Linear polarization cylindrical mirror and quarter-wave plate alignment device

Abstract

The utility model provides an alignment device for a linear polarization cylindrical mirror and a quarter-wave plate, and belongs to the technical field of optical auxiliary equipment. The alignment device comprises a laser collimating and beam expanding assembly and a laser beam expanding assembly, the AR glasses lens alignment assembly comprises a first detector and a lens group, and the lens group is located between the laser and the first detector; the image acquisition assembly comprises a second detector and a semi-reflecting and semi-transmitting reference plate, the semi-reflecting and semi-transmitting reference plate is located between the second detector and the lens group, and a quarter-wave plate and a linear polarization cylindrical mirror are sequentially placed between the lens group and the semi-reflecting and semi-transmitting reference plate; the baffle plate is arranged between the quarter-wave plate and the linear polarization cylindrical mirror; wherein the lens group is used for receiving laser emitted by the laser and transmitting the laser to the first detector and the semi-reflecting and semi-transmitting reference plate, and the first detector and the second detector are both used for receiving the laser and presenting light spots. According to the utility model, the alignment precision of the linear polarization cylindrical mirror and the quarter-wave plate can be effectively improved by using the laser and the lens.

Description

Technical Field

[0001] This utility model belongs to the field of optical auxiliary equipment technology, specifically relating to an alignment device for a linearly polarized cylindrical mirror and a quarter-wave plate. Background Technology

[0002] In the assembly and debugging process of AR (Augmented Reality) glasses, a single lens consists of a linearly polarized cylindrical lens and a quarter-wave plate. The optical axis of the linearly polarized cylindrical lens and the optical axis of the quarter-wave plate need to be adjusted to an angle of 45 degrees. The linearly polarized cylindrical lens has a linearly polarizing film covering the front surface of the cylindrical lens.

[0003] Currently, the traditional method is to adjust the angle between the optical axis of the linearly polarized cylindrical lens and the optical axis of the quarter-wave plate mechanically. Due to the existence of mechanical adjustment deviations, the accuracy of the angle between the optical axis of the linearly polarized cylindrical lens and the optical axis of the quarter-wave plate after adjustment is low, resulting in poor alignment accuracy between the optical axis of the linearly polarized cylindrical lens and the optical axis of the quarter-wave plate, which seriously affects the assembly quality of AR glasses. Utility Model Content

[0004] The technical problem to be solved by this invention is how to improve the alignment accuracy of a linearly polarized cylindrical mirror and a quarter-wave plate. In view of the shortcomings of the prior art, this invention provides an alignment device for a linearly polarized cylindrical mirror and a quarter-wave plate.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] This invention provides an alignment device for a linearly polarizing cylindrical mirror and a quarter-wave plate, comprising:

[0007] A laser collimation and beam expanding assembly, wherein the laser collimation and beam expanding assembly includes a laser;

[0008] AR glasses lens alignment assembly, the AR glasses lens alignment assembly includes a first detector and a lens group, the lens group being located between the laser and the first detector;

[0009] An image acquisition component includes a second detector and a semi-reflective reference plate. The semi-reflective reference plate is located between the second detector and the lens group. A quarter-wave plate and a linearly polarizing cylindrical lens are sequentially placed between the lens group and the semi-reflective reference plate.

[0010] A baffle, the baffle being positioned between the quarter-wave plate and the linearly polarizing cylindrical mirror;

[0011] The lens group is used to receive the laser emitted by the laser and transmit it to the first detector and the semi-reflective reference plate. Both the first detector and the second detector are used to receive the laser and present a light spot.

