Coulter Systems Corporation

Vivitar Corporation

Eotron Corporation

Zygo Corporation

Optigon Research & Development Corporation

John A Lawson

Lysle D Cahill

John C Butler

E Raymond Thomas

Ronald J Duke

Kenneth D Fraser

John L Tibbits

John F Keane

Theodore A Kessis

Stanley C Harting

George H Kramer

Gary L Frank

Ellis I Betensky

Joseph D Knox

Manfred R Kuehnle

Richard Sutera

Brian N Wilcox

Larry E Price

Danny Potts

Paavo Loosberg

William W Marshall

Luke L Talley

Lawrence C Calhoun

Robert G Wolfe

A light beam scanning device and method comprises a first input source for providing a scanning light beam and a flat stationary scanning surface to be scanned by the beam. An f sine theta lens system focuses the light beam onto the flat stationary scanning surface. A galvanometer mirror provides for repetitively scanning the light beam across the flat stationary scanning surface in a first fast scan direction while a pivoting mirror provides for receiving the light beam and scanning it onto the galvanometer mirror in a second slow scan direction perpendicular to the first direction. The cooperative operation of the galvanometer mirror and the pivoting mirror raster scan the light beam onto the flat stationary scanning surface. A second light source generates a reference light beam which is directed onto a rear mirror surface of the galvanometer mirror from which it is directed to a nonlinear grating having line spacing proportional to 1/(sine theta) for defining the position of the scanning beam in the first direction. The grating is scanned by the reference beam as is reflected from the galvanometer mirror and passes from the grating to a detector for generating a control signal representative of the position of the scanning light beam in the first direction. The grating may be reciprocally moved relative to the galvanometer mirror to compensate for distortion of the image scanned in the flat stationary scanning surface.

Flat stationary field light beam scanning device

A scanning device for causing a beam of light to be repetitively swept across a surface includes a laser source for providing a beam of laser light and a pentaprism assembly which redirects the beam of light to the surface. The pentaprism assembly includes a support member and a plurality of pentaprism elements positioned around the periphery of the support member. An arrangement is provided for rotating the support member such that successive ones of the plurality of pentaprism elements are brought into the path of the beam of light and redirect the beam of light to the surface. Movement of each pentaprism element while intersecting the beam of light causes the beam of light to sweep across the surface. The scanning device may also be used without a laser source to scan ambient light which is reflected from a surface and direct the light to a detector.

Multiple pentaprism scanning device and method

A unitary magnification lens system for an electrophotographic imaging system including a folded optical system is made of synthetic resin. It has an f/5.6 aperture for increased light gathering power to ease the requirements of the imaging system illumination system and a moderately wide field angle of 64.degree. to image documents of up to 81/2.times.14 inches at a time. The lens system is non-vignetting and includes aspherical surfaces on its four elements, arranged in two pairs, that deviate to as much as the tenth order from the conic.

Synthetic resin lens system for imaging apparatus

Graphics and text data are combined selectively to discharge incremental areas of a charged electrophotographic member to form thereon a latent text and/or graphics image represented by the graphics and text data, the imaged member thereafter being toned and output from the system so that the toned image may be fused on the member and the member may be used as a printing plate in an offset lithographic printing press. The apparatus includes an optical system that may form a maximum of 22 individual rays which are deflected twice through a field flattening lens and then onto the charged member. The optical system further includes an optical scale or grating which provides electrical signals indicating the precise location of the individual rays along scan lines on the member. The apparatus further includes an electronic system which generates electrical signals from the graphics and text data to form the 22 individual rays. The text data is used to modulate signals produced by the graphics data, the result of the modulation being beam control signals used to form the 22 individual rays. The apparatus further includes a toning system that provides a vertical meniscus of toning fluid, the meniscus being essentially stationary with the electrophotographic member as the electrophotographic member is rotated past the toning station.

Digital plate maker system and method

A digital plate maker system to receive graphics and text data and selectively discharge incremental areas of a charged electrophotographic member to form thereon the latent images represented by the graphics and text data, the imaged member thereafter being toned and output from the system. Thereafter, the toned image may be fused on the member and the member being used in an offset lithographic printing press. The digital platemaker system includes an optical system which may form a maximum of 22 individual rays which are direct deflected twice through a field flattening lens and then onto the charged member. The optical system further includes an optical scale or grating which provides electrical signals indicating the precise location of the individual rays along scan lines on the member. The digital plate maker system further includes an electronic system which generates electrical signals to form the 22 individual rays. The text data is used to modulate signals produced by the graphics data, the result of the modulation being the beam control signals used to form the 22 individual rays. The digital plate maker system further includes a toning system which provides a vertical meniscus which is essentially stationary with the electrophotographic member as the electrophotographic member is rotated past the toning station.

Optical system for imaging an electrophotographic member

A flat bed scanner system for optically sensing a transparent original image and producing three channels of binary digital data representing the densities of the original image. Each channel produces data in response to one sensing color and sensing of the original image occurs by directing a focused image of a beam of white light onto and across the original image in a pattern of parallel scan lines there being a plurality of sensing positions along each scan line, and producing the digital output data in response to the modulated beam of light transmitted by the original image. There is an optical system which provides for the directing of the beam of white light across the original image and which directs the modulated beam onto sensors. The optical system includes color correction and field flattening of the beam of white light and provides a cylinder condenser lens for the modulated beam of white light. An electronic system receives signals from the sensors and converts them into the desired digital data through analog to digital and logarithmic conversion circuits, base line correction circuits and references compensation circuits. The electronic system also provides a sample clock signal synchronizing the locations of the sensing beam with the locations of the sample positions by way of an optical grating system. An electromechanical system is provided to maintain the optical system in focus from scan line to scan line on both the original image and the optical grating system.

Flat bed scanner system and method

A zoom lens having a wide field angle and two movable groupings to vary the equivalent focal length, the front grouping comprising a front positive group, a negative group comprising a plurality of negative elements, and a rear positive group. In zooming the rear grouping moves forward to increase the equivalent focal length while the front grouping moves backward to maintain the image plane. The front grouping is independently movable for focusing.

Zoom lens

This disclosure relates to a Wide Angle Lens of the retrofocus type having a new lens group arrangement which comprises from the object end to the image end a first negative group, a second negative group in the form of a meniscus having a concave image side surface, a third positive group having a convex object side surface, a fourth positive group having a convex image side surface, a fifth negative group, and a sixth positive group having convex image and object side surfaces.

Wide angle objective

A wide angle lens of the retrofocus type comprising six lens groups in front and rear groupings. The rear grouping is movable forward while the front grouping is stationary to focus the lens to within ten equivalent focal lengths of the lens.

A two-element lens which provides an emerging beam of a height H from the optical axis where H is proportional to the product of the focal length of the lens and an angle made by an incident beam emanating from the focal point of the lens on the optical axis thereof.

Growing community of inventors

Dayton, OH, United States of America

John A Lawson