JP7054066B2 - Glass plate with optical film and its manufacturing method - Google Patents

Description

The present invention relates to a glass plate with an optical film and a method for manufacturing the same.

Since the spectral sensitivity of solid-state image sensors such as CCDs and CMOS used in digital still cameras and video cameras has strong sensitivity to light in the near-infrared region, the spectral sensitivity of these solid-state image sensors is the human luminosity factor. Generally, a visibility correction member is used to match the characteristics.

As the visibility correction member, for example, as disclosed in Patent Document 1, a glass plate with an optical film having an optical film having an infrared shielding function formed on the main surface of the glass plate is used. Further, in order to prevent reflection on the surface of the glass plate, an optical film having an antireflection function may be formed.

International Publication No. 2013/07737

By the way, along with the miniaturization of the solid-state image sensor, the miniaturization of the glass plate with an optical film used is also being promoted. Therefore, in order to effectively utilize the limited area, the glass plate with an optical film is often required to have uniform optical characteristics up to the vicinity of the edge of the main surface of the glass plate.

However, a glass plate with an optical film is usually manufactured by forming an optical film on the main surface of the original glass plate of a large plate and then cutting it to a predetermined size with a dicing device, and the edge of the main surface of the glass plate. The film peeling of the optical film due to cutting is likely to occur in the vicinity of the portion. If the optical film is not formed near the end of the main surface of the glass plate due to such film peeling, the required optical characteristics cannot be sufficiently realized, and the performance of the glass plate with the optical film deteriorates. There is a risk.

An object of the present invention is to provide a glass plate with an optical film in which an optical film is surely formed in the vicinity of an end portion of a main surface of the glass plate.

The present invention, which was devised to solve the above problems, is formed on a glass plate having a pair of front and back main surfaces and an end surface connecting the ends of each of the pair of main surfaces, and at least one main surface of the glass plate. The glass plate with an optical film provided with the optical film is characterized in that the optical film has a protrusion portion that protrudes outward beyond the end portion of the main surface of the glass plate. According to such a configuration, the optical film is formed in a wider range than the main surface of the glass plate by the protruding portion, so that the optical film is surely formed in the vicinity of the end portion of the main surface of the glass plate. It is formed. Since the protruding portion is in a state of protruding outward, it becomes difficult for other members to come into direct contact with the end surface of the glass plate. Therefore, the effect of reducing dust generation and breakage from the end face of the glass plate can be expected.

In the above configuration, the end face of the glass plate may be chamfered, and the end face may have a portion located outside the protruding portion of the optical film.

In the above configuration, the optical film is preferably at least one of an antireflection film, an infrared shielding film, an ultraviolet shielding film, an ultraviolet ray and an infrared shielding film. In this case, as the optical film, for example, a dielectric multilayer film formed by alternately laminating high refractive index layers and low refractive index layers can be used.

In the above configuration, it is preferable that the glass plate contains 25% or more of P ₂ O ₅ in mass% by mass.

In the above configuration, it is preferable that the protrusion dimension of the protrusion portion of the optical film is 1 μm to 0.1 mm.

The present invention, which was devised to solve the above problems, is formed on a glass plate having a pair of front and back main surfaces and an end surface connecting the ends of each of the pair of main surfaces, and at least one main surface of the glass plate. It is a method of manufacturing a glass plate with an optical film provided with an optical film, in which a film forming step of forming an optical film on at least one main surface of the glass plate and at least an end face of the glass plate on which the optical film is formed are formed. The glass plate is made of phosphate-based glass, and the etching solution is an alkaline detergent. According to such a configuration, in the etching step, only the glass plate reacts with the etching solution, and the optical film does not react with the etching solution. As a result, focusing on the end portion of the glass plate, only the end portion of the glass plate is removed by the etching solution, and the optical film remains in a state of protruding outward beyond the end portion of the main surface of the glass plate. Therefore, since the optical film is formed in a wider range than the main surface of the glass plate by this protruding portion, the optical film is surely formed in the vicinity of the end portion of the main surface of the glass plate.

In the above configuration, it is preferable that the etching solution contains an alkaline salt of a chelating agent as an alkaline component, and the glass plate on which the optical film is formed is immersed in the etching solution in the etching step.

In the above configuration, it is preferable to further include a cutting step of cutting the glass plate and a chamfering step of chamfering the end face of the glass plate after the film forming step and before the etching step.

In this case, the cutting step may also serve as the chamfering step, and the chamfering may be performed at the same time as cutting the glass plate.

In the above configuration, the optical film may be formed only on one main surface of the glass plate.

In the above configuration, the optical film may be formed on both main surfaces of the glass plate.

According to the present invention, it is possible to provide a glass plate with an optical film in which an optical film is surely formed in the vicinity of the end portion of the main surface of the glass plate.

