Title:
IMAGE DISPLAY UNIT
Document Type and Number:
Japanese Patent JP2020030266
Kind Code:
A
Abstract:
To provide a projector that can switch between a visible light region and a near-infrared region, and correct spherical aberration, which is the problem mainly in terms of the resolution in an infrared mode without sacrificing projection performance in a visible light mode, and block unnecessary visible light.SOLUTION: A wavelength selective filter element having a refractive power on a surface on an enlargement conjugate side is arranged between a projection optical system and an image display element. A wavelength selective filter has a function to block a first wavelength region, and transmit light in a second wavelength region located in a longer wavelength region than the first wavelength region, and can move the entire lens system or some of the lenses in an optical axis direction.SELECTED DRAWING: Figure 1
Inventors:
IIJIMA RYO
Application Number:
JP2018154356A
Publication Date:
February 27, 2020
Filing Date:
August 21, 2018
Export Citation:
Assignee:
CANON KK
International Classes:
G03B21/14; G02B7/00; G02B7/14; G02B13/18; G02B15/20; G02B19/00
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa