TW594678B - Low-inertia CD driving device - Google Patents

Abstract

The present invention relates to a low-inertia CD driving device, wherein the low-inertial CD driving device is to make the disk and the laser head steady, and to switch the reading/writing position of the light path irradiating on the disk by using the optical members as the transmission media of light path for laser head, and it has a displacement device for switching the position of the optical member. The focusing device includes two stiff sliding rails, one focusing coil, and two permanent magnets; wherein the stiff sliding rails are used as the linkage between the optical member and the focusing coil; and, by converting the focusing errors caused by the laser beam transmitted through the optical member into the focusing driving voltage to be applied on the focusing coil to generate the magnetic field, and interacts with the magnetic field of the permanent magnet, so that the focusing coil can generate the displacement in the vertical direction to lead the stiff sliding rails moving up and down, and driving the optical member with slight displacement to more precisely locate the light spot on the disk.

Description

594678

Summary of the invention: The present invention relates to a focusing device on a low-inertia optical disc driven disc driven by a low-inertia disc and a laser head which are stationary and transfer media. Optical disk drive device (1), especially one that uses optical components as a laser head optical path device, so that the light spot can fall more accurately on the technical background description: Press, the read and write operation technology adopted by the existing optical disk drive device is a disc Fork rotation, the laser head makes a linear reciprocating motion. The conventional low-speed optical disc drive mostly uses the disc "constant linear speed" (c〇nstant Linear

Velocity ‘CLV’ method, the current reading and writing technology has been turned into a disc " local constant angular velocity " (PCAV) or " constant angular velocity " (constant

Angular Velocity (referred to as CAV), when the laser head reads and writes data at any position on the disc, the motor rotates at the same speed. In terms of improving the speed of reading data, it is still a traditional practice to use the speed of the motor to increase the speed of the motor. Nowadays, some optical disc drives and DVDR0M have already used "True X" technology (" True X " Multi-beam Technology), " "True X" technology can ensure that the optical disc device reads the disc at a relatively uniform speed over the entire range of the disc, and it only changes the speed due to different disc quality and operating systems. DVD reading technology currently It is also not very consistent. In the past, in order to be compatible with ordinary CDROM discs, the DVDR0M used double optical head technology to achieve double reading. At present, the single lens technology is generally used. In addition, the digital servo system can realize the servo mechanism of the optical disc drive. Automatically adjust the disc

594678 V. Description of the invention (2)-The accuracy of the machine-readable data has been improved; the dual dynamic anti-vibration suspension system (DDSS) technology can effectively reduce the vibration of the optical disc drive during high magnification rotation; ABS (Auto Balance System) automatically The balance system keeps the disc always rotating horizontally, which improves the disc reading ability of the disc drive. Artificial Intelligence Error Correction (AIEC) can greatly increase the number of correct data read by the disc. The adoption of many new technologies mentioned above has continuously improved the performance of optical disc drive devices. However, at present, optical disc drive devices are still used to rotate the disc at high speed and the laser head reciprocates linearly. Due to the large inertia of the disc and the high quality of the laser head, Existing optical disc drive devices have high energy consumption, large vibration during the reading process, and generate a lot of thermal energy, which limits the use of optical disc drive devices. For example, the existing optical disc drive device technology cannot be used in personal digital assistants (pDA,

Personal Digital Assistant) device, the PM is a handheld device that integrates computing, telephone, fax, and network functions. These functions can be implemented wirelessly. PDA's peripherals must have low energy consumption and cannot release excessive thermal energy. However, current optical disc drive devices cannot achieve low energy consumption and low thermal energy release due to the limitations of the disc's inertia and the mass of the laser head. Again, the optical disc has a high information bit density, and its density can reach 108bit / cm2. Correspondingly, its execution interval and bit length are reported to be small. At present, the track interval of a CD-ROM disc is 1 > 6 骋, the minimum bit length is 0.83 髀, the track interval of a DVD disc is 0.84 髀, and the minimum bit length is 0.45 髀. It can be seen that in order to read and write correctly, it is required that the reading and writing unit has a sub-micron level positioning accuracy. Generally speaking, the axial deviation of the light spot from the signal storage plane cannot exceed ± 丨 髀.

