Method of determining the pose of an eyewear

Abstract

An aspect of the disclosure relates to a method of determining a pose of an eyewear. The method can comprise detecting, with a digital device, a light signal reflected from the eyewear, the digital device comprising a light sensor for an invisible wavelength range, and calculating a pose of the eyewear using the light signal. The pose can be at least one of a yaw angle, a pitch angle, a roll angle. A second aspect of the disclosure relates to an eyewear comprising at least a first lens. The first lens can comprise a first coating having a reflective action in the invisible wavelength range. The first coating can further comprise a pattern having an orientation. A third aspect of the disclosure relates to a computer program product comprising instructions which, when the program is executed by a digital device, cause the digital device to carry out the method.

Description

Technical Field

[0001] This disclosure relates to a method for determining the posture of an eyewear, an eyewear comprising at least a first lens for use with the method, and a computer program product comprising instructions for performing the method. Background Technology

[0002] Determining a person's head pose involves acquiring images from the head and processing them using computationally expensive algorithms. Therefore, even with optimized algorithms, continuous measurements to determine head pose are a significant factor contributing to low device energy efficiency, and in the case of battery-powered devices, battery consumption is accelerated.

[0003] Therefore, there is a desire to improve the energy efficiency of determining human head posture using digital devices. Summary of the Invention

[0004] This disclosure relates to determining the posture of eyewear and provides several solutions, including a method for determining the posture of a person's head when wearing eyewear, which has improved energy efficiency.

[0005] One aspect of this disclosure relates to a method for determining the posture of an eyewear garment. The method may include detecting an optical signal using a digital device, the digital device including a light sensor for an invisible wavelength range. The method may further include calculating the posture of the eyewear garment using the optical signal. The optical signal may be a signal reflected from the eyewear garment when the eyewear garment is within the sensor's range. The posture may be at least one of the following: yaw angle, pitch angle, and roll angle.

[0006] According to various embodiments, the method may further include using optical signals to determine the distance between the digital device and the eyewear.

[0007] According to various embodiments, the method may further include determining reference coordinates of the digital device; and using the reference coordinates to calculate the pose of the eyewear.

[0008] According to various embodiments, the optical signal may include a first signal and a second signal. An eyepiece may be configured to reflect light from the first and second signals. The first signal may be reflected by a first coating at a first location on the eyepiece, and the second signal may be reflected by a second coating at a second location on the eyepiece.

[0009] According to various embodiments, the first signal may have a first wavelength and the second signal may have a second wavelength different from the first wavelength.

[0010] According to various embodiments, the optical signal may include a first signal with a first wavelength and a second signal with a second wavelength different from the first wavelength, and wherein an optical sensor detects the first optical signal and the second optical signal.

[0011] According to some embodiments, the first coating may be located at a first position on the frame. Alternatively or additionally, the first coating may be located at the first lens.

[0012] According to some embodiments, the first coating may be located at a first position on the frame, and the second coating may be located at a second position on the frame. Alternatively or additionally, the first coating may be located at a first lens, and the second coating may be located at a second lens. In other still alternatives, the first coating may be located at the first position and the second coating may be located at the second position, with the first and second positions located on the same lens.

[0013] According to various embodiments, eye-wearing devices can be configured to reflect light of a first wavelength and a second wavelength.

[0014] According to various embodiments, a first signal can be reflected by a first coating at a first position of the eyewear, and a second signal can be reflected by a second coating at a second position of the eyewear.

[0015] According to various embodiments, a predetermined distance between the first position and the second position can be used to calculate the posture of the eyewear.

[0016] According to various embodiments, the method may include determining a yaw angle. According to various embodiments, determining the yaw angle may include determining a first relative distance between the eyewear and the sensor using a first optical signal. Determining the yaw angle may further include determining a second relative distance between the eyewear and the sensor using a second optical signal. Determining the yaw angle may further include calculating the yaw angle using the first relative distance and the second relative distance.

[0017] According to various embodiments, the method may include determining a pitch angle. According to various embodiments, determining the pitch angle may include using a first optical signal to determine a first deviation from a first maximum signal strength. Determining the pitch angle may further include using a second optical signal to determine a second deviation from a second maximum signal strength. Determining the pitch angle may further include using the first deviation and the second deviation to calculate the pitch angle.

[0018] According to various embodiments, the method may include determining a tilt angle. According to various embodiments, determining the tilt angle may include using a first optical signal to determine a first deviation from a first maximum signal strength. Determining the tilt angle may further include using a second optical signal to determine a second deviation from a second maximum signal strength. Determining the tilt angle may further include using the first deviation and the second deviation to calculate the tilt angle.

[0019] According to some embodiments, detecting the light signal may include capturing an image of a pattern on the eyewear, and calculating the pose of the eyewear may include:

[0020] Determine the deviation between the captured image and the predetermined pattern; and

[0021] Use this deviation to calculate the attitude.

[0022] According to some embodiments, the attitude may include a tilt angle, and wherein determining the deviation may include identifying the orientation of the pattern; and

[0023] Calculating the roll angle may include using a predetermined pattern as a reference to calculate the angle difference of orientation.

[0024] According to some embodiments, determining the deviation may include identifying a first dimension and a second dimension of the pattern, wherein the first dimension and the second dimension intersect, and wherein the attitude may include one or both of pitch and yaw angles, and calculating one or both of pitch and yaw angles may include calculating the difference between the first dimension and / or the second dimension and the predetermined pattern.

[0025] According to various embodiments, the optical sensor may be selected from at least one of the following: an infrared camera, an infrared time-of-flight sensor, a non-imaging sensor, or a combination thereof. The non-imaging sensor may be a non-imaging infrared sensor, such as a non-imaging infrared photodiode, or a non-imaging infrared time-of-flight sensor.

[0026] A second aspect of this disclosure relates to an eyewear comprising at least a first lens. The first lens may include a first coating that has a reflective effect in the invisible wavelength range. The first coating may further include an oriented pattern.

[0027] According to various embodiments, the pattern may not have any rotational symmetry greater than 8.

[0028] According to various embodiments, the eyepiece may further include a second lens, and the second lens may have a second coating. The second coating may have the same pattern as the first lens. In some embodiments, the pattern of the second coating may be a mirror image of the first coating.

[0029] According to various embodiments, the first coating and the second coating may have different reflectance spectra. According to various embodiments, each of the first coating and the second coating has a different reflectance spectral region.

[0030] A third aspect of this disclosure relates to an eyewear that includes at least a first coating having a reflective effect in the invisible wavelength range, and further includes, for example, a frame for holding lenses, the frame including the first coating. Alternatively or additionally, the frame may include a second coating.

[0031] According to various embodiments, the first coating and the second coating may have different reflectance spectra. Each of the first coating and the second coating may have a different reflectance spectral region. The coating may be an AR coating, which may include reflectance peaks in the near-infrared spectrum.

[0032] The fourth aspect of this disclosure relates to a computer program product including instructions that, when executed by a digital device, cause the digital device to perform a method according to various embodiments of the first aspect.

[0033] According to various embodiments, these instructions may further include determining a difference between the pose and a predetermined pose reference. These instructions may further include initiating a user alarm when the difference exceeds a predetermined threshold.

