JPH04190470A - Fingerprint input device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fingerprint input device used for fingerprint verification or fingerprint identification.

[Prior Art] In order to actually use fingerprints as a means of identifying individuals, it is desirable to have a simple inkless fingerprint input device that places less psychological and physical burden on the user.

In such a fingerprint input device, it is necessary to obtain an image with a clear contrast between the ridges and valleys of the fingerprint and to ensure a reading accuracy of about 50 μm per pixel to facilitate subsequent processing. It is important for

Conventional fingerprint input devices include those that utilize the emission of laser light from substances contained in skin secretions, and those that utilize reflected light when the finger on which the fingerprint pattern is to be input is brought into contact with a glass surface such as a prism. There are some that take advantage of changes in (
Fingerprint automatic identification technology Masahiro Kawagoe, “Measurement and Control J, vol.
, 25. No, 8. pp, 701-70
6).

In the latter type of fingerprint input device using a prism, the bottom surface of the prism is illuminated by total reflection from the inside, and the light that is totally reflected from the inside of the prism is imaged onto an image sensor by an imaging optical system placed outside the prism. It is configured as follows. That is,
This device utilizes the fact that when a finger is pressed against the outer surface of the bottom of the prism, light is scattered at the convex part of the fingerprint due to contact between the skin and the glass surface of the prism (automatic classification of fingerprint patterns). , Kawagoe, Munekami, "Information Processing Society of Japan Research Report"
, Computer Vision, 18-2.1982).

[Problems to be Solved by the Invention] In the conventional fingerprint input device using a glass surface such as a prism as described above, keystone distortion occurs because the optical path from each point of the fingerprint pattern to the image sensor is different. There is a problem with storing it away.

Furthermore, since the noise light is superimposed by the residual fingerprint of the previous user, there is a problem that the characteristics of the current user's fingerprint pattern cannot be extracted.

Furthermore, since an optical system for forming an image outside the prism is required, there is a problem in that miniaturization is difficult.

In order to solve these problems, there is a method (
A method for detecting fingerprint information using a prism, Shimizu et al., “National Conference of the Institute of Electronics and Communication Engineers J, 1311.1.984),” and a method for detecting fingerprint information using a prism, “2nd ridge pattern of a fingerprint using a hologram to avoid the influence of residual fingerprints.” A device for inputting dimensional image data (a personal verification device using a holographic fingerprint sensor, Igaki et al., “Research Report of the Institute of Electronics, Information and Communication Engineers”, Pattern Recognition and Understanding, 88-38, +988) has been proposed; In this case, the fingerprint pattern is also collected using a contact method, in which the finger on which the fingerprint pattern is to be input is brought into contact with a glass surface, etc., which not only makes it impossible to solve the above-mentioned problems, but also makes it impossible to collect two-dimensional image data. 2 to enter
When using a dimensional image sensor, there is a problem that the device becomes expensive.

Therefore, an object of the present invention is to provide a fingerprint input device that can reliably input a fingerprint pattern without being affected by residual fingerprints and has a simple configuration.

[Means for Solving the Problems] The first invention of the present application includes: an illumination means for illuminating a finger on which a fingerprint pattern is to be input; The roller can be rotated by moving, and the amount of finger movement is measured from the amount of rotation of the roller.
a one-dimensional imaging means that directly receives light from the illumination means reflected by the fingerprint pattern and captures a one-dimensional image in a direction perpendicular to the direction of movement of the finger;
The apparatus further includes a synthesizing means for synthesizing a two-dimensional image of the fingerprint pattern based on the one-dimensional image captured by the dimensional imaging means and the amount of movement of the finger detected by the movement detecting means.

Further, a second invention of the present application includes an illumination means for illuminating a finger on which a fingerprint pattern is to be input, a guide means into which the finger can be inserted,
A movement detection means capable of detecting the amount of movement of the finger inserted inside the guide means, and a movement detection means that directly receives light from the illumination means reflected by the fingerprint pattern to generate a one-dimensional image in a direction perpendicular to the direction of movement of the finger. A one-dimensional image capturing means for capturing an image, and a synthesizing means for synthesizing a two-dimensional image of a fingerprint pattern based on the one-dimensional image captured by the one-dimensional image capturing means and the amount of movement of the finger detected by the movement detecting means. There is.

