ENDOSCOPE CAMERA

PROBLEM TO BE SOLVED: To provide a small diameter endoscope camera capable of satisfactorily achieving required optical performance at a low cost.SOLUTION: A lens 10 for endoscope camera is constituted of a single lens 11 having: a convex lens part 15 which has a plane on a first side at the object side and an aspherical convex at the second plane at the image side; and a cylindrical frame part 14 at the outer periphery of the lens 11, which are integrally formed with each other. The lens 11 has a waterproof glass 12 disposed at the first side and a cover glass 22 of an image pick-up element 20 disposed on the image side end face of the frame part 14 of the lens 11, each of which is bonded. The lens 11 is arranged so that the thickness is 0.3 mm or less; the refraction index nd on a d-line is 1.6 or less; and the Abbe number νd calculated from F-line, d-line and C-line is 55 or more.SELECTED DRAWING: Figure 1 【課題】細径であっても低コストで必要とされる光学性能を十分得られる内視鏡カメラを実現する。【解決手段】内視鏡カメラ用レンズ１０は、物体側の第１面に平面を有し像側の第２面に非球面の凸面を有する凸レンズ部１５と、外周部にある筒状の枠部１４とが一体的に形成された１枚構成のレンズ１１を有してなる。レンズ１１の第１面には防水ガラス１２が、レンズ１１の枠部１４の像側端面には撮像素子２０のカバーガラス２２が、それぞれ接着可能に構成されている。レンズ１１は、肉厚が０．３ｍｍ以下、ｄ線の屈折率ｎｄが１．６以下、Ｆ線とｄ線とＣ線から求められるアッベ数νｄが５５以上である。【選択図】図１