CN117213802A - Optical module alignment method and alignment system - Google Patents
Optical module alignment method and alignment system Download PDFInfo
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Abstract
The embodiment of the application provides an optical module alignment method and an optical module alignment system. The optical module alignment method is applied to an optical module alignment system, and the alignment system comprises: the device comprises a light source assembly, a phase delay element, a polarizer and a detection module, wherein an optical module to be aligned is arranged between the light source assembly and the phase delay element; the alignment method comprises the following steps: polarized light of a plurality of view fields is controlled to be projected to the detection module through the optical module to be aligned, the phase delay element and the polarizer in sequence; according to the intensity of the outgoing light of the polarizer received by the detection module, obtaining the polarization parameter of the outgoing light of the optical module to be aligned; determining the optical axis angle of the optical film to be aligned according to the polarization parameters; acquiring a straight edge angle of a lens to be aligned, wherein the straight edge angle is an included angle between a straight edge of the lens and a reference line, and the reference line is a coordinate axis in the vertical direction in a visual camera coordinate system; and rotating the optical film to be aligned based on the polarization parameters and the straight edge angles to realize the alignment of the optical module.
Description
Technical Field
The embodiment of the application relates to the technical field of optical module detection, in particular to an optical module alignment method and an optical module alignment system.
Background
The optical film is an important component of VR bandwidth (folded optical path), and the ability to fold back light multiple times after the lens is attached to the optical film is a key factor in making VR devices portable. The accuracy of the attachment of the optical film is critical to the quality of the VR Pancake image where fine angle deviations of the attachment will severely impact the quality of the image.
At present, the visual alignment of the physical reference of the optical film and the reference of the lens is one of the VR Pancake film pasting modes, but the method brings large errors and can seriously influence the imaging quality of VR Pancake.
Therefore, the accurate alignment technology of the optical axis is required to reduce cost loss and improve the product yield in the film pasting technology, so that the visual effect of VR Pancake and the eye comfort of a user are ensured, and the immersive virtual experience effect of the user is improved.
Disclosure of Invention
The application aims to provide an optical module alignment method and a new technical scheme of an alignment system.
In a first aspect, the present application provides an optical module alignment method. The optical module alignment method is applied to an optical module alignment system, and the alignment system comprises: the device comprises a light source assembly, a phase delay element, a polarizer and a detection module, wherein the phase delay element rotates at angular frequency omega, and an optical module to be aligned is arranged between the light source assembly and the phase delay element; the optical module to be aligned comprises a lens to be aligned and an optical film to be aligned, and the optical film to be aligned can rotate relative to the lens to be aligned; the alignment system further comprises a vision camera under the condition that the optical module to be aligned is arranged between the light source assembly and the phase delay element;
The optical module alignment method comprises the following steps:
polarized light of a plurality of view fields is controlled to sequentially pass through the optical module to be aligned, the phase delay element and the polarizer and then projected to the detection module;
according to the intensity of the outgoing light of the polarizer received by the detection module, obtaining the polarization parameter of the outgoing light of the optical module to be aligned;
determining the optical axis angle of the optical film to be aligned according to the polarization parameters;
acquiring a straight edge angle of the lens to be aligned, wherein the straight edge angle is an included angle between a straight edge of the lens and a reference line, and the reference line is a coordinate axis in a vertical direction in a visual camera coordinate system;
and rotating the optical film to be aligned based on the polarization parameter and the straight edge angle to realize the alignment of the optical module.
Optionally, the optical film is one of a polarizing film, a reflective polarizing film, or a phase retardation film.
Optionally, under the condition that the optical film to be aligned is a phase retardation film, according to the intensity of the light emitted by the polarizer and received by the detection module, obtaining the polarization parameters of the light emitted by the optical module to be aligned as azimuth angle and ellipsometry.
Optionally, under the condition that the optical film to be aligned is a polarizing film or a reflective polarizing film, according to the intensity of the outgoing light of the polarizer received by the detection module, acquiring the polarization parameter of the outgoing light of the optical module to be aligned as an azimuth angle.
Optionally, the phase delay element is a quarter wave plate and the polarizer is a horizontal linear polarizer.
Optionally, the light source assembly includes a polarizer, and before the optical film to be aligned is a phase retardation film, controlling polarized light of multiple fields of view to pass through the optical module to be aligned further includes:
and controlling the angle of the polarizer to be the ideal optical axis angle of the phase delay film to be measured.
Optionally, according to the intensity of the outgoing light of the polarizer received by the detection module, the obtaining the polarization parameter of the outgoing light of the optical module to be aligned specifically includes:
when the included angle between the fast axis of the phase delay element and the horizontal direction is alpha, the intensity of the outgoing light of the polarizer is obtained, wherein alpha=ωt, and t is the rotation time of the phase delay element;
according to the intensity of the outgoing light of the polarizer, obtaining a Stokes vector of the outgoing light of the optical module to be aligned;
And obtaining the polarization parameters of the outgoing light of the optical module to be aligned according to the Stokes vector of the outgoing light of the optical film to be aligned.
Optionally, according to the intensity of the light emitted by the polarizer, obtaining the stokes vector of the light emitted by the optical module to be aligned specifically includes:
acquiring a relation model existing between the intensity of the outgoing light of the polarizer and the Stokes vector of the outgoing light of the optical module to be aligned;
performing Fourier transform on the relation model, and acquiring the Fourier transform coefficient according to the intensity of the emergent light of the polarizer;
and acquiring a Stokes vector of the emergent light of the optical module to be aligned according to the Fourier transform coefficient.