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Purely relying on mechanical systems to ensure the positioning accuracy of the read-write head, it is almost impossible to process and assemble the entire system to sub-micron accuracy and work with the same accuracy. At present, the optical disc drive device generally uses a servo system to ensure that the light spot is accurately positioned on the optical disc channel. The focus servo system is the most basic servo system of the optical disc drive. Its function is to make the focus of the laser beam accurately fall on the recording surface of the optical disc, and to automatically track the movement of the recording surface with the rotation and offset of the optical disc. Keep the recording surface within the focal depth range of the focus. There are many methods for the traditional optical head to detect the focus error signal. The commonly used methods are detect method using beam of light deviated the center of field lens, detect method by refraction of Cylindricai iens, and threshold. Angle method (detect method by critical angle) and so on. In a holographic optical head (^ olographic lens), the extraction of data information and servo signals are performed by a holographic element (H0E). The method of detecting the focus servo signal is commonly the spot size detection method (Sp. t size detection; SSD). However, the prior art focusing device is mounted on the laser head ', and the laser head frequently performs reciprocating linear motions. Due to the large mass of the focusing coil, the instantaneous speed of frequent linear reciprocating motions is large, and a large amount of power is consumed. The reason is that the inventor of the present case has the disadvantages caused by the rotation of the laser head and the disc when the laser head performs linear reciprocating movements during the reading and writing operation to control the conversion of the light emitted by the laser head. Keep it still when it comes out, and change the reading position by loading the disc with a displacement.

594678 V. Description of the invention (4): The low-inertia optical disc drives the stomach of the data position of the optical disc. The displacement device: a rotation indicator, a rotational driving device and a translation device. Below the read-write surface of the disc, a fixed position is provided at the center of the disc. Anti-d points! 1 is equipped with a movable mirror and a balance block; the rotary drive is reversed μ # 2: The rule describes the rotation of the rotation index, and the translation device controls the aforementioned two optical paths to rotate in the rotation index and control the data reading Take the road position transformation. The main purpose of the present invention is to develop a focusing device for reading and writing data from a laser head based on the aforementioned structure of a low-inertia optical disc drive device. Under the premise of ensuring the focus of the laser beam emitted by the laser head: ΐί disc recording surface And make the light spot automatically track the movement of the recording surface, so that the recording surface remains within the focal depth range of the focus. Another object of the present invention can be achieved by adopting a closed-loop focus control loop, using a spot size probe to detect a temple service signal, and driving the focusing device after phase and amplitude compensation and power amplification of the focus servo signal. Control the movement of the focusing objective so that the light spot falls exactly on the disc. The structure design and technical principles of the present invention will be described in detail below, and the attached features will be understood by referring to the attached drawings, among which: fixe / detailed description of the present invention: the disc according to the present invention Tablet 20 is a computer's file storage medium, including ISO-9660, Joliet * Romeo and other file systems. 594678 V. Description of the invention (5) The present invention includes: a press-fitting fixing device 10 (as shown in FIG. 1), which is composed of a disc mounting and a disc lower support 12, and the disc 20 is mounted On the disc lower seat 12, the disc mounting upper pressing device 11 presses the disc 20 down on the lower disc I support 12, so that the disc 20 is fixed, thereby ensuring that the disc 20 cannot rotate. The Zhuyi displacement device is used to control and change the position of the beam emitted by the laser head on the disc 20, including: "A rotation index 30 (as shown in Figures 2A and B), which is set on the disc 20 and reads as A hollow pipe body with an angular groove 31 (as shown in FIG. 4B) is provided with a hole 32 at the center of the rotation index 30, and a gear 33 connected with the rotation index 30 is protruded below the hole 32. The center of the gear 33 coincides with the center A-B of the rotation index 30, which can drive the rotation index to perform a rotating motion. 0 Both ends of the rotation index 30 have a light suspension wheel M. The mass suspension ocean wheel 34 The horizontal center axis C — D of the rotation index can be used for continuous H = movable '. The light suspension wheel 34 comes into contact with the ring-shaped limiter during the rotary movement, and the ring-shaped limiter device 36 remains stationary to prevent the rotation speed. Excessive jitter during rotation makes it difficult to control the rotation index within a suitable deflection. The rotation driving device 35 is composed of a driving horse combined with a gear 352, and the gear 352 is coupled to the aforementioned gear 33; the driving horse Directly drive the descent wheel 352 to rotate, and drive the gear 33 to rotate, The clasp 30 is continuously rotated with the central axis A-B as an axis.

Page 8 594678 V. Description of the invention (6) A set of optical components is used as the transmission component of the light beam emitted by the laser head, including: a fixed reflector 40 (Figure 3 A, B, Figure 4 A, B, C ), Fixed at the center of the rotation indicator 30. A movable mirror 41 is fixed on a sliding rod 411. The sliding rod 411 passes through a moving plate 412 with a hole and a lateral groove 31 of the rotation indicator 30 into the rigid slide rail 60. The moving plate A set of shaft sleeves 41 3 is provided at the bottom of 41 2 at the rotation index 30. In addition, a focusing lens 414 for concentrating a laser beam is provided above the movable mirror 41. A balance block 42 is used to maintain the balance of the rotation index 30. It is fixed on a sliding rod 421 opposite to the movable mirror 41. The sliding rod 421 also passes through a moving plate 422 with holes and rotates. The lateral groove 31 of the indicator 30 enters the rigid slide rail 60, and a set of shaft sleeves 423 are also provided at the bottom of the moving plate 422 and arranged on the rotation indicator 30. One of the two moving plates 412 and 422 is provided with a rack 415 and 424 on one side, which are respectively arranged on the two translation devices corresponding to the movable mirror 41 and the balance block 42 (as shown in FIGS. 3A and B) ), Including: A hollow transmission member 50, which is fixed in the hole 32 of the aforementioned rotation index 30. The two ends are provided with a gear 51, 52; of which the upper gear 51 is a mouthpiece and then returns to the second tooth. Articles 415, 424; combined at up to 53, which is combined with a gear 531, which is eaten at the lower gear 52 of the second transmission member 50 to drive the movable reflection

Page 9 594678 V. Description of the invention (7) The mirror 41 and the weight 42 move back and forth in a straight line. The feeding motor 53 drives the gear 531 to drive the hollow transmission member 50 and the lower gear 52 to rotate, and causes the upper gear 51 of the hollow transmission member 50 to drive the two racks 415 and 424 to change the racks 415 and 424 to move in a straight line. Therefore, the movable mirror 41, the focusing lens 414, and the balance block 42 are driven synchronously in the CD direction to move back and forth in a straight line, that is, the movement direction of the balance block μ is opposite to that of the movable mirror 41, so that the rotation index is always maintained. The balance of 30 makes the rotating indicator 30 maintain a dynamic balance state of the whole rotating indicator 30 when the rotating indicator 30 rotates at a high speed; while the fixed reflector 40 is fixed at the center position of the rotating indicator 30, it will only do with the rotating indicator 30 Rotate at high speed to keep the relative angle with the movable mirror 41 unchanged. A focusing device (as shown in Figure 4A) is used to drive the movable mirror 41 and focusing lens 414 of the aforementioned optical components to move up and down slightly, so that the light spot can accurately fall on the disc > including : Two rigid slide rails 60 are located inside the rotation index 30 as the movable orbits of the movable mirror 41 and the balance block 42 and the linkages for controlling the upper and lower slight displacements. One end of the two rigid slide rails 60 The system is arranged on the focusing coil 61, and the other end is provided with sliding rods 411 and 421 fixed with a movable mirror 41 and a balance weight 42 in a proper position. As shown in the enlarged view of the EE cross section shown in FIG. 4B, the aforementioned rigid slider 60 is a C-shaped groove structure, and the lower ends of the sliding rods 411 and 421 are inverted T-shaped structures, which cooperate with the c-shaped groove structure. The sliding rods 411 and 412 can be slid in the rigid slide rail 60, and can be linked with the rigid slide rail 60. The contact surface between the rigid sliding rail 60 and the sliding rod 411 is smooth, and the sliding friction coefficient is very high.

Page 10 594678 V. Description of the invention (8) Small. The structure of the slide bar 421 which is also connected to the balance weight 42 is the same as that of this portion. A focusing coil 61, as shown in the enlarged view of the FF section in FIG. 4C, is set around the hollow transmission member 50 in the rotation index 30, and is evenly distributed below the focusing coil 61 with the axis of the focusing coil 61 as the symmetry axis. There are four springs 62, one end of each spring 62 is connected to the focus coil 61, and the other end is fixed to the inner bottom surface of the rotation indicator 30. When there is no current in the focus coil 61, at this time, the forces of the springs 6 and 2 are in a balanced state, and the focus coil 61 is in the rotation index 30. When a current is passed through the focus coil 61, the focus coil 61 is in a magnetic field force. Together with the spring 62, it moves up and down. ^ Two permanent magnets 63, which are located at the upper and lower sides of the rotating fingers 13 relative to the focusing coil 61. This magnet ⑼ also has holes μ 1 so that the beam emitted by the laser head can be irradiated to the fixed mirror. 40%. As shown in FIG. 5, it is a structural schematic diagram of the present invention; the diagram is a combined schematic diagram of FIGS. 2 to 4; the disc 20 is placed on the disc lower bracket 12, and the disc pressing device 11 The disc 20 is locked and fixed, and the disc 20 does not rotate. When the optical disc drive starts to work, the rotation index 30 is driven by the rotation driving device 35, so that the gears 3 3 and 3 52 which are close to each other can perform high-speed rotation movement on the central axis A-B of the gear, and the rotation index 3 At the same time of high-speed rotation, the optical component and translation device will perform high-speed rotation movement with the rotation index 30, and the focusing device inside the rotation index 30 will also rotate in synchronization with the movement; at the same time, the movable mirror 41 and the weight 42 can be The left and right directions (along the CD direction) are linearly reciprocated on the rotation indicator. At this time, the entire rotating structure is maintained in a balanced state; the fixed reflector 40 is only synchronized with the rotation indicator 30.

