Abstract:
A picture information input apparatus has a leading and trailing end detecting circuit (42) for detecting the leading and trailing ends of a document to produce read out signals of "1" and "0". The leading and trailing end detecting circuit (42) starts a first count by a document presence detecting signal of "0" from a detecting unit (54) which detects the transfer of the document. When a hole of the document is smaller than an allowable hole diameter, it clears the counting. Only when the hole is larger than the allowable hole diameter, it starts a second count. After the second count ends, it produces a read out signal of "0" indicating that the trailing edge of the document is detected. A picture bus control circuit (44) receives the read out signal of "1" to transmit a picture data signal to a picture transceiver (48), and receives the read out signal of "0" to stop the transmission of the picture data signal.
Abstract in simplified Chinese:本发明系提供一种可依据一步进制置控制表来扫瞄文档影像之影像扫瞄仪,以及产生步进制置控制表的方法。该扫瞄仪包含有一扫瞄模块,用来扫瞄一文档并产生一相对应之影像信号,一驱动设备,用来驱动该扫瞄模块或该文档以进行扫瞄,以及一控制设备,用来控制该扫瞄模块及该驱动设备之操作。该控制设备包含有一步进制置控制表,其内存有驱动设备驱动扫瞄模块或文档移动之步进数。在扫瞄文档时,该控制设备会依据该步进制置控制表内之各扫瞄线位置相对应的步进数来精确控制该驱动设备,进而移动扫描模块或文档至预定扫描线位置进行扫描,以减少因机械公差造成之扫描模块移动偏差的问题。
Abstract:
An optical scanning unit used in an image forming apparatus having a latent image carrier includes a light emitter, a rotary deflector, an inclination adjustment unit, and a controller. The light emitter emits a light beam. The rotary deflector deflects and scans the light beam onto a surface of the latent image carrier. The inclination adjustment unit adjusts an inclination of a scan line corresponding to the light beam relative to a reference scan line on the latent image carrier. The controller changes at least one of a linear velocity of the latent image carrier and a rotation speed of the rotary deflector so as to change a ratio between the linear velocity of the latent image carrier and a scan speed of the light beam, and controls the inclination adjustment unit based on the ratio to keep the scan line from inclining relative to the reference scan line.
Abstract:
PROBLEM TO BE SOLVED: To suppress deterioration in image quality of read image data due to interruption of a process even without making a line start signal synchronous with an encoder signal.SOLUTION: An image reading apparatus makes a line sensor execute a periodical reading operation by inputting a periodical line start signal, while conveys the line sensor at constant speed by feedback control which is based on a target position trajectory. Then, when constant speed conveyance of the line sensor is interrupted to invalidate the reading operation by shortage of spare of a buffer which temporarily stores the read image data, a line sensor position where the reading operation is invalidated based on the target position trajectory is specified as an interrupted position. In addition, conveyance control of the line sensor is started according to input of a line start signal, and prior to start of the conveyance control, a target position trajectory to be used is set as a target position trajectory where the line start signal is inputted when the line sensor arrives at an interrupted position.
Abstract:
An image reading apparatus for reading out images on an image carrying paper sheet is provided. The apparatus includes a motor for feeding the image carrying paper sheet. The motor is driven by a motor driving unit on the basis of motor controlling data. The image reading apparatus further includes a generator for generating the motor controlling data, a photoelectric converter for generating image signals corresponding to the images. The apparatus also includes a register for holding the motor controlling data from the motor controlling data generator. The motor controlling data held by the register are advantageously supplied to the motor driving unit after a predetermined delay time by way of a delay unit which includes a latch circuit for holding the motor controlling data from the register, and a counter associated with the latch circuit.
Abstract:
There is disclosed a method for providing precise color-to-color registration of color dots in a multicolor proof with a thermal printer comprising a CPU and Printer Controller, a Motion Controller, a writing drum, and a writing head coupled to a translation means. Using the disclosed method, a proof and a dye donor member with a predetermined dye color thereon are mounted on the writing drum. The writing head is then moved to a predetermined start position defined by a sensor at a predetermined position along the translation means which has its optical path blocked by the writing head. The writing head is then moved forward to a predetermined home position which is defined by a next subsequent pulse from a multi-pulse radial position-indicating encoder coupled to the translation means occurring after the writing head leaves the start position. In sequence, the writing drum and then the translation means are accelerated with a separate predetermined substantially constant acceleration until a separate predetermined velocity is obtained. After the predetermined velocity of the translation means is obtained, the printing of color dots on the proof is started upon the receipt of a next subsequent pulse from a multi-pulse radial position-indicating encoder coupled to the writing drum. 1. A method of printing color dots on a multicolor proof with a thermal printer comprising a rotatable writing drum and a writing head which is coupled to a translation means comprising the steps of: (a) activating the translation means for moving the writing head to a predetermined fixed start position; (b) moving the writing head in a forward direction to a home position defined by the detection of a next subsequent pulse from a first radial position encoder coupled to the translation means after the writing head has reached the predetermined fixed start position in step (a), and simultaneously therewith stopping the movement of the translation means and the writing head, where the first radial positional encoder produces a predetermined plurality of pulses per revolution of the translation means; (c) accelerating the writing drum with a substantially constant acceleration to a predetermined velocity in response to the receipt of the next subsequent pulse from the first radial position encoder in step (b); (d) accelerating the translation means with a predetermined substantially constant acceleration to a predetermined velocity in response to the writing drum reaching the predetermined velocity in step (c); (e) selectively energizing a predetermined number of thermal elements in the writing head for starting the printing of color dots of a dye color onto a receiver member mounted on the writing drum in response to the writing drum reaching a predetermined radial position after the translation means has reached the predetermined velocity; and (f) repeating steps (a) through (e) for each other dye color needed to print the multicolor proof.
