Abstract: When a predetermined pattern (e.g. a pattern indicating the serial number of a copying machine) is added on an image formed on a recording paper, the image formation apparatus suppresses the appearance of fog by the addition of a predetermined pattern in the vicinity of the image. More particularly, a control circuit, which inputs and processes an image signal, estimates the leading and ending edge positions of the recording paper with respect to the transferring direction. The edge which is perpendicular to the transferring direction of the recording paper is determined based on a signal obtained from an ITOP generation circuit and a BD detector. Accordingly, an effective area for image formation on the recording paper is obtained and a modulation amount for adding the predetermined pattern is controlled in accordance with the position on the recording paper at which the predetermined pattern is added.

Abstract: Computer controlled numbering of consecutive business forms is provided for both computer controlled presses and in the form of a retrofit unit for conventional rotary presses. The retrofit unit includes a disk provided with radially oriented metallic strips of predetermined locations on the disk, and mounted on a suitable shaft of the press. The disk cooperates with a stationary transducer mounted, for example, on a stationary press wall to send signals to the control unit to fire the printer.

Abstract: An image forming apparatus which forms on a recording paper a visible image in accordance with image data, the forming being performed by using an electrophotographic method, and the apparatus being able to reduce a total recording time spent for recording one page as compared to the present technology. The image forming apparatus comprises a processing unit, comprising a photosensitive drum on which a latent image is formed while the drum is being rotated at a predetermined rotational speed, for processing the image data so as to form the visible image, a conveying unit for conveying the recording paper to/from the processing unit, a driving unit for driving the photosensitive drum and the conveying unit, and a controlling unit for controlling the driving unit so that the rotational speed of the photosensitive drum is changed based on a length of the visible image being formed on said recording paper.

Abstract: In a field emission microcathode array, a plurality of cones are arranged in a plurality of blocks, each of plural cones, on the main surface of a substrate, each cone having a sharp tip. A plurality of gate electrode portions respectively correspond to the blocks, each portion having a plurality of openings therein corresponding to the plurality of cones of the respective block, each opening being aligned with and disposed in surrounding relationship relative to the corresponding tip of the respectively associated cone. A plurality of lead electrodes, each configured as a fuse, are respectively connected to the plurality of gate electrode portions and each lead electrode provides an independent connection of the respective gate electrode portion to the common power source. In another embodiment, each gate electrode portion and wiring films connected thereto have respectively high and low resistances.

Abstract: An image forming apparatus is disclosed, in which a photo-sensitive member is exposed by exposure means accommodated therein, and development is done substantially simultaneously with the exposure.Three time elements, that is, charging time constant C, i.e., time until reaching of a predetermined charging potential on of the photo-sensitive member in a brushing contact region between the photo-sensitive member and a toner holder after the start of charging, exposure time constant R, i.e., time until the charging potential is attenuated by the exposure to a latent image potential, and development time or time T, during which the photo-sensitive member passes by the brushing contact region, are appropriately determined.

Abstract: The light-transmitting electrode is arranged in correspondence with a pixel, and the photoconductive element and the capacitor element which are arranged on one surface of the light-transmitting electrode and connected in series with each other through the light-transmitting electrode are arranged on a substrate. The plurality of photoelectric converters each of which can apply a voltage across the corresponding photoconductive and capacitor elements are two-dimentionally arranged, and the photoconductive elements and the capacitor elements are commonly connected to each other. A voltage is applied across the photoconductive elements and the capacitor elements.

Abstract: A dry-type toner is temporarily put on a printing paper with electrification by an electrifying unit and a toner supplying unit. A laser diode is driven on the basis of a video signal to emit a laser beam by which the dry-type toner put on the printing paper is melted and fixed thereon. A remaining toner that was not melted on the printing paper is eliminated by a cleaning unit. A printing by the laser beam can be realized most easily without using expensive parts such as a photosensitive material or the like and without increasing its mechanism and circuit scale.

Abstract: An image forming apparatus comprises image information which outputs a sync signal and generated image information synchronously with the sync signal; an image forming apparatus forms an image on the basis of the image information at either one of a plurality of resolutions and which generates a sync request signal to request a transmission of the sync signal; and a resolution changeover means.When the image forming unit received the resolution change over request signal before the sync request signal is generated, the image forming unit executes the switching operation of the resolution, and if the image forming unit received the resolution changeover request signal after the sync request signal had been generated, the image forming unit does not execute the switching operation of the resolution.

