Blue light optical head with ultrahigh-speed recording and reproducing capability

Abstract

The invention discloses a blue light optical head with ultra-high-speed recording and reproducing capability, which comprises a first information recording and reproducing unit, a second information recording and reproducing unit and a blue light source, wherein the first information recording and reproducing unit is used for irradiating emergent light from the blue light source on an optical information recording medium and reflecting the emergent light from the light source to a second information recording and reproducing unit; a second information recording / reproducing unit for irradiating the reflected light from the first information recording / reproducing unit on an optical information recording medium while transmitting the reflected light from the first information recording / reproducing unit to a third information recording / reproducing unit; the third information recording / reproducing unit is configured to irradiate the transmitted light from the second information recording / reproducing unit on the optical information recording medium. The blue light optical head designed by the invention has the characteristics of a single light source and three objective lenses, has ultra-high-speed recording and regenerating capacity, solves the problem of low recording and regenerating speed of a traditional optical head with a single light source and a single objective lens, is smaller in size and lower in production cost, and has great application potential and wide market prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of optical storage systems, and in particular to a blue-ray optical head with ultra-high-speed recording and reproducing capabilities. Background Art

[0002] In optical storage systems, the optical head is the core key component for recording and reproducing in optical storage systems. Usually, a standard optical head is equipped with a single light source and a single objective lens, and performs recording and reproducing work through an optical path. Its recording and reproducing speed is slow, and can only reach 60M / S. In the future, optical discs will develop in the direction of multi-layer and ultra-multi-layer. In order to improve the recording and reproducing speed of optical disc data, it is theoretically necessary to adopt a multi-optical head system, that is, to install multiple optical heads in one movement to meet the use requirements. However, the multi-optical head design will not only greatly increase the production cost, but also cause great challenges to the internal layout of the movement due to the increase in the size of the optical head, which increases the complexity of the design. Summary of the invention

[0003] The present invention provides a blue-ray optical head with ultra-high-speed recording and reproducing capability, so as to overcome the technical problem that a standard optical head is usually equipped with a single light source and a single objective lens, performs recording and reproducing work through one optical path, and its recording and reproducing speed is insufficient to meet actual needs.

[0004] In order to achieve the above object, the technical solution of the present invention is:

[0005] A blue-ray optical head with ultra-high-speed recording and reproducing capability comprises a first information recording and reproducing unit, a second information recording and reproducing unit and a third information recording and reproducing unit; the first information recording and reproducing unit is used for irradiating the outgoing light from a blue-ray light source onto an optical information recording medium, and at the same time reflecting the outgoing light from the light source to the second information recording and reproducing unit; the second information recording and reproducing unit is used for irradiating the reflected light from the first information recording and reproducing unit onto the optical information recording medium, and at the same time transmitting the reflected light from the first information recording and reproducing unit to the third information recording and reproducing unit; the third information recording and reproducing unit is used for irradiating the transmitted light from the second information recording and reproducing unit onto the optical information recording medium.

[0006] Furthermore, the first information recording and reproducing unit includes a first biasing element, a first collimating lens, a second biasing element and a first objective lens assembly; the first biasing element is used to transmit the outgoing light from the blue light source to the first collimating lens and reflect it to the second information recording and reproducing unit, the first collimating lens is used to transmit the transmitted light from the first biasing element to the second biasing element, and the second biasing element is used to reflect the transmitted light from the first collimating lens to the first objective lens assembly; the second information recording and reproducing unit includes a third biasing element, a second collimating lens, a fourth biasing element and a second objective lens assembly; the third biasing element is used to reflect the reflected light from the first biasing element to the second collimating lens and the second objective lens assembly, respectively. The second collimating lens and the light transmitted to the third information recording and reproducing unit, the second collimating lens is used to transmit the reflected light from the third biasing element to the fourth biasing element, and the fourth biasing element is used to reflect the transmitted light from the second collimating lens to the second objective lens assembly; the third information recording and reproducing unit includes a fifth biasing element, a third collimating lens, a sixth biasing element and a third objective lens assembly; the fifth biasing element is used to reflect the transmitted light from the third biasing element to the third collimating lens, the third collimating lens is used to transmit the reflected light from the fifth biasing element to the sixth biasing element, and the sixth biasing element is used to reflect the transmitted light from the third collimating lens to the third objective lens assembly.

[0007] Furthermore, a Blu-ray optical head with ultra-high-speed recording and reproducing capability also includes a first light quantity detection component, a second light quantity detection component and a third light quantity detection component; the second biasing element is used to transmit the transmitted light from the first collimating lens to the first light quantity detection component, and the first light quantity detection component monitors the light output of the first information recording and reproducing unit according to the incident light; the fourth biasing element is used to transmit the transmitted light from the second collimating lens to the second light quantity detection component, and the second light quantity detection component monitors the light output of the second information recording and reproducing unit according to the incident light; the sixth biasing element is used to transmit the transmitted light from the third collimating lens to the third light quantity detection component, and the third light quantity detection component monitors the light output of the third information recording and reproducing unit according to the incident light.

[0008] Furthermore, a Blu-ray optical head with ultra-high-speed recording and reproducing capability also includes a first signal detection component, a second signal detection component and a third signal detection component; the first signal detection component is used to detect the reflected light reflected by the optical information recording medium and incident through the first information recording and reproducing unit; the second signal detection component is used to detect the reflected light reflected by the optical information recording medium and incident through the second information recording and reproducing unit; the third signal detection component is used to detect the reflected light reflected by the optical information recording medium and incident through the third information recording and reproducing unit.

[0009] Further, the first signal detection component includes a seventh biasing element, a first detection mirror component and a first photodetector; the seventh biasing element is used to reflect the reflected light reflected by the optical information recording medium and incident via the first information recording and reproducing unit to the first detection mirror component, the first detection mirror component is used to focus the incident light to the first photodetector, and the first photodetector is used to perform light detection; the second signal detection component includes a second detection mirror component and a second photodetector; the second detection mirror component is used to focus the reflected light reflected by the optical information recording medium and incident via the second information recording and reproducing unit to the second photodetector, and the second photodetector is used to perform light detection; the third signal detection component includes a third detection mirror component and a third photodetector; the third detection mirror component is used to focus the reflected light reflected by the optical information recording medium and incident via the third information recording and reproducing unit to the third photodetector, and the third photodetector is used to perform light detection;

[0010] Furthermore, the first objective lens assembly, the second objective lens assembly and the third objective lens assembly all include A wave plate, an objective lens and servo control elements arranged relatively on both sides of the objective lens; The wave plate is used to convert the incident light into circularly polarized light; the objective lens is used to focus the incident circularly polarized light onto the optical information recording medium; and the servo control element is used to control focusing and tracking servo.

[0011] Beneficial effects: The blue-ray optical head designed by the present invention is characterized by its single light source and three-objective lens design, and has ultra-high-speed recording and reproducing capabilities, which solves the problem of slow recording and reproducing speed of traditional single-light source and single-objective lens optical heads. By introducing multiple bias elements and innovative optical path design, the single blue-ray light source is split into three beams of light. These three beams of light work independently in the same optical head, realizing the simultaneous recording and reproducing of adjacent multi-track signals, which not only greatly improves the recording and reproducing speed, but also effectively reduces the bit error rate. Compared with the traditional multi-optical head system design, this optical head design is smaller in size, lower in production cost, occupies less space, has a lower bit error rate, and a faster recording and reproducing speed. The above characteristics make it have great application potential and broad market prospects in related fields such as optical storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0013] Figure 1 and Figure 2 The schematic diagram of the structure of a blue-ray optical head with ultra-high-speed recording and reproducing capability according to the present invention.

[0014] In the figure: 1, first information recording and reproducing unit; 11, first biasing element; 12, first collimating lens; 13, second biasing element; 14, first objective lens assembly;

[0015] 2. a second information recording and reproducing unit; 21. a third biasing element; 22. a second collimating lens; 23. a fourth biasing element; 24. a second objective lens assembly;

[0016] 3. a third information recording and reproducing unit; 31. a fifth biasing element; 32. a third collimating lens; 33. a sixth biasing element; 34. a third objective lens assembly;

[0017] 4. A first light quantity detection component; 5. A second light quantity detection component; 6. A third light quantity detection component;

[0018] 7. First signal detection component; 71. Seventh biasing element; 72. First detection mirror component; 73. First photodetector;

[0019] 8. Second signal detection component; 81. Second detection mirror component; 82. Second photoelectric detector;

[0020] 9. A third signal detection component; 91. A third detection mirror component; 92. A third photoelectric detector;

[0021] A. Blue light source; B. Wave plate; 141, Wave plate; 241, objective lens; 341, servo control element. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] This embodiment provides a blue-ray optical head with ultra-high-speed recording and reproducing capabilities. Figure 1 and Figure 2As shown, a first information recording and reproducing unit 1, a second information recording and reproducing unit 2 and a third information recording and reproducing unit 3; the first information recording and reproducing unit 1 is used for irradiating the outgoing light from the blue light source onto the optical information recording medium, and at the same time reflecting the outgoing light from the blue light source A to the second information recording and reproducing unit 2; the second information recording and reproducing unit 2 is used for irradiating the reflected light from the first information recording and reproducing unit 1 onto the optical information recording medium, and at the same time transmitting the reflected light from the first information recording and reproducing unit 1 to the third information recording and reproducing unit 3; the third information recording and reproducing unit 3 is used for irradiating the transmitted light from the second information recording and reproducing unit 2 onto the optical information recording medium.

[0024] Specifically, in this embodiment, each information recording and reproducing unit can be independently servo-controlled to realize ultra-high-speed recording and reproducing of multiple tracks. The recording and reproducing speed can be increased to 180M / S, which is 3 times the recording and reproducing speed of traditional optical heads and has a lower bit error rate. It can be used for recording and reproducing of multi-layer and ultra-multi-layer optical discs in the future, and is easy to promote and use. At the same time, the optical head has an innovative optical path design, efficient space utilization, compact structural layout, and lower production cost, achieving the goal of ultra-high-speed recording and reproducing with a lower bit error rate.

[0025] In a specific embodiment, the first information recording and reproducing unit 1 includes a first biasing element 11, a first collimating lens 12, a second biasing element 13 and a first objective lens assembly 14;

[0026] The first biasing element 11 is used to transmit the outgoing light from the blue light source A to the first collimating lens 12 and reflect it to the second information recording and reproducing unit 2 respectively, the first collimating lens 12 is used to transmit the transmitted light from the first biasing element 11 to the second biasing element 13, and the second biasing element 13 is used to reflect the transmitted light from the first collimating lens 12 to the first objective lens assembly 14;

[0027] The second information recording and reproducing unit 2 includes a third biasing element 21, a second collimating lens 22, a fourth biasing element 23 and a second objective lens assembly 24;

[0028] The third biasing element 21 is used to reflect the reflected light from the first biasing element 11 to the second collimating lens 22 and transmit it to the third information recording and reproducing unit 3, the second collimating lens 22 is used to transmit the reflected light from the third biasing element 21 to the fourth biasing element 23, and the fourth biasing element 23 is used to reflect the transmitted light from the second collimating lens 22 to the second objective lens assembly 24;

[0029] The third information recording and reproducing unit 3 includes a fifth biasing element 31, a third collimating lens 32, a sixth biasing element 33 and a third objective lens assembly 34;

[0030] The fifth biasing element 31 is used to reflect the transmitted light from the third biasing element 21 to the third collimating lens 32, the third collimating lens 32 is used to transmit the reflected light from the fifth biasing element 31 to the sixth biasing element 33, and the sixth biasing element 33 is used to reflect the transmitted light from the third collimating lens 32 to the third objective lens assembly 34.

[0031] In a specific embodiment, a blue-ray optical head with ultra-high-speed recording and reproducing capability further includes a first light quantity detection component 4, a second light quantity detection component 5 and a third light quantity detection component 6;

[0032] The second biasing element 13 is used to transmit the transmitted light from the first collimating lens 12 to the first light quantity detection component 4, and the first light quantity detection component 4 monitors the light output of the first information recording and reproducing unit 1 according to the incident light;

[0033] The fourth biasing element 23 is used to transmit the transmitted light from the second collimating lens 22 to the second light quantity detection component 5, and the second light quantity detection component 5 monitors the light output of the second information recording and reproducing unit 2 according to the incident light;

[0034] The sixth biasing element 33 is used to transmit the transmitted light from the third collimating lens 32 to the third light quantity detection component 6. The third light quantity detection component 6 monitors the light output of the third information recording and reproducing unit 3 according to the incident light.

[0035] In a specific embodiment, a blue-ray optical head with ultra-high-speed recording and reproducing capability further includes a first signal detection component 7, a second signal detection component 8 and a third signal detection component 9;

[0036] The first signal detection component 7 is used to detect the reflected light reflected by the optical information recording medium and incident through the first information recording and reproducing unit 1;

[0037] The second signal detection component 8 is used to detect the reflected light reflected by the optical information recording medium and incident through the second information recording and reproducing unit 2;

[0038] The third signal detection component 9 is used to detect the reflected light reflected by the optical information recording medium and incident through the third information recording and reproducing unit 3.

[0039] In a specific embodiment, the first signal detection component 7 includes a seventh biasing element 71, a first detection mirror component 72 and a first photodetector 73;

[0040] The seventh biasing element 71 is used to reflect the reflected light reflected by the optical information recording medium and incident via the first information recording and reproducing unit 1 to the first detection mirror assembly 72, the first detection mirror assembly 72 is used to focus the incident light to the first photodetector 73, and the first photodetector 73 is used to perform light detection;

[0041] The second signal detection component 8 includes a second detection mirror component 81 and a second photodetector 82;

[0042] The second detection mirror assembly 81 is used to focus the reflected light reflected by the optical information recording medium and incident via the second information recording and reproducing unit onto the second photodetector 82, and the second photodetector 82 is used to perform light detection;

[0043] The third signal detection component 9 includes a third detection mirror component 91 and a third photodetector 92;

[0044] The third detection mirror assembly 91 is used to focus the reflected light reflected by the optical information recording medium and incident via the third information recording and reproducing unit 3 onto the third photodetector 92, and the third photodetector 92 is used to perform light detection;

[0045] In a specific embodiment, the first objective lens assembly 14, the second objective lens assembly 24 and the third objective lens assembly 34 all include A wave plate 141, an objective lens 241 and a servo control element 341 disposed opposite to each other on both sides of the objective lens;

[0046] Said The wave plate 141 is used to convert the incident light into circularly polarized light;

[0047] The objective lens 241 is used to focus the incident circularly polarized light onto the optical information recording medium;

[0048] The servo control element 341 is used to control the focus and tracking servo.

[0049] In this embodiment, the working process of the blue light optical head is as follows: the wavelength range of the blue light source A is 400-410nm, and the blue light source A emits a P polarized light that vibrates in the horizontal direction. After passing through the wave plate B, it will become S polarized light vibrating in the vertical direction. The S polarized light first enters the seventh biasing element 71. The surface characteristics of the seventh biasing element 71 are as follows: 100% transmission of S polarized light, 100% reflection of P polarized light; the S polarized light passes through the seventh biasing element 71 and enters the first biasing element 11. The surface characteristics of the first biasing element 11 are as follows: 34% transmission of S polarized light, 100% transmission of P polarized light; the S polarized light transmitted by the first biasing element 11 becomes a parallel light beam after passing through the first collimating lens 12, and then passes through the second biasing element 13 placed at 45°. The surface characteristics of the second biasing element 13 are as follows: 3% transmission of S polarized light, 100% reflection of P polarized light; the S polarized light transmitted by the second biasing element 13 enters the first light quantity detection component 4, and the S polarized light reflected by the second biasing element 13 passes through The circularly polarized light is converted into circularly polarized light after passing through the wave plate. The circularly polarized light is focused onto the optical information recording medium after passing through the objective lens. The servo control elements arranged on both sides of the objective lens can respectively perform focusing and tracking servo control to realize the recording and regeneration function; the S polarized light reflected by the first biasing element 11 will enter the third biasing element 21. The surface characteristics of the third biasing element 21 are as follows: 50% transmission of S polarized light, 100% transmission of P polarized light. The S polarized light reflected by the third biasing element 21 is converted into a parallel light beam after passing through the second collimating lens 22, and then passes through the fourth biasing element 23 placed at 45°. The surface characteristics of the fourth biasing element 23 are as follows: 3% transmission of S polarized light, 100% reflection of P polarized light; the S polarized light transmitted by the fourth biasing element 23 enters the second light quantity detection component 5, and the S polarized light reflected by the fourth biasing element 23 passes through After passing through the wave plate, it becomes circularly polarized light. After passing through the objective lens, the circularly polarized light is focused onto the optical information recording medium. Servo control elements are also symmetrically arranged on both sides of the objective lens, which can perform focusing and tracking servo control respectively to realize the recording and regeneration function; the S polarized light transmitted by the third biasing element 21 will enter the fifth biasing element 31. The surface characteristics of the fifth biasing element 31 are as follows: 100% reflection of S polarized light, 100% transmission of P polarized light. The S polarized light reflected by the fifth biasing element 31 becomes a parallel light beam after passing through the third collimating lens 32, and then passes through the sixth biasing element 33 placed at 45°. The surface characteristics of the sixth biasing element 33 are as follows: 3% transmission of S polarized light, 100% reflection of P polarized light; the S polarized light transmitted by the sixth biasing element 33 enters the third light quantity detection component 6, and the S polarized light reflected by the sixth biasing element 33 passes through The circularly polarized light is converted into circularly polarized light after passing through the objective lens, and is focused onto the optical information recording medium. Servo control elements are symmetrically arranged on both sides of the objective lens, which can perform focusing and tracking servo control respectively, thereby realizing recording and reproducing operations.

