Abstract: An endoscope includes: a lens barrel having an opening of a through hole on an outer surface of the lens barrel; a lens inserted into the through hole and having a distal end surface which is disposed in a protruding manner from the outer surface; a first resin disposed between a wall surface of the through hole and a side surface of the lens; and a second resin disposed on a surface of the first resin, a portion of the lens barrel around the opening and an entire circumference of an outer peripheral portion of the distal end surface of the lens, the second resin containing rubber and light blocking particles and having an elastic modulus smaller than an elastic modulus of the first resin.

Abstract: An endoscope includes: a barrel having an opening of a through hole on an outer surface; a lens inserted into the through hole and having a distal end surface which protrudes from the outer surface; a first resin disposed between a wall surface of the through hole and a side surface of the lens; and a second resin disposed on a surface of the first resin, a portion of the barrel disposed around the opening, and an entire circumference of an outer peripheral portion of the distal end surface of the lens, the second resin forming a protruding portion which protrudes from the distal end surface of the optical member, containing light blocking particles, and having a larger fracture toughness value than the first resin.

Abstract: An endoscope includes: an image pickup unit having an incidence face; a distal end body including a front face in which an insertion hole is formed, the incidence face of the image pickup unit inserted into the insertion hole protruding from the front face; a distal end cover that covers a periphery of the insertion hole of the distal end body and has a distal end face including an opening from which the incidence face is protruded; a first adhesive that bonds the distal end cover to the image pickup unit and contains first calcium carbonate particles; and a second adhesive that covers a step at a boundary between the distal end face of the distal end cover and the incidence face of the image pickup unit and contains first silicon oxide particles.

Abstract: An endoscope includes: a barrel having an opening of a through hole on an outer surface; a lens inserted into the through hole and having a distal end surface which protrudes from the outer surface; a first resin disposed between a wall surface of the through hole and a side surface of the lens; and a second resin disposed on a surface of the first resin, a portion of the barrel disposed around the opening, and an entire circumference of an outer peripheral portion of the distal end surface of the lens, the second resin forming a protruding portion which protrudes from the distal end surface of the optical member, containing light blocking particles, and having a larger fracture toughness value than the first resin.

Abstract: An endoscope includes: a lens barrel having an opening of a through hole on an outer surface of the lens barrel; a lens inserted into the through hole and having a distal end surface which is disposed in a protruding manner from the outer surface; a first resin disposed between a wall surface of the through hole and a side surface of the lens; and a second resin disposed on a surface of the first resin, a portion of the lens barrel around the opening and an entire circumference of an outer peripheral portion of the distal end surface of the lens, the second resin containing rubber and light blocking particles and having an elastic modulus smaller than an elastic modulus of the first resin.

Abstract: A graphite heater includes a main body, and a plurality of support portions. The main body includes a tubular portion and a plurality of terminal portions. The plurality of terminal portions extend outward along a central axis of the tubular portion. Each of the plurality of terminal portions has a first planar surface facing the central axis or facing an opposite side of the central axis. The plurality of support portions are each joined to each of the plurality of terminal portions. Each of the plurality of support portions has a second planar surface. The first planar surface and the second planar surface are joined through a carbon-based adhesion layer.