Abstract:
A temporal pixel clock synchronization system with jitter correction for an optical scanning system having a continuously running pixel clock source, circuitry for generating timing error signals having an amplitude representing any phase error between start of scan and start of pixel count pulses and any phase error between end of scan and end of pixel count pulses and circuitry, including a switched filter circuit with two storage elements for each facet of the polygon of the system, for generating a frequency correction signal for the pixel clock source.
Abstract:
Photoelectric reader includes a reader part for moving on an original to read image data in the original and transforming the image data into electric signals and a printer part for visualizing and fixing the electric data. The reader part is provided with an operation member for regulating the range of image data area to be read.
Abstract:
A photoelectric reading apparatus comprises a linear image sensor, an optical system for causing characters or figures on the surface of paper such as an original to be imaged on the light-receiving surface of the linear image sensor, index mark means for indicating the area of the surface of the paper to be recorded to adjust such area, and a circuit for reading, of output signals produced by the linear image sensor, a signal corresponding to the area indicated by the index mark means.
Abstract:
In a handy reader/printer apparatus for reading recorded information from a desired portion of a medium to be read and printing read information on a desired portion of a medium to be printed, the apparatus has a housing having an opening in a lower surface thereof and placed on the medium to be read or printed such that the desired portion of the medium can be fitted in the opening, a reader unit, arranged in the housing, for reading the recorded information of the desired portion of the medium to be read fitted in the opening while the housing is placed on the medium, a printer unit, arranged in the housing, for printing data in the desired portion of the medium to be printed fitted in the opening while the housing is placed on the medium, a memory for storing data read by the reader unit upon operation of the reader unit, and a readout unit for reading out the storage data from the memory as the printing data to the printer unit upon operation of the printer unit.
Abstract:
A servo system for a braked accelerative transport in which a signal representing velocity of a carriage within the transport is compared to a first reference signal representing desired carriage velocity. The comparison yields an error signal which is used to adjust the brake of the transport. A hydraulic valve having an adjustable needle is used as the brake. A second selectable reference signal is provided so that the first reference signal can be bypassed when the carriage is reset at high velocity or is at reset. The valve is also bypassed on reset so that the adjusted brake mechanism is left intact on reset.
Abstract:
A light beam scanning reticle having a grid pattern with transparent portions and opaque portions alternately arranged in a light beam deflection direction and having a variable period in a direction perpendicular to the deflection direction. The grid pattern is movable in the deflection direction, and irregularity in the speed of scanning a light spot on a scanning plane is corrected with a photo-electric signal which is provided through the grid pattern.
Abstract:
A circuit is shown for use within an optical scanning system utilizing at least two scanning beams for scanning a grating and a document. A high frequency reference signal is applied to a counter which also receives the grating signal. The grating signal is delayed by a counter to assure that the grating signal has been synchronized with the reference signal. As the scan across the document hits a reference target, a picture element signal is generated which is also applied to the counter. The counter is enabled upon receipt of a positive going signal from both the reference signal and the picture element reference signal. As the reference signal is a much higher frequency than the picture element signal, any error in misalignment between the grating whose signal is synchronized with the reference signal and the target is eliminated by the high frequency reference signal. A further delay counter within the circuit eliminates errors caused by the width of the target signal. An additional counter is utilized to assure that the scan line signal is terminated at the same point after each successive scan.
Abstract:
A multiplexing electrostatic copier system employing one or more detachable portable optical reader units, each including a "memory" or recorder, that may be readily carried about by a user for temporarily recording a "video" image of a printed document or other object to be copied or reproduced. For reproducing the recorded video image, the portable units are selectively connectable to an electrostatic copy making machine at the convenience of the users to transfer the remembered or recorded "video" images to the copy machine for reproducing the stored images and preparing a hard copy of the original document, e.g. a printed copy document on paper. The copier machine may also provide an advanced visual display of each of the transferred "video" images, enabling the users to initially observe the images before the hard copies are made.
Abstract:
In a radiant energy beam scanning system, a detector, positioned at a predetermined position along the path scanned by the beam, for sensing the center position of the power distribution within the beam and generating a signal indicative thereof. When utilized in an information recording system, the detector is positioned adjacent the start position of the scan path so that the generated indicator signal provides a reference for system timing and synchronization. In such a recording environment, synchronization of the system relative to the center position of power distribution within the beam compensates for variations in beam power level and focus, assuring proper alignment of information recorded on consecutive scan lines. In a preferred form, a diode detector, partially masked in a cross-scan direction, is employed to provide an output signal when irradiated by the scanning beam. The detector output signal is amplified and filtered to provide a reference signal which represents the average total power of the beam. The reference signal is divided in half and supplied to a comparator for comparison with the detector output signal. As the beam crosses the edge of the mask, the detector output decreases rapidly towards zero. When this output signal reaches 50% of the average total power level, the comparator switches, creating the indicator signal.
Abstract:
A timing pulse generator for producing timing pulses the period of which is variable. In the timing pulse generator, a plurality of reference pulse trains are produced which have the same frequency as each other, but different phases from each other. Then, each of the pulses comprising the final timing pulses to be produced is created by suitably selecting one of the pulses from among the reference pulse trains, sequentially.