Eastman-kodak Company

Donald DeJager

David D Kessler

Andrew Frederick Kurtz

Thomas A Mackin

Seung H Baek

Seung-Ho Baek

Leslie G Moore

Anna L Hrycin

The present invention is directed to a laser printer including a printer controller, a printhead including a plurality of lasers formed in an array for receiving modulating image data from the printer controller, a variable magnifying means such as a zoom lens, and a drum on which a receiver member is mounted on which an image is to be printed. The printer controller is arranged to selectively use any one of a set of predetermined microdot matrixing values and a separate sub-microdot matrix associated therewith, and distribute image data to the plurality of lasers based on such microdot and sub-microdot matrixing values. The variable magnification means (e.g., a zoom lens) applies optical magnification or demagnification to light beams from the array of lasers to provide selective variable microdot matrixing values between the predetermined microdot matrixing values of the set. Therefore, any dot density between a low and a high microdot matrix value of the set of predetermined microdot matrixing values is produced using combinations of microdot and sub-microdot matrixing by the printer controller and variable magnification of the zoom lens.

Variable dot density printing system using sub-microdot matrixing and a

A high aperture finite conjugate lens suitable for use in applications requiring high numerical aperture on both object and image sides of the lens such as laser thermal printer system.

High aperture finite conjugate lens system suitable for use as a micro

A high aperture finite conjugate lens suitable for use in applications requiring high numerical aperture on both object and image sides of the lens such as in a laser thermal printer system. The lens system has six lens components, the first lens component is identical to the sixth lens component but is reversed in orientation; and the third lens component is identical to the fourth lens component, but is reversed in orientation.

High aperture finite conjugate lens system

A thermal printer system using a multiple line scanning printhead with a micro relay lens system having high numerical apertures on both object and image sides.

Thermal printer system with a high aperture micro relay lens system

An apocromatic relay system suitable for use in a high definition telecine apparatus comprising two groups of lens components with approximate symmetry about an aperture stop, as in a basic double gauss configuration plus one or two additional lens components located at the front of the first group of lens components and/or at the rear of the second group.

Apochromatic relay lens systems suitable for use in a high definition

An f-.theta. lens is disclosed which is particularly suitable for use with a color laser printer in which beams of different wavelengths are combined into a single combined beam. The combined beam is scanned by a rotating polygon onto a receiving medium. The f-.theta. is adapted to operate with optics for shaping the beam in a scan direction prior to the polygon and a cylindrical element after the f-.theta. lens to image the beam in a cross-scan direction onto the receiving medium. In order to provide an f-.theta. lens which is color corrected, the lens includes means for correcting in a scan direction for lateral color aberrations in each of the beams, and means for correcting in a cross-scan direction for axial color aberrations in each of the beams.

F-.theta. lens

An illumination system for a film scanner is disclosed which comprises a light source and optics for providing a line of light on a film. Light transmitted through the film is imaged onto photosensor elements such as CCD arays. In order to obtain a high quality electronic image, a xenon light source is used, color filters are included in the system to control the spectral content of the light provided to the film gate, and an integrating cylinder is used to provide a line of diffuse light on the film.

Illumination system for a film scanner

A beam splitter for color imaging apparatus is disclosed. The beam splitter comprises two prism elements which are joined together with a dichroic interference filter interposed between the two elements. An input beam to the beam splitter is divided into a first output beam which is reflected from the filter and a second output beam which is transmitted through the filter. In order to provide a beam splitter of a generally triangular cross section in which one of the output beams has the desired spectral content for a luminance channel in the imaging apparatus and the other output beam has the desired spectral content for a chrominance channel, the interference filter is formed of alternate layers of SiO.sub.2 and TiO.sub.2 and is disposed such that an input light beam to the beam splitter has a relatively small angle of incidence on the filter.

Beam splitter for color imaging apparatus

An optical scanner is disclosed for scanning a light beam onto a receiving medium. The scanner includes a rotatable polygon for receiving a light beam from a source and for scanning the beam through a predetermined angle, and optical elements between the polygon and receiving medium for directing the beam to the receiving medium. In order to provide a very high resolution scanner which can be used to generate half-tone images, the optical elements include a first lens element having two spherical surfaces, a second lens element which has orthogonal cylindrical surfaces, and a cylindrical mirror.

Optical scanner

An optical scanner is disclosed for scanning a light beam onto a receiving medium. The scanner includes a rotatable polygon for receiving a light beam from a source and for scanning the beam through a predetermined angle, and optical means between the polygon and receiving medium for directing the beam to the receiving medium. In order to provide an optical system which produces the desired results at the image plane and is relatively simple to manufacture, two spherical lenses and a cylindrical mirror are interposed between the polygon and receiving medium.

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Rochester, NY, United States of America

Donald DeJager