JP2006326176A - Fingerprint collating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fingerprint collating apparatus which prevents dust from being accumulated on a light receiving part of an imaging means, and hardly causes adhesion of soil. <P>SOLUTION: This fingerprint collating apparatus includes a subject holding part 3 which can hold a subject 2 with a fingerprint 2A in a non-contact state with the surface of the fingerprint, a light source 5 which is provided below the subject holding part 3, and applies a light capable of being transmitted through the subject 2, the imaging means 6 which is provided above the subject holding part 3, takes an image of the light transmitted through the fingerprint 2A of the subject 2, and obtains a fingerprint image corresponding to the fingerprint, and a signal processing part 7 which obtains fingerprint information by processing a fingerprint image outputted from the imaging means 6, and collates the fingerprint information with the fingerprint information stored in advance. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fingerprint collation device, and more particularly to a fingerprint collation device capable of preventing deterioration of collation performance due to dust, dust or dirt.

6A and 6B show a conventional fingerprint collation apparatus. FIG. 6A is a schematic diagram for explaining the function and the overall configuration, and FIG. 6B is a schematic perspective view showing a specific structure.
As shown in these drawings, a subject holding portion 3 for holding a fingertip 2 as a subject is provided on the upper surface of the lower arm portion 1B of the verification apparatus main body 1 formed in a substantially U shape.

  The subject holding part 3 is composed of a projecting part formed in a substantially U shape, and when the fingertip 2 is placed on the upper surface thereof, the surface of the fingerprint 2A and the subject holding part 3 are not in contact with each other. Have been able to hold.

  In addition, a light source 5 that irradiates light that can pass through the fingertip 2 downward as shown by an arrow 4 is installed in the upper arm 1A. The light source 5 is constituted by a laser, a light emitting diode, a lamp light source, or the like, and emits light in the red light or near infrared light region.

An imaging means 6 is provided in the lower arm portion 1B of the verification apparatus main body 1 at a portion located below the subject holding unit 3 so as to capture light from the light source 5 that has passed through the fingertip 2. Yes.
The imaging means 6 includes an imaging lens 61, an imaging element 62, and an image output circuit 63.

  The fingerprint image output from the image output circuit 63 of the imaging means 6 is input to the signal processing unit 7 to obtain the fingerprint information by image processing, and is collated with the fingerprint information as the reference information stored in advance. Have been identified. (For example, refer to Patent Document 1). 8A and 8B are lamps that display whether the collation result is OK or NG.

JP 2003-85538 A

  The conventional fingerprint collation apparatus is configured as described above, and the imaging unit 6 is installed below and receives light emitted from the upper light source 5. There is a problem that the fingerprint image is affected by accumulation of dust or dust or dirt, and the collation performance is deteriorated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fingerprint collation apparatus in which dust and dust do not accumulate in an image pickup unit or a light receiving unit of an image pickup unit, and dirt is not easily attached. And

  The fingerprint collation apparatus according to the present invention includes a subject holding unit that can hold a subject having a fingerprint in contact with the surface of the fingerprint, and light that is installed below the subject holding unit and can pass through the subject. A light source that irradiates the object, an imaging unit that is installed above the subject holding unit, captures the light transmitted through the fingerprint of the subject, and obtains a fingerprint image corresponding to the fingerprint, and is output from the imaging unit A fingerprint image is obtained by processing a fingerprint image, and a signal processing unit that collates this fingerprint information with previously stored fingerprint information.

  The fingerprint collation device according to the present invention is configured as described above, and the light receiving unit of the imaging unit is positioned on the lower surface so that the light emitted from the lower light source is received by the lower surface of the imaging unit. No dirt or dust accumulates on the surface, and dirt is less likely to adhere.

  In this case, the light receiving unit of the imaging unit is positioned on the side surface, and the light emitted from the light source provided on the side surface opposite to the imaging unit of the subject holding unit is received by the side surface of the imaging unit. In addition, the same effect as described above can be expected.

  Furthermore, even when the positional relationship between the light source and the image pickup means is arranged in the same manner as the conventional apparatus shown in FIG. 6, a cover that covers the outer surface of the image pickup means is provided, or a slide-type cover is provided on the upper surface of the image pickup unit of the image pickup means. In this case, a sufficient effect can be expected.

  Furthermore, by providing a blowing unit in the imaging unit and blowing to the imaging unit at all times or immediately before obtaining a fingerprint image, dust and dust can be removed, so that deterioration of matching performance can be prevented. .

  In addition, the above-mentioned means do not completely remove dust and dust from the image pickup unit, and if dirt is detected in the imaged fingerprint information, an alarm to that effect is issued. It becomes easy to do.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. 1A and 1B show the configuration of the first embodiment, where FIG. 1A is a block diagram showing a schematic configuration, FIG. 1B is a schematic perspective view showing an example of the specific structure, and FIG. It is a schematic perspective view which shows another example. In these drawings, the same or corresponding parts as those in FIG.

  As shown in FIG. 1A, the first embodiment is characterized in that the light source 5 is installed below the subject holding unit 3 and the imaging means 6 is installed above the subject holding unit 3. With such an arrangement, the light receiving portion of the imaging means 6 is positioned on the lower surface of the imaging means, so that dust and dust are less likely to collect and dirt is less likely to adhere.

  FIG. 1B shows the specific structure. Although the subject holding unit 3 is omitted, a configuration similar to that in FIG. 6 is provided on the lower surface of the upper arm 1A, and the fingertip 2 is oriented so that the fingerprint 2A corresponds to the subject holding unit. Inserted.

  By adopting such a configuration, dust and dust are less likely to collect in the light receiving unit of the imaging unit 6, and deterioration of collation performance can be prevented.

  FIG. 1C shows another example of the first embodiment. The configuration of FIG. 1B is rotated as it is by about 90 degrees, and the light from the light source 5 is sent to the side of the subject holding unit. In the figure, irradiation is performed from the right side, and imaging is performed by the imaging unit 6 on the side opposite to the subject holding unit, and on the left side in the figure.

The fingertip 2 is inserted sideways so that the fingerprint 2 </ b> A corresponds to a subject holding portion (not shown) provided on the inner surface of the left arm 1 </ b> A of the verification apparatus body 1.
Also in this case, since the light receiving part of the imaging means 6 is located on the side surface, dust and dust are less likely to collect and dirt is less likely to adhere.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a schematic perspective view showing an example of a specific structure of the second embodiment. In this figure, the same or corresponding parts as in FIG.

  In this figure, as in FIG. 1B, the light source 5 is provided in the lower arm portion 1B of the verification apparatus body 1 and the imaging means 6 is provided in the upper arm portion 1A. 5 may be provided in the upper arm 1A, and the imaging means 6 may be provided in the lower arm 1B.

  The feature of the second embodiment is that a cover that covers the outer surface of the image pickup section of the image pickup means 6 is provided on the verification apparatus main body 1. Specifically, side covers 9A and 9B are provided on both sides of the verification apparatus main body 1, and the cover 10A is slidable in the vertical direction on the end surface of the upper arm 1A and the end surface of the lower arm 1B that form the insertion portion of the fingertip 2, respectively. 10B.

  Covers 10A and 10B are formed, for example, with groove portions 11A and 11B as illustrated in the respective end surfaces of the upper arm portion 1A and the lower arm portion 1B, and are slid up and down in the groove portions. When the fingertip 2 is not inserted, The upper and lower covers 10A and 10B are slid to close the fingertip insertion portion, and when the fingertip 2 is inserted, the fingertip insertion portion is opened to form an opening.

  If the cover is provided in this manner so as to cover the outer surface of the imaging unit of the imaging unit 6, the imaging unit 6 is provided to the light receiving unit regardless of whether the imaging unit 6 is provided on the upper arm 1A or the lower arm 1B. It is possible to effectively prevent the accumulation of dust and dust and to prevent the adhesion of dirt.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a schematic diagram showing the configuration of the third embodiment, which is particularly effective when the imaging means is provided on the lower arm 1B. That is, for example, a groove portion 12 is formed on the upper surface of the light receiving portion of the imaging means 6, and a slidable cover 13 is inserted into the groove portion 12 and attached.

The cover 13 is removed at the time of imaging, and the cover 13 is attached again at the end of imaging.
By adopting such a configuration, dust and dust accumulate on the upper surface of the cover 13, so that the cover 13 is removed and discarded in a state where the dirt becomes severe, and is replaced with a new cover.
As a result, it is possible to prevent the light receiving portion of the imaging means from being soiled.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a schematic diagram showing the configuration of the fourth embodiment, which is particularly effective when the imaging means is provided on the lower arm 1B. That is, the air blowing means 14 is provided in the vicinity of the light receiving portion on the upper surface of the image pickup means 6, and the air is blown toward the image pickup portion as indicated by the arrow 15 at all times or immediately before obtaining the fingerprint image, and is collected in the image pickup portion or the light receiving portion. Blows away dust and dirt.

  With such a configuration, even if dust or dust accumulates in the imaging unit or the light receiving unit, it can be effectively removed.

