CN203909720U - Dustproof keyboard - Google Patents
Dustproof keyboard Download PDFInfo
- Publication number
- CN203909720U CN203909720U CN201420323987.6U CN201420323987U CN203909720U CN 203909720 U CN203909720 U CN 203909720U CN 201420323987 U CN201420323987 U CN 201420323987U CN 203909720 U CN203909720 U CN 203909720U
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- Prior art keywords
- keyboard
- air pump
- air
- key
- hole
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Abstract
The utility model discloses a dustproof keyboard which comprises an upper cover and a base which are fixedly connected. The upper cover is provided with a plurality of key holes for installing keys and silica gel caps. An air pump installation groove is formed in one side of the upper cover. An air pump for making air pressure inside the keyboard larger than the external air pressure is fixedly arranged in the air pump installation groove. The position, corresponding to an air suction opening of the air pump, of the base is provided with an air suction hole communicated with the outside world. The position, corresponding to an exhaust opening of the air pump, of the air pump installation groove is provided with an exhaust hole communicated with the interior of the keyboard. The side, close to the base, of each key hole is provided with an air passing hole. Air exhausted out of the air pump passes through the interior of the keyboard, then enters the key holes from the air passing holes, and is exhausted out of the keyboard from one side of each key. According to the dustproof keyboard, the air pump is arranged inside the keyboard so that air pressure inside the keyboard can be larger than the external air pressure, air is exhausted from movement gaps of the keys, and therefore dust is prevented from entering the keyboard.
Description
Technical field
The utility model relates to the technical field of keyboard dust-proof, relates in particular to a kind of dustproof keyboard.
Background technology
Keyboard is one of important input equipment of computing machine, and is widely used in various other opertaing devices.Current keyboard major part is used plastics as shell, and circuit board and components and parts are set in inside, and the button of keyboard is movement parts, cannot seal completely, and dust can enter keyboard and affect the performance reliability of keyboard by the movement clearance of button.For example dust is adsorbed in the movement clearance that causes circuit loose contact and dust to be adsorbed on button on circuit board and makes button dyskinesia even stuck, has a strong impact on the serviceable life of keyboard.Keyboard is used under various environment, such as office, common workshop, working-yard and family etc., the environment for use of office and family is relative better, but more or less all can have dust, and the environment for use of common workshop and working-yard is more severe, dust is a lot.Therefore, no matter keyboard is used under which kind of working environment, we are all necessary keyboard effectively to prevent dust, and guarantee the reliability of keyboard feature and the serviceable life of prolonging keyboard.
Utility model content
The purpose of this utility model is: a kind of dustproof keyboard is provided, by air pump being set in keyboard and making the air pressure of keyboard be greater than external air pressure, to reach, prevents that dust from entering the object of keyboard.
For reaching this object, the utility model by the following technical solutions:
A kind of dustproof keyboard, comprise the upper cover and the base that are fixedly connected with, described upper cover offers some for the key hole of button and silicon rubber cup is installed, described button is arranged on described key hole away from a side of described base, described silicon rubber cup is arranged on described key hole near a side of described base, between described upper cover and described base, be provided with flexible PCB, one side of described upper cover offers air pump mounting groove, in described air pump mounting groove, be fixedly installed and be useful on the air pump that makes the air pressure of keyboard be greater than external air pressure, the air entry position of the corresponding described air pump of described base offers the suction hole being in communication with the outside, the exhausr port position of the corresponding described air pump of described air pump mounting groove offers the vent port being communicated with keyboard, described key hole offers air passing hole near a side of described base, the gas that described air pump is discharged enters described key hole and discharges keyboard outside from described button one side from described air passing hole after keyboard.
Particularly, described key hole is through hole, described key hole is square opening near one end of described button, described key hole is conical bore near one end of described silicon rubber cup, described button is arranged in the square opening of described key hole and can in described key hole, slides, described silicon rubber cup integral body is coniform, described silicon rubber cup be arranged in the conical bore of described key hole and with described button butt.When button is subject to External Force Acting, described silicon rubber cup can be followed described by key motion deformation, and when the suffered external force of button disappears, described silicon rubber cup automatically resets and promotes described button and gets back to initial position.
Particularly, described upper cover is stretched formation extension near an epitaxial lateral overgrowth of space bar, and the inner side of described extension is also positioned at centre position and offers described air pump mounting groove.
Preferably, the through hole that described suction hole is at least one strip or several manholes, described suction hole is over against described air pump mounting groove.
Preferably, the exhausr port of described air pump and described vent port butt, the gas that described air pump is discharged directly enters keyboard by described vent port.
After keyboard energising, described air pump starts and works, outside air is arrived described air entry and is entered described air pump by described suction hole, gas is discharged and enters keyboard by described vent port from described exhausr port after described air pump supercharging, then the gas of higher pressure enters in described key hole and by the movement clearance of described button, arrives a side of described button from described air passing hole, finally discharges keyboard outside.By the movement clearance place at described button, form one-way gas flow from inside to outside, avoid dust to enter keyboard from the movement clearance of described button, effectively realize the object of keyboard dust-proof.
As a kind of preferred technical scheme, described key hole extends and forms flange near base described in a side direction of described base, described flange is circular, described air passing hole is arranged on the root of described flange, one side butt of described flange and described flexible PCB, the inside surface butt of the opposite side of described flexible PCB and described base, described flange arranges the inside surface of described upper cover and described flexible circuit sheet separation, and the gap between the inside surface of described upper cover and described flexible PCB forms the air duct of keyboard.The gas of discharging from described vent port first passes through described air duct, then enters described key hole from described air passing hole.
Particularly, the root of described flange refers to the position that described flange contacts with the inside surface of described upper cover.
Preferably, offer four described air passing holes on described flange, four described air passing holes are evenly distributed on the whole circumference of described flange.
As a kind of preferred technical scheme, corresponding described suction hole position is provided with the filtration unit for purifying air, and described filtration unit is detachably arranged between described suction hole and the air entry of described air pump.
Preferably, described filtration unit is screen pack, and described screen pack detachably arranges, and cleans or change very convenient.
Preferably, described filtration unit is electrostatic precipitator.
As a kind of preferred technical scheme, the corresponding described air pump of described base is provided with dismountable air pump cover, offers described suction hole on described air pump cover.
Preferably, described air pump cover integral body is rectangle, on a wherein long limit of described air pump cover, be provided with two and insert piece, another of described air pump cover is provided with a clamping block on long limit, on described base, corresponding described insertion piece and described clamping block offer three spacing holes, particularly, after described air pump and described filtration unit are fixing, first two described insertion pieces are inserted in the spacing hole of described base, then described clamping block is pressed to the spacing hole that enters opposite side and completed the fixing of described air pump cover.
As a kind of preferred technical scheme, the sidewall of described air pump mounting groove to described base extend and with described base butt, described vent port is opened on the sidewall of described air pump mounting groove.
Particularly, the opening size of described air pump mounting groove is greater than the size of described air pump cover, and therefore the sidewall of described air pump mounting groove and the butt position of described base are positioned at the periphery of described air pump cover.
As a kind of preferred technical scheme, described filtration unit is arranged in described air pump mounting groove, and described filtration unit covers the opening of described air pump mounting groove completely, makes outside air after described filtration unit, just can enter keyboard.
As a kind of preferred technical scheme, described filtration unit is arranged on described air pump cover, and described filtration unit covers whole described suction hole completely, makes outside air after described filtration unit, just can enter keyboard.
As a kind of preferred technical scheme, described button comprises key cover and key post, described key post integral body is rectangular column, described key post is wherein provided with buckle on two relative sides perpendicular to described key cover, the both sides of described buckle offer slot to make way, and the air that enters described key hole is arrived a side of described key cover and discharged keyboard outside by described slot to make way.
Preferably, the corresponding described buckle of described key hole is provided with limited step, guarantees that keyboard is in normal use procedure, and described button can not deviate from described key hole.
As a kind of preferred technical scheme, described key post forms four right angles perpendicular to the connecting portion of four sides of described key cover, described in each, two right-angle sides at right angle extend to form respectively guiding fin laterally, on described key post, be provided with altogether eight described guiding fins, the inwall butt of described guiding fin and described key hole, the air that enters described key hole is arrived a side of described key cover and is discharged keyboard outside by the gap between described key post and the inwall of described key hole.
As a kind of preferred technical scheme, on described button, be provided with a dustproof membrane, the whole described button of described dustproof membrane overlay keyboard.
Preferably, described dustproof membrane is pellosil.
The beneficial effects of the utility model are: a kind of dustproof keyboard is provided, by air pump is set in keyboard, makes the air pressure of keyboard be greater than external air pressure, and gas is discharged from the movement clearance of button, to reach, prevent that dust from entering the object of keyboard.
Accompanying drawing explanation
According to drawings and embodiments the utility model is described in further detail below.
Fig. 1 is the front view of the dustproof keyboard described in embodiment;
Fig. 2 is the left view of the dustproof keyboard described in embodiment;
Fig. 3 is the right view of the dustproof keyboard described in embodiment;
Fig. 4 is the cut-open view of A-A direction shown in Fig. 2;
Fig. 5 is the partial enlarged drawing of B position shown in Fig. 3;
Fig. 6 is the partial enlarged drawing of C position shown in Fig. 4;
Fig. 7 is the partial enlarged drawing of D position shown in Fig. 4.
In Fig. 1 to Fig. 7:
1, upper cover; 11, the first inside surface; 12, key hole; 13, flange; 14, air passing hole; 15, extension; 16, air pump mounting groove; 17, sidewall; 18, vent port;
2, base; 21, the second inside surface; 22, air pump cover; 23, suction hole;
3, button; 31, key cover; 32, key post; 321, buckle; 322, slot to make way; 323, guiding fin;
4, silicon rubber cup; 5, flexible PCB; 6, air duct; 7, dustproof membrane; 8, air pump; 9, filtration unit.
Embodiment
Below in conjunction with accompanying drawing and by embodiment, further illustrate the technical solution of the utility model.
As shown in Fig. 1～7, in the present embodiment, a kind of dustproof keyboard, comprise the upper cover 1 and the base 2 that are fixedly connected with, upper cover 1 offers some for the key hole 12 of button 3 and silicon rubber cup 4 is installed, button 3 is arranged on key hole 12 away from a side of base 2, silicon rubber cup 4 is arranged on key hole 12 near a side of base 2, key hole 12 is through hole, key hole 12 is square opening near one end of button 3, key hole 12 is conical bore near one end of silicon rubber cup 4, button 3 is arranged on can be in the interior slip of key hole 12 in the square opening of key hole 12, silicon rubber cup 4 integral body are coniform, silicon rubber cup 4 be arranged in the conical bore of key hole 12 and with button 3 butts.When button 3 is subject to External Force Acting and moves downward, can push silicon rubber cup 4, can under the effect of button 3, there is elastic deformation in silicon rubber cup 4, and when the suffered external force of button 3 disappears, silicon rubber cup 4 automatically resets and promotes button 3 and gets back to initial position.
Between upper cover 1 and base 2, be provided with flexible PCB 5, the inside surface of upper cover 1 is the first inside surface 11, the inside surface of base 2 is the second inside surface 21, key hole 12 extends and forms flange 13 near a side direction base 2 of base 2, flange 13 is circular, air passing hole 14 is arranged on the root of flange 13, can offer at least one air passing hole 14 on flange 13.In the present embodiment, the quantity of air passing hole 14 is four, and air passing hole 14 is evenly distributed on the circumference of flange 13.One side butt of flange 13 and flexible PCB 5, the second inside surface 21 butts of the opposite side of flexible PCB 5 and base 2, flange 13 arranges the first inside surface 11 of upper cover 1 and flexible PCB 5 gaps, and the first inside surface 11 of upper cover 1 and the gap between flexible PCB 5 form the air duct 6 of keyboard.
