TWI234146B - Continuous flexible connection method for miniature optical head - Google Patents

Abstract

An optical assembly includes a service loop extended from a focus section of an actuator arm. A portion of the service loop bends when a tracking section of the actuator arm rotates around a tracking axis while a portion of the flex circuit twists when the focus section of the actuator arm rotates around a focus axis. A method is provided to predict the shape of a service loop that will not rotate the actuator arm from a resting position. The method uses a number of deflected beam elements to simulate the service loop under simple beam theory. In order for the actuator arm to remain in the resting position, the method assumes that the service loop applies an equivalent force to the actuator arm through the rotation axis of the actuator arm. Another method is provided to calculate the restoring torque exerted by the service loop when the actuator arm is rotated from its resting position. The method again uses deflected beam elements to simulate the service loop but assumes that the service loop applies a force that is offset from the rotation axis of the actuator arm.

Description

Case No. 90123759, 1234146 Amendment V. Description of the Invention (1) Technical Field The invention relates to a system for connecting an optical head to other electronic components in an optical drive. Prior art A conventional optical disc drive (for example, an optical disc player) usually includes an optical unit, a movable optical unit, and an actuator. Static light: The unit generally contains a laser diode, a beam splitter (half—

mirror), — light detector. Laser diodes are generated—the beam is reflected by a mirror onto the movable optics 7G. A movable optical unit is usually included to focus a light beam on a rotating optical disc. Which mirror actuator traces the track of the movable optical unit and the disc (track makes the beam return from the lands and pits of the track, and then the beam returns through the movable optical unit and returns to the stationary optical single beam. The mirror is sent to the photodetector and converted into an electrical signal at the intensity of the photodetector's variation. 'The leading optical disc drive is getting smaller and smaller, enabling it to be integrated into laptops and personal digital assistants (PDAS)] : Σ it includes

Compact disc drive. For example, the above: The stopping and moving optical unit may integrate an adult scale, an optical pickup unit of the optical pickup unit I, or, 〇piJ //: 罝 1-2 integrated optical head). Optical pickup The optical unit must be installed one by one to position the optical pickup unit on a small actuator arm of the rotating medium. The miniaturization of the small-sized g drive above the trajectory for carrying to and from the optical sensor, page 6 SS 90123759 1234146 Amendment V. Description of the invention (2) New design constraints are imposed on the flexible circuit of the signal. Depending on the shape of the flexible circuit and its position from the arm of the second actuator, it may restrict or hinder Jade Optics. The movement of the actuator arm of the unit. Therefore, an optical pickup unit is connected to other electronic components of the optical disc drive n and the combination = hinders the movement of the actuator arm. In one embodiment of the present invention, an The optical assembly includes a bottom actuator arm. The actuator arm includes a tracking section pivotally connected to the wire with a tracking axis rotating center and a -focusing section with-focusing axis as a rotation = center pivoting to the tracking Paragraph. A job A belt (service 100p), the base end of which extends from the focusing section, and the end of one of the working ring belts is mounted on the bottom plate. When the tracking section rotates around the tracking axis, the working belt At least a part is bent. At least a part of the garment working ring is twisted when the focusing section is rotated about the focusing axis. In another embodiment of the present invention, a work is proposed to predict a work that does not turn the actuator arm from a rest position. Method of endless belt shape. This method simulates the shape of the working endless belt by several beam elements flexed by the actuator arm. In order to keep the working endless belt from turning the actuator arm, the method assumes that the actuator arm passes through: The axis exerts a first-class effect. A user provides a mounting point (the point at which the first end of the working belt is mounted on a base plate), a mounting angle (the angle at which the second belt of the working belt is on the bottom plate) Starting point (the point at which the second end of the working ring is mounted on the actuator arm), the departure angle (the angle at which the second end of the working ring is mounted on the actuator arm), the total number of beam elements, and the beam = strength The user also provides the beam length and actuation Χ and Y cents of the force exerted by the arm $ 7 Page 1234146 Case No. 9012tT7SQ V. Description of the invention (3) The initial value of the threshold value. This method calculates a starting position and an initial angle (for the beam at the beginning of each beam element). Orientation angle), a final position, and a final angle (the final orientation angle of the beam under deflection). If the final position and angle of the last beam member do not match the desired final position and angle of the working ring ' Repeat the above steps with a new value for at least one of the beam length and the X and γ component values. In another embodiment, a method calculates the restoring torque when the actuator arm turns away from its rest position. Different In the aforementioned method, this method assumes that a torque centered on the axis of rotation exists. In an implementation case, 'the moment centered on the rotation axis is expressed by the product of the γ component and its X-direction offset to the rotation axis. Therefore, the user provides the offset of the γ component and the initial values of the X and Y component values. The user also provides the starting point of the installation point 'installation angle', departure angle, total number of beam elements, beam stiffness, and beam length. This method calculates a starting position, an initial angle ', a final position, and a final angle for each beam element. If the position of the last beam element does not match the desired final position and angle of the working zone, the method repeats the above steps with new values for at least one of the offset of the gamma component and the values of the X and Y components. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a side view of an optical assembly. The first figure A is an exploded view of an optical assembly according to an embodiment. … A ^^ '' is a side perspective view of the assembly of the second picture A. The first modification is a view of an optical pickup unit (〇PU) of the assembly of the second picture A. The fourth picture A, the fourth picture B, the fifth picture A, and the fifth picture B are the general sides of the second picture A

1234146

At; 90123759. V. Description of the Invention (4) Sectional views in different implementation cases. The sixth figure is an exploded view of an optical assembly according to another embodiment. The seventh figure is a side view of the sixth figure assembly. Figure 8 is a perspective view of an arm of an optical assembly and the operation of a flexible circuit. I-band The ninth picture A and the ninth picture B are the clockwise and counterclockwise sides of the arm. A perspective view of the bending state of the working endless belt when rotated. M direction Tenth pictures A and B are perspective views of the twisted state of the work band when the arm is turned up and down. The eleventh figure is a flowchart of a method for determining the method according to an embodiment of the present invention that does not allow the worker to turn the actuator arm away from a rest position. In the text, the circuit = the figure is used to explain the tenth-graph method of the actuator arm and the angularity;! Test the twelfth method method of the shape of the working ring zone :: fίf an implementation of the present invention Example-A flowchart of the actuation method when the actuator arm is turned to the outer stop position. The decision-making method for moving W from the working belt. Use the same reference symbols in different drawings to represent similar or identical objects.

