CN202886642U - Optical fiber connector - Google Patents
Optical fiber connector Download PDFInfo
- Publication number
- CN202886642U CN202886642U CN 201220395189 CN201220395189U CN202886642U CN 202886642 U CN202886642 U CN 202886642U CN 201220395189 CN201220395189 CN 201220395189 CN 201220395189 U CN201220395189 U CN 201220395189U CN 202886642 U CN202886642 U CN 202886642U
- Authority
- CN
- China
- Prior art keywords
- protective sleeve
- contact pin
- assembly
- joints
- optical fibre
- 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
Images
Landscapes
- Mechanical Coupling Of Light Guides (AREA)
Abstract
An optical fiber connector comprises a pin assembly and a protective sleeve assembly for fixing an optical cable, wherein the pin assembly and the protective sleeve assembly are connected with each other by a flexible protective sleeve. The pin assembly comprises a pin and a pin seat fixed in a pin seat frame and is sleeved in a protective sleeve of the pin seat frame. The protective sleeve comprises a screw-thread protective sleeve and a screw cap, wherein the screw-thread protective sleeve is provided with a clamping block. A connection piece is mounted between the screw-thread protective sleeve and the screw cap in order to prevent screw cap loss when in construction. By adopting cooperation of the screw cap and the clamping block, the optical fiber connector provided by the utility model can clamp a cable more tightly. The optical fiber connector also comprises a returning mechanism for automatically saving a returning distance in an assembling state of the flexible protective sleeve and the cable protective-sleeve assembly, wherein the returning mechanism saves a rebound space for pin motion and avoids bending and tying conditions of the cable because of pin assembly rebound.
Description
Technical field
The utility model relates to a kind of heat molten type joints of optical fibre, particularly a kind of joints of optical fibre with protecting sleeve for thread.
Background technology
Along with the continuous progress of the communication technology, more and more higher to speed and the quality requirements of communication, optical communication and the advantage of himself are used more and more extensive, and optical fiber also obtains considerable use thus, says further it is the optical communication epoch now.The joints of optical fibre, optical fiber with optical fiber between carry out the device that detachable (activity) is connected, it gets up the accurate docking of two end faces of optical fiber, so that being coupled to receive in the optical fiber to greatest extent, the luminous energy that launching fiber sends goes, and make because it is got involved optical link and the impact that system causes is reduced to minimum, the joints of optical fibre have affected reliability and the properties of optical transmission system.
The heat molten type joints of optical fibre refer to, use hot melt to pick, and will need optical fiber and prefabricated connector fused fiber splice and the joints of optical fibre that assemble of termination, and it has the following advantages: 1. junction loss can be ignored; 2. good stability; 3. can adapt to various environment; 4. the words of being furnished with professional heat sealing machine are simple to operate, therefore are widely used.
Also there is following defective in it but simultaneously:
1.Easily occur the situation of cable bending, knotting when the existing joints of optical fibre are connected with terminal, affect transmission quality.
2. have the joints of optical fibre that adopt turn-knob mode fixed cable now, its turn-knob cap is easily lost.
The utility model content
In order to address the above problem; the utility model provides a kind of joints of optical fibre; comprise ceramic contact pin assembly, contact pin skeleton protective sleeve, movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state
Described backing mechanism comprise be arranged on movable protective sleeve, cable protection grip assembly on one of them a stopper slot and be arranged at least two positioners of corresponding junction on another device; described those positioners can snap in respectively stopper slot; distance between two positioners is the rollback distance, or
Described backing mechanism comprise be arranged on movable protective sleeve, cable protection grip assembly one of them at least two stopper slots and be arranged on a positioner of corresponding junction on another device; but the positioner timesharing snaps in respectively different stopper slots; and the distance of described positioner between the stuck point of different stopper slots is the rollback distance
And the rollback distance range is 0.3-1.2mm.
A kind of joints of optical fibre; comprise the ceramic contact pin assembly; contact pin skeleton protective sleeve; movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state; described backing mechanism comprises and is arranged on movable protective sleeve; the cable protection grip assembly on one of them a stopper slot and be arranged at least two positioners of corresponding junction on another device; described those positioners can snap in respectively stopper slot, and the distance between two positioners is the rollback distance.
Two positioners comprise the first limited block and the second limited block, one end face of described the first limited block is the inclined-plane, the height of the second limited block is less than the height of the first limited block, wherein a kind of in surperficial curved, the inclined-plane of described the second limited block, but two positioner timesharing are stuck in the stopper slot.
