KR20160125688A

KR20160125688A - Camera Module for Iris Recognition

Info

Publication number: KR20160125688A
Application number: KR1020150056442A
Authority: KR
Inventors: 김기현; 사진성; 황석진
Original assignee: (주)옵토라인
Priority date: 2015-04-22
Filing date: 2015-04-22
Publication date: 2016-11-01

Abstract

A camera module for iris recognition is provided. According to the present invention, the camera module for iris recognition comprises: an optical system which has a spacer between a first lens and a second lens, and has an IR pass filter that passes an infrared wavelength band included in light passing through the first and second lenses; a lens barrel including the optical system embedded therein; a substrate which has an image sensor that obtains an iris image of light passing through the optical system, on a mount surface on which a barrel housing assembled with the lens barrel is mounted, and has a light source for generating light when power is applied; and a protection casing which forms a first exposure hole corresponding to a lens hole of the lens barrel and allowing light to pass therethrough, forms a second exposure hole to irradiate light generated from the light source to a subject, and is coupled to the substrate to cover the barrel housing.

Description

Camera module for Iris Recognition "

The present invention relates to an iris recognition camera module, and more particularly, to an iris recognition camera module capable of increasing the image acquisition rate of the iris of the pupil in the use environment requiring iris recognition, .

In general, public certificates are widely used in all electronic commerce fields such as smartphones, computers, laptops, internet shopping, online banking, mobile stock trading, and internet electronic filing.

Such an authorized certificate is an online ID card that is necessary to confirm the user for convenient electronic commerce, but there is a security vulnerability because a public certificate file and a password can be leaked by hacking.

Accordingly, biometrics technology using biometric information such as voice, fingerprint, and iris has been actively researched as one measure for solving the weak problem of security of the public certificate.

In this biometric technology, human iris has a probability of having the same pattern of only 1/6 billion, so it is known that it has the highest security among the biometric technologies currently implemented. Currently, the United States, Japan, In many countries, identity verification through iris recognition has been applied to various devices as identification means.

(Patent Document 1) KR 2002-0042044 A

(Patent Document 2) KR10-1323483 B

Patent Document 1 discloses an iris recognition system including an iris recognition chip for extracting an iris code from an iris image photographed by a camera installed in a terminal such as a smart phone, An authentication device for recognition is disclosed.

In Patent Document 2, a visible ray region included in an image of an object incident through a lens system is passed through the lens system so that an image of a general visible ray wavelength band and an image of an infrared ray wavelength band for iris recognition can be selectively photographed by a single camera Discloses a camera for iris recognition combined with an image sensor provided with a reflection pass filter for reflecting an infrared region and installed for obtaining an iris image of an infrared region reflected by a reflection pass filter.

However, in order to increase the accuracy of the iris image acquired from the camera installed in the terminal, the infrared filter for blocking light in the near infrared ray region or the infrared ray region must be additionally provided in the camera, There has been a problem that a design change is required to be applied.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an iris recognition apparatus, an iris recognition method, an iris recognition method, And a camera module for recognition.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to an aspect of the present invention, there is provided an optical pickup device comprising a first lens and a second lens, a spacer provided between the first lens and the second lens, an IR pass filter for passing an infrared wavelength band included in light passing through the first and second lenses, An optical system comprising: A lens barrel having the optical system built therein; A substrate provided with an image sensor for acquiring an iris image of light passing through the optical system on a mount surface on which the barrel housing assembled with the lens barrel is mounted and an illumination source for generating light upon power application; And a second exposure hole passing through the first exposure hole through which the light passes, corresponding to the lens hole of the lens barrel, and passing through the second exposure hole to irradiate the light generated from the illumination source to the subject, And a protective casing coupled to the iris recognition camera module.

Preferably, the protective casing is provided with a reflective mirror of a predetermined size so as to be able to confirm the iris of the subject on the outer surface corresponding to the first exposure hole.

Preferably, the second exposure hole is formed such that an inner surface thereof is inclined so that light generated from the illumination source can be focused and illuminated on the iris side of the pupil, which is a subject positioned at a focal distance from the optical system.

Preferably, the IR pass filter is disposed between the first lens and the lens hole of the lens barrel, or disposed between the first lens and the second lens or between the second lens and the image sensor.

Preferably. Wherein a radius of curvature of the first surface of the first lens facing the lens is 1.188 to 1.208 when the focal length between the optical system and the iris is 180 mm and a curvature of the second surface of the first lens facing the second lens The radius is 3.880 to 3.991.

Preferably, when the focal length between the optical system and the iris is 200 mm, the radius of curvature of the first surface of the first lens facing the lens hole is 1.211 to 1.231, and the second lens of the second lens facing the second lens The radius of curvature of the surface is 4.368 to 4.389.

Preferably, when the focal length between the optical system and the iris is 180 mm, the radius of curvature of the first surface of the second lens facing the first lens is -0.693 to -0.674, and the second surface facing the image sensor Is 1.277 to 1.297.

Preferably, when the focal length between the optical system and the iris is 200 mm, the radius of curvature of the first surface of the second lens facing the first lens is -0.599 to -0.578, and the second surface facing the image sensor Has a radius of curvature of 0.820 to 0.841.

