1. A data synchronization method comprising:
acquiring, in a partial-data synchronization process, a first part of a data item which is to be sent to a data synchronization client;
acquiring a data link with which the whole data item or a second part of the data item is retrievable;
sending the first part of the data item and the data link to the client.
2. The method of claim 1, wherein the acquiring a data link with which the whole data item or a second part of the data item is retrievable comprises: acquiring the data link based on information which is set in a data synchronization server and indicates that the data link of the whole data item or a second part is to be acquired when partial-data synchronization is performed; or,
acquiring the data link based on a request for data link with which the whole data item or a second part of the data item is retrievable sent by the data synchronization client when partial-data synchronization is performed.
3. The method of claim 1, wherein the acquiring the data link comprises:
acquiring the information of the location of the whole data item or a second part of the data item in the data item and generating the data link based on the information of the location of data item; or,
acquiring the information of the unique identifier of the whole data item or a second part of the data item in the data item and generating the data link based on the information of the unique identifier of data item.
4. The method of claim 1, wherein the method further comprises:
performing, after performing data synchronization with one of the multiple data synchronization clients, data synchronization with the other data synchronization clients based on the setting information that the associated synchronization is to be performed for multiple data synchronization clients.
5. The method of claim 1, further comprising:
receiving, a request for acquiring the whole data item or a second part of the data item, wherein the request includes the data link;
sending the whole data item or the second part of the data item according to the request.
6. The method of claim 1, further comprising:
receiving a specific service including the data link;
acquiring the whole data item or a second part of the data item based on the data link in the specific service;
setting the acquired the whole data item or second part of the data item in the specific service and then processing the specific service.
7. The method of claim 6, before acquiring the whole data item or a second part of the data item of the data item, further comprising:
determining whether the contents of the specific service is needed based on the policy of the operator, user subscription information and user setting, performing the step of requesting the equipment storing the corresponding data item for acquiring the whole data item or a second part of the data item.
8. The method of claim 7, wherein the specific service comprises: a short message, multimedia message, converged IP message or email;
the processing, by the equipment on the network side, the specific service comprises: sending, by the equipment on the network side, the short message, multimedia message, converged IP message or email.
9. The method of claim 1, wherein the first part of the data item is the information of the attribute or field of data in the data item,
and the second part of the data item is the information of the field or attribute of the data in the data item.
10. A data synchronization server comprising: a communication module and a synchronization service processing module, wherein
the communication module is adapted to acquire a first part of data item sent to a data synchronization client, and send the received first part of the data item and a data link to the data synchronization client;
the synchronization service processing module is adapted to acquire a data link with which the whole data item or a second part of the data item is retrievable, and provide the data link to the communication module.
11. The data synchronization server of claim 10, wherein the communication module is further adapted to acquire the whole data item or the second part of the data item according to a request for acquiring the whole data item or a second part of the data item which includes the data link.
12. The data synchronization server of claim 10, wherein the synchronization service processing module is further adapted to interact, based on setting information that associated synchronization is to be performed for multiple data synchronization clients and the information for which the synchronization service processing module performs data synchronization with one of the multiple data synchronization clients, with the other data synchronization clients of the multiple data synchronization clients through the communication module to perform data synchronization.
13. The data synchronization server of claim 10, wherein the synchronization service processing module is further adapted to acquire location information or a unique identifier of data in the data item, and generate the data link based on the information of the location or unique identifier, or provide the location information or the unique identifier to the data link generating device and receive the data link of the whole data item or a second part of the data item sent by the data link generating device.
14. The data synchronization server of claim 10, further comprising: a data link generating device, wherein
the data link generating device is adapted to generate the data link of the whole data item or a second part of the data item based on the information of the location or unique identifier of data in the data item.
15. A client device comprising: a communication module and a synchronization service processing module, wherein
the communication module is adapted to receive a first part of a data item and a data link with which the whole data item or a second part of the data item is retrievable sent by a data synchronization server;
the synchronization service processing module is adapted to store the data link and first part of the data item received by the communication module.
16. The client device of claim 15, further comprising: a service processing module, wherein
the service processing module is adapted to set the data link in a specific service and sending the specific service.
17. The client device of claim 15, further comprising a second communication module, wherein
the second communication module is adapted to acquire the whole data item or the second part of the data item corresponding to the data link from the data synchronization server.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A zoom lens system comprising, in order from an object side:
a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power;
a third lens unit having a positive refractive power; and
a fourth lens unit having a positive refractive power,
during zooming from a wide-angle end to a telephoto end, at least the first lens unit and the third lens unit being moved toward the object side so as to increase a space between the first lens unit and the second lens unit and decrease a space between the second lens unit and the third lens unit,
the following conditions being satisfied:
35\xb0<tan\u22121(Ifw)\u2003\u2003(1);
5<(ftfw)\u2003\u2003(2);
0.5<fg1ft<1.35\u2003\u2003(3);
0.4<|fg2fg3|<1\u2003\u2003(4); and
0.5<(M2gtM2gw)(M3gtM3gw)<1.3\u2003\u2003(5),
in which fw is a focal length of the zoom lens system in the wide-angle end,
ft is a focal length of the zoom lens system in the telephoto end,
I is a maximum image height of a formed image,
fg1 is a focal length of the first lens unit,
fg2 is a focal length of the second lens unit,
fg3 is a focal length of the third lens unit,
M2gw is a lateral magnification of the second lens unit in the wide-angle end,
M2gt is a lateral magnification of the second lens unit in the telephoto end,
M3gw is a lateral magnification of the third lens unit in the wide-angle end, and
M3gt is a lateral magnification of the third lens unit in the telephoto end.
2. The zoom lens system according to claim 1, wherein the following condition is satisfied:
0.5<Cjtft<1.8\u2003\u2003(6),
in which Cjt is a distance from an incidence surface of the zoom lens system to an image position in the telephoto end along the optical axis.
3. The zoom lens system according to claim 2, wherein the first lens unit comprises, in order from the object side, a negative lens and a positive lens in which a curvature of the object-side surface is larger than that of the image-side surface, and
the total number of the lenses of the first lens unit is two.
4. The zoom lens system according to claim 3, wherein the following condition is satisfied:
\u22121.5<(Rplf+Rplr)(Rplf\u2212Rplr)<\u22120.75\u2003\u2003(7),
in which Rplf is a radius of curvature of an object-side surface of the positive lens of the first lens unit, and
Rplr is a radius of curvature of an image-side surface of the positive lens of the first lens unit.
5. The zoom lens system according to claim 4, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
6. The zoom lens system according to claim 3, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
7. The zoom lens system according to claim 2, wherein the first lens unit comprises a positive lens which satisfies the following condition:
\u22121.5<(Rplf+Rplr)(Rplf\u2212Rplr)<\u22120.75\u2003\u2003(7),
in which Rplf is a radius of curvature of an object-side surface of the positive lens of the first lens unit, and
Rplr is a radius of curvature of an image-side surface of the positive lens of the first lens unit.
8. The zoom lens system according to claim 7, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
9. The zoom lens system according to claim 2, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
10. The zoom lens system according to claim 1, wherein the first lens unit comprises, in order from the object side, a negative lens and a positive lens in which a curvature of the object-side surface is larger than that of the image-side surface, and
the total number of the lenses of the first lens unit is two.
11. The zoom lens system according to claim 10, wherein the following condition is satisfied:
\u22121.5<(Rplf+Rplr)(Rplf\u2212Rplr)<\u22120.75\u2003\u2003(7),
in which Rplf is a radius of curvature of an object-side surface of the positive lens of the first lens unit, and
Rplr is a radius of curvature of an image-side surface of the positive lens of the first lens unit.
12. The zoom lens system according to claim 11, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
13. The zoom lens system according to claim 10, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
14. The zoom lens system according to claim 1, wherein the first lens unit comprises a positive lens which satisfies the following condition:
\u22121.5<(Rplf+Rplr)(Rplf\u2212Rplr)<\u22120.75\u2003\u2003(7),
in which Rplf is a radius of curvature of the object-side surface of the positive lens of the first lens unit, and
Rplr is a radius of curvature of the image-side surface of the positive lens of the first lens unit.
15. The zoom lens system according to claim 14, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
16. The zoom lens system according to claim 1, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
17. An image pickup apparatus comprising:
the zoom lens system according to claim 1; and
an image pickup device which is disposed on an image side of the zoom lens system and which converts an optical image into an electric signal.
18. The image pickup apparatus according to claim 17, further comprising:
a low pass filter arranged between the zoom lens system and the image pickup device.
19. A zoom lens system comprising, in order from an object side:
a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power;
a third lens unit having a positive refractive power; and
a fourth lens unit having a positive refractive power,
during zooming from a wide-angle end to a telephoto end, at least the first lens unit and the third lens unit being moved toward the object side so as to increase a space between the first lens unit and the second lens unit and decrease a space between the second lens unit and the third lens unit,
the first lens unit comprising, in order from the object side, a negative lens and a positive lens in which a curvature of the object-side surface is larger than that of an image-side surface,
the total number of the lenses of the first lens unit being two,
the following conditions being satisfied:
35\xb0<tan\u22121(Ifw)\u2003\u2003(1);
5<(ftfw)\u2003\u2003(2);
0.5<fg1ft<1.35\u2003\u2003(3); and
\u22121.5<(Rplf+Rplr)(Rplf\u2212Rplr)<\u22120.75\u2003\u2003(7),
in which fw is a focal length of the zoom lens system in the wide-angle end,
ft is a focal length of the whole zoom lens system in the telephoto end,
I is a maximum image height of a formed image,
fg1 is a focal length of the first lens unit,
Rplf is a radius of curvature of an object-side surface of the positive lens of the first lens unit, and
Rplr is a radius of curvature of an image-side surface of the positive lens of the first lens unit.
20. The zoom lens system according to claim 19, wherein the following conditions are satisfied:
0.4<|fg2fg3|<1\u2003\u2003(4); and
0.5<(M2gtM2gw)(M3gtM3gw)<1.3\u2003\u2003(5),
in which fg2 is a focal length of the second lens unit,
fg3 is a focal length of the third lens unit,
M2gw is a lateral magnification of the second lens unit in the wide-angle end,
M2gt is a lateral magnification of the second lens unit in the telephoto end,
M3gw is a lateral magnification of the third lens unit in the wide-angle end, and
M3gt is a lateral magnification of the third lens unit in the telephoto end.
21. The zoom lens system according to claim 20, wherein the following condition is satisfied:
0.5<Cjtft<1.8\u2003\u2003(6),
in which Cjt is a distance from an incidence surface of the zoom lens system to an image position in the telephoto end along the optical axis.
22. The zoom lens system according to claim 21, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
23. The zoom lens system according to claim 20, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
24. The zoom lens system according to claim 19, wherein the following condition is satisfied:
0.5<Cjtft<1.8\u2003\u2003(6),
in which Cjt is a distance from an incidence surface of the zoom lens system to an image position in the telephoto end along the optical axis.
25. The zoom lens system according to claim 19, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.
26. The zoom lens system according to claim 24, wherein the second lens unit comprises, in order from the object side, a negative lens, a positive lens and a negative lens,
the total number of the lenses of the second lens unit is three, and
the negative lens of the second lens unit closest to the object side comprises at least one aspherical surface.