KR100759958B1 - Read/write device for optical memory and method therefore - Google Patents

Abstract

Described herein are miniaturizable devices and methods for reading / writing information to optical storage medium (11). The apparatus includes one or more light sources 12 associated with the access unit 10, wherein the access unit 10 is a light beam in which the light beams 21, 22 are transmitted transversely and reflected toward the optical storage medium. Are made controllable to the position analyzed by the detector elements 18, 26, the detector elements 18, 26 also being moved or intact so that the light beams are in focus and on the track. The access unit is notified. The device according to the invention is feasible to be small in size and low in weight due to the reduced number of parts and the geometry of the thin access unit. The communication device 80 according to the invention can be implemented to meet the most important requirements for the micro orientation of the communication devices.

Description

Read / write device for optical memory and method therefore}

The present invention relates to the field of optical storage systems, and more particularly to the field of reading information from and recording information on the optical storage medium.

An optical storage system consists of an optical disk drive system and an optical storage medium such as an optical disk. The optical disk drive has an optical beam officer, an optical beam distribution system, and an optical beam detection system that reads information from and writes information on the optical disk. The read and write operation function of the optical disc drives is achieved by using an optical pick-up unit (OPU) which is arranged in such a way that the optical beam is positioned at a vertical angle with respect to the optical disc for radiation and detection purposes in a conventional manner. do. This type of read and write operation is referred to herein as a vertical operation.

Prior art optical pickup units typically have a laser light emitting diode, photodetector, optical lens and device, such as a voice coil for positioning the lens for proper focusing and tracking during read and write operations. . The OPU moves radially to access data tracks on the optical disc by using a sliding rail system connected to the motor, or a fixed OPU connects to a rotatably arranged geared light pipe connected to the motor. It is. When the optical disk rotates about its center via a motor and the OPU or optical path head connected to the OPU moves radially across the optical disk, the data tracks of the optical disk are accessed.

Prior art optical pickup units typically use a single optical beam path towards the optical storage medium. Optical light paths are used as channels for directing the light beam from the light source to the lens system adjacent to the track of the optical disk and for reflecting the light beam reflected back from the track of the optical disk to the detection system adjacent to the light source. In a typical embodiment, a polarizing beam splitter (or a similar system using semi-reflective mirrors, for example) is used to direct light beams to the lens system.

Since conventional CD and DVD techniques are considered to be known and widely covered by the patents and publications, they will not be discussed in detail herein. Some examples of non-standard solutions to prior art optical pickup units are mentioned in the following documents: WO 99/00793, US Pat. No. 4,581,529, US Pat. No. 5,481,515. , US Pat. No. 5,835,458 and US Pat. No. 6,256,283. Recently, non-standard fixed arm systems of the prior art are mentioned in documents such as WO 02/059888 A2 and WO 02/059887 A2.

There are some limitations associated with prior art OPU systems. The weight of the movable OPU or rotatably arranged geared optical light path head is heavy. In particular, the laser source is a heavier, larger sized part and the center of gravity of the laser source is on the movable OPU or the movable light passage head in prior art systems. Due to the weight of the movable OPU, problems with the sensitivity to track angle error and the pitching motion of the optical disc in defocussing are brought about at the same time. Several optical storage systems of the prior art require astigmatism in the system for error analysis, which also allows more component count to be used to form astigmatism elements. All further parts add weight and complexity to the system, which increases the power consumption of the OPU system and extends access times. The access times are quite long in the case of movable sledge OPU systems.

One object of the present invention is to solve the problems associated with the prior art and consequently to provide an apparatus and method for reading data from and writing data to the optical storage medium, thereby providing a compact and low weight optical storage system. To allow. It is another object of the present invention to provide an apparatus and method for reading data from and writing data to an optical storage medium so that the optical storage system is in focus and on track to ensure reliable operation.

It is an object and method of the present invention that a single light beam or a plurality of light beams are arranged at an angle to the optical storage medium to emit (emit) the light beams and to detect (receive) reflected light beams. By providing it. The beam is in the transverse direction, in which case its center beam is essentially out of the vertical direction with the optical storage medium.

 According to the present invention there is provided an apparatus comprising at least one access unit and an optical storage medium drive for reading data from and writing data to an optical storage medium comprising a plurality of data tracks, the at least one first At least one light source configured to produce a light beam and at least one second light beam; Transmission means adapted to transmit and guide the first light beam and the second light beam toward data tracks of the optical storage medium; And detection means adapted to detect light beams reflected at the surface of the optical storage medium, the device being adapted to pivot the access unit in three dimensions on one end, the transmission means and The detecting means is adapted to move in accordance with the movement of the access unit, and the transmitting means is configured to guide the first light beam and the second light beam in a horizontal direction toward data tracks of the optical storage medium, and the detection Means is adapted to receive reflected beams of the first or second light beam from data tracks of the optical storage medium.

According to the present invention, there is provided a method of reading data from an optical storage medium and writing data to the optical storage medium in an apparatus including at least one access unit, wherein the at least one optical storage medium including a plurality of data tracks is configured to store data. Storing; Controlling an operation of the device by an optical storage medium driver; Generating at least one light source at least one first light beam and at least one second light beam; The first and second light beams being transmitted and guided toward data tracks of the optical storage medium; And detecting light beams reflected from the surface of the optical storage medium, wherein the first and second light beams are transversely directed toward data tracks of the optical storage medium. Guided to; Receiving reflected beams of a first or second light beam from data tracks of the optical storage medium; And moving in three dimensions relative to the pivot point on one end such that the access unit focuses and tracks the first and second light beams.

In one preferred embodiment of the invention, the reflected light ratio is oriented in the transverse direction towards the data tracks of the optical storage medium and the recording light beam is directed in the vertical direction to the data tracks of the optical storage medium and is reflected by the detector. By following any intensity distribution change it is considered that the access unit, preferably the arm unit, is a controllable communication device and method to a position where the light beam is kept in focus and on the track. According to one preferred embodiment, the light source emitting the light beams is located at or near the pivot point on one end of the access unit.

As used herein, 'in three dimensions' means that the access unit moves about the vertical (x) and horizontal (y) axes and rotates about the length (z) axis at the pivot point. As used herein, the term 'focusing' means the same as keeping in focus and the term 'tracking' means the same as keeping on a track.

The present invention provides a novel method of implementing an optical read / write system that enables a reduction in the number of parts through a new optical component configuration that simplifies the optical system. The mobile access unit according to the invention is possible to manufacture using thinner geometries, whereby the mobile access unit meets the requirements of small size and low weight, which are the most important requirements in the micro-direction of optical storage devices.

In addition, the present invention provides a novel and accurate way for the optical read / write system to stay in focus and on the track. The combination of the use of lateral light beams directed towards the optical storage medium and reflected from the optical storage medium and the use of the movable access unit provide a simple focusing and tracking method. Focus error and track error signals can be identified by following a change in intensity distribution of the reflected light beam. Reliable operation is achieved by simultaneous horizontal beam beam focusing and tracking during read and / or write operations.

