CN207427452U - Electroacoustic transducer - Google Patents
Electroacoustic transducer Download PDFInfo
- Publication number
- CN207427452U CN207427452U CN201721431784.9U CN201721431784U CN207427452U CN 207427452 U CN207427452 U CN 207427452U CN 201721431784 U CN201721431784 U CN 201721431784U CN 207427452 U CN207427452 U CN 207427452U
- Authority
- CN
- China
- Prior art keywords
- shell
- barricade
- vibrating diaphragm
- seal ring
- elastic seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model embodiment provides a kind of electroacoustic transducer.The electroacoustic transducer includes：Vibrational system, elastic seal ring and the shell for accommodating the fixed vibrational system；The shell includes first shell and the second shell being connected in the first shell；The vibrational system includes vibrating diaphragm, and the vibrating diaphragm includes the fixed part being fixed between the first shell and the second shell；The end face being connected with the vibrating diaphragm of the first shell is equipped with round groove；The elastic seal ring is partly contained in the round groove；When the fixed part is fixed in the first shell, the fixed part squeezes the elastic seal ring so that the elastic seal ring is in compressive state.Electroacoustic transducer provided by the utility model has reliable water resistance.
Description
Technical field
The utility model belongs to electro-acoustic conversion device technical field, and specifically, the utility model is related to a kind of conversions of electroacoustic
Device.
Background technology
Electroacoustic transducer is the device for converting electrical energy into acoustic energy, such as：Loud speaker, being played in sound place system can not
Or scarce effect.Electroacoustic transducer is most weak device in sound place system, and for sound puts effect, it is one again
Most important component.
At present, to meet the requirement of the performance of electroacoustic transducer or its terminal device applied and reliability, increasingly
More product requirements has water-proof function.The common waterproof construction of current speaker is barricade waterproof construction, by shell
Gluing is sealed in the space that barricade is formed with protecgulum, and the realization of water resistance fully relies on the waterproof around product surrounding
Fluid sealant is realized, and this waterproof gasket cement in periphery is washed away in long-time contact water and by water, is susceptible to de-
Phenomena such as falling so as to cause seal failure, has some limitations in terms of product reliability.
Utility model content
One purpose of the utility model is to improve waterproof reliability, ensures that electroacoustic transducer performance is stablized.
One side according to the present utility model provides a kind of electroacoustic transducer.The electroacoustic transducer, including：Vibration
System, elastic seal ring and the shell for accommodating the fixed vibrational system；The shell includes first shell and company
The second shell being connected in the first shell；The vibrational system includes vibrating diaphragm, and the vibrating diaphragm includes being fixed on described first
Fixed part between housing and the second shell；It is recessed that the end face being connected with the vibrating diaphragm of the first shell is equipped with round
Slot；The elastic seal ring is partly contained in the round groove；When the fixed part is fixed in the first shell,
The fixed part squeezes the elastic seal ring so that the elastic seal ring is in compressive state.
Optionally, the outer side surface of the second shell is concordant with the outer side surface of the first shell.
Optionally, the outer side surface of the first shell forms the first exposed junction beyond the outer side surface of the second shell
Face；Extend the first barricade from first exposed junction towards the second shell direction；First barricade and described second
There are the first gaps between the outer side surface of housing；Fluid sealant is filled in first gap.
Optionally, the side of the direction second shell of first barricade is slope so that first barricade
Upper end is narrower than lower end.
Optionally, the second barricade, the second gear are additionally provided on the end face being connected with the vibrating diaphragm of the first shell
The height of wall is less than first barricade；The upper surface of the elastic seal ring is higher by the upper surface of second barricade；It is described
Second barricade lifts the vibrating diaphragm, the end being connected with the vibrating diaphragm of the first shell in the outside of the elastic seal ring
The second gap is formed between face and the fixed part of the vibrating diaphragm；Second gap and first gap area.
Optionally, the elastic seal ring be arranged on second barricade or against second barricade towards institute
The sidewall edge for stating the first barricade is set.
