CD driver and data processing equipment

Abstract

The invention provides a CD driver which is applied to the field of optical storage. The CD driver comprises an optical reading unit (OPU), a driving motor, a guide rail and a spindle motor. The spindle motor is used for bearing and rotating the optical disc. And the driving motor is used for driving the OPU to move along the guide rail so as to read data stored on the optical disc or store data on the optical disc. The motion trail of the OPU is the resultant motion of one-way linear motion and sinusoidal motion. In the technical scheme provided by the invention, the motion interval of the objective lens can be reduced by applying the repeated sinusoidal motion to the driving motor, so that the change of the distance between the two light spots caused by the motion of the objective lens is reduced, and the reliability of data storage or reading is improved.

Description

Technical Field

[0001] The present application relates to the field of optical storage, and in particular to optical drives and data processing equipment. Background Art

[0002] In a Blu-ray multi-layer storage solution, in order to increase the storage capacity of an optical disc, multiple data tracks in a data layer can share a wobble track of a wobble layer. The wobble layer is also called a wobble layer. The wobble track is also called a wobble track. The optical drive generates a double beam. 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 practical applications, the center of the wobble track is not concentric with the rotation center of the optical disc, and there is an eccentric distance between the two. Therefore, in order to allow the red light to follow the wobble track, it is necessary to change the position of the objective lens in the optical pick-up unit (OPU) motor through the OPU so that the objective lens moves radially along the optical disc. For each rotation of the optical disc, the moving trajectory of the objective lens forms a periodic sine wave. Therefore, the motion trajectory of the objective lens includes repeated sinusoidal motions.

[0003] When the position of the objective lens changes, the distance between the two light spots will be affected. And this distance is affected by the eccentricity. Therefore, every time the optical disc is repositioned, the distance between the two light spots may be different, thus affecting the storage or reading of data. Summary of the invention

[0004] The present application provides an optical drive and a data processing device, which can reduce the movement range of an objective lens by applying repeated sinusoidal motion to a drive motor, thereby reducing the distance change between two light spots caused by the movement of the objective lens, thereby improving the reliability of data storage or reading.

[0005] In a first aspect, the present application provides an optical drive. The optical drive includes an OPU, a drive motor, a guide rail, and a spindle motor. The spindle motor is used to carry and rotate the optical disc. The drive 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. The motion trajectory of the OPU is a composite motion of a unidirectional linear motion and a sinusoidal motion.

[0006] In an optional manner of the first aspect, 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. The motion range of the linear reciprocating motion is less than or equal to 10 microns. By limiting the motion range of the linear reciprocating motion, the distance change between the two light spots can be further reduced, thereby improving the reliability of data storage or reading.

[0007] In an optional manner of the first aspect, the optical drive further includes a processing circuit. The OPU further includes a laser and a photodetector. The laser is used to generate a first light beam, and the first light beam is incident on the optical disc through an objective lens. The photodetector 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 to move along the guide rail based on the first drive signal. Obtaining the drive signal of the drive motor through the electrical signal can improve the similarity of the actual deviation caused by the sinusoidal motion and the non-concentricity in the synthetic motion, thereby improving the reliability of data storage or reading.

[0008] In an optional manner 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 the second drive signal. The processing circuit is also used to obtain a third drive signal according to the second drive signal and the electrical signal. The drive motor is also used to drive the OPU to move along the guide rail according to the third drive signal. The second drive signal may also contain a motion trajectory that can be converted into a sinusoidal motion. By transferring this part 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.

[0009] In an optional manner 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.

[0010] In an optional manner of the first aspect, the stator is a permanent magnet and the mover is a coil.

[0011] In an optional manner of the first aspect, the number of stator pairs is 2, and the stator and the guide rail 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.

[0012] The 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 manner of the first aspect. The processor is used to transmit data to the optical drive and / or receive data from the optical drive. When the processor is used to transmit data to the optical drive, the optical drive is used to store data on an optical disc. When the processor is used to receive data from the optical drive, the optical drive is used to read data stored on the optical disc.

[0013] The 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 by taking 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 to move along the guide rail through a driving motor to read the data stored on the optical disc or store data on the optical disc. Among them, the motion trajectory of the OPU is a composite motion of unidirectional linear motion and sinusoidal motion.

[0014] In an optional manner of the third aspect, the data reading or storing method further comprises the following steps: the data processing device drives the objective lens in the OPU to perform linear reciprocating motion along the radial direction of the optical disc through the OPU motor, and the motion range of the linear reciprocating motion is less than or equal to 10 microns.

[0015] In an optional manner 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 incidents the first light beam onto 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; the data processing device obtains a first driving signal according to the electrical signal. The data processing device drives the driving motor through the first driving signal, so that the driving motor drives the OPU along the guide rail.

[0016] In an optional manner of the third aspect, the data processing device drives the OPU motor through 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 also includes the following steps: the data processing device obtains a third drive signal according to the second drive signal and the electrical signal. The data processing device drives the drive motor through the third drive signal, so that the drive motor drives the OPU to move along the guide rail.

[0017] In a fourth aspect, the present application provides a driving motor. The driving motor includes a stator and a mover. The mover is used to be fixed to the OPU. The driving motor is used to drive the mover and the OPU to move along the guide rail. The positions of the stator and the guide rail are relatively fixed.

[0018] In an optional manner of the fourth aspect, the stator is a permanent magnet and the mover is a coil.

[0019] 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

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

[0021] Figure 1b A first side view of the optical drive provided in an embodiment of the present application;

[0022] Figure 1c A schematic diagram of a red light tracking closed loop system provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of the OPU provided in the embodiment of the present application;

[0024] Figure 3 A schematic diagram of a curve of unidirectional linear motion and sinusoidal motion provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of a curve of a composite motion and a linear reciprocating motion provided in an embodiment of the present application;

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

[0027] Figure 6a A second side view of the optical drive provided by the embodiment of the present application;

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

[0029] Figure 6c A fourth side view of the optical drive provided by the embodiment of the present application;

[0030] Figure 6d A fifth side view of the optical drive provided by the embodiment of the present application;

[0031] Figure 7 A schematic diagram of the structure of a data processing device provided in an embodiment of the present application;

[0032] Figure 8 A flowchart of a data reading or storage method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The present application provides an optical drive and a data processing device, which can reduce the movement interval 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. It should be understood that the "first", "second", etc. used in the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, for the sake of simplicity and clarity, reference numbers and / or letters are repeated in multiple figures of the present application. Repetition does not indicate a strict limiting relationship between various embodiments and / or configurations.

[0034] The optical drive provided by the present application is applied to the field of optical storage. In the blue-ray multi-layer storage solution in the field of optical storage, in order 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 a double light beam. The light spot of the red light and the light spot of the blue light 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 will affect the distance between the two light spots, thereby affecting the storage or reading of data.

[0035] To this end, the present application provides an optical drive. Figure 1a This is a front view of the optical drive provided in an embodiment of the present application. Figure 1b This is a first side view of the optical drive provided in the embodiment of the present 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 a first motor. The drive motor is used to drive the OPU 3 to move along the guide rail 4. Figure 1a In the example, 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 movement trajectory of the OPU 3 is a composite motion of a unidirectional linear motion and a sinusoidal motion. During the movement of the OPU 3 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 disc or an optical disc.

[0036] exist Figure 1a and Figure 1b In the embodiment, 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 a swing layer and a data track of a 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. In theory, through the synthetic movement of the above-mentioned 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 open the red light tracking closed loop and change the position of the objective lens 5 in OPU 3 through the OPU motor so that the red light can follow the swing track. Figure 1c This is a schematic diagram of the red light tracking closed loop system provided in the embodiment of the present application. Figure 1cAs shown, the optical drive obtains the actual position and target position of the red light spot in real time, and generates a driving signal according to the actual position and the target position. The OPU motor is used to adjust the position of the objective lens 5 according to the driving signal. The driving motor is used to change the position of the OPU 3 according to the driving signal obtained by the synthetic motion. The position change of the OPU 3 will change the position of the objective lens 5, thereby affecting the position of the objective lens 5. After the position of the objective lens 5 is changed by the OPU motor and the driving motor, the optical drive obtains the actual position and target position of the red light spot again, and the above steps are repeated.

[0037] In practical applications, the movement interval of the objective lens 5 is positively correlated with the change in the distance between the two light spots, that is, the larger the movement interval of the objective lens 5, the larger the change in the distance between the two light spots. In the embodiment of the present application, by applying repeated sinusoidal motion to the drive motor, the movement interval 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.

