摘要:
In the optical pickup device, a luminous flux emitted from a blue-violet laser as S wave to a blue-violet PBS, passes through a half-wave plate, and is reflected by the blue-violet PBS and a total reflection mirror, before being applied to a BD disc via an objective lens. Luminous fluxes, which were emitted respectively from an infrared laser emitting device and a red laser emitting device and were reflected respectively by infrared and red PBSs, among aligned infrared, red and blue-violets PBSs, before reaching the blue-violet PBS, are reflected by the blue-violet PBS. The luminous fluxes emitted from the blue-violet laser emitting device as P waves pass the blue-violet PBS, and are respectively applied to a CD disc, a DVD disc, or a HD-DVD disc via an diffractive object lens. Thus, it becomes possible to write or read access to four kinds of discs with three wavelengths.
摘要:
An optical pickup device has a semiconductor laser emitting light which is in turn branched via a diffraction grating into at least three beams of light including a main beam and two sub beams which are in turn condensed via an objective lens on an optical disk at a guide groove and reflected by the optical disk to provide three reflections of light which are in turn received by detectors, each divided into two regions, respectively, to generate a tracking error signal. The diffraction grating is divided into three regions including a first region, a second region and a third region located intermediate therebetween, each having a periodical structure out of phase, the periodical structure having grating grooves in a direction determined depending on the phase of the second region to incline relative to a direction perpendicular to the guide groove of the optical disk.
摘要:
An optical pickup device has a semiconductor laser emitting light which is in turn branched via a diffraction grating into at least three beams of light including a main beam and two sub beams which are in turn condensed via an objective lens on an optical disk at a guide groove and reflected by the optical disk to provide three reflections of light which are in turn received by detectors, each divided into two regions, respectively, to generate a tracking error signal. The diffraction grating is divided into three regions including a first region, a second region and a third region located intermediate therebetween, each having a periodical structure out of phase, the periodical structure having grating grooves in a direction determined depending on the phase of the second region to incline relative to a direction perpendicular to the guide groove of the optical disk.
摘要:
A radiographing apparatus according to an aspect of the present invention is characterized in that an image processing device comprises an acquisition device which acquires projection data of a first energy spectrum and projection data of a second energy spectrum, and a synthetic image generating device which synthesizes a first image on the basis of the projection data of the first energy spectrum, and a second image on the basis of the projection data of the second energy spectrum according to a predetermined synthetic condition, and generating a synthetic image, and a display device displays the generated synthetic image.
摘要:
An optical pickup apparatus and a drive apparatus having the same are provided. Second light-receiving elements or third light-receiving elements for receiving ±first-order diffraction light beams from a polarization hologram are arranged outwardly of a circular region having the optical axis of a zero-order diffraction light beam on a light detector as its center, a radius of which is expressed by (2×t/n)×(f2/f1), where f1 denotes a focal length of an objective lens, f2 denotes a focal length of a coupling lens, t denotes a maximum value of a light transmitting layer thickness, n denotes a refractive index of a light transmitting layer.
摘要:
In the X-ray CT apparatus of the present invention, the setting device sets X-ray irradiation condition candidate by at least one combination of a tube current and tube voltage for power to be supplied to the X-ray source by the use of an X-ray absorption coefficient of said scanning subject site of the object, and the control device makes the display device selectably display each of the set X-ray irradiation condition candidates which is provided for a diagnosis of a requested tissue of the object, to take control such that a tomographic image of the object is taken according to the selected X-ray irradiation condition candidate. According to the X-ray CT apparatus of the present invention, it is possible to set a scanning condition in view of absorption or transmission of X-rays specific to and different among each tissue of an object.
摘要:
A tomograph which determines projection data phase range capable of back projection for each reconfigured voxel with an arbitrary value larger than π so that the absolute values of cone angles at the ends of this phase range is minimized, calculates an approximate straight line for a curve indicating the position of a radiation source with respect to the channel direction position of parallel beam projection data obtained by a parallel beam of a parallel shape viewed from the go-around axis direction generated from the radiation source, and based on the determined projection data range capable of back projection, three-dimension back projects the parallel beam projection data subjected to filter processing created through a filter correction to the back projection region corresponding to the region in concern along the approximate irradiation trace of the radiation beam calculated using the calculated approximate straight line, thereby suppressing generation of the distortion attributed to data discontinuity, simplifying an arcsin calculation and significantly increasing the processing speed of the tomograph.
摘要:
In an X-ray CT apparatus comprised with an X-ray generating means, an X-ray detector disposed opposing to the X-ray generating means, a rotating means for rotating the X-ray generating means and the X-ray detector on a circular orbit of a same rotation center, a control means for controlling so as to irradiate X-rays from the X-ray generating means to an object laid along the rotation center and to detect by the X-ray detector X-ray dose penetrated through the object while rotating the X-ray generating means and the X-ray detector through the rotating means and a reconstruction computing means for performing reconstruction computation by making use of the data of the penetrated X-ray dose obtained under the control of the control means and acquiring a tomographic image, the X-ray CT apparatus further being comprised with an input means being inputted of information with respect to an target tissue of the object to be discriminated in the tomographic image and of an index with respect to correctness of the discrimination, and a scanning condition determining means for determining scanning conditions for discriminating the target tissue based on the index inputted by the inputting means.
摘要:
A coin processor according to the present invention includes a temporary storage portion that temporarily stores coins, and the temporary storage portion includes: a conveyor belt; a one side conveyor guide that is disposed on one edge side of the conveyor belt in a width direction thereof; an other side conveyor guide that is disposed on an other edge side of the conveyor belt in the width direction with a spacing narrower than a diameter of a coin to be stored between the one side conveyor guide and the other side conveyor guide, and that slopes upward toward outside in the width direction; a drive portion that drives the conveyor belt; and a stacking surface guide that is provided at one end portion of the conveyor belt in a lengthwise direction thereof, and that slopes upward toward outside of the conveyor belt in the lengthwise direction.
摘要:
An optical pickup includes a hologram element. The hologram element is provided with a hologram pattern including a splitting section for focus which splits light used for the detection of an FES and a splitting section for tracking which splits light used for the detection of a TES. The splitting section for tracking is formed in a region excluding a region interposed between a first virtual straight line and a second virtual straight line. The first virtual straight line is drawn on the hologram element in parallel to an X direction and passes through an optical axis of reflected light entering the hologram element in a state where the objective lens is in a neutral position, and the second virtual straight line is drawn in parallel to the first virtual straight line, while being spaced at a distance d from the first virtual straight line.