Abstract: A cooling device includes a circulation channel through which a refrigerant is circulated, a heat receiving part which is disposed in the circulation channel and in which the refrigerant receives heat generated by a heat generating component, a heat dissipating part which is disposed in the circulation channel and in which the refrigerant dissipates the heat received in the heat receiving part, a pump which is disposed in the circulation channel and which sends the refrigerant to the heat receiving part, and a tank which is coupled to the circulation channel and which has a space therein, wherein the tank is disposed at a higher position in a vertical direction than the pump in a state where the pump is located on an upper side in the vertical direction with respect to the heat receiving part and the heat dissipating part.

Abstract: A cooling device includes a circulation channel through which a refrigerant is circulated, a heat receiving part which is disposed in the circulation channel and in which the refrigerant receives heat generated by a heat generating component, a heat dissipating part which is disposed in the circulation channel and in which the refrigerant dissipates the heat received in the heat receiving part, a pump which is disposed in the circulation channel and which sends the refrigerant to the heat receiving part, and a tank which is coupled to the circulation channel and which has a space therein, wherein the tank is disposed at a higher position in a vertical direction than the pump in a state where the pump is located on an upper side in the vertical direction with respect to the heat receiving part and the heat dissipating part.

Abstract: A radiator includes a tube that has a flattened-shape, the tube including an internal flow channel that allows a coolant to flow through the internal flow channel; and a tank that includes an insertion port into which a joint end portion of the tube is inserted so that the tank and the tube are joined to each other, wherein the tube includes an outer-peripheral-wall extending in a direction perpendicular to a thickness direction of the tube, and bend depressions that are bent toward the internal flow channel in a concave shape are formed in at least a region of the outer-peripheral-wall adjacent to the joint end portion, the bend depressions extending along the internal flow channel, and the bend depressions are deformed in a width direction of the tube so that the width of the joint end portion is the same as the width of the insertion port.

Abstract: A heat-receiver includes: a first plate that receives heat at one face from a heat generating body; a second plate that is disposed facing another face of the first plate with a spacing therebetween, and that has a greater plate thickness than a plate thickness of the first plate; a first coupling portion that couples together the first plate and the second plate; and a second coupling portion that couples together the first plate and the second plate at a position that faces across the first plate toward the heat generating body, with a gap between the second coupling portion and the first coupling portion through which a coolant is capable of passing, and that has a width along the other face of the first plate that is greater than a width of the first coupling portion, as viewed along the coolant passing direction.

Abstract: A cooling module includes: a heat exchanger mounted on an electronic part mounted on a board, and that cools the electronic part; a leaf spring including an overhang portion and an extension portion, the overhang portion overhanging outward beyond the heat exchanger from the heat exchanger, and the extension portion extending from the overhang portion in a direction intersecting an overhang direction of the overhang portion when viewed in a thickness direction of the board; and a support member located around the heat exchanger, and fixed to the board, the extension portion bent toward the board being attached to the support member.

Abstract: A cooling unit includes a radiator, a rigid supply pipe connected to the radiator, and a refrigerant that is air-cooled by the radiator flows, a plurality of open nozzles provided at the supply pipe to correspond to the respective plurality of heat-generating components, a plurality of heat receiving units that are mounted to the respective plurality of heat-generating components and connected to the respective open nozzles, and allow a refrigerant supplied from the open nozzles to flow through internal channels, and a plurality of return pipes each of which is provided for each of the heat receiving units and joined to the heat receiving unit, and returns the refrigerant discharged from the heat receiving unit to the radiator, wherein the respective heat receiving units are connected to the supply pipe to be relatively displaceable, and the respective return pipes are connected to one another in series and relatively displaceably.

Abstract: A radiator includes a tube that has a flattened-shape, the tube including an internal flow channel that allows a coolant to flow through the internal flow channel; and a tank that includes an insertion port into which a joint end portion of the tube is inserted so that the tank and the tube are joined to each other, wherein the tube includes an outer-peripheral-wall extending in a direction perpendicular to a thickness direction of the tube, and bend depressions that are bent toward the internal flow channel in a concave shape are formed in at least a region of the outer-peripheral-wall adjacent to the joint end portion, the bend depressions extending along the internal flow channel, and the bend depressions are deformed in a width direction of the tube so that the width of the joint end portion is the same as the width of the insertion port.

Abstract: A heat-receiver includes: a first plate that receives heat at one face from a heat generating body; a second plate that is disposed facing another face of the first plate with a spacing therebetween, and that has a greater plate thickness than a plate thickness of the first plate; a first coupling portion that couples together the first plate and the second plate; and a second coupling portion that couples together the first plate and the second plate at a position that faces across the first plate toward the heat generating body, with a gap between the second coupling portion and the first coupling portion through which a coolant is capable of passing, and that has a width along the other face of the first plate that is greater than a width of the first coupling portion, as viewed along the coolant passing direction.

