JP3941635B2 - Fingerprint image input device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fingerprint image input device for inputting a fingerprint image.
[0002]
[Prior art]
In recent years, networking of electronic devices has progressed, communication between electronic devices has become free, and various information can be accessed from anywhere. Accordingly, the importance of security is increasing in order to prevent unauthorized access from a malicious person. One security technique is a method for personal authentication using fingerprints, and a technique for applying personal authentication using fingerprints to portable electronic devices has been proposed. For fingerprint authentication, a portable electronic device must be equipped with an image input device for inputting a fingerprint image (see, for example, Patent Document 1).
[0003]
Patent Document 1 describes an image input device 300 as shown in FIG. The image input apparatus 300 has a cylindrical transparent rotating roller 302 supported by a casing 301 so as to be rotatable around an axis, an optical axis perpendicular to the axis of the transparent rotating roller 302, and transparent rotation. Placed in roller 302 Refractive index distribution type Lens 303 (For example, SELFOC lens manufactured by Nippon Sheet Glass Co., Ltd. SELFOC is a registered trademark of Nippon Sheet Glass Co., Ltd.) In the transparent rotating roller 302 Refractive index distribution type A one-dimensional imaging device 304 disposed on the optical axis of the lens 303; Refractive index distribution type A light source 305 that emits light toward a location where the optical axis of the lens 303 and the transparent rotation roller 302 intersect.
[0004]
As shown in FIG. 11, the one-dimensional imaging device 304 includes a silicon substrate 304a, and a light receiving portion 304b and a bonding pad 304c are formed on the silicon substrate 304a. The one-dimensional image sensor 304 is mounted on the surface 306a of the substrate 306 by a wire bonding method. That is, the silicon substrate 304 a is mounted on the surface 306 a of the substrate 306 so that the light receiving portion 304 b faces the substrate 306, and the lead electrode formed on the surface 306 a and the bonding pad 304 c are connected by the lead wire 308. Yes. Thereby, an electrical signal can be exchanged with the light receiving unit 304b via the lead wire 308.
[0005]
The surface 306a of the substrate 306 is Refractive index distribution type Opposite to the exit surface 303b of the lens 303, the light receiving portion 304b of the one-dimensional image sensor 304 is directed to the exit surface 303b.
[0006]
In order to input a fingerprint image of the finger 310 with the image input device 300 described above, Refractive index distribution type The finger 310 is moved in the tangential direction by pressing against the outer peripheral surface 302a of the transparent rotating roller 302 at a location where the optical axis of the lens 303 intersects. The moving finger 310 is illuminated by the light source 305, and the reflected light of the finger 310 at the portion in contact with the outer peripheral surface 302a is Refractive index distribution type Incident on the incident surface 303a of the lens 303, Refractive index distribution type Propagates in the lens 303, Refractive index distribution type The light exits from the exit surface 303 b of the lens 303 and enters the light receiving portion 304 b of the one-dimensional image sensor 304. here, Refractive index distribution type The lens 303 forms an image of the finger 310 at a portion in contact with the outer peripheral surface 302a of the transparent rotating roller 302 on the light receiving unit 304b, and the one-dimensional imaging element 304 has a finger 310 at a portion in contact with the outer peripheral surface 302a at the light receiving unit 304b. Take an image. In this way, by moving the finger 310 in the tangential direction of the transparent rotating roller 302, the finger 310 is linearly scanned by the one-dimensional image sensor 304, and the images obtained by the one-dimensional image sensor 304 are sequentially synthesized. A two-dimensional image of the finger 310 is obtained. In the image input apparatus 300 described above, the transparent rotary roller 302 is provided with Refractive index distribution type Since the lens 303, the one-dimensional imaging device 304, and the light source 305 are arranged, there is an advantage that the image input device 300 can be made compact.
[0007]
[Patent Document 1]
JP 2002-133402 A (pages 7 to 8, FIG. 15)
[0008]
[Problems to be solved by the invention]
However, when the image input device 300 is provided in a portable electronic device, there is a demand for making the image input device 300 more compact. In order to make the image input device 300 compact, it is necessary to reduce the size of the transparent rotating roller 302. When the transparent rotating roller 302 is downsized and the diameter of the transparent rotating roller 302 is shortened, the following problems occur.
[0009]
In order to form an image of the finger 310 in contact with the outer peripheral surface 302a of the transparent rotating roller 302 on the light receiving unit 304b of the one-dimensional image sensor 304, Refractive index distribution type The distance from the main surface of the lens 303 to the outer peripheral surface 302a; Refractive index distribution type The distance from the main surface of the lens 303 to the light receiving unit 304b must satisfy the imaging formula. That means Refractive index distribution type From the main surface of the lens 303 to the outer peripheral surface 302a Refractive index distribution type A distance depending on the focal length of the lens 303 must be maintained, Refractive index distribution type From the main surface of the lens 303 to the light receiving unit 304b Refractive index distribution type A distance depending on the focal length of the lens 303 must be maintained. However, even if the imaging formula is satisfied, if the diameter of the transparent rotating roller 302 is shortened, the one-dimensional imaging device 304 cannot be accommodated in the transparent rotating roller 302. Refractive index distribution type There is also a possibility that the lens 303 cannot be accommodated in the transparent rotating roller 302. Reduce the diameter of the transparent rotating roller 302, Refractive index distribution type In order to fit the lens 303 and the one-dimensional imaging device 304 in the transparent rotating roller 302 and satisfy the imaging formula, Refractive index distribution type It is necessary to shorten the focal length of the lens 303. However, Refractive index distribution type There is a limit to shortening the focal length of the lens 303.
