CD-ROM drives and data processing devices

Abstract

This application provides an optical drive for optical storage. The optical drive includes an optical read unit (OPU), a drive motor, a guide rail, and a spindle motor. The spindle motor carries and rotates the optical disc. The drive motor moves the OPU along the guide rail to read or store data on the optical disc. The OPU's motion trajectory is a combination of unidirectional linear motion and sinusoidal motion. In the technical solution provided in this application, by applying repetitive sinusoidal motion to the drive motor, the movement range of the objective lens can be reduced, thereby reducing the distance variation between two light spots caused by the objective lens movement, and thus improving the reliability of data storage or retrieval.

Description

Technical Field

[0001] This application relates to the field of optical storage, and more particularly to optical drives and data processing devices. Background Technology

[0002] In Blu-ray multi-layer storage solutions, to increase the storage capacity of optical discs, multiple data tracks in the data layer can share the wobble track of the wobble layer. The wobble layer is also called the wobble layer. The wobble track is also called the wobble track. The optical drive generates two beams. The red and blue light spots maintain a fixed distance. The red light focuses and tracks on the wobble layer. The blue light focuses on the data layer. The blue light tracks and follows the red light. In practical applications, the center of the wobble track is not concentric with the rotation center of the optical disc; there is an offset distance between them. Therefore, to allow the red light to follow the wobble track, the position of the objective lens in the optical pick-up unit (OPU) needs to be changed by the OPU motor, causing the objective lens to move radially along the optical disc. Each rotation of the optical disc creates a periodic sine wave in the objective lens's trajectory. Therefore, the objective lens's motion trajectory consists of repetitive sinusoidal motion.

[0003] When the objective lens position changes, it affects the distance between the two light spots. Furthermore, this distance is affected by the eccentricity. Therefore, the distance between the two light spots may differ each time the disc is repositioned, thus affecting data storage or retrieval. Summary of the Invention

[0004] This application provides an optical drive and a data processing device that, by applying repetitive sinusoidal motion to a drive motor, reduces the movement range of the objective lens, thereby reducing the distance variation between two light spots caused by the objective lens movement, and thus improving the reliability of data storage or retrieval.

[0005] The first aspect of this application provides an optical drive. It includes an OPU, a drive motor, a guide rail, and a spindle motor. The spindle motor carries and rotates the optical disc. The drive motor drives the OPU to move along the guide rail to read data stored on the optical disc or to store data on the optical disc. The movement trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion.

[0006] In one alternative embodiment of the first aspect, the OPU includes an OPU motor and an objective lens. The OPU motor is used to drive the objective lens in a linear reciprocating motion along the radial direction of the optical disc. The range of motion for the linear reciprocating motion is less than or equal to 10 micrometers. By limiting the range of motion for the linear reciprocating motion, the distance variation between the two light spots can be further reduced, thereby improving the reliability of data storage or retrieval.

[0007] In one alternative embodiment of the first aspect, the optical drive further includes processing circuitry. The OPU also includes a laser and a photodetector. The laser generates a first light beam, which is incident on the optical disc through an objective lens. The photodetector receives the first light beam reflected from the optical disc through the objective lens and converts the reflected first light beam into an electrical signal. The processing circuitry obtains a first drive signal based on the electrical signal. A drive motor drives the OPU to move along a guide rail according to the first drive signal. Obtaining the drive signal for the drive motor through an electrical signal improves the similarity between the sinusoidal motion and the actual deviation caused by concentricity in the synthesized motion, thereby improving the reliability of data storage or retrieval.

[0008] In one alternative embodiment of the first aspect, the OPU motor is used to drive the objective lens to perform linear reciprocating motion along the radial direction of the optical disc according to a second drive signal. The processing circuit is also used to obtain a third drive signal based on the second drive signal and an electrical signal. The drive motor is further used to drive the OPU to move along a guide rail according to the third drive signal. The second drive signal may also contain a motion trajectory that can be converted into sinusoidal motion. By transferring this portion of the motion trajectory to the drive motor, the movement range of the objective lens can be further reduced, thereby improving the reliability of data storage or retrieval.

