Abstract: A manufacturing method for a photomask includes a step of performing a writing operation at a predetermined scanning unit in a direction in which a head of a writing system is to be scanned (Y direction) and at a predetermined overrun unit in a direction perpendicular to the scanning direction (X direction). A pattern of the photomask includes a cyclic pattern. The writing step includes a step of writing pattern units (e.g., pixel units 20) under identical overrun conditions (e.g., a grid head 17a is aligned with the left end of each pixel unit 20 such that writing is commenced from the left end of each pixel unit 20), the pattern units including identical cyclic patterns.

Abstract: When a forming a bevel on a lens, the value of the bevel curve is calculated based on the value of the curve of the concave face, a reference axis of the bevel curve is determined to be in the same direction as the curvature of the concave face, a reference position on the peripheral edge of the lens in the first portion having the minimum thickness is determined based on the thickness of the first portion, a correction for the initial reference axis of the bevel curve is obtained, an angle of inclination from the direction of the initial reference axis of the bevel curve is obtained based on the correction and the locus of the bevel is determined based on the value of the bevel curve, the reference position and the angle of inclination.

Abstract: Disclosed is an optical glass having high-refractivity and low-dispersion optical properties and having a low glass transition point so that a heat-treating furnace can be operated for a long period of time. The present invention provides an optical glass having a refractive index nd of at least 1.875, an Abbe's number vd of at least 39.5 and a glass transition point Tg of 700° C. or lower, an optical glass which is a borosilicate glass comprising at least one selected from La2O3, Gd2O3, Y2O3 or Yb2O3 and at least one selected from ZrO2, Ta2O5 or Nb2O5, wherein the ratio (weight ratio) of the total content of La2O3, Gd2O3, Y2O3 and Yb2O3 to the total content of SiO2 and B2O3 is from 3.2 to 5 and the ratio (weight ratio) of the total content of ZrO2, Ta2O5 and Nb2O5 to the total content of SiO2 and B2O3 is from 1.1 to 1.5, and which has a refractive index nd of at least 1.875 and an Abbe's number vd of at least 39.5, and the like.

Abstract: An apparatus for processing a lens comprising: a means for supporting a lens that freely displaces towards a tool and comprises a holding shaft supporting the lens so that the lens freely rotates, and a means for detecting an angle that detects a rotation angle of the holding shaft; a means for positioning that moves to contact with and separated from the means for supporting a lens, wherein the means for positioning restricts displacement of the means for supporting the lens towards the tool at a position corresponding to a prescribed lens processing amount determined based on the rotation angle and the data describing a shape of a lens frame; a means for amplifying a relative displacement that amplifies a relative displacement between the means for supporting a lens and a means for positioning; and a means for detection that detects when processing conducted at the rotation angle is complete.

Abstract: A substrate for an information recording medium, which is made of a glass or crystallized glass, (1) which has a region that has a spectral light transmittance of 50% or less converted in terms of a thickness of 2 mm in a wavelength range of 2,750 nm to 3,700 nm, (2) which shows a spectral light transmittance of 70% or less converted in terms of a thickness of 2 mm over whole wavelength range of 2,750 nm to 3,700 nm, (3) which contains an infrared absorbent that is a specific metal oxide and is for use in a perpendicular magnetic recording medium, (4) which is to be heated by irradiation with infrared ray and contains more than 200 ppm of water, or (5) which contains an infrared absorbent that is a specific metal oxide and is used as a substrate to support a multi-layered film including an information recording layer to be formed by sputtering after heating by irradiation with infrared ray, an information recording medium comprising a multi-layered film including an information recording layer formed on any o

Abstract: In a magnetic recording medium, surface roughness of a glass substrate and the variation of the surface roughness are suppressed to the predetermined range. Namely, the surface roughness (Rmax, Ra, Rq) and the relation (Rmax/Ra) between Rmax and Ra are restricted to the predetermined range. In this event, Ra is representative of a center-line mean roughness, Rmax is defined as a maximum height representative of a difference between a highest point and a lowest point and Rq is representative of a root mean square roughness. Thereby, crystal grains of an underlying layer and a magnetic layer formed thereon are equalized. Specifically, the surface roughness is specified by Rmax?15 nm, Ra?1 nm and Rq?1.5 nm. Further, the ratio between the surface roughness Rmax and the surface roughness Ra is specified by Rmax/Ra?30.

