Abstract: A piezoelectric speaker includes a casing and cover member having a transverse wall extending therebetween which forms a sound transmission channel having a spiral curved or double reverse bend shape and being of substantially continuously increasing cross sectional area between an inlet portion of said channel and an outlet opening to atmosphere. A driver element comprising a diaphragm formed of fiber reinforced epoxy, polyester or ABS resin has a piezoelectric ceramic disk secured thereto and supported in a recess formed on the cover member. A sound transmission opening in the cover member communicates with the inlet portion of the sound transmission channel. The diaphragm may be formed integral with the cover member. The speaker has the capability of expanding the frequency band width of audible sound at relatively high sound pressure levels.

Abstract: An air conditioner is provided and includes a louver which is provided at a blowing opening. The louver is moved rotationally from above to below or from below to above by a variable speed mechanism. At the time of heating, a louver rotational speed while the louver is moved rotationally in a range of a blowing angle .theta..sub.1 is set to a speed .omega..sub.1 within a vortices generation area relative to a wind velocity of blowing air flow. Also, a louver rotational speed while the louver is moved rotationally over the blowing angle .theta..sub.1 is set to a speed .omega..sub.1 within a vortices non-generation area relative to the wind velocity of blowing air flow. Thereby, at the time of heating, downward reach of warm air in a room while the louver is moved rotationally below the predetermined blowing angle and a temperature diffusibility while the louver is moved rotationally above the predetermined blowing angle are improved.

Abstract: A cryogenic cooling apparatus is provided, wherein the degree of freedom of installation and use is increased without deteriorating the reliability or stability and the range of uses of the apparatus is also increased. A coil unit and a refrigeration unit are positioned such that a second heat conductive member disposed on an extendible wall of a vacuum container and a fourth heat conductive member disposed on an extendible wall of another vacuum container face each other coaxially. In this state, the coil unit and refrigeration unit are relatively moved to approach each other, and thus the second heat conductive member and fourth heat conductive member come in contact. If the coil unit and refrigeration unit are further moved, the extendible wall extends and consequently the second heat conductive member comes in contact with a first heat conductive member. In addition, the extendible wall contracts and consequently the fourth heat conductive member comes in contact with a third heat conductive member.

Abstract: A magneto-optical data recording system comprises magnetic field pulse applying means for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and means for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying means applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating means continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying means includes a magnetic coil driven by code data from a source of code data (data generator).

Abstract: A superconducting magnet apparatus comprises a superconducting coil unit, and a refrigerant-filled chamber type refrigerator having a plurality of cooling stages. At least a final cooling stage of the cooling stages includes a static-type refrigerant-filled chamber and is associated with the superconducting coil unit, and at least a first cooling stage of the cooling stages includes a movable-type refrigerant-filled chamber.

Abstract: In a magneto-optical disk for recording, reproduction or erasing with a laser beam, which comprises a film of four-layer structure consisting of a first dielectric layer, a magneto-optical recording layer, a second dielectric layer and a metallic layer, laid on a disk substrate provided with guide tracks, temperature distribution of the magneto-optical recording layer is controlled by controlling the thermal diffusivity of the metallic layer, and recording/reproduction/erasing repetition characteristics are improved thereby. In the disk of the present structure, the temperature is elevated in a broader area from the center of laser beam, and thus a thoroughly broad erasing domain width taking a track offset into account can be obtained and no recording domains remain after the erasing.

Abstract: A recording mark having width (disk radius direction) larger than length (disk rotation direction) is formed by using the light intensity modulation method. The recording mark is ring-shaped. The ring part differs in optical characteristic from a part surrounded by the ring part. In order to form a ring-shaped mark, laser light having predetermined intensity is continuously radiated onto the recording medium. By modulating the intensity of the laser light, information is overwritten. The ring-shaped mark is set to have a width based upon the intensity of radiated laser light and the characteristic of the recording film.

Abstract: A photosensitive resin composition for producing a relief printing plate is disclosed, which comprises a polymer selected from the group consisting of a prepolymer, a binder polymer and a mixture thereof, an ethylenically unsaturated monomer, a specific hindered amine and a photopolymerization initiator. Even when the photosensitive resin composition is excessively irradiated with strong actinic rays in order to cure the resin composition to its inner portion sufficiently, the surface of the resin composition does not undergo photodeterioration by virtue of the hindered amine contained therein, thereby imparting excellent toughness to the photocured resin composition throughout the entire thickness thereof. Thus, a relief printing plate having excellent printing resistance can be produced.

Abstract: A magneto-optical data recording system comprises magnetic field pulse applying apparatus for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and apparatus for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying apparatus applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating apparatus continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying apparatus includes a magnetic coil driven by code data from a source of code data (data generator).

Abstract: A magneto-optical data recording system comprises magnetic field pulse applying apparatus for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and apparatus for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying apparatus applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating apparatus continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying apparatus includes a magnetic coil driven by code data from a source of code data (data generator).

