Optical pick device
An optical and compensating device technology, applied in the directions of optics, beam guiding devices, optical components, etc., can solve the problems of adverse effects of optical disc recording and playback, inability to compensate for spherical aberration, inability to guarantee frequency bands, etc.
Inactive Publication Date: 2003-10-01
JVC KENWOOD CORP
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Problems solved by technology
In other words, in the objective lens, aberration with coma aberration as the main component occurs, which has a significant adverse effect on the recording and playback of the optical disc.
[0023] As a countermeasure against the increase in aberration when the optical axis of the objective lens and the chromatic aberration compensating element deviates, based on the structure of the above-mentioned Japanese Patent Laid-Open No. 6-82725, it is possible to perform only axial chromatic aberration compensation instead of spherical aberration compensation , but the problem in this case is that the spherical aberration caused by the wavelength error cannot be compensated
In addition, in the structure for simultaneously compensating spherical aberration and focus error in the above-mentioned JP-A-6-82725, when the objective lens and the chromatic aberration compensating element are driven together by the actuator, there is an increase in the weight of the movable part, The problem that the required frequency band cannot be guaranteed
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[0070] Embodiments of the optical pickup device of the present invention will be described in detail below with reference to the accompanying drawings.
[0071] figure 1 It is a figure which shows the schematic structure of an optical pickup device.
[0072] Optical pick-up device 10 is to irradiate light along the optical disk track of rotation, carries out the recording of information signal or playback, has: objective lens 19, triplet lens (triplet) 18 and beam expander 17, wherein: objective lens 19 is controlled Move on the radial direction of aforementioned optical disc, so that the light of convergence is irradiated along the track of optical disc; Triple lens 18 becomes the fixed chromatic aberration compensation device that the chromatic aberration of object lens 19 is compensated; The fixed spherical aberration compensating device that compensates the spherical aberration of the objective lens 19, and the triplet lens 18 that becomes the chromatic aberration compens...
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Abstract
The present invention is an optical pick-up device for recording or reproducing information signals by irradiating light along the track of a rotating optical disc. It is provided with: an objective lens 25, a triplet lens 240 and an expander, wherein: the objective lens 25 is controlled at the aforementioned The radial movement of the optical disc, so that the converged light is irradiated along the track of the optical disc; the triplet lens 240 is fixed to compensate the chromatic aberration of the objective lens 25; the expander is fixed to perform the spherical aberration compensation of the objective lens 25, The combined lens 240 compensates for an error component in the focus direction due to chromatic aberration.
Description
technical field [0001] The present invention relates to an optical pickup device for recording or reproducing information signals by irradiating light onto an optical disc. Background technique [0002] Existing optical recording media, that is, optical discs, are used to store information signals (data) such as animation, sound, and computer data. Since this kind of optical disk has good mass production and low cost, it is widely used. Higher density and larger capacity of recorded information signals are strongly required for such optical discs, and the demand for this has become stronger in recent years. [0003] In order to increase the recording density of the recorded information signal on the optical disc, there are two methods: shortening the wavelength of the light beam used to read the information signal and using a lens with a high numerical aperture (NA) as the objective lens for converging the light beam on the optical disc. It is vaild. [0004] Therefore, i...
Claims
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IPC IPC(8): G02B13/00G02B13/18G11B7/125G11B7/135G11B7/1353G11B7/1378G11B7/1392
CPCG11B7/1353G11B7/1378G11B7/13922G11B7/13925
Inventor 糸长诚
Owner JVC KENWOOD CORP