Optionally, the obtaining a relation model existing between the intensity of the polarizer emergent ray and the stokes vector of the emergent ray of the optical film to be aligned specifically includes:
setting the Stokes vector of the outgoing light of the optical module to be aligned as Sm;
according to the Stokes vector Sm, a Stokes vector S' of the light emitted by the phase delay element is obtained;
according to the Stokes vector S', a Stokes vector Sout of the light rays emitted by the polarizer is obtained;
And obtaining a relation model existing between the intensity of the light emitted by the polarizer and the Stokes vector of the light emitted by the optical module to be aligned according to the Stokes vector Sout.
Optionally, according to the Stokes vector S m Obtaining the light rays emitted by the phase delay elementThe tokes vector S' specifically includes:
according to the Stokes vector S m And the Mueller matrix of the phase delay element with the included angle alpha between the fast axis and the horizontal direction is used for obtaining the Stokes vector S' of the emergent light of the phase delay element.
Optionally, obtaining the stokes vector Sout of the polarizer outgoing light according to the stokes vector S' specifically includes:
and obtaining a Stokes vector Sout of the outgoing light of the polarizer according to the Stokes vector S' and the Mueller matrix of the polarizer.
Optionally, the rotation of the phase delay element at an angular frequency ω specifically includes:
the phase delay element is driven to rotate at an angular frequency ω by a stepper motor having steps n, steps aj, α=ωt=n×aj.
In a second aspect, an optical module alignment system is provided, the alignment system comprising:
The device comprises a light source assembly, a phase delay element, a polarizer and a detection module, wherein the phase delay element rotates at an angular frequency omega; the optical module to be aligned comprises a lens to be aligned and an optical film to be aligned, and the optical film to be aligned rotates relative to the lens to be aligned;
the light source component is used for emitting polarized light of a plurality of view fields;
when the optical module to be aligned is placed between the light source assembly and the phase delay element, the optical module to be aligned, the phase delay element, the polarizer and the detection module are sequentially arranged along the same optical axis, and the vision camera is located above the lens to be aligned.
Optionally, the light source assembly includes: a light source, a quick reflector, a lens group and a polarizer, wherein the lens group comprises at least one lens;
light rays emitted by the light source are projected to the optical module to be tested through the quick reflector, the lens group and the polarizer in sequence.
Optionally, a stepper motor is also included, which drives the phase delay element to rotate at an angular frequency ω.
Optionally, the polarizer is a horizontal linear polarizer and the phase retardation element is a quarter-wave plate.
According to the technical scheme provided by the embodiment of the application, the optical axis angle of the optical film is determined by calculating the polarization parameters of the emergent light of the optical module, the straight edge angle of the lens is obtained by the vision camera, and the optical axis angle of the optical film and the straight edge angle of the lens are aligned by rotating the optical film, so that the precise alignment of the optical film and the lens in the optical module is realized.
Other features of the present specification and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description, serve to explain the principles of the specification.
Fig. 1 is a block diagram of an optical module alignment system according to an embodiment of the present application.
Reference numerals illustrate:
1. a light source assembly; 10. a light source; 11. a fast mirror; 12. a first lens; 13. a second lens; 14. a polarizer;
2. an optical module to be aligned; 21. a lens to be aligned; 22. an optical film to be aligned;
3. a phase delay element;
4. a polarizer;
5. a detection module;
6. a vision camera.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Polarizing films are an important component of VR Pancake, which uses polarizing films mainly including POL (polarizing film), RP (reflective polarizing film) and QWP (quarter-phase retardation film), where POL (polarizing film) and RP (reflective polarizing film) are used to selectively reflect and transmit polarized light, and QWP (quarter-phase retardation film) is used to convert the polarization state of a light beam, so that light is converted between circularly polarized light and linearly polarized light.
The optical film physical reference and the reference vision alignment of the lens are commonly used at present. However, the method brings large errors, can deviate from an ideal state by 1-2 degrees, and can seriously influence the imaging quality of VR Pancake.
Based on the technical problems, the embodiment of the application provides a novel alignment method and an alignment system for an optical module, which can rapidly and accurately realize the alignment of the optical module. Specifically, the alignment method and the alignment system for the optical module provided by the embodiment of the application can realize the accurate alignment of the optical film and the lens in the optical module.
The following describes an optical module alignment method and an alignment system according to an embodiment of the present application in detail with reference to the accompanying drawings.
According to an embodiment of the application, an optical module alignment method is provided, and in particular, a method for realizing accurate alignment of a polarized optical axis of an optical film and a lens in a VR Pancake scheme is provided. The optical module alignment method is applied to an optical module alignment system. Referring to fig. 1, the alignment system includes: the device comprises a light source assembly 1, a phase delay element 3, a polarizer 4 and a detection module 5, wherein the phase delay element 3 rotates at an angular frequency omega, and an optical module 2 to be aligned is arranged between the light source assembly 1 and the phase delay element 2; the optical module to be aligned 2 includes a lens to be aligned 21 and an optical film to be aligned 22, and the optical film to be aligned 22 is rotatable relative to the lens to be aligned 21;
In the case that the optical module to be aligned 2 is disposed between the light source assembly 1 and the phase delay element 3, the detection system further includes a vision camera 6;
the optical axis alignment method of the optical module comprises the following steps:
step 1: polarized light of a plurality of view fields is controlled to sequentially pass through the optical module to be aligned 2, the phase delay element and the polarizer and then projected to the detection module;
step 2: according to the intensity of the outgoing light of the polarizer received by the detection module, obtaining the polarization parameter of the outgoing light of the optical module 2 to be aligned;
step 3: determining the optical axis angle of the optical film 22 to be aligned according to the polarization parameters of the light rays emitted by the optical module 2 to be aligned;
step 4: acquiring a straight edge angle of the lens 21 to be aligned, wherein the straight edge angle is an included angle between a straight edge of the lens and a reference line, and the reference line is a coordinate axis in a vertical direction in a visual camera coordinate system;
step 5: and rotating the optical film based on the polarization parameters and the straight edge angles to realize the alignment of the optical module.
