JPS63679A - Uneven surface information detector - Google Patents

Abstract

PURPOSE:To simultaneously obtain plural distinct detected images by constituting the titled detector so that plural detected images can be photographed simultaneously by an optical path separating method. CONSTITUTION:A photographing area B on which a reflected light from a finger projecting part is made incident, and a reflected light from a finger recessed part and an illuminating light 7 are not made incident is formed at the side of each emitting surface 11c in a detector 11. In such a state, when a finger 5 is made to abut on the upper face 11a and the illuminating light 7 is radiated from the lower face 11b, each a part 7a of a scattered light reflected by a point P to which a finger projecting part contacts is emitted toward the side from each slanting face 11c, made incident on each image pickup element 8 provided on the inside of the area B, and two sheets of patterns (fingerprint patterns) of the finger projecting part are photographed simultaneously. In such a way, plural sheets of uneven surface information can be photographed simultaneously, therefore, photographing can be executed in a short time.

Description

[Detailed Description of the Invention] [Summary] In the uneven surface information detector that detects fingerprints, etc. of fingers pressed against the sample contact surface, by making it possible to simultaneously display multiple detected images using an optical path separation method. , multiple clear detection images can be obtained simultaneously.

[Industrial application field]

The present invention relates to an uneven surface information detector, and more particularly to improved performance of a fingerprint sensor used in a personal verification system for detecting fingerprints.

BACKGROUND OF THE INVENTION As the information society progresses, various technologies related to maintaining the confidentiality of information processing systems are being developed. For example, when controlling access to a computer room, conventional I
In place of the D-card, personal verification systems are beginning to be introduced in which each individual's fingerprints are registered in advance and verified upon entering the room, but since they are targeted at particularly important equipment, further improvements in performance are desired. Personal verification systems that detect fingerprints are attracting attention as an extremely powerful method.

[Conventional technology]

FIG. 5 is a block diagram showing the main configuration of the personal verification device, and FIG. 6 is a side view schematically showing a conventional uneven surface information detector.

In FIG. 5, the personal verification device that detects fingerprints as personal information is composed of a fingerprint sensor 1, a dictionary 2 for verification of detected information, and a verification circuit 3 for verification of detected information, and a dictionary for verification of information such as cards, etc. 2 stores a fingerprint registered in advance via the fingerprint sensor 1.

In the personal verification device configured as described above, when a fingerprint is input from the fingerprint sensor 1, the information verification circuit 3 compares and verifies the input fingerprint with a registered fingerprint to determine whether the verification person is a registered person. It is determined whether or not.

In FIG. 6, the uneven surface information detector (fingerprint sensor) 4 corresponding to the fingerprint sensor 1 is made of an uneven surface information detection medium made of optical glass formed into a triangular prism shape, and the upper surface 4a of the detection medium 4 is 5, the recess 5 due to fingerprints
A space is created between the finger contact surface 4a and the finger contact surface 4a, and the raised portion 5b formed by the fingerprint is brought into close contact with the hand contact surface 4a.

A light source 6 facing one slope 4b of the detection medium 4 is turned on, and illumination light 7 is irradiated onto the hand contact surface 4a. Then, a part of the illumination light 7 irradiated to the opposing portion of the recess 5a passes through the detection medium 4 and illuminates the recess 5a, and the reflected light illuminates the detection medium 4.
incident on . A part of the illumination light 7 irradiated onto the close contact between the finger contact surface 4a and the convex portion 5b is scattered at the close contact interface.

Therefore, the reflected light 7a from the convex portion 5b enters the concave portion 5a.
When the first image element 8 is arranged in the area where the reflected light from the ↑ and the illumination light 7 do not enter, that is, the diagonally shaded area A located on the same side as the light source 6, the most image element 8 changes the pattern of the convex portion 5b to I. Can be shadowed most.

[Problem that the invention seeks to solve]

The conventional detector 4 takes one photo at a time, and when a CD service such as a bank requires multiple photos to store the original fingerprint, the problem is that the photo has to be taken multiple times. there were.

Note that when attempting to take multiple (for example, two) fingerprint photographs at the same time with a conventional device, a half mirror is disposed between the detector 4 and the imaging element 8 to divide the photographs into a plurality of photographed images. As a result, the photographed image becomes dark and it becomes difficult to take clear photographs. Furthermore, copying a single photograph with the same resolution as the photograph requires a longer time than repeatedly photographing multiple photographs, which is inappropriate.

[Means for solving problems]

According to an embodiment of the present invention, which aims to eliminate the above-mentioned problems, as shown in FIG. A sample abutting surface 11a that contacts the sample abutting surface 11a, an incident surface 11b of the illumination light 7 that illuminates the sample abutting surface 11a from the inside, and a part 7a of the scattered light that the incident illumination light 7 reflects on the sample abutting surface 11a. This is an uneven surface information detector characterized in that it includes a plurality of emission surfaces 11c that emit light, and the emission surfaces 11c are formed around a sample contact surface 11a.

[Effect]

According to the above means, it becomes possible to take a plurality of images with the same brightness as the image emitted from a conventional detector, and it becomes easy to record uneven surface information that requires a plurality of images.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An uneven surface information detector according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view schematically showing an uneven surface information detector according to a first embodiment of the present invention, and FIG. 2 is a perspective view schematically showing an uneven surface information detector according to a second embodiment of the present invention. 3 is a perspective view schematically showing an uneven surface information detector according to a third embodiment of the present invention, and FIG. 4 is a perspective view for explaining an example of use of the uneven surface information detector shown in FIG. 2. FIG.

In FIG. 1, in which the same reference numerals are used for parts common to those in FIG. The finger contact surface (
an illumination light incident surface (lower surface) 11b which faces the upper surface 11a and into which the illumination light 7 from the light source 6 is almost perpendicularly incident;
A pair of uneven information output surfaces (slanted surfaces) 11C are provided on the left and right sides of the upper surface 11a and are inclined downward.

In such a detector 11, a photographing region B is formed on the side of each output surface 11c, in which the reflected light from the finger convex portion enters, and the reflected light from the finger concave portion and the illumination light 7 do not enter.

Therefore, the illumination light 7 is applied to the upper surface 11a by touching the finger 5 to the lower surface 11a.
When irradiated from 1b, each negative part 7a of the scattered light reflected at the point P where the convex part of the finger is in close contact is emitted laterally from each slope 11c, and is emitted to each image sensor 8 disposed inside area B. The pattern of convex portions of the fingers (fingerprint patterns) is photographed at the same time.

In FIG. 2, an uneven surface information detector (fingerprint sensor) 21
is a concave-convex information sensing medium made of optical glass formed into a hexagonal truncated pyramid shape, and has a finger contact surface (top surface) 21 on which the fingers come into contact.
a, an illumination light entrance surface (lower surface) 21b that faces the upper surface 21a and into which the illumination light 7 is incident, and six uneven information output surfaces (slanted surfaces) 21c that slope downward around the upper surface 21a.

The detector 21 has a photographing area (corresponding to area B in FIG. 1) outside each slope 21c, where the reflected light from the convex parts of the fingers enters, and the reflected light from the concave parts of the fingers and the illumination light 7 do not enter.
(not shown) is formed.

Therefore, the illumination light 7 is applied to the upper surface 21a by touching the finger to the lower surface 21a.
When irradiated from point b, each - portion 7a of the scattered light reflected at the point P where the convex part of the finger is in close contact is emitted from each slope 21c toward the side and enters the image pickup device disposed within the photographing area. ,
The pattern of the convex portions of the fingers (fingerprint patterns) is photographed by each of the six image sensors.

In FIG. 3, an uneven surface information detector (fingerprint sensor) 31
is a concave-convex surface information sensing medium made of optical glass formed into a truncated cone shape, and has a finger contact surface (upper surface) 31a on which the finger comes into contact.
, an illumination light incident surface (lower surface) 31b facing the upper surface 31a and into which the illumination light 7 is incident, and a cylindrical uneven information output surface (slope) 31C that slopes downward around the contact surface 31a.

This fingerprint sensor 31 has an infinite number of slopes 21c in FIG. 2, and the outside of the slope 31c corresponds to area B in FIG. A photographing area (not shown) is formed in which the reflected light from the finger recess and the illumination light 7 do not enter.

Therefore, for example, five image sensors are arranged at arbitrary positions within the photographing area, and when a finger is brought into contact with the upper surface 31a, the illumination light 7
When irradiated from the lower surface 31b, the point P where the convex part of the finger comes into close contact with
The scattered light reflected by the surface is emitted from the slope 31c toward each image sensor, and five patterns of convex parts of the fingers (fingerprint patterns) are captured.
You can shoot at the same time.

In FIG. 4, in which parts common to those in FIG. , an image sensor (not shown) containing a photographic film 23 is arranged below them. Then, a portion 7a of the scattered light emitted laterally from each slope 21c is refracted downward by the reflecting mirror 22, and as shown in (b), the part 7a of the scattered light emitted to the side is ↑ of the film 23.
Since each of them is incident on the shadowmost regions 23a to 23f, 1
Six fingerprint images are taken on the film 23.

In addition, in FIG. 4, fingerprints are photographed at six radial locations on the film 23;
By appropriately setting the inclination angle, it is possible to align and photograph, for example, six fingerprint images in two rows of three on one film 23, which can also be detected by an imaging device such as a CCD. I would like to add that.

〔Effect of the invention〕

As described above, according to the present invention, since a plurality of pieces of uneven surface information can be captured at the same time, photographing can be performed in a short time.

[Brief explanation of drawings]

Fig. 1 is a side view schematically showing an uneven surface information detector according to a first embodiment of the present invention, and Fig. 2 is a side view showing an outline of an uneven surface information detector according to a second embodiment of the present invention.

Claims (1)

[Claims] An uneven surface information detection medium made of a material that transmits light is provided on a sample contact surface (11a, 21a, 3) that contacts the uneven surface of the sample.
1a), and an incident surface (11b, 21b, 31b) of the illumination light (7) that illuminates the sample contact surface (11a, 21a, 31a) from the inside.
), and the incident illumination light (7) hits the sample contact surface (11a, 2
A plurality of emission surfaces (11c, 21c, 31c) that respectively emit a part (7a) of the scattered light reflected by 1a, 31a).
) An uneven surface information detector characterized by comprising: