CN218767621U

CN218767621U - Optical assembly and testing device comprising same

Info

Publication number: CN218767621U
Application number: CN202223581184.4U
Authority: CN
Inventors: 杨乐宝; 金贤敏
Original assignee: Wuxi Photonic Chip Joint Research Center
Current assignee: Wuxi Photonic Chip Joint Research Center
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-03-28
Anticipated expiration: 2032-12-30

Abstract

The embodiment of the application relates to an optical assembly and a testing device comprising the same. An optical assembly according to some embodiments of the present application includes: a prism waveguide including a plurality of prisms, adjacent ones of the plurality of prisms being attached at a prism interface, a first prism interface being located at a middle position of the prism waveguide, a second prism interface being located at both ends of the prism waveguide and being substantially symmetrical about the middle position of the prism waveguide, the second prism interface located at one of the both ends of the prism waveguide being substantially parallel to the first prism interface; and the 1/4 wave plate is positioned below the first prism interface and matched with the first prism interface so as to reflect light which enters the middle position of the prism waveguide from two ends of the prism waveguide into the prism waveguide as output light which is output outside the prism waveguide. The optical assembly and the testing device comprising the same provided by the embodiment of the application can effectively solve the problems encountered in the traditional technology.

Description

Optical assembly and testing device comprising same

Technical Field

Embodiments of the present application relate generally to optical waveguides, and more particularly, to optical assemblies and test devices incorporating the same.

Background

General virtual reality device or augmented reality device VR/AR's binocular test and calibration, are carried out the calibration by two measuring equipment respectively, but have the following problem:

1. because two measuring devices are adopted, the system errors of the two measuring devices are inconsistent, so that the binocular test is problematic; and

2. the binocular calibration problem needs to be carried out on light in the same direction in a binocular system, however, due to the fact that two measuring devices are adopted, the binocular parallax calibration of the two measuring devices is problematic (binocular parallax exists in the two measuring devices), the two measuring devices can cause position or angle deviation along with a series of reasons such as transportation, time and fixed tightness, and finally the testing is inaccurate.

Therefore, the present application provides an optical assembly and a testing apparatus including the same.

SUMMERY OF THE UTILITY MODEL

An objective of the embodiments of the present invention is to provide an optical device and a testing apparatus including the same, which are tested by using only one testing apparatus and have more accurate testing results compared to the conventional method.

An embodiment of the present application provides an optical assembly, which includes: the prism waveguide comprises a plurality of prisms, the adjacent prisms in the prisms are attached at prism interfaces, the first prism interface is positioned in the middle of the prism waveguide, the second prism interface is positioned at two ends of the prism waveguide and is approximately symmetrical about the middle of the prism waveguide, and the second prism interface positioned at one end of the two ends of the prism waveguide is approximately parallel to the first prism interface; and the 1/4 wave plate is positioned below the first prism interface and matched with the first prism interface so as to reflect the light which enters the middle position of the prism waveguide from the two ends of the prism waveguide into the output light outside the output prism waveguide.

According to some embodiments of the present application, the third prism interface is located at both ends of the prism waveguide, and the second prism interface and the third prism interface located at the same end of the prism waveguide are substantially parallel.

According to some embodiments of the present application, the prism interface includes an angle between 20 degrees and 70 degrees with respect to the adjacent base surface of the respective prism.

Some embodiments of the present application also provide a test device, comprising: an optical assembly according to the foregoing; and a detector for receiving the output light and producing a detection result.

Compared with the prior art, the optical assembly and the testing device comprising the same have the advantages that binocular testing is conducted through one set of system in a unified mode, and binocular calibration can be conducted only through one set of measuring equipment.

Drawings

Drawings necessary for describing embodiments of the present application or the prior art will be briefly described below in order to describe the embodiments of the present application. It is to be understood that the drawings in the following description are only some of the embodiments of the present application. It will be apparent to those skilled in the art that other embodiments of the drawings can be obtained from the structures illustrated in these drawings without the need for inventive work.

Fig. 1 is a schematic diagram of an optical assembly 100 according to some embodiments of the present application.

FIG. 2 is a schematic diagram of a testing device according to some embodiments of the present application.