Cooperating of a plurality of stopper slots on stop means that described backing mechanism comprises further that screw thread protection puts and the movable protective sleeve.
Described cable protection grip assembly comprises protecting sleeve for thread and nut, and described screw thread protection puts and is provided with fixture block.
Described fixture block is taper, and the inboard of fixture block is provided with tread plate.
Described nut is the taper nut, and its tapering is identical with the fixture block tapering.
The two ends of described web member are respectively equipped with connecting portion, and this connecting portion is one or both the combination in annulus, the stuck point.
The rollback distance range of described backing mechanism is 0.3-1.2mm.
A kind of joints of optical fibre; comprise the ceramic contact pin assembly; contact pin skeleton protective sleeve; movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state; described backing mechanism comprises and is arranged on movable protective sleeve; the cable protection grip assembly one of them at least two stopper slots and be arranged on a positioner of corresponding junction on another device; but the positioner timesharing snaps in respectively different stopper slots, and the distance of described positioner between the stuck point of different stopper slots is the rollback distance.
The rollback distance range of described backing mechanism is 0.3-1.2mm.
Screw thread protection of the present utility model puts and is provided with the first limited block and the second limited block; arranging of the first limited block and the second limited block produced the resilience space that contact pin moves; original state the second limited block is stuck in the stopper slot; for contact pin has been reserved the resilience space; meeting nature resilience when connector inserts terminal; the second limited block is extruded stopper slot; move behind the protecting sleeve for thread; the first limited block is stuck in the stopper slot; so that the ceramic contact pin of connector end not can with terminal end face downthrust by force, avoided the damage fiber end face.Simultaneously, because the resilience of protecting sleeve for thread and cable integral body, avoided the contact pin component resilience and the situation that makes cable bend, tie a knot.
The utility model also is provided with web member, and an end of web member is connected with protecting sleeve for thread, and the other end is connected with nut, and protecting sleeve for thread and nut are linked together, and makes cap be difficult for losing during construction.
Fixture block of the present utility model is designed to taper, and the inboard of fixture block is provided with tread plate, and the tapering of nut is identical with the tapering of fixture block, and optical fibre clip is in fixture block, and along with tightening of nut, fixture block is more and more tighter with optical fibre clip.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is protecting sleeve for thread schematic diagram of the present utility model;
Fig. 3 is the utility model combination schematic diagram.
Embodiment
Further specify with reference to the accompanying drawings the utility model.
See also Fig. 1 to Fig. 3, the joints of optical fibre with protecting sleeve for thread of the present utility model comprise contact pin component and are used for the fixedly protective sleeve assembly of optical cable that contact pin component is connected movable protective sleeve and connects with the protective sleeve assembly.
Described contact pin component comprises contact pin, Plug pin patch bay and Plug pin patch bay skeleton, described Plug pin patch bay comprises the first Plug pin patch bay 21 and the second Plug pin patch bay 22, described contact pin is ceramic contact pin 1, ceramic contact pin 1 and the first Plug pin patch bay 21 interference fit, the first Plug pin patch bay 21 is set in the second Plug pin patch bay 22, the second Plug pin patch bay 22 is fixed in the Plug pin patch bay skeleton 4, be provided with elastic component 5 between the second Plug pin patch bay 22 and the Plug pin patch bay skeleton 4, the second Plug pin patch bay 22 is fixed in the contact pin skeleton 3 with Plug pin patch bay skeleton 4, jointly forms contact pin component.One end of contact pin component is the threaded portion on the second Plug pin patch bay 22 that Plug pin patch bay skeleton 4 stretches out.During when the welding of finishing optical fiber, with thermoplastic sleeve pipe thermoplastic fusion point, the thermoplastic sleeve edge behind the thermoplastic can be wrapped on 22 the screw thread, makes the thermoplastic sleeve pipe tightr with being connected of contact pin component, difficult drop-off.Be embedded with optical fiber in the first Plug pin patch bay 21, also be provided with locating piece and the second fixture block on the Plug pin patch bay skeleton 4, described contact pin skeleton 3 is provided with locating slot 31 and the first fixture block 32.
Described protective sleeve assembly comprises protecting sleeve for thread 8 and nut 9; protecting sleeve for thread 8 is provided with fixture block 81, the first limited block 83 and the second limited block 84; an end face of the first limited block 83 is set as the slope; the surface of the second limited block 84 is set as arc; the height of the first limited block 83 is higher than the second limited block 84; fixture block 81 is comprised of two fixture blocks at least; the inboard of fixture block 81 is provided with anti-slip veins or tread plate 82; fixture block 81 is shaped as taper; also be provided with screw thread 85 on the protecting sleeve for thread 8; described nut 9 be shaped as taper, its tapering is identical with the tapering of fixture block 81.
Described movable protective sleeve 7 is provided with stopper slot 71 and the second draw-in groove 72.
Plug pin patch bay skeleton protective sleeve 6 is provided with orienting lug 62 and the first draw-in groove 61, and the gathering sill coupling on orienting lug 62 and the terminal is convenient to insert terminal.
Protecting sleeve for thread 8 is connected with nut by web member 91 connections; web member of the present utility model two ends respectively are provided with an annulus; one end is set in the protecting sleeve for thread 8; the other end is set in the nut 9; protecting sleeve for thread 8 is connected connection with nut; nut 9 can not lost during construction; the two ends of this protecting sleeve for thread respectively are provided with a salient point; respectively be provided with a concave point on protecting sleeve for thread 8 and the nut 9; salient point and concave point interference fit; also protecting sleeve for thread 8 can be connected connection with nut; web member 9 can also be a chain, and the chain two ends are threaded with protecting sleeve for thread 8 and nut 9 respectively, and the shape of web member and connected mode have a variety of; the utility model is not done restriction, so long as by web member protecting sleeve for thread 8 is connected all will falling in the protection domain of the present utility model of connecting with nut.
Ceramic contact pin 1 and little Plug pin patch bay 21 are connected by interference fit; its inside is inserted with pre-buried optical fiber; one end of little Plug pin patch bay 21 connects large Plug pin patch bay 22, spring 5, Plug pin patch bay skeleton 4 successively; the outer cover of Plug pin patch bay skeleton 4 is provided with contact pin skeleton 3; locating piece 41 on the Plug pin patch bay skeleton 4 inserts in the locating slot 31 of contact pin skeleton 3, and Plug pin patch bay skeleton 4 and 3 clampings of contact pin skeleton form a whole jointly; be contact pin component, the end that lid 11 can be enclosed within contact pin 1 shields to contact pin.
On the two ends annulus of adapter sleeve 91 is inserted in respectively protecting sleeve for thread 8 and nut is connected both are connected, form the cable protection grip assembly.The limited block of protecting sleeve for thread 8 snaps in the stopper slot 71 of movable protective sleeve 7, and limited block 84 is stuck on the stopper slot 71, and the cable protection grip assembly is connected with movable protective sleeve.During use; the cable protection grip assembly; movable protective sleeve; the thermoplastic sleeve pipe is set on the cable of wanting to continue successively; the crust of the cable of wanting to continue is divested; the cutting optical fibre end face; again the optical fiber of the pre-buried optical fiber that exposes in the ceramic contact pin assembly and the above-mentioned cable of wanting to continue is placed on and carries out hot melt in the heat sealing machine and continue; continue finish after; move horizontally the thermoplastic sleeve pipe that is set on the cable and cover splicing point; and the thermoplastic sleeve portion is put in the heating tank of heat sealing machine and heats plastic packaging; after finishing, the second draw-in groove 72 on the movable protective sleeve 7 and the second fixture block 42 on the Plug pin patch bay skeleton 4 are connected and fixed.Again with the sheathed upper Plug pin patch bay skeleton protective sleeve 6 of contact pin component; the first fixture block 32 on the contact pin skeleton 3 snaps in the first draw-in groove 61 of Plug pin patch bay skeleton protective sleeve 6; contact pin component is contained in the Plug pin patch bay skeleton protective sleeve 6 fully; at last with nut 9 turn-knobs on the screw thread 85 of protecting sleeve for thread 8; along with the turn-knob action; nut 9 more presss from both sides fixture block 81 tighter, fixes cable.
When joints of optical fibre insertion terminal of the present utility model, contact pin and terminal are pegged graft when rollback occurs, and rollback is made every effort to promote makes the second limited block 84 withdraw from from stopper slot 71, until the first limited block 83 is stuck on the stopper slot 71, the rollback motion stops.Because the setting of the first limited block 83 and the second limited block 84; for a retraction space has been made in the motion of contact pin rollback; the contact pin component that makes joints of optical fibre inside and the cable of being fixed by the cable protection grip assembly be whole rollback together, is difficult for occuring that cable is crooked, the situation of knotting.
