JPH0715523Y2 - Fingerprint capture device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fingerprint photographing device used for fingerprint detection in the field of identification technology.

[0002]

2. Description of the Related Art The current fingerprint detection technology includes a solid-state method in which a fine powder such as aluminum is physically adsorbed to a fingerprint component to utilize a color difference between an object and powder, an amino acid contained in the fingerprint component, an inorganic ion. There is a liquid method in which a chemical is reacted with the above to give a color, and a gas method in which a fat content in a fingerprint component is caused to react with an iodine gas to give a color.

As another method of the gas method,
A method of fixing the fingerprint ridges with a cyanoacrylate gas as shown in International Publication No. W085 / 00963 and further whitening the fingerprint ridges has been introduced worldwide. For example, the inventors of the present invention have made a practical use of this technology.
A vaporization-type fingerprint detection device provided with a cyanoacrylate vaporization container and a heater thereof as shown in JP-A-174903 and JP-A-2-45713 was devised.

The fingerprint revealed by the cyanoacrylate gas method is photographed for preservation of evidence, but if the fingerprint is clear and the ridge has progressed to white, it can be photographed easily even under indoor lighting. However, most of the fingerprints revealed at the crime scene cannot be easily visually observed although the cyanoacrylate and the fingerprint component are fixed and fixed. Therefore, it is very difficult to search or take a picture of these fingerprints, so that you can observe the fingerprints through the viewfinder of the camera by irradiating white light with a light from an oblique direction and shadowing the fingerprint ridges. However, since the writing work requires a lot of time and labor, it has been desired to develop a device that can easily retrieve an unclear fingerprint or take a photograph.

On the other hand, the lamp type fluorescence method is one of the most popular optical fingerprint detecting methods. For example, as disclosed in Japanese Patent Laid-Open No. 63-301369, only light in a wavelength range necessary for exciting a fingerprint component out of white light emitted from a light source is extracted as a sample by using a special optical filter. A lamp-type fluorescence method in which irradiation is performed and fluorescence emitted from a fingerprint component at that time is detected as a fingerprint image has become common. As this technique fingerprint detection technique, for example, Japanese Patent Laid-Open No. 63-298484 and Japanese Patent Laid-Open No. 03-54683.
Although devices such as those disclosed in Japanese Patent Laid-Open Publication No. 2003-242242 have been proposed, these devices need to convert the detected fingerprint image into an electric signal and connect it to an image processing device or the like. Therefore, to take a photograph of the detected fingerprint, it is necessary to darken the whole room and fix the still camera with a tripod or the like. In addition, in order to search for those fingerprints in the pre-photographing stage, not only the light source but also the image receiving part must be moved, which makes work easier and requires more time. Development of a device capable of photographing has been desired.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention simply retrieves a fingerprint detected by utilizing the fluorescence from the fingerprint component or the difference in reflectance or absorptance on the surface of the sample, or A fingerprint photographing device capable of photographing a photograph is provided.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems by irradiating a specimen containing a latent fingerprint with light from a light source and exciting the fingerprint component by the light. It was applied to a fingerprint photographing device for photographing a fingerprint by utilizing the difference in reflectance or absorption of light on the surface of a sample, and the following technical means were adopted. That is, (a) a semi-cylindrical detection head that has an opening for imaging the sample in the center of the upper part and covers the entire sample to block the sample from outside light; and (a) a member for fixing the imaging device, which is arranged above the detection head. (C) A plurality of light emitting adapters that allow the tip of the optical fiber that transmits the light from the light source to be detachable and have a filter of a specified wavelength that can be attached to and detached from the detection head, and the circumference of the detection head on both sides of the fixing member The fingerprint photographing apparatus is characterized in that it is provided with a light projecting adapter mounted thereon to allow the light irradiation angle of the sample of the light projecting adapter to be variable, and also comprises a slit provided with a light shielding means.

[0008]

As described above, most of the fingerprints fixed by cyanoacrylate gas treatment at the crime scene cannot be easily seen, and the fingerprint ridges are illuminated by shining light from the diagonal for the purpose of taking a picture of those fingerprints. Since the work of casting shadows is performed, it takes a lot of time and effort.

On the other hand, in order to take a photograph of a fingerprint detected by the fluorescence method, it is necessary to darken the whole room and fix the still camera with a tripod or the like, which is time-consuming. Also,
In order to search for those fingerprints prior to taking a photograph, not only the light source but also the image receiving section must be moved, so there is a problem in that work efficiency is poor. Since the present invention is configured as described above, a It is not necessary to darken the entire room each time a photo is taken unlike the prior art, the camera can be easily attached, and the tip of the optical fiber can be attached to and detached from the light emitting adapter. Since the irradiation angle of light can be freely changed, it is possible to take a picture of an unclear fingerprint that is difficult to observe visually with a simple operation and in a short time, which can greatly improve the operability of the fingerprint photographing device. Became.

B Since the projection adapter equipped with a filter of a predetermined wavelength can be freely attached to and detached from the detection head, it is possible to easily and efficiently retrieve fingerprints from a wide range before taking a picture.

[0011]

1 (a) is a perspective view showing the overall construction of an embodiment of the device of the present invention, and FIG. 1 (b) is a perspective view of a light source 15. The apparatus according to the embodiment includes a detection head 1 for detecting a fingerprint by blocking external light and irradiating oblique rays, and a filter for extracting light in a required wavelength range from light guided from the light source 15. The projection adapter 2 and the L-shaped angle 6 for fixing the still camera 10 for taking a picture are included.

