KR19990060205A - High precision signal recording / reproducing device with six degrees of freedom - Google Patents

Abstract

The present invention provides access to data of an optical storage medium in pit units in which a laser beam irradiated with an arbitrary frequency wavelength is irradiated to a recording medium through a first path changing means, and then the reflected laser beam is input to access data. In particular, the present invention relates to a laser generating means for receiving data converted into a digital signal by a PCM method and generating image data or sound data into a laser beam of a specific frequency band, and a laser beam irradiated from the laser generating means. Irradiation of the unnecessary wave is removed when the optical signal reflected from the high-precision signal recording / reproducing apparatus having the six degrees of freedom of the linear polarizing means and the linear polarizing means is irradiated to the recording medium through the second path changing means. Six stages of freedom characterized in that it comprises a modulator for changing the wavelength of the laser beam to be Also it relates to a signal having a fixed recording / reproducing apparatus.

Description

High precision signal recording / reproducing device with six degrees of freedom

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus. In particular, a photodiode is provided on each optical path of an optical recording apparatus having a conventional three-stage freedom detection function, and a laser beam irradiated passes through a polarizing plate bonded to an optical crystal prism. By condensing the laser beam focused at one point by the recording lens onto the photoresist layer of the rotating recording plate, it is possible to maintain miniaturization and high accuracy, and to record / reproduce high-precision signals with six degrees of freedom for diary / writing. It relates to a device (Read and write device of 6 step for high-degree).

In general, due to the development of electronic technology and the development of optical technology, it has been developed from a bit storage medium according to digital signal processing, such as a hard disk, to a pit optical storage medium. The development of such a technology is to store more data in a small volume of storage media, and is also due to an increased interest in utilizing image data as well as text data such as photographs or images.

In view of the above-described concerns, a typical optical storage medium in the pit unit is a reproducing apparatus according to modulation of an optical signal, such as a CD or an LD, and the like, as shown in FIG. When a voltage above a threshold is applied, a laser beam of a specific wavelength is generated and irradiated by the laser generator LG.

In this case, the laser beam irradiated from the laser generator LG is collected by the condenser lens L1, and the laser beam condensed by the condenser lens L1 is applied to the reflector M1 for changing the irradiation path. Is irradiated to a specific surface of an optical storage medium (for example, CD) SM which is reflected to form an uneven surface of a predetermined form.

In this case, the degree of reflection of the laser beam irradiated on the optical storage medium SM varies depending on the degree of irregularities of the photoresist applied to the surface of the optical storage medium SM. The photodiode PD is applied to the diode PD. The photodiode PD outputs an electric signal corresponding to the intensity of the laser beam. Then, the electrical signal output from the photodiode PD is recognized by a signal recognition means (not shown).

The optical storage medium used in the manner shown in FIG. 1 is manufactured by a specific manufacturer, and when manufactured, a recording apparatus as shown in FIG. 2 is used.

The recording device shown in FIG. 2 is often referred to as a three-stage recording device. Referring to the operation, the recording device converts image data or sound data into a digital signal by a PCM method, and converts it into an optical signal through a photodiode. Let's do it.

Subsequently, the laser beam of a predetermined frequency band is changed through a laser generator (LGa) for generating and scanning a laser beam of a specific frequency band and a modulator (FM) for changing the wavelength of the laser beam, thereby storing the storage medium (SM). ), And therefore, a pit pattern of a specific pattern is exposed to the photoresist applied to the storage medium SM. Therefore, information is recorded according to a pit pattern formed in the storage medium SM.

Therefore, the pit information recorded by the recording apparatus as shown in FIG. 2 is accessed by the reproducing apparatus shown in FIG. 1, which is simply recorded. There is a limitation that only the function of accessing and reproducing information can be performed.

In addition, since the recording apparatus shown in FIG. 2 described above has a three-degree-of-freedom detection method, an unnecessary wave vibration is generated, resulting in a problem of inaccurate accuracy and slowness in converging a focal point.

An object of the present invention for solving the above problems is to include a photodiode on each optical path of an optical recording device having a three-stage degree of freedom detection function and to cause the irradiated laser beam to pass through a polarizing plate bonded to an optical crystal prism. By condensing the laser beam focused at one point by the recording lens onto the photoresist layer of the rotating recording plate, it is possible to maintain miniaturization and high accuracy, and has a high-precision signal recording / reproducing device having six degrees of freedom for diary / writing. To provide.

