Abstract: A polycarbonate resin having a high refractive index, a low Abbe number and a high moisture and heat resistance is provided. In an embodiment, a polycarbonate resin including a structural unit represented by general formula (1) below is provided.

Abstract: A first plate of a filter element includes a first tubular portion having a substantially cylindrical shape that protrudes toward a lid member with the filter element inserted into a filter case. The first tubular portion includes first projections protruding outward in a radial direction. The lid member includes a second tubular portion inserted into a hollow portion of the first tubular portion. With the lid member attached to the first plate, the first projections are inserted into notches formed in ribs provided along an outer circumferential surface of the first tubular portion.

Abstract: A protruding portion is formed on an inner tube inserted into a hollow portion of a filter medium so as to protrude upward from a flange portion. The flange portion having a substantially circular plate shape is disposed on a lower side of a second plate. A recessed portion into which the protruding portion is inserted is formed on a surface on a lower side of the second plate provided so as to cover an opening at a lower end of the filter medium.

Abstract: A speed reducing device according to one aspect of the present disclosure includes: a plurality of speed reducer units arranged in parallel; and an output rotating body that rotates by power received from the speed reducer units. Each of the speed reducer units includes a casing and a speed reducing mechanism unit. The casing has a peripheral wall with inner teeth disposed on an inner periphery of the peripheral wall. The speed reducing mechanism unit meshes with the inner teeth to decelerate input rotation. At least two of the speed reducer units are disposed adjacent to each other such that outer surfaces of peripheral walls of casings thereof are in contact with each other. In at least one of two peripheral walls contacting with each other, a thickness of a contact portion is smaller than a thickness of other portions in a circumference of the same peripheral wall.

Abstract: A speed reducing device according to one aspect of the present disclosure includes: a plurality of speed reducer units arranged in parallel; and an output rotating body that rotates by power received from the speed reducer units. Each of the speed reducer units includes a casing and a speed reducing mechanism unit. The casing has a peripheral wall with inner teeth disposed on an inner periphery of the peripheral wall. The speed reducing mechanism unit meshes with the inner teeth to decelerate input rotation. At least two of the speed reducer units are disposed adjacent to each other such that outer surfaces of peripheral walls of casings thereof are in contact with each other. In at least one of two peripheral walls contacting with each other, a thickness of a contact portion is smaller than a thickness of other portions in a circumference of the same peripheral wall.

Abstract: A first plate of a filter element includes a first tubular portion having a substantially cylindrical shape that protrudes toward a lid member with the filter element inserted into a filter case. The first tubular portion includes first projections protruding outward in a radial direction. The lid member includes a second tubular portion inserted into a hollow portion of the first tubular portion. With the lid member attached to the first plate, the first projections are inserted into notches formed in ribs provided along an outer circumferential surface of the first tubular portion.

Abstract: A protruding portion is formed on an inner tube inserted into a hollow portion of a filter medium so as to protrude upward from a flange portion. The flange portion having a substantially circular plate shape is disposed on a lower side of a second plate. A recessed portion into which the protruding portion is inserted is formed on a surface on a lower side of the second plate provided so as to cover an opening at a lower end of the filter medium.