Patent ID: 11899278
Assignee: SONY GROUP CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. An imaging apparatus comprising:
an imaging lens and an image pickup device that converts an optical image formed by the imaging lens into an electrical signal,
the imaging lens comprising:
a first lens group always fixed and having positive refractive power, and a first focus lens group that moves in an optical axis direction at a time of focusing from an object at infinity to an object at close range, in order from an object side to an image side;
a last lens group always fixed and having negative refractive power, and a second focus lens group that moves in an optical axis direction at a time of focusing from an object at infinity to an object at close range, in order from the image side to the object side,
at least one of the first focus lens group or the second focus lens group having negative refractive power; and
an aperture stop disposed between the first focus lens group and the second focus lens group,
the imaging lens satisfying Conditional Expression (1) below:

0.4<f/ff<1.0  (1)

where
f: a focal length of a whole system
ff: a combined focal length from the first lens group to the first focus lens group, wherein
the first focus lens group comprises an object-side lens component having negative refractive power and an image-side lens component having negative refractive power, and
the object-side lens component is formed by a cemented lens comprising a positive lens located on the object side and a negative lens located on the image side.