EP3820159A1 - Hautparleur - Google Patents

Hautparleur Download PDF

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Publication number
EP3820159A1
EP3820159A1 EP20204192.7A EP20204192A EP3820159A1 EP 3820159 A1 EP3820159 A1 EP 3820159A1 EP 20204192 A EP20204192 A EP 20204192A EP 3820159 A1 EP3820159 A1 EP 3820159A1
Authority
EP
European Patent Office
Prior art keywords
speaker
resonance
frequency range
opening
audio signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20204192.7A
Other languages
German (de)
English (en)
Other versions
EP3820159B1 (fr
EP3820159C0 (fr
Inventor
Matteo Perrini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Filing date
Publication date
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Publication of EP3820159A1 publication Critical patent/EP3820159A1/fr
Application granted granted Critical
Publication of EP3820159B1 publication Critical patent/EP3820159B1/fr
Publication of EP3820159C0 publication Critical patent/EP3820159C0/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
    • H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807—Enclosures comprising vibrating or resonating arrangements
    • H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups

Definitions

  • This invention relates to an acoustic speaker.
  • the invention relates to an acoustic speaker designed and produced in particular to optimise the reproduction of audio signals, improving the sound perception of the audio signals by users.
  • microphone refers to a transducer or set of transducers capable of transforming the electrical signal from an amplifier into an acoustic signal.
  • these devices typically used in the music industry, comprise one or more speakers, which are installed on a single chassis and are able to reproduce the different frequencies audible to the human ear (between 20Hz and 20kHz).
  • amplified speakers or active speakers
  • pre-amplified speakers or passive speakers
  • Amplified speakers are equipped with at least one integrated amplifier, whilst pre-amplified speakers do not comprise any amplifier inside them.
  • the latter allow the flexibility of the audio system to be increased as they allow, for example, only the speaker itself, or the connection and power cables, or the amplifier to be replaced.
  • each of these "tower” speakers typically has, along its respective longitudinal structure, a plurality of speakers equally spaced between them, and two openings in the lower portion of this structure.
  • the number of acoustic interferences, in the prior art acoustic speakers, between the sound waves emitted by the respective speakers is less than the number of speakers themselves. This does not allow, for example, reproduction of the audio signal corresponding to a specific musical instrument, and thus to emulate its sound. Therefore, these prior art speakers do not allow a complete additive sound synthesis of the sound waves emitted by the respective speakers to be obtained.
  • the aim of the invention is to overcome the drawbacks mentioned above by making an improved acoustic speaker to optimise the reproduction of audio signals.
  • Another aim of the invention is to make an acoustic speaker with a geometry which makes it possible to combine sound signals in order to obtain a wide range of sound varieties.
  • Another aim of the invention is to provide an acoustic speaker which can handle high levels of acoustic output.
  • Another aim of the invention is to provide an acoustic speaker which is stable and easily installed in sound systems arranged inside and/or outside different types of environments such as, for example, household environments, professional environments, theatres and so on.
  • Another aim of the invention is to provide an acoustic speaker which is highly reliable, relatively easy to make, and has competitive costs if compared with the prior art.
  • the specific object of the invention is therefore an acoustic speaker for the reproduction of audio signals, comprising a first speaker and a respective first chamber, for reproducing at least one first audio signal y 1 ( t ) in a first frequency range, a second speaker and a respective second chamber, for reproducing at least one second audio signal y 2 ( t ) in a second frequency range equal to or different from said first frequency range, and a third speaker and a respective third chamber, for reproducing at least one third audio signal y 3 ( t ) in a third frequency range equal to or different from said first frequency range and from said second frequency range, a main resonance chamber provided with a main opening, and a supporting structure of said speakers and said main resonance chamber.
  • said acoustic speaker can be provided with a fourth speaker for reproducing at least one fourth audio signal y 4 ( t ) in a fourth frequency range equal to or different from said first frequency range, said second frequency range and said third frequency range, said fourth speaker can be inserted in said main opening and oriented along the Z axis.
  • said equilateral triangle which circumscribes said main opening may comprise a first side, a second side and a third side
  • said acoustic speaker also has a fourth secondary opening arranged in proximity to the middle of said third side, a fifth secondary opening arranged in proximity to the middle of said second side, and a sixth secondary opening arranged in proximity to the middle of said first side, wherein each of said fourth, fifth and sixth secondary openings is positioned at a respective vertex of a further equilateral triangle circumscribing said main opening, and wherein each of said fourth, fifth and sixth secondary openings has a substantially circular shape and is in fluid communication with said main resonance chamber.
  • said resonance structure can comprise a first face, a second face and a third face, wherein said first face has an opening for the insertion of a first supporting element fixable to a first wall, said second face has an opening for the insertion of a second supporting element fixable to a second wall, and said third face has an opening for the insertion of a third supporting element fixable to a third wall.
  • said resonance plate can be made using spruce wood laths.
  • said resonance structure can have an internal surface made of posidonia oceanica.
  • said internal surface of said resonance structure can be designed to absorb sound waves and vibrations generated by each of said first, second, third and fourth speaker, when in use, acoustically insulating said acoustic speaker from the external environment.
  • the acoustic speaker for the reproduction of audio signals substantially comprises a resonance plate P1, a first speaker 100A, a second speaker 101A, a third speaker 102A, and a fourth speaker 103A, said speakers 100A, 101A, 102A and 103A being installable in said resonance plate P1, and a resonance structure P2 which can be coupled, in use, to said resonance plate P1.
  • the resonance plate P1 of the speaker 1 has the shape substantially of an equilateral triangular and has a first L1, a second L2 and a third L3 side.
  • each of said first L1, second L2 and third L3 side has a length of 50cm.
  • said resonance plate P1 can have different shapes, such as, for example, a circular or square shape.
  • Said resonance plate P1 has a main opening 103, positioned at the centre of said resonance plate P1, as well as a first secondary opening 100 for the insertion of said first speaker 100A, a second secondary opening 101 for the insertion of said second speaker 101A, and a third secondary opening 102 for the insertion of said third speaker 102A, each of said first secondary opening 100, second secondary opening 101 and third secondary opening 102 being positioned on a respective vertex of an equilateral triangle on an XY plane circumscribing said main opening 103.
  • said fourth speaker 103A is inserted in said main opening 103.
  • said resonance plate P1 has, therefore, both a structural function, being able to support said speakers 100A, 101A, 102A and 103A, and an acoustic resonance function, amplifying the sound waves coming from the same speakers 100A, 101A, 102A and 103A.
  • each of said openings 100, 101, 102, 103 has a substantially circular shape.
  • each of said secondary openings 100, 101, 102 has a diameter of 11cm (possibly extendable up to 13cm), whilst said main opening 103 has a diameter of 18cm.
  • the shape of each of said openings 100, 101, 102, 103 may have a different shape from the above-mentioned circular shape.
  • each of said openings 100, 101, 102 is arranged on a respective vertex of an equilateral triangle on the XY plane circumscribing said main opening 103.
  • This arrangement of said openings 100, 101, 102, and 103, and therefore, of said speakers 100A, 101A, 102A, and 103A allows, as will be described in detail below, suitable combination of the audio signals emitted by the respective speakers 100A, 101A, 102A, and 103A.
  • said resonance plate P1 further has a fourth secondary opening 104, a fifth secondary opening 105 and a sixth secondary opening 106.
  • Each of said fourth 104, fifth 105 and sixth 106 secondary openings also has a substantially circular shape and is arranged at a respective vertex of a further equilateral triangle on the same plane XY circumscribing said main opening 103.
  • each of said openings 104, 105 and 106 has a diameter of 5cm, however this size typically depends on the size of the speaker 1.
  • said fourth secondary opening 104 is arranged in proximity to the middle of said third side L3
  • said fifth secondary opening 105 is arranged in proximity to the middle of said second side L2
  • said sixth secondary opening 106 is arranged in proximity to the middle of said first side L1.
  • the sound waves emitted along the direction of a Z axis, perpendicular to the XY plane, in the negative Z direction (that is, behind said resonance plate P1) from said fourth speaker 103A are emitted again along the direction of the Z axis, in the positive Z direction, (that is, in front of said resonance plate P1), thus amplifying the sound reproduced by said fourth speaker 103A.
  • the rear sound waves emitted by said fourth 103A speaker are re-timed with the front sound waves emitted by the same fourth 103A speaker (this technique is called "bass reflex" in technical jargon).
  • said resonance plate P1 is made of spruce wood strips.
  • this material has excellent properties for amplification of the sound waves generated by an instrument or device.
  • said resonance plate P1 can be made from other materials such as maple or plane tree wood.
  • said resonance plate P1 has a height of 40 cm and a thickness of 30mm.
