CaO content is preferably 2% or more, 3% or more, 5% or more, 6% or more, 7% or more, particularly 7.5% or more.

  The content of SrO is preferably 0 to 15%. When there is too much content of SrO, a density and a thermal expansion coefficient will become high easily. Therefore, the content of SrO is preferably 12% or less, 10% or less, 6% or less, 5% or less, and particularly 6.5% or less. On the other hand, when there is too little content of SrO, a meltability and chemical resistance will fall easily. Therefore, the content of SrO is preferably 0.5% or more, 1% or more, 2% or more, 3% or more, particularly 3.5% or more.

  When there is too much content of BaO, a density and a thermal expansion coefficient will become high easily. Therefore, the content of BaO is preferably 30% or less, 25% or less, 20% or less, 15% or less, 10% or less, 5% or less, 2% or less, 1% or less, particularly 0.5% or less. .

  When a plurality of MgO, CaO, SrO, and BaO components are introduced, the liquidus temperature is lowered, and it is difficult for crystal foreign matter to be generated in the glass. On the other hand, if the total amount of these components is too small, the function as a flux cannot be sufficiently exhibited, and the meltability tends to be lowered. Therefore, the total amount of these components is preferably 5% or more, 8% or more, 9% or more, 11% or more, particularly 13% or more. On the other hand, if the total amount of these components is too large, the density increases and it becomes difficult to reduce the weight of the glass, and the crack generation rate tends to increase. Therefore, the total amount of these components is preferably 30% or less, 20% or less, 18% or less, and particularly 15% or less. In particular, when priority is given to lowering the density of the glass film, the total amount of these components is preferably 5% or more, particularly 8% or more, and 13% or less, 11% or less, particularly 10% or less.

  ZnO is a component that increases meltability and Young's modulus. However, when the content of ZnO is too large, the glass is devitrified, the strain point is lowered, and the density is easily increased. Therefore, the content of ZnO is preferably 15% or less, 10% or less, 5% or less, 3% or less, 1% or less, particularly 0.5% or less.

ZrO ₂ is a component that increases the Young's modulus. However, when the content of ZrO ₂ is too large, the liquidus temperature rises and zircon devitrification foreign matter is likely to be generated. Therefore, the content of ZrO ₂ is preferably 3% or less, 1% or less, 0.5% or less, particularly 0.1% or less.

The upper limit content of Fe ₂ O ₃ is preferably 1000 ppm (0.1%) or less, 800 ppm or less, 300 ppm or less, 200 ppm or less, 130 ppm or less, 100 ppm or less, 80 ppm or less, 60 ppm or less, 40 ppm or less, 30 ppm or less, 20 ppm or less The lower limit content is preferably 1 ppm or more, particularly 3 ppm or more. The lower the Fe ₂ O ₃ content, the higher the transmittance. Therefore, when it is applied to an optical coupling member or the like, the light loss is reduced when light is transmitted while repeating reflection, and high resolution results are obtained. It becomes easy to obtain an image. In order to reduce the content of Fe ₂ O ₃ , it is preferable to use a high-purity raw material.

Y ₂ O ₃ , Nb ₂ O ₃ , and La ₂ O ₃ are components that increase the strain point, Young's modulus, and the like. However, if the content of these components is too large, the density tends to increase. Therefore, the content of Y ₂ O ₃ , Nb ₂ O ₃ and La ₂ O ₃ is preferably 3% or less.

As a fining _{agent, As 2 O 3, Sb 2} O 3, CeO 2, SnO 2, F, Cl, selected from the group of SO ₃ was one or two or more may be added 0-3%. However, As ₂ O ₃ , Sb ₂ O ₃ and F, especially As ₂ O ₃ and Sb ₂ O ₃ are preferably refrained from use as much as possible from an environmental point of view, and each content is less than 0.1%. It is preferable to limit to. Preferred fining agents _are SnO 2, _{SO 3} and Cl. The content of SnO ₂ is preferably 0 to 1%, 0.01 to 0.5%, particularly 0.05 to 0.4%. Further, the content of SnO ₂ + SO ₃ + Cl (total amount of SnO ₂ , SO ₃ and Cl) is preferably 0.001 to 1%, 0.01 to 0.5%, particularly 0.01 to 0.3. %.

