Image pickup apparatus

摘要

Provided is an image pickup apparatus including, in order from an object side: a first lens unit; a stop; a second lens unit having a positive refractive power; and an image pickup element. The second lens unit includes a second lens sub-unit including only at least one positive lens. A refractive index (N2a) at a d-line of every lens included in the second lens sub-unit, an Abbe constant (ν2a) and a partial dispersion ratio (θ2a) of the every lens, a temperature-related relative refractive index change (dn2a/dTrelative) at the d-line, a focal length (f) of the overall system, a focal length (f2a) of the second lens sub-unit, an overall length (TD) of an image pickup lens, and a distance (BF) from an image-side surface of a lens arranged closest to an image side in the image pickup lens to an image plane of the image pickup element satisfy predetermined relationships.

主权项

1. An image pickup apparatus, comprising:
an image pickup lens; and an image pickup element, wherein the image pickup lens comprises in order from an object side to an image side:
a first lens unit;a stop; anda second lens unit having a positive refractive power, the second lens unit comprising a second lens sub-unit composed of one or more positive lenses, wherein each of the positive lenses included in the second lens sub-unit is made of material satisfying the following conditions:
62<ν2a; N2a<1.63;0.605−(ν2a/1000)<θ2a; anddn2a/dTrelative←2.4×10−6,where N2a represents a refractive index at a d-line, v2a represents an Abbe constant, θ2a represents a partial dispersion ratio, and dn2a/dTrelative represents an absolute value of a differential of refractive indices against temperature at the d-line, and
wherein the following conditions are satisfied:
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