Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
1999-10-20
2001-11-27
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S330000
Reexamination Certificate
active
06323581
ABSTRACT:
The use of piezo ceramic constructions is known for the production of sound and small, high precision motion. The limiting factor in broader applications is that the level of motion is generally smaller than most low and medium cost manufacturing tolerances can support. The use of precision machining then makes the devices prohibitively expensive and thus limited to higher value added uses.
The motion of piezo ceramic devices can be increased through the use of multiple layer structures, but there are significant efficiency losses between each layer and the gain in motion is disproportionately at the cost of force. For applications such as signalling and light reflection the use of very thin layers can create sizeable movement, but this approach is unacceptable for mechanisms which have to overcome friction and other forces, as the thin members distort under load and so lose their effect. The use of rigid amplifying links is not acceptable because the losses in the pivots are large compared to the initial movement of the bender component. The challenge therefore is to amplify motion without losing power and to combine the motion and release function with the minimum of pivots and associated linkages. Additionally, to offer commercially viable mechanisms the overall device must be compact and robust.
According to the present invention there is provided a two-bladed actuator constructed with two ceramic pieces to create a significant deflection of an operating face within a single layer ceramic and metal construction.
In order that the present invention be more readily understood, an embodiment thereof will now be described by way of example with reference to the accompanying drawings, in which:
FIG. 1
shows a perspective view of an actuator according to the present invention;
FIGS. 2A-2C
show the actuator of
FIG. 1
in different actuation conditions;
FIGS. 3A and 3B
show basic diagrams for explaining a preferred use of the actuator of
FIG. 1
;
FIGS. 4A
to
4
D show diagrammatically the preferred use of the actuator of
FIG. 1
;
FIGS. 5A
to
5
C shows in perspective various components used in the embodiment of
FIG. 4
;
FIG. 6
shows a perspective view of another form of actuator according to the present invention;
FIGS. 7A
to
7
B show one use of an actuator according to the present invention;
FIG. 8
shows one use for a plurality of actuators according to the present invention; and
FIG. 9
shows a construction for a plurality of actuators according to the present invention.
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patent: 4037121 (1977-07-01), Nakamura et al.
patent: 4112279 (1978-09-01), Brohard
patent: 4742260 (1988-05-01), Shimizu et al.
patent: 4812698 (1989-03-01), Chida et al.
patent: 5034649 (1991-07-01), Chida et al.
patent: 5276672 (1994-01-01), Miyazaki et al.
patent: 5491988 (1996-02-01), Hohne et al.
patent: 5600137 (1997-02-01), Saito et al.
patent: 5689380 (1997-11-01), Um
patent: 6079255 (2000-06-01), Binnig et al.
Greenbrook Electrical PLC
Medley Peter
Ramirez Nestor
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