Glass diaphragm module

Abstract

Provided is a glass diaphragm module (10) which comprises: a glass plate (12) constituting a window glass; a first vibration component (14) attached to the glass plate (12); and a second vibration component (18) attached to a holding member (16) that holds the glass plate (12). A desired sound can be output by vibrating the first vibration component (14) attached to the glass plate (12) and the second vibration component (18) attached to the holding member (16).

Description

Glass diaphragm module

[0001] The present disclosure relates to a glass diaphragm module.

[0002] U.S. Patent Application Publication No. 2012 / 0194916 discloses a structure in which an exciter (vibrating component) is attached to a vehicle window glass. In the structure of U.S. Patent Application Publication No. 2012 / 0194916, the exciter is attached to a masking portion at the peripheral edge of the window glass, making the exciter less noticeable.

[0003] However, if the window glass is small, and the exciter is attached in an undesirable position to vibrate the glass, it may not be possible to output sufficient sound pressure.

[0004] An object of the present disclosure is to provide a glass diaphragm module that can output a desired sound in a configuration in which sound is output by vibrating glass.

[0005] The glass vibration plate module according to the present disclosure comprises a glass plate constituting a window glass, a first vibration component attached to the glass plate, and a second vibration component attached to a holding member that holds the glass plate.

[0006] The glass diaphragm module according to the present disclosure can output a desired sound in a configuration in which sound is output by vibrating glass.

[0007] 1 is a rear view showing the rear glass of a vehicle to which a glass vibration plate module according to an embodiment is applied; FIG. 2 is a model diagram of a cross section of the glass vibration plate module according to an embodiment; FIG. 3 is a schematic diagram showing the sound output when only a first vibrator is vibrated; FIG. 4 is a schematic diagram showing the sound output when the first vibrator and the second vibrator are vibrated in synchronous with each other; FIG. 5 is a graph of the piston vibration range when only the first vibrator is vibrated; FIG. 6 is a graph of the piston vibration range when the first vibrator and the second vibrator are vibrated in synchronous with each other; FIG. 7 is a graph showing the relationship between the amount of vibration propagation to the tail door and frequency, in which the dashed line indicates the case where only the first vibrator is vibrated and the solid line indicates the case where the second vibrator is vibrated in the opposite phase to the first vibrator; FIG. 8 is a rear view showing the rear glass of a vehicle to which a glass vibration plate module according to an embodiment is applied, and is a diagram showing an example in which an acceleration sensor is attached; FIG. 9 is a perspective view of a vehicle to which a glass vibration plate module according to a first modified example is applied, seen from diagonally rear; FIG. 10 is a cross-sectional view of a tailgate spoiler of a vehicle in the first modified example; Fig. 12 is a cross-sectional view showing a state cut along line 12-12 in Fig. 11. Fig. 13 is a cross-sectional view of a roof glass in a third modified example.

[0008] A preferred embodiment of the glass diaphragm module according to the present disclosure will be described below with reference to the drawings. While the application of the glass diaphragm module to a vehicle window glass will be described below, the glass diaphragm module according to the present disclosure may also be applied to other moving objects, such as airplanes, helicopters, ships, and trains, in addition to vehicles. The glass diaphragm module according to the present disclosure may also be applied to window glass in buildings and other structures.

[0009] A glass diaphragm module 10 according to an embodiment will be described with reference to the drawings.

[0010] FIG. 1 is a schematic front view of a glass diaphragm module 10 as viewed from the main surface side. As shown in FIG. 1 , in this embodiment, the glass diaphragm module 10 is applied to the rear window (back window) of a vehicle. The glass diaphragm module 10 includes a rear window 12 as a glass plate, a back door 16 as a holding member for holding the rear window 12, a first vibrator 14 as a first vibrating component, and a second vibrator 18 as a second vibrating component. In the following description, for convenience of explanation, the up-down direction (up-down direction on the paper surface of FIG. 1 ) when viewing the glass diaphragm module 10 from the front will be referred to as "up-down," and the left-right direction (left-right direction on the paper surface of FIG. 1 ) will be referred to as "left-right."

[0011] The rear windshield 12 constitutes the vehicle's window glass and is fixed to the vehicle body in a state where it cannot be raised or lowered. The rear windshield 12 is often a single-pane glass, but it may also be a laminated glass made of two glass plates bonded together with a resin interlayer. The rear windshield 12 is made of transparent or translucent inorganic glass. Examples of inorganic glass that can be used include soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, and quartz glass.