In addition, the smaller size and less weight of the mobile access unit according to the invention also allows for a faster random access time of the optical storage device. The movable weight of the access unit is still lighter enough to fix all possible parts (including the light source) on the pivot point of the access unit. This minimizes the amount of angular momentum required to move the arm. By reducing the number of parts, the apparatus and method according to the invention also consequently reduce the power consumption. The number of parts of the optical components can be significantly minimized in the simplest embodiment of the invention. Because of the reduced part count, space savings are also achieved and production costs are lower.

In addition, the apparatus and method according to the present invention can use all existing optical disk media without placing any additional constraints on the optical storage media.

Some embodiments of the invention are mentioned in the dependent claims. The main practical features and simulation results for the present invention are also mentioned in the annexed report, which supplements the patent application but does not replace it. The report includes certain detailed calculations excluded from this application because they are considered as specific of one particular embodiment rather than in connection with the basic invention. However, they are relevant for the establishment of the technical feasibility of the present invention.

The novel features which are considered to be features of the invention are described in particular in the appended claims. However, the present invention itself, in both the configuration of the present invention and the method of operation of the present invention, together with additional objects and advantages of the present invention, is to be interpreted in connection with the accompanying drawings and the appended reports as follows. It will be better understood from the description of the embodiments.

1A is a side view of an apparatus according to one embodiment of the present invention.

1B is a side view of an apparatus according to another embodiment of the present invention.

Figure 2a shows one embodiment of the optical configuration of the device according to the invention.

2b shows another embodiment of the optical configuration of an apparatus according to the invention.

2c shows another embodiment of the optical configuration of the device according to the invention.

3a shows a simple embodiment of the optical configuration of a device according to the invention.

3b shows another embodiment of an optical configuration of an apparatus according to the invention.

4a shows one embodiment of an apparatus according to the invention.

4b shows another embodiment of the device according to the invention.

4c shows another embodiment of the device according to the invention.

5 shows one embodiment of the use of two separate light sources according to the invention.

Fig. 6a shows the basic concept for the detection of the focus adjustment signal of the device according to the invention.

6b shows a basic concept of detection of a focus adjustment signal of a device according to the invention.

6c shows a basic concept of detection of a focus adjustment signal of a device according to the invention.

6d shows a basic concept of detection of a focus adjustment signal of a device according to the invention.

Fig. 6E illustrates the basic concept of detection of a focus adjustment signal of a device according to the invention.

Figure 7a is a diagram showing the basic concept of the tracking signal detection of the apparatus according to the present invention.

7B is a side view illustrating the basic concept of tracking signal detection of an apparatus according to the present invention.

7C is a side view illustrating the basic concept of tracking signal detection of an apparatus according to the present invention.

Figure 7d is a simplified illustration of the basic concept of tracking signal identification of an apparatus according to the present invention.

Figure 7e is a diagram briefly showing the basic concept of tracking signal identification of the apparatus according to the present invention.

Figure 7f is a diagram briefly showing the basic concept of tracking signal identification of the apparatus according to the present invention.

Fig. 7g is a plan view showing the basic concept of tracking signal identification of the apparatus according to the present invention.

7h illustrates the basic concept of tracking signal identification of an apparatus according to the present invention.

Figure 7i illustrates the basic concept of tracking signal identification of an apparatus according to the present invention.

7j illustrates the basic concept of tracking signal identification of an apparatus according to the present invention.

7K illustrates the basic concept of tracking signal identification of an apparatus according to the present invention.

8 is a block diagram showing a communication device according to the present invention.

9 is a flowchart showing a method according to the invention.

10A is a flowchart showing an algorithm for a method according to an embodiment of the present invention.

10B is a flowchart showing an algorithm for a method according to another embodiment of the present invention.

1A shows the main configuration of an apparatus according to the invention for reading data from and writing data to an optical storage medium. The optical storage medium 11 is readable and / or writable in any CD form, such as a CD-R, CD-ROM, CD-RW, DVD, other existing optical disc media or future implementations of this type. It may be an optical disk. The optical storage medium 11 comprises data tracks, and adjacent data tracks are decoupling each other by a narrow area. The data tracks may be pre-groove or stamped and made of a suitable material to form optically degradable structures on the optical storage medium. Bit patterns that produce a suitable change in light intensity on the data tracks, such as the pitted structure of the medium, form the basis for storage and change of information. The apparatus also includes an optical storage medium drive (not shown), which may be in any commercial form available. Movement of the optical storage medium is effected by the optical storage medium drive.

The access unit 10 pivots in three dimensions on one end 101 of the access unit 10, referred to herein as the pivot point 101. By 'three-dimensional' means that the access unit moves about the vertical (x), horizontal (y) and length (z) axes at the pivot point. Thus, the access unit can be controlled not only up-down and laterally with respect to the pivot point of the access unit, but also in the direction of rotation relative to the pivot axis with respect to the pivot point of the access unit. By controlling the access unit with respect to the up-and-down adjustment (z-axis) direction, a push-pull movement of the access unit is generated, and this push-pull movement is z perpendicular to the surface of the optical storage medium. Keep the axis. The access unit 10 may preferably be an arm unit, which may also be referred to as a pivoted arm or a movable arm. The movement of the arm in the x, y, z directions can be controlled by acoustic loops similar to those controlling the movement of small lenses, for example in conventional CD drives. The access unit can be realized in a number of variations, the key being that the orientation of the beam must be controllable in the x, y and z directions.

Other main units of the device illustrated in FIG. 1A include a light source 12 emitting a light beam 13, a mirror, prism or other suitable optical component for bending the light beam to the optical storage medium 11. Same optical component 15, lenses for bending and focusing the light beam or other optical component 16, such as a diffractive optical element (DOE), for collimating and / or focusing the reflected light beam Optical component 17, such as a lens or diffractive optical element (DOE), and a detector element 18 for receiving and detecting reflected light beams. The detector element 18 has at least two, preferably four detection surfaces for analyzing the focus and tracking signals. Collimating optical element 14 may be used to collimate the light beam. Transmission of the light beam 13 from the light source 12 to the optical components 15, 16 can be performed in free space, but not shown (such as waveguides, light paths, etc.) for the transmission of the light beam. It is also possible to use optical components. All units 12-18 of the above-mentioned device may be made to move according to the movement of the access unit 10. In other words, all units 12-18 of such an apparatus are to be spread over the access unit using suitable fastening means, for example the support body 19 in FIG. 1A. The units 12, 18 are also electrically connected to the main control unit (not shown) and the access unit 10 of the apparatus. The light source 12 is preferably located at or near the pivot point 101 in order to minimize the angular momentum required to move the arm.

According to the above-mentioned configuration of the device according to the invention, the light beam emitted from the light source is directed at a transverseal angle towards the data tracks of the optical storage medium. Reflected light beams reflected from the surface of the optical storage medium are received at transverse angles by the detector element 18 and the associated optical component 17. Of course, due to the different light paths of the light beams, separation of the reflected light and the illumination light comprising the data signal is achieved.

