A motor control apparatus is arranged to drive and control a motor for transmitting the rotating force of the motor through a gear train. In reversing the rotation of the motor, the motor is caused to rotate at a speed higher than a normal rotation speed for a period of time which is about the same as a period of time required for absorbing a clearance or play existing between the gears. In this instance, since the motor is under no load, the motor is rotated at the higher speed with a small cur...

The present invention provides crystals of the compound represented by formula (I): ##STR1## crystals of a vitamin D derivative which are obtained by purifying a crude or preliminarily purified product of the vitamin D derivative through a reverse phase chromatography and then crystallizing the purified derivative from an organic solvent; novel compounds which are formed during the synthesis of a vitamin D derivative as by-product; and a method for purifying a vitamin D derivative or the precurs...

The present invention provides crystals of the compound represented by formula (I): ##STR00001## crystals of a vitamin D derivative which are obtained by purifying a crude or preliminarily purified product of the vitamin D derivative through a reverse phase chromatography and then crystallizing the purified derivative from an organic solvent; novel compounds which are formed during the synthesis of a vitamin D derivative as by-product; and a method for purifying a vitamin D derivative or the pre...

This invention has as its object to prevent a flexible flat cable which connects a control board and an image reading unit from contacting a document table glass. An image reading apparatus has an image reading unit for reading a document placed on a document table glass, a drive unit for scanning the image reading unit relative to the document, and a flexible flat cable for electrically connecting an electric circuit fixed in the main body of the image reading apparatus, and the image reading u...

A compound represented by formula (III): ##STR00001##

The present invention provides crystals of the compound represented by formula (I): ##STR1## ;crystals of a vitamin D derivative which are obtained by purifying a crude or preliminarily purified product of the vitamin D derivative through a reverse phase chromatography and then crystallizing the purified derivative from an organic solvent; novel compounds which are formed during the synthesis of a vitamin D derivative as by-product; and a method for purifying a vitamin D derivative or the precur...

A sheet feeding apparatus for separating stacked sheets one by one and feeding the sheets which includes a feed roller for feeding sheets, a retard roller for separating the sheets one by one between the retard roller and the feed roller, and a torque limiter for transmitting a predetermined torque to the retard roller. The sheet feeding apparatus also includes a roller shaft for movably supporting the retard roller, a gear for transmitting a drive force to the roller shaft of the retard roller,...

A sheet feeding apparatus for separating stacked sheets one by one and feeding the sheets includes a rotative feeder rotating in a feeding direction for feeding the sheets; a retard roller disposed so as to be capable of contacting the rotative feeder rotating in reverse direction for separating the sheets one by one; a driver for driving the rotative feeder and the retard roller; a clutch for transmitting drive power from the driver to the rotative feeder when in a powered-on state, and for ren...

The invention relates to a holographic viewing device that enables a given pattern to be properly viewed in place of light sources in a scene and is easy to fabricate and assemble with consistent characteristics, and a computer-generated hologram for the same. The invention provides a holographic viewing device in which computer-generated holograms 2 and 3 each constructed as a transmission Fourier transform hologram is fitted in a frame member 1. At least one of phase information and amplitude ...

An original pressing apparatus applicable to, e.g., an original reading apparatus having: an original pressing plate; a hinge unit having a first end supported rotatably with respect to the original pressing plate and a second end rotatably supported by an external device; and a press-fixing unit adapted to prevent rotation between said hinge unit and said original pressing plate by pressing the original pressing plate and the hinge unit into contact in a rotation axial direction, wherein the pr...