[0012] When the rear glass 12 is made of inorganic glass and is a single-pane glass, it is preferable that the rear glass 12 be tempered glass. Tempered glass has a compressive stress layer formed on its surface, and may be either air-cooled tempered glass or chemically tempered glass. When the tempered glass is physically tempered glass (e.g., air-cooled tempered glass), the compressive stress layer may be formed on the glass surface by a temperature difference between the glass surface and the interior of the glass, using an operation other than slow cooling, such as rapidly cooling a uniformly heated glass sheet from a temperature near its softening point during bending. When the tempered glass is chemically tempered glass, the compressive stress layer may be formed on the glass surface by an ion exchange method or the like after bending.

[0013] If the rear glass 12 is a laminated glass consisting of two glass plates bonded together with a resin intermediate layer, both glass plates may be untempered, only one may be tempered, or both may be tempered. If both glass plates are tempered, both may be air-cooled tempered glass, both may be chemically tempered glass, or one may be cold-tempered glass and the other may be chemically tempered glass.

[0014] The rear glass 12 may be made of organic glass, such as PMMA (polymethyl methacrylate) resin, PC (polycarbonate) resin, PS (polystyrene) resin, PET (polyethylene terephthalate) resin, PVC (polyvinyl chloride) resin, or cellulose resin.

[0015] When the rear window 12 is a single piece of glass, the thickness of the rear window 12 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and even more preferably 1.5 mm or more. This improves the rigidity and strength of the rear window 12, making it easier for piston vibration to occur. Furthermore, when the rear window 12 is a single piece of glass, from the perspective of reducing the weight of the glass diaphragm module 10, the thickness of the rear window 12 is preferably 10.0 mm or less, more preferably 7.0 mm or less, and even more preferably 5.0 mm or less.

[0016] When the rear glass 12 is formed of laminated glass in which two glass plates are bonded together with a resin intermediate layer, the thickness of each of the pair of glass plates constituting the rear glass 12 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and even more preferably 1.5 mm or more. The pair of glass plates constituting the rear glass 12 may have the same or different thicknesses, but the same thickness is preferable from the viewpoint of stabilizing sound pressure. Furthermore, the total thickness of the rear glass 12 is preferably 1.0 mm or more, more preferably 2.0 mm or more, and even more preferably 3.0 mm or more. Furthermore, from the viewpoint of reducing the weight of the glass diaphragm module 10, the total thickness is preferably 10.0 mm or less, more preferably 8.0 mm or less, and even more preferably 6.0 mm or less.

[0017] When the rear glass 12 is laminated glass, the intermediate layer may be, for example, a transparent polyvinyl butyral (PVB)-based or ethylene-vinyl acetate copolymer (EVA)-based resin film, or a resin film containing a thermosetting adhesive material such as a silicone (PDMS)-based, polyurethane-based, fluorine-based, polyethylene terephthalate-based, or polycarbonate-based material. The intermediate layer may also contain a material that enhances sound insulation, a material that enhances rigidity, or a material that absorbs ultraviolet or infrared rays. The intermediate layer may also be a liquid or gel-like intermediate layer. Specific examples of liquid intermediate layers include water, oil, organic solvents, liquid polymers, ionic liquids, and mixtures thereof. More specifically, examples of the gel-like intermediate layer include propylene glycol, dipropylene glycol, tripropylene glycol, straight silicone oil (dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil), modified silicone oil, acrylic acid polymer, liquid polybutadiene, glycerin paste, fluorine-based solvent, fluorine-based resin, acetone, ethanol, xylene, toluene, water, mineral oil, and mixtures thereof. Among these, it is preferable to include at least one selected from the group consisting of propylene glycol, dimethyl silicone oil, methylphenyl silicone oil, methylhydrogen silicone oil, and modified silicone oil, and it is more preferable to use propylene glycol or silicone oil as the main component. Specific examples of the gel-like intermediate layer include carbon-based, fluorine-based, and silicone-based polymer materials. Specific examples include ABS, AES, AS, CA, CN, CPE, EEA, EVA, EVOH, IO, PMMA, PMP, PP, PS, PVC, RB, TPA, TPE, TPEE, TPF, TPO, TPS, TPU, TPVC, AAS, ACS, PET, PPE, PA6, PA66, PBN, PBT, PC, POM, PPO, ETFE, FEP, LCP, PEEK, PEI, PES, PFA, PPS, PSV, PTFE, PVDF, silicone, polyurethane, PI, and PF. Alternatively, composite materials combining the above materials may be used. The above materials may be used alone or in combination of two or more.The thickness of the intermediate layer may be, for example, 0.1 μm to 3.0 mm, 1.0 μm to 2.8 mm, or 3.0 μm to 2.6 mm. When the rear glass 12 is laminated glass, a light-control film that electrically changes the visible light transmittance may be sandwiched between the two glass plates. Examples of light-control films that can be used include a PDLC (Polymer Dispersed Liquid Crystal) film, an electrochromic material, and a photochromic material.

[0018] In this embodiment, the rear window 12 is formed, for example, in a substantially rectangular shape with its longitudinal direction aligned with the vehicle width direction. Two first vibrators 14 are attached to the rear window 12. Each of the first vibrators 14 is connected to a power source (not shown) and is an actuator that vibrates the rear window 12, which is a glass plate structure, in response to an input electrical signal. In this embodiment, the first vibrator 14 is, for example, a voice coil motor including a coil portion and a magnetic circuit. One of the coil portion and the magnetic circuit is fixed to the rear window 12, and the other is arranged to be movable relative to the rear window 12. When a current flows through the coil portion, interaction between the coil portion and the magnetic circuit generates vibration, causing the rear window 12 to vibrate (excite). The vibration direction is the thickness direction of the first vibrator 14. Note that the first vibrator 14 is not limited to a voice coil motor. An actuator other than a voice coil motor, such as a piezoelectric actuator, may be used as long as it is capable of transmitting desired vibrations to the rear window 12.

[0019] The number of first vibrators 14 to be arranged is not particularly limited, and a structure in which only one first vibrator 14 is attached to the rear window 12 may be used. Alternatively, three or more first vibrators 14 may be attached to the rear window 12. The distance between adjacent first vibrators 14 is also not particularly limited.

[0020] The position at which the first vibrator 14 is disposed is not particularly limited, but from the viewpoint of ensuring visibility for the driver, it is preferably attached to the peripheral portion of the rear window 12. For example, it is preferably within 1.0 m, more preferably within 0.5 m, and even more preferably within 0.3 m from the edge of the rear window 12. Furthermore, from the viewpoint of suppressing a decrease in yield in the mounting process, it is preferably at a position at least 0.01 m away from the edge of the rear window 12, more preferably at least 0.05 m, and even more preferably at least 0.07 m away.

[0021] Two second vibrators 18 are attached to the back door 16, which serves as a holding member for holding the rear glass 12. Note that the term "holding member" as used herein is not limited to a structure that directly holds an object to be held, but broadly includes a structure that indirectly holds an object by using a sealant or the like. In this embodiment, a sealant is interposed between the rear glass 12 and the back door 16, but the rear glass 12 is indirectly held by the back door 16, and vibrations of the rear glass 12 are transmitted to the back door 16 via the sealant.

[0022] The second vibrator 18 is an actuator that vibrates the back door 16 in response to an input electrical signal, similar to the first vibrator 14, and is a voice coil motor including a coil portion and a magnetic circuit. However, the second vibrating component is not limited to this, and may be configured by other actuators such as a piezoelectric type.

[0023] The distance between the first vibrator 14 and the second vibrator 18 is preferably 0.5 cm or more, more preferably 2.0 cm or more, and even more preferably 5.0 cm or more. From the viewpoint of controlling the module, the distance is preferably 300 cm or less, more preferably 100 cm or less, and even more preferably 50 cm or less.

[0024] In the glass vibration plate module 10 shown in FIG. 1 , the second vibrator 18 is disposed below the rear window 12, but the position at which the second vibrator 18 is disposed is not particularly limited. The second vibrator 18 may be disposed above the rear window 12. For example, as shown in FIGS. 9 and 10 , the second vibrator 18 may be disposed on a tailgate spoiler 17 disposed above the back door 16. When at least two or more second vibrators 18 are disposed in the glass vibration plate module 10, at least one may be disposed above the rear window 12 and at least one may be disposed below the rear window 12.

[0025] Controlling the frequency near the resonant frequency of the tailgate spoiler 17 is preferable because it prevents a decrease in sound pressure inside the vehicle caused by energy loss due to self-excited vibration of the tailgate spoiler 17, and also makes it possible to control the phase, harmonic distortion, and attenuation rate.

[0026] When a vibrator is disposed on the tailgate spoiler 17, it is sufficient to dispose at least one vibrator, but disposing two or more vibrators is preferable since more precise control is possible. In particular, the same effect can be obtained by disposing a vibrator not only on the tailgate spoiler 17 but also on a component of the vehicle body or frame.

[0027] 2 is a cross-sectional model diagram of the glass diaphragm module 10 according to the embodiment. As shown in FIG. 2, the first vibrator 14 is fixed to the rear glass 12 via a first mount member 20. An adhesive layer 22 is provided between the first mount member 20 and the rear glass 12, and the first mount member 20 is attached to the rear glass 12 via the adhesive layer 22.

