CN202916762U - Electronic equipment provided with Hall device - Google Patents
Electronic equipment provided with Hall device Download PDFInfo
- Publication number
- CN202916762U CN202916762U CN 201220594805 CN201220594805U CN202916762U CN 202916762 U CN202916762 U CN 202916762U CN 201220594805 CN201220594805 CN 201220594805 CN 201220594805 U CN201220594805 U CN 201220594805U CN 202916762 U CN202916762 U CN 202916762U
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- China
- Prior art keywords
- apparatus body
- over cap
- electronic equipment
- described apparatus
- hall device
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- Expired - Lifetime
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Abstract
The utility model provides electronic equipment provided with a Hall device. The equipment comprises an equipment body, a processor arranged in the equipment body and a display screen arranged on a first surface of the equipment body. The equipment further comprises the Hall device, a protective cover and an induced magnet, wherein the Hall device is arranged in the equipment body and connected with the processor, the protective cover is arranged on the equipment body, the protective cover covers the first surface of the equipment body when being on a first position relative to the equipment body, the first surface of the equipment body is exposed when the protective cover is on a second position relative to the equipment body, the induced magnet is arranged on the surface or the inside of the protective cover, and changes of magnetic field positions of the Hall device relative to the induced magnet are achieved according to position changes of the protective cover relative to the equipment body. Due to the position changes of the protective cover, wake-up and locking of the display screen are achieved, performance is stable, and use time is long.
Description
Technical field
The utility model relates to electronic device field, relates in particular to a kind of electronic equipment with hall device.
Background technology
Along with the development of science and technology, intelligent and attractive in appearanceization become two developing directions of portable terminal, especially take touch screen smart mobile phone, panel computer, video/audio player etc. as main, again especially with intelligent touch-screen mobile phone for very.Along with the screen of touch-screen mobile phone is increasing, thickness is more and more thinner, and is just more careful to the protection of mobile phone screen.
The Optimal action of protection mobile phone is to add containment vessel or protective sleeve to mobile phone at present; have the over cap that covers described mobile phone screen, but like this when waking screen up, need manually just can light screen by the Power button; increase the step that mobile phone display screen wakes up, caused mobile phone to use loaded down with trivial details.At present best solution is to add the Sensor sensor in equipment, and by photosensitive, the change of external conditions such as pressure-sensitive realizes lock-screen when over cap covers, and screen wakes up and lights when removing over cap.
But the Sensor sensor is subjected to ambient light strong and weak, and the such environmental effects such as pressure condition are larger, and unstable properties sometimes still needing to cause manually just can lighting by the Power button waking screen up.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of electronic equipment, and the change in location by over cap realizes waking up and locking of display screen, and stable performance, and service time is long.
In order to solve above technical matters, the utility model provides a kind of electronic equipment, comprises apparatus body, is arranged on the processor in the described apparatus body, and the display screen that is arranged on described apparatus body first surface, also comprises:
Hall device is arranged at described apparatus body inner, and connects described processor;
Over cap is arranged on the described apparatus body, and when described over cap was in primary importance with respect to described apparatus body, described over cap hid the first surface of described apparatus body; When described over cap was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared;
Induced magnet be arranged at described over cap surface or inner, and when described over cap was in primary importance with respect to described apparatus body, described hall device was positioned at the magnetic field of described induced magnet; When described over cap was in the second place with respect to described apparatus body, described hall device was positioned at outside the described induced magnet magnetic field.
Preferably, while described over cap be articulated in described apparatus body.
Preferably, described over cap comprises, nesting part and panel; Described nesting part comprises the housing with an opening of base plate and sidewall and described base plate and sidewall formation, and described apparatus body is nested in the described housing, and the opening of described housing and the first surface of described apparatus body are complementary;
When described panel was in primary importance with respect to described apparatus body, described panel hid the first surface of described apparatus body; When described panel was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared by described opening.
Preferably, described over cap is plastic protection cover, corium over cap or PU over cap.
Preferably, described hall device is arranged at the inside of described apparatus body, and is positioned at the upper right quarter of described apparatus body.
