Patent
Optical pickup having two objective lenses
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TLDR
In this paper, an optical pickup is used to irradiate a first recording medium and a second recording medium with light, where at least one of the substrate thickness and the refractive index of the first record medium being different from that of the second record medium.Abstract:
An optical pickup (1) for irradiating a first recording medium and a second recording medium with light, at least one of the substrate thickness and the refractive index of the first recording medium being different from that of the second recording medium, where the optical pickup includes: a light source (23) for emitting the light; a polarized beam splitter (22) for receiving the light and for transmitting at least a portion of the light while reflecting the remaining portion of the light depending on the polarization direction of the light; a first objective (5) lens for focusing the portion of the light reflected by the polarized beam splitter (22) onto the first recording medium; and a second objective lens (4) for focusing the portion of the light transmitted through the polarized beam splitter (22) onto the second recording medium.read more
Citations
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Patent
Optical pickup device and optical disc device
TL;DR: In this article, an optical pickup device consisting of a plurality of laser light sources emitting laser beams of different oscillation wavelengths, and objective lenses on which the laser beams in the form of diverging beams emitted by the plurality of light sources are incident, and which directly focus the laser beam onto a recording surface of an optical disc is described.
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References
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Patent
Optical head device
TL;DR: In this article, an optical head device consisting of a light source, an objective lens, a beam splitter, and a photo detector is used to detect the returned light deflected by the beam-splitter.
Patent
Compound objective lens having two focal points
TL;DR: In this paper, a compound objective lens is composed of a hologram lens for transmitting a part of incident light without any diffraction to form a beam of transmitted light and diffracting a remaining part of the incident light to form the beam of first-order diffracted light.
Patent
Optical recording medium and optical recording/reproducing apparatus
Kenichi Nishiuchi,Nobuo Akahira +1 more
TL;DR: In this paper, a data playback apparatus for optical recording medium with a data layer disposed on a substrate having a specific thickness is provided with an optical length corrector interposed between the recording medium and an objective lens for converging a light beam.
Patent
Optical disc apparatus
Naoyasu Miyagawa,Yasuhiro Gotoh +1 more
TL;DR: In this paper, an optical disc apparatus for recording, reproducing, or erasing an information signal by converging a light flux onto a recording layer through a transparent substrate comprises: an optical head (30) having a plurality of objective lenses (36, 46) whose aberrations have respectively been corrected for different substrates of different thicknesses; and means for discriminating the thickness of the disc substrate.
Patent
Optical pickup for an optical disc player
Taichi c,o Pioneer Electr. Corp. Tokorozawa Akiba,Masayuki C,O Pioneer Electr. Corp. Koyama,Shigeyuki C,O Pioneer Electr. Corp. Sasanuma,Osamu c,o Pioneer Electr. Corp. Tokorozawa Ueda +7 more
TL;DR: In this article, a holder (60) is suspended on a carriage (21), and a magnetic circuit (32, 45, 46, 47) is disposed adjacent to the holder.