[0028] A pressure-sensitive adhesive or the like can be used as the adhesive layer 22 as appropriate. For example, a sheet-shaped adhesive tape can be used as the pressure-sensitive adhesive. Also, an adhesive or the like can be used as the adhesive layer 22 as appropriate. For example, an acrylic, silicone, urethane, epoxy, phenol, epoxy silicone, cyanoacrylate, or other adhesive material can be used as the adhesive. Also, adhesives that are thermosetting, moisture-curing, two-component mixing curing, ultraviolet curing, visible light curing, anaerobic curing, or the like can be used.

[0029] The thinner the adhesive layer 22, the more effectively it can transmit vibrations from the first vibrator 14 to the rear glass 12, so it is sufficient if the thickness is 5.0 mm or less, preferably 3.0 mm or less, more preferably 1.0 mm or less, and particularly preferably 0.5 mm or less.

[0030] In addition, if the rear glass 12 is equipped with a conductive wire (e.g., a defogger, an antenna, etc.) formed by printing and baking a paste containing a conductive metal (e.g., silver paste, etc.) on the main surface inside the vehicle, it is preferable that the first vibrator 14 and the first mounting member 20 be attached so as not to overlap with the conductive wire.

[0031] The rear glass 12 may be coated with a coating material such as a low-E (low emissivity) material, an anti-glare (AG) coating material, an anti-reflection (AR) coating material, an anti-fingerprint (AF) coating material, an ultraviolet (UV) cut coating material, an anti-fog coating material, an anti-fungal coating material, and a water-repellent coating material.

[0032] Furthermore, the rear glass 12 may be color glass baked in blue, red, green, gray, or the like, or may be light-control glass. For example, a PDLC (Polymer Dispersed Liquid Crystal) film, an electrochromic material, a photochromic material, or the like may be used.

[0033] The peripheral edge of the rear window 12 may be provided with a light-shielding layer of a predetermined width, formed of a color ceramic layer (e.g., black, dark, or white), or a color ink layer printed with organic or inorganic ink. The light-shielding layer is provided continuously around the entire peripheral edge of the rear window 12, but may have at least a portion without the light-shielding layer. The light-shielding layer prevents adhesives and other materials from being visible from outside the vehicle. A defogger (not shown) for clearing fogging (anti-fogging) may be formed on the interior surface of the rear window 12. The defogger has multiple heater wires extending in the width direction of the rear window 12 and two bus bars extending in the vertical direction, with several heater wires formed between the two bus bars. The defogger is formed by printing and firing a silver paste containing silver powder and glass frit on the surface of the rear window 12. It is preferable that the first mount member 20 be attached so as not to overlap with the two bus bars and heater wires.

[0034] The first vibrator 14 has a connection portion 14A on the first mount member 20 side, and the first vibrator 14 is attached to the first mount member 20 via the connection portion 14A. The connection portion 14A may be, for example, a bolt or a screw, or a protrusion that slides into and engages with the first mount member 20.

[0035] The structure for attaching the first vibrator 14 to the first mount member 20 is not particularly limited, and a mechanical fastening structure such as bolts, nails, clips, or rivets may be used. Alternatively, a structure may be used in which a slide groove is formed on one of the first mount member 20 and the first vibrator 14, and a protrusion that engages with the slide groove is formed on the other, and the first vibrator 14 is fastened by sliding. Furthermore, the first vibrator 14 may be attached to the first mount member 20 via an adhesive interface such as tape, adhesive, felt, foam, rubber, grease, gel, or plastic.

[0036] The first mount member 20 may be formed from a metal such as stainless steel, aluminum, or titanium, or at least a portion of the first mount member 20 may be formed from a resin such as plastic. As the plastic, general engineering plastics such as ABS, PVC, PC, PP, PBT, PA66, and PPS may be used, or fiber-reinforced plastics including glass fiber and carbon fiber may be used.

[0037] The thinner the thickness of the first mounting member 20, the lower the height, and it is preferably 50 mm or less, more preferably 30 mm or less, even more preferably 20 mm or less, and particularly preferably 10 mm or less. Furthermore, the first mounting member 20 is formed in a flat cylindrical shape, but it may be formed in a shape other than a circle in a plan view, such as a rectangle or a polygon.

[0038] The back door 16 is made of metal, resin, a composite of metal and resin, or the like, and from the viewpoint of reflecting the excitation vibration of the second vibrator 18, the Young's modulus of the back door 16 is set to 1.0×10 ７ [Pa] or more is preferable, and 1.0 × 10 ８ [Pa] or more is more preferable, and 1.0 × 10 ９ [Pa] or more is more preferable, and 1.0 × 10 １０ [Pa] or more is particularly preferred.

[0039] The second vibrator 18 is fixed to the back door 16 via a second mount member 24. An adhesive layer 24 is provided between the second mount member 24 and the back door 16, and the second mount member 24 is attached to the back door 16 via the adhesive layer 24.

[0040] The second mount member 24 has the same configuration as the first mount member 20 , and the adhesive layer 24 that secures the second mount member 24 is the same adhesive layer as the adhesive layer 22 that secures the first mount member 20 .

[0041] The second vibrator 18 has a connection portion 18A on the second mount member 24 side, and the second vibrator 18 is attached to the second mount member 24 via the connection portion 18A. The connection portion 18A may be, for example, a bolt or a screw, or a protrusion that slides into and engages with the second mount member 24.

[0042] Here, the first vibrator 14 and the second vibrator 18 are set so that when mounted on glass, the transition band between the piston vibration band and the divided vibration band is 50 Hz or higher. The resonant frequency of the glass vibrating plate on which the first vibrator 14 is mounted is set to 1000 Hz or lower. The resonant frequency of the glass vibrating plate is preferably 500 Hz or lower, more preferably 200 Hz or lower, and even more preferably 100 Hz or lower.

[0043] The resonant frequency of the back door 16 on which the second vibrator 18 is mounted is set to 2000 Hz or less. The resonant frequency of the back door 16 is preferably 1000 Hz or less, more preferably 500 Hz or less, and even more preferably 200 Hz or less.

[0044] In this embodiment, the first vibrator 14 and the second vibrator 18 are controlled to vibrate in synchronization, and the output sound pressure can be improved by synchronizing the vibrations of the first vibrator 14 and the second vibrator 18. This effect will be described with reference to FIGS.

[0045] 3 is a schematic diagram showing the sound output when only the first vibrator 14 is vibrated. As shown in Fig. 3, when only the first vibrator 14 is vibrated to vibrate the rear window 12, sound is output from the rear window 12 as indicated by SW in the figure.

[0046] In FIG. 3 , the second vibrator 18 is not vibrating, so the vibrations propagated from the rear window 12 to the back door 16 are attenuated by the back door 16 .

[0047] Next, Fig. 4 is a schematic diagram showing the sound output when the first vibrator 14 and the second vibrator 18 are vibrated in synchronization. As shown in Fig. 4, by vibrating the second vibrator 18 in synchronization, the back door 16 is vibrated in the same manner as the rear window 12. As a result, as indicated by SW in the figure, both the rear window 12 and the back door 16 vibrate simultaneously as a surface, which increases the vibration area and improves the output sound pressure.

[0048] Furthermore, the piston vibration range can be shifted to the higher frequency side by synchronously vibrating the first vibrator 14 and the second vibrator 18. Fig. 5 is a graph of the piston vibration range when only the first vibrator 14 is vibrated, and Fig. 6 is a graph of the piston vibration range when the first vibrator 14 and the second vibrator 18 are vibrated synchronously.

[0049] The horizontal axis of the graph represents frequency, and the vertical axis of the graph represents sound pressure level and impedance. The solid line L1 in the graph represents the relationship between frequency and sound pressure level. The dashed line L2 in the graph represents the relationship between frequency and impedance. Details of the graph can be found in books such as "Speaker & Enclosure Encyclopedia" (by Tamon Saeki, Seibundo Shinkosha, 2018).

[0050] Looking at the solid line L1, there is a frequency range higher than the lowest resonance frequency where the sound pressure level and vibration level drop significantly (dotted line C). The dashed line L2 shows the measured impedance for each frequency, and there is a peak where the impedance rises slightly at the frequency where the sound pressure level and vibration level drop significantly (dotted line C). This frequency is the so-called "midrange valley" and is the boundary between the piston vibration range and the divided vibration range.

[0051] Comparing the graph shown in FIG. 5 with the graph shown in FIG. 6, it can be seen that the piston vibration range shifts to the higher frequency side when the first oscillator 14 and the second oscillator 18 are vibrated synchronously compared to when only the first oscillator 14 is vibrated.

[0052] In addition, in this embodiment, the second vibrating component 18 is configured to vibrate at a different phase angle from the first vibrating component 14. By vibrating the second vibrating component 18 at a different phase angle from the first vibrating component 14, the vibrations propagating to the back door 16 and the vehicle body are canceled out, and the vibrations of the rear window 12 are prevented from propagating to the surroundings, thereby making it possible to output a desired sound.