Abstract: Disclosed is a photocatalytic filter which can fully secure a space of gaps to constitute a flow path for flowing a fluid to be disposed of and which has gaps structured for easily trapping an organic substance in the fluid when the fluid is brought into contact with a photocatalyst layer.

Abstract: There are disclosed an optical filtering module and various optical devices using the filtering module. The optical filtering module has an optical filter for transmitting, attenuating or reflecting light having a certain wavelength range, a first optical system having an optical fiber for guiding light to be transferred to the optical filter, a second optical system having an optical fiber for guiding light transferred from the optical filter, the second optical system being opposingly arranged to the first optical system while interposing the optical filter therebetween and an outer cylindrically shaped glass holder for holding therein the optical filter, the first optical system and the second optical system secured thereto.

Abstract: A spectacle lens is designed by using a value determined by either measuring or specifying for an individual spectacles wearer the value of the distance VR from a reference point on the back surface of a spectacle lens to the center of rotation of the eye, which adds together the value of the distance VC from a reference point of the back surface of a spectacle lens to the vertex of the cornea of the eye of the spectacles wearer at spectacle lenses wearing time, which is one of the required data in spectacle lens design, and the distance CR from the above-mentioned vertex of the cornea to the center of rotation of the eye, and manufacturing a spectacle lens based on this design specification.

Abstract: A precision press-molding preform for producing an optical element for use in an imaging device using a CCD type or MOS type solid image-sensing device, which is formed of a glass composition containing, by mol %, 25 to 45% of P205, 0.5 to 10% of CuO, 0 to 10% of B203, 0 to 10% of Al203, 2 to 30% of Li2O, 0 to 25% of Na2O, 0 to 15% of K2O, the total content of Li2O, Na2O and K2O being 3 to 40%, 3 to 45% of BaO, 0 to 30% of ZnO, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of Bi2O3, 0 to 5% of La2O3, 0 to 5% of Gd2O3 and 0 to 5% of Y2O3, the total content of these components being at least 98%, and a precision press-molding preform, which is formed of a phosphate glass containing CuO, an alkali metal oxide, BaO and ZnO and having a BaO content/ZnO content molar ratio (BaO/ZnO) of greater than 1.

Abstract: An optical glass that has high-refractivity and high-dispersion properties, that is less colored and that is suitable for a shapable glass material for press-shaping and various optical elements, the optical glass containing, as glass components and by mass %, 10 to 32% of P2O5, 27 to 65% of Nb2O5, 10 to 30% of BaO, 0 to 12% of B2O3, more than 0% but not more than 20% of TiO2, more than 0% but not more than 10% of total of Li2O, Na2O and K2O, and more than 0% but not more than 1%, based on the total content of the said glass components, of Sb2O3, and having a light transmittance that is 50% at a wavelength of 420 nm or shorter.

Abstract: A laser beam L from a laser 2 is introduced from an introducing surface into a transparent substrate 1 by using mirrors 31 and 32. The laser beam introduced through the transparent substrate 1 repeats a total reflection on the surfaces (main surfaces and end surfaces) of the transparent substrate 1 and enters a state in which the laser beam is almost confined in the substrate 1. When an ununiform portion such as a scratch exists on the surface of the transparent substrate 1, however, total reflecting conditions are not satisfied and the light leaks out of the ununiform portion. The leaked light is formed as an image on a CCD 6 by a lens system 7 and an image process is executed by an image processing apparatus 12. In a detected image, the ununiform portion in which the scratch or the like exists is brightly seen in a linear or a dot form in a black background, so that the ununiform portion such as a very fine scratch can be detected.

Abstract: It is made possible to easily obtain a spectacle lens with higher performance in a spectacle lens designing method in which an eyeball motion (Listing's Law) is taken into consideration. A spectacle lens designing method in which an eye motion (Listing's Law) is taken into consideration, and which uses, as an evaluation function regarding visual acuity constituting a merit function which is used in optimization calculation, a visual acuity evaluation function (logMAR) derived in an ordinary manner from a visual acuity measured value V which is actually measured. Note that the visual acuity evaluation function (logMAR) is represented by the following equation (1), letting a curvature of field be an ordinary aberration of a spectacle lens, and a residual astigmatism be an astigmatism extendedly defined from the spectacle lens designing in which the Listing's Law is taken into consideration the visual acuity evaluation function (logMAR)=log10(1/V(curvature of field, residual astigmatism))??(1).

