Title:
OPTICAL SCANNER AND IMAGE FORMING APPARATUS
Document Type and Number:
Japanese Patent JP2023034385
Kind Code:
A
Abstract:
To provide an optical scanner that can reduce light quantity unevenness on a surface to be scanned with a compact and simple configuration.SOLUTION: An optical scanner according to the present invention comprises: a deflector that deflects a light beam and scans a surface to be scanned in a main scanning direction; and an imaging optical system that guides the light beam deflected by the deflector to the surface to be scanned and is configured such that the on-axis image height and the most off-axis image height are different from each other in partial magnification in the main scanning direction. When the value of the ratio of the reflectance at a second deflection point for a marginal beam of a most off-axis light beam on one side to the reflectance at a first deflection point for a principal ray of an on-axis light beam is defined as ΔR1, and the value of the ratio of the reflectance at a third deflection point for a marginal beam of the most off-axis light beam on the other side to the reflectance at the first deflection point as ΔR2, conditions of 1.05≤|ΔR1|≤1.50 and 1.05≤|ΔR2|≤1.50 are satisfied.SELECTED DRAWING: Figure 4
Inventors:
SATO RYOTA
KUWABARA TSUGUJI
KUWABARA TSUGUJI
Application Number:
JP2021140602A
Publication Date:
March 13, 2023
Filing Date:
August 31, 2021
Export Citation:
Assignee:
CANON KK
International Classes:
G02B26/12; B41J2/47; H04N1/113
Attorney, Agent or Firm:
Okabe
Takao Ochi
Koji Yoshizawa
Aki Honda
Takao Ochi
Koji Yoshizawa
Aki Honda