Preferably, described electronic equipment is mobile phone, panel computer, notebook computer or video player.
Preferably, described electronic equipment is mobile phone, panel computer.
The prior art of comparing; the electronic equipment that the utility model provides is by being provided with hall device in apparatus body; be provided with induced magnet on described over cap surface or inside; relative position by over cap and described apparatus body changes; and when described over cap is in primary importance with respect to described apparatus body; described hall device is positioned at the magnetic field of described induced magnet; electronics by described hall device is subject to Lorentz force to be assembled; thereby produce an electric field in the direction that electronics is assembled; this electric field will make electronics afterwards be subject to the electric power effect and balance the Lorentz force that cause in magnetic field; so that electronic energy afterwards not be smoothly by being offset, i.e. Hall effect.By processor calculate the Hall voltage value and described preset value compares, realize waking up and closing of touch screen displays.Because the utility model uses the magnetic field intensity of hall device detection induced magnet, so it is less can not to be subject to the impact of external environment, the signal stabilization of detection, stable performance prolongs electronic equipment serviceable life.
Description of drawings
Fig. 1 is the schematic diagram structural representation of the described over cap 200 of embodiment of a kind of electronic equipment of the utility model when being in the second place with respect to apparatus body 100;
Fig. 2 is the another kind of structural representation of the described over cap 200 of embodiment of a kind of electronic equipment of the utility model when being in the second place with respect to apparatus body 100;
Fig. 3 is that the described over cap 200 of embodiment of a kind of electronic equipment of the utility model illustrates intention when being in primary importance with respect to apparatus body 100;
Fig. 4 is the structural representation of the described over cap 200 of embodiment of a kind of electronic equipment of the utility model when being in primary importance with respect to apparatus body 100;
Fig. 5 is the position view of induced magnet and hall device among embodiment of a kind of electronic equipment of the utility model;
The first profiled sheeting and the second profiled sheeting schematic diagram among the embodiment of a kind of electronic equipment that Fig. 6 provides for the utility model.
Embodiment
In order further to understand the utility model, below in conjunction with embodiment preferred embodiment of the present utility model is described, but should be appreciated that these are described just is the restriction that further specifies feature and advantage of the present utility model rather than the utility model patent is required.
The Hall effect of indication refers to have electric current to pass through when solid conductor in the utility model, and is placed in the magnetic field vertical with electric field, and the electric charge carrier in the conductor is subject to Lorentz force and secundly produces voltage then.
The processor of indication is for realizing the electronic component of electronic equipment computing, processing, signal reception and signal sending function in the utility model.
The hall device of the utility model indication is for utilizing Hall effect, by measuring Hall voltage or electromotive force and voltage value signal being transferred to the electronic component of processor.
In intelligent mobile terminal, use at present the touch screen display screens more; most containment vessel does not possess the function of waking and closing touch screen displays up; what can realize this function also is owing to being provided with the Sensor sensor in portable terminal; covering by over cap and removing; obtain light signal or pressure signal; light signal and pressure signal are converted into electric signal by the Sensor sensor, and processor is accepted electric signal, waking up and closing by s operation control touch screen display screen.But the Sensor sensor is subject to the impact of environment for use; its light signal or pressure signal are unstable; cause to wake or to close screen up by the evolution of over cap; cause screen to be in for a long time wake-up states; not only take electricity; and shortened serviceable life of touch screen displays, in order to solve the problems of the technologies described above, the utility model provides following technical scheme:
A kind of electronic equipment comprises apparatus body, is arranged on the processor in the described apparatus body, and the display screen that is arranged on described apparatus body first surface, also comprises:
Hall device is arranged at described apparatus body inner, and connects described processor;
Over cap is arranged on the described apparatus body, and when described over cap was in primary importance with respect to described apparatus body, described over cap hid the first surface of described apparatus body; When described over cap was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared;
Induced magnet be arranged at described over cap surface or inner, and when described over cap was in primary importance with respect to described apparatus body, described hall device was positioned at the magnetic field of described induced magnet; When described over cap was in the second place with respect to described apparatus body, described hall device was positioned at outside the described induced magnet magnetic field.
