Abstract: An image recording apparatus has a stand-by mode in which a recording operation is interrupted during recording for stand-by. The apparatus includes a recording head for recording on a recording medium, a head temperature detecting device for detecting the temperature of the recording head, a memory device for storing temperature information detected by the head temperature detecting device when recording in the stand-by mode is interrupted, a stand-by time counting device for counting an interruption time for recording operation in the stand-by mode, and a head driving controlling device for transmitting a driving signal to the recording head. The controlling device is responsive to a temperature stored in the temperature memory device and an interruption time calculated by the stand-by time counting device on resumption of a recording operation after it is interrupted and the apparatus is placed in the stand-by mode.

Abstract: A correction data production apparatus includes a detecting unit for reading a test pattern formed by a recording head having a plurality of recording elements constituting an array, and for detecting a density distribution of a range of the array of the plurality of recording elements, a corresponding unit for causing the density distribution detected by the detecting unit to correspond to the plurality of recording elements on the basis of a reference position where a density of an end portion of the density distribution reaches a predetermined threshold value, a production unit for producing correction data for an image formation density uniforming drive conditions in correspondence with the plurality of recording elements on the basis of the density distribution corresponded by the corresponding unit, and a changing unit for changing the threshold value in accordance with characteristics of the test pattern.

Abstract: The present invention aims to improve the image forming efficiency by selecting positions where image adjusting toner images are formed to non-image areas of convey means by changing the supply timing of a transfer sheet onto the convey means, in an image forming apparatus wherein a plurality of electrophotographic photosensitive members are arranged side by side and color toner images formed on the photosensitive members are successively transferred onto a transfer sheet supplied at transfer positions for the photosensitive members thereby to form a color image on the transfer sheet.

Abstract: An image forming apparatus includes an image forming means, for forming an image on an image receiver member, which in turn includes an image bearing member on which a toner image can be born, a latent image forming means for forming a latent image modulated by an electric signal on the image bearing member, and transfer means for transferring the toner image onto the image receiver sheet. Also included in the image forming apparatus are first detection means for detecting the density of the toner image on the image bearing member before an image transferring operation, second detection means for detecting the density of the toner image on the image receiver member after the image transferring operation, and control means for controlling a transferring condition of the transfer means and an image forming condition of the latent image forming means on the basis of detection results from the first and second detection means.

Abstract: The present invention relates to image recording apparatus for performing image recording on a recording medium by using plural types of recording heads, each having a plurality of recording elements comprising an array. A test pattern forming unit for forming test patterns on the recording medium by using the plural types of recording heads, a reading unit for reading the test patterns recorded by the test pattern recording unit, and a correction unit for correcting image signals for driving the recording elements in accordance with the recording elements and types of recording heads on the basis of data read by the reading unit are included whereby image density is made uniform.

Abstract: An ink jet recording apparatus for effecting recording with ink that adheres to a recording medium has an ink jet recording head unit having a recording head in which a plurality of electrothermal conversion elements available to discharge the ink are arranged, a heat exchange device having a first heat exchange portion contacting with the whole area of one side of the recording head in the lengthwise direction thereof and effecting heat exchange and a second heat exchange portion provided in continuation to the first heat exchange portion and extending on the outside far from the recording head, a heater provided near the second heat exchange portion for heating the heat exchange device, and a temperature detector provided on a portion of the first heat exchange portion; the second heat exchange portion being inclined upwardly relative to the recording head; a cooling device for acting on the second heat exchange portion of the heat exchange device and assisting the heat radiation of the second heat exchange

Abstract: An image recording apparatus and method performs recording by making an ink adhere to a recording medium according to the blot ratio of a recording medium, when using an ink droplet or heat sensitive ink. Input recording data is discriminated based on a predetermined reference value based on the blot ratio and when the image data is larger than the reference value, the image data is reduced in order to reduce the ink dot size. Reducing the ink dot size at a recording boundary improves the quality of the image recorded at the recording boundary.

Abstract: In a multi-image forming apparatus having a plurality of electrophotographic photosensitive members and adapted to form a multi-image by sequentially transferring image formed on the photosensitive drums onto a transfer sheet, it is possible to the service life of the photosensitive member having the higher frequency in use. To this end, the photosensitive member having the higher frequency in use has a different construction which differs from those of the other photosensitive members. Further, if necessary, an image forming method by the photosensitive member having such different construction is differentiated from those by the other photosensitive members.

Abstract: According to a method and apparatus for processing a color image, three primary color signals are input, and the input three primary color signals are processed to obtain three color reproduction signals and a black reproduction signal. In order to obtain the black reproduction signal, a value corresponding to a minimum value of the three primary color signals is obtained, and the value is transformed by a continuous function having a downwardly convex shape, thereby defining a transformed value as the black reproduction signal.

Abstract: An image recording apparatus includes an input circuit for inputting an image signal; a correction circuit for correcting the inputted image signal; an image forming circuit for forming an image in accordance with the image signal corrected by the correction circuit; a switch for generating a signal indicating a method of observing the image formed by the image forming circuit; and a control circuit for controlling the correction circuit in accordance with the signal generated by the signal generating switch.

Abstract: According to a method and apparatus for detecting a kind of a recording sheet, a light source for emitting a beam on the recording sheet and a photosensitive element for detecting an amount of beam are used. The photosensitive elements located at predetermined positions are caused to detect amounts of beams reflected by upper and lower surfaces of the recording sheet. The kind of upper or lower surface of the recording sheet is discriminated on the basis of a difference between the amounts of beams reflected by the upper and lower surfaces or one of the amounts of beams.