Abstract: A process for producing a pyridine derivative, which comprises reacting an azametallacyclopentadiene represented by formula (1) with an alkyne in an organic solvent containing a complex of a transition metal such as Ni(II). (In formula (1), M represents an early transition metal, e.g., Zr, Ti or Hf; L represents cyclopentadienyl, indenyl, fluorenyl, hydrocarbon-oxy, amide, acetylacetonato, or carboxy group, a phosphine ligand, an amine ligand, an ether ligand, or a ligand comprising two or more these bonded to each other through appropriate crosslinking group; n is an integer of 1 to 4; and R1, R2, R3, R4 and R5 each represents C1-20 (substituted) alkyl, alkenyl, an aromatic group, silyl, alkoxy, or an ester group.

Abstract: A repairing method using a lance for repairing an oven wall surface of a coke oven comprises the steps of arranging a distance sensor at a top end of the lance, quantitatively measuring a depth of a worn or a damaged area by the distance sensor, and blowing a repairing material from a repairing nozzle to the worn area in accordance with a measurement result to thereby repair the worn area. The lance used in this repairing method has a multistage structure having a polygonal cross section and is extendable. With this structure, the oven wall surface can be scanned in a linear fashion or along a plane. If the top end of the lance is movable in accordance with a basic motion pattern and/or a travelling pattern, it is possible to readily repair a repair range having a complicated shape.

Abstract: An optical scanner includes a light source including a laser diode for emitting a laser beam, and an optical deflector such as a rotary polygonal mirror for deflecting the laser beam to thereby produce a scanning laser beam. The laser diode is protected from being overheated by arranging the light source in a heat insulating chamber or by cooling the light source with the air flow circulated by the rotation of the rotary polygonal mirror in cooperation with a curved guide plate.

Abstract: A compact type bar code reader for detecting a bar code symbol provided on a surface of an article. The bar code reader includes a laser beam generation unit for generating the laser beam to be irradiated onto a bar code symbol, and a focus unit for determining a focus of the laser beam, and a scanning pattern forming unit for forming various scanning patterns of the laser beam. The bar code reader also includes a light reflection unit for reflecting the laser beam to and from the bar code symbol, a light collection unit for collecting the laser beam reflected from the bar code symbol, and a light reception unit for receiving the laser beam collected by the light collection unit, and converting it to an electrical signal.

Abstract: A semiconductor laser driving circuit has a semiconductor laser for emitting a laser beam according to a drive power. A photodetector is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit is connected for monitoring the electric signal to output a monitor signal indicative of variation in intensity of the laser beam. A controlling circuit is connected for comparing the monitor signal with a given reference signal to output a control signal according to difference therebetween. A powering circuit is operative according to the control signal to apply to the semiconductor laser a drive power effective to eliminate the difference. An abnormality detecting circuit is provided for comparing the monitor signal with a given limit signal which is set different from the reference signal to detect abnormality to output an abnormality signal.

Abstract: An article detection device includes: a light emission unit for emitting a detection light for irradiation onto an article, and a light reception unit for receiving a light reflected from the article. The article detection device also includes; an analog-to-digital converter for converting the reflected light to a digital signal, a first register for storing the digital signal after being sampled using a first sampling signal having a first period, and a second register for storing the digital signal after being sampled using a second sampling signal having a second period shorter than the first period.

Abstract: A camera equipped with an automatic controlling device for both focusing and the shutter operation comprising a focus detection controlling circuit, an exposure controlling circuit, a single electromagnet controllable by these two circuits and a mechanical or electrical means for operating the two circuits in a predetermined order so as to positively and stably perform a predetermined operation and to make it possible to compactly and cheaply manufacture the camera.

Abstract: A photographic camera of a type using film cartridges, comprising a sensing lever which can cooperate with a film contained in a film cartridge and a control lever engaged with said sensing lever so as to make a release button operatable only when the film has been completely wound up in case the cartridge is mounted on a camera body so that the operating stroke of the release button may be small and the structure may be simplified.

Abstract: Apparatus comprising a moon projector including an element for changing the phase of the moon, a gear system for transmitting a drive force to the moon phase changing element, a drive system for annual motion, a drive system for independently changing the phase of the moon provided independently of the annual motion drive system, differential gear means for selectively transmitting the operation of the annual motion drive system or of the drive system for independently changing the moon phase to the drive force transmitting gear system, and switching means for selectively operating the annual motion drive system or the drive system for independently changing the moon phase, whereby changes in the lunar phase as related to annual motion or changes in the lunar phase independent thereof can be selectively projected without impairing the continuous changing mode of the lunar phase.