The electronic equipment that the utility model provides is provided with hall device at apparatus body, on the over cap surface or containment vessel inside be provided with induced magnet.Relative position by over cap and described apparatus body changes; and when described over cap is in primary importance with respect to described apparatus body; described hall device is positioned at the magnetic field of described induced magnet; electronics by described hall device is subject to Lorentz force to be assembled; thereby produce an electric field in the direction that electronics is assembled; this electric field will make electronics afterwards be subject to the electric power effect and balance the Lorentz force that cause in magnetic field; so that electronic energy afterwards not be smoothly by being offset, this is called Hall effect.And the built-in voltage that produces is called Hall voltage.
Suppose that described hall device is a rectangular parallelepiped, length is respectively a, b, d, and magnetic field is perpendicular to the ab plane.When the direction of electric current through the ad plane, electric current I=nqv (ad), and n is electric density.If Hall voltage is V
H, hall device is V along the electric field of Hall voltage direction
H/ a.If magnetic field intensity is B, v is electric charge speed, q is the quantity of electric charge.Calculating can obtain Hall voltage, below is the computing formula of Hall voltage.When electric field force equates with Lorentz force during Fe=Fm
F
e=F
m
qV
H/a=qvB
V
H/a=BI/(nqad)
V
H=BI(nqd)。
After hall device obtains magnetic field intensity, current and voltage signals, described voltage signal is transferred to processor, then described processor calculates according to above-mentioned formula, draws Hall voltage and carries out the output of control signal by default value, and the control touch screen displays is automatically waken up or closed.When described over cap is in primary importance with respect to described apparatus body; described hall device is positioned at the magnetic field of described induced magnet; hall device obtains the parameter signals such as magnetic field intensity; and be transferred to processor; processor is by calculating Hall voltage; compare as non-zero with Hall voltage value default in the processor, the touch screen display screen is closed.When described over cap is in the second place with respect to described apparatus body; described hall device is positioned at outside the magnetic field of described induced magnet; at this moment; the magnetic field intensity parameter that hall device obtains is 0; hall sensing voltage also is 0; processor by with default Hall voltage value be 0 relatively, then touch screen displays is waken up.
Preferred described Hall voltage is a series of preset value, and processor compares by size and its preset value of the Hall voltage that draws, thereby realizes adjusting screen intensity, and when reaching the maximum preset value, touch screen displays is closed fully, and namely brightness is minimum.Otherwise along with magnetic field intensity weakens gradually, the Hall voltage value also reduces gradually, and the touch screen displayed value is adjusted brightness gradually to maximum.When hall device progressed into and withdraw from magnetic field, processor can be adjusted the brightness of touch screen displays gradually like this, thereby so that described touch screen displays can not cause short circuit because of unexpected waking up and close, had prolonged the serviceable life of screen.
Referring to Fig. 1, show a kind of structural representation of an embodiment of a kind of electronic equipment of the utility model, Fig. 2 shows the another kind of structural representation of an embodiment of a kind of electronic equipment of the utility model, and described electronic equipment can comprise:
Wherein, processor is arranged in the apparatus body 100, described apparatus body 100 namely be described electronic equipment for the treatment of and output result chief component, it is except comprising the processor described in the present embodiment, must also comprise the storer, transmitter, receiver and other necessary the electric circuit constitute components and parts and other hardware configurations that set within it, type according to electronic equipment is different and different in addition, can also comprise display, loudspeaker, sensor.
Described over cap 200 is arranged on the described apparatus body 100, and it can protect described apparatus body 100.When this over cap 200 is in primary importance with respect to described apparatus body 100, hide the first surface 101 of described apparatus body 100; When this over cap 200 was in the second place with described apparatus body 100 relatively, the first surface 101 of this apparatus body appeared.Also be the first surface that over cap can be protected apparatus body, if described apparatus body comprises display screen, then this display screen can be positioned at the apparatus body first surface, thereby can protect described display screen.Described
Described primary importance and the second place are two kinds of different conditions of the relative and described apparatus body of described over cap; the wherein said second place can refer to as long as described over cap does not hide described apparatus body first surface; make the exposed of living in arbitrary position of this first surface, it is not to limit a certain concrete position.
