Title:
SCANNING OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2024/070881
Kind Code:
A1
Abstract:
This scanning optical system is equipped with a deflector and an imaging optical system equipped with a first scanning lens which is nearer said deflector and a second scanning lens which is farther from said deflector. The scanning optical system is configured in a manner such that: the scanning direction is perpendicular to the axis of rotation of the deflector and to the optical axis of the imaging optical system; 0.88≤f/L and d/L≤0.3 are satisfied, if a value obtained by dividing half the scan width by the maximum value of a deflection angle θ is a system focal distance f, the distance from the deflection surface of said deflector to the scanning surface along the optical axis is L, and the distance from the deflection surface to the surface of the second scanning lens which is farther from the deflector is d; when the scanning direction is the y-axis direction, the y-coordinate of the optical axis is 0, and the y-coordinates at the location on the scanning surface of the principal ray of the luminous flux is expressed as a deflection angle θ function, the absolute value of a differential function dy/dθ of said function increases according to the absolute value of the deflection angle θ; and the differential function dy/dθ has a plurality of inflection points which are each in the ranges of -1≤r≤-0.4 or 0.4≤r≤1 if the ratio of the deflection angle to the maximum value of the absolute value of the deflection angle θ is r.
Inventors:
ODA JUMPEI (JP)
KUWAGAITO TOMOHITO (JP)
KUWAGAITO TOMOHITO (JP)
Application Number:
PCT/JP2023/034242
Publication Date:
April 04, 2024
Filing Date:
September 21, 2023
Export Citation:
Assignee:
NALUX CO LTD (JP)
International Classes:
G02B26/10; G02B26/12
Foreign References:
| JP2019095647A | 2019-06-20 | |||
| JP2019028453A | 2019-02-21 | |||
| JP2007240608A | 2007-09-20 | |||
| JP2002048993A | 2002-02-15 | |||
| JP2017116701A | 2017-06-29 | |||
| US6294778B1 | 2001-09-25 |
Attorney, Agent or Firm:
FUSHIMI, Naoya (JP)
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