CN116013374A - Compact CD-ROM with double optical heads without damage - Google Patents

Abstract

The invention provides a compact CD driver with double optical heads, which comprises a bottom shell component, a top cover component, a lower driver component, a pressure disc component and a pressure disc lifting component, wherein the bottom shell component is connected with the top cover component; the top cover assembly is arranged on the bottom cover assembly, and a read-write bin is formed between the bottom cover assembly and the top cover assembly; the bottom shell component comprises a bottom shell, a loading motor and a gear set, wherein the loading motor and the gear set are arranged on the bottom shell, the loading motor can drive the gear set, and the gear set drives the lower driver component to enter and exit the read-write bin; the pressure plate lifting assembly can drive the pressure plate assembly to lift. The compact CD-ROM with double optical heads has compact structure and high integration, and can meet the requirements of specific fields with limited standard or requirement on the size of the CD-ROM; the stability of the optical disk during reading and writing is ensured, and the optical disk is not contacted with other parts in the process of loading the optical disk, so that the signal surface of the optical disk is protected. The dual-driver component is adopted to work simultaneously, so that the dual-sided optical disk with large capacity can be correspondingly used, and the read-write speed is high.

Description

Compact CD-ROM with double optical heads without damage

Technical Field

The present invention relates to the field of optical storage technology, and in particular, to a compact optical disc drive with dual optical heads.

Background

With the advent of the big data age, the storage demands of small enterprises and individual users for data have been increasing in a burst, and optical disc storage products have been used in many fields. However, the internal transmission structure of the existing optical drive device is relatively complex, and the parts are more, so that the size of the optical drive is generally overlarge, and the optical drive device does not meet the field with specific requirements on the size of the optical drive; when the CD-ROM reads and writes the CD, the CD tilts and slips due to the high-speed rotation of the CD, the stability of the CD during reading is poor, and the reading and writing effects cannot be met; meanwhile, the existing CD driver can not deal with the double-sided CD with large capacity, and has low reading and writing efficiency.

Therefore, there is a need for an optical disc drive with a simple and compact transmission structure, which can meet the requirements of the specific field size standard, and which has a high read/write speed and high optical disc stability.

Disclosure of Invention

The present invention provides a compact optical disc drive with dual optical heads without damage to the optical disc, so as to solve the above-mentioned problems.

In order to achieve the above object, the technical scheme of the present invention is as follows:

a compact optical disk drive with double optical heads without damage comprises a bottom shell component, a top cover component, a lower driver component, a pressure disk lifting component and an upper driver component;

the top cover assembly is arranged on the bottom shell assembly, and a read-write bin is formed between the bottom shell assembly and the top cover assembly; the lower driver component and the pressure disc component are arranged in the read-write bin; the upper driver component is fixed on the top cover component and is arranged in the read-write bin;

the bottom shell assembly comprises a bottom shell, a loading motor and a gear set are arranged on the bottom shell, and the loading motor can drive the lower driver assembly to horizontally move through the gear set so as to enter and exit the read-write bin; the lower driver component is used for reading and writing the optical disc; the pressure plate lifting assembly is used for driving the pressure plate assembly to lift.

Further, the pressure plate lifting assembly comprises a driving pin and a guide rod;

the pressure plate assembly comprises a pressure plate support and pressure plates arranged on the pressure plate support, and support side plates extending downwards are arranged on the peripheries of two sides of the pressure plate support; the two outer sides of the support side plates are provided with vertical sliding grooves, and the two inner sides of the support side plates are provided with driving pins;

the lower driver component comprises a lower driver base, the cam sliding grooves are arranged on two sides of the lower driver base, and the height of one end, which is close to the lower driver component and is driven out of the read-write bin, of the cam sliding grooves is lower than that of the other end, so that when the lower driver component enters the read-write bin, the driving pins enter one end, which is lower than the cam sliding grooves, of the lower driver component, and the limit of the pressure disc device on the lower driver component on the optical disc is realized; the guide rod is fixed on the bottom shell; the pressure plate assembly is connected with the guide rod through the chute and can slide up and down along the guide rod; the driving pin is arranged in the cam sliding groove; when the lower driver base enters and exits the read-write bin, the driving pin can move in the cam sliding groove so as to drive the pressure plate assembly to move up and down along the guide rod.

Further, the upper driver component and the lower driver component have the same structure and comprise a feeding motor, a main shaft, a secondary shaft and an optical head, the feeding motor can drive the optical head to approach or depart from the feeding motor along the main shaft and the secondary shaft, and the upper driver component can realize reading and writing on the optical storage surface of the optical disk.