594678

Speed rotation to protect the bathroom i + c ^ i explode ^ ^ ^ ^ nf "The relative angle of the moving mirror 41 is not small: ::: 0 The light beam emitted is first reflected by the fixed reflection to the reflection of 17 movement Mirror 41, which is converged on the disc 20 through the focusing lens 4 14. The light beams reflected from the reflection layer of the disc 20 pass through the μ mirror 414, the movable mirror 41, and the fixed mirror 40 in order. Be

: When the head is received, that is, when the rotating index 30 rotates and moves at a high speed, the reflection brother 41, the focusing lens 414, and the balance weight 42 make a linear reciprocating motion ^, the light beam emitted by the clock head 7G enters the fixed mirror 4 () The incident angle of 2 will be changed. Similarly, it is reflected by the fixed mirror 40 and then incident on the movable mirror 4 = the incident angle is also changed. The nine beams reflected by the reflective layer of the disc 20 are also unchanged. The light path is received by the laser head 70 and transmitted to the control circuit board 80 for processing via the data line 81. In addition, the same high-speed rotation of gears 33 and 352 driving the rotation index 30 does not affect the hollow transmission 5G installed concentrically with gear 33. Because gear 33 and gear 352 play a clearance fit, the friction between the two is sufficiently small, such as When the gear 33 drives the movable mirror 41 and the weight 42, the rotation of the gear 33 is not affected.

The linear reciprocating motion of the movable mirror 41 and the balance weight 42 is driven by the translation device. The 'servo motor 53 drives the gear via the gear 531', 52, and the rack 15 424, and converts the rotation of the servo motor 53 into a movable reflection. The synchronous linear reciprocating movement of the mirror 41 and the balance block 42 moves at the same time as the movable reflection moves, and the balance block 42 simultaneously adjusts in the opposite direction at the same time to ensure the dynamic balance of the rotation index 30. At both ends of the rotation index 30 Let the light suspension wheel 34 use CD as the axis for continuous rotary motion,

594678 V. Description of the invention (10) When moving, the outer edge of the light suspension wheel 34 is in contact with the inner wall of the annular limiter device 36. Its role is to prevent the rotation index 30 from generating excessive jitter and excessive deflection when rotating at high speed. . At the same time, the rotation index 30, the movable mirror 41, the fixed mirror 40, and the balance weight 42 are all streamlined in shape to reduce the air resistance they receive when rotating at high speed. = The focusing process is described below. Focusing error in 70% = (same as the existing 'illustration not shown') In comparison with the detection of focusing, after passing through the control circuit board 80 ° = error, the signal is amplified, and the signal is separated and reflected. A good focus error signal sends a focus drive voltage after adjustment, and then passes through a drive circuit to the ^ = coil 61, and the focus coil 61 generates a magnetic field and a magnetic field interaction between two: long-term magnetic contact, Move the focus coil to focus; at the same time, also adjust the balance of ㈣, the upper and lower mirror moves 414, to ensure the dynamic balance of the rotation index 30. "Moving up and down month" J describes the circuit that controls the focus signal and controls the focus lens of the laser head during surgery. The "two-in-one" technology has issued new chips and processing circuits. The circuit is the same and does not need to be restarted. In addition, the control adopted by the present invention is the same. The original circuit board controls the disc 20, the plate 80, and the prior art to keep the finger fingers rotating. The original circuit board is pressed: the circuit is used to control the reciprocating movement of the rotation line. The circuit is used to control the rotation. Movable mirror

