Optical information processing apparatus having small optical system using a plurality of beam expanding elements
First Claim
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1. An optical information processing apparatus, comprising:
- a laser diode;
a first optical element having at least one of a prism, a grating, and a cylindrical lens, for deflecting a light beam projected from said laser diode along a direction substantially perpendicular to a surface of an information recording medium, and also for expanding the light beam in one direction at a cross section perpendicular to a light beam traveling direction; and
a second optical element having at least one of a prism, a grating, and a cylindrical lens, for expanding the light beam in another direction at a cross section perpendicular to another light beam traveling direction; and
wherein one of said first and second optical elements causes a light beam expansion magnification along a short axial direction of an elliptical-shaped light intensity distribution in a far-field image of the light beam projected from said laser diode which is greater than a light beam expansion magnification of the other of said first and second optical elements along a long axial direction of said intensity distribution.
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Abstract
An optical information processing apparatus includes a laser diode, a first prism or a grating for deflecting a light beam projected from the laser diode along a direction substantially perpendicular to a surface of an information recording medium and also for expanding a cross section of the light beam along one direction, an objective lens for focusing the light beam onto the surface of the information recording medium, and a second prism or a grating for expanding the cross section of the light beam along one direction.
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3 Claims
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1. An optical information processing apparatus, comprising:
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a laser diode; a first optical element having at least one of a prism, a grating, and a cylindrical lens, for deflecting a light beam projected from said laser diode along a direction substantially perpendicular to a surface of an information recording medium, and also for expanding the light beam in one direction at a cross section perpendicular to a light beam traveling direction; and a second optical element having at least one of a prism, a grating, and a cylindrical lens, for expanding the light beam in another direction at a cross section perpendicular to another light beam traveling direction; and wherein one of said first and second optical elements causes a light beam expansion magnification along a short axial direction of an elliptical-shaped light intensity distribution in a far-field image of the light beam projected from said laser diode which is greater than a light beam expansion magnification of the other of said first and second optical elements along a long axial direction of said intensity distribution. - View Dependent Claims (2, 3)
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Specification