Fukakusa

Masaharu Fukakusa, Kumamoto JP

Patent application number	Description	Published
20100080105	Optical Pickup Device and Optical Disk Driver Using the Same - A light source, an objective lens, and an astigmatism generation element producing for light for focus control, and an optical receiver are provided. The astigmatism generation element is interposed between the objective lens and the optical receiver and produces focal points in front of and behind the optical receiver within two mutually orthogonal cross-sectional planes including an optical axis of the reflected light. The astigmatism generation element is a Fresnel mirror that has a plurality of orbicular zones and steps connecting adjacent orbicular zones to each other and that takes the orbicular zones as reflecting mirrors. A depth “d” of the steps is set substantially one-half of a wavelength λ, and a depth d	04-01-2010

Patent application number	Description	Published
20090040893	Optical pickup device and optical disk device - An optical pickup device or an optical disk device includes: a light source	02-12-2009
20090040910	Optical pickup device and optical disk device - A light source emits light with a first wavelength and light with a second wavelength longer than the first wavelength toward an optical disk from adjacent positions. An optical receiver detects light reflected from the optical disk. An astigmatism-generating element generates light used for focus control in a condition where a focusing position on one of two perpendicular cross sections including an optical axis of the light reflected from the optical disk is located ahead of the optical receiver and a focusing position on the other cross section is located behind the optical receiver are included. The astigmatism-generating element is a Fresnel mirror configured to include a plurality of reflecting mirrors. A level difference between the reflecting mirrors adjacent to each other is distributed in a range from a depth of substantially (natural number/2) times the first wavelength to (natural number/2) times the second wavelength	02-12-2009

Patent application number	Description	Published
20090267369	PEDESTRIAN PROTECTION APPARATUS FOR VEHICLE - A pedestrian protection apparatus is provided which prevents occurrence of bending deformation resulting from thermal contraction after the molding of a resin base member. The apparatus includes a resin base member that is fixed to a vehicle at a rear portion thereof and a plurality of reinforcing beads that extend in a front to back direction of the vehicle and space apart from each other in a vehicle width direction at a front portion of the base member. On a portion of the base member positioned between mutually adjacent ones of these reinforcing beads is integrally formed a planar connecting rib extends in a direction perpendicular to an extending direction of the reinforcing beads, so that mutually opposing surfaces of the adjacent reinforcing beads are connected to each other by the connecting rib.	10-29-2009