US 2026/0299253 A1Published application

Camera module

AssigneeSeikoh Giken Co., Ltd.

InventorTomomi HIRAO

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Abstract

A camera module in which a first lens, an aperture stop, a second lens, a filter, a cover glass and an image sensor are arranged in order from an object side toward an image side, the camera module is configured to satisfy the following conditions (1) through (3) and has a field-of-view angle of 90 degrees or more: (1) 0.1<|r2/r1|<0.4, (2) 0.05<|r4/r3|<0.3, (3) 1.5<d2/d1<3.0, wherein r1: radius of curvature of object-side surface of the first lens, r2: radius of curvature of image-side surface of the first lens, r3: radius of curvature of object-side surface of the second lens, r4: radius of curvature of image-side surface of the second lens, d1: distance on optical axis from object-side surface of first lens to aperture stop, d2: distance on optical axis from aperture stop to photosensitive surface of image sensor.

A camera module in which a first lens having negative refractive power, an aperture stop configured to determine a brightness and a field-of-view angle, a second lens having positive refractive power, a filter configured to reflect or absorb a specific light, a cover glass configured to protect an image sensor, and the image sensor configured to convert a light into an electrical signal are arranged in this order from an object side toward an image side, wherein

an object-side surface of the first lens has a rotationally symmetric aspherical shape having an inflection point such that a region near an optical axis has a concave surface facing the object side and a peripheral portion has a convex surface facing the object side,
an image-side surface of the first lens has a rotationally symmetric aspherical shape having a concave surface facing the image side,
an object-side surface of the second lens has a rotationally symmetric aspherical shape having a convex surface facing the object side,
an image-side surface of the second lens has a rotationally symmetric aspherical shape having a convex surface facing the image side;
the first lens and the second lens are formed of resin;
an effective diameter of the first lens and the second lens through which a light ray passes is the largest on the object-side surface of the first lens,
the effective diameter through which the light ray passes on the object-side surface of the first lens is smaller than a diagonal length of a light-receiving portion of the image sensor, and
the camera module is configured to satisfy the following conditions (1) through (3) and has the field-of-view angle of 90 degrees or more:
0.1
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wherein
r1:
a radius of curvature of the object-side surface of the first lens,
r2:
a radius of curvature of the image-side surface of the first lens,
r3:
a radius of curvature of the object-side surface of the second lens,
r4:
a radius of curvature of the image-side surface of the second lens,
d1:
a distance on the optical axis from the object-side surface of the first lens to the aperture stop, and
d2:
a distance on the optical axis from the aperture stop to a photosensitive surface of the image sensor.

69 more elements

Abstract

Claims4