WAVELENGTH CONVERSION ELEMENT, LIGHT SOURCE APPARATUS, AND IMAGE PROJECTION APPARATUS

• US 20190331993A1
• Filed: 04/18/2019
• Published: 10/31/2019
• Est. Priority Date: 04/25/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Maeda, Yuuki
• Granted Patent: US 10,866,498 B2
• Time in Patent Office: Days
• CPC Class Codes: G03B 21/204 using secondary light emission, e.g. luminescence or fluorescence using different colours G03B33/00; if related to video signals H04N9/3197
• CPC Class Codes: G03B 33/08 Sequential recording or projection G03B33/02, G03B33/04, G03B33/06 take precedence
• CPC Class Codes: H04N 9/3105 for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10

Abstract

A wavelength conversion element includes first to fourth wavelength converters configured to convert incident from a light source into first to fourth light fluxes having first to fourth wavelength band different from a wavelength band of the light from the light source and first to fourth peak intensities at first to fourth wavelengths. The first to fourth wavelengths satisfy predetermined conditions.

Claims

1. A wavelength conversion element comprising:

a first wavelength converter configured to convert light from a light source into first light having a first wavelength band different from a wavelength band of the incident light, and a first peak intensity at a first wavelength;

a second wavelength converter configured to convert the light from the light source into second light having a second wavelength band different from the wavelength band of the incident light, and a second peak intensity at a second wavelength;

a third wavelength converter configured to convert the light from the light source into third light having a third wavelength band different from the wavelength band of the incident light, and a third peak intensity at a third wavelength; and

a fourth wavelength converter configured to converting the light from the light source into fourth light having a fourth wavelength band different from the wavelength band of the incident light, and a fourth peak intensity at a fourth wavelength,

wherein the following condition is satisfied

505 nm<

w<

w2<

585 nm

where w1 is the first wavelength and w2 is the second wavelength,

wherein a wavelength band having an intensity of 30% or higher of the first peak intensity in the first wavelength band and a wavelength band having an intensity of 30% or higher of the second peak intensity in the second wavelength band are different from each other,

wherein the following condition is satisfied

585 nm<

w3<

w4<

670 nm

where w3 is the third wavelength and w4 is the fourth wavelength

wherein a wavelength band having an intensity of 30% or higher of the third peak intensity in the third wavelength band and a wavelength band having an intensity of 30% or higher of the fourth peak intensity in the fourth wavelength band are different from each other, and

wherein the first wavelength converter and the third wavelength converter are laminated or mixed on a first region in the wavelength conversion element, and the second wavelength converter and the fourth wavelength converter are laminated or mixed on a second region in the wavelength conversion element.

2. The wavelength converting element according to claim 1, further comprising:

a fifth wavelength converter configured to converting the light from the light source into fifth light having a fifth wavelength band different from the wavelength band of the light from the light source, and a fifth peak intensity at a fifth wavelength; and

a diffuser configured to diffuse the light from the light source,

wherein the following condition is satisfied

410 nm<

w0<

w5<

505 nm

where w0 is a wavelength at which the light from the light source has a peak intensity and w5 is the fifth wavelength, and

wherein a wavelength band having an intensity of 30% or higher of the fifth peak intensity in the fifth wavelength band and a wavelength band having an intensity of 30% or higher of the peak intensity in the wavelength band of the light from the light source are different from each other.

3. The wavelength conversion element according to claim 2, wherein the first wavelength converter, the third wavelength converter, and the diffuser are laminated or mixed on the first region, and the second wavelength converter, the fourth wavelength converter, and the fifth wavelength converter are laminated or mixed on the second region.

4. The wavelength conversion element according to claim 2, wherein the diffuser is provided on a third region in the wavelength conversion element, and the fifth wavelength converter is provided on a fourth region in the wavelength conversion element.

5. The wavelength converting element according to claim 1, further comprising:

a fifth wavelength converter configured to converting the light from the light source into fifth light having a fifth wavelength band different from the wavelength band of the light from the light source, and a fifth peak intensity at a fifth wavelength; and

a sixth wavelength converter for converting the light from the light source into sixth light having a sixth wavelength band different from the wavelength band of the light from the light source, and a sixth peak intensity at a sixth wavelength,

wherein the following condition is satisfied

410 nm<

w5<

w6<

505 nm

where w5 is the fifth wavelength and w6 is the sixth wavelength, and

wherein a wavelength band having an intensity of 30% or higher of the fifth peak intensity in the fifth wavelength band and a wavelength band having an intensity of 30% or higher of the sixth peak intensity in the sixth wavelength band are different from each other.

6. The wavelength conversion element according to claim 5, wherein the first wavelength converter, the third wavelength converter, and the fifth wavelength converter are laminated or mixed on the first region in the wavelength conversion element, and the second wavelength converter, the fourth wavelength converter, and the sixth wavelength converter are laminated and mixed on the second region in the wavelength conversion element.

7. The wavelength conversion element according to claim 5, wherein the fifth wavelength converter is provided to a third region in the wavelength conversion element, and the sixth wavelength converter is provided to a fourth region of the wavelength conversion element.

8. The wavelength conversion element according to claim 1, wherein at least one of the first to fourth wavelength converters includes at least one of a quantum dot and a quantum rod.

9. A light source apparatus comprising a light source and a wavelength conversion element,

wherein the wavelength conversion element includes:

a first wavelength converter configured to convert light from a light source into first light having a first wavelength band different from a wavelength band of the light from the light source, and a first peak intensity at a first wavelength;

a second wavelength converter configured to convert the light from the light source into second light having a second wavelength band different from the wavelength band of the light from the light source, and a second peak intensity at a second wavelength;

a third wavelength converter configured to convert the light from the light source into third light having a third wavelength band different from the wavelength band of the light from the light source, and a third peak intensity at a third wavelength; and

a fourth wavelength converter configured to converting the light from the light source into fourth light having a fourth wavelength band different from the wavelength band of the light from the light source, and a fourth peak intensity at a fourth wavelength,

wherein the following condition is satisfied

505 nm<

w1<

w2<

585 nm

where w1 is the first wavelength and w2 is the second wavelength,

wherein a wavelength band having an intensity of 30% or higher of the first peak intensity in the first wavelength band and a wavelength band having an intensity of 30% or higher of the second peak intensity in the second wavelength band are different from each other,

wherein the following condition is satisfied

585 nm<

w3<

w4<

670 nm

where w3 is the third wavelength and w4 is the fourth wavelength

wherein a wavelength band having an intensity of 30% or higher of the third peak intensity in the third wavelength band and a wavelength band having an intensity of 30% or higher of the fourth peak intensity in the fourth wavelength band are different from each other, and

wherein the first wavelength converter and the third wavelength converter are laminated or mixed on a first region in the wavelength conversion element, and the second wavelength converter and the fourth wavelength converter are laminated or mixed on a second region in the wavelength conversion element.

10. An image projection apparatus comprising a light source apparatus and a light modulation element configured to modulate light from the light source apparatus, and is configured to display an image by projecting modulated light from the light modulation element onto a projection surface,

wherein the light source apparatus includes a light source and a wavelength conversion element,

wherein the wavelength conversion element includes:

a first wavelength converter configured to convert light from a light source into first light having a first wavelength band different from a wavelength band of the light from the light source, and a first peak intensity at a first wavelength;

a second wavelength converter configured to convert the light from the light source into second light having a second wavelength band different from the wavelength band of the light from the light source, and a second peak intensity at a second wavelength;

a third wavelength converter configured to convert the light from the light source into third light having a third wavelength band different from the wavelength band of the light from the light source, and a third peak intensity at a third wavelength; and

a fourth wavelength converter configured to converting the light from the light source into fourth light having a fourth wavelength band different from the wavelength band of the light from the light source, and a fourth peak intensity at a fourth wavelength,

wherein the following condition is satisfied

505 nm<

w1<

w2<

585 nm

where w1 is the first wavelength and w2 is the second wavelength,

wherein a wavelength band having an intensity of 30% or higher of the first peak intensity in the first wavelength band and a wavelength band having an intensity of 30% or higher of the second peak intensity in the second wavelength band are different from each other,

wherein the following condition is satisfied

585 nm<

w3<

w4<

670 nm

where w3 is the third wavelength and w4 is the fourth wavelength

wherein a wavelength band having an intensity of 30% or higher of the third peak intensity in the third wavelength band and a wavelength band having an intensity of 30% or higher of the fourth peak intensity in the fourth wavelength band are different from each other, and

wherein the first wavelength converter and the third wavelength converter are laminated or mixed on a first region in the wavelength conversion element, and the second wavelength converter and the fourth wavelength converter are laminated or mixed on a second region in the wavelength conversion element.