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| Number | Title | Issue Date |
| 7907499 | Optical element, optical element manufacturing method and optical pickup device An optical element includes: opposing surfaces each including two areas each of which includes a fine-periodic structure. The fine-periodic structures of the two areas have different directions from each other in each of the opposing surfaces. One of the opposing su... | 03/15/2011 |
| 7782738 | Phase plate and optical head device A phase plate and an optical head device are provided, which are capable of suppressing changes of the amount of light incident on a light-receiving unit even if the phase difference caused by transmission through a protective layer of an optical recording medium di... | 08/24/2010 |
| 7660226 | Optical system, optical pickup apparatus, and optical disk apparatus The present invention discloses an optical system for extracting signal light components from a beam including the signal light components and stray light components. The optical system includes a condensing optical element situated on an optical path of the beam fo... | 02/09/2010 |
| 7355953 | Optical pickup for cutting off optical noise and optical recording and/or reproducing apparatus using the same An optical pickup includes a light source which emits light, a grating which separates a portion of the light emitted from the light source, a reflecting member which reflects another portion of the light emitted from the light source, a monitoring photodetector dis... | 04/08/2008 |
| 7355933 | Optical pickup device Substantially all of the laser light emitted from laser chip(s) 11 toward optical disk(s) 17 may be transmitted through polarizing hologram(s) 13 and may thereafter be transmitted through quarter-wave plate(s) 15, and after being reflecte... | 04/08/2008 |
| 7345820 | Optical pick-up apparatus A compatible optical pick-up apparatus, which records to and/or reproduce from both digital versatile disc (DVD)-type optical disks and compact disc (CD)-type optical disks for improving a signal regeneration capacity and a tracking capacity in operation at a high t... | 03/18/2008 |
| 7292517 | Optical scanning device for use with multiple types of record carrier surfaces An optical scanning device for scanning of a first, second and third type of optical record carrier with radiation of a first wavelength λ1, a second wavelength λ2 and a third wavelength λ3, respectively, where the three wavelengt... | 11/06/2007 |
| 7277377 | Optical pick-up device with a polarized light beam converter An optical pick-up device includes a light source (2), a polarized light beam converter (4), a splitter (6), a collimating lens (7), and a photo-detector (9). A linear polarized light beam with a first type of polarized component a... | 10/02/2007 |
| 7272099 | Exposure apparatus of an optical disk master, method of exposing an optical disk master and pinhole mechanism An exposure apparatus of an optical disk master having a laser source, a deflector for deflecting a recording laser beam obtained based on the laser beam of the laser source and an objective lens for focusing the recording laser beam on an optical disk master, has a... | 09/18/2007 |
| 7184387 | Optical scanning device An optical scanning device for scanning an optical record carrier comprising an information layer. Crosstalk cancellation is provided using a phase modulating element (40, 140) for generating a non-rotationally-symmetric phase profile in a subsidiary radiatio... | 02/27/2007 |
| 7113472 | Optical head including an active polymer film for switching voltage during recording and reproducing processes An optical head for recording or reproducing a signal with respect to an optical recording medium, which includes an optical element disposed between a light source and an optical recording medium. The optical element has an optically active polymer film in which an... | 09/26/2006 |
| 6920098 | Optical pick-up device having lens for first-order light beam convergence Disclosed is a lens for light collection for total reflection for a front monitor photodiode (PD) in an optical pick-up device. The optical pick-up device includes a light source provided with a holographic unit adapted to diffract a light beam, an optical disc arra... | 07/19/2005 |
| 6914870 | Optical head apparatus To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with a fewer parts. Of the light beam output from a semiconductor laser light source 101 | 07/05/2005 |
| 6839314 | Optical pickup An optical pickup is provided which includes a light source, an optical system for converging a laser beam emitted from the light source, and an optical element having a function of increasing a numerical aperture of the optical system, wherein recording and/or repr... | 01/04/2005 |
| 6674709 | Optical head apparatus To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with fewer parts. Of the output from a semiconductor laser light source, a peripheral com... | 01/06/2004 |
| 6614720 | Optical pickup device Beam shaping means may have a shaping ratio set to allow a light beam emitted from a semiconductor laser and having an elliptic intensity distribution to have an ellipticity of no more than two to obtain a spot achieving high light availability and reduce... | 09/02/2003 |
| 6463023 | Optical head and method for monitoring light source output in optical head An optical head includes a light source for generating a luminous flux, a polarization beam splitter, an object lens opposed to an appropriate recording medium, and a power monitoring device for monitoring the power of the luminous flux output from the li... | 10/08/2002 |
| 6373808 | Optical pick-up apparatus capable of eliminating a cross-talk component from adjacent tracks An optical pickup apparatus that is capable of eliminating a crosstalk component effectively. In the apparatus, a sub-beam for eliminating a crosstalk component is produced by utilizing a polarizing phase plate. The polarizing phase plate is provided with... | 04/16/2002 |
| 6167019 | Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards An optical disc reproducing apparatus includes a semiconductor laser, an objective lens converging a laser beam from the semiconductor laser on a recording surface of an optical disc, a polarization plane rotating unit selectively rotating the plane of po... | 12/26/2000 |
| 6160783 | Optical pick-up device An optical pick-up device includes an optical active element (11) which transmits an introduced laser beam (18) with its polarization direction (17) rotated by 90° in playback of a DVD and also transmits an introduced laser beam (18) without rotating its... | 12/12/2000 |
| 5917800 | Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes A beam generated from a laser light source are reflected by a beam splitter to proceed toward an optical disc. The beam focus onto the optical disc via a selective light-transmitting part installed in front of the optical disc and an objective lens. The b... | 06/29/1999 |
| 5790503 | Optical head An optical head has a light source, luminous flux splitting means for splitting radiation luminous flux of linearly polarized light radiated from the light source into plural luminous fluxes, a wavelength plate for polarizing at least one of the luminous ... | 08/04/1998 |
| 5719845 | Optical pick-up device composed of composite prism made of uniaxial crystal and non-axial crystal The present invention provides an optical pick-up device comprising a composite prism in which a prism made of non-axial crystal and a prism made of uniaxial crystal are adhered to each other and a grating, and separating into an extraordinary ray and an ... | 02/17/1998 |
| 5687153 | Optical head device and optical information apparatus using a lithium niobate hologram with divisional areas to diffract light to corresponding photo detector areas An optical head device includes: a light source for emitting a light beam; an objective lens for converging the light beam on an information storage medium; a hologram for receiving the light beam reflected by the information storage medium and generating... | 11/11/1997 |
| 5640380 | Optical head with a translucent plate to split a light beam Optical-beam 2 emitted from semiconductor laser device 1 is transformed into parallel-light 4 by means of collimator lens 3, and a part of parallel-light 4 passed through parallel glass-plate 7 of which the front-surface is mirror finished and the rear-su... | 06/17/1997 |
| 5612942 | Optical head A light radiated from a light source is focused to provide a light spot on an optical disc. A central portion of the radiated light is shielded, and a peripheral portion of the radiated light is modulated to have an intensity decreasing in an outer periph... | 03/18/1997 |
| 5450376 | Optical information recording/reproduction apparatus with super-resolution optical filter An optical information recording/reproducing apparatus realizes a direct verifying operation with a simple structure. A light beam emitted from a light source is converged on a track provided on an optical recording medium which is adapted to be moved rel... | 09/12/1995 |
| 5206852 | High-density recording optical head A high-density recording optical head for increasing recording density in an optical head for recording and reproducing information optically. The disclosed optical head is provided with an iris for transmitting or passing the central portion of the refle... | 04/27/1993 |
| 5097462 | Integrated optical pick-up device An optical pick-up device for use in an optical disc information recording/reproducing apparatus is provided. In the present optical pick-up device, the functions of two or more separate optical elements provided in the prior art structure are combined or... | 03/17/1992 |
| 4733277 | Apparatus for reproducing information from an optical disk An optical unit for focusing light on an optical disk in which laser light from a semiconductor laser is passed through a parallelpiped having a diffracting grating on its incident side before being focused on the optical disk. The angle, contained in the... | 03/22/1988 |
| 4577941 | Optical apparatus An optical apparatus is provided which comprises: a semiconductor laser having first and second emitting points for light emitted in the junction plane and perpendicular thereto, respectively; a cap element covering the semiconductor laser and having an a... | 03/25/1986 |