  • the acoustic speaker 1 has a plurality of speakers 100A, 101A, 102A, and 103A coupled to respective resonance chambers and able to emit respective audio signals in predetermined frequency ranges within the range of frequencies audible by the human ear between 20Hz-20kHz.
  • said first speaker 100A is configured to reproduce at least one first audio signal y 1 ( t ) in a first frequency range
  • said second speaker 101A is configured to reproduce at least one second audio signal y 2 ( t ) in a second frequency range equal to or different from said first frequency range
  • said third speaker 102A is configured to reproduce at least one third audio signal y 3 ( t ) in a third frequency range equal to or different from said first frequency range and from said second frequency range
  • said fourth speaker 103A is configured to reproduce at least one fourth audio signal y 4 ( t ) in a fourth frequency range equal or different from said first frequency range, from said second frequency range and from said third frequency rage.
  • said first range of frequencies is equal to 2kHz-20kHz
  • said second range of frequencies is equal to 500Hz-5kHz
  • said third range of frequencies is equal to 50Hz-2kHz
  • said fourth range of frequencies is equal to 150Hz-9kHz.
  • said first speaker 100A allows the reproduction of audio signals at high frequencies (this speaker is called “Tweeter” in jargon)
  • said second speaker 101A allows the reproduction of audio signals at low frequencies (this speaker is called “Woofer” in jargon)
  • said third speaker 102A is able to reproduce audio signals at medium frequencies (this speaker is called “Midrange” in jargon)
  • said fourth speaker 103A allows the reproduction of audio signals at very low frequencies (this speaker is called “Subwoofer” in jargon).
  • said acoustic speaker 1 may comprise, for example, a high-frequency amplifier and two medium-frequency stereo amplifiers without any low-frequency amplifier, or a high-frequency amplifier, two medium-frequency stereo amplifiers, and a low-frequency amplifier.
  • Figures 3B and 3C show the acoustic interference between the sound waves emitted by three and four speakers respectively, according to the layout of the acoustic speaker 1 shown in Figure 3A .
  • Figure 3B illustrates an embodiment of the invention wherein said acoustic speaker 1 comprises a high frequency speaker 100A inserted in said opening 100, a low frequency speaker 101A inserted in said opening 101, and a medium frequency speaker 102A inserted in said opening 102.
  • FIG. 3C illustrates an embodiment of the invention wherein said acoustic speaker 1 comprises a high frequency speaker 100A inserted in said opening 100, a low frequency speaker 101A inserted in said opening 101, a medium frequency speaker 102A inserted in said opening 102, and a very low frequency speaker 103A inserted in said main opening 103.
  • the number of acoustic interferences between the sound waves emitted by the respective speakers is greater than the number of acoustic interferences of the case described above and illustrated in Figure 3B .
  • Figures 4C to 4F show in schematic view a graphic representation of acoustic interference between sound waves generated respectively by four speakers in three frequency ranges different from each other, by six speakers in three frequency ranges different from each other, by seven speakers in three frequency ranges different from each other and by six speakers in four frequency ranges different from each other.
  • said first 100A, second 101A and third 102A speakers are arranged on the same XY plane and are oriented in the same direction along the Z axis perpendicular to said XY plane, so as to reproduce, in the positive Z direction, a further audio signal y ( t ) resulting from the combination of said first audio signal y 1 ( t ), said second audio signal y 2 ( t ) and said third audio signal y 3 ( t ).
  • the Fast Fourier Transform is an optimised algorithm for calculating the Discrete Fourier Transform (DFT) or its inverse, and is typically used within dedicated software applications for personal computers, for example, in digital signal processing.
  • acoustic speaker 1 is able to reproduce the waveform corresponding to the timbre of a specific instrument, such as a violin or guitar, emulating its sound.
  • the waveform of a signal and its envelope over time can be obtained by combining multiple frequency sinusoidal waves of a fundamental frequency (the so-called "harmonics"). This can also be applied to the waveforms generated by a musical instrument, allowing, for example, the timbre and sound to be broken down into individual sine waves and vice versa.
  • the acoustic speaker 1 comprises a P2 resonance structure which can be coupled, in use, to said resonance plate P1.
  • said resonance structure P2 has a substantially regular pyramid shape with an equilateral triangular base (or equilateral tetrahedral base), wherein the angle at the vertex of each side face is right-angled.
  • said resonance structure P2 defines, together with said resonance plate (P1), a main resonance chamber 113, associated with said main opening 103 and, when present, with said fourth speaker 103A; as well as a first secondary resonance chamber 110, a second secondary resonance chamber 111, and a third secondary resonance chamber 112, associated respectively to said first secondary opening 100 and to said first speaker 100A, to said second secondary opening 101 and to said second speaker 101A and to said third secondary opening 102 and to said third speaker 102A.
