EP0388027A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Displacement generating apparatus
Assignee: Toshiba Corp
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Filing: 1990-02-19
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Granted: —
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Expires: 2010-02-19
Abstract
Abstract An electrostriction actuator (10) comprises upper and lower electrostriction boards (12, 14), having electrodes (12a, 12b; 14a, 14b) individually on either side thereof, and a conductive shim (16) interposed between the inside electrodes (12b, 14b). The actuator (10) has a fixed end at one end thereof and a free end for bending movement at the other end. An amplifier (18) for supplying driving voltage to the actuator (10) is an inverted amplifier, whose output terminal is connected to the shim (16), so that an output voltage is supplied to the inside electrodes (12b, 14b). The outside electrode (12a) of the upper electrostriction board (12) is connected to a power source (not shown) for supplying constant voltage (+E₀) to the amplifier (18), and the outside electrode (14a) of the lower electrostriction board (14) is connected to a power source (not shown) for supplying constant voltage (-E₀) to the amplifier (18).
Inventors
- 👤 Yuu C/O Intellectual Property Division Kondou
- 👤 Tomio C/O Intellectual Property Division Ono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:04
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/20; H10N30/204; H10N30/2041; H10N30/2042; H10N30/80; H10N30/802
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A displacement generating apparatus characterized by comprising: an electrostriction actuator (10) of a bimorph structure having two electrostriction boards (12, 14) stacked in layers, said actuator (10) including an inside electrode (12b, 14b) disposed between the two electrostriction boards (12, 14) and two outside electrodes (12a, 14a) arranged outside the electrostriction boards (12, 14); and means for supplying a driving voltage to the electrostriction actuator (10), said supply means supplying the driving voltage to the inside electrode (12b, 14b), applying a constant voltage not lower than the maximum value of the driving voltage to one of the outside electrodes (12a, 14a), and applying a constant voltage not higher than the minimum value of the driving voltage to the other outside electrodes (12a, 14a).
Claim 2
Dependent Claim
123 words
A displacement generating apparatus characterized by comprising: an electrostriction actuator (10) of a bimorph structure having two electrostriction boards (12, 14) stacked in layers, said actuator (10) including an inside electrode (12b, 14b) disposed between the two electrostriction boards (12, 14) and two outside electrodes (12a, 14a) arranged outside the electrostriction boards (12, 14); and means for supplying a driving voltage to the electrostriction actuator (10), said supply means supplying the driving voltage to the inside electrode (12b, 14b), applying a constant voltage not lower than the maximum value of the driving voltage to one of the outside electrodes (12a, 14a), and applying a constant voltage not higher than the minimum value of the driving voltage to the other outside electrodes (12a, 14a).
Claim 3
Dependent Claim
163 words
A displacement generating apparatus characterized by comprising: an electrostriction actuator (20) of a bimorph structure having M (M ≧ 2) number of electrostriction boards (22, 24, 26, 28, 30, 32) stacked in layers, said actuator (20) including (M + 1) number of electrodes (34, 36, 38, 40, 42, 44, 46) and between the electrostriction boards (22, 24, 26, 28, 30, 32); and means for supplying a driving voltage to the electrostriction actuator (20), said supply means supplying the driving voltage to the (N + 2n)th-layer (1 < N < M + 1; n = 0, ±1, ±2, ...) electrode (36, 40, 44), applying a constant voltage not lower than the maximum value of the driving voltage to the (N + 1 + 2n)th-layer (n = 0, 1, 2, ...) electrode (34, 38), and applying a constant voltage not higher than the minimum value of the driving voltage to the (N - 1 - 2n)th-layer (n = 0, 1, 2, ...) electrode (42, 46).
Claim 4
Dependent Claim
163 words
A displacement generating apparatus characterized by comprising: an electrostriction actuator (20) of a bimorph structure having M (M ≧ 2) number of electrostriction boards (22, 24, 26, 28, 30, 32) stacked in layers, said actuator (20) including (M + 1) number of electrodes (34, 36, 38, 40, 42, 44, 46) and between the electrostriction boards (22, 24, 26, 28, 30, 32); and means for supplying a driving voltage to the electrostriction actuator (20), said supply means supplying the driving voltage to the (N + 2n)th-layer (1 < N < M + 1; n = 0, ±1, ±2, ...) electrode (36, 40, 44), applying a constant voltage not lower than the maximum value of the driving voltage to the (N + 1 + 2n)th-layer (n = 0, 1, 2, ...) electrode (34, 38), and applying a constant voltage not higher than the minimum value of the driving voltage to the (N - 1 - 2n)th-layer (n = 0, 1, 2, ...) electrode (42, 46).
Claim 5
Dependent Claim
38 words
The apparatus according to claim 2, characterized in that said N is given by N = M/2 where M is an even number, and is given by N = (M ± 1)/2 where M is an odd number.
Claim 6
Dependent Claim
36 words
The apparatus according to claim 1, characterized in that said constant voltages not lower than the maximum value and not higher than the minimum value are equal to a constant voltage supplied to the supply means.
Claim 7
Dependent Claim
36 words
The apparatus according to claim 2, characterized in that said constant voltages not lower than the maximum value and not higher than the minimum value are equal to a constant voltage supplied to the supply means.
References Cited (Backward Citations)
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