The present invention as described above has the following effects.

(1) In the use environment requiring iris recognition, the wavelength band of the visible light region is blocked in the image of the subject passing through the optical system, and the recognition rate of the iris of the pupil, which is a subject, can be increased by passing through only the wavelength band of the infrared region The product reliability can be enhanced.

(2) By forming a reflection mirror on the outer surface of the protective casing exposed to the outside, the reflection mirror being in the first exposure hole coinciding with the lens hole, the center of the pupil and the center of the lens hole are made to coincide with each other, It is possible to increase the image acquisition rate of the iris, which is the subject, since the position of the pupil of the user reflected on the mirror can be confirmed.

(3) It is possible to increase the recognition rate and the image acquisition rate for the iris image by the illumination focused on the user's pupil at the iris capturing.

1 is an exploded perspective view showing an iris recognition camera module according to a preferred embodiment of the present invention.
2 is an assembled view illustrating an iris recognition camera module according to a preferred embodiment of the present invention.
3 is an operational state diagram showing an iris recognition camera module according to a preferred embodiment of the present invention.
4 is an external view of a terminal to which the iris recognition camera module according to the preferred embodiment of the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to include an element does not exclude other elements unless specifically stated otherwise, but may also include other elements.

1 to 3, an iris recognition camera module 100 according to a preferred embodiment of the present invention includes an optical system 110, a lens barrel 120, a barrel housing 130, a substrate 140, And a protective casing (150).

The optical system 110 includes a first lens 111, a second lens 112, and a spacer 113 interposed therebetween. The first lens 111 has positive curvatures on both sides And a first surface which is an incident surface through which light is incident may be a meniscus lens whose curvature is smaller than a second surface on the opposite side which is an exit surface through which light is emitted.

The second lens 112 may be formed of a concave lens having a negative first curvature facing the first lens and a second curvature having a positive curvature.

Here, the first lens 111 and the second lens 112 may have a linear expansion coefficient of 8.45 10 ^-5 / ° C or less and a refractive index change amount of 1.7 × 10 ^-7 or less depending on temperature. For example, , And PMMA .

Further, the radius of curvature of the first surface of the first lens 111 may be 1.188 to 1.231, and the radius of curvature of the second surface may be 3.880 to 4.389.

For example, when the focal distance between the subject iris and the optical system 110 is 180 mm, the radius of curvature of the first surface of the first lens 111 may be 1.188 to 1.208, and the radius of curvature of the second surface may be The radius of curvature of the first surface of the first lens 111 may be 1.211 to 1.231 and the focal length of the first surface of the first lens 111 may be 1.211 to 1.231 when the focal distance between the object iris and the optical reading system 110 is 200 mm, May be 4.368 to 4.389.

The second lens 112 may have a curvature radius of the first surface opposite to the first lens 111 and a radius of curvature of the second surface opposite to the first lens 111, The radius of curvature of the first surface of the second surface may be -0.698 to -0.578, and the radius of curvature of the second surface may be 0.820 to 1.297.

For example, when the focal distance between the subject iris and the optical system 110 is 180 mm, the curvature radius of the first surface of the second lens may be -0.693 to -0.674, and the curvature radius of the second surface may be 1.277 The radius of curvature of the first surface may be -0.599 to -0.578, and the radius of curvature of the second surface may be 0.820 to 0.841 days. In the case where the distance between the subject iris and the optical system 110 is 200 mm, .

A ring-shaped spacer 113 is disposed between the first lens 111 and the second lens 112 to maintain a predetermined distance between the lenses depending on the thickness of the spacer 113.

On the second surface which is the exit surface of the second lens 112, light in the visible light wavelength region passing through the first and second lenses 111 and 112 is blocked during iris imaging of the subject and light of the infrared wavelength band It is possible to arrange the IR pass filter 114 so as to pass the IR pass filter 114 only.

Here, the IR pass filter 140 is illustrated as being laminated with the lens in the lens barrel between the second lens 112 and the image sensing surface of the image sensor, but the present invention is not limited thereto, And is disposed between the lens 111 and the lens hole 122 of the lens barrel or disposed between the first lens 111 and the second lens 112 to block light in the visible light wavelength region and to detect the infrared wavelength It is possible to perform the function of passing only the light of the band.

The lens barrel 120 is formed of a hollow cylindrical member in which optical systems 110 including the first and second lenses 111 and 112, the spacer 113 and the IR pass filter 114 are sequentially arranged in the optical axis direction .

The lens barrel 120 passes through a lens hole 122 of a predetermined size to allow light to pass therethrough so as to capture an iris, which is a subject, on a central region of an upper surface of the lens barrel, And a male threaded portion 124 formed so as to be movable in the direction of the rotation.

The lens barrel 120 is screwed with the barrel housing 130. The barrel housing 130 has a cylindrical hollow portion formed on the inner surface thereof with a female screw portion screwed with the male portion 124 of the lens barrel. 1 body 132 and a second body 134 of a rectangular frame shape mounted on the mounting surface of the substrate.