Optionally, protrusion is provided with multiple hot melts at the periphery of the end face being connected with the vibrating diaphragm of the first shell
Column；When the second shell lid close when in the first shell, by heat the hot molten column be connected the first shell and
The second shell.
Optionally, the edge of the second shell is equipped with step-like notch corresponding with the hot molten column.
Optionally, the center position of the second shell is provided with out acoustic aperture；Described in the central part alignment of the vibrating diaphragm
Go out acoustic aperture setting.
Optionally, the vibrating diaphragm further includes ring portion；The ring portion is set around the central part；The fixed part encloses
It is set around the ring portion.
Other side according to the present utility model provides a kind of electroacoustic transducer.The electroacoustic transducer, including：
Vibrational system, elastic seal ring and the shell for accommodating the fixed vibrational system；The shell include first shell with
And it is connected to the second shell in the first shell；The vibrational system includes vibrating diaphragm, and the vibrating diaphragm includes being fixed on described
Fixed part between first shell and the second shell；The end face being connected with the vibrating diaphragm of the second shell is equipped with circle
Shape groove；The elastic seal ring is partly contained in the round groove；The fixed part is fixed on the second shell
When upper, the fixed part squeezes the elastic seal ring so that the elastic seal ring is in compressive state.
Optionally, the outer side surface of the first shell forms the first exposed junction beyond the outer side surface of the second shell
Face；Extend the first barricade from first exposed junction towards the second shell direction；First barricade and described second
There are the first gaps between the outer side surface of housing；Fluid sealant is filled in first gap.
In the technical solution that the utility model embodiment provides, elastic seal ring is located at the first shell being connected with each other and the
The junction of two housings, under the compressing of first shell and second shell, the elastic seal ring compressive deformation generates reaction
Power, it is achieved thereby that the sealing of the junction of first shell and second shell.Since elastic seal ring is clamped at first shell
Between second shell, the problem of there is no contacting with water or being washed away by water, coming off because of elastic seal ring is also avoided
The problems such as caused waterproof failure.Compared with prior art, electroacoustic transducer provided by the utility model uses waterproof construction
Reliable water resistance is capable of providing, ensures that electroacoustic transducer performance is stablized.
By referring to the drawings to the detailed description of the exemplary embodiment of the utility model, the utility model it is other
Feature and its advantage will become apparent.
Description of the drawings
The attached drawing of a part for constitution instruction describes the embodiment of the utility model, and uses together with the description
In the principle for explaining the utility model.
Fig. 1 is the sectional view for the electroacoustic transducer that one embodiment of the utility model provides；
Fig. 2 is the explosive view for the electroacoustic transducer that one embodiment of the utility model provides；
Fig. 3 is the sectional view for the electroacoustic transducer that another embodiment of the utility model provides；
Fig. 4 is the explosive view for the electroacoustic transducer that another embodiment of the utility model provides.
Specific embodiment
The various exemplary embodiments of the utility model are described in detail now with reference to attached drawing.It should be noted that：It is unless another
It illustrates outside, the component and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments is unlimited
The scope of the utility model processed.
It is illustrative to the description only actually of at least one exemplary embodiment below, is never used as to this practicality
New and its application or any restrictions used.
It may be not discussed in detail for technology and equipment known to person of ordinary skill in the relevant, but in appropriate situation
Under, the technology and equipment should be considered as part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.
Fig. 1 is the sectional view for the electroacoustic transducer that one embodiment of the utility model provides.As shown in Figure 1, vibrational system, bullet
Property the sealing ring 3 and shell for accommodating the fixed vibrational system；The shell includes first shell 1 and is connected to institute
State the second shell 2 in first shell 1；The vibrational system includes vibrating diaphragm 4, and the vibrating diaphragm 4 includes being fixed on the first shell
Fixed part 41 between body 1 and the second shell 2；The end face being connected with the vibrating diaphragm 4 of the first shell 1 is equipped with circle
Shape groove 11；The elastic seal ring 3 is partly contained in the round groove 11；The fixed part 41 is fixed on described
When on one housing 1, the fixed part 41 squeezes the elastic seal ring 3 so that the elastic seal ring 3 is in compressive state.