  • Said main resonance chamber 113 has a substantially prism shape with a hexagonal base, wherein said hexagonal base circumscribes said main opening 103.
  • each of said first 110, second 111 and third 112 secondary resonance chambers has a substantially pyramid shape with a triangular base, wherein said triangular base coincides with each triangle circumscribing said respective first 100, second 101 and third 102 secondary opening and the height is positioned on an axis perpendicular to said triangular base and parallel to the Z axis.
  • said main resonance chamber 113 in the presence of said fourth speaker, becomes active, amplifying the further audio signal y ( t ) (or Additive Synthesis signal) through continuous pressure flows out of phase between the main opening 103, in the positive Z direction, and said fourth secondary opening 104, said fifth secondary opening 105 and said sixth secondary opening 106.
  • the resonance structure P2 comprises a first face 11, a second face 12 and a third face 13.
  • said first face 11 has a further fourth opening 114 for the insertion of a first supporting element fixable to a first wall
  • said second face 12 has a further fifth opening 115 for the insertion of a second supporting element fixable to a second wall
  • said third face 13 has a further sixth opening 116 for the insertion of a third supporting element fixable to a third wall.
  • each supporting element is able to constrain the respective face by which it is fixed to a wall by means of connecting means such as screws and the like.
  • said acoustic speaker 1 can be positioned between two adjacent walls and the ceiling in such a way that, for example, said first face 11 is fixed to a first wall, said second face 12 is fixed to a second wall and said third face 13 is fixed to said ceiling.
  • said resonance structure P2' has an internal surface P2' made by means of posidonia oceanica to acoustically isolate said speaker 1.
  • said internal surface P2' of said resonance structure P2 is able to absorb sound waves and vibrations generated along the direction of the Z axis, in the negative Z direction, by each of said first 100A, second 101A, third 102A and fourth 103A speakers, when in use, acoustically isolating said acoustic speaker 1 from the external environment.
  • this main resonance chamber 113 in the absence of the fourth speaker 103A, is not coated with resin and posidonia oceanica like, for example, the inner surface of a guitar.
  • Figure 9 shows, according to the embodiment described, the coupling between the resonance plate P1 and the resonance structure P2 of the acoustic speaker 1.
  • the acoustic speaker 1 can be connected to an audio system S comprising electrical signal generation devices and/or display devices and/or desktop PC.
  • said acoustic speaker 1 is positioned on any of said first face 11, second face 12 and said third face 13, being inclined by 45° degrees in the direction of the positive Z axes, in such a way as to emulate the reflection phenomenon typical of classical theatres.
  • Said S system can be, for example, a Hi-Fi system ("High Fidelity") equipped, among other things, with integrated amplifiers, computers, and/or A/D converters, and possibly connected to a TV or projector.
  • Hi-Fi system High Fidelity
  • said audio system S can comprise additional resonance chambers, equipped with a low frequency amplifier, on which said acoustic speaker 1 can be positioned.
  • this configuration allows a total output of between 1400W and 2000W to be reached.
  • a first advantage of the acoustic speaker according to the invention is to optimise the reproduction of audio signals.
  • a further advantage of the acoustic speaker according to the invention is that it handles high sound output levels whilst occupying little space.
  • a further advantage of the acoustic speaker according to the invention is that it can be easily installed and configured in audio systems located inside and/or outside of different rooms or easily placed on any side and/or top of walls.
  • a further advantage of the acoustic speaker according to the invention is that it comprises a plurality of speakers isolated acoustically from each other.
  • a further advantage of the acoustic speaker according to the invention is that it has a symmetrical and configurable structure. Moreover, the arrangement of the speakers, as described above, allows the audio signals associated with each speaker to be combined with a respective frequency.
  • a further advantage of the speaker according to the invention is that it has an equilateral rectangular pyramidal shape which guarantees greater stability and fewer vibrations compared to the prior art systems.
  • a further advantage of the speaker according to the invention is that it is a four-sided element and therefore, for the same volume, it has a smaller total surface area than the prior art 6-sided systems. This allows a considerable saving of time and materials during construction.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
EP20204192.7A 2019-11-08 2020-10-27 Hautparleur Active EP3820159B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000020664A IT201900020664A1 (it) 2019-11-08 2019-11-08 Diffusore acustico.

Publications (3)

Publication Number Publication Date
EP3820159A1 true EP3820159A1 (fr) 2021-05-12
EP3820159B1 EP3820159B1 (fr) 2023-06-21
EP3820159C0 EP3820159C0 (fr) 2023-06-21

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ID=69811729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20204192.7A Active EP3820159B1 (fr) 2019-11-08 2020-10-27 Hautparleur

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EP (1) EP3820159B1 (fr)
IT (1) IT201900020664A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113852901A (zh) * 2021-08-27 2021-12-28 潍坊歌尔丹拿电子科技有限公司 测试治具和测试装置
CN115993752A (zh) * 2022-12-30 2023-04-21 峰米(重庆)创新科技有限公司 投影设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1303602A (fr) * 1971-03-12 1973-01-17
US20100177921A1 (en) * 2009-01-14 2010-07-15 Richard Bos Response speaker system
US20120195447A1 (en) * 2011-01-27 2012-08-02 Takahiro Hiruma Sound field control apparatus and method
US8967323B1 (en) * 2012-12-27 2015-03-03 James Robert Grenier Multi-directional foldback and front of house speaker enclosure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521655B1 (fr) * 1991-06-25 1998-01-07 Yugen Kaisha Taguchi Seisakusho Cluster des hàut-parleurs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1303602A (fr) * 1971-03-12 1973-01-17
US20100177921A1 (en) * 2009-01-14 2010-07-15 Richard Bos Response speaker system
US20120195447A1 (en) * 2011-01-27 2012-08-02 Takahiro Hiruma Sound field control apparatus and method
US8967323B1 (en) * 2012-12-27 2015-03-03 James Robert Grenier Multi-directional foldback and front of house speaker enclosure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113852901A (zh) * 2021-08-27 2021-12-28 潍坊歌尔丹拿电子科技有限公司 测试治具和测试装置
CN113852901B (zh) * 2021-08-27 2023-11-07 潍坊歌尔丹拿电子科技有限公司 测试治具和测试装置
CN115993752A (zh) * 2022-12-30 2023-04-21 峰米(重庆)创新科技有限公司 投影设备

Also Published As

Publication number Publication date
EP3820159B1 (fr) 2023-06-21
IT201900020664A1 (it) 2021-05-08
EP3820159C0 (fr) 2023-06-21

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