[0034] According to various embodiments, at least one lens of the eyepiece has an IR reflective coating. This coating is partially or fully polarized, and the polarization angle of each lens can be different. A separate device, which can be attached to a smartphone or tablet, includes one or more IR transmitters and one or more receivers, as well as optional polarizing filters. Based on the amount of light received by the receivers, the distance to the lenses and different orientation angles (yaw, pitch, tilt) can be calculated. Attached Figure Description

[0035] Embodiments of the invention will now be described by way of example and with reference to the following figures, in which:

[0036] - Figure 1 A schematic diagram of an eye-wearing device 120 is shown with respect to a coordinate system 110 having an x-axis (x), a y-axis (y), and a z-axis (z) according to various embodiments;

[0037] - Figure 2A and Figure 2B This is a schematic representation illustrating examples of how to determine the yaw angle of an eyewear device using a digital device, according to various embodiments;

[0038] - Figure 3A and Figure 3B This is a schematic representation illustrating examples of how to determine the pitch angle of an eyewear device using a digital device, according to various embodiments;

[0039] - Figure 4A and Figure 4BThis is a schematic representation illustrating examples of how to determine the tilt angle of an eyewear device using a digital device, according to various embodiments;

[0040] - Figure 5A and Figure 5B The states of the display of a digital device 550 for two different tilt angles for an eye-wearing device 520 according to various embodiments are shown;

[0041] - Figure 6A and Figure 6B The states of the display of a digital device 650 at two different distances from an eye-wearing device 620 are shown according to various embodiments;

[0042] - Figure 7 , Figure 8 and Figure 9 Different coating patterns for eyewear are shown according to various embodiments;

[0043] - Figure 10 The device architecture of an exemplary digital device 1000 that can be used according to various embodiments is shown;

[0044] - Figures 11 to 15 Several exemplary coatings that can be used in eyewear according to various embodiments are shown;

[0045] - Figure 16 A graph is shown that compares the level of reflection between two test frames at different distances;

[0046] Figure 17 The reflectivity of AR coatings according to some embodiments is shown. These figures are schematic, and the elements therein may have different scales or different positions to improve readability. Detailed Implementation

[0047] In the following description, the accompanying drawings are not necessarily drawn to scale, and some features may be shown in generalized or schematic form for clarity and brevity or for informational purposes. Furthermore, although several different embodiments of making and using are discussed in detail below, it should be understood that many inventive concepts that can be implemented in a variety of contexts are provided as described herein. The embodiments discussed herein are merely representative and not limiting.

[0048] The various embodiments disclosed herein relate to various aspects of this disclosure, such as methods for determining the posture of an eyewear, computer program products including instructions for performing the method, and eyewear. The embodiments disclosed in conjunction with one embodiment and their explanations can be applied to other embodiments. For example, embodiments and explanations of the method can be applied to this eyewear.

[0049] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0050] Various embodiments also relate to digital devices that include an integrated light sensor or are coupled to a light sensor, or wherein the light sensor is partially integrated into the digital device and a portion of the light sensor is coupled to the digital device. Examples of digital devices are: mobile phones, tablets, smartwatches, handheld devices, laptops, and wearable electronic devices. The term "coupleable" can mean being able to communicate with, such as transmitting information, and can further mean being able to be mechanically attached.

[0051] As used herein and according to various embodiments, the term "eyewear" can refer to an optical article configured for a user to wear on or in relation to the eyes (e.g., in front of the user's eyes). For example, eyewear can be selected from the group consisting of: eyeglasses, sunglasses, head-mounted devices, augmented reality devices, virtual reality devices, contact lenses, and a pair of contact lenses. According to various embodiments, eyewear can be electronically passive (i.e., not electronically powered). According to various embodiments, "lenses" can have corrective power or may not have corrective power (e.g., plano lenses).

[0052] As used herein and according to various embodiments, the term "visible spectrum" can be defined as light having wavelengths from 380 nm to 780 nm in a vacuum.

[0053] As used herein and according to various embodiments, the term "coating" can include the meaning of depositing material to form a layer (e.g., depositing material from a solution to form a layer on a frame or lens), and can include the meaning of laminating a pre-formed layer, such as attaching safety tape to a frame or bonding an AR coating formed on a temporary substrate to a lens or frame. Some non-limiting examples of depositing material to form a layer are: spin coating, sputtering, and physical vacuum deposition.

[0054] As used herein and according to various embodiments, the term "near-infrared spectrum" (or the abbreviation NIR spectrum) can be defined as light having a wavelength in vacuum longer than 780 nm and shorter than or equal to 1400 nm (e.g., shorter than 1100 nm, optionally from 800 nm to 1000 nm). The term "infrared" can include near-infrared. For example, an infrared sensor can be a near-infrared sensor.

[0055] The expression “a [or the] first wavelength of light” (or the second) can mean that the light includes a first (second) wavelength in its spectrum, for example, having an intensity peak at the first (second) wavelength.

[0056] It should be understood that any reference to “frame” in this document refers to a portion of an eyewear that is not composed of lenses. For example, eyeglasses in an eyewear can include a frame and may include lenses attached to the frame, unless otherwise expressly stated, in which case the lenses are not part of the frame.

[0057] According to various embodiments, detecting the optical signal is understood to include detecting the optical signal from a reference point facing the front of the eye-wearing device. The front is opposite to the inner side facing the user when the user wears the eye-wearing device. The reference outside the eye-wearing device may be physically separated from the eye-wearing device.

[0058] According to various embodiments, the attitude parameter can be at least one of yaw angle, pitch angle, and roll angle. Therefore, the attitude of the eyewear can be defined by at least one of the yaw angle, pitch angle, and roll angle of the eyewear. In some embodiments, the attitude can be partially determined, for example, by determining only one or two of the yaw angle, pitch angle, and roll angle. In addition to attitude, the distance from the eyewear to the digital device can also be determined. This distance can be an average distance or can be selected from a range from the shortest to the longest distance, for example, when the yaw angle is not zero.

[0059] Figure 1 An exemplary eyewear 120 is shown with respect to a coordinate system 110 having an x-axis (x), a y-axis (y), and a z-axis (z). Figure 1 The diagram also shows the roll direction with a roll angle, the yaw direction with a yaw angle, and the pitch direction with a pitch angle.

[0060] Lateral tilting motion is rotational motion about the x-axis of the coordinate system. Figure 1 The diagram illustrates the tilt of an eye-wearing device about the x-axis. For a user wearing an eye-wearing device, the tilting motion is a rotation within the frontal plane. For example, when a user tilts their head to bring their left ear closer to their left shoulder, they are performing a left tilting motion. When the head is in a stationary position regarding tilt, for example, with each ear equidistant from the shoulder on the same side, a tilt angle of zero can be defined.

[0061] Horizontal yaw motion is a rotational motion about the y-axis of the coordinate system. Figure 1 The diagram illustrates the yaw of an eye-wearing device about the y-axis. For a user wearing an eye-wearing device, the yaw motion is a rotation within the cross-section. For example, when the user rotates their head to the left, the yaw angle increases, while when rotating to the right, the yaw angle decreases. When the head is in a stationary position regarding the yaw, for example, when the ears are parallel to the shoulders, the tilt angle can be defined as zero.

[0062] Pitch motion is a rotational motion about the z-axis of the coordinate system. Figure 1The diagram illustrates the pitch of an eye-wearing device about the z-axis. For the user of the eye-wearing device, pitch motion is rotation within the sagittal plane. For example, when the user tilts their head upward, the pitch angle increases, and when they tilt downward, the pitch angle decreases.

[0063] In some embodiments, a reference calibration is performed. For example, a reference eyewear posture can be defined as a reference, such as by measuring the glasses in a desired reference posture. In such a reference, the yaw, pitch, and roll angles can each be defined as zero. The origin of the reference coordinate system can be specified relative to the eyewear, for example, at a point behind the eyewear, where "behind" refers to the side of the lens facing the user. For a user wearing glasses, an exemplary reference coordinate system could be approximately at the center of the user's head. According to various embodiments, the eyewear posture can be a relative posture. The deviation from the reference determined by measurement may be sufficient to determine the desired relative posture of the eyewear. Therefore, an absolute reference coordinate system may not be necessary.

