Multi-Wavelength Light Emitting Device

• US 20110063871A1
• Filed: 08/03/2010
• Published: 03/17/2011
• Est. Priority Date: 09/15/2009
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Aoki, Masahiro, Ohtoshi, Tsukuru, TANAKA, Kenichi
• Granted Patent: US 8,449,160 B2
• Time in Patent Office: Days
• US Class Current: 362/553
• CPC Class Codes: G02B 27/0994 Fibers, light pipes optical fibers per se G02B6/02
• CPC Class Codes: G02B 27/1006 for splitting or combining different wavelengths G02B27/1086, G02B27/141 take precedence
• CPC Class Codes: G02B 27/104 for use with scanning systems scanning systems G02B26/10
• CPC Class Codes: G02B 27/123 The splitting element being a lens or a system of lenses, including arrays and surfaces with refractive power
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: H01S 5/02212 Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
• CPC Class Codes: H01S 5/02251 using optical fibres
• CPC Class Codes: H01S 5/4012 Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms
• CPC Class Codes: H01S 5/4087 emitting more than one wavelength
• CPC Class Codes: H01S 5/4093 Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161
• CPC Class Codes: H04N 9/3161 using laser light sources using laser beams scanning the display screen H04N9/3129

Abstract

A multi-wavelength light emitting device includes the following three sections; a light source section having multiple luminous points that emit multiple light beams, a condenser lens section that concentrates the light beams emitted from the luminous points, and a light guide section that propagates superposedly and mixedly the light beams concentrated by the condenser lens section after emission thereof from the luminous points.

Claims

1. A multi-wavelength light emitting device comprising:

a light source section including a plurality of luminous points that emit a plurality of light beams;

a condenser lens section that concentrates the light beams emitted from the luminous points; and

a light guide section that propagates superposedly and mixedly the light beams concentrated by the condenser lens section after emission thereof from the luminous points.

2. The multi-wavelength light emitting device according to claim 1,

wherein at least either one of input and output end faces of the light guide section is provided with an optical element.

3. The multi-wavelength light emitting device according to claim 1,

wherein the light source section, the condenser lens section, and the light guide section are contained in one modular package, which is mounted on a can-stem.

4. The multi-wavelength light emitting device according to claim 1,

wherein the light guide section comprises a component selected from the group consisting of an optical fiber cable, a bundle optical fiber cable, a liquid crystalline fiber cable, a light guide plate, a light tunnel, and a light pipe.

5. The multi-wavelength light emitting device according to claim 1,

wherein the light source section comprises a component selected from the group consisting of a semiconductor laser and a semiconductor light emitting element.

6. The multi-wavelength light emitting device according to claim 1,

wherein the light source section comprises a component selected from the group consisting of a wavelength conversion laser formed with a fundamental-wave semiconductor laser and a nonlinear crystal part serving as a wavelength conversion element, a semiconductor laser, and a semiconductor light emitting element.

7. The multi-wavelength light emitting device according to claim 1,

wherein the light source section comprises a component selected from the group consisting of a wavelength conversion laser formed with a fundamental-wave semiconductor laser and a nonlinear crystal part serving as a wavelength conversion element, a semiconductor laser, and a semiconductor light emitting element, each of which is disposed in a recess of a multilayer laminate substrate.

8. The multi-wavelength light emitting device according to claim 1,

wherein the light source section comprises a wavelength conversion laser formed with a fundamental-wave semiconductor laser and a nonlinear crystal part serving as a wavelength conversion element, and the nonlinear crystal part included in the wavelength conversion laser is mounted by using a multilayer laminate substrate.