[0009] In one alternative embodiment of the first aspect, the drive motor includes a stator and a mover. The mover and the OPU are fixed. The stator and the guide rail are relatively fixed in position. The drive motor is used to drive the mover and the OPU to move along the guide rail.

[0010] In one alternative embodiment of the first aspect, the stator is a permanent magnet, and the mover is a coil.

[0011] In one alternative embodiment of the first aspect, the number of stator pairs is 2, and the stator and guide rails are arranged in parallel. By increasing the number of stator pairs, the stability of the OPU during synthetic motion can be improved, thereby enhancing the reliability of data storage or retrieval.

[0012] A second aspect of this application provides a data processing apparatus. The data processing apparatus includes a processor and an optical drive as described in the first aspect or any alternative embodiment of the first aspect. The processor is used to transmit data to and / or receive data from the optical drive. When the processor transmits data to the optical drive, the optical drive stores data on an optical disc. When the processor receives data from the optical drive, the optical drive reads data stored on the optical disc.

[0013] A third aspect of this application provides a data reading or storage method. This data reading or storage method can be applied to data processing devices or optical drives. The following description uses the application of the data reading or storage method to a data processing device as an example. The data reading or storage method includes the following steps: the data processing device rotates an optical disc; the data processing device drives an OPU (Optical Processing Unit) to move along a guide rail via a drive motor to read data stored on the optical disc or store data on the optical disc. The movement trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion.

[0014] In an alternative embodiment of the third aspect, the data reading or storage method further includes the following step: the data processing device drives the objective lens in the OPU to perform a linear reciprocating motion along the radial direction of the optical disc via an OPU motor. The range of motion for the linear reciprocating motion is less than or equal to 10 micrometers.

[0015] In an alternative embodiment of the third aspect, the data reading or storage method further includes the following steps: a data processing device generates a first light beam and directs the first light beam onto an optical disc through an objective lens; the data processing device receives the first light beam reflected from the optical disc and converts the reflected first light beam into an electrical signal; the data processing device obtains a first drive signal based on the electrical signal. The data processing device drives a drive motor via the first drive signal, causing the drive motor to move the OPU along a guide rail.

[0016] In an alternative embodiment of the third aspect, the data processing device drives the OPU motor via a second drive signal, causing the OPU motor to drive the objective lens in the OPU to reciprocate linearly along the radial direction of the optical disc. The data reading or storage method further includes the following step: the data processing device obtains a third drive signal based on the second drive signal and an electrical signal. The data processing device drives the drive motor via the third drive signal, causing the drive motor to move the OPU along a guide rail.

[0017] A fourth aspect of this application provides a drive motor. The drive motor includes a stator and a mover. The mover is fixed to the OPU. The drive motor drives the mover and the OPU to move along a guide rail. The stator and the guide rail are relatively fixed in position.

[0018] In one alternative of the fourth aspect, the stator is a permanent magnet and the mover is a coil.

[0019] In one alternative of the fourth aspect, the number of stator pairs is 2, and the stator and guide rail are arranged in parallel. Attached Figure Description

[0020] Figure 1a A front view of an optical drive provided in an embodiment of this application;

[0021] Figure 1b This is a first side view of an optical drive provided in an embodiment of this application;

[0022] Figure 1c A schematic diagram of the red light tracking closed loop provided in the embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the OPU provided in the embodiments of this application;

[0024] Figure 3 A schematic diagram of unidirectional linear motion and sinusoidal motion provided for embodiments of this application;

[0025] Figure 4 A schematic diagram of the composite motion and linear reciprocating motion provided in the embodiments of this application;

[0026] Figure 5 A schematic diagram of the trajectory of red light provided in an embodiment of this application;

[0027] Figure 6a A second side view of an optical drive provided in an embodiment of this application;

[0028] Figure 6b A third side view of an optical drive provided in an embodiment of this application;

[0029] Figure 6c A fourth side view of an optical drive provided in an embodiment of this application;

[0030] Figure 6d The fifth side view of the optical drive provided in the embodiments of this application;