According to the optical module alignment method provided by the embodiment of the application, the optical module to be aligned is placed between the light source component 1 and the phase delay element 3, and the lens and the optical film in the optical module are aligned accurately. Wherein polarized light exiting from the light source module 1 may pass through the optical film before passing through the lens to the phase delay element 3, or polarized light exiting from the light source module 1 may pass through the lens before passing through the optical film to the phase delay element 3. The order of arrangement of the lenses and the optical films in this embodiment is not limited.
Specifically, the phase delay element 3 rotating at the angular frequency ω detects the polarization parameter of the outgoing light of the optical module in combination with the polarizer 4 and the detection module 5, determines the optical axis angle of the optical film according to the polarization parameter of the outgoing light of the optical module, and obtains the straight edge angle of the lens through the vision camera 6, so as to realize the precise alignment of the optical module based on the optical axis angle of the optical film and the right angle of the lens. For example, the optical axis angle of the optical film is 1 ° with respect to the straight edge angle of the lens to be aligned, and what is actually desired is: the optical axis angle of the optical film is 0 degree relative to the straight edge angle of the lens to be aligned, the optical film can be rotated at the moment, and the optical axis angle of the optical film is adjusted, so that the optical axis angle of the optical film is 0 degree relative to the right angle of the lens to be aligned, and the accurate alignment of the optical module is realized.
In step 1, polarized light of a plurality of fields of view is controlled to be projected to the detection module 5 sequentially through the optical module to be aligned, the phase delay element 3 and the polarizer 4. For example, the optical module includes a lens to be aligned and an optical module to be aligned, the light source assembly 1 emits linearly polarized light with multiple fields of view, and the linearly polarized light with multiple fields of view sequentially passes through the lens to be aligned, the optical film to be aligned, the phase delay element 3 and the polarizer 4, and is finally received by the detection module 5. For example, the detection module 5 may be a CCD camera.
In a specific embodiment, the optical film is a POL film or an RP film. The light source assembly generates linearly polarized light of a plurality of fields of view such that the linearly polarized light of the plurality of fields of view passes sequentially over the lens to be aligned and the POL film or the RP film to be aligned, wherein the POL film and the RP film are configured to selectively reflect and transmit the polarized light. The polarized light transmitted through the POL film or the RP film is also linearly polarized light. The POL film or RP film to be aligned is driven by the electric rotating wheel to rotate, and the emergent light passing through the POL film or RP film passes through the phase delay element and the polarizer rotating at the angular frequency omega and is finally received by the CCD.
In another specific embodiment, the optical film is a QWP film. The light source assembly generates linearly polarized light of a plurality of fields of view, such that the linearly polarized light of the plurality of fields of view is incident on the lens to be aligned and the QWP film to be aligned, wherein the QWP film is configured to convert a polarization state of the light beam. The polarized light transmitted from the QWP film may be linearly polarized light, circularly polarized light, or elliptically polarized light. The electric rotating wheel can drive the QWP film to be aligned to rotate, linearly polarized light passes through the QWP film to be aligned, and when the incident linearly polarized light is consistent with the fast axis direction of QWP, the linearly polarized light is emitted, and elliptical polarized light is emitted from other states. The outgoing light passes through a phase delay element 3 and a polarizer 4 rotated at an angular frequency ω and is finally received by the CCD.
In step 2, according to the intensity of the light emitted from the polarizer 4 received by the detection module 5, the polarization parameter of the light emitted from the optical module is obtained. The polarization parameter may be an azimuth angle of the light exiting the optical module, and/or the polarization parameter may be an ellipsometry of the light exiting the optical module. The azimuth angle of the emergent direction of the optical module is as follows: the optical module emits polarized light and an angle between the horizontal axis.
In this step, the intensity of the outgoing light of the polarizer 4 received by the detection module 5 obtains the azimuth angle of the outgoing light of the optical film based on the stokes vector and the muller matrix. Specifically, when the angle between the fast axis of the retarder 3 and the horizontal direction is α (α=ωt), the polarizer 4 emits polarized light intensities of a plurality of fields of view, and the polarization parameters of the polarized light emitted by the optical module are calculated based on stokes vectors and mueller matrices according to the polarized light intensities of the plurality of fields of view emitted by the polarizer 4 detected by the detection module 5.
In step 3, determining the optical axis angle of the optical film according to the polarization parameters of the light emitted by the optical module. Specifically, according to the polarization parameters of the emergent light of the optical film to be aligned, the optical axis angle of the optical film to be aligned is determined.
In one example, the optical module includes a lens 21 to be aligned and an optical film 22 to be aligned, and the optical film 22 to be aligned is disposed closer to the retarder 3 than the lens 21 to be aligned. The optical film to be aligned is a POL film or an RP film, the azimuth angle of polarized light emitted by the optical module is calculated based on Stokes vectors and Mueller matrixes according to the intensity of polarized light of a plurality of fields emitted by the polarizer 4 detected by the detection module 5, and the optical axis angle of the optical film to be aligned is determined according to the azimuth angle of polarized light emitted by the optical module. Specifically, regardless of the type of polarized light emitted from the light source module, the vibration direction of the light vector of the polarized light emitted from the POL film or the RP film must be identical to the transmission axis direction of the POL film or the RP film based on the principle that the POL film or the RP film has a function of transmitting and blocking polarized light in a specific direction. Therefore, the optical axis angle of the POL film or the RP film to be aligned can be determined according to the azimuth angle of the polarized light emitted by the optical module.