[0053] Figure 7 is a graph showing the relationship between the amount of vibration propagation to the back door 16 and frequency, with the dashed line indicating the case where only the first vibrator 14 is vibrated, and the solid line indicating the case where the second vibrator 18 is vibrated at a phase angle different from that of the first vibrator 14.

[0054] As shown in FIG. 7, by vibrating the second vibrator 18 at a phase angle different from that of the first vibrator 14, the vibrations propagating to the back door 16 are cancelled out, and the amount of vibration propagation is reduced.

[0055] 8 is a rear view showing a rear glass of a vehicle to which the glass vibration plate module according to the embodiment is applied, and is a diagram showing an example in which an acceleration sensor is attached. As shown in Fig. 8, a reference acceleration sensor 19 is provided on a back door 16 or a vehicle body of the vehicle. In the example shown in Fig. 8, six acceleration sensors 19 are attached at intervals, but the attachment positions and number of the acceleration sensors 19 are not particularly limited.

[0056] The second vibrating component 18 is vibrated so as to reduce the vibration propagation amount based on the vibration propagation amount detected by each acceleration sensor 19. By calculating the vibration propagation amount based on the signals acquired from each acceleration sensor 19, the vibration propagating to the back door 16 can be constantly canceled out.

[0057] Alternatively, the second vibrating part 18 may be vibrated based on information input in advance. In this case, it is sufficient to attach the acceleration sensor 19 only to a test vehicle for calculating the vibration propagation amount, and therefore it is not necessary to provide sensors such as the acceleration sensor 19 to vehicles distributed on the market.

[0058] The glass vibration plate module according to the embodiment has been described above. However, it should be understood that various modifications can be made without departing from the spirit and scope of the present disclosure. In the above embodiment, the rear windshield 12 is the window glass and the back door 16 is the retaining member. However, this is not limiting. For example, the glass vibration plate module may be applied to a vehicle roof glass. In this case, the glass plate constituting the window glass is the roof glass, and the retaining member is the vehicle roof panel. Furthermore, the glass vibration plate module may be applied to a vehicle side door glass. In this case, the glass plate constituting the window glass is the side door glass, and the retaining member is the door sash. When the side door glass is closed, the side door glass is held by the door sash. Therefore, by attaching the second vibrator 18 to the door sash or its periphery, the same effect as in the embodiment can be achieved. Furthermore, the glass vibration plate module may be applied to a vehicle windshield. In this case, the glass plate constituting the window glass is the windshield, and the retaining members are the front header near the top edge of the windshield, pillars (A-pillars) near the left and right sides, and cowl louvers that hold the windshield near the bottom edge. Furthermore, the glass vibration plate module may be applied to a vehicle rear quarter glass. In this case, the glass plate constituting the window glass serves as the rear quarter glass, and the holding member serves as the vehicle body panel around the rear quarter glass.

[0059] The first and second vibration components may share the same channel (signal transmission path). In this case, two vibrators installed in different locations can be made to sound in perfect phase without imposing a computational load on the system, and the effect of amplifying the sound pressure of the vibrations emitted by the first and second vibrators can be expected.

[0060] Furthermore, the first and second transducers may share the same channel and may be provided with a pass filter for band division. By dividing the frequency bands according to the installation location and characteristics while sounding the first and second transducers in phase, it is possible to control the acoustic effects and localization. This allows for greater design freedom in the acoustic experience inside the vehicle.

[0061] Furthermore, the number of first vibrations may be less than the number of second vibrators. Since glass has a higher sound propagation speed and is less susceptible to attenuation than interior materials containing resins, etc., vibrations can be transmitted to the entire plate surface even with a relatively small number of vibrators. Furthermore, since glass is a see-through area and it is desirable to design it so that as few vibrators as possible are placed there in order to ensure visibility, installing more second vibrators in the interior material makes it possible to increase the degree of freedom in the overall acoustic design while maintaining the functionality of the vehicle.

[0062] Furthermore, the difference between the lowest resonance frequency of the glass plate and the lowest resonance frequency of the holding member may be 3 Hz or more. If the glass and the holding member, which are different vibration sources, have the same lowest resonance frequency, vibration control cannot be performed using specific signals such as the lowest resonance frequency and its harmonics, resulting in the generation of acoustic distortion and making phase control more difficult. Furthermore, excessive sensitivity to specific frequencies in vehicle body vibrations caused by driving, etc., can lead to the generation of back electromotive force and physical equipment failure. For this reason, it is useful to have a certain degree of difference between the lowest resonance frequencies of the two.