[0031] Figure 7 This is a schematic diagram of the structure of the data processing device provided in the embodiments of this application;

[0032] Figure 8 This is a flowchart illustrating the data reading or storage method provided in the embodiments of this application. Detailed Implementation

[0033] This application provides an optical drive and data processing device. By applying repetitive sinusoidal motion to a drive motor, the movement range of the objective lens can be reduced, thereby reducing the distance variation between two light spots caused by the objective lens movement, and thus improving the reliability of data storage or retrieval. It should be understood that the terms "first," "second," etc., used in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as indicating or implying order. Furthermore, for the sake of brevity and clarity, reference numerals and / or letters are repeated in several figures of this application. This repetition does not indicate a strict limiting relationship between the various embodiments and / or configurations.

[0034] The optical drive provided in this application is applied in the field of optical storage. In Blu-ray multilayer storage solutions in the field of optical storage, to increase the storage capacity of the optical disc, multiple data tracks in the data layer can share the swing track of the swing layer. The optical drive generates dual beams. The red light spot and the blue light spot maintain a fixed distance. The red light is focused and tracks the swing track of the swing layer. The blue light is focused on the data layer. The blue light tracks and follows the red light. However, when the position of the objective lens in the optical drive changes, it affects the distance between the two light spots, thereby affecting the storage or retrieval of data.

[0035] Therefore, this application provides an optical drive. Figure 1a This is a front view of the optical drive provided in an embodiment of this application. Figure 1b This is a first side view of an optical drive provided in an embodiment of this application. Figure 1a and 1b As shown, the optical drive includes an optical pick-up unit (OPU) 3, a drive motor (including a permanent magnet 1 and a coil 2), a guide rail 4, and a spindle motor (not shown in the figure). The spindle motor is used to carry and rotate the optical disc 7. The drive motor is also called a sled motor or the first motor. The drive motor drives the OPU 3 to move along the guide rail 4. Figure 1a In the example, OPU 3 and coil 2 are connected by a rigid connector 6. When coil 2 is energized, it drives OPU 3 to move along guide rail 4. The direction of movement of OPU 3 is radial (positive or negative Y-axis in the figure). The trajectory of OPU 3 is a combination of unidirectional linear motion and sinusoidal motion. During the movement of OPU 3 along guide rail 4, OPU 3 is used to read data stored on optical disc 7 or to store data on optical disc 7. Optical disc 7 is also called a CD, CD disk, or optical disc.

[0036] exist Figure 1a and Figure 1b In this optical drive, OPU 3 includes objective lens 5 and an OPU motor. The OPU motor is used to change the position of objective lens 5. Specifically, the optical disc 7 includes a swing track for the swing layer and a data track for the data layer. The red light generated by OPU 3 is focused and tracks the swing track. The blue light is focused on the data track of the data layer. The blue light tracks and follows the red light. Theoretically, through the combined motion of OPU 3, the red light can be focused and tracks the swing track. However, due to the influence of the processing precision, deformation, or vibration of the optical disc 7, there may still be a deviation between the red light spot and the swing track. Therefore, the optical drive can activate the red light tracking closed loop, changing the position of objective lens 5 in OPU 3 through the OPU motor, so that the red light can follow the swing track. Figure 1c A schematic diagram of a red light tracking closed-loop system provided in an embodiment of this application. Figure 1cAs shown, the optical drive acquires the actual and target positions of the red light spot in real time and generates a drive signal based on these positions. The OPU motor adjusts the position of the objective lens 5 according to the drive signal. The drive motor changes the position of the OPU 3 according to the drive signal obtained from the synthesized motion. The change in the position of the OPU 3 changes the position of the objective lens 5, thus affecting the position of the objective lens 5. After the position of the objective lens 5 is changed by the OPU motor and the drive motor, the optical drive acquires the actual and target positions of the red light spot again, and repeats the above steps.

