Optical module alignment method and alignment device

Abstract

The embodiment of the invention provides an optical module alignment method and an alignment device. The optical module comprises a lens and an optical film, and the optical film can selectively allow polarized light to pass through; the optical module optical axis alignment method comprises the steps that a light source assembly is controlled to emit light, the light passes through an optical module and a reference diaphragm and is received by a first optical detector, and the optical axis angle of the reference diaphragm is determined; controlling the reference diaphragm to rotate; determining the optical axis of the optical film according to the change of the power of the light received by the first optical detector along with the rotation angle of the reference film; acquiring a positioning reference of the lens; and controlling the lens to rotate so as to align the positioning reference of the lens with the optical axis of the optical film.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of optical axis alignment, and more specifically, to an optical module alignment method and an alignment device. Background Art

[0002] At present, the corresponding modules of the pancake solution involve film lamination during the production process. During the film lamination process of the pancake solution, the optical axis is aligned only by CCD positioning reference edge. Because there is a deviation between the optical axis and the reference edge during the production and processing of the absorption polarizer or the reflection polarizer, it is impossible to achieve accurate alignment between the absorption polarizer or the reflection polarizer and the lens, which ultimately affects the optical imaging effect.

[0003] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] The purpose of this application is to provide a new technical solution for an optical module alignment method and an alignment device.

[0005] In a first aspect, the present application provides an optical module including a lens and an optical film, wherein the optical film can selectively allow polarized light to pass through;

[0006] The optical module optical axis alignment method comprises:

[0007] Controlling the light source assembly to emit light so that the light passes through the optical module and the reference diaphragm and is received by the first light detector, wherein the optical axis angle of the reference diaphragm is determined;

[0008] Controlling the reference diaphragm to rotate;

[0009] Determining the optical axis of the optical film according to the change of the power of the light received by the first light detector as the reference film rotates at an angle;

[0010] Obtaining a positioning reference of the lens;

[0011] The lens is controlled to rotate so that the positioning reference of the lens and the optical axis of the optical film are aligned.

[0012] Optionally, determining the optical axis of the optical film according to the change of the power of the light received by the first light detector as the reference film rotates at an angle specifically includes:

[0013] Determining a relationship model between the rotation angle and the power according to the change of the power of the light received by the first light detector as the reference diaphragm rotates at an angle;

[0014] Determine the relationship between the optical axis of the optical film and the optical axis of the reference film according to the relationship model;

[0015] The optical axis of the optical film is determined based on the relationship between the optical axis of the optical film and the optical axis of the reference film.

[0016] Optionally, determining the relationship between the optical axis of the optical film and the optical axis of the reference film according to the relationship model specifically includes:

[0017] determining key power characteristics according to the relationship model;

[0018] The relationship between the optical axis of the optical film and the optical axis of the reference film is determined according to the key power characteristics.

[0019] Optionally, determining the key power feature according to the relationship model specifically includes:

[0020] The power of the light received by the first light detector when it is at a peak position or a trough position is a key power feature.

[0021] Optionally, the relationship model satisfies a sinusoidal function.

[0022] Optionally, obtaining the positioning reference of the lens specifically includes: the positioning reference is a lens cutting edge or a lens point.

[0023] Optionally, emitting light to the optical module so that the light passes through the optical module and the reference diaphragm further comprises:

[0024] A laser is emitted to the optical module, and the laser is divided into a first laser and a second laser by a beam splitter. The first laser is received by the first light detector, and the second laser is received by the second power meter.

[0025] In a second aspect, an optical module alignment device is provided. The optical module alignment device uses the optical module alignment method described in the first aspect to achieve alignment of a lens and an optical film;

[0026] The optical module alignment device comprises: a light source assembly, a reference diaphragm and a first light detector;

[0027] The light source assembly is used to emit light;

[0028] The reference diaphragm is located between the light source assembly and the first light detector;

[0029] The first light detector is used to receive light emitted from the optical module or the reference diaphragm.

