JPH0194488A - Rugged pattern input device - Google Patents

Abstract

PURPOSE:To make the title device compact and to lower its costs by using an adhesive type image sensor in order to convert uneven optical pattern information into an electric signal. CONSTITUTION:A parallel beam flux 2 emitted from a light source 1 is made incident on a prism at an angle in a prescribed range, and for example, a finger 4 to be detected object is pushed onto a reflective surface 3a of the prism 3. An outgoing light 5 from the prism 3 becomes a contrast image corresponding to the striped pattern of a finger print 4a, light pattern information is obtained, inputted to a 2-dimensional adhesive type image sensor 6, converted into the electric signal, and inputted to a processor 10 as an output signal 9. The adhesive type image sensor 6 is operated so that uneven picture data may be image- formed and converted into the electric signal as the optical information of the rugged pattern at directly approximate position, and it has a small and thin shape. Thus, the small and inexpensive input device can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention belongs to the field of pattern recognition technology, for example, uneven pattern input for optically extracting minute patterns of uneven patterns in fingerprint discrimination, seal verification, etc. It is related to the device.

[Conventional technology]

FIG. 4 is a block diagram showing a conventional uneven pattern input device disclosed in, for example, Japanese Unexamined Patent Publication No. 55-13446. In the figure, 2 is a parallel light beam emitted from a light source, 3
3 is a prism as an optical device arranged at an angle within a predetermined range with respect to the parallel light beam 2, 3a is a reflective surface of the prism 30, 4 is a finger as a detected object placed on the reflective surface 3aK of the prism 3, and 4a is a fingertip 5 is the emitted light from the prism 3, 41 is a camera lens, 42 is a television camera, 43
is the output signal from the chimp camera 42, and 44 is the output signal 4
This is the No. 3 processing device.

Next, the operation will be explained. First, a bundle of parallel light rays 2 is made incident on the prism 3 at an angle within a predetermined range. Here, when the finger 4, which is the object to be detected, is pressed against the reflective surface 3a of the prism 3, in the non-contact part where the striped pattern of the fingerprint 4a is formed,
Total reflection occurs due to the refractive index of glass and air, which are the materials of the prism 3, and no total reflection occurs at the contact portion due to the mutual refractive index relationship between the medium, that is, the finger 4 and the prism 3. Therefore, a contrast image corresponding to the fingerprint 4a is obtained as optical pattern information. Next, when this light pattern information, emitted light 5 from the prism 3, is input to the television camera 42 through the camera lens 41, the television camera 42 converts this light pattern information into an electrical signal 43, This electrical signal is input to the processing device 44.

[Problem that the invention seeks to solve]

Since the conventional uneven pattern input device is configured as described above, it is necessary to use the television camera 42 to extract the uneven pattern as optical pattern information, and the distance from the reflective surface 3a of the prism 3 to the television camera is There were problems such as it was necessary to ensure a sufficient amount of space, and there was a limit to the ability of the entire device to be made into a 7-8 type.

This invention was made to solve the above-mentioned problems, and aims to obtain a small and inexpensive uneven pattern input device by using a contact type image sensor instead of a television camera. Means for Solving the Problems] The concave-convex pattern input device according to the present invention provides image information of the detected object obtained by contact or non-contact between the optical device into which the light beam is incident and the concave-convex surface of the detected object. is configured to be converted into an electrical signal by a contact type image sensor as a signal conversion element.

[For production]

The contact image sensor of the present invention converts uneven image data from an optical device such as a prism into optical information of an uneven pattern at a position directly adjacent to the optical device, without intervening an optical system such as a lens. Acts to convert images and electrical signals. This contact image sensor has a small and thin shape. Therefore, the main body shape of the concave-convex pattern input device can be significantly reduced in size compared to the case where a television camera is used, thereby enabling highly accurate input/output of image data and contributing to cost reduction.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a light source composed of a lamp or a light emitting diode, etc., 2 is a parallel beam of light emitted from the light source 1, and 3 is a parallel light beam emitted from the light source 1.
3a is a prism as an optical device arranged at an angle within a predetermined range with respect to the parallel beam 2, and 3a is this prism 3.
4 is a finger as an object to be detected placed on the reflective surface 3a of the prism 3, 4a is a fingerprint as a detection target surface composed of an uneven pattern, 5 is light emitted from the prism 3, and 6 is a light beam. A close-contact image sensor (here, a two-dimensional close-contact image sensor) serves as a signal conversion device that converts the emitted light 5 from the prism 3 having pattern information into an electrical signal, and 7 is a gradient index lens. A two-dimensional refractive index gradient lens array (also referred to as a two-dimensional rod lens 5) arranged two-dimensionally in the form of a toothed surface, and 8 a photoelectric conversion device consisting of an image sensor play consisting of a CCD image sensor, etc., and its control circuit. , 9 is its output signal, and 10 is a processing device.

In addition, in FIG. 2, 3b is the reflective surface 3a of the prism 3.
3c is a non-contact part.

FIG. 3 is a conceptual diagram of the two-dimensional contact type image sensor 6. In the figure, 31 is a captured image obtained from the prism 3, 32 is a CCD image sensor array, and 33 is a CCD control circuit.

Next, the operation will be explained. First, a bundle of parallel light rays 2 emitted from a light source 1 is made to enter a prism 3 at an angle within a predetermined range. FIG. 2 shows details of the contact portion between the prism 3 and the fingerprint 4a, and here, the reflective surface 3a of the prism 3
A finger 4, which is an object to be detected, is pressed against the object. Then, fingerprint 4a
In the non-contact part 3c forming a striped pattern, parallel light rays are totally reflected due to the refractive index of glass and air, which are the materials of the prism 3, and in the contact part 3b, the medium, that is, the finger 4 and the prism 3
Diffuse reflection occurs due to the mutual refractive index relationship between the two, and total internal reflection does not occur. Therefore, the emitted light 5 from the prism 3 is the fingerprint 4.
A contrast image corresponding to the striped pattern a and light pattern information of the striped pattern are obtained and input to the two-dimensional contact image sensor 6. In this two-dimensional close-contact image sensor 6, as shown in FIG. image on top.

This image data is converted into a stain signal by the CCD image sensor array 32, outputted as an output signal 9 via the CCD control circuit 33, and inputted to the processing device 10.

In the above embodiment, the case of inputting the concave-convex pattern of the fingerprint 4a has been explained, but it can also be used to detect concave-convex patterns such as stamps and palm prints as the detection target surface, and the same effects as in the above embodiment can be achieved. .

Further, in the above embodiment, the photoelectric conversion device 8 is provided with a CCD image sensor array 32, but as an image sensor, M
An O8 image sensor may be provided, and the same effects as in the above embodiment can be achieved.

Furthermore, in the above embodiment, the beam radiated from the light source 1 is the parallel beam 2; As long as the incident light exceeds The configuration is such that a close-contact image sensor that can be placed close to the imaging screen is installed to perform pattern input and extraction, making it possible to obtain highly accurate uneven pattern image data and making the device more compact and low-speed. There is an effect that you can get what you can 0

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a concavo-convex pattern input device according to an embodiment of the present invention, FIG. 2 is a detailed diagram of a contact portion between a finger, which is an object to be detected, and a prism, and FIG. 3 is a diagram of a two-dimensional contact image sensor. FIG. 4 is a block diagram of a conventional uneven pattern input device. 0 1 is a light source, 3 is an optical device (prism), and 4 is an object to be detected (
finger), 6 is a signal conversion device (contact type image sensor), T
8 is a gradient index lens array, and 8 is a CCD image sensor array. In addition, in the figures, the same reference numerals indicate the same parts or the priest parts.

Claims (3)

[Claims] (1) A light source, an optical device that makes the light beam from the light source enter at an angle within a certain range, and total reflection of the light beam caused by contact or non-contact between the optical device and the uneven surface of the object to be detected. An uneven pattern input device comprising a signal conversion device that converts image information based on non-total reflection into an electrical signal, wherein the signal conversion device is a contact type image sensor. (2) The uneven pattern input device according to claim 1, wherein the contact image sensor is formed from a gradient index lens array and a CCD image sensor array. (3) The concavo-convex pattern input device according to claim 1, characterized in that a gradient index lens array and a CCD image sensor array are two-dimensionally arranged.