KR100546821B1 - Lighting device of iris recognition device - Google Patents

Abstract

The present invention relates to an illumination device of an iris recognizer, and an object thereof is to obtain a high quality iris image by an infrared light module employing a condenser lens for focusing with a short-wavelength LED of a deep-type on a case of a lattice form. To provide an illumination device of the iris recognizer. It is an iris recognition camera for capturing an iris image, a distance sensor installed at the lower side of the camera and controlling a zoom and focusing of the camera by measuring a distance to a user, and a case partitioned with a grid portion. And an infrared LED inserted into and fixed to the inside of the case, and a condenser lens focusing light emitted from the infrared LED, the infrared optical module being inclined at a predetermined angle to project infrared rays to the iris, and the infrared light. It includes a flat infrared filter that is adopted in the passage of the light emitted from the module.

Camera, Distance Measuring Sensor, Infrared Optical Module, Infrared Filter

Description

Lighting device of iris recognition device

1 is a block diagram showing the configuration of a general iris recognition system.

Figure 2a is a cross-sectional view showing the main configuration of the iris recognition system to which the conventional illumination device is applied.

2b is an enlarged cross-sectional view of the lighting device of FIG. 2a;

Figure 3 schematically shows the overall configuration of the iris recognition device according to the present invention.

Figure 4 is an exploded perspective view showing in detail the infrared optical module of the iris recognition device according to the present invention.

(Explanation of symbols for the main parts of the drawing)

10: camera 20: distance measuring sensor

30: infrared optical module 31: case

32: infrared LED 33: condenser lens

40: infrared filter

The present invention relates to an illumination device of an iris recognizer, and more particularly, a high-quality iris image can be obtained by an infrared light module adopting a condenser lens for focusing with a short-wavelength LED of a deep-type on a lattice-shaped case. It relates to the lighting device of the iris recognizer.

As is generally known, the iris refers to the outer peripheral portion of the human eye (eyeball) than the pupil, and the iris has a peculiar characteristic, and there is a slight difference between each individual, and even in the case of the same person, a slight difference between the left and right irises. It is to put.

Due to the characteristics of the iris, an automatic sensing control device technology using the iris is emerging in the fields of security cards, credit cards, and door locking systems.

1 is a block diagram showing the configuration of a general iris recognition system.

As shown in the drawing, a distance measuring sensor 1 for measuring a distance to a user using an infrared sensor, an external indicator 3 for informing a user whether the system is active and recognized, and irrespective of surrounding brightness Illumination device (4) for adjusting the illuminance at the time of iris image shooting, optical window (5) for positioning the user's eyes, cold mirror passing through the infrared light through the optical window and blocking visible light ( 6), a camera 7 for photographing an iris image of the user transmitted through the cold mirror, a frame grabber 8 for processing the photographed iris image, and the distance measuring sensor 1 The controller 9 determines whether the user is within the operating range by receiving the distance measurement value, automatically recognizes the iris, and adjusts the light intensity, and controls the controller 9. By optical indicators for controlling the operation of the external 3 and the illumination device (4) it is already configured with the low driver (2).

The operation of the general iris recognition device as described above is as follows.

When the user approaches the iris recognition system, the distance measuring sensor 1 measures the distance to the user and transmits it to the control device 9, and the control device 9 determines whether the received distance measurement value is within the operating range. If the determination result is within the operating range, the control signal is output to the optical imager driver 2 to prepare for iris image extraction.

The optical imager driver 2 sends an active signal to the external indicator 3 to inform the user that the system has been activated, and after the user approaches the optical imager driver 2, the camera 7 through the optical window 5. When placing the eye on the optical axis of the), the cold mirror 6 passes the infrared rays and blocks the visible light.

In addition, the cold mirror 6 displays the portion where the iris should be located so that the user can easily check whether or not his eyes are located on the optical axis of the camera 7.

After that, the controller 9 controls the camera 7 to capture the iris image, and when the iris image captured by the camera 7 is provided to the frame grabber 8, the frame grabber 8 ) Processes the signal to fit the image analysis and provides it to the control device 9, and the control device 9 receiving the processed signal is recognized by the external indicator 3 through the optical imager driver 2. The user will be informed whether or not.

In the iris recognition device as described above, the lighting device 4 has a great influence on the recognition rate, and various technologies have been developed for this. As a conventional example of the lighting device of the iris recognition device, a patent publication number is disclosed. It can be found in 2001-0045807, "Illuminator of Iris Recognition System"

2a and 2b is a view showing an example of a lighting device of the iris recognition device according to the prior art, in the following drawings will be described with the original reference numerals.

As shown, a through hole 32 is provided in the center of the front surface of the case 31 constituting the exterior of the iris recognition system, and an infrared filter 35 is installed around the through hole 32, and the case 31 In the inner center of the lens assembly 40 is provided with a plurality of lenses to correspond to the through-hole 32, both sides of the lens assembly 40 is provided with an illumination device 10 for irradiating infrared light.

The lighting device 10 is a holder 12 is installed inside the housing 11 constituting the appearance, the holder 12 is provided with a substrate 14 having an el chip 15 for emitting infrared light In front of the EL chip 12, a filter 18 for diffusing infrared rays with uniform brightness is provided, and a condenser lens 19 is installed in front of the filter 18.

