JP2004199780A - Lens-driving device for optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens-driving device for an optical pickup which causes no step-out under a low temperature environment and brings out the ability of a driving source to the maximum under an ordinary temperature environment. <P>SOLUTION: The lens-driving device for an optical pickup is provided with a lens 4 for an optical pickup which reads out information recorded to a disk 2, a driving mechanism 6 having a motor 9 which can change the relative position to the disk 2 of the lens 4 for an optical pickup by moving the lens 4 for an optical pickup, and a high speed movement control part 18 which can move the lens 4 for an optical pickup at a high speed compared with a usual moving speed at which the lens 4 is moved when information is read out. In the driving device 1 for an optical pickup which drives the driving mechanism 6 based on a preliminarily prepared speed profile, the high speed movement control part 18 selects an adequate speed profile from two or more kinds of different speed profiles in accordance with a temperature around the motor 9 and drives the driving mechanism 6 based on the profile thus selected, when the lens 4 for an optical pickup is moved by the high speed movement control part 18. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lens driving device for an optical pickup.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various types of optical pickup lens driving devices that perform a search operation by driving an optical pickup lens that reads information from an optical disk such as a CD or an MD at a high speed based on a preset speed profile have been disclosed (for example, See Patent Documents 1 and 2).
[0003]
The optical pickup lens is driven in a vertical direction (focus direction) and a horizontal direction (tracking direction) with respect to the rotating optical disk to change the relative position with respect to the optical disk while recording information recorded on the recording surface of the optical disk. Is read. The optical pickup lens is driven in the focus direction to focus on the recording surface. The optical pickup lens is driven in the tracking direction, and moves between tracks at a normal speed in accordance with “playback”. A stepping motor is used as a driving source for driving the optical pickup lens.
[0004]
In the case of performing so-called "fast forward" or "rewind", particularly in the case of an operation of moving dozens of tracks (generally, such an operation is called a "search operation"), a lens for an optical pickup is used. Need to be moved at high speed in the horizontal direction. In this case, the optical pickup lens is driven by a high-speed movement control unit different from the control unit that controls movement in the normal tracking direction.
[0005]
That is, when such high-speed movement control is performed, the optical pickup lens is driven based on a preset speed profile. This speed profile takes into account the weight of the optical pickup lens, the frictional resistance of the sliding part, and other factors, and applies the speed at startup, the speed during high-speed rotation, and the rotation before the target position. This is for operating the timing and the like efficiently and reasonably.
[0006]
More specifically, first, the high-speed movement control unit activates the optical pickup lens, and then performs an initial operation of gradually increasing the rotation speed, and the moving speed of the optical pickup lens reaches the maximum speed. Each operation includes an intermediate operation for maintaining the rotation speed later and a final operation for applying a brake before a predetermined track at which the optical pickup lens reaches the target position. That is, the high-speed movement control unit controls the light based on the speed profile that sets the time for the initial operation, the time for maintaining the maximum speed and the maximum speed during the intermediate operation, and the time for the final operation. Controls the operation of the pickup lens.
[0007]
[Patent Document 1]
JP-A-2002-20963
[Patent Document 2]
JP 2000-76669 A
[0008]
[Problems to be solved by the invention]
As described above, in the optical pickup lens driving device, when performing a so-called search operation, the initial operation, the intermediate operation, and the final operation are performed in consideration of factors such as the weight of the optical pickup lens and the frictional resistance of the sliding portion. Is set. However, these factors change fluidly due to changes in the temperature environment. That is, in a low-temperature environment, the viscous resistance of the oil at each sliding portion such as the bearing portion and the lead screw portion increases. Therefore, in a low-temperature environment, the load on the mechanical operation increases, and the torque required for moving the pickup lens increases.
[0009]
Therefore, if the speed profile is set according to the driving capability of the stepping motor in a normal temperature environment, in a low temperature environment, there is a large difference between the driving speed set in the speed profile and the speed at which the stepping motor can be actually driven. Occurs. If the load of the mechanical operation exceeds the output torque of the stepping motor, there is a risk that the stepping motor loses synchronism and becomes inoperable.
