Abstract: There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus ?/NA2 defined by a wavelength ? of the first light and a numerical aperture NA of the object lens is set to ? and the maximum-surface-blur range is denoted by D, the optical-system is designed so that a use magnification ratio ? satisfies |?|??(D/?).

Abstract: The present invention relates to an optical pick, an optical drive device, and a light irradiation method capable of suppressing a generated amount of shift ?x of a spot position. The optical pickup irradiates an optical recording medium through a common objective lens which irradiates a first light for use in information recording in or information reproduction from a recording layer and a second light different from the first light, the optical recording medium includes a reference surface having a reflection film in which a position director is formed in a spiral form or the like form, and the recording layer which is provided in a layer position different from the reference surface and in which a mark corresponding to irradiation of light is formed and hence information is recorded.

Abstract: A pickup apparatus includes a light source; a light separator; an object lens that concentrates the light which penetrated the light separator on the optical recording medium; a movable lens; and a light sensing element that receives the reflected light from the optical recording medium separated by the light separator, wherein a coma aberration generated by the transverse shift of the object lens is corrected by a coma aberration which is generated by the deviation of a spherical aberration generated in an optical path from the light source to the object lens and a spherical aberration generated in an optical path from the object lens to a light concentration position on the optical recording medium which are due to the transverse shift.

Abstract: An optical drive device for performing information recording or reproduction of recorded information by formation of a mark by focusing a first light at a necessary position in a recording layer of an optical recording medium by an objective lens includes a position control unit configured to focus a second light on a reflection film, in which a position guide element of the optical recording medium is formed, through the objective lens and to enable the spot position of the second light to follow the position guide element based on the reflected light of the second light focused on the reflection film so as to control the position of the objective lens. The optical drive device further includes a first focusing unit, a first light-sensing portion, and a surface reflection light deviation amount detection unit.

Abstract: A hologram medium manufacturing method that includes disposing a first pair of master hologram media with a predetermined interval so that the first pair of the master hologram media face each other; forming a master hologram in the master hologram media by irradiating the first pair of the master hologram media with spherical wave light and reference light so that the spherical wave light and the reference light interfere with each other in the master hologram media. The spherical wave light and the reference light have a focal point between the first pair of the master hologram media. The method also includes disposing a hologram medium between the first pair of the master hologram media; and forming a hologram in the hologram medium by irradiating the first pair of the master hologram media with the reference light.

Abstract: The present invention can properly correct spherical aberration. An optical disk device (10) displaces an objective lens (18) so that the objective lens is displaced to a reference lens position as a reference. The optical disk device (10) controls an information light condensing point changing mechanism (55) so as to adjust the focus (FM) of an information light beam (LM) to a recording depth (X) at which the information light beam (LM) is to be applied in a state of the objective lens (18) being placed at a reference lens position (SL). The optical disk device (10) controls a servo light condensing point changing mechanism (35) so as to adjust the focus (FS) of a servo light beam (LS) to a servo layer (104) in the state of the objective lens (18) being placed at the reference lens position (SL).

Abstract: A microscope includes a first imaging optical system that images light beams from a cell tissue sample, a second imaging optical system having a light beam splitting element which splits a portion of the light beams from the cell tissue sample from the first imaging optical system, an imaging element which captures phase contrast images of a portion of the light beams, which have been split, from the cell tissue sample, and one or a plurality of optical elements which forms the phase contrast images on the imaging element, and a filter inserting unit that inserts an optical filter absorbing light of a predetermined wavelength into an optical path of the second imaging optical system, wherein the filter inserting unit inserts the optical filter absorbing light of a wavelength corresponding to a complementary color of a color of an observed target according to the color of the observed target.

Abstract: A microscope includes a first imaging optical system that images sample transmitted light transmitted through a sample provided on a stage, and a second imaging optical system that images a part of the sample transmitted light branched from the first imaging optical system. Here, the second imaging optical system includes a light beam branching element that branches the part of the sample transmitted light from the first imaging optical system, and has a thickness of a predetermined threshold or more, an imaging element that images a phase difference image of the branched sample transmitted light, one or a plurality of optical elements that images an image of the phase difference image of the branched sample transmitted light on the imaging element, and a filter that shields a part of the branched sample transmitted light imaged on the imaging element.

Abstract: Disclosed herein is a microscope, including: an illumination optical system; a first image creation optical system; a second image creation optical system; an illumination-field-diaphragm focus adjustment section; and a characteristic-quantity computation block, wherein the illumination-field-diaphragm focus adjustment section adjusts the image creation position for the illumination field diaphragm on the basis of the characteristic quantity computed by the characteristic-quantity computation block.

Abstract: There is provided an optical pickup including: an optical-system having an object-lens illuminating a first light for information recording or reproducing on a recording layer as a target and a second light on an optical-recording medium including a reference plane having a reflection-layer and the recording-layer at a layer position different from that of the reference-plane and on which information recording is performed through mark formation, and a focus-aligned-position-adjusting unit adjusting a focus-aligned position of the first light through the object-lens by changing collimation thereof incident to the object-lens; and a focusing-mechanism driving the object-lens in a focusing direction, wherein, when a depth of focus ?/NA2 defined by a wavelength ? of the first light and a numerical aperture NA of the object lens is set to ? and the maximum-surface-blur range is denoted by D, the optical-system is designed so that a use magnification ratio ? satisfies |?|??(D/?).

Abstract: An optical information recording medium, which is made of a resin provided with photoreactivity containing organometal compound, has a recording layer on which, after a photoreaction are brought about when predetermined initialization light is irradiated to the medium and then the resin is hardened, at a time of recording information, a recording mark is formed when predetermined recording light is condensed to the medium, and a temperature of the medium near a focal point of the recording light is increased and the organometal compound is transubstantiated, and at a time of reproducing information, the information is reproduced based on returned light according to predetermined reading light being irradiated.

Abstract: An optical information recording and reproducing device 1 irradiates initialization light L1 to an optical information recording medium 100 having a recording layer 101 made of photopolymerization-type photopolymer in advance to bring about the photopolymerization or the photocrosslinking to perform the initialization processing, and condenses a recording light beam L2c having a comparatively strong light intensity to a target position in the recording layer 101 and increases the temperature thereof to transubstantiate the target position to record a recording mark RM at the time of recording information, and condenses a reading light beam L2d having a comparatively weak light intensity to the target position and receives a returned light beam L3 having a sufficient light amount reflected by the recording mark RM at the time of reproducing information, which makes it possible to reliably record the recording mark RM and stably read out the recording mark RM.

Abstract: A pickup apparatus includes a light source; a light separator; an object lens that concentrates the light which penetrated the light separator on the optical recording medium; a movable lens; and a light sensing element that receives the reflected light from the optical recording medium separated by the light separator, wherein a coma aberration generated by the transverse shift of the object lens is corrected by a coma aberration which is generated by the deviation of a spherical aberration generated in an optical path from the light source to the object lens and a spherical aberration generated in an optical path from the object lens to a light concentration position on the optical recording medium which are due to the transverse shift.

Abstract: An optical drive device for performing information recording or reproduction of recorded information by formation of a mark by focusing a first light at a necessary position in a recording layer of an optical recording medium by an objective lens includes a position control unit configured to focus a second light on a reflection film, in which a position guide element of the optical recording medium is formed, through the objective lens and to enable the spot position of the second light to follow the position guide element based on the reflected light of the second light focused on the reflection film so as to control the position of the objective lens. The optical drive device further includes a first focusing unit, a first light-sensing portion, and a surface reflection light deviation amount detection unit.

Abstract: An information recording apparatus for recording information on a multi-layered optical information recording medium having a recording material, which changes quality according to light intensity of an irradiated light, and having an altered layer in which the recording material is already altered and a non-altered layer in which the recording material is not yet altered alternately existing in plurals is provided. The information recording apparatus includes a light source for emitting a recording light having coherency; a light path branching unit for branching a light path of the light into a first light path and a second light path; focal position control units for controlling focal positions of the light in the first and the second light path; and objective lenses for collecting the lights in the first and the second light path on the recording medium.

Abstract: An information recording apparatus for recording information on a multi-layered optical information recording medium having a recording material, which has light reaction property and which changes quality due to heat generated by an irradiated light, and having an altered layer in which the recording material is already altered and a non-altered layer in which the recording material is not yet altered alternately existing in plurals is provided. The information processing device includes a light source for emitting a recording light having a predetermined wavelength; a focal position control unit for controlling a focal position of the recording light emitted from the light source; and an objective lens, arranged at a post-stage of the focal position control unit, for collecting the recording light; wherein the recording material at the focal position is altered through heat by the recording light to record information on the recording medium as a recording mark.

Abstract: An optical information recording medium including a recording layer that can record a large amount of information is manufactured using a simple system. A single recording layer is formed by bonding two optically transparent substrates on which the first photosensitive polymer and the second photosensitive polymer are spread such that the layers of the photosensitive polymers face each other. Furthermore, since the absorptivity of light in the recording layer increases as the focal point of light for information recording moves in a depth direction, information can be recorded without decreasing the recording transfer rate of the information.

Abstract: An optical pickup includes: a light source that emits a light beam; an object lens that focuses the light beam on an optical disc having a recording layer formed of a fluorescent recording material and a reflecting section adjacent to the recording layer, the recording layer generating, according to presence or absence of a recording mark representing information, a reproduction light beam having wavelength different from that of the light beam when the light beam is irradiated thereon from the light beam, and the reflecting section reflecting the light beam; a wavelength selecting element that separates, from the reproduction light beam, a reflected light beam reflected by the reflecting section of the optical disc and having wavelength equivalent to that of the light beam; and a reflected light detector that receives the reflected light beam separated by the wavelength selecting element and generates a position detection signal.

Abstract: A hologram reconstructing apparatus is disclosed. The apparatus includes: unnecessary light removing means for causing the imaging means to receive necessary light only included in the reconstruction light; driving means for operating the hologram recording medium or a reconstruction light optical system; light detecting means for detecting the state that reconstruction light is projected to the unnecessary light removing means of the light cut by the unnecessary light removing means; and control means for obtaining the displacement of the hologram recording medium based on the information on a specific part of the projection state information detected by the light detecting means and controlling the driving means to cancel the displacement and move the hologram recording medium or the optical system.

Abstract: An optical pickup includes: a light source that emits first light; an objective lens that condenses the first light and allows it to irradiate a track having formed therein a recording mark for intercepting the first light in a uniform recording layer of an optical information recording medium; and a light receiving section that receives transmitted light which has transmitted through the track.