It is sectional drawing which shows the glass plate with an optical film which concerns on 1st Embodiment. It is a top view which shows the glass plate with an optical film which concerns on 1st Embodiment. It is sectional drawing which shows the film formation process included in the manufacturing method of the glass plate with an optical film which concerns on 1st Embodiment. It is a top view which shows the cutting process included in the manufacturing method of the glass plate with an optical film which concerns on 1st Embodiment. It is sectional drawing which shows the etching process included in the manufacturing method of the glass plate with an optical film which concerns on 1st Embodiment. It is sectional drawing which shows the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the state of the early stage of the cutting process which also serves as a chamfering process, which is included in the manufacturing method of the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the state of the middle part of the cutting process which also serves as a chamfering process, which is included in the manufacturing method of the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the state of the final stage of the cutting process which also serves as a chamfering process, which is included in the manufacturing method of the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the modification of the chamfering process included in the manufacturing method of the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the etching process included in the manufacturing method of the glass plate with an optical film which concerns on 2nd Embodiment. It is sectional drawing which shows the glass plate with an optical film which concerns on 3rd Embodiment. It is sectional drawing which shows the film formation process included in the manufacturing method of the glass plate with an optical film which concerns on 3rd Embodiment. It is sectional drawing which shows the etching process included in the manufacturing method of the glass plate with an optical film which concerns on 3rd Embodiment.

Hereinafter, a glass plate with an optical film and a method for manufacturing the same according to the present embodiment will be described with reference to the drawings.

(First Embodiment)
As shown in FIGS. 1 and 2, the glass plate 1 with an optical film according to the first embodiment includes a glass plate 2 and an optical film 3, and is used, for example, as a visibility correction member or a cover glass of a solid-state image sensor. It will be used.

The glass plate 2 includes a pair of front and back main surfaces 2a and an end surface 2b connecting the ends of both main surfaces 2a. The glass plate 2 is formed in a quadrangular shape, but is not limited to this shape, and may be, for example, a triangle, a polygon having a pentagon or more, or a circle. In the present embodiment, the end face 2b is formed so as to be substantially orthogonal to the main surface 2a on each side of the rectangular glass plate 2.

The thickness of the glass plate 2 is preferably 0.4 mm or less, 0.3 mm or less, and 0.2 mm or less. It is more preferably 0.19 mm or less, still more preferably 0.15 mm or less, and particularly preferably 0.12 mm or less. On the other hand, the thickness of the glass plate 2 is preferably 0.05 mm or more, more preferably 0.08 mm or more.

The area of each main surface 2a on the glass plate 2 can be 1 mm ² or more and 25000 mm ² or less. The preferred range of the area of each main surface 2a is 3 mm ² or more and 25000 mm ² or less, more preferably 9 mm ² or more and 25000 mm ² or less, further preferably 15 mm ² or more and 25000 mm ² or less, and particularly preferably 20 mm ² or more and 25000 mm ² or less.

The surface roughness Ra of the end surface 2b of the glass plate 2 is preferably 0.1 nm to 10 nm.

The glass plate 2 is represented by cation% as a composition, P ⁵⁺ 5 to 50%, Al ³⁺ 2 to 30%, R' ⁺ (R'is at least one selected from Li, Na and K) 10 to 50% and R ²⁺ (R ²⁺ is at least one selected from Mg ²⁺ , Ca ²⁺ , Sr ²⁺ , Ba ²⁺ and Zn ²⁺ ) 20-50%, Cu ²⁺ 0. It contains 5 to 15% and F ^- 5 to 80% and O2 to 20 to 95% in ^terms of anion%.

In addition to the above composition, the glass plate 2 may have a composition containing F ^- 5 to 80% in terms of anion%.

The glass plate 2 is more preferably composed of P ⁵⁺ 40 to 50%, Al ³⁺ 7 to 12%, K ⁺ 15 to 25%, Mg ²⁺ 3 to 12%, Ca ² in terms of cation%. Phosphate containing ⁺ 3 to 6%, Ba ²⁺ 7 to 12%, Cu ²⁺ 1 to 15%, and F ^- 5 to 80% and O ² to 20 to 95% in terms of anion%. Glass can be used.

Glass plates 2 having other preferable compositions include P ⁵⁺ 20 to 35%, Al ³⁺ 10 to 20%, Li ⁺ 20 to 30%, Na ⁺ 0 to 10%, and Mg ²⁺ 1 in terms of cation%. ~ 8%, Ca ²⁺ 3 ~ 13%, Sr ²⁺ 2 ~ 12%, Ba ²⁺ 2 ~ 8%, Zn ²⁺ 0 ~ 5%, Cu ²⁺ 0.5 ~ 5% and anion% display Therefore, borosilicate glass containing F ^- 30 to 65% and ^O2-35 to 75% can be used.