In one example, the optical module includes a lens 21 to be aligned and an optical film 22 to be aligned, and the optical film 22 to be aligned is disposed closer to the retarder 3 than the lens 21 to be aligned. The optical film to be aligned is a QWP film, the azimuth angle and the ellipsometry of polarized light emitted by the optical module are calculated based on Stokes vectors and Mueller matrixes according to the intensity of polarized light of a plurality of fields emitted by the polarizer 4 detected by the detection module 5, and the optical axis angle of the optical film to be aligned is determined according to the azimuth angle and the ellipsometry of the polarized light emitted by the optical module. Specifically, the polarized light exiting the QWP film may be linearly polarized light, circularly polarized light, or elliptically polarized light based on the principle that the QWP film has a function of converting the polarization state of the light beam, regardless of the type of polarized light exiting the light source assembly. When the polarized light emitted from the QWP film is linearly polarized light, the vibration direction of the light vector of the linearly polarized light must be coincident with the fast axis or slow axis direction of the QWP film. When the polarized light emitted from the QWP film is elliptically polarized light, in which the major and minor axes of the elliptically polarized light coincide with the fast and slow axes of the QWP film, the fast or slow axis angle of the QWP film is determined by calculating the ellipticity of the elliptically polarized light. When the polarized light exiting the QWP film was circularly polarized, it was shown that the QWP fast and slow axes were at 45 ° relative to the lens. Therefore, the optical axis angle of the QWP film to be aligned can be determined according to the azimuth angle and ellipsometry of the polarized light emitted by the optical module.
In step 4, the straight edge angle of the lens is obtained. The straight edge angle is an included angle between a straight edge section of the lens and a datum line, and the datum line is a coordinate axis in the vertical direction in a visual camera 6 coordinate system;
in this step, the angle between the straight edge section of the lens and the vertical coordinate axis determined by the coordinates of the vision camera 6 itself is acquired by the vision camera 6.
In a specific embodiment, a surface light source is provided, the surface light source shines on the side edge of the lens, the vision camera 6 shoots the straight edge of the lens, and the included angle between the straight edge section of the lens and the vertical coordinate axis determined by the self coordinate of the vision camera 6 is obtained. The optical axis of the specific lens is a virtual axis, and the optical axis angle of the lens to be aligned can not be directly measured through the device.
The visual camera 6 is fixedly arranged, and the lens to be aligned is fixedly arranged relative to the optical film to be aligned, so that the straight edge angle of the lens to be aligned obtained by the visual camera 6 is a fixed value.
For example, after the lens to be aligned is in the material, the lens to be aligned has a straight edge section. Specifically, the lens includes an arcuate portion and a straight segment connected to the arcuate member. Wherein the straight edge segments may be formed by cutting, for example by cutting a circular lens to form a lens having straight edge segments.
In step 5, the optical module is aligned by rotating the optical film based on the angle of the optical axis of the optical film and the angle of the straight edge of the lens.
Specifically, according to the obtained angle of the optical axis of the optical film 22 to be aligned and the obtained angle of the straight edge of the lens 21 to be aligned, the optical film to be aligned can be driven to rotate by the electric rotating wheel, and the compensation of the angle deviation is performed, so that the precise alignment of the polarizing optical axis of the optical film and the lens in the optical module is completed.
Therefore, in the embodiment of the application, the optical axis angle of the optical film is determined by calculating the polarization parameters of the emergent light of the optical module, the straight edge angle of the lens is obtained by the vision camera, and the optical axis angle of the optical film and the straight edge angle of the lens are aligned by rotating the optical film, so that the precise alignment of the optical film and the lens in the optical module is realized.
In an alternative embodiment, the phase delay element rotated at angular frequency ω in combination with the polarizer and the CCD may be replaced by an expensive polarization camera if only linearly polarized light is measured. In an alternative embodiment, the CCD may be replaced by CMOS.
In one example, the phase delay element is a quarter wave plate and the polarizer is a horizontal linear polarizer.
In this embodiment, the types of the phase delay element 3 and the polarizer 4 are defined, wherein the mueller matrix of the quarter-wave plate and the horizontal linear polarizer is simpler, so that the difficulty of acquiring the polarization parameters of the light rays emitted by the optical module can be reduced.
In one example, the light source assembly includes a polarizer 14, and in the case that the optical film is a phase retardation film, before controlling polarized light of multiple fields of view to pass through the optical module to be aligned, the method further includes: the angle of the polarizer 4 is controlled to be the ideal optical axis angle of the phase delay film to be measured.
Specifically, the angle of the polarizer 14 is controlled to be the ideal optical axis angle of the retarder to be measured, when the angle of the polarizer 14 and the optical axis angle of the retarder coincide, the polarized light emitted from the retarder is linearly polarized light, and when the angle of the polarizer and the optical axis angle of the retarder are set to be offset, the polarized light emitted from the retarder is elliptically polarized light or circularly polarized light. Therefore, in order to ensure that the polarized light emitted from the phase delay film is linearly polarized, the angle of the polarizer is controlled to be the ideal optical axis angle of the phase delay film to be measured. When the detected angle of the optical axis of the phase retarder film coincides with the angle of the polarizer, polarized light is emitted from the phase retarder film as linearly polarized light.
In one example, according to the intensity of the light emitted from the polarizer 4 received by the detection module 5, the obtaining the polarization parameter of the light emitted from the optical module to be aligned 2 specifically includes the following steps:
step 01: when the included angle between the fast axis of the phase delay element 3 and the horizontal direction is alpha, the intensity of the light emitted by the polarizer 4 is obtained, wherein alpha=ωt, and t is the rotation time of the phase delay element;
step 02: according to the intensity of the light emitted by the polarizer 4, obtaining a Stokes vector of the light emitted by the optical module 2 to be aligned;
step 03: and obtaining the polarization parameters of the light rays emitted by the optical module 2 to be aligned according to the Stokes vector of the light rays emitted by the optical module 2 to be aligned.
