Optical disc drive and data processing device

Abstract

The present application provides an optical disc drive, applicable to the field of optical storage. The optical disc drive comprises an optical pick-up unit (OPU), a driving motor, guide rails, and a spindle motor. The spindle motor is used for bearing and rotating an optical disc. The driving motor is used for driving the OPU to move along the guide rails, so as to pick up data stored on the optical disc or store data into the optical disc. The motion trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion. According to the technical solution provided by the present application, the repeated sinusoidal motion is applied to the driving motor, such that a motion range of an objective lens can be narrowed, thereby reducing changes in the distance between two light spots caused by the motion of the objective lens, and thus improving the reliability of data storage or pick-up.

Description

Optical drives and data processing equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on July 31, 2023, with application number 202310959962.9 and invention name “Optical Drive and Data Processing Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of optical storage, and in particular to optical drives and data processing equipment. Background Art

[0003] In Blu-ray multi-layer storage solutions, to increase the storage capacity of an optical disc, 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 light beams. The red light spot and the blue light spot maintain a fixed distance. The red light is focused and tracks on the wobble layer. The blue light is focused on the data layer. The blue light tracks and follows the red light. In actual applications, the center of the wobble track is not concentric with the rotation center of the optical disc; there is an eccentric distance between the two. Therefore, in order for 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, so that the objective lens moves radially along the optical disc. For each rotation of the optical disc, the movement trajectory of the objective lens forms a periodic sine wave. Therefore, the motion trajectory of the objective lens includes repeated sinusoidal motion.

[0004] Changing the position of the objective lens affects the distance between the two light spots. Furthermore, this distance is affected by the eccentricity. Therefore, each time the disc is repositioned, the distance between the two light spots may vary, affecting data storage or reading.

[0005] Summary of the Invention

[0006] The present application provides an optical drive and a data processing device, which can reduce the movement range of the objective lens by applying repeated sinusoidal motion to the drive motor, thereby reducing the distance change between the two light spots caused by the movement of the objective lens, thereby improving the reliability of data storage or reading.

[0007] In a first aspect, the present application provides an optical drive. The drive comprises an optical play unit (OPU), a drive motor, guide rails, and a spindle motor. The spindle motor is used to carry and rotate an optical disc. The drive motor is used to drive the OPU along the guide rails to read data stored on the optical disc or to store data on the optical disc. The OPU's motion trajectory is a composite of unidirectional linear motion and sinusoidal motion.

[0008] In an optional embodiment of the first aspect, the OPU includes an OPU motor and an objective lens. The OPU motor is configured to cause the objective lens to perform linear reciprocating motion along the radial direction of the optical disc. The range of the linear reciprocating motion is less than or equal to 10 microns. By limiting the range of the linear reciprocating motion, the distance variation between the two light spots can be further reduced, thereby improving the reliability of data storage or reading.

[0009] In an optional embodiment of the first aspect, the optical drive further includes a processing circuit. The OPU further includes a laser and a light detector. The laser is used to generate a first light beam, which is incident on the optical disc through an 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 drive signal based on the electrical signal. The drive motor is used to drive the OPU along the guide rail based on the first drive signal. Obtaining the drive signal for the drive motor through the electrical signal can improve the similarity between the actual deviation caused by sinusoidal motion and non-concentricity in the composite motion, thereby improving the reliability of data storage or reading.

[0010] In an optional embodiment of the first aspect, the OPU motor is configured to cause the objective lens to perform linear reciprocating motion along the radial direction of the optical disc in response to a second drive signal. The processing circuit is further configured to obtain a third drive signal based on the second drive signal and the electrical signal. The drive motor is further configured to drive the OPU along the guide rail in response 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 motion range of the objective lens can be further reduced, thereby improving the reliability of data storage or reading.

[0011] In an optional embodiment of the first aspect, the drive motor includes a stator and a mover. The mover and the OPU are fixed. The positions of the stator and the guide rail are relatively fixed. The drive motor is used to drive the mover and the OPU to move along the guide rail.

[0012] In an optional manner of the first aspect, the stator is a permanent magnet, and the mover is a coil.

