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 3):
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, 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 in accordance with the correction characteristic, when a position in the main scanning direction is Xn, a dot position shift is Yn, and a slope an at each of n positions Xn in the main scanning direction is an=(Xn+1\u2212Yn)/(Xn+1\u2212Xn), approximates a position shift based on the first jitter information by an approximation equation Yn=anXn, and when a dot position shift according to the first jitter information at an end position Xeos in the main scanning direction is Yeos, a dot position shift according to the second jitter information at the end position Xeos in the main scanning direction is Y\u2032eos, and a slope a\u2032n of an approximation equation of the correction characteristic is a\u2032n=(Y\u2032eos/Yeos)*an, approximates the correction characteristic by an approximation equation Y\u2032=a\u2032nXn, and changes the frequency of the write clock by a\u2032n.

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