A drive mechanism for an optical pickup assembly of an optical disc player

Abstract

The application discloses a drive mechanism of an optical disc machine and an optical pickup assembly thereof, which is connected between a screw rod of a stepping motor and the optical pickup assembly, and enables the optical pickup assembly to move back and forth along the axial direction of main guide rods and vice guide rods. The drive mechanism comprises a special-shaped bearing connecting piece and a spring. The bearing connecting piece is provided with oblique teeth which are engaged with the screw rod. The spring is arranged at the back of the oblique teeth, so that the oblique teeth are always engaged with the screw rod. The bearing connecting piece is more stable and reliable when being driven by the oblique teeth and the screw rod. In combination with the pre-pressing force of the elastic element, the reliable and stable tracking movement of the optical pickup assembly is effectively ensured. The structure is reasonable and simple, the installation and operation are convenient, and the maintenance cost after sale is remarkably reduced. The scheme is practical and effective, and especially applied to the core of the optical disc machine (commonly known as the optical drive) configured by the traditional desktop computer, so that good profit value can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical disc drive (or optical drive) and its core components configured by conventional desktop computer, in particular, it relates to a kind of optical disc drive (or optical drive) and the transmission mechanism of optical pickup head assembly thereof. BACKGROUND

[0002] The optical disc drive (commonly known as optical drive, same below) configured by conventional desktop computer adopts rack gear mechanism for the feeding action of optical pickup head assembly driven by stepping motor, and rack gear mechanism is also an important transmission mechanism connecting stepping motor and optical pickup head assembly.

[0003] The rack gear mechanism used in the optical disc drive in the prior art needs to convert the rotary motion of the screw rod connected to the stepping motor into the linear reciprocating motion of the optical pickup head assembly, and the optical pickup head assembly, the stepping motor and the spindle motor are all standard parts purchased in the field, the rack needs to be fixed on the optical pickup head assembly, the spindle motor is provided with a mounting plate (i.e. fixing plate), the stepping motor is provided with a screw rod, the transmission thread of the screw rod needs to be engaged with the rack, and the engagement between the rack and the screw rod also needs a certain pre-pressure to ensure the stability and reliability of the motion of the optical pickup head assembly driven by the stepping motor.

[0004] However, the installation space range of the rack left by the core components such as the optical pickup head assembly, the stepping motor, the spindle motor, the core base and the guide rod is limited, and the rack gear mechanism needs to be designed in the limited space, and the structure and size of the parts need to not only ensure the smooth motion of the optical pickup head assembly within the range of the standard stroke, but also ensure that the reading function of the optical pickup head assembly will not be greatly affected under the influence of certain environmental disturbances such as falling, impact and vibration.

[0005] However, the wall thickness of the outer thin-walled hole and the inner thin-walled hole of the conventional optical pickup head assembly is very thin and short, and the strength is weak, if the optical pickup head assembly cannot be effectively protected, the outer and / or inner thin-walled hole will be broken; at the same time, the lubricating oil on the screw rod of the stepping motor will also have the occasional risk of splashing on the surface of the optical pickup head.

[0006] Moreover, under the test environment of falling, impact and vibration specified in the standard, if the rack gear structure for protecting the optical pickup head assembly is not reasonably designed, the outer and / or inner thin-walled hole of the optical pickup head assembly will be seriously damaged, the motion of the optical pickup head assembly along the guide rod direction will be blocked, and it is difficult to ensure the reliable and smooth tracking motion of the optical pickup head assembly for a long time.

[0007] In addition, the existing rack and pinion mechanism used in the transmission mechanism of traditional optical disc drive stepper motors and optical read head components also has many defects such as complex structure, inconvenient installation, unstable connection, unreliable positioning, unreasonable limit contact design, and poor environmental adaptability, which greatly increases the after-sales maintenance cost.

[0008] Therefore, existing optical disc drives and their rack and pinion mechanisms still need improvement. Summary of the Invention

[0009] The purpose of this invention is to provide a transmission mechanism for an optical disc drive and its optical read head assembly, which can effectively ensure that the optical read head assembly performs reliable and stable track-seeking motion, and has a reasonable and simple structure, is easy to install and operate, and can significantly reduce after-sales maintenance costs.

[0010] The technical solution of the present invention is as follows: a transmission mechanism for an optical reading head assembly is connected between the screw of a stepper motor and the optical reading head assembly, so that the optical reading head assembly moves back and forth along the axial direction of a main guide rod and a secondary guide rod that are parallel to each other. The transmission mechanism includes an irregularly shaped load-bearing connector and a spring. The load-bearing connector is provided with helical teeth that mesh with the screw. The spring is provided on the back of the helical teeth so that the helical teeth always mesh with the screw.

[0011] The transmission mechanism of the optical reading head assembly includes: two parallel and perpendicular first side plates and second side plates extending integrally from the side of the bearing connector near the stepper motor screw; helical teeth are located on the outer side of the second side plate facing the stepper motor screw; and a spring is clamped between the first side plate and the second side plate and is in a compressed state.

[0012] The transmission mechanism of the optical reading head assembly includes: a second boss post is provided on the side of the second side plate facing the first side plate, and a first boss post coaxial with the second boss post is provided on the side of the first side plate facing the second side plate, with the two ends of the spring respectively fitted onto the first boss post and the second boss post.

[0013] The transmission mechanism of the optical reading head assembly, wherein a square through hole is provided in the middle of the connecting section between the root of the second side plate and the root of the first side plate.

[0014] The transmission mechanism of the optical reading head assembly, wherein: a tangible connecting rib is integrally provided between the first side plate and the second side plate of the bearing connector to replace the spring; the S-shaped connecting rib is preferably transversely connected between the top edge of the first side plate and the top edge of the second side plate.

[0015] The transmission mechanism of the optical pickup head assembly, wherein: the bottom surface of the bearing connecting piece is provided with a main positioning cylinder, a first auxiliary positioning cylinder, a second auxiliary positioning cylinder and a third auxiliary positioning cylinder at corresponding positions, which are respectively matched with the main positioning hole, the auxiliary positioning hole, the outer bottom surface groove and the inner bottom surface groove of the optical pickup head assembly; and all the positioning cylinders and the positioning holes or the bottom surface grooves matched therewith are in clearance fit.

[0016] The transmission mechanism of the optical pickup head assembly, wherein: the bottom surface of the bearing connecting piece is provided with a main positioning cylinder, a first auxiliary positioning cylinder, a second auxiliary positioning cylinder and a third auxiliary positioning cylinder at corresponding positions, which are respectively matched with the main positioning hole, the auxiliary positioning hole, the outer bottom surface groove and the inner bottom surface groove of the optical pickup head assembly; and all the positioning cylinders and the positioning holes or the bottom surface grooves matched therewith are in clearance fit.

[0017] The transmission mechanism of the optical pickup head assembly, wherein: the bottom surface of the bearing connecting piece is provided with a main positioning cylinder, a first auxiliary positioning cylinder, a second auxiliary positioning cylinder and a third auxiliary positioning cylinder at corresponding positions, which are respectively matched with the main positioning hole, the auxiliary positioning hole, the outer bottom surface groove and the inner bottom surface groove of the optical pickup head assembly; and all the positioning cylinders and the positioning holes or the bottom surface grooves matched therewith are in clearance fit.

[0018] The transmission mechanism of the optical pickup head assembly, wherein: the bottom surface of the bearing connecting piece is provided with a main positioning cylinder, a first auxiliary positioning cylinder, a second auxiliary positioning cylinder and a third auxiliary positioning cylinder at corresponding positions, which are respectively matched with the main positioning hole, the auxiliary positioning hole, the outer bottom surface groove and the inner bottom surface groove of the optical pickup head assembly; and all the positioning cylinders and the positioning holes or the bottom surface grooves matched therewith are in clearance fit.

