Loupe and loupe unit
A loupe is bonded to a glasses-type holder to be worn around a head of a user. The loupe includes: a tube framework inserted into a hole or a cutout formed in the glasses-type holder and bonded with a UV adhesive; and a lens held in the tube framework. At least a portion at which the UV adhesive is applied in the tube framework is made of a resin not resistant to acetone and is covered with a paint resistant to acetone.
1. A magnifying loupe bonded to a glasses-type holder to be worn around a head of a user, the magnifying loupe comprising:
a tube framework that is detachably bonded to a transparent plate of the glasses-type holder and that comprises:
a spinning cylinder; and
a static fixture that comprises:
a first cylinder that holds at least two lenses relatively movable in an optical axis direction to vary a distance between the lenses and vary magnification; and
a second cylinder that:
holds an eye lens,
has a smaller diameter than the first cylinder and is connected to the first cylinder, and
is inserted into a hole or a cutout formed in the transparent plate and bonded to the transparent plate with a UV adhesive, wherein
the UV adhesive is soluble in acetone,
the second cylinder is made of resin that is soluble in acetone,
an outer face of the second cylinder is covered with paint that is insoluble in acetone.
2. The magnifying loupe according to claim 1 , wherein the second cylinder is made of a polycarbonate or an ABS (acrylnitrile-butadiene-styrene copolymer) resin.
3. The magnifying loupe according to claim 1 , wherein a two-component acrylic urethane paint is applied between the outer face of the second cylinder and the paint.
4. A magnifying loupe unit comprising:
the magnifying loupe according to claim 1 ; and
the glasses-type holder with the transparent plate having the hole or the cutout, wherein
the second cylinder of the magnifying loupe is inserted into the hole or the cutout and is bonded to the transparent plate with the UV adhesive, and
the glasses-type holder is worn around the head of the user.
5. The magnifying loupe according to claim 1 , wherein the paint is at least one of:
a phenol resin paint;
a fluorinated resin paint;
an unsaturated polyester resin UV paint; and
an acrylic UV paint.
6. A manufacturing method of a loupe unit, comprising:
preparing a loupe that comprises:
a lens; and
a tube framework that holds the lens and that is made of resin soluble in acetone, wherein at least part of an outer face of the tube framework is covered with paint insoluble in acetone;
preparing a glasses-type holder that comprises a transparent plate having a hole or a cutout; and
after adjusting an angle of the tube framework inserted into the hole or the cutoff, bonding the tube framework to the transparent plate with UV adhesive soluble in acetone, wherein
the manufacturing method further comprises:
when an angle adjustment is inadequate, removing the loupe from the transparent plate;
cleaning the outer surface of the loupe with acetone to remove the UV adhesive; and
after readjusting the angle of the tube framework inserted into the hole or the cutoff, bonding the tube framework to the transparent plate with the UV adhesive soluble in acetone.