[0063] Furthermore, it is preferable that the minimum resonance frequency of the glass plate is 1500 [Hz] or less, and the minimum resonance frequency of the holding member is 1000 [Hz] or less. Equal loudness is generally known as the ability of humans to perceive sound, and a higher acoustic effect can be achieved by actively utilizing sounds of 2000 [Hz] or more. Also, from the viewpoint of the mechanical durability of the vibrator, it is desirable to drive at a frequency higher than the minimum resonance frequency. Furthermore, when reproducing sounds of 2000 [Hz] or less, higher vibrations (sound pressure) are required, and by lowering the minimum resonance frequency accordingly, it is possible to drive with less mechanical damage.

[0064] Fig. 11 is a diagram showing a roof glass of a vehicle, and Fig. 12 is a cross-sectional view taken along line 12-12 in Fig. 11. As shown in Figs. 11 and 12, a reinforcement 34 serving as a holding member is fixed to the roof glass 32. The reinforcement 34 is a framework member joined to the roof glass 32.

[0065] The reinforcement 34 is attached to the roof glass 32 via an adhesive layer 36, but the reinforcement 34 may be attached by other methods. In addition, four first vibrators 14 are attached to the roof glass 32, and two second vibrators 18 are attached on the reinforcement 34.

[0066] The second vibrator 18 is covered with an interior material 38. The entire reinforcement 34 may be covered with the interior material 38.

[0067] The second vibrator 18 is disposed on the reinforcement 34 and can attenuate the vibrations that spread across the glass plate surface of the roof glass 32. As shown in FIG. 13, the second vibrator 18 may be attached to an interior material 38.

[0068] Furthermore, the glass plate module of the present disclosure may be applied to window glass of a building, not just a vehicle. In this case, the holding member serves as a frame for a building material that surrounds the periphery of the window glass. That is, the glass plate module of the present disclosure can be widely applied to various types of window glass. The glass plate module can also be applied to moving bodies other than vehicles. For example, the glass plate module may be applied to trains, airplanes, helicopters, drones, and the like.

[0069] The following additional notes are provided regarding the above-described embodiment.

[0070] (Supplementary Note 1) A glass vibration plate module having a glass plate constituting a window glass, a first vibration component attached to the glass plate, and a second vibration component attached to a holding member that holds the glass plate. (Supplementary Note 2) The glass vibration plate module according to Supplementary Note 1, wherein a plurality of the first vibration components and a plurality of the second vibration components are provided. (Supplementary Note 3) The glass vibration plate module according to Supplementary Note 1 or Supplementary Note 2, wherein the second vibration component vibrates in synchronization with the first vibration component. (Supplementary Note 4) The glass vibration plate module according to Supplementary Note 1 or Supplementary Note 2, wherein the second vibration component vibrates in antiphase with the first vibration component. (Supplementary Note 5) The glass vibration plate module according to any one of Supplementary Notes 1 to 5, wherein the glass plate is a rear glass of a vehicle, and the holding member is a back door. (Supplementary Note 6) The glass vibration plate module according to any one of Supplementary Notes 1 to 5, wherein the glass plate is a roof glass of a vehicle, and the holding member is a roof. (Supplementary Note 7) The glass diaphragm module according to any one of Supplementary Notes 1 to 5, wherein the glass plate is a windshield of a vehicle, and the holding member is at least one of a front header, pillars on both sides, and cowl louvers. (Supplementary Note 8) The glass diaphragm module according to any one of Supplementary Notes 1 to 5, wherein the glass plate is a rear quarter glass of a vehicle, and the holding member is a vehicle body panel around the rear quarter glass. (Supplementary Note 9) The glass diaphragm module according to any one of Supplementary Notes 1 to 8, wherein a distance between the first vibrating component and the second vibrating component is 0.5 cm or more and 300 cm or less. (Supplementary Note 10) The glass diaphragm module according to any one of Supplementary Notes 1 to 5, wherein the glass plate constitutes a window of a building, and the holding member is a frame for the glass plate. (Supplementary Note 11) The glass diaphragm module according to any one of Supplementary Notes 1 to 10, wherein the first vibrator and the second vibrator 18 are set so that a transition range between a piston vibration range and a divided vibration range is 50 Hz or more. (Supplementary Note 12) The glass diaphragm module according to any one of Supplementary Notes 1 to 11, wherein the first vibration component and the second vibration component share the same channel.(Supplementary Note 13) The glass diaphragm module according to any one of Supplementary Notes 1 to 11, wherein the first vibrator and the second vibrator share the same channel and include a pass filter for band division. (Supplementary Note 14) The glass diaphragm module according to Supplementary Note 2, wherein the number of first vibrators is smaller than the number of second vibrators. (Supplementary Note 15) The glass diaphragm module according to any one of Supplementary Notes 1 to 14, wherein the difference between the lowest resonance frequency of the glass plate and the lowest resonance frequency of the holding member is 3 Hz or more. (Supplementary Note 16) The glass diaphragm module according to any one of Supplementary Notes 1 to 15, wherein the lowest resonance frequency of the glass plate is 1500 Hz or less. (Supplementary Note 17) The glass diaphragm module according to any one of Supplementary Notes 1 to 16, wherein the lowest resonance frequency of the holding member is 1000 Hz or less. (Supplementary Note 18) The glass diaphragm module according to Supplementary Note 1, wherein the glass plate is a roof glass of a vehicle, and the holding member is a framework member joined to the roof glass. (Supplementary Note 19) The glass diaphragm module according to Supplementary Note 1, wherein the first vibrator is installed in a non-transparent portion formed on a portion of the glass plate. (Supplementary Note 20) The glass diaphragm module according to Supplementary Note 1, wherein the first vibrating component is attached within a range of 1.0 m and 0.01 m or more from an edge of the glass plate. The disclosure of Japanese Patent Application No. 2024-010464 is incorporated herein by reference in its entirety. All documents, patent applications, and technical standards described herein are incorporated herein by reference to the same extent as if each individual document, patent application, and technical standard were specifically and individually indicated to be incorporated by reference.

