CN117192776A - Vibration isolation structure and head-mounted device - Google Patents
Vibration isolation structure and head-mounted device Download PDFInfo
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- CN117192776A CN117192776A CN202311021604.XA CN202311021604A CN117192776A CN 117192776 A CN117192776 A CN 117192776A CN 202311021604 A CN202311021604 A CN 202311021604A CN 117192776 A CN117192776 A CN 117192776A
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- vibration
- shell
- isolation structure
- vibration isolation
- housing
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- 238000002955 isolation Methods 0.000 title claims abstract description 77
- 239000007779 soft material Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 12
- 238000012856 packing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000005187 foaming Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Abstract
The application discloses a vibration isolation structure and head-mounted equipment, and relates to the technical field of vibration isolation. The vibration isolation structure comprises a shell component and a vibration device, wherein the shell component comprises a first shell, a second shell used for being in contact with a human body and a third shell connected between the first shell and the second shell, and the third shell is made of soft materials; the vibration device is arranged in the shell component, is connected with the second shell and is not contacted with the first shell. On one hand, the second shell is in direct contact with the human body, and vibration is directly transmitted to the human body, so that the transmission efficiency of the vibration is improved; on the other hand, the vibration device is not in contact with the first housing, and the soft third housing absorbs energy in the process of transmitting the vibration energy from the second housing to the first housing, so that the energy transmitted to the first housing is reduced, and the influence of other components connected with the first housing is reduced.
Description
Technical Field
The application relates to the technical field of vibration isolation, in particular to a vibration isolation structure and head-mounted equipment.
Background
In a head-mounted device (e.g., VR/AR head-display), in order to enhance haptic feedback, a vibration motor is typically mounted on the wearable device to enhance immersion. The vibration motor is arranged in the wearing equipment, so that different haptic effects such as collision, vibration, wind blowing and the like can be simulated, a user can feel a more real virtual environment, and a more real and finer immersion experience is provided.
Vibration of the vibration motor, while improving the feel of the user's wearing experience, can also affect other components in the device, which when vibrated can result in overall vibration of the headset, thereby affecting wearing comfort and operational stability of other components, such as can result in shaking of the optics.
In the prior art, a soft vibration isolation pad contacted with a vibration motor is generally arranged for vibration isolation, so that the influence of the vibration motor on other parts of equipment is reduced. However, the vibration isolation method through the vibration isolation pad still has certain defects, on one hand, the vibration device is contacted with other components through the vibration isolation pad, the vibration reduction effect of the vibration isolation pad on the vibration device is limited, the vibration of the vibration motor still can cause the vibration of other components, on the other hand, the vibration energy of the vibration device is transmitted to the skin of a human body after passing through the vibration isolation pad, a part of energy can be lost, and the experience of a user is affected.
There is therefore a need for an improvement over the prior art to overcome the deficiencies described in the prior art.
Disclosure of Invention
The application aims to provide a vibration isolation structure and a head-mounted device, which have better vibration isolation effect.
In order to achieve the above object, the present application provides a vibration isolation structure comprising:
the shell assembly comprises a first shell, a second shell used for being in contact with a human body and a third shell connected between the first shell and the second shell, wherein the third shell is made of soft materials; the method comprises the steps of,
and the vibration device is arranged in the shell assembly, is connected with the second shell and is not contacted with the first shell.
Further, the vibration device further comprises a filling piece filled in the shell assembly, the filling piece is provided with a containing cavity for containing the vibration device, and the vibration device is not in contact with the filling piece.
Further, the filling piece is made of foaming materials, and the Young modulus of the filling piece is 5 MPa-1000 MPa.
Further, the first shell and/or the second shell are/is made of soft materials.
Further, the second shell is made of soft materials, the vibration isolation structure further comprises a connecting sheet connected with the inner surface of the second shell, the vibration device is connected with the connecting sheet, and the connecting sheet is made of hard materials.
Further, the vibration isolation structure comprises at least two vibration devices, and the two vibration devices are connected with the connecting sheet.
Further, the vibration isolation structure comprises at least two connecting pieces, and each connecting piece is connected with at least one vibration device.
Further, the vibration isolation structure comprises a sheet body connected with the vibration device and a vibration isolation piece connected between the sheet body and the filling piece, and the hardness of the vibration isolation piece is smaller than that of the filling piece.
Further, the sheet body and the second housing are respectively connected to two ends of the vibration device, and the sheet body is provided with a suspension portion between the filling member and the vibration device.
Further, the Young's modulus of the connecting sheet is 100GPa to 250GPa.
Further, the connecting piece is provided with a hollowed-out hole.
In another aspect, the application proposes a head-mounted device comprising a bone conduction sound emitting unit as described in any one of the preceding claims.
Further, the head-mounted device comprises a rear end bin body which is arranged opposite to the rear side of the human body when the head-mounted device is worn, and the first shell of the vibration isolation structure is connected with the rear end bin body.
Compared with the prior art, the application has the following beneficial effects: the vibration isolation structure comprises a shell component and a vibration device, wherein the shell component comprises a first shell, a second shell used for being in contact with a human body and a third shell connected between the first shell and the second shell, and the third shell is made of soft materials; the vibration device is directly connected with the second housing, and the vibration is directly transmitted to the human body through the second housing, so that the vibration transmission efficiency is improved, and the loss in the process of transmitting the vibration to the human body is reduced; on the other hand, the vibration device is not in contact with the first shell, and a large amount of vibration energy can be consumed by the soft third shell in the process of transmitting the vibration energy from the second shell to the first shell, so that the vibration energy transmitted to the first shell is greatly reduced, and the influence on other components connected with the first shell is reduced.
Drawings
Fig. 1 is an exploded view of a vibration isolation structure according to an embodiment of the present application.
Figure 2 is a cross-sectional view of a vibration isolation structure according to one embodiment of the present application.
Figure 3 is a cross-sectional view of a vibration isolation structure according to one embodiment of the present application.
Fig. 4 is a cross-sectional view of a vibration isolation structure according to an embodiment of the present application.
Fig. 5 is a structural view of a filler of a vibration isolation structure according to an embodiment of the present application.
Fig. 6 is an exploded view of a vibration isolation structure according to an embodiment of the present application.
Fig. 7 is an exploded view of a vibration isolation structure according to an embodiment of the present application.
Fig. 8 is a cross-sectional view of a vibration isolation structure according to an embodiment of the present application.
Fig. 9 is a structural view of a connecting piece of a vibration isolation structure according to an embodiment of the present application.
Figure 10 is a block diagram of a connection tab of a vibration isolation structure according to one embodiment of the present application.
Fig. 11 is an exploded view of a vibration isolation structure according to an embodiment of the present application.
Fig. 12 is a cross-sectional view of a vibration isolation structure according to an embodiment of the present application.
Fig. 13 is an exploded view of a headset according to one embodiment of the present application.
Fig. 14 is a cross-sectional view of a head mounted device in accordance with one embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "comprising" and "having" and any variations thereof herein are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
As shown in fig. 1 and 2, a vibration isolation structure corresponding to an embodiment of the present application includes a housing assembly 1 and a vibration device 2.
The housing assembly 1 comprises a first shell 10, a second shell 11 for contacting a human body and a third shell 12 connected between the first shell 10 and the second shell 11, wherein the third shell 12 is made of soft materials, the first shell 10 and the second shell 11 are connected through the third shell 12, and a first inner cavity 13 is formed by cooperation among the first shell 10, the second shell 11 and the third shell 12.
The vibration device 2 is disposed in the housing assembly 1, i.e. in the first cavity 13, and the vibration device 2 is connected to the second housing 11 and is not in contact with the first housing 10.
When the vibration device 2 works, the second shell 11 is in contact with a human body, so that the vibration generated by the vibration device 2 is directly transmitted to the human body through the second shell 11, the energy loss of the vibration in the transmission process is reduced, and the vibration transmission efficiency is higher; meanwhile, the vibration device 2 is not in contact with the first casing 10, and is connected between the first casing 10 and the second casing 11 through the soft third casing 12, and when vibration energy is transmitted to the third casing 12 through the second casing 11, the third casing 12 can absorb a large amount of vibration energy, so that vibration of the vibration device 2 is difficult to transmit to the first casing 10, the influence of the vibration device 2 on the first casing 10 is reduced, and the vibration isolation effect is better. It will be appreciated that when connected to other components by the first housing 10, the effect of the vibration device 2 on the other components will be substantially reduced.
In some embodiments, the vibration isolation structure is mounted on the head-mounted device, as shown in fig. 13 and 14, the head-mounted device includes a rear-end housing 6, a front-end display device (not shown) and a connection portion 60 connected between the rear-end housing 6 and the front-end display device, the connection portion 60 may be, for example, a flexible strap or a hard link-shaped member, the vibration isolation structure is disposed corresponding to the rear end of the head, the first housing 10 is connected to the rear-end housing 6, and the second housing 11 is disposed in a concave arc shape so as to be fitted to the rear side of the head of a person, so as to improve the comfort of use. Because the vibration energy of the vibration device 2 is difficult to transfer to the first housing 10, the vibration energy is also difficult to transfer to the rear end bin body 6, the connecting portion and the front end display device, the integral vibration of the head-mounted equipment is effectively reduced, and the normal operation of the electronic components in the rear end bin body 6, the connecting portion and the front end display device is less affected.
The third housing 12 is preferably annular and is connected to the outer edges of the first housing 10 and the second housing 11. The third housing 12 may also be sheet-shaped, for example, attached only to the left and right sides of the first housing 10 and the second housing 11. The third housing 12 and the first housing 10 may be two parts that are connected or may be one piece, and, referring to fig. 3, the third housing 12 and the first housing 10 may be smoothly transitioned, not necessarily have a distinct turn or junction as in fig. 2.
The third housing 12 may be made of leather, cloth, or other soft material, for example. The first and second cases 10 and 11 may be made of soft or hard materials, and one of them may be made of soft materials and the other of them may be made of hard materials. Preferably, the first housing 10 and the second housing 11 are both made of soft materials, and more preferably, they are made of the same material as the third housing 12. In this way, a better vibration reduction effect can be achieved, and the soft second housing 11 is more comfortable when it is in contact with the human body.
In order that the first housing 10 does not contact the vibration device 2 when being worn, in some embodiments, the first inner cavity 13 is a closed inner cavity and is filled with gas at a certain pressure, so that the shape of the first inner cavity 13 can be maintained by air pressure, and is not easy to deform and move towards the vibration device 2 to contact the vibration device 2 under the action of external force, thus ensuring the reliability of the vibration reduction effect.
In other embodiments, as shown in fig. 4 to 6, the vibration isolation structure further includes a filler 3 filled in the case assembly 1, and the shape of the case assembly 1 is maintained by the filler 3. The packing 3 can play a supporting role for the case assembly 1, and can maintain the shape of the case assembly 1 by its own shape, preventing the first case 10 from contacting the vibration device 2, even if the first case 10, the second case 11, and the third case 12 are all made of soft materials.
As shown in fig. 4 and 5, the packing 3 is provided with a receiving cavity 30 for receiving the vibration device 2, and the vibration device 2 is not in contact with the packing 3, thereby avoiding that the vibration generated by the vibration device 2 is directly transmitted to the first housing 10 through the packing 3, and guaranteeing the vibration isolation effect.
As a preferred embodiment, the filling member 3 is made of a foaming material, the young modulus of the filling member 3 is 5-1000 MPa, and the filling member 3 in the young modulus range can effectively absorb the vibration generated by the vibration device 2 while meeting the supporting effect, thereby reducing the influence of the vibration on other components.
In some embodiments, as described above, the second housing 11 may be made of a soft material, thereby improving wearing comfort for the user, and in addition, the soft material has a function of absorbing vibration, reducing propagation of vibration to the third housing 12 and the filler 3, so that only a portion of the head corresponding to the vibration device 2 can feel significant vibration when the second housing 11 is made of a soft material. In order to improve the vibration effect, as shown in fig. 4, the vibration isolation structure further includes a connection piece 4 connected to the inner surface 110 of the second housing 11, the vibration device 2 is connected to the connection piece 4, and the connection piece 4 is made of hard materials, so that the effect of fixing and transmitting vibration can be achieved, and thus, the connection piece 4 can uniformly transmit the vibration generated by the vibration device 2 to a human body through the second housing 11, the vibration area is larger, and the experience of a user can be improved. For example, in some embodiments, the connecting piece 4 is a rigid material such as a rigid plate, spring plate, or hairspring.
As shown in fig. 2 and 4, the vibration device 2 preferably generates linear vibration, and the vibration direction a of the vibration device is perpendicular to the surface of the connecting piece 4 and is directly directed to the human body, so that the vibration feeling felt by the human body is enhanced.
The number of the vibration devices 2 is not limited, and may be one, two or more. In some embodiments, the vibration isolation structure includes at least two vibration devices 2, where both vibration devices 2 are connected to the connecting piece 4, and as a preferred embodiment, the vibration devices 2 are symmetrically disposed, so as to enhance the wearing experience of the user. As shown in fig. 4 and 6, in the embodiment shown in fig. 6, the vibration isolation structure includes two vibration devices 2, and the two vibration devices 2 are symmetrically disposed.