In step 01, the intensity of the light emitted from the polarizer 4 is obtained when the fast axis of the retarder 3 forms an angle α with the horizontal direction, where α=ωt. Specifically, polarized light of a plurality of fields of view exiting from the polarizer 4 is finally received by the detection module 5. After the detection module 5 receives polarized light of a plurality of fields of view emitted from the polarizer 4, the light intensity of the polarized light of a plurality of fields of view emitted from the polarizer 4 can be detected by the detection module 5. Since the retarder 3 rotates at the angular frequency ω, the detecting module 5 can detect the intensities of the polarized light rays of the multiple fields of view emitted by the polarizer 4 when the angle α between the fast axis of the retarder 3 and the horizontal direction is detected in real time.
In step 02, when the detection module 5 detects that the angle between the fast axis of the retarder 3 and the horizontal direction is α, the stokes vector of the light emitted from the optical module can be obtained according to the intensities of the polarized light of the multiple fields emitted from the polarizer 4 under the condition that the polarized light of the multiple fields emitted from the polarizer 4. The stokes vector of the light emitted by the optical module can represent the polarization state and the intensity of the light beam.
For example, the Stokes vector of the light emitted by the optical module (i.e. the light emitted by the optical film in the optical module) is S m 。
Wherein S is 0 Representing the total light intensity, S 1 Representing the light intensity difference between the horizontally linearly polarized light and the vertically linearly polarized light; s is S 2 Representing the light intensity difference between 45-degree linearly polarized light and-45-degree linearly polarized light; s is S 3 Indicating the light intensity difference between right circularly polarized light and left circularly polarized light.
Wherein S is 0 、S 1 、S 2 And S is 3 Are each represented by the intensity of polarized light of a plurality of fields of view that can be emitted by the polarizer 4.
In step 03, a Stokes vector S of the outgoing light of the optical module is calculated m The polarization parameters of the outgoing light of the optical module can be obtained.
For example, the polarization parameters of the light exiting the optical module include ellipsometry of the light exiting the optical module and azimuth angle of the light exiting the optical module.
For example, the azimuth angle psi of the outgoing light of the optical module can be obtained by the formula (2);
the ellipsometry χ of the outgoing light of the optical module can be obtained by the formula (3):
therefore, in the embodiment of the present application, according to the intensities of the light rays of multiple fields of view emitted by the polarizer 4 when the angle between the fast axis of the phase delay element 3 and the horizontal direction obtained by the detection module is α, each element (S) in the formula (1) is calculated 0 、S 1 、S 2 And S is 3 ) Wherein each element (S 0 、S 1 、S 2 And S is 3 ) Is also related to the included angle between the fast axis of the phase delay element 3 and the horizontal direction; then, the optical module is calculated according to the formula (2) and the formula (3) respectively in the numerical value of each element calculated according to the formula (1)The azimuth angles of the emergent rays (polarized light of a plurality of fields of view) and the azimuth angles of the emergent rays of the optical module are calculated.
According to the alignment method for the polarization parameters of the optical module, the outgoing light rays of the VR Pancake optical module are detected in a combined mode that the phase delay element 3 rotating at the angular frequency omega is combined with the polarizer 4 and the detection module 5.
When the optical film 22 to be aligned is a POL film or an RP film, the optical axis angle of the optical film to be aligned in the optical module is determined by the calculated azimuth angle of the light emitted from the optical module.
When the optical film to be aligned is a QWP film, determining the optical axis angle of the optical film to be aligned in the optical module through the calculated azimuth angle and ellipsometry of the emergent light of the optical module.
In one example, according to the intensity of the light emitted by the polarizer 4, the obtaining the stokes vector of the light emitted by the optical module to be aligned 2 specifically includes the following steps:
step 001: acquiring a relation model existing between the intensity of the light emitted by the polarizer 4 and the Stokes vector of the light emitted by the optical module to be aligned;
step 002: performing Fourier transform on the relation model, and acquiring the Fourier transform coefficient according to the intensity of the emergent light of the polarizer 4;
step 003: and acquiring a Stokes vector of the light rays emitted by the optical module 2 to be aligned according to the Fourier transform coefficient.
In step S001, the intensity of the light emitted from the polarizer 4 is related to the stokes vector of the light emitted from the optical module 2 to be aligned and the rotation angle α of the retarder 3. For example, the rotation angle of the retarder 3 is the angle between the fast axis of the retarder 3 and the horizontal direction; the angle between the fast axis of the phase delay element 3 and the horizontal direction is α, α=ωt.
For example, in the case where the retarder 3 is a quarter-wave plate and the polarizer 4 is a horizontal linear polarizer, the expression of the relationship between the intensity of the light emitted from the polarizer 4 and the stokes vector of the light emitted from the optical module 2 to be aligned is:
wherein in the formula (4), alpha is the included angle between the fast axis of the phase delay element 3 and the horizontal direction, S 0 、S 1 、S 2 And S is 3 Are elements in the Stokes vector matrix of the emergent rays of the optical module.
In step S002, the fourier transform is performed on equation (4), and a fourier transform coefficient is obtained from the intensity of the light emitted from the polarizer 4. Specifically, by fourier transform, a relationship between the fourier transform coefficient and the intensity of the detected polarizer-exiting light can be obtained.
For example, formula (4) is written as a fourier series form, where the fourier series form corresponding to formula (4) is formula (5):
then, in the fourier transform of the formula (5), the relation between the fourier transform coefficients A, B, C and D and the intensity of the detected light emitted from the polarizer 4 can be obtained. Equation (6) below shows the relationship between the fourier transform coefficient a and the intensity of the detected polarizer exit light, equation (7) shows the relationship between the fourier transform coefficient B and the intensity of the detected polarizer exit light, equation (8) shows the relationship between the fourier transform coefficient C and the intensity of the detected polarizer exit light, and equation (9) shows the relationship between the fourier transform coefficient D and the intensity of the detected polarizer exit light. Wherein the method comprises the steps of
In step S003, a stokes vector of the light emitted from the optical module is obtained according to the fourier transform coefficient. Specifically, according to the above formulas (6) - (9), parameters in a stokes vector matrix of the outgoing light of the optical module are obtained.
