Patent number 8540376 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "The present invention relates to a projector.
"A super luminescent diode (hereinafter also referred to as an 'SLD') is a semiconductor element capable of providing an output up to several tens of mW in the light output characteristic similarly to a semiconductor laser while showing an incoherent property and a wideband spectrum shape similarly to an ordinary light emitting diode. Similarly to a semiconductor laser, the SLD uses a mechanism in which the spontaneous-emission light generated by the recombination of the injected carriers is amplified in accordance with a high gain due to the stimulated emission while proceeding toward a light emitting end surface, and then emitted from the light emitting end surface. It should be noted that unlike the semiconductor laser the SLD requires to prevent formation of the resonator due to the end surface reflection, thereby preventing the laser oscillation from occurring.
"As a measure for preventing the laser oscillation, there has been known a configuration of tilting the gain region (optical waveguide) with respect to the emission end surface as shown in, for example, JP-A-2007-165689. In the technology described in the document mentioned above, two such linear optical waveguides tilted with respect to the emission end surface are formed in order for achieving high output power.
"In the light emitting element provided with the linear gain regions (optical waveguides) tilted with respect to the emission end surface as described above, the light beams emitted from the plurality of gain regions might proceed in respective directions different from each other in some cases. However, if the SLD is used as a light source of a projector, it is preferable that the light beams emitted from the SLD proceed in the same direction. According to such an SLD, it is possible to make the light axis adjustment in the projector easier."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "An advantage of some aspects of the invention is to provide a projector, which is provided with a light emitting device for making the light beams emitted from a plurality of gain regions proceed in the same direction, and is easy in adjusting the light axis.
"According to an aspect of the invention, there is provided a projector including a light emitting device, alight modulation device adapted to modulate a light beam emitted from the light emitting device in accordance with image information, and a projection device adapted to project the image formed by the light modulation device, wherein the light emitting device includes a light emitting element, and an optical member which a light beam emitted from the light emitting element enters, the light emitting element is a super luminescent diode provided with a stacked structure having an active layer sandwiched between a first cladding layer and a second cladding layer, at least a part of the active layer constitutes a first gain region and a second gain region which become current channels of the active layer, a first surface and a second surface out of exposed surfaces of the active layer opposed to each other in the stacked structure, the first gain region is disposed linearly from the first surface to the second surface of the active layer so as to be tilted in a clockwise direction with respect to a perpendicular of the first surface in a plan view along a stacking direction of the stacked structure, the second gain region is disposed linearly from the first surface to the second surface of the active layer so as to be tilted in a counterclockwise direction with respect to a perpendicular of the first surface in the plan view along the stacking direction of the stacked structure, and the optical member refracts the light beams emitted respectively from an end surface of the first gain region on the second surface side and an end surface of the second gain region on the second surface side to thereby emit the light beams as light beams proceeding in the same direction.
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