  In addition to the above components, other components may be added, and the content of other components is preferably 10% or less, particularly preferably 5% or less.

  The glass laminate of the present invention includes a reflective film as its main constituent material. The reflective film is formed on the surface of the glass film.

  Various materials can be used for the reflective film, and among these, Al or Ag is preferable from the viewpoint of obtaining a high-resolution image.

  There are various methods for forming the reflective film on the surface of the glass film, and examples thereof include vapor deposition, sputtering, and plating. In particular, from the viewpoint of film formation efficiency, it is preferable to form the reflective film by sputtering.

  It is preferable to electrolytically polish a reflective film (particularly an Al reflective film) formed by sputtering or vapor deposition. In this way, the regular reflectance of the reflective film is improved, and the image quality of the image formed can be improved.

  As another method of forming a reflective film on the surface of the glass film, a method of attaching a resin film with a reflective film can be employed. In this way, the formation cost of the reflective film can be reduced.

  As another method of forming a reflective film on the surface of the glass film, a method of laminating and baking the obtained glass film after applying and drying a metal paste such as an Al paste or an Ag paste can be employed. In this method, the metal paste preferably contains glass frit. If it does in this way, fixation of glass films and formation of a reflecting film can be performed by simultaneous baking.

Further, for the purpose of protecting the reflective film formed by the above various methods, a protective film such as a SiO ₂ film can be provided on the reflective film.

  The glass laminate of the present invention is formed by alternately laminating glass films and reflection films. As a method of alternately laminating a glass film and a reflective film, it is preferable to laminate a glass film having a reflective film formed on at least one surface. If it does in this way, it will become easy to reduce the manufacturing cost of a glass laminated body. In particular, from the viewpoint of film formation efficiency, it is more preferable to laminate a glass film having a reflective film formed only on one surface so that the glass film and the reflective film are alternately arranged. In addition to this, a method of alternately laminating a glass film having a reflective film on both surfaces and a glass film having no reflective film, or a glass film having a reflective film formed on both surfaces And a method of laminating a glass film having a reflective film formed on one surface and a glass film having no reflective film in an appropriate combination so that the glass film and the reflective film are alternately arranged. It may be adopted.

  The glass laminate of the present invention is formed by laminating at least one glass film in a state in which the drawing direction is perpendicular to other glass films. The glass laminate of the present invention may be laminated so that the drawing direction is different, for example, every plurality or every random number, but ideally all adjacent glass films are drawn together. It is desirable that the layers are laminated so that the directions are orthogonal to each other. In the glass laminate, the ratio of a group of glass films having the same drawing direction to another group of glass films having a different drawing direction is 1: 3 to 3: 1, particularly 1: 2. It is preferably ˜2: 1. As this number ratio is closer to 1: 1, it becomes easier to laminate all the glass films in parallel with each other, and the uniformity of the spacing between the reflecting surfaces can be improved.

  As a method of laminating at least one glass film so that the drawing direction is orthogonal to other glass films, when laminating glass films with a reflective film taken out from the same lot, for example, every predetermined number of sheets The glass film may be laminated by rotating the direction of the glass film by 90 °. Moreover, it is also possible to employ a method in which lots having different drawing directions are used in combination, and the glass films with reflection films of each lot are alternately used for lamination.

  In the glass laminate of the present invention, the number of laminated glass films is preferably 100 or more, 200 or more, 300 or more, 400 or more, 500 or more, 600 or more, particularly 700 or more. The larger the number of glass film layers, the easier it is to produce a large optical imaging member. Further, the number of layers of the reflective film disposed between the glass films is substantially the same as the number of laminated glass films. If both outermost layers of the laminate are made to be reflective films, the number of layers of the reflective film is one more than the number of layers of the glass film, and conversely, both outermost layers of the laminate are made to be glass films. For example, the number of layers of the reflective film is one less than the number of layers of the glass film.