Glass plates 2 having other preferable compositions include P ⁵⁺ 35 to 45%, Al ³⁺ 8 to 12%, Li ⁺ 20 to 30%, Mg ²⁺ 1 to 5%, and Ca ²⁺ in terms of cation%. Borosilicate glass containing 3 to 6%, Ba ²⁺ 4 to 8%, Cu ²⁺ 1 to 6%, and F ^- 10 to 20% and O ^2-75 to 95% in terms of anion%. Can be used.

As the glass plate 2 having another preferable composition, P ⁵⁺ 30 to 45%, Al ³⁺ 15 to 25%, Li ⁺ 1 to 5%, Na ⁺ 7 to 13%, K ⁺ 0. 1 to 5%, Mg ²⁺ 1 to 8%, Ca ²⁺ 3 to 13%, Ba ²⁺ 6 to 12%, Zn ²⁺ 0 to 7%, Cu ²⁺ 1 to 5%, and anion% display , F ^- 30 to 45%, and O ^2-50 to 70% can be used.

The following shows an example in which the glass plate 2 is a phosphate-based glass having an excellent infrared absorbing function.

It is desirable that the phosphate-based glass used for the glass plate 2 does not substantially contain F (fluorine). Here, "substantially free" means that fluorine may be contained in an amount of 0.1% or less in mass%.

As such a phosphate-based glass, for example, one containing 25% by mass or more of P ₂ O ₅ can be used. Specifically, in terms of mass%, P ₂ O ₅ 25 to 60%, Al ₂ O ₃ 2 to 19%, RO (where R is at least one selected from Mg, Ca, Sr and Ba) 5 to 45. %, ZnO 0-13%, K _2O 8-20%, Na _2O 0-12%, and CuO 0.3-20%, and substantially free of fluorine, glass can be used. can.

P ₂ O ₅ is a component that forms a glass skeleton. The content of P ₂ O ₅ is mass%, preferably 25 to 60%, more preferably 30 to 55%, still more preferably 40 to 50%. If the content of P ₂ O ₅ is too low, vitrification may become unstable. On the other hand, if the content of P ₂ O ₅ is too large, the weather resistance may easily decrease.

Al ₂ O ₃ is a component that further improves weather resistance. The content of A1 ₂ O ₃ is mass%, preferably 2 to 19%, more preferably 2 to 15%, still more preferably 2.8 to 14.5%, and particularly preferably 3. It is 5.5 to 14.0%. If the content of Al ₂ O ₃ is too low, the weather resistance may not be sufficient. On the other hand, if the content of Al ₂ O ₃ is too large, the meltability may decrease and the melting temperature may rise. When the melting temperature rises, Cu ions are reduced and it becomes easy to shift from Cu ²⁺ to Cu ⁺ , so that it may be difficult to obtain desired optical characteristics. Specifically, the light transmittance in the near-ultraviolet to visible region may decrease, or the infrared absorption characteristic may easily decrease.

RO (where R is at least one selected from Mg, Ca, Sr and Ba) is a component that improves weather resistance and meltability. The content of RO is mass%, preferably 5 to 45%, more preferably 7 to 40%, still more preferably 10 to 35%. If the RO content is too low, the weather resistance and meltability may not be sufficient. On the other hand, if the RO content is too high, the stability of the glass tends to decrease, and crystals derived from the RO component may easily precipitate.

The preferred range of the content of each component of RO is as follows.

MgO is a component that improves weather resistance. The content of MgO is mass%, preferably 0 to 15%, and more preferably 0 to 7%. If the MgO content is too high, the stability of the glass may easily decrease.

CaO is a component that improves weather resistance like MgO. The content of CaO is mass%, preferably 0 to 15%, and more preferably 0 to 7%. If the CaO content is too high, the stability of the glass may easily decrease.

SrO is a component that improves weather resistance like MgO. The content of SrO is mass%, preferably 0 to 12%, and more preferably 0 to 5%. If the content of SrO is too high, the stability of the glass may easily decrease.

BaO is a component that stabilizes glass and improves weather resistance. The content of BaO is mass%, preferably 1 to 30%, more preferably 2 to 27%, still more preferably 3 to 25%. If the BaO content is too low, the glass may not be sufficiently stabilized or the weather resistance may not be sufficiently improved. On the other hand, if the BaO content is too high, crystals due to BaO may easily precipitate during molding.

ZnO is a component that improves the stability and weather resistance of glass. The ZnO content is mass%, preferably 0 to 13%, more preferably 0 to 12%, and even more preferably 0 to 10%. If the ZnO content is too high, the meltability may decrease and the melting temperature may rise, and as a result, it may be difficult to obtain desired optical characteristics. In addition, the stability of the glass may decrease, and crystals due to the ZnO component may easily precipitate.

As described above, RO and ZnO have the effect of improving the stabilization of the glass, and it is easy to enjoy the effect especially when the amount of P ₂ O ₅ is small.

The ratio of the content of P ₂ O ₅ to RO (P ₂ O ₅ / RO) is preferably 1.0 to 1.9, and more preferably 1.2 to 1.8. If the ratio (P ₂ O ₅ / RO) is too small, the liquidus temperature may rise and devitrification due to RO may easily precipitate. On the other hand, if P ₂ O ₅ / RO is too large, the weather resistance may easily decrease.

K ₂ O is a component that lowers the melting temperature. The content of K ₂ O is mass%, preferably 8 to 20%, and more preferably 12.5 to 19.5%. If the K ₂ O content is too low, the melting temperature may rise and it may be difficult to obtain the desired optical characteristics. On the other hand, if the content of K ₂ O is too large, crystals derived from K ₂ O are likely to precipitate during molding, and vitrification may become unstable.

Like K ₂ O, Na ₂ O is also a component that lowers the melting temperature. The content of Na ₂ O is mass%, preferably 0 to 12%, and more preferably 0 to 7%. If the Na ₂ O content is too high, vitrification may become unstable.

CuO is a component for absorbing near infrared rays. The content of CuO is mass%, preferably 0.3 to 20%, more preferably 0.3 to 15%, still more preferably 0.4 to 13%. If the CuO content is too low, the desired near-infrared absorption characteristics may not be obtained. On the other hand, if the content of CuO is too large, the light transmittance in the ultraviolet to visible region may be easily lowered. In addition, vitrification may become unstable. The CuO content for obtaining desired optical characteristics is preferably adjusted appropriately depending on the plate thickness.

In addition to the above components, B ₂ O ₃ , Nb ₂ O ₅ , Y ₂ O ₃ , La ₂ O ₃ , Ta ₂ O ₅ , CeO ₂ or Sb ₂ O ₃ and the like are within the range that does not impair the effects of the present invention. It may be contained in. Specifically, the content of each of these components is mass%, preferably 0 to 3%, and more preferably 0 to 2%.

By making the glass plate 2 have the above composition, it is possible to achieve both higher light transmittance in the visible region and further excellent light absorption characteristics in the infrared region. Specifically, the light transmittance at a wavelength of 400 nm is preferably 78% or more, more preferably 80% or more, and the light transmittance at a wavelength of 500 nm is preferably 83% or more, more preferably 85% or more. .. On the other hand, the light transmittance at a wavelength of 700 nm is preferably 12% or less, more preferably 9% or less, and the light transmittance at a wavelength of 800 nm is preferably 5% or less, more preferably 3% or less.

The glass plate 2 having the above composition is formed into a plate shape by, for example, a casting method, a rollout method, a downdraw method, a redraw method, a float method, an overflow method, or the like.

In this embodiment, the optical film 3 is formed on both main surfaces 2a of the glass plate 2. The optical film 3 includes a protrusion 3a that protrudes outward beyond the end of the main surface 2a of the glass plate 2.

The protruding portion 3a extends outward along the main surface 2a of the glass plate 2, and the tip end portion of the protruding portion 3a is separated from the end surface 2b of the glass plate 2. The protruding portion 3a does not necessarily have to be parallel to the main surface 2a of the glass plate 2, and may be inclined such that the tip of the protruding portion 3a hangs down. Further, a part of the base end portion of the protruding portion 3a may be in contact with the end surface 2b of the glass plate 2.

The protruding portion 3a is formed in a frame shape so as to surround the entire circumference of the main surface 2a of the glass plate 2 (see the cross-hatched portion in FIG. 2).

The protrusion dimension t1 in the plane direction of the protrusion 3a is preferably 1 μm to 0.1 mm, and more preferably 3 μm to 20 μm. With such a protrusion size, the protrusion 3a is in a state of sufficiently protruding outward, so that it is difficult for other members to come into direct contact with the end surface 2b of the glass plate 2, and the end surface 2b of the glass plate 2 Dust generation and damage can be reduced.

The thickness of the optical film 3 is thinner than the thickness of the glass plate 2 and is preferably 10 μm or less. It is more preferably 7 μm or less. On the other hand, the thickness of the optical film 3 is preferably 0.1 μm or more, more preferably 0.2 μm or more.

