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Polarization beam splitter and polarization conversion element

A polarization beam splitter and polarization separation technology, which is applied in the direction of polarizing elements, optical elements, instruments, etc., can solve the problems of unfavorable mass production of polarization beam splitters, high cost, etc., and achieve good polarization separation function, good polarization conversion characteristics, excellent Effect of Polarization Separation Properties

Inactive Publication Date: 2011-06-08
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both such high-refractive-index glass and high-refractive-index substances are relatively expensive, which makes it unfavorable to mass-produce polarizing beam splitters at low cost and high efficiency

Method used

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  • Polarization beam splitter and polarization conversion element
  • Polarization beam splitter and polarization conversion element
  • Polarization beam splitter and polarization conversion element

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Such as figure 1 As shown, the polarizing beam splitter according to Example 1 was designed to have an angle of incidence of 60 degrees. Table 1 shows the configuration of the polarizing beam splitter according to Example 1.

[0051] (Table 1)

[0052]

[0053]

[0054] The terms in Table 1 are described below. "Layer" in the uppermost column indicates a pair of transparent substrate and dielectric film. "Substrate" in the upper part of Table 1 corresponds to figure 1 The transparent substrate 11 is shown. The "substrate" in the lower part of Table 1 corresponds to figure 1 The transparent substrate 12 is shown. Numerals 1 to 46 in the respective layers (hereinafter referred to as layer numbers 1 to 46) indicate the order of stacking the transparent substrate and the dielectric film. "Substance" means the material of the transparent substrate and the dielectric film. "Central wavelength" means the above-mentioned design base wavelength. "Refractive index"...

Deformed example 1

[0091] In Modification 1, the transparent substrate has a refractive index of 1.48 (similar to Example 1, the cross-sectional shape of the transparent substrate is a trapezoid with a base angle of 60 degrees, and the incident angle is set to 60 degrees).

[0092] Figure 4A The transmittance of P polarization (curve 4-1) and the transmittance of S polarization (curve 4-2) of Modification 1 are shown. The transmittance of P polarization is 80% or more in the wavelength range of 360nm to 800nm, and the transmittance of S polarization is substantially 0% in the wavelength range of 400nm to 800nm, which shows a good polarization separation function.

Deformed example 2

[0094] In Modification 2, the transparent substrate has a refractive index of 1.58 (similar to Example 1, the cross-sectional shape of the transparent substrate is a trapezoid with a base angle of 60 degrees, and the incident angle is set to 60 degrees).

[0095] Figure 4B The transmittance of P polarization (curve 4-3) and the transmittance of S polarization (curve 4-4) of Modification 2 are shown. The transmittance of P polarization is 80% or more in the wavelength range of 350nm to 800nm, and the transmittance of S polarization is substantially 0% in the wavelength range of 350nm to 750nm, which shows a good polarization separation function.

[0096] Next, in other modified examples of Example 1, the refractive index of the medium-refractive-index film in the first to third multilayer films was changed.

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Abstract

A polarization beam splitter is effective when light to undergo polarization-splitting has an incidence angle that falls in a range of 54 degrees through 66 degrees. The polarization beam splitter includes, between two transparent substrates, an adhesive layer configured to adhere to a first transparent substrate of the two transparent substrates, two or more types of dielectric multilayer films having different design basis wavelengths, and a single-layer dielectric film. The dielectric multilayer films and the single-layer dielectric film form a polarization split film, which performs a polarization split function with respect to light that is substantially in the visible wavelength region.

Description

technical field [0001] The present invention relates to polarization beam splitters and polarization conversion elements. Background technique [0002] Polarizing beam splitters typically include a polarization splitting film sandwiched between a pair of transparent substrates. A polarizing beam splitter is an optical element that splits incident light into "transmitted light and reflected light" with mutually perpendicular polarization planes. Polarizing beam splitters are used in various types of optics. [0003] When the polarization beam splitter is used in an "optical device using monochromatic light" such as an optical pickup, good polarization separation characteristics can be relatively easily achieved. However, when a polarization beam splitter is used as a polarization conversion element in a liquid crystal projector, "good polarization separation characteristics over the entire visible wavelength range" are required. [0004] Patent Document 1 discloses a polar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02B27/28G02B30/25
Inventor 前田育夫柴田一司
Owner RICOH KK
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