Button 3 comprises key cover 31 and key post 32, key post 32 integral body are rectangular column, key post 32 is wherein provided with buckle 321 on two relative sides perpendicular to key cover 31, and the corresponding buckle 321 of key hole 12 is provided with limited step, and the both sides of buckle 321 offer slot to make way 322.Key post 32 forms four right angles perpendicular to the connecting portion of four sides of key cover 31, described in each, two right-angle sides at right angle extend to form respectively guiding fin 323 laterally, on key post 32, be provided with altogether eight guiding fins 323, the inwall butt of guiding fin 323 and key hole 12, the air that enters key hole 12 is arrived a side of key covers 31 and is discharged keyboard outside by the gap between key post 32 and the inwall of key hole 12 and slot to make way 322.
On button 3, be provided with a dustproof membrane 7, whole buttons 3 of dustproof membrane 7 overlay keyboards.In the present embodiment, dustproof membrane 7 is pellosil.
Upper cover 1 is stretched and is formed extension 15 near an epitaxial lateral overgrowth of space bar, the inner side of extension 15 is also positioned at centre position and offers air pump mounting groove 16, in air pump mounting groove 16, be fixedly installed and be useful on the air pump 8 that makes the air pressure of keyboard be greater than external air pressure, the corresponding air pump 8 of base 2 is provided with dismountable air pump cover 22, and on air pump cover 22, the air entry of corresponding air pump 8 offers suction hole 23.In the present embodiment, suction hole 23 is the through hole of a strip, and in other embodiment, suction hole 23 can be also several manholes.Particularly, air pump cover 22 integral body are rectangle, be provided with two and insert piece on a wherein long limit of air pump cover 22, on another long limit of air pump cover 22, are provided with a clamping block, and on base 2, corresponding described insertion piece and described clamping block offer three spacing holes.After air pump 8 is fixing, first by the spacing hole of two described insertion piece inserted bases 2, then described clamping block is pressed to the spacing hole that enters opposite side and completed the fixing of air pump cover 22.
The sidewall 17 of air pump mounting groove 16 to base 2 extend and with base 2 butts, the position that vent port 18 is opened in the exhausr port of corresponding air pump 8 on the sidewall 17 of air pump mounting groove 16 offers the vent port 18 being communicated with keyboard, the exhausr port of air pump 8 and vent port 18 butts, the gas that air pump 8 is discharged directly enters keyboard by vent port 18.The opening size of air pump mounting groove 16 is greater than the size of air pump cover 22, and the sidewall 17 of air pump mounting groove 16 and the butt position of base 2 are positioned at the periphery of air pump cover 22.
In the present embodiment, filtration unit 9 is arranged on a side of close air pump 8 on air pump cover 22 and between suction hole 23 and the air entry of air pump 8, filtration unit 9 is detachably installed, filtration unit 9 is screen pack, described screen pack covers whole suction hole 23 completely, guarantees that outside air just can enter keyboard after filtration unit 9.
In other embodiment, the interior side near air pump cover 22 of air pump mounting groove 16 is also detachably provided with filtration unit 9 between suction hole 23 and the air entry of air pump 8, filtration unit 9 is electrostatic precipitator, described electrostatic precipitator covers the opening of air pump mounting groove 16 completely, guarantees that outside air just can enter keyboard after filtration unit 9.
Particularly, after keyboard energising, air pump 8 starts and works, outside air arrives described air entry and enters air pump 8 by suction hole 23 and after filtration unit 9 filters, gas is discharged and enters keyboard by vent port 18 from described exhausr port after air pump 8 superchargings, then the gas of higher pressure enters in key hole 12 by air duct 6 and from air passing hole 14, and finally the movement clearance by button 3 arrives a side of button 3 and discharges keyboard outside.By the movement clearance place at button 3, form one-way gas flow from inside to outside, avoid dust to enter keyboard from the movement clearance of button 3, effectively realize the object of keyboard dust-proof.
" first " herein, " second " are only used to be distinguished on describing, and do not have special implication.
What need statement is; above-mentioned embodiment is only preferred embodiment of the present utility model and institute's application technology principle; in technical scope disclosed in the utility model; the variation that any those skilled in the art of being familiar with easily expect or replacement, all should be encompassed in protection domain of the present utility model.
Claims (10)
1. a dustproof keyboard, comprise the upper cover and the base that are fixedly connected with, described upper cover offers some for the key hole of button and silicon rubber cup is installed, described button is arranged on described key hole away from a side of described base, described silicon rubber cup is arranged on described key hole near a side of described base, between described upper cover and described base, be provided with flexible PCB, it is characterized in that, one side of described upper cover offers air pump mounting groove, in described air pump mounting groove, be fixedly installed and be useful on the air pump that makes the air pressure of keyboard be greater than external air pressure, the air entry position of the corresponding described air pump of described base offers the suction hole being in communication with the outside, the exhausr port position of the corresponding described air pump of described air pump mounting groove offers the vent port being communicated with keyboard, described key hole offers air passing hole near a side of described base, the gas that described air pump is discharged enters described key hole and discharges keyboard outside from described button one side from described air passing hole after keyboard.
2. dustproof keyboard according to claim 1, it is characterized in that, described key hole has flange near a side of described base, described air passing hole is arranged on the root of described flange, described flange and described flexible PCB butt, the gap between the inside surface of described upper cover and described flexible PCB forms the air duct of keyboard.
3. dustproof keyboard according to claim 2, is characterized in that, corresponding described suction hole position is provided with the filtration unit for purifying air, and described filtration unit is detachably arranged between described suction hole and the air entry of described air pump.
4. dustproof keyboard according to claim 3, is characterized in that, the corresponding described air pump of described base is provided with dismountable air pump cover, offers described suction hole on described air pump cover.
5. dustproof keyboard according to claim 4, is characterized in that, the sidewall of described air pump mounting groove to described base extend and with described base butt, described vent port is opened on the sidewall of described air pump mounting groove.
6. dustproof keyboard according to claim 5, it is characterized in that, described filtration unit is arranged in described air pump mounting groove, and described filtration unit covers the opening of described air pump mounting groove completely, makes outside air after described filtration unit, just can enter keyboard.
7. dustproof keyboard according to claim 5, is characterized in that, described filtration unit is arranged on described air pump cover, and described filtration unit covers whole described suction hole completely, makes outside air after described filtration unit, just can enter keyboard.
8. according to the dustproof keyboard described in claim 6 or 7 any one, it is characterized in that, described button comprises key cover and key post, described key post integral body is rectangular column, described key post is wherein provided with buckle on two relative sides perpendicular to described key cover, the both sides of described buckle offer slot to make way, and the air that enters described key hole is arrived a side of described key cover and discharged keyboard outside by described slot to make way.
9. dustproof keyboard according to claim 8, it is characterized in that, described key post forms four right angles perpendicular to the connecting portion of four sides of described key cover, described in each, two right-angle sides at right angle extend to form respectively guiding fin laterally, the inwall butt of described guiding fin and described key hole, the air that enters described key hole is arrived a side of described key cover and is discharged keyboard outside by the gap between described key post and the inwall of described key hole.
10. dustproof keyboard according to claim 9, is characterized in that, is provided with a dustproof membrane on described button, the whole described button of described dustproof membrane overlay keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420323987.6U CN203909720U (en) | 2014-06-17 | 2014-06-17 | Dustproof keyboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420323987.6U CN203909720U (en) | 2014-06-17 | 2014-06-17 | Dustproof keyboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203909720U true CN203909720U (en) | 2014-10-29 |
Family
ID=51783974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420323987.6U Expired - Fee Related CN203909720U (en) | 2014-06-17 | 2014-06-17 | Dustproof keyboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203909720U (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808804A (en) * | 2015-05-18 | 2015-07-29 | 苏州云远网络技术有限公司 | Electromagnetic induction electrostatic dust collection keyboard |
| CN106933378A (en) * | 2017-04-24 | 2017-07-07 | 习水县西科电脑科技有限公司 | Self-cleaning keyboard |
| CN106971886A (en) * | 2017-06-08 | 2017-07-21 | 东莞质研工业设计服务有限公司 | A kind of dedusting button |
| CN107214146A (en) * | 2017-06-08 | 2017-09-29 | 东莞质研工业设计服务有限公司 | A kind of keyboard |
| CN107688396A (en) * | 2017-10-17 | 2018-02-13 | 安徽天鹅科技实业（集团）有限公司 | A kind of inflatable cleans keyboard |
| CN108074768A (en) * | 2017-06-08 | 2018-05-25 | 东莞质研工业设计服务有限公司 | Dedusting button equipped with sealing ring |
| CN108227942A (en) * | 2017-12-29 | 2018-06-29 | 重庆欣璇网络科技有限公司 | A kind of keyboard convenient for heat dissipation |
| CN108279786A (en) * | 2018-02-09 | 2018-07-13 | 佛山市和富创电子科技有限公司 | A kind of computer dedusting keyboard |
| CN109953882A (en) * | 2019-04-18 | 2019-07-02 | 贝乐（广州）智能信息科技有限公司 | Ocular region massaging device |
| CN110989778A (en) * | 2019-12-13 | 2020-04-10 | 义乌辛璟电子商务有限公司 | Notebook computer key convenient to remove dust and radiate based on photoresistor principle |
| CN112603366A (en) * | 2020-12-18 | 2021-04-06 | 曼陀罗(乳源)医药制造有限公司 | Portable color ultrasound instrument with keyboard pollution discharge function |
| CN112932071A (en) * | 2021-03-11 | 2021-06-11 | 湖南文理学院 | Screen support frame of keyboard, mouse, screen that can accomodate fast |
-
2014
- 2014-06-17 CN CN201420323987.6U patent/CN203909720U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808804B (en) * | 2015-05-18 | 2017-11-28 | 沈荣存 | A kind of electromagnetic induction electrostatic precipitation keyboard |
| CN104808804A (en) * | 2015-05-18 | 2015-07-29 | 苏州云远网络技术有限公司 | Electromagnetic induction electrostatic dust collection keyboard |
| CN106933378A (en) * | 2017-04-24 | 2017-07-07 | 习水县西科电脑科技有限公司 | Self-cleaning keyboard |
| CN108074768B (en) * | 2017-06-08 | 2019-10-18 | 东莞质研工业设计服务有限公司 | Dedusting key equipped with sealing ring |
| CN106971886A (en) * | 2017-06-08 | 2017-07-21 | 东莞质研工业设计服务有限公司 | A kind of dedusting button |
| CN107214146A (en) * | 2017-06-08 | 2017-09-29 | 东莞质研工业设计服务有限公司 | A kind of keyboard |
| CN108074768A (en) * | 2017-06-08 | 2018-05-25 | 东莞质研工业设计服务有限公司 | Dedusting button equipped with sealing ring |
| CN107688396A (en) * | 2017-10-17 | 2018-02-13 | 安徽天鹅科技实业（集团）有限公司 | A kind of inflatable cleans keyboard |
| CN108227942A (en) * | 2017-12-29 | 2018-06-29 | 重庆欣璇网络科技有限公司 | A kind of keyboard convenient for heat dissipation |
| CN108227942B (en) * | 2017-12-29 | 2019-11-08 | 重庆欣璇网络科技有限公司 | A kind of keyboard convenient for heat dissipation |
| CN108279786A (en) * | 2018-02-09 | 2018-07-13 | 佛山市和富创电子科技有限公司 | A kind of computer dedusting keyboard |
| CN109953882A (en) * | 2019-04-18 | 2019-07-02 | 贝乐（广州）智能信息科技有限公司 | Ocular region massaging device |
| CN110989778A (en) * | 2019-12-13 | 2020-04-10 | 义乌辛璟电子商务有限公司 | Notebook computer key convenient to remove dust and radiate based on photoresistor principle |
| CN110989778B (en) * | 2019-12-13 | 2021-04-02 | 韩春燕 | Notebook computer key convenient to remove dust and radiate based on photoresistor principle |
| CN112603366A (en) * | 2020-12-18 | 2021-04-06 | 曼陀罗(乳源)医药制造有限公司 | Portable color ultrasound instrument with keyboard pollution discharge function |
| CN112932071A (en) * | 2021-03-11 | 2021-06-11 | 湖南文理学院 | Screen support frame of keyboard, mouse, screen that can accomodate fast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20200617 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |