Abstract: The present invention relates to a semiconductor laser device on which a high-frequency signal can be superposed without radiating said high-frequency signal externally. Said device consists of a semiconductor laser element mounted directly or indirectly through a semiconductor substrate on a comb-frame, and an outer frame made of an insulation material provided at an area surrounding said comb-frame on which said semiconductor laser chip is mounted; and this device is fixed on a printed circuit board with a through-hole allowing a direct pass of laser light emitted from said semiconductor laser device. Said printed circuit board is provided with a high-frequency circuit and is lined with a metal film layer on the rear surface of said printed circuit board or within said printed circuit board.

Abstract: An optical head for optical recording and reproducing apparatuses is disclosed. The optical head comprises a semiconductor laser, a mirror for reflecting a light beam emitted from the semiconductor laser, a diffraction grating for dividing the light beam into zero order, plus and minus first-order beams. It also comprises a holographic diffraction grating being arranged at an optical path of the beams divided by the diffraction grating, an objective lens for focusing the beams on a disk and causing the beams reflected from the disk to be incident on the holographic diffraction grating to diffract the beams, and a photodetector for detecting a tracking error signal by receiving the beams diffracted by the holographic diffraction grating. The semiconductor laser has a beam incident area onto which the beam reflected from the disk is incident. The beam incident area acts to scatter or absorb the incident beam. As a result, the optical head is able to obtain a stable tracking error signal.

Abstract: A magnetic material with an improved maximum energy product useful for high performance permanent magnet, bond magnet and other applications is disclosed. The magnetic material is expressed in a general formula R1.sub.x R2.sub.y M.sub.100-x-y where R1 is at least one element selected from the rare earth elements, R2 is at least one element selected from elements having an atomic radius in a range of 0.156 to 0.174 nm, M is at least one element selected from Fe and Co and x and y are atomic percent individually defined as x.gtoreq.2, y.gtoreq.0.01 and 4.ltoreq.x+y.ltoreq.20, and M occupying 90 atomic percent or more in the principal phase of the compound.

Abstract: A diffraction element includes a diffraction grating for dividing a light beam, emitted from a light source along a predetermined path, into a principal light beam and at least two auxiliary light beams, and a hologram for separating the beam, which has been reflected from an optical information recording medium, from the predetermined path. The diffraction grating and the hologram are integrated together by being formed in alignment with each other in opposite portions of a block of glass or plastics. A slide is provided at at least a portion of the diffraction element and includes a peripheral wall in sliding engagement with a cylindrical surface coaxial with an optical axis of the diffraction element to permit the diffraction element to be rotatable about the optical axis.

Abstract: A method of performing anisotropic etching more than once with respect to a semiconductor substrate (1) is provided with the steps of performing first-time anisotropic etching by using a first etching mask (2) so as to form a first anisotropically etched region (4) which is hollow, forming a second etching mask (7) over the first etching mask (2), performing second-time anisotropic etching by using the second etching mask (7), and previously forming the first etching mask (2) from a material which is resistant to an etchant used for patterning the second etching mask (7) before the first-time anisotropic etching is performed. Thus, the edge portion (6) of the first etched region (4) is protected so that its configuration is excellently maintained.

Abstract: A radiant ray CT for reconstructing an image at a high effective rate, high resolution, and high picture quality with a shortened scan time and thus with less exposure. The apparatus comprises a source of radiant ray, such as an X-ray, and a group of detectors disposed in confronting relation with a reconstructive region for accommodating a body to be examined interposed therebetween, wherein scanning is performed according to spatial and timing controls of the radiant ray generating positions so that each of the radiant ray transmitting paths is interpolated with one another substantially at the center of the reconstructive region between adjacent or neighboring view data groups and between confronting view data groups each corresponding to each of the adjacent or neighboring view groups.

Abstract: The present invention provides an apparatus for carrying out tomography which is arranged in such a manner that a radiation source and a multichannel radiation detector are rotated about a subject to be examined, the radiation source disposed so as to generate a fan beam of radiant rays such as X-rays, the multichannel radiation detector having an offset arrangement and disposed in opposition to the radiation source with the subject being interposed therebetween; the fan beam of radiant rays being applied in the direction parallel with a chosen section of the subject; the chosen section of the subject being measured in a plurality of directions parallel therewith so as to obtain data representative of the distribution of the intensity of transmitted radiant beams; and an image of the section of the subject being thereby reconstructed on the basis of data having an array corresponding to the fan beam.

Abstract: An apparatus for Fourier Transform which achieves a spatial frequency multiplication without involving an increase in the operation time. The apparatus has a memory (MM) for storing data obtained by sampling. The Fourier transform of the data stored in this memory is undertaken by circuitry that performs Fourier transform functions (ADD, MUL, HM1, HM2, TBM) without adding 0's to the data, and is simultaneously written to a plurality of memories (M1, M2, M3, M4) at corresponding relative addresses. A series of addresses is specified through these memories (M1-M4).

Abstract: A weatherproof system for cargo containers has therein an outwardly open lengthwise channel or groove formed in each of two opposing side edges of a floor panel 1, and the lower portion of one of four side panels is disposed immediately outward of the groove in such a way that a water trapping chamber is defined between the lengthwise groove and the lower portion of the side panel. The bottom surface of the water trapping chamber thus defined is in substantially coplanar relationship with an adjacent seat surface which supports thereon the bottom edge of each of the side panels, and the upper wall of the water trapping chamber is extended outwardly so as to define a water drip or barrier means. Therefore, rain or sea water flowing along the intersurface between the floor panel and each of the side panels is entrapped in the water trapping chamber and consequently prevented from further flowing into the interior of the container.

Abstract: A refrigerator car includes a freezing container mounted on a chassis, a refrigeration unit mounted on one side of the chassis under the floor of the freezing container, a power unit mounted on the other side of the chassis under the floor, and means for transmitting power from the power unit to the refrigeration unit. The refrigeration unit is communicated with the freezing container for the passing of cooling air.