Tokyo, Japan
Tokyo, Japan

Hoya Corporation is a Japanese company manufacturing optical products such as photomasks, photomask blanks and glass magnetic-memory disks, contact lenses and eyeglass lenses using wavefront technology for the health-care market, medical photonics,lasers, photographic filters, and software. The headquarters are in 2-7-5 Naka-Ochiai, Shinjuku, Tokyo. Hoya Corporation is one of the Forbes Global 2000 Leading Companies and Industry Week 1000 Company.Hoya acquired the camera company Pentax in 2007, for the price of US$1 billion, about 10% more than Pentax was valued at the time. In June 2010 the grandson of the corporation's founder Yutaka Yamanaka proposed changes to the Board of Directors to prevent what he called such "mistakes" from happening again.On October 1, 2011, Hoya sold its Pentax camera business to Ricoh. Wikipedia.


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An object of the present invention is to provide a mask blank substrate and the like that enables critical defects to be reliably detected as a result of reducing the number of detected defects, including pseudo defects, even when using highly sensitive defect inspection apparatuses that use light of various wavelengths. The present invention relates to a mask blank substrate that is used in lithography, wherein the power spectral density at a spatial frequency of 110^(2 )m^(1 )to 1 m^(1), obtained by measuring a 0.14 mm0.1 mm region on a main surface of the mask blank substrate on the side of which a transfer pattern is formed at 640480 pixels with a white-light interferometer, is not more than 410^(6 )nm^(4), and the power spectral density at a spatial frequency of not less than 1 m^(1), obtained by measuring a 1 m1 m region on the main surface with an atomic force microscope, is not more than 10 nm^(4).


Patent
Hoya Corporation | Date: 2017-01-31

A magnetic-disk glass substrate according to the present invention is a doughnut-shaped magnetic-disk glass substrate having a circular hole provided in the center, a pair of main surfaces, and an outer circumferential end surface and an inner circumferential end surface each including a side wall surface and a chamfered surface that is formed between each main surface and the side wall surface. A measurement point is provided on the outer circumferential end surface every 30 degrees in the circumferential direction with reference to a center of the glass substrate, and when a curvature radius of a shape of a portion between the side wall surface and the chamfered surface is determined at each measurement point, the difference in the curvature radius between neighboring measurement points is 0.01 mm or less.


According the present invention, there is provided a glass for use in substrate for information recording medium, which comprises SiO_(2); Al_(2)O_(3); one or more alkali metal oxides selected from the group consisting of Li_(2)O, Na_(2)O and K_(2)O; one or more alkaline earth metal oxides selected from the group consisting of MgO, CaO, SrO and BaO; and one or more oxides selected from the group consisting of ZrO_(2), HfO_(2), Nb_(2)O_(5), Ta_(2)O_(5), La_(2)O_(3), Y_(2)O_(3) and TiO_(2); wherein the contents of various components, in molar percent, are as follows: SiO_(2) : 50, Al_(2)O_(3) : 3, SiO_(2) + Al_(2)O_(3) : 70 to 85; Li_(2)O : 4.3, Na_(2)O : 5, Li_(2)O + Na_(2)O : 24; alkali metal oxides + alkaline earth meal oxides : > 8; MgO : < 3, CaO : 4; and the molar ratios of various components are as follows: ((ZrO_(2) + HfO_(2) + Nb_(2)O_(5) + Ta_(2)O_(5) + La_(2)O_(3) + Y_(2)O_(3) + TiO_(2))/(Li_(2)O + Na_(2)O + K_(2)O + MgO + CaO + SrO + BaO)) : 0.035; (MgO/CaO) : 0.130 to 0.700. Further provided are a substrate for information recording medium, an information recording medium and their manufacturing methods.


Provided is a mask blank in which uniformity of the composition and optical characteristics of a phase-shift film in the in-plane direction and direction of film thickness is high, uniformity of the composition and optical characteristics of the phase-shift film between a plurality of substrates is also high, and defectivity is low even if a silicon-based material is applied to the material that forms the phase-shift film. A mask blank is provided in which a phase-shift film is provided on a transparent substrate, the phase-shift film having a function to transmit ArF exposure light therethrough at a predetermined transmittance and generate a predetermined amount of phase shift in the ArF exposure light that is transmitted therethrough, wherein the phase-shift film comprises a structure in which a low transmission layer and a high transmission layer are laminated, the low transmission layer and the high transmission layer are formed from a material consisting of silicon and nitrogen or a material consisting of silicon, nitrogen and one or more elements selected from semi-metallic elements, non-metallic elements and noble gases, and the low transmission layer has a relatively low nitrogen content in comparison with the high transmission layer.


Patent
Hoya Corporation | Date: 2017-02-28

A magnetic-disk glass substrate capable of suppressing turbulence of air flow in a vicinity of an outer circumferential side edge portion of the magnetic disk and suppressing disk flutter is provided. This magnetic-disk glass substrate includes a pair of main surfaces, a side wall surface formed on an outer circumferential side edge surface, and chamfered surfaces interposed between the side wall surface and the main surfaces, respectively. The side wall surface has a roundness of 1.5 m or less. A difference in radius between an inscribed circle and a circumcircle of a plurality of outlines of the side wall surface at a plurality of positions that include a central position of the magnetic-disk glass substrate in a thickness direction and are different from each other in the thickness direction is 5 m or less.


Patent
Hoya Corporation | Date: 2017-02-24

A magnetic-disk glass substrate has a circular hole at a center, and includes a pair of main surfaces and a side wall surface orthogonal to the main surfaces. A roundness of the circular hole is 1.5 m or less. A difference between a maximum value and a minimum value of radii of three inscribed circles that are respectively derived from outlines in the circumferential direction at three positions spaced apart by 200 m in a substrate thickness direction on the side wall surface of the circular hole is 3.5 m or less.


Patent
Hoya Corporation | Date: 2017-02-24

A magnetic-disk glass substrate has a circular center hole a pair of main surfaces and an edge surface. The edge surface has a side wall surface and chamfered surfaces interposed between the side wall surface and the main surfaces, and a roundness of an edge surface on an outer circumferential side is 1.5 m or less. Also, a midpoint A between centers of two least square circle respectively derived from outlines in a circumferential direction respectively obtained at two positions spaced apart by 200 m in a substrate thickness direction on the side wall surface on the outer circumferential side, and centers B and C respectively derived from a respective one of two chamfered surfaces on the outer circumferential side in the substrate thickness direction, are located such that a sum of respective distances between A and B, and A and C, is 1 m or less.


A load voltage control device, comprising: a load disposed in a tip portion; a power supply circuit and a controller disposed in a proximal end portion; and a cable connecting the tip portion with the proximal end portion, the cable comprising a first and second power supply lines, the power supply circuit comprising at least one power supply, wherein the controller operates to: obtain a voltage applied to the load based on a voltage applied to an input point of the first power supply line, a current flowing through the first power supply line, a voltage applied to an input point of the second power supply line and a current flowing through the second power supply line; and adjust the power supply voltage by controlling the at least one power supply so that the voltage applied to the load becomes substantially equal to a predetermined reference voltage.


Patent
Hoya Corporation and Hoya Glass Disk Vietnam Ii Ltd. | Date: 2017-01-09

A magnetic-disk glass substrate of the present invention has an average value of squares of inclinations of 0.0025 or less and a frequency at which squares of inclinations are 0.004 or more of 15% or less, in a case where samples of inclinations on a main surface are obtained at intervals of 10 nm.


Patent
Hoya Corporation | Date: 2017-07-12

(Technical problem) To provide a small-sized light illuminating apparatus that can allow approximately uniform light irradiation onto the outer periphery of a target object such as an optical fiber. (Problem solving means) A light illuminating apparatus irradiates a target object (F) relatively moveable along a first direction (X) with light, and includes a light source (100) having a plurality of solid-state devices (115) which irradiates the target object (F) with the light in a second direction (Z) perpendicular to the first direction (X); a first reflecting part (311) having at least one first reflecting surface (311a) placed at a downstream side in the second direction below the target object when viewed from the first direction, wherein the first reflecting part (311) reflects a portion of the light from the light source incident on the first reflecting surface (311a) onto the target object; and a second reflecting part (312) having a pair of second reflecting surfaces (312a) standing erect from the light source toward the first reflecting surface (311a), wherein the second reflecting part (312) guides the light from the light source into the first reflecting surface (311a).

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