Patent ID: 11893719
Assignee: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. The method according to claim 2, wherein in the step 1, the illumination pattern is a semi-annular illumination of three colors of red r, green g, and blue b with an asymmetric axis difference of 120° , wherein the a numerical aperture (NA) of the semi-annular illumination is equal to a NA of the objective lens, and an illumination intensity is distributed sinusoidally, assuming that the NA of the objective lens is expressed as NAobj ; an illumination function for color multiplexing is expressed in a polar coordinate system as:

Sr(ρ,θ)=δ(ρ—NAobj)sin(θ+θr) Sg(ρ,θ)=δ(ρ—NAobj)sin(θ+θg) Sb(ρ,θ)=δ(ρ—NAobj)sin(θ+θb) ( θy+θg−120 ° , θb=θg+120 ° )

where Sr(ρ,θ), Sg(ρ,θ), Sb(ρ,θ) denotes illumination functions corresponding to the three wavelengths of red r, green g. and blue b, respectively, ρ, θ denotes radius and polar angle of the polar coordinate system, respectively, θr,θg,θb are angles of an asymmetry axis of the illumination patterns of red r, green g, and blue b, respectively, and δ(ρ—NAobj) denotes a shape of the illumination pattern being an annulus where the NA of the illumination coincides with the NA of the objective lens.