An image forming apparatus includes a first light source, a second light source, an optical sensor, a storage, and a hardware processor that controls operation of the image forming apparatus, wherein the first wavelength and the second wavelength have a wavelength having a high correlation between the transmittance and the basis weight, compared with those at other wavelengths, and the hardware processor calculates a first transmittance from the amount of the first emission light and the amount of the first transmission light, calculates a second transmittance from the amount of the second emission light and the amount of the second transmission light, derives a first basis weight corresponding to the first transmittance, derives a second basis weight corresponding to the second transmittance, and derives a first average basis weight obtained by averaging the first basis weight and the second basis weight.

An image forming apparatus includes a first light source, a second light source, an optical sensor, a storage, and a hardware processor that controls operation of the image forming apparatus, wherein the first wavelength and the second wavelength have a wavelength having a high correlation between the transmittance and the basis weight, compared with those at other wavelengths, and the hardware processor calculates a first transmittance from the amount of the first emission light and the amount of the first transmission light, calculates a second transmittance from the amount of the second emission light and the amount of the second transmission light, derives a first basis weight corresponding to the first transmittance, derives a second basis weight corresponding to the second transmittance, and derives a first average basis weight obtained by averaging the first basis weight and the second basis weight.

An image forming apparatus includes a first light source, a second light source, an optical sensor, a storage, and a hardware processor, wherein the storage stores a first threshold for determining a type of the recording material based on the basis weight, and the hardware processor calculates a first transmittance from the mount of the first emission light and the amount of the first transmission light, calculates a second transmittance from the amount of the second emission light and the amount of the second transmission light, derives a first basis weight corresponding to the first transmittance and a second basis weight corresponding to the second transmittance, by using predetermined determination criteria, determines the type of the recording material based on the first basis weight and the second basis weight, and derives the basis weight according to the determination criteria based on the determined type of the recording material.

An image forming apparatus includes a first light source, a second light source, an optical sensor, a storage, and a hardware processor, wherein the storage stores a first threshold for determining a type of the recording material based on the basis weight, and the hardware processor calculates a first transmittance from the mount of the first emission light and the amount of the first transmission light, calculates a second transmittance from the amount of the second emission light and the amount of the second transmission light, derives a first basis weight corresponding to the first transmittance and a second basis weight corresponding to the second transmittance, by using predetermined determination criteria, determines the type of the recording material based on the first basis weight and the second basis weight, and derives the basis weight according to the determination criteria based on the determined type of the recording material.

In an image forming apparatus, a cover 558 rotates from an open position to a closed position, so that an urging portion 561 urges a first portion-to-be-urged 566, and a slidable portion 525 moves from a rear side toward a front side. By this, an optical print head 105 moves from a retracted position toward an exposure position. Thereafter, when the cover 558 further rotates, the urging portion 561 moves from the first portion-to-be-urged 566 onto a second portion-to-be-urged 567 and moves on the second portion-to-be-urged 567. By this, the slidable portion 525 and link portions 651-654 are kept in a rest state without being moved with rotation of the cover 558.

There is disclosed a layered article that can be used in indirect printing, in analog or digital processes. The layered article, when configured as a transfer member, may serve to receive an ink in any form, allow the ink to be treated so as to form an ink image, and permit the application of the ink image on a substrate. The transfer member comprises a support layer and an imaging layer, which may be formed of a silicon matrix including dispersed carbon black particles. Methods for preparing the same are also disclosed.

An image recording apparatus includes a plurality of laser emission parts disposed side by side in a predetermined direction for emitting laser light; an optical system configured to collect a plurality of beams of laser light emitted by the laser emission parts onto the recording target moving relative to the laser emission parts in a direction crossing the predetermined direction; and an output control unit configured to perform control such that energy of laser light emitted from an outermost end laser emission part of the laser emission parts is greater than energy of laser light emitted from a center laser emission part, the outermost end laser emission part emitting laser light to be transmitted through vicinity of an end portion of the optical system, the center laser emission part emitting laser light to be transmitted through a portion other than vicinity of the end portion of the optical system.

An image recording apparatus includes a plurality of laser emission parts disposed side by side in a predetermined direction for emitting laser light; an optical system configured to collect a plurality of beams of laser light emitted by the laser emission parts onto the recording target moving relative to the laser emission parts in a direction crossing the predetermined direction; and an output control unit configured to perform control such that energy of laser light emitted from an outermost end laser emission part of the laser emission parts is greater than energy of laser light emitted from a center laser emission part, the outermost end laser emission part emitting laser light to be transmitted through vicinity of an end portion of the optical system, the center laser emission part emitting laser light to be transmitted through a portion other than vicinity of the end portion of the optical system.

An imaging device for projecting individually controllable laser beams onto an imaging surface movable in an X-direction. The device includes a plurality of semiconductor chips each comprising a plurality of laser beam emitting elements arranged in a main array of M.Math.N. The chips are mounted such that each pair of adjacent chips in the Y-direction are offset from one another in the X-direction and, if activated continuously, the emitted laser beams of the two chips of said pair trace on the imaging surface a set of parallel lines that are substantially uniformly spaced in the Y-direction. In addition to the M.Math.N elements of the main array, each chip comprises at least one additional column on one or each side, each additional column containing at least one selectively operable element capable of compensating for any misalignment in the Y-direction in the relative positioning of the adjacent chips on the support.

An imaging device for projecting individually controllable laser beams onto an imaging surface movable in an X-direction. The device includes a plurality of semiconductor chips each comprising a plurality of laser beam emitting elements arranged in a main array of M.Math.N. The chips are mounted such that each pair of adjacent chips in the Y-direction are offset from one another in the X-direction and, if activated continuously, the emitted laser beams of the two chips of said pair trace on the imaging surface a set of parallel lines that are substantially uniformly spaced in the Y-direction. In addition to the M.Math.N elements of the main array, each chip comprises at least one additional column on one or each side, each additional column containing at least one selectively operable element capable of compensating for any misalignment in the Y-direction in the relative positioning of the adjacent chips on the support.