[0019] An optical disc player, comprising a core component, a spindle motor, a stepping motor and an optical pickup head assembly, wherein: the transmission mechanism of the optical pickup head assembly according to any one of the above is arranged in the core component.

[0020] Compared with the rack transmission mechanism of the optical disc player and the optical pickup head assembly in the prior art, the bearing connecting piece used in the transmission mechanism of the optical disc player and the optical pickup head assembly has the characteristics of more stable and reliable transmission when the helical gear is used to drive the screw, and the pre-pressing force of the elastic element is combined to effectively ensure the reliable and stable tracking movement of the optical pickup head assembly, the structure is reasonable and simple, the installation and operation are convenient, and the maintenance cost after sale is significantly reduced; and the scheme is practical and effective, and can achieve good profit value when applied in the core of the optical disc player (commonly known as the optical drive) configured by the traditional desktop computer. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings described herein are for purposes of illustration only and are not intended to limit the scope of the present disclosure in any way; rather, the present disclosure is to cover all logically possible variations of the illustrated configurations; the configurations shown in the drawings and their attendant descriptions are exemplary and explanatory only; various changes to the size, shape, and proportions of the kinds of components shown in the drawings and their attendant descriptions can be made without departing from the spirit of the present disclosure and its scope.

[0022] Figure 1 is a perspective view of the internal structure of the optical disc player of the present application (in a reduced scale) ;

[0023] Figure 2 is a perspective view of the connection structure of the optical pickup assembly and the main guide rod in the prior art;

[0024] Figure 3 is a perspective view of the bottom side of the optical pickup assembly in the prior art;

[0025] Figure 4 is a perspective view of the bottom side of the bearing connecting member for the transmission mechanism of the optical pickup assembly of the present application;

[0026] Figure 5 is a perspective view of the connection structure of the bearing connecting member for the transmission mechanism of the optical pickup assembly and the screw rod of the optical pickup assembly and the stepping motor of the present application;

[0027] Figure 6 is a perspective view of the top side of the bearing connecting member for the transmission mechanism of the optical pickup assembly of the present application;

[0028] Figure 7 is a perspective view of the baffle side of the bearing connecting member for the transmission mechanism of the optical pickup assembly of the present application;

[0029] Figure 8 is a perspective view of the helical tooth side of the bearing connecting member for the transmission mechanism of the optical pickup assembly of the present application;

[0030] The numbers in the figures are as follows: optical pickup head assembly 1, outer thin-walled hole 11, inner thin-walled hole 12, bottom recess 13, outer bottom recess 131, inner bottom recess 132, positioning hole 14, secondary positioning hole 141, primary positioning hole 142, stepping motor 2, screw 21 (of the stepping motor 2), bearing connecting piece 3, square through hole 3a, protruding block 31, U-shaped port buffer groove 32, first secondary positioning cylinder 341, primary positioning cylinder 342, second secondary positioning cylinder 343, third secondary positioning cylinder 344, inner baffle 35, T-shaped combined protective plate 36, upright protective plate 361, L-shaped protective plate 362, first side plate 37, first boss column 371, reinforcing ribs (372 and 373) (of the first side plate 37), second side plate 38, second boss column 381, bevel gear 382, flat plate 39, core base 4, outer limiting stopper 41, spring 5, primary guide rod 6, spindle motor 7, inner limiting baffle 71, secondary guide rod 8. DETAILED DESCRIPTION

[0031] The specific embodiments and examples of the present application will be described in detail below with reference to the accompanying drawings, which are described only to explain the present application, and are not intended to limit the specific embodiments of the present application.

