Abstract: According to one embodiment, an image scanning apparatus includes a document glass, a substrate, a first semiconductor light emitting element, a second semiconductor light emitting element, a light guiding section, and a light receiving section. The substrate is provided below and obliquely opposed to the document glass. The first semiconductor light emitting element is mounted on a first surface of the substrate opposed to the document glass and emits light to an original document via the document glass. The second semiconductor light emitting element is mounted on a second surface on the opposite side of the first surface and emits light. The light guiding section receives incidence of the light emitted from the second semiconductor light emitting element and emits the light to the original document from a position where a normal of the document glass is present between the light guide section and the first semiconductor light emitting element.

Abstract: An image forming apparatus is provided which can form an image of excellent picture quality in which a streak does not appear at a specified position in a main scanning direction.

Abstract: According to one embodiment, a difference in output at connecting positions among line sensors of a CCD sensor is removed by adjusting the gains of gain amplifiers.

Abstract: 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.

Abstract: 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.

Abstract: A contact image sensor comprises a housing, a light source provided on the upper part of the housing to irradiate light to a document, lenses arranged in the housing and provided at least on an entering side and an outgoing side to focus reflected light from a reading position of the document, an aperture angle regulation member having an inclined surface to reflect a part of light irradiated from the light source at the reading position of the document and an aperture portion into which the reflected light enters directly to regulate an aperture angle to permit the reflected light passing through the aperture portion to be irradiated to the lens on the entering side, and a light receiving element array to receive and photoelectrically convert the reflected light focused after passing through the lenses.

Abstract: 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.

Abstract: When an adjustment mode is set, a designation screen A is displayed on a liquid crystal display part 12. A part as an object of adjustment is designated by a touch operation to the designation screen A. Subsequently to this designation, an input screen B for inputting data for adjustment is displayed.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: When an adjustment mode is set, a designation screen A is displayed on a liquid crystal display part 12. A part as an object of adjustment is designated by a touch operation to the designation screen A. Subsequently to this designation, an input screen B for inputting data for adjustment is displayed.

Abstract: 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.

Abstract: 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.

Abstract: Periodically, the dark attenuation characteristic of the electric potential on the surface of the photo conductor drum 20 is detected. Then, the target value ?Vgt of the grid bias voltage ?Vg of the charging unit 24 necessary for maintaining the charged electric potential ?Vod of the developing position of the surface of the photo conductor drum 20 at the set value ?Vods is detected from the above detected dark attenuation characteristic. At image formation where the developing unit 24 works, the value of the grid bias voltage ?Vg of the charging unit 24 is set at the above detected target value ?Vgt.

Abstract: 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.

Abstract: An image forming apparatus of the present invention includes an exposure portion to form an electrostatic latent image by exposing the surface of an image carrier, a developing device to form a developer image by developing the electrostatic latent image formed on the image carrier with a developer and a detecting device that has a specified detecting area on the image carrier and detects the quality change of an image formed on the detecting area. The image forming apparatus of the present invention further includes a means to decide a minimum examination image forming area that is nearly in accord with the detecting area of the detecting device by forming an examination image for the image change detection on the image carrier by the exposure portion and the developing device, detecting the formed examination image by the detecting means and changing the examination image forming area according to the detection result of the detecting device.

Abstract: 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.

Abstract: A toner depositing amount measuring apparatus for measuring the amount of toner deposited on a photosensitive drum includes a light source for irradiating the surface of the photosensitive drum with light and a photoelectric converting section for receiving the reflected light and converting the received reflected light into an electric signal. A logarithmic calculation is applied to the output signal of the photoelectric converting section in a logarithm-compressing section. The temperature characteristics of the logarithm-compressing section are compensated for in a temperature compensating section. The amount of the toner deposition is calculated in a toner depositing amount calculating section based on a difference between the data during non-deposition of the toner and the data during deposition of the toner, the data being obtained from the logarithm-compressing section.

Abstract: 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.