Abstract: In the case of being mounted with any cartridge other than a genuine cartridge, which accommodates a toner other than a genuine toner, a user can select as an operation mode other than that corresponding to a genuine toner, through a UI device 18, making a correction to the consumption of a developer by combining conditions to be changed, such as increasing or decreasing the degree of a change (gradient) in a set value of the toner density with respect to the consumption of a developer (m1 or m2); increasing or decreasing a limit value (m1 or m2); varying an initial value (consumption=0) (m3); no making a change in a set value according to the consumption (m4); and no making a change in a set value according to the consumption, for example, by varying an initial value (m5)

Abstract: An image forming apparatus has at least one replaceable unit replaceably mounted to an image forming apparatus main body. The image forming apparatus outputs a message purporting that a reservation of an operation mode can be received, at the timing that a replacement timing of the replaceable unit which is currently mounted is close in time. If so, prior to the replacement of the replaceable unit which is current mounted, a reservation of an operation mode for a replaceable unit which is to be mounted next time may be received. Further, if the replacement of the replaceable unit is detected, the image forming apparatus starts the control according to the reserved operation mode.

Abstract: An image forming apparatus has at least one replaceable unit replaceably mounted to an image forming apparatus main body. The image forming apparatus outputs a message purporting that a reservation of an operation mode can be received, at the timing that a replacement timing of the replaceable unit which is currently mounted is close in time. If so, prior to the replacement of the replaceable unit which is current mounted, a reservation of an operation mode for a replaceable unit which is to be mounted next time may be received. Further, if the replacement of the replaceable unit is detected, the image forming apparatus starts the control according to the reserved operation mode.

Abstract: In the case of being mounted with any cartridge other than a genuine cartridge, which accommodates a toner other than a genuine toner, a user can select as an operation mode other than that corresponding to a genuine toner, through a UI device 18, making a correction to the consumption of a developer by combining conditions to be changed, such as increasing or decreasing the degree of a change (gradient) in a set value of the toner density with respect to the consumption of a developer (m1 or m2); increasing or decreasing a limit value (m1 or m2); varying an initial value (consumption=0) (m3); no making a change in a set value according to the consumption (m4); and no making a change in a set value according to the consumption, for example, by varying an initial value (m5)

Abstract: A sub-scanning position of a laser beam is detected as an analog signal by a sub-scanning position detection sensor, and is then converted into a digital signal by an A/D converter. The signal is converted into a digital value (a detection result) having the same unit system as that of a count value for generating a vertical synchronization signal. This detection result and a set count value which is a count value for generating a vertical synchronization signal are added together by an adder. This added value is input to a vertical synchronization signal generation counter as a count value for generating an actual vertical synchronization signal. The set count value which is an initial set value is set from a control panel. Accordingly, a color-image forming apparatus which is capable of correcting a registration deviation in a sub-scanning direction is easily provided.

Abstract: The formation of a high-quality image at a resolution at which a dot size is smaller than the diameter of a laser beam is attained at a low cost. When an exposure operation is carried out by increasing an optical intensity of a laser beam to a level higher than that of a steady-state optical intensity thereof by utilizing a difference, which is ascribed to an exposure rate of a photosensitive body, in the condition of a latent image formed, the depth and width of a latent image, which were small in all related art cases, can be increased to high levels. Therefore, overshoot is generated at the LD lighting starting time to increase the optical intensity at a rising edge of the laser beam to a level higher than that of a steady-state optical intensity thereof, whereby a height to width ratio and the reproducibility of one dot and a halftone in a case where the resolution is smaller than the diameter of the laser beam can be improved.

Abstract: The present invention improves the grade of an output image formed by composition of plural images in a simple and low-cost constitution. Cylindrical mirrors corresponding to the respective colors (K, Y, M, C) are respectively provided with a scanning line inclination and bend correcting mechanism. Further, the side registration, the lead registration and the scaling factor are corrected by controlling the modulation timing of a laser beam corresponding to each color. The color aberration caused by the change in the ambient environment is corrected by detecting a variation in the positional relationship between the respective beams by a main scanning position detecting sensor and a sub-scanning position detecting sensor provided by each color to be reflected in the control for the modulation timing.

Abstract: A light scanning device deflects a plurality of light beams by a deflecting means performs divided scanning on a single scanning line on a photoconductor with the plurality of deflected light beams. When the scanning line is scanned, a detecting means detects a light beam passing through a predetermined position in front of a position where the light beam first strikes an image forming range on the photoconductor. An oscillating means oscillates a specified number of clocks in a time interval from when the light beam is detected by the detecting means until it is detected thereby again. An adjusting means makes adjustments so as to irradiate a plurality of light beams based on clocks oscillated by the oscillating means. In a time interval after the light beam is detected by the detecting means until it is detected thereby again, a plurality of light beams are irradiated based on the specified number of clocks.

Abstract: Plural linear marks extending along a scanning direction are spaced apart from each other at constant intervals and parallel to each other at a boundary of partial exposure ranges. When the marks are repeatedly formed by two light beams while a position of the mark formed by one of the two light beams is moved in the scanning direction, a density within a predetermined region corresponding to the boundary is changed so as to become lighter as the intervals between the marks are increased. When plural linear marks, which extend along the scanning direction and are spaced apart from each other at constant intervals and parallel to each other at a boundary portion of partial exposure ranges, are formed by two light beams while a position of the mark formed by one of the light beams is moved in a direction perpendicular to the scanning direction, a density within a predetermined region is changed so as to become lighter as an amount of offset is reduced.

Abstract: A light scanning device deflects a plurality of light beams by a deflecting means performs divided scanning on a single scanning line on a photoconductor with the plurality of deflected light beams. When the scanning line is scanned, a detecting means detects a light beam passing through a predetermined position in front of a position where the light beam first strikes an image forming range on the photoconductor. An oscillating means oscillates a specified number of clocks in a time interval from when the light beam is detected by the detecting means until it is detected thereby again. An adjusting means makes adjustments so as to irradiate a plurality of light beams based on clocks oscillated by the oscillating means. In a time interval after the light beam is detected by the detecting means until it is detected thereby again, a plurality of light beams are irradiated based on the specified number of clocks.

Abstract: Light scanning devices forming electrostatic latent images on photosensitive bodies are disposed so as to correspond respectively to the plurality of photosensitive bodies which correspond to a plurality of colors, respectively. Electrooptical elements are disposed on light paths of light beams. The electrostatic latent images formed on the respective photosensitive bodies 1 are respectively developed by developing means. Developed electrostatic latent images are respectively superposed together and transferred onto a sheet, so that a color image is formed. Images-for-detecting-offset-amounts, which are formed on a conveying body by the light scanning devices, are detected, and offset amounts of images of the respective colors are detected. Based on detected offset amounts, voltages are applied to the respective electrooptical elements such that the offset amounts become values of a predetermined range.

Abstract: A light scanning device deflects a plurality of light beams by a deflecting means performs divided scanning on a single scanning line on a photoconductor with the plurality of deflected light beams. When the scanning line is scanned, a detecting means detects a light beam passing through a predetermined position in front of a position where the light beam first strikes an image forming range on the photoconductor. An oscillating means oscillates a specified number of clocks in a time interval from when the light beam is detected by the detecting means until it is detected thereby again. An adjusting means makes adjustments so as to irradiate a plurality of light beams based on clocks oscillated by the oscillating means. In a time interval after the light beam is detected by the detecting means until it is detected thereby again, a plurality of light beams are irradiated based on the specified number of clocks.

Abstract: A sorting device for use with the document reproduction machine according to the present invention is constructed so that each of the sorting bins for stacking sorted copies is successively moved upward or downward with respect to the discharge port of the machine to directly receive each copy when several copies made from the same original are discharged successively from the discharge port. In a nonsort-mode, only a specified sorting bin is positioned facing the discharge port of the machine. In the sort-mode, if the document reproduction machine is not operated for a predetermined time after copying has been completed, the machine is returned to the nonsort-mode.