CN203194070U - Mini-sized pluggable module heat dissipation structure - Google Patents
Mini-sized pluggable module heat dissipation structure Download PDFInfo
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- CN203194070U CN203194070U CN 201320071743 CN201320071743U CN203194070U CN 203194070 U CN203194070 U CN 203194070U CN 201320071743 CN201320071743 CN 201320071743 CN 201320071743 U CN201320071743 U CN 201320071743U CN 203194070 U CN203194070 U CN 203194070U
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- Prior art keywords
- plug
- radiator structure
- pluggable module
- elastic carrier
- high heat
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Abstract
A mini-sized pluggable module heat dissipation structure is disclosed and is accommodated in an electronic apparatus housing. The mini-sized pluggable module heat dissipation structure comprises at least a plugging passageway and a high-heat-conduction elastic body. The plugging passageway is used for accommodating a plugging module, an end of the plugging passageway is provided with a plugging seat, the other end of the plugging passageway is provided with a plugging window, and therefore the plugging seat and the plugging module are electrically connected. The plugging passageway consists of an upper housing, a lower cover plate, the plugging window, wherein a first elastic bearing groove is formed by concaving the upper housing, and the high-heat-conduction elastic body is disposed in the first elastic bearing groove. Thus, when the plugging module enters the plugging passageway from the plugging window, the plugging module pushes and ejects the first elastic bearing groove, and therefore the high-heat-conduction elastic body is enabled to move along the pushing and ejecting direction and contact a heat dissipation device, and a quick heat dissipation aim is attained.
Description
Technical field
The utility model relates to a kind of radiator structure improvement, but refers to a kind of miniature pluggable module radiator structure of quick heat radiating especially, and this miniature pluggable module radiator structure mainly is the innovation structure design that is applied to stack miniature pluggable module field.
Background technology
The transceiver of the various kenel optical fiber of communicating by letter between known permission electronic host equipment and external device (ED) and copper cable transmission.These transceivers can be incorporated pluggable this main process equipment that is connected to into, and flexible module is provided in system configuration.This module is according to various its sizes of standard construction and compatibility, and wherein a standard is small size plug type (SFP) module standard.This SFP module is inserted and is installed in this main process equipment in the socket on the circuit board.This socket comprises elongated drawing strickle guide or the cage with the place ahead that the inner space is opened, and electric power connector is arranged at the rear of the cage in this inner space.
At present, the power consumption of Wireless Telecom Equipment is increasing, estimates that RRU of future generation or little base station will more use the SFP﹠amp of stack; The double-deck optical module of SFP+ to reduce machine volume, is the heat radiation difficult problem of optical module and use this device to bring thereupon.Because the optical module stack causes accumulation of heat, radiator area to reduce, and becomes the main heat radiation bottleneck of complete machine.
In sum, need to propose a kind of reasonable in design and effectively improve the design of above-mentioned defective.
Summary of the invention
The purpose of this utility model is, a kind of miniature pluggable module radiator structure is provided, disposes the structural design of high heat-conducting elastomer by its housing, when plug-in module enters the plug passage, make high heat-conducting elastomer contact a heat abstractor, to reach the purpose of quick heat radiating.
In order to reach above-mentioned purpose, the utility model provides a kind of miniature pluggable module radiator structure, it is placed in the case of electronic device, this miniature pluggable module radiator structure comprises: at least one plug passage, this plug passage is used for a ccontaining plug-in module, one end of this at least one plug passage is provided with a plug seat, the other end of this at least one plug passage is provided with a plug window, this plug seat electrically connects with this plug-in module, this at least one plug passage is by a upper shell, one lower cover, one plug window is formed, and this upper shell is recessed to form one first elastic carrier groove; One high heat-conducting elastomer, it is disposed in this first elastic carrier groove; Whereby, when this plug-in module when this plug window enters this plug passage, this first elastic carrier groove of this plug-in module ejection makes this high heat-conducting elastomer move and contact a heat abstractor along the ejection direction.
In the utility model one embodiment, this heat abstractor is case of electronic device or fin.
In the utility model one embodiment, this miniature pluggable module radiator structure comprises two plug passages, and two guide plates were formed about described two plug passages were reached by this upper shell, this lower cover, two plug windows.