Ml ^ £ ^ 0 (or a disc optical pickup unit 2. An electronic component connected to a -print --- ^ actuator) 1 〇. Light

Page 9 1234146

No. 1 9012.T7RQ V. Description of the invention (5)

Learn to mount on a copper plate 30 through a notch in a fiberglass layer 40. The glass fiber layer 40 includes a pad 42 and two of the pad 0 = 2,4. The solder joint 42 is lightly connected to the solder joint 22 of the first child or the early 7020 via a bonding wire 25. The board 30 is mounted on a flexible circuit 50 (or vice versa). The flexible circuit 50 includes a solder joint 52, a trajectory W, and a connector 56. The solder joint 44 of the glass fiber layer 40 is connected to the solder joint 52 of the flexible circuit 50 via a solder joint. The flexible circuit 5 is then connected to a printed circuit board 6 via a connector 5 =. w 面 = 1〇 # Each defect in Q assembly 1 () — bonding leads and solder joints ^ constitute a failure point that may break in use. As a result, the numerous bond wires and solder joints within her 10 created many failure points. : Taxi Bonding leads and solder joints must be formed during the manufacturing process. Therefore, so many bonding wires and solder joints increase the manufacturing cost. Solder joints also require large solder joints, which increases the overall size of the fiberglass layer and the flexible circuit layer. The assembly 10 is also composed of multiple layers of silicon, fiberglass, copper, and flexible circuits that increase the overall weight and volume of the disc drive. Therefore, there is a need for a method and system that improves reliability and minimizes weight and volume while connecting the optical pickup unit to other electronic components of the optical disc drive. The second figure A and the second figure B depict an embodiment where the light 100 〇Ilf (OPU) 104 is positioned above a trajectory of a rotating medium 330 (shown in the third figure). The optical pickup unit 104 reflects a light beam from the track and converts the reflected light beam into an electrical signal. A flexible circuit (flexible circuit)! 〇6 through a direct bonding wire 116 (shown in the second figure B) connected to the optical pickup unit 104 is connected to the &## > [sign, thereby not using an intermediate glass fiber layer and its related interface

IIM page 10 5. Description of the invention (6) Two leads. The flexible circuit 106 transmits this electrical signal to a printed circuit board 120 (or any other electronic component) for further processing. The flexible circuit 106 also transmits control and power signals from the printed circuit board to the optical pickup unit 104. A heat-conducting plate (a heat sink is mounted on the optical pickup unit 104 to heat the heat generated by the optical pickup unit 104) Diffuse to the environment (such as ambient air and components). As shown in the second figure B, the flexible circuit 106 is mounted on top of the board 108. The board 108 must be made of a variety of thermally conductive materials, including aluminum, yellow, Carbon fiber composite, copper, gold, graphite, steel (stainless steel or other corrosion-resistant steel). Those skilled in the art should understand that the plate 108 can also be made of an alloy of the metals listed above. The flexible circuit 106 is an example. It is a Kapton flexible circuit with gold or copper tracks. In some embodiments, the flexible circuit 106 is bonded to the board 108 using a thermally conductive adhesive 130. The adhesive 13 includes pressure-sensitive adhesive. Adhesives, acrylic adhesives, epoxy resins, structural epoxy resins, anaerobic adhesives, UV-curable adhesives, caulk adhesives, and capillary adhesives. Adhesive 130 may include a thermally and / or electrically conductive adhesive. Fillers (e.g. metal powder, metal fibers Carbon fiber, carbon powder, and carbon fiber). In some implementation cases, the flexible circuit 106 and the board 108 are manufactured with respective alignment holes 109 and 111 (second picture A) to make the flexible circuit during the installation process. The flexible circuit 丨 〇6 is positioned correctly with respect to the board 108. The flexible circuit 1 06 and the board 108 are positioned correctly at the corresponding alignment holes 〇09 and 111. In some embodiments, the flexibility Circuit 1 06 includes a gap 丨 丨 (second picture A). In these embodiments, the optical pickup unit 〇 04 passes through the gap 丨 j 〇 and is mounted on top of the board 108. For example, the optical pickup unit The 104 series uses a thermally conductive adhesive 1 3 2 to adhere to the board 1 08. Therefore, the optical pick-up unit 1 042 1234146 ^ Amendment Case No. 901237M V. Description of the invention (7) It is fixedly attached to the board 108 It is in a fixed position relative to the flexible circuit 106. As shown in the third figure, the optical pickup unit 104 includes a light source 302 supported on a support 304. The light source 30 is an edge emission, for example. Laser monopole. The holder 304 is mounted on the primary holder (wafer) 306. The secondary holder 306 is an integrated circuit crystal. In a semiconductor process, it is formed as a light detector 332 for collecting data and controlling laser power and servo mechanism, and a wire detector 332 for wire bonding, a laser 302, and a Modulate the solder joints 114 and wires of an optional oscillator chip (not shown) of the laser 302.

An optical element (OE) block 308 is above the light source 302, which must include lenses, grids, holograms and other optical components or devices. The optical element block 308 diffracts a part of the laser light to a laser power control light detector (not shown) and shapes the laser beam as required. The spacers 310 and 312 are sandwiched between the sub-mount 306 and the optical element block 308 '. One side of the spacer 3 1 0 has a 45 degree turning mirror 314 to refract the horizontal light beam generated by the light source 302 into one. Vertical upward direction.

A stack 316 is mounted on top of the optical element block 308, and is made of a material that transmits a light beam emitted from the light source 302. The prism 316 is made of, for example, fused silica or lead glass (SF 2). The end of the prism 31 (lateral surface) is inclined at an angle of about 45 degrees with respect to the horizontal and is coated with a substantially reflective coating such as aluminum or silver to form the turning mirrors 318 and 320. The prism 316 also includes an internally polarized beam splitting surface (beamsplitter) 3 2 2 inclined at an angle of about 45 degrees with respect to the horizontal. Internally polarized beam separation surface 3 2 2 is approximately reflective for primary polarized light (that is, page 12 1234146 V. Description of the invention (8) uses the same mirror) and is approximately transmissive for secondary polarized light. A quarter wave plate 324, a lens spacer 326, and an objective lens 328 are on top of the 稜鏡 316. The third figure also shows a cross section of an optical medium 330 a predetermined distance from the objective lens Mg. Like the conventional optical head unit, the light beam emitted by the light source 3 02 follows a forward path to the optical medium μ 0, and the light beam is reflected along a return path at the optical medium to the light detection in the sub-mount 306.器 332. In some embodiments, the secondary socket 306 is first mounted on the top of the plate 108 through the notch 110 of the flexible circuit 106. A precision optical calibration tool must be used to position the sub-mount 306 relative to the plate 108 via a reference hole (t00ling or f test surface) formed in the sub-mount 306 and the plate 108. Then, The other components are mounted on the top of the sub-mount 306. Once again, a precision optical calibration tool must be used to position the components of the optical pickup unit 104 during assembly. For other details about the optical pickup unit 104, see 1 ggg U.S. Patent Application No. 09 / 4571〇4 filed on December 7, 2010, L0w Profile Optical Head, and U.S. Patent Application No. 09/544370 filed on April 6, 2000, , System and Method For Aligning

Components of 0ptical Head 〃, these two applications are incorporated herein by reference in their entirety. > Referring back to Figures 2A and 2B, the flexible circuit 106 and the optical pickup unit 104 include respective contact pads 112 and 114, which are used to: transmit and receive electrical signals. The cable on the flexible circuit 106 is the optical pickup unit 104 of the door 3 driver, and the printed circuit board 1 2 0 = 2 / control and power signal. Therefore, the bonding wire 116 provides a direct connection between the ___ and the A-sensor unit 104. 13 Page 13 1234146 ^-End number% 1 test _ year month a. Article 5. Invention Description (9) " An optical pickup unit 1 〇 04 and flexible circuit 1 〇 6 use direct wire bonding to improve The reliability of the interconnection is improved because there is no intermediate layer (such as the fiberglass layer 40 of the first figure) that may be broken. The use of direct wire bonding also helps to eliminate the need for an intermediate layer, thereby reducing the overall weight and volume of a compact disc drive. Eliminating the intermediate layer will further reduce the weight of the optical pick-up unit 104, allowing the actuating arm 102 to easily control it.

Referring to the second figure A, the optical pickup unit 104 is mounted on one of the fork-shaped portions 118 of the actuator arm 102. The optical pick-up unit 104 is, for example, adhered to the shaped portion 11 8 by a thermally conductive adhesive. In some embodiments, the optical pickup unit 104 is positioned relative to the mating surface on the actuator arm 102 by one or more edges of the sub-mount 306, the optical element block 308, or 稜鏡 316. Positioned in the X and y directions and positioned at the mounting position with the top surface of the flexible circuit 106 or the board 108 positioned relative to the mating surface on the actuator arm 102 in the z direction. Parts of the board 108 and the flexible circuit 106 are mounted on the bottom surface of the actuator arm 102. For example, the component 208 of the plate 108 and the component 206 of the flexible circuit 106 are adhered to the bottom surface of the actuator arm 102 using a thermally conductive adhesive 134. Since the board 108 and the flexible circuit 106 are mounted on the optical pickup unit 104, they are positioned correctly with respect to the actuator arm 102 when the optical pickup unit 104 is mounted on the fork portion 118.

In some implementation cases, the shape of the component 206 and the component 208 are different, and when the component 206 is mounted on top of the component 208, a part of the component 208 is covered by the component 206. In these embodiments, a thermally conductive adhesive 134 is applied over the uncovered portions of component 206 and component 208. The fourth figure A is a cross-sectional view taken along a line A (second figure b) of one of the implementation cases of the assembly 100. As shown in the fourth figure A, the thermally conductive adhesive 134 provides a gap between the uncovered part of the part 208 and the actuator arm 102 when the part 20 8 is adhered to the bottom surface of the actuator arm 102.

Page 14 1234146 _ SS_J〇123759 V. Description of the invention (10) 1 Special heating path 402. Of course, heat is also conducted by a path through the part 206 between the covered part of the part 20 08 and the actuator arm 1. By forming a conduction path from the optical pickup unit 104 to the component 208 and the actuator arm 102, it is possible to dissipate heat to the environment via the surface area of the plate 208 and the actuator arm 102 (for example, like Path 406). In the implementation case shown in the fourth figure b, the plate 208 (or any other part of the plate 108) may have one or more protrusions or ears 408 passing through the component 206 (or the flexible circuit 10). 6 in any other part) directly contact the actuator arm 102 to provide an additional conductive path between the plate 108 and the actuator arm 102. In other implementation cases, the shape of component 206 is such that component 208 is completely covered when component 206 is mounted on top of component 208. The fifth figure a is a cross-sectional view taken along the line A (second figure b) of one of the implementation cases of the assembly. As shown in the fifth figure A, the component 20 contacts the actuator arm 102 only through the component 20 6. Therefore, the thermal energy from the optical pickup unit 104 is introduced into the actuator arm 102 from the component 208 of the board 108 through the component 206 of the flexible circuit 106 through a path 502. By forming a conduction path from the optical pickup unit 104 to the board 108 and the actuator arm 102, heat can be dissipated to the environment via the surface area of the board 108 and the actuator arm 102 (e.g., like (Path 5 〇6). In the implementation case shown in Figure 5b, the plate 208 (or any other part of the plate 108) may have ~ or more protrusions or ears 408 through the component 206 (or any of the flexible circuits 106) The other notches) directly contact the actuator arm 102 to provide an additional conductive path between the plate 108 and the actuator arm 102. The sixth and seventh figures depict another embodiment of the optical pickup assembly 600 °. Although similar to the optical pickup assembly 100, the optical pickup assembly 600

Page 15 1234146 Case No. 90123759 Birth date _ ^ 5. Description of the invention (11) On top of Road 606. The plate 608 is, for example, adhered to the top of the flexible circuit 606 using a thermally conductive adhesive 630. In some embodiments, the flexible circuit 606 and the board 608 are manufactured with respective alignment holes β09 and hi to correctly position the flexible circuit 606 with reference to the board 608 during installation. An optical pickup unit 604 is then mounted on top of the board 608. The optical pickup unit 604 is, for example, adhered to the board 608 using a thermally conductive adhesive 632. Therefore, the 'optical pickup unit 604 is firmly attached to the board 608 and is in a fixed position relative to the flexible circuit 606. In some implementation cases, the optical pickup unit 604 has the same structure as the optical pickup unit. The flexible circuit 606 and the optical pickup unit 604 include respective contact pads 612 and 614, and these contact pads are transferred via bonding wires 616 (seventh figure)

And receiving electrical signals. In some embodiments, the board 608 includes a notch 610 to allow the bonding leads 616 to pass through the contact pads gig and 614. The trajectory on the flexible circuit 606 is used to carry data, control and power signals between the optical pickup unit 64 and the printed circuit board 120 of the optical disc drive.

The optical pickup unit 604 is mounted on one of the fork portions 618 of the actuator arm 602. The optical pickup unit 604 is, for example, adhered to the fork portion 618 with a thermally conductive adhesive. A board 608 connected to a flexible circuit 606 is mounted on the bottom surface of the actuator arm 602. For example, the component 708 of the plate 608 is adhered to the bottom surface of the actuator arm 602 using a thermally conductive adhesive 634. The optical pick-up unit 604, the flexible circuit 606, and the board 608 can be positioned in a relative relationship with each other as described in the foregoing assembly. The eighth figure depicts that the actuator arm 〇 02 includes a tracking section 804 pivotally connected to a bottom plate 801 with a tracking axis 80 6 as a rotation center. The tracking section 804 is, for example, mounted on the base plate 80 through a bearing set 805. A focused segment 808

Page 16 T234146

The focal axis 8 10 is pivoted to the tracking section 804 as the rotation center. The focusing section 808 is, for example, joined to the tracking section 804 via a hinge 809. Optical pickup single Niu Yuan, 104 women's clothing at 1 Jiao ^ another end. The tracking section is rotated around the center of the tracking axis MB rabbit and the optical pickup unit 1G4 is placed above the trajectory of f33Q (figure " ^^). At the same time, the focusing section 808 is rotated around the focusing axis 810 to make the learning unit 丨04 focus on the trajectory of the medium 33. According to the implementation method, the tracking axis 8 06 and the focusing axis 8 10 must intersect. For other details about the arm 1 02, see April 25, 2000. U.S. Patent Application

09/557284, TILT FOCUS METHOD AND MECHANISM FOR AN OPTICAL DRIVE, the case is incorporated herein by reference in its entirety. In an implementation case, the rotation angle of the tracking segment 804 is 10 to 20 degrees in either direction (clockwise or counterclockwise), and the rotation angle of the focusing segment 008 is either direction (up or down). 0.25 to 1.5 degrees. In an implementation case, the distance from the tracking axis 8 to the objective lens of the optical pickup unit 104 is 10 to 30. The distance from the focusing axis 81 to the objective lens of the optical pickup unit 104 is 1 0 to 30 mm. A working loop 802, one of the flexible circuits 106, extends from the arm 102. The work loop 802 includes a base end 812 extending from one of the starting points 1 2 08 near the axes 806 and 810 (see Figs. 9a, 9B and 12). In one implementation case, the base end 812 extends from the starting point 1 208 on the focusing section 808. In some implementation cases, a plurality of working endless belts 802 need to protrude from the arm 102. Multiple working loops may be required due to physical limitations due to the number of signals traveling to and from the actuator arm 102 and the size of the disc drive. One end 814 of one of the endless belts 802 is at a mounting point 1 206 (see figure 9)

Page 17 1234146 Qni ^ 759 January _ V. Description of the invention (13) A, ninth figure B and twelfth figure) Firmly installed on the bottom plate 801 causes the endless belt 802 to be arc-shaped (eg, draped). The endless belt 802 is oriented so that the width (flexible width) of the focusing section 808 is vertical when it is laid flat. The ninth figure A and the ninth figure B respectively show that the endless belt 802 is bent and straightened when the tracking section 804 rotates in the first and second directions with the tracking axis 806 as the center. The endless belt 802 is preferably made of a low elastic modulus material. The endless belt 802 is, for example, made of polyimide, such as a conventional K a p t ο η flexible circuit. The length of the endless belt 802 is much larger than its width and thickness. In an implementation case, the endless belt 802 is 26 mm long, 2.5 mm wide, and 0.07 mm thick. These characteristics allow the loop 802 to bend easily (for example, the loop 802 has a low bending spring constant). Therefore, the endless belt 802 imposes minimal constraints on the rotation of the tracking section 804 centered on the tracking axis 806. The base end 81 2 is also attached to the arm 102 near the tracking axis 8 0 6. The position of starting point 1 208 makes the endless belt 802 exert a small force on the arm 102 by a small force. Therefore, the endless belt 802 does not interfere with the movement of the tracking section 804 with the tracking axis 806 as the rotation center. The tenth figure A shows how the endless belt 802 is twisted when the focusing section 808 is rotated with the focusing axis 810 as a center in a first direction (for example, upward). As segment 808 turns up, the base end 812 is raised and the distal end 814 remains stationary. The movement of the section 812 twists the endless belt 802. Similarly, the tenth figure B shows how the second belt 802 twists when the focusing section 808 is rotated around the focusing axis 810 in the directions of one and two. When the section 80 8 turns down, it lowers and the end m remains stationary. Base section 8 ^ = 12 802 twisted. You dandan-people make% belt ^ As mentioned above, the ring has a low elasticity Yes ...

