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 disc device that irradiates an optical beam to an optical disc including a recording layer for recording information and a positioning layer provided with a track for identifying a recording position of the information on the recording layer, includes: objective lens that converges a predetermined positioning optical beam to adjust the optical beam to a desired track on the positioning layer and converges an information optical beam that shares an optical axis with the positioning optical beam on the recording layer; moving section that moves the objective lens in a tracking direction which is substantially orthogonal to the track to make a focal point of the positioning optical beam to follow the desired track; a detection section that detects a moving amount of the objective lens to the tracking direction; and correction section that corrects a converging position of the information optical beam in accordance with the moving amount.

Abstract: An optical disc apparatus that records recording marks in a plurality of mark layers by irradiating predetermined light onto a disc-like volume type recording medium on the basis of information to be recorded is disclosed. The apparatus includes: a first focus position adjusting means for adjusting the position of a focus on which a first light beam focuses within the volume type recording medium, in the direction of an optical axis of the first light beam; a second focus position adjusting means for adjusting the position of a focus on which a second light beam focuses within the volume type recording medium, in the direction of an optical axis of the second light beam; a focus control means for controlling the first focus position adjusting means and the second focus position adjusting means; and a recording control means for forming the recording marks at the positions of respective focuses.

Abstract: An optical recording medium includes recording layers and intermediate layers. The recording layers include a diffraction grating that has a predetermined grating pitch and is obtained by alternately laminating first layers and second layers being transparent and having slightly different refractive indexes. The intermediate layers are transparent and have a larger thickness than that of the recording layers. In the optical recording medium, the recording layers and the intermediate layers are alternately laminated.

Abstract: An optical disc apparatus and a focus position control method can highly accurately record recording marks representing information on or reproduce such recording marks from an optical disc. A blue light beam is irradiated onto the target depth to be irradiated by driving an objective lens to focus a red light beam in a reflection/transmission film formed in the optical disc and displacing a movable lens, which is a focus moving section, of a relay lens. A blue light reflection region is formed as part of the reflection/transmission film and the position of the blue light reflection region where the red light focus and the blue light focus are aligned is defined as reference position. The movable lens is displaced by an arbitrarily selected quantity from the reference position according to the target depth.

Abstract: An embodiment of the present invention includes rotating an integrated disc formed by temporarily fixing an initialization reference plate to an uninitialized optical disc that is an optical disc to be irradiated with a light beam of light having a predetermined or higher intensity to record information as a recording mark. The initialization reference plate has a reference part that reflects at least a part of a servo light beam of servo light intended for servo control. The reference part contains information that indicates the position of a track of the optical disc for the recording mark to be formed on, in the form of a track of pit-and-projection pattern.

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: In an optical disk, a substrate has main data recorded in the form of a combination of pits and lands on one side thereof, and at least a reflective layer and cover layer are stacked on the substrate to cover the pits and lands on the substrate. To the optical disk, sub data is recorded in the form of marks formed by irradiating writing-power laser light to the reflective layer. The marks are formed so that reading signal level will be raised where the marks are formed while it will be lowered where the marks are formed in a counterfeit disk produced based on an authenticated disk, namely, the reading signal level where the marks are formed is different in polarity between in the authenticated and counterfeit disks. Further, in a player for the optical disk, discrimination is made between the authenticated and counterfeit disks by detecting the sub data recorded in the optical disk and judging whether the value of the detected sub data has been read at a correct polarity.

Abstract: An optical disc drive for recording and/or reading information on or from an optical disc is disclosed. The optical disc drive includes: a position controller which controls the position of the objective lens based on the position-controlling light beam reflected by the reflective surface by condensing the position-controlling light beam by the objective lens such that the position-controlling light beam is brought to a focus at a target guide position on the reflective surface corresponding to the target recording position; a tilt angle detector which detects tilt angle of the optical disc relative to optical axis of the position-controlling light beam; and a focal position corrector which makes a correction such that a focal position obtained when the information light beam is condensed by the objective lens is aligned to the target recording position according to the tilt angle.

Abstract: An optical disc apparatus includes: a rotation section to rotate an optical disc including a spiral or concentric track with a predetermined track center, with a rotational center of the optical disc as the center; a light source to emit a light beam; an objective lens to collect the light beam on the optical disc; a lens drive section to drive the objective lens in a tracking direction; a light-receiving section to receive a reflected light beam and generate a light-receiving signal; a tracking error signal generation section to generate a first tracking error signal based on the light-receiving signal; an eccentric-state acquisition section to acquire an eccentric state of the track center; a correction section to generate a corrected tracking error signal; and a drive control section to drive the objective lens in the tracking direction by the lens drive section based on the corrected tracking error signal.

Abstract: An optical disc apparatus reproducing information on the basis of a standing wave recorded on a disc-like volume type recording medium includes: a first focus position adjusting unit configured to adjust the position of a focus on which a first light beam focuses inside a recording layer inside the volume type recording medium in the optical axis direction of the first light beam; a second focus position adjusting unit configured to adjust the position of a focus on which a second light beam focuses inside the recording layer in the optical axis direction of the second light beam; a controller configured to control the first focus position adjusting unit and the second focus position adjusting unit; and first and second detectors configured to detect the first and second reproduction light beams.

Abstract: An optical information reproducing apparatus includes: an irradiation section irradiating a light beam onto an optical information recording medium, in which holes are formed along a virtual track on a recording medium, along the virtual track; a light receiving section receiving a reflected light beam when the light beam is reflected by the optical information recording medium and sequentially generating a light receiving signal corresponding to the light intensity; a detection section detecting a variation pattern appearing when a signal level of the light receiving signal changes according to the hole; and a code string generating section, when generating a code string corresponding to the signal level, generating a code corresponding to the one hole from the variation pattern if the variation pattern falls within a range and generating a code string, which includes a plurality of codes, from the variation pattern if the variation pattern exceeds the range.

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: There is provided an optical modeling apparatus that forms a model of a desired shape by sequentially forming hardened layers by irradiating a light-curable resin with light. The apparatus includes a first light source that emits a light beam for plotting on the resin, a scanning device that scans the light beam from the first light source over the resin, a second light source that emits light that irradiates one fixed region of the resin at a time, and a spatial light modulator that spatially modulates the light from the second light source to blanket-expose a specified region of the resin. The light beam from the scanning device and the light from the spatial light modulator form each hardened layer.

Abstract: The recording accuracy of information on an optical disc is increased. An information optical system (150) of an optical disc apparatus (110) enables a semiconductor laser (3) to sequentially output specific peak light (LEP) and specific slope light (LES) as an information light beam (LM) and enables the correction lens (162) to change the divergence angle of the specific peak light (LEP) so that an absorption change area (RA) by the specific peak light (LEP) can be positioned at a far position in the recording layer (101). Thus, it is possible to form an energy concentration area (RE) by the specific slope light (LES) in the vicinity of a target position (QG), and the recording accuracy of information on the optical disc (100) can be increased.

Abstract: Disclosed is an optical disc device that is able to increase accuracy in reproducing information from an optical disc. The optical disc device 10 calculates a focus error signal SFE2 and a sum signal SS1 while reciprocating an objective lens 21 in a focus direction until a distance between a focal point FS and a focal point FM1 becomes close to the depth d of a target position PG at the time of a pull-in operation, and when a trigger signal ST1 generated on the basis of the sum signal SS1 is at low level, starts focus control on the basis of the focus error signal SFE2. Therefore, focus control can start in a state where the focus error signal SFE2 curves in an S shape with sufficient amplitude.

Abstract: The present invention makes it possible to use an optical pickup in common with conventional optical disks. In a three-dimensional mark recording layer (111v) of a voluminal medium (100v), information is recorded by forming a three-dimensional record mark (RM) in the vicinity of the focus (Fb) of a blue light beam (Lb) according to the blue light beam (Lb) that is concentrated and has a light intensity equal to or larger than a predetermined intensity. The information is reproduced from the three-dimensional mark recording layer (111v) on the basis of a reproducing blue light beam (Lbr) deriving from irradiation of the blue light beam (Lb). A servo layer (114v) of the voluminal medium (100v) reflects at least part of the red light beam (Lr) which is irradiated in order to square the position of the blue light beam (Lb) in the three-dimensional mark recording layer (111v) with an arbitrary target mark position and whose wavelength is different from that of the blue light beam (Lb).

Abstract: An optical recording and reproducing apparatus is provided for recording standing wave information on an optical recording medium and reproducing standing wave information from an optical recording medium. The optical recording and reproducing apparatus includes an optical head configured to separate a laser beam emitted from a light source (1) into three beams and emit, using an objective lens (7), two beams A and B of the three separate beams into an optical disk (8) having a reflecting surface (10) from the same side of the optical disk (8) so that a focal position SF of the one laser beam A reaching the reflecting surface is the same as a focal position of the other laser beam B after returning from the reflecting surface.

Abstract: An optical disc apparatus can highly accurately record a hologram representing information on or reproduce such a hologram from an optical disc. When recording information on an optical disc 100, the optical disc apparatus controls the position of an objective lens OL1 according to the outcome of detection of a red reflected light beam Lr2 so as to make the focus Fr thereof follow a target track and it also makes the focus Fb1 of a blue light beam Lb1 agree with a target mark position by the objective lens OL1 and also the focus Fb2 agree with the target mark position by controlling the position of another objective lens OL2 according to the outcome of detection of the blue light beam Lb1 by way of the objective lenses OL1 and OL2 so as to make the focus Fb1 of the blue light beam Lb1 and the focus Fb2 of the blue light beam Lb2 agree with the target mark position and the blue light beam Lb1 and the blue light beam Lb2 interfere with each other.

Abstract: An optical information recording device includes a semiconductor laser for emitting laser light, a light irradiation section for collecting the laser light and irradiating an optical information recording medium with the laser light, and a laser controller for supplying the semiconductor laser with a laser drive current wave in pulse form. The laser drive current wave has an oscillation current value that causes a relaxation oscillation of the semiconductor laser.