FIG. 3 is a schematic diagram of a testing method according to some embodiments of the present application.

FIG. 4 is a schematic diagram of a calibration method according to some embodiments of the present application.

Detailed Description

In order to better understand the spirit of the embodiments of the present application, the following further description is given in conjunction with some preferred embodiments of the present application.

Embodiments of the present application will be described in detail below. Throughout the specification, the same or similar components and components having the same or similar functions are denoted by like reference numerals. The embodiments described herein with respect to the figures are illustrative in nature, are diagrammatic in nature, and are used to provide a basic understanding of the present application. The embodiments of the present application should not be construed as limiting the present application.

As used herein, the terms "substantially", "substantially" and "about" are used to describe and illustrate minor variations. When used in conjunction with an event or circumstance, the terms can refer to instances where the event or circumstance occurs precisely as well as instances where the event or circumstance occurs in close proximity. For example, when used in conjunction with numerical values, the term can refer to a range of variation that is less than or equal to ± 10% of the stated numerical value, such as less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%. For example, two numerical values are considered to be "substantially" the same if the difference between the two numerical values is less than or equal to ± 10% (e.g., less than or equal to ± 5%, less than or equal to ± 4%, less than or equal to ± 3%, less than or equal to ± 2%, less than or equal to ± 1%, less than or equal to ± 0.5%, less than or equal to ± 0.1%, or less than or equal to ± 0.05%) of the mean of the values.

In this specification, unless specified or limited otherwise, relative terms such as: the terms "vertical," "lateral," "upper," "lower," and derivatives thereof (e.g., "upper surface," etc.) should be construed to refer to the orientation as then described in the discussion or as shown in the drawings. These relative terms are for convenience of description only and do not require that the present application be constructed or operated in a particular orientation.

Additionally, amounts, ratios, and other numerical values are sometimes presented herein in a range format. It is to be understood that such range format is used for convenience and brevity, and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited.

For convenience of description, "first," "second," and the like may be used herein to distinguish one element or series of elements from another. "first," "second," and the like are not intended to describe corresponding components or operations.

As shown in fig. 1, the optical assembly 100 includes a prism waveguide 180, the prism waveguide 180 includes a plurality of prisms, adjacent prisms of the plurality of prisms are attached at a prism interface, a first prism interface 103 is located at a middle position of the prism waveguide 180, a second prism interface 101 is located at both ends (a first end 110 and a second end 120) of the prism waveguide and is substantially symmetrical with respect to the middle position of the prism waveguide, and the second prism interface 101 located at one end (the first end 110) of the both ends of the prism waveguide is substantially parallel to the first prism interface 103; and a 1/4 wave plate 104 positioned below the first prism interface 103, the 1/4 wave plate 104 cooperating with the first prism interface 103 to reflect light incident into an intermediate position from both ends of the prism waveguide as output light (first output light 30 and second output light 31) out of the output prism waveguide 108.

Because the prism is copied by the mold at present, the processing precision is very high, and the angle of the prism can be accurately controlled to obtain the required reflected light. The prisms are only needed to be jointed for connection, the alignment error is very low, for example, jointing can be carried out by a bonding mode, so that dislocation is avoided during transportation or use, the accuracy continuity is better, and the prism unit can be manufactured by directly assembling and bonding under low accuracy. Thus, the assembly tolerances of the optical components themselves ensure that the requirements for optical transmission are met.

The optical assembly provided by the application is designed according to the binocular symmetry characteristics of people, for example, parameters such as binocular pupil distance and view angle, the second prism interfaces at two ends of the prism waveguide are approximately symmetrical about the middle position of the prism waveguide, and the second prism interface at one end of the two ends of the prism waveguide is approximately parallel to the first prism interface, so that the optical path lengths of incident light at the two ends of the prism waveguide are consistent, and the middle position of the prism waveguide slightly deviates from the center of the prism waveguide.

The characteristics of the incident light entering the two ends of the prism waveguide 180 can be further analyzed by detecting the output light of the optical assembly 100, so that the device under test generating the incident light can be tested, analyzed or calibrated.