Page 18 1234146 90123759 _ year month day correction __ five, the description of the invention (14) degrees. These characteristics allow the endless belt 802 to be easily twisted (for example, the endless belt 802 has a low torsion spring constant). Therefore, the endless belt 802 does not restrict the rotation of the tracking section 804 about the tracking axis 806 as the center. The base end 8 1 2 is also attached to the arm 102 near the focus axis 8 1 0. The position of the starting point 1 208 makes the mechanical benefit of the belt 802 exerting a force on the arm 102 small. Therefore, the endless belt 802 does not interfere with the movement of the focusing section 808 with the focusing axis 81o as the rotation center. The eleventh figure is a method 11 for determining the shape of the working belt that does not allow the working belt 802 to turn the actuator arm 102 from a "predetermined position (,, rest position") above the mass 3 3 0. The rest position is selected so that the tracking motor current required for the actuator arm 1 2 to resist the working ring belt 80 2 turning toward the inner diameter (ID) is approximately equal to the actuator arm 1 2 resisting the working ring Belt 8 0 2 Tracking motor current required to turn towards the outer diameter (0 D). This minimizes the maximum current and maximum motor torque requirement of the tracking motor in the disc drive. In an implementation case, this rest position will The actuator arm 102 is placed above the diameter (MD) between the media 33 °. 'Method 1100 starts with a first end of one of the working bands 802 at a predetermined point (' mounting point 'and angle (', mounting angle "). Method 1 100 extends the working belt 802 outwards in small sections to meet the actuator arm 102 (starting point at a predetermined point j) and angle (departure angle "). Method ^ will be a mother The small section is considered to be subjected to a force and moment applied to the end of the element by simple beam theory. A simple beam element that is curved. By putting many short 2 together, the method 1100 can accurately predict the shape of the working zone 802. Those skilled in the art understand that the working zone 802 Set off

Page 19 1234146 Case No. 90123759 __Year Month Day ___ V. Description of the invention (15) 1208 Force 1210 (Figure 12) applied to one of the actuator arms 102 and-Torque 1 211 can be applied to the actuator One of the points on 1 0 2 has the same effect and moment (such as the force 1 2 1 2 and the moment 1 2 1 3 at the axis 8 0). The magnitude and direction of the force 1212 is constant, while the magnitude and sign of the moment 1213 depends on the position of the selected point. Method 11 〇〇 Assume that the equal effect 1212 and the moment 1213 at the tracking axis 8 are composed of constant force 1212 and a zero (〇) value moment 1213, so that the synergistic effect of the two will not tend to make the actuator arm 1 〇2 Rotates around the tracking axis 806. In order to calculate the deflections of the simple beam elements that together constitute the working belt 802, the actuator arm 102 is applied to the working belt 802 at the starting point 1208—a force of 1 21 4 and a torque of 1 21 5 are applied to the work. One of the points on the annulus 8 0 2 has an equivalent effect and moment (for example, an equivalent effect 1 21 6 and a moment 1 21 7 at point 1 21 8). The force 1216 applied to the working ring 8 2 at any simple beam element is equal in magnitude and opposite in direction when compared with the force 1212. The moment applied to a selected beam element 21 7 can be calculated from the force 2 2 6 and the position of the simple beam element on the selected working loop 802. The force 1 2 1 6 and the calculated moment 丨 2 1 7 applied to a selected beam element within the working loop 802 will cause the element to deflect. Therefore, the completion of the work belt 802 can be determined by calculating the amount of deflection caused by the force 12i6 and the calculated moment 1217 of each beam element in the work belt 802. The method called 11 00 starts at the first end of the working belt 802 and determines the elbow of the _th component beam element by applying a force of 1216 MPa to a moment of 1217 to the element. : The beam element is connected to the predetermined installation point at a predetermined installation angle. Method U 0: count: deflection of a female beam element *, connect this element to the second end of a subsequent beam element and weigh each simple beam element ^ to form a working loop 80 2 '

Page 20 1234146 Case No. 90123759_Yan Yue—Amendment ___ V. Description of Invention (16) Repeat this procedure. In addition, the method 1 1 0 0 takes the magnitude and direction of the force 1 2 1 6 (for example, changes the magnitude of the X and Y components of the force 1216) and the common length of the individual simple beam elements that collectively constitute the working belt 802 (,, Liang Changxuan) Adjusted to the values corresponding to the mechanical dimensions and characteristics of the material constituting the working belt and the intended installation point, installation angle, starting point and departure angle. Generally speaking, a user sets (1) the starting point (such as the X and Y coordinates), (2) the departure angle, (3) the mounting point (such as the X and Y coordinates), and (4) used to simulate the working ring 802 The number of beam elements, and (5) the bending modulus of the beam elements (such as the stiffness of the work band 802). The user also provides the initial values of the X and Y component values of (6) beam length and (7) force 121 6. The initial values of beam length and X and Y component values provided are only guesses. A computer can change one or more beam lengths and X and Y component values in an iterative process to arrive at a solution that places the end of the working belt 802 at a predetermined starting point and departure angle. In general, the large number of beam elements and trabecular lengths will result in accurate shape prediction of the working ring 802. Appendix MATLABTM by MathWorks of Natiek,

The MATLABTM computer program produced by Massachusetts is one of the implementation examples of Method i 100. Method 1100 begins with action 1102 (picture eleven). In action 1102, a user sets the starting point, departure angle, mounting point, mounting angle, number of beam elements, and beam stiffness. The user also provides initial values for beam length and force 1216iX and γ component values. Element) is the first beam element. If yes then action 1 104 followed by action 1106. Otherwise Action 11 04 is followed by Action 111.

First, in action 1104, the computer determines the current iterative beam element (, current beam 1234146

In action 11 06, the starting position (for example, the tenth computer sets the current beam element such as the & angle in the thirteenth figure is set to the first beam element and then action 111 4. The computer sets the mounting point as the current beam element. Point 1302 in the second figure). In action 1108, the angle (,, initial angle, orientated) at the beginning of the orientation ° Actions 1 106 and 11 08 will be the installation point and the starting position and initial angle of the installation. After action 丨 丨 〇 ^ In action, the computer is located at the end of the beam element from the previous iteration. For example, point 13 () 4 in the thirteenth figure is higher than the current position of the beam element. The beam element of the previous beam element is finally ^ ^ 0 0f in the thirteenth figure is set to the initial angle of the current beam element (eg 6 »s in the twelfth figure). Actions 111 and 1112 set the end position and final angle of the previous beam element to the starting position and initial angle of the current beam element. Action 111 2 is followed by action j i! 4. Decay In action 11 1 4 the computer calculates the bending moment at the end of the current beam element. In an implementation case, the bending moment is calculated as follows:

Mh where Xe and Ye are the coordinates of the end position of the current beam element that is not deflected (for example, point 1 303) 'X ^ αΥρ is the pivot coordinate (that is, the tracking axis 806) X ”is the moment arm of the X component, ( VYP) is the moment arm of the unitary component, and Fxe and Fy are the magnitudes of the X and γ components of the force 1216. x

