PATENT CLAIM ANALYSIS

Application Number: 16119422
Application Type: Utility
Filing Date: 2018-08
Publication Date: 2019-03
Patent Classification: ["353", "101000"]

Abstract:
A projection system includes a first lens group that does not move when the projection magnification is changed with the aid of the zoom function, and the first lens group includes a correction lens group that is moved in the direction of the optical axis to correct worsened astigmatism. The projection system satisfies the following conditional expressions (1) and (2): |ΔBF20|< P ×FNO×√2  (1) 1.5<| f 1/ f|   (2) where P represents the pixel pitch in an image displayed by liquid crystal panels, FNO represents the F number of the entire lens system, ΔBF represents the amount of movement of the back focus position in a case where the correction lens group is moved by the amount of movement for correction of the aberration that changes when the temperature changes by 20° C., f represents the focal length of the entire lens system, and f1 represents the focal length of the correction lens group.

Claim (Index 1):
A projection system that projects an image displayed on an image display device and having a predetermined pixel pitch on a screen and has a zoom function of changing projection magnification, the projection system comprising:\n a first lens group that is located in a position closest to the screen in the projection system and does not move in a direction of an optical axis when the projection magnification is changed with an aid of the zoom function, wherein the first lens group includes a correction lens group that is moved in the direction of the optical axis to correct a change in an aberration produced due to a temperature change and a fixed lens group that is disposed on a side opposite the screen with respect to the correction lens group and does not move in the direction of the optical axis, the correction lens group is formed of one or more lenses arranged from a side facing the screen, and a following conditional expressions (1) and (2) are satisfied:\n |\u0394BF20 |<P \u00d7FNO\u00d7\u221a2\u2003\u2003(1) \n 1.5<| f 1/ f| \u2003\u2003(2) \n where P represents the pixel pitch in the image, FNO represents an F number of an entire lens system, f represents a focal length of the entire lens system, f1 represents a focal length of the correction lens group, and \u0394BF represents an amount of movement of a back focus position in a case where the correction lens group is moved by an amount of movement for correction of the aberration that changes when the temperature changes by 20\u00b0 C.

Metadata:
- Claim Count in Document: 17.0
- Percentile: 96.0
- Lexical Diversity: 2.03529
- Patent Class: 353.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['14456362', '14991248', '12698520', '15601606', '14288421']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.6846740029574346
- 35 USC 102 Novelty (BERT): 0.5196578596216043
- Combined Prediction Score: 0.6681723886238515
- Mean Citation Score: 275.75077400000004
- Max Citation Score: 290.51453
- Similarity Product: 190.5329482045096

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

Dataset: test