The utility model also can arrange two stopper slots at movable protective sleeve; screw thread protection puts a limited block is set; during installation limited block is snapped in the inboard stopper slot; contact pin and terminal are pegged graft when rollback occurs; limited block falls back in the stopper slot in the outside from the inner side limiting-position groove; because the setting of two stopper slots, for a retraction space has been made in the motion of contact pin rollback, the stuck point distance of two stopper slots is exactly the rollback distance.
Above-mentioned disclosed only be specific embodiment of the utility model, this embodiment only is that clearer explanation the utility model is used, and is not to restriction of the present utility model, the changes that any person skilled in the art can think of all should drop in the protection domain.
Claims (11)
1. joints of optical fibre; comprise ceramic contact pin assembly, contact pin skeleton protective sleeve, movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; it is characterized in that; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state
Described backing mechanism comprise be arranged on movable protective sleeve, cable protection grip assembly on one of them a stopper slot and be arranged at least two positioners of corresponding junction on another device; described those positioners can snap in respectively stopper slot; distance between two positioners is the rollback distance, or
Described backing mechanism comprise be arranged on movable protective sleeve, cable protection grip assembly one of them at least two stopper slots and be arranged on a positioner of corresponding junction on another device; but the positioner timesharing snaps in respectively different stopper slots; and the distance of described positioner between the stuck point of different stopper slots is the rollback distance
And the rollback distance range is 0.3-1.2mm.
2. joints of optical fibre; comprise the ceramic contact pin assembly; contact pin skeleton protective sleeve; movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; it is characterized in that; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state; described backing mechanism comprises and is arranged on movable protective sleeve; the cable protection grip assembly on one of them a stopper slot and be arranged at least two positioners of corresponding junction on another device; described those positioners can snap in respectively stopper slot, and the distance between two positioners is the rollback distance.
3. the joints of optical fibre as claimed in claim 2, it is characterized in that, two positioners comprise the first limited block and the second limited block, one end face of described the first limited block is the inclined-plane, the height of the second limited block is less than the height of the first limited block, wherein a kind of in surperficial curved, the inclined-plane of described the second limited block, but two positioner timesharing are stuck in the stopper slot.
4. the joints of optical fibre as claimed in claim 2 or claim 3 is characterized in that, the cooperating of a plurality of stopper slots on stop means that described backing mechanism comprises further that screw thread protection puts and the movable protective sleeve.
5. the joints of optical fibre as claimed in claim 2 is characterized in that, described cable protection grip assembly comprises protecting sleeve for thread and nut, and described screw thread protection puts and is provided with fixture block.
6. the joints of optical fibre as claimed in claim 5 is characterized in that, described fixture block is taper, and the inboard of fixture block is provided with tread plate.
7. such as claim 2 or the 6 described joints of optical fibre, it is characterized in that, described nut is the taper nut, and its tapering is identical with the fixture block tapering.
8. the joints of optical fibre as claimed in claim 2 is characterized in that, the two ends of described web member are respectively equipped with connecting portion, and this connecting portion is one or both the combination in annulus, the stuck point.
9. the joints of optical fibre as claimed in claim 2 is characterized in that, the rollback distance range of described backing mechanism is 0.3-1.2mm.
10. joints of optical fibre; comprise the ceramic contact pin assembly; contact pin skeleton protective sleeve; movable protective sleeve and cable protection grip assembly; the ceramic contact pin assembly is connected movable protective sleeve and connects with the cable protection grip assembly; the outside of contact pin component is arranged with Plug pin patch bay skeleton protective sleeve; it is characterized in that; also comprise for the backing mechanism that automatically reserves the rollback distance under movable protective sleeve and the cable protective sleeve assembled state; described backing mechanism comprises and is arranged on movable protective sleeve; the cable protection grip assembly one of them at least two stopper slots and be arranged on a positioner of corresponding junction on another device; but the positioner timesharing snaps in respectively different stopper slots, and the distance of described positioner between the stuck point of different stopper slots is the rollback distance.
