Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head
It is therefore an object of the present invention to provide a new and improved optical head device for use in an optical record and read/write apparatus. It is another object of the invention to pro... Read More
Inventors: Hoshino, Isao; Wachi, Shoko; Honguh, Yoshinori; Tanaka, Masahiko;, Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP) |
Method of using a single pick-up head to read and store data on discs of different thicknesses and structure of a pick-up head apparatus therefor
The present invention has been accomplished under the circumstances in view. According to the present invention, the method of using a single pick-up head to read and store data in CD (compact disc) a... Read More
Inventors: Chen, Tzu-Kan; Tzou, Chyr-Pwu; Chen, Jyh-Horng;, Assignee: Sampo Corporation (Taipei, TW) |
Optical head and optical data recording and reproducing apparatus having the same
According to one aspect of the invention, the optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and... Read More
Inventors: Hayashi, Hideki; Mizuno, Sadao; Ito, Noboru; Urairi, Kenichiro; Komma, Yoshiaki;, Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP) |
Device for optically scanning a recording medium by focusing the best focus or the paraxial focus to the information layer
It is an object of the invention to provide a device for optically scanning a record carrier, which has a simple construction and an improved utilisation of the optical power emitted by the radiation ... Read More
Inventors: Braat, Josephus J. M.; Ubbens, Igolt P. D.; Coombs, James H.; Sonneveld, Jacob; Kroon, Jacobus P. C.; Jutte, Petrus T.;, Assignee: U.S. Philips Corporation (New York, NY) |
Objective lens for recording and reproducing for use in an optical information recording medium
An object of the invention is to make it possible that recording and reproducing by means of optical disks having different substrate thicknesses are conducted in a single optical pickup device, and t... Read More
Inventors: Kobayashi, Masaya;, Assignee: Konica Corporation (Tokyo, JP) |
Optical pickup used with both DVD and CD
The present invention has been made to solve above-mentioned problems and it is an object of the invention to provide an optical pickup of a compatible type which can be switched for the DVD and CD on... Read More
Inventors: Ootaki, Sakashi; Iwasaki, Masayuki;, Assignee: Pioneer Electronic Corporation (Tokyo, JP) |
Correction elements to lower light intensity around an optical axis of an optical head with a plurality of focal points
An object of the present invention is to provide a light head apparatus which can read information more stably by decreasing disadvantages of higher optical intensity at the outside of a light beam wh... Read More
Inventors: Komma, Yoshiaki; Mizuno, Sadao; Hayashi, Hideki; Urairi, Kenichiro;, Assignee: Matsushita Electric Industrial Co., Ltd. (Kadoma, JP) |
Objective lens for optical pick-up head of optical disk drive
It is therefore the principle object of the present invention to provide an objective lens for optical pick-up head of optical disk drive devices capable of simplifying the focus switching mechanism. ... Read More
Inventors: Ju, Jau-Jiu; Yang, Tsung-Ming; Chang, Tsung-Kai;, Assignee: Industrial Technology Research Institute (Hsinchu, TW) |
Optical head
For solving the problem of the prior art, an optical head of the present invention comprises, light source, luminous flux splitting means for splitting radiation luminous flux of linearly polarized li... Read More
Inventors: Mizuno, Sadao; Korenaga, Tsuguhiro; Uchida, Shinji;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Compound objective lens having two focal points
A first object of the present invention is to provide, with due consideration to the drawbacks of such a conventional objective lens having a focal point, a compound objective lens having two focal po... Read More
Inventors: Komma, Yoshiaki; Mizuno, Sadao; Nishino, Seiji;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes
Therefore, it is an object of the present invention to provide an optical pickup device capable of reproducing discs of two kinds having different densities by forming double beam focuses of different... Read More
Inventors: Choi, Yang-Oh;, Assignee: Daewoo Electronics Co., Ltd. (Seoul, KR) |
Multiple focus lens, an optical head apparatus and an optical information recording-reproducing apparatus
In order to solve these and other problems, this invention aims to provide a multiple focus lens designed to substantially standardize the conditions for correction of coma for disks (recording media ... Read More
Inventors: Tanaka, Yasuhiro; Yamagata, Michihiro; Komma, Yoshiaki; Mizuno, Sadao;, Assignee: Matsushita Electric Industrial Co., Ltd. () |
Polarizing plate and liquid-crystal display containing the same
What is claimed is: 1. A polarizing plate comprising: a protective film, 5 to 150 μm thick, composed of cyclic-olefin-based resin having an anchor coat agent applied at least on one of the surfa... Read More
Inventors: Ishii, Yoshinori; Uesugi, Takao; Watanabe, Koichi;, Assignee: Gunze Co., Ltd. (Kyoto, JP); Poratechno Co., Ltd. (Niigata, JP) |
Polarization independent wavelength tunable filter based on birefringence compensation
It is an object of the present invention to provide a tunable, polarization independent wavelength filter utilizing birefringence compensation. It is a further object of the present invention to provi... Read More
Inventors: Wu, Chi;, Assignee: Northern Telecom Limited (Quebec, CA) |
Wavelength division multiplexer and demultiplexer
This invention is based on the observation that many filters have the characteristic property that the filter passes incident light of wavelengths within a characteristic wavelength band and reflect i... Read More
Inventors: Lee, Ho-Shang; Pesavento, Gerry; Polinsky, David;, Assignee: Dicon Fiberoptics (Berkeley, CA) |
Tunable filtering device for optical communications
To solve the above problems, it is an objective of the present invention to provide a tunable filtering device for optical communications, which has a simple configuration and an enhanced optical tran... Read More
Inventors: Jeong, Tae-san;, Assignee: Samsung Electronics Co., Ltd. (Kyungki-do, KR) |
Wavelength selection switches for optical application
This invention is based on the observation that, by making use of filters that selectively passes and reflects radiation of different wavelengths, it is possible to reduce the number of components as ... Read More
Inventors: Lee, Ho-Shang;, Assignee: Dicon Fiberoptics, Inc. (Berkeley, CA) |
All-optical holographic code division multiple access switch
These shortcomings and other limitations and deficiencies are obviated in accordance with the present invention by free-space optical switch, and concomitant method, based on the holographic CDMA tech... Read More
Inventors: Salehi, Jawad Ahmed; Abtahi, Mohammad;, Assignee: |
Three-dimensional image display device having an elementary hologram panel and method for manufacturing the elementary hologram panel
The present invention relates to a three-dimensional image display device for displaying a three-dimensional object and particularly to a three-dimensional display device which can change a representa... Read More
Inventors: Sato, Shunichi; Koide, Koushi;, Assignee: Sharp Kabushiki Kaisha (Osaka, JP) |
Method and apparatus for displaying three-dimensional images
What is claimed is: 1. A method for producing a three-dimensional image, comprising the steps of: simultaneously modulating a--preferably spatially coherent--light beam by a video signal containing th... Read More
Inventors: Balogh, Tibor;, Assignee: Holografica (Budapest, HU); Sony International (Europe) GmbH (Koln-Ossendorf, DE) |
Lens array and method of making same
FIG. 4 is a flowchart illustrating a method 400 in accordance with an embodiment of the present invention for fabricating a microlens array or a non-spherical lens. A substrate is first provided in s... Read More
Inventors: Tang, Yin S.;, Assignee: |
Optical signal processor, method of its control, method of its designing, and method of its production
The present invention has been accomplished in the light of the conventional technologies discussed above, and it has the following objectives: (1) To realize, in a single filter circuit, an optical s... Read More
Inventors: Jinguji, Kaname; Kawachi, Masao; Takiguchi, Koichi;, Assignee: Nippon Telegraph and Telephone Corporation (Tokyo, JP) |
Method and system for equalizing PMD using incremental delay switching
OF THE PREFERRED EMBODIMENTS The present invention is a PMD compensator based upon delay elements that use optical switching to add well-defined increments of delay to either polarization of an optic... Read More
Inventors: Robinson, Andrew Niall; Fee, John A.;, Assignee: MCI Communications Corporation () |
Polarization scrambler and integrated optical circuit making use thereof
What is claimed is: 1. A polarization scrambler comprising: a first splitter for splitting an incident signal light into two; a first optical path which is made of a material having an electrooptical ... Read More
Inventors: Naito, Takao;, Assignee: Fujitsu Limited (Kawasaki, JP) |
Fiber optic circulator
FIGS. 3 and 4 illustrate the difference in imaging which is fundamental to the operation of the present invention. In FIG. 3, illustrating a simplified view of the prior art, it is shown how light pr... Read More
Inventors: Frisken, Steven James;, Assignee: Australian Technology Park Photonic Technologies Pty. Ltd. (Eveleigh, AU) |
Method and apparatus for providing transformation of the polarization of light
In one aspect, the invention provides an optical apparatus for transforming the polarization of light from an input polarization to a selected output polarization. The optical apparatus includes a pai... Read More
Inventors: Wooten, Edward L.;, Assignee: Uniphase Telecommunciations Products, Inc. (Bloomfield, CT) |
Polarization mode dispersion compensation
An object of the invention is to provide a method of PMD compensation using a polarisation controller in association with a variable DGD compensation element, but without having to have recourse to th... Read More
Inventors: Farley, Kevin Stuart; Epworth, Richard Edward; Watley, Daniel;, Assignee: Nortel Networks Limited (St. Laurent, CA) |
Method for compensating polarization mode dispersion in a waveguide and a polarization mode dispersion compensator
The object of the present invention is thus to specify a method for PMD compensation and a PMD compensator which has numerous setting options and, within the transmission band in use, as far as possib... Read More
Inventors: Noe, Reinhold;, Assignee: Siemens Aktiengesellschaft (Munich, DE) |
Film confined to a frame having relative anisotropic expansion characteristics
The following terms should be understood in the description of the present invention according to the meanings ascribed below: "x-y plane" refers to any of a set of parallel planes indicating the gen... Read More
Inventors: Merrill, William W.; Harvey, John C.; Langlois, Reney R.; Mills, Michael W.; Peebles, Rosalind E.; Roska, Fred J.;, Assignee: 3M Innovative Properties Company (St. Paul, MN) |
Method for formatting partially overlapping holograms
In one embodiment of the present invention, a method of writing holograms includes: numbering sections in sequence, where each section has a spatial projection onto a holographic medium; and writing a... Read More
Inventors: Ayres, Mark R.;, Assignee: Inphase Technologies, Inc. (Longmont, CO) |
Optical Systems 