[0030] Optionally, the light source assembly includes a light source body and a beam splitter;

[0031] The light source body emits laser light;

[0032] The beam splitter splits the laser light into a first laser light and a second laser light, and the first laser light is transmitted to the first photodetector.

[0033] Optionally, the optical module alignment device further includes a second light detector, and the second light detector receives the second laser.

[0034] According to an embodiment of the present application, a reference diaphragm is introduced and the optical axis of the optical film is determined in combination with the light energy monitored in real time by the first light detector. Then, the positioning reference of the rotating lens is acquired in real time, and the positioning reference of the lens and the optical axis of the optical film are aligned, thereby improving the alignment accuracy of the optical module.

[0035] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0037] Figure 1 Shown is a flow chart of an optical module alignment method provided in an embodiment of the present application.

[0038] Figure 2 Shown is a schematic structural diagram of an optical module alignment device provided in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 10. Light source body; 11. Beam splitter;

[0041] 2. First photodetector; 3. Second photodetector; 4. Reference diaphragm;

[0042] 51. Lens; 52. Optical film; 6. CCD camera. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0045] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] An optical module is generally a combination of a lens and an optical film aligned together. Usually, a polarizing film (POL film) and a lens are aligned, or a reflective polarizing film (RP film) and a lens are aligned. An optical module is an optical module that can form a folded light path. The imaging quality of the optical module will be affected by the alignment angle of the lens and the optical film. Slight angle differences will seriously affect the imaging effect, as well as the user experience and eye comfort. Therefore, it is very necessary to improve the accuracy of the optical module alignment.

[0049] Taking the alignment of polarizing film (POL film) and lens as an example, in the prior art, the optical axis of the base POL film is cut to form an alignment edge, and the alignment edge of the POL film and the cut edge of the lens are aligned to achieve alignment of the lens and the POL optical axis.

[0050] However, in the alignment method of the prior art, when the film is cut to form the alignment edge, there will be a cutting error between the alignment edge and the optical axis of the film. When the film and the lens are aligned, there will also be an alignment angle error between the alignment edge of the film and the cut edge of the lens. The accumulation of multiple errors reduces the accuracy of the alignment of the lens and the optical film.

[0051] Based on the above problems, the first aspect of the embodiment of the present application provides an optical module alignment method. The optical module includes a lens 51 and an optical film 52, and the optical film 52 can selectively allow polarized light to pass through. For example, the optical film 52 can be a polarizing film (POL film) or a reflective polarizing film (RP film).

[0052] Reference Figure 1 , the optical module optical axis alignment method comprises the following steps:

[0053] Step S101: Control the light source assembly to emit light, so that the light passes through the optical module and the reference diaphragm 4 and is received by the first light detector 2, wherein the optical axis angle of the reference diaphragm 4 is determined and can selectively allow polarized light to pass through.

[0054] Step S102: controlling the reference diaphragm 4 to rotate;

[0055] Step S103: determining the optical axis of the optical film 52 according to the change of the power of the light received by the first light detector 2 as the reference film 4 rotates at an angle;

[0056] Step S104: obtaining a positioning reference of the lens 51;

[0057] Step S105 : controlling the lens 51 to rotate so that the positioning reference of the lens 51 and the optical axis of the optical film 52 are aligned.

[0058] In step S101, both the optical film 52 and the reference film 4 can selectively allow polarized light to pass through. For example, the optical film 52 can be a polarizing film (POL film) or a reflective polarizing film (RP film), and the reference film 4 can be a polarizing film (POL film) or a reflective polarizing film (RP film). The type of the optical film 52 and the type of the reference film 4 can be the same or different.

