摘要:
An optical directional coupler of the invention has a first surface which is formed at the one end of a first or second graded index type light transmission body and which is perpendicular to the optical axis of the light transmission body, and also has a plurality of second surfaces which are formed at parts of the one end of the light transmission body which are different from the first surface. The light which is transmitted from a first optical fiber through the first surface is further transmitted through the second light transmission body, and then becomes incident on a second optical fiber. The light which is transmitted from the first optical fiber through the second surfaces is further transmitted through the second light transmission body and then becomes incident on a plurality of third optical fibers.
摘要:
Provided are an optical disc discrimination method, an optical disc device and an integrated circuit that enable to accurately discriminate the type of an optical disc. The optical disc discrimination method comprises a first seeking step (S3) of performing a seek operation to a predetermined reference address in a user data area; a second seeking step (S5) of performing a seek operation from the reference address sought in the first seeking step (S3) to a predetermined target address in a physical information area, an address reading step (S7) of reading a current address at a position sought in the second seeking step (S5), and an optical disc type determination step (S8 through S10) of determining the type of the optical disc loaded in the optical disc device, based on the current address read in the address reading step (S7).
摘要:
Fibrous basic magnesium sulfate-containing pellets comprising an olefin polymer and fibrous basic magnesium sulfate in a weight ratio of 80:20 to 20:80 and further comprising a nucleating agent in an amount of 0.3 to 8 weight parts based on 100 weight parts of the olefin polymer and in an amount of 0.2 to 4 weight parts based on 100 weight parts of the fibrous basic magnesium sulfate are favorably employable for producing molded fibrous basic magnesium sulfate-containing propylene polymer products which show high flexural modulus, high flexural strength and high yield strength in tension as well as excellent thermal stability.
摘要:
Fibrous basic magnesium sulfate-containing pellets comprising an olefin polymer and fibrous basic magnesium sulfate in a weight ratio of 80:20 to 20:80 and further comprising a nucleating agent in an amount of 0.3 to 8 weight parts based on 100 weight parts of the olefin polymer and in an amount of 0.2 to 4 weight parts based on 100 weight parts of the fibrous basic magnesium sulfate are favorably employable for producing molded fibrous basic magnesium sulfate-containing propylene polymer products which show high flexural modulus, high flexural strength and high yield strength in tension as well as excellent thermal stability.
摘要:
The invention provides a tracking control device, a tracking control method, and an optical disc apparatus that enable to stably perform the tracking control, and reduce an influence of stray light from the other layer on the tracking control. A sub push-pull signal correcting section corrects a sub push-pull signal to be generated from returning light of a sub beam in such a manner that a track crossing component of a main push-pull signal to be generated from returning light of a main beam, and a track crossing component of the sub push-pull signal to be generated from the returning light of the sub beam are canceled. A low pass filter reduces a high frequency component of the sub push-pull signal corrected by the sub push-pull signal correcting section. A subtractor subtracts a sub push-pull signal passing the low pass filter from the main push-pull signal to thereby generate a tracking error signal.
摘要:
An optical disc apparatus of the present invention includes an optical head (103) including a lens disposed at a position shifted from a traverse axis in a tangential direction, a traverse motor (104) as a second moving unit that moves the optical head (103) in a direction traversing tracks of the optical disc (101), a number-of-tracks calculating part (123) that calculates, as the number of tracks to be sought, the number of tracks that the optical head will traverse when moving from a first address to a second address of the optical disc (101), a tracking-drive-signal-at-seek generating part (112) and a traverse-drive-signal-at-seek generating part (119) as seek controlling units that move a convergent point of an optical beam from the first address to the second address, and a number-of-tracks correcting part (124) that corrects the number of tracks to be sought according to a shift amount of the lens from the traverse axis.
摘要:
After an optical disk drive according to the present invention has been loaded with an optical disk and before the operation of recognizing the type of the given disk is finished, the drive presumes one of multiple types of candidate optical disks, from/on which data is readable and writable using a light beam with the shortest wavelength among the candidate disks, to be the disk being driven by the motor now and gets the beam for the presumed type of disk radiated from a light source (Step (A)). Next, the drive gets the disk spun at a rotational velocity that realizes a linear velocity equal to or higher than a standardized normal velocity when data is read from the presumed type of disk (Step (B)). Thereafter, the drive starts a focus control in a situation where the spot of the beam being formed on the disk is moving on the disk at the linear velocity equal to or higher than the normal velocity (Step (C)). And then the drive performs the operation of recognizing the type of the disk by the light beam reflected from the disk under the focus control (Step (D)).
摘要:
An optical disc apparatus of the present invention includes an optical head (103) including a lens disposed at a position shifted from a traverse axis in a tangential direction, a traverse motor (104) as a second moving unit that moves the optical head (103) in a direction traversing tracks of the optical disc (101), a number-of-tracks calculating part (123) that calculates, as the number of tracks to be sought, the number of tracks that the optical head will traverse when moving from a first address to a second address of the optical disc (101), a tracking-drive-signal-at-seek generating part (112) and a traverse-drive-signal-at-seek generating part (119) as seek controlling units that move a convergent point of an optical beam from the first address to the second address, and a number-of-tracks correcting part (124) that corrects the number of tracks to be sought according to a shift amount of the lens from the traverse axis.
摘要:
A light emitting unit comprises a light emitting element, a light emitting element substrate for mounting the light emitting element, and a light emitting element substrate frame member provided with a window for exposing the light emitting element, wherein the inside of the window is sealed with a first resin and a second resin, the ratio of the second resin relative to the first resin becomes smaller toward the outside of the window from the inside thereof. The first resin is a transparent resin, and the second resin is a colored resin with a high color value or a resin including a light reflective material and/or a light scattering material. Since a sectional border line between the first resin and the second resin is a curved line, the light reflected from the bottom section of the window among the light emitted from the light emitting element can also be efficiently emitted to the outside.