[0013] In an optional embodiment of the first aspect, the number of stator pairs is 2, and the stators and guide rails are arranged in parallel. By increasing the number of stator pairs, the stability of the OPU during the synthetic motion process can be improved, thereby improving the reliability of data storage or reading.

[0014] A second aspect of the present application provides a data processing device. The data processing device includes a processor and the optical drive described in the first aspect or any optional embodiment of the first aspect. The processor is configured to transmit data to the optical drive and / or receive data from the optical drive. When the processor is configured to transmit data to the optical drive, the optical drive is configured to store the data on an optical disc. When the processor is configured to receive data from the optical drive, the optical drive is configured to read data stored on the optical disc.

[0015] A third aspect of the present application provides a data reading or storage method. The data reading or storage method can be applied to a data processing device or an optical drive. The data reading or storage method is described below using 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 the optical disc; the data processing device drives the OPU along a guide rail via a drive motor to read data stored on the optical disc or store data on the optical disc. The motion trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion.

[0016] In an optional embodiment of the third aspect, the data reading or storing method further includes the following steps: the data processing device drives the objective lens in the OPU via the OPU motor to perform linear reciprocating motion along the radial direction of the optical disc. The linear reciprocating motion has a range of motion less than or equal to 10 microns.

[0017] In an optional embodiment of the third aspect, the data reading or storing method further includes the following steps: a data processing device generates a first light beam and directs the first light beam toward the 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; and the data processing device obtains a first drive signal based on the electrical signal. The data processing device drives a drive motor using the first drive signal, so that the drive motor drives the OPU along the guide rail.

[0018] In an optional embodiment of the third aspect, the data processing device drives the OPU motor using the second drive signal, so that the OPU motor drives the objective lens in the OPU to perform linear reciprocating motion along the radial direction of the optical disc. The data reading or storage method further includes the following steps: the data processing device generates a third drive signal based on the second drive signal and the electrical signal. The data processing device drives the drive motor using the third drive signal, so that the drive motor drives the OPU along the guide rail.

[0019] A fourth aspect of the present application provides a drive motor. The drive motor includes a stator and a mover. The mover is fixed to the OPU. The drive motor is configured to drive the mover and the OPU along a guide rail. The positions of the stator and the guide rail are relatively fixed.

[0020] In an optional manner of the fourth aspect, the stator is a permanent magnet and the mover is a coil.

[0021] In an optional manner of the fourth aspect, the number of stator pairs is 2, and the stator and the guide rail are arranged in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1a is a front view of an optical drive provided in an embodiment of the present application;

[0023] FIG1 b is a first side view of the optical drive provided in an embodiment of the present application;

[0024] FIG1c is a schematic diagram of a red light tracking closed loop system according to an embodiment of the present application;

[0025] FIG2 is a schematic diagram of the structure of the OPU provided in an embodiment of the present application;

[0026] FIG3 is a schematic diagram of a curve of unidirectional linear motion and sinusoidal motion provided by an embodiment of the present application;

[0027] FIG4 is a schematic diagram of a curve of a composite motion and a linear reciprocating motion provided by an embodiment of the present application;

[0028] FIG5 is a schematic diagram of the trajectory of red light provided in an embodiment of the present application;

[0029] FIG6 a is a second side view of the optical drive provided in the embodiment of the present application;

[0030] FIG6 b is a third side view of the optical drive provided in the embodiment of the present application;

[0031] FIG6 c is a fourth side view of the optical drive provided in the embodiment of the present application;

[0032] FIG6 d is a fifth side view of the optical drive provided in the embodiment of the present application;

[0033] FIG7 is a schematic diagram of the structure of a data processing device provided in an embodiment of the present application;

[0034] FIG8 is a flow chart of a data reading or storage method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] The present application provides an optical drive and data processing device that, by applying repetitive sinusoidal motion to a drive motor, can reduce the range of motion of the objective lens, thereby reducing the distance change between the two light spots caused by the movement of the objective lens, thereby improving the reliability of data storage or reading. It should be understood that the terms "first," "second," etc. used in this application are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance, nor as indicating or implying an order. In addition, for the sake of simplicity and clarity, reference numbers and / or letters are repeated in multiple figures of this application. Repetition does not indicate a strict limit relationship between the various embodiments and / or configurations.

[0036] The optical drive provided in this application is used in the field of optical storage. In a Blu-ray multi-layer storage solution in the optical storage field, to increase the storage capacity of an optical disc, multiple data tracks in a data layer can share the swing track of a swing layer. The optical drive generates a dual light beam. 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 the red light. However, when the position of the objective lens in the optical drive changes, the distance between the two light spots is affected, thereby affecting the storage or reading of data.

[0037] To this end, the present application provides an optical drive. Figure 1a is a front view of the optical drive provided in an embodiment of the present application. Figure 1b is a first side view of the optical drive provided in an embodiment of the present application. As shown in Figures 1a and 1b, 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). Among them, the spindle motor is used to carry and rotate the optical disc 7. The drive motor is also called a sled motor or a first motor. The drive motor is used to drive the OPU 3 to move along the guide rail 4. In the example of Figure 1a, the OPU 3 and the coil 2 are connected by a rigid connector 6. When the coil 2 is energized, the coil 2 drives the OPU 3 to move along the guide rail 4. The movement direction of the OPU 3 is the radial direction of the optical disc (the positive direction of the Y axis or the negative direction of the Y axis in the figure). The motion trajectory of the OPU 3 is a composite motion of unidirectional linear motion and sinusoidal motion. When the OPU 3 moves along the guide rail 4, the OPU 3 is used to read data stored on the optical disc 7 or store data on the optical disc 7. The optical disc 7 is also called an optical disc, an optical disk or an optical disc.

[0038] In Figures 1a and 1b, the OPU 3 includes an objective lens 5 and an OPU motor. The OPU motor is used to change the position of the objective lens 5. Specifically, the optical disc 7 includes a swing track of the swing layer and a data track of the data layer. The red light generated by the 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 the red light. In theory, through the above-mentioned synthetic movement of the OPU 3, the red light can be focused and tracked on the swing track. However, due to the influence of the processing accuracy, 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 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 1c is a system schematic diagram of the red light tracking closed loop provided in an embodiment of the present application. As shown in Figure 1c, the optical drive obtains the actual position and target position of the red light spot in real time, and generates a drive signal based on the actual position and target position. The OPU motor is used to adjust the position of the objective lens 5 according to the drive signal. The drive motor is used to change the position of OPU 3 based on the drive signal generated by the synthetic motion. This change in OPU 3 position changes the position of objective lens 5, thereby affecting the position of objective lens 5. After the position of objective lens 5 is changed by the OPU motor and the drive motor, the optical drive again obtains the actual position and target position of the red light spot, and the above steps are repeated.

[0039] In practical applications, the range of motion of the objective lens 5 is positively correlated with the change in the distance between the two light spots. That is, the larger the range of motion of the objective lens 5, the greater the change in the distance between the two light spots. In the embodiments of the present application, by applying repeated sinusoidal motion to the drive motor, the range of motion of the objective lens 5 can be reduced, thereby reducing the change in the distance between the two light spots caused by the movement of the objective lens 5, thereby improving the reliability of data storage or reading.