[0064] In some embodiments, a geodetic reference may be used. For example, the pitch angle of an eye-wearing device that is substantially parallel to the horizontal line may be defined as zero. For a user of the eye-wearing device, a pitch angle of zero may mean that the head is looking in a direction parallel to the horizontal line. A preset angle parallel to the horizontal line may be used instead of an angle of zero. The tilt angle of an eye-wearing device that is substantially parallel to the horizontal line may be defined as zero. For a user of the eye-wearing device, a tilt angle of zero may mean that a line passing through the center of the pupil is parallel to the horizontal line. However, embodiments of this disclosure are not limited to geodetic references; for example, depending on the desired application, any posture may be defined as a reference.

[0065] Various embodiments can explain the relationship between the posture of the eyewear (one or more of yaw, tilt, and pitch) and the posture of the user's head (or one or more of yaw_user, roll_user, and pitch_user). This relationship can be an identity or can use correction factors (Cy, Cr, Cp). For example, yaw_user = Cy * yaw, roll_user = Cr * roll, pitch_user = Cp * pitch. In the case of an identity, the corresponding correction factor is 1.

[0066] An explanation of how to determine the posture of eyewear is provided along with the following non-limiting examples.

[0067] Figure 2AThis is a schematic representation illustrating an example of how to determine the yaw angle of an eyepiece using a digital device. The digital device can be configured to determine the distance between the digital device (or a predetermined position on the digital device) and each of a first and second lens. The determined distance can be used to determine the yaw angle. Figure 2A In the example, digital device 210 includes a light sensor configured to determine the distance (d1) to a first lens 221 and the distance (d2) to a second lens 222 of glasses 220.

[0068] The first lens 221 and the second lens 222 may include different physical properties that can be used to measure distance. For example, the first lens 221 may include a first coating having a first reflectivity in a first wavelength (λ1), which may be greater than 0.2, for example, greater than 0.8. The second lens 222 may include a second coating having a second reflectivity in a second wavelength (λ2), which may be greater than 0.2, for example, greater than 0.8. The reflectivity of the first coating in the second wavelength may be less than the first reflectivity; for example, the reflectivity of the first coating in the second wavelength may be less than 0.1, for example, essentially zero. The reflectivity of the second coating in the first wavelength may be less than the second reflectivity; for example, the reflectivity of the second coating in the first wavelength may be less than 0.1, for example, essentially zero.

[0069] According to various embodiments, an optical sensor can be configured to receive optical signals. The optical signals may include a first optical signal having a first wavelength and a second optical signal having a second wavelength different from the first wavelength. The optical sensor can be further configured to detect the light intensities of the first and second optical signals independently of each other. For example, the optical sensor may include a first photodetector capable of detecting the first wavelength of the first optical signal but not the second wavelength, and a second photodetector capable of detecting the second wavelength but not the first wavelength. In another example, the optical sensor may include a first light source capable of emitting light having a first wavelength but substantially not having a second wavelength, and a second light source capable of emitting light having a second wavelength but substantially not having a first wavelength. Light having a first wavelength and a second wavelength may also be emitted alternately. The optical signals may therefore include a first optical signal of a first wavelength and a second optical signal of a second wavelength alternating in time. In the example, a single photodetector may be used to detect both optical signals at the corresponding time of each signal. Other means for determining distance may be implemented, which are capable of independently determining the distance between the optical sensor and an eye-worn device. For example, a time-of-flight optical sensor having a first selectivity to a first lens (e.g., a first wavelength) and a second selectivity to a second lens (e.g., a second wavelength) may be used. The optical sensor may include or be a time-of-flight optical sensor.

[0070] In some embodiments, the difference between the first distance and the second distance can be used to determine the yaw angle. In one example, the yaw angle can be determined as: yaw angle = (arcsin((d2-d1) / PD) (Equation 1), where PD is a predetermined constant, such as a predetermined distance between the center of the first lens 221 and the center of the second lens 222, or a predetermined pupillary distance associated with the eyeglasses.

[0071] exist Figure 2A In this example, digital device 210 includes a light sensor that determines a distance d1 between the light sensor and a first lens 221, and a distance d2 between the light sensor and a second lens 222. In this example, d1 = d2. Figure 2A By using the above formula, the yaw angle of zero degrees can be obtained.

[0072] A variation of the above example is illustrated using a digital device 230 that includes a light sensor, which determines the distance d'1 between the light sensor and the first lens 241, and the distance d'2 between the light sensor and the second lens 242. In this example, d'2 > d'1. The negative yaw angle indicating leftward rotation is determined using the above formula (using d'1 instead of d1, d'2 instead of d2, and a predetermined constant PD). Alternatively, only the absolute yaw angle indicating the deviation from zero can be determined.

[0073] Figure 2B A schematic geometric representation of the yaw between eyeglasses 220 and 240, and the yaw angle between eyeglasses 220 and 240, is shown. Although in Figures 2A to 2B Glasses 220 and 240 are illustrated by way of example, but this disclosure is not limited thereto. Although... Figure 2A and Figure 2B The two lenses of an eyepiece describe a difference in reflectivity, but this disclosure is not limited thereto. For example, a difference in reflectivity can be provided in any part of the eyepiece, such as on two parts of a single lens, where PD is the distance between the centers of the two parts. According to various embodiments, different coatings can provide different reflectance spectra and different reflectivities, and these coatings can be substantially transparent in visible light.

[0074] Combination Figure 3A and Figure 3B An exemplary method for determining the pitch angle is explained.

[0075] Figure 3AThis is a schematic representation illustrating an example of how a digital device can be used to determine the pitch of an eyewear garment. A light sensor, and thus a digital device (e.g., when the light sensor is coupled to or integrated into the digital device), can be configured to detect reflected light from the eyewear garment and measure the intensity of the reflected light. The digital device can be further configured to determine the deviation of the reflected light intensity from a predetermined light intensity. The reflected light may include both a first light signal and a second light signal. The reflected light may be light reflected by one or both of the first and second lenses, for example, when incident by light emitted from a light source included in the light sensor or otherwise incorporated into the digital device. The pitch angle can be determined by the deviation of the reflected light intensity from the predetermined light intensity, for example, using the formula: Pitch angle = arccos(i / i_max), where i is the measured reflected light intensity and i_max is the predetermined light intensity. For example, the predetermined light intensity may be the light intensity measured during a calibration phase.

[0076] exist Figure 3A In the example, digital device 310 includes a light sensor. Figure 3A In this context, glasses 320, including a first lens 321 and a second lens 322, are used as an example of eyewear; however, embodiments of this disclosure are not limited thereto. Light 312 can be emitted from a light source (e.g., a first light source) of the digital device 310, which may be integrated into a light sensor. Light 312 can be reflected as reflected light 314 by one or both of the first lens 321 and the second lens 322. The intensity of the reflected light 314 can be measured by the light sensor. When the pitch angle of the glasses 320 relative to the digital device 310 is zero (e.g., when the pitch angle of the glasses 320 relative to the digital device 310 is zero), the light 312 is reflected as reflected light 314. Figure 3A As shown in the figure, the reflected light is 314, which is the maximum value (i_max).

[0077] A variation of the aforementioned example is illustrated using a digital device 330 and glasses 340. In this variation, the digital device 330 emits light 332, which can be reflected by the glasses 340 as reflected light 334. Because the glasses 340 has a non-zero pitch angle relative to the digital device 330, a portion of the light 332 is reflected as light 336 that is not received by the light sensor. Therefore, the light sensor only receives the reflected light 334, whose intensity is below the maximum value (i_max).