[0037] In practical applications, the size of the motion range of the objective lens 5 is positively correlated with the change in distance between the two light spots; that is, the larger the motion range of the objective lens 5, the greater the change in distance between the two light spots. In this embodiment, by applying repetitive sinusoidal motion to the drive motor, the motion range of the objective lens 5 can be reduced, thereby reducing the change in distance between the two light spots caused by the motion of the objective lens 5, and thus improving the reliability of data storage or retrieval.

[0038] In practical applications, objective lens 5 is also called a focusing lens. Objective lens 5 is used to illuminate the optical disc 7 with red and blue light beams. Objective lens 5 can also be used to reduce or eliminate spherical aberration. The structure of OPU is described below as an example. Figure 2 This is a schematic diagram of the structure of the OPU provided in an embodiment of this application. Figure 2As shown, OPU 3 includes an objective lens 5, an OPU motor 201, an intermediate lens group 202, a first collimating lens 209, a first laser 210, a first detector 208, a second laser 207, a second collimating lens 206, and a second detector 211. The first laser 210 generates red light (dotted lines) and transmits it to the first collimating lens 209. The first collimating lens 209 collimates the red light, making it parallel and eliminating chromatic aberration. The first collimating lens 209 also transmits red light to the objective lens 5 through the intermediate lens group 202. The objective lens 5 eliminates spherical aberration in optical aberrations, transmits red light to the optical disc 7, and receives the reflected beam of red light from the optical disc 7. The objective lens 5 also transmits the reflected beam of red light to the first detector 208 through the intermediate lens group 202. The first detector 208 converts the reflected beam of red light into a first electrical signal. The first electrical signal can be used to determine the actual position of the red light illuminating the optical disc 7. Similarly, the second laser 207 generates blue light (dashed line) and transmits it to the second collimating lens 206. The second collimating lens 206 transmits blue light to the objective lens 5 through the intermediate lens group 202. The objective lens 5 transmits blue light to the optical disc 7. The blue light can be used to store or retrieve data on the optical disc 7. When the blue light is used to retrieve data on the optical disc 7, the objective lens 5 also receives the reflected beam of blue light from the optical disc 7 and transmits the reflected beam of blue light to the second detector 211 through the intermediate lens group 202. The second detector 211 converts the reflected beam of blue light into a second electrical signal. The second electrical signal is the data stored on the optical disc 7. The OPU motor 201 drives the objective lens 5 to perform linear reciprocating motion along the radial direction of the optical disc 7. The intermediate lens group 202 includes a dichroic mirror 203, a first beam splitter 204, and a second beam splitter 205. The first beam splitter 204 separates red light and the reflected beam of red light. The second beam splitter 205 is used to separate the blue light and its reflected beam. In the beam propagation direction, the dichroic mirror 203 is used to combine the red and blue light beams. In the reflected beam propagation direction, the dichroic mirror 203 is used to separate the reflected red light and the reflected blue light beam.

[0039] according to Figure 1a and Figure 1b As can be seen from the description, the motion trajectory of OPU 3 is a composite motion of linear motion and sinusoidal motion. Figure 3 The diagram illustrates the curves of unidirectional linear motion and sinusoidal motion provided in the embodiments of this application. Figure 3As shown, the horizontal axis represents time, and the vertical axis represents the distance traveled. The composite motion curve 301 is equal to the superposition of the sinusoidal motion curve 302 and the unidirectional linear motion curve 303. In the optical disc 7, the swing track and data track are spiral lines running from the inside out. Therefore, when the optical drive reads data from the optical disc 7, the drive motor needs to drive OPU 3 to move unidirectionally from the inside out along the optical disc. Furthermore, the center of the swing track and the rotation center of the optical disc 7 are not concentric; there is an eccentric distance between them. Therefore, in order for the red light to follow the swing track, the drive motor needs to change the position of OPU 3, causing OPU 3 to move radially along the optical disc 7. Each rotation of the optical disc 7 forms a periodic sine wave in the movement trajectory of OPU 3. Therefore, the motion trajectory of OPU 3 includes repeating sinusoidal motion. In summary, the motion trajectory of OPU 3 is a composite motion of unidirectional linear motion and sinusoidal motion.

