PATENT CLAIM ANALYSIS

Application Number: 15874568
Application Type: Utility
Filing Date: 2018-01
Publication Date: 2018-07
Patent Classification: ["399", "004000"]

Abstract:
An image forming apparatus includes: an image carrier on which an image is formed; a light source that generates a light beam; an optical scanner that executes scanning of the light beam; a reflection surface identifier that identifies each reflection surface of a rotary polygon mirror; a sub-scanning direction driver that relatively moves the image carrier and the light beam to each other; a storage that stores first jitter information; a photodetector that detects scanning of the light beam; a measurement device that generates second jitter information; and a hardware processor that uses the first and second jitter information to change a frequency of a write clock and adjust a phase of the write clock, wherein the hardware processor obtains a correction characteristic for a dot position shift, and changes the frequency of the write clock and adjusts the phase of the write clock.

Claim (Index 1):
An image forming apparatus comprising:\n an image carrier exposed by a light beam to form an image on the image carrier; a light source that generates the light beam emitted in accordance with image data in synchronization with a write clock; an optical scanner that executes scanning of the light beam in a main scanning direction on the image carrier by a plurality of reflection surfaces of a rotary polygon mirror rotationally driven by a rotary drive source; a reflection surface identifier that identifies each of the reflection surfaces of the rotary polygon mirror; a sub-scanning direction driver that relatively moves the image carrier and the light beam to each other in a sub-scanning direction orthogonal to the main scanning direction; a storage that stores first jitter information of the light beam measured at a plurality of positions in the main scanning direction on each of the reflection surfaces of the rotary polygon mirror; a photodetector that detects scanning of the light beam at a start position and an end position in the main scanning direction; a measurement device that generates second jitter information according to a scanning time from the start position to the end position in the main scanning direction of each of the reflection surfaces of the rotary polygon mirror in accordance with a detection result of the photodetector; and a hardware processor that uses the first jitter information and the second jitter information to change a frequency of the write clock and adjust a phase of the write clock, wherein the hardware processor corrects the first jitter information in accordance with a difference between the first jitter information and the second jitter information at an end of a corresponding reflection surface among the reflection surfaces to obtain a correction characteristic for a dot position shift for each of the reflection surfaces of the rotary polygon mirror, and changes the frequency of the write clock and adjusts the phase of the write clock, in accordance with the correction characteristic.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 86.0
- Lexical Diversity: 2.16667
- Patent Class: 399.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['10197892', '12275787', '15466582', '11822820', '15000854']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7838343708962878
- 35 USC 102 Novelty (BERT): 0.4854036887063195
- Combined Prediction Score: 0.753991302677291
- Mean Citation Score: 232.97013
- Max Citation Score: 252.02989
- Similarity Product: 208.7918550400489

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