Abstract:
1,214,373. Character recognition. COGNITRONICS CORP. 6 March, 1968 [20 March, 1967], No. 10951/68. Heading G4R. In a character reading system comprising a central station having means for character analysis, which is coupled to a remote station having means for generating signals corresponding to data scanned from a document, means at the remote station produce clock pulses at scan positions uniformly spaced along the scanning path and means controlled by the clock pulses develop binary pulses in accordance with the amount of radiation reflected from the document to direct to the central station data signals corresponding to the binary pulses. The document 26, Fig. 4, is inserted into a guide channel and carried by a drum 20 which is rotated in discrete steps by a stepping motor 22, Fig. 5. A pressure pad 32 is provided with an aperture exposing a transverse portion of the document to scanning by a beam 42 reflected by a mirror 44 from a light source 46, e.g. an electric arc or a laser. The mirrors 44 are arranged around the circumference of a rotating disc 50 driven by a synchronous motor and are disposed at equal angles with respect to their neighbours.. Each time the beam is swept across the document 26 the drum 20 is stationary and between sweeps the drum is rotated a small angular increment by the motor 22. The light reflected from the document is detected by a photo-cell 94 and the resulting signal is supplied to an amplifier 102, Fig. 5, producing a binary output depending upon whether the signal is above or below a predetermined threshold value which is fed to a control circuit 104. A half-silvered mirror 114 reflects the main beam 42 so that a beam 42a scans a strip 110 carrying uniformly spaced vertical markings 112 and the light reflected by the strip is detected by a photo-cell 108. The resulting clock pulses are supplied via an amplifier 106 to the control circuit 104 to gate the signal input, the gated binary pulses then being fed into a shift register in the circuit 104 where the transitions between "black" and "white" are detected and used to control a counter 120 operated by the clock pulses. The counter 20 produces permutation code signals indicating the number of consecutive scan samples of the same character (white or black) which are transferred to a buffer store 122 supplying via transmission line 124 the central station 126. As described, 384 clock pulses are produced during each scan and at the end of a scan the circuit 104 produces a pulse to step the motor 22. The last sample may be arranged by circuit 104 to be a "black" bit to indicate to the central station that the scan is complete. Should the buffer 122 become filled a signal is sent via line 130 to the control circuit 104 which stops the counter and holds the count already developed by the counter, interrupts the stepping signal so that the drum 20 remains in position for a rescan of the same path, and counts 384 clock pulses subsequent to the signal on line 130. When the count reaches 384 the counter 12 is activated, the motor 22 stepped and the coding and transmission is resumed.
Abstract:
PURPOSE:To read video information without error and to file video information, by detecting the size of object to be read, and informing the result of detection, if it is in dissidence with the size designation from an input section. CONSTITUTION:When an original is inputted to a video information file device, the original registration titled information and the designated size information are inputted from a keyboard 3c by the operator according to the operating procedure displayed on a video display device 5a. The original is set to the original reference end of the original carrying section, and the presence of original and the size of original are detected at the original presence detecting section and the orignal size detecting section, and the detected information is inputted to a CPU 3a of an operation controller 3. One page's share of the video information read at the read-in section of a video input device 1 is stored in a page buffer 2a of a video processor 2, and the size designating information from the keyboard 3c and the detected size from the original size detecting section are compared at the CPU 3a, and if they are in dissidence, the result is displayed on a device 5a and the result is informed to the operator.
Abstract:
The relationship between first and second side images is evaluated to determine how the position of the paper and/or the size and arrangement of an image can be manipulated to compensate for paper shrinkage caused by fusing. Show through is reduced by performing setup (S2000) to adjust a pixel clock frequency and/or a photoreceptor speed, determining a residual magnification error (S3000), determining margin shifts (S4000) to compensate for the residual magnification error, and applying the margin shifts (S5000). Paper shrink effects on registration can be compensated for using determinations made during a typical printer setup. Show through errors can be reduced without using a paper conditioner to pre-shrink or re-wet the paper. In simplex and duplex printing, the show through errors worsen as the image moves away from the registration edge. Using information obtained during setup, a margin shift is determined that results in a significant reduction in the maximum show through for each image.
Abstract:
An image recording apparatus records an image on a printing plate wound around a rotating drum with a light beam emitted from an exposure head. In the image recording apparatus, an actual drum rotational speed Nx is recognized, and the image is recorded on the printing plate in an accelerating period (AS) in which the actual drum rotational speed Nx is equal to or higher than a predetermined rotational speed (N2), a constant-rotational-speed period (CS), and a decelerating period (SS). An exposure beam position, an exposure beam output, and an auxiliary scanning speed of the exposure head are corrected dependent on the peripheral speed of the drum in the accelerating period (AS) and the decelerating period (SS).