PATENT CLAIM ANALYSIS

Application Number: 16443690
Application Type: Utility
Filing Date: 2019-06
Publication Date: 2019-10
Patent Classification: ["360", "294400"]

Abstract:
A PZT microactuator such as for a hard disk drive has a restraining layer bonded on its side that is opposite the side on which the PZT is mounted. The restraining layer comprises a stiff and resilient material such as stainless steel. The restraining layer can cover most or all of the top of the PZT, with an electrical connection being made to the PZT where it is not covered by the restraining layer. The restraining layer reduces bending of the PZT as mounted and hence increases effective stroke length, or reverses the sign of the bending which increases the effective stroke length of the PZT even further. The restraining layer can be one or more active layers of PZT material that act in the opposite direction as the main PZT layer. The restraining layer(s) may be thinner than the main PZT layer.

Claim (Index 1):
A multi-layer piezoelectric microactuator assembly for effecting fine positional movements, the microactuator assembly comprising:\n a first piezoelectric layer and a second piezoelectric layer, the first piezoelectric layer being closest to a surface to which the microactuator assembly is bonded; a first electrode on a bottom side of the first piezoelectric layer; a second electrode on a top side of the first piezoelectric layer and disposed underneath the second piezoelectric layer, there being no electrode between the first and second electrodes such that a distance between the first and second electrodes defines a thickness of the first piezoelectric layer, and such that a voltage applied across the first and second electrodes induces an electric field across the first piezoelectric layer thereby causing the first piezoelectric layer to expand or contract; and a third electrode on a top side of the second piezoelectric layer, there being no electrode between the second and third electrodes such that a distance between the second and third electrodes defines a thickness of the second piezoelectric layer, and such that a voltage applied across the second and third electrodes induces an electric field across the second piezoelectric layer thereby causing the second piezoelectric layer to expand or contract; wherein the second piezoelectric layer comprises the same material as the first piezoelectric layer and is thinner than the first piezoelectric layer; and wherein the first and second piezoelectric layers are poled such that when a microactuator activation voltage is applied to the microactuator assembly, the first and second piezoelectric layers tend to act in opposite directions.

Metadata:
- Claim Count in Document: 41.0
- Percentile: 100.0
- Lexical Diversity: 1.97436
- Patent Class: 360.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['15055618', '14672122', '15055633', '14620120', '15227780']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7763221400526771
- 35 USC 102 Novelty (BERT): 0.6423490276442185
- Combined Prediction Score: 0.7629248288118313
- Mean Citation Score: 569.556448
- Max Citation Score: 596.5588
- Similarity Product: 582.1896589249611

Labels:
- Claim Label 101: 0
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 0
- Label 101 Adjusted: 0

Dataset: test