Abstract:
An apparatus for and a method of controlling a high voltage in an image forming apparatus using the high voltage with a high alternating current voltage superimposed on a high direct current voltage. The apparatus includes: a high alternating current voltage output unit outputting the high alternating current voltage; a high direct current voltage output unit outputting the high direct current voltage; and a controlling unit controlling the high alternating current voltage output unit and the high direct current voltage output unit such that the high alternating current voltage is output before the high direct current voltage when the high voltage is required for printing.
Abstract:
Disclosed is a printed circuit board comprising a contact terminal, which prevents a poor contact and reduces a manufacturing cost, and an image forming apparatus having the same. The printed circuit board comprises a circuit part for controlling and processing an operation of electronic appliance, and a large-area contact terminal formed by a group of small-area terminals for electric connection with external device. The small-area terminals can be formed in various types, respectively having regular size and shape and being distanced a predetermined interval. Accordingly, unevenness of the large-area contact terminal surface caused by soldering is prevented since a plurality of small-area terminals constitute a unit contact terminal of over a predetermined size. Therefore, quality of contact with external terminal improves. Further, manufacturing cost is reduced, and the manufacturing process becomes simple.
Abstract:
A developer concentration measuring apparatus of a liquid printer includes a container installed so that developer supplied to a photoreceptor web enters and is exhausted, a roller rotatably installed in the container for forming a film of the developer contained in the container on a surface thereof being exposed while rotating, a roller driving module for driving the roller to rotate at a predetermined speed, a light emitting module for emitting a predetermined amount of light to the surface of the roller where the film is formed, a light-receiving module, installed to detect light emitted from the light emitting module and passing through the film, for transmitting a signal corresponding to the amount of received light, a temperature detector for detecting the temperature of the developer contained in the container; and a concentration measuring module for measuring the concentration of the developer from information on temperature output from the temperature detector and from the signal output from the light-receiving module. Thus, by obtaining the information on the temperature of developer and measuring the concentration of the developer appropriate to the obtained temperature information, generation of concentration measurement errors is lowered.
Abstract:
A photoreceptor web for an image forming apparatus includes a base layer, a conductive ground layer formed on the base layer, and a photosensitive layer formed on the ground layer, where an electrostatic latent image is formed by scanned light. A first protective layer is formed on the photosensitive layer for protecting the photosensitive layer, and a heating layer is formed on a rear surface of the base layer in a predetermined pattern for receiving electric power and generating resistance heat. The photoreceptor web is maintained at a constant temperature by the resistance heat generated by the heating layer.