As shown in fig. 1, the first prism 150 and the second prism 160 are attached to the first prism interface 103, light (the first incident light 20 and the second incident light 21) incident from both ends of the prism waveguide 180 is changed into the first reflected light 10 and the second reflected light 11 through the first end 110 and the second end 120 of the prism waveguide 180, respectively, and the first reflected light 10 and the second reflected light 11 are reflected out of the prism waveguide 180 through the first prism interface and the 1/4 wave plate 104 located therebelow.

The interface coating of the second prism 160 and the 1/4 wave plate 104 is a total transmission coating, and the lower surface of the 1/4 wave plate 104 is a total reflection coating.

The left side of the first prism interface 103 may be coated with a film that polarizes light, transmits P-state polarized light, and reflects S-state polarized light.

The first incident light 20 passes through the prism at the first end 110 of the prism waveguide and is combined into the first reflected light 10, and the first reflected light 10 is reflected by the first prism interface 103 to form the first output light 30.

The second incident light 21 passes through the second end 120 of the prism waveguide and then is converged into second reflected light 11, the second reflected light 11 is reflected by the first prism interface 103 into third reflected light 13, the third reflected light 13 is transmitted by the upper surface of the 1/4 wave plate 104 and reflected by the lower surface of the 1/4 wave plate 104 into fourth reflected light 14, and the fourth reflected light passes through the first prism interface 103 again and is directly transmitted as second output light 31.

Only one prism interface (3 second prism interfaces 101 in fig. 1) may be provided at either of the two ends of the prism waveguide 180, but it is not limited thereto, and for example, 1 to 8 second prism interfaces 101 may be provided at either of the two ends of the prism waveguide 180. If 5 second prism interfaces 101 are provided at the first end 110 of the two ends of the prism waveguide 180, the inverse transmittance ratios of the second prism interfaces 101 along the light transmission direction (the direction of the first reflected light 10) are, in turn, respectively: 0; 50; 66; 75, a step of; 80:20. Likewise, the second end 120 of the two ends of the prism waveguide 180 may be so disposed.

Other embodiments of the present application further provide a testing apparatus, which includes the aforementioned optical assembly; and a detector for receiving the output light and producing a detection result.

As shown in fig. 2, the detector 200 is configured to receive the output light and generate a detection result. The detector 200 may be an image detection device.

For virtual reality devices or augmented reality devices (VR/AR), binocular calibration is a difficult task. Because human eyes are very sensitive to angles, and the existing equipment measures the left eye or the right eye independently, the measurement error cannot be mastered and depends on the self reference of the equipment.

Use the testing arrangement that this application provided to carry out binocular calibration and test, the measuring accuracy is higher.

As shown in FIG. 3, the VR/AR includes a left eye 302 and a right eye 301 that are worn in front of the eyes of a human eye, respectively. By arranging two ends of the optical assembly 100, i.e. two ends (the first end 110 and the second end 120) of the prism waveguide 180 in parallel (with a certain angle offset), respectively, to the right eye 301 and the left eye 302, light emitted by the VR/AR right eye 301 and the VR/AR left eye 302, respectively, is transmitted to the detector 200 through light paths at two ends of the prism waveguide 180 for detection, and finally, a detection result is given. According to the detection result, the deviation of the VR/AR can be calibrated, and when the deviation is too large, the binocular calibration of the VR/AR needs to be carried out until the deviation is within the range. And according to the deviation, the light angles emitted by the images with the same angle are consistent by adjusting the size and distance of the micro display panel of the VR/AR or calibrating the pixel image position of the micro display.

Taking the test of the VR/AR left eye 302 as an example: when the left eye optical system of the device under test VR/AR is turned on, the emitted light (e.g., the second incident light 21) is received by the prism at the second end 120 of the prism waveguide 180, and passes through one or more second prism interfaces 101 at the second end 120 to become the second reflected light 11, which is incident to the middle of the prism waveguide 180. The second reflected light 11 is reflected by the first prism interface 103 to be third reflected light 13, transmitted by the upper surface of the 1/4 wave plate 104 of the device and reflected by the lower surface of the 1/4 wave plate 104 to be fourth reflected light 14, passes through the first prism interface 103 again, is directly transmitted as second output light 31, and then enters the detector 200.

