Pengdi P Han

US Patent:

7908722, Mar 22, 2011

Filed:

Oct 15, 2008

Appl. No.:

12/252037

Inventors:

Pengdi Han - Bolingbrook IL, US

Assignee:

H.C. Materials Corporation - Bolingbrook IL

International Classification:

H01L 41/04
H02N 2/00

US Classification:

29 2535, 29846, 310333, 310360, 252 629 PZ

Abstract:

A process for the preparation of piezoelectric single crystal elements involving the steps of mechanically finishing of a single crystal element with cuttings such as zxt45, coating electrodes on a pair of Z surfaces, poling the single crystal in a direction along the axis under a 500V/mm electric field.

US Patent:

8535442, Sep 17, 2013

Filed:

Jul 12, 2007

Appl. No.:

12/373080

Inventors:

Pengdi Han - Bolingbrook IL, US
Jian Tian - Napierville IL, US

Assignee:

H.C. Materials Corporation - Bolingbrook IL

International Classification:

C30B 35/00
C30B 13/28
C30B 11/00
C30B 13/00
C30B 21/04
C30B 28/08

US Classification:

117223, 117200, 117202, 117206, 117219, 117220

Abstract:

This invention includes a system and a method for growing crystals including a batch auto-feeding mechanism. The proposed system and method provide a minimization of compositional segregation effect during crystal growth by controlling growth rate involving a high-temperature flow control system operable in an open and a closed loop crystal growth process. The ability to control the growth rate without corresponding loss of volatilize-able elements enables significantly improvement in compositional homogeneity and a consequent increase in crystal yield. This growth system and method can be operated in production scale, simultaneously for a plurality of growth crucibles to further the reduction of manufacturing costs, particularly for the crystal materials of binary or ternary systems with volatile components, such as Lead (Pb) and Indium (In).

US Patent:

8559273, Oct 15, 2013

Filed:

Oct 13, 2011

Appl. No.:

13/821425

Inventors:

Pengdi Han - Bolingbrook IL, US
Jian Tian - Bolingbrook IL, US
Kevin Meneou - Bolingbrook IL, US
Brandon Stone - Bolingbrook IL, US

Assignee:

H.C. Materials Corporation - Bolingbrook IL

International Classification:

G03B 42/06
H04R 17/00

US Classification:

367140

Abstract:

The present invention generally relates to high frequency piezoelectric crystal composites, devices, and method for manufacturing the same. In adaptive embodiments an improved imaging device, particularly a medical imaging device or a distance imaging device, for high frequency (>20 MHz) applications involving an imaging transducer assembly is coupled to a signal imagery processor. Additionally, the proposed invention presents a system for photolithography based micro-machined piezoelectric crystal composites and their uses resulting in improved performance parameters.

US Patent:

20030164137, Sep 4, 2003

Filed:

Nov 4, 2002

Appl. No.:

10/288042

Inventors:

Pengdi Han - Renton WA, US

Assignee:

H.C. Materials Corporation - Urbana IL

International Classification:

C30B009/00
C30B029/16

US Classification:

117/081000, 117/083000, 117/219000, 117/221000, 117/222000, 117/944000

Abstract:

This invention provides a hybrid Stockbarger zone-leveling melting method for seeded crystallization and the manufacture of homogenous large-sized crystals of lead magnesium niobate-lead titanate (PMN-PT) based solid solutions and related piezocrystals. The invention provides three temperature zones resulting in increased compositional homogeneity and speed of crystal growth, in a cost effective multi-crucible configuration.

US Patent:

20060012270, Jan 19, 2006

Filed:

Jul 14, 2005

Appl. No.:

11/182704

Inventors:

Pengdi Han - Urbana IL, US

International Classification:

H01L 41/187

US Classification:

310358000

Abstract:

Piezoelectric crystal elements are provided having preferred cut directions that optimize the shear mode piezoelectric properties. In the discovered cut directions, the crystal elements have super-high piezoelectric performance with d, dand dshear modes at room temperature. The dshear mode crystal gives a maximum d value and is free from the cross-talk of dand d. The dmode is extremely reliable compared to other shear elements due to its ready re-poling capability. The crystal elements may be beneficially used for high-sensitive acoustic transducers.

US Patent:

20070034141, Feb 15, 2007

Filed:

Aug 17, 2005

Appl. No.:

11/205875

Inventors:

Pengdi Han - Urbana IL, US

International Classification:

C30B 11/00
C30B 17/00
C30B 9/00
C30B 21/02
C30B 28/06

US Classification:

117081000, 117083000

Abstract:

This invention provides a hybrid Stockbarger zone-leveling melting method for seeded crystallization and the manufacture of homogenous large-sized crystals of lead magnesium niobate-lead titanate (PMN-PT) based solid solutions and related piezocrystals. The invention provides three temperature zones resulting in increased compositional homogeneity and speed of crystal growth, in a cost effective multi-crucible configuration.

US Patent:

20070290579, Dec 20, 2007

Filed:

Jun 15, 2007

Appl. No.:

11/818735

Inventors:

Pengdi Han - Bolingbrook IL, US

International Classification:

H01L 41/187
B05D 5/12
C04B 35/46

US Classification:

310358000, 2520629PZ, 427100000

Abstract:

Piezoelectric crystal elements are provided having preferred cut directions that optimize the shear mode piezoelectric properties. In the discovered cut directions, the crystal elements have super-high piezoelectric performance with d, dand dshear modes at room temperature. The dshear mode crystal gives a maximum d value and is free from the cross-talk of dand d. The dmode is extremely reliable compared to other shear elements due to its ready re-poling capability. The crystal elements may be beneficially used for high-sensitive acoustic transducers.

US Patent:

20090025628, Jan 29, 2009

Filed:

Sep 17, 2008

Appl. No.:

12/212445

Inventors:

PENGDI HAN - Urbana IL, US

International Classification:

C30B 11/14
C30B 13/00
H01L 41/04
H01L 41/22

US Classification:

117 73, 117206, 310357, 29 2535

Abstract:

This invention provides a hybrid Stockbarger zone-leveling melting method for seeded crystallization and the manufacture of homogenous large-sized crystals of lead magnesium niobate-lead titanate (PMN-PT) based solid solutions and related piezocrystals. The invention provides three temperature zones resulting in increased compositional homogeneity and speed of crystal growth, in a cost effective multi-crucible configuration.