摘要:
The present invention relates to a device for reading from and/or writing to optical recording media (6), which has a light source (1) for producing a scanning beam (2), a photodetector (7) for detecting the scanning beam (2) reflected by the recording medium (6) and a semi-transparent mirror (3) arranged in the beam path for directing the scanning beam (2) onto the recording medium (6) and the reflected scanning beam (2) onto the photodetector (7). The object of the invention is to improve a device of this type, in particular also with regard to reducing the production costs. This object is achieved by the semi-transparent mirror (3) being a plane-parallel plate with a layered structure, a partially reflective layer (10) being arranged between two small carrier plates (11, 12).
摘要:
The present invention relates to a device for reading from and/or writing to optical recording media having a scanning unit (1), which is equipped with at least two detector units (10, 20) each having a plurality of detector elements (11-18, 21-28), and also an evaluation unit (2), each of the detector elements (11-18, 21-28) being connected to the evaluation unit (2) by means of a line (31-38). The object of the present invention is to simplify the structure of a device of this type. This object is achieved by virtue of the fact that detector elements (11, 21; 12, 22, ..., 18, 28) of different detector units (10, 20) are each connected to the evaluation unit (2) via a single line (31; 32; ...; 38). The device according to the invention is advantageously a device which can read from and/or write to not only optical recording media which correspond to a CD standard but also those which correspond to a DVD standard.
摘要:
The invention relates to a magneto-optic recording or reproducing unit having an erasing facility for information or data recorded on a magneto-optic recording medium. According to the invention, the erasing facility is formed by an erasing magnet (LM) having a field strength sufficient to initialize the magneto-optic recording medium without the assistance of a laser and/or an optical scanning unit. The field of application of the invention relates to magneto-optic recording or reproducing units.
摘要:
The invention relates to a magneto-optic recording or reproducing unit having an erasing facility for information or data recorded on a magneto-optic recording medium. According to the invention, the erasing facility is formed by an erasing magnet (LM) having a field strength sufficient to initialize the magneto-optic recording medium without the assistance of a laser and/or an optical scanning unit. The field of application of the invention relates to magneto-optic recording or reproducing units.
摘要:
Die vorliegende Erfindung betrifft ein Gerät zum Beschreiben und/oder Lesen optischer Aufzeichnungsträger (AT) unterschiedlichen Aufbaus, beispielsweise ein Gerät, das sowohl zum Beschreiben/Lesen von Digitalen Videodisks DVD als auch von herkömmlichen CDs geeignet ist. Es ist vorgesehen, während des Heranfahrens der Objektivlinse (OL) an den Aufzeichnungsträger (AT), das von diesem reflektierte Licht zu detektieren, auszuwerten und daraus die Art des optischen Aufzeichnungsträgers zu bestimmen. Die Erfindung ist auf dem Gebiet der Geräte zum Beschreiben und/oder Lesen optischer Aufzeichnungsträger (AT) unterschiedlichen Aufbaus anwendbar, beispielsweise bei Geräten, die sowohl zum Beschreiben/Lesen von Digitalen Videodisks DVD als auch von herkömmlichen CDs geeignet sind.
摘要:
The present invention relates to a device for reading from and/or writing to optical recording media (6), which has a light source (1) for producing a scanning beam (2), a photodetector (7) for detecting the scanning beam (2) reflected by the recording medium (6) and a semi-transparent mirror (3) arranged in the beam path for directing the scanning beam (2) onto the recording medium (6) and the reflected scanning beam (2) onto the photodetector (7). The object of the invention is to improve a device of this type, in particular also with regard to reducing the production costs. This object is achieved by the semi-transparent mirror (3) being a plane-parallel plate with a layered structure, a partially reflective layer (10) being arranged between two small carrier plates (11, 12).
摘要:
Die vorliegende Erfindung betrifft ein Gerät zum Beschreiben und/oder Lesen optischer Aufzeichnungsträger (AT) unterschiedlichen Aufbaus, beispielsweise ein Gerät, das sowohl zum Beschreiben/Lesen von Digitalen Videodisks DVD als auch von herkömmlichen CDs geeignet ist. Es ist vorgesehen, während des Heranfahrens der Objektivlinse (OL) an den Aufzeichnungsträger (AT), das von diesem reflektierte Licht zu detektieren, auszuwerten und daraus die Art des optischen Aufzeichnungsträgers zu bestimmen. Die Erfindung ist auf dem Gebiet der Geräte zum Beschreiben und/oder Lesen optischer Aufzeichnungsträger (AT) unterschiedlichen Aufbaus anwendbar, beispielsweise bei Geräten, die sowohl zum Beschreiben/Lesen von Digitalen Videodisks DVD als auch von herkömmlichen CDs geeignet sind.
摘要:
For the servo control loop of a reproduction or recording device for optical recording media, it is necessary to control the gain of the input signal amplifier, since otherwise an error signal is not amplified in a correspondingly uniform manner and, on account of changes in the reflectivity of an optical disk or the like, the scanning unit is not controlled correctly. In order to control the gain of the input signal amplifier, the digitized summation signal of the optical information signal is used, the MSB switching a smallest feedback resistor in and out and the LSB switching a largest feedback resistor in and out. In this case, each bit of the digitized summation signal is assigned a feedback resistor, and the resistors preferably form an ascending sequence from the MSB to the LSB. The resistances of successive resistors preferably differ from one another by a factor of 2. This achieves a reciprocal response of the gain with regard to the input signal.