  In the glass laminate of the present invention, it is preferable that glass films with a reflective film or glass films with a reflective film and a glass film without a reflective film are laminated and integrated with an adhesive. That is, the glass laminate preferably has an adhesive layer for stacking integration. If it does in this way, glass films with a reflecting film or a glass film with a reflecting film and a glass film can be firmly laminated and integrated. Further, the thickness of the adhesive layer is preferably 100 μm or less, 70 μm or less, 50 μm or less, 40 μm or less, particularly 30 μm or less. If it does in this way, it will become easy to narrow the space | interval of a reflecting film. Although various materials can be used as the adhesive, transparent adhesives such as OCA and cemedine are preferred.

  The refractive index nd of the adhesive layer is preferably matched with the refractive index of the glass film in the glass laminate. The refractive index nd difference between the glass film and the adhesive layer is preferably 0.2 or less, 0.15 or less, 0.12 or less, 0.1 or less, 0.08 or less, 0.05 or less, 0.02 or less, 0 .01 or less, 0.008 or less, and particularly 0.005 or less. Thereby, the diffuse reflection at the interface between the glass laminate and the adhesive layer can be reduced without polishing the surface of the glass laminate on the adhesive layer side. As a result, the manufacturing cost of the optical imaging member can be significantly reduced. The refractive index nd can be measured with a precision refractometer.

  As an adhesive constituting the adhesive layer, EVA resin (ethylene-vinyl acetate copolymer resin) is preferable. The adhesive layer is preferably formed by applying an adhesive after forming a reflective film on the surface of the glass film. The thickness of the adhesive layer is preferably 0.5 mm or less, 0.4 mm or less, 0.3 mm or less, 0.2 mm or less, 0.1 mm or less, 0.05 mm or less, particularly 0.03 mm or less. This makes it easy to obtain high resolution imaging.

  In forming an adhesive layer such as an EVA resin layer, heating is preferably performed, and the heating temperature is preferably 50 ° C. or higher, 70 ° C. or higher, 90 ° C. or higher, 100 ° C. or higher, particularly 110 to 250 ° C. Thereby, the formation time of the EVA resin layer can be shortened. The heating pressure is preferably 700 torr or less, 70 torr or less, 10 torr or less, 1 torr or less, 0.1 torr or less, particularly 0.01 torr or less. Thereby, foaming at the interface of the EVA adhesive layer can be suppressed.

  As a method for integrating the glass laminate, a method for producing a glass laminate without providing an adhesive layer may be employed. For example, a method in which heat treatment is performed in a state where glass films or the like are superposed is conceivable. This method eliminates the need for an adhesive layer, so that it is easy to reduce the interval between the reflective films. If adjacent surfaces are smooth, stacking and integration can be performed at a low temperature (about 250 ° C.).

  The glass laminate is preferably strip-shaped. As a method for producing a strip-shaped glass laminate, it is preferable to employ a method of cutting, for example, from a larger glass laminate (glass laminate base material) in a direction perpendicular to the reflective film surface. According to this method, a large number of strip-shaped glass laminates can be produced efficiently. Although various methods can be used as the cutting method, it is preferable to adopt a method of cutting using a wire from the viewpoint of workability. For example, a wire having a diameter of about 100 μm is mixed with abrasive grains and cut. Is preferred. In addition, although a pair of strip glass laminated body required for preparation of an optical image formation member may be extract | collected from the same glass laminated body base material, it does not interfere even if it produces from a different glass laminated body base material, respectively.