[0010]
Therefore, the object of the present invention is to Refractive index distribution type Even if the focal length of the lens 303 is not shortened, the transparent rotating roller 302 can be used. Refractive index distribution type An object of the present invention is to provide an image input device that can accommodate the lens 303 and the one-dimensional imaging device 304 and can reduce the diameter of the transparent rotating roller 302.
[0011]
[Means for Solving the Problems]
A fingerprint image input apparatus according to the present invention is a transparent cylinder that is rotatably supported around an axis, and rotates by moving a finger in contact with an outer peripheral surface thereof in a tangential direction, and the cylinder A one-dimensional image sensor that has a light-receiving unit and acquires an image by receiving light at the light-receiving unit, a film substrate that is arranged in the cylinder and on which the one-dimensional image sensor is mounted, and the cylinder And a fingerprint image at a portion where the finger is in contact with the outer peripheral surface of the cylinder is formed on the light receiving portion of the one-dimensional image sensor. Refractive index distribution type A lens array and a holder fixedly disposed in the cylinder, the through hole provided in the holder Refractive index distribution type A fingerprint image input device comprising: a lens array; and a holder to which a film substrate on which the one-dimensional imaging device is mounted is attached below a through-hole of the holder, wherein the one-dimensional imaging device is a silicon substrate The silicon substrate has a structure having a light receiving portion on which photoelectric conversion elements are arranged in a row, and the silicon substrate has a bonding pad for inputting and outputting an electric signal on a surface where the light receiving portion exists, and the film substrate has The above Refractive index distribution type A through-hole is formed at a position corresponding to the optical axis of the lens, a bump as a wiring terminal is provided on the back surface, and the bonding pad and the bump are bonded, so that the light receiving portion of the one-dimensional imaging element is Said Refractive index distribution type The one-dimensional image sensor is fixed to the back surface of the film substrate so as to be positioned on the optical axis of the lens array.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
[0028]
[First embodiment]
FIG. 1 is a side cross-sectional view showing the image input apparatus 1 in a cutaway manner.
[0029]
The image input apparatus 1 includes a translucent rotating roller 2, and the rotating roller 2 is made of an acrylic resin, such as polycarbonate, other resins, borosilicate glass, quartz glass, and other glass. It may be formed of a transparent material. The rotating roller 2 has a cylindrical shape, and the inside of the rotating roller 2 is hollow. The rotating roller 2 is supported around the casing 3 and the like so as to be rotatable around its axis. In FIG. 1, the direction in which the axis of the rotating roller 2 extends is the depth direction of the sheet (the direction perpendicular to the sheet of FIG. 1), and in the following, the direction in which the axis of the rotating roller 2 extends. It demonstrates as a left-right direction.
[0030]
The rotating roller 2 is housed in the housing 3, and a part of the outer peripheral surface 2 a of the rotating roller 2 is exposed in the image capturing window 3 a formed in the housing 3, and from the image capturing window 3 a. It protrudes slightly out of the housing 3. Then, with the finger 200 pressed against the outer peripheral surface 2a of the rotating roller 2 in the image capturing window 3a, the finger 200 is moved forward or rearward (that is, at a portion where the outer peripheral surface 2a of the rotating roller 2 is in contact with the finger 200). When it is moved in the tangential direction), the rotating roller 2 rotates about its axis.
[0031]
The hollow in the rotating roller 2 includes a one-dimensional image sensor (line image sensor) 4 that captures a one-dimensional image of the finger 200 at a portion in contact with the outer peripheral surface 2a of the rotating roller 2 in the image capturing window 3a. The light irradiator 5 that emits light toward the image capturing window 3a to irradiate the finger 200 with light at the portion that is in contact with the outer peripheral surface 2a of the rotating roller 2 and the outer surface 2a of the rotating roller 2 A one-dimensional image of the finger 200 in the portion is formed on the one-dimensional image sensor 4. Refractive index distribution type Lens array 6 (For example, SELFOC lens manufactured by Nippon Sheet Glass Co., Ltd. SELFOC is a registered trademark of Nippon Sheet Glass Co., Ltd.) Are arranged. A holder 7 is disposed in the hollow inside the rotating roller 2, and the one-dimensional image sensor 4, the light irradiator 5, Refractive index distribution type A lens array 6 is attached.