According to one embodiment of the device, the light source 12 is pivot point 101, in other words the pivot point 101 in the access unit 10, preferably the access being different from the head of the arm unit. It may be located at the end of the unit 10. In this embodiment, the light source is directed at a suitable angle towards the surface of the optical storage medium and consequently no mirror 15 is needed for bending the light beam. This embodiment requires fewer parts than shown in FIG. 1A, but it is assumed that a very light source is used.

1b shows another embodiment of an apparatus according to the invention. In this configuration of the device, the detector element 18 is located at or near the pivot point 101 and the light source 12 or near the pivot point 101 and the light source 12. When using a single light path propagation of the light beam, it is further necessary to bend the light beam towards the detector element 18 by providing another optical component 15b after the focusing component 17a. In addition, a detection optical element 14b may be provided in front of the detector element for focus adjustment of the reflected light beam.

According to another embodiment of the device, multiple light paths may also be used. 1B shows a splitter component 17b for dividing the light beam into more than one beam. When the splitter component is used, a detection optical element 14b is required in front of the detection optical element for each of the plurality of light beams 13b. In this embodiment, the light source 12 may emit single or multiple light beams 13a depending on the type of the light source. When the light source emits a single light path 13a, the splitter component 17 may be installed in front of the bending optical component 15a.

2A to 2C show two light beams 21 and 22 where one light beam 21 is for reading data and the other light beam 22 (bold lines) is for writing data. Figures showing the optical configuration of an apparatus according to a particular embodiment of the invention used. The optical configuration of the device includes mirrors 24 and 25 for bending the light beams. Instead of mirrors, prisms or other suitable optical components can also be used for bending of the light beams. On the substrate 23 there is integrated a detector element 26, a transmission element 28, such as a glass element and diffractive elements DOE 27 in front of the transmission element. Reflected light beams 33 are directed towards the detector element 26. In the embodiments shown in FIGS. 2A and 2B, the mirror 25 for the light beam 21 has one spot position of the focused beam on which the read beam 21 is focused on the optical storage medium 11. 29b) is provided in front of the mirror 24 for the light beam 22 so as to be formed at a position different from other spot positions 29a of the focused beam formed by the recording beam 22. According to one embodiment, there are separate spot positions for both focused beams, namely the read point 29b and the write point 29a. Such spot positions 29a, 29b can be in any direction with respect to each other on the data tracks, including, for example, a position on other tracks where one can be located before or behind another or side by side with respect to the other. It can be located at According to a preferred embodiment of the present invention, the read beam 21 defines a spot position 29b of the focused beam on the optical storage medium 11 which is preferably formed by the recording beam 22. And to form slightly ahead of the other spot positions 29a of the adjusted beam.

FIG. 2A illustrates an embodiment of the present invention using transverse light beams to read data and write data to the optical storage medium. FIG. As shown in FIG. 2B, another embodiment of the present invention uses a horizontal light beam to read data and a vertical light beam to write data to the optical storage medium. Here, "transversal" means the horizontal ratio for the optical storage medium, and "perpendicular" means the vertical ratio for the optical storage medium. The synchronization of the beam pulses will be mentioned later in this description. Synchronization of the read and write pulses allows the focus adjustment and write operations to be performed simultaneously. This embodiment allows fast random access times for the write operation. This is the most important requirement in the small device direction and provides a very small and low mass optical pick-up unit that allows for quick access. In addition, due to the reduced number of parts, this saves cost and reduces power consumption.

2C shows another embodiment of an optical configuration of an apparatus using two light beams according to the present invention. In this embodiment, the read beam 21 and the write beam 22 strike at the same spot position 29 of the focused beams. The optical configuration is different from the optical configuration shown in FIG. 2A or 2B because the mirror 24 is provided in front of the mirror 25. As shown in Fig. 2C, this embodiment of the present invention uses a horizontal light beam to read data and a vertical light beam to write data to the optical storage medium. As a result, the recording operation is performed by the vertical light beam while the focus adjustment and the track guidance are performed by the horizontal light beam. The synchronization of the read and write pulses will be mentioned later in this description. In addition, this embodiment of the present invention provides an extremely small and low mass optical pickup unit which is the most important requirement in the micro device direction. Also, due to the reduced component count, this saves cost and reduces power consumption.

3a shows one embodiment of a simple optical configuration of the device according to the invention in which the individual read 31 and write 32 beams and the reflected read beam 33 are guided through a single lens 35. to be. Diffractive elements (not shown) can be realized as surface elements. Further, this embodiment of the present invention uses a horizontal light beam for reading data and a vertical light beam for recording data with respect to the optical storage medium.

3b shows an embodiment of the optical configuration of the device according to the invention in which the individual read beam 31 and the write beam 32 and the reflected read beam 33 are guided through a single lens 35. . Optical elements for diffraction (not shown) can be realized as surface elements. In addition, optical components 36 and 37 are used to separate the incident reading beam 31 and the reflected reading beam 33 from the recording beam 32 by the wavelength or polarization of the beams. The optical components 36 and 37 can be realized using components such as polarizing splitters and dichroic beam splitters, and diffractive elements can be used in connection with these components. This embodiment has polarizations or different wavelengths in which the read and write beams are opposite to each other and the medium responds differently to light at these different polarizations or wavelengths (eg, two-photon operation). Shows that

4a shows one embodiment of an apparatus according to the invention with one access unit 41 which is preferably an arm unit. In this embodiment, the read and write beams are controlled along the arm unit 41 which pivots the pivot point 101 in three dimensions on one end as mentioned above. The arm unit is operated by a motor 43 of small size and low weight. According to this embodiment, the read beam is guided and bent to meet the optical storage medium at a horizontal angle and the recording beam is guided and bent to be perpendicular to the optical storage medium 11. In connection with one arm embodiment, all of the optical configurations mentioned in FIGS. 2A, 2B, 3A and 3B can be used. This configuration allows for simultaneous read and write operations. This also allows very fast access time for the read operation even if the write operation is performed slowly.

4b shows an embodiment of an apparatus according to the invention with a double-arm unit. In this embodiment, the read beam is controlled along the first arm 41 and the write beam is controlled along the second arm 42. Both arms pivot in three dimensions on one end of the pivot point 101. According to this embodiment, the read beam is guided and bent to meet the optical storage medium 11 at a horizontal angle, and the recording beam is guided and bent to form a horizontal or vertical direction with the optical storage medium 11. . With regard to the double-arm embodiment, all of the optical configurations mentioned in FIGS. 2A, 2B, 3A and 3B can be used. This configuration allows for simultaneous read and write operations. This also allows a very fast random access time for the read operation even if the write operation is performed slowly. The double-arm unit also makes it possible to use separate read-only drives and read / write drives, like conventional CD and CD-R drives. However, the double-arm solution adds some weight to the device, but such additional mass is not necessarily required to include two separate motors for both arms, for example through a gear system such that the motor ( 43) can be minimized by sharing some functions. The arms can be mechanically synchronized to provide more symmetrical read and write operations.

