Abstract: The present invention relates to a glass plate which is provided with a first main surface, and a second main surface which faces the first main surface. An antiglare portion and a non-antiglare portion are provided to the first main surface. The average lengths (RSm) of elements of roughness curves of the antiglare portion and the non-antiglare portion are respectively 1 ?m or higher. The difference between the RSm of the antiglare portion and the RSm of the non-antiglare portion is 100 ?m or lower.

Abstract: A glass substrate unit includes a glass substrate and a glass deformation device for deforming the glass substrate. The glass substrate includes a thin portion and a thick portion, the thin portion having a first main surface and a second main surface opposite to the first main surface, the thick portion having a first main surface and a second main surface opposite to the first main surface and having a sheet thickness larger than a sheet thickness of the thin portion. The glass deformation device deforms the glass substrate by moving one of the thin portion and the thick portion.

Abstract: An antiglare glass substrate includes a glass substrate having a first main surface and a second main surface that is opposite to the first main surface. The first main surface has undergone an antiglare treatment and a fluorine-containing organosilicon compound coating film as an antifouling film is laminated thereon. The first main surface partly includes a non-antiglare-treated portion that has not undergone the antiglare treatment. The non-antiglare-treated portion has a surface roughness Ra of less than 10 nm. A difference in height along a plate thickness direction of the glass substrate between the antiglare-treated portion that has undergone the antiglare treatment and the non-antiglare-treated portion is 10 ?m or larger and 200 ?m or less.

Abstract: A cover glass includes a glass substrate and an antireflection film disposed on at least one of main surfaces of the glass substrate, and the at least one of main surfaces of the glass substrate has one or more cracks formed therein, the crack(s) each having a length of 5 ?m or less, and a difference ?a* in a* value between any two points within a surface of the cover glass on the side where the antireflection film has been disposed and a difference ?b* in b* value between any two points within the surface of the cover glass on the side where the antireflection film has been disposed satisfy the following expression: ?{(?a*)2+(?b*)2}?4.

Abstract: A cover glass includes: a glass substrate having a convex and concave shape formed on at least one of surfaces thereof by an antiglare treatment; and an antireflection film disposed on the surface of the glass substrate, the surface having the convex and concave shape. In the cover glass, a difference ?a* in a* value between any two points within a surface of the cover glass on the side where the antireflection film is present and a difference ?b* in b*value between any two points within the surface of the cover glass on the side where the antireflection film is present satisfy the following expression: ?{(?a*)2+(?b*)2}?4.

Abstract: An antiglare glass substrate includes a glass substrate having a first main surface and a second main surface that is opposite to the first main surface. The first main surface has undergone an antiglare treatment and a fluorine-containing organosilicon compound coating film as an antifouling film is laminated thereon. The first main surface partly includes a non-antiglare-treated portion that has not undergone the antiglare treatment. The non-antiglare-treated portion has a surface roughness Ra of less than 10 nm.

Abstract: An antiglare glass substrate includes a glass substrate having a first main surface and a second main surface that is opposite to the first main surface. The first main surface has undergone an antiglare treatment and a fluorine-containing organosilicon compound coating film as an antifouling film is laminated thereon. The first main surface partly includes a non-antiglare-treated portion that has not undergone the antiglare treatment. The non-antiglare-treated portion has a surface roughness Ra of less than 10 nm. A difference in height along a plate thickness direction of the glass substrate between the antiglare-treated portion that has undergone the antiglare treatment and the non-antiglare-treated portion is 10 ?m or larger and 200 ?m or less.

Abstract: The present invention relates to a glass plate which is provided with a first main surface, and a second main surface which faces the first main surface. An antiglare portion and a non-antiglare portion are provided to the first main surface. The average lengths (RSm) of elements of roughness curves of the antiglare portion and the non-antiglare portion are respectively 1 ?m or higher. The difference between the RSm of the antiglare portion and the RSm of the non-antiglare portion is 100 ?m or lower.

Abstract: A glass article includes a glass plate including a rugged surface configured to diffuse and reflect an external light formed on at least one of main surfaces; and a functional film formed on the rugged surface. A transmission haze of the glass article is 28% or less. On a surface of the functional film opposite to the glass plate, within a region with a visual field area of 60000 ?m2 observed by using a laser microscope, a pore representative diameter is less than 12 ?m. An area ratio of a surface area A (?m2) of the surface of the functional film within the region to the visual field area (A/60000) is 1.02 or more and 1.07 or less.

Abstract: An antiglare glass substrate includes a glass substrate having a first main surface and a second main surface that is opposite to the first main surface. The first main surface has undergone an antiglare treatment and a fluorine-containing organosilicon compound coating film as an antifouling film is laminated thereon. The first main surface partly includes a non-antiglare-treated portion that has not undergone the antiglare treatment. The non-antiglare-treated portion has a surface roughness Ra of less than 10 nm. A difference in height along a plate thickness direction of the glass substrate between the antiglare-treated portion that has undergone the antiglare treatment and the non-antiglare-treated portion is 10 ?m or larger and 200 ?m or less.