[0012] Compared to existing technologies, the advantages of this utility model's alignment device for a linearly polarized cylindrical lens and a quarter-wave plate include: The device comprises a laser collimation and beam expanding assembly, an AR glasses lens alignment assembly, an image acquisition assembly, and a baffle. The laser collimation and beam expanding assembly includes a laser that emits laser light. The AR glasses lens alignment assembly includes a first detector and a lens group located between the laser and the first detector. This arrangement allows the laser light emitted to travel in a straight line through the lens group to the first detector, forming a first light spot. Simultaneously, the image acquisition assembly includes a second detector and a semi-reflective reference plate located between the second detector and the lens group. This arrangement allows the lens group to transmit the laser light to the semi-reflective reference plate, and a portion of the laser light is reflected by the reference plate before being transmitted through the lens group to the first detector, forming a second light spot. This allows for better adjustment... When the semi-reflective and semi-transparent reference plate is adjusted so that the first and second light spots coincide, it indicates that the semi-reflective and semi-transparent reference plate is perpendicular to the transmission direction of the laser transmitted to it. Another portion of the laser can pass through the semi-reflective and semi-transparent reference plate and be transmitted to the second detector to form the third light spot. Based on this, when it is necessary to adjust and align the quarter-wave plate and the linearly polarized cylindrical mirror, the linearly polarized cylindrical mirror is first placed between the lens group and the semi-reflective and semi-transparent reference plate. The laser, after passing through the linearly polarized cylindrical mirror and being transmitted to the semi-reflective and semi-transparent reference plate, will have a portion reflected by the reference plate and then transmitted through the linearly polarized cylindrical mirror and the lens group to the first detector to form the fourth light spot. Adjusting the linearly polarized cylindrical mirror so that the fourth light spot coincides with the first light spot indicates that the linearly polarized cylindrical mirror is perpendicularly aligned with the semi-reflective and semi-transparent reference plate. Simultaneously, the laser is rotated so that the brightness of the third light spot formed by the laser through the linearly polarized cylindrical mirror and the semi-reflective and semi-transparent reference plate on the second detector is reduced to its lowest value. This indicates that the optical axis of the linearly polarized cylindrical mirror is aligned with the laser at a 90-degree angle.Next, a baffle and a quarter-wave plate are sequentially placed between the linearly polarizing cylindrical mirror and the semi-reflective reference plate. Part of the laser light is reflected after being transmitted to the quarter-wave plate, and the reflected laser light is transmitted through the lens group to the first detector, forming a fifth light spot. By adjusting the quarter-wave plate, the fifth light spot coincides with the first light spot. This indicates that the quarter-wave plate is perpendicular to the transmission direction of the laser light transmitted to it, and thus the quarter-wave plate is perpendicularly aligned with both the linearly polarizing cylindrical mirror and the semi-reflective reference plate. Based on this, the baffle is removed, allowing part of the laser light to pass sequentially through the linearly polarizing cylindrical mirror and the semi-reflective reference plate. The light is fed to the second detector to form the sixth light spot. The quarter-wave plate is adjusted to make the sixth light spot the brightest. This indicates that the optical axis of the quarter-wave plate is aligned with the laser at a 45-degree angle. Since the optical axis of the linearly polarized cylindrical mirror is aligned with the laser at a 90-degree angle, the optical axis of the quarter-wave plate is now aligned with the optical axis of the linearly polarized cylindrical mirror at a 45-degree angle. Therefore, by overlapping multiple light spots and adjusting their brightness, precise adjustment of the angle between the optical axis of the quarter-wave plate and the optical axis of the linearly polarized cylindrical mirror can be achieved, thereby improving the alignment accuracy between the linearly polarized cylindrical mirror and the quarter-wave plate.

[0013] Optionally, the laser collimating and beam expanding assembly further includes a collimating lens, which is disposed between the laser and the lens group, and the laser and the collimating lens are arranged sequentially along a first direction.

[0014] Optionally, the laser collimating and beam expanding assembly further includes a neutral density filter, which is disposed between the laser and the collimating lens, and the laser, the neutral density filter, and the collimating lens are arranged sequentially along a first direction.

[0015] Optionally, the laser collimating and beam expanding assembly further includes a Powell prism, which is located between the neutral density filter and the collimating lens. The propagation direction of the laser emitted by the laser coincides with the optical axis of the Powell prism, and the front focal point of the collimating lens coincides with the fixed point of the Powell prism.

[0016] Optionally, the lens group includes a right-angle beam splitter and a first imaging objective lens, the right-angle beam splitter and the first imaging objective lens being sequentially distributed between the collimating lens and the first detector, and the collimating lens, the right-angle beam splitter, the first imaging objective lens and the first detector being arranged sequentially along a first direction.

[0017] Optionally, the lens group further includes a cornerstone prism and a right-angle mirror. The cornerstone prism and the right-angle mirror are distributed on both sides of the right-angle beam splitter along the second direction, and the first direction is perpendicular to the second direction. The two mirrors of the cornerstone prism, which are arranged at an acute angle, are located on the side of the cornerstone prism away from the right-angle beam splitter. The right-angle mirror, the semi-reflective and semi-transparent reference plate, and the second detector are arranged sequentially along the first direction. The two mirrors of the right-angle mirror, which are arranged perpendicularly at right angles, are located on the side of the right-angle mirror away from the right-angle beam splitter and the semi-reflective and semi-transparent reference plate. The quarter-wave plate and the linear polarizing cylindrical mirror are placed sequentially between the right-angle mirror and the semi-reflective and semi-transparent reference plate.

[0018] Optionally, the image acquisition component further includes a second imaging objective lens, which is located between the second detector and the semi-reflective and semi-transparent reference plate and is arranged sequentially along the first direction. The working surface of the second imaging objective lens coincides with the front surface of the semi-reflective and semi-transparent reference plate, and the second detector coincides with the image plane of the second imaging objective lens.

[0019] Optionally, both the first imaging objective and the second imaging objective are at least one of a single lens, a cemented doublet lens, or a lens group.

[0020] Optionally, the semi-reflective reference plate includes a plate body and a semi-reflective film, the plate body being located between the second detector and the lens group, and the semi-reflective film covering the surface of the plate body facing away from the second detector.

[0021] Optionally, the laser includes an emitting head and circuit elements, the circuit elements being electrically connected to the emitting head and used to drive the emitting head to emit at least one of the lasers, the lasers being at least one of visible light, ultraviolet light, and infrared light. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] Figure 1 : A schematic diagram of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0024] Figure 2 : A schematic diagram of the structure of the laser collimation and beam expanding assembly in this embodiment of the present invention;

[0025] Figure 3 : A schematic diagram of the first usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0026] Figure 4: A schematic diagram of the structure of the image acquisition component in this embodiment of the present invention;

[0027] Figure 5 : A schematic diagram of the second usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0028] Figure 6 : A schematic diagram of the third usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0029] Figure 7 : A schematic diagram of the fourth usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0030] Figure 8 : A schematic diagram of the fifth usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0031] Figure 9 : A schematic diagram of the sixth usage state of the alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate in this embodiment of the present invention;

[0032] Among them, 1-laser collimation and beam expander assembly, 11-laser, 12-collimating lens, 13-neutral filter, 14-Powell prism, 2-AR glasses lens alignment assembly, 21-first detector, 22-lens group, 221-right-angle beam splitter prism, 222-first imaging objective lens, 223-corner cone prism, 224-right-angle reflector, 3-image acquisition assembly, 31-second detector, 32-semi-reflective reference plate, 33-second imaging objective lens, 4-baffle, 5-quarter-wave plate, 6-linear polarizing cylindrical lens. Detailed Implementation

[0033] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0034] It should be noted that the Y-axis in the attached drawings represents the horizontal direction and is designated as the front-to-back position, with the positive direction of the Y-axis representing the front and the negative direction representing the rear. The X-axis in the attached drawings represents the left-to-right position, with the positive direction of the X-axis representing the right and the negative direction representing the left. It should also be noted that the aforementioned representations of the Y-axis and X-axis are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0036] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0037] An embodiment of this utility model provides an alignment device for a linearly polarized cylindrical lens and a quarter-wave plate, comprising: a laser collimation and beam expanding assembly 1, which includes a laser 11; an AR glasses lens alignment assembly 2, which includes a first detector 21 and a lens group 22, the lens group 22 being located between the laser 11 and the first detector 21; an image acquisition assembly 3, which includes a second detector 31 and a semi-reflective reference plate 32, the semi-reflective reference plate 32 being located between the second detector 31 and the lens group 22, the lens group 22 and the semi-reflective reference plate 32 being used to sequentially place a quarter-wave plate 5 and a linearly polarized cylindrical lens 6; and a baffle 4, which is placed between the quarter-wave plate 5 and the linearly polarized cylindrical lens 6; wherein, the lens group 22 is used to receive the laser emitted by the laser 11 and transmit it to the first detector 21 and the semi-reflective reference plate 32, and both the first detector 21 and the second detector 31 are used to receive the laser and present a light spot.