In addition, a stopper 11 ′ is provided on the front surface of the housing 11 to block the ambient light generated by scattering while passing through the condenser lens 19 to the outside.

In addition, the heat dissipation plate 20 for dissipating heat from the el chip 15 to the outside is fastened with screws to the rear surface of the housing 11 to configure the appearance of the lighting device (S).

In the illumination device 10 of the iris recognition device configured as described above, the infrared rays emitted from the EL chip 15 are diffused while passing through the filter 18, so that the overall brightness is equal, and the light passes through the condenser lens 19 again. While the light is collected, ambient light is removed by the stopper 11 ′ and irradiated with a predetermined light distribution angle α °.

In addition, the infrared light emitted from the illumination device 10 passes through the filter 35 installed in the front of the case 31 to form the illumination region A in front of the iris recognition system, the illumination region thus formed When the iris of a person is located, the image is transmitted to the image pickup device (not shown) through the lens assembly 40 to recognize the iris.

However, such an iris recognition device uses a multi-wavelength illumination device to obtain a strong image of noise, and by using such a multi-wavelength iris imager, the iris recognition is generated due to the heat generation problem and the overcurrent with the increase in the purchase price. It has a decisive influence on the reliability of the device.

In other words, when the operating environment of the iris recognition device is operated at an environment of 30 degrees Celsius or more, the accumulated heat due to heat generation and overcurrent in the LED of an El chip type may provide a system shutdown and malfunction. Continued thermal integration without a separate cooler would exceed the typical operating temperature of the component, 80 degrees Celsius.

In addition, malfunctions due to overcurrent may proceed even under such environmental temperatures. If the system initialization is repeated due to the cause of the malfunction, the recognition time may be unacceptably long. The present invention is to solve this problem, and to obtain an image robust to noise.

 SUMMARY OF THE INVENTION The present invention has been made to solve this conventional problem, and its object is to obtain a high quality iris image by an infrared optical module adopting a condenser lens for focusing with a dip-type short wavelength LED on a lattice-shaped case. To provide an illumination device of the iris recognizer.

The present invention for achieving the above object is an iris recognition camera for capturing an iris image, a distance measuring sensor which is installed on the lower side of the camera, and controls the zoom and focusing of the camera by measuring the distance to the user; It consists of a case divided into a lattice-shaped space, an infrared LED inserted into and fixed to the inside of the case, and a condenser lens focusing the light emitted from the infrared LED, which is installed at an angle to project the infrared rays to the iris. It includes an infrared optical module, and a flat infrared filter which is adopted in a passage through which the light emitted from the infrared optical module passes.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 is a view showing the iris recognition device according to the present invention.

As shown in the drawing, the iris recognition device includes a camera 10, a distance sensor 20, an infrared light module 30, an infrared filter 40, and an optical axis correction means 50.

The camera 10 is for iris recognition for capturing an iris image, a plurality of lenses (not shown) are provided therein, and an imaging device (not shown) for capturing an image acquired through the lens is included. have.

The distance measuring sensor 20 is installed under the camera 10 and measures the distance to the user to control zooming and focusing of the camera 10.

The distance value measured by the distance measuring sensor 20 is made to compare and determine in a separate control device (not shown) to indicate the output.

The infrared light module 30 corresponds to an illumination device that is installed at an angle to the user's iris image to be inclined at a predetermined angle and projects infrared rays to the iris. Infrared LED 32 is inserted into and fixed to the inside, and the focusing lens 33 for focusing the light emitted from the infrared LED (32).

In addition, the case 31 is partitioned in a grid shape to prevent scattering and interference of light emitted from the infrared LED 32.

In addition, the infrared LED 32 is preferably made of a short wavelength of the dip type.

The infrared filter 40 is adopted in a passage through which the light emitted from the infrared optical module 30 passes, and is formed in a flat plate shape so that the processability is excellent.

Referring to the operation according to the invention in detail as follows.

First, when the user places the eyeball (iris) in front of the camera 10, the infrared LED 32 emits light in the infrared optical module 30 to irradiate light, and at this time, the case 31 of the infrared optical module 30. ) Is a lattice to prevent light from scattering and interference.

In addition, in the above state, the light is irradiated toward the infrared filter 40 without the light attenuation through the condenser lens 33 installed in front of the case 31, the light passing through the infrared filter 40 is the user's It is irradiated to the eye to obtain a clear image.

In this state, the distance measuring sensor 20 measures the position of the user's iris to control zooming and focusing of the camera 10 through the control unit.

As described above, the illumination device of the iris recognizer according to the present invention adopts a focusing lens for focusing with a short-wavelength LED of a deep type to obtain a high quality iris image.

Claims (2)

An iris recognition camera 10 for photographing an iris image; A distance measuring sensor 20 installed below the camera 10 and controlling a zoom and focusing of the camera 10 by measuring a distance to a user; A case 31 having a space-part partitioned in a lattice shape, an infrared LED 32 inserted into and fixed to the inside of the case 31, and a condensing lens 33 for focusing light emitted from the infrared LED 32. Infrared optical module 30 is made to be inclined at a predetermined angle to project infrared rays to the iris; Illumination device of the iris recognizer comprising an infrared filter (40) of the plate type is adopted in the passage through which the light emitted from the infrared light module (30) passes. The method of claim 1, The infrared LED 32 is an illumination device of the iris recognizer, characterized in that consisting of a short wavelength of the dip type.

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