 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: ... |
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| Lens array and method of making same |
| FIG. 4 is a flowchart illustrating a method 400 in accordance with an embodiment of the present ... |
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| 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 ... |
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| 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 ... |
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| Polarization scrambler and integrated optical circuit making use thereof |
| What is claimed is: 1. A polarization scrambler comprising: a first splitter for splitting an ... |
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| Fiber optic circulator |
| FIGS. 3 and 4 illustrate the difference in imaging which is fundamental to the operation of the ... |
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| 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 ... |
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| Polarization mode dispersion compensation |
| An object of the invention is to provide a method of PMD compensation using a polarisation ... |
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| 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 ... |
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Optical head
| Details |
Inventors: Mizuno, Sadao; Korenaga, Tsuguhiro; Uchida, Shinji;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Huber; Paul W.
Assistant Examiner:
Attorney, Agent or Firm: Ratner & Prestia
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 fluxes split by the luminous flux splitting means into a nearly circularly polarized light as illumination luminous flux, an objective lens for converging the illumination luminous flux on an optical information medium and collecting the reflected light, and a photo detector for receiving the reflected luminous flux, after passing through the wavelength plate and the luminous flux splitting means, wherein supposing a power efficiency when splitting the illumination luminous flux from the radiation luminous flux to be E1, a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component being orthogonal to a direction of polarization of the illumination luminous flux, to the photo detector to be E2, and a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component having substantially same direction as a direction of polarization of the illumination luminous flux, to the photo detector to be E3, the E2 is larger than the E1 and the E1.times.E3 is such amount that can be detected by the photo detector. |
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DETAILED DESCRIPTION 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 light radiated from the light source into plural luminous fluxes without changing the luminous flux diameter substantially, a wavelength plate for polarizing at least one of the luminous fluxes split by the luminous flux splitting means into a nearly circularly polarized light as illumination luminous flux, an objective lens for converging the illumination luminous flux through the wavelength plate on an optical information medium and collecting the reflected light, and a photo detector for receiving the reflected luminous flux collected by the objective lens, after passing through the wavelength plate and the luminous flux splitting means, wherein supposing a power efficiency when splitting the illumination luminous flux from the radiation luminous flux to be E1, a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component being orthogonal to a direction of polarization of the illumination luminous flux, to the photo detector to be E2, and a power efficiency when transmitting a polarized light component of the reflected luminous flux, the component having substantially same direction as a direction of polarization of the illumination luminous flux, to the photo detector to be E3, the E2 is larger than the E1 and the E1.
times.
E3 is such amount that can be detected by the photo detector.
Thus, by composing the luminous flux splitting means by splitting the light in the same direction of polarization as the light from the light source at a specific rate, and transmitting the light in the direction of polarization orthogonal to the light from the light source almost completely to the photo detector, if the birefringence of the optical disk is half wavelength, the photo detector can receive the light.
That is, by combination of birefringence of quarter wavelength plate and optical disk, if the light from the light source and the reflected light from the optical disk are same in the direction of polarization, the luminous flux splitting means can transmit the light to the photo detector
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