[0010]
In a conventional lens drive device for an optical pickup, in order to prevent a stepping motor serving as a drive source from stepping out, a speed profile assuming the most severe condition of the temperature environment (under a low temperature environment) is used. In other words, a speed profile suitable for a situation in which the movement environment of the pickup lens is poor and the lens does not operate smoothly is set as a speed profile in all environments.
[0011]
However, conversely, if such a setting is made, when the stepping motor is driven in a normal temperature environment, there arises a problem that the stepping motor cannot exert its driving capability sufficiently.
[0012]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens driving device for an optical pickup which does not lose synchronism in a low-temperature environment and can maximize the capability of a driving source under a normal temperature environment in view of the above-mentioned problems. It is in.
[0013]
[Means for Solving the Problems]
In view of the above problems, an optical pickup lens driving device according to the present invention moves an optical pickup lens that reads information recorded on a disk and an optical pickup lens to move the relative position of the optical pickup lens with respect to the disk. A high-speed movement control unit including a drive mechanism having a motor capable of changing the speed, and a high-speed movement control unit capable of moving the optical pickup lens at a high speed as compared with a movement speed at the time of reading normal information. When the optical pickup lens is moved by the unit, the optical pickup lens driving device drives the driving mechanism based on a speed profile prepared in advance, and the high-speed movement control unit is different depending on the temperature around the motor. Select an appropriate speed profile from among a variety of speed profiles and select the selected speed profile. Based on the profile, it is characterized by operating the drive mechanism.
[0014]
Another aspect of the present invention is the above-described lens drive device for an optical pickup, further comprising a temperature measuring unit for measuring a temperature around the motor.
[0015]
According to another aspect of the present invention, in each of the above-described optical pickup lens driving devices, three types of speed profiles are used, one of which is a low-speed speed profile, and one of the other two is a medium-speed speed profile. The remaining one is characterized by a high speed profile.
[0016]
According to another aspect of the present invention, in the above-described lens driving device for an optical pickup, the high-speed movement control unit performs the driving based on the high-speed speed profile when the temperature measured by the temperature measuring means is 0 ° C. or more. When the temperature is lower than 0 degrees and 10 degrees below zero degrees Celsius, the driving is performed by the medium speed profile. 3) When the temperature is lower than 10 degrees below 0 degrees Celsius, the driving is performed based on the low speed profile.
[0017]
Further, another invention has an optical pickup lens for reading information recorded on a disk, and a motor capable of moving the optical pickup lens to change a relative position of the optical pickup lens with respect to the disk. When the optical pickup lens includes a driving mechanism and a high-speed movement control unit that can move the optical pickup lens at a higher speed than a moving speed when reading normal information, and the high-speed movement control unit moves the optical pickup lens. A lens drive device for an optical pickup that drives a drive mechanism based on a speed profile prepared in advance, wherein the high-speed movement control unit outputs a motor drive signal having two or more different waveforms according to the temperature around the motor. From among them, select a motor drive signal with an appropriate waveform and use the selected motor drive signal to It is characterized in that to operate the.
[0018]
Further, another invention has an optical pickup lens for reading information recorded on a disk, and a motor capable of moving the optical pickup lens to change a relative position of the optical pickup lens with respect to the disk. When the optical pickup lens includes a driving mechanism and a high-speed movement control unit that can move the optical pickup lens at a higher speed than a moving speed when reading normal information, and the high-speed movement control unit moves the optical pickup lens. A lens driving device for an optical pickup that drives a driving mechanism based on a speed profile prepared in advance, wherein controlling a rotation speed of the motor based on a predetermined time function using a temperature around the motor as a parameter. Features.
[0019]
According to another aspect of the present invention, in the above-described lens drive device for an optical pickup,
It is characterized in that the time function is represented by the following equation (1).
f (t) = fmax × (1-e^{- t / τ}) ・ ・ ・ Formula (1)
fmax: Maximum pulse rate that varies by multiplying a coefficient determined in advance by temperature
τ: Time constant that varies by multiplying a coefficient determined in advance by temperature
[0020]
Another invention is the above-described lens drive device for an optical pickup,
It is characterized in that the time function is represented by the following equation (2).
f (t) = k · t formula (2)
k: Coefficient that varies with temperature
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a lens driving device for an optical pickup according to the present invention will be described in detail with reference to FIGS.