[0059] Since both the optical film 52 and the reference film 4 can selectively allow polarized light to pass through, the light emitted by the light source component can be polarized light or non-polarized light. Regardless of the type of light emitted by the light source component, the light passes through the optical module and the reference film 4 in sequence and is received by the first light detector 2. The light emitted by the optical module is linearly polarized light, and the reference film 4 receives linearly polarized light. In combination with the vibration direction of the linearly polarized light and the direction of the optical axis of the reference film 4, the first light detector 2 can receive light with different light energies.

[0060] Or no matter what type of light is emitted by the light source assembly, the light passes through the reference diaphragm 4 and the optical module in sequence and is received by the first light detector 2. The light emitted by the reference diaphragm 4 is linearly polarized light, and the optical module receives linearly polarized light. Combined with the vibration direction of the linearly polarized light and the direction of the optical axis of the optical module, the first light detector 2 can receive light with different light energies.

[0061] Therefore, in this step, the type of light emitted from the optical module may not be limited, and the light emitted from the optical module may pass through the reference diaphragm 4 and the optical module in sequence, or the light emitted from the optical module may pass through the optical module and the reference diaphragm 4 in sequence, and the relative positions of the reference diaphragm 4 and the optical module may not be limited.

[0062] In step S102 , the reference diaphragm 4 is controlled to rotate so that light passing through different positions of the reference diaphragm 4 is received by the first light detector 2 .

[0063] For example, the reference diaphragm 4 can be driven to rotate by a driving motor or a driving motor, so that the reference diaphragm 4 rotates relative to the optical module, specifically, the reference diaphragm 4 rotates relative to the optical film 52, for example, it can be rotated 180° or 360°, or the reference diaphragm 4 rotates a greater number of times relative to the optical film 52, so that the power of the light received by the first light detector 2 changes in real time.

[0064] In this step, since the optical axis angle of the reference film 4 (the initial optical axis angle of the reference film 4, i.e., the optical axis angle before the reference film 4 is rotated) is determined, the reference film 4 is rotated relative to the optical film 52, and the optical axis of the optical film 52 can be determined in combination with the rotation angle of the reference film 4. For example, when the first light detector 2 receives the strongest light energy, the optical axis direction of the optical film 52 is consistent with the optical axis direction of the reference film 4; when the first light detector 2 receives the weakest light energy, the optical axis direction of the optical film 52 is perpendicular to the optical axis direction of the reference film 4.

[0065] Step S103: Determine the optical axis of the optical film 52 according to the change of the power of the light received by the first light detector 2 with the rotation angle of the reference film 4. In this step, the first light detector 2 monitors the power of the light received by it in real time, and determines the optical axis of the optical film 52 by combining the power of the light received by the first light detector 2 and the rotation angle of the reference film 4.

[0066] Specifically, since the optical axis angle of the reference diaphragm 4 is known, that is, before the reference diaphragm 4 is rotated, the optical axis angle of the reference diaphragm 4 is known, and the rotation angle of the reference diaphragm 4 can be determined, the optical axis of the optical film 52 can be determined by combining the rotation angle of the reference diaphragm 4, the optical axis angle of the reference diaphragm 4, and the light energy monitored by the first light detector 2.

[0067] Step S104: Acquire the positioning reference of the lens 51. For example, the positioning reference of the lens 51 may be photographed by the CCD camera 6. The positioning reference of the lens 51 may be the cut edge (straight line cut edge) of the lens 51 or the dot of the lens 51.

[0068] Step S105: Control the rotation of the lens 51 to align the positioning reference of the lens 51 with the optical axis of the optical film 52. Specifically, the lens 51 is driven to rotate by a drive motor or a drive motor, and the CCD camera 6 obtains the positioning reference of the lens 51 in real time, and aligns the positioning reference with the optical axis of the optical film 52, thus completing the alignment of the optical module.

[0069] Therefore, in the embodiment of the present application, by introducing the reference film 4 and combining it with the light energy monitored in real time by the first light detector 2, the optical axis of the optical film 52 is determined, and then by acquiring the positioning reference of the rotating lens 51 in real time, the positioning reference of the lens 51 and the optical axis of the optical film 52 are aligned, thereby improving the alignment accuracy of the optical module.

[0070] In one embodiment, determining the optical axis of the optical film 52 according to the change of the power of the light received by the first light detector 2 with the rotation angle of the reference film 4 specifically includes the following steps:

[0071] S1031: determining a relationship model between the rotation angle and the power according to the change of the power of the light received by the first light detector 2 as the reference diaphragm 4 rotates at an angle;

[0072] S1032: Determine the relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4 according to the relationship model;

[0073] S1033: Determine the optical axis of the optical film 52 according to the relationship between the optical axis of the optical film 52 and the optical axis of the reference film.

[0074] In step S1031 , a relationship model between the rotation angle and the power is determined according to the change in the power (light energy) of the light received by the first light detector 2 as the reference diaphragm 4 rotates at an angle.

[0075] Specifically, the optical module and the reference diaphragm 4 are arranged in sequence, and the linearly polarized light emitted by the optical module is absorbed by the reference diaphragm 4, wherein the reference diaphragm 4 is driven to rotate so that the vibration direction of the incident linearly polarized light and the angle of the transmission axis of the reference diaphragm 4 change in real time to change the transmittance of the light emitted from the reference diaphragm 4.

[0076] When the vibration direction of the linear polarized light received by the reference diaphragm 4 is consistent with the transmission axis direction of the reference diaphragm 4, the power is at the highest point in the relationship model between power and rotation angle; when the vibration direction of the linear polarized light received by the reference diaphragm 4 is perpendicular to the transmission axis direction of the reference diaphragm 4, the power is at the lowest point in the relationship model between power and rotation angle.

[0077] Optionally, the reference diaphragm 4 is driven to rotate, and the first light detector 2 monitors the energy of the light it receives in real time to generate a "rotation angle-power" relationship model, and the lowest energy point (i.e., the lowest power point) is determined based on the "rotation angle-power" relationship model.

[0078] It should be noted that the lowest energy point (i.e., the lowest power point) is determined based on the "rotation angle-power" relationship model. When determining the lowest energy point, slight fluctuations in energy are easier to detect. Therefore, it is preferred to determine the optical axis relationship between the optical film 52 and the reference film 4 by determining the lowest energy point.

[0079] In step S1032 , the relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4 is determined according to the relationship model.

[0080] Specifically, the optical module and the reference diaphragm 4 are arranged in sequence, and the linearly polarized light emitted by the optical module is absorbed by the reference diaphragm 4, wherein the reference diaphragm 4 is driven to rotate so that the vibration direction of the incident linearly polarized light and the angle of the transmission axis of the reference diaphragm 4 change in real time to change the transmittance of the light emitted from the reference diaphragm 4.

[0081] When the vibration direction of the linearly polarized light received by the reference film 4 is consistent with the transmission axis direction of the reference film 4 , the power is at the highest point in the power-rotation angle relationship model. At this time, the optical axis direction of the optical film 52 is consistent with the optical axis direction of the reference film 4 .

[0082] When the vibration direction of the linearly polarized light received by the reference film 4 is perpendicular to the transmission axis direction of the reference film 4 , the power is at the lowest point in the power-rotation angle relationship model. At this time, the optical axis direction of the optical film 52 is perpendicular to the optical axis direction of the reference film 4 .

[0083] In step S1033 , the optical axis of the optical film 52 is determined based on the relationship between the optical axis of the optical film 52 and the optical axis of the reference film.

[0084] Specifically, since the optical axis angle of the reference diaphragm 4 is determined and the rotation angle of the reference diaphragm 4 is known, the optical axis of the optical film 52 can be determined based on the optical axis angle of the reference diaphragm 4 (the initial optical axis angle, i.e., the optical axis angle before rotation), the rotation angle of the reference diaphragm 4, and the relationship between the optical axis of the reference diaphragm 4 and the optical axis of the optical film 52.