[0071] 10 Glass vibration plate module 12 Rear glass (glass plate) 14 First vibrator (first vibration component) 16 Back door (holding member) 18 Second vibrator (second vibration component)

Claims

1. A glass diaphragm module having a glass plate constituting a window glass, a first vibrating component attached to the glass plate, and a second vibrating component attached to a holding member that holds the glass plate.

2. The glass diaphragm module according to claim 1, wherein a plurality of the first vibrating components and a plurality of the second vibrating components are provided respectively.

3. The glass diaphragm module according to claim 1, wherein the second vibrating component vibrates in synchronization with the first vibrating component.

4. The glass diaphragm module according to claim 1, wherein the second vibrating component vibrates in a reverse phase to the first vibrating component.

5. The glass diaphragm module according to claim 1, wherein the glass plate is a rear glass of a vehicle, and the holding member is a back door.

6. The glass diaphragm module according to claim 1, wherein the glass plate is a roof glass of a vehicle, and the holding member is a roof.

7. The glass diaphragm module according to claim 1, wherein the glass plate is a front glass of a vehicle, and the holding member is at least one of a front header, pillars on both sides, and a cowl louver.

8. The glass diaphragm module according to claim 1, wherein the glass plate is a rear quarter glass of a vehicle, and the holding member is a vehicle body panel around the rear quarter glass.

9. The glass diaphragm module according to claim 1, wherein the distance between the first vibrating component and the second vibrating component is 0.5 [cm] or more and 300 [cm] or less.

10. The glass diaphragm module according to claim 1, wherein the glass plate constitutes a window of a building, and the holding member is a frame of the glass plate.

11. The glass diaphragm module according to claim 1, wherein the first vibrator and the second vibrator are set such that a transition region between a piston vibration region and a split vibration region is 50 [Hz] or more.

12. The glass diaphragm module according to claim 1, wherein the first vibrating component and the second vibrating component share the same channel.

13. The glass diaphragm module according to claim 1, wherein the first vibrator and the second vibrator share the same channel and are provided with a band-splitting pass filter.

14. The glass diaphragm module according to claim 2, wherein the number of the first vibrations is less than the number of the second vibrators.

15. The glass diaphragm module according to claim 1, wherein the difference between the lowest resonance frequency of the glass plate and the lowest resonance frequency of the holding member is 3 [Hz] or more.

16. The glass diaphragm module according to claim 1, wherein the lowest resonance frequency of the glass plate is 1500 [Hz] or less.

17. The glass diaphragm module according to claim 1, wherein the lowest resonance frequency of the holding member is 1000 [Hz] or less.

18. The glass diaphragm module according to claim 1, wherein the glass plate is a roof glass of a vehicle, and the holding member is a frame member joined to the roof glass.

19. The glass diaphragm module according to claim 1, wherein the first vibrator is installed in a non-transparent portion formed on a part of the glass plate.

20. The glass diaphragm module according to claim 1, wherein the first vibration component is attached within a range of 1.0 [m] or less and 0.01 [m] or more from the end of the glass plate.

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