Abstract: Provided is a method of producing a liquid-cooled jacket wherein deformation of a seal body can be minimized.

Abstract: A method of manufacturing a heat transfer plate includes: an insertion process of inserting a heat medium pipe in a concave groove formed in a bottom face of a lid groove open to an obverse of a base member; a lid groove closing process of arranging a lid plate in the lid groove; and a main joining process of moving a main joining rotation tool along butt portions (V1, V2) between sidewalls of the lid groove and side faces of the lid plate, wherein in the main joining process a plastic fluidizing material (Q), where the base member and the lid plate are fluidized due to frictional heat, is made to flow in air gap portions (P1, P2) formed around the heat medium pipe.

Abstract: Provided is a method of producing a liquid-cooled jacket wherein deformation of a seal body can be minimized.

Abstract: Provided is a method of producing a liquid-cooled jacket wherein deformation of a seal body can be minimized.

Abstract: A method of manufacturing a heat transfer plate (1) includes: an insertion process of inserting a heat medium pipe (16) in a concave groove (8) formed in a bottom face of a lid groove (6) open to an obverse (3) of a base member (2); a lid groove closing process of arranging a lid plate (10) in the lid groove (6); and a main joining process of moving a main joining rotation tool (20) along butt portions (V1, V2) between sidewalls (5a, 5b) of the lid groove (6) and side faces (13a, 13b) of the lid plate (10), wherein in the main joining process a plastic fluidizing material (Q), where the base member (2) and the lid plate (10) are fluidized due to frictional heat, is made to flow in air gap portions (P1, P2) formed around the heat medium pipe (16).

Abstract: Provided is a method of producing a liquid-cooled jacket wherein deformation of a seal body can be minimized.

Abstract: A method of manufacturing a heat transfer plate (1) includes: an insertion process of inserting a heat medium pipe (16) in a concave groove (8) formed in a bottom face of a lid groove (6) open to an obverse (3) of a base member (2); a lid groove closing process of arranging a lid plate (10) in the lid groove (6); and a main joining process of moving a main joining rotation tool (20) along butt portions (V1, V2) between sidewalls (5a, 5b) of the lid groove (6) and side faces (13a, 13b) of the lid plate (10), wherein in the main joining process a plastic fluidizing material (Q), where the base member (2) and the lid plate (10) are fluidized due to frictional heat, is made to flow in air gap portions (P1, P2) formed around the heat medium pipe (16).

Abstract: An optical pickup including a light source unit having a first radiating unit for radiating a light beam of a first wavelength, a second radiating unit for radiating a light beam of a second wavelength and a third radiating unit for radiating a light beam of a third wavelenght, a collimator lens having different focal lengths dependent on the first to third wavelengths, and an objective lens for condensing light beams, radiated from the first to third radiating units, on an information recording surface of an optical disc, and a recording and/or reproducing apparatus employing the optical pickup, are disclosed. The optical pickup and the recording and/or reproducing apparatus are used for recording and/or reproducing the information for plural sorts of the information recording medium of different formats. Certain components of the optical pickup are used in common for the different light beams to reduce the size of the device as well as to correct the spherical aberration.

Abstract: An objective lens actuator has a fixed block fixedly mounted on a movable base and a movable block movable with respect to the fixed block in focusing directions toward and away from recording surfaces of the disc-shaped recording mediums and tracking directions which are substantially radial directions of the disc-shaped recording mediums. A first objective lens is mounted on the movable block for focusing a first laser beam onto the recording surface of a digital versatile disc or a compact disc. A second objective lens is mounted on the movable block for focusing a second laser beam, which has a wavelength shorter than the first laser beam, onto the recording surface of a Blu-ray Disc. The first objective lens and the second objective lens are spaced from each in a tangential direction of recording tracks on the disc which is perpendicular to the focusing directions and the tracking directions.

Abstract: An optical pickup apparatus includes a semiconductor laser for emitting laser light with a wavelength of at least from 400 nm to 415 nm and of which plane parallel to an active layer is located substantially in parallel to the recording surface of an optical recording medium and a reflection surface for reflecting laser light emitted from the semiconductor laser in the direction substantially perpendicular to the recording surface of the optical recording medium, the laser light being irradiated on the optical recording medium through an objective lens to record and/or reproduce the optical recording medium, wherein an angle ? formed between the direction of rays of light introduced into the reflection surface from the semiconductor laser and the direction in which recording tracks of the optical recording medium are extended is selected so as to satisfy: 45°??<90° Then, in an optical pickup apparatus and an optical recording and reproducing apparatus that can suitably applied to an optical recording medi

Abstract: An optical pickup including a light source unit having a first radiating unit for radiating a light beam of a first wavelength, a second radiating unit for radiating a light beam of a second wavelength and a third radiating unit for radiating a light beam of a third wavelength, a collimator lens having different focal lengths dependent on the first to third wavelengths, and an objective lens for condensing light beams, radiated from the first to third radiating units, on an information recording surface of an optical disc, and a recording and/or reproducing apparatus employing the optical pickup, are disclosed. The optical pickup and the recording and/or reproducing apparatus are used for recording and/or reproducing the information for plural sorts of the information recording medium of different formats. Certain components of the optical pickup are used in common for the different light beams to reduce the size of the device as well as to correct the spherical aberration.