HITACHI-LG DATA STORAGE, INC.

A battery stand is configured to output an electric power stored in a battery to the outside when the battery is placed on a mounting part. A slit hole is formed on the top surface of the battery stand through which a slider is inserted and through which a movement range of the slider is regulated. The battery stand is linked to the movement of the slider and is equipped with a holding mechanism to secure the battery. The battery stand is equipped with a shielding member that shields the slit hole. The shielding member is attached to the slider and moves with the slider while maintaining the slit hole shielded.

Provide a module that can improve heat dissipation efficiency. The module has a housing and an electronic component mounting board that is housed in the housing and has a semiconductor device and a board on which the semiconductor device is mounted. In the module, a first metal layer formed on an inner surface of a first face part of the housing and the housing side surface of the semiconductor device are in contact. In the module, a stacked part in which the first metal layer and a second metal layer are stacked is formed on at least a part of a second region between an outer edge of a first region including the contact surface between the first metal layer and the housing side surface of the semiconductor device and an outer edge of an inner surface of the housing.

According to the invention, a light guide plate-type video display device and a video display system that are capable of displaying a video with less color deviation and less video distortion are provided. A video display device 101 configured to display a video includes a video projection unit 200 configured to project video light, a video deflection unit 210 , and a light guide portion 230 . The video deflection unit 210 deflects video light emitted by the video projection unit 200 and causes the video light to propagate to the light guide portion 230 , and the light guide portion 230 causes the entered video light to propagate therein and outputs the video light. Here, the video deflection unit 210 or the light guide portion 230 is configured to reduce color dispersion of the video light outputted from the light guide portion 230.

A head-mounted display achieves both miniaturization and high efficiency of an optical system and expansion of an eye box. In order to achieve the above-described object, a head-mounted display that displays an image within a visual field of a user is provided. The head-mounted display includes: an image display unit that generates an image to be displayed; a projection unit that projects image light from the image display unit; an image rotation and replication unit that expands an eye box of projection light from the projection unit; and a waveguide unit that transmits image light from the image rotation and replication unit to a pupil of the user. The image rotation and replication unit includes an incidence surface, an emission surface, and at least two reflection surfaces, and an angle formed by the incidence surface and the emission surface is greater than 90°.

The light-guide plate includes a substrate, an incidence diffraction grating that diffracts incident light, and an emission diffraction grating that emits light from the substrate, the light being diffracted by the incidence diffraction grating. The emission diffraction grating is formed of a recessed/projected pattern formed on a substrate surface, the recessed/projected pattern includes a first group of parallel straight lines and a second group of parallel straight lines intersecting the first group of parallel straight lines, and a pitch of the first group of parallel straight lines is equal to a pitch of the second group of parallel straight lines. A relationship between the pitch P of the first group of parallel straight lines and the second group of parallel straight lines and a pattern width W of the recessed/projected pattern is defined as W/P, which is 0.15 or more and 0.85 or less.

A smartphone system for vehicle includes a key authentication device and a wireless charging device having a memory unit in which copy authentication information, which is authentication information for a copy of master authentication information held by a smartphone, is stored. The smartphone key system for vehicle selects and uses as the authentication information any of the master authentication information transmitted by wireless communication from the smartphone to a key authentication device and the copy authentication information stored in the memory unit, depending on a state of charging operation for the smartphone.

At a preparatory step for correction, in a state that a reflective tape made with a retroreflective material is pasted in advance onto a floor surface of a measurement space in a direction away from the distance-measuring device, a distance La to an inside area of the reflective tape, and a distance Lb to an outside area of the reflective tape adjacent to the inside area are measured by the distance-measuring device, while measurement positions Y are being scanned along the reflective tape. A correction formula for converting the distance Lb to the distance La is created from a relationship between the distance La and the distance Lb obtained at each measurement position Y. At an actual measurement step, a distance (actual measurement value x) to the target object measured by the distance-measuring device is corrected in accordance with the correction formula, and a measurement-distance corrected value y is calculated.

A distance measurement device comprises an irradiation unit that irradiates a measurement light onto an object to be measured, a light receiving sensor that receives reflected light from the object to detect an exposure amount based on the reflected light, a memory unit that stores correction information indicating a correction formula set including a plurality of correction formulas and an applicable distance range of each correction formula, and a distance calculation unit that calculates the measurement distance to the object to be measured based on the exposure amount. The distance calculation unit performs, based on the correction information stored in the memory unit, a distance correction calculation to calculate a corrected measured distance by correcting the measured distance using the correction formula corresponding to the applicable distance range in which the measured distance is included among the plurality of correction formulas in the correction formula set.

A head mounted display displays an image in the user's field of vision and includes a video display unit that generates the image to be displayed. A first waveguide and a second waveguide duplicate the video light from the video display unit. Each of the waveguides includes a pair of parallel main planes that confine video light by internal reflection. The first waveguide includes an incident surface that reflects video light into the inside and two or more outgoing reflective surfaces emit video light into the second waveguide. The second waveguide includes an input unit that couples video light from the first waveguide to the inside and an output unit that emits video light to the user's pupil, wherein the angle between the duplication direction of video light in the first waveguide and the duplication direction of video light in the second waveguide is less than 90°.

The head-mounted display includes: an image display unit that generates an image to be displayed; and a first light guide plate and a second light guide plate which duplicate image light from the image display unit. Each of the first light guide plate and the second light guide plate includes a set of parallel main surfaces confining the image light with internal reflection, the first light guide plate includes an incident plane that reflects the image light to an inner side, and two or more emission/reflection planes from which the image light is emitted to the second light guide plate, the second light guide plate includes an input part that couples the image light transmitted from the first light guide plate to the inner side, and an output part from which the image light is emitted to a user's pupil.