  The optical imaging member of the present invention is an optical imaging member comprising a pair of glass laminates, each of the pair of glass laminates being the above glass laminate, and the pair of glass laminates being one The reflective film surface of the glass laminate and the reflective film surface of the other glass laminate are arranged so as to be orthogonal to each other. Here, the glass laminate constituting the optical imaging member is preferably a strip-like glass laminate. In the optical imaging member having such a configuration, the outer surface of one glass laminate is a light incident surface, and the outer surface of the other glass laminate is a light exit surface. Light incident from the incident surface is reflected by the reflecting film provided on the glass laminate on the incident surface side to change the traveling direction, and then enters and reflects in the glass laminate on the exit surface side to further change the traveling direction. . In addition, since the optical imaging member of the present invention has a two-surface orthogonal reflector structure in which the glass laminates are arranged in an orthogonal state, the reflection angles of the first incident angle and the second outgoing angle are respectively. Will be equal. For this reason, the image on the incident surface side can be formed in the space on the exit surface side with the optical coupling member of the present invention as the target axis.

  The pair of glass laminates constituting the optical imaging member is preferably bonded and fixed with an adhesive. That is, it is preferable to have an adhesive layer between the glass laminates. In this way, the pair of glass laminates can be firmly bonded and fixed. Further, the thickness of the adhesive layer is preferably 100 μm or less, 70 μm or less, 50 μm or less, 40 μm or less, particularly 30 μm or less in order to minimize the optical influence. In addition, although various materials can be used as the adhesive, a transparent adhesive such as OCA is preferable.

  It is preferable that a glass plate is further disposed on the outer surface of the glass laminate that becomes the incident surface or the exit surface, and the glass plate and the glass laminate are preferably bonded and fixed by an adhesive layer. Specifically, it is preferable that the glass plate, the adhesive layer, the glass laminate, the adhesive layer, the glass laminate, the adhesive layer, and the glass plate are laminated in this order. In this way, it is not necessary to polish the outer surface of the glass laminate with high accuracy, and the manufacturing cost of the optical imaging member can be greatly reduced. In particular, when the glass laminate is produced by cutting out from the glass laminate base material, the outer side surface of the glass laminate becomes a cut surface, so that the effect of reducing the manufacturing cost becomes very large.

  The surface roughness Ra of the outer surface of the glass laminate is preferably 0.01 μm or more, 0.05 μm or more, 0.1 μm or more, 0.2 μm or more, 0.4 μm or more, particularly 0.7 μm or more, preferably 3 μm or less, 2 μm or less, 1.5 μm or less, 1.2 μm or less, particularly 1 μm or less. If the surface roughness Ra of the surfaces of the pair of glass laminates is too small, the necessity for polishing the surfaces increases, and as a result, the manufacturing cost of the optical imaging member may increase. On the other hand, if the surface roughness Ra of the surface of the pair of glass laminates is too large, air is easily mixed into the adhesive layer.

  The refractive index nd of the adhesive layer is preferably matched with the refractive index of the glass plate. The refractive index nd difference between the glass plate and the adhesive layer is preferably 0.2 or less, 0.15 or less, 0.12 or less, 0.1 or less, 0.08 or less, 0.05 or less, 0.02 or less, 0 .01 or less, 0.008 or less, and particularly 0.005 or less. Thereby, diffuse reflection at the interface between the glass plate and the adhesive layer can be reduced.

  The refractive index nd of the adhesive layer is preferably 1.60 or less, 1.55 or less, 1.54 or less, 1.52 or less, 1.51 or less, particularly 1.50 or less, preferably 1.45 or more, 1.48 or more, particularly 1.49 or more. Thereby, it becomes easy to match the refractive index of a glass film or a glass plate, and diffuse reflection at the interface of the adhesive layer can be suppressed.

  The surface roughness Ra of the glass plate is preferably 1.0 nm or less, 0.8 nm or less, 0.6 nm or less, 0.5 nm or less, 0.4 nm or less, 0.3 nm or less, 0.2 nm or less, particularly 0.1 nm. The following is preferred. If it does in this way, the mechanical strength of an optical coupling member can be raised.

  It is preferable that the glass plate is shape | molded by the overflow downdraw method. If it does in this way, the surface accuracy of a glass plate will improve and it will become possible to omit the grinding process of a glass plate.

