Patent ID: 7574124

Claim:
An adapter lens capable of being detachably attached to a corner of a thin, rectangular body included in a camera provided with an objective lens disposed in an upper corner of a front wall of the body, the adapter lens comprising: a front plate capable of being brought into contact with a part of the front wall of the body around the objective lens an optical member attached to the front plate; a side plate connected to a side part of the front plate and capable of being brought into contact with an upper part of the side surface of the body near the upper corner; an upper plate connected to an upper part of the front plate and capable of being brought into contact with a part of the upper surface of the body near the upper corner; and a rear plate connected to a rear part of the upper plate so as to be swingable and capable of being brought into contact with an upper part of the rear surface of the body near the upper corner; wherein a side part of the front plate opposite the side plate, a side part of the upper plate and a side part of the rear plate define a side opening, opening in a lateral direction, a lower part of the front plate, a lower part of the side plate and a lower part of the rear plate define a lower opening, opening downward, the front plate is brought into contact with the part of the front wall of the body around the objective lens, the side plate is brought into contact with the upper part of the side surface of the body, the upper plate is brought into contact with the part of the upper surface of the body near the upper corner, and the rear plate is brought into contact with the upper part of the rear surface of the body near the corner part when the lens adapter is mounted on the camera an optical axis of the optical member is aligned with an optical axis of the objective lens when the adapter lens is mounted on the camera, the side plate is provided with a laterally projecting boss provided with a threaded hole in its rear surface, the rear plate has a joining part which coincides with the boss when the adapter lens is mounted on the camera, and a screw is screwed through the opening of the joining part into the threaded hole of the boss to hold the lens adapter on the camera.