In the utility model one embodiment, this upper shell is combined by upper cover plate and two side plates, and this upper cover plate, described two guide plates and this lower cover are fixedly arranged on described two side plates with manner, and this lower cover is installed on the pcb board.
In the utility model one embodiment, the distance of guide plate is gone up less than the thickness of this plug-in module with this in the bottom of this first elastic carrier groove.
In the utility model one embodiment, this upper cover plate is recessed to form this first elastic carrier groove, one surface of this high heat-conducting elastomer is attached at the groove bottom of this first elastic carrier groove, and another surface of this high heat-conducting elastomer has a space with the inner surface of this heat abstractor.
In the utility model one embodiment, this upper cover plate offers two mutual loam cake joint-cuttings parallel to each other, and this first elastic carrier groove is formed between described two loam cake joint-cuttings.
In the utility model one embodiment, this upper cover plate also offers two mutual loam cake cracks parallel to each other, described two loam cake cracks are parallel with described two loam cake joint-cuttings, and described two loam cake cracks lay respectively at the both sides of this first elastic carrier groove near the edge of this upper cover plate.
In the utility model one embodiment, this lower cover is recessed to form one second elastic carrier groove, and in order to dispose another high heat-conducting elastomer, the bottom of this second elastic carrier groove and the distance of this time guide plate are less than the thickness of this plug-in module.
In the utility model one embodiment, a surface of this another high heat-conducting elastomer is attached at the groove bottom of this second elastic carrier groove, another this pcb board of surface contact of this another high heat-conducting elastomer.
In the utility model one embodiment, this lower cover offers two mutual lower cover joint-cuttings parallel to each other, and this first elastic carrier groove is formed between described two lower cover joint-cuttings.
In the utility model one embodiment, this high heat-conducting elastomer and this another high heat-conducting elastomer be the high heat-conducting elastomer for being made by soft Heat Conduction Material all.
In the utility model one embodiment, this soft Heat Conduction Material by be selected from heat conductive silica gel, rubber-like metal, rubber-like nonmetal a kind of soft Heat Conduction Material in the formation group.
The utility model has following advantage at least: the utility model is about a kind of miniature pluggable module radiator structure, and as media, the heat energy that plug-in module is produced is directly conducted to case of electronic device by high heat-conducting elastomer for it, and scatters and disappears via air.
More than be in order to for example and explain principle of the present utility model about the explanation of the explanation of the utility model content and following execution mode, and provide claim scope of the present utility model further to explain.
Description of drawings
Fig. 1 is the three-dimensional combination figure of the utility model miniature pluggable module radiator structure;
Fig. 2 A is the three-dimensional exploded view of the utility model miniature pluggable module radiator structure;
Fig. 2 B is the three-dimensional exploded view of another angle of the utility model miniature pluggable module radiator structure;
Fig. 3 A is the operation chart () of the utility model miniature pluggable module radiator structure; And
Fig. 3 B is the operation chart (two) of the utility model miniature pluggable module radiator structure.
Wherein, description of reference numerals is as follows:
1 miniature pluggable module radiator structure
11 upper shells
111 upper cover plates
111a loam cake joint-cutting
111b loam cake crack
112 first elastic carrier grooves
The 112a bottom
The 112b groove bottom
113 side plates
12 lower covers
121 second elastic carrier grooves
The 121a bottom
The 121b groove bottom
122 lower cover joint-cuttings
13 plug windows
14 plug passages
15A, the 15B plug-in module
The 151A end face
The 151B bottom surface
16 plug seats
Guide plate on 17
18 times guide plates
2 high heat-conducting elastomers
3 heat abstractors
31 inner surfaces
4 pcb boards
The L1 distance
The L2 distance
W thickness
The S space
Embodiment
Below described embodiment mention quantity or its fellow, unless otherwise mentioned, otherwise application category of the present utility model should not be subjected to its quantity or its fellow's restriction.Use in miniature pluggable module radiator structure 1 of the present utility model is specially adapted to the not have fan casing of (fanless).