Abstract: An apparatus for processing a lens including a displaceable lens-holding unit comprising a holding shaft that holds the lens, and a means for detecting a rotation angle of the holding shaft; a means for processing a peripheral portion of the lens; an elevating and lowering unit that holds the lens-holding unit, wherein the elevating and lowering unit displaces to a first position in a vertical direction in accordance with a processing amount; wherein, when the lens-holding unit is lowered until the lens contacts the means for processing, the elevating and lowering unit is separate from the lens-holding unit, wherein the lens-holding unit is further lowered to the first position in the vertical direction in accordance with the processing amount, and the lens-holding unit presses the lens to the means for processing under a load determined in accordance with a weight of the lens-holding unit.

Abstract: A pattern of a transfer mask to transfer, by the use of energy beams, a transfer pattern to a substrate is disclosed, the transfer mask made by forming an aperture pattern in a thin film portion supported by a supporting frame portion. When the transfer pattern includes a shielding pattern in which one part is connected to at least the periphery of the transfer mask, a shielding pattern portion, where the ratio of the surface area of the pattern surface portion on the transfer mask to a sectional area of a supporting portion is larger than 5000, is divided and developed.

Abstract: Methods and a device of manufacturing glass gobs with good productivity without defects in appearance from a glass melt. Glass gobs are manufactured from glass melt gobs by molding and cooling glass melt gobs in glass gob molding parts that are intermittently rotated. In one method, single intermittent rotation period of said glass gob molding part is in a range of 0.1 to 0.25 second, and the single intermittent rotation distance of said glass gob molding part is 0.8-7 cm. The device for molding glass gobs from a continuously flowing glass melt has a turntable intermittently rotated around a rotation axis and glass gob molding molds positioned on said turntable. The glass gob molding mold has multiple glass gob molding parts that receive glass melt on the upper surface thereof and mold the glass melt into glass gobs. The glass gob molding mold is positioned on a turntable so that said glass gob molding parts are disposed at equal intervals around a circumference centered on the rotation axis of the turntable.

Abstract: Provided is a process for producing a small-diameter glass molded lens that is made of a high-refractivity optical glass and having a small central thickness and a biconvex form, without causing cracking or breaking of the lens, and the process includes the steps of introducing a glass material made of an optical glass having a refractive index nd of 1.70 or more and provided with a mold release functional film on a surface into a mold and press-molding the glass material to obtain the glass molded lens, the glass material having a surface free energy of 55 mJ/m2 or less when it is press-molded.

Abstract: Preforms for precision press molding made of optical glass, optical elements, and methods of manufacturing the same are provided. The preforms are suited to precision press molding having a broad range of dispersion characteristics, a low glass transition temperature, a low sag point, and good resistance to devitrification while containing no PbO. The optical element is obtained by precision press molding the preform. One example of the preform has a refractive index (nd) of greater than or equal to 1.7 and an Abbé number (vd) of less than or equal to 32. The other example of the preform has an Abbé number (vd) exceeding 32.

Abstract: A substrate for an information recording medium has a microwaviness average height Ra? not greater than 0.05 microinch as measured by a contactless laser interference technique for measurement points within a measurement region of 50 ?m?-4 mm? on a surface of the substrate. The microwaviness average height Ra? is given by: Ra ? = 1 n ? ? i = 1 n ? ? | xi - x _ | , where xi represents a measurement point value of each measurement point, {overscore (x)} representing an average value of the measurement point values, n representing the number of said measurement points. Alternatively, the substrate has a waviness period between 300 ?m and 5 mm and a waviness average height Wa of 1.0 nm or less as measured by the contactless laser interference technique for measurement points in a measurement region surrounded by two concentric circles which is spaced from a center of a surface of the substrate by a predetermined distance.

Abstract: A glass substrate for a data recording medium is manufactured by using a tabular carrier with circular holes formed therein, housing disk-shaped glass workpieces in the circular holes of this carrier, sliding polishing pads over the surface of the carrier and the principal surfaces of the glass workpieces and polishing the glass workpieces until the height (NRa) of micro-waviness on the principal surfaces of the glass workpieces is reduced to a predetermined value or less. The height (NRa) of micro-waviness of the principal surfaces is a value dependent on the surface roughness of the polishing pad and the surface roughness of this polishing pad is a value dependent on the surface roughness of the carrier. A glass substrate for a data recording medium is manufactured by reducing the surface roughness (Ra) of the carrier to 0.