公开(公告)号：CA2133246A1

公开(公告)日：1995-06-16

申请号：CA2133246

申请日：1994-09-29

Applicant: IBM

Inventor： IMAINO WAYNE I ,  ROSEN HAL J ,  RUBIN KURT A ,  STRAND TIMOTHY C ,  TANG WADE W

IPC: B41M5/26 ,  G11B7/00 ,  G11B7/007 ,  G11B7/135 ,  G11B7/1381 ,  G11B7/24 ,  G11B7/253 ,  G11B7/257

Abstract: An optical data storage system comprises a multiple data surface medium (12) and optical head. The medium (12) comprises a plurality of substrates (50, 56, 62, 68, 74) separated by a light transmissive medium (78). Data surfaces (90, 92, 94, 96, 98, 100, 102, 104) are located on the substrate surfaces. A layer of a semiconductor material is deposited onto each of the data surfaces. The thickness of the semiconductor layer determines the amount of reflectivity for each of the data surfaces.

公开(公告)号：CA2123450C

公开(公告)日：1998-09-15

申请号：CA2123450

申请日：1994-05-12

Applicant: IBM

Inventor： IMAINO WAYNE I ,  ROSEN HAL J ,  RUBIN KURT A ,  STRAND TIMOTHY C

IPC: G11B7/095 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24

Abstract: An optical data storage system uses an optical medium made of a stack of spaced-apart optical disks. Each disk in the stack is made of light-transmissive material, such as polycarbonate when the system is a CD-ROM system, and has a partially light-transmissive data layer on at least one of its faces. A focusing lens in the system focuses light to the data layers along optical paths, with each data layer corresponding to a unique optical path length. The light is focused to each data layer by reflection off adjacent data layers such that the total substrate thickness through which the light passes is the same for each optical path. In this manner, the fixed spherical aberration correction provided by the focusing lens is adequate and variable aberration correction is not necessary. By appropriate selection of reflectivities of the multiple data layers in the disk stack, it is possible to design the system so that the effective reflected light intensity from each data layer is the same, and that adjustable signal amplification is not necessary.

公开(公告)号：CA2134140A1

公开(公告)日：1995-06-16

申请号：CA2134140

申请日：1994-10-24

Applicant: IBM

Inventor： IMAINO WAYNE I ,  ROSEN HAL J ,  RUBIN KURT A ,  STRAND TIMOTHY C ,  TANG WADE W

IPC: B41M5/26 ,  G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/24 ,  G11B7/244 ,  G11B7/246 ,  G11B7/247 ,  G11B7/248 ,  G11B7/249 ,  G11B7/258

Abstract: An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces. A layer of a dye material is deposited onto each of the data surfaces. The thickness of the dye layer determines the amount of reflectivity for each of the data surfaces.

公开(公告)号：CA2123450A1

公开(公告)日：1995-01-23

申请号：CA2123450

申请日：1994-05-12

Applicant: IBM

Inventor： IMAINO WAYNE I ,  ROSEN HAL J ,  RUBIN KURT A ,  STRAND TIMOTHY C

IPC: G11B7/095 ,  G11B7/005 ,  G11B7/09 ,  G11B7/24

Abstract: The optical data storage system comprises an optical medium comprising two spaced-apart substrates having the same material thickness, each substrate having a data layer. At least one of the substrates has a data layer which is at least partially transmissive. A light source is located near a first one of the substrates. A device directs light from the source to the medium, and includes a device for focusing the light to a discrete number of focusing positions. Each position defines an optical path between the light source and a corresponding one of the data layers. Each of the two optical paths includes a passage through substrate material having a total thickness equal to three substrate thicknesses.

公开(公告)号：CA1249655A

公开(公告)日：1989-01-31

申请号：CA495681

申请日：1985-11-19

Applicant: IBM

Inventor： IMAINO WAYNE I ,  TAM ANDREW C

IPC: G01H3/12 ,  G01H13/00 ,  G01N29/04

Abstract: A METHOD AND DEVICE FOR DETECTING A SPECIFIC ACOUSTIC SPECTRAL FEATURE A method and device for detecting a narrow acoustic spectral feature in a sample as described. The method uses an electrical frequency modulated (FM) signal that is obtained from a voltage controlled oscillator. The Fourier spectrum of this wave is a main frequency fc with two small sidebands at frequencies fc+fs. This whole triplet is slowly swept in frequency by a slow sawtooth generator. The electrical signal is fed into a flat acoustic transducer; the acoustic wave is then transmitted through an acoustically active medium, i.e. the sample, and detected by another flat acoustic transducer which produces an FM signal with a superposed amplitude modulated (AM) signal if one of the sidebands overlaps an acoustic feature. This electrical signal is then demodulated to give a pure AM signal which can be phase sensitive detected by using a lock-in amplifier. By suitable adjustment of the phase setting of the lockim amplifier both the "in-phase" and "out-of-phase" signals of the detected acoustic signal can be detected.