[Function] In the first invention of the present application, the finger on which a fingerprint pattern is to be input is illuminated by the illumination means, and when the finger touches the roller and moves, the roller rotates, and the movement detection means detects the finger from the amount of rotation of the roller. The amount of movement is detected. ``The light reflected by the fingerprint pattern from the illumination means is directly received by the one-dimensional imaging means, and a one-dimensional image in a direction perpendicular to the direction of movement of the finger is taken. A two-dimensional image of the fingerprint pattern is synthesized by the synthesizing means based on the one-dimensional image captured by the one-dimensional imaging means and the amount of movement of the finger detected by the movement detecting means. It is possible to reliably input a fingerprint pattern without being affected by

Further, in the second invention of the present application, the finger whose fingerprint pattern is to be input is inserted inside the guide means, and the amount of movement of the finger upon insertion is detected by the movement detection means. The inserted finger is illuminated by the illumination means, and the light reflected by the fingerprint pattern from the illumination means is directly received by the one-dimensional imaging means, so that a one-dimensional image in a direction perpendicular to the direction of movement of the finger is taken. . A two-dimensional image of the fingerprint pattern is synthesized by the synthesizing means based on the one-dimensional image captured by the one-dimensional imaging means and the amount of movement of the finger detected by the movement detecting means. It is possible to reliably input a fingerprint pattern without being affected by

[Example code] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing an embodiment of a fingerprint input device according to the first invention of the present application, and FIG. 2 is a plan view of essential parts of the fingerprint input device of FIG. 1.

As shown in FIGS. 1 and 2, the fingerprint input device includes a fingerprint input table 11, a guide plate 12, a roller 13, and a slit 14.
, an illumination device 15, a rotary encoder 16, a cylindrical lens 17, a line image sensor 18, and a synthesis buffer 19.

The fingerprint input table 11 is formed into a flat plate shape so that the fingerprint surface of the finger F can slide and move along the longitudinal direction, and is arranged, for example, horizontally.

The guide plate 12 is formed on the side of the fingerprint input table 11 so that the finger F does not shift in the width direction (X direction in FIG. 2).

The roller 13, the slit 4 and the lighting device 15 are arranged on the fingerprint input stand 11.

The roller 13 is moved in the direction of movement of the finger F (the first
It is configured so that it can rotate when moved along the y-direction shown in FIGS.

The lighting device 15 is configured to illuminate the fingerprint pattern on the slit 14 and to reflect light reflected from the fingerprint pattern directly below through the slit 14.

The roller 13, the slit device 4, and the lighting device 15 are arranged in an X direction perpendicular to the width direction of the finger F, that is, the y direction in which the finger F can move.
Both are arranged along the direction.

The rotary encoder 16 includes the fingerprint input table 11 and the roller 1.
3 and is connected to the synthesis buffer 19. Further, the rotary encoder 16 is configured to be able to detect the amount of rotation of the roller 13.

The cylindrical lens 17 is arranged directly below the slit 14 of the fingerprint input table 11, and is configured to be able to collimate the light reflected from the fingerprint pattern of the finger F. or,
The cylindrical lens 17 is configured to have a deep depth of focus in order to shorten the optical path length and downsize the device.

The line image sensor 18 is disposed further below the cylindrical lens 17 directly below the slit 14 of the fingerprint input table 11, and is connected to the composition buffer 19. Furthermore, the line image sensor 18 is configured to be able to read the reflected light from the fingerprint pattern of the finger F that has been parallelized by the cylindrical lens 17.

The minimum detection amount δ of the rotary encoder 16 and the reading accuracy σ of the line image sensor 18 are 50% per pixel.
The saw is configured to select a diameter of approximately μm.

The synthesis buffer 19 is connected to an identification device (not shown) that identifies the input fingerprint pattern.

The lighting device 15 is an embodiment of the lighting means of the first invention of the present application. The rotary encoder 16 is an embodiment of the movement detection means of the first invention of the present application.

The line image sensor 18 is an embodiment of the one-dimensional imaging means of the first invention of the present application. The synthesis buffer 19 is an embodiment of the synthesis means of the first invention of the present application.

FIG. 3 is a block diagram showing the detailed configuration of the synthesis buffer 19 of FIG. 1, and FIG. 4 is a flowchart for explaining the operation of the fingerprint input device of FIG. 1.

As shown in FIG. 3, the composition buffer 1g includes a line buffer 1'la, a CPU 19b, and an image memory 19.
It is equipped with c.

The line buffer 19a is configured to be able to store one line of one-dimensional image g (X) read by the line image sensor 18 and converted into digital values.

The CPU 19b is configured to be able to perform control according to the flowchart shown in FIG.

The image memory 19c is configured to be able to store a two-dimensional image of the fingerprint pattern of the finger F.

5 and 6 are explanatory diagrams of the operation of the fingerprint input device of FIG. 1.

Next, the operation of the above embodiment, particularly the operation of the CPU 19b, will be explained with reference to FIGS. 4 to 6.

The finger F for which a fingerprint pattern is to be input contacts the fingerprint input table 11 and the roller 13 in the y direction (as shown in FIGS. 1 and 2).
, the roller 13 rotates.

The amount of rotation of the roller 13 at this time is determined by the rotary encoder 1.
6, and the rotary encoder 16 generates a pulse for each minimum detection amount δ and also outputs a rotation direction signal (
code) and outputs it to the synthesis buffer 19.

The line image sensor 18 reads the reflected light from the fingerprint pattern of the finger F that has been parallelized by the cylindrical lens 17, and outputs the read signal serially to the synthesis buffer 19.

First, as shown in FIG. 5, when the finger F contacts the roller 13 and moves from the roller 13 toward the illumination device 15 (in the +y direction), that is, the finger F moves over the slit 14 from the first joint to the second joint. When moving in the direction, the rotary encoder 16 outputs a y-coordinate signal consisting of a pulse for each minimum pressure detection amount δ and a positive (+y) rotation direction signal to the CPU 19b.

The fingerprint pattern of finger F is illuminated by the illumination device 15, and the reflected light from the fingerprint pattern passes through the slit 14, is shaped into parallel light by the cylindrical lens 17, and is read by the line image sensor 18. The data is sequentially stored in the line buffer 192 as one-dimensional image data g(X).

As shown in FIG. 4, when the y-coordinate signal from the rotary encoder 16 is input (step S1), the CPU 19b processes one line of one-dimensional image data g (x) stored in the line buffer 192. Reading step S
2) , synthesize one line of two-dimensional image data G (g (x), y) from one-dimensional image data g (x),
This two-dimensional image data G (g (x), y) is stored in the first line area of the image memory 19c (step S
3).

Thereafter, the counter y indicating the y-coordinate address is incremented (step S4), and the above-described process is repeated until the counter y reaches a predetermined maximum value (maximum movement amount) of the finger F (step S5).

When the counter y counts up, the CPU 19b outputs the two-dimensional image data G(g(x), y) of the image memo January 9C.
) is read out and output to an identification device (not shown).

Therefore, as shown in FIG. 5, when the finger F for which a fingerprint pattern is to be input contacts the roller 13 and moves from the roller 13 to the illumination device 15 (in the +y force direction), each line of the fingerprint pattern of the finger F is The one-dimensional image data g (x) of the finger F is sequentially stored in the line buffer 19a, and the two-dimensional image data G (g(x), y) of the fingerprint pattern is sequentially synthesized from the data corresponding to the tip of the finger F and stored in the image memory 19c. is stored in

Note that the unit in the X direction shown in the line image sensor 18 shown in FIG. be.

Further, as shown in FIG. 6, when the finger F contacts the roller 13 and moves from the lighting device 15 to the roller 13 direction (-y direction), that is, the finger F moves on the slit 14 from the second joint to the second joint. When moving in the direction of one joint, the rotary encoder 16 outputs a y-coordinate signal consisting of a pulse for each minimum detection amount δ and a negative (-y) rotation direction signal to the CPU 19b.

The fingerprint pattern of finger F is illuminated by the illumination device 15, and the reflected light from the fingerprint pattern passes through the slit 14, is shaped into parallel light by the cylindrical lens 17, and is read by the line image sensor 18. The data is sequentially stored in the line buffer 19a as one-dimensional image data g(X). That is, the one-dimensional image data g (x) of the fingerprint pattern of finger F is read from the second joint to the first joint and is stored in the line buffer 1 for each line.
Stored in 9g.

As shown in FIG. 4, when the CPU 19b receives the y-coordinate signal from the rotary encoder 16 (step S1
), 1 line stored in the line buffer 19a
Step S2) to read the dimensional image data g (x)
, one-dimensional image data g (x), two-dimensional image data G (g (x), y) for one line are synthesized, and these two
The dimensional image data G (g (x), y) is stored in the first line area of the image memo January 9C (step S3).

That is, the CPU 19b converts the two-dimensional image data G (g (x ), y) are stored.

Thereafter, the counter y indicating the address of the y coordinate is incremented (step S4), and the above-described process is repeated until the counter y reaches a predetermined maximum value (maximum movement amount) of the finger F (step S5).

When the CPU 19b counts up the counter y, the two-dimensional image data G (g(X),
y) is read and output to an identification device (not shown).

Therefore, as shown in FIG. 6, even when the finger F moves on the slit 14 from the second joint to the first joint, the finger F
Normal two-dimensional image data G (g (
x) and y) are stored in the image memo January 90.

In this embodiment, by securing a large amount of read data, it is possible to improve the fingerprint verification accuracy.

That is, as shown in FIGS. 5 and 6, two-dimensional image data G (g (x) , y) and synthesizes the two-dimensional image data G(g(x), y) of the outbound and return trips, it is possible to improve the fingerprint matching accuracy.

In this case, it is not necessary to synthesize all the two-dimensional images of the outward and return paths of the fingerprint pattern, and the rotation direction of the roller 13 changes (changes from the +y force direction to the -y direction), and the rotary encoder 16 outputs positive direction pulses. Subsequently, for example, a two-dimensional image may be synthesized when three negative direction pulses are output in succession.

According to the embodiment described above, the fingerprint pattern can be input to the fingerprint input table 11 through the slit 14 in a non-contact manner, so that it is not affected by residual fingerprints. Furthermore, since the reading accuracy per pixel depends on the minimum detection amount δ of the rotary encoder 16 and the reading accuracy σ of the line image sensor 18, it is possible to achieve a reading accuracy of about 50 μm per pixel with a simple configuration. can.

Therefore, with a simple configuration, it is possible to reliably input a fingerprint pattern without being affected by residual fingerprints.

FIG. 7 is a schematic configuration diagram showing a second embodiment of the fingerprint input device according to the first invention of the present application, and FIG. 8 is a plan view of essential parts of the fingerprint input device of FIG. 7.

As shown in FIGS. 7 and 8, the fingerprint input device of this second embodiment includes a fingerprint input table 11. Guides 11a and 1
A 1b1 guide plate 12, rollers 13 and 132, a slit 14, a lighting device 15, a rotary encoder 16, a cylindrical lens 17, a line image sensor 18, a synthesis buffer 19, and a timing belt 20 are provided.

The configuration of the fingerprint input device of this embodiment is different from that of the first embodiment except that guides 112 and 11b10-ra 13a and a timing belt 20 are provided.
This embodiment differs from the configuration of the fingerprint input device in the embodiment described above, but the other main components are the same, and therefore, the same reference numerals are given to these same components.

The rollers 13 and 13g and the lighting device 15 are arranged horizontally on the fingerprint input table 11 such that the lighting device 15 is located between the rollers 13 and 13a, and the rollers 13 and 13g are placed in the lower part of FIG. As shown in
They are configured so that they can be rotated in the same direction via a timing belt 20.

Incidentally, the timing belt 20 may be composed of gears or the like instead.

Guides lla and llb are rollers 1 on the fingerprint input table 11.
3 (the side in the −y direction in the figure in which the finger F can move) and the downstream side of the roller 13a (the side in the +y direction in the figure in which the finger F can move). Further, the guides Ila and Ilb are formed to have a convex cross section so that the finger F on which the fingerprint pattern is to be input can slide and move on both the rollers 13 and 13a.

Similar to the first embodiment, the composition buffer 19 includes a line buffer 19a, a CPU 19b, and an image memory 19c, as shown in FIG.

The operation of the fingerprint input device of this second embodiment is similar to the operation of the device of the first embodiment.

That is, in the first embodiment described above, since the fingerprint surface of the finger F moves only on one roller 13, the tip of the finger F moves up and down (
In the second embodiment, the accuracy of the read image data may decrease if the finger moves in the direction shown in 2).
Since the fingerprint surface of can be moved horizontally by the rollers 13 and 13a and the guides lla and lTo, it is possible to improve the reading accuracy of the fingerprint pattern.

FIG. 9 is a schematic configuration diagram showing a third embodiment of the fingerprint input device according to the first invention of the present application.

As shown in the figure, the fingerprint input device of the third embodiment includes a fingerprint input table 11, guides 112 and 11b1, a guide plate 12, a roller 13, a lighting device 15, a rotary encoder 16, and a composition buffer 19. It is equipped.

In this third embodiment, the roller 1 of the above-mentioned second embodiment is
In place of the 3a1 slit 14, the cylindrical lens 17, the line image sensor 18, and the timing belt 200, a contact image sensor 21 on which the fingerprint surface of the finger F on which the fingerprint pattern is to be input is slidable is provided.

The contact image sensor 21 is disposed downstream of the lighting device 15 provided on the fingerprint input table 11 (on the +y direction side in the drawing where the finger F can move).

The other main components are the same as those of the fingerprint input device of the first and second embodiments, and therefore, the same reference numerals are given to these same components.

Similar to the first embodiment, the synthesis buffer 19 includes a line buffer 19a, a CPU 19b, and a CPU 19b, as shown in FIG.
and an image memory 19c.

The operation of the fingerprint input device of this third embodiment is similar to the operation of the devices of the first and second embodiments.

However, in this case, the fingerprint pattern of finger F is illuminated by the illumination device 15, and the reflected light from the fingerprint pattern is directly received by the contact image sensor 21 to read the fingerprint pattern, and the fingerprint pattern for one line is read. are sequentially stored in the line buffer 19a as one-dimensional image data g (x), and similar operations are performed thereafter.

That is, in the first and second embodiments, the reflected light from the fingerprint pattern of the finger F is guided through the slit 14, collimated by the cylindrical lens 17, and sent to the line image sensor 18.
However, in this third embodiment, the fingerprint pattern of the finger F is read only by the close-contact image sensor 21. The device can be made smaller compared to the embodiment.

FIG. 10 shows the first fingerprint input device according to the second invention of the present application.
FIG. 2 is a schematic configuration diagram showing an example.

As shown in the figure, the fingerprint input device of the first embodiment of the second invention of the present application includes a slit 14 and a lighting device 1.
5a and 15b10 - Taly encoder 16, cylindrical lens 17, line image sensor 18, composition buffer 19
, a cylindrical guide 30, a disk 31, a coil spring 32, a belt 33 and a pulley 34.

In the first embodiment of the second invention of the present application, instead of the flat fingerprint input table 11 of the first to third embodiments of the first invention, the inner diameter is the finger F on which the fingerprint pattern is to be input. A cylindrical guide 30, which has an outer diameter that substantially matches the outer diameter of the finger F and into which a finger F can be inserted, is provided, for example, horizontally.