Schematic diagram when Fig. 1 and Fig. 2 are described over cap 200 and relatively are in the different second place from apparatus body 100;
Fig. 3 and Fig. 4 are the schematic diagram of described over cap 200 when being in primary importance with respect to apparatus body 100, and dotted portion is the first surface of the described apparatus body that hidden by described over cap.
A kind ofly may situation be: described over cap and this apparatus body be hinged, thereby by turning cover or do not hide the first surface of described apparatus body.
Another kind of possibility situation be: described over cap comprises, nesting part and panel; Described nesting part comprises the housing with an opening of base plate and sidewall and described base plate and sidewall formation, and described apparatus body is nested in the described housing, and the opening of described housing and the first surface of described apparatus body are complementary;
When described panel was in primary importance with respect to described apparatus body, described panel hid the first surface of described apparatus body; When described panel was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared by described opening.
Panel rotates along apparatus body one side, it can be in close, and namely seals described apparatus body, blocks the state of its first surface, perhaps is in and opens, the state that the apparatus body first surface is exposed.
Certainly the structural relation of over cap and apparatus body is not limited in above-mentioned two situations.Described over cap can also be integrated with described apparatus body.
Described hall device and processor are arranged in the apparatus body 100; described induced magnet is arranged on over cap 200 surfaces or inner; can detect over cap 200 and change with respect to apparatus body 100 different magnetic fields that residing position forms, thereby Hall voltage value and the default Hall voltage value calculated by processor compare.When described over cap 200 is in described primary importance, can make and process the operation of operating body under the first steer mode; When described over cap 200 is in the described second place, can process the operation of operating body under the second operator scheme.Described the first steer mode is different with described the second steer mode; apparatus body received the pattern of operating body operation when described the first steer mode can refer to that over cap is in primary importance; for example screen is closed; apparatus body received the pattern of operating body operation when the second steer mode can refer to that over cap is in the second place, and namely screen wakes up.
Wherein, when over cap 200 was in diverse location, processor worked in the operation that different tupes is processed operating body.When over cap 200 was positioned at described primary importance, processor worked in the first tupe and processes the operation of operating body under the first steer mode.When over cap 200 switched to the second place by primary importance, then processor namely switched to the second tupe by the first tupe and processes the operation of operating body under the second steer mode.Vice versa, and when namely over cap switched to primary importance by the second place, processor namely switched to the first tupe from the second tupe.
Wherein, processor is processed the operation of operating body under the first steer mode; perhaps process the operation of operating body under the second operator scheme concrete; to described apparatus body according to operating body; the steering order that perhaps by over cap the operation of described apparatus body is triggered, the corresponding business processing of carrying out according to steering order.
For example; described electronic equipment be panel computer, mobile phone or music player or video player, notebook computer etc. be provided with over cap have the equipment of touch-screen the time; when detecting over cap, processor is in primary importance; when hiding the touch-screen of electronic equipment; switch to the first tupe; close touch-screen, but touch sensing unit is in running order.This moment, over cap and described touch-screen were complementary, the relevant position on the touching over cap, and processor can receive the contact information that produces by over cap touching touch-screen.When solicit operation corresponding to described contact information, as open a certain application program of electronic equipment, when perhaps starting a certain function of electronic equipment, processor namely can be carried out this solicit operation.
