WO2024117071A1

WO2024117071A1 - Glass diaphragm, glass diaphragm with vibrator, and method for manufacturing glass diaphragm

Info

Publication number: WO2024117071A1
Application number: PCT/JP2023/042325
Authority: WO
Inventors: 大輔内田; 喜一竹内; 順秋山; 幸宏藤原
Original assignee: Ａｇｃ株式会社
Priority date: 2022-12-02
Filing date: 2023-11-27
Publication date: 2024-06-06

Abstract

The present invention provides a glass diaphragm including a glass plate structure and a vibrating section attached to the glass plate structure, wherein the glass plate structure includes a first glass plate, a second glass plate, and an intermediate layer that is sandwiched between the first glass plate and the second glass plate and includes a first intermediate layer and a second intermediate layer, and the first intermediate layer and/or the second intermediate layer includes a plasticizer and has a first region and a second region, which has a lower concentration of the plasticizer than the first region, in a plan view of the glass plate structure.

Description

Glass diaphragm, glass diaphragm with vibrator, and method for manufacturing glass diaphragm

The present invention relates to a glass diaphragm and its manufacturing method, and also to a glass diaphragm with a vibrator.

In recent years, technology has been developed to vibrate various plate-shaped components to function as speakers. Examples of components that can be used as speakers include components for electronic devices, window components for vehicles, and interior components for transport machinery such as vehicles.

For example, Patent Document 1 discloses a speaker device that includes a diaphragm, an exciter, and a vibration transmission section, in which the loss coefficient of the diaphragm and the specific elastic modulus of the vibration transmission section are within a certain range. More specifically, it discloses a configuration in which the exciter is attached to the diaphragm via the vibration transmission section, and the rod holding member is adhesively fixed to the surface of a glass substrate such as an automobile window glass. This allows for excellent design to be achieved without compromising the design of the diaphragm while maintaining acoustic performance.

On the other hand, sound insulation performance may be required for vehicle window components. In response to this, for example, Patent Document 2 discloses that sound transmission loss can be increased by forming laminated glass in which at least two glass sheets are integrated via a thermoplastic resin film impregnated with a plasticizer as a window material for vehicles or buildings.

International Publication No. 2019/172076 International Publication No. 2020/085021

When attempting to use laminated glass with enhanced sound insulation as described above as a diaphragm, the effects of sound pressure suppression due to sound insulation and sound reproduction due to vibration as a glass diaphragm are offset. In other words, there is a trade-off between sound insulation and sound reproduction, and it has been difficult to achieve both.

The present invention therefore aims to provide a glass diaphragm that has good sound insulation within a space and also has good acoustic properties. It also aims to provide a method for manufacturing the glass diaphragm, and a glass diaphragm with a vibrator that has the glass diaphragm.

As a result of extensive research, the inventors discovered that the above problem could be solved by providing two regions with different concentrations of plasticizer in the intermediate layer sandwiched between two glass plates, and thus completed the present invention.

The present invention comprises the following configurations.
[1] A glass plate structure and a vibration unit capable of vibrating the glass plate structure,
The glass plate structure includes a first glass plate, a second glass plate, and an intermediate layer sandwiched between the first glass plate and the second glass plate,
The vibration unit is attached to the glass plate structure,
the intermediate layer includes a first intermediate layer and a second intermediate layer in contact with a main surface of the first intermediate layer,
At least one of the first intermediate layer and the second intermediate layer contains a plasticizer,
A glass diaphragm having, in a plan view of the glass plate structure, a first region and a second region having a lower concentration of the plasticizer than the first region.
[2] A glass diaphragm with a vibrator, comprising the glass diaphragm according to [1] above and a vibrator fixed to the vibrating portion of the glass diaphragm.
[3] Preparing a first glass plate, a second glass plate, a first intermediate layer, and a second intermediate layer;
applying a plasticizer to a partial region of one of the main surfaces of at least one of the first intermediate layer and the second intermediate layer;
stacking the first glass plate, the first intermediate layer, the second intermediate layer, and the second glass plate in this order, and stacking the first intermediate layer and the second intermediate layer such that a main surface of at least one of the first intermediate layer and the second intermediate layer on which the plasticizer is applied faces inward; and
A method for manufacturing a glass diaphragm, comprising the steps of applying pressure and heat treatment in that order.

The present invention provides a glass diaphragm that has good sound insulation within a space and also has good acoustic properties.

FIG. 1 is a schematic cross-sectional view showing an example of a glass diaphragm according to the present embodiment. FIG. 2 is a plan view showing an example of a glass diaphragm according to the present embodiment. FIG. 3 is a plan view showing an example in which the glass sheet structure according to the present embodiment is used as a side glass for a vehicle. FIG. 4 is a plan view showing an example in which the glass sheet structure according to the present embodiment is used as a side glass for a vehicle. FIG. 5 is a plan view showing an example in which the glass sheet structure according to the present embodiment is used as a side glass for a vehicle. FIG. 6 is a plan view showing an example in which the glass sheet structure according to the present embodiment is used as a side glass for a vehicle. FIG. 7 is a plan view showing an example in which the glass sheet structure according to the present embodiment is used as a side glass for a vehicle. FIG. 8 is a plan view showing an example of a glass diaphragm according to the present embodiment. FIG. 9 is a schematic cross-sectional view showing an example of the glass diaphragm according to the present embodiment. FIG. 10 is a schematic cross-sectional view showing an example of a glass diaphragm with a vibrator according to this embodiment.

The present invention will be described in detail below, but the present invention is not limited to the following embodiments, and can be modified as desired without departing from the gist of the present invention. In addition, the use of "~" to indicate a numerical range means that the numerical values before and after it are included as the lower and upper limits.

<Glass diaphragm>
As shown in FIG. 1 , the glass vibration plate 100 according to this embodiment has a glass plate construct 10 and a vibration section 20 that enables the glass plate construct 10 to vibrate, and the vibration section 20 is attached to the glass plate construct 10.
The glass plate construct 10 includes a first glass plate 1, a second glass plate 2, and an intermediate layer 3 sandwiched between the first glass plate 1 and the second glass plate 2. The intermediate layer 3 includes a first intermediate layer 4 and a second intermediate layer 5 in contact with a main surface of the first intermediate layer 4, and at least one of the first intermediate layer 4 and the second intermediate layer 5 includes a plasticizer 6. In FIG. 1, the plasticizer 6 may be included in the thickness direction of the first intermediate layer 4 from a surface where the first intermediate layer 4 and the second intermediate layer 5 are adjacent to each other. In particular, the plasticizer 6 is disposed so as to be included in the thickness direction of one or both of the intermediate layers from an interface where both main surfaces of the first intermediate layer 4 and the second intermediate layer are adjacent to each other.
2, the glass vibration plate 100 has, in a plan view of the glass plate structure 10, a first region A and a second region B having a lower concentration of plasticizer than the first region A. The first region A and the second region B are determined by the concentration of the plasticizer contained in the intermediate layer 3.

The intermediate layer 3 is not particularly limited as long as it includes a first intermediate layer 4 and a second intermediate layer 5 whose principal surfaces are adjacent to each other, and may include an additional layer. In this case, the additional layer may also include a plasticizer, and even in this case, the plasticizer should be arranged so that the additional layer is included in the thickness direction from the principal surface adjacent to the other intermediate layer.

Plasticizers
The plasticizer 6 may be contained in at least one of the first intermediate layer 4 and the second intermediate layer 5. Although Fig. 1 shows an example in which the plasticizer 6 is contained in the first intermediate layer 4, the plasticizer 6 may be contained in both the first intermediate layer 4 and the second intermediate layer 5. Furthermore, when the intermediate layer 3 has a three or more layer configuration including an additional intermediate layer other than the first intermediate layer 4 and the second intermediate layer 5, the plasticizer 6 may also be contained in the additional intermediate layer. From the viewpoint of productivity, it is preferable that the plasticizer 6 is contained in one of the first intermediate layer 4 and the second intermediate layer 5.

The plasticizer 6 may be contained throughout the entire thickness of the first intermediate layer 4, or may be contained to a certain thickness as shown in Fig. 1. From the viewpoint of ensuring stable sound insulation while functioning as a glass diaphragm, it is preferable that the plasticizer 6 is contained to a certain thickness of the first intermediate layer 4. The same applies to the case where the plasticizer 6 is contained in the second intermediate layer 5.
When the plasticizer 6 is contained to a certain thickness of the first intermediate layer 4, it is preferable for the principal surface of the first intermediate layer 4 containing the plasticizer to face the second intermediate layer 5, from the standpoint of preventing the glass diaphragm 100 from shattering.

When the intermediate layer 3 is composed of three or more layers and the plasticizer 6 is contained in the first intermediate layer 4, the first intermediate layer 4 may be formed directly on the first glass plate 1, or the first intermediate layer 4 may be formed on the first glass plate 1 via an intermediate layer that does not contain the plasticizer 6.

The glass diaphragm 100 has a first region A and a second region B with different concentrations of plasticizer 6 when viewed from above in the glass plate structure 10, and thus has good sound insulation within a space while also achieving good acoustics as a diaphragm. This is because the first region A provides good sound insulation within a space, and the second region B provides good acoustics.

The first region A is not particularly limited as long as the concentration of the plasticizer is higher than that of the second region B, but the concentration of the plasticizer 6 in the first region A is preferably 1 mg/mm ² to 100 mg/mm ^2. More specifically, from the viewpoint of better sound insulation in the space, the concentration of the plasticizer 6 is preferably 1 mg/mm ² or more, more preferably 5 mg/mm ² or more, even more preferably 10 mg/mm ² or more, and particularly preferably 20 mg/mm ² or more. In addition, from the viewpoint of the refractive index difference with the second region B, the concentration of the plasticizer 6 is preferably 100 mg/mm ² or less, more preferably 70 mg/mm ² or less, and even more preferably 50 mg/mm ² or less.
In addition, when the concentration of the plasticizer 6 in the first region A is not constant, the above concentration means the average concentration of the plasticizer 6. The average concentration is the average concentration of the plasticizer 6 contained in the entire first region A, and is obtained by dividing the total weight of the plasticizer contained in the entire first region A by the area of the first region A in the plan view of the glass sheet structure 10.

From the viewpoint of vibration controllability, it is preferable that the concentration of the plasticizer 6 in the first region A is constant. Note that, "the concentration of the plasticizer 6 is constant" means that the difference in the concentration (mg/ ^mm2 ) of the plasticizer 6 in the first region A is within ±50% of the average value.

The difference between the average concentration of the plasticizer 6 in the first region A and the average concentration of the plasticizer 6 in the second region B may be more than 0, and is preferably ¹ mg/mm2 or more, and more preferably 1 mg/ ^mm2 to 100 mg/ ^mm2 . More specifically, the difference in concentration is preferably 1 mg/mm2 or more, more preferably ⁵ mg/ ^mm2 or more, even more preferably 10 mg/mm2 ^or more, and particularly preferably 20 mg/mm2 or more, from the viewpoint of separating the region requiring sound insulation performance from the region of sound reproducibility as a glass diaphragm. In addition, the difference in concentration is preferably 100 mg/mm2 or less, more preferably 70 mg/ ^mm2 or less, and even more preferably 50 mg/ ^mm2 or ^less , from the viewpoint of the refractive index difference with the second region ^B.

It is more preferable that the average concentration of the plasticizer in the first region is 1 mg/mm ² to 100 mg/mm ² , and the difference between the average concentration of the plasticizer in the first region and the average concentration of the plasticizer in the second region is 1 mg/mm ² or more.

The concentration of the plasticizer 6 in the second region B may be lower than the concentration of the plasticizer 6 in the first region A, but from the viewpoint of better acoustic properties, it is preferably 10 mg/ ^mm2 or less, more preferably 5 mg/ ^mm2 or less, and even more preferably 1 mg/ ^mm2 or less. In addition, the second region B may not contain a plasticizer, but when a plasticizer is contained, the concentration may be, for example, 1 mg/mm2 or ^more , 5 mg/ ^mm2 or more.
In addition, when the concentration of the plasticizer 6 in the second region B is not constant, the above concentration means the average concentration of the plasticizer 6. The average concentration is the average concentration of the plasticizer 6 contained in the entire second region B, and is obtained by dividing the total weight of the plasticizer contained in the entire second region B by the area of the second region B in the plan view of the glass sheet structure.

