1. A method of manufacturing a liquid ejection head which ejects liquid droplets from nozzle orifices by generating pressure fluctuation in liquid contained in a plurality of pressure generating chambers communicated with the nozzle orifices, the method comprising steps of:
providing a metallic plate member;
providing a first die, in which a plurality of projections are arrayed in a first direction with a fixed pitch, each of the projections being elongated in a second direction perpendicular to the first direction, the first die facing a first face of the plate member;
providing a second die, opposed to the first die while supporting a second face of the plate member;
providing at least one dam member in at least one of the first die and the second die, so as to project from one of the first die and the second die toward the other one of the first die and the second die;
approaching the first die and the second die, so that the at least one dam member is dug into at least one of the first face and the second face of the plate member; and
further approaching the first die and the second die, so that the projections are dug into a first region in the first face of the plate member, the projections being pressed in a third direction orthogonal to the first direction and the second direction, so as to generate a plastic flow of a material in the plate member into gaps defined between the projections, thereby forming partitioned recesses to be the pressure generating chambers,
wherein the at least one dam member is situated in the vicinity of at least one of ends in the first direction of the first region, thereby suppressing a plastic flow of the material in the first direction caused by the dug projections.
2. The manufacturing method as set forth in claim 1, wherein the dam member is elongated in the second direction.
3. The manufacturing method as set forth in claim 1, wherein a tip end of the dam member is closer to the plate member than tip ends of the projections.
4. The manufacturing method as set forth in claim 1, wherein the at least one dam member is provided in each of the first die and the second die, such that the dam member in the first die and the dam member in the second die are opposed to each other.
5. The manufacturing method as set forth in claim 1, wherein the plate member includes at least one opening formed in at least one of the first face and the second face and configured to accept the dam member.
6. The manufacturing method as set forth in claim 5, wherein the opening is formed in each of the first face and the second face.
7. The manufacturing method as set forth in claim 6, wherein the opening formed in the first face is communicated with the opening formed in the second face.
8. The manufacturing method as set forth in claim 6, wherein each of the opening formed in the first face and the opening formed in the second face is a bottomed hole.
9. The manufacturing method as set forth in claim 8, wherein the dam member is dug into a bottom portion of the bottomed hole.
10. The manufacturing method as set forth in claim 1, further comprising a step of boring a through hole at a bottom of each of the partitioned recesses, the through hole being to be a passage communicating one of the pressure chambers and one of the nozzle orifice.
11. A liquid ejection head, comprising:
a metallic plate member, comprising:
a first face, having a first region formed with a plurality of recesses which are arrayed in a first direction, each of the recesses being elongated in a second direction perpendicular to the first direction; and
a second face, formed with a plurality of holes each of which is communicated with one of the recesses;
an elastic plate, joined to the first face of the plate member so as to seal the recesses to form the pressure generating chamber; and
a nozzle plate, joined to the second face of the plate member, the nozzle plate formed with a plurality of nozzle orifices from which the liquid droplets are ejected, each of the nozzle orifice being communicated with one of the holes,
wherein at least one opening elongated in the second direction is formed in at least one of the first face and the second face of the plate member so as to situate in the vicinity of at least one of ends in the first direction of the first region.
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 authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card; and
checking the password against the reference password in the card,
wherein the card and the user are authenticated if the password and the reference password match in the checking step.
2. An authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card using power supplied by communication between the card and a terminal;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card; and
checking the password against the reference password in the card,
wherein the card and the user are authenticated if the password and the reference password match in checking the step.
3. An authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card;
checking the password against the reference password in the card, and
transmitting authentication data of the user if the password and the reference password match in the checking step.
4. An authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card using power supplied by communication between the card and a terminal;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card;
checking the password against the reference password in the card, and
transmitting authentication data of the user to the terminal if the password and the reference password match in the checking step.
5. An authentication method in a communication system in which a server identifies with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card using power supplied by communication between the card and a terminal;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card;
checking the password against the reference password in the card; and
transmitting authentication data of the user to the terminal if the password and the reference password match in the checking step,
wherein after the authentication data of the user is received by the terminal, communication between the user and the server starts through the terminal.
6. An authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card; and
checking the password against the reference password in the card,
wherein the card does not transmit authentication data of the user if the password and the reference password do not match in the checking step.
7. An authentication method in a communication system for identifying with a card a user of the card, comprising:
storing a plurality of correspondence tables in the card, wherein one of the plurality of correspondence tables to be used can be changed;
storing in the card a reference password which is formed by converting biometrics of an authorized user using the one of the plurality of correspondence tables in the card;
reading with the card biometrics of the user of the card using power supplied by communication between the card and a terminal;
converting the biometrics of the user into a password using the one of the plurality of correspondence tables in the card; and
checking the password against the reference password in the card,
wherein the card does not transmit authentication data of the user to the terminal if the password and the reference password do not match in the checking step.
8. The authentication method according to any one of claims 1 to 7, wherein the step of reading biometrics of the user is conducted by a sensor provided in the card.
9. A communication system comprising:
a terminal;
a management server; and
an authentication card having a function of distinguishing a user,
wherein the authentication card comprises:
a sensor for reading biometrics of the user,
a function of storing a plurality of correspondence tables for converting the biometrics read by the sensor into a password, wherein one of the plurality of correspondence tables to be used can be changed,
a function of forming the password from the biometrics read by the sensor with reference to the one of the plurality of correspondence tables,
a function of storing a password which is formed from biometrics of an authorized user as a reference password by the function of forming the password,
a function of checking the password against the reference password, and
a function of wirelessly transmitting information to the terminal which is connected to the management server.
10. An authentication card which has a function of identifying a user, comprising:
a sensor for reading biometrics of the user,
a function of storing a plurality of correspondence tables for converting the biometrics read by the sensor into a password, wherein one of the plurality of correspondence tables to be used can be changed,
a function of forming the password from the biometrics read by the sensor with reference to the one of the plurality of correspondence tables,
a function of storing a password as a reference password which is formed from biometrics of an authorized user by the function of forming the password,
a function of checking the password against the reference password, and
a function of wirelessly transmitting information.
11. The communication system according to claim 9, wherein an authentication-complete signal is transmitted from the authentication card to the management server through the terminal if the password and the reference password match in the step of checking.
12. The communication system according to claim 9, wherein an authentication-incomplete signal is transmitted from the authentication card to the management server through the terminal if the password and the reference password do not match in the step of checking.
13. The method according to any one of claims 1 to 7, wherein information obtained from a hand is used as the biometrics.
14. The method according to any one of claims 1 to 7, wherein information obtained from a fingerprint is used as the biometrics.
15. The authentication card according to claim 10, wherein information can be transmitted wirelessly if the password and the reference password match in the step of checking.
16. The authentication card according to claim 10, wherein information cannot be transmitted wirelessly if the password and the reference password do not match in the step of checking.