Abstract: This invention relates to an optical fiber for long period grating (LPG), LPG components, and manufacturing method of LPG used as a mode coupler, an optical filter, etc. The optical fiber for LPG comprises a core layer, a first cladding layer that surrounds said core layer and transmits the cladding modes, and a second cladding layer that surrounds said first cladding layer and confines the optical signal of the cladding mode within said first cladding layer. The LPG component comprises an optical fiber for LPG, a coating reinforcement to cover and reinforce said optical fiber for LPG. The manufacturing method of LPG comprises a step of preparation of an optical fiber, a step of constructing the LPG on a predetermined region in said core of said optical fiber by irradiating laser light on said region over a predetermined period corresponding to the LPG, on the predetermined part of said optical fiber, and a step which covers and reinforces said grating region.

Abstract: This invention relates to an optical fiber for long period grating (LPG), LPG components, and manufacturing method of LPG used as a mode coupler, an optical filter, etc. The optical fiber for LPG comprises a core layer, a first cladding layer that surrounds said core layer and transmits the cladding modes, and a second cladding layer that surrounds said first cladding layer and confines the optical signal of the cladding mode within said first cladding layer. The LPG component comprises an optical fiber for LPG, a coating reinforcement to cover and reinforce said optical fiber for LPG. The manufacturing method of LPG comprises a step of preparation of an optical fiber, a step of constructing the LPG on a predetermined region in said core of said optical fiber by irradiating laser light on said region over a predetermined period corresponding to the LPG, on the predetermined part of said optical fiber, and a step which covers and reinforces said grating region.

Abstract: A drug solution delivery device comprises barrel (1) provided with a port at a distal end thereof and opened at a proximal end thereof, gasket (2) fluid-tightly and slidably arranged in the barrel, cylindrical connecting member (3) having proximal end (32) and distal end (31) to which gasket (2) is releasably connected, plunger (4) removably connected to proximal end (32) of connecting member (3), and pressed helical spring (5) arranged between gasket (2) and connecting member (3).

Abstract: A document processing printing apparatus such as a word processor has a main body constituted by a box-like frame. The frame includes a top surface serving as a flat paper supply guide surface. A print output unit included in the frame has at least one pair of rollers for transferring a recording paper along and on the paper supply guide surface and includes a flat platen, and a printing head.