Page 13 594678 V. Description of the invention (11) 41's linear reciprocating motion, so it does not work well. The film is made into: a new control circuit and a new transmission should be developed; the disc and laser head provided by the invention are stationary. Non-moving, moving device (-), low-inertia optical disc drive () that can transfer media to achieve instant convergence in low-inertia optical disc drives, small component mass, easy control, simple structure: low cost Traditional optical disc drive devices have produced conventional solutions, such as lack of conventional energy, heat loss, etc., and propose effective solutions and designs that have not been used for the second time. They have already met the application requirements for invention patents. We will examine them in detail and grant patents. With AirPlus, you will feel good. 』_Public, the technology, illustrations, and formulas described above are only the preferred embodiments of the present invention; they are just the same; for example, only # m are equal changes made according to the technology of the patent scope of the present invention or Modification or extraction of some functions, works, all are still within the scope of the patent rights of the present invention to limit the scope of the implementation of the present invention. Lm it knife Page 14 594678 Schematic description Schematic description: Figure 1 is a schematic diagram of the disc installation device of the present invention; Figure 2A is a schematic side view of the rotation index structure of the present invention; Figure 2B is Top view of the invention's rotating index structure; Figure 3A is a schematic side view of the translation device of the present invention; Figure 3B is a schematic top view of the translation device of the present invention; Figure 4A is a schematic view of the focusing actuator according to the present invention; FIG. 4B is an enlarged view of the EE section of FIG. 4A, and FIG. 4C is an enlarged view of the FF section of FIG. 4A; FIG. 5 is a schematic diagram of a specific embodiment of the present invention. Description of drawing number: 10-disc fixing device 11-disc mounting upper pressing device 12-disc lower support 20-disc 30 rotation index 31 transverse slot 32 hole 33 gear 34 light suspension wheel 35 rotation driving device 3 5 1 drive motor

Page 15 594678 Brief description of the drawings 352 Gear 36 Ring limiter device 40 Fixed reflector 41 Movable reflector 411 Slider 41 2 Moving plate 41 3 Shaft sleeve 41 4 Focusing lens 41 5 Rack

42 Balance weight 421 Slider 422 Moving plate 423 Shaft sleeve 424 Rack 50 Hollow transmission 51 Upper gear 52 Lower gear 53 Servo motor

5 3 1 Gear 6 0 Rigid slider 61 Focus coil 62 Spring 6 3 Permanent magnet 6 3 1 hole

Page 16 594678

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Claims (1)

/ 、、 Applicable patent scope h — a kind of low inertia optical disc a displacement device and a renrenxun device (1), including the optical component straight 2 3 the rotation index to control the rotation of the optical component and the control head to emit # ▲ Opposite reciprocating translation device for changing the position of the laser-optical C-chip; beam transmitting member; ', sigh on the rotation index as the light emitted by the laser head: sheet: drive the aforementioned optical member for slight displacement , So that the light spot energy) = f low-inertia optical disc drive device (-measure hi: the index is set under the read and write surface of the disc, it is equipped with an integrated gear. Protruded below the hole There are 3). Low-inertia optical disc drive device as described in Item 1 of the scope of the patent (-Qingzeng County, private ,, Γ each government has a lightweight suspension wheel, the moving mass ninja wheel; ^ The horizontal central axis of the rotation index can be used for continuous rotation. 4. The low inertia optical disc drive device described in item 3 of the scope of patent application (a floating wheel is rotated on a ring-shaped limit device and connected to it). The slave turn indicator passes when spinning at high speed And the appropriate deflection control. 5. Low-inertia disc drive wear-out as described in item 1 of the patent application scope (a) 'wherein the rotation index is controlled by a rotation drive device, the rotation drive The device is constituted by a driving motor combined with #wheels, which is coupled to the gear described in item 2. Page 18 ) 'Among them, the focusing device includes: two rigid slides, which are located inside the rotating index and the moving track of the balance weight and control the upper and lower = are movable mirrors-Xie Se, Tzu Chan > Displacement linkage, one end of this rigid b-set is set in the focus coil,. ^ Is in the aforementioned slide bar; the other end is the periphery of the other set of moving lines; one of the focus coils outside the rotation index is set in The two permanent magnets in the rotating indicator are hollow, and are set on the upper and lower sides of the relative focus coil value; the magnetic field generated by the ^ focus coil and the magnetic field between the two permanent magnets interact with each other {the focus coil generates a vertical displacement, Drive the rigid slide rail to move up and down 'to make the movable mirror focus instantly. 12. The low-inertia optical disc drive device (1) according to item η of the patent claim, wherein four springs are arranged below the focus coil, and a restoring force is provided after the focus coil is actuated to return the focus coil to its original position. 13. The low-inertia optical disc drive device (1) according to item 11 of the scope of patent application, wherein the rigid slide rail is a C type. Page 20