Please refer to Fig. 1 and Fig. 2, the utility model provides a kind of miniature pluggable module radiator structure 1, and it is placed in the case of electronic device (not shown), and the utility model comprises at least one plug passage 14 and a high heat-conducting elastomer 2.As shown in Figure 1, described plug passage 14 is for a ccontaining plug-in module 15A, and an end of plug passage 14 is provided with a plug seat 16, and the other end of plug passage 14 is provided with a plug window 13, be electrically connected to each other with plug-in module 15A for plug seat 16, to carry out signal transmission conducting.As shown in Figure 2, plug passage 14 can be made up of a upper shell 11, a lower cover 12 and a plug window 13; Wherein, upper shell 11 has been recessed to form one first elastic carrier groove 112, in order to dispose high heat-conducting elastomer 2.Whereby, when desire enters plug during passage 14 with plug-in module 15A from plugging window 13, but the plug-in module 15A ejection first elastic carrier groove 112 makes this high heat-conducting elastomer 2 move and contact a heat abstractor 3 (as Fig. 3 A and Fig. 3 B) along the ejection direction; More specifically, because by the high heat-conducting elastomer 2 of the first elastic carrier groove, 112 extruding, force high heat-conducting elastomer 2 contacts and be sealed at heat abstractor 3, at this moment, the heat energy that plug-in module 15A can be produced by high heat-conducting elastomer 2 characteristics own is directly conducted to heat abstractor 3, and lost via air, to reach the purpose of quick heat radiating.In addition, the utility model is to replace the mode (mode that namely replaces thermal convection by heat conducting mode) that the fan heat radiation is set in the traditional electronic devices housing by high heat-conducting elastomer 2, so not only can effectively utilize the inner space of case of electronic device, the more electric energy consume when reducing because of fan running, and then increase the service time of plug-in module 15A and keep away the noise that produces when tradition is exempted from fan running.
Below in detail specific embodiment of the utility model will be described in detail, please refer to Fig. 1 to Fig. 2 B, Fig. 1 is the three-dimensional combination figure of the utility model miniature pluggable module radiator structure, Fig. 2 A is the three-dimensional exploded view of the utility model miniature pluggable module radiator structure, and Fig. 2 B then is the three-dimensional exploded view of another angle of the utility model miniature pluggable module radiator structure.The utility model provides a kind of miniature pluggable module radiator structure 1, its upper shell 11 can integrally formed mode be bent to form two side plates 113 downwards, and make upper shell 11 present the ㄇ font structure, and upper cover plate 111 and lower cover 12 are fixedly arranged on two side plates 113 with manner, or upper shell 11 combines by a upper cover plate 111 and two side plates 113, with at least one plug passage 14 of common formation.Shown in Fig. 1 to Fig. 2 B, the utility model miniature pluggable module radiator structure 1 has two plug passages 14, and each plugs passage 14 and is used for a ccontaining plug-in module 15A (or 15B); Wherein, this two plugs passage 14 reaches 17,18 compositions of two guide plates up and down by upper shell 11, lower cover 12, two plug windows 13, and lower cover 12 is installed on the pcb board 4.It should be noted that, because upper cover plate 111, lower cover 12 and two side plates 113 are for disassembling the Combination Design of formula, so but upper cover plate 111, lower cover 12 and two side plates, 113 fluid-tight engagement are firm, make structural strength not be subject to the external force influence and produce be out of shape, more can effectively increase fitting tightly of high heat-conducting elastomer 2 and heat abstractor 3 (as Fig. 3 A), make high heat-conducting elastomer 2 reach radiating effect fast, also can not influence inner plug-in module 15A, the signal of 15B transmits, make plug-in module 15A relatively, the transmission speed quality of 15B is better, and characteristic functions is more stable.
See also Fig. 2 A and Fig. 2 B, the upper cover plate 111 of upper shell 11 is recessed to form the first elastic carrier groove 112, in order to dispose high heat-conducting elastomer 2; Wherein, because a surface of high heat-conducting elastomer 2 is attached at the groove bottom 112b of the first elastic carrier groove 112, so high heat-conducting elastomer 2 can form with upper shell 11 and fit tightly, make high heat-conducting elastomer 2 can not be subjected to the influence of external force and rock, balanced action reaches best effect.In addition, upper cover plate 111 offers two mutual loam cake joint-cutting 111a parallel to each other, can make the first elastic carrier groove 112 that is formed between the two loam cake joint-cutting 111a can do the elastic displacement of a suitable distance up and down; Wherein, can be by adjusting the distance that above-mentioned each loam cake joint-cutting 111a extends towards the rear and front end of upper cover plate 111, adjust the first elastic carrier groove flexible displacement variable about in the of 112.Moreover upper cover plate 111 more can offer two mutual loam cake crack 111b parallel to each other; Wherein, two loam cake crack 111b are parallel with two loam cake joint-cutting 111a, and two loam cake crack 111b lay respectively at the both sides of the first elastic carrier groove 112 near the edge of upper cover plate 111, whereby, can be by adjusting the distance that above-mentioned each loam cake crack 111b extends towards the rear and front end of upper cover plate 111, adjust upper cover plate flexible displacement variable about in the of 111.More specifically, the elastic displacement up and down of the first elastic carrier groove 112 can decide by the length of length collocation adjustment those loam cake cracks 111b that adjusts those loam cake joint-cuttings 111a, so the upper and lower displacement amount of high heat-conducting elastomer 2 is adjusted in visual actual demand flexibly.The bottom 112a of the described first elastic carrier groove 112 and the distance L 1 of last guide plate 17 are less than the thickness W (Fig. 3 A) of plug-in module 15.
Shown in Fig. 2 A and Fig. 2 B, the utility model miniature pluggable module radiator structure 1 more can be recessed to form one second elastic carrier groove 121 in lower cover 12, in order to dispose another high heat-conducting elastomer 2, to increase the radiating efficiency of lower cover 12; Wherein, lower cover 12 offers two mutual lower cover joint-cuttings 122 parallel to each other, can make the second elastic carrier groove 121 that is formed between the two lower cover joint-cuttings 122 do the elastic displacement of a suitable distance up and down, similarly, also can be by adjusting the distance that above-mentioned each lower cover joint-cutting 122 extends towards the rear and front end of lower cover 12, limit the second elastic carrier groove flexible displacement variable about in the of 121.The bottom 121a of the described second elastic carrier groove 121 and the thickness W (Fig. 3 A) of the distance L 2 of following guide plate 18 less than plug-in module 15, and a surface of described another high heat-conducting elastomer 2 is attached at the groove bottom 121b of the second elastic carrier groove 121, another surface contact pcb board 4 of described another high heat-conducting elastomer 2.
It should be noted that described high heat-conducting elastomer 2 made by soft Heat Conduction Material; Wherein, this soft Heat Conduction Material is selected from that heat conductive silica gel, rubber-like metal, rubber-like are nonmetal to constitute a kind of in the group; In this specific embodiment, preferably, described high heat-conducting elastomer 2 can be the heat conductive silica gel with high compression characteristic and high thermal conductivity energy, is applicable to the low-pressure applications environment, make plug-in module 15A, 15B can plug relatively that passage 14 carries out repeatedly withdrawing and the elasticity that do not influence high heat-conducting elastomer 2; Wherein, described heat conductive silica gel more can add other electric insulation materials of tool good thermal conductivity characteristic.In addition, because described heat conductive silica gel has good attaching for metal (as upper cover plate 111 and lower cover 12), and its viscosity is unlikely to too high, so be conducive to replacement and the maintenance of disassembling or carry out described heat conductive silica gel of the utility model miniature pluggable module radiator structure 1 in the future.Moreover, owing to described heat conductive silica gel has elasticity, so as plug-in module 15A, when 15B entered plug passage 14, because plug-in module 15A, 15B was equivalent to be coated in the rubber-like heat conductive silica gel, therefore can reach functions such as absorbing vibration, reduction noise.
