Illumination apparatus and endoscope
An illumination apparatus includes a light source which generates heat when emitting an illumination light from a light-emitting surface, a light guide bundle which has a light-receiving surface opposed to the light-emitting surface of the light source, to receive the illumination light emitted from the light-emitting surface of the light source, and guides the illumination light from the light source received by the light-receiving surface, and a light guide connector which has an end face arranged along the light guide bundle and opposed to the light-emitting surface of the light source, and a contact part in which at least a part of the end face directly contacts the light-emitting surface, and absorbs the heat generated on the light-emitting surface of the light source.
1. An illumination apparatus comprising:
a light source which generates heat when emitting an illumination light from a light-emitting surface;
a light transmission member which has a light-receiving surface opposed to the light-emitting surface of the light source, to receive the illumination light emitted from the light-emitting surface of the light source, and guides the illumination light from the light source received on the light-receiving surface; and
a heat radiation member which has an end face arranged along the light transmission member and opposed to the light-emitting surface of the light source, and a contact part in which at least a part of the end face directly contacts the light-emitting surface, which transmits the light generated in the light source, wherein the end face of the heat radiation member has a non-contact part located outside the light-emitting surface of the light source, in addition to the contact part, and wherein the contact part and the non-contact part of the heat radiation member are on the same level.
2. The illumination apparatus according to claim 1 , wherein the light-receiving surface of the light transmission member has an illumination light incident part which is at least partially located inside the light-emitting surface of the light source.
3. The illumination apparatus according to claim 1 , wherein
an area of the light-receiving surface of the light transmission member is smaller than an area of the light-emitting surface of the light source, and
the light-receiving surface of the light transmission member has an illumination light incident part configured to be housed inside the light-emitting surface of the light source.
4. The illumination apparatus according to claim 3 , wherein
the light-emitting surface of the light source is substantially rectangular, and
the light-receiving surface of the light transmission member is substantially circular and configured to be housed inside the substantially rectangular light-emitting surface.
5. The illumination apparatus according to claim 4 , wherein the non-contact part is located outside the light-emitting surface, with respect to each side of the rectangular light-emitting surface of the light source.
6. The illumination apparatus according to claim 1 , wherein the light-receiving surface of the light transmission member has an illumination light incident part which is at least partially located inside the light-emitting surface of the light source.
7. The illumination apparatus according to claim 1 , wherein the light source is mounted on a mounting substrate which is electrically connected to the opposite side of the light-emitting surface, and has thermal conductivity.
8. The illumination apparatus according to claim 7 , wherein the outside surface of the light source is covered with a resin material to form a heat transmission path between the mounting substrate and heat radiation member.
9. The illumination apparatus according to claim 1 , wherein the heat radiation member has a cylindrical connector, into which the light transmission member is inserted.
10. The illumination apparatus according to claim 1 , wherein
the light transmission member is a light guide bundle, and
the light source includes an LED and fluorescent substance covering the LED, configured to emit white light.
11. An endoscope comprising:
an insertion portion configured to be inserted toward a subject;
an operation portion which is connected to a proximal end of the insertion portion; and
an illumination apparatus according to claim 1 , in which the light-emitting surface of the light source and the end face of the heat radiation member are directly connected inside the operation portion.
12. The endoscope according to claim 11 , wherein the heat radiation member and light source are connected inside the operation portion by a connection member having thermal conductivity.
13. The endoscope according to claim 12 , wherein the connection member is provided closely contacting the heat radiation member.
14. The endoscope according to claim 13 , wherein
the light source is mounted on a mounting substrate which is electrically connected to the opposite side of the light-emitting surface, and has thermal conductivity, and
the connection member is provided with a holding part which is configured to transmit the heat transmitted from the light source to the mounting substrate, and hold the mounting substrate.
15. The endoscope according to claim 12 , wherein
the light source is mounted on a mounting substrate which is electrically connected to the opposite side of the light-emitting surface, and has thermal conductivity, and
the connection member is provided with a holding part which is configured to transmit the heat transmitted from the light source to the mounting substrate, and hold the mounting substrate.
16. The illumination apparatus according to claim 1 , wherein
the end face of the heat radiation member has an annular shape, and
the contact part and the non-contact part of the heat radiation member are formed of a part of the annular shape of the end face of the heat radiation member.
17. The illumination apparatus according to claim 1 , wherein the end face of the heat radiation member has an annular shape by the contact part and the non-contact part.