Abstract: A cover glass includes a glass substrate and an antireflection film disposed on at least one of main surfaces of the glass substrate, and the at least one of main surfaces of the glass substrate has one or more cracks formed therein, the crack(s) each having a length of 5 ?m or less, and a difference ?a* in a* value between any two points within a surface of the cover glass on the side where the antireflection film has been disposed and a difference ?b* in b* value between any two points within the surface of the cover glass on the side where the antireflection film has been disposed satisfy the following expression: ?{(?a*)2+(?b*)2}?4.

Abstract: A cover glass includes: a glass substrate having a convex and concave shape formed on at least one of surfaces thereof by an antiglare treatment; and an antireflection film disposed on the surface of the glass substrate, the surface having the convex and concave shape. In the cover glass, a difference ?a* in a* value between any two points within a surface of the cover glass on the side where the antireflection film is present and a difference ?b* in b* value between any two points within the surface of the cover glass on the side where the antireflection film is present satisfy the following expression: ?{(?a*)2+(?b*)2}?4.

Abstract: To provide an adhesive layer-equipped transparent plate, which satisfies both visibility and impact resistance, and which is suitable for protection of an in-vehicle display device. The adhesive layer-equipped transparent plate according to the present invention comprises a transparent plate and an adhesive layer provided on one surface of the transparent plate. The transparent plate is a plate glass having a plate thickness of from 0.4 to 3.0 mm. The adhesive layer has a storage shear modulus of at most 30 MPa at a temperature of 25° C. and at a frequency of 1 Hz, a storage shear modulus of at least 50 MPa at a temperature of 25° C. and at a frequency of 40 kHz, and a loss tangent tan? of at least 0.1 at a temperature of 25° C. and at a frequency of 40 kHz.

Abstract: The present invention relates to a glass substrate for a magnetic recording medium, which is a disk-shaped glass substrate for a magnetic recording medium having a circular hole at the center thereof, in which the glass substrate for a magnetic recording medium has an inner peripheral side surface, an outer peripheral side surface and both main surfaces, and the both main surfaces have parallelism of 3.2 ?m or less in at least a recording and reproducing region thereof.

Abstract: A method for measuring the shape of a heating treatment jig to be held by a holding portion of a vertical heat treatment apparatus includes measuring the shape of the heat treatment jig in a state that the position of a supporting portion for supporting the heat treatment jig is set to be the same as the position of the holding portion for the heat treatment jig in the vertical heat treatment apparatus. The heat treatment jig can be used for placing a semiconductor wafer to be subjected to heat treatment.

Abstract: A low-expansion glass substrate for a reflective mask, wherein the glass substrate is suited for a base material of a reflective mask employed in a lithographic process in semiconductor fabrication, comprises a lateral surface, a chamfered portion and a notched portion formed along an outer periphery thereof, at least one of the lateral surface, the chamfered portion and the notched portion being provided with a mirror-finished surface.

Abstract: It is to provide a photomask substrate which has a low birefringence and with which polarized illumination can be employed or immersion exposure can be carried out. A photomask substrate made of a synthetic quartz glass to be used for production of a semiconductor employing a light source having an exposure wavelength of at most about 200 nm, which has a birefringence of at most 1 nm/6.35 mm at the exposure wavelength, and of which the amount of decrease in light transmittance is at most 1.0% as a difference in light transmittance at a wavelength of 217 nm, between before and after irradiation with Xe excimer lamp with an illuminance of 13.2 mW/cm2 for 20 minutes.

Abstract: A method for measuring the shape of a heating treatment jig to be held by a holding portion of a vertical heat treatment apparatus includes measuring the shape of the heat treatment jig in a state that the position of a supporting portion for supporting the heat treatment jig is set to be the same as the position of the holding portion for the heat treatment jig in the vertical heat treatment apparatus. The heat treatment jig can be used for placing a semiconductor wafer to be subjected to heat treatment.

Abstract: To provide a polishing method for a glass substrate required to have extremely high surface smoothness and surface precision, like a glass substrate to be used for e.g. a reflective mask for extreme ultra violet lithography. A surface of a glass substrate containing SiO2 as the main component, is polished with a polishing slurry comprising colloidal silica having an average primary particle size of at most 50 nm, an acid and water, and having the pH adjusted to be within a range of from 0.5 to 4, so that the surface roughness Rms will be at most 0.15 nm as measured by an atomic force microscope.

Abstract: A low-expansion glass substrate for a reflective mask, wherein the glass substrate is suited for a base material of a reflective mask employed in a lithographic process in semiconductor fabrication, comprises a lateral surface, a chamfered portion and a notched portion formed along an outer periphery thereof, at least one of the lateral surface, the chamfered portion and the notched portion being provided with a mirror-finished surface.