From the viewpoint of vibration controllability, it is preferable that the concentration of the plasticizer 6 in the second region B is constant. Note that, "the concentration of the plasticizer 6 is constant" means that the difference in the concentration (mg/ ^mm2 ) of the plasticizer 6 in the second region B is within ±50% of the average value.

The plasticizer 6 is not particularly limited, and a conventionally known plasticizer can be used, for example, an alcohol-based plasticizer, an ether-based plasticizer, an ester-based plasticizer, a phosphorus-based plasticizer, etc. Among them, a plasticizer that can be used in a wide temperature range of about -40°C to 145°C and does not cause foaming, optical distortion, solidification, or a decrease in crack strength is preferable. Specifically, a plasticizer with a high boiling point is preferable, and the boiling point is preferably 100°C or higher, and more preferably 120°C or higher. In addition, a plasticizer with a low freezing point is preferable, and the freezing point is preferably -20°C or lower, and more preferably -40°C or lower.
The plasticizers may be used alone or in combination of two or more kinds.

Alcohol-based plasticizers include ethanol, isopropyl alcohol, ethylene glycol, etc.

Ether plasticizers include diethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, etc.

Ester plasticizers include ethylene glycol di-2-ethylbutyrate, 1,2-propylene glycol di-2-ethylbutyrate, 1,3-propylene glycol di-2-ethylbutyrate, 1,4-butylene glycol di-2-ethylbutyrate, 1,2-butylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylhexanoate, triethylene glycol dicaprylate, and triethylene glycol di-2-ethylpentanoate. , triethylene glycol di-n-heptanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethylpropanoate, tetraethylene glycol di-n-heptanoate, tetraethylene glycol di-2-ethylhexanoate, tetraethylene glycol di-2-ethylbutyrate, dibutyl sebacate, dioctyl azelaate, dihexyl adipate, dioctyl adipate, hexylcyclohexyl adipate, diisononyl adipate, heptylnonyl adipate, di-(2-butoxyethyl)adipate, dibutyl carbitol adipate, mixed adipate esters, and the like. Among these, di-(2-butoxyethyl)adipate (DBEA), triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), and triethylene glycol di-2-ethylpropanoate are preferred, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH), and triethylene glycol di-2-ethylpropanoate are more preferred, triethylene glycol di-2-ethylhexanoate and triethylene glycol di-2-ethylbutyrate are even more preferred, and triethylene glycol di-2-ethylhexanoate is particularly preferred.

Phosphorus-based plasticizers include phosphate esters such as tributoxyethyl phosphate, isodecyl phenyl phosphate, and triisopropyl phosphate.

In other words, it is more preferable that the plasticizer 6 is at least one selected from the group consisting of ether-based plasticizers and ester-based plasticizers.

When the plasticizer 6 is contained in both the first region A and the second region B, it is preferable that the plasticizer 6 in the first region A and the second region B be the same type in order to prevent phase separation.

First Zone, Second Zone
As described above, the first region A and the second region B can be distinguished by the concentration of the plasticizer 6 .
When the second region B does not contain the plasticizer 6 , the first region A and the second region B can be distinguished from each other by the presence or absence of the plasticizer 6 .
Furthermore, even if the second region B also contains plasticizer 6, if the concentration of plasticizer 6 changes discontinuously between the first region A and the second region B, the point where the concentration changes discontinuously can be the boundary between the first region A and the second region B.
In the case where the concentration of the plasticizer 6 changes continuously at the boundary between the first region A and the second region B, the region where the plasticizer concentration is 1 mg/ ^mm2 or more may be defined as the first region A, and the region where the plasticizer concentration is less than 1 mg/ ^mm2 may be defined as the second region B.

In a plan view of the glass plate structure 10, the area ratio _S1 :S2 of the _first region A and the area S2 of the second region B is preferably _1:99 to ₉₉ :1, more preferably 5:95 to 80:20, and even more preferably 10:90 to 60:40, from the viewpoint of achieving both sound insulation and the function as a glass diaphragm.

The glass sheet structure 10 is suitable as a laminated glass for a vehicle, and such a laminated glass for a vehicle may be a slidable or fixed window.
The term "slidable" means that the glass can be opened and closed, and examples of the glass include side glass such as door glass and roof glass for vehicles, and examples of fixed windows include windshields, rear glass, front bench glass, and rear quarter glass.
The glass sheet construct 10 according to the present embodiment may be used for applications other than vehicles, and in that case, the glass sheet construct 10 may be a slidable window or a fixed window.

When the glass plate structure 10 is a side glass 11 for a vehicle, as shown in FIG. 3, the side glass 11 is divided into an upper region C and a lower region D with the belt line BL of the side glass 11 as the boundary. The belt line BL corresponds to the lower edge of the opening when the side glass 11 is attached to the vehicle door and fully closed.

In one embodiment where the glass plate structure 10 is a side glass 11 for a vehicle, as shown in FIG. 4, in a plan view of the glass plate structure 10, the first region A has a portion that is arranged along the periphery of the side glass 11, which is the glass plate structure 10. This is suitable when it is desired to increase the sound insulation within the vehicle space by arranging the first region A in a location where strong wind noise is generated as a countermeasure against wind noise while the vehicle is traveling. In FIG. 4, the first region A is arranged along a portion of the periphery of the side glass 11, but multiple first regions A may be arranged, and the first region A may also be arranged in an internal region other than the periphery.

As shown in Fig. 5, in one embodiment in which the glass plate construct 10 is a side glass 11 for a vehicle, in a plan view of the glass plate construct 10, the first region A is arranged in a loop shape along the periphery of the side glass 11 which is the glass plate construct 10. This is suitable when it is desired to cancel vibrations of external noise.
The term "loop shape" includes a loop shape including a notch. A loop shape including a notch is a shape that has a discontinuous portion with respect to a closed loop shape. When a notch is included, the closed loop shape is not limited to having one notch, and even if there are two or more notches, the overall shape is generally annular, and is included in the term "loop shape including a notch."
In FIG. 5, the first region A is arranged in a loop shape along the periphery of the side glass 11, but the first region A may also be arranged in an internal region other than the periphery.