Specifically, from the formula (4) and the formula (5), it can be known that:
B＝S 3 (11)
from the formula (10) -formula (13), it can be known that:
S 0 ＝A-C (14)
S 1 ＝2C (15)
S 2 ＝2D (16)
S 3 ＝B (17)
therefore, according to the formulas (6) - (9) and (14) - (17), parameters in the stokes vector matrix of the outgoing light of the optical module can be obtained, so that the stokes vector of the outgoing light of the optical module can be obtained. According to Stokes vector of the outgoing light of the optical module, and by combining the formulas (2) - (3), respectively calculating azimuth angles and ellipsoids of the outgoing light (polarized light of a plurality of fields of view) of the optical module.
In one example, the obtaining a model of the relationship between the intensity of the light emitted by the polarizer 4 and the stokes vector of the light emitted by the optical module to be aligned 2 specifically includes the following steps:
step 0001: setting the Stokes vector of the emergent ray of the optical module as Sm;
step 0002: according to the Stokes vector Sm, a Stokes vector S' of the light emitted by the phase delay element 3 is obtained;
Step 0003: according to the Stokes vector S', a Stokes vector Sout of the light emitted by the polarizer 4 is obtained;
step 0004: and obtaining a relation model existing between the intensity of the light emitted by the polarizer 4 and the Stokes vector of the light emitted by the optical module 2 to be aligned according to the Stokes vector Sout.
Specifically, in step 0001, the stokes vector of the light emitted from the optical module is set to S m . Specifically, the Stokes vector of the light emitted from the optical film of the optical module is set as S m 。
For example, let the stokes vector of the outgoing light of the optical film in the optical module to be aligned be:
wherein S is 0 Representing the total light intensity, S 1 Representing the light intensity difference between the horizontally linearly polarized light and the vertically linearly polarized light; s is S 1 Representing the light intensity difference between 45-degree linearly polarized light and-45-degree linearly polarized light; s is S 3 Indicating the light intensity difference between right circularly polarized light and left circularly polarized light.
In step 0002, according to Stokes vector S m The stokes vector S' of the light emitted from the phase delay element 3 is obtained, specifically, the stokes vector S of the light emitted from a certain componentThe stokes vector is the product of the mueller matrix of the component and the stokes vector of the emergent light of the upper component.
For example according to the Stokes vector S m And the mueller matrix of the phase delay element 3 with the angle alpha between the fast axis and the horizontal direction, to obtain the stokes vector S' of the light emitted by the phase delay element 3.
In a specific embodiment, the phase delay element 3 is a quarter-wave plate, and the muller matrix of the quarter-wave plate with the fast axis having an angle α with respect to the horizontal direction can be expressed as:
the quarter wave plate rotates at an angular velocity ω (α=ωt).
After the light emitted by the alignment optical module 2 passes through the rotated quarter wave plate, the stokes vector of the light is as follows:
the following are to be described: the phase delay element 3 may also be a half-wave plate, which allows the light emitted from the optical module to pass through, and the stokes vector of the light emitted from the optical module after passing through the rotated half-wave plate is the product of the mueller matrix of the half-wave plate and the stokes vector of the light emitted from the optical module.
In step 0003, the stokes vector S of the light emitted from the polarizer 4 is obtained from the stokes vector S out The method comprises the steps of carrying out a first treatment on the surface of the Specifically, the stokes vector of the emergent ray of a certain component is the product of the mueller matrix of the component and the stokes vector of the emergent ray of the upper component.
The stokes vector S of the light exiting the polarizer 4 is derived, for example, from the stokes vector S' and the mueller matrix of the polarizer 4 out 。
In a specific embodiment, polarizer 4 is a horizontally linear polarizer. The muller matrix of the horizontal linear polarizer (i.e., the muller matrix of the light transmission axis of the horizontal linear polarizer in the horizontal direction) is expressed as:
the relationship between the outgoing light passing through the horizontal linear polaroid and the outgoing light of the optical module 2 to be aligned is as follows:
S out ＝NMS VR (21)
the light exiting through the horizontal linear polarizer is expressed as stokes vector of the light exiting through the horizontal linear polarizer is expressed as:
the polarizer 4 may be a circular polarizer. According to the principles set forth above, the Stokes vector of light rays exiting through the circular polarizer can be obtained.
In step 0004, according to Stokes vector S out And acquiring a relational expression existing between the intensity of the light emitted by the polarizer 4 and the Stokes vector of the light emitted by the optical module 2 to be aligned.
Specifically, only the outgoing light S is calculated out The first component of (a) i.e. the total intensity can be detected, S' 0 ＝I(α)
Thus, the above formula (4) shows the relationship between the intensity of the light emitted from the polarizer 4 and the Stokes vector of the light emitted from the optical module 2 to be aligned, where in the formula (4), α is the angle between the fast axis of the retarder 3 and the horizontal direction, S 0 、S 1 、S 2 And S is 3 Are elements in the Stokes vector matrix of the emergent rays of the optical module. Then to the maleAnd (4) performing Fourier transform, and acquiring Fourier transform coefficients according to the intensity of the light emitted by the polarizer 4. Specifically, by fourier transform, a relationship between the fourier transform coefficient and the intensity of the detected polarizer-exiting light can be obtained. Then, the relation between the fourier transform coefficients A, B, C and D and the intensity of the detected light emitted from the polarizer 4 can be obtained by fourier transform on the above formula (5). For example, equation (6) above shows the relationship between the fourier transform coefficient a and the intensity of the detected polarizer exit light, equation (7) shows the relationship between the fourier transform coefficient B and the intensity of the detected polarizer exit light, equation (8) shows the relationship between the fourier transform coefficient C and the intensity of the detected polarizer exit light, and equation (9) shows the relationship between the fourier transform coefficient D and the intensity of the detected polarizer exit light.