The light emitting aperture of the optical system of the left eye 302 may be smaller than the aperture of the prism at the second end 120 of the prism waveguide because the optical assembly of the present application needs to be compatible with different types of VR/ARs.

Therefore, the test device can be used for carrying out optical path test on the device to be tested so that the device to be tested meets the requirements.

Because the optical assembly that this application provided can two mesh light transmissions simultaneously, can measure two mesh parameters in the two mesh devices simultaneously, survey and calibrate testing arrangement to the device under test. The testing device provided by the application only uses one detector, so that the accuracy of binocular calibration devices is only required to be guaranteed, and the system error caused by the position error of binocular detection equipment can be reduced to the maximum extent, so that the testing accuracy is improved.

However, as a test apparatus, it is necessary to satisfy certain standards by itself so as to achieve higher test accuracy. Therefore, the test device can be used as a test standard device, and the accuracy of the test device is ensured by calibrating the test standard device before use.

Other embodiments of the present application further provide a testing method for calibrating a testing apparatus, the method comprising: the parallel light generator was tested using the test apparatus described above.

The calibration method comprises the following steps:

a more accurate parallel light generator 400 is tested using the optical assembly 100 and the probe 200.

As shown in FIG. 4, the parallel light generator 400 can emit parallel light, such as a collimator with a large aperture, and the light exit aperture of the parallel light generator 400 needs to cover the size of the optical assembly 100. The light blocking plate 402 is used to block output light from both left and right sides of the parallel light generator 400.

The specific calibration process is as follows:

step 1. The optical assembly 100, the detector 200, and the parallel light generator 400 are placed in the manner as shown in fig. 4, and one of the two ends (e.g., the second end 120, i.e., the right portion of the optical assembly 100) of the prism waveguide 180 is blocked by the blocking plate 402.

And 2, lighting the parallel light generator 400, wherein the parallel light emitted by the parallel light generator 400 enters the detector 200 through the left side of the optical assembly 100 to obtain a focus point A of the parallel light generator 400.

And 3, keeping the system unchanged, only moving the light shielding plate 402 to shield the first end 110 (the left light incident position of the optical assembly 100) of the two ends of the prism waveguide 180, lighting the parallel light generator 400, enabling the parallel light generated by the parallel light generator 400 to enter the detector 200 through the right side of the optical assembly 100, and measuring that the focus point of the parallel light generator 400 is B.

And 4, calculating the difference value of the focus point A and the focus point B, wherein the difference value is the left and right objective system error of the whole system, and writing the system error into the detector 200.

And finishing the calibration process.

The application provides an optical assembly, contain its testing arrangement and test method, can adopt a measuring equipment, measure binocular calibration simultaneously, calibration while testing, and more accurate.

The technical content and technical features of the present application have been disclosed as above, however, one skilled in the art may make various substitutions and modifications based on the teaching and disclosure of the present application without departing from the spirit of the present application. Therefore, the protection scope of the present application should not be limited to the disclosure of the embodiments, but should include various alternatives and modifications without departing from the scope of the present application, which is covered by the claims of the present patent application.

Claims

1. An optical assembly, comprising:

a prism waveguide including a plurality of prisms, adjacent ones of the plurality of prisms being attached at a prism interface, a first prism interface being located at a middle position of the prism waveguide, a second prism interface being located at both ends of the prism waveguide and being substantially symmetrical about the middle position of the prism waveguide, the second prism interface located at one of the both ends of the prism waveguide being substantially parallel to the first prism interface; and

and the 1/4 wave plate is positioned below the first prism interface and is matched with the first prism interface so as to reflect the light which is incident into the middle position of the prism waveguide from the two ends of the prism waveguide into the output light out of the prism waveguide.

2. The optical assembly of claim 1, wherein a third prism interface is located at both ends of the prism waveguide, and wherein the second prism interface and the third prism interface located at the same end of the prism waveguide are substantially parallel.

3. The optical assembly of claim 1, wherein the prism interface is angled between 20 degrees and 70 degrees from the adjacent base surface of the respective prism.

4. A test device, characterized in that it comprises:

an optical assembly according to any one of the preceding claims 1-3; and

a detector for receiving the output light and producing a detection result.