In one embodiment where the glass plate structure 10 is a side glass 11 for a vehicle, as shown in FIG. 6, in a plan view of the glass plate structure 10, the upper region C may have an arrangement in which the first region A and the second region B are alternately arranged in a direction parallel to the belt line BL. This is suitable when it is desired to smoothly transmit vibrations transmitted from the vibrating part 20 to the second region, and it is preferable to appropriately change the location of the vibrating part 20 and the first region A so that the vibrations transmitted from the vibrating part 20 are not hindered by the first region A as they pass through the second region B.

In FIG. 6, each of the multiple first regions A extending in a direction intersecting the belt line BL does not need to have the same shape or size, and may have any shape or size.
In addition, a first region A may be further arranged along the upper peripheral edge of the side glass 11, and may have a so-called comb-leaf shape that is connected to multiple first regions A extending in a direction intersecting the belt line BL, thereby forming a single continuous first region A.
In addition, the first region A extending in a direction intersecting the belt line BL may be composed of a single continuous region that is not separated from the others, and even in this case, the first region A and the second region B are arranged alternately in a direction parallel to the belt line BL.

In one embodiment where the glass plate structure 10 is a side glass 11 for a vehicle, the first regions A may be arranged in an island shape in a plan view of the glass plate structure 10 as shown in FIG. 7. In addition, the first regions A and the second regions B being alternately arranged in the direction parallel to the belt line BL in the upper region C means that the first regions A and the second regions B are alternately arranged in at least a portion of the region as shown by the dashed line I-I in FIG. 7, and may also include a region where the first regions A and the second regions B are not alternately arranged as shown by the dashed line II-II.

In FIG. 7, the island-like first regions A do not all need to have the same shape and size, and may have any shape and size.
In addition, a plurality of island-shaped first regions A may be connected by other first regions A to form a continuous first region A, and a first region A may be further disposed along the periphery of the side glass 11.
In addition, the island-shaped first region A may be composed of a single continuous region that is not isolated, and in that case, the first region A and the second region B will be arranged alternately in a direction parallel to the belt line BL.

As shown in FIGS. 3 to 7, the arrangement, shape, size, etc. of the first area A and the second area B in the side glass 11 are arbitrary.
Among these, from the viewpoint of quickly transmitting the vibration from the vibrating part to a wide range of the glass plate construct through the second region B, the periphery of the vibrating part is preferably the second region B, and it is preferable to arrange the first region A and the second region B so that the propagation path of the vibration is not obstructed by the first region A. It is also preferable that the second region consists of one continuous region that is not isolated.
On the other hand, it is preferable that the first region A is disposed only within the upper region C from the viewpoint of achieving both sound insulation and the function as a glass diaphragm.

The above describes the case where the glass plate structure 10 is a side glass 11, but the glass diaphragm of this embodiment is very suitable for use in areas other than vehicles, such as glass used in amusement park rides, glass used in recording studios, architectural window glass, and other areas where sound insulation and acoustic properties are required within a space.

<Vibration part>
The vibration section 20 is a member that enables the glass plate construct 10 to vibrate, and is attached to the glass plate construct 10. By attaching a vibrator 30 described later to the vibration section 20, the vibration section 20 has a function of transmitting vibrations caused by the vibrator 30 to the glass plate construct 10 via the vibration section 20.
In Fig. 1, the vibration unit 20 is attached to the first glass plate 1, but the position is not particularly limited as long as it is attached to the glass plate construct 10. For example, the vibration unit 20 may be attached to the intermediate layer 3 by drilling a hole in the first glass plate 1, or may be attached to the main surface of the second glass plate 2 that contacts the intermediate layer 3 by drilling a hole in the first glass plate 1 and the intermediate layer 3. The vibration unit 20 may also be attached so as to have a U-shape in the cross-sectional view of the glass plate construct 10 (see Fig. 1) so as to extend from the outer surface of the first glass plate 1 through the end face of the glass plate construct 10 to the outer surface of the second glass plate 2.

In a plan view of the glass plate structure 10, as shown in Fig. 1, it is preferable that the vibration part 20 is included in the second region B from the viewpoint of propagating vibration to the second region B. Furthermore, depending on the environment during use, such as the temperature, the first region A may be able to propagate vibration, and assuming such a case, a part or the whole of the vibration part 20 may be included in the first region A as shown in Fig. 8.
Furthermore, when there are two or more vibration parts 20, a part or the whole of the vibration parts 20 may be included in both the first region A and the second region B. In this case, different vibrators 30 may be used depending on the environment during use, such as the temperature. Note that using different vibrators 30 may mean using a combination of multiple vibrators 30 with different minimum resonance frequencies _f0 .
In either case, it is preferable that one vibration portion 20 does not straddle both the first region A and the second region B, but is contained within each region.

If the glass plate structure 10 is a side glass 11 for a vehicle, it is preferable from the viewpoint of maintaining a good appearance that the vibration part 20 is attached to the lower region D as shown in Figures 3 to 8.

The vibration section 20 may be directly connected to the vibrator 30, or may be connected to the vibrator 30 via a mount section 21 fixed to the glass plate construct 10 as shown in Fig. 9. The vibration section 20 being directly connected to the vibrator 30 may, for example, be configured such that the vibrator 30 is bonded to the surface of the glass plate construct 10 (first glass plate 1) via only a thin adhesive layer.
The mount portion 21 is included in the vibration portion 20 and is fixed to the glass plate structure 10, and a vibrator can be attached via the mount portion 21.

The mount 21 can be a conventional one, but for example, one side is fixed to the main surface of the glass plate structure 10 with an adhesive layer (not shown) such as an adhesive, and a connection part (not shown) is inserted and fastened to the other side. The vibrator 30 is fixed to the connection part, and the fixing means can be at least one of mechanical fastening methods such as screws, bolts and nuts, rivets, keys, pins, clips, and adhesives.

<<First glass pane, second glass pane>>
Each of the first glass plate 1 and the second glass plate 2 is a glass plate having a pair of opposing main surfaces, and may be made of inorganic glass or organic glass.
The inorganic glass is not particularly limited, but examples thereof include soda-lime glass, aluminosilicate glass, borosilicate glass, alkali-free glass, and quartz glass.
The organic glass is not particularly limited, but examples thereof include transparent resins such as polycarbonate, acrylic resins such as polymethyl methacrylate, polyvinyl chloride, and polystyrene.
The first glass plate 1 and the second glass plate 2 may be made of the same glass or different glasses.

