Imaging device based on hollow scanning motor and optical scanning equipment thereof

Abstract

The invention provides an imaging device based on a hollow scanning motor and optical scanning equipment thereof. The imaging device based on the hollow scanning motor comprises a lens holder; the focus lens assembly comprises a lens pressing ring and at least one focus lens, the focus lens is fixed to the inner side of the lens seat through the lens pressing ring, and the lens pressing ring is fixed to the lens seat; the wedge mirror assembly comprises a hollow motor, a wedge mirror and a wedge mirror pressing ring, the hollow motor comprises a motor stator, a motor bearing and a motor rotor, the motor stator is fixed to the lens base, the motor bearing abuts against the lens base, and the motor bearing is installed on the outer side of a bearing installation ring arranged on the motor rotor; the wedge mirror is fixed on the motor rotor through the wedge mirror pressing ring, and the wedge mirror pressing ring is fixed on the rear side of the motor rotor; and the detection circuit is mounted on the lens holder and is used for detecting the rotation angle of the wedge lens. According to the technical scheme of the embodiment, the structure of the hollow motor is improved, the matching degree of the hollow motor assembly is improved, and the production cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of scanning imaging equipment, and in particular relates to an imaging device based on a hollow scanning motor and an optical scanning device thereof. Background Art

[0002] Due to its hollow structure, hollow motors can achieve rotational motion and transmit light signals in axial space without interfering with the normal operation of other components of the equipment. Therefore, they are widely used in optical fields such as lidar, optical scanning, and optical imaging.

[0003] However, the existing hollow motors have a complex structure, many components, and high precision requirements, which makes it difficult to match the components of the imaging device using the hollow motor. Summary of the invention

[0004] The embodiment of the present invention provides a hollow scanning motor, which improves the matching degree between components of an imaging device and reduces production costs by improving the structure of the hollow motor.

[0005] In a first aspect, an embodiment of the present invention provides an imaging device based on a hollow scanning motor, comprising:

[0006] Lens holder;

[0007] A focusing lens assembly, the focusing lens assembly comprising a lens pressing ring and at least one focusing lens, the lens pressing ring fixes the focusing lens to the inner side of the lens seat, and the lens pressing ring is fixed to the lens seat;

[0008] At least one wedge mirror assembly, the wedge mirror assembly comprising a hollow motor, a wedge mirror and a wedge mirror pressing ring, the hollow motor comprising a motor stator, a motor bearing and a motor rotor, the motor stator being fixed to the lens seat, the motor bearing being abutted against the lens seat, the motor rotor being provided with a bearing mounting ring, the motor bearing being mounted on the outer side of the bearing mounting ring, the wedge mirror pressing ring fixing the wedge mirror to the motor rotor, and the wedge mirror pressing ring being fixed to the rear side of the motor rotor;

[0009] A detection circuit is installed on the lens holder, and is used to detect the rotation angle of the wedge mirror.

[0010] According to some embodiments of the present invention, a first boss is provided on the inner side of the motor rotor, the wedge mirror pressing ring and the first boss form a wedge mirror groove, and the wedge mirror is installed in the wedge mirror groove.

[0011] According to some embodiments of the present invention, the motor rotor includes a yoke and a magnetic sheet, the front side of the bearing mounting ring is provided with a plurality of protrusions equidistantly distributed along the bearing mounting ring, the magnetic sheet is located between adjacent protrusions, the yoke is fixed to the outer side of the protrusions, the motor stator is provided with a through hole, and the motor stator is fixed to the lens seat through a first connecting member passing through the through hole.

[0012] According to some embodiments of the present invention, it also includes a fixing ring, an off-axis encoder and a zero-point magnet, wherein the fixing ring is fixed to the rear side of the motor rotor, the fixing ring abuts against the rear side of the motor bearing, the zero-point magnet is fixed to the fixing ring, the fixing ring is provided with a second boss, the off-axis encoder abuts against the second boss, and the off-axis encoder and the fixing ring form a glue filling groove.

[0013] According to some embodiments of the present invention, it also includes a bearing outer pressure ring, which is fixed to the rear side of the lens seat, the motor bearing includes a bearing inner ring and a bearing outer ring, balls are arranged between the bearing inner ring and the bearing outer ring, and the inner side of the bearing outer pressure ring abuts against the bearing outer ring.

[0014] According to some embodiments of the present invention, the motor rotor includes a yoke and a magnetic sheet. The yoke is located on the inner side of the motor stator. A plurality of evenly spaced first grooves are provided on the outer side of the yoke. The magnetic sheet is fixed in the first grooves. The bearing mounting ring is integrally formed on the front side of the yoke.

[0015] According to some embodiments of the present invention, the hollow motor further includes a stator sleeve and a stator cover plate, the motor stator is located between the stator sleeve and the stator cover plate, the stator cover plate is fixed to the stator sleeve via a second connecting member, and the stator sleeve is fixed to the lens holder via a third connecting member.

[0016] According to some embodiments of the present invention, it also includes an off-axis encoder and a zero-point magnet, wherein the zero-point magnet and the off-axis encoder are fixed to the wedge lens pressure ring, a second groove is provided on the front side of the wedge lens pressure ring, the off-axis encoder is installed in the second groove, the width of the second groove is greater than the thickness of the off-axis encoder, and the off-axis encoder and the second groove form a glue filling groove.

[0017] According to some embodiments of the present invention, it also includes a bearing inner pressure ring, the motor bearing includes a bearing inner ring and a bearing outer ring, balls are arranged between the bearing inner ring and the bearing outer ring, the bearing inner pressure ring is fixed to the front side of the bearing mounting ring, and the bearing inner pressure ring abuts against the front side of the bearing inner ring.

[0018] In a second aspect, an embodiment of the present invention further provides an optical scanning device, comprising an imaging device based on a hollow scanning motor as described in the first aspect.

[0019] The embodiment of the present invention includes: a lens seat; a focusing lens assembly, the focusing lens assembly includes a lens pressing ring and at least one focusing lens, the lens pressing ring fixes the focusing lens to the inner side of the lens seat, and the lens pressing ring is fixed to the lens seat; at least one wedge mirror assembly, the wedge mirror assembly includes a hollow motor, a wedge mirror and a wedge mirror pressing ring, the hollow motor includes a motor stator, a motor bearing and a motor rotor, the motor stator is fixed to the lens seat, the motor bearing abuts against the lens seat, the motor rotor is provided with a bearing mounting ring, the motor bearing is mounted on the outer side of the bearing mounting ring, the wedge mirror pressing ring fixes the wedge mirror to the motor rotor, and the wedge mirror pressing ring is fixed to the rear side of the motor rotor; a detection circuit, the detection circuit is installed on the lens seat, and the detection circuit is used to detect the rotation angle of the wedge mirror. According to the technical solution of this embodiment, by improving the structure of the hollow motor, the matching degree of the motor stator, the motor bearing and the motor rotor is improved, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a structural schematic diagram of an imaging device based on a hollow scanning motor provided in Embodiment 1 of the present invention;

[0021] Figure 2 is a cross-sectional schematic diagram of an imaging device based on a hollow scanning motor provided in Embodiment 1 of the present invention;

[0022] Figure 3 is a disassembly diagram of an imaging device based on a hollow scanning motor provided in Embodiment 1 of the present invention;

[0023] Figure 4 is a cross-sectional schematic diagram of a fixing ring, an off-axis encoder, and a motor bearing provided in Embodiment 1 of the present invention;

[0024] Figure 5 is a cross-sectional view of a motor rotor provided in Embodiment 1 of the present invention;

[0025] Figure 6 is a structural schematic diagram of an imaging device based on a hollow scanning motor provided in Embodiment 2 of the present invention;

[0026] Figure 7 is a cross-sectional schematic diagram of an imaging device based on a hollow scanning motor provided in Embodiment 2 of the present invention;

[0027] Figure 8 This is a disassembly diagram of an imaging device based on a hollow scanning motor provided in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "target" and the like in the specification, claims or the above drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] Reference Figures 1 to 3 , the imaging device based on the hollow scanning motor provided in this embodiment includes:

[0031] Lens holder 20;

[0032] A focusing lens assembly, the focusing lens assembly comprises a lens pressing ring 10 and at least one focusing lens, the lens pressing ring 10 fixes the focusing lens to the inner side of the lens holder 20, and the lens pressing ring 10 is fixed to the lens holder 20;

[0033] At least one wedge mirror assembly, the wedge mirror assembly includes a hollow motor 40, a wedge mirror and a wedge mirror pressing ring 50, the hollow motor 40 includes a motor stator 41, a motor bearing 43 and a motor rotor 42, the motor stator 41 is fixed to the lens holder 20, the motor bearing 43 abuts against the lens holder 20, the motor rotor 42 is provided with a bearing mounting ring 422, the motor bearing 43 is mounted on the outer side of the bearing mounting ring 422, the wedge mirror pressing ring 50 fixes the wedge mirror to the motor rotor 42, and the wedge mirror pressing ring 50 is fixed to the rear side of the motor rotor 42;

[0034] The detection circuit 30 is installed on the lens holder 20 and is used to detect the rotation angle of the wedge mirror.