Xe and 1 can be calculated by: ^ c, = ^. + Zcos (0)

Ye = YS + Lcos (0s)

V. Description of the invention In (18), L is the beam length, and Xs and Ys are the initial seats of the current beam element. In action 1116, the computer calculates the current from the bending moment:. (The difference between the initial angle and the final angle). In one implementation, the angle deflection element is assumed to be small enough to let the force χ and Y component # ^ 2 1 6, and these beam elements are negligible. Therefore, the equation of the angular deflection amount is:

EI where δ Θ is the amount of angular deflection and EI is the bending modulus (Liang Jinsheng ^ In action 1117, the computer uses the following formula from the initial l =. Different final angle of the current beam element: The angle deflection meter computer calculates the current beam element The beam elements are assumed to be negligible. The effect is negligible θρθ, δθ In Action 11 1 8 in an implementation case, the equation of the end position of these independent beam elements becomes: + Zc〇s (^ v) the end of the element Position. Let the beam deflection amount to one. Therefore, the beam end position η- where Xe, and Ye, point 1304):

Ys + Lcos (es) is the coordinates of the end position of the current beam element that has been deflected (for example, the element is in IT ^ 120 'The computer determines whether the current beam element is the last-Liang Zhide then act 1120 and then act 1122. Otherwise act Too much of 1120 ^ ^ Other actions 1110. This allows the computer to cycle through the entire method 1 1 0 before calculating the last beam element-and the final angle.

Page 23 1234146

Case No. 901237.RQ, Description of Invention (19) Amendment In action 1122, the computer determines whether the end position and final angle of the last beam element are approximately equal to the starting point and departure angle. If it is within a predetermined tolerance, then the end position and the final angle are considered to be approximately equal to the starting point and the departure angle. In the event of a discrepancy, action 1122 is followed by action H24. Otherwise Action 11 22 is followed by Action 11 2 8. In action 1124, the computer changes at least one of the beam length and force 1216 and the gamma component value. Action 1124 is followed by Action 1104. The computer cycles through the X and Y component values before it finds the beam length and force 1 2 1 6 that are approximately equal to the end position of the last beam element and the final angle of the starting point and departure angle. Method 1100. In action 1128 ', the computer ends method 1100 because it finds the end position and final angle of the last beam element at the starting position and one of the beam length and the force of the departure angle. The total length of the working belt 802 is the product of the beam length times the total number of beam elements. The working belt 80 2 will not turn the actuator arm 102 from its rest position if it meets the set point of safety, installation angle, starting point, departure angle, beam stiffness, and total judgement length. In the case of using the elbow man 1'1 ^ 6], method 1100 uses a function called Mminsearch " to find the final way by changing at least one of the X and γ component values of the beam length and force 1216 The minimum difference between the position and the end of a beam and the predetermined starting point and departure angle. 'After determining the shape of the work band 802, a method of 1400 (Figure 14) must be used to calculate the moment 1213 (,, Reset torque,,). This reset torque can be used to determine whether a rotary drive (e.g., a voice coil) has sufficient power to resist the working ring 802 from turning the actuator arm 102. The reset torque is also ^

1234146 Case No. _90123759 Amendment on the fifth day of the fifth invention description (20) " '-used to select one of the rest positions of the actuator arm 10 2 so that the actuator arm 丨 〇2 is within the medium 3 3 0 When the diameter or outer diameter rotates, it will cause equal reset torque. This minimizes the maximum current and maximum motor torque of the tracking motor in the disc drive. ^ Assuming that the reset torque is not zero, the moment exerted by the actuator arm 102 at any point on the working% belt 802 becomes the moment and the reset torque (that is, the torque) from the force in each beam element 1216.丨 2 丨 3). Therefore, the moment of actuation for the arm 102 turning away from its rest position at the end of the current beam element becomes ...

Mb = ~ (Ye ~ Yp) FX + [Xe-X p) Fy + Mr where Mr is the reset torque. In an implementation case, the reset torque is represented by a moment generated by the gamma component of the force 1212 (which has the same magnitude as the Y component of the force 1216) off the pivot point (trace, line 80 6). Therefore, the bending moment at any point on the working belt 802 becomes: A =-(K-+ k-X + L.e (Fy or

^, = ~ (Ye-^) FX + (xe -Xp + Loj] sct) Fy where L0ffset is the x-direction offset of the Y component from the tracking axis 806. Method 1 400 is the same as Method 1100 except the following points: 1) The starting point moves with the actuator arm 10 2 to the inner or outer diameter of the medium 3 3 0 (see Figure 9 and Figure A)

Page 25 1234146 Case No. 90123759 Month _ Amendment V. Description of Invention (21) (2) Replace Action 11 0 2 with Action 11 0 3 (see below) Action 3 1 1 1 4 Use a new equation (such as (4) Calculate the bending moment; (4) Replace action 1124 with action 1 125 (see below); and (5) at the end position and final angle of the last beam element approximately equal to the starting point and departure angle between actions 1122 and 1128 Intervening action 1126 (see below). In action 1103, the user provides the initial value of the offset of the Y component of the force 1 2 1 6 to the tracking axis 8 0 when the actuator arm 102 is located at the inner or outer diameter of the medium 330. The user also provides initial values for the X and Y component values of the force 1 2 1 6. The user sets the installation point, installation angle, number of beam elements, beam stiffness, and beam length using the values provided and determined in Method 1 100 previously. The user also sets the starting point and departure angle when the actuator arm 102 is located at the inner or outer diameter of the medium 3 30. In an implementation case, the user sets the rotation angle when the actuator arm 102 is located at the inner or outer diameter, and the computer starts and departs from the rotation angle of the actuator arm and the physical size. Go corner. In action 11 25, the computer changes at least one of the gamma component offset and the X and gamma component values. In action 11 2 6, the computer calculates the reset torque experienced by the actuator arm 102. This reset torque is obtained by the following formula: The case where method 1 400 is implemented by a maTLABtm computer program is shown in the appendix. In this MATLABTM implementation case, Method 1 40 0 uses the aforementioned 'Nfminsearch " function to find the end position and final position of the last beam by changing at least one of the γ component offset and the X and γ component values. Angle and Pre