In figure 4c another embodiment of a device according to the invention is shown. Here, a conventional sledge unit 45 is used in connection with the arm unit 41 as access units according to one embodiment of the invention. In this embodiment, the read beam is guided and bent to meet the optical storage medium 11 transversely through the arm unit 41, and the write beam is stored through the sledge unit 45. It is guided and bent to be perpendicular to the medium 11. The arm unit pivots the pivot point 101 in three dimensions on one end. This embodiment adds more weight to the device than the one arm unit shown in FIG. 4A and the double-arm unit shown in FIG. 4B, because the individual motors 43, 44 allow the sledge unit ( 45 and the arm unit 41 are necessary. Although the motors 43 and 44 can be integrated into one module, the functions of the motors 43 and 44 are different. The embodiments shown in FIGS. 4B and 4C are not considered to be the best form of the present invention, since the embodiments shown in FIGS. 4B and 4C add weight, cost and complexity to the apparatus and the recording This is because the operation uses conventional optical pickup units (OPUs) as shown in FIG. 4C and these conventional optical pickup units (OPUs) have their own problems mentioned in the background of the present invention.

FIG. 5 shows one embodiment of the invention in which individual light beams or beam paths 56, 58 are created by two separate light sources 51, 52. The light beam paths 56, 58 are guided to the access unit 50 as mentioned above in this description in accordance with the present invention. In this embodiment, the individual light sources 51, 52 are synchronized by the synchronization device 55 to ensure a high level of precision in the read / write operation. 10A shows a flow diagram that briefly shows an algorithm for an embodiment with individual light sources and FIG. 10B shows a flow chart showing another algorithm for an embodiment with individual light sources.

In the following, detection of focusing and tracking signals will be described. The light beam is transmitted from the light source along a pivoted arm that can be controlled in three dimensions with respect to the pivot point. This means that the pivoted arm moves in the up-down direction, side and length (rotation about the pivot axis), i.e. the pivoted arm moves on the x-, y- and z-axis. It means to pivot about. This configuration allows the light beam to follow the data track in the direction of propagation transverse to the surface of the optical storage medium but in the lateral direction exactly in the direction perpendicular to the surface of the optical storage medium. The push-pull movement of the access unit maintains the z axis in a direction perpendicular to the surface of the optical storage medium.

The combination of the use of a transverse light beam and the use of a movable arm that is directed to and reflected from the optical storage medium provides a simple focusing and tracking function because the focusing and tracking signals are reflected light. This can be identified by following the change in intensity distribution. Reliable operation and fast random access times are achieved by simultaneous horizontal light beam focusing and simultaneous read and / or write operations.

The signal processing method depends on the presence of several diffraction light orders. The reflected light beam is separated into sub-beams, referred to as diffraction orders, starting from the center beam (diffraction order = 0) and having a plug (+) or minus (-) sign on the corresponding sides of the center beam. Assigned by ordinal numbers (-1, +1, etc.). The center beam (bold arrows 1b, 1b 'in FIGS. 7b and 7c) is zero-order diffraction corresponding to general geometric reflections. In the first approximation process, geometric optical elements can be used to analyze the shape of these orders (see FIGS. 6A-6E). Analysis of the separate orders (thin lines 1a, 1c, 1a ', 1c', 1c '' in FIGS. 7b and 7c requires optical modeling where diffraction is considered. Again as an approximation process, geometrical optical modeling was used to track the location of the center peaks of the diffraction orders The center beam and the separate orders together called the "baseball pattern" (Figs. 7G-7K) known in the prior art. Reference).

Figures 6a and 6b show the basic concept of detection of the focus adjustment signal of the device according to the invention. A detector element 18, which may preferably be a quad detector with four detector surfaces 18a, 18b, 18c, 18d, is shown in FIGS. 6c-6e (and 7d-7f). In FIG. 6A, the access unit 10, preferably the arm unit, moves relative to the optical storage medium 11 as necessary to keep the light beam in focus. 6B shows an optical element, such as a lens 16, and a detector element 18 having at least two surface elements that bend the light beam in the transverse direction towards the optical storage medium. More detectors with different geometries can also be used. According to the invention, the optical element 16 and the detector element 18 are adapted to move along the arm unit 10 using suitable fastening means. As a result of such a movable arm, the spot positions A, B, and C on the detector element 18 are moved by the movement of the optical element 16 towards or away from the optical storage medium. 11) and the gap between the optical element 16 is moved. Points A ', B', and C 'are the spot positions of the beams on the optical storage medium, respectively. In FIG. 6B, the spot position A (and A ′) represents the case where the reflected light beam is in focus on the surface of the optical storage medium 11. Correspondingly, the spot position B (and B ') indicates that the optical storage medium 11 is too close (on the focus) to the detector and the spot position C (and C') is the optical storage medium 11. ) Is too far away (under focus) from the detector. The light beam is optionally guided to the detector element 18 using an optical element in front of the detector (eg, part 28 of FIG. 2A) or a diffractive optical element (eg, part 27 of FIG. 2A). Can be.

Next, the detection made by identifying a focus adjustment signal to control the movement of the arm unit in relation to FIGS. 6C, 6D and 6E will be described. These figures illustrate a detector element 18 that is preferably a quad detector with four detector surfaces 18a, 18b, 18c, and 18d. The track direction is indicated by an arrow. For example, a collimated circular light beam can be emitted and then focused on the data layer by means of diffractive optical elements. The reflected light beam is then collimated or focused on the detector by means of diffractive optical elements. Reflected light beams from the surface of the optical storage medium are quad-shaped detectors 48 having four surface regions 18a, 18b, 18c, and 18d respectively corresponding to the light intensity signals S1, S2, S3, S4. It is received by. 6C, 6D and 6E show whether one received reflected light beam is in focus. The shape and intensity distribution of the spot on the detector 18 vary with different positions of the optical storage medium. The focal point is determined by the position of the center reflected beam along the up-down direction of the quad-shaped detector (there are additional diffraction orders that look like separate spots. These additional diffraction orders are used in tracking detection in this figure). In general, the additional diffraction orders merely add additional correction factors to the focus push-pull algorithm.) In FIG. 6C, the focus adjustment signal indicates that the surface area S2 is much wider than the surface area S3. Aligned with the containing spot 76. This means that the reflected light beam is above the focal point and the detector element is made to move downwards by controlling the access unit. In FIG. 6D, the focus adjustment signal is aligned to the spot 76 where signals S2 and S3 comprise one of the same detector surfaces. This means that the reflected light beam is in focus and no correlation is required so that the detector element is controlled to position the access unit. Finally, in FIG. 6E the focus adjustment signal is aligned to the spot 76 where the signal S2 comprises an area much narrower than the signal S3. This means that the reflected light beam is below the focal point and the detector element is made to move upwards by controlling the access unit. The baseball pattern on the surface of the detector moves according to the changed focus.