Abstract: An apparatus for forming an electrostatic latent image for each pixel on a photoreceptor, wherein each pixel has an imaging unit area and the dot is formed in the imaging unit area. There are provided types of reference wave signals to provide plural different modulating image signals for each pixel so that the dot can be exposed at different positions in the imaging unit area in accordance with position information obtained by processing image signals of pixels neighboring a target pixel.

Abstract: Print data constructed of character data and so forth is developed into image data made of a dot matrix by a developing portion. Each band of the image data is stored in a raster buffer RAM. Each band of the image data is output and thereby an electrostatic latent image is formed on the printing drum. The developing portion provides data equivalent to a developing time for each band in advance. The developing time of each band is stored in a band management memory. A maximum developing time is obtained in accordance with the data stored in the band management memory. A rotating speed of the printing drum is obtained in accordance with the maximum time. The rotating time of the printing drum is optimized. Thus, the laser printer can prevent print data from being lost on a paper.

Abstract: In an electrophotographic image forming apparatus including a charger for electrically charging the photoconductor to a predetermined initial electric potential, a laser projects a light onto the photoconductor so as to form an electrostatic latent image thereon, and a developing device develops the latent image with toner so as to form a toner image thereon. Further, a charger controller controls the charger based on a detection result of a detector for detecting a state of the photoconductor so that the initial electric potential of the photoconductor changes in a predetermined range, and a selection controller selects one of the plurality of gradation correction data stored in a storage unit based on the detection result of the detector when the initial electric potential of the photoconductor is an upper or lower limit value of the predetermined range.

Abstract: A multifunctional printer includes a printing portion for printing data on a print medium, a read head for reading data on a read medium, and an enclosed medium carrying passage. The printing portion comprises an electrophotographic record portion. The enclosed medium carrying passage is disposed so as to surround the printing portion and is capable of transferring both the print medium and the read medium. A reversing portion is disposed on the enclosed medium carrying passage to turn the medium upside down. With the arrangement of this multifunctional printer, it is possible to perform double-sided printing on the printed medium and to perform double-sided reading on the read medium. It is also possible to make a multifunctional small-sized printer.

Abstract: In a method and apparatus for testing subsystem and/or system performance of an electronic printer, a controller uses an electronic scanning system bitmap representing an image to be printed to determine locations to be sensed by a plurality of sensors. The sensors are strategically located throughout the printing apparatus and are adapted to sense particular attributes in the designated image areas during the imaging process. The sensed image characteristics are compared with predetermined model characteristics, and the outputs are adjusted in accordance with the comparison to the model characteristics. In addition to the control function just described, the controller uses the information about the image contained in the image bitmap to determine the location and timing for the sensors, thereby enabling pre- and post-transfer testing without the printing of test pages or test patches.

Abstract: Endless web or drum type laser printers have enhanced copy registration. Image frame length control has particular utility in a printing or reproduction apparatus that writes one or more images on a photosensitive media that is driven by a low cost synchronous hysteresis A.C. motor. The power line frequency is monitored and compared to a precision crystal clock. When the frequency is lower than specification and the motor slows down the number of scan lines are increased by repeating them to lengthen the image frame. When the power line frequency is higher than specification, the number of scan lines per image frame are decreased by deleting scan lines to shorten the image frame.

Abstract: This invention modifies printing information from a laser scanner to improve the appearance of printed matter. This improvement takes into account the image data of a target pixel to be printed and the image data of adjacent pixels located before and after the target pixel, the pulse position of the target pixel. An operator can select whether to shift the radiation timing of a laser beam to the left or the right within one pixel, and whether to squeeze the laser beam to reduce its beam size or broaden it to increase its beam size.

Abstract: A full-color image printing method and apparatus operate to form mono-color toned images of individual color components using multiple, e.g., four, mono-color imaging units provided in correspondence to the color components and single-lined screen processors provided in correspondence to the imaging units, and overlap the mono-color toned images sequentially to produce a full-color image on a sheet of print paper. The screen angle is made different among the mono-color toned images and the line pitch of the screen is made virtually equal for all mono-color toned images with the intention of retaining a high-grade color quality and preventing the degradation of picture quality such as a degraded tone quality.

Abstract: An image recording apparatus for recording an image by application of light beam to a photosensitive member includes a photosensitive member; a light source for emitting first and second beams, one of the first and second beams bearing image information; and a scanner for scanning the photosensitive member with the first and second beams with a time interval so that they are overlapped on the photosensitive material.