[0085] Therefore, in this embodiment, the optical axis angle of the optical film 52 can be determined according to the change of the power of the light received by the first light detector 2 along with the rotation angle of the reference film 4 .

[0086] In one embodiment, determining the relationship between the optical axis of the optical film 52 and the optical axis of the reference film according to the relationship model specifically includes:

[0087] determining key power characteristics according to the relationship model;

[0088] The relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4 is determined according to the key power characteristics.

[0089] In this embodiment, determining the relationship between the optical axis of the optical film 52 and the optical axis of the reference film according to the relationship model specifically includes: determining the key power feature according to the relationship model, wherein the key power feature can clearly characterize the relationship between the optical axis of the reference film 4 and the optical axis of the optical film 52, and therefore the key power feature is the power when the power of the light received by the first light detector 2 is at a peak position or a trough position.

[0090] Then, the relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4 is determined based on the key power characteristics. For example, when the power is at the trough position, it proves that the transmission axis of the reference film 4 is perpendicular to the transmission axis of the optical film 52; when the power is at the peak position, it proves that the transmission axis direction of the reference film 4 is consistent with the transmission axis direction of the optical film 52.

[0091] In one embodiment, determining the key power feature according to the relationship model specifically includes:

[0092] The power of the light received by the first light detector 2 when it is at a peak position or a trough position is a key power feature.

[0093] In this embodiment, in the relationship model between power and rotation angle, the power at the peak position and the power at the trough position are both key power characteristics, wherein the power at the trough position is optionally used as the key power characteristic. Specifically, when controlling the rotation of the reference diaphragm 4, the lowest power point is easily detected, which is more conducive to determining the optical axis of the optical film 52 based on the optical axis of the reference diaphragm 4.

[0094] In one embodiment, the relationship model satisfies a sinusoidal function.

[0095] In this embodiment, the reference diaphragm 4 is controlled to rotate so that light passing through different positions of the reference diaphragm 4 is received by the first light detector 2. In this way, a relationship model between power and rotation angle is established according to the change of the power of light received by the first light detector 2 as the rotation angle of the reference diaphragm 4 changes.

[0096] For example, in the process of establishing the relationship model between power and rotation angle, the rotation angle of the reference diaphragm 4 is formed into multiple sampling intervals, and the rotation angle of the reference diaphragm 4 and the power after the first power meter receives the light are sampled multiple times in each sampling interval, and the relationship model between power and rotation angle is established based on the sampling data. Specifically, a surface fitting is performed based on the rotation angle data of the reference diaphragm 4 and the power data of the light received by the first light detector 2 to form a relationship model between power and rotation angle. The relationship model between power and rotation angle determines the relationship between the optical axis of the reference diaphragm 4 and the optical axis of the optical film 52.

[0097] For example, the relationship model between power and rotation angle conforms to a sine function, and when the power is at a trough position or a trough position, it is easy to determine the optical axis angle of the optical film 52. When the optical axis angle of the optical film 52 is determined, during the rotation of the lens 51, the optical axis of the optical film 52 and the positioning reference of the lens 51 are used for alignment.

[0098] In one embodiment, emitting light to the optical module so that the light passes through the optical module and the reference diaphragm 4 further comprises:

[0099] Laser is emitted to the optical module, and is divided into a first laser and a second laser by a beam splitter 11 . The first laser is received by the first light detector 2 , and the second laser is received by the second power meter.

[0100] In this embodiment, before the light passes through the optical module and the reference diaphragm 4, the laser also passes through the beam splitter 11, and the beam splitter 11 splits the laser into a first laser and a second laser, wherein the first laser can be reflected by the beam splitter 11 and passed through the optical module and the reference diaphragm 4 to be received by the first light detector 2, and the second laser is transmitted by the beam splitter 11 and then received by the second light detector 3. For example, the splitting ratio of the beam splitter 11 can be 50:50 or 30:70, etc.