[0038] In this embodiment, as Figure 1As shown, an alignment device for a linearly polarized cylindrical lens and a quarter-wave plate is constructed by a laser collimating and expanding assembly 1, an AR glasses lens alignment assembly 2, an image acquisition assembly 3, and a baffle 4. The laser collimating and expanding assembly 1 includes a laser 11 that emits laser light. The AR glasses lens alignment assembly 2 includes a first detector 21 and a lens group 22, with the lens group 22 located between the laser 11 and the first detector 21. This configuration allows for... Figure 2 and Figure 3 As shown, after the laser 11 emits a laser beam, the laser beam can be transmitted in a straight line through the lens group 22 to the first detector 21, forming a first light spot on the first detector 21. Simultaneously, the image acquisition component 3 is equipped with a second detector 31 and a semi-reflective reference plate 32, wherein the semi-reflective reference plate 32 is located between the second detector 31 and the lens group 22. This arrangement, as shown... Figure 4 and Figure 5 As shown, the lens group 22 can transmit laser light to the semi-reflective reference plate 32. A portion of the laser light is reflected by the semi-reflective reference plate 32 and then transmitted through the lens group 22 to the first detector 21, forming a second light spot. Thus, when the semi-reflective reference plate 32 is adjusted so that the first and second light spots coincide, it indicates that the semi-reflective reference plate 32 is perpendicular to the transmission direction of the laser light transmitted to it. The remaining portion of the laser light can pass through the semi-reflective reference plate 32 and be transmitted to the second detector 31, forming a third light spot. Based on this, when it is necessary to adjust and align the quarter-wave plate 5 and the linearly polarizing cylindrical mirror 6, such as... Figure 6 As shown, the linearly polarized cylindrical mirror 6 is first placed between the lens group 22 and the semi-reflective reference plate 32. The laser light passes through the linearly polarized cylindrical mirror 6 and is transmitted to the semi-reflective reference plate 32. A portion of the laser light is reflected by the semi-reflective reference plate 32 and then transmitted through the linearly polarized cylindrical mirror 6 and the lens group 22 to the first detector 21, forming a fourth light spot. The linearly polarized cylindrical mirror 6 is adjusted so that the fourth light spot coincides with the first light spot. This indicates that the linearly polarized cylindrical mirror 6 is perpendicularly aligned with the semi-reflective reference plate 32. Simultaneously, as... Figure 7 As shown, the laser 11 is rotated so that the brightness of the third spot formed on the second detector 31 by the linearly polarized cylindrical mirror 6 and the semi-reflective reference plate 32 is reduced to its lowest value. This indicates that the optical axis of the linearly polarized cylindrical mirror 6 is aligned with the laser 11 at a 90-degree angle. Then, as... Figure 8 As shown, a baffle 4 and a quarter-wave plate 5 are sequentially added between the linearly polarizing cylindrical mirror 6 and the semi-reflective reference plate 32. Part of the laser light is reflected after being transmitted to the quarter-wave plate 5. The reflected laser light is then transmitted through the lens group 22 to the first detector 21, forming a fifth light spot. By adjusting the quarter-wave plate 5, the fifth light spot coincides with the first light spot. This indicates that the quarter-wave plate 5 is perpendicular to the transmission direction of the laser light transmitted to it. Therefore, the quarter-wave plate 5 is perpendicularly aligned with both the linearly polarizing cylindrical mirror 6 and the semi-reflective reference plate 32. Based on this, as... Figure 9As shown, after being moved to the baffle 4, part of the laser light can pass through the linearly polarized cylindrical mirror 6 and the semi-reflective and semi-transparent reference plate 32 in sequence and be transmitted to the second detector 31 to form the sixth light spot. The quarter-wave plate 5 is adjusted to make the sixth light spot the brightest. At this time, it means that the optical axis of the quarter-wave plate 5 is aligned with the laser 11 at an angle of 45 degrees. Since the optical axis of the linearly polarized cylindrical mirror 6 is aligned with the laser 11 at an angle of 90 degrees, the optical axis of the quarter-wave plate 5 is aligned with the optical axis of the linearly polarized cylindrical mirror 6 at an angle of 45 degrees. Thus, by overlapping multiple light spots and adjusting the brightness, the angle between the optical axis of the quarter-wave plate 5 and the optical axis of the linearly polarized cylindrical mirror 6 can be precisely adjusted, thereby improving the alignment accuracy between the linearly polarized cylindrical mirror 6 and the quarter-wave plate 5.

[0039] Optionally, the laser collimating and beam expanding assembly 1 further includes a collimating lens 12, which is disposed between the laser 11 and the lens group 22, and the laser 11 and the collimating lens 12 are arranged sequentially along the first direction.

[0040] Specifically, such as Figure 1 As shown, the first direction is the Y-axis direction. The collimating lens 12 is an optical element mainly used to convert the light beam emitted by the light source into a parallel light beam to ensure that the light beam has good directionality and a low divergence angle. The collimating lens 12 can be a single lens or a complex system composed of multiple lenses.