See also shown in Fig. 3 A to 3B, Fig. 3 A is the operation chart () of the utility model miniature pluggable module radiator structure, and Fig. 3 B then is the operation chart (two) of the utility model miniature pluggable module radiator structure; As shown in Figure 3A, heat abstractor 3 can be case of electronic device or fin, and high heat-conducting elastomer 2 has a space S with heat abstractor 3.For instance, when heat abstractor 3 is this case of electronic device, because the bottom 112a of the first elastic carrier groove 112 and the distance L 1 of last guide plate 17 are less than plug-in module 15A, the thickness W of 15B, and the bottom 121a of the second elastic carrier groove 121 and the distance L 2 of following guide plate 18 are less than plug-in module 15A, the thickness W of 15B, so shown in Fig. 3 B, as plug-in module 15A, when 15B enters plug passage 14 via the plug window, the bottom 112a of the end face 151A of plug-in module 15A and the bottom surface 151B of the plug-in module 15B difference ejection first elastic carrier groove 112 and the bottom 121a of the second elastic carrier groove 121, and then drive is attached at the high heat-conducting elastomer 2 (heat conductive silica gel) of the first elastic carrier groove 112 to top offset one segment distance, make high heat-conducting elastomer 2 enter space S and also support the inner surface 31 that is affixed on case of electronic device, and drive is attached at the high heat-conducting elastomer 2 (heat conductive silica gel) of the second elastic carrier groove 121 to bottom offset contact pcb board 4; Then, continue to move up by the first elastic carrier groove 112, and the second elastic carrier groove 121 continues to move down, high heat-conducting elastomer 2 (heat conductive silica gel) is by the inner surface 31 of the groove bottom 112b of the first elastic carrier groove 112 and case of electronic device extruding diffusion and be placed in the first elastic carrier groove 112, and another high heat-conducting elastomer 2 (heat conductive silica gel) is then by the groove bottom 121b of the second elastic carrier groove 121 and pcb board 4 extruding diffusions and be placed in the second elastic carrier groove 121; At last, plug-in module 15A, 15B electrically connects with plug seat 16.Because high heat-conducting elastomer 2 (heat conductive silica gel) itself has elasticity, increase heat-conducting area so not only can be extruded diffusion, more can evenly cover irregular this case of electronic device surface, the groove bottom 112b of the first elastic carrier groove 112, the groove bottom 121b of the second elastic carrier groove 121 reaches, so heat energy that plug-in module 15 produces when work, can conduct to case of electronic device or pcb board 4 fast by high heat-conducting elastomer 2 (heat conductive silica gel), and fast heat energy is dissipated to atmosphere by case of electronic device or pcb board 4, heat dissipation is significantly improved, so have the reduction temperature, advantages such as the efficient of the transmission speed of raising photoelectricity and lifting plug-in module 15 and useful life.Described case of electronic device is to can be to adopt metal material to make.
In addition, what will specify here is, the direction term that the utility model is mentioned, and for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use be the explanation and be not to limit the utility model.
Be with, have characteristics described as follows and function by miniature pluggable module radiator structure of the present utility model:
One, miniature pluggable module radiator structure of the present utility model, it is as media by high heat-conducting elastomer, the heat energy that plug-in module is produced is directly conducted to the electronic installation metal shell, characteristic by high heat-conducting elastomer itself, the heat energy that plug-in module is produced is directly conducted to whole metal shell, and scatters and disappears via air.
Two, miniature pluggable module radiator structure of the present utility model, the loam cake joint-cutting that its upper cover plate is offered, can make the first elastic carrier groove that is formed between loam cake two joint-cuttings can do the elastic displacement of a suitable distance up and down, and the length of the whole loam cake joint-cutting of secondment is to control the first elastic carrier groove flexible displacement variable up and down.
Three, miniature pluggable module radiator structure of the present utility model, its upper cover plate, lower cover and two side plates are the Combination Design of the formula of disassembling, produce distortion so can make overall construction intensity not be subject to the external force influence, effectively increase fitting tightly of high heat-conducting elastomer and heat abstractor, reach radiating effect fast.
In sum, the real important document that has met utility model patent of the utility model is filed an application in accordance with the law.Only above disclosed content only is the utility model preferred embodiment, and from not limiting interest field of the present utility model with this, therefore the equalization of doing according to the utility model claim changes or modifies, and still belongs to the scope that the utility model is contained.
Claims (13)
1. miniature pluggable module radiator structure, it is placed in the case of electronic device, it is characterized in that, and this miniature pluggable module radiator structure comprises:
At least one plug passage, this plug passage is used for a ccontaining plug-in module, one end of this at least one plug passage is provided with a plug seat, the other end of this at least one plug passage is provided with a plug window, this plug seat electrically connects with this plug-in module, this at least one plug passage is made up of a upper shell, a lower cover and a plug window, and this upper shell is recessed to form one first elastic carrier groove;
One high heat-conducting elastomer, it is disposed in this first elastic carrier groove;
Whereby, this plug-in module makes this high heat-conducting elastomer move and contact a heat abstractor along the ejection direction at this plug-in module this first elastic carrier groove of ejection when this plug window enters this plug passage.
2. miniature pluggable module radiator structure as claimed in claim 1, it is characterized in that: this heat abstractor is case of electronic device or fin.
3. miniature pluggable module radiator structure as claimed in claim 2, it is characterized in that: this miniature pluggable module radiator structure comprises two plug passages, and two guide plates were formed about described two plug passages were reached by this upper shell, this lower cover, two plug windows.
4. miniature pluggable module radiator structure as claimed in claim 3, it is characterized in that: this upper shell is combined by upper cover plate and two side plates, this upper cover plate, described two guide plates and this lower cover are fixedly arranged on described two side plates with manner, and this lower cover is installed on the pcb board.
5. miniature pluggable module radiator structure as claimed in claim 4 is characterized in that: the bottom of this first elastic carrier groove and the thickness of the distance of being somebody's turn to do last guide plate less than this plug-in module.
6. miniature pluggable module radiator structure as claimed in claim 5, it is characterized in that: this upper cover plate is recessed to form this first elastic carrier groove, one surface of this high heat-conducting elastomer is attached at the groove bottom of this first elastic carrier groove, and another surface of this high heat-conducting elastomer has a space with the inner surface of this heat abstractor.
7. miniature pluggable module radiator structure as claimed in claim 6, it is characterized in that: this upper cover plate offers two mutual loam cake joint-cuttings parallel to each other, and this first elastic carrier groove is formed between described two loam cake joint-cuttings.
8. miniature pluggable module radiator structure as claimed in claim 7, it is characterized in that: this upper cover plate also offers two mutual loam cake cracks parallel to each other, described two loam cake cracks are parallel with described two loam cake joint-cuttings, and described two loam cake cracks lay respectively at the both sides of this first elastic carrier groove near the edge of this upper cover plate.
9. miniature pluggable module radiator structure as claimed in claim 7, it is characterized in that: this lower cover is recessed to form one second elastic carrier groove, in order to dispose another high heat-conducting elastomer, the bottom of this second elastic carrier groove and the distance of this time guide plate are less than the thickness of this plug-in module.
10. miniature pluggable module radiator structure as claimed in claim 9 is characterized in that: a surface of this another high heat-conducting elastomer is attached at the groove bottom of this second elastic carrier groove, another this pcb board of surface contact of this another high heat-conducting elastomer.
11. miniature pluggable module radiator structure as claimed in claim 10 is characterized in that: this lower cover offers two mutual lower cover joint-cuttings parallel to each other, and this first elastic carrier groove is formed between described two lower cover joint-cuttings.
12. miniature pluggable module radiator structure as claimed in claim 1 is characterized in that: this high heat-conducting elastomer and this another high heat-conducting elastomer be the high heat-conducting elastomer for being made by soft Heat Conduction Material all.
13. miniature pluggable module radiator structure as claimed in claim 12 is characterized in that: this soft Heat Conduction Material by be selected from heat conductive silica gel, rubber-like metal, rubber-like nonmetal a kind of soft Heat Conduction Material in the formation group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320071743 CN203194070U (en) | 2013-02-07 | 2013-02-07 | Mini-sized pluggable module heat dissipation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320071743 CN203194070U (en) | 2013-02-07 | 2013-02-07 | Mini-sized pluggable module heat dissipation structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203194070U true CN203194070U (en) | 2013-09-11 |
Family
ID=49110889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320071743 Expired - Fee Related CN203194070U (en) | 2013-02-07 | 2013-02-07 | Mini-sized pluggable module heat dissipation structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203194070U (en) |
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2013
- 2013-02-07 CN CN 201320071743 patent/CN203194070U/en not_active Expired - Fee Related
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Granted publication date: 20130911 Termination date: 20190207 |
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| CF01 | Termination of patent right due to non-payment of annual fee |