[0040] exist Figure 3 In the example, curve 302 of the sinusoidal motion is a single-harmonic sine curve. It should be understood that... Figure 3 The sinusoidal motion curve 302 provided is merely an example provided in the embodiments of this application. In practical applications, the curve of repeated sinusoidal motion can be a sinusoidal curve with multiple harmonics. Among the sinusoidal curves with multiple harmonics, the first harmonic sinusoidal curve has the largest amplitude.

[0041] according to Figure 1a and Figure 1b As described in the text, in addition to the above-mentioned synthetic motion, the optical drive also needs to activate the red light tracking closed loop, and change the position of the objective lens 5 in the OPU 3 through the OPU motor so that the red light can follow the swing track. Figure 4 This is a schematic diagram of the composite motion and linear reciprocating motion provided in the embodiments of this application. The motion generated by the objective lens 5 through the red light tracking closed loop is called linear reciprocating motion. Both the linear reciprocating motion of the objective lens 5 and the composite motion of the OPU 3 change the position of the objective lens 5 or the position of the red light illuminating the optical disc 7. Therefore, as... Figure 4 As shown, the horizontal axis represents time, and the vertical axis represents the distance traveled. The motion curve 401 of objective lens 5 or the red light spot is equal to the superposition of the composite motion curve 301 and the linear reciprocating motion curve 402.

[0042] In practical applications, the amplitude of curve 302 depends on the deviation between the center of the oscillating track and the rotation center of the optical disc 7. The greater the deviation, the greater the amplitude of curve 302. Typically, the amplitude of curve 302 can reach 100 micrometers. In this embodiment, by applying repetitive sinusoidal motion to the drive motor, the motion range of the linear reciprocating motion can be reduced. For example, the motion range of the linear reciprocating motion is less than or equal to 10 micrometers.

[0043] In practical applications, the drive motor is used to move the OPU 3 along the guide rail 4 according to the first drive signal. Figure 3 As described above, the composite motion obtained from the first drive signal can be decomposed into unidirectional linear motion and sinusoidal motion. The speed of the unidirectional linear motion is related to the rotational speed of the optical disc 7 and the type of the optical disc 7. For example, when the type of the optical disc 7 is a uniform linear speed optical disc, the speed of the unidirectional linear motion is related to the rotational speed of the optical disc 7 and the radius position. The radius position refers to the distance between the light spot and the center of the optical disc 7. The sinusoidal motion can be obtained based on the deviation between the center of the oscillating track and the rotational center of the optical disc 7. This application does not limit the method of obtaining the deviation. For example, the optical drive also includes an eccentricity measuring device, which measures the deviation between the two. In order to reduce the hardware cost of the optical drive, the optical drive can obtain the deviation through OPU 3. This will be described below.

[0044] OPU 3 includes a laser (e.g.) Figure 2 The first laser 210 in the middle), photodetector (e.g. Figure 2 The first detector (208) is used in the optical disc 7. A laser generates a first beam, which is then incident on the optical disc 7 via the objective lens 5. With the first beam focused stably and red light tracking in an open-loop configuration, the photodetector receives the first beam reflected from the optical disc 7 via the objective lens 5 and converts the reflected beam into an electrical signal. This electrical signal carries information related to the deviation. Figure 5 This is a schematic diagram of the trajectory of red light provided in an embodiment of this application. Figure 5 As shown, the horizontal axis represents time, and the vertical axis represents position. With the red light tracking in open-loop mode, and only the unidirectional linear motion of the drive motor activated, the red light trajectory will alternately intersect with the data layer track and the swing layer track during one rotation of the optical disc 7. Specifically, when time equals 0, the red light trajectory intersects with the swing layer track (i.e., the red light spot is positioned on the swing track). After one rotation of the optical disc 7 (at... Figure 5 When the horizontal axis is 0.025, the red light trajectory and the oscillating layer track intersect again. The position of the red light spot characterizes the relevant information of the deviation. The optical drive also includes processing circuitry. The processing circuitry is used to obtain the trajectory of the sinusoidal motion based on the electrical signal. For example, the processing circuitry is used to obtain the first repetition error RRO1 according to the following formula.

[0045]

[0046] Wherein, TES(k,j) includes N*j values. RRO1 includes j values. The j values ​​correspond one-to-one with the j sectors of the optical disc. Each of the j values ​​represents the position where the first beam illuminates the optical disc. N represents the number of rotations of the optical disc. The first repetition error is the relevant information of the deviation. The first repetition error corresponds to the trajectory of the sinusoidal motion. The speed of the unidirectional linear motion corresponds to the trajectory of the unidirectional linear motion. The processing circuit is used to obtain the trajectory of the composite motion based on the trajectory of the sinusoidal motion and the trajectory of the unidirectional linear motion, and to obtain the first drive signal based on the trajectory of the composite motion. The drive motor is used to drive OPU 3 to move along guide rail 4 according to the first drive signal.

[0047] After the drive motor moves the OPU 3 along the guide rail 4 according to the first drive signal, the optical drive activates the red light tracking closed loop. At this time, the optical drive can receive the reflected beam of red light through the first detector and convert the reflected beam of red light into a first electrical signal. The optical drive is also used to obtain the actual position of the red light spot according to the first electrical signal, and obtain a second drive signal through the actual position and the target position. The OPU motor is used to drive the objective lens 5 to perform linear reciprocating motion along the radial direction of the optical disc 7 according to the second drive signal.

[0048] In practical applications, the second drive signal carries trajectory information of linear reciprocating motion. The processing circuit can extract the trajectory of low-frequency sinusoidal motion from the trajectory information of linear reciprocating motion, and superimpose the trajectory of low-frequency sinusoidal motion with the sinusoidal motion trajectory obtained from the electrical signal to obtain a new sinusoidal motion trajectory. For example, under red light tracking closed loop, after the optical disc 7 rotates once, the processing circuit collects the second drive signal during this revolution. The processing circuit converts the second drive signal into TES(k,j). The processing circuit performs a Fourier transform on TES(k,j) to obtain a frequency domain electrical signal. The processing circuit extracts the low-frequency electrical signal from the frequency domain electrical signal. The processing circuit also performs an inverse Fourier transform on the low-frequency electrical signal to obtain the second repetition error. The processing circuit superimposes the second repetition error and the first repetition error to obtain the third repetition error. The third repetition error corresponds to the new sinusoidal motion trajectory. The processing circuit obtains the composite motion trajectory based on the new sinusoidal motion trajectory and the unidirectional linear motion trajectory, and obtains the third drive signal based on the composite motion trajectory. The drive motor is used to drive the OPU 3 to move along the guide rail 4 according to the third drive signal.

[0049] In this embodiment, the drive motor includes a stator and a mover. The mover and OPU 3 are fixed. The stator and guide rail are relatively fixed in position. The drive motor is used to drive the mover and OPU 3 to move along the guide rail 4. Figure 1a and Figure 1bIn the example, the stator is a permanent magnet and the mover is a coil. In practical applications, the drive motor can also be configured in the opposite way. In this case, the stator is a coil and the mover is a coil permanent magnet.

[0050] exist Figure 1a and Figure 1b In the example, to improve the stability of OPU 3 during the synthetic motion process, the number of stator pairs is 2. Specifically, the drive motor includes two pairs of stators, each pair including one N-pole permanent magnet and one S-pole permanent magnet. The stators and guide rails 4 are arranged in parallel. It should be understood that in practical applications, those skilled in the art can increase or decrease the number of stators as needed.