[0041] In this optional embodiment, such as Figure 2 As shown, in order to ensure that the laser emitted by the laser collimation and beam expanding assembly 1 can be stably transmitted along a preset direction, the laser collimation and beam expanding assembly 1 is also provided with a collimating lens 12. The collimating lens 12 is located between the laser 11 and the lens group 22, so that the laser can pass through the collimating lens 12 before being transmitted to the lens group 22, so that the beam emitted by the laser 11 is converted into a parallel beam. At the same time, the laser 11 and the collimating lens 12 are arranged in sequence along the first direction, so that the parallel beam converted by the collimating lens 12 can be stably transmitted along the first direction and finally transmitted to the lens group 22, ensuring that the subsequent transmission direction of the laser to the first detector 21 and the semi-reflective and semi-transparent reference plate 32 through the lens group 22 is stable.

[0042] Optionally, the laser collimating and beam expanding assembly 1 further includes a neutral density filter 13, which is disposed between the laser 11 and the collimating lens 12. The laser 11, the neutral density filter 13 and the collimating lens 12 are arranged sequentially along a first direction.

[0043] Specifically, a neutral density filter (ND filter) 13 is a filter used to reduce the amount of light entering an optical system. Its characteristic is that it hardly changes the color of the light passing through, but only reduces the intensity of the light.

[0044] In this optional embodiment, in order to ensure the stability of the light spot formed by the laser on the first detector 21 and the second detector 31, such as Figure 2 As shown, the laser collimating and beam expanding assembly 1 is also provided with a neutral density filter 13, which is located between the laser 11 and the collimating lens 12. This arrangement allows the laser emitted by the laser 11 to pass through the neutral density filter 13 before being transmitted to the target location. This facilitates the adjustment of the laser intensity by adjusting the neutral density filter 13, ensuring the formation of the light spot. Furthermore, the laser 11, the neutral density filter 13, and the collimating lens 12 are arranged sequentially along the first direction. This ensures that the laser beam adjusted by the neutral density filter 13 and the collimating lens 12 is transmitted stably along the first direction, thereby achieving stable light spot formation on the first detector 21 and the second detector 31. This facilitates the subsequent alignment of the linearly polarized cylindrical mirror 6 and the quarter-wave plate 5 by overlapping the light spots.

[0045] Optionally, the laser collimating and beam expanding assembly 1 also includes a Powell prism 14, which is located between the neutral density filter 13 and the collimating lens 12. The propagation direction of the laser emitted by the laser 11 coincides with the optical axis of the Powell prism 14, and the front focal point of the collimating lens 12 coincides with the fixed point of the Powell prism 14.

[0046] Specifically, the Powell Lens 14 is a special prism design primarily used to homogenize the intensity distribution of a laser beam, such as... Figure 2 As shown, the working principle of the Powell prism 14 is based on the refractive properties of an obliquely incident prism. When a laser beam shines on an obliquely placed prism, light of different wavelengths is refracted at different positions, causing the beam to diverge. However, due to the design of the Powell prism 14, the beam not only refracts but also deflects, resulting in an angular change in the output beam in the direction perpendicular to the prism's incident plane. This angular change causes different parts of the beam to experience different path lengths during propagation, thus effectively averaging the intensity distribution of the beam.

[0047] In this optional embodiment, since multiple light spots need to be formed by the first detector 21 and the second detector 31, the laser beam needs to be divided into multiple sub-beams. To ensure uniform intensity and stable transmission among the multiple sub-beams, such as... Figure 2As shown, the laser collimating and beam expanding assembly 1 is also equipped with a Powell prism 14, which is located between the neutral density filter 13 and the collimating lens 12. After the intensity of the beam emitted by the laser 11 is adjusted by the neutral density filter 13, it can be divided into multiple sub-beams with uniform intensity by the Powell prism 14, and then converted into multiple parallel sub-beams by the collimating lens 12. On this basis, the propagation direction of the laser emitted by the laser 11 is aligned with the optical axis of the Powell prism 14, and the front focal point of the collimating lens 12 is aligned with the fixed point of the Powell prism 14, thereby ensuring that the laser emitted by the laser 11 can be stably converted into multiple parallel sub-beams, which is convenient for subsequent transmission through the lens group 22 to the first detector 21 and the second detector 31 to form multiple stable light spots.

[0048] Optionally, the lens group 22 includes a right-angle beam splitter 221 and a first imaging objective lens 222. The right-angle beam splitter 221 and the first imaging objective lens 222 are sequentially distributed between the collimating lens 12 and the first detector 21. The collimating lens 12, the right-angle beam splitter 221, the first imaging objective lens 222 and the first detector 21 are arranged sequentially along a first direction.