The soda lime glass may have the following molar percentages of each component based on the oxide, but is not limited to these.
50%≦ _SiO2 ≦80%
0.1%≦ _Al2O3 _≦ 25%
3%≦R ₂ O ≦30% (R ₂ O represents the total amount of Li ₂ O, Na ₂ O, and K ₂ O)
0%≦ _B2O3 _≦ 10%
0%≦MgO≦25%
0%≦CaO≦25%
0%≦SrO≦5%
0%≦BaO≦5%
0%≦ _ZrO2 ≦5%
0%≦ _SnO2 ≦5%

The first glass plate 1 and the second glass plate 2 are each preferably a glass plate made of inorganic glass, more preferably a tempered glass plate, from the viewpoint of a high longitudinal wave sound velocity. The tempering treatment may be a chemical tempering treatment or a physical tempering treatment.
Since the first glass plate 1 and the second glass plate 2 form a laminated glass having an intermediate layer sandwiched between them, it is preferable that each of the first glass plate 1 and the second glass plate 2 is a single glass plate.

When the first glass plate 1 and the second glass plate 2 are each a single glass plate, each thickness is preferably independently 0.6 mm to 3.0 mm. More specifically, when the glass plate structure 10 is used in a vehicle, the thickness of the glass plate arranged on the inside of the vehicle is more preferably 0.6 mm to 2.0 mm, and even more preferably 1.2 mm to 1.6 mm, from the viewpoint of ensuring sound insulation in the frequency range of 2000 Hz to 5000 Hz, which is a frequency range of sounds that are easy for people to hear. Furthermore, the thickness of the glass plate arranged on the outside of the vehicle is more preferably 1.6 mm or more, more preferably 2.0 mm or more, and even more preferably 2.2 mm or more, from the viewpoint of impact resistance against flying objects such as pebbles. Furthermore, the thickness of the glass plate arranged on the outside of the vehicle is preferably 3.0 mm or less, preferably 2.5 mm or less, and more preferably 2.1 mm or less, from the viewpoint of weight reduction. Note that each of the above thicknesses does not have to be constant.

From the viewpoint of sound insulation in the frequency range of 2000 Hz to 5000 Hz, the difference in thickness between the first glass plate 1 and the second glass plate 2 is preferably 0.7 mm or less, and more preferably 0.4 mm or less.

The total thickness of the first glass plate 1 and the second glass plate 2 is preferably 4.0 mm or less, more preferably 3.6 mm or less, from the viewpoint of weight reduction. Furthermore, from the viewpoint of rigidity, the total thickness is preferably 2.5 mm or more, more preferably 3.0 mm or more.

The first glass plate 1 and the second glass plate 2 may each be a flat plate or a curved plate. For example, when the glass plate structure 10 is a laminated glass for a vehicle, the main surface of the glass plate located in the outermost layer on the inside of the vehicle space may be curved, or both of the pair of main surfaces may be curved. Also, the main surface of the glass plate located in the outermost layer on the outside of the vehicle may be curved, or both of the pair of main surfaces may be curved. Furthermore, the first glass plate 1 and the second glass plate 2 may be a single curved shape curved in only one direction, or a compound curved shape curved in two different directions.

The first glass plate 1 and the second glass plate 2 may each be chamfered at the peripheral edge. This allows the chamfered surface to scatter ultraviolet light, making it difficult for the plasticizer 6 in the intermediate layer 3 to bleed out. The chamfering is performed, for example, with a rotating grindstone. The chamfered shape is preferably a rounded chamfer shape.

When the first glass plate 1 and the second glass plate 2 each have a curved main surface and the glass plate structure 10 is a laminated glass for a vehicle, the radius of curvature of the curved surface is preferably 800 mm to 80,000 mm. More specifically, from the viewpoint of manufacturing the laminated glass, the radius of curvature is preferably 800 mm or more, more preferably 1,000 mm or more, and even more preferably 2,000 mm or more. Furthermore, from the viewpoint of reducing air resistance, the radius of curvature is preferably 80,000 mm or less, more preferably 50,000 mm or less, and even more preferably 30,000 mm or less.

Middle Class
The intermediate layer 3 includes a first intermediate layer 4 and a second intermediate layer 5. The first intermediate layer 4 and the second intermediate layer 5 containing the plasticizer 6 can be made of a conventionally known material, and for example, a resin film such as polyvinyl butyral resin (PVB), ethylene-vinyl acetate copolymer (EVA), urethane resin, silicone resin, or the like is preferable.

When only one of the first intermediate layer 4 and the second intermediate layer 5 contains the plasticizer 6, the first intermediate layer 4 or the second intermediate layer 5 that does not contain the plasticizer 6 is not limited to the above-mentioned resin film, but may be an ultraviolet ray blocking layer, an infrared ray blocking layer, etc.

The ultraviolet ray blocking layer may be a conventionally known layer, for example a silica film containing an ultraviolet ray absorbent. The infrared ray blocking layer may also be a conventionally known layer, for example a multi-layer structure in which a layer mainly made of silver is sandwiched between dielectric layers.

The intermediate layer 3 may include an additional intermediate layer in addition to the first intermediate layer 4 and the second intermediate layer 5 .
For example, when the first intermediate layer 4 is a resin film containing the plasticizer 6 and the second intermediate layer 5 is a layer other than a resin film without containing the plasticizer 6, it is preferable to select a resin film as the further intermediate layer. In this case, it is preferable to sandwich the second intermediate layer 5 between the first intermediate layer 4 and the further intermediate layer which is a resin film.
The additional intermediate layer may also be the above-mentioned ultraviolet ray blocking layer, infrared ray blocking layer, etc., and the intermediate layer 3 may include two or more additional intermediate layers.
When a plurality of resin films are present as layers constituting the intermediate layer 3, these resin films may be the same or different.

Each layer constituting the intermediate layer 3 may contain an infrared shielding material, an ultraviolet shielding material, a light stabilizer, an antioxidant, etc. These may be conventionally known materials.

The preferred thickness of each layer constituting the intermediate layer 3 varies depending on the composition thereof.
The first intermediate layer 4, the second intermediate layer 5 and the further layers, whether or not they contain a plasticizer 6, preferably each have a thickness of from 80 μm to 450 μm, more preferably from 100 μm to 400 μm.

The total thickness of the intermediate layer 3 is preferably 0.1 mm to 2.0 mm. More specifically, from the viewpoint of sound insulation, the total thickness is preferably 0.1 mm or more, more preferably 0.5 mm or more, and even more preferably 0.7 mm or more. Moreover, from the viewpoint of sound reproducibility as a glass diaphragm, the total thickness is preferably 2.0 mm or less, more preferably 1.5 mm or less, and even more preferably 1.0 mm or less.
The preferred thickness also varies depending on the total thickness of the first glass plate 1 and the second glass plate 2. For example, when the total thickness of the glass plates is 8 mm or more, the total thickness of the intermediate layer 3 is preferably ¼ or less of the total thickness of the glass plates. When the total thickness of the glass plates is less than 6 mm, the total thickness of the intermediate layer 3 is preferably ¼ or less of the total thickness of the glass plates.

At least one of the first intermediate layer 4 and the second intermediate layer 5 contains a plasticizer 6, which is as described above.

"Characteristic"
In the glass vibration plate 100 according to the present embodiment, from the viewpoint of ensuring sufficient visibility, the visible light transmittance in the first region A is preferably 70% or more, more preferably 73% or more, and even more preferably 75% or more. The upper limit of the visible light transmittance is not particularly limited, but is usually 95% or less. The visible light transmittance in this specification is a value measured in accordance with JIS R 3106:1998.

From the viewpoint of ensuring sufficient visibility, the visible light transmittance in the second region B is preferably 70% or more, more preferably 73% or more, and even more preferably 75% or more. There is no particular upper limit to the visible light transmittance, but it is usually 95% or less.

From the viewpoint of improving heat shielding properties, the solar transmittance in the first region A and the solar transmittance in the second region B are each preferably 5% to 60%. More specifically, the solar transmittance is preferably 5% or more, more preferably 35% or more, and is preferably 60% or less, more preferably 55% or less. Note that the solar transmittance in this specification is a value measured in accordance with JIS R 3106:1998.

<Glass diaphragm with vibrator>
As shown in Fig. 10, the glass vibration plate with a vibrator 101 according to this embodiment has a glass vibration plate and a vibrator 30 fixed to a vibration part 20 of the glass vibration plate. The vibrator 30 may be fixed via a mount part 21. The glass vibration plate has a glass plate structure 10 and a vibration part 20, and those described in the above <Glass vibration plate> can be used, and the preferred aspects are also the same.

The vibrator 30 generates sound by applying vibrations to the glass sheet structure 10, and produces an acoustic effect such as generating a desired sound inside a vehicle. The vibrator 30 may be a conventionally known one, but an example would be an exciter that includes a coil section electrically connected to an external device, a magnetic circuit section, and a vibration section.

When an electrical signal is input from an external device to the coil section of the exciter, the interaction between the coil section and the magnetic circuit section generates vibrations, which are then transmitted to the glass plate structure 10. This causes the glass plate structure 10 to generate sound in response to the electrical signal input to the vibrator, supplying sound to the space. A conductive wire that drives the vibrator is attached to the vibrator.

<Method of manufacturing glass diaphragm>
The manufacturing method of the glass vibration plate 100 is not particularly limited, but it can be manufactured by, for example, a method including the following steps 1 to 4 in order. That is, the manufacturing method of the glass vibration plate 100 according to this embodiment includes the following steps 1 to 4.
Step 1: a preparation step of preparing a first glass plate 1, a second glass plate 2, a first intermediate layer 4, and a second intermediate layer 5.
Step 2: a plasticizer application step in which a plasticizer 6 is applied to a partial region of one of the main surfaces of at least one of the first intermediate layer 4 and the second intermediate layer 5.
Step 3: A lamination step in which the first glass plate 1, the first intermediate layer 4, the second intermediate layer 5 and the second glass plate 2 are stacked in that order, and the first intermediate layer 4 and the second intermediate layer 5 are stacked so that the main surface of at least one of the first intermediate layer 4 and the second intermediate layer 5 on which the plasticizer 6 is coated faces inward.
Step 4: A pressurizing and heating step in which pressure and heat treatment are applied.

In the preparation step of step 1, desired materials are selected for each of the first glass plate 1, the second glass plate 2, the first intermediate layer 4, and the second intermediate layer 5, and the materials can be prepared by a conventionally known method. Commercially available materials may be used.
When the intermediate layer 3 includes a layer other than the first intermediate layer 4 and the second intermediate layer 5, a desired material for the additional layer can be selected and prepared by a conventionally known method. These may be commercially available materials.

The first glass plate 1 and the second glass plate 2 may have the same shape or different shapes. The first intermediate layer 4 and the second intermediate layer 5 constituting the intermediate layer 3 may have the same shape or different shapes. If the intermediate layer 3 includes an additional layer, the additional layer may also have the same shape or different shapes as the first intermediate layer 4 and the second intermediate layer 5.

The first intermediate layer 4, the second intermediate layer 5, and the optional further layers constituting the intermediate layer 3 may have the same shape as the first glass plate 1 and the second glass plate 2. In addition, at least a part of the outer peripheral edges of the first intermediate layer 4, the second intermediate layer 5, and the optional further layers may be located inside the outer peripheral edges of the first glass plate 1 and the second glass plate 2 on the entire outer periphery of the glass plate structure 10, or all of the outer peripheral edges of the first intermediate layer 4, the second intermediate layer 5, and the optional further layers may be located inside the outer peripheral edges of the first glass plate 1 and the second glass plate 2.

In the plasticizer coating step of step 2, a plasticizer 6 is coated on a partial region of one main surface of at least one of the first intermediate layer 4 and the second intermediate layer 5. The first intermediate layer 4 and the second intermediate layer 5 to which the plasticizer 6 is coated are preferably resin films.
The method of applying the plasticizer is not particularly limited, and includes application by spraying, dipping, etc. In terms of controlling the amount of the plasticizer 6 applied and the area to be applied, the application method is preferably spraying or application, and more preferably spraying.

Spraying is a method of spraying the plasticizer in a mist, for example, a method in which the plasticizer is diluted in a solvent and the plasticizer 6 is applied to a desired region of the principal surface of the intermediate layer using a spray or the like. The solvent used for dilution is removed by drying or the like.
The solvent used for dilution is preferably a solvent having a boiling point of 100° C. or less, for example, an ether-based solvent or an alcohol-based solvent. Drying for removing the solvent is preferably carried out at a temperature equal to or higher than the boiling point of the solvent, and drying by heating, drying under reduced pressure, drying by heating under reduced pressure, or the like can be used.