[0035] It should be noted that the hollow motor 40 is a frameless servo brushless motor. The frameless hollow motor 40 makes the components of the imaging device based on the hollow scanning motor compact and saves space; the servo brushless hollow motor 40 can more accurately control the rotation angle and rotation speed of the motor rotor 42.

[0036] It should be noted that the imaging device based on the hollow scanning motor needs to include at least one focusing lens and at least one wedge mirror, so that after the laser passes through the imaging device based on the hollow scanning motor, a spatial focusing point can be formed on the plane to be scanned. The lens pressing ring 10 fixes the focusing lens to the inner side of the lens holder 20, and the focusing lens does not rotate. The wedge mirror pressing ring 50 fixes the wedge mirror to the motor rotor 42, and the motor rotor 42 drives the wedge mirror to rotate. The laser is injected by the focusing lens and emitted by the wedge mirror. The motor rotor 42 drives the wedge mirror to rotate, thereby changing the refraction direction and scanning angle of the laser, so that spatial focusing points at different positions can be formed on the plane and the plane can be scanned. The trajectory of the spatial focusing point on the plane is a specific pattern, and the trajectory of the spatial focusing point can be adjusted according to the actual needs during the implementation process.

[0037] It should be noted that the detection circuit 30 is used to detect the rotation angle and zero point position of the wedge mirror, so as to more accurately control the rotation angle of the wedge mirror.

[0038] It should be noted that the motor bearing 43 is in contact with the lens holder 20 , and a boss is provided on the inner side of the lens holder 20 to facilitate the positioning and installation of the motor bearing 43 and provide horizontal limitation for the motor bearing 43 .

[0039] It should be noted that the imaging device based on the hollow scanning motor includes at least one focusing mirror and at least one wedge mirror. If a focusing mirror needs to be added, a focusing mirror assembly needs to be added, and the thickness of the lens holder 20 needs to be increased; if a wedge mirror needs to be added, a wedge mirror assembly needs to be added, that is, the number of hollow motors 40 needs to be increased. One wedge mirror is equipped with one hollow motor 40, so that the rotation speeds of different wedge mirrors are different, that is, the angle combinations between different wedge mirrors are different, thereby realizing spatial focusing points at different positions.

[0040] It should be noted that the bearing mounting ring 422 is added to the motor rotor 42 to facilitate matching of the motor rotor 42 and the motor bearing 43, thereby reducing the assembly time of the hollow motor 40 and improving the assembly efficiency of the imaging device based on the hollow scanning motor.

[0041] It should be noted that the imaging device based on the hollow scanning motor is distributed from front to back as follows: a lens pressure ring 10 , a focusing lens, a lens holder 20 , a detection circuit 30 , a hollow motor 40 , a wedge mirror, and a wedge mirror pressure ring 50 .

[0042] It should be noted that the laser is shot into the focusing mirror from the side away from the wedge mirror and shot out from the side away from the focusing mirror. The motor stator 41 is powered on. Under the action of the electromagnetic induction principle, the motor stator 41 drives the motor rotor 42 to rotate, and the motor rotor 42 drives the wedge mirror to rotate, thereby changing the refraction angle of the laser. The laser passes through the focusing mirror and enters the wedge mirror. After passing through the wedge mirror, the laser hits a spatial focal point on the plane to be scanned. The motor rotor 42 rotates, thereby driving the wedge mirror to rotate, changing the scanning angle of the laser and the position of the spatial focal point of the laser on the plane. The detection circuit 30 is used to detect the rotation angle and rotation speed of the motor rotor 42 and the wedge mirror, so as to more accurately control the rotation angle of the wedge mirror.

[0043] In addition, in one embodiment, referring to Figure 3 and Figure 5 A first boss 421 is provided on the inner side of the motor rotor 42, and the wedge mirror pressing ring 50 and the first boss 421 form a wedge mirror groove, and the wedge mirror is installed in the wedge mirror groove.

[0044] It should be noted that the wedge mirror abuts against the rear side of the first boss 421 and the front side of the wedge mirror pressing ring 50, and a wedge mirror groove is formed between the wedge mirror pressing ring 50 and the first boss 421. The wedge mirror groove can better fix the wedge mirror, and ensure that the wedge mirror pressing ring 50 and the motor rotor 42 can drive the wedge mirror to rotate, and the rotation angles of the wedge mirror and the motor rotor 42, and the wedge mirror and the wedge mirror pressing ring 50 are the same.

[0045] In addition, in the first embodiment, referring to Figure 3 and Figure 5 The motor rotor 42 includes a yoke 424 and a magnetic sheet 425. A plurality of protrusions 423 equidistantly distributed along the bearing mounting ring 422 are arranged on the front side of the bearing mounting ring 422. The magnetic sheet 425 is located between adjacent protrusions 423. The yoke 424 is fixed to the outer side of the protrusion 423. The motor stator 42 is provided with a through hole. The motor stator 42 is fixed to the lens holder 20 through the through hole via a first connecting member.

[0046] It should be noted that the protrusions 423 provide a structural basis for the equidistant distribution of the magnetic sheets 425. Some protrusions 423 are provided with screw holes, and the yoke 424 is provided with through holes. The yoke 424 is fixed to the screw holes of the protrusions 423 by screws and thus fixed to the outside of the protrusions 423, thereby realizing the connection between the yoke 424 and the bearing mounting ring 422 by screws.

[0047] It should be noted that the magnetic sheet 425 is located between the motor stator 41 and the yoke 424, and the magnetic sheet 425 is opposite to the stator coil of the motor stator 41, so that after the motor stator 41 is energized, the magnetic field generated by the energized electronic coil interacts with the magnetic field generated by the uniformly distributed magnetic sheet 425 to drive the motor rotor 42 to rotate.

[0048] It should be noted that, since the bearing mounting ring 422 is located at the rear side of the yoke 424 and the magnetic sheet 425 , the wedge mirror pressing ring 50 is fixed to the bearing mounting ring 422 of the motor rotor 42 .

[0049] It should be noted that a boss is provided on the inner side of the lens holder 20 , so as to facilitate the installation and positioning of the motor stator 41 . The motor stator 41 is fixed to the rear side of the lens holder 20 where the boss is provided.

[0050] It should be noted that the first connecting member may be a screw, and the through hole may be a screw hole. The screw passes through the screw hole provided in the motor stator 41 and is fixed to the lens holder 20, thereby fixing the motor stator 41 to the lens holder 20. By fixing the motor stator 41 to the lens holder 20 by means of screws, there is no need to install the motor stator 41 on the lens holder 20 by means of a traditional press-fitting method. The screws can better control the assembly gap between the motor stator 41 and the lens holder 20, and avoid the imaging device based on the hollow scanning motor from being stuck to each other after assembly. Moreover, the fixing method by screws can better facilitate the subsequent maintenance of the imaging device based on the hollow scanning motor.

[0051] It should be noted that, since installation positions need to be reserved for screws and screw holes, the yoke 424 is connected to the bearing mounting ring 422 via a connector, and the bearing mounting ring 422 is provided with a groove to prevent position conflicts between the screws and screw holes and the bearing mounting ring 422 .

[0052] In addition, in the first embodiment, referring to Figure 3 and Figure 4 , also includes a fixing ring 60, an off-axis encoder 70 and a zero-point magnet 80. The fixing ring 60 is fixed to the rear side of the motor rotor 42. The fixing ring 60 abuts against the rear side of the motor bearing 43. The zero-point magnet 80 is fixed to the fixing ring 60. The fixing ring 60 is provided with a second boss 62. The off-axis encoder 70 abuts against the second boss 62. The off-axis encoder 70 and the fixing ring 60 form a glue potting groove 61.

[0053] It should be noted that, due to the setting of the wedge mirror groove, the rotation angle of the wedge mirror is the same as the rotation angle of the motor rotor 42. The fixed ring 60 is fixed to the motor rotor 42. The detection circuit 30 obtains the zero point and rotation angle of the fixed ring 60 by detecting the signals emitted by the off-axis encoder 70 and the zero point magnet 80 fixed to the fixed ring 60. The zero point and rotation angle of the fixed ring 60 are the zero point and rotation angle of the wedge mirror.

[0054] It should be noted that the off-axis encoder 70 is used to detect the magnetic ring. The detection circuit 30 is provided with an encoder reader, which can read the signal of the detection magnetic ring and output the rotation angle of the fixed ring 60, that is, the rotation angle of the motor rotor 42 and the wedge mirror.

[0055] It should be noted that the detection circuit 30 includes a magnetic flux detection chip, and the zero-point magnet 80 outputs a zero-point signal when passing through the magnetic flux detection chip, so that the detection circuit 30 can achieve more accurate motor zero-point positioning, and achieve real-time zero-point signal reception and rotation angle reset and resetting. Whenever the magnetic flux detection chip receives a zero-point signal, the detection circuit 30 resets the detected rotation angle to zero, and the detection circuit 30 can determine the rotation angle and speed of the fixed ring 60, the motor rotor 42 and the wedge mirror according to the off-axis encoder signal. In the implementation process, zero-point magnets 80 of different specifications can be replaced according to different implementation scenarios of the imaging device based on the hollow scanning motor.

