Light emitting device, illumination device, and photo sensor
First Claim
Patent Images
1. A light emitting device, comprising:
- a semiconductor laser element for emitting laser light, which is coherent laser light;
an optical conversion member for converting the coherent laser light which is emitted from the semiconductor laser element into incoherent light, and for emitting the incoherent light; and
a safety device for preventing the coherent laser light from exiting to an outside of the light emitting device,wherein the safety device includes a photo sensor for detecting intensity of at least one of the incoherent light and the coherent laser light exiting to the outside,the photo sensor includes,a first optical filter for blocking one of light that has substantially the same wavelength as a wavelength of the laser light and the incoherent light and for transmitting at least a portion of other of the light that has substantially the same wavelength as the wavelength of the laser light and the incoherent light, anda light receiving element for detecting intensity of light transmitted through the first optical filter, andthe laser light to be converted by the optical conversion member is a single-wavelength laser light.
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Abstract
Provided is a light emitting device improved in safety to an eye. The light emitting device includes: a semiconductor laser element for emitting laser light; an optical conversion member for converting coherent laser light which is emitted from the semiconductor laser element into incoherent light, and for emitting the incoherent light; and a safety device for preventing the coherent laser light from exiting to an outside.
13 Citations
19 Claims
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1. A light emitting device, comprising:
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a semiconductor laser element for emitting laser light, which is coherent laser light; an optical conversion member for converting the coherent laser light which is emitted from the semiconductor laser element into incoherent light, and for emitting the incoherent light; and a safety device for preventing the coherent laser light from exiting to an outside of the light emitting device, wherein the safety device includes a photo sensor for detecting intensity of at least one of the incoherent light and the coherent laser light exiting to the outside, the photo sensor includes, a first optical filter for blocking one of light that has substantially the same wavelength as a wavelength of the laser light and the incoherent light and for transmitting at least a portion of other of the light that has substantially the same wavelength as the wavelength of the laser light and the incoherent light, and a light receiving element for detecting intensity of light transmitted through the first optical filter, and the laser light to be converted by the optical conversion member is a single-wavelength laser light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A photo sensor for use in a safety device of a light emitting device, comprising:
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an optical conversion member for converting a coherent, single-wavelength laser light emitted from a semiconductor laser element into incoherent light and for emitting the incoherent light, wherein the photo sensor detects intensity of at least one of the incoherent light and the coherent laser light exiting to an outside of the light emitting device, and the photo sensor further comprises, a first optical filter for blocking one of light that has substantially the same wavelength as a wavelength of the laser light and the incoherent light subjected to wavelength conversion by the optical conversion member and for transmitting at least a portion of other of the light that has substantially the same wavelength as the wavelength of the laser light and the incoherent light subjected to the wavelength conversion by the optical conversion member, and a light receiving element for detecting intensity of light transmitted through the first optical filter. - View Dependent Claims (18, 19)
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Specification