Abstract: A cryogenic refrigerator includes a first refrigerant filled in a final refrigerating force storage chamber on a high temperature side thereof and consisting essentially of a composition expressed by (a) (Er.sub.(x) R.sub.(1-x)).sub.3 Ni.sub.(y) Co.sub.(1-y), or (b) Er.sub.(x) R.sub.(1-x) Ni.sub.(y) Cu.sub.(1-y) wherein 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.1, and R denotes a rare earth element selected from the group consisting of Y, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, Yb and Sc, a second refrigerant filled in the final refrigerating force storage chamber on a low temperature side thereof and consisting essentially of a composition expressed by (f) Er.sub.(x) R.sub.(1-x) Ni.sub.(y) Co.sub.(1-y), or (g) (Er.sub.(x) R.sub.(1-x)).sub.3 AlC.sub.(y) wherein 0.ltoreq.x.ltoreq.1, 0.ltoreq.y.ltoreq.

Abstract: An information recording medium includes an information recording layer on which at least information is to be recorded by irradiating light, and a light transmission restricting layer which has a plurality of nonlinear transmission characteristics or nonlinear reflection characteristics for the intensity of the light irradiated and which has an optical material for restricting the transmission or reflection of the light according to the respective characteristics when the light is irradiated onto the information recording layer. An information recording and reproducing unit uses the information recording medium and includes an information recording position setting unit for deciding a position at which information is to be recorded on the information recording medium by detecting a direction of an easy magnetization axis.

Abstract: A short-wavelength laser having a stable output and an optical information processing system capable of high-density recording are disclosed. A solid-state laser is used as a light source, and a nonlinear optical crystal is arranged in a resonator in order to produce a short wavelength by means of a solid-state laser. The retardation of the nonlinear optical crystal is controlled by determining the length of the nonlinear optical crystal. A solid-state laser device having a stable output with the noise removed from a pumping power light source is also provided. Further, the solid-state laser device is used as a light source for the optical information processing system, and the light of irrelevant wavelengths contained in the light from the solid-state laser device are removed by a device having the ability to select wavelengths. Thus, not only a stable light source with a short wavelength but also an optical information processing system capable of high-density recording are realized.

Abstract: By using an information recording medium comprising at least a substrate and an information recording film which is mounted on the above substrate and changes the physical property under irradiation of a recording energy beam, wherein the surface of the information recording area of the above substrate is uneven, both surfaces of the above recording film are also uneven, and an inorganic protective layer is provided in contact with the surface of the above recording film opposite to the above substrate, fine recording points can be formed stably without complicated control of the recording power and recording waveform so that an optical disk unit can record data simply in high density.

Abstract: A cryostat housing an ultra-low temperature medium includes a container for storing the ultra-low temperature medium, a pipe for communication between the inner and outer sections of the container, at least one tubular member interposedly arranged inside the pipe between the pipe and an opening, a heat anchor section for cooling the pipe, and a plate-shaped member positioned so that a gas layer of the ultra-low temperature medium inside the tubular member divides the tubular member longitudinally.

Abstract: A magneto-optical recording device for radiating a laser beam according to recording information onto a magneto-optical recording medium having an easy axis of magnetization in a direction perpendicular to a film face of the recording medium itself to form a reversed domain and record information, which forms a reversed domain by radiating a laser beam and moves the position of the reversed domain to record information. In an embodiment of the present invention, it becomes possible to over-write new information without erasing beforehand information already recorded by only controlling the intensity, pulse width, radiation position and radiation time of the laser beam without providing a special bias magnetic field for reversing the magnetic field.

Abstract: An optical disk head having a short wavelength light source has an aperture diaphragm placed in the course of its focusing optical system which can change its aperture diameter depending on the pit size on an optical disk in order to allow recording on and reproducing from not only a short wavelength optical disk, but also a long wavelength optical disk. The aperture diameter is made larger for the smaller pit size and vice versa, and the light source output is adjusted depending on the aperture diameter so that the light amount coming from the disk surface to a photodetector cannot be changed with the aperture diameter.

Abstract: A magnetic field of a polarity corresponding to information to be recorded is applied while a recording spot having a high energy is irradiated to a magneto-optical recording medium to record domains representing the information along a track. The recorded domains are read out by a reproducing spot having a lower energy than the recording spot and a high resolution power along the track.

Abstract: A magneto-optical data recording system includes magnetic field pulse applying apparatus for applying to a magneto-optic recording medium a magnetic field pulse of a polarity corresponding to code data to be recorded, and a heating apparatus for heating the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to be recorded. During recording, the magnetic field pulse applying apparatus applies a magnetic field pulse of a polarity corresponding to code data along a track of the recording medium and the heating apparatus continuously heats the recording medium in a pulsating manner at a predetermined frequency synchronous with the code data to thereby directly overwrite the code data. The magnetic field pulse applying apparatus includes a magnetic coil driven by code data from a source of code data (data generator).

Abstract: A magneto-optical recording medium having a magnetic film having magnetization normal to a plane thereof and having a number of prepits preformed in an optically detectable form at a predetermined interval along a track is prepared. Areas between the prepits are defined as recording areas in which data is to be recorded. A clock signal having a predetermined frequency is generated in synchronism with a reproduced signal corresponding to the prepits of the magneto-optical record medium in response to the reproduced signal. A radiation pulse having an energy corresponding to a signal having a predetermined pattern is irradiated to the magneto-optical record medium in accordance with the clock signal to record the predetermined pattern in at least one of the recording areas prior to code data to be recorded. A phase difference (.delta..sub.2) between the reproduced signal corresponding to the recorded predetermined pattern and the clock signal is detected and a difference (.delta..sub.1 -.delta..sub.