[0022]
FIG. 1 is a block diagram showing the configuration of the optical pickup lens driving device of the present invention.
[0023]
An optical pickup lens driving device 1 includes a spindle motor 3 that rotationally drives a disk 2 and an optical pickup lens that focuses a laser beam on a recording surface (a lower surface in FIG. 1) of the disk 2 and reads recorded information. Four. The optical pickup lens 4 is a part of the optical pickup unit 5 that reads information from the disk 2. The optical pickup unit 5 is provided with various information reading members such as a light emitting diode that emits laser light and a photodiode that receives light reflected back from the disk surface.
[0024]
The optical pickup lens 4 is driven by the pickup drive mechanism 6 to change the relative position with respect to the disk 2. The pickup drive mechanism 6 includes a fine movement actuator 7 for slightly moving the optical pickup lens 4 in a vertical direction (hereinafter, referred to as a focus direction) and a disk radial direction (hereinafter, referred to as a tracking direction), an optical pickup section 5 and a fine movement. It has a carriage 8 on which an actuator 7 is mounted, a stepping motor 9 for moving the carriage 8 in the tracking direction, and a lead screw 10 attached to the rotation center of the stepping motor 9.
[0025]
Further, a thermistor 11 as a temperature measuring means for measuring the temperature around the stepping motor 9 is arranged near the stepping motor 9. Information on the temperature measured by the thermistor 11 is sent to the control circuit 12. The thermistor 11 may be attached to a mechanical chassis body to which the stepping motor 9 is attached, or may be provided outside the motor case of the stepping motor 9 or the like. Further, the temperature measuring means may be constituted by a temperature sensor other than the thermistor 11.
[0026]
The information read by the optical pickup unit 5 is sent to the amplifier 13. The amplifier 13 generates an RF signal based on the received information. This RF signal is sent to the signal processing unit 14. The signal processing unit 14 performs predetermined signal processing and sends the result to the D / A converter 15. The signal converted by the D / A converter 15 is sent to a speaker.
[0027]
The control circuit 12 includes a rotation control unit 16 for controlling and driving the spindle motor 3, a reproduction drive control unit 17 for controlling the fine movement actuator 7 and the stepping motor 9 during the "reproduction" operation, and the optical pickup lens 4 during the search operation. A high-speed movement control unit 18 for moving the control unit at high speed, and a control unit 19 for receiving various information from the thermistor 11 and the amplifier 13 and controlling the operation of each control unit based on the received information.
[0028]
The rotation control unit 16 controls the drive of the spindle motor 9 so that the rotation speed is determined according to the position in the radial direction on the disk 2 which is being read out.
[0029]
When reading out the data recorded on the disk 2, the reproduction drive control unit 17 rotates the fine movement actuator 7 while moving the carriage 8 little by little by moving the stepping motor 9 outward in the tracking direction. Of the disk 2 to be traced in order. By tracing in this manner, information is sequentially read from each track of the disk 2.
[0030]
The control circuit 12 also stores a plurality of speed profiles (three speed profiles in the present embodiment) for setting the driving speed of the high-speed movement control unit 18 according to the temperature. And a speed profile selection unit 21 for selecting a speed profile appropriate for the measured temperature from the three types of speed profiles stored in the speed profile storage unit 20.
[0031]
The speed profile storage unit 20 stores three types of speed profiles. These speed profiles are for a so-called “fast-forward” or “rewind”, and in particular, when the optical pickup lens 4 must be moved by dozens of tracks, a driving program for driving the stepping motor 9 is used. is there.
[0032]
In the present embodiment, a plurality of types of speed profiles are selectively used according to the temperature around the stepping motor 9.
[0033]
FIG. 2 is a graph showing three types of speed profiles stored in the speed profile storage unit 20. In FIG. 2, the vertical axis represents the rotation speed (rpm) of the stepping motor 9 rotating as a result of driving the high-speed movement control unit 18 according to each speed profile, and the horizontal axis represents the driving time (t) of the stepping motor 9. is there.
