Abstract: There is provided a lighting device including: a light emitting module having at least one light emitting device outputting light and a light emitting device board on which the at least one light emitting device is disposed; a housing installed on one side of a ring in a central axis direction relatively to the light emitting device board; and a resin globe installed to cover the light emitting module, wherein the globe has a plurality of protrusions formed by retaining at least a portion of a gate unit used in molding the globe, and the light emitting device board may have notch portions combined with the protrusions.

Abstract: There is provided a lighting device including: a light emitting module having at least one light emitting device outputting light and a light emitting device board on which the at least one light emitting device is disposed; a housing installed on one side of a ring in a central axis direction relatively to the light emitting device board; and a resin globe installed to cover the light emitting module, wherein the globe has a plurality of protrusions formed by retaining at least a portion of a gate unit used in molding the globe, and the light emitting device board may have notch portions combined with the protrusions.

Abstract: An optical pick-up apparatus for reproducing information recorded on an optical recording medium or recording information on the optical recording medium is provided. The optical pick-up apparatus includes a light source unit which generates beams; a diffraction element which diffracts the generated beams; and an objective lens which focuses a p order diffracted beam which is used for recording and reproducing information among a plurality of diffracted beams which are diffracted by the diffraction element on any one of a plurality of information layers which are formed on an optical recording medium. A p±1 order diffracted beam which is not used for recording and reproducing information is focused away from the plurality of information recording layers and on the surface of the optical recording medium.

Abstract: An optical pickup device is provided. The device includes a semiconductor laser light source which outputs linearly-polarized light having an elliptical shape, an objective lens which focuses light outputted from the semiconductor laser light source, forming an optical spot on an optical disc; and a polarization plate which is disposed placed on an optical path between the semiconductor laser light source and the objective lens, and which polarizes the light outputted from the semiconductor laser light source and transmits elliptically-polarized light, wherein the polarization plate is disposed such that a major axis of the elliptical polarization of the light transmitted by the polarization plate is parallel to or perpendicular to a major axis of the elliptical shape of the light.

Abstract: An optical pick-up apparatus for reproducing information recorded on an optical recording medium or recording information on the optical recording medium is provided. The optical pick-up apparatus includes a light source unit which generates beams; a diffraction element which diffracts the generated beams; and an objective lens which focuses a p order diffracted beam which is used for recording and reproducing information among a plurality of diffracted beams which are diffracted by the diffraction element on any one of a plurality of information layers which are formed on an optical recording medium. A p±1 order diffracted beam which is not used for recording and reproducing information is focused away from the plurality of information recording layers and on the surface of the optical recording medium.

Abstract: An aspheric lens includes at least one aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65°. The aspheric lens surface is given by the equation Z ? ( r ) = cr 2 1 + 1 - ( 1 + K ) ? c 2 ? r 2 + Lr 2 + Ar 4 + Br 6 + Cr 8 + Dr 10 + Er 12 + Fr 14 + Gr 16 + Hr 18 + Jr 20 where L?0, c is a curvature, r2=x2+y2, K is a conic integer, and L and A through J are aspheric coefficients.

Abstract: An optical pickup apparatus includes a light generating unit to generate a light to record or reproduce information, an objective lens to focus the light generated from the light generating unit onto a disk, and a multi-sectional polarizer disposed on a light path between the light generating unit and the objective lens and divided into a plurality of sectors having their individual optical axes.

Abstract: An optical beam forming apparatus capable of forming a polarization of laser beam into an elliptic polarization includes a beam source to emit a semiconductor laser beam, a wave plate to receive the beam emitted from the beam source and to form an elliptic polarization, and a lens to focus the beam passed through the wave plate to form a beam spot on a disc.

Abstract: An optical pickup includes a collimator lens having a diverging lens and a converging lens, such that it maintains a constant focal length and has a short optical path length. The collimator lens of the optical pickup device includes a diverging lens located at the side of a light source and a converging lens located at the side of generating parallel light or gentle oscillation light. In addition, the diverging lens and the converging lens of the collimator lens may be integrated, or may also be formed of a hologram optical element. As a result, the optical pickup device can be configured in the form of a slim structure using the collimator lens having a short optical path length.

Abstract: An optical pickup apparatus includes a light generating unit to generate a light to record or reproduce information, an objective lens to focus the light generated from the light generating unit onto a disk, and a multi-sectional polarizer disposed on a light path between the light generating unit and the objective lens and divided into a plurality of sectors having their individual optical axes.

Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low-density recording medium, a second objective lens having a high NA suitable for a high-density recording medium, a first light source to generate a short-wavelength optical signal to use the first and second objective lenses, a first photo-detector to receive an optical signal, which is generated from the first light source, is focused on a recording medium by the first and second objective lenses, and is then reflected from the recording medium, and a beam splitter to perform a division of the optical signal generated from the first light source, to direct some parts of the divided optical signal to the first objective lens, and to direct the other parts of the divided optical signal to the second objective lens.