[0078] The maximum intensity i_max can be determined during the calibration phase. For example, reflected light can be measured at zero pitch angle at different distances. These different distances can be predetermined distances, user-selected distances input into a digital device, distances measured (e.g., using a time-of-flight sensor), or combinations thereof. Calibration data can be post-processed, for example, through interpolation, extrapolation, fitting, or combinations thereof.

[0079] Combination Figure 3BA schematic geometric representation of the pitch between eyeglasses 320 and 340, and the pitch angle between eyeglasses 320 and 340, is described. Although in Figures 3A to 3B Glasses 320 and 340 are illustrated by example, but this disclosure is not limited thereto. Although... Figure 3A One or two lenses may exhibit a difference in reflectivity, but this disclosure is not limited thereto. For example, a difference in reflectivity may be provided in any part of the eyewear, such as on two parts of a single lens, where PD is the distance between the centers of the two parts. While different coatings may provide different reflectivities, these coatings may be substantially transparent in visible light.

[0080] Figure 4A This is a schematic representation illustrating an example of how to use a digital device to determine the tilt of eyewear, such as eyeglasses. The digital device can be configured to determine the tilt of eyewear, for example, the tilt of eyeglasses. Figure 4A In the example, the light sensor and thus the digital device (e.g., when the light sensor is coupled to or integrated into the digital device) can be configured to detect reflected light (i.e., light reflected by the eyewear) and measure the intensity of the reflected light. The reflected light can include a first light signal and a second light signal that are distinct from each other, such that they can be distinguished, for example, measured independently. The reflected light can be light emitted by a light source and reflected by the eyewear. The light source can be included in the digital device; for example, the light source can be integrated into the light sensor. The light emitted by the light source can include a first emitted light signal emitted with a first emission cone (e.g., having a first solid angle) and a second emitted light signal emitted with a second emission cone (e.g., having a second solid angle). The first emission cone can be smaller than the second emission cone, for example, covering only a quarter or less of the area of ​​the second emission cone, where these areas are planar projections. The first and second emission cones can overlap spatially; for example, the first emission cone can be entirely within the space of the second emission cone.

[0081] The first lens 421 and the second lens 422 may include different physical properties that can be used to measure reflectivity. For example, the first lens 421 may include a first coating having a first reflectivity at a first wavelength (λ1), the second reflectivity being greater than 0.2, for example, greater than 0.8. The second lens 422 may include a second coating having a second reflectivity at a second wavelength (λ2), the first reflectivity being greater than 0.2, for example, greater than 0.8. The reflectivity of the first coating at the second wavelength may be much smaller than the first reflectivity; for example, the reflectivity of the first coating at the second wavelength may be less than 0.1, for example, essentially zero. The reflectivity of the second coating at the first wavelength may be much smaller than the second reflectivity; for example, the reflectivity of the second coating at the first wavelength may be less than 0.1, for example, essentially zero.

[0082] According to various embodiments, an optical sensor can be configured to receive optical signals. The optical signals may include a first optical signal having a first wavelength and a second optical signal having a second wavelength different from the first wavelength. The optical sensor can be further configured to detect the light intensity of the first and second optical signals independently of each other. For example, the optical sensor may include a first photodetector capable of detecting the first wavelength of the first optical signal but not the second wavelength, and a second photodetector capable of detecting the second wavelength but not the first wavelength. In another example, the optical sensor may include a first light source capable of emitting light having a first wavelength but substantially not having a second wavelength, and a second light source capable of emitting light having a second wavelength but substantially not having a first wavelength. Light having the first and second wavelengths may also be emitted alternately. The optical signals may therefore include a first optical signal with a first wavelength and a second optical signal with a second wavelength alternating in time. In the example, a single photodetector may be used to detect both optical signals at the corresponding time of each signal. Other means for determining the light intensity may be implemented, which are capable of independently determining the light intensity of the first and second optical signals.

[0083] In some embodiments, the tilt angle can be determined using the difference between the intensity of a first light signal and the intensity of a second light signal. In one example, a transfer function can be used to determine the tilt angle. According to some embodiments, it may be sufficient to determine whether the tilt angle is within a predetermined range. Based on posture studies, it has been found that the head tilt angle when using digital devices is typically close to zero degrees. Therefore, the tilt angle of eyewear worn by the user is typically close to zero degrees (as shown in glasses 420). In some embodiments, it may be sufficient to determine the yaw and pitch angles as the posture of the eyewear without measuring the tilt angle.

[0084] Demonstrated using digital device 430 and glasses 440 Figure 4A A variation of the example above. (Also in Figure 4A In this variant, digital device 430 emits light 432 and 438 through two different cones, identical to those in the previous example. Light 432 and 438 can be reflected by eyeglasses 440. Because eyeglasses 440 has a non-zero tilt angle relative to digital device 430, the ratio of the intensity of the first light signal 432 (reflected by lens 441) to the intensity of the second light (reflected by the two lenses 441 and 442) is less than in the previous example (where the tilt is zero).

[0085] Figure 4B A schematic geometric representation of the tilt between eyeglasses 420 and 440 and the tilt angle between eyeglasses 420 and 440 is shown. Although in Figures 4A to 2B Glasses 420 and 440 are illustrated by way of example, but this disclosure is not limited thereto. Although... Figure 4A and Figure 4BThe two lenses of each eyewear describe a difference in reflectivity, but this disclosure is not limited thereto. For example, a difference in reflectivity can be provided in any part of the eyewear, such as on the two parts of a single lens. According to various embodiments, different coatings can provide different reflectivities, and these coatings can be substantially transparent in visible light.

[0086] Figure 5A and Figure 5B A digital device 550 is shown, including an external sensor unit 510 coupled to the digital device 550; however, this sensor unit can also be internal, for example, integrated into the digital device. The sensor unit 510 includes a light sensor. The light sensor is configured to determine the pitch angle of an eyewear 520. For illustrative purposes, the eyewear 520 is a pair of glasses including a first lens 521 and a second lens 522. The first lens 521 and the second lens 522 can be configured to reflect light emitted by the sensor in the form of an optical signal. As described according to various embodiments, the sensor can be configured to receive the optical signal and use the optical signal to calculate the pitch angle. Figure 5A and Figure 5B The example shown illustrates a pitch angle related to a digital device. However, in various embodiments, a reference attitude other than that of the digital device may also be used.

[0087] For example, an acceptable pitch angle can be within + / - 39 degrees (inclusive), such as within + / - 37 degrees (inclusive). Figure 5A In this case, the pitch angle of the eyewear is zero, and therefore within an exemplary predetermined pitch angle range of + / - 39 degrees. When the pitch angle is within the predetermined pitch angle range, the display 552 of the digital device 550 displays image 554. When the eyewear 520 is not within the predetermined pitch angle range, for example, when the eyewear 520 has such... Figure 5B At a pitch angle of -16 degrees, as shown, the image displayed on display 552 changes to, for example, blank or a symbol or message informing the eyewear 520 that its posture is outside the predetermined range. Once the eyewear 520 returns to a pitch angle within the predetermined range, display 552 can return to a normal mode in which it displays the desired image (e.g., image 554). Image 554 may represent a normal mode in which the digital device has its expected (i.e., normal) operation. Similarly, a tilt angle within a certain range (e.g., within + / -6 degrees (inclusive)) can be defined as acceptable.

[0088] Determining the posture of eyewear can be used to infer the posture of the user wearing eyewear. For example, one or more of the yaw, pitch, and roll angles can be measured. If one of the measured angles is outside a predetermined range, the user can receive feedback to correct their posture.