[0038] In practical applications, the objective lens 5 is also called a focusing lens, and 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 This is a schematic diagram of the structure of the OPU provided in the embodiment of the present 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 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 the spherical aberration in the optical aberration, transmit the red light to the optical disc 7, and receive the reflected light beam of the red light from the optical disc 7. The objective lens 5 is also used to transmit the reflected light beam of the red light to the first detector 208 through the intermediate lens group 202. The first detector 208 is used to convert the reflected light beam of the red light into a first electrical signal. The first electrical signal can be used to determine the actual position of the red light irradiated to 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 through 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 on the optical disc 7, the objective lens 5 is also used to receive the reflected light beam of the blue light from the optical disc 7, and transmit the reflected light beam of the blue light to the second detector 211 through the intermediate lens group 202. The second detector 211 is used to convert the reflected light beam of the blue light into a second electrical signal. The second electrical signal is the data stored on the optical disc 7. The OPU motor 201 is used to drive the objective lens 5 to perform a 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 is used to separate the red light and the reflected light beam of the red light. The second beam splitter 205 is used to separate the blue light and the reflected light beam of the blue light. In the transmission direction of the light beam, the dichroic mirror 203 is used to combine the red light and the blue light. In the transmission direction of the reflected light beam, the dichroic mirror 203 is used to separate the reflected light beam of the red light and the reflected light beam of the blue light.

[0039] according to Figure 1a and Figure 1b From the description, it can be seen that the motion trajectory of OPU 3 is a composite motion of linear motion and sinusoidal motion. Figure 3 The following is a schematic diagram of the unidirectional linear motion and sinusoidal motion provided in the embodiments of the present application. Figure 3As shown, the horizontal axis represents time and the vertical axis represents the distance moved. The curve 301 of the composite motion is equal to the superposition of the curve 302 of the sinusoidal motion and the curve 303 of the unidirectional linear motion. Among them, in the optical disc 7, the swing track and the data track are thread lines from the inside to the outside. Therefore, when the optical drive reads the data in the optical disc 7, the drive motor needs to drive OPU 3 to perform unidirectional linear motion from the inside to the outside along the optical disc. In addition, the center of the swing track and the rotation center of the optical disc 7 are not concentric, and there is an eccentric distance between the two. Therefore, in order to allow the red light to follow the swing track, it is necessary to change the position of OPU 3 by driving the motor so that OPU 3 moves radially along the optical disc 7. Every time the optical disc 7 rotates one circle, the movement trajectory of OPU 3 forms a period of 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.

[0040] exist Figure 3 In the example of FIG. 3 , the sinusoidal motion curve 302 is a single-frequency sinusoidal curve. It should be understood that Figure 3 The sinusoidal motion curve 302 provided in the embodiment of the present application is only an example provided. In practical applications, the curve of the repeated sinusoidal motion can be a sinusoidal curve of multiple frequencies. Among the sinusoidal curves of multiple frequencies, the amplitude of the sinusoidal curve of single frequency is the largest.

[0041] according to Figure 1a and Figure 1b From the description, it can be seen that in addition to the above-mentioned synthetic motion, the optical drive also needs to open the red light tracking closed loop and change the position of the objective lens 5 in OPU 3 through the OPU motor so that the red light can follow the swinging track. Figure 4 The curve diagram of the synthetic motion and linear reciprocating motion provided by the embodiment of the present application. Among them, the motion generated by the objective lens 5 through the closed loop of red light tracking 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, if Figure 4 As shown, the abscissa represents time and the ordinate 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.

[0042] In practical applications, the amplitude of the curve 302 depends on the deviation between the center of the swing track and the rotation center of the optical disk 7. When the deviation is larger, the amplitude of the curve 302 is larger. In general, the amplitude of the curve 302 can reach 100 microns. In the embodiment of the present application, by applying repeated 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 microns.

[0043] In practical applications, the drive motor is used to drive the OPU 3 to move along the guide rail 4 according to the first drive signal. Figure 3 From the description, it can be seen that the synthetic motion obtained by the first driving 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. The sinusoidal motion can be obtained based on the deviation between the center of the swing track and the rotation center of the optical disc 7. The present 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 OPU 3. This is described below.

[0044] OPU 3 includes a laser (e.g. Figure 2 The first laser 210 in FIG. 1 ), a light detector (eg Figure 2 The laser is used to generate a first light beam, and the first light beam is incident on the optical disc 7 through the objective lens 5. Under the premise that the first light beam is focused stably and the red light tracking is in an open loop, the light detector is used to receive the first light beam reflected from the optical disc 7 through the 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 This is a schematic diagram of the trajectory of red light provided in the embodiment of the present application. Figure 5 As shown in the figure, the horizontal axis represents time and the vertical axis represents position. Under the premise that the red light tracking is in an open loop, only the unidirectional linear motion of the drive motor is turned on. During the process of the optical disc 7 rotating one circle, the red light track will alternately intersect with the data layer track and the swing layer track. Among them, when the time is equal to 0, the red light track and the swing layer track intersect (that is, the position of the red light spot is on the swing track). After the optical disc 7 rotates one circle (at Figure 5 When the horizontal coordinate is 0.025, the red light track and the swing layer track intersect again. The position of the red light spot represents the relevant information of the deviation. The optical drive also includes a processing circuit. The processing circuit is used to obtain the trajectory of the sinusoidal motion according to the electrical signal. For example, the processing circuit is used to obtain the first repetition error RRO1 according to the following formula.