Coating refers to a method of coating the surface of the principal surface of the intermediate layer, and examples of such methods include a method in which a plasticizer is diluted in a solvent and then coated in a desired region of the principal surface of the intermediate layer using gravure coating, die coating, screen printing, inkjet printing, etc. The solvent used for dilution is removed by drying or the like.
Immersion is a method of immersing the intermediate layer in a solution containing a plasticizer, and an example of this is a method of applying the plasticizer 6 by immersing a desired region of the intermediate layer in a solution in which the plasticizer is diluted in a solvent using a dip coater. The entire intermediate layer may be immersed by masking areas other than the desired area. The solvent used for dilution is removed by drying or the like.
In the coating or immersion, the solvent used for dilution and the drying for removing the solvent can be the same as those used in the spraying.

When applying the plasticizer 6 to at least one of the first intermediate layer 4 and the second intermediate layer 5, it is preferable to mask a partial area of one of the main surfaces of the layer to be applied in order to control the area to be applied.
The masking method is not particularly limited, and may be performed by a conventionally known method using a conventionally known method.

When the plasticizer 6 is applied to the resin film that is the first intermediate layer 4 or the second intermediate layer 5, the plasticizer 6 penetrates into the resin film. By controlling the amount of application and the temperature, etc., the degree of penetration of the plasticizer 6 in the thickness direction of the resin film can be adjusted.

The region coated with the plasticizer 6 is the first region A, and the region not coated with the plasticizer 6 is the second region B. However, a low-concentration plasticizer 6 may be coated on another region. In that case, the region coated with the low-concentration plasticizer 6 may also be the second region B.
The type and concentration of the plasticizer 6 may be changed as desired, and the plasticizer 6 may be applied multiple times.

The plasticizer 6 may be applied to a portion of one of the main surfaces of at least one of the first intermediate layer 4 and the second intermediate layer 5, but application to both main surfaces is not excluded. However, to achieve the effects of the present invention, application to one of the main surfaces is sufficient, and from the viewpoint of productivity, application to one of the main surfaces is preferable.

In the lamination step of step 3, the first glass plate 1, the first intermediate layer 4, the second intermediate layer 5 and the second glass plate 2 are laminated in that order, and the first intermediate layer 4 and the second intermediate layer 5 are laminated so that the main surface of at least one of the first intermediate layer 4 and the second intermediate layer 5 on which the plasticizer 6 is applied faces inward.

A further intermediate layer other than the first intermediate layer 4 and the second intermediate layer 5 may be laminated. The further intermediate layer may be one layer or two or more layers, and is laminated at least one between the first glass plate 1 and the first intermediate layer 4, and between the second intermediate layer 5 and the second glass plate 2.

As mentioned above, the further intermediate layer may also contain a plasticizer. The further intermediate layer may also be a resin film, or may be an ultraviolet-cutting layer, an infrared-cutting layer, etc.

The first intermediate layer 4, the second intermediate layer 5, and optionally further intermediate layers may be laminated first and integrated into an intermediate layer, and then the first glass plate 1, the intermediate layer 3, and the second glass plate 2 may be laminated in this order.

In the pressurizing and heating step of step 4, the laminate obtained in step 3 is subjected to pressurizing and heating treatment.
The pressure and heat treatment can be performed by a conventional method known in the art. For example, the glass diaphragm can be obtained by pressing in an autoclave or by pressing at about 100° C. to 150° C. and a pressure of 0.6 MPa to 1.5 MPa.

The heating temperature in the pressurization and heat treatment is preferably 120°C or higher, and more preferably 140°C or lower. The pressure in the pressurization and heat treatment is preferably 1.0 MPa or higher, and more preferably 1.3 MPa or lower.

Prior to the above pressure and heat treatment, preliminary adhesion may be carried out.
The preliminary bonding is a method in which the laminate obtained in step 3 is subjected to a pressure treatment to remove air remaining inside the laminate, and then the laminate is pre-baked at a temperature lower than that of the pressure and heat treatment.

The air remaining inside the laminate can be removed by a conventional method, for example, by passing the laminate through a pressure roll or by placing the laminate in a vacuum bag such as a rubber bag and sucking the laminate under reduced pressure.
The conditions for the pre-baking after degassing are not particularly limited, and for example, the pre-baking is carried out at 70° C. to 110° C. to obtain a pre-bonded laminate.

The glass diaphragm, glass diaphragm with vibrator, and method for manufacturing a glass diaphragm according to this embodiment have been described in detail above, but another aspect of the glass diaphragm, glass diaphragm with vibrator, and method for manufacturing a glass diaphragm according to this embodiment is as follows.

