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AssigneeKonica Corporation
InventorsKazumi Furuta, Yuichi Akanabe, Masahiro Morikawa, Osamu Masuda
Estimating the term…
An optical element is provided with a first optical surface; a second optical surface opposite to the first optical surface so that a light flux incident onto the first optical surface and is emitted from the second optical surface, wherein at least one of the first and second optical surfaces is a curved optical surface having a refracting power; and a cyclic pattern structure having the characteristic of form birefringence and provided on the curved optical surface, wherein a distance of a pitch of a pattern in the cyclic pattern structure is smaller than the wavelength of the light flux.
An optical element, comprising:
An optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, comprising:
Dependencies are inferred from the claim text.
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Anti-reflection coatings: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
Diffraction gratings: with pitch less than or comparable to the wavelength
Plural gratings positioned on the same surface, e.g. array of gratings: in an overlapping or superposed manner
Diffraction gratings: comprising birefringent materials
Term end not estimated
The present invention relates to an optical element, a base material, a metal mold therefor, an optical pickup device, an optical element processing method, a base material processed by the aforementioned method, and an electron beam pattern-drawing apparatus, and in particular, to an objective lens that is manufactured through an injection molding method and is of hologram structure and of double refraction phase structure.
Heretofore, CD and DVD, for example, have been used widely as an information recording medium, and many optical elements have been used in a precision device such as a reading device (magneto-optical disk device) that reads the aforementioned recording media.
What is shown in FIG. 36, for example, is given as an example of an optical pickup device such as a reading device employing the optical element stated above exemplified by an optical lens.
FIG. 1 is an illustration showing an example of a schematic structure of a base material (optical element) relating to an embodiment of the invention.
FIG. 2 is an illustration showing an example of a schematic structure of a hologram structure of a base material (optical element) relating to an embodiment of the invention.
FIG. 3 is an illustration showing an example of a schematic structure of a double refraction phase structure (wavelength plate structure) of a base material (optical element) relating to an embodiment of the invention.
(Embodiment of the Invention)
An example of the preferable embodiment of the invention will be explained concretely as follows, referring to the drawings.
(Explanation of Structure of Optical Element)