Optical disk head including a light path having a thickness and width greater than the light beam wavelength by a predetermined amount
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorTeruhiro Shiono
Life of this patent
Estimating the term…
Abstract
An optical disk head which includes a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condenser optically connected to the light path so as to radiate the light beam propagated through the light path upon an object provided toward a top surface of the substrate, a second light condenser for guiding the light beam reflected from the object into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condenser.
Claims44
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, the first light condensing means being a diffractive optical component having a curved grating which comprises a plurality of curves which are bulged in the direction in which the light beam from the light source are propagated and symmetrical with respect to the center line of the propagating light beam.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, the second light condensing means being a diffractive optical component having a grating which comprises a plurality of curves which are bulged in the opposite direction to the direction in which the light beam introduced into the light path by the second light condensing means are propagated and symmetrical with respect to the center line of the propagating light beam.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, and a position detecting optical means comprising an optical beam splitter, the optical beam splitter being a reflex diffractive optical component disposed on the top surface of the substrate so as to face the optical recording medium, and including a pair of lenses, the pattern of each grating comprising a group of ellipses having equal eccentric ratios and major axes in the direction in which the light beam is propagated, wherein the centers of the ellipses are shifted one after another progressively in the opposite direction to the direction in which the light beam is propagated and the grating period diminishing toward the outside peripheries.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, and a position detecting optical means comprising an optical beam splitter, the optical beam splitter comprising a pair of reflex micro-Fresnel lenses disposed on the top surface of the substrate.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, the light path comprises a collimator for collimating the light beam propagated through the light path from the light source, the collimator being a reflex diffractive optical component, the collimator comprising gratings which include a plurality of ellipses having major axes in the direction in which the light beam is propagated, wherein the centers of the curves are shifted one after another progressively in the direction in which the light beam is propagated.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a first light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate, a second light condensing means for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the second light condensing means, the second light condensing means being a transmission diffractive beam splitter disposed on the top surface of the substrate, the split light beam being detected by the optical detector, the second light condensing means comprising a pair of gratings which includes a plurality of curves bulged in the opposite direction to the direction in which the light beam introduced by the second light condensing means into the light path are propagated therethrough, the curved being symmetrical with respect to the center line of the propagating light beam.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, and an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, the light condensing means being a diffractive optical component having a grating, the grating comprising a plurality of curves bulged in the direction in which the light beam from the light source is propagated, the grating being symmetrical with respect to the center line of the propagating light beam.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, and a position detecting optical means comprising an optical beam splitter, the beam splitter comprising a pair of curved gratings which are arranged perpendicularly to the direction in which the light beam is propagated, and are symmetrical to each other.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, and a position detecting optical means comprising an optical beam splitter, the beam splitter comprising a linear grating including a plurality of linear lines.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, and a position detecting optical means comprising an optical beam splitter, the optical beam splitter being a reflex diffractive optical component for diffracting the light beam introduced by the light condensing means into the light path and propagated therethrough so as to direct the light beam sideways of the direction of propagation, the light condensing means being a transmission type, and being disposed on the top surface of the substrate so as to radiate the light beam perpendicularly to the substrate, the beam splitter being disposed on the top surface of the substrate, and the optical detector and the light source being disposed on the bottom surface thereof, the beam splitter comprising a pair of curved gratings arranged laterally with respect to the light beam, and symmetrical to each other with respect to the light propagating direction.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, and a position detecting optical means comprising an optical beam splitter, the optical beam splitter being a reflex diffractive optical component for diffracting the light beam introduced by the light condensing means into the light path and propagated therethrough so as to direct the light beam sideways of the direction of propagation, the light condensing means being a transmission type, and being disposed on the top surface of the substrate so as to radiate the light beam perpendicularly to the substrate, the beam splitter being disposed on the top surface of the substrate, and the optical detector and the light source being disposed on the bottom surface thereof, the beam splitter comprising a linear grating including a plurality of linear lines.
An optical disk head comprising a substrate, a light path for allowing light beam to propagate in a zigzag form, having a thickness and width of at least 10 times greater than the wavelength, a light source optically connected to the light path so as to allow an incident light from the light source to propagate therethrough, a light condensing means optically connected to the light path so as to radiate the light beam propagated through the light path upon an optical recording medium provided over a top surface of the substrate and for guiding the light beam reflected from the optical recording medium into the light path, an optical detector for detecting the light beam propagated through the light path guided by the light condensing means, and a position detecting optical means comprising an optical beam splitter, the optical beam splitter being a reflex diffractive optical component for diffracting the light beam introduced by the light condensing means into the light path and propagated therethrough so as to direct the light beam sideways of the direction of propagation, the light condensing means being a transmission type, and being disposed on the top surface of the substrate so as to radiate the light beam from the light source obliquely to the substrate, the beam splitter comprising a pair of curved gratings arranged laterally with respect to the light beam, and are symmetrical to each other with respect to the light propagating direction.
Dependencies are inferred from the claim text.