Abstract: The present invention provides an annular exposure device, including: plural light emitting members that are provided two-dimensionally along an outer circumferential surface of the annular exposure device, the annular exposure device rotating when the annular exposure device contacts a surface of an image holding member.

Abstract: A medium detecting apparatus and an image forming apparatus are supplied capable of making medium move without hitting sensor lever while skew adjustment or medium setting operation. In the image forming apparatus, a medium hit surface of the sensor lever to detect skew holds inclinations in plural directions and a guider to limit the medium is furnished on the inclined side; or a medium hit surface of the sensor lever to detect skew holds inclinations in plural directions and position detections in movement direction of carriage and in conveyance direction of medium are performed by one sensor; or a sheet guider is further furnished and the sensor lever whose medium hit surface holds inclinations in plural directions is used as a sensor to detect a paper setting; or a hand-operated adjustment print function is further furnished and the sensor lever whose medium hit surface holds inclinations in plural directions is used as a sensor to detect a paper setting.

Abstract: An ink composition includes a colorant, a reactive polymer latex such as an epoxy copolymer latex, an optional dissipatable polymer, a dispersant such as a sulfonated polyester, and a liquid vehicle such as water. The ink composition is a stable liquid at ambient temperature, but becomes a gel upon heating or removal of part of the liquid vehicle.

Abstract: According to a feature of the present invention, an imaging apparatus has a support with a cylindrical inner surface for receiving a recording media about an axis of the support. A rotor forms a gap with the inner surface such that the gap varies as the rotor rotates and as an inverse function of the concentricity of the support and the rotor. An electrode is carried at the portion of the rotor forming the gap with the inner surface such that a capacitance between the electrode and the inner surface varies as the rotor rotates and as an inverse function of the concentricity of the support and the rotor. A detector, including a power source adapted to produce an electrical charge across the gap and an impedance, measures the change in the dimension of the gap as the rotor rotates so that the concentricity of the support and the rotor can be measured while the rotor is rotating.

Abstract: A printer for forming an image by image-wise exposure of a layer of chromogenic microcapsules. The observable image produced may have a three-dimensional topographical structure, such as to form the bumps of the Braille alphabet, or to replicate the surface variations and texture of brush strokes of a conventional painting. A digitized photographic image can be printed in full color, and the photographic image can be computer enhanced. A locally variable attractive field member having an operable surface receives an image in a layer of chromogenic microcapsules. An optomagnetic and/or optoelectric coating on the attractive field member receives light information and generates an attractive field to selectively apply and vary a respective local attractive field associated with discrete locations of the operable surface.