[0040] In practical applications, the objective lens 5 is also called a focusing lens. The objective lens 5 is used to irradiate the red light beam and the blue light beam onto the optical disc 7. The objective lens 5 can also be used to reduce or eliminate spherical aberration. The structure of the OPU is described below by way of example. Figure 2 is a schematic diagram of the structure of the OPU provided in an embodiment of the present application. As shown in Figure 2, the 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 is used to generate red light (dotted line) and transmit the red light to the first collimating lens 209. The first collimating lens 209 is used to collimate the red light, so that the red light becomes parallel light and eliminates the chromatic aberration of the red light. The first collimating lens 209 is also used to transmit the red light to the objective lens 5 through the intermediate lens group 202. The objective lens 5 is used to eliminate spherical aberration in optical aberrations, transmit red light to the optical disc 7, and receive the reflected beam of red light from the optical disc 7. The objective lens 5 is also used to transmit a reflected red light beam to the first detector 208 via the intermediate lens group 202. The first detector 208 is used to convert the reflected red light beam into a first electrical signal. This first electrical signal can be used to determine the actual position of the red light on the optical disc 7. Similarly, the second laser 207 is used to generate blue light (dashed line) and transmit the blue light to the second collimating lens 206. The second collimating lens 206 is used to transmit the blue light to the objective lens 5 via the intermediate lens group 202. The objective lens 5 is used to transmit the blue light to the optical disc 7. The blue light can be used to store or read data on the optical disc 7. When the blue light is used to read data from the optical disc 7, the objective lens 5 is also used to receive the reflected blue light beam from the optical disc 7 and transmit it to the second detector 211 via the intermediate lens group 202. The second detector 211 is used to convert the reflected blue light beam into a second electrical signal. The second electrical signal represents the data stored on the optical disc 7. The OPU motor 201 is used to drive the objective lens 5 to perform linear reciprocating motion along the radial direction of the optical disc 7. The intermediate lens assembly 202 includes a dichroic mirror 203, a first beamsplitter 204, and a second beamsplitter 205. The first beamsplitter 204 is used to separate the red light from the reflected red light beam. The second beamsplitter 205 is used to separate the blue light from the reflected blue light beam. The dichroic mirror 203 combines the red and blue light beams in the transmission direction of the light beams. In the transmission direction of the reflected light beams, the dichroic mirror 203 separates the reflected red and blue light beams.

[0041] As shown in Figures 1a and 1b, the motion trajectory of OPU 3 is a composite of linear and sinusoidal motion. Figure 3 is a schematic diagram of unidirectional linear motion and sinusoidal motion curves provided in an embodiment of the present application. As shown in Figure 3, the abscissa represents time, and the ordinate represents distance traveled. Curve 301 of the composite motion is the superposition of curve 302 of sinusoidal motion and curve 303 of unidirectional linear motion. On optical disc 7, the wobble track and data track form a spiral line running from the inside out. Therefore, when the optical drive reads data from optical disc 7, the drive motor must drive OPU 3 in unidirectional linear motion from the inside out along the disc. Furthermore, the center of the wobble track and the rotation center of optical disc 7 are not concentric; there is an eccentric distance between them. Therefore, in order for the red light to follow the wobble track, the drive motor must change the position of OPU 3, causing it to move radially along optical disc 7. With each rotation of optical disc 7, the motion trajectory of OPU 3 forms a periodic sine wave. Therefore, the motion trajectory of OPU 3 includes repeated sinusoidal motion. In summary, the motion trajectory of OPU 3 is a composite motion of unidirectional linear motion and sinusoidal motion.

[0042] In the example of FIG3 , the sinusoidal motion curve 302 is a single-frequency sinusoidal curve. It should be understood that the sinusoidal motion curve 302 provided in FIG3 is merely an example provided in the embodiments of the present application. In actual applications, the repeated sinusoidal motion curve can be a multiple-frequency sinusoidal curve. Among multiple-frequency sinusoidal curves, a single-frequency sinusoidal curve has the largest amplitude.

[0043] According to the description in Figures 1a and 1b, in addition to the above-mentioned synthetic motion, the optical drive also needs to turn on 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 is a schematic diagram of the synthetic motion and linear reciprocating motion provided in an embodiment of the present application. Among them, the motion generated by the objective lens 5 through the red light tracking closed loop is called linear reciprocating motion. The linear reciprocating motion of the objective lens 5 and the synthetic motion of the OPU 3 will change the position of the objective lens 5 or the red light irradiated to the optical disc 7. Therefore, as shown in Figure 4, the horizontal axis represents time and the vertical axis represents the distance moved. The motion curve 401 of the objective lens 5 or the red light spot is equal to the superposition of the curve 301 of the synthetic motion and the curve 402 of the linear reciprocating motion.

[0044] In practical applications, the amplitude of curve 302 depends on the deviation between the center of the wobble track and the rotational center of optical disk 7. The greater the deviation, the greater the amplitude of curve 302. Generally, the amplitude of curve 302 can reach 100 microns. In the embodiments of the present application, by applying repetitive sinusoidal motion to the drive motor, the range of linear reciprocating motion can be reduced. For example, the range of linear reciprocating motion can be less than or equal to 10 microns.