Inside the cylindrical guide 30, a disk 31 having a size that approximately matches the inner diameter of the cylindrical guide 30 is arranged perpendicular to the moving direction of the finger F (the y direction in the figure).

The disc 31 is connected to a coil spring 32 via a belt 33. That is, the belt 33 is wound around a pulley 34 disposed outside the cylindrical guide 30, and a portion 33a of the belt 33 from the pulley 34 to the disk 31 is made of a hard material. part 33a
passes through a through groove 30a formed in the cylindrical guide 30 and is connected to the coil spring 32.

The disk 31 is also configured to be movable along the axial direction of the cylindrical guide 30 (the y direction in the drawing).

That is, the disk 31 is biased by the coil spring 32 disposed outside the cylindrical guide 30 in a direction opposite to the direction of insertion of the finger F (direction of arrow −y in the drawing) (in the direction of +y force of the arrow in the drawing). It is configured.

The above-mentioned rotary encoder 16 is connected to the pulley 34.

Therefore, insert the finger F inside the cylindrical guide 30, and
The tip of the disc 3 resists the biasing force of the coil spring 32.
When 1 is pressed, the disc 31 and the belt 33 move, so it is possible to detect the amount of movement of the finger F in the -y direction using the rotary encoder 16. - Since the other configurations are the same as those of the first to third embodiments of the first invention of the present application, the same reference numerals are given to these same configurations.

The slit 14 is formed approximately at the center of the lower side of the cylindrical guide 30.

The lighting devices 15a and +56, the cylindrical lens 17, and the line image sensor 18 are provided below the slit 14, and when the finger F is inserted inside the cylindrical guide 30, the fingerprint surface of the finger F or the Lighting device 15 from below! and 15b through the slit 14, the reflected light from the fingerprint pattern of the finger F is directly received by the cylindrical lens 17, and the reflected light parallelized by the cylindrical lens 17 reaches the line image sensor 18. It is arranged like this.

The detection signals of the amount and direction of movement of the finger F of the rotary encoder 16 and the read signals of the line image sensor 18 are output to the synthesis buffer 19, and the two-dimensional image data G ( g (x), y) are composed.

The minimum detection amount δ of the rotary encoder 16 and the reading accuracy σ of the line image sensor 18 are 50% per pixel.
The configuration is such that a diameter of approximately μm is selected.

The synthesis buffer 19 is connected to an identification device (not shown) that identifies the input fingerprint pattern.

The lighting device 15 is an embodiment of the lighting means of the second invention of the present application. The rotary encoder 16 is an embodiment of the movement detection means of the second invention of the present application.

The line image sensor 18 is an embodiment of the one-dimensional imaging means of the second invention of the present application. The synthesis buffer 19 is an embodiment of the synthesis means of the second invention of the present application.

The cylindrical guide 30 is an embodiment of the guide means of the second invention of the present application.

Further, as in the first embodiment of the first invention of the present application, the synthesis buffer 19 is a line buffer Ila as shown in FIG.
, CPU] 9b and an image memory 19c.

The operation of the fingerprint input device of this embodiment is similar to the operation of the device of the first embodiment of the first invention of the present application.

In this embodiment, by securing a large amount of read data, it is possible to improve the fingerprint verification accuracy.

That is, as shown in FIGS. 5 and 6, two-dimensional image data G (g (x) . Here, or as shown
Represents the position (coordinates) of the direction.

In this case, it is not necessary to synthesize all the two-dimensional images of the outward and return paths of the fingerprint pattern, and the rotation direction of the roller 13 changes (changes from the -y direction to the +y direction), and the rotary encoder 16 outputs positive direction pulses. Subsequently, for example, a two-dimensional image may be synthesized when three negative direction pulses are output in succession.

According to the first embodiment of the second invention of the present application, the inner diameter of the cylindrical guide 30 almost matches the outer diameter of the finger F, so that the finger F does not touch in the width direction (X direction in the drawing). Since it can be inserted and a fingerprint pattern can be input through the slit 14, it is not affected by residual fingerprints. or,
The reading accuracy per pixel is rotary encoder 1.
6 and the reading accuracy σ of the line image sensor 18, it is possible to achieve a reading accuracy of about 50 μm per pixel with a simple configuration.

Therefore, it is possible to accurately input a fingerprint pattern without being affected by residual fingerprints.

FIG. 11 shows a second fingerprint input device according to the second invention of the present application.
A schematic configuration diagram showing the main parts of the embodiment, and FIG.
FIG. 2 is a schematic configuration diagram showing the overall configuration of the fingerprint input device shown in FIG. 1;

As shown in FIGS. 11 and 12, the fingerprint input device of the second embodiment of the second invention of the present application has a slit 14.
, illumination device 152 and 15b10 - Taly encoder 16, cylindrical lens 17, line image sensor 18,
Synthesis buffer 19, cylindrical guide 40, cylindrical member 4]
, rollers 42 and 43, a coil spring 44, and a roller 45.

In the second embodiment of the second invention of the present application, the cylindrical guide 30, the disk 31, and the coil spring 32 of the first embodiment are
, instead of the belt 33 and pulley 34, it has an end wall having the same size as the cylindrical guide 30 and at its tip, that is, on the side opposite to the insertion opening 40a for the finger F (the side in the y direction in the drawing). A cylindrical guide 40 is provided.

The cylindrical guide 40 is an embodiment of the guide means of the second invention of the present application.

A cylindrical member 41 is arranged inside the cylindrical guide 40, and a rotary encoder 16 is fixed inside the cylindrical member 41.

The cylindrical member 41 is configured to be movable inside the cylindrical guide 40 along its axial direction (y direction in the figure) via rollers 42 and 43 provided at the upper and lower ends, respectively. The shaped member 41 is also connected to the end wall of the cylindrical guide 40 via a coil spring 44, and the coil spring 44 allows the finger F to be inserted in the direction opposite to the insertion direction (-y direction in the figure) (in the +y force direction in the figure). Forced.

The rollers 43 at the lower end are connected to the rotary encoder 16 inside the cylindrical member 41 via the rollers 45. Therefore, when the finger F is inserted inside the cylindrical guide 40, its tip is exposed to the biasing force of the coil spring 44. When the cylindrical member 41 is pushed against this, the cylindrical member 41 moves together with the rotary encoder 16, and the rotary encoder 16 can detect the amount and direction of movement of the finger F.

The other main configurations are the same as those of the first to third embodiments of the first invention of the present application and the second embodiment of the second invention of the present application, so these same configurations will be described. shall bear the same reference number.

Further, as in the first embodiment of the first invention of the present application, the synthesis buffer 19 is a line buffer y19a as shown in FIG.
It is equipped with 5 CPU I9b and an image memory 19C.

The operation of the fingerprint input device of the second embodiment of the second invention of the present application is similar to the operation of the device of the first embodiment of the first invention of the present application.

That is, in this embodiment as well, since the inner diameter of the cylindrical guide 0 almost matches the outer diameter of the finger F, the finger F can be inserted in the width direction (X direction in the figure) without wobbling, and the finger F can be inserted through the slit 14. Since the fingerprint pattern can be entered using Furthermore, since the reading accuracy per pixel depends on the minimum detection amount δ of the rotary encoder 16 and the reading accuracy σ of the line image sensor 18, it is possible to achieve a reading accuracy of about 50 μm per pixel with a simple configuration. can.

Therefore, it is possible to accurately input a fingerprint pattern without being affected by residual fingerprints.

[Effects of the Invention] As explained above, the first invention of the present application includes an illumination means for illuminating a finger on which a fingerprint pattern is to be input, and an illumination means arranged along a direction perpendicular to the direction of movement of the finger so that the finger is illuminated. A roller that can be rotated by contact and movement, a movement detection means that can detect the amount of finger movement from the amount of rotation of the roller, and a direction in which the finger moves by directly receiving light from the illumination means reflected by the fingerprint pattern. a one-dimensional image capturing device that captures a one-dimensional image in a direction perpendicular to the image capturing device; Since the present invention includes a composition means for synthesizing images, a fingerprint pattern can be reliably input without being affected by residual fingerprints with a simple configuration.

Further, a second invention of the present application includes an illumination means for illuminating a finger on which a fingerprint pattern is to be input, a guide means into which the finger can be inserted,
A movement detection means capable of detecting the amount of movement of the finger inserted inside the guide means, and a movement detection means that directly receives light from the illumination means reflected by the fingerprint pattern to generate a one-dimensional image in a direction perpendicular to the direction of movement of the finger. A one-dimensional image capturing means for capturing an image, and a synthesizing means for synthesizing a two-dimensional image of a fingerprint pattern based on the one-dimensional image captured by the one-dimensional image capturing means and the amount of movement of the finger detected by the movement detecting means. Because there are
With a simple configuration, it is possible to reliably input a fingerprint pattern without being affected by residual fingerprints.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a fingerprint input device according to the first invention of the present application, FIG. 2 is a plan view of essential parts showing the fingerprint input device of FIG. 1, and FIG. 4 is a flowchart for explaining the operation of the fingerprint input device of FIG. 1, and FIGS. 5 and 6 are explanations of the operation of the fingerprint input device of FIG. 1. 7 is a schematic configuration diagram showing a second embodiment of the fingerprint input device according to the first invention of the present application, FIG. 8 is a plan view of main parts showing the fingerprint input device of FIG. 7, and FIG. 9 10 is a schematic configuration diagram showing a third embodiment of the fingerprint input device according to the first invention of the present application, and FIG. 10 is a schematic configuration diagram showing the first embodiment of the fingerprint input device according to the second invention of the present application. , FIG. 11 is a schematic configuration diagram showing the main parts of a second embodiment of the fingerprint input device according to the second invention of the present application, and FIG. 12 is a schematic configuration diagram showing the overall configuration of the fingerprint input device of FIG. 11. It is. 11...Fingerprint input table, lla, fib...
...Guide, 12...Guide plate, 13.1
3a...Roller, 14...Slit,
15, i5a% 15b... lighting device,
16...Rotary encoder, 17...
・Cylindrical lens, 18... Line image sensor, 19... Combination buffer, 19a...
・Line buffer, 19b...CPU, 19c
... Image memory, 20 ... Timing belt, 21 ... Close contact image sensor, 30.
40...Cylindrical guide, 31...Disc, 32...Coil spring, 33...Belt 34...Pulley, 41... ...Cylindrical member, 42.43.45...Colo, 44...
...Coil spring. Figure 1 Figure 7 To column m vs. I Figure 1Q Figure 1t

Claims (2)

[Claims] (1) An illumination means for illuminating a finger on which a fingerprint pattern is to be input; a roller arranged along a direction perpendicular to the direction of movement of the finger and rotatable when the finger comes into contact with the finger; movement detection means capable of detecting the amount of movement of the finger from the amount of rotation;
a one-dimensional image capturing means for capturing a dimensional image; and a two-dimensional image of the fingerprint pattern based on the one-dimensional image captured by the one-dimensional image capturing means and the amount of movement of the finger detected by the movement detecting means. 1. A fingerprint input device comprising a composition means for composition. (2) illumination means for illuminating the finger into which a fingerprint pattern is to be input; guide means into which the finger can be inserted; movement detection means capable of detecting the amount of movement of the finger inserted inside the guide means;
one-dimensional imaging means that directly receives the light from the illumination means reflected by the fingerprint pattern and captures a one-dimensional image in a direction perpendicular to the direction of movement of the finger; A fingerprint input device comprising: composition means for composition of a two-dimensional image of the fingerprint pattern based on the image and the amount of movement of the finger detected by the movement detection means.