[0034]
An arrow A in FIG. 2 indicates a high-speed speed profile when the high-speed movement control unit 18 drives the stepping motor 9 at the highest speed and moves the optical pickup lens 4 at the highest speed. The high-speed speed profile A is used when the temperature around the stepping motor 9 is measured by the thermistor 11 and the temperature is 0 ° C. or higher.
[0035]
That is, the high-speed speed profile A is used in a temperature environment in which the rotation capability of the motor can be maximized. In such a temperature environment, the lubricating oil and the like used for various sliding parts such as the bearing portion become smooth, so that the mechanical operation load is less than in a low temperature environment where the temperature is reduced to zero, and the stepping motor is used. 9 can be fully utilized.
[0036]
According to the speed profile A for high speed, the rising time (time required for the initial operation) t1 from the start of the stepping motor 9 until the rotation speed becomes the maximum is the initial time of the other two types of speed profiles B and C. The time required for the operation is shorter than t2 and t3.
[0037]
Further, according to the high speed profile A, the time t11 for maintaining the state where the rotation speed of the stepping motor 9 is maximized (the time required for the intermediate operation) is different from the intermediate operation in the other two types of speed profiles B and C. The time is shorter than the times t22 and t33. In addition, the maximum rotation speed of the stepping motor 9 during the intermediate operation of the high-speed speed profile A is larger than the maximum rotation speed of the stepping motor 9 during the intermediate operation of the other two speed profiles B and C.
[0038]
Further, according to the high-speed speed profile A, when the optical pickup lens 4 reaches a predetermined track in front of the target position track, the brake starts to be applied when the optical pickup lens 4 reaches the predetermined position, and then the optical pickup lens 4 The time t111 (time required for the final operation) until the movement stops is shorter than the time t222 and t333 required for the final operation of the other two types of speed profiles B and C.
[0039]
As described above, according to the high speed profile A, the times t1, t11, and t111 from the initial operation to the final operation are all shorter than those of the other two speed profiles B and C. In the high-speed speed profile A, the rotational speed rpm1 of the stepping motor 9 during the intermediate operation is larger than the rotational speeds rpm2 and rpm3 of the stepping motor 9 during the intermediate operation of the other two speed profiles B and C. Therefore, the use of the high-speed speed profile A makes it possible to draw out the ability of the stepping motor 9 more greatly and to increase the moving speed of the optical pickup lens 4 as compared with the other two speed profiles B and C.
[0040]
The arrow B in FIG. 2 indicates a medium speed profile when the high speed movement control unit 18 drives the stepping motor 9 at an intermediate speed to move the optical pickup lens 4 at an intermediate speed. . This medium speed profile B is used when the temperature around the stepping motor 9 is measured by the thermistor 11 and the temperature is lower than 0 degree Celsius and 10 degrees Celsius or lower. That is, the medium speed profile B is used in a temperature environment in which the rotation capability of the motor is slightly inferior to that at normal temperature and high temperature.
[0041]
According to the speed profile B for the medium speed, the rise time t2 (time required for the initial operation) to reach the maximum speed is longer than the time t1 required for the initial operation of the speed profile A for the high speed, and the speed profile for the low speed is obtained. It is shorter than the time t3 required for the initial operation of C.
[0042]
According to the medium speed profile B, the time t22 (time required for the intermediate operation) for maintaining the state where the rotation speed of the stepping motor 9 is maximized is longer than the time t11 required for the intermediate operation of the high speed profile A. It is long and shorter than the time t33 required for the intermediate operation of the low speed profile C.
[0043]
In addition, the maximum rotation speed rpm2 of the stepping motor 9 during the intermediate operation of the middle speed profile B is smaller than the maximum rotation speed rpm1 of the stepping motor 9 during the middle operation of the high speed profile A, while It is larger than the maximum rotation speed rpm3 of the stepping motor 9 during the intermediate operation of the speed profile C.