[0049] Specifically, such as Figure 3 As shown, a right-angle beam splitter 221 is an optical element whose main function is to change the propagation direction of a light beam, while also achieving beam splitting. The right-angle beam splitter 221 is typically made of glass and has two mutually perpendicular reflecting surfaces and one incident surface. The basic working principle of the right-angle beam splitter 221 is to use total internal reflection (TIR) ​​to change the propagation direction of the light beam. When light is incident on one right-angle surface of the prism at a 45-degree angle, the light undergoes two total internal reflections and finally exits from the other right-angle surface, thus changing the propagation direction of the light beam by 90 degrees. Of course, the right-angle beam splitter 221 can be configured as a semi-reflective, semi-transparent beam splitter. The first imaging objective lens 222 is an important component of the optical system, mainly used to focus the image of an object onto a sensor or eyepiece.

[0050] In this optional embodiment, such as Figure 3 As shown, to ensure stable laser transmission through the lens group 22, the lens group 22 is equipped with a right-angle beam splitter 221 and a first imaging objective lens 222. The right-angle beam splitter 221 and the first imaging objective lens 222 are sequentially distributed between the collimating lens 12 and the first detector 21. This arrangement, as shown... Figure 3 and Figure 5As shown, part of the laser beam can pass through the right-angle beam splitter 221 to the first detector 21, ensuring the stable formation of the light spot on the first detector 21. At the same time, another part of the laser beam can be refracted by the right-angle beam splitter 221 and transmitted to the second detector 31, thereby ensuring the stable transmission of the laser beam. Based on this, the collimating lens 12, the right-angle beam splitter 221, the first imaging objective lens 222 and the first detector 21 are arranged in sequence along the first direction. This arrangement can ensure the stable transmission of the laser beam along the first direction, thereby realizing the stable formation of the laser beam spot on the first detector 21 and the second detector 31. This facilitates the subsequent alignment of the linearly polarized cylindrical lens 6 and the quarter-wave plate 5 by the overlap of the light spots.

[0051] Optionally, the lens group 22 further includes a corner bevel prism 223 and a right-angle mirror 224. The corner bevel prism 223 and the right-angle mirror 224 are distributed on both sides of the right-angle beam splitter 221 along the second direction, and the first direction is perpendicular to the second direction. The two mirrors of the corner bevel prism 223, which are arranged at an acute angle, are located on the side of the corner bevel prism 223 away from the right-angle beam splitter prism 221. The right-angle mirror 224, the semi-reflective and semi-transparent reference plate 32, and the second detector 31 are arranged sequentially along the first direction. The two mirrors of the right-angle mirror 224, which are arranged at right angles, are located on the side of the right-angle mirror 224 away from the right-angle beam splitter prism 221 and the semi-reflective and semi-transparent reference plate 32, respectively. A quarter-wave plate 5 and a linear polarizing cylindrical mirror 6 are placed sequentially between the right-angle mirror 224 and the semi-reflective and semi-transparent reference plate 32.

[0052] Specifically, such as Figure 1 As shown, the second direction is the X-axis direction; a corner cube prism 223 is an optical element, usually composed of three mutually perpendicular reflective surfaces forming a corner shape. Its main characteristic is that no matter the angle from which the incident light enters, after three internal reflections, the outgoing light is always parallel to the incident light, but in the opposite direction. This means that if a beam of light is reflected through a corner cube prism 223, the returning light will travel along the reverse path of the incident light; a right-angle mirror 224 is a common optical element, usually designed in the shape of a right triangle, with one 90-degree interior angle used to change the direction of light propagation. The main function of the right-angle mirror 224 is to reflect the incident light at a 90-degree angle. Its working principle is based on total internal reflection, which is a phenomenon that occurs when light enters a medium with a lower refractive index from a medium with a higher refractive index.

[0053] In this optional embodiment, such as Figures 5 to 9As shown, to ensure that the laser beam can be stably transmitted through the lens group 22 to the semi-reflective reference plate 32 and stably transmitted to the first detector 21 after reflection by the semi-reflective reference plate 32, the lens group 22 is also provided with a corner bevel prism 223 and a right-angle mirror 224. The corner bevel prism 223 and the right-angle mirror 224 are distributed on both sides of the right-angle beam splitter 221 along the second direction, while the first direction is perpendicular to the second direction. The two mirrors of the corner bevel prism 223, which are arranged at an acute angle, are located on the side of the corner bevel prism 223 away from the right-angle beam splitter 221. The right-angle mirror 224, the semi-reflective reference plate 32, and the second detector 31 are arranged sequentially along the first direction, while the right-angle mirror 224 is arranged on the side opposite to the right-angle beam splitter 221. Two mirrors, arranged perpendicularly at right angles, are located on the side of the right-angle reflector 224 away from the right-angle beam splitter prism 221 and the semi-reflective and semi-transparent reference plate 32, respectively. A quarter-wave plate 5 and a linearly polarizing cylindrical mirror 6 are placed sequentially between the right-angle reflector 224 and the semi-reflective and semi-transparent reference plate 32. With this arrangement, part of the laser beam can be refracted by the right-angle beam splitter prism 221 and the pyramidal prism 223 to the right-angle reflector 224, and then stably transmitted to the semi-reflective and semi-transparent reference plate 32, finally forming a light spot on the second detector 31. The other part of the beam can be reflected by the semi-reflective and semi-transparent reference plate 32, and then refracted by the right-angle beam splitter prism 221 to the first detector 21, finally forming a light spot on the first detector 21.