1234146 Case No. 9. _ V. Description of the invention (22) Minimum difference between the starting point and the departure angle Although the present invention has been described with reference to specific embodiments, the M example of monthly application should not be regarded as a limitation. Lifting 1 0 0 and 1 4 0 0 can use the starting point as the opening of the working belt as the end position of the working belt. In addition, although only the computer is changed, more or fewer input parameters can be changed, such as the internal value of the life \ direction force and the offset of the beam length or heading force. In addition, although specific moments and deflections are proposed = other equations and permutations are included in the calculation [many of the features of the embodiments disclosed in this description, the scope of the invention defined in the following patent claims There are three changes to the calculation of torque outside the calculation of the torque, he modified within. The book is only for publication. The method is to input parameters by installation point. Let X be a parameter, so that and deflection and combination are both

Page 27 1234146 h — Case Sheng 90123759 Rev. — Simple illustrations Simple illustrations The first picture is a side view of an optical assembly. Figure 2A is an exploded view of the optical assembly of an embodiment. The second figure β is a side perspective view of the assembly of the second figure A. The third figure is a side view of an optical pickup unit (oop) of one of the assemblies of the second figure A. The fourth figure A, the fourth figure β, the fifth figure A, and the fifth figure B are cross-sectional views of the assembly of the second figure A in different implementation cases. The sixth figure is an exploded view of an optical assembly according to another embodiment. The seventh picture is a side view of the sixth picture assembly. The eighth figure is a perspective view of an arm of an optical assembly and a working band of a flexible circuit. The ninth figure A and the ninth figure β are perspective views of the bending state of the working band when the arm is rotated in the clockwise and counterclockwise directions. The tenth figure A and the tenth figure B are perspective views of the twisted state of the work band when the arm is turned up and down. FIG. 11 is a flowchart of a method for determining a starting point and a mounting point of a working belt which does not allow the working belt to turn an actuator arm from a rest position according to an embodiment of the present invention. Figure 12 is a top view of the actuator arm and holding circuit used to explain the method of Figure 11. The thirteenth figure is one of the tenth many beam elements used to predict. The fourteenth figure is a torque received by the actuator arm from the working ring when the actuator is out of its rest position according to an embodiment of the present invention;

On page 28, the shape of the working ring in the drawing method is 1234146 Case No. 90123759 Modified the schematic diagram of the method. The use of the same reference symbols in different drawings indicates similar or identical items. DESCRIPTION OF SYMBOLS 10: Assembly 20 > 604: Optical pickup unit η, 42 ^ 44, 52, 1 14: Solder joint (pad 25 > 616: Bonding lead 30: Copper plate 35: Welded joint 40: Glass fiber Layers 46, 54: trajectory 50 ·· flexible circuit 56: connector 60 ^ 120: printed circuit board 100 ^ 600: optical pickup assembly 102 ^ 602: actuator arm 104: optical pickup unit (OPU) 106 ^ 606: Flexible circuit (flexible circuit) 108 ^ 608: Thermally conductive plate (heat sink) 109 > 111 > 6 0 9, 6 11: Registration hole 110 ^ 610: Notch 112, 114, 61 2, 6 1 4: Contact pad

Page 29 1234146 Case No. 90123759 Simple description of the correction pattern 6 3 4: Thermally conductive adhesive 11 6, 6 1 6: Bonding leads 11 8, 6 1 8: Fork 130, 134, 630, 632, 206, 208 '708: component 3 0 2: light source 3 0 4: holder 30 6: sub-holder (wafer) 308: optical element (OE) block 31 0, 3 1 2: spacer 314, 318, 320 : Turning mirror

316 稜鏡 322 Internal polarized beam splitting surface (beamsplitter) 324 quarter _ — wave plate 326 lens spacer 328 objective 330 optical medium 332 light detector 408 ear piece 608 plate 801 bottom plate 802 working ring zone 804 tracking section 805 Bearing group 806 Tracking axis 808 Focusing section Page 30 1234146 Case No. 90123759 Modified drawing simple description 809: Hinge 8 1 0: Focusing axis 8 1 2: Base end 8 1 4: End end 1100, 1 400 : Method 1102, 1103, 1104, 1106, 1108, 1110, 1112, 1114, 1117, 1118, 1120, 1122, 1124, 1125, 1126, 1128: Action 1 2 0 6: Installation point 1 208: Starting point 1210: Force 1211 , 1215: Torque 1212, 1214: Force 1213, 1217: Torque 1216: Equal effect 1302, 1304: Points

Page 31

Claims (1)

1234146 Case No. 901237M 6. Application scope 1. An optical assembly, which includes: a base plate; an arm piece, which includes: a first section pivotally connected to the base plate with a first axis as a rotation center; And a second section, which is frame-connected to the first section with a second axis as the center of rotation; and q-foot fusing = v work failure zone 'the work ring belt extends to the first end of the second section When the second section is rotated around the second axis, at least a part of the work band is twisted. 2. The assembly of the scope of application for a patent, wherein the width of the working band is vertical when the first section is in a flat position. 3. The assembly according to item 1 of the scope of patent application, wherein the working belt further includes a second end mounted on the bottom plate. 4. The assembly of item i in the scope of patent application, wherein the first and second axes are orthogonal. The eighth application claims the assembly of item 1 of the patent scope, wherein at least W of the working belt is bent when the first section rotates about the first axis. The range of the patent of Ba Duan is like the assembly of item 1, wherein the first end extends from the second 71 by the point of the first and second axes. Axis and the patented harrow surrounds the assembly of item 6 wherein the point is closer to the second axis than to an optical head mounted on the arm member. 8. · An optical assembly comprising: Page 32 1234146 901237BQ Sixth, the scope of patent application / bottom plate; said correction / arm piece, which includes: Section & 'It is pivotally connected to the bottom plate with a first axis as the rotation center; spear section ##, its A second axis is pivotally connected to the second section; and / or a plurality of working ring belts, each working ring belt includes: a / th end, which extends from the second section, and ^ The second end is mounted on the bottom plate; and wherein: middle :: Γΐ :: to:-part of the -th section with the -axis as the middle m :; at least-part of the second section with the The second axis is 9. A method for predicting the work envelope by using a plurality of beam elements: (1) receiving one or more input parameters, including: the work loop is installed on one of a base plate— Point ,,); position of (,, the angle at which the first end is mounted on the bottom plate — the working band extends from the actuator arm — female &angle); ").的 位置 （、， 出 角 的 The second end is extended from the actuator arm — // Λ · ^ degree Leave; and the length of a beam element; Page 33 1234146 Case No. 90123759 Modified CC angle CC angle C away one C and 10 packs 11 11 12 13 14 Patent scope for each beam element: 2) Determine the starting position of one of the beam elements; 3) determine an angle (~ initial 〃) that the beam element is oriented at the beginning; 4) determine the position of one end of the beam element; and 5) determine an angle (a final 〃) that the beam element is oriented at; 6) If the final angle and end position of the last beam element are not approximately equal to the chamfer or installation angle and the starting point or installation point, change the value of one or more of these input parameters; and 7) Repeat actions (2) to (6) until The final corner end position of the last beam element is approximately equal to the departure or mounting angle and the starting point or mounting point. The method according to item 9 of the patent application range, wherein the input parameters further include: the total number of the beam elements; a magnitude of the X and Y components of the force acting on the beam elements; and one of the beam elements Bend modulus. The method according to item 10 of the patent application range, wherein the changed input parameters include the length of the beam element and the magnitude of the X and Y components. The method according to item 9 of the scope of patent application, wherein the determination start position package sets the start position of a first beam element to a position equal to the installation point. • The method according to item 12 of the scope of patent application, wherein the initial angle package is determined to set the initial angle of the first beam element equal to the installation angle. . The method of claim 9 in which the start position package is determined Page 34 1234146 Case No. 90123759_Year Month Amendment_ VI. Patent application scope includes setting the starting position of a current beam element equal to the end position of the previous beam element. 15. The method of claim 14 in the scope of patent application, wherein determining the initial angle includes setting the initial angle of the current beam element to be equal to the end angle of the previous beam element. 16. The method of claim 10, wherein determining the end angle includes: calculating a bending moment at one end of a current beam element; calculating an angular deflection amount at the end of the current beam element; and calculating the current beam element. The sum of the initial angle and the amount of angular deflection determines the ending angle. 17. The method according to item 16 of the scope of patent application, wherein the bending moment is calculated using the following equation: ^ = ^ 4-Lc〇s (^.) Ye = Ys ^ -Lcos (9s) Mh =-{Ye- Yp) Fx ^ (Xe-Xp) Fy where Xe and Ye are the end coordinates of the current beam element that is not deflected, Xp and Yp are the coordinates of the rotation axis, L is the beam length, and ^ is the current beam element The initial angle, Mb is the bending moment, and Fx * Fy are X and Υ components. 18. The method according to item 17 of the scope of patent application, wherein the amount of angular deflection is calculated using the following equation: Page 35 1234146 Case No. 90123759_Year Month Revision_ VI. Patent Application Range Where 50 is the amount of angular deflection and E I is the bending modulus. 19. The method of claim 18, wherein determining the final angle includes using the following equation: ef = θχ + δθ where < 9f is the final angle. 2 0. The method of item 9 in the scope of patent application, wherein determining the end position of a current beam element includes using the following equation: x, = xs ^ Lc〇s (es) Ye, = YS -fZcos (^) where The initial angle, and Xe. And Ye. Are the coordinates of the end position of the current beam element. 21. The method according to item 16 of the patent application range, wherein the input parameters further include an offset of the Y component from a rotation axis of the actuator arm. 22. The method according to item 21 of the patent application range, wherein the bending moment is calculated using the following equation: Xe = Xs + Lcos {0s) Ye = Ys + Lcos {0s) Mb =-(η-rv) FX + ( xe-X, + LofJsei) Fy where LQffset is the offset of the Y component 'Xe and Ye are the end coordinates of the current beam element that are not deflected, and Xs and Ys are the coordinates at the beginning of the current beam element' L Is the standard length 'Θ s is the initial angle of the current standard component' Mb is the 1234146 Case No. 90123759_Year Month Revision_ VI. Scope of patent application Bending moment, and Fx and Fy are the X and Y components. 23. The method of claim 22, wherein the angular deflection amount is calculated using the following equation: EI where 50 is the angular deflection amount and E I is the bending modulus. 24. The method of claim 23, wherein determining the final angle includes using the following equation: Θ f = 0S + δθ where is the final angle. 25. The method of claim 21, wherein the input parameters further include the offset of the Y component from the rotation axis and the magnitude of the X and Y components. 26. The method according to item 21 of the patent application scope further comprises calculating a torque on the actuator arm. 27. As in the method of claim 26, wherein the torque is calculated using the following equation: Mr = FyLoffset where Mj • is the torque, Fy is the magnitude of the Y component, and the Y component is away from the Offset of the rotation axis. 28. If the method according to item 9 of the patent application is applied, wherein the final angle and the end position of the last beam element are related to the installation angle or departure angle and the installation point Page 37 1234146 Case No. 90123759_Year Month Amendment_ VI. The scope of patent applications or the starting points are within a predetermined tolerance of each other, they are regarded as approximately equal. 2 9. An optical assembly comprising: a base plate; an arm member comprising: a first section pivotally connected to the base plate with a first axis as a rotation center; and a second section, It is pivotally connected to the first section with a second axis as the rotation center; at least one working ring, each working ring includes a first end protruding from the second section; and wherein: each working At least a part of the endless belt is bent when the first section rotates around the first axis. 3 0. An optical assembly comprising: a base plate; an arm member comprising: a first section pivotally connected to the base plate with a first axis as a rotation center; and a second section, It is framed to the first section with a second axis as the center of rotation; and at least one working ring, each working ring includes a first end protruding from the second section; and wherein: the work At least a portion of the endless belt is twisted when the second section rotates about the second axis. Page 38 1234146 Case No. 90123759 Amendment VI. Patent Application Scope 31. An optical assembly including: a base plate; an arm piece mounted on the base plate, the arm piece can have a first axis and a second The axis is pivoted at the center; and at least one working band extending from the arm member, wherein: at least a portion of the working band is bent when the arm member is rotated about the first axis; and the working band At least a part of the arm member is twisted when the arm member is rotated about the second axis. Page 39