The detection head 1 has a structure shown in FIGS.
As shown in FIG. 3, the light projecting adapter 2 is inserted from two directions, and the optical filter 13 can extract the light in the required wavelength range from the light guided from the light source 15. The light emitted from the light source 15 is guided by the optical fiber 12, and the tip of the optical fiber 12 is inserted into the optical fiber insertion port 14 of the light projecting adapter 2 as shown in FIG. The tip of 12 is fixed to the light emitting adapter 2 with a fixing screw 2a.

As shown in FIG. 2, two light emitting adapters 2 are provided.
Can be attached to the folder 3 and integrated with the folder 3 by the fixing screw 3a to independently move within the range of the slit 5, and the sample can be irradiated with light at an arbitrary angle.
The slit 5 is provided with an elastic film so as to block outside light from a place other than the inserted light projecting adapter 2.

As described above, the fingerprint fixed by the cyanoacrylate gas treatment can be observed by irradiating light of a certain wavelength obliquely and casting a shadow. When the angle of the light projecting adapter 2 is changed while observing the sample through the opening 7 before mounting the camera, a fingerprint treated with cyanoacrylate gas appears at a certain angle. Fixed irradiation angle fixing screw 4
The detection head 1 is clamped by the lower surface of the fixing screw 4 and the locking piece 3b provided at the lower end of the folder 3. As a result, the irradiation angle of the light emitting adapter 2 is properly maintained,
As shown in FIG. 2, a fingerprint image is formed on the film surface 11 of the still camera 10. However, the angle of the light projecting adapter 2 is not constant because it is influenced by the surface condition of the sample, the cyanoacrylate gas treatment time, and the like. In this embodiment, since the irradiation angle can be freely selected from two directions, it is possible to block external light and detect a clear fingerprint.

If the sample has a very bright color,
In some cases, it may be desirable to irradiate light of a color that is the complementary color. In such a case, it may be replaced with a light projecting adapter 2 having an optical filter 13 that transmits light in an appropriate wavelength range among a plurality of types of optical filters. Next, in order to take a photograph of the detected fingerprint, it is assembled as shown in FIG.
Attach the L-shaped angle 6 to the detection head 1 and the angle fixing screw 9
Then, the still camera 10 is fixed to the L-shaped angle 6 downward with the camera fixing screw 8 to take a picture. No special operation is required for the photo-taking work.

On the other hand, if the light projecting adapter 2 having the optical filter 13 that transmits the light of the wavelength that excites the fingerprint component is used, the fluorescence emitted from the fingerprint can be seen. In this case, the stronger the luminous flux density of the irradiation light, the stronger the fluorescence obtained. Therefore, it is desirable to observe the light projecting adapter 2 in the most raised state (a state close to vertical). In order to observe the fluorescence emitted from the fingerprint component, a light-receiving side filter that does not pass the excitation light but transmits only the fluorescence is required.

To photograph a fingerprint detected by the fluorescence method, this light-receiving side filter is set in front of the lens of the still camera 10, and the photograph is taken in the same operation procedure as the above-mentioned fingerprint photograph photographing. Whether observing a fingerprint with the light emitting adapter 2 for taking a photograph or observing a fingerprint with a fluorescence method for taking a photograph,
There is a need to find whether there is a fingerprint in advance anywhere. In such a case, the light emitting adapter 2 is connected to the detection head 1
It is possible to retrieve a wide range of places such as walls and furniture by inserting the tip of the optical fiber 12 taken out from the wall.

As described above, it is possible to detect a clear fingerprint by irradiating light from a plurality of directions at an arbitrary angle and to easily take a photograph.

[0019]

By taking a photograph of a fingerprint with the device of the present invention, the following excellent effects are obtained. (A) Even a fingerprint that is difficult to visually observe can be photographed easily and in a short time by irradiating light from a plurality of directions at arbitrary angles, improving operability and improving work efficiency. To do. (B) Since the detection head has a structure that blocks external light, it is possible to eliminate a factor that adversely affects shooting, such as light from a fluorescent lamp. (C) When searching for fingerprints before taking a picture, prepare several kinds of optical filters according to the purpose of the work, and by replacing the optical filters, you can easily search for fingerprints from a wide range. And can be done efficiently.

The present invention is not limited to the above-described specific embodiment, and it goes without saying that various modifications can be made within the technical scope of the present invention.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 (a) is a perspective view showing a whole structure, and FIG. 1 (b) is a perspective view of a light source 15.

FIG. 2 is an explanatory view of the operation of the present invention.

FIG. 3 is an explanatory view of a light emitting adapter of the present invention.
3A is a vertical sectional view, and FIG. 3B is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Detection Head 2 Emitter Adapter 3 Folder 4 Fixing Screw 5 Slit 6 L-shaped Angle 7 Opening 8 Fixing Screw 9 Fixing Screw 10 Camera 11 Film Surface 12 Optical Fiber 13 Filter 14 Insertion Port 15 Light Source

Claims (1)

[Scope of utility model registration request] 1. A fingerprint is photographed by irradiating a specimen containing a latent fingerprint with light from a light source, and utilizing the amount of fluorescence excited by the fingerprint component by the light or the difference in reflectance or absorption of light on the specimen surface. In a fingerprint image pickup device, a semi-cylindrical detection head that covers the entire specimen and shields the specimen from external light by providing a specimen photographing opening in the center of the upper part, and for fixing the photographing device arranged above the detection head A member, a plurality of light projecting adapters that can detachably attach the tip of an optical fiber that transmits light from a light source and that is equipped with a filter of a predetermined wavelength and that can be attached to and detached from the detection head; A fingerprint photographing apparatus, which is provided on the circumference of a detection head, is equipped with the light projecting adapter, is configured to change a light irradiation angle of the light projecting adapter to a sample, and is composed of a slit having a light shielding means.