Piezoelectric actuator and electronic equipment with piezoelectric actuator
First Claim
1. A piezoelectric actuator, comprising:
- a vibrator configured to vibrate by application of voltage, the vibrator having the piezoelectric elements and a reinforcing member that are stacked on each other,the reinforcing member having a free end that has the piezoelectric elements disposed thereon and that has a protuberance in contact with a driven object, and the reinforcing member having a fixed part that is fixedly attached to an attachment part to which the piezoelectric actuator is attached,the free end, when in a state in which no impact is applied to the attachment part from the outside, being disposed apart from to a first protrusion via prescribed first spaces that have specific dimensions, in order to limit displacement of the free end in the stacking direction of the piezoelectric elements and the reinforcing member,the fee end having an arm part on which a hole is formed,the attachment part having a second protrusion that extends towards the hole and that is inserted through the hole,the free end, when in a state in which no impact is applied from the outside, being disposed apart from the second protrusion via prescribed second spaces that have specific dimensions, in order to limit displacement of the free end in a planar direction being perpendicular to the stacking direction,the second spaces being formed between the second protrusion and the inner peripheral edge of the hole in the arm part.
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Accused Products
Abstract
To provide a piezoelectric actuator whereby impact resistance can be greatly improved without complicating the design or causing a reduction in drive efficiency.
When a piezoelectric actuator 31 is incorporated into a main plate 14, an arm part 513 of a vibrator 50 is disposed across from a protrusion 144 via spaces SP1, SP2 having specific dimensions. With the presence of these spaces SP1, SP2, a free end FR moves freely within the spaces SP1, SP2 during driving, but a vibrating part 511 is captured at the free end FR by the protrusion 144 when external impact is applied, and the vibrating part 511 can therefore be prevented from moving beyond the dimensions of the spaces. Resistance against impact from falling can thereby be easily and greatly improved without reducing the drive efficiency, and the usual difficulty of reconciling both drive efficiency and impact resistance can be resolved.
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Citations
16 Claims
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1. A piezoelectric actuator, comprising:
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a vibrator configured to vibrate by application of voltage, the vibrator having the piezoelectric elements and a reinforcing member that are stacked on each other, the reinforcing member having a free end that has the piezoelectric elements disposed thereon and that has a protuberance in contact with a driven object, and the reinforcing member having a fixed part that is fixedly attached to an attachment part to which the piezoelectric actuator is attached, the free end, when in a state in which no impact is applied to the attachment part from the outside, being disposed apart from to a first protrusion via prescribed first spaces that have specific dimensions, in order to limit displacement of the free end in the stacking direction of the piezoelectric elements and the reinforcing member, the fee end having an arm part on which a hole is formed, the attachment part having a second protrusion that extends towards the hole and that is inserted through the hole, the free end, when in a state in which no impact is applied from the outside, being disposed apart from the second protrusion via prescribed second spaces that have specific dimensions, in order to limit displacement of the free end in a planar direction being perpendicular to the stacking direction, the second spaces being formed between the second protrusion and the inner peripheral edge of the hole in the arm part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A piezoelectric actuator, comprising:
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a pair of piezoelectric elements having electrodes; and a reinforcing member configured between the pair of the piezoelectric elements, the reinforcing member having a protuberance in contact with a driven body, the protuberance configured to vibrate by application of voltage to the electrodes in order to drive the driven body, the reinforcing member having a free end and a fixed part, the free end extending away from the pair of piezoelectric elements in a first direction, the fixed part extending away from the pair of piezoelectric elements in a second direction being different from the first direction, the fixed part fixedly attached to an attachment part, the free end being adjacent to a first protrusion via a prescribed first space, in order to limit displacement of the free end in a stacking direction of the pair of the piezoelectric elements and the reinforcing member, the free end having a arm part, a hole being formed in the arm part, the attachment part having a second protrusion that extends towards the hole and that is inserted through the hole, in a state in which no impact is applied to the attachment part from the outside, being disposed apart from the second protrusion via a prescribed second space, in order to limit displacement of the fee end in a planar direction being perpendicular to the stacking direction, the second space being formed between the second protrusion and the inner peripheral edge of the hole in the arm part. - View Dependent Claims (16)
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Specification