Abstract: Provided is an objective optical system including: a first spherical lens and a second spherical lens that are arrayed in this order from an object; and at least one of a first optical medium and a second optical medium, wherein the first optical medium is a solid or liquid disposed at an object side of the first spherical lens and is in close contact with a surface on the object side of the first spherical lens, over an entire optical path; and the second optical medium is a solid or liquid disposed at an opposite side of the second spherical lens from the object and is in close contact with a surface on the opposite side of the second spherical lens from the object, over the entire optical path.

Abstract: An image forming apparatus includes: a scanner to read each of a first output product serving as a model and a second output product output from the image forming apparatus; a memory that stores a color conversion lookup table to be used when color conversion is performed from a RGB color system into a CMYK color system; and circuitry to correct the color conversion lookup table based on a number of pixels and an amount of change per hue, using read information on the first output product, and re-correct the corrected color conversion lookup table, using read information on the second output product.

Abstract: An image forming apparatus includes: a scanner to read each of a first output product serving as a model and a second output product output from the image forming apparatus; a memory that stores a color conversion lookup table to be used when color conversion is performed from a RGB color system into a CMYK color system; and circuitry to correct the color conversion lookup table based on a number of pixels and an amount of change per hue, using read information on the first output product, and re-correct the corrected color conversion lookup table, using read information on the second output product.

Abstract: An image recording device includes a pressing force adjusting mechanism that adjusts a pressing force of a developing roller that is provided by an elastic member, against a photoconductive drum. This provides for modification and adjustment of the pressing force of the developing roller that is pressed against the photoconductive drum by the biasing force from the elastic member. Consequently, even where the developing rollers have various radius dimensions or where elastic force of the elastic member changes, adequate pressing force depending on each case can be applied to the developing roller, thereby improving the recorded quality of the image recording device.

Abstract: A cleaning unit includes a cleaning member, a storage case, and a transport member. The cleaning member collects waste toner on a surface of the photoconductive drum. The storage case successively stores the waste toner collected by the cleaning member through an inlet. The transport member is provided in the storage case, and rotates to transport the waste toner in the storage case in a rotary axis direction. The transport member rotates with a central portion in the rotary axis direction protruding toward the inlet further than both side portions.

Abstract: An image forming device includes a density correction unit that corrects density based on a density detection value of the density correction pattern; a first density correction pattern generating unit that generates a first density correction pattern having low resolution; and a second density correction pattern generating unit that generates a second density correction pattern having high resolution. When a first density detection value of the first density correction pattern is greater than a predetermined threshold value, the density correction unit corrects the density by determining a density correction reflection rate, based on the first density detection value. When the first density detection value is less than or equal to the predetermined threshold value, the density correction unit corrects the density by determining the density correction reflection rate, based on a second density detection value of the second density correction pattern.

Abstract: An image forming apparatus having density correction characteristic data and a section to execute density conversion on input image data includes a section to generate detecting patterns with multiple area ratios, a section to create images of the patterns on an image bearing member, a section to detect the images of the patterns created on the image bearing member, a section to hold detected values corresponding to the images of the patterns detected from the image bearing member, a section to obtain fixed values or previously detected values as target values for correction, and correction coefficients, a section to calculate a correction characteristic corresponding to the detecting patterns from the obtained target values, the detected values, and correction coefficients, and a section to synthesize new density correction characteristic data from the density correction characteristic data and the correction characteristic corresponding to the patterns.

Abstract: An image forming device includes a density correction unit that corrects density based on a density detection value of the density correction pattern; a first density correction pattern generating unit that generates a first density correction pattern having low resolution; and a second density correction pattern generating unit that generates a second density correction pattern having high resolution. When a first density detection value of the first density correction pattern is greater than a predetermined threshold value, the density correction unit corrects the density by determining a density correction reflection rate, based on the first density detection value. When the first density detection value is less than or equal to the predetermined threshold value, the density correction unit corrects the density by determining the density correction reflection rate, based on a second density detection value of the second density correction pattern.

Abstract: An object of the present invention is to provide an electrophotographic photosensitive body having improved electrophotographic characteristics such as sensitivity and residual potential and also having excellent durability. The present invention provides an electrophotographic photosensitive body having a layer containing at least one specific p-terphenyl compound and at least one polycarbonate resin represented by the general formula (I): in a mass ratio of the p-terphenyl compound to the polycarbonate resin within the range of 2:8 to 7:3.

Abstract: An image forming apparatus including an attribute-value-information holding unit that holds an attribute-value table showing correspondence between a type of gradation processing and a fixing-temperature control attribute value; an image-formation-attribute processing unit that determines a type of gradation processing and a corresponding fixing-temperature control attribute value on the basis of contents of a print instruction and the attribute-value table; a gradation processing unit that performs gradation processing in accordance with the type of gradation processing determined by the image-formation-attribute processing unit; and a fixing-temperature control unit that controls fixing temperature in formation of a print image according to the fixing-temperature control attribute value determined by the image-formation-attribute processing unit.