[0044]
Further, according to the medium speed profile B, when the optical pickup lens 4 reaches a predetermined track in front of the target position track, the brake starts to be applied when the optical pickup lens 4 reaches the target position, and then the optical pickup lens 4 Is longer than the time t111 required for the end operation of the high-speed speed profile A, while the time t222 required for stopping the movement (time required for the final operation) is shorter than the time t333 required for the end operation of the low-speed speed profile C.
[0045]
As described above, according to the medium speed profile B, the times t2, t22, and t333 from the initial operation to the final operation are different from the time t1 from the initial operation to the final operation of the other two speed profiles A and C. The time is set to be between t3, t11 to t33, and t111 to t333.
[0046]
The medium speed profile B is set such that the rotation speed of the stepping motor 9 during the intermediate operation is a value between the rotation speeds of the stepping motor 9 during the intermediate operation of the other two speed profiles A and C. Have been. From these facts, when the medium speed profile B is used, the moving speed of the optical pickup lens 4 is a value between the moving speeds of the optical pickup lens 4 according to the other two speed profiles A and C.
[0047]
The arrow C in FIG. 2 indicates a low-speed speed profile when the high-speed movement control unit 18 drives the stepping motor 9 at the lowest speed and moves the optical pickup lens 4 at the lowest speed.
[0048]
The low-speed speed profile C is used when the temperature around the stepping motor 9 is measured by the thermistor 11 and the temperature is lower than 10 degrees below zero degrees Celsius. That is, the low speed profile C is used when driving the motor under the most severe condition of extremely low temperature.
[0049]
According to the low-speed speed profile C, the rise time (time required for the initial operation) t3 from the start of the stepping motor 9 to the maximum number of rotations thereof is equal to the initial operation of the other two speed profiles A and B. Is longer than the times t1 and t2 required for.
[0050]
Further, according to the low-speed speed profile C, the time t33 for maintaining the state in which the rotation speed of the stepping motor 9 is maximized (time required for the intermediate operation) is the time required for the intermediate operation in the other two speed profiles A and B. It is longer than the times t11 and t22. In addition, the maximum rotation speed of the stepping motor 9 during the intermediate operation of the low-speed speed profile C is smaller than the maximum rotation speed of the stepping motor 9 during the intermediate operation of the other two speed profiles A and B.
[0051]
Further, according to the low-speed speed profile C, when the optical pickup lens 4 reaches a predetermined track in front of the target position track, the brake is started to be applied, and then the optical pickup lens 4 The time t333 until the movement stops (the time required for the final operation) t333 is longer than the times t111 and t222 required for the final operations of the other two speed profiles A and B.
[0052]
As described above, according to the low speed profile C, the times t3, t33, and t333 from the initial operation to the final operation are longer than the other two types of speed profiles A and B. In the low speed profile C, the rotation speed of the stepping motor 9 during the intermediate operation is smaller than those of the other two speed profiles A and B. Therefore, when the low speed profile C is used, the moving speed of the optical pickup lens 4 becomes slower than the other two speed profiles A and B.
[0053]
As described above, the present invention switches the speed profile as a program for driving the stepping motor 9 in accordance with the ambient temperature of the stepping motor 9 and performs drive control corresponding to the ambient temperature. The stepping motor 9 can be sufficiently rotated at each temperature without causing step-out of the step 9.
[0054]
Hereinafter, the operation of the optical pickup lens driving device 1 configured as described above will be described with reference to FIG.
[0055]
During the reproducing operation, the control circuit 12 drives the pickup driving mechanism 6 (more specifically, the stepping motor 9 and the fine actuator 7) by the reproducing drive control unit 17 while driving the spindle motor 3 by the rotation control unit 16. Then, the optical pickup lens 4 is moved. Information read from the disk 2 using the optical pickup lens 4 is sent from the amplifier 13 to the signal processing unit 14, and after a predetermined process, sent to the speaker via the D / A converter 15.
[0056]
When the “search for” or the like is operated by the operation button during the “playback” operation, the control circuit 12 performs control for performing a search operation (“fast forward” or “rewind”).
[0057]
First, the control unit 19 sends the information on the temperature constantly transmitted from the thermistor 11 to the speed profile selection unit 21 as the temperature around the stepping motor 9.