1 is a configuration example for explaining the operation of a general read-only optical device

2 is an exemplary configuration diagram of a conventional three-stage recording device.

3 is an exemplary configuration diagram of a high-precision signal recording / reproducing apparatus having six degrees of freedom according to the present invention.

A feature of the present invention for achieving the above object is a pit for irradiating a laser beam irradiated with an arbitrary frequency wavelength to the recording medium through the first path changing means and receiving the reflected laser beam to access data. A data access device of a unit optical storage medium, comprising: laser generating means for receiving image data, sound data, and the like converted into a digital signal by a PCM method and generating a laser beam of a specific frequency band; Linear polarization means for removing the unnecessary wave vibration in the laser beam irradiated from the optical signal and the optical signal reflected from the high-precision signal recording / reproducing apparatus having six degrees of freedom of the linear polarization means through the second path changing means Includes a modulator that changes the wavelength of the irradiated laser beam when irradiated to .

An additional feature of the present invention for achieving the above object further comprises a second linearly polarized means for inputting the laser beam irradiated to the first path changing means to remove the light of unnecessary wavelengths and to transmit it to the path changing means. There is.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exemplary configuration diagram of a high-precision signal recording / reproducing apparatus having six degrees of freedom according to the present invention.

Since light is a vibration wave like radio waves, laser light can fix the direction of propagation of oscillation at a single frequency. After applying photoresist to a glass disc, it modulates the irradiated laser signal and records information. The recording light source uses a blue violet laser beam of wavelength 0.458 mu m and 0,442 mu m.

This is because the wavelength of the portion of the photoresist where the recording sensitivity is high is short purple. The beam on the output side blinks by the pulse signal passing through the optical modulators. It changes the intensity of light in response to an electrical signal.

Therefore, in operation, the image data and the sound data are converted into digital signals by the PCM method, and the first laser generator 10B converts them into laser beams according to the optical signals.

At this time, the wave used for recording is linearly polarized light, and emits a laser beam which vibrates in a constant direction, and removes unnecessary vibrations from the first linear polarizer 10B. At this time, the optical signal reflected from the first linear polarizer 10B is converted to an arbitrary wavelength through the modulator M for changing the wavelength of the laser beam after the path is switched through the mirror via the second photodetector PD2. The laser beam of the frequency band having a change is irradiated to the storage medium (SM).

As a result, a pit pattern of a specific pattern is exposed to the photoresist applied to the storage medium SM. Therefore, information is recorded according to a pit pattern formed in the storage medium SM.

On the other hand, in order to access the data recorded through the above-described operation, applying a voltage higher than or equal to the threshold value to the second laser generator 100A generates a laser beam having a specific wavelength in the second laser generator 100A. Is investigated.

At this time, the unnecessary wave vibration of the laser beam irradiated from the second laser generator 100A is removed by the first linear polarizer 10B and then reflected by a reflector Ma for changing the irradiation path. The specific surface of the optical storage medium (for example, CD) SM which forms the uneven surface of the form is irradiated.

In this case, the degree of reflection of the laser beam irradiated onto the optical storage medium SM is changed according to the degree of irregularities of the photoresist applied to the surface of the optical storage medium SM. ) Is detected by the first photodetector C, and then the data accessed through the connector C is transferred to the signal processing apparatus.

The combined read / write device according to the present invention which operates as described above uses an optical detector and has an effect of making the shape smaller even with a writing device than the conventional reading device limited to three degrees of freedom detection.

Claims (2)

In the data access device of the optical storage medium of the pit unit for irradiating a laser beam irradiated with an arbitrary frequency wavelength to the recording medium through the first path changing means and receiving the reflected laser beam to access data , Laser generating means for receiving image data or sound data and the like converted into a digital signal by a PCM method and generating the laser beam of a specific frequency band; Linearly polarized means for removing unnecessary vibrations from the laser beam irradiated from the laser generating means; And a modulator for changing the wavelength of the irradiated laser beam when the optical signal reflected by the high-precision signal recording / reproducing apparatus having the six degrees of freedom of the linear polarizing means is irradiated to the recording medium through the second path changing means. A high-precision signal recording / reproducing apparatus having six degrees of freedom. The method of claim 1, And a second linearly polarized means for inputting the laser beam irradiated to the first path changing means to remove light of unnecessary wavelengths and then transmitting the light to the path changing means. Recording / playback device.