Therefore, according to the above formulas (6) - (9) and the above formulas (14) - (17), parameters in the stokes vector matrix of the outgoing light of the optical module can be obtained, so as to obtain the stokes vector of the outgoing light of the optical module. According to the Stokes vector of the outgoing light of the optical module, the azimuth angle and the ellipsometry of the outgoing light (polarized light of a plurality of fields of view) of the optical module are calculated respectively by combining the above formulas (2) - (3). And finally, determining the optical axis angle of the optical film in the optical module according to the azimuth angle and the ellipsometry of the emergent light of the optical module to be aligned.
In one example, the phase delay element rotating at an angular frequency ω specifically includes:
the phase delay element is driven to rotate at an angular frequency ω by a stepper motor having steps n, steps aj, α=ωt=n×aj.
In a specific embodiment, the phase delay element 3 is driven in rotation by a stepper motor. The quarter wave plate is driven in rotation, for example by a stepper motor.
Specifically, the quarter wave plate is placed on a fixed base, and can be driven to rotate through a stepping motor in n steps: ωt=nα j (α j Step length, N is totalNumber of steps). Wherein according to α=ωt=nα j The equation (23) can be obtained by converting the equation (5).
Wherein the relationship between the fourier transform coefficients A, B, C and D and the intensity of the detected light exiting the polarizer 4 can be obtained by fourier transform, wherein equations (24) - (27) show the relationship between the fourier transform coefficients A, B, C and D and the intensity of the detected light exiting the polarizer 4.
Thus, in the embodiment of the present application, given the step size and the step number of the stepper motor and the intensity of the detected light emitted from the polarizer 4, the stokes vector of the light emitted from the optical module can be obtained. And then obtaining the polarization parameters of the optical module according to the Stokes vector of the emergent light of the optical module, and determining the optical axis angle of the optical film in the optical module according to the polarization parameters of the optical module.
In a second aspect, an embodiment of the present application provides an optical module alignment system, where the alignment system includes:
a light source assembly 1, a phase delay element 3, a polarizer 4 and a detection module 5, the phase delay element 3 rotating at an angular frequency ω; the optical module 2 to be aligned is arranged between the light source component 1 and the phase delay element 3, the optical module 2 to be aligned comprises a lens to be aligned and an optical film to be aligned, and the optical film 22 to be aligned rotates relative to the lens 21 to be aligned;
the light source assembly 1 is used for emitting polarized light of a plurality of fields of view;
when the optical module to be aligned 2 is placed between the light source assembly 1 and the retarder 3, the optical module to be aligned 2, the retarder 3, the polarizer 4 and the detection module 5 are sequentially arranged along the same optical axis, and the vision camera 6 is located above the lens to be aligned 21.
In the embodiment of the present application, the light source assembly 1 emits polarized light of a plurality of fields of view. For example, the light source assembly 1 emits linearly polarized light of a plurality of fields of view, so that the linearly polarized light of a plurality of fields of view is incident on the optical module to be aligned, and the light emitted from the optical module passes through the phase delay element 3 rotated at the angular frequency ω, and the polarizer 4, and is finally received by the detection module 5. By the method, the Stokes vector of the emergent light of the optical module to be aligned can be detected, so that the ellipsometry and the azimuth angle of the optical module to be aligned can be calculated, and the optical axis angle of the optical film in the optical module to be aligned can be obtained according to the calculated polarization parameters of the optical module to be aligned. And the vision camera can be fixed above the lens 21 to be aligned, and the straight-edge angle of the lens 21 to be aligned is obtained.
In one example, the light source assembly includes: a light source, a quick reflector, a lens group and a polarizer, wherein the lens group comprises at least one lens;
light rays emitted by the light source are projected to the optical module to be tested through the quick reflector, the lens group and the polarizer in sequence.
Specifically, the lens group includes a first lens 12 and a second lens 13, the light emitted from the light source passes through the quick reflector 11, the first lens 12 and the second lens 13, and F1 and F2 are focal lengths of the first lens 12 and the second lens 13, respectively, and then passes through the polarizer 14 to generate linearly polarized light with multiple fields of view. Wherein the light source is a laser.
In one example, a stepper motor is also included that drives the phase delay element to rotate at an angular frequency ω.
In the embodiment of the present application, the phase delay element 3 is driven by a stepping motor, wherein the stokes vector of the outgoing light of the optical module can be obtained given the step size and the step number of the stepping motor and the intensity of the detected outgoing light of the polarizer 4. And then, acquiring the polarization parameters of the emergent light of the optical module according to the Stokes vector of the emergent light of the optical module, and acquiring the optical axis angle of the optical film in the optical module according to the polarization parameters of the emergent light of the optical module.
In one example, the polarizer is a horizontal linear polarizer and the phase retarding element is a quarter wave plate.
In this embodiment, the types of the phase delay element 3 and the polarizer 4 are limited, the mueller matrix of the quarter-wave plate and the horizontal linear polarizer is simple, and the stokes vector difficulty of acquiring the light rays emitted by the optical module can be reduced.
The specific implementation of the optical film alignment system according to the embodiment of the present application may refer to each embodiment of the optical module alignment method, so at least the optical film alignment system has all the advantages brought by the technical solutions of the embodiments, which are not described herein in detail.
