Gradiometer in optical writing and playing apparatus and method thereof
A technology of a playback device and a light-gathering device is applied in the field of optical recording and playback systems, and can solve problems such as cost reduction, sensor space occupation, and unfavorable system miniaturization, and achieve the effect of reducing price and realizing miniaturization.
Inactive Publication Date: 2008-07-23
LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI
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[0020] However, in an ordinary optical recording and playback device that can perform the above operations, in order to detect the tilt, the sensor needs to occupy an additional part of the space, which is not conducive to the miniaturization of the system and the reduction of the cost
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[0032] Hereinafter, typical operations in the present invention will be described in detail with reference to the accompanying drawings.
[0033] image 3 It is a cross-sectional view of an optical disc storage and reading device capable of realizing the object of the present invention-detecting inclination.
[0034] As shown in the figure, the light source LD301, the adjustment lens 302 that converts the light emitted from the above-mentioned light source into a parallel beam, and the light emitted by the above-mentioned adjustment lens passes through the electron beam splitter (not shown) and is reflected by the mirror 303, and then converges to The objective lens 304 then converges to an arbitrary point on the optical disc 305 . In addition, lenses 306 and 307 in even-numbered units are formed outside the effective distance of the above-mentioned objective lens, that is, on the left and right sides, and the light reflected from the above-mentioned optical disc passes throu...
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The device and method uses to detect incline of CD (Compact Disc). Set one lens at some part of OL (OL-Object Lense) to detect the incline of CD and the lens detects reflected beam from recording medium. Use input beam to detect the incline of CD by the said lens. The optics recording and detecting incline device of play device can be made up by this method. It relates to lamp-house, concentrating device, optic recording medium using concentrating beam and reflected beam coming from the said concentrating device to record and play and lens on certain place of the said concentrating device for passing through the reflected beam. It adopts detect beam instrument that is corresponding to the number of lens in order to detect the passing beam of lens. It can control incline to realize miniaturization for optics recording device and reduce the cost.
Description
【Technical field】 [0001] The invention relates to an optical recording and playing system, and is especially suitable for detecting the inclination of an optical disc as a recording medium. The working principle of the invention is as follows: in order to detect the inclination of the recording medium as an optical disc, a lens is formed on a certain part of the objective lens (OL-Object Lense), and the lens can detect light reflected from the above-mentioned recording medium; The light can detect disc tilt. 【Background technique】 [0002] Today, all kinds of data are characterized by electronization and large capacity, and the storage medium has changed from magnetic tape to optical disc. In addition, by increasing the recording density of data stored in the optical disc, the storage capacity of the optical disc is greatly increased. [0003] Therefore, increasing the recording density in a high-density optical disc can shorten the channel pitch, that is, the track pitch....
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IPC IPC(8): G11B7/095G11B7/0045G11B7/13G11B7/131
Inventor 金哲敏
Owner LEJIN GUANGDIAN ELECTRONIC CO LTD SHANGHAI