Photoirradiation device and fiber rod
First Claim
1. A photoirradiation device which outputs a light beam from an outgoing surface of a lightguide unit, the photoirradiation device comprising:
- a plurality of point light sources;
the lightguide unit which has an incident surface and the outgoing surface, the lightguide unit guiding the light beam incident to the incident surface to the outgoing surface; and
an optical system which focuses the light beams emitted from the plurality of point light sources on the incident surface of the lightguide unit, wherein the plurality of point light sources are arranged on a surface perpendicular to an optical axis of the optical system, the optical system has a first lens, a second lens, and a third lens, which are arranged in order from the point light sources toward the incident surface of the lightguide unit, an incident surfaces and an outgoing surfaces in the first lens and the second lens are formed so that the light beam emitted from the point light source arranged near the optical axis is converted into the light beam substantially parallel to the optical axis, and an incident surface and an outgoing surface of the third lens are formed so that the light beams outgoing from the second lens are focused on the incident surface of the lightguide unit.
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Accused Products
Abstract
A photoirradiation device in which an optical system can be miniaturized and utilization efficiency of light can be improved in a manner that includes a first lens and a second lens, which share refraction of light to convert light beams emitted from a plurality of light sources into the light beams substantially parallel to an optical axis, and a third lens focusing the light beams from the second lens on an incident surface 20A of a lightguide 20. A fiber rod which can output uniform light beams in a manner that includes a first rod having a single fiber and a second rod having a plurality of fibers.
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Citations
11 Claims
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1. A photoirradiation device which outputs a light beam from an outgoing surface of a lightguide unit, the photoirradiation device comprising:
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a plurality of point light sources;
the lightguide unit which has an incident surface and the outgoing surface, the lightguide unit guiding the light beam incident to the incident surface to the outgoing surface; and
an optical system which focuses the light beams emitted from the plurality of point light sources on the incident surface of the lightguide unit, wherein the plurality of point light sources are arranged on a surface perpendicular to an optical axis of the optical system, the optical system has a first lens, a second lens, and a third lens, which are arranged in order from the point light sources toward the incident surface of the lightguide unit, an incident surfaces and an outgoing surfaces in the first lens and the second lens are formed so that the light beam emitted from the point light source arranged near the optical axis is converted into the light beam substantially parallel to the optical axis, and an incident surface and an outgoing surface of the third lens are formed so that the light beams outgoing from the second lens are focused on the incident surface of the lightguide unit. - View Dependent Claims (2, 3, 4, 5, 6, 10, 11)
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7. A fiber rod which guides a light beam incident to an incident surface to output the light beam from an outgoing surface by using a fiber including a high-refractive index core and a low-refractive index clad, the high-refractive index core being coated with the low-refractive index clad, the fiber rod comprising:
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a first rod which has a single fiber whose one end becomes the incident surface; and
a second rod which has the plurality of fibers, the second rod taking the light beam outgoing from another end of the first rod from one end of the second rod and outputting the light beam from the other end which becomes the outgoing surface. - View Dependent Claims (8, 9)
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Specification