The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (16)
1. The optical module alignment method is applied to an optical module alignment system, and the alignment system comprises: the device comprises a light source assembly, a phase delay element, a polarizer and a detection module, wherein the phase delay element rotates at angular frequency omega, and an optical module to be aligned is arranged between the light source assembly and the phase delay element; the optical module to be aligned comprises a lens to be aligned and an optical film to be aligned, and the optical film to be aligned can rotate relative to the lens to be aligned; the alignment system further comprises a vision camera under the condition that the optical module to be aligned is arranged between the light source assembly and the phase delay element;
the optical module alignment method comprises the following steps:
polarized light of a plurality of view fields is controlled to sequentially pass through the optical module to be aligned, the phase delay element and the polarizer and then projected to the detection module;
according to the intensity of the outgoing light of the polarizer received by the detection module, obtaining the polarization parameter of the outgoing light of the optical module to be aligned;
determining the optical axis angle of the optical film to be aligned according to the polarization parameters;
acquiring a straight edge angle of the lens to be aligned, wherein the straight edge angle is an included angle between a straight edge of the lens and a reference line, and the reference line is a coordinate axis in a vertical direction in a visual camera coordinate system;
And rotating the optical film to be aligned based on the polarization parameter and the straight edge angle to realize the alignment of the optical module.
2. The alignment method according to claim 1, wherein the optical film is one of a polarizing film, a reflective polarizing film, or a phase retardation film.
3. The alignment method according to claim 2, wherein, when the optical film to be aligned is a phase retardation film, the polarization parameters of the light emitted from the optical module to be aligned are azimuth angle and ellipsometry according to the intensity of the light emitted from the polarizer received by the detection module.
4. The alignment method according to claim 2, wherein, when the optical film to be aligned is a polarizing film or a reflective polarizing film, the polarization parameter of the light exiting the optical module to be aligned is obtained as an azimuth angle according to the intensity of the light exiting the polarizer received by the detection module.
5. The alignment method of claim 1 wherein the phase retardation element is a quarter wave plate and the polarizer is a horizontal linear polarizer.
6. The alignment method according to claim 1, wherein the light source assembly includes a polarizer, and wherein controlling polarized light of a plurality of fields of view before passing through the optical module to be aligned in a case where the optical film to be aligned is a phase retardation film further includes:
And controlling the angle of the polarizer to be the ideal optical axis angle of the phase delay film to be measured.
7. The alignment method according to claim 1, wherein obtaining the polarization parameter of the light exiting the optical module to be aligned according to the intensity of the light exiting the polarizer received by the detection module specifically includes:
when the included angle between the fast axis of the phase delay element and the horizontal direction is alpha, the intensity of the outgoing light of the polarizer is obtained, wherein alpha=ωt, and t is the rotation time of the phase delay element;
according to the intensity of the outgoing light of the polarizer, obtaining a Stokes vector of the outgoing light of the optical module to be aligned;
and obtaining the polarization parameters of the outgoing light of the optical module to be aligned according to the Stokes vector of the outgoing light of the optical film to be aligned.
8. The alignment method according to claim 7, wherein obtaining the stokes vector of the outgoing light of the optical module to be aligned according to the intensity of the outgoing light of the polarizer specifically comprises:
acquiring a relation model existing between the intensity of the outgoing light of the polarizer and the Stokes vector of the outgoing light of the optical module to be aligned;
Performing Fourier transform on the relation model, and acquiring the Fourier transform coefficient according to the intensity of the emergent light of the polarizer;
and acquiring a Stokes vector of the emergent light of the optical module to be aligned according to the Fourier transform coefficient.
9. The alignment method according to claim 8, wherein obtaining a model of a relationship existing between the intensity of the polarizer outgoing light and the stokes vector of the optical film outgoing light to be aligned specifically comprises:
setting the Stokes vector of the outgoing light of the optical module to be aligned as Sm;
obtaining Stokes vector S of the light emitted by the phase delay element according to the Stokes vector Sm ′ ；
According to the Stokes vector S ′ Acquiring a Stokes vector Sout of the light rays emitted by the polarizer;
and obtaining a relation model existing between the intensity of the light emitted by the polarizer and the Stokes vector of the light emitted by the optical module to be aligned according to the Stokes vector Sout.
10. The alignment method according to claim 9, characterized in that according to the stokes vector S m Acquiring Stokes vector S of light emitted by the phase delay element ′ The method specifically comprises the following steps:
according to the Stokes vector S m And the Mueller matrix of the phase delay element with the angle alpha between the fast axis and the horizontal direction to obtain emergent rays of the phase delay elementStokes vector S of (2) ′ 。
11. The alignment method according to claim 9, characterized in that according to the stokes vector S ′ The obtaining the stokes vector Sout of the outgoing light ray of the polarizer specifically includes:
according to the Stokes vector S ′ And the Mueller matrix of the polarizer, obtaining the Stokes vector Sout of the outgoing light of the polarizer.
12. The alignment method according to claim 1, wherein the phase delay element rotates at an angular frequency ω comprises:
the phase delay element is driven to rotate at an angular frequency ω by a stepper motor having steps n, steps aj, α=ωt=n×aj.
13. An optical module alignment system, the alignment system comprising:
the device comprises a light source assembly, a phase delay element, a polarizer and a detection module, wherein the phase delay element rotates at an angular frequency omega; the optical module to be aligned comprises a lens to be aligned and an optical film to be aligned, and the optical film to be aligned rotates relative to the lens to be aligned;
The light source component is used for emitting polarized light of a plurality of view fields;
when the optical module to be aligned is placed between the light source assembly and the phase delay element, the optical module to be aligned, the phase delay element, the polarizer and the detection module are sequentially arranged along the same optical axis, and the vision camera is located above the lens to be aligned.
14. The alignment system of claim 13, wherein the light source assembly comprises: a light source, a quick reflector, a lens group and a polarizer, wherein the lens group comprises at least one lens;
light rays emitted by the light source are projected to the optical module to be tested through the quick reflector, the lens group and the polarizer in sequence.
15. The alignment system of claim 13 further comprising a stepper motor that drives the phase delay element to rotate at an angular frequency ω.
16. The alignment system of claim 13 wherein the polarizer is a horizontal linear polarizer and the phase retardation element is a quarter wave plate.
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