IMAGING OPTICAL SYSTEM, CAMERA DEVICE AND MOBILE INFORMATION TERMINAL DEVICE

摘要

An imaging optical system, includes: in the order from an object side to an image plane side, a first lens group having a first lens which is formed as a negative lens; a second lens group having a second lens which is formed as a plano-concave lens, a third lens which is formed as a negative meniscus lens, and a fourth lens which is formed as a biconvex lens; an aperture stop; a third lens group having a fifth lens which is formed as a biconvex lens, and a sixth lens which is formed as a biconcave lens; and a fourth lens group having a seventh lens which is formed as a negative meniscus lens.

主权项

1. An imaging optical system, comprising: in the order from an object side to an image plane side,
a first lens group having negative refracting power that includes a negative lens having a concave surface on the image plane side; a second lens group having positive refracting power that includes, in the order from the object side to the image plane side, a negative lens having a concave surface on the object side, and a cemented lens of a negative lens and a positive lens having a convex surface on the object side; an aperture stop; a third lens group having positive refracting power that includes a cemented lens of a positive lens and a negative lens; and a fourth lens group having negative refracting power that includes a negative lens having a concave surface on the object side, wherein the imaging optical system is configured to satisfy the following conditional expression (1):
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