1. A piezoelectric actuator for driving a lens unit along an optical axis, comprising:
a fixed member;
a movable member movably received in the fixed member, the movable member comprising a contacting portion positioned thereon;
a magnetic plate fixed on the fixed member;
a magnet fixed on the movable, the magnet being aligned with the magnetic plate along a direction substantially perpendicular to the optical axis;
a piezoelectric member fixed on the fixed member and contacting on the contacting portion of the movable member, the piezoelectric be configured for driving the movable member to move along the optical axis; and
a circuit board configured for providing voltages to the piezoelectric member.
2. The piezoelectric actuator of claim 1, further comprising a bottom plate fixed on the fixed member for restricting the movable member in the fixed member.
3. The piezoelectric actuator of claim 2, wherein the fixed member further comprises a plurality of fixing holes in an end surface thereof facing toward the bottom plate, the bottom plate comprises a plurality of fixing poles spatially corresponding to the fixing holes, each fixed pole inserts into a corresponding fixing hole.
4. The piezoelectric actuator of claim 2, wherein the bottom plate defines a central opening therein for allowing light from the lens unit to pass therethrough.
5. The piezoelectric actuator of claim 2, further comprising a guiding member for guiding the movable member to move along the optical axis, the guiding member slidably passing through the movable member, and two opposite ends of the guiding member being respectively fixed on the fixed member and the bottom plate.
6. The piezoelectric actuator of claim 5, wherein the movable member comprises a yoke portion positioned on a corner thereof, and the guiding member is slidably mounted on the yoke portion.
7. The piezoelectric actuator of claim 1, wherein the fixed member defines a mounting opening in a sidewall thereof, the piezoelectric member is fixedly received in the mounting opening.
8. The piezoelectric actuator of claim 7, wherein the fixed member defines a first groove in the sidewall near the mounting opening, the magnetic plate is fixedly received in the first groove.
9. The piezoelectric actuator of claim 1, wherein the fixed member defines a first receiving space through two opposite ends thereof along the optical axis, the movable member is movably received in the first receiving space.
10. The piezoelectric actuator of claim 1, wherein the movable member defines a second groove in a sidewall thereof, the magnet is fixedly received in the second groove.
11. The piezoelectric actuator of claim 10, wherein the movable member defines a receiving portion in the sidewall, the contacting portion is fixed in the receiving portion.
12. The piezoelectric actuator of claim 1, wherein the contacting portion is integrally formed with the movable member.
13. The piezoelectric actuator of claim 1, further comprising a restricting sheet for restricting the piezoelectric member and the magnetic plate on the fixed member, the restricting member being fixed on a sidewall of the fixed member with the piezoelectric member and the magnetic plate fixed on.
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 method for manufacture of titanium alloy for use in a high temperature and high stress environment, comprising:
providing a titanium alloy consisting essentially of, in weight %, 0.2 to 0.5 iron, 0.02 to 0.12 oxygen, 0.15 to 0.6 silicon and balance titanium and incidental impurities; followed by
performing a first heat treatment of said titanium alloy at a first temperature that is above the temperature where a precipitate phase begins to dissolve and below a temperature where the titanium alloy has a structure that is greater than 50% of a beta phase; followed by
cold rolling said titanium alloy to a desired thickness; followed by
performing a second heat treatment of said titanium alloy at a second temperature that allows precipitation of second phase particles in the titanium alloy; and followed by
performing a third heat treatment of said titanium alloy at a third temperature to recrystallize the titanium alloy without dissolving precipitate particles.
2. The method of claim 1, wherein said first temperature is selected wherein recrystallization and softening of said titanium alloy is optimized without substantial coarsening of second phase particles.
3. The method of claim 1, wherein said first temperature is approximately 1500-1600\xb0 F.
4. The method of claim 1, wherein said rolling of said titanium alloy reduces the thickness of said titanium alloy by at least 65%.
5. The method of claim 1, wherein said second temperature is approximately 900-1100\xb0 F.
6. The method of claim 1, wherein said third temperature is approximately 1200-1600\xb0 F.
7. The method of claim 1, wherein any of said first, second or third heat treatments are performed in an air atmosphere or an inert gas atmosphere.
8. The method of claim 1, further comprising imparting a controlled strain unto said titanium alloy.
9. The method of claim 8, wherein said imparting of a controlled strain unto said titanium alloy involves temper rolling or tension leveling said titanium alloy.
10. A method for manufacture of titanium alloy for use in a high temperature and high stress environment, comprising:
providing a titanium alloy consisting essentially of, in weight %, 0.2 to 0.5 iron, 0.02 to 0.12 oxygen, 0.15 to 0.6 silicon and balance titanium and incidental impurities;
performing a first heat treatment of said titanium alloy at a first temperature that is above the temperature where a precipitate phase begins to dissolve and below a temperature where the titanium alloy has a structure that is greater than 50% of a beta phase; followed by
cold rolling said titanium alloy to a desired thickness; followed by
performing a second heat treatment of said titanium alloy at said first temperature for a first time wherein a grain size between that of ASTM 3 and ASTM 6grade titanium alloys is achieved; and followed by
performing a third heat treatment of said titanium alloy at a second temperature to precipitate silicides to prevent grain growth during use.
11. The method of claim 10, wherein said first temperature is selected wherein recrystallization and softening of said titanium alloy is optimized without substantial coarsening of second phase particles.
12. The method of claim 10, wherein said first temperature is approximately 1500-1600\xb0 F.
13. The method of claim 10, wherein said rolling of said titanium alloy reduces the thickness of said titanium alloy by at least than 65%.
14. The method of claim 10, wherein said first time is approximately 5 minutes to 1 hour.
15. The method of claim 10, wherein said second temperature is approximately 900-1100\xb0 F.
16. The method of claim 10, wherein any of said first, second or third heat treatments are performed in an air atmosphere or an inert gas atmosphere.
17. The method of claim 10, further comprising imparting a controlled strain unto said titanium alloy.
18. The method of claim 17, wherein said imparting of a controlled strain unto said titanium alloy involves temper rolling or tension leveling said titanium alloy.
19. A method for manufacture of titanium alloy for use in a high temperature and high stress environment, comprising:
performing a first heat treatment of said titanium alloy at a first temperature that is below a temperature where the titanium alloy has a structure that is greater than 50% of a beta phase; followed by
cold rolling said titanium alloy to a desired thickness; followed by
performing a second heat treatment of said titanium alloy at a second temperature that allows precipitation of second phase particles in the titanium alloy; and followed by
performing a third heat treatment of said titanium alloy at a third temperature to recrystallize the titanium alloy without dissolving the precipitate.
20. A method for manufacture of titanium alloy for use in a high temperature and high stress environment, comprising:
performing a first heat treatment of said titanium alloy at a first temperature that is below a temperature where the titanium alloy has a structure that is greater than 50% of a beta phase; followed by
cold rolling said titanium alloy to a desired thickness; followed by
performing a second heat treatment of said titanium alloy at said first temperature for a first time wherein a grain size between that of ASTM 3 and ASTM 6 grade
titanium alloys is achieved; and followed by
performing a third heat treatment of said titanium alloy at a second temperature to precipitate silicides to prevent grain growth during use.