[0054] Optionally, the image acquisition component 3 further includes a second imaging objective 33, which is located between the second detector 31 and the semi-reflective and semi-transparent reference plate 32 and is arranged sequentially along the first direction. The working surface of the second imaging objective 33 coincides with the front surface of the semi-reflective and semi-transparent reference plate 32, and the image plane of the second detector 31 coincides with the image plane of the second imaging objective 33.

[0055] In this optional embodiment, such as Figure 3 As shown, in order to ensure the stable imaging of the light spot on the second detector 31, the image acquisition component 3 is also provided with a second imaging objective lens 33. The second imaging objective lens 33 is located between the second detector 31 and the semi-reflective and semi-transparent reference plate 32, and is arranged sequentially along the first direction. This allows the laser transmitted through the semi-reflective and semi-transparent reference plate 32 to be refracted by the second imaging objective lens 33, and finally stably form a light spot on the second detector 31 along the first direction. On this basis, the working surface of the second imaging objective lens 33 coincides with the front surface of the semi-reflective and semi-transparent reference plate 32, and the image plane of the second detector 31 coincides with the image plane of the second imaging objective lens 33. This arrangement can ensure that the light spot is clearly imaged on the second detector 31.

[0056] Optionally, the first imaging objective 222 and the second imaging objective 33 are both at least one of a single lens, a cemented doublet lens, or a lens group.

[0057] In this optional embodiment, both the first imaging objective lens 222 and the second imaging objective lens 33 are configured as single lenses, thereby ensuring stable imaging of the light spot on the first detector 21 and the second detector 31. Of course, in other embodiments of this utility model, the first imaging objective lens 222 and the second imaging objective lens 33 may be configured as either a cemented doublet lens or a lens group.

[0058] Optionally, the semi-reflective and semi-transparent reference plate 32 includes a plate body and a semi-reflective and semi-transparent film. The plate body is located between the second detector 31 and the lens group 22, and the semi-reflective and semi-transparent film covers the surface of the plate body opposite to the second detector 31.

[0059] In this optional embodiment, a semi-reflective and semi-transparent reference plate 32 is formed by a plate and a semi-reflective and semi-transparent film. The plate is located between the second detector 31 and the lens group 22 to ensure the stability of the position of the semi-reflective and semi-transparent reference plate 32. On this basis, the semi-reflective and semi-transparent film is covered on the surface of the plate away from the second detector 31. This arrangement ensures that after the laser passes through the semi-reflective and semi-transparent film, part of it is reflected and the other part is transmitted, thereby ensuring the stable formation of the light spot on the first detector 21 and the second detector 31.

[0060] Optionally, the laser 11 includes an emitting head and circuit elements, the circuit elements being electrically connected to the emitting head and used to drive the emitting head to emit at least one type of laser, including at least one of visible light, ultraviolet light, and infrared light.

[0061] In this optional embodiment, in order to ensure the versatility of the laser 11, an emitting head and circuit elements are provided. The circuit elements are electrically connected to the emitting head and can drive the emitting head to emit at least one type of laser, thereby realizing the adjustment of the type of laser emitted by the laser 11. The type of laser includes at least one of visible light, ultraviolet light and infrared light.

[0062] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An alignment device for a linearly polarizing cylindrical mirror and a quarter-wave plate, characterized in that: include: A laser collimating and beam expanding assembly (1), the laser collimating and beam expanding assembly (1) including a laser (11); AR glasses lens alignment assembly (2), the AR glasses lens alignment assembly (2) includes a first detector (21) and a lens group (22), the lens group (22) being located between the laser (11) and the first detector (21); Image acquisition component (3), the image acquisition component (3) includes a second detector (31) and a semi-reflective and semi-transparent reference plate (32), the semi-reflective and semi-transparent reference plate (32) is located between the second detector (31) and the lens group (22), and a quarter-wave plate (5) and a linear polarizing cylindrical mirror (6) are placed between the lens group (22) and the semi-reflective and semi-transparent reference plate (32); A baffle (4) is used to be placed between the quarter-wave plate (5) and the linear polarizing cylindrical mirror (6); The lens group (22) is used to receive the laser emitted by the laser (11) and transmit it to the first detector (21) and the semi-reflective reference plate (32). The first detector (21) and the second detector (31) are both used to receive the laser and present a light spot.

