Abstract: An optical disc device is provided with an optical head including a light source, a condensing optical system including an objective lens for receiving a light beam emitted from the light source and forming a microspot on a multilayer optical recording medium, a photodetector for receiving the light beam reflected by the multilayer optical recording medium and outputting an electrical signal corresponding to the amount of light and a coma aberration correcting element for correcting a coma aberration of the condensing optical system, and a processing circuit for controlling the condensing optical system and the coma aberration correcting element.

Abstract: In order to prevent the lowering of yield of fibers of stock which is pinched by two wires and being transferred, specific dewatering blades are disposed on each of the wires are used. Blade sets are disposed on two wires 1, 2 forming loops to pinch stock 7 and running therealong. The blades of one blade set are dewatering limiting blades 20, each having a plane portion 20a to support the wires 1, 2 and an inclined face 20b disposed on the wire entering side of said plane portion 20a and forming a space of a wedge shape facing the wire face and enlarging toward the upstream side in the wire running direction. The blades of the other blade set are dewatering blades 21, each having a plane portion 21a to support the wires 1, 2 and an edge 21b to scrape water toward the upstream side of said plane portion 21a. The plane portion 21a having the edge 21b is disposed opposite to the space of a wedge shape.

Abstract: A container coupling device is disclosed for coupling upper and lower containers together in a simple and reliable manner to allow for reliable transport of stacked containers. The container coupling device includes a rotation restriction mechanism provided between a lower insertion shank and a lower engaging body. The lower engaging body is formed on upper and lower sides with tapered surfaces. A rotary shaft has a spring to bias the lower engaging body in a locking direction. The rotation restriction mechanism serves to temporarily prevent the lower engaging body from turning in the locking direction. This rotation restriction action can be released by additional turning torque in the locking direction. Such torque is produced when the upper or lower tapered surfaces engage with an engaging hole in the container. Upon release of the restriction mechanism, the spring will turn the lower engaging body toward the locking position.