Figures 7a, 7b and 7c show very briefly the basic concept of tracking of a device according to the invention. 7G to 7K are more realistic views. 7A-7F are diagrams that intuitively illustrate one embodiment of a basic concept. In FIG. 7A, the access unit 10, preferably the arm unit, moves laterally with respect to the optical storage medium 11 to maintain the light beam on the track. 7B and 7C show a lens 16 forming a focusing beam that generates two diffraction orders relative to the center beam through reflection. In the geometric approximation process, they can be modeled as beams 1 moving towards the data track 70 of the optical storage medium 11. Each beam is then reflected towards detector element 18 having at least two, preferably four surface elements, for analysis of tracking. The reflected center beam in FIG. 7B is 1b and the reflected center beam in FIG. 7C is 1b '. Correspondingly, the reflected diffraction beams are 1a, 1c and 1a ', 1c'. FIG. 7B shows the case where the light beam is present on the track (diffraction orders (-1, 0, +1)) and FIG. 7C shows that the light beam 1c 'is the edge of the data track 70 (beam 1c "). The off track case reflected from)) is shown.

Next, the detection made by identifying the tracking signal to control the movement of the arm unit in accordance with one embodiment of the present invention, which will be briefly described, will be described with reference to FIGS. 7D, 7E and 7F. These figures illustrate a detector element 18 in which a quad detector having four detector surfaces 18a, 18b, 18c, 18d is preferred. Track direction is indicated by an arrow. For example, the circular collimated light beam 1 can be focused on the data layer by a diffractive optical element. The reflected light is then collimated or focused on the detector by the diffractive optical element. The tracking signal is detected by the detector element 18. Spot positions of the reflected beams form a baseball pattern on the four surfaces of the detector. The shape and intensity distribution of the spot on the detector 18 vary with different positions of the optical storage medium. For example, tracking characteristics can be identified by comparing the intensities received by two quadrants, such as surfaces 18a and 18d located on either side of the track. Reflected light beams from the surface of the optical storage medium (beams 1a, 1b, 1c of FIG. 7b) are divided into four surface regions (responsive to the light intensity signal S1, S2, S3, S4, respectively) It is received by the quad detector 18 with 18a, 18b, 18c, 18d. For example, in FIGS. 7D, 7E and 7F, two reflected light beams are detected and identified. In the off track case, the baseball pattern becomes asymmetric according to FIGS. 7D and 7F. In FIG. 7D, the light intensity of the spot 77a on the area of the detector surface 18a is higher than the light intensity of the spot 77b on the surface 18d, just as the signal S1 is wider than the signal S4. This means that the light beam is on the left side of the track. As a result, the detector element 18 is controlled to move to the right by controlling the access unit. In FIG. 7F, the intensity of the spot 77b on the area of the detector surface 18d is higher than the spot 77a on the surface 18a, just as the signal S4 is wider than the signal S1, which is the light beam. It means you are on the right side of the track. As a result, the detector element 18 is controlled to move to the left by controlling the access unit. In FIG. 7E, the light beams are present on the track because the intensities of the spots 77a and 77b are the same in the surface regions 18a and 18d as the signal S1 is the same as the signal S4. No calibration is required so that the detector element is positioned to control the access unit. The baseball pattern on the surface of the detector moves in accordance with the changed tracking.

The details of the reflected spot and baseball patterns are somewhat different from the idealized case mentioned above, for example, rather than remain exactly circular, the center focusing beam is deformed when present above or below the focal point. In addition, it is necessary to use a more realistic diffraction model (described below) to more practically explain the reading mechanism. The method shown above performs well as the first approximation process in nature. When the push-pull mechanism of the arm unit is used, such irregularities are not very important, because maintaining the system so that the configuration where the center spot is focused in the center of the separate baseball patterns and the quad detector is symmetrical This is because the purpose of the system. In the worst case, irregularities may require sensitivity adjustments of the push-pull mechanism in different directions, and also some degree of signals from quad detectors (which may be performed insignificantly in signal processing electronics). Asymmetry correction may be required. Likewise, the detector may be slightly misaligned from the track due to the movement of the arm, which may be corrected through similar calibrations and in some cases even ignored.

From now on, the reading scheme will be provided more physically and accurately using a more realistic diffraction model. Detection made by identifying the tracking signal to control the movement of the arm unit according to this embodiment of the invention will next be described with reference to FIGS. 7G-7K.

The tracks of the data layer form a periodic structure that functions as a reflective grating as shown in FIG. 7G, which is the top view of FIG. 7B. FIG. 7G shows the grid period t shown as tracks 70 and track spacing. This grating separates the incident beam 1 into sub-beams 1a, 1b, 1c, which sub-beams 1a, 1b, 1c are referred to as diffraction orders and are the central beam 1b. Beginning from, are assigned ordinal numbers with a minus sign 1a or a plus sign 1c on the corresponding sides of the center beam. FIG. 7G shows three diffraction orders (-I to + I) when I is 1, 2, 3, and so on. The tracking signal is generated by using interference between the 0th (reflected center beam 1b) order and the ± Ith order, the interference being in quadrants 18a, 18d as shown in FIGS. 7H-7J. Vary the intensities received. It should be noted here that coherent light is used so that the intensities of overlapping orders cannot only be added together, but instead the interference between the orders should be taken into account in the calculation of the overall intensities of the quadrants. will be.

7H-7J illustrate a detector element 18 that is preferably a quad detector with four detector surfaces 18a, 18b, 18c, 18d. Track direction is indicated by an arrow. The tracking signal is used to follow data tracks during playback of the optical storage medium. One method for generating a tracking signal in an access unit is assigned a detector surface 18a responsive to signal S1 and a detector surface 18d responsive to signal S4, and detector surfaces 18a and 18d. Is to compare the light intensities received by the two quadrants of the detector element 18 located on either side of the track. Generally, the geometry of an optical storage medium is defined, in which the intensity of one of the two quadrants increases or decreases when the spot is focused on the side of the track. The ± Ith orders partially overlap the 0th orders as shown in FIG. 7G as well as in FIGS. 7H-7J and form a baseball pattern on the detector element 18. FIG. 7I shows the case where the spot 77 is focused in the middle of the track. At this time, the signals S1 and S4 in the quadrants 18a and 18d are each the same because the case where the spot 77 is focused in the middle of the track is symmetrical and thus the -I and + Ith orders This is because the interference of the 0th order with respect to is the same. If the current spot 77 is focused on the side of the track, this spot 77 shifts the phases of the sub-beams 1a or 1c reflected through the detector. Depending on the structure of the optical storage medium and on which side of the track there is a beam, the -I or + I th order interferes with the 0 th order, i.e. the light intensity, because the quadrant Because it increases. The other orders interfer with the zeroth order, and consequently the light intensity, because the quadrant is reduced. Thus, as shown in FIG. 7H, the extinction interference in quadrant 18a provides a signal lower than the constructive interference in quadrant 18d, which means that the intensity signal S4 is the intensity signal S1. Higher, which in turn means that the light beam is to the left of the middle of the track. Thus, as shown in FIG. 7J, the constructive interference of quadrant 18a provides a higher signal than the extinction interference of quadrant 18d, which means that intensity signal S1 is higher than intensity signal S4 and As a result, it means that the light beam is to the right of the middle of the track. The constructive and destructive interference in the quadrants of the detector, and consequently the magnitude of the signal, is proportional to the distance of the spot 77 away from the track causing the signal to change as a function of distance. An imbalance of quadrant intensities can be detected and used for the generation of the tracking signal needed to cause the beam to focus on the track.

