Abstract: Provided is an optical sight having a lens frame and multiple fixing members for fixing an objective lens to an inside of a barrel body. The objective lens is held on an inner peripheral surface of a lens frame. A male screw, which can be screwed into a female screw arranged on the inner peripheral surface of a barrel body, is arranged on an outer peripheral surface of the lens frame. Multiple through-holes are formed at a wall section of the lens frame corresponding to the outer peripheral surface of the objective lens along a circumferential direction of the wall section. The fixing member is made of metal or synthetic resin having a hardness lower than that of the barrel body. An assembly including the objective lens, the lens frame, and the fixing members is screwed into the female screw arranged on the inner peripheral surface of the barrel body.

Abstract: A compact dot sight is provided, in which the inner cylinder is eliminated and no structure protrudes from the left and right side walls of a lens barrel. The dot sight includes: a lens barrel; objective lenses fixed to a front opening of the lens barrel; an eyepiece lens fixed to a rear opening of the lens barrel; a light source for projecting a point image from an inside of the lens barrel to the objective lens; a power supply circuit for supplying power to the light source; and a dot adjustment mechanism that has a holder of the light source and can adjust the position of the point image projected on the objective lens by moving the holder vertically and horizontally.

Abstract: An optical device includes an impact position adjusting part which is an operation adjusting part. The impact position adjusting part includes a rotating operation part, a shaft part, a fixed tubular part which is a first tubular part formed with outer peripheral recesses-projections, and a rotating tubular part which is a second tubular part formed with inner peripheral recesses-projections. According to an operation of a user, the rotating operation part moves together with the rotating tubular part to a rotatable position at which the outer peripheral recesses-projections and the inner peripheral recesses-projections are separated, and a rotation prohibited position at which the outer peripheral recesses-projections and the inner peripheral recesses-projections are engaged. In a vicinity of an end part on a side close to the rotating tubular part, a width of a projection of the outer peripheral recesses-projections of the fixed tubular part gradually decreases toward the end part.

Abstract: Provided is an optical sight having a lens frame and multiple fixing members for fixing an objective lens to an inside of a barrel body. The objective lens is held on an inner peripheral surface of a lens frame. A male screw, which can be screwed into a female screw arranged on the inner peripheral surface of a barrel body, is arranged on an outer peripheral surface of the lens frame. Multiple through-holes are formed at a wall section of the lens frame corresponding to the outer peripheral surface of the objective lens along a circumferential direction of the wall section. The fixing member is made of metal or synthetic resin having a hardness lower than that of the barrel body. An assembly including the objective lens, the lens frame, and the fixing members is screwed into the female screw arranged on the inner peripheral surface of the barrel body.

Abstract: Provided is a reticle unit 40 that includes a reticle 41 with a sight line 410, and an optical fiber 42 that forms a dot by guiding light from a light source to a center 410a of the sight line 410, wherein a light incident portion 42a for receiving light is formed at one end of the optical fiber 42, a light-emitting portion 42b for emitting light is formed at the other end 42b of the optical fiber 42, the light incident portion 42a has a spherical surface having a diameter greater than that of the optical fiber 42, the light-emitting portion 42b has an inclined surface that reflects light passing through the optical fiber 42, and the optical fiber 42 is fixed along a part of the sight line 410 so that the light-emitting portion 42b is positioned at the center 410a of the sight line 410.

Abstract: A compact dot sight is provided, in which the inner cylinder is eliminated and no structure protrudes from the left and right side walls of a lens barrel. The dot sight includes: a lens barrel; objective lenses fixed to a front opening of the lens barrel; an eyepiece lens fixed to a rear opening of the lens barrel; a light source for projecting a point image from an inside of the lens barrel to the objective lens; a power supply circuit for supplying power to the light source; and a dot adjustment mechanism that has a holder of the light source and can adjust the position of the point image projected on the objective lens by moving the holder vertically and horizontally.

Abstract: A head cooling pillow is provided that is capable of enhancing cooling efficiency for the head, suppressing pressure rise in the inside of the pillow, and improving placing feeling of the head on the pillow. The head cooling pillow includes a pillow main body which is formed in a bag shape and is structured so that refrigerant is passed through its inside, a partition member which is disposed in the inside of the pillow main body for forming the flow passage through which the refrigerant is passed, and a support member structure to support the head of a user. In the head cooling pillow, the head is cooled by the refrigerant passing through the flow passage.

Abstract: Provided is a liquid retainer having a simple structure capable of cooling and warming a part of a human body, predetermined devices, and the like. A liquid retainer includes: a pouch having water blocking properties and flexibility and formed into a pouch shape; and a three-dimensional knit including: a plurality of mesh-like knit garments arranged substantially parallel to each other; and a plurality of coupling strands for coupling the plurality of mesh-like knit garments to each other. The plurality of coupling strands of the three-dimensional knit are made of elastic chemical fiber. The three-dimensional knit is formed into a substantially flat-plate-like shape and arranged in the pouch. Further, the three-dimensional knit retains liquid in the pouch.