摘要:
A sampling clock generator circuit includes a reference clock generator, a sampling hold circuit, a sampling clock generator to delay an output clock signal from the reference clock generator by a predetermined delay amount to generate and supply a sampling clock signal to the sampling hold circuit, a phase determining element to compare phases of a drive clock signal for an image reading unit and the sampling clock signal to output a result of the phase comparison, the drive clock signal generated according to the output clock signal of the reference clock generator, and a controller to adjust the delay amount of the sampling clock generator on the basis of the result of the phase comparison so that a phase difference between the drive clock signal and the sampling clock signal becomes zero.
摘要:
An image forming apparatus for forming an image on a recording material comprises a first spreading clock generator for spreading a band of a reference clock that is synchronized with a predetermined frequency, and generating first spreading clock signals; a first control circuit for controlling the image forming apparatus or each section of the image forming apparatus, and which is driven by the first spreading clocks; a second control circuit for controlling the image forming apparatus or each section of the image forming apparatus; a communication line through which a data communication is conduced between the first control circuit and the second control circuit; and a temporary memory section provided in the communication line for temporarily storing communicated data.
摘要:
A disclosed optical scanning device includes a light beam generating unit configured to generate a light beam; a light beam deflecting unit configured to receive the light beam and deflect/emit the light beam with a deflecting mirror; a light beam ON/OFF control unit configured to control the light beam generating unit so that the light beam deflected by the light beam deflecting unit is turned ON/OFF in a particular light beam scanning region while the light beam is being reciprocally scanned; and a light beam scanning time measuring unit configured to obtain a measurement value by measuring a time at which the light beam passes a reference point provided on an edge part of the entire light beam scanning region that is away from a center part of the entire light beam scanning region. Timings at which the light beam is turned ON/OFF are controlled in accordance with the measurement value.
摘要:
An image forming apparatus includes: a plurality of optical scanning parts (20a,b,c,d) that scan a photoconductor (10) with light of plural colors to form an electrostatic latent image on the photoconductor (10) based on print data; and a controller (60) that, based on a first optical scanning part (20a) to which a horizontal synchronization signal is applied of the optical scanning parts (20a,b,c,d), calculates an offset value for light-scan of a second optical scanning part (20b) of the optical scanning parts (20a,b,c,d), and controls the optical scanning parts (20a,b,c,d) to scan the photoconductor (10) with the light according to the calculated offset value.
摘要:
In the scanning optical apparatus, a light source including one or more of the plurality of light emitting points of the light source device, and a synchronism detecting device constituting the synchronism detecting device are provided on the same substrate, an optical element constituting the synchronism detecting device is provided on a light incidence side of the synchronism detecting device, and the scanning optical apparatus has a constitution in which the optical element is rotated in synchronism with the substrate when the substrate is rotated.
摘要:
There is provided beam diameter control method and device for changing a focused beam diameter of a laser beam, which can increase light utilization without incorporating a complicated and expensive optical or zoom system. In the beam diameter control method and device, an optical path difference equal to or more than a coherence length of the laser beam is applied to a portion of light flux of the laser beam before the laser beam is focused. A transparent plate is provided to apply such an optical path difference. The laser beam is preferably emitted from a longitudinal multimode semiconductor laser the coherence length of which is short. The transparent plate may be a parallel flat plate or ring-like plate placed near the center of the light flux. The transparent plate is preferably placed within the parallel beam portion of the laser beam. The transparent plate may be placed in a divergent beam portion or a convergent beam portion instead. In this case, the quantity of light flux divided by the transparent plate can be easily changed by moving the position of the transparent plate in a direction parallel to the optical axis.
摘要:
Four beams are caused to scan a scanning surface in the main scanning direction in parallel. The beams expose the target area between two optical sensors, not the surface of a photosensitive drum, to produce correction data to correct shifts in the exposure positions of the four beams in the main scanning direction with an accuracy of less than a small fraction of one pixel. On the basis of the correction data, an actual image formation area is set on the photosensitive drum. This makes it possible to always control the relative exposure scanning position accurately even when the relationship between the main scanning positions of the light beams is unknown.
摘要:
A printing device reads an image on a printing paper with an image pickup part. It image-processes obtained image data in a control part, and operates the positions of respective register marks (R1 to R4). It operates the quantity of displacement necessary for positioning an image. It obtains an offset count number Co for deciding an image recording starting position from the obtained quantity of displacement. It stores the obtained offset count number Co while obtaining starting position data. Then, dimensional correction data for the image is calculated. The image on the printing paper is first picked up, and the necessary quantity of displacement is calculated. A speed coefficient k is calculated for changing the rotational speed of a plate cylinder. Following this, a correction quantity by a Cd default count number previously set for deciding the image recording starting position is changed. Accordingly, the offset count number Co is calculated again on the basis of the obtained speed variable k. The obtained speed coefficient k and the offset count number Co are stored, and starting position data is obtained from both data.
摘要:
Es wird eine Bebilderungseinrichtung zur Erzeugung von Bildpunkten (210) durch n einzeln ansteuerbare Lichtquellen (12), welche jeweils einen Abstand s i , wobei der i = 1...n, zu einer Gegenstandslinie (14) aufweisen, in einer Projektionslinie (16) der Gegenstandslinie (14) auf einer Druckform (28) vorgeschlagen, welche sich mit einer Geschwindigkeitskomponente v senkrecht zu der durch die Projektionslinie (16) und tangential zur Druckformoberfläche bewegt. Die Bebilderungseinrichtung zeichnet sich dadurch aus, dass der Ansteuerungseinrichtung (216) eine zeitliche Verzögerungseinrichtung (222) zugeordnet ist, welche den Auslösezeitpunkt der Ansteuerungseinrichtung für jede Lichtquelle (12) in Abhängigkeit vom jeweiligen Abstand s i verschiebt. Die Bebilderungseinrichtung kann vorteilhaft in Direct Imaging Druckwerken oder Druckformbelichtern zum Einsatz kommen.
摘要翻译:这是至n独立可控光源生成图像点(210)(12)每个都具有间隔SI,其中,所述1 I = A主题行(14),... N,其具有在投影线(16)的成像装置 提出了一种印版(28)v,并用速度分量垂直于通过所述突出部(16)中的线移动的对象线(14)切向于印版表面。 的摄像装置的特征在于,所述驱动装置(216)的时间延迟装置(222)相关联,该转移驱动的触发的时间装置,用于根据相应的距离SI每个光源(12)。 所述成像装置可以有利地直接成像印刷单元一起使用或Druckformbelichtern使用。