[0101] For example, a laser is projected onto the beam splitter 11 and is divided into a first laser and a second laser by the beam splitter 11. The second laser is incident on the second light detector 3. The second light detector 3 monitors the change of light energy in real time to eliminate the fluctuation of the energy of the laser itself emitted by the light source body 10.

[0102] According to a second aspect of the embodiment of the present application, an optical module alignment device is provided. Figure 2 The optical module alignment device uses the optical module alignment method described above to achieve alignment between the lens 51 and the optical film 52;

[0103] The optical module alignment device comprises: a light source assembly, a reference diaphragm 4 and a first light detector 2;

[0104] The light source assembly is used to emit light;

[0105] The reference diaphragm 4 is located between the light source assembly and the first light detector 2;

[0106] The first light detector 2 is used to receive light emitted from the optical module or the reference diaphragm 4 .

[0107] In this embodiment, the optical module alignment device includes a light source assembly, a first light detector 2 and a reference film 4. The reference film 4 is located between the light source assembly and the first light detector 2. When the optical module alignment device realizes the alignment of the lens 51 and the optical film 52, the optical module composed of the lens 51 and the optical film 52 can be located between the reference film 4 and the light source assembly, and the optical module can also be located between the reference film 4 and the first light detector 2.

[0108] The light source assembly is used to emit light, wherein the light can be polarized light or non-polarized light. Regardless of whether the light is polarized light or non-polarized light, it can be converted into linearly polarized light after passing through the reference film 4 or the optical module, so that the light energy is monitored according to the transmittance of the linearly polarized light (the vibration direction of the linearly polarized light) combined with the first optical power to ensure the relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4, and then according to the relationship between the optical axis of the optical film 52 and the optical axis of the reference film 4, the positioning reference of the lens 51 and the optical axis of the optical film 52 are aligned.

[0109] The reference diaphragm 4 is located between the light source assembly and the first light detector 2. The optical axis angle of the reference diaphragm 4 is known, and the reference diaphragm 4 is also capable of selectively allowing a certain polarized light to pass through. In this way, in the process of controlling the rotation of the reference diaphragm 4, the optical axis of the optical film 52 can be determined by combining the rotation angle of the reference diaphragm 4 and the light energy monitored by the first light detector 2.

[0110] The first light detector 2 is used to receive light emitted from the optical module or the reference film 4 to monitor the light energy in real time, so as to determine the optical axis of the optical film 52 , thereby facilitating the positioning reference of the lens 51 and the optical axis alignment of the optical film 52 .

[0111] The embodiment of the present application provides an optical module alignment device, which improves the positioning reference of the lens 51 and the optical axis alignment accuracy of the optical film 52.

[0112] In one embodiment, the light source assembly includes a light source body 10 and a beam splitter 11;

[0113] The light source body 10 emits laser light;

[0114] The beam splitter 11 splits the laser light into a first laser light and a second laser light, and the first laser light is transmitted to the first light detector 2 .

[0115] In this embodiment, the light source assembly includes a light source body 10 and a beam splitter 11. The light source body 10 emits laser light, for example, the light source body 10 can be a laser. The laser light can be polarized light or unpolarized light. Both the reference diaphragm 4 and the optical film 52 can selectively allow polarized light to pass through. Regardless of whether the laser light is polarized light or unpolarized light, it can be converted into linearly polarized light after passing through the reference diaphragm 4 or the optical film 52. In this way, the light energy is monitored according to the transmittance of the linearly polarized light (the vibration direction of the linearly polarized light) combined with the first optical power to ensure the relationship between the optical axis of the optical film 52 and the optical axis of the reference diaphragm 4, and then according to the relationship between the optical axis of the optical film 52 and the optical axis of the reference diaphragm 4, the positioning reference of the lens 51 and the optical axis of the optical film 52 are aligned.