The rotation of the access unit, preferably the arm unit, changes the alignment of the detector and the tracks and the system should be able to tolerate this. Misalignment can be optimized to be less than 10 degrees and the system can be designed to allow this. This misalignment causes the intensity distribution on the detector to change symmetrically as shown in FIG. 7K. The same regions of spots, and consequently the intensities of the + I-th and -I-th orders, are converted from quadrants 18a and 18d to quadrants 18b and 18c. Because of this, the relative intensities between the quadrants 18a and 18d used to calculate the tracking signal, and the relative intensities between the quadrants 18b and 18c used to calculate the focus adjustment signal do not change and the signals have been previously known. Can be calculated as. In FIG. 7C, misalignment is exaggerated and is typically less than 10 degrees depending on the tests performed.

In the preferred embodiment, the same light beam is used to provide both the focus adjustment signal and the tracking signal. Three beams or multiple beams or other types of steering may also be used to provide focusing and tracking signals. The apparatus of the present invention is not very sensitive to angular error due to the movement of the access unit, because the baseball pattern is only slightly rotated.

The focusing and tracking signals can be investigated by simulations, such as functional electrical simulation signal calculations, for example by using a quad shaped detector element with four surface elements. Detailed calculations of the actual signals and the necessary sensitivity and corrections to perform the push-pull operation require diffraction modeling rather than the geometric model shown briefly herein. However, the diffraction addition to the model only affects the detailed results and does not affect the basic principle. It should be noted here that there may be additional optical phenomena not covered herein, such as additional diffraction from the edges of the grooves in the actual system, which appear to be meaningless because these optical phenomena are secondary phenomena. Although such optical phenomena may not be addressed herein, they may be manipulated by additional signal processing, and such specific signal processing depends on the details of the specific embodiment and thus is not addressed herein.

8 illustrates a communication comprising at least one access unit 83 and an optical storage medium drive 81 for reading data from and writing data to the optical storage medium 82 in accordance with the present invention. A diagram illustrating the device 80. The communication device also includes at least one light source 84 for emitting light beams, optical components 85 for transmitting, guiding, bending and focusing the light beams and a detector for detecting reflected light beams. Element 86. Light sources 84, such as semiconductor lasers, are used to provide the light beams needed to read and write data to / from the optical storage medium 82. When the light beam is emitted from the light source, the light beam may diverge. In other words, the emitted light beam is widened. Optical components 85 are used to limit the broadening of the light beam in order to deliver sufficient light from the light source to the desired point. In addition, the optical components 85 are used to collimate or focus the emitted light beam. A collimated light beam can be used to propagate the beam to a point far from free space and focus adjustment can be used to image the beam into an optical path or waveguide. In addition, the optical components 85 are used to direct the light beam to the data track of the optical storage medium to focus the light beam onto the data track of the optical storage medium. In front of the detector, optical components 85 are used to focus the reflected light ratio on the detector element. Such optical components, referred to herein only as reference numeral 85, will be mentioned in more detail with reference to FIGS. 1A, 1B, 2A, 2B, 3A, and 3B.

In FIG. 8, the access unit 83 pivots in three dimensions with respect to the vertical (x), horizontal (y) and length (z) axes on its end (pivot point) as shown in FIGS. 1A and 1B. do. Thus, the access unit can be controlled in at least the up-down, side and up-down direction with respect to its pivot point. The access unit 83, optical components 85 and detector element 86 for receiving and detecting the reflected light beam are the same as described in connection with FIGS. 1A, 1B, 2A and 2B. The access unit 83, optical components 85 and detector element 86 are adapted to move in accordance with the movement of the access unit. In other words, the access unit 83, the optical components 85 and the detector element 86 are fixed to the access unit using suitable fastening means. In addition, the units 84, 86 are electrically connected to the main control unit (not shown) of the apparatus and the access unit 83. The light source 84 is preferably located at or near the pivot point of the access unit. According to the above-mentioned configuration of the apparatus, the light beam emitted from the light source is directed at an angle to the data tracks of the optical storage medium. Reflected light beams reflected from the data tracks of the optical storage medium are received at transverse angles by the detector element 86 and associated optical components 85. All of the embodiments of the device mentioned above in connection with FIGS. 1A-5 are associated with a communication device 80 according to the present invention. In addition, the basic concepts of focus error correction (see FIG. 6) and track error correction (see FIGS. 7A and 7B) are associated with a communication device according to the invention.

According to another embodiment of the present invention, the light source 84 may be located at the end of the access unit different from the pivot point, that is, on the access unit head, the light beam from the light source being adapted to the data tracks. Guided at an angle to the landscape. This embodiment still reduces the number of parts because the mirrors 15, 15a (see FIGS. 1A and 1B) can be omitted and the diffractive optical element (DOE) 16 (FIG. 1a and FIG. 1b) can be used. However, this embodiment requires light sources that are smaller in size and lighter than can be obtained with current technology.

9 is a flowchart illustrating a method according to the present invention for reading data from and writing data to an optical storage medium. In the first step 901, the light source generates a light beam. Two or more separate light sources are used, but the light beams are synchronized by synchronizing the laser sources according to step 903. The synchronization algorithm used will be mentioned later in this description. In step 905 the emitted light beams may be collimated before transmitting the light beams in step 907. The emitted light beams are guided and bent in a transverse direction towards the tracks of the optical storage medium in accordance with step 909. The reflected light beams from the tracks of the optical storage medium are then transmitted at step 911 and then the reflected light beams are detected at step 913. If a focus error is detected according to steps 915 and 916 and correction is needed, then appropriate correction is made through the movement of the access unit according to step 919 and then steps 909 to 916 are repeated. If a track error is detected according to steps 917 and 918 and correction is needed, then appropriate correction is made through the movement of the access unit according to step 920 and then steps 909 to 918 are repeated. If the focusing and tracking are correct, a read and / or write operation using the wide angle beams is performed along step 921.

It should be noted here that although the control in the z-direction does not provide any novelty, it is allowed from the definition of this algorithm, but the beam is correctly aligned by obtaining the symmetry of the reflected signal through a simple push-pull algorithm. It should also be noted here that the sampling frequencies for control in the various directions (x, y, z) can be very different, and as such Fig. 9 shows only sampling for (x, y and z directions). It is just a highly idealized representation of the actual algorithm (where the sampling of the rates may differ). However, such an idealization fully shows the important features of the present invention, and the details are regarded as specific embodiments.

It is also possible to obtain more complex algorithms based on the simultaneous analysis of several push-pull loops (in the x, y and z directions). These are considered specific paradigms and details of the present invention and thus are not discussed in detail.