[0045]

[0046] 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 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 according to the trajectory of the sinusoidal motion and the trajectory of the unidirectional linear motion, and obtain the first drive signal according to 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.

[0047] After the drive motor drives OPU 3 to move along guide rail 4 according to the first drive signal, the optical drive starts the red light tracking closed loop. At this time, the optical drive can receive the reflected light beam of red light through the first detector and convert the reflected light 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 the 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 the trajectory information of the linear reciprocating motion. The processing circuit can be used to extract the trajectory of the low-frequency sinusoidal motion from the trajectory information of the linear reciprocating motion, and superimpose the trajectory of the low-frequency sinusoidal motion and the trajectory of the sinusoidal motion obtained according to the electrical signal to obtain a new trajectory of the sinusoidal motion. For example, under the closed loop of red light tracking, after the optical disc 7 rotates one circle, the processing circuit is used to collect the second drive signal during this circle. The processing circuit is used to convert the second drive signal into TES(k, j). The processing circuit is used to perform Fourier transform on TES(k, j) to obtain an electrical signal in the frequency domain. The processing circuit is used to extract the low-frequency electrical signal from the electrical signal in the frequency domain. The processing circuit is also used to perform inverse Fourier transform on the low-frequency electrical signal to obtain a second repetitive error. The processing circuit is used to superimpose the second repetitive error and the first repetitive error to obtain a third repetitive error. The third repetitive error corresponds to the trajectory of the new sinusoidal motion. The processing circuit is used to obtain the trajectory of the synthetic motion according to the trajectory of the new sinusoidal motion and the trajectory of the unidirectional linear motion, and obtain the third drive signal according to the trajectory of the synthetic motion. The driving motor is used to drive the OPU 3 to move along the guide rail 4 according to the third driving signal.

[0049] In the embodiment of the present application, the drive motor includes a stator and a mover. The mover and 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 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, in order to improve the stability of OPU 3 during the synthetic motion, the number of stator pairs is 2. Specifically, the drive motor includes two pairs of stators, each pair of stators includes an N-pole permanent magnet and an S-pole permanent magnet. The stator and the guide rail 4 are arranged in parallel. It should be understood that in actual applications, those skilled in the art can increase or decrease the number of stators according to needs.

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

[0052] The optical drive provided by the present application is described above, and the data processing device and data reading or storage method provided by the present application are described below. Figure 7 This is a schematic diagram of the structure of the data processing device provided in the embodiment of the present application. Figure 7As shown, the data processing device 700 includes a processor 702 and an optical drive 701. The processor 702 may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and a NP. The processor 702 may further include a hardware chip or other general-purpose processor. The above-mentioned hardware chip may 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 an 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 aforementioned Figures 1a to 6d A description of any figure in .

[0053] 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 memories. Among them, 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.

[0054] Figure 8 The flowchart of the data reading or storage method provided in the embodiment of the present application is shown in FIG. 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 by taking the data reading or storage method applied to a data processing device as an example. Figure 8 As shown, the data reading or storing method includes the following steps.

[0055] In step 801, a data processing device rotates an optical disk.

[0056] The data processing device carries and rotates the optical disk through the spindle motor. The optical disk is also called an optical disc, an optical disk or an optical disk. The data processing device can rotate the optical disk by 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 through a driving motor 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.

[0058] 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 linear 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 movement interval size of the objective lens is positively correlated with the change in the distance between the two light spots, that is, the larger the movement interval 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 interval 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.

[0059] It should be understood that the description of the data reading or storage method and the aforementioned Figures 1a to 6d There are similarities in the description of the optical drive in either figure. Figure 8 For the description of the data reading or storage method, please refer to the above Figures 1a to 6d Description of the optical drive in any figure. For example, the range of motion of the linear reciprocating motion is less than or equal to 10 microns. In 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 according to 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.

[0060] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present 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; 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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