  The glass plate is preferably made of tempered glass having a compressive stress layer on the surface. In this case, the compressive stress value of the compressive stress layer is preferably 200 MPa or more, 400 MPa or more, 600 MPa or more, particularly 800 MPa or more, and the stress depth is preferably 10 μm or more, 20 μm or more, 30 μm or more, particularly 40 μm or more. . In this way, the mechanical strength of the optical imaging member can be increased.

  The glass plate preferably has an antireflection layer (antireflection film) on the outermost layer side (opposite side of the glass laminate). Thereby, reflection on the surface on the outermost layer side is suppressed, and it becomes easy to obtain high-resolution imaging.

  The glass film of the present invention is characterized in that the aspect ratio (L / W) is 1.3 or less. Moreover, it is preferable that thickness is 3000 micrometers or less. The preferred aspect ratio, thickness and other technical features of the glass film of the present invention are as described above, and detailed description thereof is omitted here.

  The manufacturing method of the glass laminated body of this invention is demonstrated.

  First, a glass film with a reflective film is laminated so that the reflective film and the glass film are alternately laminated. When laminating, the glass film with a reflective film is disposed so that at least one glass film is perpendicular to the other glass film in the drawing direction. The glass film used here preferably has a thickness of 3000 μm or less and an aspect ratio of 1.3 or less. The details of the method of laminating the glass with a reflective film are as described above, and the description thereof is omitted here. Similarly, the preferred aspect ratio, thickness and other technical features of the glass film to be used are as described above, and detailed description thereof is omitted here.

  Further, it is preferable to cut the glass laminate into a strip shape by cutting in a direction perpendicular to the reflective film surface.

  Thus, the glass laminated body of this invention can be obtained.

  A method for manufacturing the optical imaging member of the present invention will be described.

  First, a pair of glass laminates prepared by the above-described method is prepared.

  Subsequently, the glass laminates are arranged so that the reflection film surface of one glass laminate and the reflection film surface of the other glass laminate are orthogonal to each other, and adhesion fixing or the like is performed. The method of joining the glass laminates is as described, and the description is omitted here.

  Further, a glass plate may be bonded and fixed to the outer surface of the glass laminate.

  In this manner, the optical imaging member of the present invention can be obtained.

  Next, an example of the glass laminate and the optical imaging member of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual perspective view showing an example of the glass laminate 1 of the present invention. In the glass laminate 1, glass films 10 and reflection films 11 are alternately laminated and integrated. The thickness of the glass film 10 is 3000 micrometers or less. Here, the glass films with reflective films are laminated and integrated by an adhesive layer (not shown). In the drawing, the thickness of the reflective film 11 is exaggerated.

  This glass laminate is produced by laminating and integrating a glass film with a reflective film in which a reflective film 11 is formed on one side of the glass film 10 so that the glass films 10 and the reflective films 11 are alternately arranged. When the glass film with a reflective film is laminated and integrated, as shown in FIG. 2, the drawing direction A of at least one glass film 10a is in a state orthogonal to the drawing direction B of the other glass film 10b. Laminate as follows. In FIG. 2, the reflective film is omitted.

  FIG. 3 is a conceptual perspective view showing an example of the glass laminate 2 of the present invention. The glass laminate 1 shown in FIG. 1 is cut in a direction perpendicular to the surface on which the reflective film is formed, and is formed into a strip shape. This is a glass laminate 2. The cutting width is appropriately determined from the dimensions of the optical imaging member. If it does in this way, the strip-shaped glass laminated body 2 can be produced efficiently.

  FIG. 4 is a conceptual perspective view showing an example of the optical imaging member 3 of the present invention. The optical imaging member 3 uses a pair of strip-like glass laminates 2 shown in FIG. 3, and the pair of strip-like glass laminates 2 are formed so that the surfaces on which the reflection films 13 are formed are orthogonal to each other. The side surfaces (cut surfaces) of the glass laminate 2 are bonded and fixed by an adhesive layer (not shown). The refractive index of the adhesive layer is consistent with the glass film 12. In the optical imaging member 3, the interval between the reflection films 13 is narrowed and made uniform by the glass film 12.

  FIG. 5 is a conceptual perspective view showing an example of the optical imaging member 4 of the present invention. The optical imaging member 4 uses a pair of strip-like glass laminates 2 shown in FIG. 3, and the pair of glass laminates 2 is a reflection film surface of one glass laminate and a reflection of the other glass laminate. The side surfaces (cut surfaces) of the glass laminate 2 are bonded and fixed by an adhesive layer (not shown) so that the film surfaces are orthogonal to each other. In the optical imaging member 4, the interval between the reflective films 14 is narrowed and made uniform by the glass film 15. Glass plates 16 are respectively disposed on the surface of the glass laminate 2 on the incident surface side or the emission surface side, and are bonded and fixed by an adhesive layer (not shown). Here, the refractive index of the adhesive layer matches the refractive index of the glass film 15 and the glass plate 16.

  Below, the suitable example of the glass film used by this invention is demonstrated. However, the following examples are merely illustrative. The glass film used by this invention is not limited to the following examples at all.

  Table 1 shows the glass composition and characteristics of the glass film (Sample Nos. 1 to 7).

First, glass raw materials were prepared so as to have the glass composition shown in Table 1, and the obtained glass raw materials were supplied to a glass melting furnace and melted at 1500 to 1600 ° C. Next, the obtained molten glass was molded by the overflow down draw method so as to have the thickness in the table and the width dimension of 1500 mm. Subsequently, the glass film immediately after molding was moved to the slow cooling area. At that time, the temperature of the slow cooling area and the film drawing speed were adjusted so that the cooling rate at a temperature of 10 ¹² to 10 ¹⁴ dPa · s was 20 ° C./min.

  The density is a value measured by a well-known Archimedes method.

  The strain point is a value measured based on the method of ASTM C336-71.

  The glass transition temperature is a value measured from the thermal expansion curve based on the method of JIS R3103-3.

  The softening point is a value measured based on the method of ASTM C338-93.

The temperature at 10 ^4.0 , 10 ^3.0 , 10 ^2.5 dPa · s is a value measured by a platinum ball pulling method. The lower the temperature, the better the meltability.

  The Young's modulus is a value measured by a resonance method.

  The thermal expansion coefficient is obtained by measuring an average thermal expansion coefficient at 30 to 380 ° C. using a dilatometer. As a sample for measuring the coefficient of thermal expansion, a cylindrical sample of φ5 mm × 20 mm whose end face was subjected to R processing was used.

  The liquid phase temperature passed through a standard sieve 30 mesh (500 μm), the glass powder remaining in 50 mesh (300 μm) was placed in a platinum boat and held in a temperature gradient furnace for 24 hours, and the temperature at which crystals were precipitated was measured. Is. The liquid phase viscosity is a value obtained by measuring the viscosity of glass at the liquid phase temperature by a platinum ball pulling method.

  HCl resistance and BHF resistance were evaluated by the following methods. First, after optically polishing both surfaces of each sample, a part of the surface was masked. Next, it was immersed in a chemical solution prepared to a predetermined concentration at a predetermined temperature for a predetermined time. Then, the mask was removed, the level difference between the mask portion and the erosion portion was measured with a surface roughness meter, and the value was taken as the erosion amount. Further, both surfaces of each sample were optically polished, and then immersed in a chemical solution prepared to a predetermined concentration at a predetermined temperature for a predetermined time. Thereafter, the surface of the sample was visually observed and evaluated as “X” when the surface became cloudy, rough, or cracked, and “◯” when there was no change.

Here, the amount of erosion of BHF resistance was measured using a 130 BHF solution (NH ₄ HF: 4.6 mass%, NH ₄ F: 36 mass%) at 20 ° C. for 30 minutes. Appearance evaluation was performed using a 63BHF solution (HF: 6% by mass, NH ₄ F: 30% by mass) under treatment conditions at 20 ° C. for 30 minutes. Further, the erosion resistance of HCl resistance was measured using a 10% by mass hydrochloric acid aqueous solution at 80 ° C. for 24 hours. Appearance evaluation was performed under a treatment condition of 80 ° C. for 3 hours using a 10 mass% hydrochloric acid aqueous solution.

