摘要:
An optical head is used in a magnetic field modulation type magnetooptical recording/reproducing apparatus. The optical head includes a device for irradiating a magnetooptical record medium with a light beam, a separating device for separating a reflected light beam from the magnetooptical record medium into two beams to be projected onto a single plane, a single photodetector provided with two two-divided light receiving portions for respectively receiving the two beams, and a single convex lens element for forming images of the two beams as light spots on the single photodetector.
摘要:
Provided is a plug detachment prevention structure, such that when a plug equipped with a plug terminal and a plug retaining section that covers a part of the plug terminal is connected to a jack provided inside a housing, the plug detachment prevention structure retains the plug retaining section to prevent the plug from detaching from the jack, wherein the plug detachment prevention structure is equipped with a ring-shaped elastic section composed of an elastic material in which the plug retaining section is pressure-inserted, and a frame section that is circularly mounted at an outer circumferential side of the elastic section, composed of a material harder than that of the elastic section and detachably attached on an outside of the housing.
摘要:
A magneto-optical information reproducing apparatus includes a device for irradiating a light beam polarized in a predetermined direction onto a recording medium having information magnetically recorded thereon, a device for splitting a reflected or transmitted light beam from the medium, polarization-modulated by a magneto-optical effect in accordance with the information into a first light beam for generating a servo signal and second and third light beams polarized orthogonally for generating a reproduced signal, and a detection device for detecting the three split light beams. The splitting device is arranged such that the three light beams exit in substantially the same direction and the directions of polarization of the second light beam and the third light beam make an angle of 45 degrees with respect to the predetermined direction of polarization of the irradiated light beam.
摘要:
A defect detecting apparatus including an illumination system for radiating a light of a plane wave linearly to a substrate having repetitive patterns of different pitches; a focusing optical system for focusing a light image reflected from the substrate thus illuminated by the illumination system; a spatial filter disposed intermediate the focusing optical system so as to shield a diffraction light from repetitive patterns of a small pitch on the substrate; a detector for detecting the light image formed by the focusing optical system; an erasing means for comparing and erasing signals which are generated on the basis of repetitive patterns of a large pitch and obtained through the spatial filter, out of signals detected by the detector; and a defect detecting means for detecting defects on the substrate in accordance with a signal detected by the detector, as well as a method applied to the said apparatus.
摘要:
Method and apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on the medium. The apparatus includes a device for irradiating the medium with a light beam, a device for causing relative reciprocal movement between the medium and the light beam, and a device for terminating or displacing the light beam on the medium, after the lapse of a predetermined period of time from a moment when the relative speed of the medium and the light beam is reduced below a predetermined speed. The method includes the steps carried out by the apparatus.
摘要:
A functional optical element comprises a first optical member, a second optical member provided in contact with said first optical member, the interface between said first optical member and said second optical member being non-flat planar, a means for changing the refractive index of said second optical member, said means for changing refractive index being capable of creating selectively a first state in which said first optical member and said second optical member have an equal refractive index and a second state in which said first optical member and said second optical member have different refractive indices by changing the refractive index of said second optical member.
摘要:
In an image recording apparatus for recording images by modulating a light beam by information signals and applying the light beam to a recording medium, the longitudinal mode of the light beam is multiple, that is, comprises a plurality of oscillation wavelengths.
摘要:
An optical element having the function of changing the cross-sectional intensity distribution of an incident light beam is comprised of a plurality of prisms. The optical element spatially combines a light beam having been amplitude-divided by an amplitude-dividing mirror provided on the joined surface of the prisms and a light beam having been totally reflected by a total-reflection mirror provided on the outermost one of the prisms to thereby change the cross-sectional intensity distribution of the light beam entering the optical element.
摘要:
A scanning optical system having a tilting correcting function includes a light beam generator, a deflector for deflecting the light beam from the light beam generator in a predetermined direction, a first optical system disposed between the light beam generated and the deflector for linearly forming the light beam from the light beam generator near the deflecting and reflecting surface of the deflector, and a second optical system disposed between the deflector and a medium to be scanned for imaging on the medium the light beam deflected by the deflector. The second optical system includes, in succession from the deflector side, a spherical single lens and a single lens having a toric surface. The product of the curvature of the surface of the spherical single lens which is adjacent to the deflector and the curvature of the surface of the spherical single lens which is adjacent to the medium to be scanned is zero or less.
摘要:
Provided is a plug detachment prevention structure, such that when a plug equipped with a plug terminal and a plug retaining section that covers a part of the plug terminal is connected to a jack provided inside a housing, the plug detachment prevention structure retains the plug retaining section to prevent the plug from detaching from the jack, wherein the plug detachment prevention structure is equipped with a ring-shaped elastic section composed of an elastic material in which the plug retaining section is pressure-inserted, and a frame section that is circularly mounted at an outer circumferential side of the elastic section, composed of a material harder than that of the elastic section and detachably attached on an outside of the housing.