Abstract: An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.

Abstract: An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light source into a main light beam and sub-light beams which are symmetrical with respect to the main light beam and irradiates the split light beams on a recording medium, and a light detection device which receives the main light beam and the sub-light beams reflected by the recording medium, so as to detect a tracking error signal in a three-beam method and one of a push-pull method and an improved push-pull method.

Abstract: An optical pickup for a recording medium includes a light source, an objective lens, a main photodetector, and a front photodetector. The configuration of the optical pickup enables converging or diverging of light to be incident on a plate beam splitter so that light can be received at an effective light receiving region of a front photodetector without interference due to internal reflection occurring in the plate beam splitter. In the alternative, a wedge beam splitter in the optical pickup includes first and second mirror planes at a predetermined angle to transmit and reflect incident light at a predetermined ratio. In the optical pickup, an amount of light that is exactly proportional to an output power of the light source can be detected, where the output power of the light source can be accurately controlled, thereby improving a linearity of the output power of the light source.

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 compatible type optical pickup using a wedge type beam splitter that can record and/or reproduce information on/from optical recording media having different formats.

Abstract: An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.

Abstract: An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.

Abstract: A compatible type optical pickup using a wedge type beam splitter that can record and/or reproduce information on/from optical recording media having different formats.

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 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 condenses a light emitted from a light source using an objective lens and irradiates the light on an optical recording medium to record data on the optical recording medium and/or to reproduce the data recorded on the optical recording medium. The optical pickup includes an optical element adjusting a convergence and/or a divergence of the light emitted from the light source and proceeded to the objective lens.

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.

Abstract: An optical pickup for a recording medium includes a light source, an objective lens, a main photodetector, and a front photodetector. The configuration of the optical pickup enables converging or diverging of light to be incident on a plate beam splitter so that light can be received at an effective light receiving region of a front photodetector without interference due to internal reflection occurring in the plate beam splitter. In the alternative, a wedge beam splitter in the optical pickup includes first and second mirror planes at a predetermined angle to transmit and reflect incident light at a predetermined ratio. In the optical pickup, an amount of light that is exactly proportional to an output power of the light source can be detected, where the output power of the light source can be accurately controlled, thereby improving a linearity of the output power of the light source.

Abstract: An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power generated by one of a plurality of light sources, and an amplifying unit that selects a gain, amplifies the beam power received by the light-receiving unit according to the selected gain, and outputs the beam power amplified as a detected beam power. According to the apparatus and method, received beam power (or amplification gain) is amplified by a gain determined according to the characteristics of the respective light sources. Thus, it is possible to provide the detected beam power in consideration of a sufficient dynamic range for the each light source, thereby realizing effective APC.

Abstract: An optical pickup device includes a light source for emitting light, a beam splitter installed on an optical path of the light emitted from the light source for splitting the light, an objective lens for focusing a main light split by the beam splitter at an optical disk, a monitoring photodetector for receiving a sub-light split by the beam splitter and monitoring the amount of light output from the light source, a main photodetector for receiving the light emitted from the light source and reflected by the optical disk and passing through the beam splitter and detecting an error signal and an information signal, and a collimating lens installed on the optical path between the light source and the beam splitter for focusing both the main light and sub-light split by the beam splitter, so that the amount of light received by the monitoring photodetector increases.

Abstract: A compatible optical pick-up device includes a first light source to emit a first light, a second light source to emit a second light and having a wavelength that is different from that of the first light, a first optical path converter to reflect the first light irradiated from the first light source onto an optical path, a second optical path converter to reflect the first light from the first optical path converter and transmit the second light irradiated from the second light source onto the optical path, an objective lens to converge the light received from the second optical path converter towards an optical recording medium, and a photo-detector to receive an incident light reflected by the optical recording medium. The compatible optical pick-up device reduces the difference between transmissivities depending on the polarization status of the incident light by adopting a transmission-type optical path converter such that the optical recording medium is minimally affected by the birefringence.

Abstract: An optical recording/reproducing apparatus includes an optical pickup and a signal processor. The optical pickup includes an optical splitting device which splits light emitted from a first light source into a main light beam and sub-light beams which are symmetrical with respect to the main light beam and irradiates the split light beams on a recording medium, and a light detection device which receives the main light beam and the sub-light beams reflected by the recording medium, so as to detect a tracking error signal in a three-beam method and one of a push-pull method and an improved push-pull method.

Abstract: A compatible optical pickup capable of recording or reproducing information on or from compact disc (CD) family media such as CD rewritable (CD-RW) and digital versatile disc (DVD) by adopting a stepped planar lens having a plurality of gratings.