[0058]
The speed profile selection unit 21 selects a speed profile appropriate for the temperature from the speed profile storage unit 20 based on the temperature data sent from the control unit 19. Then, the speed profile selecting unit 21 sends information on the selected speed profile to the control unit 19.
[0059]
The control unit 19 sends the selected speed profile to the high-speed movement control unit 18. The high-speed movement control unit 18 controls the drive of the stepping motor 9 of the pickup drive mechanism 6 based on the speed profile sent from the control unit 19.
[0060]
More specifically, the control unit 19 determines whether the ambient temperature T of the stepping motor 9 detected by the thermistor 11 is equal to or higher than 0 degree Celsius (Step S1). As a result, if it is 0 degrees Celsius or more (YES in step S1), speed profile selecting section 21 reads out high-speed speed profile A from speed profile storage section 20 (step S2). Subsequently, the high-speed movement control unit 18 performs drive control based on the high-speed speed profile A (Step S3).
[0061]
In the case of NO in step S1, the control unit 19 determines whether or not the ambient temperature T of the stepping motor 9 is lower than 0 degrees Celsius and 10 or more below zero degrees Celsius (step S4). As a result, when the ambient temperature T of the stepping motor 9 is lower than 0 degrees Celsius and equal to or higher than 10 degrees below zero degrees Celsius (YES in Step S4), the speed profile selection unit 21 stores the speed profile B for the medium speed from the speed profile storage unit 20. Is read (step S5). Subsequently, the high-speed movement control unit 18 performs drive control based on the medium-speed speed profile B (step S6).
[0062]
If NO in step S4, the speed profile selection unit 21 reads the low speed profile C from the speed profile storage unit 20 (step S7). Subsequently, the high-speed movement control unit 18 performs drive control based on the low-speed speed profile C (Step S8).
[0063]
The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the above-described embodiment, three different types of speed profiles A, B, and C are prepared, a speed profile appropriate for the temperature around the stepping motor 9 is selected, and the speed profile of the stepping motor 9 is selected based on the speed profile. Drive control is being performed. However, the number of speed profiles may be two instead of three, or may be four or more.
[0064]
Further, in the above-described embodiment, a plurality of types of speed profiles are prepared and are selectively used according to the temperature around the stepping motor 9. However, regardless of the presence or absence of various speed profiles, the motor is used in accordance with the temperature. May be changed. For example, as shown in FIG. 4, it is also possible to use a speed profile for driving the stepping motor 9 with a sine wave at normal temperature and high temperature, and to use a speed profile for driving the stepping motor 9 with a square wave at low temperature. It is possible. As described above, by properly using the speed profiles having different driving waveforms for driving the stepping motor 9, the motor torque, the power consumption, and the heat generation amount can be appropriately set.
[0065]
Further, in the above-described embodiment, three speed profiles are prepared in advance, and these three speed profiles are selectively used according to the temperature. However, the motor is controlled by a predetermined time function using the temperature around the motor as a parameter. The rotation speed may be controlled.
[0066]
For example, it is set so that the rotation speed of the motor is controlled using a time function represented by the following equation (1).
f (t) = fmax × (1-e^{- t / τ}) ・ ・ ・ Formula (1)
Then, fmax (maximum pulse rate) in the above equation (1) is multiplied by a coefficient preset according to the temperature around the motor. Thereby, the maximum pulse rate fluctuates. Based on the equation (1), the rotation speed of the motor is set, and the driving mechanism is operated. In this case, the drive control of the motor can be performed in accordance with the finer temperature setting.
[0067]
Further, for example, it is set so as to control the rotation speed of the motor using a time function represented by the following equation (2).
f (t) = k · t formula (2)
Then, k in the above equation (2) is multiplied by a coefficient preset according to the temperature around the motor. Thus, the coefficient k varies according to the temperature. The rotation speed of the motor is set based on the equation (2), and the drive mechanism is operated. In this case, the drive control of the motor can be performed in accordance with the finer temperature setting.
