公开(公告)号：US3501670A

公开(公告)日：1970-03-17

申请号：US3501670D

申请日：1969-01-14

Applicant: IBM

Inventor： JOHNSTON DAVID L ,  SIVERLING MICHAEL M ,  WILSON MELVIN G

IPC: H04N3/16 ,  H04N3/20 ,  H01J29/70

CPC classification number: H04N3/20

公开(公告)号：FR2410850A1

公开(公告)日：1979-06-29

申请号：FR7830415

申请日：1978-10-19

Applicant: IBM

Inventor： BURKE MICHAEL J ,  SIVERLING MICHAEL M ,  WILFINGER RAYMOND J

IPC: G06K9/38 ,  H04N1/407 ,  G06G9/00

Abstract: Analog voltage levels derived from optically scanning a document or from magnetically scanning a magnetic record, depend upon the variable amplitude of a background signal. The analog voltage levels are processed by a bucket brigade circuit to set a threshold from which a binary decision may be made as to the presence of a black or white indicium in optical recognition or a one (1) or zero (0) bit in magnetic reading.

公开(公告)号：CA1173958A

公开(公告)日：1984-09-04

申请号：CA399142

申请日：1982-03-23

Applicant: IBM

Inventor： SIVERLING MICHAEL M

IPC: G05D3/12 ,  G11B5/596 ,  G11B21/10

Abstract: SERVO SYSTEM FOR DATA STORAGE APPARATUS The servo system includes the use of servo signals of four types such that each group of four adjoining servo tracks identifies the center line of a data track of interest and presents unique signals from the respective four servo tracks. The analog value of the signals are stored and sensed to provide a substantially linear position error signal over a three-track wide region. By using variable gain with respect to the analog signals, compensation for the variance between data head width and track pitch, and a quadrature servo portion, linearity can be achieved. In addition, since the substantially linear region is three tracks wide and the position error signal does not become ambiguous over a width of four tracks, a one-track seek can be accomplished using an error signal rather than a seek.

公开(公告)号：CA1147857A

公开(公告)日：1983-06-07

申请号：CA352935

申请日：1980-05-27

Applicant: IBM

Inventor： SIVERLING MICHAEL M ,  WHEELER STEPHEN E

IPC: G11B23/50 ,  G11B33/14 ,  G11B5/82 ,  G11B23/02

Abstract: RECIRCULATING FILTER DUCT DESIGN A disk file is equipped with a recirculating filter duct utilizing the pressure differentials within an enclosure imparted by the rotating disk to induce an air flow in the duct having an inlet near the disk periphery and an outlet effectively radially inward thereof. The flow of air through this duct is enhanced by a deflector adjacent the duct outlet at the side thereof initially approached by a given point on the rotating disk and a projection approaching the opposite surface of the disk or disk pack and generally axially aligned with the deflector to equalize the forces exerted and avoid instability of disk operation. The duct is configured to eliminate eddy currents and the air volume within the enclosure is limited to increase the rate at which air changes occur. RO978-016

公开(公告)号：FR2398352A1

公开(公告)日：1979-02-16

申请号：FR7819404

申请日：1978-06-20

Applicant: IBM

Inventor： LEIGHTON HOWARD N ,  SIVERLING MICHAEL M ,  WILFINGER RAYMOND J

IPC: G06K9/38 ,  G06K9/00

Abstract: An array of optically sensitive devices senses printed matter with each device in the array producing an output signal representing a single black or white element in a multi-element picture being sensed by the whole array. These output signals are fed into an analog charge transfer shift register and passed serially in a fixed sequence through an output stage of the shift register. As the signal from each device passes through this output stage the device becomes what is hereafter referred to as the device of interest and the signal produced by it is analyzed to determine whether it is a black or white element. Other output stages simultaneously sense data from devices located around the device of interest to define a subarray within the original detected array while the last of these output stages is fed to a peak comparator to sense the brightest and darkest matter detected in the recent past by any element of the array. The results of these sensings are processed in accordance with a preselected algorithm to generate a digital signal wich is an indication of whether the device of interest has detected black or white.

公开(公告)号：CA1000408A

公开(公告)日：1976-11-23

申请号：CA160703

申请日：1973-01-04

Applicant: IBM

Inventor： BJERKE BRIAN K ,  SIVERLING MICHAEL M

IPC: B07C3/14 ,  G01N21/47 ,  G02B27/00 ,  G06K7/10 ,  G06K9/20

Abstract: An illumination provides incident radiation to a document lying in an object plane. A photodetector converts nonspecular reflections from the plane into an electrical signal. To prevent unwanted specular reflections, from plastic mail-piece windows or uneven documents, for degrading the signal-to-noise ratio, an optical diffuser is located adjacent the object plane. Both the incident and the reflected radiation pass through the diffuser, which may be a ground-glass flat.

公开(公告)号：DE2352971A1

公开(公告)日：1974-05-22

申请号：DE2352971

申请日：1973-10-23

Applicant: IBM

Inventor： SIVERLING MICHAEL M ,  WILSON MELVIN G

IPC: G06K7/10 ,  G06K9/20 ,  G06K11/00 ,  H04M1/276 ,  H04N1/401 ,  G06K9/13 ,  H01L15/00

Abstract: Light from a high frequency light source is directed onto a self-scanned photodiode array positioned to reflectively scan a document illuminated by a document light source. The differences in sensitivities of the diodes forming the photodiode array modulate the signal generated in response to the high frequency light source. The video output signal from the photodiode array includes the modulated high frequency component and the video information component varying with sensitivity. The two components are separated by high and low pass filters. The separated modulated high frequency component is demodulated to form a signal proportional to diode sensitivity. The separated video information signal varying with sensitivity is divided by the signal proportional to sensitivity to eliminate sensitivity variance from diode to diode in the video information signal.