The optical film 3 is appropriately selected depending on the intended use, and for example, functional films such as an antireflection film (AR film), an infrared shielding film (IR cut film), an ultraviolet shielding film, an ultraviolet ray and an infrared shielding film are used. Can be mentioned. Further, the optical film 3 may have the functions of both an antireflection film and an infrared shielding film. As the optical film 3 having such a function, for example, a dielectric multilayer film formed by alternately laminating low refractive index layers and high refractive index layers can be used. As the low refractive index layer, a silicon oxide film or the like is used. As the high refractive index layer, a metal oxide film composed of at least one selected from tantalum oxide, niobium oxide, titanium oxide, hafnium oxide, silicon nitride, and zirconium oxide is used. The optical film 3 formed on one main surface 2a of the glass plate 2 and the optical film 3 formed on the other main surface 2a of the glass plate 2 may be films having the same function. , It may be a film having a different function. Specifically, the configuration of the glass plate 2 with an optical film is, for example, an antireflection film / glass plate / antireflection film, an antireflection film / glass plate / infrared shielding film, an infrared shielding film / glass plate / infrared shielding film, and the like. Infrared shielding film / glass plate / ultraviolet ray and infrared shielding film.

In the case of the glass plate 2 with an optical film having the above configuration, the optical film 3 is formed in a wider range than the main surface 2a of the glass plate 2 by the protruding portion 3a. Therefore, the optical film 3 can be reliably formed in the vicinity of the end portion of the main surface 2a of the glass plate 2.

Next, a method for manufacturing the glass plate 2 with an optical film according to the first embodiment will be described.

This manufacturing method includes a film forming step, a cutting step, and an etching step in this order. In the present embodiment, as shown in FIGS. 3 and 4, a plurality of glass plate laminates 6 including the product-sized glass plate 2 are collected from the original glass plate laminate 5 including the large plate original glass plate 4. An example of performing so-called multi-chamfering is shown. Of course, one glass plate laminate 6 may be collected from the original glass plate laminate 5 for the purpose of trimming or the like. In this manufacturing method, the original glass plate laminate 5 → the glass plate laminate 6 → the glass plate 1 with an optical film are manufactured in this order.

As shown in FIG. 3, in the film forming step, the optical film 3 is formed on both main surfaces 4a of the original glass plate 4 of the large plate to manufacture the original glass plate laminate 5. The optical film 3 is formed on the entire surface of each main surface 4a of the original glass plate 4. The optical film 3 is formed by, for example, a vacuum vapor deposition method, a sputtering method, or the like.

As shown in FIG. 4, in the cutting step, for example, the original glass plate laminate 5 is cut in a grid pattern to manufacture a plurality of glass plate laminates 6. In the illustrated example, nine glass plate laminates 6 are collected from one original glass plate laminate 5. The cutting method of the original glass plate laminate 5 is not particularly limited, and for example, mechanical cutting by a blade of a dicing device, folding splitting, laser cutting, laser cutting, or the like can be used.

As shown in FIG. 5, in the etching step, the glass plate laminate 6 is immersed in an etching solution E contained in an etching tank (not shown) for etching.

When the glass plate 2 contained in the glass plate laminate 6 is the phosphate-based glass as described above, the etching solution E is composed of, for example, an alkaline detergent. This is because the phosphate-based glass has a lower alkali resistance than other glasses such as the fluoride-based glass. The alkaline detergent is not particularly limited, and for example, a detergent containing an alkaline component such as Na or K, a surfactant such as triethanolamine, benzyl alcohol or glycol, or water or alcohol can be used.

As the alkaline component contained in the alkaline detergent, it is preferable that an alkaline salt of a chelating agent such as an aminopolycarboxylic acid is contained. Examples of the alkali salt of aminopolycarboxylic acid include sodium salts and potassium salts such as diethylenetriaminepentacetic acid, ethylenediaminetetraacetic acid, triethylenetetraaminehexacetic acid and nitrilotriacetic acid. Among these, diethylenetriamine pentaacetic acid pentasodium, ethylenediaminetetraacetate tetrasodium, triethylenetetraamine hexaacetic acid hexasodium, and nitrilotriacetic acid trisodium are preferably used, and diethylenetriamine pentaacetic acid pentasodium is particularly preferably used.

The etching solution E reacts with the glass plate 2 but does not substantially react with the optical film 3. In the present embodiment, since the optical film 3 is formed on both main surfaces 2a of the glass plate 2 included in the glass plate laminate 6, when the glass plate laminate 6 is immersed in the etching solution E, the glass plate 2 is formed. Only the end of the glass reacts with the etching solution E in direct contact with the etching solution E. Therefore, only the end portion of the glass plate 2 is gradually eroded by the etching solution E, and the position of the end surface 2b of the glass plate 2 moves in the A direction. As a result, only the surface layer portion X1 (cross-hatched portion in FIG. 5) at the end of the glass plate 2 is removed while the optical film 3 remains as it is. Therefore, as shown in FIG. 1, a glass plate 2 with an optical film is manufactured, in which an optical film 3 having a protrusion 3a is formed on both main surfaces 2a of the glass plate 2.