The number of the connecting pieces 4 is not limited and may be one, two or more. In some embodiments, the vibration isolation structure comprises at least two connecting pieces 4, and each connecting piece 4 is connected with at least one vibration device 2, so that the vibration of each connecting piece 4 is controlled by the vibration device 2 on the connecting piece, and vibration control of different areas can be realized, so that the tactile feedback is richer. As shown in fig. 7 and 8, in the embodiment shown in fig. 7 and 8, the vibration isolation structure includes two connection pieces 4, each connection piece 4 is provided with one vibration device 2, and vibration sense can be generated in different areas of the second housing 11 by controlling the vibration device 2 to vibrate.
As a preferred embodiment, the young's modulus of the connecting piece 4 is 100GPa to 250GPa, so as to reliably transmit vibration, reduce the loss of the vibration generated by the vibration device 2 in the transmission process to the human body, and improve the experience of the user.
As a preferred embodiment, the connecting piece 4 is provided with a hollowed-out hole 41, the hollowed-out hole 41 can reduce the sound radiation area, reduce the radiation sound production, avoid noise from affecting the user experience, and simultaneously, can reduce the weight of the vibration isolation structure and improve the wearing comfort of the user. The number of the hollow holes 41 is not limited, and preferably, the connecting sheet 4 is provided with a plurality of hollow holes distributed in an array. As shown in fig. 9 and 10, the shape of the hollowed-out hole 41 is not limited, and may be, for example, circular or square.
The vibration device 2 is arranged in a suspended manner in the accommodating chamber 30, and can also be connected with the filling member 3 through a vibration damping structure. As shown in fig. 11 and 12, the vibration isolation structure includes a sheet body 7 connected to the vibration device 2 and a vibration isolator 5 connected between the sheet body 7 and the filler 3. The vibration generated by the vibration device 2 is transmitted to the vibration isolation member 5 through the sheet 7, and in a preferred embodiment, the hardness of the vibration isolation member 5 is smaller than that of the filling member 3, i.e., the vibration isolation member 5 is softer than that of the filling member 3, and at this time, the vibration isolation member 5 absorbs part of the vibration, and a good vibration isolation effect is achieved through double vibration reduction of the vibration isolation member 5 and the filling member 3.
As shown in fig. 11 and 12, the sheet 7 and the second housing 11 are respectively connected to both ends of the vibration device 2, and the sheet 7 has a suspended portion 70 between the filler 3 and the vibration device 2, so that the sheet 7 is not in direct contact with the filler 3, and the vibration isolation effect is better. Further preferably, the vibration device 2 generates linear vibration, and the vibration direction is perpendicular to the length direction of the sheet 7 and is directed to the side where the human body is located, so that the vibration transmitted to the filler 3 through the sheet 7 can be further reduced.
The sheet 7 is preferably made of the same material as the connecting piece 4 and has a certain elasticity.
It will be appreciated that in the embodiment shown in fig. 11 and 12, a connecting piece 4 may also be provided between the vibration device 2 and the second housing 11.
The application also proposes a head-mounted device comprising a vibration isolation structure as described above.
As shown in fig. 13 and 14, the head-mounted device further includes a rear-end housing 6 disposed opposite to the rear side of the human body when worn, a front-end display device (not shown) disposed opposite to the front of the human body, and a connection portion 60 connected between the rear-end housing 6 and the front-end display device, and the first housing 10 of the vibration isolation structure is connected to the rear-end housing 6, so that the user can adjust wearing comfort through the rear-end housing 6. When worn, the second housing 11 is in contact with the human head. Since the vibration generated by the vibration device 2 is hardly transmitted to the first housing 10 through the second housing 11, the influence on the rear-end bin 6, the front-end display device and the connection portion 60 is small, the overall vibration of the apparatus is not easily caused, and the reliability of the operation of the electronic components in the apparatus is advantageously improved.
The head-mounted device may be, for example, VR glasses, AR head-mounted, etc.
The foregoing is merely exemplary of the application and other modifications can be made without departing from the scope of the application.
Claims (13)
1. A vibration isolation structure, comprising:
a housing assembly (1) comprising a first shell (10), a second shell (11) for contacting a human body and a third shell (12) connected between the first shell (10) and the second shell (11), wherein the third shell (12) is made of soft materials; the method comprises the steps of,
and the vibration device (2) is arranged in the shell assembly (1), is connected with the second shell (11), and is not contacted with the first shell (10).
