Abstract: An image-sensor fixing structure includes an imaging optical system; and an image sensor configured to receive light of an image formed by the imaging optical system. The image sensor has an imaging surface includes an effective region, in which light of an image formed by the imaging optical system is received, and a peripheral region outside the effective region. A body member holding the imaging optical system is fixed to the peripheral region.

Abstract: An optical system includes two imaging optical systems disposed symmetrically with each other; two holders to hold the imaging optical systems; and two shaft members including a first shaft member and a second shaft member. The first shaft member is held by the first hole of the one holder, and the second shaft member is held by the second hole of the one holder. The first shaft member is disposed in the second hole of the other holder with a movement of the first shaft member restricted in each direction perpendicular to a direction in which the first holes are opposed to the second holes. The second shaft member is disposed in the first hold of the other holder with the second shaft member movable in only a certain direction within a plane perpendicular to the direction in which the first holes are opposed to the second holes.

Abstract: An image-sensor fixing structure includes an imaging optical system; and an image sensor configured to receive light of an image formed by the imaging optical system. The image sensor has an imaging surface includes an effective region, in which light of an image formed by the imaging optical system is received, and a peripheral region outside the effective region. A body member holding the imaging optical system is fixed to the peripheral region.

Abstract: A joint structure includes: a plurality of holes open to opposing surfaces of two members that oppose to each other, the holes each being filled with a fluid or powder filler (U) in a state where the holes communicate with each other, such that the two members are relatively fixed by the filler. The holes of the two members each have an inner surface that is wider in cross-sectional direction at a location distant from openings of the holes than at a location close to the openings.

Abstract: An optical system including two imaging optical systems and two holders including one holder to hold one imaging optical system and other holder to hold the other one imaging optical system. Each holder includes a lens positioner to determine a position of a lens constituting each imaging optical system, and two contacts disposed apart from the lens positioner. When the one holder is combined with the other holder, the two contacts of the one holder contact the two contacts of the other holder with the lens maintained at the position determined by the lens positioner of each holder.

Abstract: An optical system includes two imaging optical systems disposed symmetrically with each other; two holders to hold the imaging optical systems; and two shaft members including a first shaft member and a second shaft member. The first shaft member is held by the first hole of the one holder, and the second shaft member is held by the second hole of the one holder. The first shaft member is disposed in the second hole of the other holder with a movement of the first shaft member restricted in each direction perpendicular to a direction in which the first holes are opposed to the second holes. The second shaft member is disposed in the first hold of the other holder with the second shaft member movable in only a certain direction within a plane perpendicular to the direction in which the first holes are opposed to the second holes.

Abstract: A joint structure includes: a plurality of holes open to opposing surfaces of two members that oppose to each other, the holes each being filled with a fluid or powder filler (U) in a state where the holes communicate with each other, such that the two members are relatively fixed by the filler. The holes of the two members each have an inner surface that is wider in cross-sectional direction at a location distant from openings of the holes than at a location close to the openings.