1. A piezoelectricelectrostrictive device comprising:
a ceramic substrate;
at least one piezoelectricelectrostrictive layer comprising a piezoelectricelectrostrictive ceramic composition and being formed on said ceramic substrate; and
at least one pair of electrodes electrically connected to said piezoelectricelectrostrictive layer;
wherein said piezoelectricelectrostrictive ceramic composition contains a major component comprising a PbMg13Nb23O3\u2014PbZrO3\u2014PbTiO3 system composition, wherein part of the Pb is substituted with at least one of Sr and La, and contains Ce in an amount of 0.01 to 0.50% by mass in terms of CeO2; and
wherein said piezoelectricelectrostrictive layer is solidly attached to said substrate directly or via part of said electrodes.
2. The piezoelectricelectrostrictive device according to claim 1, wherein part of Pb is substituted with Sr and La in said piezoelectricelectrostrictive ceramic composition.
3. The piezoelectricelectrostrictive device according to claim 2, wherein said PbMg13Nb23O3\u2014PbZrO3\u2014PbTiO3 system composition is represented by the following compositional formula (1):
(Pb,Sr,La)x(Mg13Nb23)aTibZrcO3\u2003\u2003(1);
wherein x is 0.90\u2266x\u22661.10; a, b and c are decimal fractions falling, in coordinates formed by three coordinate axes of a, b and c, in a range of (a,b,c)=(0.550, 0.425, 0.025), (0.550, 0.325, 0.125), (0.375, 0.325, 0.300), (0.100, 0.425, 0.475), (0.100, 0.475, 0.425) and (0.375, 0.425, 0.200); and a+b+c=1.00.
4. The piezoelectricelectrostrictive device according to claim 3, wherein x is in a range of 0.95\u2266x\u22660.98 or 1.02\u2266x\u22661.05.
5. The piezoelectricelectrostrictive device according to claim 4, wherein a ratio of the amount of Pb that is substituted with Sr is in a range of 3.0 to 10.0 mole %.
6. The piezoelectricelectrostrictive device according to claim 5, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
7. The piezoelectricelectrostrictive device according to claim 4, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
8. The piezoelectricelectrostrictive device according to claim 3, wherein a ratio of the amount of Pb that is substituted with Sr is in range of 3.0 to 10.0 mole %.
9. The piezoelectricelectrostrictive device according to claim 8, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
10. The piezoelectricelectrostrictive device according to claim 3, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
11. The piezoelectricelectrostrictive device according to claim 2, wherein a ratio of the amount of Pb that is substituted with Sr is in a range of 3.0 to 1.0 mole %.
12. The piezoelectricelectrostrictive device according to claim 11, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
13. The piezoelectricelectrostrictive device according to claim 2, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
14. The piezoelectricelectrostrictive device according to claim 1, wherein a ratio of the amount of Pb that is substituted with Sr is in a range of 3.0 to 10.0 mole %.
15. The piezoelectricelectrostrictive device according to claim 14, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
16. The piezoelectricelectrostrictive device according to claim 1, wherein a ratio of the amount of Pb that is substituted with La is in a range of 0.3 to 1.0 mole %.
17. The piezoelectricelectrostrictive device according to claim 1, wherein a plurality of said piezoelectricelectrostrictive layers and a plurality of said electrode pairs are provided, and wherein said plurality of piezoelectricelectrostrictive layers are alternately laminated via a negative electrode or a positive electrode of said plurality of electrode pairs.
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. An apparatus for managing content data in an information terminal, the apparatus comprising:
a data storage unit for storing the content data;
a content information database (DB) for storing content data information corresponding to the content data; and
a content manager for receiving a request message for specific content data information from an application of the information terminal, and for providing content-information-DB index information of the content data information in response to the request message.
2. The apparatus as claimed in claim 1, wherein the content data information is stored according to categories, the categories being set according to applications or services.
3. The apparatus as claimed in claim 1, wherein the content data information is stored according to categories, the categories being set according to data format information.
4. The apparatus as claimed in claim 1, wherein the content data information is stored according to categories, the categories being set regardless of data storage location information.