[0051] exist Figure 1b In the example, OPU 3 is inside coil 2. In practical applications, OPU 3 can also be outside coil 2. When OPU 3 is outside coil 2, coil 2 consists of two coil parts. The two coil parts can be connected in parallel or in series. Figure 6a This is a second side view of an optical drive provided in an embodiment of this application. Figure 6a As shown, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in series. Each of the two coils is wound around a permanent magnet with an S pole. The outer coil of coil 602 is connected to the inner coil of coil 601. Figure 6b This is a third side view of an optical drive provided in an embodiment of this application. Figure 6b As shown, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in series. Coil 601 is wound around a south-pole permanent magnet. Coil 602 is wound around a north-pole permanent magnet. The outer coil of coil 602 is connected to the outer coil of coil 601. Figure 6c This is a fourth side view of the optical drive provided in an embodiment of this application. Figure 6c As shown, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in parallel. Each of the two coils is wound around a permanent magnet with an S pole. The outer coil of coil 602 and the inner coil of coil 601 are connected in parallel. Figure 6d This is a fifth side view of the optical drive provided in an embodiment of this application. Figure 6d As shown, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in parallel. Coil 601 is wound around a south-pole permanent magnet. Coil 602 is wound around a north-pole permanent magnet. The outer coil of coil 602 is connected in parallel with the outer coil of coil 601.

[0052] The optical drive provided in this application has been described above. The data processing device and data reading or storage method provided in this application will be described below. Figure 7 This is a schematic diagram of the structure of the data processing device provided in an embodiment of this application. Figure 7As shown, the data processing device 700 includes a processor 702 and an optical drive 701. The processor 702 can be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor 702 may further include a hardware chip or other general-purpose processor. The aforementioned hardware chip can be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The processor 702 is used to transmit data to and / or receive data from the optical drive 701. The optical drive 701 is used to read data from and / or store data on the optical disc. When the processor 702 transmits data to the optical drive 701, the optical drive 701 stores data on the optical disc. When the processor 702 receives data from the optical drive, the optical drive 701 reads the data stored on the optical disc. It should be understood that the description of the optical drive 701 can be referenced to the foregoing description. Figures 1a to 6d Description of any one of the figures.

[0053] In other embodiments, the data processing device 700 may further include a memory. The memory may be volatile memory or non-volatile memory, or may include both. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), or flash memory, etc. The volatile memory may be random access memory (RAM). The memory is used to store data received from the optical drive 701 and / or the memory is used to store data transmitted to the optical drive 701.

[0054] Figure 8 This is a flowchart illustrating a data reading or storage method provided in an embodiment of this application. The data reading or storage method can be applied to data processing devices or optical drives. The following description uses the application of the data reading or storage method to a data processing device as an example. Figure 8 As shown, the data reading or storage method includes the following steps.

[0055] In step 801, the data processing device rotates the optical disc.

[0056] Data processing equipment uses a spindle motor to carry and rotate optical discs. Optical discs are also called CDs, CD disks, or optical discs. Data processing equipment can rotate optical discs using methods such as uniform linear speed, uniform angle, or partitioned uniform linear speed.

[0057] In step 802, the data processing device drives the OPU to move along the guide rail via a drive motor to read data stored on the optical disc or to store data on the optical disc. The movement trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion.

[0058] The data reading or storage method further includes the following steps: A data processing device generates red and blue light. The red light is focused and tracks the oscillating track of the oscillating layer. The red light spot and the blue light spot maintain a fixed distance. The blue light tracks and follows the red light. The data processing device drives the objective lens in the OPU to reciprocate linearly along the radial direction of the optical disc via an OPU motor, so that the red light tracks the oscillating track. When the position of the objective lens changes, the distance between the red light spot and the blue light spot changes. The size of the objective lens's motion range is positively correlated with the change in distance between the two spots; that is, the larger the objective lens's motion range, the greater the change in distance between the two spots. In this embodiment, by applying repetitive sinusoidal motion to the drive motor, the motion range of the objective lens can be reduced, thereby reducing the change in distance between the two spots caused by the objective lens's motion, thus improving the reliability of data storage or reading.

[0059] It should be understood that the description of the data reading or storage method and the foregoing Figures 1a to 6d The descriptions of the optical drive in any of the diagrams are similar. Therefore, regarding Figure 8 For a description of the data reading or storage methods, please refer to the foregoing. Figures 1a to 6d The diagram illustrates the description of an optical drive. For example, the linear reciprocating motion range is less than or equal to 10 micrometers. Another example is a data processing device receiving a first light beam reflected from an optical disc and converting it into an electrical signal; the data processing device then obtains a first drive signal based on the electrical signal. The data processing device uses this first drive signal to drive a drive motor, causing the drive motor to move the OPU along the guide rail.

