Title:
λ／２位相差板、光学用品及び反射型投射システム
Document Type and Number:
Japanese Patent JP7379970
Kind Code:
B2
Abstract:
To provide a λ/2-retardation plate that can give a preferable conversion ratio of linearly polarized light in a wide wavelength region.SOLUTION: The λ/2-retardation plate has a first positive A-layer and a second positive A-layer, in which the slow axis of the first positive A-layer and the slow axis of the second positive A-layer intersect, and the λ/2-retardation plate satisfies the following condition 1. Condition 1: a spectral transmittance of linearly polarized light in any wavelength region of 120 nm width or more of linearly polarized light incident at an incidence angle α degrees with respect to the λ/2-retardation plate is 2.0% or less in at least one 10-degree width region selected within the range from 30 to 60 degrees of the incident angle α.SELECTED DRAWING: Figure 1
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Inventors:
Tomoki Yamashoulder
Takeshi Kuroda
Takeshi Kuroda
Application Number:
JP2019164862A
Publication Date:
November 15, 2023
Filing Date:
September 10, 2019
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
G02B5/30
Domestic Patent References:
| JP2016090862A | ||||
| JP11149015A | ||||
| JP2013025065A |
Foreign References:
| WO2017169168A1 |
Attorney, Agent or Firm:
Patent Attorney Corporation Otani Patent Office