The thickness t2 removed in the plane direction by etching is preferably 1 μm to 0.1 mm, more preferably 3 μm to 20 μm. It is preferable that the removed thickness t2 substantially coincides with the protrusion dimension t1 of the protrusion 3a in FIG.

In this manufacturing method, since both main surfaces 2a of the glass plate 2 are protected by the optical film 3 in the state of the glass plate laminate 6, the glass plate 2 is not changed in the thickness of the glass plate 2 in the etching step. It is possible to perform the end face processing of 2.

(Second embodiment)
As shown in FIG. 6, the difference between the glass plate 1 with an optical film according to the second embodiment and the glass plate 1 with an optical film according to the first embodiment is that the end surface 2b of the glass plate 2 is chamfered. It is a point.

The end surface 2b of the glass plate 2 has a chamfered portion 2c formed of an inclined plane inclined with respect to the main surface 2a in a part of both main surfaces 2a side. The inclination angle θ of the chamfered portion 2c with respect to the main surface 2a is preferably 20 ° to 60 °. The shape of the chamfered portion 2c is not particularly limited, and may be formed from, for example, a convex curved surface (arc surface or elliptical arc surface) or a composite plane in which a plurality of planes having different inclination angles are connected. Further, a chamfered portion may be provided on the entire end surface 2b by making the entire end surface 2b of the glass plate 2 a convex curved surface.

When the chamfered portion 2c is formed on the end surface 2b of the glass plate 2, the end surface 2b may have a portion Y (cross-hatched portion in FIG. 6) located outside the protruding portion 3a of the optical film 3. .. By doing so, it becomes easy for other members to come into direct contact with the end surface 2b of the glass plate 2, but since the mechanical strength of the end surface 2b is improved by the chamfered portion 2c, dust is generated or damaged from the end surface 2b of the glass plate 2. Can be reduced. When the protruding portion Y is provided, the protrusion dimension t3 of the protrusion 2 can be reduced, so that the etching time in the etching step described later can be shortened and the manufacturing efficiency can be improved. Of course, the protruding portion Y may not be provided.

In the present embodiment, the chamfered portion 3b is also formed at the tip of the protruding portion 3a of the optical film 3. The shape of the chamfered portion 3b is not particularly limited, but the same shape as the chamfered portion 2c of the glass plate 2 can be selected. The chamfered portion 3b of the optical film 3 may be omitted, and only the chamfered portion 2c of the glass plate 2 may be provided.

The protrusion dimension t3 in the plane direction of the protrusion 3a is preferably 1 μm to 0.1 mm, and more preferably 3 μm to 20 μm.

Next, a method for manufacturing the glass plate 2 with an optical film according to the second embodiment will be described.

This manufacturing method includes a film forming process, a cutting process, a chamfering process, and an etching process in this order. In this embodiment, an example is shown in which the cutting step also serves as a chamfering step and chamfering is also performed in the process of cutting the original glass plate laminate 5.

In the film forming step, the original glass plate laminate 5 is manufactured by the same method as in the first embodiment (see FIG. 3).

As shown in FIGS. 7 and 8, the cutting step is a first step of cutting the surface layer portion 5s of the original glass plate laminate 5 including the vicinity of the main surface 4a of the original glass plate 4 by the first blade 21 of the dicing device. As shown in FIG. 9, the second blade 22 of the dicing apparatus includes a second step of cutting the central portion 5c of the original glass plate laminated body 5 left uncut in the first step.

As shown in FIGS. 7 and 8, the first blade 21 has a disk shape that is rotatably held and has a cutting blade 21a at its peripheral edge. The cutting blade 21a has a pair of inclined surfaces 21b that are inclined in opposite directions so as to form a V-shaped convex portion.

As shown in FIG. 9, the second blade 22 is also rotatably held in a disk shape, and has a cutting blade 22a at its peripheral edge. The second blade 22 is thinner than the first blade 21. The shape of the cutting blade 22a is not particularly limited as long as it can cut the original glass plate laminate 5 within the thickness range of the second blade 22. In addition, instead of the second blade 22, cutting by laser irradiation may be used.