[0089] In addition to measuring the attitude, the digital device can also be configured to measure the distance between the digital device and the eye wear. For example, the light sensor can be configured to measure the distance between the digital device 650 and the eye wear 620, as shown in the examples of Figure 6A and Figure 6B shown.

[0090] Figure 6A and Figure 6B show a digital device 650 including an external sensor unit 610 coupled to the digital device 650, however, the sensor unit can also be internal, for example, integrated into the digital device. The sensor unit 610 includes a light sensor. The light sensor is configured to determine the distance from the light sensor to the eye wear 620. For illustrative purposes, the eye wear 620 is glasses including a first lens 621 and a second lens 622. The first lens 621 and the second lens 622 can be configured to reflect the light emitted by the sensor in the form of an optical signal. As described according to various embodiments, the sensor can be configured to receive the optical signal and determine the distance. The distance can also be determined by other means other than the light sensor.

[0091] For example, an acceptable distance can be d1. In Figure 6A the distance of the eye wear is d1 and within an exemplary predetermined distance range greater than or equal to d1. When the distance is within the predetermined distance range, the display 652 of the digital device 650 shows an image 654. When the eye wear 620 is not within the predetermined distance range, for example, when the eye wear 620 has a distance d2 < d1 as shown in Figure 6B the image displayed on the display 652 changes to, for example, blank or a symbol or message notifying that the distance of the eye wear 620 is outside the predetermined range. Once the eye wear 620 returns to a distance within the predetermined distance range, the display 652 can return to the mode of showing the desired image (for example, image 654). The image 654 can represent a normal mode in which the digital device has its expected (i.e., normal) operation.

[0092] According to various embodiments, the optical signal can include a first signal of a first wavelength and a second signal of a second wavelength different from the first wavelength, and wherein the light sensor is configured to detect the first optical signal and the second optical signal. According to various embodiments, the eye wear is configured to reflect light of the first wavelength and the second wavelength, as will be described in conjunction with Figures 7 to 9This is illustrated by way of example. According to various embodiments, an eyepiece may include a first coating at a first location and a second coating at a second location, and these coatings may be different from each other. A first signal may be reflected by the first coating, and a second signal may be reflected by the second coating. The first and second locations may be on the same lens (e.g., a single contact lens or a single spectacle lens), on different lenses (e.g., on a left and right contact lens, or on a left and right spectacle lens), or on a non-lens portion (e.g., an eyeglass frame).

[0093] Figure 7 Eyeglasses 720, as an exemplary eyewear device, are shown, comprising a first lens 721 and a second lens 722. The first lens 721 includes a first coating 725 that has reflective properties, for example, in the invisible wavelength range. This first coating may include peak reflectance at or within + / -20 nm of a first wavelength λ1. The first coating 725 may be patterned, for example as… Figure 7 The parallel stripes are shown. The second lens 722 includes, for example, a second coating 726 that has a reflective effect in the invisible wavelength range. This second coating may have a peak reflectance at or within + / -20 nm of a second wavelength λ2, where λ1 is different from λ2. The second coating 726 may be patterned, for example, as shown in the diagram. Figure 7 The parallel stripes are shown. The first coating 725 and the second coating 726 may have different reflective properties. The first coating 725 and the second coating 726 may be uniform or have a pattern, such as the strip form shown. The pattern may be further used to detect the orientation of pattern features (e.g., the elongation direction of the strips) relative to a sensor (e.g., a near-infrared camera).

[0094] Figure 8 Eyeglasses 820, shown as an exemplary eyewear device, include a first lens 821 and a second lens 822. The first lens 821 includes a first coating 831 that has reflective properties, for example, in the invisible wavelength range. This first coating may include peak reflectance at or within + / -20 nm of a first wavelength λ1. The first coating 831 may have a pattern, for example, a square (e.g.,...). Figure 8The first lens 821 may include a second coating 832, and may further include a third coating 833 and / or a fourth coating 834. Each of the first, second, third, and fourth coatings may be different from each other, for example, they may have different reflectivities. The second lens 822 may include the same coating as the first lens 821, for example, in the same arrangement, a mirror arrangement, a rotated arrangement, a translated arrangement, or a combination thereof. For example, coating 841 may have the same reflectivity as the first coating 831, coating 842 may have the same reflectivity as the second coating 832, coating 843 may have the same reflectivity as the third coating 823, and coating 844 may have the same reflectivity as the fourth coating 824.

[0095] Figure 9 Eyeglasses 920, shown as an exemplary eyewear device, include a first lens 921 and a second lens 922. The first lens 921 and / or the second lens 922 may include coatings 925, 926 that have reflective properties, for example, in the invisible wavelength range. The coatings 925, 926 may be in the form of a pattern, for example, spaced-apart coating portions, such as circular (e.g.,...) Figure 9 (As shown), a polygon, square, ellipse, or other suitable shape with more than four sides. Coatings 925 and 926 may exist as a first coating 925 on the first lens 921, as a second coating 926 on the second lens 922, or on both lenses. For example, the pattern may be an arrangement of coated portions in rows and columns, such as... Figure 9 The rows shown are substantially perpendicular to the columns. Patterns can be used to detect the orientation of pattern features (e.g., rows or columns) relative to a sensor (e.g., a near-infrared camera).

[0096] According to various embodiments, the pattern may not have any rotational symmetry greater than 8; for example, the pattern may not have any rotational symmetry greater than 4. Rotational symmetry of 4 or lower can allow for easier detection of the roll angle because the rotational symmetry angle is larger (e.g., 90 degrees in the case of rotational symmetry of 4).

[0097] While some embodiments and examples of this disclosure are explained in conjunction with eyeglasses, eyeglasses have been used for illustrative purposes, and this disclosure is not limited thereto. For example, eyewear may be eyeglasses, sunglasses, head-mounted devices, augmented reality devices, virtual reality devices, contact lenses, a pair of contact lenses, or other suitable eyewear. The eyewear may have one lens, two lenses, or more lenses.

[0098] According to various embodiments, a predetermined distance between the first position and the second position can be used to calculate the posture of the eye-wearing device, such as PD in Equation 1. The predetermined distance can be the distance between the center of the first position and the center of the second position. The predetermined distance is greater than zero.

[0099] According to some embodiments, detecting the light signal may include capturing an image of a pattern on an eyewear device. For example, the light sensor may be or include a camera, such as an infrared camera. Calculating the pose of the eyewear device may include, for example, using a pattern matching algorithm to determine the deviation between the captured image and a predetermined pattern; and using the deviation to calculate the pose. According to some embodiments, the pose may include a tilt angle, wherein determining the deviation may include identifying the orientation of the pattern; and wherein calculating the tilt angle may include using the predetermined pattern as a reference to calculate the angular difference in orientation. In one example, the pattern matching algorithm may progressively rotate an image of the captured pattern of the eyewear device relative to a predetermined desired pattern and perform matching, the angle corresponding to the best match being considered the tilt angle. The matching may be scale-invariant. Instead of rotating the captured image, the algorithm may rotate the predetermined desired pattern.

[0100] According to some embodiments, determining the deviation may include identifying a first dimension and a second dimension of the pattern, wherein the first dimension (or an extension thereof) and the second dimension (or an extension thereof) intersect, and wherein the attitude may include one or both of pitch and yaw angles, and calculating one or both of the pitch and yaw angles may include calculating the difference between the first dimension and / or the second dimension and a predetermined pattern. Attitude calculation may further include using a measured distance between a light sensor and an eye-wearing device. For illustrative purposes, [the following is used...] Figure 9 For an eye-worn device, the first dimension can be column distance 931, and the second dimension can be row distance 932. (For a given distance between the light sensor and the eye-worn device) A measured row distance 932 that is less than a reference expected row distance indicates yaw, and the measured row distance 932 can be used to calculate the yaw angle. (For a given distance between the light sensor and the eye-worn device) A measured column distance 931 that is less than a reference expected column distance indicates pitch, and the measured column distance 931 can be used to calculate the pitch angle.

[0101] According to various embodiments, the optical sensor may be selected from or include at least one of the following: an infrared camera, an infrared time-of-flight sensor, a non-imaging sensor, or a combination thereof. The non-imaging sensor may be a non-imaging infrared sensor, such as a non-imaging infrared photodiode, or a non-imaging infrared time-of-flight sensor.

[0102] Various embodiments relate to a computer program product including instructions that, when executed by a computer, cause the computer to perform methods as explained herein according to various embodiments. In some embodiments, the computer may be included in a digital device, or the computer may be a digital device. According to various embodiments, the instructions may further include determining a difference between an attitude and a predetermined attitude reference. The instructions may further include initiating a user alarm when the difference is greater than a predetermined threshold. For example, the user alarm may be in the form of an sound or a change in information displayed on a display. The computer program product may execute on a computer or on a distributed system including at least one microprocessor. In an example, when the attitude of the eyewear relative to the light sensor changes from greater than a predetermined attitude range to less than a predetermined attitude range, the instructions may be to change the brightness, issue a written notification, or turn off the display of the digital device. Similarly, when the attitude of the eyewear relative to the light sensor returns to greater than the predetermined attitude range, the instructions may be to restore (e.g., restore the brightness, delete the written notification, or turn the display back on).

[0103] Figure 10 An architecture of an exemplary computer 1000, which can be used according to various embodiments, is shown. The computer 1000 includes a bus 1100 through which one or more devices can communicate with each other. Figure 10 In the example, the following devices connected to bus 1100 are shown: CPU 1010; main memory 1020, such as RAM; storage device 1030, such as hard disk drive, solid-state drive, flash drive; communication device 1040, such as for wired or wireless communication, such as WiFi, USB, Bluetooth; display interface 1050 and other user interfaces 1060, such as for user input; however, this disclosure is not limited thereto, and a computer may include more or fewer devices, and the computer and / or bus may have other architectures different from the one shown.

[0104] Various embodiments relate to a method for determining the posture of an eyewear. In some embodiments, the eyewear is not worn by a user. In addition to the method for determining the posture of an eyewear, this disclosure also relates to a method for processing a user's posture, the method comprising: detecting an optical signal using a digital device including a light sensor for an invisible wavelength range; calculating the posture of the eyewear using the optical signal, wherein the optical signal is a signal reflected from the eyewear when it is within the sensor range and worn by a user; and wherein the posture is at least one of: yaw angle, pitch angle, and roll angle. If it is determined that the user's posture is outside a predetermined optimal range, posture correction suggestions may be provided to the user. The posture correction suggestions may be provided by a display of the digital device. According to various embodiments, the user's posture may include or substantially be the posture of the head relative to the neck.

[0105] According to various embodiments, an eye-wearing device may include an optical substrate and an interference coating. The optical substrate may have a front main surface and a rear main surface on opposite sides, wherein the front main surface is intended to face the user when the user is wearing the eye-wearing device.

[0106] According to various embodiments, a coating (e.g., a first coating, a second coating) that has reflective properties in the invisible wavelength range, as used in various embodiments, can be an interference coating. This interference coating can be disposed on at least one of the front and rear principal surfaces and can be configured to selectively reflect incident light in at least one wavelength range in the near-infrared spectrum. The peak reflectance, measured substantially in the normal direction of the eye-wearing, can be at least 70%.

[0107] According to various embodiments, the interference coating can have an average reflectivity of less than 5% in the visible light range.

[0108] According to various embodiments, the interference coating may include at least two low-refractive-index layers and at least two high-refractive-index layers, wherein the low-refractive-index layers and high-refractive-index layers are in an alternating order, for example, as a stack of layers. The low-refractive-index layers may be layers of low-refractive-index material. The high-refractive-index layers may be layers of high-refractive-index material. The refractive index of the low-refractive-index layers may be lower than the refractive index of the high-refractive-index layers. Each low-refractive-index layer may have a refractive index lower than 1.60 and each high-refractive-index layer may have a refractive index higher than 1.80.

[0109] According to various embodiments, the stack of layers can be, for example, a quarter-wavelength stack (also referred to herein as a quarter-wavelength interference coating) or an anti-reflection (AR) stack (also referred to herein as an anti-reflection interference coating). Anti-reflection can refer to reducing reflection in at least a portion of the visible spectrum, such as reflection throughout the entire visible spectrum. The stack is optimized to enhance reflection in the near-infrared region.

[0110] According to various embodiments, the ratio of the highest refractive index in the high refractive index layer to the lowest refractive index in the low refractive index layer can be greater than 1.30, for example, greater than 1.40.

[0111] According to various embodiments, the low-refractive-index layer may have a low-refractive-index material composition with a first refractive index and a first thickness, and

[0112] The high refractive index layer may have a high refractive index material composition with a second refractive index different from the first refractive index and a second thickness different from the first thickness.

[0113] According to various embodiments, the interference coating may include alternating low-refractive-index layers and high-refractive-index layers. The optical thickness of each low-refractive-index layer may be equal to one-quarter of the target center reflection wavelength. The optical thickness of each high-refractive-index layer may be equal to one-quarter of the target center reflection wavelength. The interference coating may include an outer high-refractive-index layer that is furthest from the optical substrate among the high-refractive-index layers. The interference coating may further include an outer low-refractive-index layer disposed on the outer high-refractive-index layer, on the side furthest from the optical substrate. This outer low-refractive-index layer may have an optical thickness equal to one-eighth of the target wavelength.

[0114] According to various embodiments, the multilayer interference coating may include at least 8 layers.

[0115] According to various embodiments, the reflectance of the interference coating at 850 nm and / or the reflectance of the interference coating at 940 nm is at least 70%, for example, at least 80%. According to various embodiments, the peak reflectance of the optical filter is at 850 nm + / - 10 nm or 940 nm + / - 10 nm. According to various embodiments, for example, a first coating on a first lens or a first portion of a first lens may have peak reflectance at or within a first wavelength λ1 of + / - 20 nm (e.g., at 850 + / - 10 nm). For example, a second coating on a second lens or a second portion of a first lens may have peak reflectance at or within a second wavelength λ2 of + / - 20 nm (e.g., at 940 + / - 10 nm).

[0116] According to various embodiments, optical filters may have a reflectance value (Rv) equal to or less than 2%, for example equal to or less than 0.5%, for example equal to or less than 0.1%. According to various embodiments, eyewear may have an Rv equal to or less than 2%, for example equal to or less than 0.5%, for example equal to or less than 0.1%.

[0117] According to various embodiments, Rv is described and can be determined by the following equation, where R(λ) is the reflectance at wavelength λ, V(λ) is the eye sensitivity function in CIE 1931, and D65(λ) is the daylight source as defined in standard CIE S005 / E-1998.

[0118]

[0119] The interference coating may be applied to at least one of the front and rear main surfaces and may be configured to selectively reflect incident light I1 in at least one wavelength range in the near-infrared spectrum. The peak reflectance measured in the substantially normal direction of the eyewear may be at least 70%. As used herein and according to various embodiments, the expression "substantially normal" may refer to an angle of less than 15 degrees with respect to the geometric normal of the surface to which light may be incident (e.g., surface 3 of the eyewear) at the point of incidence of light I1.

[0120] According to various embodiments, the optical substrate may include, for example, a transparent material, a transparent mineral glass, or a transparent organic material. The organic substrate may include, for example, a thermosetting or thermoplastic material, such as commercially available materials: Orma, 1.56, MR8, MR7, or polycarbonate. As an alternative to or appended to the transparent material, the optical substrate may include, for example, a substrate for sunglasses, which is composed, for example, of a coloring material. The term "transparent" may refer, for example, to a peak transmittance of at least 85%, optionally at least 95%, at any or all relevant wavelengths in the visible spectrum. In the example, the substrate thickness may be selected from the range of 0.3 mm to 5 mm.

[0121] According to various embodiments, the interference coating may include at least two low-refractive-index layers and at least two high-refractive-index layers, wherein the low-refractive-index layers and high-refractive-index layers are in an alternating order. The low-refractive-index layers may be layers of low-refractive-index material. The high-refractive-index layers may be layers of high-refractive-index material. The refractive index of the low-refractive-index layers may be lower than that of the high-refractive-index layers.

[0122] An exemplary interference coating 22 on the optical substrate 21 Figure 11 The diagram is schematically illustrated. According to various embodiments, the interference coating may include a low-refractive-index layer m1 and a high-refractive-index layer m2 in an alternating sequence, thereby forming a stack. Figure 11The interference coating 22 includes a low-refractive-index layer m1 and a high-refractive-index layer m2, which form a stack 23. Except for the first and last layers of the stack, each low-refractive-index layer m1 may contact two high-refractive-index layers m2, and vice versa. The optical thickness of each low-refractive-index layer m1 may be equal to one-quarter of the wavelength reflected from the target center. The optical thickness of each high-refractive-index layer m2 may be equal to one-quarter of the wavelength reflected from the target center. The interference coating 22 may include an outer high-refractive-index layer m2 that is furthest from the optical substrate 21 within the high-refractive-index layers. The interference coating 22 may further include an outer low-refractive-index layer 24 disposed on the outer high-refractive-index layer, on the side furthest from the optical substrate 21. The outer low-refractive-index layer 24 may have an optical thickness equal to one-eighth of the target wavelength. The outer low-refractive-index layer 24 may be configured, for example, to optically interface the stack 23 with air.

[0123] In some embodiments, the low-refractive-index layer may have a low-refractive-index material composition with a first refractive index and a first thickness, and

[0124] The high refractive index layer may have a high refractive index material composition with a second refractive index different from the first refractive index and a second thickness different from the first thickness. For example, each low refractive index layer may have a low refractive index material composition with a first refractive index and may have a first thickness; each high refractive index layer may have a high refractive index material composition with a second refractive index and may have a second thickness.

[0125] Each low-refractive-index layer may have a refractive index below 1.60 and each high-refractive-index layer may have a refractive index above 1.80. Low-refractive-index layers may include or be formed from: SiO2, SiO2-Al2O3 composites (wherein Al2O3 is less than 20 mol%), MgF2, and mixtures thereof. High-refractive-index layers may include or be formed from: SiN, TiO2, Nb2O5, ZrO2, Ta2O5, Nd2O3, Pr2O3, PrTiO3, La2O3, and mixtures thereof. According to various embodiments, unless otherwise defined, the refractive index of a material refers to its refractive index at a wavelength of 550 nm in vacuum.

[0126] Figure 12 A table showing the layer configuration of the interference coating optimized for 940 nm is presented, with columns from left to right representing: material composition, optical thickness at 940 nm wavelength, and physical thickness in nanometers (nm). Figure 12In the diagram, the interference coating comprises a stack of alternating SiO2 layers (as low-refractive-index layers) and SiN layers (as high-refractive-index layers). Each of the low-refractive-index and high-refractive-index layers has an optical thickness of 0.25 nm. Each low-refractive-index layer has a physical thickness of 162 nm, and each high-refractive-index layer has a physical thickness of 122 nm. The interference coating further comprises an outer low-refractive-index layer of SiO2 with an optical thickness of 0.125 nm and a physical thickness of 81 nm (first row of the table). Figure 12 Also shown are wavelength-dependent reflectance plots of interference coatings with stacks varying from 6 layers (6L), 8 layers, 10 layers, 16 layers, and 24 layers (24L). The number of layers increases from bottom to top. It can be seen that using... Figure 12 An exemplary configuration in which a stack of 10 or more layers provides a peak reflectance of at least 70% that can be measured substantially in the normal direction of the eyewear.

[0127] Figure 13 Another table shows the layer configuration with an interference coating optimized for 850 nm. The columns from left to right represent: material composition, optical thickness at 850 nm wavelength, and physical thickness in nanometers (nm). Figure 13 In the diagram, the interference coating comprises a stack of alternating SiO2 layers (as low-refractive-index layers) and SiN layers (as high-refractive-index layers). Each of the low-refractive-index and high-refractive-index layers has an optical thickness of 0.25 nm. Each low-refractive-index layer has a physical thickness of 110 nm, and each high-refractive-index layer has a physical thickness of 146 nm. The interference coating further comprises an outer low-refractive-index layer of SiO2 with an optical thickness of 0.125 nm and a physical thickness of 73 nm (first row of the table). Figure 13 Also shown are wavelength-dependent reflectance plots of interference coatings with stacks varying from 6 layers (6L), 8 layers, 10 layers, 16 layers, and 24 layers (24L). The number of layers increases from bottom to top. It can be seen that using... Figure 13 An exemplary configuration in which a stack of 10 or more layers provides a peak reflectance of at least 70% that can be measured substantially in the normal direction of the eyewear.

[0128] Figure 12 and Figure 13 The structure and reflection spectrum of a SiN / SiO2 quarter-wavelength reflective filter are shown. It should be noted that the reflectivity of these filters at 940 nm or 850 nm gradually increases with the number of stacked layers, while the average reflectivity in the visible region remains relatively constant, with Rv remaining around 2%. Using approximately 24 layers (12 layers of SiN and 12 layers of SiO2), approximately 100% reflectivity can be achieved at 940 nm or 850 nm. In the example, the first coating can be a combination of... Figure 12 Any coating shown, and the second coating may be a combination. Figure 13 Any coating shown.

[0129] Figure 14 The interference coating 22 as described above is shown, for example, combined with Figure 11 Besides the fact that the thicknesses of the low-refractive-index layers m1 and m2 can be different from each other, the low-refractive-index layers are not necessarily made of the same material, and the high-refractive-index layers are not necessarily made of the same material either. The thickness of the layers can be determined, for example, using the transfer matrix method. Figure 11 An example of interference coating 22 is an anti-reflective (AR) stack, also referred to herein as an anti-reflective interference coating. Figure 11 In the example, the interference coating 22 is shown as a stack 23 comprising six layers; however, this disclosure is not limited thereto. Using optimized layer thicknesses, this stack 23 can achieve a higher bonding density than the previous method. Figure 12 and Figure 13 The previous example explained uses fewer layers to achieve a peak reflectivity of at least 70%.

[0130] According to various embodiments, the ratio of the highest refractive index in the high refractive index layer to the lowest refractive index in the low refractive index layer can be greater than 1.30, for example, greater than 1.40.

[0131] For a stack composed of two materials, the refractive index ratio can be defined as the ratio of the refractive index of m2 to the refractive index of m1. The two materials can refer to all low-refractive-index material layers having the same material composition and all high-refractive-index material layers having the same material composition. For a stack composed of three or more materials, the refractive index ratio can be defined as the ratio of the highest refractive index to the lowest refractive index. For example, in an 8-layer AR stack composed of SiO2, ZrO2, and TiO2 layers, the refractive index ratio is defined as the ratio of the refractive index of TiO2 to the refractive index of SiO2.

[0132] Figure 15 (a) A table showing the material composition and layer thickness (in nm) of an interference coating according to various embodiments is provided. The interference coating comprises alternating layers of low-refractive-index SiO2 and high-refractive-index TiO2 on a substrate. The layer thickness is optimized for 850 nm. Figure 10 (b) shows the reflectance spectrum of the interference coating, which shows that the peak reflectance measured in the essentially normal direction of the eye-wearing material is greater than 70%. Figure 15 The table in (c) shows the parameters extracted from the reflectance spectrum, in which the reflectance is 76.5% at 850 nm and 72.7% at 940 nm. For most of the visible spectrum, the reflectance is close to 0% (less than 5%).

[0133] While various embodiments describe the determination of angles, such as yaw, pitch, or roll, it is also contemplated that the existence of an angular deviation is determined without necessarily determining the exact angle. Therefore, in some embodiments, the corresponding angle may indicate the deviation, but does not necessarily need to indicate the exact angle.

[0134] This disclosure relates to an eyewear garment that includes at least a first coating having reflective properties in the invisible wavelength range, and further includes, for example, a frame for holding lenses, the frame including the first coating. The frame may further include a second coating. The first and second coatings may have different reflectance spectra. Each of the first and second coatings may have a different reflectance spectral region.

[0135] According to some embodiments, an eyewear garment may include a frame, such as an eyeglass frame. The frame of the eyewear garment may include a first coating at a first location and a second coating at a second location, these coatings being different from each other. A first signal may be reflected by the first coating, and a second signal may be reflected by the second coating. The first and second locations may be non-lens portions of the frame. Each of the first and second coatings may include, for example, a patterned pattern. The posture of the eyewear garment can be determined by detecting light signals from non-electronic portions of the frame. The frame may be electronically passive (i.e., not electronically powered).

[0136] According to some embodiments, an eyewear garment may include a frame, such as an eyeglass frame. The frame of the eyewear garment may include a first coating at a first location and / or a second coating at a second location, and these coatings may be different from each other. The first and / or second coatings may be in the form of a pattern, for example, spaced-apart coated portions, such as circles, polygons with more than four sides, squares, ellipses, or other suitable shapes. For example, the pattern may be that the coated portions are arranged in rows and columns, such as rows substantially perpendicular to the columns. The pattern can be used to detect the orientation of pattern features (e.g., rows or columns) relative to a sensor (e.g., a near-infrared camera). The posture of the eyewear garment can be determined by detecting light signals from non-electronic portions of the frame. The frame may be electronically passive (i.e., not electronically powered).

[0137] The light sensor requires only a small amount of coating to record a sufficient amount of light signal reflected by the first and / or second coating. The user may be virtually unable to distinguish the first and / or second coating from the rest of the frame. Therefore, it does not affect the aesthetics of the frame. The first and / or second coating can be any material capable of reflecting NIR and can be integrated into the frame using various methods, such as the coatings previously defined.

[0138] According to some embodiments, the first coating and / or the second coating may be a reflective film, such as safety tape. The reflective film may be integrated into the eyeglass frame, for example, by an adhesive. In an exemplary embodiment, the reflective film is adhered to the eyeglass frame, and the performance of the eyeglass frame is compared with a contrast frame that does not have a reflective film but is otherwise identical to the eyeglass frame. Figure 16 The graphs compared the reflection levels between two test frames at different distances from 160 mm to 400 mm using a photodetector that returned counts per second. Clearly, as shown at data point 1610, the frame with the coating according to the embodiment gave a significantly higher reflection count than the comparative example at data point 1620, i.e., 2 MCPS to 15 MCPS (MCPS = millions of counts per second), while the comparative example only resulted in 0.5 MCPS to 2 MCPS.

[0139] In another embodiment, the first and / or second coating may be a plastic film coated with an AR coating configured to reflect light signals. An example of such an AR coating has, for example... Figure 17 The reflectivity is shown. The AR coating can be deposited directly onto the eyeglass frame. Alternatively, the AR coating can be deposited on a plastic film before being attached to the frame. The plastic film can be trimmed to the desired size before being attached to the frame.

Claims

1. A method for determining the posture of an eyewear garment, the eyewear garment comprising a first lens, the first lens comprising a first coating, the first coating being reflective in an invisible wavelength range and comprising an oriented pattern, the method comprising: The optical signal is detected using a digital device, the digital device including a light sensor for the invisible wavelength range; as well as The posture of the eyewear is calculated using the light signal. Wherein, the optical signal is a signal within the invisible wavelength range reflected from the first coating when the eye-wearing device is within the sensor range, and The posture is at least one of the following: yaw angle, pitch angle, and roll angle. The optical signal includes a first signal and a second signal. The eye-wearing device is configured to reflect light from the first signal and the second signal. Wherein, the first signal is reflected by the first coating at a first position on the eyewear, and the second signal is reflected by the second coating at a second position on the eyewear. The method includes determining: The yaw angle includes: determining a first relative distance between the eyewear and the sensor using the first signal, determining a second relative distance between the eyewear and the sensor using the second signal, and calculating the yaw angle using the first relative distance and the second relative distance; or - The pitch angle, which includes: determining a deviation from a first maximum signal strength using the first signal, and calculating the pitch angle using the deviation; or The roll angle includes: determining a first deviation from a first maximum signal strength using the first signal, determining a second deviation from a second maximum signal strength using the second signal, and calculating the roll angle using the first deviation and the second deviation.

2. The method of claim 1, further comprising: Determine the reference coordinates of the digital device; as well as The reference coordinates are used to calculate the posture of the eyewear.

3. The method as described in claim 1, wherein, The first signal has a first wavelength and the second signal has a second wavelength different from the first wavelength.

4. The method of claim 1, wherein, Detecting the light signal includes capturing an image of the pattern of the eyewear, and calculating the pose of the eyewear includes: Determine the deviation between the captured image and the predetermined pattern; and The attitude is calculated using the deviation.

5. The method of claim 4, wherein, The attitude includes the tilt angle, and wherein determining the deviation includes identifying the orientation of the pattern; and Calculating the tilt angle includes using the predetermined pattern as a reference to calculate the angle difference of the orientation.

6. The method of claim 4, wherein, Determining the deviation includes identifying a first dimension and a second dimension of the pattern, wherein the first dimension and the second dimension intersect, and wherein the attitude includes one or both of the pitch angle and the yaw angle, and calculating one or both of the pitch angle and the yaw angle includes calculating the difference between the first dimension and / or the second dimension and the predetermined pattern.

7. The method of claim 1, wherein, The optical sensor is selected from at least one of the following: an infrared camera, an infrared time-of-flight sensor, or a non-imaging infrared sensor.

8. An eyepiece for performing the method of any one of claims 1 to 7, the eyepiece comprising at least a first coating having a reflective effect in the invisible wavelength range, and further comprising a first lens comprising the first coating, wherein, The first coating includes an oriented pattern.

9. The eye-wearing device as claimed in claim 8, wherein, The eyepiece further includes a second lens, and the second lens has a second coating that includes the same pattern as the first coating of the first lens.

10. A computer program product comprising instructions that, when executed by a digital device, cause the digital device to perform the method as described in any one of claims 1 to 7.

11. The computer program product of claim 10, wherein, The instructions further include: Determine the difference between the stated attitude and a predetermined attitude reference, and When the difference exceeds a predetermined threshold, a user alert is triggered.

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