Abstract: An optical pickup apparatus and an optical recording/reproducing system including the same, the optical pickup apparatus includes at least two optical systems for different types of optical recording media, one of objective lenses of the optical systems being offset from a central line of the optical recording medium, wherein the optical system including the offset objective lens having a diffraction grating diffracting light emitted from a light source to form a main beam and sub-beams, wherein the diffraction grating includes first and second diffraction regions having different grating patterns arranged alternately thereon, and a center of each sub-beam is arranged at a boundary of the first and second diffraction regions of the diffraction grating, and a center of the diffraction grating and an optical axis of the light source are adjusted to be coincided with each other, preventing generation of an alternating current in a Push-Pull signal of the sub-beams.

Abstract: An optical pickup includes a light source module in which first and second light sources that emit first and second light beams of different wavelengths are integrated into a single package, an objective lens that focuses the first and second light beams to form a light spot on a recording surface of a recording medium, a light path changer that changes a path along which the first and second light beams propagate, a photodetector that receives the first and second light beams entered via the objective lens and the light path changer and detects an information signal and/or error signal, and an optical element disposed on a path along which the first and second light beams propagate to act as a lens with respect to only one of the first and second light beams so as to correct a position difference along a light propagation direction between the first and second light sources.

Abstract: An optical pickup using a two-wavelength light source module includes a light source module, a collimating lens, and a first optical element. The light source module includes first and second light sources which emit first and second light beams of different wavelengths and are formed in a single package. The collimating lens directs the first and/or second light beams into convergent light or divergent light so that the convergent light or the divergent light is incident on the objective lens. The optical pickup is a finite optical system due to the collimating lens. The first optical element is disposed on the traveling paths of the first and second light beams, operates as a lens only for one of the first and second light beams, and corrects a position difference between the first and second light sources along a traveling direction of light.

Abstract: A multipurpose hinge apparatus having an automatic return function is provided in which the apparatus is installed between the door and a main body. The apparatus includes a driving mechanism for ascending and descending a piston rod according to opening and closing of the door which is installed in the upper portion of a cylindrical housing. A piston is connected with the piston rod, in which a one-direction check valve is installed in the piston. The piston partitions an upper chamber and a lower chamber and ascends and descends in association with the piston rod. A first oil path communicates with the upper and lower chambers via the lower portion of the piston rod in the central portion of the piston. A compression spring which makes the piston ascend is inserted into the lower chamber. Oil is filled in the chamber.

Abstract: An optical pickup which, when a first light reflected by a recording medium is divided into a central light area and first and second peripheral light areas at both sides of the central light area, divides the first light reflected by the recording medium into at least 6 light areas, and the at least 6 light areas are independently detected from first through sixth light-receiving portions of a photodetector. Hence, the photodetector can detect a tracking error signal whose offset generation due to a shift of an objective lens is insensitive and whose offset generation due to an initial photodetector balance deviation is depressed.

Abstract: A multipurpose hinge apparatus having an automatic return function is provided in which the apparatus is installed between the door and a main body. The apparatus includes a driving mechanism for ascending and descending a piston rod according to opening and closing of the door which is installed in the upper portion of a cylindrical housing. A piston is connected with the piston rod, in which a one-direction check valve is installed in the piston. The piston partitions an upper chamber and a lower chamber and ascends and descends in association with the piston rod. A first oil path communicates with the upper and lower chambers via the lower portion of the piston rod in the central portion of the piston. A compression spring which makes the piston ascend is inserted into the lower chamber. Oil is filled in the chamber.

Abstract: An optical pickup includes: a first light module which records information on and/or reproduces information from a first optical recording medium having a first format, radiates a first beam having a first wavelength, and receives the first beam reflected from the first optical recording medium to detect an information signal and an error signal; a second light module which records information on and/or reproduces information from a second optical recording medium having a second format different from the first, radiates a second beam having a second wavelength different from the first, and receives the second beam reflected from the second optical recording medium to detect an information signal and an error signal; a beam splitter disposed along paths of the first and second beams and which changes the paths of the first and second beams; and an objective lens which condenses the first and second light beams to form a light spot on the first and second optical recording media, respectively.

Abstract: An optical pickup apparatus including a first light source to emit light; light transmitting and/or reflecting units to affect the emitted light as the emitted light is transmitted and/or reflected to an optical information storage medium; and a phase shift coating layer provided on at least one of the light transmitting and/or reflecting units to change a polarization state of the emitted light.

Abstract: An optical pickup using a two-wavelength light source module includes a light source module, a collimating lens, and a first optical element. The light source module includes first and second light sources which emit first and second light beams of different wavelengths and are formed in a single package. The collimating lens directs the first and/or second light beams into convergent light or divergent light so that the convergent light or the divergent light is incident on the objective lens. The optical pickup is a finite optical system due to the collimating lens. The first optical element is disposed on the traveling paths of the first and second light beams, operates as a lens only for one of the first and second light beams, and corrects a position difference between the first and second light sources along a traveling direction of light.

Abstract: An optical pickup to focus a light emitted from a light source using an objective lens, forming a light spot on a recording surface of a recording medium, and performing recording and/or reproducing operations using the light. The optical pickup includes a monitor photodetector and an optical element installed in front of the monitor photodetector to receive and to detect a portion of the light emitted from the light source to control an amount of light power output from the light source and to adjust at least one of an intensity, a beam profile, and a proceeding direction of the light incident on the monitor photodetector.

Abstract: An optical pickup includes a light source module in which first and second light sources that emit first and second light beams of different wavelengths are integrated into a single package, an objective lens that focuses the first and second light beams to form a light spot on a recording surface of a recording medium, a light path changer that changes a path along which the first and second light beams propagate, a photodetector that receives the first and second light beams entered via the objective lens and the light path changer and detects an information signal and/or error signal, and an optical element disposed on a path along which the first and second light beams propagate to act as a lens with respect to only one of the first and second light beams so as to correct a position difference along a light propagation direction between the first and second light sources.