  The crack occurrence rate was determined by placing a Vickers indenter set at a load of 1000 g on the sample surface (optical polishing surface) for 15 seconds in a constant temperature and humidity chamber maintained at a humidity of 30% and a temperature of 25 ° C. The number of cracks generated from the corner is counted (maximum 4 per indentation). The indenter was driven 20 times, and the total number of cracks generated / 80 × 100 was evaluated.

  The surface roughness Ra of the surface is a value measured by a method based on JIS B0601: 2001.

  The surface roughness Ra of the end face is a value measured by a method based on JIS B0601: 2001.

  The waviness is a value obtained by measuring the WCA (filtered center line waviness) described in JIS B0601: 2001 using a stylus type surface shape measuring device. This measurement is based on SEMI STD D15-1296 “FPD glass plate”. The measurement was performed by a method based on “Measurement method of surface waviness”, and the cut-off at the time of measurement was 0.8 to 8 mm, which was a value measured at a length of 300 mm in a direction perpendicular to the drawing direction of the glass film.

  The difference between the maximum thickness and the minimum thickness of the glass film is determined by measuring the maximum thickness and the minimum thickness of the glass film by scanning a laser from one side of the glass film in the thickness direction using a laser thickness measuring device. The value obtained by subtracting the value of the minimum thickness from the value of the maximum thickness.

  The refractive index nd is a value measured using a precision refractometer (KPR-2000 manufactured by Shimadzu Corporation).

  As is clear from Table 1, sample No. 1-7 have a small thickness and good surface accuracy. Therefore, sample no. If a reflective film is formed on the surfaces of 1 to 7 and then laminated and integrated, a glass laminate can be produced without causing an increase in cost. In each sample, uneven thickness (thickness distribution) occurred in a direction perpendicular to the drawing direction, and a streaky thick portion was observed along the drawing direction. For this reason, when laminating and integrating the glass films, if at least one glass film is laminated so that the drawing direction of the other glass films is orthogonal, the spacing between the reflecting surfaces can be made uniform. It becomes possible. And if a pair of obtained glass laminated body is arrange | positioned so that the reflective film surface of one glass laminated body and the reflective film surface of the other glass laminated body may mutually orthogonally cross, it can form an image with high resolution. An optical imaging member can be obtained.

  Sample No. About 1-6, the transmittance | permeability was measured with the thickness and wavelength in a table | surface. As a measuring apparatus, UV-3100PC was used, and measurement was performed under the conditions of slit width: 2.0 nm, scan speed: medium speed, and sampling pitch: 0.5 nm. The results are shown in Table 2.

  As apparent from Table 2, the sample No. Nos. 1 to 6 had high transmittance at any thickness and wavelength.

  Furthermore, about each sample, Haze was measured with the Haze meter (Nippon Denka Kogyo Co., Ltd. Haze Meter NDH-5000). The results are shown in Table 2. As apparent from Table 2, the sample No. Since all of Nos. 1 to 6 have a small haze, diffuse reflection on the surface can be suppressed.

First, sample no. A glass film having a glass composition of 2 was prepared. The glass film has a thickness of 0.25 mm and a refractive index nd of 1.50. Next, after sequentially forming an Al film and an SiO ₂ film on one surface of the glass film, 1600 sheets of the obtained glass film with a reflective film are arranged so that the glass film and the reflective film are alternately arranged. , LOCITE 454 (manufactured by Henkel Japan KK) was laminated and integrated to obtain a glass laminate. In addition, when producing a glass laminated body, the glass film with a reflecting film taken out from the same lot was laminated | stacked by rotating 90 degrees for every sheet.