Embodiment 5. FIG.
Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a flowchart for explaining the operation of the fifth embodiment. That is, in the fifth embodiment, after the fingerprint image is acquired by the imaging unit 6 in step S1, it is checked in step S2 whether or not it matches the reference fingerprint image stored in advance in the signal processing unit 7, and the imaging unit 6 is checked. When the fingerprint image captured due to dust or dust accumulated in the image capturing unit or the light receiving unit is dirty and does not match the reference fingerprint image, the warning light is turned on in step S3 to warn of contamination of the imaging unit. It is what you do. If it matches with the reference fingerprint image in step S2, it is considered that there is no dirt on the image pickup unit or the light receiving unit, so the process proceeds to the collation process without warning.

  By adopting such a configuration, even when the imaging unit or the light receiving unit of the imaging unit is contaminated by the above-described first to fourth embodiments, this state is detected and dealt with appropriately. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of Embodiment 1 of this invention, (a) is a block diagram which shows schematic structure, (b) is a schematic perspective view which shows the example of the specific structure, (c) is other than a specific structure It is a schematic perspective view which shows the example of. It is a schematic perspective view which shows the example of the specific structure of Embodiment 2 of this invention. It is the schematic which shows the structure of Embodiment 3 of this invention. It is the schematic which shows the structure of Embodiment 4 of this invention. It is a flowchart for demonstrating operation | movement of Embodiment 5 of this invention. It is a figure which shows the conventional fingerprint collation apparatus, (a) is the schematic for demonstrating a function and the whole structure, (b) is a schematic perspective view which shows a specific structure.

Explanation of symbols

1 verification device body, 2 fingertips, 2A fingerprint, 3 subject holding part, 5 light source,
6 imaging means, 7 signal processing unit, 61 imaging lens, 62 imaging device,
63 Image output circuit.

Claims (7)

  An object holding unit capable of holding an object having a fingerprint in contact with the surface of the fingerprint; a light source that is installed below the object holding part and that emits light that can pass through the object; and the object An imaging unit that is installed above the holding unit and captures the light transmitted through the fingerprint of the subject, obtains a fingerprint image corresponding to the fingerprint, and processes the fingerprint image output from the imaging unit to obtain fingerprint information. A fingerprint collation apparatus comprising a signal processing unit that obtains and collates this fingerprint information with previously stored fingerprint information.   A subject holding unit capable of holding a subject having a fingerprint in contact with the surface of the fingerprint; a light source installed on a side of the subject holding unit for irradiating light that can pass through the subject; and the subject An imaging unit that is installed on a side opposite to the light source of the specimen holding unit, images the light transmitted through the fingerprint of the subject, and obtains a fingerprint image corresponding to the fingerprint, and is output from the imaging unit A fingerprint collation apparatus comprising a signal processing unit that processes fingerprint images to obtain fingerprint information and collates the fingerprint information with previously stored fingerprint information.   A subject holding unit capable of holding a subject having a fingerprint in contact with the surface of the fingerprint; a light source that is installed above the subject holding unit and that emits light that can pass through the subject; and the subject From the imaging unit, the imaging unit is provided below the holding unit, captures the light transmitted through the fingerprint of the subject, obtains a fingerprint image corresponding to the fingerprint, and includes a cover that covers the outer surface of the imaging unit. A fingerprint collation apparatus comprising a signal processing unit that processes the output fingerprint image to obtain fingerprint information and collates the fingerprint information with previously stored fingerprint information.   A subject holding unit capable of holding a subject having a fingerprint in contact with the surface of the fingerprint; a light source that is installed above the subject holding unit and that emits light that can pass through the subject; and the subject An imaging unit that is installed below the holding unit and captures the light transmitted through the fingerprint of the subject to obtain a fingerprint image corresponding to the fingerprint, and has a sliding cover on the upper surface of the imaging unit, and the imaging A fingerprint collation apparatus comprising a signal processing unit that processes fingerprint images output from the means to obtain fingerprint information and collates the fingerprint information with previously stored fingerprint information.   A subject holding unit capable of holding a subject having a fingerprint in contact with the surface of the fingerprint; a light source that is installed above the subject holding unit and that emits light that can pass through the subject; and the subject An imaging unit that is installed below the holding unit, captures the light transmitted through the fingerprint of the subject, obtains a fingerprint image corresponding to the fingerprint, and includes a blowing unit that can blow air to the imaging unit, and the imaging unit A fingerprint collation apparatus provided with a signal processing unit for processing fingerprint images output from the above to obtain fingerprint information and collating the fingerprint information with previously stored fingerprint information.   6. The fingerprint collation apparatus according to claim 5, wherein the blower blows air to the imaging unit immediately before obtaining the fingerprint image.   7. A warning is issued when a smudge of fingerprint information captured by comparing fingerprint information obtained by the imaging means with fingerprint information stored in advance is detected. The fingerprint verification device described in the item.

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