Again for example; (described button just provides the feel of pressing to the user when being provided with the button of the corresponding induction region of corresponding touch-screen on the over cap; namely provide the user to press the button the anchorage force of pointing to the user to the user); can be by pressing the corresponding button on the over cap; to processor transmission request; open the music playback function music playing of electronic equipment such as request, and by pressing other buttons on the over cap, request is selected to volume, tonequality, song switching etc.Specific function when certainly electronic equipment also can arrange corresponding over cap and is in primary importance when detecting over cap and be in primary importance, namely starts music player, and music player can temporarily not exported song.When detecting the first steering order that operation questions triggers by operation protection lid, trigger music player output song and can carry out song selection, the operations such as volume adjusting according to the first steering order.Thereby reach the demand of the blind control of user, namely the user need not see that this electronic equipment just can realize the operation to button.
When if over cap is in the second place certainly; electronic equipment has namely started certain application; when then over cap switches to primary importance; described processor can cut out this application; perhaps continue this application of operation; and detect the operation of the operation of apparatus body being controlled this application by over cap, for example this is applied as the music application.When over cap was in primary importance, the user can continue control is selected in this application by over cap, thereby processor can continue the selection operation according to the user, processes accordingly.
According to the utility model, described over cap can be plastic protection cover, corium over cap or PU over cap, and the utility model is not specifically limited.In addition as shown in Figure 5; it is inner that described induced magnet 201 preferably is embedded in described over cap; described hall device 103 is preferably disposed on the upper right corner of described apparatus body; when described over cap is relative with described apparatus body when being in the second place; described induced magnet and described hall device relative position also are complementary; and preferably under the described second place; described induced magnet also is positioned at the upper left corner of described over cap; and when over cap was positioned at the second place, described hall device all was arranged in the magnetic field of described induced magnet.
Above a kind of electronic equipment with hall device that the utility model is provided is described in detail; having used specific case herein sets forth principle of the present utility model and embodiment; the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also carry out some improvement and modification to the utility model, these improvement and modification also fall in the protection domain of the utility model claim.
Claims (7)
1. the electronic equipment with hall device comprises apparatus body, is arranged on the processor in the described apparatus body, and the display screen that is arranged on described apparatus body first surface, it is characterized in that, also comprises:
Hall device is arranged at described apparatus body inner, and connects described processor;
Over cap is arranged on the described apparatus body, and when described over cap was in primary importance with respect to described apparatus body, described over cap hid the first surface of described apparatus body; When described over cap was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared;
Induced magnet be arranged at described over cap surface or inner, and when described over cap was in primary importance with respect to described apparatus body, described hall device was positioned at the magnetic field of described induced magnet; When described over cap was in the second place with respect to described apparatus body, described hall device was positioned at outside the described induced magnet magnetic field.
2. electronic equipment according to claim 1 is characterized in that, while described over cap be articulated in described apparatus body.
3. electronic equipment according to claim 1 is characterized in that, described over cap comprises, nesting part and panel; Described nesting part comprises the housing with an opening of base plate and sidewall and described base plate and sidewall formation, and described apparatus body is nested in the described housing, and the opening of described housing and the first surface of described apparatus body are complementary;
When described panel was in primary importance with respect to described apparatus body, described panel hid the first surface of described apparatus body; When described panel was in the second place with respect to described apparatus body, the first surface of described apparatus body appeared by described opening.
4. according to claim 2 or 3 described electronic equipments, it is characterized in that, described over cap is plastic protection cover, corium over cap or PU over cap.
5. according to claim 2 or 3 described electronic equipments, it is characterized in that, described hall device is arranged at the inside of described apparatus body, and is positioned at the upper right quarter of described apparatus body.
6. electronic equipment according to claim 1 is characterized in that, described electronic equipment is mobile phone, panel computer, notebook computer or video player.
