Patent ID: 7458735
Filing Date: 2008-12-02
Classification: G02B

Abstract:
1. An image-taking lens unit comprising: an image-taking lens system that forms an optical image of an object; and an image sensor that receives the optical image in a rectangular image-sensing region and converts the optical image into an electrical signal, wherein the image-taking lens system includes a reflective optical element that bends an optical path, and wherein, of lens elements constituting the image-taking lens system, a most image-side lens element called a last lens element is molded of resin, and is given a non-circular outer shape fulfilling conditional formula (1) below: where TS represents a maximum outer dimension in a direction parallel to shorter sides of the image-sensing region; and TL represents a maximum outer dimension in a direction parallel to longer sides of the image-sensing region, wherein conditional formula (la) below is fulfilled: and wherein conditional formula (2) below is fulfilled: where LD represents a diagonal length of the image-sensing region; FN represents an f-number of the image-taking lens system (a minimum value of the f-number in a case where the f-number varies); and LB represents an air-equivalent distance from a vertex of an image-side surface of the last lens element to an image surface (a maximum value of the distance in a case where the distance varies).