US 9,958,643 B2 · Optical image capturing system

Abstract

A four-piece optical lens for capturing image and a five-piece optical module for capturing image are provided. In the order from an object side to an image side, the optical lens along the optical axis includes a first lens with positive refractive power; a second lens with refractive power; a third lens with refractive power; and a fourth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the four lens elements are aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.

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Drawings

Claims25

Dependent claims

An optical image capturing system, from an object side to an image side, comprising:

a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power;
a first image plane, which is an image plane specifically for visible light and perpendicular to an optical axis;
a through-focus modulation transfer rate (value of MTF) at a first spatial frequency having a maximum value at central field of view of the first image plane;
and
a second image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis;
the through-focus modulation transfer rate (value of MTF) at the first spatial frequency having a maximum value at central field of view of the second image plane;
wherein the optical image capturing system comprises four lens elements with refractive powers, at least one of the four lens elements has positive refractive power;
focal lengths of the four lens elements are respectively f1, f2, f3 and f4;
a focal length of the optical image capturing system is f, and an entrance pupil diameter of the optical image capturing system is HEP;
a distance on the optical axis from an object-side surface of the first lens element to the first image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, a maximum effective diameter of the image-side surface of the fourth lens element is denoted by PhiA4, half of a maximum viewable angle of the optical image capturing system is denoted by HAF;
the optical image capturing system has a maximum image height HOI on the first image plane perpendicular to the optical axis;
a distance on the optical axis between the first image plane and the second image plane is denoted by FS;
conditions as follows are satisfied:
1≤f/HEP≤10, 0 deg<HAF≤150 deg, 0<PhiA4/InTL≤5, and |FS|≤30 μm.

14 more elements

An optical image capturing system, from an object side to an image side, comprising:

a first lens element with positive refractive power;
a second lens element with refractive power, an image-side surface thereof on the optical axis being a convex surface;
a third lens element with refractive power, an image-side surface thereof on the optical axis being a convex surface;
a fourth lens element with refractive power;
a first image plane, which is an image plane specifically for visible light and perpendicular to an optical axis;
a through-focus modulation transfer rate (value of MTF) at a first spatial frequency having a maximum value at central field of view of the first image plane, and the first spatial frequency being 220 cycles/mm;
a second image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis;
the through-focus modulation transfer rate (value of MTF) at the first spatial frequency having a maximum value at central field of view of the second image plane, and the first spatial frequency being 220 cycles/mm;
and
a first lens positioning element comprising a lens base,
wherein the lens base is hollow and opaque, and the lens base is disposed with a barrel portion and a base portion that are interconnected;
the barrel portion is configured to accommodate the first to fourth lens elements, and the base portion is between the fourth lens element and the first image plane;
an outer perimeter of the base portion is longer than an outer perimeter of the barrel portion;
a shortest side length of the base portion, which is measured on a plane perpendicular to the optical axis, has a maximum value denoted by PhiD, the optical image capturing system comprises four lens elements with refractive powers;
at least one of the second to fourth lens elements has positive refractive power;
focal lengths of the four lens elements are respectively f1, f2, f3 and f4;
a focal length of the optical image capturing system is f;
an entrance pupil diameter of the optical image capturing system is HEP;
a distance on an optical axis from an object-side surface of the first lens element to the first image plane is HOS, a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, half of a maximum viewable angle of the optical image capturing system is denoted by HAF;
the optical image capturing system has a maximum image height HOI on the first image plane perpendicular to the optical axis;
a maximum effective diameter of the image-side surface of the fourth lens element is denoted by PhiA4;
an outline curve starting from an axial point on any surface of any one of the four lens elements, tracing along an outline of the surface, and ending at a coordinate point on the surface that has a vertical height of ½ entrance pupil diameter from the optical axis, has a length denoted by ARE;
a distance on the optical axis between the first image plane and the second image plane is denoted by FS;
conditions as follows are satisfied:
1≤f/HEP≤10, 0 deg<HAF≤150 deg, |FS|≤30 μm, 0 mm<PhiD≤10 mm, and 0.9≤2(ARE/HEP)≤2.0.

22 more elements

An optical image capturing system, from an object side to an image side, comprising:

a first lens element with positive refractive power;
a second lens element with refractive power, an image-side surface thereof on the optical axis being a convex surface;
a third lens element with refractive power, an image-side surface thereof on the optical axis being a convex surface;
a fourth lens element with refractive power;
a first average image plane, which is an image plane specifically for visible light and perpendicular to an optical axis;
the first average image plane being installed at the average position of the defocusing positions, where through-focus modulation transfer rates (values of MTF) of the visible light at central field of view, 0.3 field of view, and 0.7 field of view are at their respective maximum at a first spatial frequency;
the first spatial frequency being 220 cycles/mm;
a second average image plane, which is an image plane specifically for infrared light and perpendicular to the optical axis;
the second average image plane being installed at the average position of the defocusing positions, where through-focus modulation transfer rates of the infrared light (values of MTF) at central field of view, 0.3 field of view, and 0.7 field of view are at their respective maximum at the first spatial frequency;
the first spatial frequency being 220 cycles/mm;
and
a first lens positioning element comprising a lens base;
and
a second lens positioning element accommodated in the lens base,
wherein the lens base is hollow and opaque, and the lens base is disposed with a barrel portion and a base portion that are interconnected;
the barrel portion is configured to accommodate the first to fourth lens elements, and the base portion is between the fourth lens element and the first average image plane;
an outer perimeter of the base portion is longer than an outer perimeter of the barrel portion;
a shortest side length of the base portion, which is measured on a plane perpendicular to the optical axis, has a maximum value denoted by PhiD;
the second lens positioning element comprises a positioning portion and a connecting portion;
the positioning portion is hollow and comes into direct contact with any lens elements to accommodate those lens elements, such that those lens elements are aligned along the optical axis;
the connecting portion is disposed at an outer side of the positioning portion and comes into direct contact with an inner perimeter of the barrel portion;
a maximum outer diameter of the connecting portion, which is measured on a plane perpendicular to the optical axis, is denoted by PhiC;
the optical image capturing system comprises four lens elements with refractive power;
at least one of the third to fourth lens elements has positive refractive power;
focal lengths of the first lens element to the fourth lens elements are respectively f1, f2, f3 and f4;
a focal length of the optical image capturing system is f;
an entrance pupil diameter of the optical image capturing system is HEP;
a distance on the optical axis from an object-side surface of the first lens element to the first average image plane is HOS;
a distance on the optical axis from the object-side surface of the first lens element to an image-side surface of the fourth lens element is InTL, half of a maximum viewable angle of the optical image capturing system is denoted by HAF;
the optical image capturing system has a maximum image height HOI on the first average image plane perpendicular to the optical axis;
a maximum effective diameter of the image-side surface of the fourth lens element is denoted by PhiA4;
an outline curve starting from an axial point on any surface of any one of the four lens elements, tracing along an outline of the surface, and ending at a coordinate point on the surface that has a vertical height of ½ entrance pupil diameter from the optical axis, has a length denoted by ARE;
a distance on the optical axis between the first average image plane and the second average image plane is denoted by AFS;
half of a vertical maximum viewable angle of the optical image capturing system is denoted by VHAF, conditions as follows are satisfied:
1≤f/HEP10, 0 deg<HAF≤150 deg, |AFS|≤30 μm, VHAF≥20 deg, PhiC<PhiD, 0 mm<PhiD≤5 mm, and 0.9≤2(ARE/HEP)≤2.0.

32 more elements

Dependencies are inferred from the claim text.

Description25,548 words

Summary8,459 words

#This application claims priority from Taiwan Patent Application No. 105123104, filed on Jul. 21, 2016, in the Taiwan Intellectual Property Office, the content of which is hereby incorporated by reference in its entirety for all purposes.

#The present disclosure relates to an optical image capturing system, and more particularly to a compact optical image capturing system which can be applied to electronic products.

#In recent years, with the rise of portable electronic devices having camera functionalities, the demand for an optical image capturing system is raised gradually. The image sensing device of ordinary photographing camera is commonly selected from charge coupled device (CCD) or complementary metal-oxide semiconductor sensor (CMOS Sensor). In addition, as advanced semiconductor manufacturing technology enables the minimization of pixel size of the image sensing device, the development of the optical image capturing system directs towards the field of high pixels. Therefore, the requirement for high imaging quality is rapidly raised.

Brief description of the drawings31 figures

#The detailed structure, operating principle and effects of the present disclosure will now be described in more details hereinafter with reference to the accompanying drawings that show various embodiments of the present disclosure as follows.

#FIG. 1A is a schematic view of the optical image capturing system according to the first embodiment of the present invention.

#FIG. 1B shows the longitudinal spherical aberration curves, astigmatic field curves, and optical distortion curve of the optical image capturing system in the order from left to right according to the first embodiment of the present invention.

Detailed description15,798 words

#The present invention has been described with some preferred embodiments thereof and it is understood that many changes and modifications in the described embodiments can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.

#An optical image capturing system, in the order from an object side to an image side, includes a first, second, third and fourth lens elements with refractive power and an image plane. The optical image capturing system may further include an image sensing device which is disposed on an image plane.

#The optical image capturing system may use three sets of operation wavelengths, which are 486.1 nm, 587.5 nm and 656.2 nm, respectively, wherein 587.5 nm is served as the primary reference wavelength and a reference wavelength to obtain technical features of the optical system. The optical image capturing system may also use five sets of wavelengths which are 470 nm, 510 nm, 555 nm, 610 nm and 650 nm, respectively, wherein 555 nm is served as the primary reference wavelength and a reference wavelength to obtain technical features of the optical system.

Facts

Application

15/375,829Filed 12 Dec 2016

Priority

TW 105123104 A21 Jul 2016

Published

US 2018/0024319 A125 Jan 2018

Granted

1 May 2018

Term ends

12 Dec 2036

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification8 codes

G02B 13/004
Having at least one aspherical surface: having four lenses
G02B 5/005
Optical elements other than lenses: diaphragms
G02B 5/208
Filters: for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
G02B 9/34
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having four…

Timeline

21 Jul 2016Priority claimedTW 105123104 A
12 Dec 2016Application filedUS 15/375,829
19 Dec 2016Assigned to Ability Opto-Electronics Technology Co. Ltd.assignment of assignor's interest
25 Jan 2018PublishedUS 2018/0024319 A1
1 May 2018GrantedUS 9,958,643 B2
12 Oct 2026TodayWithin its term
12 Dec 2036Term endsEstimated

Optical image capturing system

Life of this patent

Optical image capturing system

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims25

Description25,548 words

Drawings

Classification8 codes

Life of this patent

Description25,548 words