公开(公告)号：CA1191959A

公开(公告)日：1985-08-13

申请号：CA390763

申请日：1981-11-24

Applicant: IBM

Inventor： COX GERALD L ,  MADDOX RANDALL A

IPC: G01D5/36 ,  G01D5/249 ,  G01D11/24 ,  H03M1/00

Abstract: INCREMENTAL ROTARY ENCODER A field replaceable encoder including a slotted housing having a pair of passages therethrough essentially perpendicular to the longitudinal axis of the housing, is attachable to the frame of a machine having a rotatable shaft to which the encoder is to be mounted. Attached to the housing is an accurate stationary mask, the mask having slits which are aligned with the passages in the housing. The mask includes an accurately dimensioned aperture for locating the mask, and thus the housing, on a bearing on the rotatably mounted shaft. A pair of light sources and a pair of light detectors are mounted on opposite sides of the housing aligned with the passages and slits in the mask. A huh, to which is attached a rotating disc, is connected to the rotating shaft, the disc being mounted in the slotted housing so that interdigitated opaque and transparent portions align with the slits of the mask, and thus the light sources and light detectors. In the preferred embodiment, the light sources are mounted in the passages (tunnel like in formation) which converge at their outlets and which prevents having to employ collimated light sources while inhibiting cross-talk between the detectors and adjacent sources allowing for close spacing of the source pair and the detector pair.

公开(公告)号：CA1191925A

公开(公告)日：1985-08-13

申请号：CA425598

申请日：1983-04-11

Applicant: IBM

Inventor： MADDOX RANDALL A ,  RUDOLPH JOSEPH W

IPC: G01D5/36 ,  G01B21/02 ,  G01P3/486 ,  H03M1/00 ,  G08C21/00

Abstract: MODULAR SHAFT ENCODER Disclosed is an optical encoder structure which is easily attached to a motor case and shaft in either the factory or field, and which automatically achieves, by its construction, both axial and radial alignment. This is achieved by first securing to a housing by a novel latch, a mounting plate which is spaced a predetermined distance from the housing. A rotatable encoder disc, having a conically shaped hub is placed in an aperture in the housing, the conically shaped hub serving to self center the disc radially relative to the housing. The assembly is pushed onto the motor shaft, and the disc is secured to the shaft. The plate is then attached to the motor case and the housing rotated. This moves the housing into an abutting relationship with the plate and spaces the housing a predetermined distance from the disc. Thus the disc is both axially and radially positioned, no instruments being required to accurately position the housing with respect to the disc or motor. Moreover, so that no electrical adjustment is necessary in either the field or in the factory, the aperture for the mask or slits of the stationary member of the optical encoder and the transparent or slit openings on the rotating member are made equal to the period of the rotating disc pattern divided by two. This creates a half-wave rectified analog waveform which in conjunction with direct feedback of the voltage created by the analog waveform to control the code cycle, operational amplifier saturation is inhibited.

公开(公告)号：FR2327579A1

公开(公告)日：1977-05-06

申请号：FR7626307

申请日：1976-08-25

Applicant: IBM

Inventor： MADDOX RANDALL A

IPC: F21V7/07 ,  F21V7/08 ,  F21V7/09 ,  F21V9/04 ,  F21V13/08 ,  G03B27/54 ,  G03G15/04 ,  H04N1/028

Abstract: An illumination system of particular use in document copiers wherein an incandescent lamp which may be of the tungsten-halogen type is located at the focal point of a reflector shaped as a conic section such as elliptical cylinder, directing light rays toward an interference filter for separating the IR radiation and redirecting the IR rays back to the incandescent lamp for heating the lamp. Both cold mirror and hot mirror embodiments of the system are disclosed.

公开(公告)号：CA1171517A

公开(公告)日：1984-07-24

申请号：CA354501

申请日：1980-06-20

Applicant: IBM

Inventor： KANTOR SHERWOOD ,  MADDOX RANDALL A ,  YOSIM PAUL S

IPC: H04N1/387 ,  G06K9/32 ,  G06T1/00 ,  H04N1/00 ,  H04N1/047 ,  H04N1/10 ,  H04N1/113 ,  H04N1/19 ,  H04N1/193 ,  H04N1/04

Abstract: APPARATUS AND METHOD FOR CORRECTING DIMENSIONAL VARIATIONS BETWEEN THE ARRAYS OF A MULTIPLE ARRAY SCANNER Dimensional variations, such as skew, alignment and abutment, in an array scanner are corrected by scanning and storing into a storage means an uncorrected electronic Image generated from a test pattern. Correctional factors are generated from the stored electronic image. The correctional factors are used to correct the dimensional variations in the electronic image of the test pattern and/or dimensional variations in subsequent electronic image outputted from the scanner. BO978056

公开(公告)号：CA1165159A

公开(公告)日：1984-04-10

申请号：CA373977

申请日：1981-03-26

Applicant: IBM

Inventor： GRANT DUANE E ,  MADDOX RANDALL A

IPC: G02B27/10 ,  G02B27/14

Abstract: MIRROR MULTIPLEXOR FOR LINEAR IMAGE SENSORS A multiplexing device is provided for forming multiple images of an object. The said device comprises in combination an objective plane operable to accommodate an object, and a plurality of mirrors disposed relative to an optical axis emanating from a line object disposed at the objective plane. The mirrors are operable to form a plurality of optical axes and to propagate each axis along separate optical paths. A common lens is positioned so that the optical axes associated with each optical path traverse the center of the lens; and a plurality of linear photosensitive arrays are positioned at the image plane and are operable to receive the optical image propagating along the separate optical path. BO9-79-039

公开(公告)号：CA1068244A

公开(公告)日：1979-12-18

申请号：CA262534

申请日：1976-10-01

Applicant: IBM

Inventor： MADDOX RANDALL A

IPC: F21V7/07 ,  F21V7/08 ,  F21V7/09 ,  F21V9/04 ,  F21V13/08 ,  G03B27/54 ,  G03G15/04 ,  H04N1/028 ,  G03C5/08 ,  F21V7/00

Abstract: EFFICIENT ILLUMINATION SYSTEM An illumination system of particular use in document copiers wherein an incandescent lamp which may be of the tungsten-halogen type is located at the focal point of a reflector shaped as a conic section such as elliptical cylinder, directing light rays toward an interference filter for separating the IR radiation and redirecting the IR rays back to the incandescent lamp for heating the lamp. Both cold mirror and hot mirror embodiments of the system are disclosed.