As shown in Fig. 2, the round groove 11 is located on the end face being connected with the vibrating diaphragm 4 of the first shell 1, and
Positioned at 41 junction of fixed part with the vibrating diaphragm 4.Since the thickness of elastic seal ring 3 is higher than the depth of the round groove 11
Degree, therefore, the elastic seal ring 3 is partly contained in the round groove 11, and the upper surface of the elastic seal ring is high
Go out on the end face being connected with the vibrating diaphragm 4 of the first shell 1.In encapsulation, first the fixed part of the vibrating diaphragm 4 can be passed through
Viscose glue is connected in the second shell 2, is closed second shell 2 is covered in the first shell 1 so that the vibrating diaphragm 4
Fixed part 41 is clamped between the first shell and second shell.When it is implemented, the first shell 1 and second shell 2
It can be realized and connected by snap.After the first shell 1 and second shell 2 fasten, the elastic seal ring 3 is in vibrating diaphragm
With generating elastic deformation under the extruding of first shell 1, the sealing for realizing first shell 1 and second shell connects 4 fixed part 41
It connects.The round groove 11 can be rectangular recess.
In the technical solution that the utility model embodiment provides, elastic seal ring is located at the first shell being connected with each other and the
The junction of two housings, under the compressing of first shell and second shell, the elastic seal ring compressive deformation generates reaction
Power, it is achieved thereby that the sealing of the junction of first shell and second shell.Since elastic seal ring is clamped in first shell
Between body and second shell, the problem of there is no contacting with water or being washed away by water, also avoid de- because of elastic seal ring
Caused by falling the problems such as waterproof failure.Compared with prior art, electroacoustic transducer provided by the utility model uses waterproof knot
Structure is capable of providing reliable water resistance, ensures that electroacoustic transducer performance is stablized.
At present, the volume of Microspeaker is less and less, under the requirement of smaller size smaller, also need to ensure sound put effect and
Reliable water proofing property.Due to being to realize water resistance using barrier wall structure in the prior art, for Microspeaker, barricade
Structure occupies larger space, and inside loudspeakers respective magnetic circuit system proportioning and vibrational system is caused effectively to vibrate area etc.
It is all restricted, causes the loss of loud speaker acoustical behavior apparent, decline including sensitivity etc..Therefore, carried based on above-described embodiment
The waterproof construction of confession can be set the outer side surface of second shell 2 is concordant with the outer side surface of the first shell 1.Such as Fig. 1 institutes
Show, the outer side surface of the second shell 2 is concordant with the outer side surface of the first shell 1.
In the construction shown in fig. 1, barrier wall structure is avoided, also just accordingly adds inside loudspeakers respective magnetic circuit system
Effective vibration area of proportioning and vibrational system, realizes under smaller size smaller, ensure that sound puts effect and water proofing property
Reliability.
In another embodiment, as shown in figure 3, the outer side surface of the first shell 1 is beyond the outer of the second shell 2
Side wall surface forms the first exposed end face；Extend the first barricade from first exposed junction towards 2 direction of second shell
201；There are the first gaps 100 between first barricade 201 and the outer side surface of the second shell 2；First gap
Fluid sealant is filled in 100.
In the present embodiment, dual waterproof is accomplished by elastic seal ring and fluid sealant, effectively increases loud speaker
Water resistance.
Further, the side of the direction of first barricade 201 second shell 2 is slope so that described the
One barricade, 201 upper end is narrower than lower end.Set the slope that can be guided close in first gap 100 during filling with sealant
Sealing flows into the intersection of first shell 1 and second shell 2, to improve the sealing effect of fluid sealant.
In a kind of achievable scheme, second is additionally provided on the end face being connected with the vibrating diaphragm 4 of the first shell 1
Shelves wall 202, the height of second barricade 202 are less than first barricade 201；The upper surface of the elastic seal ring 3 is higher by
The upper surface of second barricade 202；Second barricade 202 lifts the vibrating diaphragm 4, in the outer of the elastic seal ring 3
The second seam is formed between the end face being connected with the vibrating diaphragm 4 of first shell 1 described in side and the fixed part 41 of the vibrating diaphragm 4
Gap 200；Second gap 200 is connected with first gap 100.
Filled with fluid sealant in second gap 200, the fluid sealant in the second gap 200 is flowed into, it can volume after curing
Expansion generates certain pressure to vibrating diaphragm and first shell, further improves water resistance.And positioned at the second gap 200
In fluid sealant completely cut off by the fluid sealant filled in the first gap 100 and outside air, avoid the wind for being washed away and coming off by water
Danger.
Preferably, it is slope by the side of the direction of first barricade 201 second shell 2 so that described the
One barricade, 201 upper end is narrower than lower end.It is flowed to by the bootable fluid sealant of slope in second gap 200.
Further, the elastic seal ring 3 is arranged on second barricade 202 or againsts second barricade 202
Direction first barricade 201 sidewall edge set.The round groove 11 is located at the upper surface of second barricade 202
Or it is set along at the sidewall edge of direction first barricade 201 of second barricade 202.As shown in Figure 3 and Figure 4, institute
The sidewall edge for stating direction first barricade 201 that elastic seal ring 3 againsts second barricade 202 is set, the round
It is set at the sidewall edge of direction first barricade 201 of groove 11 along second barricade 202, close from the elasticity
The outside of seal 3 is to the 201 place section of the first barricade, between the fixed part 41 of the vibrating diaphragm 4 and the first shell 1
Reserve the second gap 200.
In the present embodiment, using the combining structure of elastic seal ring and double waterproof barricades, dual waterproofing protection work(is realized
Energy.This solution technique advantage has：First, using double barricade waterproof constructions, more glue can be accommodated, glue is full of in gap, will
It is fully sealed on the outside of vibrating diaphragm, effectively improves the water resistance of the Microspeaker；Secondly, can be expanded after glue curing, volume increases
Greatly, certain pressure is generated to vibrating diaphragm, further improves its water resistance；Finally, water-proof elastic sealing ring is easy for installation, is pressurized
Reaction force is generated after contracting, waterproof sealing effect is more excellent, realizes the double protection functions of waterproof.
The connection set forth above that first shell 1 and second shell 2 can be realized by way of buckle, below with another real
Existing mode is described in detail.As shown in figure 4, protrusion at the periphery of the end face being connected with the vibrating diaphragm 4 of the first shell 1
It is provided with multiple hot molten columns 15；It covers and is closed when in the first shell 1 when the second shell 2, by heating the hot molten column
15, be connected the first shell 1 and the second shell 2.In encapsulation, second shell 2 can be covered to conjunction in the first shell 1
On, it being allowed to melt by heating the hot molten column, the liquid materials after thawing are adhered in second shell 2 and first shell 1,
The connection of first shell 1 and second shell 2 can be realized after curing.
In order to avoid the upper surface that resolidification obtains after thawing hotmelt substance protrusion is arranged at the second shell 2 influences
Beauty can be equipped with step-like notch 21 corresponding with the hot molten column 15 at the edge of the second shell.It is described step-like scarce
The hotmelt substances that mouth 21 obtains for resolidification after accommodating melt.
In the specific implementation, as shown in figure 4, the center position of the second shell 2 is provided with out acoustic aperture 300；It is described
The central part 42 of vibrating diaphragm 4 be aligned it is described go out acoustic aperture 300 set.The sound that the vibrating diaphragm 4 vibration generates by it is described go out acoustic aperture 300
Outflow.
In a kind of achievable scheme, as shown in figure 4, the vibrating diaphragm 4 further includes ring portion 43；The ring portion 43 encloses
It is set around the central part 42；The fixed part 41 is set around the ring portion 43.
Further, the electroacoustic transducer further includes magnetic circuit system.As shown in Figure 3 and Figure 4, the vibrational system is also wrapped
It includes：It is sticked and the voice coil 31 on side of the vibrating diaphragm 4 close to the magnetic circuit system and is sticked at the center of the vibrating diaphragm 4
The reinforcement part 32 in portion 42.
The magnetic circuit system includes：Conductive magnetic yoke 12；The conductive magnetic yoke 12 includes being fixed on the flat of 1 bottom of first shell
Plate portion 120 and the lug boss 121 being arranged on around the flat part 120, wherein, the lug boss 121 is towards away from described the
The direction extension of one housing, 1 bottom；The magnetic circuit system further includes：It is fixed on ferromagnetic the 13 of the flat part 120 and is sticked
Washer 14 in described ferromagnetic 13 one side away from the flat part 120；Described ferromagnetic 13 and the washer 14 with it is described convex
Play between portion 121 that there are magnetic gap, the voice coil 31 to be hung in the magnetic gap.
In another embodiment, the electroacoustic transducer, including：Vibrational system, elastic seal ring 3 and solid for accommodating
The shell of the fixed vibrational system；The shell includes first shell 1 and the second shell being connected in the first shell 1
2；The vibrational system includes vibrating diaphragm 4, and the vibrating diaphragm 4 includes being fixed between the first shell 1 and the second shell 2
Fixed part 41；The end face being connected with the vibrating diaphragm 4 of the second shell 2 is equipped with round groove 11；The elastic seal ring 3
It is partly contained in the round groove 11；When the fixed part 41 is fixed in the second shell 2, the fixed part 41
The elastic seal ring 3 is squeezed so that the elastic seal ring 3 is in compressive state.
Further, the outer side surface of the first shell 1 is formed beyond the outer side surface of the second shell 2 outside first
Reveal end face；Extend the first barricade 201 from first exposed junction towards 2 direction of second shell；First barricade 201
There are the first gaps 100 between the outer side surface of the second shell 2；Fluid sealant is filled in first gap 100.
In the present embodiment, shortcoming can be found in the corresponding contents in the various embodiments described above, and details are not described herein again.
Although some specific embodiments of the utility model are described in detail by example, this field
It is to be understood by the skilled artisans that above example merely to illustrating rather than in order to limit the scope of the utility model.This
Field it is to be understood by the skilled artisans that can not depart from the scope of the utility model and spirit in the case of, to above example
It modifies.The scope of the utility model is defined by the following claims.
Claims (10)
1. a kind of electroacoustic transducer, which is characterized in that including：Vibrational system, elastic seal ring and for accommodate it is fixed described in
The shell of vibrational system；
The shell includes first shell and the second shell being connected in the first shell；
The vibrational system includes vibrating diaphragm, and the vibrating diaphragm includes being fixed on consolidating between the first shell and the second shell
Determine portion；
The end face being connected with the vibrating diaphragm of the first shell is equipped with round groove；
The elastic seal ring is partly contained in the round groove；
When the fixed part is fixed in the first shell, the fixed part squeezes the elastic seal ring so that the elasticity
Sealing ring is in compressive state.
2. electroacoustic transducer according to claim 1, which is characterized in that
The outer side surface of the second shell is concordant with the outer side surface of the first shell.
3. electroacoustic transducer according to claim 1, which is characterized in that the outer side surface of the first shell is beyond described
The outer side surface of second shell forms the first exposed end face；
Extend the first barricade from first exposed junction towards the second shell direction；
There are the first gaps between first barricade and the outer side surface of the second shell；
Fluid sealant is filled in first gap.
4. electroacoustic transducer according to claim 3, which is characterized in that the direction second shell of first barricade
Side be slope so that the first barricade upper end is narrower than lower end.
5. the electroacoustic transducer according to claim 3 or 4, which is characterized in that the first shell connects with the vibrating diaphragm
The second barricade is additionally provided on the end face connect, the height of second barricade is less than first barricade；
The upper surface of the elastic seal ring is higher by the upper surface of second barricade；
Second barricade lifts the vibrating diaphragm, in the outside of the elastic seal ring first shell with the vibrating diaphragm
The second gap is formed between the end face of connection and the fixed part of the vibrating diaphragm；
Second gap and first gap area.
6. electroacoustic transducer according to claim 5, which is characterized in that the elastic seal ring is arranged on the second gear
On wall or against second barricade direction first barricade sidewall edge set.
7. according to the electroacoustic transducer any one of claim 1-4, which is characterized in that the first shell with it is described
Protrusion is provided with multiple hot molten columns at the periphery of the end face of vibrating diaphragm connection；
When the second shell lid close when in the first shell, by heat the hot molten column be connected the first shell and
The second shell.
8. electroacoustic transducer according to claim 7, which is characterized in that the edge of the second shell is equipped with and the heat
The corresponding step-like notch of molten column.
9. a kind of electroacoustic transducer, which is characterized in that including：Vibrational system, elastic seal ring and for accommodate it is fixed described in
The shell of vibrational system；
The shell includes first shell and the second shell being connected in the first shell；
The vibrational system includes vibrating diaphragm, and the vibrating diaphragm includes being fixed on consolidating between the first shell and the second shell
Determine portion；
The end face being connected with the vibrating diaphragm of the second shell is equipped with round groove；
The elastic seal ring is partly contained in the round groove；
When the fixed part is fixed in the second shell, the fixed part squeezes the elastic seal ring so that the elasticity
Sealing ring is in compressive state.
10. electroacoustic transducer according to claim 9, which is characterized in that the outer side surface of the first shell exceeds institute
The outer side surface for stating second shell forms the first exposed end face；
Extend the first barricade from first exposed junction towards the second shell direction；
There are the first gaps between first barricade and the outer side surface of the second shell；
Fluid sealant is filled in first gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721431784.9U CN207427452U (en) | 2017-10-31 | 2017-10-31 | Electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721431784.9U CN207427452U (en) | 2017-10-31 | 2017-10-31 | Electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207427452U true CN207427452U (en) | 2018-05-29 |
Family
ID=62309483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721431784.9U Expired - Fee Related CN207427452U (en) | 2017-10-31 | 2017-10-31 | Electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207427452U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110248295A (en) * | 2019-06-27 | 2019-09-17 | 歌尔股份有限公司 | Sounding device and electronic equipment |
| CN110830888A (en) * | 2019-11-12 | 2020-02-21 | 歌尔股份有限公司 | Vibrating diaphragm and sounder monomer comprising same |
| CN110933563A (en) * | 2019-11-22 | 2020-03-27 | 歌尔股份有限公司 | Sound generating device module and electronic product |
| CN111787468A (en) * | 2020-07-09 | 2020-10-16 | 瑞声科技(新加坡)有限公司 | Loudspeaker |
| WO2022006807A1 (en) * | 2020-07-09 | 2022-01-13 | 瑞声声学科技(深圳)有限公司 | Loudspeaker |
-
2017
- 2017-10-31 CN CN201721431784.9U patent/CN207427452U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110248295A (en) * | 2019-06-27 | 2019-09-17 | 歌尔股份有限公司 | Sounding device and electronic equipment |
| CN110248295B (en) * | 2019-06-27 | 2021-02-19 | 歌尔股份有限公司 | Sound production device and electronic equipment |
| CN110830888A (en) * | 2019-11-12 | 2020-02-21 | 歌尔股份有限公司 | Vibrating diaphragm and sounder monomer comprising same |
| CN110933563A (en) * | 2019-11-22 | 2020-03-27 | 歌尔股份有限公司 | Sound generating device module and electronic product |
| CN110933563B (en) * | 2019-11-22 | 2021-02-19 | 歌尔股份有限公司 | Sound generating device module and electronic product |
| CN111787468A (en) * | 2020-07-09 | 2020-10-16 | 瑞声科技(新加坡)有限公司 | Loudspeaker |
| WO2022006807A1 (en) * | 2020-07-09 | 2022-01-13 | 瑞声声学科技(深圳)有限公司 | Loudspeaker |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180529 Termination date: 20201031 |