In the first step, first, as shown in FIG. 7, one surface layer portion 5s of the original glass plate laminate 5 is cut while rotating the first blade 21, and one surface layer portion 5s of the original glass plate laminate 5 is cut. A V-shaped groove 5a corresponding to the shape of the cutting blade 21a is formed on the surface. After that, as shown in FIG. 8, the original glass plate laminate 5 in which the groove 5a is formed is turned upside down, and the other surface layer portion 5s of the original glass plate laminate 5 is cut while rotating the first blade 21. A V-shaped groove 5a corresponding to the shape of the cutting blade 21a is also formed on the other surface layer portion 5s of the original glass plate laminate 5. Next, in the second step, as shown in FIG. 9, the second blade 22 connects the groove bottoms of the V-shaped grooves 5a formed on both surface layer portions 5s of the original glass plate laminated body 5. The central portion 5c of the original glass plate laminate 5 is cut while rotating the original glass plate laminate 5, and the original glass plate laminate 5 is cut (full cut). As a result, the glass plate laminate 6 is manufactured from the original glass plate laminate 5, and the manufactured glass plate laminate 6 is formed with chamfered portions 2c and 3b in the portion corresponding to the V-shaped groove 5a. The glass.

Of course, the chamfering step may be performed as another step after the cutting step is completed. In this case, as shown in FIG. 10, the chamfering step can be performed by using the rotary grindstone 23. Specifically, the rotary grindstone 23 includes a pair of conical machined surfaces 23a having inclinations opposite to each other in the plate thickness direction of the glass plate laminate 6 manufactured in the cutting step. The glass plate laminate 6 polished by the rotary grindstone 23 is polished into a shape that follows the machined surface 23a of the rotary grindstone 23. That is, chamfered portions 2c and 3b are formed on the end faces of the glass plate 2 and the optical film 3 at positions polished by the processed surface 23a. The chamfering step includes the first step of forming the chamfered portions 2c and 3b on the end surface of one of the main surfaces 2a of the glass plate 2 and the chamfered portions 2c and 3b on the end surface of the glass plate 2 on the other main surface 2a side. It may be divided into the second step of forming.

As shown in FIG. 11, in the etching step, the glass plate laminate 6 on which the chamfered portions 2c and 3b are formed is immersed in the etching solution E. Then, only the end portion of the glass plate 2 that is in direct contact with the etching solution E is gradually eroded, and the position of the end surface 2b of the glass plate 2 moves in the A direction. As a result, the surface layer portion X2 (cross-hatched portion in the figure) at the end of the glass plate 2 is removed while the optical film 3 remains as it is. At this time, the position of the end face 2b changes, but the shape of the end face 2b is generally maintained. Therefore, the chamfered portion 2c of the glass plate 2 remains even after the etching step. Further, since the optical film 3 does not react with the etching solution E, the chamfered portion 3b of the optical film 3 after the etching step remains. Therefore, as shown in FIG. 6, an optical film 3 having a protrusion 3a is formed on both main surfaces 2a of the glass plate 2, and chamfered portions 2c and 3b are formed on the glass plate 2 and the optical film 3. The glass plate 2 with an optical film is manufactured.

The thickness t4 removed in the plane direction by etching is preferably 1 μm to 0.1 mm, more preferably 3 μm to 20 μm. It is preferable that the removed thickness t4 substantially coincides with the protrusion dimension t3 of the protrusion 3a in FIG.

(Third embodiment)
As shown in FIG. 12, the difference between the glass plate 1 with an optical film according to the third embodiment and the glass plate 1 with an optical film according to the first embodiment and the second embodiment is that the protrusion 3a is provided. The point is that the optical film 3 to have is formed only on one main surface 2a of the glass plate 2. Although the chamfered portion is not provided in the illustrated example, the chamfered portion as described in the second embodiment may be provided.

The protrusion dimension t5 in the plane direction of the protrusion 3a is preferably 1 μm to 0.1 mm, and more preferably 3 μm to 20 μm.

The method for manufacturing the glass plate 2 with an optical film configured as described above includes a film forming step, a cutting step, and an etching step in this order.

As shown in FIG. 13, in the film forming step, the optical film 3 is formed only on one main surface 4a of the original glass plate 4, and the original glass plate laminate 5 is manufactured. The optical film 3 is formed on the entire surface of one main surface 4a of the original glass plate 4.

In the cutting step, one or a plurality of glass plate laminates 6 are manufactured from the original glass plate laminate 5 by the same method as in the first embodiment (see FIG. 4). However, in the manufactured glass plate laminate 6, the optical film 3 is formed only on one main surface 2a of the glass plate 2.

As shown in FIG. 14, in the etching step, the glass plate laminate 6 is immersed in the etching solution E. Then, the end portion of the glass plate 2 in direct contact with the etching solution E and the main surface 2a on the side where the optical film 3 is not formed are gradually eroded, and the end surface 2b of the glass plate 2 moves in the A direction. , The main surface 2a of the glass plate 2 moves in the B direction. As a result, the surface layer portion X3 (cross-hatched portion in the figure) at the end of the glass plate 2 and the surface layer portion X4 (cross-hatched portion in the figure) of the main surface 2a are removed while the optical film 3 remains as it is. Will be done. Therefore, as shown in FIG. 12, a glass plate 2 with an optical film is manufactured, in which an optical film 3 having a protruding portion 3a is formed only on one main surface 2a of the glass plate 2.

The thickness t6 removed in the plane direction by etching is preferably 1 μm to 0.1 mm, more preferably 3 μm to 20 μm. It is preferable that the removed thickness t6 substantially coincides with the protrusion dimension t5 of the protrusion 3a in FIG. Further, the thickness t7 removed in the plate thickness direction by etching is preferably 1 μm to 0.1 mm, more preferably 3 μm to 20 μm.

In this manufacturing method, since only one main surface 2a of the glass plate 2 is protected by the optical film 3, the thickness of the glass plate 2 changes in the etching step. Therefore, in addition to the end face processing of the glass plate 2, the slimming processing (thinning) of the glass plate 2 can be performed.

The present invention is not limited to the configuration of the above embodiment, and is not limited to the above-mentioned action and effect. The present invention can be modified in various ways without departing from the gist of the present invention.

In the above embodiment, the case where the film forming step is performed before the cutting step has been described, but the film forming step may be performed after the cutting step (when the chamfering step is performed, after the chamfering step).

In the above embodiment, the cutting step may be omitted and the optical film may be directly formed on the product-sized glass plate in the film forming step.

In the above embodiment, the optical film may be removed from the main surface of the glass plate after the etching step.

In the above embodiment, in the cutting step, the cut portion of the original glass plate laminate may be irradiated with a laser while injecting gas, and the cut portion may be laser-fused. In this case, by adjusting the injection amount and the injection direction of the gas, the cut end surface can be processed into a convex curved surface (for example, an arc surface). Therefore, even if such laser cutting is used, chamfering can be performed at the same time as cutting.

In the above embodiment, instead of immersing the entire glass plate laminate in the etching solution, for example, the etching solution is applied to a part of the glass plate (for example, the end face) contained in the glass plate laminate by coating or the like. Only a part of the glass plate may be etched.

1 Glass plate with optical film 2 Glass plate 2a Main surface 2b End surface 2c Chamfered part 3 Optical film 3a Extruded part 3b Chamfered part 4 Original glass plate 5 Original glass plate laminate 6 Glass plate laminate 21 First blade 22 Second Blade 23 Rotary grindstone E Etching liquid

Claims (11)

A glass plate with an optical film including a pair of front and back main surfaces, a glass plate having an end surface connecting the ends of each of the pair of main surfaces, and an optical film formed on at least one of the main surfaces of the glass plate. In
The optical film comprises a protrusion that protrudes outward beyond the end of the main surface of the glass plate.
A glass plate with an optical film , wherein the protruding portion extends outward along the main surface of the glass plate and is separated from the end surface of the glass plate. The glass plate with an optical film according to claim 1, wherein the end face is chamfered, and the end face has a portion located outside the protruding portion. The glass plate with an optical film according to claim 1 or 2, wherein the optical film is at least one of an antireflection film, an infrared shielding film, an ultraviolet shielding film, an ultraviolet ray, and an infrared shielding film. The glass plate with an optical film according to any one of claims 1 to 3, wherein the glass plate contains 25% or more of P ₂ O ₅ in mass% by mass. The glass plate with an optical film according to any one of claims 1 to 4, wherein the protrusion dimension of the protrusion is 1 μm to 0.1 mm. A glass plate with an optical film including a pair of front and back main surfaces, a glass plate having an end surface connecting the ends of each of the pair of main surfaces, and an optical film formed on at least one of the main surfaces of the glass plate. It is a manufacturing method of
It is provided with an etching step of contacting at least the end surface of the glass plate on which the optical film is formed with an etching solution to perform etching.
A method for producing a glass plate, wherein the glass plate is made of phosphate-based glass, and the etching solution is an alkaline detergent. The etching solution contains an alkaline salt of a chelating agent as the alkaline component.
The method for manufacturing a glass plate with an optical film according to claim 6, wherein in the etching step, the glass plate on which the optical film is formed is immersed in the etching solution. 6. 7. The method for manufacturing a glass plate with an optical film according to 7. The method for manufacturing a glass plate with an optical film according to claim 8, wherein the cutting step also serves as the chamfering step and chamfering is performed at the same time as cutting the glass plate. The method for manufacturing a glass plate with an optical film according to any one of claims 6 to 9, wherein the optical film is formed only on one of the main surfaces of the glass plate. The method for manufacturing a glass plate with an optical film according to any one of claims 6 to 9, wherein the optical film is formed on the main surfaces of both of the glass plates.

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