[0056] It should be noted that the second boss 62 facilitates the positioning and horizontal limit of the off-axis encoder 70, and enables the off-axis encoder 70 to form a glue potting groove 61 with the fixing ring 60. The glue potting groove 61 is used to fill the potting glue, and the off-axis encoder 70 is fixed by potting glue, which can quickly detect the rotation angle of the motor rotor and the motor zero point. The fixing method is simple and convenient and is convenient for subsequent maintenance work.

[0057] It should be noted that, in addition to the second boss 62 , the fixing ring 60 may be provided with another boss for abutting against the motor bearing 43 , so as to facilitate the positioning of the motor bearing 43 and the limitation in the horizontal direction.

[0058] In addition, in the first embodiment, referring to Figures 1 to 5 , and also includes a bearing outer pressure ring 90, which is fixed to the rear side of the lens holder 20. The motor bearing 43 includes a bearing inner ring and a bearing outer ring. Balls are arranged between the bearing inner ring and the bearing outer ring. The inner side of the bearing outer pressure ring 90 abuts against the bearing outer pressure ring.

[0059] It should be noted that balls are arranged inside the inner ring and the outer ring of the bearing. The inner ring of the bearing rotates with the motor rotor 42, while the outer ring of the bearing is fixed, so that the motor bearing structure is compact and space-saving.

[0060] It should be noted that the motor bearing 43 abuts against the lens holder 20, the bearing outer pressure ring 90, the fixing ring 60 and the bearing mounting ring 422. The fixing ring 60 is provided with a boss to facilitate the positioning of the motor bearing 43 on the fixing ring 60. The boss of the fixing ring 60 and the bearing outer pressure ring 90 fix the motor bearing 43 to the lens holder 20 and the bearing mounting ring 422, thereby better stabilizing the rotating shaft of the hollow motor 40 and ensuring the operating stability of the hollow motor 40.

[0061] It should be noted that, when the hollow motor 40 is an outer rotor motor, the imaging device based on the hollow scanning motor is distributed from front to back as follows: lens pressure ring 10, focusing lens, lens seat 20, detection circuit 30, motor stator 41, motor rotor 42, motor bearing 43, fixing ring 60, off-axis encoder 70, zero point magnet 80, bearing outer pressure ring 90, wedge mirror pressure ring 50.

[0062] It should be noted that, when the hollow motor 40 is an outer rotor motor, the yoke 424 and the magnetic sheet 425 of the motor rotor 42 are located on the outside of the motor stator 41. The screw passes through the screw hole provided in the motor stator 41 to fix the motor stator 41 to the lens holder 20. The yoke 424 is fixed to the outside of the protrusion 423 provided on the front side of the bearing mounting ring 422 of the motor rotor 42 through a connecting piece, and the magnetic sheet 425 is provided between adjacent protrusions 423. The motor bearing 43 is installed on the bearing mounting ring 422, the motor bearing 43 abuts against the fixing ring 60, the detection magnetic ring and the zero point magnet 80 are fixed to the fixing ring 60, the detection circuit 30 is fixed to the lens holder 20, and the detection circuit 30 can receive the electrical signal emitted by the detection magnetic ring and the zero point signal emitted by the zero point magnet 80. The lens pressing ring 10 installs the focusing lens on the lens holder 20, the wedge lens pressing ring 50 is fixed to the bearing mounting ring 422, and the wedge lens pressing ring 50 installs the wedge lens in the wedge lens groove formed by the motor rotor 42 and the wedge lens pressing ring 50. The laser is injected from the side of the focusing lens away from the wedge lens, and is emitted from the side of the wedge lens away from the focusing lens, and a spatial focus point is formed on the plane. The motor stator 41 is connected to the power supply, the motor stator 41 drives the motor rotor 42 to rotate, and the motor rotor 42 drives the wedge lens to rotate, thereby changing the position of the spatial focus point on the plane, and the detection circuit 30 receives the signal of the detection magnetic ring and the zero point magnet 80, and obtains the precise rotation angle, rotation speed and zero point positioning of the motor rotor 42 and the wedge lens.

[0063] In addition, in Example 2, referring to Figure 7 and Figure 8 The motor rotor 42 includes a yoke 424 and a magnetic sheet 425. The yoke 424 is located on the inner side of the motor stator 41. The outer side of the yoke 424 is provided with a plurality of equally spaced first grooves. The magnetic sheet 425 is fixed in the first grooves. The bearing mounting ring 422 is integrally formed on the front side of the yoke 424.