Subsequently, using a multi-wire saw (abrasive grain # 600), after cutting the glass laminate in the thickness direction of the glass film (direction perpendicular to the reflective film surface), washing is performed to remove the abrasive grains, A pair of strip-shaped glass laminates (400 mm × 400 mm × 0.75 mm) was obtained. When the surface roughness of the cut surface of the strip-shaped glass laminate was measured, Ra was 0.7 μm, Rq was 0.89 μm, and Rsm was 63 μm. Furthermore, after UV-curing resin (Loctite 3301 manufactured by Henkel Japan Co., Ltd.) is dropped on the cut surface of the strip-shaped glass laminate, the reflective film surface of one strip-shaped glass laminate and the reflective film surface of the other strip-shaped glass laminate A pair of strip glass laminates were bonded and fixed by irradiating with a 365 nm UV lamp (30 mW / cm ² ) for 100 seconds from above. Sample No. Two glass plates having a glass composition of 2 were prepared. The glass plate has a thickness of 0.3 mm and is formed by the overflow down draw method.

  Finally, a glass plate is disposed on each of the outer surfaces (incident surface side and outgoing surface side) of the pair of strip-shaped glass laminates, and bonded and fixed with the same UV curable resin as described above to obtain an optical imaging member. It was.

DESCRIPTION OF SYMBOLS 1 Glass laminated body 2 Strip-shaped glass laminated body 3 Optical imaging member 4 Optical imaging member 10 with a glass plate Glass film 10a Glass film 10b Glass film 11 Reflective film 12 Glass film 13 Reflective film 14 Reflective film 15 Glass film 16 Glass plate

Claims (14)

  A glass laminate for an optical imaging member in which a glass film and a reflective film are alternately laminated, wherein the glass film is prepared by drawing a molten glass, and the glass laminate is at least 1 A glass laminate for an optical imaging member, characterized in that a sheet of glass film is laminated in a state in which the drawing direction is orthogonal to other glass films.   The glass laminate for an optical imaging member according to claim 1, wherein the glass laminate is in a strip shape.   The glass laminate for an optical imaging member according to claim 1 or 2, wherein the glass film has a thickness of 3000 µm or less.   A pair of glass laminated body as described in any one of Claims 1-3 is arrange | positioned so that the reflective film surface of one glass laminated body and the reflective film surface of the other glass laminated body may mutually orthogonally cross An optical imaging member. A method for producing a glass laminate for an optical imaging member in which a glass film with a reflective film is laminated so that the reflective film and the glass film are alternately laminated,
The glass film is made by drawing a molten glass, and at least one glass film is laminated with a glass film with a reflective film so that the drawing direction is perpendicular to other glass films. A method for producing a glass laminate for an optical imaging member.   6. The glass laminate for an optical imaging member according to claim 5, wherein after laminating the glass film with a reflective film, the glass film is further cut into a rectangular glass laminate in a direction perpendicular to the reflective film surface. Production method.   The method for producing a glass laminate for an optical imaging member according to claim 5 or 6, wherein a glass laminate is produced using a glass film having a thickness of 3000 µm or less.   The method for producing a glass laminate for an optical imaging member according to any one of claims 5 to 7, wherein a glass laminate is produced using a glass film having an aspect ratio of 1.3 or less.   A glass laminate for an optical imaging member produced by the method according to claim 5.   A pair of glass laminates according to any one of claims 1 to 3, wherein the glass laminates are arranged so that the reflective film surface of one glass laminate and the reflective film surface of the other glass laminate are orthogonal to each other. Arranging to obtain an optical imaging member, and a method for producing an optical imaging member.   A pair of glass laminates produced by the method according to any one of claims 5 to 8 are arranged so that the reflection film surface of one glass laminate and the reflection film surface of the other glass laminate are orthogonal to each other. And a step of obtaining an optical imaging member.   An optical imaging member produced by the method according to claim 10 or 11.   It is a glass film used for the glass laminated body for optical coupling members, Comprising: The aspect ratio of a glass film is 1.3 or less, The glass film characterized by the above-mentioned. The glass film according to claim 13, wherein the glass film has a thickness of 3000 μm or less.