PATENT CLAIM ANALYSIS

Application Number: 16090015
Application Type: Utility
Filing Date: 2018-09
Publication Date: 2019-04
Patent Classification: ["355", "071000"]

Abstract:
A coaxial reticle alignment device, a lithography apparatus and alignment methods are disclosed. The coaxial reticle alignment device includes: illumination modules (A, B), each configured to provide an alignment light beam; a projection objective ( 8 ) under a reticle ( 5 ); a reference plate ( 9 ) on a workpiece stage ( 12 ), configured to carry a reference mark ( 10 ); and an image detection and processing module ( 11 ) under the reference plate ( 9 ). The reference mark ( 10 ) is located within a FOV of the image detection and processing module ( 11 ), and during movement of the workpiece stage ( 12 ), the image detection and processing module ( 11 ) receives the alignment light beam having passed sequentially through the reticle alignment mark ( 6, 7 ), the projection objective ( 8 ) and the reference mark ( 10 ), it captures images of the reticle alignment mark ( 6, 7 ) and the reference mark ( 10 ) which are processed to derive relative positional information between the reticle alignment mark ( 6, 7 ) and the reference mark ( 10 ) that enables the alignment of the reticle ( 5 ) with the workpiece stage ( 12 ). The coaxial reticle alignment device adopts dedicated separate illumination means, has a simple structure, allows easy operation and improves alignment efficiency.

Claim (Index 1):
A coaxial reticle alignment device for aligning a reticle with a workpiece stage, comprising:\n an illumination module, configured to irradiate an alignment light beam onto a reticle alignment mark on the reticle; a projection objective, disposed under the reticle and configured to image the reticle alignment mark; a reference plate, disposed on the workpiece stage and configured to carry a reference mark; and an image detection and processing module arranged under the reference plate, wherein the reference mark is located within a field of view of the image detection and processing module, and wherein during movement of the workpiece stage relative to the reticle, the image detection and processing module receives the alignment light beam that has passed sequentially through the reticle alignment mark, the projection objective and the reference mark and hence captures images of the reticle alignment mark and the reference mark, which are processed to derive relative positional information between the reticle alignment mark and the reference mark, so as to align the reticle with the workpiece stage, wherein the reticle is provided with one or more reticle alignment marks; the reference mark and the image detection and processing module are shared by the reticle alignment marks.

Metadata:
- Claim Count in Document: 8.0
- Percentile: 97.0
- Lexical Diversity: 2.84444
- Patent Class: 355.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['11132260', '16089956', '10279924', '14002917', '10998596']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6779045013702503
- 35 USC 102 Novelty (BERT): 0.4854674307798898
- Combined Prediction Score: 0.6586607943112143
- Mean Citation Score: 253.42859
- Max Citation Score: 261.96512
- Similarity Product: 217.83715854297645

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

Dataset: test