Abstract:
Disclosed herein is a device including a timing control circuit that receives a strobe signal supplied from outside to generate an internal strobe signal that is used as a timing signal to latch a data signal. An operation state of the timing control circuit is changed according to temperature change so as to keep an output timing of the internal strobe signal with respect to an input timing of the strobe signal.
Abstract:
A transport path switching unit is provided between transport rollers and pre-registration rollers, and control is performed to switch between a main transport path and an extended transport path of the transport path switching unit such that either the main transport path or the extended transport path is interposed as the part of the paper transport path between the transport rollers and the pre-registration rollers to vary a total length of the paper transport path.
Abstract:
Disclosed is a timing control circuit which receives a first clock having a period T1 and a group of second clocks of L different phases (where L is a positive integer) spaced apart from each other at substantially equal intervals and which generates a fine timing signal delayed from the rising edge of the first clock by a delay td of approximately td=m·T1+n·(T2/L), where m and n are non-negative integers. The timing control circuit has a coarse delay circuit and a fine delay circuit. The coarse delay circuit counts the rising edges of the first clock after an activate signal is activated and generates a coarse timing signal delayed from the first clock by approximately m·T1. The fine delay circuit has a circuit which, after the activate signal is activated, detects a second clock, which has a rising edge that immediately follows the rising edge of the first clock, from among the group of L-phase second clocks. Using the edge-detection information, the fine delay circuit generates a fine timing signal for which the amount of delay from the coarse timing signal is approximately n·(T2/L). The values of m and n can be set by registers.
Abstract:
A feeding device according to the present invention includes a box, paper holders, and a shifting mechanism. The box is open at its top. The paper holders are open at their tops and positioned in the box. Each of the paper holders holds a pile of sheets of paper in it. The shifting mechanism so shifts at least one of the paper holders that the top sheet in one of the paper holders is positioned in a single feed position in the box according to selection data output from the apparatus with which the feeding device is used.
Abstract:
Disclosed is a semiconductor device including a first clock generator that generates a first clock signal having a first period from an input clock signal, a second clock generator that generates a second clock signal having a second period from the input clock signal, and a timing generator that receives the first clock signal, the second clock signal, an activation signal from a command decoder and a selection signal for selecting the delay time from a timing register to produce a timing signal delayed as from activation of the activation signal by a delay equal to a sum of a time equal to a preset number m prescribed by the selection signal times the first period and a time equal to another preset number n prescribed by the selection signal times the second period. The timing register holds the values of m and n. These values are set in the timing register in an initialization sequence at the time of a mode register set command. In the operating states, the timing signals are output from the timing generator at a desired timing based on the information stored in the timing register (FIG. 6).
Abstract:
A duty detection circuit includes discharge transistors, charge transistors, detection lines, and a comparator circuit that detects a potential difference of these detection lines, and also includes a gate circuit that controls the discharge transistors and the charge transistors in response to the internal clock signal of an even cycle. As a result, the detection lines are charged and discharged in response to the internal clock signal of the even cycle. Consequently, the duty detection circuit can be applied to a multi-phase DLL circuit, and a potential difference appearing in the detection line can be sufficiently secured.
Abstract:
In an image forming apparatus of the present invention, a scorotron charging device has a meshed grid electrode which is meshed more coarsely in a high-speed apparatus than a meshed grid electrode in a low-speed apparatus according to a circumferential velocity of a photoreceptor. With this arrangement, it is possible to charge the photoreceptor at a predetermined potential in the high-speed apparatus, without increase of the amount of ozone generation and upsizing of the image forming apparatus.
Abstract:
In one embodiment, a predetermined period different from a fixing process period in which fixing of toner to recording paper is carried out is set as a toner removal period, and during the toner removal period a hot roller and a pressure roller are intermittently rotated, and separation claws in contact with the rollers are caused to vibrate by the intermittent rotation of the rollers such that toner adhered to the separation claws is caused to drop due to this and is removed. Also, faces of the separation claws that oppose the surfaces of the hot roller and the pressure roller are set in a convex shape.
Abstract:
A voltage controlled oscillator that is a differential ring oscillator type voltage controlled oscillator that, by connecting in cascade differential delay elements to which differential clock signals of a mutually reverse phase are input and controlling the current that flows to the differential delay elements by a bias voltage, controls a delay amount of this differential clock signal, having a phase detection portion that outputs a detection signal by comparing an output voltage of the differential output of any differential delay element and a reference voltage that is set to a voltage that detects an abnormal operation, and a cross-coupled circuit that is provided at each of the differential delay elements and, when the detection signal is input, amplifies the potential difference between the pair of differential output terminals.
Abstract:
In one embodiment of the invention, in an image forming apparatus that reverses the front and back of recording paper by performing switchback transport of the recording paper to perform duplex printing of the recording paper, the image forming apparatus is provided with a control means that, when performing duplex printing of the recording paper, forms a void area at a leading end and a trailing end of the recording paper, the void area preventing curling of the recording paper around a roller.