Light source apparatus
A light source apparatus includes an optical illumination unit that converts optical characteristics of primary light emitted from a light source unit and emits secondary light different from the primary light; and an adapter unit that outwardly emits illumination light generated based on the secondary light emitted from the optical illumination unit and that is attachable to/detachable from the optical illumination unit. A radiation angle control member converts a traveling direction of the secondary light so that the secondary light allowed to emit from a light conversion member toward the radiation angle control member in the secondary light allowed to emit from the light conversion member travels toward the adapter unit through the secondary light emit portion.
1. A light source apparatus comprising:
a light source unit that emits primary light;
an optical illumination unit that converts optical characteristics of the primary light emitted from the light source unit and emits secondary light different from the primary light; and
an adapter unit that outwardly emits illumination light generated based on the secondary light emitted from the optical illumination unit and that is attachable to/detachable from the optical illumination unit,
wherein a central axis of the primary light emitted from the light source unit is a light axis,
in the light axis direction, the optical illumination unit side is a rear side, the adapter unit side is a front side, and a direction orthogonal to the light axis is a lateral side,
the optical illumination unit comprises:
a light conversion member that converts the optical characteristics of the primary light and generates the secondary light different from the primary light;
a secondary light emit portion that is arranged in the front side to the light conversion member and allows the secondary light to emit to the outside of the optical illumination unit; and
a radiation angle control member that controls a radiation angle of the secondary light allowed to emit to the outside of the optical illumination unit,
the adapter unit comprises:
an adapter unit side incident portion which is optically connected to the secondary light emit portion and from which the secondary light allowed to emit from the secondary light emit portion enters; and
an adapter unit side emit portion that allows the illumination light to emit toward the outside, and
the radiation angle control member converts a traveling direction of the secondary light so that the secondary light allowed to emit from the light conversion member toward the radiation angle control member in the secondary light allowed to emit from the light conversion member travels toward the adapter unit through the secondary light emit portion;
wherein a beam divergence angle of the radiation angle control member of the adapter unit is different than a beam divergence angle of the radiation angle control member of the optical illumination unit.
2. The apparatus according to claim 1 ,
wherein the optical illumination unit further comprises:
a primary light incident portion from which the primary light enters and which is smaller than the secondary light emit portion; and
a holding section that comprises an incident opening portion fitted into the primary light incident portion side, an emit opening portion fitted into the secondary light emit portion side, and a hollow portion continuous from the incident opening portion to the emit opening portion in the light axis direction to hold the primary light incident portion and the secondary light emit portion, and
the radiation angle control member comprises a reflection member that is arranged on an inner peripheral surface of the holding section and reflects the secondary light toward the secondary light emit portion.
3. The apparatus according to claim 2 , wherein the light conversion member is arranged in the hollow portion in such a manner that it is arranged away from the primary light incident portion and ahead of the primary light incident portion.
4. The apparatus according to claim 3 ,
wherein the optical illumination unit further comprises a light transmission member that comprises the primary light incident portion and the secondary light emit portion, is arranged between the primary light incident portion and the light conversion member, and arranged to be at least partially continuous from the primary light incident portion to the secondary light emit portion so that the primary light and the secondary light are transmitted there through,
the light transmission member is fitted into the hollow portion, and
the light conversion member is contained in the light transmission member.
5. The apparatus according to claim 3 ,
wherein the optical illumination unit further comprises a light transmission member that comprises the primary light incident portion, is arranged between the primary light incident portion and the light conversion member, and arranged to be at least partially continuous from the primary light incident portion to the light conversion member so that the primary light and the second light are transmitted there through,
the light transmission member is fitted into the hollow portion, and
the light conversion member is arranged ahead of the light transmission member and comprises the secondary light emit portion.
6. The apparatus according to claim 4 ,
wherein the optical illumination unit further comprises a light guide member that guides the primary light emitted from the light source unit,
the light guide member comprises an emit portion that is optically connected to the primary light incident portion and allows the primary light to emit therefrom, and
L 3≧( L 2− L 1)×tan θ is achieved,
provided that the center of the emit portion is an origin O,
an intersection of the light axis and light conversion member is a point A,
an intersection of the light axis and the secondary light emit portion is a point B,
the farthest point from the point B in the secondary light emit portion is a point C,
an intersection of the light axis and the adapter unit side incident portion is a point D,
the farthest point from the point D in the adapter unit side incident portion is a point E,
a distance between the origin O and the point A is a distance L,
a distance between the origin O and the point B is a distance L2,
a distance between the point D and the point E is a distance L3, and
an angle formed among the points B, A, and C is an angle θ.
7. The apparatus according to claim 6 , wherein each of the light transmission member and the hollow portion has a truncated conical shape whose diameter increases from the rear side toward the front side in the light axis direction.
8. The apparatus according to claim 7 ,
wherein the adapter unit further comprises:
an adapter unit side light conversion member that converts optical characteristics of the secondary light and generates tertiary light different from the secondary light as the illumination light;
an adapter unit side holding section that comprises an adapter unit side incident opening portion fitted into the adapter unit side incident portion side, an adapter unit side emit opening portion fitted into the adapter unit side emit portion side, and an adapter unit side hollow portion continuous from the adapter unit side incident opening portion to the adapter unit side emit opening portion in the light axis direction to hold the adapter unit side incident portion and the adapter unit side emit portion; and
an adapter unit side reflection member that is arranged on an inner peripheral surface of the holding section and reflects the secondary light in such a manner that the secondary light travels to the adapter unit side emit portion,
the adapter unit side light conversion member is arranged in the adapter unit side hollow portion, and
the adapter unit side incident portion is smaller than the adapter unit side emit portion.
9. The apparatus according to claim 6 , wherein each of the light transmission member and the hollow portion has a columnar shape.
10. The apparatus according to claim 4 ,
wherein each of the light transmission member and the hollow portion has a parabolic shape, and
the light conversion member is arranged in the vicinity of a focal point of a parabola.
11. The apparatus according to claim 10 ,
wherein the adapter unit further comprises:
an adapter unit side light conversion member that converts optical characteristics of the secondary light and generates tertiary light different from the secondary light as the illumination light;
an adapter unit side holding section that comprises an adapter unit side incident opening portion fitted into the adapter unit side incident portion side, an adapter unit side emit opening portion fitted into the adapter unit side emit portion side, and an adapter unit side hollow portion continuous from the adapter unit side incident opening portion to the adapter unit side emit opening portion in the light axis direction to hold the adapter unit side incident portion and the adapter unit side emit portion; and
an adapter unit side reflection member that is arranged on an inner peripheral surface of the holding section and reflects the secondary light in such a manner that the secondary light travels to the adapter unit side emit portion,
the adapter unit side light conversion member is arranged in the adapter unit side hollow portion, and
the adapter unit side incident portion has a size substantially the same as the adapter unit side emit portion.
12. The apparatus according to claim 8 or 11 ,
wherein the adapter unit side light conversion member has the adapter unit side emit portion and is arranged to cover the entire adapter unit side emit opening portion.
13. The apparatus according to claim 12 ,
wherein the light conversion member is formed of at least one of a diffusion member, a spectral conversion member, a light distribution conversion member, a wavelength selection filter, a dimming member, and an optical member, and
the adapter unit side light conversion member is formed of at least one of the spectral conversion member, the light distribution conversion member, the wavelength selection filter, the dimming member, and the optical member.
14. The apparatus according to claim 1 ,
wherein the light conversion member also functions as a light guide member that guides the primary light emitted from the light source unit,
the light guide member comprises an emit portion that is optically connected to the primary light incident portion and allows the primary light to emit therefrom,
the light guide member comprises a bundle fiber formed by bundling optical fiber strands, and
the optical fiber has softness and flexibility.
15. The apparatus according to claim 1 ,
wherein the optical illumination unit further comprises a light guide member that guides the primary light emitted from the light source unit, and
the light guide member is formed of at least one of a single optical fiber strand, a bundle fiber, a light pipe, and a light wave guide device.
16. The light source apparatus according to claim 1 , wherein a front side of the radiation angle control member of the adapter unit is at least a same size as a rear side of the radiation angle control member of the optical illumination unit.
17. The light source apparatus according to claim 1 , wherein a front side of the radiation angle control member of the adapter unit is larger than a rear side of the radiation angle control member of the optical illumination unit.
18. The light source apparatus according to claim 1 , wherein each of the rear and front sides of the adapter unit has a diameter greater than the front side of the optical illumination unit.
19. The light source apparatus according to claim 1 , wherein the adapter unit side emit portion of the adapter unit has a diameter larger than a diameter of the secondary light emit portion of the optical illumination unit.
20. The light source apparatus according to claim 1 , wherein a beam divergence angle of the radiation angle control member of the adapter unit is larger than a beam divergence angle of the radiation angle control member of the optical illumination unit.