[0045] In actual applications, the drive motor is used to drive the OPU 3 to move along the guide rail 4 according to the first drive signal. According to the description of Figure 3, the synthetic motion obtained by the first drive signal can be decomposed into unidirectional linear motion and sinusoidal motion. The rate of unidirectional linear motion is related to the rotation 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 rate of unidirectional linear motion is related to the rotation speed and radial position of the optical disc 7. The radial position refers to the distance between the light spot and the center of the circle of the optical disc 7. Sinusoidal motion can be obtained based on the deviation between the center of the swing track and the center of rotation of the optical disc 7. This application does not limit the way of obtaining the deviation. For example, the optical drive also includes an eccentricity measuring device, and the deviation between the two is measured by the eccentricity measuring device. In order to reduce the hardware cost of the optical drive, the optical drive can obtain the deviation through the OPU 3. This is described below.

[0046] OPU 3 includes a laser (e.g., first laser 210 in Figure 2) and a photodetector (e.g., first detector 208 in Figure 2). The laser is used to generate a first light beam, which is incident on optical disc 7 through objective lens 5. Under the premise that the first light beam is in stable focus and the red light tracking is in open loop, the photodetector is used to receive the first light beam reflected from optical disc 7 through objective lens 5 and convert the reflected first light beam into an electrical signal. The electrical signal carries information related to the deviation. Figure 5 is a schematic diagram of the red light trajectory according to an embodiment of the present application. As shown in Figure 5, the abscissa represents time, and the ordinate represents position. Under the premise that the red light tracking is in open loop, only the unidirectional linear motion of the drive motor is enabled. During each rotation of optical disc 7, the red light trajectory alternately intersects with the data layer track and the wobble layer track. At time 0, the red light trajectory intersects with the wobble layer track (i.e., the red light spot is located on the wobble track). After the optical disc 7 rotates one full rotation (when the abscissa is 0.025 in Figure 5), the red light trajectory intersects with the wobble layer track again. The position of the red light spot represents information related to the deviation. The optical drive also includes a processing circuit. The processing circuit is configured to obtain a trajectory of the sinusoidal motion based on the electrical signal. For example, the processing circuit is configured to obtain a first repetitive error RRO1 according to the following formula.

[0047] Among them, TES(k,j) includes N*j values. RRO1 includes j values. The j values ​​correspond one-to-one to the j sectors of the optical disc. Each of the j values ​​represents the position where the first light beam is irradiated on the optical disc. N represents the number of revolutions 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 rate of 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 obtain the first drive signal based on the trajectory of the composite motion. The drive motor is used to drive the OPU 3 to move along the guide rail 4 according to the first drive signal.

[0048] After the drive motor drives 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 point, the optical drive can receive the reflected red light beam through the first detector and convert it into a first electrical signal. The optical drive is also configured to determine the actual position of the red light spot based on the first electrical signal and to derive a second drive signal based on the actual position and the target position. The OPU motor is configured 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.

[0049] In practical applications, the second drive signal carries information about the trajectory of the linear reciprocating motion. The processing circuit can be configured to extract the low-frequency sinusoidal motion trajectory from the linear reciprocating motion trajectory information and superimpose the low-frequency sinusoidal motion trajectory with the sinusoidal motion trajectory obtained from the electrical signal to obtain a new sinusoidal motion trajectory. For example, under a closed red light tracking loop, after the optical disc 7 rotates one revolution, the processing circuit is configured to collect the second drive signal during this revolution. The processing circuit is configured to convert the second drive signal into TES(k, j). The processing circuit is configured to perform a Fourier transform on TES(k, j) to obtain a frequency-domain electrical signal. The processing circuit is configured to extract the low-frequency electrical signal from the frequency-domain electrical signal. The processing circuit is also configured to perform an inverse Fourier transform on the low-frequency electrical signal to obtain a second repetitive error. The processing circuit is configured to superimpose the second repetitive error with the first repetitive error to obtain a third repetitive error. The third repetitive error corresponds to the new sinusoidal motion trajectory. The processing circuit is configured to derive a composite motion trajectory based on the new sinusoidal motion trajectory and the unidirectional linear motion trajectory, and to derive 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.