The substrate 140 is attached to the mounting surface on which the second body 134 of the barrel housing 130 to be assembled by being screwed with the lens barrel 120 is mounted, A printed circuit board having an image sensor 142 and a pattern printed on a mounting surface.

In the vicinity of the image sensor 142, at least one illumination source 144 for generating light upon power application is provided.

Accordingly, the illumination provided by the illumination source 144 can acquire a clearer iris image from the image sensor at the time of iris photography, which is a subject, and the illumination source can be made of an LED.

The protective casing 150 penetrates through a first exposure hole 152 through which light passes in correspondence with the lens hole 122 formed in the lens barrel 120 and transmits light generated from the light source 144 A box structure on the substantially rectangular parallelepiped having a lower portion corresponding to the substrate 140 and formed through the second exposure hole 154 so as to be irradiated to the subject side.

The protective casing 150 is fixedly coupled to a lower surface of the mounting surface of the substrate so as to cover the barrel housing 130 and the illumination source 144 coupled to the lens barrel 120 .

Preferably, the protective casing 150 includes a reflective mirror 153 having a predetermined size so that the iris of the subject can be seen on an outer surface corresponding to the first exposure hole 152.

The reflection mirror 153 is fixed to the mirror mounting hole formed in the central region of the upper surface of the protective casing 150, and has a circular disk-like mirror member formed through the first exposure hole 152 in the center thereof. And a reflective mirror surface having a predetermined thickness coated on the outer surface of the protective casing 150 as a reflective material around the first exposure hole 152. [

Accordingly, the user can visually confirm that the iris, which is the subject, is aligned with the first exposure hole, which is the center of the reflection mirror 152, during the iris photography, Since the lens hole is disposed on the vertical optical axis, it is possible to increase the image acquisition rate and accuracy for iris recognition during iris photography.

In addition, when light emitted from the illumination source 144 is illuminated to the subject side through the second exposure hole 154, the illumination of the user's eyes facing the first exposure hole 152 is accurately reflected, It is possible to further increase the image acquisition rate.

In addition, the inner surface of the second exposure hole 154 is formed in the iris side of the pupil, which is a subject positioned at a focal distance spaced a predetermined distance from the optical system 110, It is preferable that the light guide plate is formed so as to be inclined at a predetermined angle so as to be illuminated.

Accordingly, the iris image of the user is captured by the iris recognition camera module 100 provided in the terminal T, and the acquired iris image is transmitted to the main board of the terminal, It can be utilized.

In addition, the terminal T is provided with a camera module 1 for photographing in addition to the iris recognition camera module 100, and a general image can be taken by the camera module 1.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

110: Optical system
111: first lens
112: second lens
113: spacer
114: IR pass filter
120: lens barrel
130: barrel housing
140: substrate
142: Image sensor
144: Lighting source
150: Protective casing
152: First Exposure Gauge
154: Second Exposure Gauge

Claims

An optical system having a spacer between the first lens and the second lens and having an IR pass filter passing an infrared wavelength band included in light passing through the first and second lenses;
A lens barrel having the optical system built therein;
A substrate provided with an image sensor for acquiring an iris image of light passing through the optical system on a mount surface on which the barrel housing assembled with the lens barrel is mounted and an illumination source for generating light upon power application; And
A second exposure hole through which light passes and a second exposure hole through which light generated from the illumination source is irradiated to the subject is formed to penetrate through the first exposure hole corresponding to the lens hole of the lens barrel, And a protective casing coupled to the iris recognition module.

The method according to claim 1,
Wherein the protective casing is provided with a reflecting mirror having a predetermined size so that the iris of the subject can be seen by the external surface corresponding to the first exposure hole.

The method according to claim 1,
Wherein the second exposure hole is formed so that an inner surface thereof is inclined so as to illuminate the iris of the pupil, which is a subject positioned at a focal distance from the optical system, .

4. The method according to any one of claims 1 to 3,
Wherein the IR pass filter is disposed between the first lens and the lens hole of the lens barrel or disposed between the first lens and the second lens or between the second lens and the image sensor. module.

4. The method according to any one of claims 1 to 3,
Wherein a radius of curvature of the first surface of the first lens facing the lens is 1.188 to 1.208 when the focal length between the optical system and the iris is 180 mm and a curvature of the second surface of the first lens facing the second lens And the radius is 3.880 to 3.991.

4. The method according to any one of claims 1 to 3,
Wherein a radius of curvature of the first surface of the first lens facing the lens is 1.211 to 1.231 when the focal length between the optical system and the iris is 200 mm and a curvature of the second surface of the first lens facing the second lens And the radius is 4.368 to 4.389.

4. The method according to any one of claims 1 to 3,
Wherein a radius of curvature of the first surface of the second lens facing the first lens is -0.693 to -0.674 when the focal length between the optical system and the iris is 180 mm and a radius of curvature of the second surface facing the image sensor Is 1.277 to 1.297.

4. The method according to any one of claims 1 to 3,
Wherein when the focal length between the optical system and the iris is 200 mm, the radius of curvature of the first surface of the second lens facing the first lens is -0.599 to -0.578, and the radius of curvature of the second surface facing the image sensor Is 0.820 to 0.841.