Abstract: Opening portions (5a and 6a) through which a base (2c) extends to an outside of one side of a core part which is formed by stacking a first core (5) and a second core (6) are formed in the first core (5) and the second core (6) in a transformer (1), and, in the base (2c), a portion which is closer to one region of an exposed core portion A (first region) and an exposed core portion B (second region) is notched, so that the transformer which secures an insulation property and is capable of realizing further size reduction is provided.

Abstract: One embodiment of a multiple flexible wiring board is a multiple flexible wiring board in which a plurality of flexible wiring boards are configured, and in which a first wiring base material, a first covering film layer, a second wiring base material, a second covering film layer, and an adhesive sheet that bonds the first wiring base material and the second wiring base material such that the first covering film layer and the second covering film layer are opposed, and has opening portions that have been formed corresponding to each of the plurality of flexible wiring boards, are layered. A hollow portion of each of the flexible wiring boards is formed between the first wiring base material and the second wiring base material by the opening portions, and auxiliary opening portions are formed alongside the opening portions.

Abstract: One embodiment of a multiple flexible wiring board is a multiple flexible wiring board in which a plurality of flexible wiring boards are configured, and in which a first wiring base material, a first covering film layer, a second wiring base material, a second covering film layer, and an adhesive sheet that bonds the first wiring base material and the second wiring base material such that the first covering film layer and the second covering film layer are opposed, and has opening portions that have been formed corresponding to each of the plurality of flexible wiring boards, are layered. A hollow portion of each of the flexible wiring boards is formed between the first wiring base material and the second wiring base material by the opening portions, and auxiliary opening portions are formed alongside the opening portions.

Abstract: An optical adjustment device capable of correcting spherical aberration with high accuracy in a simple configuration is provided. A second lens holder fits into a guiding portion of a first lens holder, and a grip rack is placed across the second lens holder and a feed screw member and resiliently abuts against the feed screw member. The driving force of a driving source is transmitted to the grip rack via the feed screw member, and the grip rack is displaced. Therefore, it is possible to displace the second lens holder with respect to the first lens holder, and adjust the spherical aberration of an optical system.