 Optical head |
| For solving the problem of the prior art, an optical head of the present invention comprises, light ... |
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| Compound objective lens having two focal points |
| A first object of the present invention is to provide, with due consideration to the drawbacks of ... |
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| 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, ... |
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| Polarization independent wavelength tunable filter based on birefringence compensation |
| It is an object of the present invention to provide a tunable, polarization independent wavelength ... |
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| Wavelength division multiplexer and demultiplexer |
| This invention is based on the observation that many filters have the characteristic property that ... |
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| Tunable filtering device for optical communications |
| To solve the above problems, it is an objective of the present invention to provide a tunable ... |
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| Wavelength selection switches for optical application |
| This invention is based on the observation that, by making use of filters that selectively passes ... |
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| All-optical holographic code division multiple access switch |
| These shortcomings and other limitations and deficiencies are obviated in accordance with the ... |
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Superresolution scanning optical device
| Details |
Inventors: Kato, Makoto; Kasazumi, Kenichi;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Davie; James W.
Assistant Examiner:
Attorney, Agent or Firm: Willian Brinks Hofer Gilson & Lione
A superresolution scanning optical device has image forming means for forming the image of light from a coherent light source unit in the form of a fine spot on a conjugate face through an image forming optical system, and scanning means for scanning the fine spot formed on the conjugate face. The coherent light source unit has first and second light sources of which phases are reverse to each other. The first and second light sources have the relationship that the main lobe of the image of the second light source on the conjugate face is superposed on the lateral sides of the main lobe of the image of the first light source on the conjugate face. |
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DETAILED DESCRIPTION A first superresolution scanning optical device according to the present invention comprises image forming means for forming the image of light from a coherent light source unit in the form of a fine spot on a conjugator or imaging face through an image forming optical system, and scanning means for scanning the fine spot formed on the conjugate face, the coherent light source unit having at least first and second light sources of which phases are reverse to each other, the first and second light sources having the relationship that the main lobe of the image of the second light source on the conjugate face is superposed on the lateral sides of the main lobe of the image of the first light source on the conjugate face.
Accordingly, the amplitudes of the lateral sides of the main lobe of the image of the first light source are cancelled by the amplitude of the main lobe of the image of the second light source, thus reducing the width of the main lobe of the image of the first light source.
It is therefore possible to obtain superresolution smaller than the diffraction limit without slit-like or annular openings formed.
Thus, with a simple optical system, superresolution can be achieved without the amount of light of the main lobe remarkably decreased.
In the first superresolution scanning optical device, the coherent light source unit may further include a third light source presenting the same phase as that of the first light source, and the second and third light sources may have the relationship that the main lobe of the image of the third light source on the conjugate face is superposed on the lateral sides of the main lobe of the image of the second light source on the conjugate face.
In such an arrangement, that remaining portion of the reverse phase component of the image of the second light source which has not been cancelled in the interference of the phase component of the image of the first light source with the reverse phase component of the image of the second light source, is cancelled by the regular phase component of the image of the third light source
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Optical Systems 