[0050] In an embodiment of the present application, the drive motor includes a stator and a mover. The mover and the OPU 3 are fixed. The positions of the stator and the guide rail are relatively fixed. The drive motor is used to drive the mover and the OPU 3 along the guide rail 4. In the examples of Figures 1a and 1b, the stator is a permanent magnet and the mover is a coil. In actual 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.

[0051] In the example of Figures 1a and 1b, to improve the stability of OPU 3 during synthetic motion, the number of stator pairs is two. Specifically, the drive motor includes two pairs of stators, each pair consisting of one north-pole permanent magnet and one south-pole permanent magnet. The stators and guide rails 4 are arranged in parallel. It should be understood that in actual applications, those skilled in the art may increase or decrease the number of stators as needed.

[0052] In the example of Figure 1b, OPU 3 is inside coil 2. In actual applications, OPU 3 can also be outside coil 2. When OPU 3 is outside coil 2, coil 2 includes two parts of the coil. The two parts of the coil can be connected in parallel or in series. Figure 6a is a second side view of the optical drive provided by an embodiment of the present application. As shown in Figure 6a, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in series. Each of the two coils surrounds an S-pole permanent magnet. The outer circle of coil 602 is connected to the inner circle of coil 601. Figure 6b is a third side view of the optical drive provided by an embodiment of the present application. As shown in Figure 6b, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in series. Coil 601 surrounds an S-pole permanent magnet. Coil 602 surrounds an N-pole permanent magnet. The outer circle of coil 602 is connected to the outer circle of coil 601. Figure 6c is a fourth side view of the optical drive provided by an embodiment of the present application. As shown in Figure 6c, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in parallel. Each of the two coils surrounds an S-pole permanent magnet. The outer circle of coil 602 and the inner circle of coil 601 are connected in parallel. Figure 6d is the fifth side view of the optical drive provided by an embodiment of the present application. As shown in Figure 6d, coil 2 includes coil 601 and coil 602. Coil 601 and coil 602 are connected in parallel. Coil 601 surrounds an S-pole permanent magnet. Coil 602 surrounds an N-pole permanent magnet. The outer circle of coil 602 and the outer circle of coil 601 are connected in parallel.

[0053] The optical drive provided in this application is described above. The data processing device and data reading or storage method provided in this application are described below. Figure 7 is a schematic diagram of the structure of the data processing device provided in an embodiment of the present application. As shown in Figure 7, 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 can further include a hardware chip or other general-purpose processor. The above-mentioned 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 the optical drive 701 and / or receive data from the optical drive 701. The optical drive 701 is used to read data from an optical disc and / or store data on the optical disc. When the processor 702 is used to transmit data to the optical drive 701, the optical drive 701 is used to store data on the optical disc. When the processor 702 is used to receive data from the optical drive, the optical drive 701 is used to read data stored on the optical disc. It should be understood that the description of the optical drive 701 can refer to the description of any of the aforementioned Figures 1a to 6d.

[0054] In other embodiments, the data processing device 700 may further include a memory. The memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), or a flash memory. The volatile memory may be a 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.

[0055] FIG8 is a schematic flow chart of a data reading or storage method provided in an embodiment of the present application. The data reading or storage method can be applied to a data processing device or an optical drive. The data reading or storage method will be described below using its application to a data processing device as an example. As shown in FIG8 , the data reading or storage method includes the following steps.

[0056] In step 801, a data processing device rotates an optical disc.

[0057] Data processing equipment uses a spindle motor to carry and rotate optical discs. Optical discs are also called optical discs, optical disks, or optical disks. Data processing equipment can rotate optical discs at a constant linear speed, a constant angle, or at a constant linear speed in different zones.

[0058] In step 802, the data processing device drives the OPU to move along the guide rail through the driving 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 movement of unidirectional linear motion and sinusoidal motion.