10a shows a synchronization algorithm of the method according to the invention when two separate light sources are used. Separate initialization routines may be required. In the first step 111, the position of the light beam of the first light source is detected in step 113 after the first light source is switched on. Further, in step 115 it is checked whether the position is on the track and in step 117 it is checked whether the position is in focus. If the response in step 115 and / or 117 is negative, suitable corrections are made according to steps 116 and 118. In step 119, the second light source may be turned on and as a result the first light source may be turned off or may remain constant. The operation of the second light source is performed at step 120 and after a successful operation 121 the second light source is turned off at step 123. Thereafter, the first light source (turns on) continues the operation performed before the interruption. In a representative embodiment of the method according to the invention there is a case where a first light source is used for a read operation and the second light source is used for a write operation. According to this embodiment, the read beam may be pulsed so that it may be off when the write beam is turned on or may remain constant on. The pull applied application in which energy is optimal and thermally optimal depends on the details of the physical implementation.

The use of other types of synchronization algorithms is also possible. Figure 10b shows a synchronization algorithm of another embodiment of the method according to the invention when two separate light sources are used. Separate initialization routines may be required. In the first step 131, after the first light source is switched on, the position of the light beam of the first light source is detected in step 133. Also in step 135 it is checked whether the position is on the track and in step 137 it is checked whether the position is in focus. If the response at step 135 and / or step 137 is negative, appropriate corrections are made according to steps 136 and 138. In step 139, the second light source is turned on, as a result of which the first light source remains on but the read / write operation is stopped for a period of time. The operation of the second light source is performed in step 140 until the period has elapsed according to steps 141 and 142. In the present step 143, the first laser source continues the read / write operation from the position where the read / write operation was stopped and the read / write operation of the second light source is stopped. According to this embodiment, both laser sources are on at the same time.

According to the present invention, other embodiments are also possible having one or more light beams of the type mentioned above, although such embodiments are simple paraphrases of the present invention but are not discussed in detail herein.

The invention is not limited to the embodiments mentioned above. While a preferred embodiment of the present invention has been disclosed herein for purposes of illustration, various changes, modifications, variations, substitutions and equivalents will be apparent to those skilled in the art, in whole or in part, in the present. Accordingly, the invention is intended to be limited only by the nature and scope of the claims appended hereto.

Claims (49)

