Glasses for outputting audio information

Abstract

The invention relates to glasses (1) for outputting audio information, having a glasses frame (2) that has two temple arms (3, 4), having at least one loudspeaker unit (5) for generating audible sound and ultrasound, having at least one microphone unit (6) for detecting at least ultrasound and having at least one control unit (7) that can determine wearing of the glasses (1) by a person on the basis of the generated and the detected ultrasound. Furthermore, the at least one loudspeaker unit (5) is arranged on one of the two temple arms (3, 4) and the at least one microphone unit (6) is arranged on the other temple arm (3, 4), and the at least one loudspeaker unit (5) is designed, arranged and / or configured in such a way that it has isotropic acoustic emission behaviour (18) of the ultrasound at least within an emission cone (23).

Description

[0001] 1 UST-12371-25

[0002] 10.03.2026 Glasses for displaying audio information

[0003] The present invention relates to glasses for outputting audio information, comprising a spectacle frame, at least one loudspeaker unit for generating audible sound and ultrasound, at least one microphone unit for detecting at least ultrasound, and at least one control unit.

[0004] The object of the present invention is to reliably determine whether the glasses are being worn by a person.

[0005] The problem is solved by a pair of glasses and / or a method with the features of the independent claims. Advantageous or preferred embodiments are each the subject of a corresponding dependent claim.

[0006] The proposal is for glasses that output audio information via a spectacle frame. With the help of these glasses, a person could, for example, listen to music or make phone calls.

[0007] Furthermore, the glasses include at least one speaker unit. This speaker unit can generate sound. In particular, it can produce audible sound and ultrasound.

[0008] Furthermore, the glasses include at least one microphone unit. This microphone unit can detect sound, specifically ultrasound. Consequently, the ultrasound generated by the speaker unit can be detected to determine whether a person is wearing the glasses. 2 UST-12371-25

[0009] March 10, 2026

[0010] Furthermore, the glasses include at least one control unit. This control unit can detect whether a person is wearing the glasses based on the generated and received ultrasound signals. This is achieved by exploiting the fact that ultrasound signals change when a human head is nearby. This difference in the emitted and received ultrasound signals can be analyzed to determine whether the glasses are being worn.

[0011] Furthermore, the glasses or the frame comprise two temples. At least one loudspeaker unit is located on one of the temples. At least one microphone unit is located on the other temple. This means that the microphone unit is located on the temple opposite the loudspeaker unit. When the glasses are worn, the person's head is positioned between the loudspeaker unit and the microphone unit. The ultrasound is thus attenuated by the person's head and then reaches the microphone unit. Based on the change in the ultrasound from attenuation to complete blockage, the control unit can determine that the head is positioned between the temples. The control unit can therefore detect the changes in the ultrasound caused by the person's head, specifically the attenuation or blockage.The system detects whether the glasses are being worn by completely blocked ultrasound waves. When the waves are completely blocked, no ultrasound waves reach the microphone unit, which also indicates that the head is positioned between the speaker and microphone units. When the waves are attenuated, the microphone unit still detects ultrasound waves, but these are weaker compared to the generated ultrasound waves, thus confirming that the head is positioned between the speaker and microphone units.

[0012] The at least one loudspeaker unit is preferably designed, arranged and / or configured such that it exhibits an isotropic acoustic radiation pattern of the ultrasound at least within one radiation cone.3 UST-12371-25

[0013] March 10, 2026

[0014] The at least one loudspeaker unit is preferably designed, arranged, and / or configured such that it exhibits an isotropic acoustic radiation pattern of the ultrasound within at least one solid angle. This enables reliable detection of the wearer's status, allowing, for example, audio output to be automatically interrupted when the glasses are not being worn. A solid angle and / or the radiation cone describes a three-dimensional angular range in space within which sound waves propagate. Isotropic radiation means that the ultrasound is emitted uniformly in all directions within this solid angle and / or radiation cone. This ensures that the wearer's status is detected regardless of the specific orientation of the glasses. This results in increased robustness of the wearer's detection in practical applications.The radiation pattern can also be described using a radiation angle and / or the radiation cone. Isotropic radiation can be such that the sound intensity within the solid angle and / or the radiation cone or radiation angle lies above a certain threshold. Here, the radiation angle and / or the radiation cone can be defined as the angular range in which the sound intensity decreases by no more than 6 decibels compared to the maximum value. This -6 dB radiation angle and / or radiation cone represents the range in which isotropic and / or uniform sound radiation occurs. Uniform in this context means that the ultrasound intensity within the radiation cone lies between -6 dB and 0 dB. 0 dB is the maximum intensity, which is usually located at a center line.

[0015] At least one loudspeaker unit thus exhibits an isotropic radiation pattern in the solid angle and / or radiation cone where the intensity of the generated ultrasound falls less than 6 dB below the maximum value.4 UST-12371-25

[0016] March 10, 2026

[0017] Isotropic radiation behavior exists when, within such a solid angle - for example, of at least 2 TT steradians - the sound intensity remains largely constant, in particular remaining above -6 dB relative to a maximum intensity.