Further, a rack is fixed on the lower driver base, a gear cavity is formed in one side, close to the gear set, of the rack, and the gear set and the loading motor are arranged in the gear cavity; the gear set is meshed with the rack; the loading motor drives the lower driver base to enter and exit the read-write bin through the gear set and the rack.

Further, the lower driver base is further provided with a spindle motor, the spindle motor is provided with a chuck jaw, and the upper end of the chuck jaw can extend out of the middle opening of the optical disc and clamp the optical disc.

Further, a forced delivery hole is formed in the outer side of the lower driver base, the forced delivery hole is communicated with the gear cavity, the forced delivery hole corresponds to the gear set located in the gear cavity, the gear set driving piece can enter the gear cavity from the forced delivery hole and forcibly reversely rotate the gear set, and therefore the lower driver assembly is driven out of the read-write bin.

Further, a guide rail is arranged on the bottom shell;

the two sides of the lower driver base are provided with horizontal rib plates and longitudinal rib plates;

the top cover assembly comprises a top cover and top cover rib plates arranged on two sides of the interior of the top cover;

the upper end and the lower end of the horizontal rib plate are respectively abutted with the top cover rib plate and the guide rail, and one side, close to the horizontal rib plate, of the longitudinal rib plate is abutted with the guide rail;

through the horizontal rib plates and the longitudinal rib plates on two sides of the lower driver base, the lower driver base can move in and out of the read-write bin in the horizontal direction under the limiting and guiding actions of the guide rail and the top cover rib plates.

Further, a motor control switch is arranged on the bottom shell; when the lower driver component enters and exits the read-write bin, the motor control switch can be triggered or released by the lower driver base, so that the start and stop of the loading motor are realized.

Compared with the prior compact CD-ROM with double optical heads, the invention has the beneficial effects that:

(1) The compact CD-ROM with double optical heads has the advantages of simple internal transmission structure, less parts, compact structure, high integration level and space utilization rate, and can meet the requirements of specific fields with limit standards or requirements on the size of the CD-ROM;

(2) The stability of the CD in reading and writing can be ensured by the cooperation of the pressure disk assembly and the pressure disk lifting assembly arranged in the CD driver;

(3) The CD driver has upper and lower driver components, and is suitable for CD with high speed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a compact optical disc drive with dual optical heads without damage according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the matching relationship between a compact disc drive platen assembly with dual optical heads and a lower drive assembly and a bottom chassis assembly without damage to a disc in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a compact optical disc drive top cover assembly and an upper drive assembly with dual optical heads without damage according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a compact disc drive under-drive assembly with dual optical heads without loss for an optical disc according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a compact disc drive with dual optical heads according to an embodiment of the present invention;

FIG. 6 is a schematic diagram showing the matching relationship between a compact disc drive lower drive assembly with dual optical heads and a bottom housing assembly and a top cover assembly;

FIG. 7 is a schematic diagram of a compact optical disc drive with dual optical heads with no loss for forced unloading;

FIG. 8 is a schematic diagram showing the main components of a compact optical disc drive with dual optical heads according to an embodiment of the present invention when a compact optical disc drive is loaded in place;

FIG. 9 is a schematic diagram showing the main components of a compact disc drive with dual optical heads during unloading of a compact disc drive without damage.

In the figure: 1. a bottom shell assembly; 101. a bottom case; 102. loading a motor; 103. a gear set; 104. a guide rail; 105. a motor gear; 106. a reduction gear; 107. a loading gear; 108. a reduction gear upper wheel body; 109. a reduction gear lower wheel body; 110. loading the upper wheel body of the gear; 111. a loading gear lower wheel body; 112. a motor control switch; 113. a gear set driving member; 114. a main control circuit board; 2. a top cover assembly; 201. a top cover; 202. a top cover rib plate; 203. an indicator light; 204. discharging the bin key; 3. a lower driver assembly; 301. a lower driver base; 302. a rack; 303. a gear cavity; 304. a spindle motor; 305. chuck jaws; 306. forced discharging hole; 307. horizontal rib plates; 308. longitudinal rib plates; 309. a lower driver cover plate; 4. a platen assembly; 401. a platen support; 402. a platen; 403. a bracket side plate; 5. a platen lifter assembly; 501. a chute; 502. a drive pin; 503. a guide rod; 504. cam sliding grooves; 6. a read-write bin; 7. an optical disc; 8. an upper driver assembly; 801. a feed motor; 802. a main shaft; 803. a secondary shaft; 804. an optical head; 805. and a motor shaft.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Examples:

a compact optical disc drive with double optical heads without damage, as shown in fig. 1, comprises a compact optical disc drive with double optical heads without damage, and is characterized by comprising a bottom shell component 1, a top cover component 2, a lower driver component 3, a pressure disc device component 4, a pressure disc device lifting component 5 and an upper driver component 8;

the top cover assembly 2 is arranged on the bottom shell assembly 1, and a read-write bin 6 is formed between the bottom shell assembly 1 and the top cover assembly 2; the lower driver component 3 and the pressure disc device component 4 are arranged in the read-write bin 6; the upper driver component 8 is fixed on the top cover component 2 and is arranged in the read-write bin 6;

the bottom shell assembly 1 comprises a bottom shell 101, a loading motor 102 and a gear set 103 are arranged on the bottom shell 101, and the loading motor 102 can drive the lower driver assembly 3 to horizontally move through the gear set 103 so as to enter and exit the read-write bin 6; the lower driver assembly 3 is used for reading and writing an optical disc 7; the pressure plate lifting assembly 5 is used for driving the pressure plate assembly 4 to lift. A main control circuit board 114 is further arranged on the bottom shell 101 for controlling each component; the loading motor 102 drives the lower driver assembly 3 to enter and exit the read-write cabin 6 through the gear set 103, so that the optical disk is not contacted with other components in the process of loading the optical disk, friction of other components of the optical disk box is avoided, and the signal surface of the optical disk is protected. The compact CD-ROM with double optical heads has the advantages of simple internal transmission structure, less parts, compact structure, high integration level and space utilization rate, and can meet the requirements of specific fields with limit standards or requirements on the size of the CD-ROM; by adopting the mode of upper and lower double drivers, the two drivers work simultaneously, and can correspond to the double-sided optical disk with large capacity, and the read-write speed is high. The CD drive has the advantages that the stability of the CD during reading and writing can be ensured through the cooperation of the pressing disc assembly and the pressing disc lifting assembly in the CD drive.

Preferably, as shown in fig. 1 and 2, the platen lifter assembly 5 includes a driving pin 502 and a guide bar 503;

the pressure plate assembly 4 comprises a pressure plate support 401 and pressure plates 402 arranged on the pressure plate support 401, wherein support side plates 403 extending downwards are arranged on the periphery of two sides of the pressure plate support 401; two outer sides of the bracket side plate 403 are provided with vertical sliding grooves 501, and two inner sides of the bracket side plate 403 are provided with driving pins 502;

the lower driver assembly 3 includes a lower driver base 301, the cam sliding grooves 504 are disposed on two sides of the lower driver base 301, and the cam sliding grooves 504 are close to the height that one end of the lower driver assembly is lower than the other end of the lower driver assembly, which makes the driving pins 502 enter the lower end of the cam sliding grooves 504 when the lower driver assembly 3 enters the read-write bin 6, so as to limit the optical disc 7 located on the lower driver assembly 3 by the pressure disc 402; the guide bar 503 is fixed on the bottom case 101; the pressure plate assembly 4 is connected with the guide rod 503 through the chute 501 and can slide up and down along the guide rod 503; the drive pin 502 is disposed in the cam runner 504; when the lower driver base 301 moves in and out of the read-write cartridge 6, the driving pin 502 can move in the cam chute 504 to drive the platen assembly 4 to move up and down along the guide bar 503. The platen lifting assembly 5 drives the platen assembly 4 to be close to or far away from the lower driver assembly 3 in the vertical direction through the sliding groove 501, the driving pin 502, the guide rod 503 and the cam sliding groove 504, when the platen assembly 4 is positioned right above the lower driver assembly 3, the platen assembly 4 can stably keep the optical disk 7 on the lower driver assembly 3 on the spindle motor 304, and the optical disk 7 is not inclined and slipped due to high-speed rotation of the spindle motor 304, so that the stability of the optical disk 7 in the loading process is improved.

Preferably, as shown in fig. 3 and 4, the upper driver assembly 8 has the same structure as the lower driver assembly 3, and includes a feeding motor 801, a main shaft 802, a secondary shaft 803, and an optical head 804, where the feeding motor 801 can drive the optical head 804 to approach or separate from the feeding motor 801 along the main shaft 802 and the secondary shaft 803, and the upper driver assembly 8 can implement reading or writing on an optical storage surface of the optical disc 7. The top cover assembly 2 includes a top cover 201; the feeding motor 801, the main shaft 802 and the auxiliary shaft 803 are all fixed on the inner surface of the top cover 201, two ends of the optical head 804 are respectively and slidably connected to the auxiliary shaft 803 and the main shaft 802, one end of the feeding motor 801 is connected with a motor shaft 805, the motor shaft 805 is connected with one side, far away from the auxiliary shaft 803, of the optical head 804, the feeding motor 801 can drive the optical head 804 to slide along the auxiliary shaft 803 and the main shaft 802, and the optical head 804 can realize the function of reading the optical disk 7.

As shown in fig. 1 and 3, the top cover 201 is further provided with an indicator 203 and an out-of-bin key 204, and the out-of-bin key 204 is used for controlling the lower driver assembly 3 to enter and exit the read-write bin 6. The indicator light 203 is used for indicating the working states of the lower driver assembly 3 and the upper driver assembly 8;

preferably, as shown in fig. 4, a rack 302 is fixed on the lower driver base 301, a gear cavity 303 is disposed on a side of the rack 302, which is close to the gear set 103, and the gear set 103 and the loading motor 102 are disposed in the gear cavity 303; the gear set 103 is meshed with the rack 302; the loading motor 102 drives the lower driver base 301 into and out of the read-write cartridge 6 through the gear set 103 and the rack 302. A lower drive cover plate 309 is arranged on the lower drive base 301, the optical disc 7 is arranged on the lower drive cover plate 309, an opening is arranged on the lower drive cover plate 309, and the upper end of the spindle motor 304 and the upper end of the optical head 804 on the lower drive base 301 extend out of the opening, so as to read and write the optical disc 7;

the gear set 103 includes a motor gear 105, a reduction gear 106, and a loading gear 107; the reduction gear 106 comprises a reduction gear upper wheel body 108 and a reduction gear lower wheel body 109 fixed on the reduction gear upper wheel body 108; the loading gear 107 comprises a loading gear upper wheel body 110 and a loading gear lower wheel body 111 fixed on the loading gear upper wheel body 110;

as shown in fig. 2 and 5, the motor gear 105 is connected to the lower end of the loading motor 102, the motor gear 105 is meshed with the lower reduction gear body 109, the upper reduction gear body 108 is meshed with the lower loading gear body 111, and the upper loading gear body 110 is meshed with the rack 302; the loading motor 102 drives the rack 302 through the motor gear 105, the reduction gear lower wheel 109, the reduction gear upper wheel 108, the loading gear lower wheel 111 and the loading gear upper wheel 110, so as to drive the lower driver assembly 3 to enter and exit the read-write cabin 6.

Preferably, as shown in fig. 4, the lower drive base 301 is further provided with a spindle motor 304, the upper end of the spindle motor 304 is provided with a chuck claw 305, and the upper end of the chuck claw 305 can extend from the middle opening of the optical disc 7 and clamp the optical disc 7. The chuck claw 305 is used to fix the optical disc 7 on the spindle motor, especially when the optical disc drive is placed vertically, and can prevent the optical disc 7 from falling off the spindle motor 304.

Preferably, as shown in fig. 7, a forced discharging hole 306 is provided on the outer side of the lower driver base 301, the forced discharging hole 306 is in communication with the gear cavity 303, the forced discharging hole 306 corresponds to the gear set 103 located in the gear cavity 303, and the gear set driving member 113 can enter the gear cavity 303 from the forced discharging hole 306 and forcibly reversely rotate the gear set 103, so as to drive the lower driver assembly 3 out of the read-write cartridge 6. The gear set driving member 113 is a slender hard material, and can be inserted into the forced unloading hole 306, contact with the loading gear 107 and drive the gear set 103 to rotate reversely, so that the lower driver assembly 3 ejects a small part, and then pulls out the ejected part to the outside of the read-write bin 6 until the optical disc 7 is completely exposed, thereby solving the problem that the optical disc drive fails and cannot eject the optical disc.

Preferably, as shown in fig. 6, the bottom case 101 is provided with a guide rail 104;

the two sides of the lower driver base 301 are provided with horizontal rib plates 307 and longitudinal rib plates 308;

the top cover assembly 2 comprises a top cover 201 and top cover rib plates 202 arranged on two sides of the inside of the top cover 201;

the upper and lower ends of the horizontal rib 307 are respectively abutted against the top cover rib 202 and the guide rail 104, and the side of the longitudinal rib 308, which is close to the horizontal rib 307, is abutted against the guide rail 104;

the lower drive base 301 can move in a horizontal direction into and out of the read-write cartridge 6 under the restriction and guiding action of the guide rail 104 and the top cover rib 202 by the horizontal rib 307 and the longitudinal rib 308 on both sides of the lower drive base 301.

Preferably, as shown in fig. 4, the bottom case 101 is provided with a motor control switch 112; when the lower driver assembly 3 enters and exits the read-write cabin 6, the motor control switch 112 can be triggered or released by the lower driver base 301 to realize the start and stop of the loading motor 102.

The specific working process comprises the following steps: the initial state of the CD driver device is that the lower driver component is positioned at the corresponding CD read-write position in the read-write bin, the driving pin of the pressure disk device bracket is positioned in the lower chute of the cam chute of the lower driver base, namely the pressure disk device is positioned at the position close to the pressure disk device bracket, but the CD is not loaded at the moment; the motor control switch is in a state triggered by the lower driver base, and the loading motor does not work at the moment.

Pressing a bin inlet and outlet key on the top cover, starting a loading motor, driving a reduction gear by a motor gear arranged on the loading motor, driving a loading gear by the reduction gear, and driving a rack on a lower driver base by the loading gear, so that the lower driver component is driven to move (horizontally forwards) from a CD reading and writing position in a reading and writing bin to a CD pickup position outside the reading and writing bin, and simultaneously, releasing a motor control switch by the lower driver base; movement of the lower drive base causes the drive pins to slide into the upper portion of the lower drive base cam runner, the platen being pushed from a platen position proximate the lower drive base to a non-platen position (vertically upward) distal the lower drive base; when the lower driver component reaches the optical disk picking position outside the read-write bin, the lower driver base triggers the motor control switch again, and the loading motor stops working; at this time, the optical disk is placed on the spindle motor (lower drive cover plate) and is held by the chuck claws on the spindle motor; pressing the bin inlet and outlet keys on the top cover again, starting the loading motor to rotate reversely, driving the lower driver assembly to return to the optical disc reading and writing position (horizontally backward) in the reading and writing bin from the optical disc picking position outside the reading and writing bin by the aid of the gear set, and releasing the motor control switch by the lower driver base again; when the lower driver component is about to reach the CD read-write position in the read-write bin, the driving pin slides into the lower part of the cam chute of the lower driver base, the pressing disc is also pushed to the corresponding pressing disc position (vertically downwards), the lower driver component and the pressing disc component can reach the corresponding working positions at the same time, the pressing disc stably and reliably keeps the CD on the spindle motor, and meanwhile, the lower driver base triggers the motor control switch again, and the loading motor stops working. Thus, loading operation of the optical disc is completed, and the upper driver component is fixedly arranged at the corresponding optical disc reading and writing position on the top cover, so that any action is not needed in the whole process, and then the upper driver component and the lower driver component can start the optical disc reading and writing process. The states of the main components when the optical disc is loaded in place are shown in fig. 8.

After the reading and writing process of the optical disk is completed, pressing a bin inlet and outlet key on the top cover, repeating the flow of the first half section, and taking the optical disk off the spindle motor when the lower driver component carries the optical disk to the optical disk picking position outside the reading and writing bin; pressing the bin inlet and outlet key again, and repeating the flow in the second half section until the pressure plate assembly and the lower driver assembly return to the corresponding initial positions. So far, the unloading work of the optical disc is completed. The states of the main components at the time of unloading the optical disc are shown in fig. 9.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (8)

1. A compact optical disc drive with double optical heads, which is characterized by comprising a bottom shell component (1), a top cover component (2), a lower driver component (3), a pressure disc device component (4), a pressure disc device lifting component (5) and an upper driver component (8);

the top cover assembly (2) is arranged on the bottom shell assembly (1), and a read-write bin (6) is formed between the bottom shell assembly (1) and the top cover assembly (2); the lower driver component (3) and the pressure disc component (4) are arranged in the read-write bin (6); the upper driver component (8) is fixed on the top cover component (2) and is arranged in the read-write bin (6);

the bottom shell assembly (1) comprises a bottom shell (101), a loading motor (102) and a gear set (103) are arranged on the bottom shell (101), and the loading motor (102) can drive the lower driver assembly (3) to horizontally move through the gear set (103) so as to enter and exit the read-write bin (6); the lower driver component (3) is used for reading and writing an optical disc (7); the pressure plate lifting assembly (5) is used for driving the pressure plate assembly (4) to lift.

2. A compact disc drive with dual optical head with no loss of disc according to claim 1, characterized in that the platen lift assembly (5) comprises a drive pin (502) and a guide bar (503);

the pressure plate assembly (4) comprises a pressure plate support (401) and pressure plates (402) arranged on the pressure plate support (401), wherein support side plates (403) extending downwards are arranged on the peripheries of two sides of the pressure plate support (401); two outer sides of the support side plate (403) are provided with vertical sliding grooves (501), and two inner sides of the support side plate (403) are provided with driving pins (502);

the lower driver assembly (3) comprises a lower driver base (301), the cam sliding grooves (504) are arranged on two sides of the lower driver base (301), and the cam sliding grooves (504) are close to the lower driver assembly, one end of the lower driver assembly, which is driven out of the read-write bin (6), is lower than the other end of the lower driver assembly, so that when the lower driver assembly (3) enters the read-write bin (6), the driving pins (502) enter one end of the lower cam sliding grooves (504), which is lower, and limit of the pressure disc (402) on the optical disc (7) on the lower driver assembly (3) is realized; the guide rod (503) is fixed on the bottom shell (101); the pressure plate assembly (4) is connected with the guide rod (503) through the chute (501) and can slide up and down along the guide rod (503); the drive pin (502) is arranged in the cam runner (504); when the lower driver base (301) enters and exits the read-write bin (6), the driving pin (502) can move in the cam sliding groove (504) so as to drive the pressure plate assembly (4) to move up and down along the guide rod (503).

3. A compact disc drive with dual optical heads as claimed in claim 1, characterized in that the upper drive assembly (8) is structurally identical to the lower drive assembly (3) and comprises a feed motor (801), a main shaft (802), a secondary shaft (803) and an optical head (804), the feed motor (801) being capable of driving the optical head (804) along the main shaft (802) and the secondary shaft (803) close to or away from the feed motor (801), the upper drive assembly (8) being capable of enabling reading from and writing to a polished storage surface of the optical disc (7).

4. A compact disc drive with dual optical heads as claimed in claim 2, characterized in that a rack (302) is fixed on the lower drive base (301), a gear cavity (303) is arranged on one side of the rack (302) close to the gear set (103), and the gear set (103) and the loading motor (102) are arranged in the gear cavity (303); the gear set (103) is meshed with the rack (302); the loading motor (102) drives the lower driver base (301) to enter and exit the read-write bin (6) through the gear set (103) and the rack (302).

5. A compact disc drive with dual optical heads as claimed in claim 2, characterized in that the lower drive base (301) is further provided with a spindle motor (304), the spindle motor (304) is provided with a chuck claw (305), and the upper end of the chuck claw (305) can extend out from the middle opening of the optical disc (7) and clamp the optical disc (7).

6. A compact disc drive with dual optical heads as claimed in claim 4, characterized in that a forced unloading hole (306) is provided outside the lower drive base (301), the forced unloading hole (306) is communicated with the gear cavity (303), the forced unloading hole (306) corresponds to the gear set (103) located in the gear cavity (303), and a gear set driving member (113) can enter the gear cavity (303) from the forced unloading hole (306) and forcibly reversely rotate the gear set (103) so as to drive the lower drive assembly (3) out of the read-write compartment (6).

7. A compact disc drive with dual optical heads without loss of optical discs as claimed in claim 2, characterized in that the bottom casing (101) is further provided with a guide rail (104);

two sides of the lower driver base (301) are provided with horizontal rib plates (307) and longitudinal rib plates (308);

the top cover assembly (2) comprises a top cover (201) and top cover rib plates (202) arranged on two sides of the interior of the top cover (201);

the upper end and the lower end of the horizontal rib plate (307) are respectively abutted with the top cover rib plate (202) and the guide rail (104), and one side, close to the horizontal rib plate (307), of the longitudinal rib plate (308) is abutted with the guide rail (104);

through the horizontal rib plates (307) and the longitudinal rib plates (308) on two sides of the lower driver base (301), the lower driver base (301) can move into and out of the read-write bin (6) in the horizontal direction under the limiting and guiding actions of the guide rail (104) and the top cover rib plates (202).

8. A compact disc drive with dual optical heads without loss of optical discs as claimed in claim 2, said bottom housing (101) being provided with a motor control switch (112); when the lower driver assembly (3) enters and exits the read-write bin (6), the motor control switch (112) can be triggered or released by the lower driver base (301) to realize the start and stop of the loading motor (102).

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