[0032] As shown in Figure 1 The transmission mechanism of the optical pickup head assembly used in the optical disc player of the present application is arranged in the core of the optical drive (also referred to as the optical disc player) used in a conventional desktop computer, and is connected between the screw 21 of the stepping motor 2 and the optical pickup head assembly 1, for moving the optical pickup head assembly 1 back and forth along the axial direction of the primary guide rod 6 and the secondary guide rod 8, i.e., for making the optical pickup head assembly 1 perform reciprocating tracking movement along the radial direction of the spindle motor 7. The improvement of the transmission mechanism of the optical pickup head assembly used in the optical disc player of the present application is that a special-shaped bearing connecting piece 3 is transmissionally connected between the primary guide rod 6, the screw 21 of the stepping motor 2 and the optical pickup head assembly 1. The bearing connecting piece 3 is provided with a bevel gear which is engaged with the screw 21. The back of the bevel gear is provided with a spring 5. The spring force of the spring 5 is used to make the bevel gear always engaged with the screw 21, for ensuring reliable and smooth tracking movement of the optical pickup head assembly 1.

[0033] In combination with Figure 2 and Figure 3As shown, the optical reading head assembly 1 in the prior art is a standardized component in this field. The two end faces of the connection point between the optical reading head assembly 1 and the main guide rod 6 are respectively provided with a coaxial outer thin-walled hole 11 (i.e., the side closer to the main spindle motor 7 after installation) and an inner thin-walled hole 12 (i.e., the side closer to the stepper motor 2 after installation). These are used to mount one end of the optical reading head assembly 1 onto the main guide rod 6 and allow it to slide, while the other end of the optical reading head assembly 1 is secured to the auxiliary guide rod 8 and also allows it to slide. The optical reading head assembly 1 connected to the main guide rod 6... The bottom surface of the connection is provided with an outer bottom surface groove 131 and an inner bottom surface groove 132 to form a bottom surface groove 13. Both the outer bottom surface groove 131 and the inner bottom surface groove 132 are oblong countersunk holes, and the length direction of the countersunk holes is set along the length direction of the optical reading head assembly 1. On the side of the optical reading head assembly 1 near the main guide rod 6, a secondary positioning hole 141 and a main positioning hole 142 are respectively provided to form a positioning hole 14. Both the secondary positioning hole 141 and the main positioning hole 142 are round holes, and the diameter of the main positioning hole 142 is larger than the diameter of the secondary positioning hole 141.

[0034] However, as mentioned earlier, the outer thin-walled hole 11 and the inner thin-walled hole 12 of the optical read head assembly 1 used in traditional optical disc drives have very thin and short walls, and their strength is also weak. Furthermore, the design of the rack and pinion transmission mechanism used in the stepper motor and optical read head assembly of traditional optical disc drives is unreasonable, resulting in many defects such as complex structure, inconvenient installation, unstable connection, unreliable positioning, unreasonable limit contact design, and poor environmental adaptability. This causes severe damage to the thin-walled holes (11 and 12) on the outer and inner sides of the optical read head assembly 1, which leads to obstruction of the movement of the optical read head assembly along the guide rod direction, making it difficult to effectively ensure the long-term reliable and stable track-seeking movement of the optical read head assembly 1.

[0035] Therefore, in combination Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, specifically, the bearing connector 3 used in the transmission mechanism of the optical reading head assembly of the present invention has an overall T-shaped layout. Two parallel and perpendicular first side plates 37 and second side plates 38 extend integrally from the side of the bearing connector 3 near the screw 21 of the stepper motor 2. The helical teeth 382 are located on the outer side surface of the second side plate 38 facing the screw 21 of the stepper motor 2. The spring 5 is sandwiched between the first side plate 37 and the second side plate 38 and is in a compressed state so that the helical teeth 382 can reliably mesh with the screw 21. Preferably, a pair of helical teeth 382 are provided on the outer side surface of the second side plate 38 facing the screw 21 of the stepper motor 2 for meshing with the screw 21 of the stepper motor 2.

[0036] Specifically, the second side plate 38 is provided with a second boss column 381 on the side surface facing the first side plate 37, the first side plate 37 is provided with a first boss column 371 coaxial with the second boss column 381 on the side surface facing the second side plate 38, both ends of the spring 5 are sleeved on the first boss column 371 and the second boss column 381 respectively, so as to prevent the spring 5 from being detached from between the first side plate 37 and the second side plate 38 during the tracking movement of the optical pickup head assembly 1, and the outer diameter of the first boss column 371 and the second boss column 381 and the inner diameter of both ends of the spring 5 preferably adopt a transition fit mode; preferably, the cross sections of the first boss column 371 and the second boss column 381 are both oval-shaped, so as to facilitate disassembly and assembly.

[0037] In order to enable the bevel gear 382 to stably mesh with the screw rod 21, preferably, a square-shaped through hole 3a is arranged in the middle of the connecting section between the root of the second side plate 38 and the root of the first side plate 37, so as to reduce the rigidity of the connecting section between the second side plate 38 and the first side plate 37 and improve the elasticity of the second side plate 38; at the same time, reinforcing ribs (372 and 373) are arranged on both sides of the connecting section between the first side plate 37 and the bottom surface and the top surface of the bearing connecting piece 3, so as to improve the rigidity of the first side plate 37.

[0038] In order to enable the bearing connecting piece 3 to be stably connected with the optical pickup head assembly 1 and firmly positioned, and to make the limit contact design more reasonable, in addition to the main positioning cylinder 342 and the first auxiliary positioning cylinder 341 being arranged at the corresponding positions on the bottom surface of the bearing connecting piece 3 and being adapted to the main positioning hole 142 and the auxiliary positioning hole 141 of the optical pickup head assembly 1 respectively, the second auxiliary positioning cylinder 343 and the third auxiliary positioning cylinder 344 also need to be arranged at the corresponding positions on the bottom surface of the bearing connecting piece 3 and be adapted to the outer bottom surface groove 131 and the inner bottom surface groove 132 of the optical pickup head assembly 1 respectively, and all the positioning cylinders (the main positioning cylinder 342, the first auxiliary positioning cylinder 341, the second auxiliary positioning cylinder 343 or the third auxiliary positioning cylinder 344) and the positioning holes (the main positioning hole 142 or the auxiliary positioning hole 141) or the bottom surface grooves (the outer bottom surface groove 131 or the inner bottom surface groove 132) adapted thereto adopt a clearance fit mode.

[0039] Further, in order to avoid the thin-walled holes (11 and 12) on the outer side and inner side of the optical pickup head assembly 1 from being damaged seriously under the (standard prescribed) drop, impact and vibration (test) environment, on one hand, a T-shaped combined protective plate 36 is vertically connected to the side edge of the bottom surface of the bearing connecting piece 3 near the second secondary positioning cylinder 343, the T-shaped combined protective plate 36 is composed of an upright protective plate 361 and an L-shaped protective plate 362, and is used for cooperating with the second secondary positioning cylinder 343 to avoid the outer thin-walled hole 11 of the optical pickup head assembly 1 from being damaged seriously; on the other hand, a trapezoidal double-beam plate 33 is vertically connected to the bottom edge of the bottom surface of the bearing connecting piece 3 near the third secondary positioning cylinder 344, and is used for cooperating with the reinforcing beam 372 of the first side plate 37 to avoid the inner thin-walled hole 12 of the optical pickup head assembly 1 from being damaged seriously, and the distance between the trapezoidal double-beam plates 33 can accommodate the main guide rod 6 to pass through smoothly.

[0040] Specifically, in order to limit the optical pickup head assembly 1 to perform the tracking movement within the prescribed stroke range, on one hand, Figure 1 the end of the main guide rod 6 near the step motor 2 side is connected to the machine core base 4 via a fixing sheet, the fixing sheet is used as an outer limiting stop block 41, a protruding block 31 is correspondingly arranged at the large end of the trapezoidal double-beam plate 33, and is used for limiting the outer stroke limit position of the optical pickup head assembly 1; on the other hand, Figure 1 an inner limiting stop plate 71 is made by downwardly bending and extending on the fixing plate (i.e. the mounting bottom plate) for mounting the spindle motor 7, and an inner stop plate 35 is correspondingly arranged at the bottom edge of the bearing connecting piece 3 near the second secondary positioning cylinder 343, and is used for limiting the inner stroke limit position of the optical pickup head assembly 1.