2. The alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate as described in claim 1, characterized in that: The laser collimation and beam expansion assembly (1) further includes a collimating lens (12), which is disposed between the laser (11) and the lens group (22). The laser (11) and the collimating lens (12) are arranged sequentially along a first direction.

3. The alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate as described in claim 2, characterized in that: The laser collimating and beam expanding assembly (1) further includes a neutral density filter (13), which is disposed between the laser (11) and the collimating lens (12). The laser (11), the neutral density filter (13) and the collimating lens (12) are arranged sequentially along a first direction.

4. The alignment device for the linearly polarizing cylindrical mirror and the quarter-wave plate as described in claim 3, characterized in that: The laser collimating and beam expanding assembly (1) also includes a Powell prism (14), which is located between the neutral density filter (13) and the collimating lens (12). The propagation direction of the laser emitted by the laser (11) coincides with the optical axis of the Powell prism (14), and the front focal point of the collimating lens (12) coincides with the fixed point of the Powell prism (14).

5. The alignment apparatus for the linearly polarizing cylindrical mirror and quarter-wave plate as described in any one of claims 2 to 4, characterized in that: The lens group (22) includes a right-angle beam splitter (221) and a first imaging objective (222). The right-angle beam splitter (221) and the first imaging objective (222) are sequentially distributed between the collimating lens (12) and the first detector (21). The collimating lens (12), the right-angle beam splitter (221), the first imaging objective (222) and the first detector (21) are arranged sequentially along a first direction.

6. The alignment device for a linearly polarizing cylindrical mirror and a quarter-wave plate as described in claim 5, characterized in that: The lens group (22) further includes a corner bevel prism (223) and a right-angle mirror (224). The corner bevel prism (223) and the right-angle mirror (224) are distributed on both sides of the right-angle beam splitter (221) along a second direction, with the first direction perpendicular to the second direction. The two mirror surfaces of the corner bevel prism (223) intersecting at an acute angle are both located on the side of the corner bevel prism (223) away from the right-angle beam splitter (221). The right-angle mirror (224) The semi-reflective and semi-transparent reference plate (32) and the second detector (31) are arranged sequentially along the first direction. The two mirrors of the right-angle mirror (224) are arranged at right angles and are respectively located on the side of the right-angle mirror (224) away from the right-angle beam splitter (221) and the semi-reflective and semi-transparent reference plate (32). The quarter-wave plate (5) and the linear polarizing cylindrical mirror (6) are placed sequentially between the right-angle mirror (224) and the semi-reflective and semi-transparent reference plate (32).

7. The alignment device for a linearly polarizing cylindrical mirror and a quarter-wave plate as described in claim 5, characterized in that: The image acquisition component (3) further includes a second imaging objective (33), which is located between the second detector (31) and the semi-reflective and semi-transparent reference plate (32) and is arranged sequentially along the first direction. The working surface of the second imaging objective (33) coincides with the front surface of the semi-reflective and semi-transparent reference plate (32), and the image plane of the second detector (31) coincides with the image plane of the second imaging objective (33).

8. The alignment device for a linearly polarizing cylindrical mirror and a quarter-wave plate as described in claim 7, characterized in that: The first imaging objective (222) and the second imaging objective (33) are both at least one of a single lens, a cemented doublet lens, or a lens group.

9. The alignment apparatus for the linearly polarizing cylindrical mirror and quarter-wave plate as described in any one of claims 1 to 4, characterized in that: The semi-reflective and semi-transparent reference plate (32) includes a plate body and a semi-reflective and semi-transparent film. The plate body is located between the second detector (31) and the lens group (22). The semi-reflective and semi-transparent film covers the surface of the plate body opposite to the second detector (31).

10. The alignment apparatus for the linearly polarizing cylindrical mirror and quarter-wave plate as described in any one of claims 1 to 4, characterized in that: The laser (11) includes a transmitter and a circuit element. The circuit element is electrically connected to the transmitter and is used to drive the transmitter to emit at least one of the lasers. The lasers include at least one of visible light, ultraviolet light and infrared light.

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