Abstract:
An optical pickup device compatible with two types of optical recording media in accordance with the present invention includes: a first light source emitting a first laser beam with a first wavelength; a second light source emitting a second laser beam with a second wavelength greater than the first wavelength; an objective lens with parameters according with the first wavelength and adapted to focus the first and second laser beams on the at least two types of optical recording media; a collimating lens for collimating an incident beam of light and transmitting the collimated light beam to the objective lens; an optical path synthesizer/separator for receiving the first and second laser beams and transmitting the first and second laser beams to the collimating lens; and a compensator for correcting the second laser beams and transmitting the corrected second laser beams to the optical path synthesizer/separator.
Abstract:
An optical pickup head for an information recording and/or reproducing device compatible with two types of optical recording media is provided. The pickup head includes a first light source (1a) emitting a first wavelength beam, a second light source (1b) emitting a second wavelength beam, a photo detector (2) receiving the first and second beams, a hologram unit deviating the first and second beams onto the receiving member, a prism (4), a collimating lens (50) for collimating at least one of the first and second beams into a parallel beam, and an objective lens (60) for focusing the two beams to the two types of optical recording media respectively. The prism unit includes first and second portions for transmitting the first and second beams, a third portion for transmitting both the first and second beams, and an aberration-correcting portion for one of the first and second beams to pass therethrough.
Abstract:
An optical pickup head compatible with multiple optical recording media includes three light sources, a prism unit disposed beside the light sources, a reflective multi-surface prism disposed beside the prism unit for multiple reflecting light beams therethrough, a collimating lens disposed beside the reflective multi-surface prism for collimating light beams there through, and an objective lens. The prism unit includes a first portion facing the first light source for passing the first light beam therethrough, a second portion facing the second light source for passing the second light beam therethrough, a third portion facing the third light source for passing the third light beam therethrough, a first aspherical surface for correcting aberrations of the first light beam caused by non-matching, and a second aspherical surface for correcting aberrations of the second light beam caused by non-matching.
Abstract:
An optical pickup head compatible with two different optical recording media includes a first semiconductor module emitting a first light beam with a first wavelength; a second semiconductor module emitting a second light beam with a second wavelength greater than the first wavelength; a prism module including a reflective multi-surface prism for changing a transmission direction of a light beam passing therethrough by reflecting the light beam between surfaces thereof, an optical path coupler disposed between the first and second semiconductor modules and the reflective multi-surface prism for coupling the first and second light beams and transmitting the first and second light beams toward the reflective multi-surface prism, and an aspherical surface for converging the second light beam; and an objective lens for receiving the first and second light beams and transmitting the first and second light beams to two different recording media respectively.
Abstract:
An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), a second lens (23), and a third lens (24). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section of the elliptical light beam emitted from the light source defines a long axis and a short axis which are perpendicular to each other. The first lens, the second lens, and the third lens are used for reconfiguring the elliptical light beam, thus obtaining a round light beam having equivalent short axis and long axis, and equivalent diverging angles in both horizontal direction and vertical direction. Optical centers of the first lens, the second lens, and the third lens commonly define a common optical axis along which the elliptical light beams travels.
Abstract:
An optical pickup system includes a first light source emitting first light beams with a first wavelength, a second light source emits second light beams with a second wavelength greater than the first wavelength, a third light source emits third light beams with a third wavelength greater than the second wavelength, a composite prism comprising a first prism facing the first and second light sources, a second prism facing the third light source, and a third prism for receiving the first, second and third light beams from the first and second prisms, the first prism has a surface facing the first and second light sources, the surface defines first and second regions, the second region has an aspherical surface to compensate aberration of the second light beams, a collimating lens and objective lens disposed in a common optical path for transmitting the three light beams from the composite prism.
Abstract:
An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), and a second lens (23). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section of the elliptical light beam emitted from the light source defines a long axis and a short axis which are perpendicular to each other. The first lens and the second lens are used for reconfiguring the elliptical light beam, thus obtaining a round light beam having equivalent short axis and long axis, and equivalent diverging angles in both horizontal direction and vertical direction.
Abstract:
An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), a second lens (23), and a third lens (24). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section of the elliptical light beam emitted from the light source defines a long axis and a short axis which are perpendicular to each other. The first lens, the second lens, and the third lens are used for reconfiguring the elliptical light beam, thus obtaining a round light beam having equivalent short axis and long axis, and equivalent diverging angles in both horizontal direction and vertical direction. Optical centers of the first lens, the second lens, and the third lens commonly define a common optical axis along which the elliptical light beams travels.
Abstract:
An optical pickup system includes a first light source emitting first light beams with a first wavelength, a second light source emits second light beams with a second wavelength greater than the first wavelength, a third light source emits third light beams with a third wavelength greater than the second wavelength, a composite prism comprising a first prism facing the first and second light sources, a second prism facing the third light source, and a third prism for receiving the first, second and third light beams from the first and second prisms, the first prism has a surface facing the first and second light sources, the surface defines first and second regions, the second region has an aspherical surface to compensate aberration of the second light beams, a collimating lens and objective lens disposed in a common optical path for transmitting the three light beams from the composite prism.
Abstract:
A method for designing an aspheric spectacle lens includes: designing a spherical spectacle lens, the spherical spectacle lens having a first surface being substantially flat, and a second surface being spherical and having a predetermined lens power; and correcting aberration of the spherical spectacle lens by changing the second surface into an aspheric surface. The second step includes: defining an aspheric surface by an aspheric-surface function, parameters of the function including a conic constant and at least one aspheric-surface coefficient; defining a merit function, the merit function having a parameter of inflection point, the parameter of inflection point being described with the conic constant and the aspheric-surface coefficient of the aspheric-surface function; and calculating a resolution of the merit function by a damped least square method.