11. the joints of optical fibre as claimed in claim 10 is characterized in that, the rollback distance range of described backing mechanism is 0.3-1.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220395189 CN202886642U (en) | 2012-08-10 | 2012-08-10 | Optical fiber connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220395189 CN202886642U (en) | 2012-08-10 | 2012-08-10 | Optical fiber connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202886642U true CN202886642U (en) | 2013-04-17 |
Family
ID=48078053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220395189 Expired - Fee Related CN202886642U (en) | 2012-08-10 | 2012-08-10 | Optical fiber connector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202886642U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101740542B1 (en) * | 2014-10-27 | 2017-05-26 | 이노 인스트루먼트 (차이나). 인코퍼레이션 | General-purpose optical fiber connector |
| CN108333683A (en) * | 2017-11-28 | 2018-07-27 | 华兴新锐通信科技集团有限公司 | A kind of optical fiber splicer automatically moved heating bowl assembly |
-
2012
- 2012-08-10 CN CN 201220395189 patent/CN202886642U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101740542B1 (en) * | 2014-10-27 | 2017-05-26 | 이노 인스트루먼트 (차이나). 인코퍼레이션 | General-purpose optical fiber connector |
| CN108333683A (en) * | 2017-11-28 | 2018-07-27 | 华兴新锐通信科技集团有限公司 | A kind of optical fiber splicer automatically moved heating bowl assembly |
| CN108333683B (en) * | 2017-11-28 | 2023-12-19 | 华兴新锐通信科技集团有限公司 | Automatic remove optical fiber fusion splicer and use heating tank subassembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2674800A2 (en) | Access Terminal Box | |
| CN201408274Y (en) | Pre-buried optical fiber connector | |
| CN102375184B (en) | Quick optical fiber terminating assembly | |
| CN202886642U (en) | Optical fiber connector | |
| CN202210167U (en) | Hot melt type on-site assembly optical fiber movable connector | |
| CN113064237A (en) | Optical fiber cable bundling connector | |
| CN201820015U (en) | Optical fiber rapid connector | |
| CN202735548U (en) | Fiber connector | |
| CN202563124U (en) | Optical fiber connector | |
| CN202373352U (en) | Anti-skidding branch heat-shrinkable bushing | |
| CN203941313U (en) | A kind of without contact pin fiber alignment adapter and assembly thereof | |
| CN102928923B (en) | Hot-melt field-assembled optical fiber connector | |
| CN216927172U (en) | MPO optical fiber jumper wire | |
| CN104865656A (en) | Stainless-steel-pipe optical fiber unit joint and connection method thereof | |
| CN202720360U (en) | Hot-melt-type optical-fiber onsite connector | |
| CN205301625U (en) | Hot melt type quick connector | |
| CN204903813U (en) | Fibre -optical connector assembly | |
| CN102565946B (en) | Optical hot melt connector and waterproof optical fast connector | |
| CN210401740U (en) | Optical fiber fusion point protection device | |
| KR101392244B1 (en) | Apparatus and method for connecting fiber-optic drop cables | |
| CN202661671U (en) | Fiber breakage preventing clamp | |
| CN203178516U (en) | Hot-melt type optical fiber connector protective sleeve and optical fiber connector comprising same | |
| CN202815272U (en) | Optical fiber quick forming assembly | |
| CN203909339U (en) | Optical fiber fusion splicing point protection device | |
| CN102707380B (en) | Break-proof fiber clamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: INNOINSTRUMENT (WEIHAI) CO., LTD. Free format text: FORMER NAME: INNO INSTRUMENT (WEIHAI) CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 264200 Shandong city of Weihai province Weihai Dalian District Road No. 71 Patentee after: DH INFOTECH (WEIHAI) Inc. Patentee after: INNO INSTRUMENT, Inc. Address before: 264207 Shandong city of Weihai province Weihai Dalian District Road No. 71 Patentee before: INNO INSTRUMENT (WEI HAI) Inc. Patentee before: INNO INSTRUMENT, Inc. |
|
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee after: INNO INSTRUMENT (CHINA). Inc. Patentee after: INNO INSTRUMENT, Inc. Address before: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee before: INNO INSTRUMENT (WEI HAI) Inc. Patentee before: INNO INSTRUMENT, Inc. |
|
| CP03 | Change of name, title or address |
Address after: 264200 Weihai high tech Zone, Tianjin, No. 190 Shandong Road Hospital Patentee after: INNO INSTRUMENT (WEI HAI) Inc. Patentee after: INNO INSTRUMENT, Inc. Address before: 264200 Shandong city of Weihai province Weihai Dalian District Road No. 71 Patentee before: DH INFOTECH (WEIHAI) Inc. Patentee before: INNO INSTRUMENT, Inc. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20200810 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |