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US 10,539,777 B2Granted
Optical unit and endoscope
AssigneeFUJIFILM Corporation
InventorHideyuki Yamada
Life of this patent
Estimating the term…
Abstract
Provided are an optical unit and an endoscope that can enhance the airtightness between a holding tube and a cover glass without a joining member flowing into a distal end surface of an optical lens while maintaining the attachment accuracy of the cover glass. A spacer is disposed between a cover glass position restricting part of a holding tube of an optical unit and a cover glass. The position of the cover glass in an optical axis is restricted by the cover glass position restricting part via a spacer. An external diameter of a first end surface of the spacer is smaller than an internal diameter of a cover glass fixing part of the holding tube. A solder pool part is provided in a region, which is surrounded by a side surface of the spacer, the cover glass fixing part, and the cover glass position restricting part.
Claims8
An optical unit having a distal end, a proximal end, and an optical axis in a first axial direction, the optical unit comprising:
- a cover glass having an incidence surface on the distal end side, an emission surface on the proximal end side, and a side surface;
- an optical lens disposed on the emission surface side of the cover glass;
- a holding tube having a cover glass fixing part that fixes the side surface of the cover glass, a cover glass position restricting part that restricts a position of the cover glass in the first axial direction, and an optical lens position restricting part that restricts a position of the optical lens in the first axial direction;
- and
- a spacer that is disposed between the cover glass and the cover glass position restricting part, has a first end surface and a second end surface at both ends thereof in the first axial direction, and has a window part serving as an optical channel in the first axial direction between the first end surface and the second end surface, the first end surface being a surface disposed on the cover glass side, an external diameter of the first end surface being smaller than an internal diameter of the cover glass fixing part,
- wherein the holding tube includes a cover glass accommodating part that includes an inner wall and a bottom surface, and accommodates the cover glass and the spacer,
- wherein the inner wall of the cover glass accommodating part includes the cover glass fixing part that faces the side surface of the cover glass,
- wherein the bottom surface of the cover glass accommodating part includes the cover glass position restricting part that faces the second end surface of the spacer and fixes the spacer,
- wherein, when a direction perpendicular to the first axial direction is defined as a second axial direction and a direction perpendicular to the first axial direction and the second axial direction is defined as a third axial direction, the cover glass position restricting part restricts positions of the spacer in the first axis direction, the second axis direction and the third axis direction, and
- wherein a solder pool is provided in a region surrounded by the cover glass accommodating part, the cover glass and the spacer.
7 more elements
An endoscope comprising:
- an insertion part inserted into the body;
- and
- an optical unit that is provided at a distal end part of the insertion part and has a distal end, a proximal end, and an optical axis in a first axial direction,
- wherein the optical unit includes
- a cover glass having an incidence surface on the distal end side, an emission surface on the proximal end side, and a side surface,
- an optical lens disposed on the emission surface side of the cover glass,
- a holding tube having a cover glass fixing part that fixes the side surface of the cover glass, a cover glass position restricting part that restricts a position of the cover glass in the first axial direction, and an optical lens position restricting part that restricts a position of the optical lens in the first axial direction, and
- a spacer that is disposed between the cover glass and the cover glass position restricting part, has a first end surface and a second end surface at both ends thereof in the first axial direction, and has a window part serving as an optical channel in the first axial direction between the first end surface and the second end surface, the first end surface being a surface disposed on the cover glass side, an external diameter of the first end surface being smaller than an internal diameter of the cover glass fixing part, and an antireflection treatment layer being provided on at least the first end surface,
- wherein the holding tube includes a cover glass accommodating part that includes an inner wall and a bottom surface, and accommodates the cover glass and the spacer,
- wherein the inner wall of the cover glass accommodating part includes the cover glass fixing part that faces the side surface of the cover glass,
- wherein the bottom surface of the cover glass accommodating part includes the cover glass position restricting part that faces the second end surface of the spacer and fixes the spacer,
- wherein, when a direction perpendicular to the first axial direction is defined as a second axial direction and a direction perpendicular to the first axial direction and the second axial direction is defined as a third axial direction, the cover glass position restricting part restricts positions of the spacer in the first axis direction, the second axis direction and the third axis direction, and
- wherein a solder pool is provided in a region surrounded by the cover glass accommodating part, the cover glass and the spacer.
10 more elements
Dependencies are inferred from the claim text.