US 2024/0061220 A1Published application

Optical system and camera module

AssigneeSharp Sensing Technology Corporation

InventorAkihiro IIDA

Life of this patent

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Abstract

An optical system includes: a first lens group; a second lens group disposed behind the first lens group; and a third lens group disposed behind the second lens group. The optical system satisfies: −6.0<f/f2<−2.0; ih/f<0.4; 0.7<TTL/f<1.0; 1.6<Fno/7.0; and Ims/d−OIS>1.5 where ih: a maximum image height of the first lens group, TTL: a distance from a surface of a lens to an image forming surface, Fno: an F number of the first lens group, d−OIS: an absolute value of a distance for which the second lens group is driven in the direction perpendicular to the optical axis, and Ims: an absolute value of a distance for which the image moves in the direction perpendicular to the optical axis on the image plane.

Claims7

Dependent claims

An optical system, comprising:

a first lens group including two or more lenses, having positive power as a whole, and configured to transmit object light;
a second lens group including at least one first lens, having negative power as a whole, disposed behind the first lens group, and configured to transmit the object light;
a third lens group including at least one second lens, having positive power as a whole, disposed behind the second lens group, and configured to collect the object light on an imaging unit;
and
a lens drive device configured to drive the second lens group in a direction perpendicular to an optical axis of the optical system,
wherein, in focusing on an object found at a short distance and emitting the object light, no change is observed in a distance between the third lens group and the imaging unit in a direction of the optical axis,
if the second lens group is driven in the direction perpendicular to the optical axis, an image moves on an image plane of the optical system in the direction perpendicular to the optical axis, and
the optical system satisfies:
−6.0<f/f2<−2.0
ih/f<0.4
0.7<TTL/f<1.0
1.6<Fno/7.0
IMS/d−OIS>1.5 where
f:
an actual focal point of the first lens group, the second lens group, and the third lens group as a whole,
f2:
a focal point of the second lens group,
ih:
a maximum image height of the first lens group, the second lens group, and the third lens group as a whole,
TTL:
a distance from a surface of a lens to an image forming surface, the surface facing the object and the lens being included in the two or more lenses and disposed closest to the object,
Fno:
an F number of the first lens group, the second lens group, and the third lens group as a whole,
d−OIS:
an absolute value of a distance for which the second lens group is driven in the direction perpendicular to the optical axis, and
Ims:
an absolute value of a distance for which the image moves in the direction perpendicular to the optical axis on the image plane, the image moving when the second lens group is driven in the direction perpendicular to the optical axis.

24 more elements

Dependencies are inferred from the claim text.

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Abstract

An optical system, comprising:

a first lens group including two or more lenses, having positive power as a whole, and configured to transmit object light;
a second lens group including at least one first lens, having negative power as a whole, disposed behind the first lens group, and configured to transmit the object light;
a third lens group including at least one second lens, having positive power as a whole, disposed behind the second lens group, and configured to collect the object light on an imaging unit;
and
a lens drive device configured to drive the second lens group in a direction perpendicular to an optical axis of the optical system,
wherein, in focusing on an object found at a short distance and emitting the object light, no change is observed in a distance between the third lens group and the imaging unit in a direction of the optical axis,
if the second lens group is driven in the direction perpendicular to the optical axis, an image moves on an image plane of the optical system in the direction perpendicular to the optical axis, and
the optical system satisfies:
−6.0<f/f2<−2.0
ih/f<0.4
0.7<TTL/f<1.0
1.6<Fno/7.0
IMS/d−OIS>1.5 where
f:
an actual focal point of the first lens group, the second lens group, and the third lens group as a whole,
f2:
a focal point of the second lens group,
ih:
a maximum image height of the first lens group, the second lens group, and the third lens group as a whole,
TTL:
a distance from a surface of a lens to an image forming surface, the surface facing the object and the lens being included in the two or more lenses and disposed closest to the object,
Fno:
an F number of the first lens group, the second lens group, and the third lens group as a whole,
d−OIS:
an absolute value of a distance for which the second lens group is driven in the direction perpendicular to the optical axis, and
Ims:
an absolute value of a distance for which the image moves in the direction perpendicular to the optical axis on the image plane, the image moving when the second lens group is driven in the direction perpendicular to the optical axis.

24 more elements