[0116] The light source assembly also includes a beam splitter 11, which directly receives the laser emitted by the light source body 10 and splits the laser emitted by the light source body 10, thereby realizing the positioning reference of the lens 51 and the optical axis alignment of the optical film 52 while ensuring the stability of the laser energy emitted by the light source body 10.

[0117] In one embodiment, the optical module alignment device further includes a second light detector 3, and the second light detector 3 receives the second laser.

[0118] In this embodiment, the optical module optical axis alignment device also includes a second light detector 3, which receives the second laser to monitor the energy of the second laser in real time to eliminate the possibility that the first light detector 2 monitors the change in light energy due to the energy fluctuation of the light source body 10 itself.

[0119] In addition, the optical module optical axis alignment device also includes a CCD camera 6 , which acquires the positioning reference of the lens 51 in real time, so as to align the positioning reference of the lens 51 with the optical axis of the optical film 52 .

[0120] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0121] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An optical module alignment method, characterized in that: The optical module includes a lens and an optical film, wherein the optical film can selectively allow polarized light to pass through; The optical module optical axis alignment method comprises: Controlling the light source assembly to emit light so that the light passes through the optical module and the reference diaphragm and is received by the first light detector, wherein the optical axis angle of the reference diaphragm is determined; Controlling the reference diaphragm to rotate; Determining the optical axis of the optical film according to the change of the power of the light received by the first light detector as the reference film rotates at an angle; Obtaining a positioning reference of the lens; The lens is controlled to rotate so that the positioning reference of the lens and the optical axis of the optical film are aligned.

2. The optical module alignment method according to claim 1, characterized in that: Determining the optical axis of the optical film according to the change of the power of the light received by the first light detector as the reference film rotates at an angle specifically includes: Determine a relationship model between the rotation angle and the power according to the change of the power of the light received by the first light detector as the reference diaphragm rotates at an angle; Determine the relationship between the optical axis of the optical film and the optical axis of the reference film according to the relationship model; The optical axis of the optical film is determined based on the relationship between the optical axis of the optical film and the optical axis of the reference film.

3. The optical module alignment method according to claim 2, characterized in that: Determining the relationship between the optical axis of the optical film and the optical axis of the reference film according to the relationship model specifically includes: determining key power characteristics according to the relationship model; The relationship between the optical axis of the optical film and the optical axis of the reference film is determined according to the key power characteristics.

4. The optical module alignment method according to claim 3, characterized in that: Determining the key power characteristics according to the relationship model specifically includes: The power of the light received by the first light detector when it is at a peak position or a trough position is a key power feature.

5. The optical module alignment method according to claim 2, characterized in that: The relationship model satisfies a sine function.

6. The optical module alignment method according to claim 1, characterized in that: Acquiring the positioning reference of the lens specifically includes: the positioning reference is a lens cutting edge or a lens point.

7. The optical module alignment method according to claim 1, characterized in that: The method further includes: emitting light to the optical module so that the light passes through the optical module and the reference diaphragm. A laser is emitted to the optical module, and the laser is divided into a first laser and a second laser by a beam splitter. The first laser is received by the first light detector, and the second laser is received by the second power meter.

8. An optical module alignment device, characterized in that: The optical module alignment device uses the optical module alignment method described in any one of claims 1 to 7 to achieve alignment of the lens and the optical film; The optical module alignment device comprises: a light source assembly, a reference diaphragm and a first light detector; The light source assembly is used to emit light; The reference diaphragm is located between the light source assembly and the first light detector; The first light detector is used to receive light emitted from the optical module or the reference diaphragm.

9. The optical module alignment device according to claim 8, characterized in that: The light source assembly comprises a light source body and a beam splitter; The light source body emits laser light; The beam splitter splits the laser light into a first laser light and a second laser light, and the first laser light is transmitted to the first photodetector.

10. The optical module alignment device according to claim 9, characterized in that: The optical module alignment device also includes a second light detector, which receives the second laser.

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