Abstract:
A brushless direct current motor with the rotating magnet cup (43) permanently attached to the spindle hub (11). After attachment, the combination spindle hub and magnet cup are affixed to a shaft (10) and the resulting subassembly is dynamically balanced. The motor using this balanced subassembly is assembled with no balancing required after assembly. The motor can also be disassembled for repair and reassembled without disturbing the dynamic balance. The motor is especially useful for disk drive applications.
Abstract:
A system and method for organizing data on a removable optical disk. The surface area of the disk is divided into concentric data bands (12, 13, 14), each comprising sufficient disk surface area upon which a large number of concentric data tracks may be written. Concentric servo tracks (16, 17, 18), wider than the data tracks, are used to separate adjacent data bands. Each data band utilizes one data track (62) as an address track upon which data identifying the particular data band is pre-written. One data band (60) is set aside as an index band into which indexing information, identifying what data is written in each band, may be written. A desired data record or file can be quickly accessed by first using the index band to identify the address of the band where the desired data is located, and then by directly and rapidly accessing the identified band.
Abstract:
An automatic load/unload apparatus (1) for handling of workpieces that must be removed from protective cartridges prior to use. In particular, the workpiece to be handled is an optical disk adapted for use in an optical disk information storage device. The load/unload apparatus includes a guide frame (2), a cartridge pull-in tray (3), a cartridge insert separator (4), reciprocating means (35) for moving the pull-in tray and separator, and an elevator assembly (5). During a load operation, the cartridge (15) is inserted into the information storage device wherein the load/unload apparatus is housed. The cartridge is received in the guide frame and opened, allowing the pull-in tray to be slidably removed. The disk is separated from the pull-in tray and raised by the elevator assembly to a desired position. An unload operation proceeds in a reverse sequence.
Abstract:
A linear detector (61) for use in a coarse positioning servo system of an optical system. The linear detector produces an error signal having an amplitude linearly proportional to the distance that a relatively narrow strip of light energy (63) falls on a collection surface (62) of the detector as measured relative to a fixed reference point on said collection surface. Two reference signals (65, 66) are derived from circuitry associated with the collection surface. A frist reference signal (65) has an amplitude proportional to the intensity of the focussed light energy and the location that said light energy falls on the collection surface relative to a first reference point. A second reference signal (66) has an amplitude proportional to the intensity of the focussed light energy and the location that said light energy falls on the collection surface relative to a second reference point. The sum and difference of the amplitudes of the first and second reference signals are derived to produce sum and different signals, respectively. The difference signal is divided by the sum signal to produce the desired error signal (67), which error signal has an amplitude that is substantially independent of the intensity of the focused light energy.
Abstract:
A flexible hub for a disk (2). The disk includes a relatively large center hole into which a flexible planar member (6) is mounted or clamped. The size of the flexible member is slightly larger than the hole, thereby requiring that the flexible member be slightly bowed or flexed in order for it to fit within the hole. The flexible member is preferably attached to the disk at three respective qui-angularly spaced locations (40) around the periphery of the hole. In the center of the flexible member is a collar (7) adapted to receive a protruding spindle neck (28) from a spindle mechanism upon which the disk is mounted. The end of the spindle neck and the inside wall of the collar are tapered at the same angle. Insertion of the spindle neck into the colar thereby forces alignment or centering of the center of the collar with the longitudinal axis (8) of the spindle neck.
Abstract:
A system and method for generating a unique sync pattern that may be appended to a selected data sector of a disk storage system (20). The data to be stored in the disk storage system is encoded in accordance with a desired fixed rate run-length limited code, such as a 2-7 code. The unique sync pattern is generated by first encoding a prescribed data word (BF7A) in accordance with the desired code. At least one bit of the encoded prescribed data word is then changed in a manner such that the changed encoded word still complies with the coding rules of the desired code, yet the resulting bit pattern does not represent any valid sequence of data in accordance with the desired code. Hence, the changed encoded word may be readily distinguished from data using sync detect logic (204), thereby providing the synchronization function, while still being handled and processed by the same encoding/decoding circuitry (136, 137) as is employed to handle and process the data.
Abstract:
An in-line anamorphic light beam expanding/contracting device utilizing two prisms (1, 3) and a planar mirror surface. The planar mirror (2) surface reflectively directs the optical path of a light beam between the two prisms and the prisms provide light beam expansion by refracting. The device allows for a diminutive device which is especially useful in computer peripheral optical data storage equipment.
Abstract:
A dichroic beam splitter (13) design comprising a single unit assembly having a reduced number of components to provide for diminished weight and bulk, simplicity of alignment, greater optical efficiency and fewer steps in the assembly process to produce the device. The beam splitter includes two identical right triangular prisms (14, 17), a parallelogram shaped element (15), and a trapezoidal shaped element (16), all bonded together to form the single, L-shaped, beam splitter (13). High reliability, and ease of identification of component elements due to unique geometry, is provided by this approach. This device is especially useful for computer optical disk storage devices.
Abstract:
An optical disk drive system with which data may be permanently and correctly stored on removable media. The system includes a drive (20) into which the media, a disk (44) housed in a cartridge (32), my be removably inserted. The drive interfaces with a host CPU (22) through a storage control unit (24), which storage control unit may also have other peripheral devices, such as magnetic disk drives (18), coupled therethrough to the host CPU. A special data format is used for data stored on the disk in order to provide efficient use of and acces to the available storage space. The disk (44) is divided into data bands, each data band having a prescribed number of concentric data tracks therein. Each data track is divided into equal length sectors. The data is organized into data blocks, each block being made up of a selected sequence of prescribed data sections. Many of the data sections commence with synchronization bits followed by the data to be stored. The data of each data section is adapted to fit within each data sector on the disk. When data is written in any given sector, it is immediately checked for correctness by reading the data that has been written and comparing it with the data was to have been written. Defectively written data is flagged so that it can be skipped over and ignored during subsequent reads. Data in a given sector is rewritten until it is written correctly.
Abstract:
A preformatted diagnostic information recording disk (1) for use in an optical disk storage and retrieval device for allowing the disks upon which user data is recorded to be used to provide diagnostic information to the device for the automatic performance of diagnostic routines in order to verify proper device operation. The preformatted disk has a plurality of information tracks (4a, 4b, 4c, ...) each having a specific data pattern designed to test for a specific device function. In the preferred embodiment parameters tested include high frequency data recording (track 4a), low frequency data recording (track 4b), rapid variation data recording (tracks 4d, 4e, 4f), DC offset compensation (track 4c), clocking/data recording signal isolation (tracks 4h - 4l), galvo centering verification (track 4p), rapid access functioning, read spot alignment (tracks 4m - 4n), and read/write functioning (area 5).