An apparatus comprising an optical storage medium drive and at least one access unit for reading data from and writing data to an optical storage medium comprising a plurality of data tracks, the apparatus comprising at least one first optical At least one light source configured to produce a beam and at least one second light beam; Transmission means adapted to transmit and guide the first light beam and the second light beam toward data tracks of the optical storage medium; And detection means adapted to detect light beams reflected from the surface of the optical storage medium, the apparatus comprising: The access unit is adapted to pivot on one end to move in three dimensions with respect to the pivot point, The transmission means and the detection means are adapted to move in accordance with the movement of the access unit, The at least one light source is configured to be located at a pivot point of the access unit or substantially adjacent to a pivot point of the access unit, The transmission means is adapted to guide the first light beam in a horizontal direction towards the data tracks of the optical storage medium in accordance with the movement of the access unit, And the detecting means is configured to receive the reflected beams of the first or second light beam from the data tracks of the optical storage medium to control the movement of the access unit. Recording device. The optical memory according to claim 1, wherein the transmission means is configured to guide the first light beam and the second light beam in a horizontal direction toward data tracks of the optical storage medium as the access unit moves. Reading and writing device. The data track of the optical storage medium according to claim 1, wherein on the data tracks of the optical storage medium the reflected light beams are detected as being in focus and on the track by the detection means. And the access unit can be moved to a position where the first light beam and the second light beam which are transmitted toward the light beam form a first point and a second point. 4. The reading and writing apparatus of claim 3, wherein the first point is located at a position different from the second point on the data tracks of the optical storage medium. 4. The reading and writing apparatus of claim 3, wherein the first point is located slightly ahead of the second point on the data tracks of the optical storage medium. 4. The reading and writing apparatus for optical memory as claimed in claim 3, wherein the first point and the second point are located at the same crossing point on the data track of the optical storage medium. 2. The apparatus of claim 1, wherein said transmitting means is adapted to guide said first light beam in a transverse direction towards data tracks of said optical storage medium and to guide said second light beam in a direction perpendicular to data tracks of said optical storage medium. And a reading and writing device for an optical memory. 8. The method of claim 7, wherein the first optical beam is configured to read data from data tracks of the optical storage medium and the second optical beam is configured to write data to data tracks of the optical storage medium. An optical memory reading and writing device. delete 2. The apparatus of claim 1, wherein the transmitting means comprises at least one first optical component for bending the first light beam and the second light beam toward data tracks of the optical storage medium, and data tracks of the optical storage medium. And at least one second optical component for bending and focusing the first light beam and the second light beam in a horizontal direction. The optical element of claim 10, wherein the transmitting means further comprises a collimating optical element for the light source, a splitting optical element for splitting the emitted light into a plurality of light beams, and a focusing optical element associated with the second optical component. And a reading and writing device for an optical memory. 12. The apparatus of claim 10, wherein the first optical component and the second optical component are configured to bend and focus the first optical beam in a transverse direction towards the data tracks of the optical storage medium and to control the data tracks of the optical storage medium. And a single lens for bending and focusing the second light beam in a vertical direction. 12. The reading and writing apparatus of claim 10, wherein the first light beam and the second light beam are configured to have opposite polarizations. 11. The reading and writing apparatus for optical memory according to claim 10, wherein the first light beam and the second light beam are configured to have different wavelengths. 3. The laser beam of claim 1 or 2, wherein the first light beam is generated by a first laser source and is transmitted by a first transmission means, wherein the second light beam is generated by a second laser source and And a second laser source, wherein the first laser source and the second laser source are synchronized by the synchronous means. 16. The reading and writing apparatus for optical memory as claimed in claim 15, wherein the first transmitting means and the second transmitting means are configured to use the same first and second optical parts. The method of claim 1, wherein the detection means comprises at least one detector element for detecting reflected light beams of the first or second light beam, and the reflected light of the first or second light beam. And a third optical component for bending and focusing light beams. 18. The focusing optical element of claim 17, wherein the detection means is a fourth optical component for bending the reflected light beams of the first or second light beam toward the detector element, the focusing optical element installed in front of the detector element. And a splitting optical element for dividing the reflected light beams of the first or second light beam into a plurality of light beams. 18. The optical memory of claim 17 wherein the detector element comprises at least two detector surfaces for detecting a focusing signal and a tracking signal of the reflected light beams of the first or second light beam. Reading and writing device. 18. The apparatus of claim 17, wherein the detector element comprises at least one focusing signal and at least one of the reflected beams of the first or second light beam received from the surface of the optical storage medium through the detector surface of the detector element. Configured to detect a tracking signal, the detector element of the access unit in accordance with a focusing signal and a tracking signal detected by the detector surface to maintain the first light beam and the second light beam in focus and on the track. A reading and writing device for an optical memory, characterized in that it is configured to control movement. 18. The apparatus of claim 17, wherein the detector element comprises at least one focusing signal and at least one of the reflected beams of the first or second light beam received from the surface of the optical storage medium through the detector surface of the detector element. Detect an identification of a change in intensity distribution of the tracking signal, wherein the detector element follows the change in intensity distribution to maintain the first light beam and the second light beam in focus and on the track. A reading and writing device for an optical memory, characterized in that it is configured to control movement. 19. The reading and writing device for optical memory as claimed in claim 18, wherein the focusing optical element provided in front of the detector element comprises diffractive optical elements. The method of claim 1, wherein the transmitting means and the detecting means are adapted to transmit reflected light beams of the first and second light beams or the first or second light beam along the access unit. A reading and writing device for an optical memory, characterized by further comprising a waveguide or an optical path. The reading and writing device for optical memory according to claim 1 or 2, wherein the access unit is an arm unit. 3. The apparatus of claim 1 or 2, wherein the apparatus comprises a first access unit for reading data from the optical storage medium, and a second access unit for writing data to the optical storage medium, And the second access unit is any one of an arm unit, a sledge unit or any combination of an arm and a sledge unit. The reading and writing device for optical memory according to claim 1 or 2, wherein the device is a communication device. A method of reading data from and writing data to an optical storage medium in an apparatus comprising at least one access unit, the method comprising: storing data by at least one optical storage medium comprising a plurality of data tracks; Controlling an operation of the device by an optical storage medium driver; Generating at least one light source at least one first light beam and at least one second light beam; The first and second light beams being transmitted and guided toward data tracks of the optical storage medium; And detecting light beams reflected from the surface of the optical storage medium. The method, Arranging at least one light source to be substantially adjacent to or from a pivot point of the access unit; Guiding the first light beam and the second light beam in a horizontal direction toward data tracks of the optical storage medium in three dimensions; Receiving reflected beams of the first or second light beam from the data tracks of the optical storage medium in three dimensions; And And moving in three dimensions relative to the pivot point on one end such that the access unit focuses and tracks the first and second light beams. 28. The method of claim 27, wherein the first light beam and the second light beam are transmitted and a reflected light beam of the first light beam or the second light beam is detected such that the first light beam and the second light beam are detected. At least one first focused beam and at least one second focused beam on the data tracks of the optical storage medium based on the beam and the reflected light beams of the first or second light beam. And controllable by said access unit to a position to form said memory. 29. The method of claim 28, wherein the method further comprises: the first focused beam forming at least one first point and the second focused beam defining at least one second point on data tracks of the optical storage medium. Reading and writing method for optical memory, comprising the steps of forming; 30. The method of claim 29, wherein the first point is located at a location different from the second point on data tracks of the optical storage medium. 30. The method of claim 29, wherein the first point is located slightly ahead of the second point on data tracks of the optical storage medium. 30. The method of claim 29, wherein the first point and the second point are located within the same intersection on a data track of the optical storage medium. 33. The method of any of claims 27-32, wherein the method transmits and guides the first light beam transversely toward the data tracks of the optical storage medium, and wherein the second light beam is connected to the optical storage medium. And transmitting and guiding in a direction perpendicular to the data tracks. 34. The method of claim 33, wherein the method comprises the first optical beam reading data from data tracks of the optical storage medium and the second optical beam writing data to data tracks of the optical storage medium. A read and write method for an optical memory. 33. The method according to any one of claims 27 to 32, wherein the method bends at least one of the first optical beam and the second optical beam toward the data tracks of the optical storage medium. And bending and focusing the first light beam and the second light beam in a horizontal direction towards the data tracks of the optical storage medium by a second optical component of the optical storage medium. 36. The method of claim 35, wherein the collimating optical element collimates the light source, splits the light emitted by the splitting optical element into a plurality of light beams, and wherein the focusing optical element associated with the second optical component is And focusing the light beams. 36. The method of claim 35, wherein the first optical component and the second optical component bend and focus the first optical beam in a transverse direction towards the data tracks of the optical storage medium and the data track of the optical storage medium. And a single lens that bends and focuses the second light beam in a direction perpendicular to the light beam. 36. The method of claim 35, wherein said first and second light beams have opposite polarizations. 36. The method of claim 35, wherein the first light beam and the second light beam have different wavelengths. 28. The method of claim 27, wherein the method further comprises: generating a first laser source to the first light beam and generating a second laser source to the second light beam; And synchronizing the first laser source and the second laser source, The synchronization step, Separately initializing the first laser source and the second laser source, The first laser source is turned on, The first laser source emits the first light beam and the first point is located for read / write operation, Analyzing the position of the first point; Analyzing focusing and tracking of the first point; The second laser source is turned on, The second laser source emits the second light beam and the second point is located for read / write operation, and And the second laser source is turned off following the read / write operation. 41. The method of claim 40, wherein the synchronizing step is caused by the second laser source being turned on so that the first laser source is in a pause mode for a predetermined period of time for the first point and the first laser source is And continuing to perform a read / write operation from said first point after a period of time, and causing said second laser source to enter a suspend mode. 33. The method of any one of claims 27-32, wherein the method further comprises at least one detector element detecting the reflected light beams of the first or second light beam and the third optical component of the first light. And bending and focusing the reflected light beams of the beam or of the second light beam. 43. The method of claim 42, wherein the method further comprises focusing an optical element for focusing, wherein a fourth optical component bends the reflected light beams of the first or second light beam toward the detector element and is installed in front of the detector element. And the splitting optical element splits the reflected light beams of the first or second light beam into a plurality of light beams. 43. The optical memory of claim 42 wherein the detector element comprises at least two detector surfaces for detecting a focusing signal and a tracking signal of the reflected light beams of the first or second light beam. For reading and writing. 43. The apparatus of claim 42, wherein the detector element comprises at least one focusing signal and at least one of reflected beams of the first or second light beam received from the surface of the optical storage medium through the detector surface of the detector element. A tracking signal, wherein the detector element moves in accordance with the focus adjustment signal and the tracking signal detected by the detector surface to maintain the first light beam and the second light beam in focus and on the track. Read and write method for an optical memory, characterized in that for controlling. 43. The apparatus of claim 42, wherein the detector element comprises at least one focusing signal and at least one of reflected beams of a first or second light beam received from a surface of the optical storage medium through a detector surface of the detector element. Detecting an identification of a change in intensity distribution of the tracking signal, the detector element following the change in intensity distribution to maintain the first light beam and the second light beam in focus and on the track A read and write method for an optical memory, characterized in that for controlling. 33. A method according to any of claims 27 to 32, wherein said access unit is an arm unit. 33. The method of any one of claims 27 to 32, wherein the method comprises the steps of a first access unit reading data from the optical storage medium and a second access unit writing data to the optical storage medium, And the first and second access units are any one of an arm unit, a sledge unit or any combination of arm and sledge unit. 33. A method according to any of claims 27 to 32, wherein the device is a communication device.

Images