Abstract: An object lens for an optical disk may include an aspherical lens surface, and an aspherical equation, which may be applied to form the aspherical lens surface may include two 2nd order function terms. Accordingly, a lens, which has a high numerical aperture (NA) and also has a small flexure on a lens surface or aberration, is provided.

Abstract: An aspheric lens includes at least one aspheric lens surface, and an angle of inclination on the aspheric lens surface is smaller than or equal to 65°. The aspheric lens surface is given by the equation Z ? ( r ) = cr 2 1 + 1 - ( 1 + K ) ? c 2 ? r 2 + Lr 2 + Ar 4 + Br 6 + Cr 8 + Dr 10 + Er 12 + Fr 14 + Gr 16 + Hr 18 + Jr 20 where L?0, c is a curvature, r2=x2+y2, K is a conic integer, and L and A through J are aspheric coefficients.

Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low-density recording medium, a second objective lens having a high NA suitable for a high-density recording medium, a first light source to generate a short-wavelength optical signal to use the first and second objective lenses, a first photo-detector to receive an optical signal, which is generated from the first light source, is focused on a recording medium by the first and second objective lenses, and is then reflected from the recording medium, and a beam splitter to perform a division of the optical signal generated from the first light source, to direct some parts of the divided optical signal to the first objective lens, and to direct the other parts of the divided optical signal to the second objective lens.

Abstract: It is an object of the invention to provide an estimation method of fluorescent dye's concentration from multiple fluorescence, where the accurate estimation of the fluorescent dye's concentration of each fluorescent dye from multiple fluorescence is made possible and the separation of multiple fluorescence which is difficult in the prior art is made possible.

Abstract: Disclosed herein is an optical pickup device and method of adjusting the same. The optical pickup device and method of adjusting the same of the present invention can correct aberrations due to variation of thickness of an optical disc and dispersion of the emission wavelength by a semiconductor laser, which are generated in manufacturing processes of the optical disc and the optical pickup device, correct aberrations generated in recording/reproducing of the optical disc, due to variation of the emission wavelength and secular changes in the environment of the semiconductor laser, simplify and miniaturize the construction of the optical pickup device, and easily reduce manufacturing cost thereof. The optical pickup device of the present invention has a semiconductor laser (1) and a photo diode (13) for narrowing light emitted from the semiconductor laser (1) to a predetermined diameter and for detecting light reflected and returned from an optical disc (14).

Abstract: Disclosed herein is a light irradiating device, optical pickup device with the same, and method of adjusting the light irradiating device. The light irradiating device has a light emitting device, a lens system and a secondary lens. The lens system narrows light emitted from the light emitting device to a predetermined diameter. The secondary lens is disposed between the light emitting device and the lens system. Each of the light emitting device and the secondary lens is fixed to an arbitrary position on the optical axis while allowing the light emitting device and the secondary lens to move independently along an optical axis. According to the present invention, the light irradiating device can obtain light use efficiency and a uniform light intensity distribution required for recording/reproducing of an optical information recording medium.

Abstract: An optical pickup apparatus includes a wavelength selecting numeral aperture limiting element and a wavelength selecting beam splitter to record data on and reproduce data from three different optical discs, such as CD, DVD, and HD-DVD, each having different thickness of a protective layer and information recording density. The wavelength selecting numeral aperture limiting element of the optical pickup apparatus includes a first filter and a second filter disposed on respective sides of a transparent element to change a numeral aperture of an objective lens into three different numeral apertures in response to three different beams. The first filter disposed on an optical path to receive first, second, and third beams includes a first region transmitting the first laser beam and a second region disposed within the first region to transmit the first, second, and third laser beams.

Abstract: Disclosed herewith is a wavelength coupling device which transmits three types of light having three different wavelengths, is composed of a hologram device, is characterized in that at least one type of light of the three types of light incident on the optical transmission medium is emitted at an angle different from its incident angle and the others types of light emitted at angles equal to their incident angles, respectively.

Abstract: Disclosed herein is a light irradiating device, optical pickup device with the same, and method of adjusting the light irradiating device. The light irradiating device has a light emitting device, a lens system and a secondary lens. The lens system narrows light emitted from the light emitting device to a predetermined diameter. The secondary lens is disposed between the light emitting device and the lens system. Each of the light emitting device and the secondary lens is fixed to an arbitrary position on the optical axis while allowing the light emitting device and the secondary lens to move independently along an optical axis. According to the present invention, the light irradiating device can obtain light use efficiency and a uniform light intensity distribution required for recording/reproducing of an optical information recording medium.