5. The apparatus as claimed in claim 2, wherein the request message includes information relating to the category.
6. The apparatus as claimed in claim 3, wherein the request message includes information relating to the category.
7. The apparatus as claim in claim 4, wherein the request message includes information relating to the category.
8. The apparatus as claimed in claim 2, wherein the content-information-DB index information includes a specific index of a category including content data information corresponding to the request message and a specific index of the content data information.
9. The apparatus as claimed in claim 3, wherein the content-information-DB index information includes a specific index of a category including content data information corresponding to the request message and a specific index of the data information.
10. The apparatus as claimed in claim 4, wherein the content-information-DB index information includes a specific index of a category including content data information corresponding to the request message and a specific index of the data information.
11. A method for managing content data in an information terminal, the method comprising the steps of:
storing content data information of the content data in a content information database DB in the information terminal;
receiving a request message for specific content data of the content data from an application of the information terminal;
searching the content information DB for specific content data information according to the request message; and
providing specific content-information-DB index information of the searched content data information in response to the request message.
12. The method as claimed in claim 11, wherein, in the content data information storage step, the content data information is stored according to categories, the categories being set according to applications or to services.
13. The method as claimed in claim 11, wherein, in the content data information storage step, the content data information is stored according to categories, the categories being set according to data format information of content data corresponding to the content data information.
14. The method as claimed in claim 11, wherein, in the content data information storage step, the content data information is stored according to categories, the categories being set regardless of data storage location information.
15. The method as claimed in claim 12, wherein the request message includes the category of the specific content data information.
16. The method as claimed in claim 13, wherein the request message includes the category of the specific content data information.
17. The method as claimed in claim 14, wherein the request message includes the category of the specific content data information.
18. The method as claimed in claim 11, wherein the search step comprises the steps of:
searching the content information DB for a category corresponding to category information included in the request message; and
selecting specific content data information included in the searched category.
19. The method as claimed in claim 12, wherein the content-information-DB index information includes specific index information of the category including the content data information according to the request message and specific index information of the content data information.
20. The method as claimed in claim 13, wherein the content-information-DB index information includes specific index information of the category including the content data information according to the request message and specific index information of the content data information.
21. The method as claimed in claim 14, wherein the content-information-DB index information includes specific index information of the category including the content data information according to the request message and specific index information of the content data information.
22. The method of claim 12, wherein the search step further comprises a step of selecting a specific category when a user wants to move content data information of specific content data into the specific category.
23. The method of claim 13, wherein the search step further comprises a step of selecting a specific category when a user wants to move content data information of specific content data into the specific category.
24. The method of claim 14, wherein the search step further comprises a step of selecting a specific category when a user wants to move content data information of specific content data into the specific category.
25. The method as claimed in claim 22, wherein the category selection step comprises:
reading content data information of content data selected by the user;
displaying categories of the content information DB;
selecting one of the displayed categories by the user; and
inputting the read content data information into a category selected by the user.
26. The method as claimed in claim 25, wherein the category selection step further comprises the steps of:
checking whether the user selects creation of a new user category; and
creating the user category.
27. The method as claimed in claim 26, wherein the user category creation step comprises the steps of:
receiving category information of the user category from the user; and
creating the user category according to the received category information and storing the created user category in the content information DB.
28. The method as claimed in claim 11, further comprising when the user selects a category, displaying a list of content data stored in the selected category so as to enable the user to select one of the displayed content data, and providing index information of content data selected by the user.
29. The method as claimed in claim 28, wherein the list of content data has one of a thumbnail, an icon and a list item, which is corresponding to the content data.
30. The method as claimed in claim 29, wherein the list of a content data has one of a thumbnail, an icon and a list item, which is corresponding to the content data which can be selected by the user.
31. The method of claim 13, wherein the content data information storage step further comprises a step in which the content data information, which is classified and stored according to the categories, is further classified according to categories which are subdivided according to applications or services.
32. The method of claim 14, wherein the content data information storage step further comprises a step in which the content data information, which is classified and stored according to the categories, is further classified according to categories which are subdivided according to applications or services.