[0050] Specifically, after the light spot of the first information recording and reproducing unit reaches the optical information recording medium, the circularly polarized light reflected by the optical information recording medium passes through the objective lens and becomes a parallel light beam. After passing through the wave plate, the light becomes P polarized light and reaches the second biasing element 13. The second biasing element 13 can 100% reflect the P polarized light. After being reflected by the second biasing element 13, the light enters the first collimating lens 12. After passing through the first collimating lens 12, the light enters the first biasing element 11. The first biasing element 11 can 100% transmit the P polarized light. After passing through the first biasing element 11, the light enters the seventh biasing element 71. The seventh biasing element 71 can 100% reflect the P polarized light. The P polarized light reflected by the seventh biasing element 71 enters the first detection mirror assembly 72 and then focuses on the first photodetector 73 to detect the CD signal.

[0051] Similarly, after the light spot of the second information recording and reproducing unit reaches the optical information recording medium, the circularly polarized light reflected by the optical information recording medium passes through the objective lens and becomes a parallel light beam. After passing through the wave plate, the light becomes P polarized light and reaches the fourth biasing element 23. The fourth biasing element 23 can reflect P polarized light 100%. After being reflected by the fourth biasing element 23, the light enters the second collimating lens 22. After passing through the second collimating lens 22, the light enters the third biasing element 21. The third biasing element 21 can transmit P polarized light 100%. After the P polarized light transmitted by the third biasing element 21 enters the second detection mirror assembly 81, it is then focused on the second photodetector 82 to detect the CD signal.

[0052] Similarly, after the light spot of the third information recording and reproducing unit reaches the optical information recording medium, the circularly polarized light reflected by the optical information recording medium passes through the objective lens and becomes a parallel light beam. After passing through the wave plate, the light becomes P polarized light and reaches the sixth biasing element 33. The sixth biasing element 33 can 100% reflect the P polarized light. After being reflected by the sixth biasing element 33, the light enters the third collimating lens 32. After passing through the third collimating lens 32, the light enters the fifth biasing element 31. The fifth biasing element 31 can 100% transmit the P polarized light. The P polarized light transmitted by the fifth biasing element 31 enters the third detection mirror assembly 91 and then is focused on the third photodetector 92 to detect the CD signal.

[0053] Specifically, in this embodiment, the first light detection component 4, the second light detection component 5 and the third light detection component 6 monitor the light output of the three light paths in real time to control the light output intensity of the blue light source A in real time to ensure stable recording and regeneration.

[0054] Specifically, in this embodiment, the three objective lens assembly circuits are all independently driven and controlled, so that multiple tracks can be recorded and reproduced simultaneously, increasing the recording and reproduction speed to three times that of a traditional optical head. At the same time, it is also possible to achieve independent regeneration, verification and confirmation of multiple objective lenses on the same track, so as to further reduce the bit error rate and improve the accuracy of information output.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A blue-ray optical head with ultra-high-speed recording and reproducing capability, characterized in that: A first information recording and reproducing unit (1), a second information recording and reproducing unit (2) and a third information recording and reproducing unit (3); The first information recording and reproducing unit (1) is used to irradiate the outgoing light from the blue light source onto the optical information recording medium, and at the same time reflect the outgoing light from the light source to the second information recording and reproducing unit (2); The second information recording and reproducing unit (2) is used to irradiate the reflected light from the first information recording and reproducing unit (1) onto the optical information recording medium, and transmit the reflected light from the first information recording and reproducing unit (1) to the third information recording and reproducing unit (3); The third information recording and reproducing unit (3) is used to irradiate the transmitted light from the second information recording and reproducing unit (2) onto the optical information recording medium.

2. The blue-ray optical head with ultra-high-speed recording and reproducing capability according to claim 1, characterized in that: The first information recording and reproducing unit (1) comprises a first biasing element (11), a first collimating lens (12), a second biasing element (13) and a first objective lens assembly (14); The first biasing element (11) is used to transmit the outgoing light from the blue light source to the first collimating lens (12) and reflect it to the second information recording and reproducing unit (2), the first collimating lens (12) is used to transmit the transmitted light from the first biasing element (11) to the second biasing element (13), and the second biasing element (13) is used to reflect the transmitted light from the first collimating lens (12) to the first objective lens assembly (14); The second information recording and reproducing unit (2) comprises a third biasing element (21), a second collimating lens (22), a fourth biasing element (23) and a second objective lens assembly (24); The third biasing element (21) is used to reflect the reflected light from the first biasing element (11) to the second collimating lens (22) and transmit it to the third information recording and reproducing unit (3); the second collimating lens (22) is used to transmit the reflected light from the third biasing element (21) to the fourth biasing element (23); and the fourth biasing element (23) is used to reflect the transmitted light from the second collimating lens (22) to the second objective lens assembly (24); The third information recording and reproducing unit (3) comprises a fifth biasing element (31), a third collimating lens (32), a sixth biasing element (33) and a third objective lens assembly (34); The fifth biasing element (31) is used to reflect the transmitted light from the third biasing element (21) to the third collimating lens (32), the third collimating lens (32) is used to transmit the reflected light from the fifth biasing element (31) to the sixth biasing element (33), and the sixth biasing element (33) is used to reflect the transmitted light from the third collimating lens (32) to the third objective lens assembly (34).

3. The blue-ray optical head with ultra-high-speed recording and reproducing capability according to claim 2, characterized in that: It also includes a first light quantity detection component (4), a second light quantity detection component (5) and a third light quantity detection component (6); The second biasing element (13) is used to transmit the transmitted light from the first collimating lens (12) to the first light quantity detection component (4), and the first light quantity detection component (4) monitors the light output quantity of the first information recording and reproducing unit (1) according to the incident light; The fourth biasing element (23) is used to transmit the transmitted light from the second collimating lens (22) to the second light quantity detection component (5), and the second light quantity detection component (5) monitors the light output quantity of the second information recording and reproducing unit (2) according to the incident light; The sixth biasing element (33) is used to transmit the transmitted light from the third collimating lens (32) to the third light quantity detection component (6), and the third light quantity detection component (6) monitors the light output quantity of the third information recording and reproducing unit (3) according to the incident light.

4. The blue-ray optical head with ultra-high-speed recording and reproducing capability according to claim 2, characterized in that: It also includes a first signal detection component (7), a second signal detection component (8) and a third signal detection component (9); The first signal detection component (7) is used to detect the reflected light reflected by the optical information recording medium and incident through the first information recording and reproducing unit (1); The second signal detection component (8) is used to detect the reflected light reflected by the optical information recording medium and incident through the second information recording and reproducing unit (2); The third signal detection component (9) is used to detect the reflected light reflected by the optical information recording medium and incident through the third information recording and reproducing unit (3).

5. The blue-ray optical head with ultra-high-speed recording and reproducing capability according to claim 2, characterized in that: The first signal detection component (7) comprises a seventh biasing element (71), a first detection mirror component (72) and a first photodetector (73); The seventh biasing element (71) is used to reflect the reflected light reflected by the optical information recording medium and incident via the first information recording and reproducing unit (1) to the first detection mirror assembly (72), the first detection mirror assembly (72) is used to focus the incident light to the first photodetector (73), and the first photodetector (73) is used to perform light detection; The second signal detection component (8) comprises a second detection mirror component (81) and a second photodetector (82); The second detection mirror assembly (81) is used to focus the reflected light reflected by the optical information recording medium and incident via the second information recording and reproducing unit onto the second photodetector (82), and the second photodetector (82) is used to perform light detection; The third signal detection component (9) comprises a third detection mirror component (91) and a third photodetector (92); The third detection mirror assembly (91) is used to focus the reflected light reflected by the optical information recording medium and incident via the third information recording and reproducing unit (3) onto the third photodetector (92), and the third photodetector (92) is used for light detection.

6. The blue-ray optical head with ultra-high-speed recording and reproducing capability according to claim 2, characterized in that: The first objective lens assembly (14), the second objective lens assembly (24) and the third objective lens assembly (34) all include A wave plate (141), an objective lens (241), and a servo control element (341) arranged relatively on both sides of the objective lens; Said The wave plate (141) is used to convert the incident light into circularly polarized light; The objective lens (241) is used to focus the incident circularly polarized light onto the optical information recording medium; The servo control element (341) is used to control focusing and tracking servo.

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