Abstract: A cooling unit includes a radiator, a rigid supply pipe connected to the radiator, and a refrigerant that is air-cooled by the radiator flows, a plurality of open nozzles provided at the supply pipe to correspond to the respective plurality of heat-generating components, a plurality of heat receiving units that are mounted to the respective plurality of heat-generating components and connected to the respective open nozzles, and allow a refrigerant supplied from the open nozzles to flow through internal channels, and a plurality of return pipes each of which is provided for each of the heat receiving units and joined to the heat receiving unit, and returns the refrigerant discharged from the heat receiving unit to the radiator, wherein the respective heat receiving units are connected to the supply pipe to be relatively displaceable, and the respective return pipes are connected to one another in series and relatively displaceably.

Abstract: A magnetic recording medium used for the thermally assisted magnetic recording system which fires a laser beam at a magnetic recording medium to partially heat the medium and applies a magnetic field from the outside to the part heated to lower the coercivity for recording. The magnetic recording medium is configured by a glass substrate on which a heat radiation layer, heat retention layer, intermediate layer, and recording layer are stacked. Further, the heat retention layer is configured by a member having an effective refractive index lower than the effective refractive index of the recording layer and having an temperature diffusion coefficient determined by the specific heat, density, and heat conductivity rate higher than glass and lower than metal. The material with a high temperature diffusion coefficient is used lowered in temperature diffusion coefficient using a porous structure or granular structure.

Abstract: An optical device includes a clad composed of a material having a first refractive index, a core which is embedded in the clad, composed of a material having a second refractive index different from the first refractive index, and tapers toward the end-point thereof, and a light-transmitting layer which is composed of a material different from the material having the second refractive index and cuts across an optical path at the end-point thereof.

Abstract: A magnetic recording medium used for the thermally assisted magnetic recording system which fires a laser beam at a magnetic recording medium to partially heat the medium and applies a magnetic field from the outside to the part heated to lower the coercivity for recording. The magnetic recording medium is configured by a glass substrate on which a heat radiation layer, heat retention layer, intermediate layer, and recording layer are stacked. Further, the heat retention layer is configured by a member having an effective refractive index lower than the effective refractive index of the recording layer and having an temperature diffusion coefficient determined by the specific heat, density, and heat conductivity rate higher than glass and lower than metal. The material with a high temperature diffusion coefficient is used lowered in temperature diffusion coefficient using a porous structure or granular structure.

Abstract: A head suspension assembly comprising: a head suspension; a head slider having the medium-opposed surface opposed to a storage medium, the head slider having the supported surface received on the head suspension, the supported surface being defined at the farside of the medium-opposed surface; an electromagnetic transducer embedded in the medium-opposed surface of the head slider; a light waveguide incorporated in the head slider, the light waveguide extending from the supported surface to the medium-opposed surface; and an optical element interposed between the supported surface and the head suspension, wherein the optical element defines: a light-collecting surface configured to collect light input into the optical element in parallel with the supported surface; and a light-reflective surface configured to reflect the light at a predetermined angle so as to direct the light to the light waveguide.

Abstract: A head slider is used for magnetic record by irradiating a recording medium with tiny spots of light. The head slider includes a slider main body having a bottom surface facing a recording medium and a top surface opposite to the bottom surface, an optical head provided in the slider main body to irradiate the recording medium with light and an optical layer to propagate light supplied from outside and lead the light to the optical head. The optical layer is curved along a curved surface formed in a portion of the slider main body to form a curved propagation path of light.

Abstract: A near-field light emitting device includes a deflecting unit that deflects electromagnetic waves propagated through a core toward a base. A propagating unit arranged on the base emits near-field light from an outlet. By providing a magnetic head on a side opposite to the base, a distance between the magnetic head and an intensity center of the near-field light can be minimized. The deflecting unit is formed comparatively thick, therefore, the electromagnetic wave is caused to enter the propagating unit at such an angle that causes a surface-propagating wave to be generated highly efficiently.

Abstract: A multilayer optical recording medium including a first recording layer for recording or reproducing information by using a first light beam having a center wavelength ?1, a first photochromic layer provided on the first recording layer, and a first optical waveguide layer provided on the first photochromic layer for guiding to the first photochromic layer a second light beam having a center wavelength ?2 different from the center wavelength ?1. The multilayer optical recording medium further includes a second recording layer provided on the first optical waveguide layer for recording or reproducing information by using the first light beam, a second photochromic layer provided on the second recording layer, and a second optical waveguide layer provided on the second photochromic layer for guiding the second light beam to the second photochromic layer. The first and second photochromic layers become transparent to the first light beam by irradiation with light or by application of heat.

Abstract: In a magnetic recording device, a semiconductor laser (LD) is disposed at a position with a predetermined distance from a swing arm having a slider. The laser beam output from the LD is irradiated, via a beam converter and a mirror, to a spherical aberration lens that generates spherical aberration. The laser beam transmitted through the spherical aberration lens is directed to a light incident opening of the slider at a constant angle (perpendicularly), and then to a position of a recording medium at which information is recorded, thereby performing thermal assist at the magnetic recording time.

Abstract: An optical device includes a clad composed of a material having a first refractive index, a core which is embedded in the clad, composed of a material having a second refractive index different from the first refractive index, and tapers toward the end-point thereof, and a light-transmitting layer which is composed of a material different from the material having the second refractive index and cuts across an optical path at the end-point thereof.