JPH056914B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image input device, and more particularly to an image input device that optically detects a pattern to be verified, such as a fingerprint, and generates an electrical signal.

[Conventional technology]

Systems that use fingerprints to identify individuals have extremely high reliability due to the characteristics of fingerprints, which are ``unique for all people'' and ``unchangeable throughout life.'' Various devices have been proposed for verifying identity with registered fingerprints.

In such a fingerprint verification device, a finger placed on a finger placement surface of a prism is connected to a light source and an ITV using an optical boundary change from the back surface of this placement surface.
It has a fingerprint image input device that generates a photoelectric conversion image of a fingerprint pattern using an imaging device such as an industrial television (Industrial Television).
69300 and Japanese Patent Application Laid-Open No. 54-85600.

FIG. 4A is a plan view showing the arrangement relationship between the prism 1 and the finger 2, which is the object to be inspected, in such an image input device, and FIG. 4B is a side view of FIG. 4A, also showing the optical path. This is what is shown in the diagram. prism 1
has three independent surfaces: a light incidence surface 11, a reflection surface 12 which is a placement surface on which the finger 2 is placed, and a derivation surface 13 from which reflected light from the reflection surface is derived. FIG. 4C shows an example of a fingerprint pattern obtained from the derivation surface 13.

[Problem that the invention seeks to solve]

However, in this case, if no restrictions are placed on the placement of the finger 2, it may rotate in the direction of the long finger on the placement surface as shown in FIG. 5A, or in the direction of the long finger as shown in FIG. 6A. The finger rotates around the axis, and the resulting fingerprint pattern is as shown in Figures 5C and 6C.To compare it with the registered fingerprint pattern in Figure 4C, first This method has the disadvantage that a complicated alignment process between patterns is required.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to make it possible to perform matching processing by simply aligning the collected pattern pattern with the registered pattern pattern under the same placement conditions when the finger is placed multiple times. An object of the present invention is to provide an image input device that does the following.

[Means for solving problems]

The image input device according to the present invention has a prism to be collated on the reflecting surface of a prism that independently has three surfaces: a light incident surface, a reflecting surface that causes reflection of the light that has passed through the incident surface, and a deriving surface that derives the reflected light. In an image input device in which a finger to be inspected having a pattern is placed and a pattern to be compared is input using light from the derivation surface, the finger to be inspected is guided on the reflective surface of the prism. The finger is configured to include a guide along an inner surface and a side surface of at least one of the fingers.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1A and 1B are a side view and a plan view of one embodiment of the present invention, and FIGS. 1A and B correspond to FIGS. 4B and A, and the same parts in both figures are designated by the same reference numerals. It is shown. In this embodiment, in addition to a guide for the finger placed on the placement surface which is the reflective surface 12 of the prism 1, a tunnel-shaped guide 3 with a closed end into which the fingers on both sides of the finger are inserted is provided. There is. Therefore, in this example, rotation in the long finger direction on the mounting surface as shown in FIG. 5A on the reflective surface,
There is almost no rotation of the finger around the long finger direction as shown in FIG. 6A. By doing this, the input fingerprint pattern becomes a pattern that does not include rotation or distortion as shown in FIG. 5C or FIG. be able to.

FIGS. 2A and 2B are side and top views of another embodiment of the invention, which also correspond to FIGS. 4B and A. In this embodiment, three finger-shaped notches are made in the guide 4 made of a thick plate so that the three fingers can be placed on it, and include the finger on both sides or one side of the finger having the matching pattern. Multiple fingers are fixed in the direction of the long finger.

FIGS. 3A and 3B are side and top views of a further embodiment of the invention, which also correspond to FIGS. 4B and A. In this embodiment, a guide 5 is provided which has three semi-cylindrical depressions on which three fingers are placed and a stop plate at the tip thereof, and the pattern input prism has a matching pattern. It is set only for the finger rest part.

As described above, in the embodiments shown in FIGS. 1, 2, and 3, if the user places the finger along the respective placement guides, the patterns of the same finger will have little difference from test to test. Get the pattern.

In addition, in order to stably place the finger that has the verification pattern, it is necessary to provide a guide for placing not only the fingers on both sides or one side but also other fingers. , a flat surface is provided on which the palm is placed, the palm is fixed, and a pattern is input in accordance with the above-mentioned finger placement guide without any restrictions.

〔Effect of the invention〕

According to the present invention, a plurality of fingers including a finger having a verification pattern and fingers on both sides or one side thereof are mounted so as to eliminate parallel movement and rotation of the pattern of the object to be inspected on the mounting surface of the prism. Since the positioning guide is provided, it is possible to perform only a simple positioning process between the sampled pattern and the registered pattern, and then proceed to the matching process.

[Brief explanation of the drawing]

1A and B are a side view and a top view of one embodiment of the present invention, FIGS. 2A and B and FIGS. 3A and B are a side view and a top view of another embodiment of the present invention, 4A, B, and C are plan views, side views, and fingerprint patterns of conventional image input devices; FIGS. 5A, B, and C, and FIGS. 6A, B, and C are installation examples of FIG. 4. FIG. 1 is a plan view, a side view, and a fingerprint pattern of 1... Prism, 2... Finger, 3, 4, 5... Guide, 11... Incident surface, 12... Reflective surface, 13...
...Derivation surface.

Claims (1)

[Claims] 1. An object to be inspected that has a pattern to be compared on the reflective surface of a prism that independently has three surfaces: a light incident surface, a reflective surface that causes reflection of the light that has passed through the incident surface, and a derivation surface that derives the reflected light. In an image input device on which a finger is placed and a pattern to be compared is input using light from the derivation surface, in addition to guiding the finger to be inspected on the reflective surface of the prism, at least one side of the finger is provided. An image input device characterized by having a guide along an inner surface and a side surface of each finger.