Abstract: An image forming apparatus that displays an image, includes: a scanning section that scans light from a light source in a main scanning direction and a sub-scanning direction orthogonal to the main scanning direction, as drawing sine waves; a detecting part that detects a change in a position of the scanning part in the main scanning direction and a change in a position of the scanning part in the sub-scanning direction; a phase difference comparator that detects a phase difference and a frequency ratio between the main scanning direction and the sub-scanning direction, based on the change in the position of the main scanning direction and the change in the position of the sub-scanning direction; and an image data generation part that estimates a scanning trajectory of the scanning part based on the phase difference and the frequency ratio, and generates pixel data corresponding to the scanning trajectory.

Abstract: A light amount detecting apparatus includes: a photoelectric converting element converting quantity of light inputted to current; a current/voltage converting device having a positive input terminal connected to a first terminal of the photoelectric converting element, a negative input terminal connected to a second terminal of the photoelectric converting element, a negative output terminal for reversing polarity of a current inputted to the positive input terminal and outputting it as a voltage, a positive output terminal for reversing polarity of a current inputted to the negative input terminal and outputting it as a voltage, a first negative feedback resistor connecting the positive and negative output terminals, and a second negative feedback resistor connected between the negative and positive output terminals, the current/voltage converting device setting the photoelectric converting element in zero bias and converting the converted current to the voltage; and an amplifying device for amplifying the c

Abstract: An image display apparatus is provided to display a smoothly moving image with a high resolution that includes: a light source 60; a light source drive part 20 that drives the light source; a deflector that repeatedly scans light from the light source in predetermined Lissajous patterns; and a drive waveform generation part 40. One of the Lissajous patterns is constituted by a first field and a second field, the first field being formed by first scanning trajectories and the second field being formed by second scanning trajectories. The light source drive part 20 drives the light source 60 based on image data corresponding to a field rate that is a repetition frequency to repeat the first field and the second field; and the drive waveform generation part 40 controls the deflector such that main scanning position X and sub-scanning position Y hold relationships represented by following equations.

Abstract: An image forming apparatus that displays an image, includes: a scanning section that scans light from a light source in a main scanning direction and a sub-scanning direction orthogonal to the main scanning direction, as drawing sine waves; a detecting part that detects a change in a position of the scanning part in the main scanning direction and a change in a position of the scanning part in the sub-scanning direction; a phase difference comparator that detects a phase difference and a frequency ratio between the main scanning direction and the sub-scanning direction, based on the change in the position of the main scanning direction and the change in the position of the sub-scanning direction; and an image data generation part that estimates a scanning trajectory of the scanning part based on the phase difference and the frequency ratio, and generates pixel data corresponding to the scanning trajectory.

Abstract: A two-dimensional light scanning apparatus includes: a deflector to drive at a resonance frequency in a main scanning direction and a sub-scanning direction different from the main scanning direction; a position sensor to detect a scanning position of the deflector; a resonance frequency predicting part to predict the resonance frequency of the deflector; and a deflector drive control part to: for drawing a Lissajous figure in which scanning trajectories of the deflector do not overlap with each other for one frame, store a plurality of pairs of respective frequency ratios of driving signals in the sub-scanning direction to driving signals in the main scanning direction, and respective phases of the driving signals in the sub-scanning direction with respect to the driving signals in the main scanning direction; select one pair of a frequency ratio and a phase; and control the deflector with a driving signal.

Abstract: A two-dimensional light scanning apparatus includes: a deflector to drive at a resonance frequency in a main scanning direction and a sub-scanning direction different from the main scanning direction; a position sensor to detect a scanning position of the deflector; a resonance frequency predicting part to predict the resonance frequency of the deflector; and a deflector drive control part to: for drawing a Lissajous figure in which scanning trajectories of the deflector do not overlap with each other for one frame, store a plurality of pairs of respective frequency ratios of driving signals in the sub-scanning direction to driving signals in the main scanning direction, and respective phases of the driving signals in the sub-scanning direction with respect to the driving signals in the main scanning direction; select one pair of a frequency ratio and a phase; and control the deflector with a driving signal.

Abstract: A light amount detecting apparatus includes: a photoelectric converting element converting quantity of light inputted to current; a current/voltage converting device having a positive input terminal connected to a first terminal of the photoelectric converting element, a negative input terminal connected to a second terminal of the photoelectric converting element, a negative output terminal for reversing polarity of a current inputted to the positive input terminal and outputting it as a voltage, a positive output terminal for reversing polarity of a current inputted to the negative input terminal and outputting it as a voltage, a first negative feedback resistor connecting the positive and negative output terminals, and a second negative feedback resistor connected between the negative and positive output terminals, the current/voltage converting device setting the photoelectric converting element in zero bias and converting the converted current to the voltage; and an amplifying device for amplifying the c

Abstract: The problem of the present invention is, in a plural-number order delta sigma D/A converter, not to cause click noise upon performing mute operation at no-signal input idling and hence to eliminate the necessity of a circuit for removing this. In order to perform sequence operation for rendering zero an output signal by lowering the order of a loop filter in order when stopping the operation of a plural-number order delta sigma D/A converter, 1st-order differentiators corresponding to each order and switch means for rendering inputs to these 1st-order differentiators zero are provided in the loop filter.

Abstract: An improved delta sigma digital-to-analog converter in which the thermometer code, which is output from a thermometer code converter, is divided into P blocks for every Q bits. An arrangement of the blocks is shifted in rotation by a barrel shifter at a frequency fs. Along with this, an arrangement of bits within each block is shifted in rotation by a shift register at a frequency of Q times fs. The bits within the code thus obtained are provided to local DACs, each specified to correspond to each of the given bits. In this manner, it is possible to maintain a lower operating frequency while at the same time to reducing the distortion in the output caused by a change in shifting the data in rotation in the local DACs, which change occurs depending on bit levels of the data in a form of the thermometer code.

Abstract: A delta-sigma D/A converter has a quantizer, a thermometer code converter portion, and an odd/even bit-interchanging portion. The quantizer produces a first digital signal. The thermometer code converter portion and odd/even bit-interchanging portion divide the output level of the first digital signal such that it is represented by the sum of the output levels of second and third digital signals. Each of the second and third digital signals has an output level obtained by dividing the output level of the first digital signal by a factor of 2 or an integer close to it. During the former half of each sampling interval, first and second adders produce, respectively, a level signal corresponding to the second digital signal and an inverted level signal corresponding to an inversion of the third digital signal.

Abstract: When a photoreceptor provided in an image forming apparatus is electrified for image formation, the output of a charger starts with a different value from a predetermined value and it is controlled to gradually match up to the predetermined value. It is also controlled in a way to start with a lower value than a predetermined value corresponding to the time a charger suspended its operation and gradually match up to the predetermined time. Such control is carried out by controlling grid voltage which flows into grid electrode disposed between a photoreceptor and wire electrode provided for discharging.

Abstract: A sheet aligning arrangement adapted to accommodate a plurality of sheets fed into it for aligning, and to feed out the aligned sheets one sheet by one sheet. The arrangement includes a feed roller, a first aligning member movable between a first position defining a sheet aligning reference position and a second position parallel to the first position and defining a sheet transport reference position, a second aligning member located in a position confronting the first aligning member, and pivotable in a direction intersecting at right angles with a sheet transport direction, and a displacing device for displacing the first aligning member to the first position during the alignment to effect aligning together with the second aligning member, and also for displacing the first aligning member to the second position during the re-feeding of the sheets by the feed roller, while pivoting the second aligning member to align the sheets.

Abstract: A copying apparatus capable of effecting duplex copying and composite copying and including an intermediate tray member for storing a plurality of copy paper sheets each having one copied face and refeeding the stored copy paper sheets one sheet by one sheet and a mounting member for detachably mounting the intermediate tray member on an apparatus housing of the copying apparatus in a direction perpendicular to a transport direction of the copy paper sheets. The intermediate tray member includes a storage portion for storing the copy paper sheets, first and second transport portions for transporting the copy paper sheets to the storage portion at the time of duplex copying and composite copying, respectively and a paper feeding device for feeding the copy paper sheets stored in the storage portion.

Abstract: The present invention relates to a copying machine capable of executing a duplex mode copying and composite mode copying. The copying machine has an intermediate tray for receiving and aligning the copied papers and for re-feeding them to an image formation station. The operation of the intermediate tray is controlled in accordance with the copy mode.

Abstract: A scan type anamorphic magnifying apparatus provided with a scanning device for scanning an original document in form of a slit, an image forming device for projecting and forming an image of the scanned document on a photosensitive member, and a device for substantially continuously varying a moving speed of the scanning device relative to a moving speed of the photosensitive member to permit the image of the document to be formed on the photosensitive member in varied magnifications. The apparatus further comprises an anamorphic optical unit movable into and out of a projection optical path leading to the photosensitive member. This optical unit is moved out of the optical path when anamorphic magnification is in a range close to "1" and into the optical path when the magnification is in a range far from "1".

Abstract: A toner dispensing device has a toner storage chamber provided in its lower portion with an opening for passing toner therethrough, a roller disposed within the storage chamber close to the opening and rotatable to deliver the toner from the storage chamber outward through the opening, an intermediate toner supply chamber in communication with the storage chamber through the opening and for receiving toner to keep it substantially full, and a feeder provided within the intermediate supply chamber for feeding the toner out of the intermediate supply chamber at a constant rate.

Abstract: Steady flow of dry toner from the discharge outlet of a toner tank is produced by inducing vortex-like motion of toner within the tank to inhibit toner bridging. A rotating brush associated with the discharge outlet has a rim in grazing contact with an edge of a fixed, inclined plate to establish the toner motion. In a preferred form of toner-supplying device, two discharge outlets are used, each associated with a brush/plate set.