[0068]
【The invention's effect】
As described above, according to the lens driving device for an optical pickup of the present invention, it is possible to prevent the step-out in a low temperature environment and to maximize the capability of the driving source in a normal temperature environment.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of an embodiment of a lens driving device for an optical pickup according to the present invention.
FIG. 2 is a graph showing a relationship between a rotation speed and a driving time of a stepping motor driven based on each speed profile in the embodiment of the optical pickup lens driving device according to the present invention.
FIG. 3 is a flowchart showing a search operation in the embodiment of the optical pickup lens driving device according to the present invention.
4A and 4B are diagrams showing a modification of the embodiment of the optical pickup lens driving device according to the present invention, wherein FIG. 4A shows a driving waveform of a motor used at normal temperature and high temperature, and FIG. The respective drive waveforms are shown.
[Explanation of symbols]
1. Lens drive device for optical pickup
2 disks
3a, 3b speaker
4 Optical pickup lens
5 Optical pickup unit
6 Pickup drive mechanism
9 Stepping motor
11 Thermistor

Claims (8)

An optical pickup lens for reading information recorded on the disk, a drive mechanism having a motor capable of moving the optical pickup lens to change the relative position of the optical pickup lens with respect to the disk, and A high-speed movement control unit capable of moving the pickup lens at a higher speed than the normal moving speed when reading out normal information. When the optical pickup lens is moved by the high-speed movement control unit, it is prepared in advance. An optical pickup lens driving device that drives the driving mechanism based on the speed profile,
The high-speed movement control unit selects an appropriate speed profile from two or more different speed profiles depending on the temperature around the motor, and controls the drive mechanism based on the selected speed profile. A lens driving device for an optical pickup, which is operated. 2. The lens driving device for an optical pickup according to claim 1, further comprising a temperature measuring unit that measures a temperature around the motor. The speed profile has three types, one of which is a low-speed profile, one of which is a medium-speed profile, and the other is a high-speed profile. Item 3. An optical pickup lens driving device according to item 1 or 2. The high-speed movement control unit, when the temperature measured by the temperature measurement unit is 0 degrees Celsius or more, driving by the high-speed speed profile,
2) When the temperature is lower than 0 degrees Celsius and 10 degrees or lower below zero degrees Celsius, the drive according to the medium speed speed profile is performed,
3. The lens driving device for an optical pickup according to claim 3, wherein when the temperature is lower than 10 degrees below zero degrees, the driving according to the speed profile for low speed is performed. An optical pickup lens for reading information recorded on the disk, a drive mechanism having a motor capable of moving the optical pickup lens to change the relative position of the optical pickup lens with respect to the disk, and A high-speed movement control unit capable of moving the pickup lens at a higher speed than the normal moving speed when reading out normal information. When the optical pickup lens is moved by the high-speed movement control unit, it is prepared in advance. An optical pickup lens driving device that drives the driving mechanism based on the speed profile,
The high-speed movement control unit selects a motor drive signal having an appropriate waveform from among motor drive signals having two or more different waveforms according to the temperature around the motor, and selects the selected motor drive signal. A lens driving device for an optical pickup, wherein the driving mechanism operates. An optical pickup lens for reading information recorded on the disk, a drive mechanism having a motor capable of moving the optical pickup lens to change the relative position of the optical pickup lens with respect to the disk, and A high-speed movement control unit capable of moving the pickup lens at a higher speed than the normal moving speed when reading out normal information. When the optical pickup lens is moved by the high-speed movement control unit, it is prepared in advance. An optical pickup lens driving device that drives the driving mechanism based on the speed profile,
A lens driving device for an optical pickup, wherein a rotation speed of the motor is controlled based on a predetermined time function using a temperature around the motor as a parameter. The lens drive device for an optical pickup according to claim 6, wherein the time function is represented by the following equation (1).
f (t) = fmax × (1−e ^{− t / τ} ) (1)
fmax: Maximum pulse rate fluctuated by multiplying a predetermined coefficient by temperature τ: Time constant fluctuated by multiplying a predetermined coefficient by temperature 7. The lens driving device for an optical pickup according to claim 6, wherein the time function is represented by the following equation (2).
f (t) = k · t formula (2)
k: Coefficient that varies with temperature

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