摘要:
According to one embodiment, an image forming apparatus includes: a light source unit including light emitting elements for red, green, and blue; an image pickup section configured to receive, from a reference board on which light from the light source unit is irradiated, reflected light to pick up an image of the reference board; and a control section configured to control the light emitting elements of the light source unit to separately emit light, acquire separate data picked up by the image pickup section, select data having a smallest luminance value among the separate data, and control light amounts of all the light emitting elements of the light source unit with the selected data set as a reference.
摘要:
A technique is provided that can realize highly accurate shading correction with a simple configuration. A light amount of illumination light on a predetermined illumination target by a light source is controlled such that reflected light having a first luminance value as predetermined black reference data, reflected light having a second luminance value as predetermined white reference data, and reflected light having another luminance value as at least one value between the first luminance value and the second luminance value can be obtained. Information concerning the luminance of reflected light obtained by illuminating the predetermined illumination target with the light source, the light amount of which is controlled, is acquired. Shading correction is performed on the basis of the acquired information.
摘要:
When an adjustment mode is set, a designation screen is displayed on a liquid crystal display screen. A part as an object of adjustment is designated by a touch operation to the designation screen. Subsequently to this designation, an input screen for inputting data for adjustment is displayed.
摘要:
The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the photosensitive drum 20 is judged in accordance with the difference between the detected charging potential and residual potential, or the difference between the detected charging potential and exposure potential.
摘要:
The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the photosensitive drum 20 is judged in accordance with the difference between the detected charging potential and residual potential, or the difference between the detected charging potential and exposure potential.
摘要:
The residual potential and charging potential of the surface of a photosensitive drum 20, or the charging potential and exposure potential of the surface of the photosensitive drum 20 are detected by an exposure sensor 28. The lifetime of the photosensitive drum 20 is judged in accordance with the difference between the detected charging potential and residual potential, or the difference between the detected charging potential and exposure potential.
摘要:
An image forming apparatus includes a conductive transparent member arranged between a photoconductive drum and a laser optical system for exposing the drum. The transparent member is electrically connected to a bias voltage power supply. In reversal development, the bias voltage power supply supplies the transparent member with a voltage ranging from a charging voltage to a developing voltage so as to generate an electric field between the transparent member and the drum. In normal development, the power supply supplies the transparent member with a voltage ranging from the developing voltage to ground so as also to generate an electric field between the transparent member and the drum.
摘要:
An image-reading device, in which the 1-bit signals a CCD line sensor has generated from the light applied from an illumination lamp and reflected from an original are shading-corrected, thereby forming image data. Before scanning the original, a black reference signal, a white reference signal at a level higher than that of the black reference level, and three intermediate reference signals are generated and stored into memories. During the scanning of the original, a selector selects two of the reference signals in accordance with the level of each signal output by the CCD line sensor, and the difference between the signal output by the sensor and the black reference signal is shading-corrected, by using the two reference signals selected by the selector. The signal output by the CCD line sensor can therefore made linearly proportional to the intensity of the input light, even if the CCD line sensor has no linear input-output characteristic or even if the photoelectric elements of the sensor have different input-output characteristics.
摘要:
An image scanning apparatus includes an image pickup device, a substrate connected to a terminal of the image pickup device, a heat radiation plate which is disposed between the image pickup device and the substrate and one surface of which contacts the image pickup device, and an insulating sheet which is sandwiched between the heat radiation plate and the substrate, respective surfaces of which contact the heat radiation plate and the substrate, and which electrically insulates the heat radiation plate from an electronic component on the substrate.
摘要:
An apparatus includes a white reference member, an exposure lamp, a CCD sensor including a plurality of linear sensors connected in series, and a plurality of gain amplifiers which amplifies the outputs of the linear sensors, respectively. The apparatus selects one linear sensor, adjusts the gain of the gain amplifier corresponding to the selected linear sensor, adjusts the gain of the gain amplifier corresponding to the linear sensor existing to the left side of the selected linear sensor, and adjusts the gain of the gain amplifier corresponding to the linear sensor existing to the right side of the selected linear sensor. A difference in output at connecting positions among the line sensors is removed by adjusting the gains of gain amplifiers.