Abstract: An image recording device includes a pressing force adjusting mechanism that adjusts a pressing force of a developing roller that is provided by an elastic member, against a photoconductive drum. This provides for modification and adjustment of the pressing force of the developing roller that is pressed against the photoconductive drum by the biasing force from the elastic member. Consequently, even where the developing rollers have various radius dimensions or where elastic force of the elastic member changes, adequate pressing force depending on each case can be applied to the developing roller, thereby improving the recorded quality of the image recording device.

Abstract: A cleaning unit includes a cleaning member, a storage case, and a transport member. The cleaning member collects waste toner on a surface of the photoconductive drum. The storage case successively stores the waste toner collected by the cleaning member through an inlet. The transport member is provided in the storage case, and rotates to transport the waste toner in the storage case in a rotary axis direction. The transport member rotates with a central portion in the rotary axis direction protruding toward the inlet further than both side portions.

Abstract: An object of the invention is to provide a method of making a p-terphenyl compound mixture which includes two symmetric p-terphenyl compounds respectively represented by formula (1) and formula (2) and an asymmetric p-terphenyl compound represented by formula (3)

Abstract: An image processing apparatus includes a plurality of color conversion tables for color-separation-limited printing. Using a color conversion table for color-separation-limited printing, a piece of input color information corresponding to chromatic color within a specified applying hue range for a specified specific color is converted into a piece of output color information corresponding to color having hue of the specific color, and a piece of the input color information corresponding to color outside of the applying hue range is converted into a piece of the output color information corresponding to gray color. Each of the color conversion tables for color-separation-limited printing is configured such that color values corresponding to saturation and lightness of the output color information are reduced at least in gradation from a maximum saturation part to a low-lightness part.

Abstract: An object of the invention is to provide a method of making a p-terphenyl compound mixture which includes two symmetric p-terphenyl compounds respectively represented by formula (1) and formula (2) and an asymmetric p-terphenyl compound represented by formula (3)

Abstract: An object of the present invention is to provide an electrophotographic photosensitive body having improved electrophotographic characteristics such as sensitivity and residual potential and also having excellent durability. The present invention provides an electrophotographic photosensitive body having a layer containing at least one specific p-terphenyl compound and at least one polycarbonate resin represented by the general formula (I): in a mass ratio of the p-terphenyl compound to the polycarbonate resin within the range of 2:8 to 7:3.

Abstract: An image forming apparatus having density correction characteristic data and a section to execute density conversion on input image data includes a section to generate detecting patterns with multiple area ratios, a section to create images of the patterns on an image bearing member, a section to detect the images of the patterns created on the image bearing member, a section to hold detected values corresponding to the images of the patterns detected from the image bearing member, a section to obtain fixed values or previously detected values as target values for correction, and correction coefficients, a section to calculate a correction characteristic corresponding to the detecting patterns from the obtained target values, the detected values, and correction coefficients, and a section to synthesize new density correction characteristic data from the density correction characteristic data and the correction characteristic corresponding to the patterns.

Abstract: An object of the invention is to provide: a p-terphenyl compound mixture useful as a charge-transporting agent which has improved solubility in organic solvents to thereby diminish a cracking phenomenon, which poses problems concerning photoreceptor characteristics, and can realize an electrophotographic photoreceptor having high sensitivity and high durability; and an electrophotographic photoreceptor employing the compound mixture. The invention relates to: a p-terphenyl compound mixture which includes two symmetric p-terphenyl compounds respectively represented by the following general formula (1) and general formula (2) and an asymmetric p-terphenyl compound represented by the following general formula (3) which has both a group of substituents of the compound represented by general formula (1) and a group of substituents of the compound represented by general formula (2); and an electrophotographic photoreceptor containing the compound mixture.

Abstract: [Problems] To provide a novel compound useful as an electric charge transporting agent having a high carrier mobility, and making it possible not only to stably form a photosensitive layer without precipitating crystals or developing pinholes when the photosensitive layer is being formed but also to prepare an organic photosensitive material for electrophotography featuring a high sensitivity and a low residual potential. [Means for Solution] The compound is represented by the following general formula (1); In the general formula (1), R1 to R7 are, for example, alkyl groups, X1 is, for example, —CH?CH—CH?CH2, X2 is, for example, —CH?CH2, and k and l are integers of 0 to 4.

Abstract: An image processing apparatus includes a plurality of color conversion tables for color-separation-limited printing. Using a color conversion table for color-separation-limited printing, a piece of input color information corresponding to chromatic color within a specified applying hue range for a specified specific color is converted into a piece of output color information corresponding to color having hue of the specific color, and a piece of the input color information corresponding to color outside of the applying hue range is converted into a piece of the output color information corresponding to gray color. Each of the color conversion tables for color-separation-limited printing is configured such that color values corresponding to saturation and lightness of the output color information are reduced at least in gradation from a maximum saturation part to a low-lightness part.