7. electronic equipment according to claim 6 is characterized in that, described electronic equipment is mobile phone, panel computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220594805 CN202916762U (en) | 2012-11-12 | 2012-11-12 | Electronic equipment provided with Hall device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220594805 CN202916762U (en) | 2012-11-12 | 2012-11-12 | Electronic equipment provided with Hall device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202916762U true CN202916762U (en) | 2013-05-01 |
Family
ID=48165059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220594805 Expired - Lifetime CN202916762U (en) | 2012-11-12 | 2012-11-12 | Electronic equipment provided with Hall device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202916762U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103941977A (en) * | 2014-03-28 | 2014-07-23 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104049718A (en) * | 2014-06-23 | 2014-09-17 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN104127010A (en) * | 2014-06-27 | 2014-11-05 | 小米科技有限责任公司 | Protective sleeve and equipment with protective sleeve |
| CN104239773A (en) * | 2014-09-18 | 2014-12-24 | 周长智 | Screen locking/unlocking device of mobile intelligent terminal and use method |
| CN104820469A (en) * | 2015-04-28 | 2015-08-05 | 广东欧珀移动通信有限公司 | Electronic equipment and enclosure identification method |
| CN104932622A (en) * | 2015-06-30 | 2015-09-23 | 青岛海信移动通信技术股份有限公司 | Mobile terminal protective sleeve and mobile terminal system |
| CN105737863A (en) * | 2016-02-25 | 2016-07-06 | 北京小米移动软件有限公司 | Hall sensor, terminal, and terminal operation method |
| CN105996377A (en) * | 2016-05-16 | 2016-10-12 | 慈溪市鑫睿电子科技有限公司 | Intelligent disinfection writing case |
| CN107148601A (en) * | 2014-09-11 | 2017-09-08 | 三星电子株式会社 | Electronic equipment and its control method |
| US9857835B2 (en) | 2014-06-27 | 2018-01-02 | Xiaomi Inc. | Protective cover and device having the protective cover |
| CN112099578A (en) * | 2020-09-03 | 2020-12-18 | 山东同其信息科技有限公司 | Big data digital information safety device based on Internet of things |
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- 2012-11-12 CN CN 201220594805 patent/CN202916762U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103941977A (en) * | 2014-03-28 | 2014-07-23 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104049718B (en) * | 2014-06-23 | 2017-01-04 | 联想(北京)有限公司 | A kind of information processing method and electronic equipment |
| CN104049718A (en) * | 2014-06-23 | 2014-09-17 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN104127010A (en) * | 2014-06-27 | 2014-11-05 | 小米科技有限责任公司 | Protective sleeve and equipment with protective sleeve |
| CN104127010B (en) * | 2014-06-27 | 2016-06-22 | 小米科技有限责任公司 | Protection set and the equipment with protection set |
| US9857835B2 (en) | 2014-06-27 | 2018-01-02 | Xiaomi Inc. | Protective cover and device having the protective cover |
| CN107148601A (en) * | 2014-09-11 | 2017-09-08 | 三星电子株式会社 | Electronic equipment and its control method |
| CN104239773A (en) * | 2014-09-18 | 2014-12-24 | 周长智 | Screen locking/unlocking device of mobile intelligent terminal and use method |
| CN104239773B (en) * | 2014-09-18 | 2018-10-12 | 周长智 | Screen locking/the tripper and application method of mobile intelligent terminal |
| CN104820469B (en) * | 2015-04-28 | 2018-01-19 | 广东欧珀移动通信有限公司 | A kind of electronic equipment and the method for identifying shell |
| CN104820469A (en) * | 2015-04-28 | 2015-08-05 | 广东欧珀移动通信有限公司 | Electronic equipment and enclosure identification method |
| CN104932622A (en) * | 2015-06-30 | 2015-09-23 | 青岛海信移动通信技术股份有限公司 | Mobile terminal protective sleeve and mobile terminal system |
| CN105737863A (en) * | 2016-02-25 | 2016-07-06 | 北京小米移动软件有限公司 | Hall sensor, terminal, and terminal operation method |
| CN105737863B (en) * | 2016-02-25 | 2019-07-02 | 北京小米移动软件有限公司 | Hall sensor, terminal and terminal operation method |
| CN105996377A (en) * | 2016-05-16 | 2016-10-12 | 慈溪市鑫睿电子科技有限公司 | Intelligent disinfection writing case |
| CN112099578A (en) * | 2020-09-03 | 2020-12-18 | 山东同其信息科技有限公司 | Big data digital information safety device based on Internet of things |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20130501 |
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| CX01 | Expiry of patent term |