[0059] The data reading or storage method also includes the following steps: a data processing device generates red light and blue light. The red light is focused and tracks the swing track of the swing layer. The red light spot and the blue light spot maintain a fixed distance. The blue light tracks the red light. The data processing device drives the objective lens in the OPU through the OPU motor to perform a straight reciprocating motion along the radial direction of the optical disc, so that the red light tracks the swing track. When the position of the objective lens changes, the distance between the red light spot and the blue light spot will change. Among them, the size of the movement range of the objective lens is positively correlated with the change in the distance between the two light spots, that is, the larger the movement range of the objective lens, the greater the change in the distance between the two light spots. In an embodiment of the present application, by applying repeated sinusoidal motion to the drive motor, the movement range of the objective lens can be reduced, thereby reducing the change in the distance between the two light spots caused by the movement of the objective lens, thereby improving the reliability of data storage or reading.

[0060] It should be understood that there are similarities between the description of the data reading or storage method and the description of the optical drive in any of the aforementioned Figures 1a to 6d. Therefore, the description of the data reading or storage method in Figure 8 can refer to the description of the optical drive in any of the aforementioned Figures 1a to 6d. For example, the motion range of the linear reciprocating motion is less than or equal to 10 microns. For another example, the data processing device receives a 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 the drive motor through the first drive signal, so that the drive motor drives the OPU along the guide rail.

[0061] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the protection scope of the present application.

Claims

1. An optical drive, characterized in that: It includes an optical reading unit OPU, a drive motor, a guide rail and a spindle motor, wherein: The spindle motor is used to carry and rotate the optical disc; The driving motor is used to drive the OPU to move along the guide rail to read data stored on the optical disk or store data on the optical disk. The movement trajectory of the OPU is a composite movement of unidirectional linear motion and sinusoidal motion.

2. The optical drive according to claim 1, characterized in that: The OPU includes an OPU motor and an objective lens; The OPU motor is used to drive the objective lens to perform linear reciprocating motion along the radial direction of the optical disc, and the movement range of the linear reciprocating motion is less than or equal to 10 microns.

3. The optical drive according to claim 2, characterized in that: The optical drive further includes a processing circuit, and the OPU further includes 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, including: 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, characterized in that: The OPU motor is used to drive the objective lens to perform linear reciprocating motion along the radial direction of the optical disc, including: the OPU motor is used to drive the objective lens to perform the linear reciprocating motion along the radial direction of the optical disc according to the 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 also 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 includes a stator and a mover, the mover and the OPU are fixed, and the positions of the stator and the guide rail are relatively fixed; The driving motor is used to drive the OPU to move along the guide rail, including: the driving motor is used to drive the mover and the OPU to move along the guide rail.

6. The optical drive according to claim 5, characterized in that: The stator is a permanent magnet, and the mover is a coil.

7. The optical drive according to claim 6, characterized in that: The number of pairs of the stators is 2, and the stators and the guide rails are arranged in parallel.

8. A data processing device, characterized in that: The optical drive comprises a processor and 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 method for reading or storing data, characterized in that: include: Rotating optical disc; The optical reading unit OPU is driven by a driving motor to move along the guide rail to read data stored on the optical disc or store data on the optical disc. The movement trajectory of the OPU is a composite movement of unidirectional linear motion and sinusoidal motion.

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

11. The data reading or storing method according to claim 10, characterized in that: The method further comprises: Generate a first light beam, and direct the first light beam toward 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 reading unit OPU to move along the guide rail by a driving motor includes: driving the driving motor by the first driving signal, so that the driving motor drives the OPU to move along the guide rail.

12. The data reading or storing method according to claim 11, characterized in that: The step of driving the objective lens in the OPU to perform linear reciprocating motion along the radial direction of the optical disc by the OPU motor comprises: driving the OPU motor by a second driving signal so that the OPU motor drives the objective lens in the OPU to perform linear reciprocating motion along the radial direction of the optical disc. sports; The method further comprises: Obtaining a third driving signal according to the second driving signal and the electrical signal; The driving motor is driven by the third driving signal so that the driving motor drives the OPU to move along the guide rail.

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