2. The vibration isolation structure according to claim 1, further comprising a filler member (3) filled in the housing assembly (1), the filler member (3) being provided with a receiving cavity (30) for receiving the vibration device (2), the vibration device (2) not being in contact with the filler member (3).
3. Vibration isolation structure according to claim 2, characterized in that the filler (3) is made of a foamed material, the young's modulus of the filler (3) being between 5MPa and 1000MPa.
4. The vibration isolation structure according to claim 1, characterized in that the first housing (10) and/or the second housing (11) are made of a soft material.
5. A vibration isolation structure according to any one of claims 1 to 4, wherein the second housing (11) is made of a soft material, the vibration isolation structure further comprising a connecting piece (4) connected to the inner surface (110) of the second housing (11), the vibration device (2) being connected to the connecting piece (4), the connecting piece (4) being made of a hard material.
6. A vibration isolation structure according to claim 5, characterized in that it comprises at least two vibration means (2), both vibration means (2) being connected to the connecting piece (4).
7. A vibration isolation structure according to claim 5, characterized in that the vibration isolation structure comprises at least two connection pieces (4), each connection piece (4) being connected with at least one vibration device (2).
8. A vibration isolation structure according to claim 2 or 3, characterized in that the vibration isolation structure comprises a blade body (7) connected to the vibration device (2) and a vibration isolation member (5) connected between the blade body (7) and the filler member (3), the hardness of the vibration isolation member (5) being smaller than the hardness of the filler member (3).
9. A vibration isolation structure according to claim 8, wherein the sheet body (7) and the second housing (11) are connected to both ends of the vibration device (2), respectively, and the sheet body (7) has a suspended portion (70) between the filler (3) and the vibration device (2).
10. Vibration isolation structure according to claim 5, characterized in that the young's modulus of the connecting piece (4) is 100GPa to 250GPa.
11. Vibration isolation structure according to claim 5, characterized in that the connecting piece (4) is provided with a hollowed-out hole (41).
12. A head-mounted device comprising a vibration isolation structure according to any one of claims 1 to 11.
13. The head-mounted device according to claim 12, characterized in that the head-mounted device comprises a rear-end housing body arranged opposite to the rear side of the human body when worn, and the first housing (10) of the vibration isolation structure is connected to the rear-end housing body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311021604.XA CN117192776A (en) | 2023-08-15 | 2023-08-15 | Vibration isolation structure and head-mounted device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311021604.XA CN117192776A (en) | 2023-08-15 | 2023-08-15 | Vibration isolation structure and head-mounted device |
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| Publication Number | Publication Date |
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| CN117192776A true CN117192776A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311021604.XA Pending CN117192776A (en) | 2023-08-15 | 2023-08-15 | Vibration isolation structure and head-mounted device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105007551A (en) * | 2015-08-13 | 2015-10-28 | 深圳市韶音科技有限公司 | Method for improving sound quality of bone conduction earphone and bone conduction earphone |
| CN108243377A (en) * | 2018-03-30 | 2018-07-03 | 陈火 | A kind of low drain sound bone-conduction speaker unit |
| CN210199407U (en) * | 2019-07-15 | 2020-03-27 | 北京七展国际数字科技有限公司 | Intelligence AR head-mounted apparatus |
| CN111025652A (en) * | 2019-12-29 | 2020-04-17 | 青岛歌尔声学科技有限公司 | VR head-mounted apparatus |
| US20200336824A1 (en) * | 2018-06-15 | 2020-10-22 | Shenzhen Voxtech Co., Ltd. | Apparatus and methods for bone conduction speaker |
| CN214355671U (en) * | 2019-05-06 | 2021-10-08 | 陈明 | Bone conduction seat headrest |
| CN217521584U (en) * | 2022-01-19 | 2022-09-30 | 广州视源电子科技股份有限公司 | Vibration feedback device, touch control equipment, vehicle-mounted central control display device and conference tablet |
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- 2023-08-15 CN CN202311021604.XA patent/CN117192776A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105007551A (en) * | 2015-08-13 | 2015-10-28 | 深圳市韶音科技有限公司 | Method for improving sound quality of bone conduction earphone and bone conduction earphone |
| CN108243377A (en) * | 2018-03-30 | 2018-07-03 | 陈火 | A kind of low drain sound bone-conduction speaker unit |
| US20200336824A1 (en) * | 2018-06-15 | 2020-10-22 | Shenzhen Voxtech Co., Ltd. | Apparatus and methods for bone conduction speaker |
| CN214355671U (en) * | 2019-05-06 | 2021-10-08 | 陈明 | Bone conduction seat headrest |
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