Abstract: An imaging lens may be a retrofocus type imaging optical system including, in order from an object side, a first lens group, an aperture and a second lens group. The first lens group may include, from the object side, a meniscus as a first lens in which a convex surface is formed on the object side, and a meniscus lens as a second lens in which a convex surface is formed on the object side. The second lens group may include a convex lens as a third lens, a biconvex lens as a fourth lens, a biconvex lens as a fifth lens and a sixth lens, and the fifth lens and the sixth lens may be joined to each other. The imaging lens may be constructed with 6 elements and 5 groups including the first lens group and the second lens group.

Abstract: An imaging lens unit includes a resin lens barrel and a plurality of lenses incorporated in the lens barrel. The lens barrel has a lens barrel body and a box-shaped part. A plurality of lens receiving parts are arranged at predetermined intervals in a circumferential direction of the lens barrel body and protrude from an inner peripheral surface of the lens barrel body. The fourth lens is fixed to the lens barrel in a state of being engaged with the plurality of lens receiving parts.

Abstract: An imaging lens includes a front group having negative power, an aperture stop, and a rear group having positive power, in order from an object side. In the front group, a first lens surface has a convex shape toward the object side. In the rear group, a second lens surface has a convex shape toward the object side, a third lens surface has a convex shape toward the image side, and the third lens surface has an infrared ray cut coat. A curvature radius of the second lens surface is represented by Rr, a curvature radius of the third lens surface is represented by Re, a distance from the second lens surface to the third lens surface on an optical axis is represented by Da, and the following condition is satisfied: 1.6<(Rr+|Re |)/Da<2.3.

Abstract: An imaging lens may be a retrofocus type imaging optical system including, in order from an object side, a first lens group, an aperture and a second lens group. The first lens group may include, from the object side, a meniscus as a first lens in which a convex surface is formed on the object side, and a meniscus lens as a second lens in which a convex surface is formed on the object side. The second lens group may include a convex lens as a third lens, a biconvex lens as a fourth lens, a biconvex lens as a fifth lens and a sixth lens, and the fifth lens and the sixth lens may be joined to each other. The imaging lens may be constructed with 6 elements and 5 groups including the first lens group and the second lens group.

Abstract: An imaging lens unit with a plurality of lenses may be incorporated in a lens barrel of resin, the lenses may include, in order from the object side, a first lens group, an aperture, and a second lens group. The first lens group may include, from the object side, a meniscus lens as a first lens with a convex surface on the object side, and a meniscus lens as a second lens with a convex surface on the object side. The second lens group may include, from the object side, a convex lens as a third lens, a biconvex lens as a fourth lens, a biconvex lens as a fifth lens, and a concave lens as a sixth lens. The first lens to the sixth lens may be incorporated in the lens barrel with a reference position between the third lens and the fourth lens.

Abstract: An electric connector for electrically and mechanically connecting two articles, each having a conductive part, is able to reduce the number of electric connectors used in a connecting structure, to reduce the connecting work so as to reduce the costs of the connecting structure, and to make the connecting structure more compact. This electric connector includes a housing, which is fitted to at least one of the articles, and a contact, which is provided on the housing and has a connecting part to be connected to a conductive part of the first article and a contacting part to be made to press against and contact a conductive part of the second article. Elastic deflectable wings or locking pawls protrude from the housing to secure the connector to at least one of the articles.

Abstract: An electric connector is connected to a conductive part, e.g. an electric wire, of a first article, and is fitted onto the first article and/or a second article. The contact of the electric connector directly contacts a conductive part of the second article with a sufficient contact pressure. The electric connector includes a housing fitted onto at least one of the articles, and a contact provided on the housing and including a connecting part connected to the conductive part of the first article, a contacting point contacting the conductive part of the second article, and an elastic part, which undergoes elastic deformation when the contacting point is pressed. The housing and/or the contact has a holding member, which holds the elastic part in an elastically deformed condition in advance in the direction of pressing the contacting point and prevents the restoring movement thereof.

Abstract: An electric connector is connected to a conductive part, e.g. an electric wire, of a first article, and is fitted onto the first article and/or a second article. The contact of the electric connector directly contacts a conductive part of the second article with a sufficient contact pressure. The electric connector includes a housing fitted onto at least one of the articles, and a contact provided on the housing and including a connecting part connected to the conductive part of the first article, a contacting point contacting the conductive part of the second article, and an elastic part, which undergoes elastic deformation when the contacting point is pressed. The housing and/or the contact has a holding member, which holds the elastic part in an elastically deformed condition in advance in the direction of pressing the contacting point and prevents the restoring movement thereof.

Abstract: An electric connector is connected to an electric wire of a first article, and is to be fitted onto the first article and/or a second article. The contact of the electric connector shall directly contact a conductive part of the second article. To prevent the electric wire or the wired contact from coming of the housing of the connector, a retainer is provided. The electric connector's housing has a receiving groove that is recessed into the front housing face which faces the second article, and that has an open groove end at one housing side face and a closed groove end at another housing side face. A contact is inserted into the receiving groove and includes a connecting part to be connected to the electric wire of the first article and a contacting part which is located closer than the connecting part to the closed groove end and which is to contact the conductive part of the second article.

Abstract: When an electric connector, which is connected to an electric wire of a first article, is to be fitted onto the first article and/or a second article, and the contact of the electric connector is to be made to directly contact a conductive part of the second article, it is intended to prevent the electric wire or the wired contact from coming off the housing.

Abstract: When an electric connector, which is connected to an electric wire, etc. being a conductive part of a first article, is to be fitted onto the first article and/or a second article, and the contact of the electric connector is to be made to directly contact a conductive part of the second article, it is intended to secure a sufficient contact pressure between the contact of the electric connector and the conductive part of the second article.

Abstract: To reduce the number of electric connectors used in a connecting structure and reduce the connecting work so as to reduce the costs of the connecting structure and compactify the connecting structure.