Method of manufacturing piezoelectric actuator and method of joining lead wire to piezoelectric element of piezoelectric actuator

• US 6,464,130 B1
• Filed: 06/19/2000
• Issued: 10/15/2002
• Est. Priority Date: 03/16/1999
• Status: Expired due to Fees

• Current Assignee: Seiko Instruments Incorporated (Seiko Group)
• Original Assignee: Seiko Instruments Incorporated (Seiko Group)
• Inventors: Yoshida, Tomoyuki, Koroishi, Keitaro, Itoh, Hironobu
• Primary Examiner(s): Dunn, Tom
• Assistant Examiner(s): EDMONDSON, LYNNE RENEE
• Application Number:
  US09/596,943
• Time in Patent Office: 848 Days
• Field of Search: 29/253.5, 298/40, 228/245, 228/246, 228/256, 228/33-41, 310/358, 310/359, 310/366
• US Class Current: 228/245
• CPC Class Codes: H02N 2/0085 Leads; Wiring arrangements
• CPC Class Codes: H02N 2/166 Motors with disc stator
• CPC Class Codes: H10N 30/06 Forming electrodes or interconnections, e.g. leads or terminals

Abstract

A method is provided for manufacturing a piezoelectric actuator having a piezoelectric element and a lead wire for supplying a drive signal to the piezoelectric element. A melt material is immersed into a fusing agent. A quantity of the material and the fusing agent is supplied to a transfer plate and then adjusted. A preselected quantity of the melt material and the fusing agent is then transferred preselected quantity of the melt material and the fusing agent is supplied from the transfer tool to the lead wire. The melt material is then welded on the lead wire and on the piezoelectric element to thereby connect the lead wire to the piezoelectric element.

Claims

1. A method of manufacturing a piezoelectric actuator, comprising steps of:

providing a piezoelectric element and a lead wire for supplying a drive signal to the piezoelectric element;

immersing a melt material into a fusing agent;

supplying a quantity of the melt material and the fusing agent to a transfer plate;

adjusting the quantity of the melt material and the fusing agent on the transfer plate;

transferring a preselected quantity of the melt material and the fusing agent from the transfer plate to a transfer tool;

supplying the preselected quantity of the melt material and the fusing agent from the transfer tool to the lead wire;

welding the melt material on the lead wire; and

welding the melt material on the piezoelectric element to thereby connect the lead wire to the piezoelectric element.

3. A method of manufacturing a piezoelectric actuator according to claim 1;

wherein the melt material is generally spherical-shaped.

4. A method of manufacturing a piezoelectric it actuator according to claim 3;

wherein the adjusting step is carried out using a squeegee.

5. A method of manufacturing a piezoelectric actuator according to claim 1;

wherein the adjusting step is carried out using a squeegee.

6. A method of manufacturing a piezoelectric actuator according to claim 1;

wherein the adjusting step is carried out by moving a squeegee across a portion of the transfer plate on which the melt material and the fusing agent is supplied.

7. A method of manufacturing a piezoelectric actuator according to claim 1;

wherein the transfer tool has a portion on which the preselected quantity of the melt material and the fusing agent is supplied; and

wherein the transfer plate has a recess formed in a surface thereof into which the quantity of the melt material and the fusing agent is supplied and from which the preselected quantity of melt material and fusing agent transferred to the portion of the transfer tool is obtained.

8. A method of manufacturing a piezoelectric actuator according to claim 7;

wherein the preselected quantity of the melt material and the fusing agent is determined by a size of the portion of the tool and a depth of the recess in the surface of the transfer plate.

9. A method of manufacturing a piezoelectric actuator according to claim 7;

wherein the adjusting step is carried out by moving a squeegee across the recess in the surface of the transfer plate.

2. A method of manufacturing a piezoelectric actuator, comprising steps of:

providing a piezoelectric element and a lead wire for supplying a drive signal to the piezoelectric element;

immersing a melt material into a fusing agent;

supplying the melt material and the fusing agent to a transfer plate;

transferring the melt material and the fusing agent from the transfer plate to a transfer tool;

supplying the melt material and the fusing agent from the transfer tool to the lead wire; and

welding the melt material on the lead wire and the piezoelectric element using a heating device to thereby connect the lead wire to the piezoelectric element.

10. In a method of manufacturing a piezoelectric actuator having a piezoelectric element having an electrode pattern, and a lead wire for supplying a drive signal to the piezoelectric element, a method of joining the lead wire to the electrode pattern of the piezoelectric element, comprising the steps of:

immersing a melt material into a fusing agent;

supplying a quantity of the melt material and the fusing agent to a transfer plate;

transferring the melt material and the fusing agent from the transfer plate to a transfer tool;

supplying the melt material and the fusing agent from the transfer tool to the lead wire; and

welding the melt material on the lead wire and on the electrode pattern of the piezoelectric element to thereby join the lead wire to the electrode pattern.

11. A method according to claim 10;

wherein the melt material is generally spherical-shaped.

12. A method according to claim 11;

wherein the step of supplying the quantity of the melt material and the fusing agent to the transfer plate includes the step of adjusting the quantity of the melt material and the fusing agent on the transfer plate.

13. A method according to claim 12;

wherein the adjusting step is carried out using a squeegee.

14. A method according to claim 10;

wherein the step of supplying the quantity of the melt material and the fusing agent to the transfer plate includes the step of adjusting the quantity of the melt material and the fusing agent on the transfer plate.

15. A method according to claim 14;

wherein the adjusting step is carried out using a squeegee.

16. A method according to claim 10;

wherein the welding step comprises bringing the lead wire and the electrode pattern close to one another and applying heat using a heating device to weld the melt material on the lead wire and the electrode pattern.

17. A method of manufacturing a piezoelectric actuator, comprising the steps of:

providing a support member having a support shaft;

providing an oscillating body having a resilient member, a piezoelectric element mounted on the resilient member, and an electrode pattern disposed on the piezoelectric element;

connecting to the support member a lead wire for supplying a drive signal to the piezoelectric element;

press-fitting the support shaft of the support member in a through-hole formed in the resilient member of the oscillating body;

immersing a melt material into a fusing agent;

supplying a quantity of the melt material and the fusing agent to a transfer plate;

transferring the melt material and the fusing agent from the transfer plate to a transfer tool;

supplying the melt material and the fusing agent from the transfer tool to the lead wire; and

welding the melt material on the lead wire and on the electrode pattern of the piezoelectric element to thereby join the lead wire to the piezoelectric element.

18. A method according to claim 17;

wherein the melt material is generally spherical-shaped.

19. A method according to claim 18;

wherein the step of supplying the quantity of the melt material and the fusing agent to the transfer plate includes the step of adjusting the quantity of the melt material and the fusing agent on the transfer plate.

20. A method according to claim 19;

wherein the adjusting step is carried out using a squeegee.

21. A method according to claim 17;

wherein the step of supplying the quantity of the melt material and the fusing agent to the transfer plate includes the step of adjusting the quantity of the melt material and the fusing agent on the transfer plate.

22. A method according to claim 21;

wherein the adjusting step is carried out using a squeegee.

23. A method according to claim 17;

wherein the welding step comprises bringing the lead wire and the electrode pattern close to one another and applying heat using a heating device to weld the melt material on the lead wire and the electrode pattern.