[1] A glass plate structure and a vibration unit capable of vibrating the glass plate structure,
The glass plate structure includes a first glass plate, a second glass plate, and an intermediate layer sandwiched between the first glass plate and the second glass plate,
The vibration unit is attached to the glass plate structure,
the intermediate layer includes a first intermediate layer and a second intermediate layer in contact with a main surface of the first intermediate layer,
At least one of the first intermediate layer and the second intermediate layer contains a plasticizer,
A glass diaphragm having, in a plan view of the glass plate structure, a first region and a second region having a lower concentration of the plasticizer than the first region.
[2] The glass diaphragm according to [1], wherein an average concentration of the plasticizer in the first region is 1 mg/mm ² to 100 mg/mm ² .
[3] The glass vibration plate according to [1] or [2], wherein the difference between the average concentration of the plasticizer in the first region and the average concentration of the plasticizer in the second region is 1 mg/ ^mm2 or more.
[4] The glass diaphragm according to any one of [1] to [3], wherein, in a plan view of the glass plate structure, the vibration portion is included within the first region.
[5] The glass diaphragm according to any one of [1] to [4], wherein, in a plan view of the glass plate structure, the vibration portion is included within the second region.
[6] The glass diaphragm according to any one of [1] to [5], wherein the plasticizer is at least one selected from the group consisting of ether-based plasticizers and ester-based plasticizers.
[7] The plasticizer is contained in both the first region and the second region,
The glass diaphragm described in [6], wherein the plasticizer in the first region and the plasticizer in the second region are the same type.
[8] The glass diaphragm according to any one of [1] to [7], wherein the first region has a constant concentration of the plasticizer.
[9] The glass diaphragm according to any one of the above [1] to [8], wherein the vibrating portion includes a mount portion fixed to the glass plate structure.
[10] The glass diaphragm according to any one of [1] to [9], wherein the glass plate structure is a laminated glass for a vehicle.
[11] The glass diaphragm according to the above [10], wherein the laminated glass for a vehicle is slidable.
[12] The laminated glass for a vehicle is a side glass,
When the belt line of the side glass is used as a boundary to divide the upper region and the lower region,
The glass diaphragm according to claim 11, wherein the vibration portion is attached to the lower region.
[13] The glass diaphragm according to [12], wherein in a plan view of the glass plate structure, the first region has a portion that is arranged along a periphery of the glass plate structure.
[14] The glass diaphragm according to [13], wherein the first region is arranged in a loop shape along a periphery of the glass plate structure.
[15] In a plan view of the glass plate structure, in the upper region, the first region and the second region are alternately arranged in a direction parallel to the belt line. The glass diaphragm according to any one of [12] to [14].
[16] The glass diaphragm according to [15], wherein the second region is one continuous region.
[17] The glass diaphragm according to any one of [12] to [16], wherein the first region is disposed only in the upper region.
[18] A glass diaphragm with a vibrator, comprising: the glass diaphragm according to any one of [1] to [17]; and a vibrator fixed to the vibrating portion of the glass diaphragm.
[19] Preparing a first glass plate, a second glass plate, a first intermediate layer, and a second intermediate layer;
applying a plasticizer to a partial region of one of the main surfaces of at least one of the first intermediate layer and the second intermediate layer;
stacking the first glass plate, the first intermediate layer, the second intermediate layer, and the second glass plate in this order, and stacking the first intermediate layer and the second intermediate layer such that a main surface of at least one of the first intermediate layer and the second intermediate layer on which the plasticizer is applied faces inward; and
A method for manufacturing a glass diaphragm, comprising sequentially applying pressure and heat treatment.
[20] The method for manufacturing a glass vibration plate described in [19], wherein when applying the plasticizer, a partial area of the one main surface of at least one of the first intermediate layer and the second intermediate layer is masked and the plasticizer is applied.

Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. This application is based on a Japanese patent application (Patent Application No. 2022-193638) filed on December 2, 2022, the contents of which are incorporated herein by reference.

REFERENCE SIGNS LIST 1 First glass plate 2 Second glass plate 3 Intermediate layer 4 First intermediate layer 5 Second intermediate layer 6 Plasticizer 10 Glass plate structure 11 Side glass 20 Vibrating section 21 Mount section 30 Vibrator 100 Glass diaphragm 101 Glass diaphragm with vibrator A First region B Second region C Upper region D Lower region BL Belt line

Claims

A glass plate structure and a vibration unit that can vibrate the glass plate structure,
The glass plate structure includes a first glass plate, a second glass plate, and an intermediate layer sandwiched between the first glass plate and the second glass plate,
The vibration unit is attached to the glass plate structure,
the intermediate layer includes a first intermediate layer and a second intermediate layer in contact with a main surface of the first intermediate layer,
At least one of the first intermediate layer and the second intermediate layer contains a plasticizer,
A glass diaphragm having, in a plan view of the glass plate structure, a first region and a second region having a lower concentration of the plasticizer than the first region.
2. The glass diaphragm according to claim 1, wherein an average concentration of the plasticizer in the first region is 1 mg/mm 2 to 100 mg/mm 2 .
2. The glass diaphragm according to claim 1, wherein the difference between the average concentration of the plasticizer in the first region and the average concentration of the plasticizer in the second region is 1 mg/ mm2 or more.
The glass vibration plate according to claim 1, wherein, in a plan view of the glass plate structure, the vibration portion is included within the first region.
The glass vibration plate according to claim 1, wherein, in a plan view of the glass plate structure, the vibration portion is included within the second region.
The glass diaphragm according to claim 1, wherein the plasticizer is at least one selected from the group consisting of ether-based plasticizers and ester-based plasticizers.
the plasticizer is contained in both the first region and the second region,
The glass diaphragm of claim 6, wherein the plasticizer in the first region and the second region is the same.
The glass diaphragm of claim 1, wherein the first region has a constant concentration of the plasticizer.
The glass diaphragm according to claim 1, wherein the vibration section includes a mount section fixed to the glass plate structure.
The glass diaphragm according to claim 1, wherein the glass plate structure is a laminated glass for a vehicle.
The glass vibration plate according to claim 10, wherein the laminated glass for a vehicle is slidable.
The laminated glass for a vehicle is a side glass,
When the belt line of the side glass is used as a boundary to divide the upper region and the lower region,
The glass diaphragm according to claim 11, wherein the vibrating portion is attached to the lower region.
The glass diaphragm according to claim 12, wherein, in a plan view of the glass plate structure, the first region has a portion disposed along the periphery of the glass plate structure.
The glass diaphragm according to claim 13, wherein the first region is arranged in a loop shape along the periphery of the glass plate structure.
The glass diaphragm according to claim 12, wherein, in a plan view of the glass plate structure, in the upper region, the first regions and the second regions are arranged alternately in a direction parallel to the belt line.
The glass diaphragm of claim 15, wherein the second region is one continuous region.
The glass diaphragm of claim 12, wherein the first region is disposed only within the upper region.
A glass diaphragm with a vibrator comprising the glass diaphragm according to any one of claims 1 to 17 and a vibrator fixed to the vibrating portion of the glass diaphragm.
Providing a first glass sheet, a second glass sheet, a first interlayer, and a second interlayer;
applying a plasticizer to a partial region of one of the main surfaces of at least one of the first intermediate layer and the second intermediate layer;
stacking the first glass plate, the first intermediate layer, the second intermediate layer, and the second glass plate in this order, and stacking the first intermediate layer and the second intermediate layer such that a main surface of at least one of the first intermediate layer and the second intermediate layer on which the plasticizer is applied faces inward; and
A method for manufacturing a glass diaphragm, comprising the steps of applying pressure and heat treatment in that order.
The method for manufacturing a glass diaphragm according to claim 19, wherein when the plasticizer is applied, a partial area of the main surface of at least one of the first intermediate layer and the second intermediate layer is masked and the plasticizer is applied.