[0060] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. An optical drive, characterized by, The optical drive comprises an optical pickup unit (OPU), a driving motor, a guide rail and a spindle motor, wherein: the spindle motor is used to carry and rotate an optical disc; the driving motor is used to drive the OPU to move along the guide rail to read data stored on the optical disc or store data on the optical disc, and the movement track of the OPU is a combined movement of one-way linear movement and sinusoidal movement; the OPU comprises an objective lens, and the objective lens performs linear reciprocating movement along the radial direction of the optical disc.

2. The optical drive of claim 1, wherein, the OPU comprises an OPU motor; the OPU motor is used to drive the objective lens to perform linear reciprocating movement along the radial direction of the optical disc, and the movement range of the linear reciprocating movement is less than or equal to 10 microns.

3. The optical drive of claim 2, wherein, the optical drive further comprises a processing circuit, and the OPU further comprises a laser and a light detector; the laser is used to generate a first light beam, and the first light beam is incident on the optical disc through the objective lens; the light detector is used to receive the first light beam reflected from the optical disc through the objective lens, and convert the reflected first light beam into an electrical signal; the processing circuit is used to obtain a first driving signal according to the electrical signal; the driving motor is used to drive the OPU to move along the guide rail according to the first driving signal.

4. The optical drive according to claim 3, wherein: the OPU motor is used to drive the objective lens to perform linear reciprocating movement along the radial direction of the optical disc according to a second driving signal; the processing circuit is further used to obtain a third driving signal according to the second driving signal and the electrical signal; the driving motor is further used to drive the OPU to move along the guide rail according to the third driving signal.

5. The optical drive according to any one of claims 1 to 4, characterized in that, the driving motor comprises a stator and a rotor, the rotor is fixed with the OPU, and the stator is relatively fixed with the guide rail; the driving motor is used to drive the OPU to move along the guide rail, and the driving motor is used to drive the rotor and the OPU to move along the guide rail.

6. The optical drive of claim 5, wherein, the stator is a permanent magnet, and the rotor is a coil.

7. The optical drive of claim 6, wherein, the number of the stators is 2, and the stators are arranged in parallel with the guide rail.

8. A data processing device, characterized by a processor and the optical drive according to any one of claims 1 to 7, wherein the processor is used to transmit data to the optical drive and / or receive data from the optical drive.

9. A data reading or storing method characterized by, comprises: a rotating optical disc; an optical pickup unit (OPU) is driven by a driving motor to move along a guide rail to read data stored on the optical disc or store data on the optical disc, and the movement track of the OPU is a combined movement of one-way linear movement and sinusoidal movement; the OPU comprises an objective lens, and the objective lens performs linear reciprocating movement along the radial direction of the optical disc.

10. The data reading or storing method according to claim 9, wherein, the method further comprises: an objective lens in the OPU is driven by an OPU motor to perform linear reciprocating movement along the radial direction of the optical disc, and the movement range of the linear reciprocating movement is less than or equal to 10 microns.

11. The data reading or storing method according to claim 10, wherein, the method further comprises: generating a first light beam, and directing the first light beam to the optical disc through the objective lens; receiving the first light beam reflected from the optical disc, and converting the reflected first light beam into an electrical signal; obtaining a first driving signal according to the electrical signal; driving the optical pickup unit (OPU) to move along the guide rail by the driving motor, including driving the driving motor by the first driving signal to drive the OPU to move along the guide rail by the driving motor.

12. The data reading or storing method of claim 11, wherein: driving the objective lens in the OPU to move linearly along the radial direction of the optical disc by the OPU motor, including driving the OPU motor by a second driving signal to drive the objective lens in the OPU to move linearly along the radial direction of the optical disc by the OPU motor; the method further comprises: obtaining a third driving signal according to the second driving signal and the electrical signal; driving the driving motor by the third driving signal to drive the OPU to move along the guide rail by the driving motor.

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