[0041] Further, in order to reduce the impact force on the optical pickup head assembly 1 under the (standard prescribed) drop, impact and vibration (test) environment, a U-shaped opening buffer groove 32 with a certain width and depth is arranged on the inclined edge of the trapezoidal double-beam plate 33 near the large end in the direction perpendicular to the bottom surface of the bearing connecting piece 3, and the U-shaped opening buffer groove 32 is located between the protruding block 31 and the trapezoidal double-beam plate 33, and can absorb a certain impact energy in the process that the protruding block 31 collides with the outer limiting stop block 41.

[0042] Further, in order to prevent the lubricating oil on the screw rod 21 of the step motor 2 from splashing to the pickup head surface of the optical pickup head assembly 1 when the screw rod 21 rotates, the top edge of the second side plate 38 with the oblique tooth 382 integrally extends a flat plate 39 which is perpendicular to the second side plate 38 and has a certain width, the flat plate 39 is located above the main guide rod 6 after installation, and plays a dustproof role on the meshing position of the oblique tooth 382 and the screw rod 21; preferably, the width of the flat plate 39 is equal to (i.e. the embodiment shown in the figure) or greater than the width of the second side plate 38.

[0043] Based on the transmission mechanism of the aforementioned optical read head assembly, this invention also proposes an optical disc drive or optical disk drive, such as... Figure 1 As shown, the device includes a mechanism component, a spindle motor 7, a stepper motor 2, and an optical read head assembly 1. The spindle motor 7 is vertically mounted on the mechanism base 4 of the mechanism component, and the stepper motor 2 is horizontally mounted on the mechanism base 4 of the mechanism component. The screw 21 of the stepper motor 2 is perpendicular to but does not intersect with the axis of the spindle motor 7. Parallel main guide rods 6 and secondary guide rods 8 are also provided on the mechanism base 4 on both sides of the spindle motor 7. Both the main guide rod 6 and the secondary guide rod 8 are perpendicular to but do not intersect with the axis of the spindle motor 7. The mechanism component includes a transmission mechanism for the optical read head assembly as described in any of the above embodiments.

[0044] Regarding the material selection during implementation, specifically, the load-bearing connector 3 is preferably made of POM (polyformaldehyde, also known as "super steel" or "acetal steel"), which can greatly improve the mechanical strength of the load-bearing connector 3, with high impact strength and excellent elasticity; while the spring 5 is preferably made of stainless steel, which not only has sufficient elasticity, but also avoids rusting and has a dynamic pressure balancing function; thus, the reliability and stability of the transmission mechanism can be greatly improved.

[0045] In addition, in some applications with less demanding requirements, an S-shaped connecting rib can be integrally provided between the first side plate 37 and the second side plate 38 of the bearing connector 3 to replace the spring 5, which can achieve a similar effect and reduce material costs. For easy demolding, the S-shaped connecting rib (not shown in the figure) is preferably transversely connected between the top edge of the first side plate 37 and the top edge of the second side plate 38.

[0046] It should be noted that the load-bearing connector 3 used in the transmission mechanism of the optical disc drive and its optical reading head assembly of the present invention does not achieve a simple function with a complex structure, nor does it use conventional or simple features for combination or stacking. This conforms to the common sense of technical improvement and is practical.

[0047] All items not described in detail in this specification are existing technologies known to those skilled in the art, such as spindle motors, stepper motors, and optical readout head assemblies.

[0048] It should be understood that the above description is only a preferred embodiment of the present invention and is not sufficient to limit the technical solution of the present invention. For those skilled in the art, within the spirit and principles of the present invention, additions, subtractions, substitutions, transformations or improvements can be made based on the above description, and all such additions, subtractions, substitutions or improvements should fall within the protection scope of the appended claims of the present invention.

Claims

1. A drive mechanism for an optical pickup head assembly, characterized by: The transmission mechanism is connected between the screw (21) of the stepper motor (2) and the optical reading head assembly (1), so that the optical reading head assembly (1) moves back and forth along the axial direction of the parallel main guide rod (6) and the secondary guide rod (8). The transmission mechanism includes an irregularly shaped load-bearing connector (3) and a spring (5). The load-bearing connector (3) is provided with helical teeth that mesh with the screw (21), and the spring (5) is provided on the back of the helical teeth so that the helical teeth always mesh with the screw (21). Two parallel and perpendicular side plates (37 and 38) extend integrally from the side of the bearing connector (3) near the screw (21) of the stepper motor (2). Helical teeth (382) are located on the outer surface of the second side plate (38) facing the screw (21) of the stepper motor (2). A spring (5) is sandwiched between the first side plate (37) and the second side plate (38) and is in a compressed state. A square through hole (3a) is provided in the middle of the connecting section between the root of the second side plate (38) and the root of the first side plate (37) to lower the second side plate (38). The rigidity of the connecting section between the first side plate (37) and the second side plate (38) is improved, and the elasticity of the second side plate (38) is enhanced. The bearing connector (3) is provided with a main positioning cylinder (342), a first auxiliary positioning cylinder (341), a second auxiliary positioning cylinder (343) and a third auxiliary positioning cylinder (344) at the corresponding positions on the bottom surface of the bearing connector (3), which are respectively adapted to the main positioning hole (142), auxiliary positioning hole (141), outer bottom surface groove (131) and inner bottom surface groove (132) of the optical reading head assembly (1). All positioning cylinders are fitted with their corresponding positioning holes or bottom surface grooves using a clearance fit method. The bottom surface of the bearing connector (3) is vertically connected to the side of the second auxiliary positioning cylinder (343) with a T-shaped combined protective plate (36) composed of an upright protective plate (361) and an L-shaped protective plate (362), which is used to cooperate with the second auxiliary positioning cylinder (343) to prevent the outer thin-walled hole (11) of the optical reading head assembly (1) from being severely damaged; and the bottom surface of the bearing connector (3) is vertically connected to the bottom edge of the third auxiliary positioning cylinder (344) with a trapezoidal double stiffener plate (33).

2. The drive mechanism of an optical read head assembly according to claim 1, wherein: The second side plate (38) has a second boss (381) on the side facing the first side plate (37), and the first side plate (37) has a first boss (371) coaxial with the second boss (381) on the side facing the second side plate (38). The two ends of the spring (5) are respectively fitted onto the first boss (371) and the second boss (381).

3. The drive mechanism of an optical read head assembly according to claim 1, wherein: The structure of the bearing connector (3) having an S-shaped connecting rib integrally provided between the first side plate (37) and the second side plate (38) to replace the spring (5); the S-shaped connecting rib is preferably horizontally connected between the top edge of the first side plate (37) and the top edge of the second side plate (38).

4. The drive mechanism of an optical pickup head assembly according to claim 1, wherein: A convex block (31) is arranged at the large end of the trapezoidal double-rib plate (33), and a fixing sheet for fixing one end of the main guide rod (6) is arranged as an outer limit stopper (41) for limiting the outer travel limit position of the optical reading head assembly (1); an inner stopper (35) is arranged on the bottom edge of the bearing connecting member (3) near the second sub-positioning cylinder (343), and an inner limit stopper (71) is made by bending downward and extending on the fixing plate for mounting the main shaft motor (7), for limiting the inner travel limit position of the optical reading head assembly (1).

5. The drive mechanism of the optical pickup head assembly of claim 1, wherein: A U-shaped port buffer groove (32) is arranged on the inclined edge near the large end of the trapezoidal double-rib plate (33) in the direction perpendicular to the bottom surface of the bearing connecting member (3), and the U-shaped port buffer groove (32) is located between the convex block (31) and the trapezoidal double-rib plate (33).

6. An optical disc player comprising a chassis part, a spindle motor (7), a stepping motor (2) and an optical pickup assembly (1), characterized in that: The transmission mechanism of the optical reading head assembly of any one of claims 1 to 5 is arranged in the machine core component.

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