Optical information device, tilt detection method, computer, player, and recorder
A technology of optical information and light beams, which is used in optical recording/reproducing, beam guiding devices, information storage, etc., can solve problems such as errors, detection signal polarity errors, etc., achieve reliable correction, low error rate, and reduce coma. Aberration effect
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no. 1 Embodiment
[0041] figure 1is a schematic diagram showing the configuration of an optical disc information device according to the first embodiment of the present invention.
[0042] figure 1 The optical disc information device shown includes a blue semiconductor laser 1, an objective lens 3, a laser mirror 4, a split element 6, a photodetector 7, an addition circuit 8, a reproduced signal processing unit 9, a differential circuit 10, a control signal processing unit 11, Objective lens actuator 14, the first high-frequency range extraction circuit 21, the first low-frequency range extraction circuit 22, the second high-frequency range extraction circuit 23, the second low-frequency range extraction circuit 24, the first normalized differential circuit 25, the second Standardized differential circuit 26 , amplifier 27 and differential circuit 28 .
[0043] exist figure 1 In this example, light with a wavelength of 400 nm to 4151 nm is emitted from a blue semiconductor laser 1 as a la...
no. 2 Embodiment
[0097] In the second embodiment, an example of combining tilt correction and crosstalk cancellation will be described. In addition, the same reference numerals are assigned to the same constituent elements as those of the first embodiment, and detailed description thereof will be omitted.
[0098] Figure 14 is a schematic diagram showing the configuration of an optical disc information device according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that a three-divided division element 60 is used instead of a two-divided division element 6 .
[0099] Figure 14 The optical disc information device shown includes a blue semiconductor laser 1, an objective lens 3, a laser mirror 4, a split element 60, a photodetector 70, an addition circuit 8, a reproduced signal processing unit 9, a differential circuit 10, a control signal processing unit 11, Objective lens actuator 14, the first high-frequency range...
no. 3 Embodiment
[0119] A computer according to a third embodiment of the present invention includes the optical disc information device according to the first or second embodiment.
[0120] Figure 19 It is a perspective view showing a schematic configuration of a computer according to a third embodiment of the present invention.
[0121] Figure 19 The shown computer 609 includes the optical disc information device 607 according to the first embodiment or the second embodiment, an input device 616 such as a keyboard 611 or a mouse 612 for inputting information, based on the information input from the input device 616 and the information from the optical disc. An arithmetic unit 608 such as a central processing unit (CPU) that performs calculations on information read by the unit 607 , and an output unit 610 such as a picture tube or a liquid crystal display that displays information such as the results of calculations by the arithmetic unit 608 .
[0122] The computer 609 according to the ...
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