[0018] Advantageously, at least one loudspeaker unit is designed, arranged, and / or configured such that the solid angle of the isotropic acoustic radiation pattern of the ultrasound is at least 2 TT sr. A solid angle of at least 2 TT steradians corresponds to at least half a sphere and thus enables uniform sound radiation downwards or to the side. Within this solid angle, the intensity of the generated ultrasound is at least -6 dB of the maximum intensity. This ensures that reliable detection remains possible even if the glasses are worn in a different position on the head.

[0019] It is advantageous if at least one loudspeaker unit is designed, arranged, and / or configured such that the radiation cone of the generated ultrasound is shaped in such a way that at least one microphone unit is located within the radiation cone of the loudspeaker unit. A radiation cone describes the geometric shape of sound propagation, which typically extends conically from the sound source into the room. If the microphone unit is located within the radiation cone, a direct acoustic connection is established between the loudspeaker and the microphone. This enables reliable detection of the emitted ultrasound and improves the accuracy of wearer detection.

[0020] It is advantageous if the at least one loudspeaker unit is designed, arranged, and / or configured such that the radiation cone of the isotropic acoustic radiation behavior of the ultrasound has an opening angle greater than 60°, in particular greater than 70°, in particular greater than 80°, and in particular greater than 90°. The opening angle describes the angular width of the radiation cone within which the sound intensity is greater than 5 UST-12371-25

[0021] March 10, 2026

[0022] Compared to the maximum value, the intensity drops by only a certain amount – typically 6 decibels. A wide beam angle means that the ultrasound is emitted over a broad range with nearly constant intensity, particularly between -6 dB and 0 dB. This increases the independence of wear detection from the exact alignment of the glasses on the wearer's head.

[0023] Advantageously, at least one loudspeaker unit is designed, arranged, and / or configured such that the radiation cone of the isotropic acoustic radiation pattern of the ultrasound has a solid angle of at least 2 TT sr. A solid angle of 2 TT steradians corresponds to half a sphere and thus describes uniform radiation over a hemispherical surface. This allows for the reliable detection of reflected or head-influenced ultrasound in a wide variety of possible wearing situations. This improves the robustness of the wearer detection system, independent of the exact head position.

[0024] Furthermore, it is advantageous if at least one loudspeaker unit is designed, arranged, and / or configured such that the radiation cone of the isotropic acoustic radiation pattern of the ultrasound is at least hemispherical. A hemispherical radiation cone means that the ultrasound is emitted with approximately the same intensity throughout an entire half-space. This is particularly advantageous for wearable devices such as eyeglasses, as it ensures that the ultrasound travels in the direction of the microphone path regardless of head position.

[0025] In particular, the isotropic acoustic radiation pattern is such that the intensity is between -6 dB and 0 dB.

[0026] In an advantageous embodiment of the invention, the at least one loudspeaker unit is designed, arranged and / or configured such that the solid angle of the ultrasound radiation pattern is at least 6 UST-12371-25

[0027] March 10, 2026

[0028] The glasses are hemispherical. A hemispherical solid angle covers a wide area around the speaker unit, thus increasing flexibility in positioning the microphone unit. This allows for a more variable geometric design of the glasses without compromising functionality. Furthermore, the glasses can still be detected even if they are not worn as intended, for example, if they are positioned differently.

[0029] It is advantageous if at least one loudspeaker unit is designed, arranged, and / or configured such that, when the glasses are worn, one of its openings is directed towards the wearer's ear. The sound generated by the loudspeaker unit is emitted into the surroundings through this opening. By directing this opening towards the ear, the audible sound is focused on the wearer. This improves the acoustic coupling between the loudspeaker unit and the ear, resulting in more efficient sound transmission. At the same time, it reduces sound radiation into the environment, thereby increasing privacy and minimizing disturbance to bystanders.

[0030] Furthermore, at least one loudspeaker unit can be designed, arranged and / or configured in such a way that the radiation direction of the audible sound and / or ultrasound is directed towards the person's ear when the glasses are worn as intended.

[0031] It is advantageous if at least one speaker unit includes a broadband speaker capable of generating both audible sound and ultrasound for detecting wear. A broadband speaker can produce both audible and ultrasound-based frequency ranges. This reduces the number of components and simplifies the integration of the audio and wear detection functions into a single element. It also reduces weight and energy consumption.7 UST-12371-25

[0032] March 10, 2026

[0033] In particular, the loudspeaker unit includes a MEMS broadband loudspeaker. MEMS stands for micro-electro-mechanical system and refers to microscopically small components with mechanical and electrical functions. The use of a MEMS loudspeaker allows the loudspeaker unit to be made particularly compact and lightweight.

[0034] Furthermore, it is advantageous if at least one loudspeaker unit comprises at least two loudspeakers. One loudspeaker can produce audible sound. A second loudspeaker can generate ultrasound. By dividing the sound between two specialized loudspeakers, optimized playback quality can be achieved in the respective frequency ranges.

[0035] It is advantageous if at least one of the two speakers is a MEMS speaker. This allows for the use of space-saving and energy-efficient components, which is particularly beneficial for portable devices such as eyeglasses.

[0036] It is advantageous if at least one loudspeaker unit can generate sound with a frequency up to, and especially at least, 80 kHz. Frequencies up to 80 kilohertz are significantly above the human hearing range and allow for more precise detection of the glasses being worn due to reduced interference.

[0037] Furthermore, it is advantageous if the glasses and / or the control unit include a pulse generator. The pulse generator can produce ultrasound pulses to detect when the glasses are being worn. The ultrasound pulse output allows for time-differentiated evaluation and improves signal processing during wear detection. In addition, this can reduce energy consumption through intermittent signal transmission.8 UST-12371-25

[0038] March 10, 2026

[0039] It is advantageous if the glasses have two temples. At least one speaker unit is located on one temple, and at least one microphone unit is located on the other. This placement on opposite sides creates an acoustic path through the head, causing characteristic changes in the ultrasound signal. This significantly improves the detection of the wearer's condition.

[0040] Advantageously, at least one speaker unit and / or at least one microphone unit are located on the underside of the temples. This underside provides a direct acoustic path to the head and reduces obstructions caused by hair or parts of the glasses. This results in more stable signal transmission and increased detection accuracy.

[0041] In an advantageous embodiment of the invention, the glasses include a modulator. This modulator allows for the modulation of electrical signals corresponding to ultrasound and audible sound. The modulation enables the superposition of multiple signals and their simultaneous transmission via the at least one loudspeaker unit. This saves space and reduces the complexity of the circuit.

[0042] It is advantageous if at least one microphone unit includes an ultrasonic microphone. Additionally or alternatively, at least one microphone unit is designed as an ultrasonic microphone. A microphone specifically sensitive to ultrasound enables precise detection of reflected or head-modified ultrasonic waves.

[0043] It is advantageous if the glasses include a detection unit. This detection unit can recognize whether one or both temples are open and / or folded.9 UST-12371-25

[0044] March 10, 2026

[0045] This serves the purpose of capturing alternative or supplementary information about the wearer's condition. The combination of acoustic and mechanical detection increases reliability.

[0046] In an advantageous embodiment of the invention, the detection unit comprises at least two contact elements. These are arranged in the area of ​​at least one folding section of the spectacle temples. The contact elements enable simple electrical detection of the folded state of the spectacle temples. For example, a circuit can be closed using the two contact elements, so that the folding of the spectacle temples can be detected. Additionally or alternatively, the detection unit can also include, for example, a switch that is activated by the folding of a spectacle temple. This can provide the control unit with additional information about whether the spectacles are being put on or taken off. Furthermore, by detecting whether the spectacle temples are folded, the emission of at least the ultrasound for detecting the wearing status can be deactivated.When the temples are folded, the glasses are not being worn, so there is no need to detect whether they are being worn using ultrasound. This saves energy. However, when the temples are opened again, the ultrasound can be generated to detect that the glasses are being worn.

[0047] A method is proposed for determining whether a person is wearing glasses. The glasses are designed according to one or more features of the preceding and / or following description, whereby the mentioned features may be present individually or in any combination.

[0048] At least one loudspeaker unit generates ultrasound. The targeted emission of ultrasound waves provides the basis for drawing conclusions about the wearing status of the glasses based on sound propagation. 10 UST-12371-25

[0049] March 10, 2026

[0050] At least one microphone unit detects ultrasound. This unit registers changes in the received ultrasound caused by the wearer's head. This enables contactless and invisible / inaudible wear detection.

[0051] The control unit determines whether the person is wearing glasses based on the generated and detected ultrasound.

[0052] Additionally, ultrasound is generated by means of at least one loudspeaker unit, preferably with an isotropic acoustic radiation pattern in at least one solid angle. An isotropic radiation pattern means that the ultrasound is emitted uniformly in all directions within a specific solid angle. This ensures that detection is independent of the orientation of the glasses. The isotropic radiation pattern has already been described above. The isotropic radiation pattern can mean that the intensity of the generated ultrasound in the solid angle is greater than -6 dB of the maximum intensity. The ultrasound can thus have an isotropic radiation angle. In this case, the intensity is isotropic, i.e., greater than -6 dB of the maximum intensity across the solid angle. The solid angle can be at least 2 TT steradians.In this solid angle, the intensity is greater than -6 dB of the maximum intensity, which can be described as isotropic.

[0053] It is advantageous if audible sound is generated. The audible sound serves the audio function of the glasses, for example for music playback or voice communication.

[0054] Furthermore, it is advantageous if the generation of audible sound is deactivated when determining whether a person is wearing glasses.11 UST-12371-25

[0055] March 10, 2026

[0056] This prevents audio content from being unintentionally broadcast into the surroundings, thus protecting the privacy of the wearer. Furthermore, energy consumption is reduced when the glasses are not being worn.

[0057] Furthermore, it is advantageous if the system activates the audible sound when the person is detected wearing glasses. This allows for automatic activation of the audio function, which increases ease of use.

[0058] It is advantageous if the control unit compares the generated and detected sound waves. This comparison allows it to determine whether the received ultrasound corresponds to the emitted sound or has been altered by interaction with the head. This forms the basis for reliable wearer detection.

[0059] In an advantageous embodiment of the invention, corresponding electrical signals are modulated together to generate audible sound and ultrasound. This is achieved, in particular, by means of a modulator. The modulation allows the simultaneous generation of different acoustic signals with only one loudspeaker unit. This leads to a reduction in installation space and a simplification of the electronics.

[0060] It is advantageous if the ultrasound is generated with a measurement frequency of up to 80 kHz, particularly up to 70 kHz, particularly up to 60 kHz, particularly up to 50 kHz, and particularly up to 40 kHz. A high measurement frequency enables fine resolution and a short wavelength, resulting in more accurate detection. At the same time, the frequency is outside the range of human hearing, so no acoustic disturbance occurs.

[0061] As a supplement or alternative, it is advantageous if the recognition unit can detect whether one or both of the spectacle arms are worn.12 UST-12371-25

[0062] March 10, 2026

[0063] The temples of the glasses are open and / or folded. This additional information can be used to confirm or supplement the acoustic wear detection.

[0064] Alternatively or additionally, it offers advantages to deactivate the generation and / or detection of ultrasound for detecting whether the glasses are being worn and / or the audible sound when it is detected that at least one of the two temples is folded. This avoids unnecessary signal processing and energy consumption when the glasses are obviously not being worn.

[0065] Additionally or alternatively, it is advantageous if the generation and / or detection of ultrasound for the detection of wearing glasses and / or audible sound is activated when it is detected that both temples of the glasses are open. This allows the systems to start up automatically when the glasses are opened, thus increasing user-friendliness.

[0066] It is advantageous if the ultrasound used to detect the wearing of glasses is generated in pulses. Pulsed generation allows for a temporally structured measurement and reduces the duration of energy consumption.

[0067] Furthermore, it is advantageous if the ultrasound pulses for detecting eyeglass wear are generated at intervals of 100 ms, 500 ms, 1 s, 5 s, or 15 s. Such intervals allow the wear detection to be adapted to different energy and accuracy requirements.

[0068] It is advantageous if the ultrasound used to detect eyeglass wear is generated at a specific measurement frequency. The microphone unit exhibits maximum sensitivity in the ultrasound range. Maximum sensitivity in the target frequency range increases detection accuracy and improves the signal-to-noise ratio. Furthermore, this allows the intensity of the generated ultrasound to be reduced, thus saving energy. 13 UST-12371-25

[0069] March 10, 2026

[0070] The measurement frequency generated by at least one loudspeaker unit can be 30 kHz, 40 kHz, 50 kHz, 60 kHz, 70 kHz or 80 kHz.

[0071] In an advantageous embodiment of the invention, the ultrasound is generated at the measurement frequency within a frequency range. This range lies 5 kHz around the frequency of the microphone unit's maximum sensitivity. By generating the signal close to the microphone unit's optimal sensitivity frequency, signal quality is maximized. Furthermore, this allows the intensity of the generated ultrasound to be reduced, since the microphone unit is most sensitive in this frequency range, thus saving energy. This results in increased accuracy and reliability in detecting the wearer's condition.

[0072] Further advantages of the invention are described in the following exemplary embodiments. These show:

[0073] Figure 1 shows a perspective view of glasses in a folded state.

[0074] Figure 2 shows a perspective view of glasses in the open state.

[0075] Figure 3 shows a side view of the glasses from the right, specifically of the first temple and at least one speaker unit with control unit.

[0076] Figure 4 shows a side view of the glasses from the left, specifically of the second temple and at least one microphone unit.

[0077] Figure 5 shows a side view of the glasses from the right, or of the first temple, showing at least one loudspeaker unit with control unit, modulator and pulse generator and 14 UST-12371-25

[0078] March 10, 2026

[0079] Figure 6 shows a diagram of the radiation pattern of at least one loudspeaker unit.

[0080] Figure 1 shows a pair of glasses 1 for outputting audio information in a perspective view in the folded state.

[0081] The glasses 1 shown here comprise a first temple 3. Additionally, the glasses 1 have a second temple 4. The second temple 4 is arranged in Figure 1 such that it is placed over the first temple 3, resulting in the glasses 1 being in a folded configuration as shown.

[0082] As shown in the embodiment of Figure 1, a detection unit 10 is arranged in the area of ​​the eyeglass frame 2. The detection unit 10 is suitable for detecting the state of the temples 3, 4, in particular whether they are open or folded. This enables automatic control of other functions of the eyeglasses 1, for example, activating or deactivating the audio output depending on the wearing status of the eyeglasses 1. Furthermore, the wearing status of the eyeglasses 1 can be detected. If the eyeglasses 1 are folded, as shown here, they are not being worn. Consequently, the detection using ultrasound can also be deactivated, a method which is explained in more detail below. Deactivating the detection of the wearing status of the eyeglasses 1 can save energy. When the eyeglasses 1 are opened again, the detection of the wearing status of the eyeglasses 1 using ultrasound can be reactivated.

[0083] In this embodiment, the detection unit 10 has a first contact element 11 and a second contact element 12. Both contact elements 11 and 12 are arranged on the second temple 4 of the glasses. A circuit can be closed using the contact elements 11 and 12. 15 UST-12371-25

[0084] March 10, 2026

[0085] to be able to determine whether the temples 3, 4 are open or folded.

[0086] The detected position of the temples 3, 4 can be transmitted by the detection unit 10 to a control unit 7 of the glasses 1, which is described below. This allows, for example, the generation and / or detection of ultrasound and audible sound to be deactivated when it is detected that at least one of the temples 3, 4 is folded. This improves the energy efficiency of the glasses 1 and prevents unwanted audio output when not being worn.

[0087] Figure 2 shows a pair of glasses 1 in a perspective view in the open state. The embodiment shown in Figure 2 depicts the glasses 1 with the temples 3, 4 fully extended in a typical wearing configuration.

[0088] As can be seen from the embodiment shown in Figure 2, the temples 3, 4 are in a state that allows the glasses 1 to be used by a person. This can be detected by a detection unit 10 of Figure 1, which allows system functions such as audio output or wear detection via ultrasound to be activated.

[0089] Figure 3 shows a side view of the glasses 1 from the right, showing in particular the first temple 3, the speaker unit 5, the control unit 7, the modulator 14 and the pulse generator 15. The view is from the right, looking at the first temple 3.

[0090] At least one speaker unit 5 is arranged on the first temple 3 of the glasses. The speaker unit 5 serves to generate acoustic sound, and can produce both audible sound and ultrasound. The speaker unit 5 enables audio output to the user of the glasses 1 and simultaneously serves for wearer detection by means of 16 UST-12371-25

[0091] March 10, 2026

[0092] Ultrasound signal. This audible sound can be used, for example, to play music or make phone calls. Ultrasound can also be used to determine whether a person is wearing glasses 1 or not. Ultrasound is suitable for this purpose because it is inaudible to the wearer.

[0093] Both the first temple 3 and the second temple 4 have an underside 13. In the illustrated embodiment, the loudspeaker unit 5 is arranged on the underside 13. This arrangement on the underside 13 is advantageous because it allows the generated sound 8 to be directed towards the head of the wearer. This improves signal transmission to the ear and the detection of the ultrasound components influenced by the head.

[0094] Furthermore, the at least one loudspeaker unit 5 is arranged, configured, and / or designed such that an outlet opening 24 of the loudspeaker unit 5 is directed towards one of the person's ears when the glasses 1 are worn as intended. Additionally, a radiation direction 25 is directed towards the ear when the glasses 1 are worn as intended. This ensures that the audible sound reaches the ear directly. The position of the at least one loudspeaker unit 5 in relation to the ear is determined, for example, by the angled rear section of the temples 3, 4.

[0095] As shown in Figure 3, the glasses 1 include a control unit 7. The control unit 7 can advantageously be housed inside the first temple 3 and is functionally coupled to the speaker unit 5. The control unit 7 is designed and / or configured such that it can detect whether a person is wearing the glasses 1 based on the ultrasound generated by the speaker unit 5 and detected by a microphone unit 6. This enables automatic activation and / or deactivation of the audio functions.17 UST-12371-25

[0096] March 10, 2026

[0097] Additionally, the glasses 1 feature a modulator 14. Using the modulator 14, electrical signals for audible sound and ultrasound can be modulated together. This allows simultaneous transmission of both signal types via at least one loudspeaker unit 5, which saves space and simplifies the design. As a result, audible sound and ultrasound are generated simultaneously by at least one loudspeaker unit 5.

[0098] Furthermore, a pulse generator 15 is shown. Pulses of ultrasound can be generated using the pulse generator 15. The generation of pulsed ultrasound enables energy-efficient wear detection of the glasses 1. This reduces the duration of active ultrasound emission and thus saves energy.

[0099] Furthermore, Figure 3 shows the generated sound 8 emanating from the loudspeaker unit 5. The generated sound 8 can be used for both audio output and wear detection. The generated sound 8 can therefore include audible sound and ultrasound.

[0100] The generated sound 8 can furthermore have a radiation angle corresponding to a solid angle greater than 2 TT steradians. Within this radiation angle, at least the generated ultrasound has an intensity of more than -6 dB relative to the maximum intensity of the generated ultrasound. The radiation angle is thus at least hemispherical or greater. Furthermore, the at least one loudspeaker unit 5 can also exhibit isotropic acoustic radiation behavior. This means that the intensity of the generated sound within a solid angle of at least 2 TT steradians is between -6 dB and 0 dB. This allows the ultrasound to be radiated with the same intensity within these limits in different directions according to the solid angle of at least 2 TT steradians. This has an advantage over the radiation behavior of a loudspeaker that is strongly concentrated in one direction. In that case, determining the 18 UST-12371-25

[0101] March 10, 2026

[0102] Wearing of glasses 1 is disrupted or unreliable if glasses 1 are not worn in their correct orientation.

[0103] Figure 4 shows a side view of the glasses 1 from the left, in particular showing the second temple 4 with a microphone unit 6.

[0104] The embodiment shown in Figure 4 comprises the glasses 1 with a frame 2 to which two temples are hinged.

[0105] As can be seen from the embodiment shown in Figure 4, a second temple 4 is hinged to the frame 2. The second temple 4 is shown in a fully open position, so that it is aligned with the wearing position of the glasses 1.

[0106] As shown in Figure 4, a microphone unit 6 is arranged on the second temple 4 of the glasses. The microphone unit 6 is designed to detect ultrasound signals, in particular to record the sound generated by the loudspeaker unit and influenced by the head of the wearer.

[0107] The microphone unit 6 is located on the underside 13 of the second temple 4 of the glasses. This placement on the underside 13 offers the advantage of positioning the microphone unit 6 as close as possible to the surface of the wearer's head. This allows for particularly sensitive detection of reflected or scattered ultrasound 9, thus improving the accuracy of wearer detection.

[0108] Figure 4 shows the incoming sound 9 acting on the microphone unit 6. The incoming sound 9 includes, in particular, reflected components of the ultrasound previously emitted by the loudspeaker unit and contains information about the head shape or the presence of a wearer. The detection of this signal 9 by the microphone unit 6 enables a reliable determination of whether the glasses 1 are being worn.19 UST-12371-25

[0109] March 10, 2026

[0110] The illustrated embodiment according to Figure 4 demonstrates the targeted functional arrangement of the microphone unit 6 on the second temple 4 of the glasses and its coupling to the direction of propagation of the incoming sound 9. This advantageously supports wearer detection by evaluating acoustic travel times or signal changes.

[0111] The wearing of the glasses 1 by the person is detected by the change or attenuation of the ultrasound reaching at least one microphone unit 6 when the person's head is positioned between the loudspeaker unit 5 and the microphone unit 6. The control unit 7 can detect this change or attenuation between the generated ultrasound 8 and the arriving ultrasound 9 and thus infer that the glasses 1 are being worn.

[0112] The at least one microphone unit 6 is connected to the control unit 7, as is the at least one loudspeaker unit 5 according to Figure 3.

[0113] Figure 5 shows a side view of the glasses 1 from the right, looking at the first temple 3 with the speaker unit 5.

[0114] The loudspeaker unit 5 is arranged on the first temple 3 of the glasses. In this embodiment, the loudspeaker unit 5 comprises two loudspeakers 16, 17, namely a first loudspeaker 16 and a second loudspeaker 17. The first loudspeaker 16 is designed to generate audible sound. The second loudspeaker 17 is used to generate ultrasound, which is used for wearer detection. The separation into two specialized loudspeakers 16, 17 allows for frequency-optimized reproduction, thereby achieving better signal quality in both frequency ranges. 20 UST-12371-25

[0115] March 10, 2026

[0116] The two loudspeakers 16 and 17 are arranged together on the underside 13 of the first temple 3 of the glasses, as shown in Figure 5. This arrangement enables targeted acoustic radiation towards the head of the wearer and leads to increased acoustic efficiency as well as improved wearer detection accuracy.

[0117] The sound 8 generated by the loudspeaker unit 5 is shown schematically in Figure 5. The sound 8 can be modified by reflection or diffraction at the user's head. These modifications are detected by a microphone unit 6.

[0118] The exit opening 24 and / or the radiation direction 25, not shown here, are again directed towards the ear when the glasses 1 are worn by the person. It is important that at least the loudspeaker 16, 17, which generates the audible sound, is directed towards the ear when the glasses 1 are worn as intended. Both loudspeakers 16, 17 also each have an exit opening 24 and / or a radiation direction 25.

[0119] Figure 6 shows a diagram of the radiation behavior 18 of the loudspeaker unit 5 at an exemplary frequency of 40 kHz, shown in a hemispherical projection over a solid angle 19, indicating a radiation cone 23 which has an isotropic acoustic radiation behavior.

[0120] The embodiment shown in Figure 6 illustrates the radiation pattern 18 of the loudspeaker unit 5 in the ultrasonic range. The radiation pattern 18 describes the distribution of the acoustic sound pressure level 21 as a function of the direction of sound emission. In the figure shown, it is represented in a polar circular diagram by a solid angle 19, which here depicts a hemispherical radiation pattern. The solid angle 19 corresponds in this case to 2TT steradian.21 UST-12371-25

[0121] March 10, 2026

[0122] The center line 20 in Figure 6 marks the main radiation direction of the loudspeaker unit 5, i.e., the direction in which the highest sound pressure is generated (0° axis). Radiation directions from -90° to +90° are shown around this center line 20, thus completely representing the radiation in the vertical plane.

[0123] Figure 6 shows concentric circles representing different levels of sound pressure 21. The scale ranges from 0 dB at the outer edge to -30 dB in the center. The 0 dB value corresponds to the maximum sound pressure level achieved along the center line 20. The sound pressure curve 22 represents the actual measurement or simulation of the radiation pattern 18 of the loudspeaker unit 5 at 40 kHz.

[0124] As can be seen from the embodiment shown in Figure 6, the radiation pattern 18 in the illustrated area is approximately circular. Within the radiation cone 23, with an opening angle greater than 60°, the intensity remains in a range between 0 dB and -6 dB. Advantageously, the opening angle with the intensity between 0 dB and -6 dB is greater than 70°, particularly greater than 80°, and in the illustrated embodiment greater than 90°.

[0125] This area is characterized in Figure 6 by the radiation cone 23. The radiation cone 23 describes the area within which the radiation pattern 18 can be considered approximately isotropic because the sound pressure level within this cone deviates from the peak value by a maximum of 6 dB.

[0126] The radiation cone 23 with isotropic radiation behavior, where the intensity lies in a range between 0 dB and -6 dB, is hemispherical, meaning that the ultrasound is emitted with nearly the same intensity (between 6 dB and -0 dB) within an entire hemisphere. 22 UST-12371-25

[0127] March 10, 2026

[0128] Within the radiation cone 23, the ultrasound is emitted in all directions with almost identical intensity (between 6 dB and -0 dB).

[0129] This ensures that, regardless of the position or orientation of the wearer's head, a usable signal is always reflected and / or refracted and can reach microphone unit 6.

[0130] Due to the almost uniform sound distribution (between 6 dB and -0 dB) in the solid angle 19, changes in the reflected sound field (e.g., from the head) can be reliably detected by the microphone unit 6. The control unit 7 can thus decide with high precision whether the glasses 1 are being worn or not.

[0131] The isotropic emission in the hemispherical emission cone 23 allows for robust function even with slightly displaced or tilted glasses 1, as no exact adjustment is required.

[0132] The large opening angle of the radiation cone 23, which is particularly greater than 60°, particularly greater than 70°, particularly greater than 80°, particularly greater than 90°, prevents the occurrence of areas with greatly reduced intensity where reliable signal evaluation would not be possible. 23 UST-12371-25

[0133] March 10, 2026

[0134] List of reference signs

[0135] 1 pair of glasses

[0136] 2 Eyeglass frames

[0137] 3 first temple of glasses

[0138] 4 second temple of glasses

[0139] 5 speaker unit

[0140] 6 microphone unit

[0141] 7 Control unit

[0142] 8 generated sound

[0143] 9 incoming sound

[0144] 10 Recognition Unit

[0145] 11 first contact element

[0146] 12 second contact element

[0147] 13 Underside

[0148] 14 Modulator

[0149] 15 Pulse generator

[0150] 16 first loudspeaker

[0151] 17 second speaker

[0152] 18 Radiation behavior

[0153] 19 Beam angles

[0154] 20 Center line

[0155] 21 Sound pressure level

[0156] 22 Sound pressure profile

[0157] 23 beam cones

[0158] 24 Exit opening

[0159] 25 Direction of radiation

Claims

1 UST-12371-25 March 10, 2026 Patent claims 1. Glasses (1 ) for outputting audio information with a spectacle frame (2) having two temples (3, 4), with at least one loudspeaker unit (5) for generating audible sound and ultrasound, with at least one microphone unit (6) for detecting at least ultrasound and with at least one control unit (7) which can determine whether a person is wearing the glasses (1) based on the generated and detected ultrasound, characterized by that at least one loudspeaker unit (5) is arranged on one of the two temples (3, 4) and at least one microphone unit (6) is arranged on the other temple (3, 4) and that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that it exhibits an isotropic acoustic radiation behavior (18) of the ultrasound at least in one radiation cone (23).

2. Glasses according to the previous claim, characterized in that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that the radiation cone (23) of the generated ultrasound is designed such that the at least one microphone unit (6) is arranged in the radiation cone (23) of the at least one loudspeaker unit (5).

3. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that the radiation cone (23) of the isotropic acoustic radiation behavior (18) of the ultrasound forms a2 UST-12371-25 March 10, 2026 has an opening angle greater than 60°, in particular greater than 70°, in particular greater than 80°, in particular greater than 90°.

4. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that the radiation cone (23) of the isotropic acoustic radiation behavior (18) of the ultrasound has a solid angle of at least 2TT sr.

5. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that the radiation cone (23) of the isotropic acoustic radiation behavior (18) of the ultrasound is at least hemispherical.

6. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) is designed, arranged and / or configured such that an outlet opening (24) and / or a radiation direction (25) of the loudspeaker unit (5) is directed towards the ear of the person when the glasses (1) are worn as intended.

7. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) comprises a broadband loudspeaker, in particular a MEMS broadband loudspeaker, by means of which the audible sound and the ultrasound for detecting the wearing of the glasses (1) can be generated.

8. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) comprises at least two loudspeakers (16, 17), wherein a first loudspeaker (16) generates audible sound and a second loudspeaker (17) generates the ultrasound. 3 UST-12371-25 March 10, 2026 can, wherein preferably at least one of the at least two loudspeakers (16, 17) is a MEMS loudspeaker.

9. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) can generate sound with a frequency up to, in particular at least, 80 kHz.

10. Glasses according to one of the preceding claims, characterized in that the glasses (1) and / or the control unit (7) comprise a pulse generator (15) by means of which pulses of ultrasound can be generated to detect the wearing of the glasses (1).

11. Glasses according to one of the preceding claims, characterized in that the at least one loudspeaker unit (5) and / or the at least one microphone unit (6) are arranged on an underside (13) of the temples (3, 4).

12. Glasses according to one of the preceding claims, characterized in that the glasses (1) comprise a modulator (14) by means of which electrical signals corresponding to ultrasound and audible sound can be modulated together.

13. Glasses according to one of the preceding claims, characterized in that the microphone unit (6) comprises an ultrasonic microphone and / or is designed as an ultrasonic microphone.

14. Eyeglasses according to one of the preceding claims, characterized in that the eyeglasses (1) comprise a detection unit (10) by means of which it can be detected whether one of the two temples (3, 4) or whether both temples (3, 4) are open and / or folded. 4 UST-12371-25 March 10, 2026 15. Glasses according to one of the preceding claims, characterized in that the recognition unit (10) comprises at least two contact elements (11 , 12) which are arranged in the area of ​​at least one folding area of ​​the temples of the glasses.

16. Method for determining whether a person is wearing glasses (1), wherein the glasses (1) are designed according to one or more of the preceding claims, in which at least ultrasound is generated by means of the loudspeaker unit (5) arranged on at least one of the temples (3, 4), in which at least ultrasound is detected by means of the microphone unit (6) arranged on the other temple of the glasses (3, 4) and in which the control unit (7) determines whether the person is wearing the glasses (1) based on the generated and detected ultrasound, characterized by that ultrasound with isotropic acoustic radiation behavior (18) is generated by means of at least one loudspeaker unit (5) in the radiation cone (23).

17. Method according to the preceding claim, characterized in that audible sound is generated.

18. Method according to one of the preceding claims, characterized in that when the person is detected not wearing the glasses (1), the generation of the audible sound is deactivated.

19. Method according to one of the preceding claims, characterized in that the generation of audible sound is activated when the person is detected to be wearing the glasses (1). 5 UST-12371-25 March 10, 2026 20. Method according to one of the preceding claims, characterized in that the control unit (7) compares the generated and the detected sound (8, 9) with each other.

21. Method according to one of the preceding claims, characterized in that corresponding electrical signals are modulated together, in particular by means of a modulator (14), to generate the audible sound and the ultrasound.

22. Method according to one of the preceding claims, characterized in that the ultrasound is generated with a measurement frequency of up to 80 kHz, in particular up to 70 kHz, in particular up to 60 kHz, in particular up to 50 kHz, in particular up to 40 kHz.

23. Method according to one of the preceding claims, characterized in that the detection unit (10) detects whether one of the two temples (3, 4) or whether both temples (3, 4) are open and / or folded together.

24. Method according to one of the preceding claims, characterized in that the generation and / or detection of the ultrasound for detecting the wearing of the glasses (1) and / or the audible sound is deactivated when it is detected that at least one of the two temples of the glasses (3, 4) is folded together.

25. Method according to one of the preceding claims, characterized in that the generation and / or detection of the ultrasound for detecting the wearing of the glasses (1) and / or the audible sound is activated when it is detected that both temples (3, 4) of the glasses are open. 6 UST-12371-25 March 10, 2026 26. Method according to one of the preceding claims, characterized in that the ultrasound for detecting the wearing of the glasses (1) is generated in pulses.

27. Method according to one of the preceding claims, characterized in that the ultrasound pulses for detecting the wearing of the glasses (1) are generated at intervals of 100 ms, 500 ms, 1 s, 5 s or 15 s.

28. Method according to one of the preceding claims, characterized in that the ultrasound for detecting the wearing of the glasses (1) is generated with a measurement frequency at which the microphone unit (6) has a maximum sensitivity in the ultrasound range.

29. Method according to one of the preceding claims, characterized in that the ultrasound is generated with the measurement frequency in a frequency range which is 5 kHz around the frequency of the maximum sensitivity of the microphone unit (6).

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