[0064] It should be noted that the motor stator 41 includes a stator coil. When the hollow motor 40 is an inner rotor motor, the motor rotor 42 is located inside the motor stator 41, the yoke 424 and the magnetic sheet 425 are located inside the motor stator 41, and the magnetic sheet 425 is fixed to the outside of the yoke 424 and opposite to the stator coil of the motor stator 41. When the motor stator 41 is powered on, the motor stator 41 drives the motor rotor 42 to rotate under the action of the electromagnetic induction principle.

[0065] It should be noted that the bearing mounting ring 422 and the yoke 424 are integrally formed, which facilitates the installation and matching between the motor bearing 43 and the motor rotor 42 and eliminates the assembly steps of the bearing mounting ring 422 and the yoke 424 .

[0066] It should be noted that the motor stator 41 includes a stator coil. The first grooves are evenly spaced to provide a structural basis for the evenly spaced distribution of the magnetic sheets 425. The magnetic sheets 425 are located between the motor stator 41 and the magnetic yoke 424. The magnetic sheets 425 are opposite to the stator coils of the motor stator 41. After the motor stator 41 is powered on, under the action of the electromagnetic induction principle, the magnetic field generated by the powered electronic coil interacts with the magnetic field generated by the evenly distributed magnetic sheets 425 to drive the motor rotor 42 to rotate.

[0067] It should be noted that a boss is provided on the outer side of the bearing mounting ring 422 to facilitate the installation of the motor bearing 43 on the bearing mounting ring 422 .

[0068] In addition, in Example 2, referring to Figure 8 The hollow motor 40 further includes a stator sleeve 411 and a stator cover 412. The motor stator 41 is located between the stator sleeve 411 and the stator cover 412. The stator cover 412 is fixed to the stator sleeve 411 through a second connecting member, and the stator sleeve 411 is fixed to the lens holder 20 through a third connecting member.

[0069] It should be noted that the motor stator 41 is fixed to the lens holder 20 through the stator sleeve 411, the stator cover plate 412, the second connecting member and the third connecting member. The second connecting member and the third connecting member can be screws, and the stator sleeve 411 and the stator cover plate 412 are both provided with screw holes. By fixing the stator sleeve 411 to the lens holder 20 and the stator cover plate 412 to the stator sleeve 411 with screws, the assembly gap between the lens holder 20 and the stator sleeve 411, the stator sleeve 411 and the motor stator 41, and the motor stator 41 and the stator cover plate 412 can be better controlled to avoid the imaging device based on the hollow scanning motor from getting stuck to each other after assembly, and the screw fixing method can better facilitate subsequent maintenance work.

[0070] It should be noted that a boss is provided on the inner side of the stator sleeve 411 , and the motor stator 41 abuts against the rear side of the boss on the inner side of the stator sleeve 411 and the front side of the stator cover 412 . The stator sleeve 411 and the stator cover 412 form a groove of the motor stator 41 , and the groove of the motor stator 41 is used to position and fix the motor stator 41 .

[0071] In addition, in Example 2, referring to Figures 6 to 8, also includes an off-axis encoder 70 and a zero point magnet 80, the zero point magnet 80 and the off-axis encoder 70 are fixed to the wedge mirror pressing ring 50, a second groove 51 is provided on the front side of the wedge mirror pressing ring 50, the off-axis encoder 70 is installed in the second groove 51, the width of the second groove 51 is greater than the thickness of the off-axis encoder 70, and the off-axis encoder 70 and the second groove 51 form a glue filling groove 61.

[0072] It should be noted that the wedge mirror groove ensures that the rotation angles of the wedge mirror and the wedge mirror pressing ring 50, and the wedge mirror and the motor rotor 42 are the same. The detection circuit 30 measures the zero point and the rotation angle of the wedge mirror pressing ring 50, which is equivalent to measuring the zero point and the rotation angle of the wedge mirror.

[0073] It should be noted that the off-axis encoder 70 is in contact with one side of the second groove 51, and the glue potting groove 61 is between the off-axis encoder 70 and the other side of the second groove 51. The glue potting groove 61 is used to fill the potting glue, and the off-axis encoder 70 is fixed by the glue potting method, which can quickly detect the rotation angle of the hollow motor 40 and the zero point of the hollow motor 40, which is convenient for subsequent maintenance work and prevents the off-axis encoder 70 from getting stuck and causing inaccurate rotation angle detection.

[0074] It should be noted that the off-axis encoder 70 is used to detect the magnetic ring, and the detection circuit 30 is provided with an encoder reader, which can read the signal of the detection magnetic ring, thereby outputting the rotation angle of the wedge mirror pressure ring 50, that is, the rotation angle of the motor rotor 42 and the wedge mirror.

[0075] It should be noted that the detection circuit 30 includes a magnetic flux detection chip, and the zero-point magnet 80 outputs a zero-point signal when passing through the magnetic flux detection chip, so that the detection circuit 30 can achieve more accurate motor zero-point positioning, and achieve real-time zero-point signal reception and rotation angle reset and resetting. Whenever the magnetic flux detection chip receives a zero-point signal, the detection circuit 30 immediately resets the rotation angle of the detected wedge mirror pressing ring to zero, and the detection circuit 30 can determine the rotation angle and speed of the wedge mirror pressing ring 50, the motor rotor 42 and the wedge mirror according to the signal of the off-axis encoder. In the implementation process, zero-point magnets 80 of different specifications can be replaced according to different implementation scenarios of the imaging device based on the hollow scanning motor.

[0076] In addition, in Example 2, referring to Figures 6 to 8 , also includes a bearing inner pressure ring 100, the motor bearing 43 includes a bearing inner ring and a bearing outer ring, a ball is arranged between the bearing inner ring and the bearing outer ring, the bearing inner pressure ring 100 is fixed to the front side of the bearing mounting ring 422, and the bearing inner pressure ring 100 abuts against the front side of the bearing inner ring.

[0077] It should be noted that balls are arranged between the inner ring of the bearing and the outer ring of the bearing. The inner ring of the bearing rotates with the motor rotor 42, while the outer ring of the bearing is fixed, so that the motor bearing structure is compact and space-saving.

[0078] It should be noted that the motor bearing 43 abuts against the lens seat 20, the bearing inner pressure ring 100, the stator sleeve 411 and the bearing mounting ring 422. The bearing inner pressure ring 100 and the bearing mounting ring 422 provide horizontal limit for the motor bearing 43. The stator sleeve 411 is provided with a boss to facilitate the positioning of the motor bearing 43. The boss of the stator sleeve 411 and the lens seat 20 provide vertical limit for the motor bearing 43, thereby better stabilizing the rotating shaft of the hollow motor 40 and ensuring the operating stability of the hollow motor 40.

[0079] It should be noted that, when the hollow motor 40 is an inner rotor motor, the imaging device based on the hollow scanning motor is distributed from front to back as follows: lens pressure ring 10, focusing lens, lens seat 20, detection circuit 30, stator sleeve 411, bearing inner pressure ring 100, motor bearing 43, motor rotor 42, motor stator 41, stator cover plate 412, off-axis encoder 70, zero point magnet 80, wedge mirror pressure ring 50.

[0080] It should be noted that when the hollow motor 40 is an inner rotor motor, the yoke 424 and the magnetic sheet 425 of the motor rotor 42 are located on the inner side of the motor stator 41, the stator sleeve 411 is fixed to the lens holder 20 by screws, the stator cover 412 fixes the motor stator 41 to the stator sleeve 411, the stator cover 412 is fixed to the lens holder 20 by screws, and the magnetic sheet 425 is fixed to the first grooves distributed equidistantly. The motor bearing 43 is mounted on the bearing mounting ring 422 integrally formed with the yoke 424. The detection magnetic ring and the zero point magnet 80 are fixed to the wedge lens pressing ring 50. The detection magnetic ring and the zero point magnet 80 are fixed to the wedge lens pressing ring 50, and the detection circuit 30 is fixed to the lens holder 20, and the detection circuit 30 can receive the electrical signal emitted by the detection magnetic ring and the zero point signal emitted by the zero point magnet 80. The lens pressing ring 10 installs the focusing lens on the lens holder 20, the wedge lens pressing ring 50 is fixed to the bearing mounting ring 422, and the wedge lens pressing ring 50 installs the wedge lens in the wedge lens groove formed by the motor rotor 42 and the wedge lens pressing ring 50. The laser is injected from the side of the focusing lens away from the wedge lens, and is emitted from the side of the wedge lens away from the focusing lens, and a spatial focus point is formed on the plane. The trajectory of the spatial focus point on the plane is a specific pattern, and the trajectory of the spatial focus point can be adjusted according to actual needs. The motor stator 41 is connected to the power supply, the motor stator 41 drives the motor rotor 42 to rotate, and the motor rotor 42 drives the wedge lens to rotate, thereby changing the position of the spatial focus point on the plane, and the detection circuit 30 receives the signals of the detection magnetic ring and the zero point magnet 80 to obtain the precise rotation angle of the wedge lens and its zero point positioning.

[0081] It should be noted that the two embodiments of the present application solve the problem of difficulty in installing and matching various optical materials of an imaging device based on a hollow scanning motor. The present application designs two different imaging devices with hollow motor 40 structures, so that the light apertures of various optical elements can be perfectly matched while achieving the same optical scanning effect.

[0082] In addition, an embodiment of the present invention further provides an optical scanning device, including the imaging device based on the hollow scanning motor as described above.

[0083] It should be noted that the optical scanning device can be the imaging device based on the hollow scanning motor itself, or it can be other devices that use the imaging device based on the hollow scanning motor. This embodiment does not limit the specific type of the optical scanning device, and it only needs to be able to use the above-mentioned imaging device based on the hollow scanning motor.

[0084] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0085] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0086] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An imaging device based on a hollow scanning motor, characterized in that: include: Lens holder; A focusing lens assembly, the focusing lens assembly comprising a lens pressing ring and at least one focusing lens, the lens pressing ring fixes the focusing lens to the inner side of the lens seat, and the lens pressing ring is fixed to the lens seat; At least one wedge mirror assembly, the wedge mirror assembly comprising a hollow motor, a wedge mirror and a wedge mirror pressing ring, the hollow motor comprising a motor stator, a motor bearing and a motor rotor, the motor stator being fixed to the lens seat, the motor bearing being abutted against the lens seat, the motor rotor being provided with a bearing mounting ring, the motor bearing being mounted on the outer side of the bearing mounting ring, the wedge mirror pressing ring fixing the wedge mirror to the motor rotor, and the wedge mirror pressing ring being fixed to the rear side of the motor rotor; A detection circuit is installed on the lens holder, and is used to detect the rotation angle of the wedge mirror.

2. The imaging device based on the hollow scanning motor according to claim 1, characterized in that: A first boss is arranged on the inner side of the motor rotor, the wedge mirror pressing ring and the first boss form a wedge mirror groove, and the wedge mirror is installed in the wedge mirror groove.

3. The imaging device based on the hollow scanning motor according to claim 1 or 2, characterized in that: The motor rotor includes a yoke and a magnetic sheet. The front side of the bearing mounting ring is provided with a plurality of protrusions equidistantly distributed along the bearing mounting ring. The magnetic sheet is located between adjacent protrusions. The yoke is fixed to the outer side of the protrusion. The motor stator is provided with a through hole. The motor stator is fixed to the lens holder through the through hole via a first connecting member.

4. The imaging device based on the hollow scanning motor according to claim 3, characterized in that: Also includes, A fixing ring, an off-axis encoder and a zero-point magnet, wherein the fixing ring is fixed to the rear side of the motor rotor, the fixing ring abuts against the rear side of the motor bearing, the zero-point magnet is fixed to the fixing ring, the fixing ring is provided with a second boss, the off-axis encoder abuts against the second boss, and the off-axis encoder and the fixing ring form a glue filling groove.

5. The imaging device based on the hollow scanning motor according to claim 3, characterized in that: Also includes, The outer pressure ring of the bearing is fixed to the rear side of the lens seat, the motor bearing comprises an inner ring of the bearing and an outer ring of the bearing, balls are arranged between the inner ring of the bearing and the outer ring of the bearing, and the inner side of the outer pressure ring of the bearing abuts against the outer ring of the bearing.

6. The imaging device based on the hollow scanning motor according to claim 1 or 2, characterized in that: The motor rotor includes a yoke and a magnetic sheet. The yoke is located on the inner side of the motor stator. A plurality of equally spaced first grooves are provided on the outer side of the yoke. The magnetic sheet is fixed to the first grooves. The bearing mounting ring is integrally formed on the front side of the yoke.

7. The imaging device based on the hollow scanning motor according to claim 6, characterized in that: The hollow motor further comprises a stator sleeve and a stator cover plate, the motor stator is located between the stator sleeve and the stator cover plate, the stator cover plate is fixed to the stator sleeve via a second connecting member, and the stator sleeve is fixed to the lens holder via a third connecting member.

8. The imaging device based on the hollow scanning motor according to claim 6, characterized in that: Also includes, An off-axis encoder and a zero-point magnet, wherein the zero-point magnet and the off-axis encoder are fixed to the wedge lens pressure ring, a second groove is provided on the front side of the wedge lens pressure ring, the off-axis encoder is installed in the second groove, the width of the second groove is greater than the thickness of the off-axis encoder, and the off-axis encoder and the second groove form a glue filling groove.

9. The imaging device based on the hollow scanning motor according to claim 6, characterized in that: Also includes, The motor bearing comprises a bearing inner ring and a bearing outer ring, balls are arranged between the bearing inner ring and the bearing outer ring, the bearing inner pressure ring is fixed to the front side of the bearing mounting ring, and the bearing inner pressure ring abuts against the front side of the bearing inner ring.

10. An optical scanning device, characterized in that An imaging device based on a hollow scanning motor comprising any one of claims 1 to 9.

Images