Abstract: The present invention provides a clock supply device and a clock supply method by which the holdover characteristics that maintains with high precision the same frequency as the frequency observed immediately before an error can be achieved simply with the addition of a high stability oscillator. An output clock signal that is output from a conventional PLL circuit is monitored with a clock signal of a high-stability fixed oscillator, and the monitor result is written in a memory. A holdover reference generating circuit averages the result written over a certain period of time. When a frequency error monitoring circuit detects a frequency error in an input reference signal, a selector selects a holdover reference, instead of the input reference signal, and inputs the holdover reference to the PLL circuit. Alternatively, the holdover reference generating circuit may select the input of the PLL circuit at the time of an error, and then perform holdover.

Abstract: The present invention provides a clock supply device and a clock supply method by which the holdover characteristics that maintains with high precision the same frequency as the frequency observed immediately before an error can be achieved simply with the addition of a high stability oscillator. An output clock signal that is output from a conventional PLL circuit is monitored with a clock signal of a high-stability fixed oscillator, and the monitor result is written in a memory. A holdover reference generating circuit averages the result written over a certain period of time. When a frequency error monitoring circuit detects a frequency error in an input reference signal, a selector selects a holdover reference, instead of the input reference signal, and inputs the holdover reference to the PLL circuit. Alternatively, the holdover reference generating circuit may select the input of the PLL circuit at the time of an error, and then perform holdover.

Abstract: In a method of manufacturing a photoreceptor drum which has been coated and then quick dried, the drum having a plurality of vertically-stacked base drums that are coated and dried from the uppermost base drum toward a lowermost base drum. The uppermost base drum is held by a second holding member, and a next lower base drum is held by a first holding member respectively. Thereafter the uppermost base drum is separated from the next lower base drum.

Abstract: An image reading device for reading an image by a solid-state image reading elements (CCDs) being disposed at the image forming point of an optical unit which is integrated with at least an image forming lens, dichroic mirror for separating the color image into plural color components and unit construction parts such as a base, fixing plates, and lens barrel. The image reading elements are fixed to a lens holding member with an attaching plate by using adhesive. The attaching plate has a position adjusting mechanism.

Abstract: An object of the invention is to provide a color image reading device having a lens unit for introducing an color image, an optical prism for separating the color image into a plurality of optical image components, and a plurality of CCDs for converting the optical image components into image signals in which the CCDs are attached to projection surfaces of the optical prism by using adhesive materials.