[0032]
The holder 7 extends from one end or both ends of the rotating roller 2 to the outside of the hollow and is fixed to the housing 3 and the like, and the holder 7 is supported so as not to rotate even when the rotating roller 2 rotates. The holder 7 is formed with an optical path hole 7a penetrating in a direction substantially perpendicular to the axis of the rotating roller 2, and the image capturing window 3a is located on the extension of the optical path hole 7a in the penetrating direction. . In the optical path hole 7 a formed in the holder 7 Refractive index distribution type By fitting the lens array 6, Refractive index distribution type The lens array 6 is fixed to the holder 7.
[0033]
Refractive index distribution type The lens array 6 has a plurality of central axes orthogonal to the axis of the rotating roller 2. Refractive index distribution type The lenses are arranged in a row parallel to the axis of the rotating roller 2, and a plurality of lenses are arranged. Refractive index distribution type This is an optical system that forms one continuous image with the entire lens. Refractive index distribution type In the lens array 6, a plurality of Refractive index distribution type There may be one or more rows of lenses that are parallel to the axis of the rotating roller 2.
[0034]
each Refractive index distribution type The lens is a cylindrical rod lens, has a parabolic refractive index distribution from the central axis to the peripheral surface, and has the highest refractive index at the central axis and the lowest refractive index at the peripheral surface. Therefore, each Refractive index distribution type The lens has almost the same optical effect as a spherical lens. Refractive index distribution type The lenses have optically equivalent properties.
[0035]
Like the above Refractive index distribution type The optical axis of the lens array 6 is orthogonal to the axis of the rotating roller 2. And Refractive index distribution type The incident surface 6a of the lens array 6 is directed to the image capture window 3a. Refractive index distribution type A portion where the optical axis of the lens array 6 intersects the rotating roller 2 is in the image capturing window 3a.
[0036]
The light irradiator 5 includes a light emitting element 8 and a light guide prism 9. The light-emitting element 8 is a self-light-emitting element such as an LED, an organic EL, an inorganic EL, and a fluorescent tube, and is provided on the substrate 10. The substrate 10 and the light emitting element 8 are Refractive index distribution type It is embedded in the holder 7 behind the lens array 6.
[0037]
The light guide prism 9 is fitted on the holder 7 and provided on the substrate 10 so as to cover the light emitting element 8. An incident surface 9 a of the light guide prism 9 is directed to the light emitting element 8, and an output surface 9 b of the light guide prism 9 is connected to the rotating roller 2. Refractive index distribution type It is directed to a location where the optical axis of the lens array 6 intersects. The light exiting surface 9 b of the light guide prism 9 is elongated along the rotating roller 2 from side to side. The light guide prism 9 makes the light emitted from the light emitting element 8 incident on the incident surface 9a, propagates the incident light to the exit surface 9b, and propagates the propagated light from the exit surface 9b toward the image capturing window 3a. Exit. Since the exit surface 9b is elongated from side to side, the light emitted from the exit surface 9b is Refractive index distribution type A finger which is irradiated in a band shape parallel to the axis of the rotating roller 2 at a position where the optical axis of the lens array 6 intersects the rotating roller 2 and pressed against the outer peripheral surface 2a of the rotating roller 2 in the image capturing window 3a. 200 is irradiated.
[0038]
As shown in FIG. 2, the one-dimensional imaging device 4 includes a silicon substrate 20. A light receiving unit 11 that receives light is formed on the silicon substrate 20, and the light receiving unit 11 and the electric signal are Bonding pads 12 for input / output are formed. In the light receiving unit 11, a plurality of photoelectric conversion elements that convert electrical signals according to the intensity of incident light (or the amount of incident light) are arranged in the left-right direction (that is, parallel to the axis of the rotating roller 2). It has a structure. Examples of the photoelectric conversion element include a CCD image sensor, a CMOS image sensor, and a semiconductor element made of amorphous silicon.
[0039]
The one-dimensional image sensor 4 is mounted on the film substrate 13 by a COF (Chip On Film) method. The film substrate 13 is attached to the lower surface 7 b of the holder 7 so as to close the optical path hole 7 a of the holder 7. The surface 13a of the film substrate 13 is Refractive index distribution type Opposite to the exit surface 6b of the lens array 6, the film substrate 13 is Refractive index distribution type It is perpendicular to the optical axis of the lens array 6. The film substrate 13 is formed with a through hole 13c penetrating from the front surface 13a of the film substrate 13 to the back surface 13b. When the film substrate 13 is viewed in a direction perpendicular to the film substrate 13, the through hole 13 c has a long rectangular shape in the axial direction of the rotating roller 2. And the through hole 13c faces the optical path hole 7a, Refractive index distribution type The film substrate 13 is arranged so that the optical axis of the lens array 6 passes through the through hole 13c.
[0040]
Wiring is applied to the back surface 13b of the film substrate 13, and bumps 14 made of metal or alloy such as solder and gold are provided on the terminals of the wiring. The one-dimensional image sensor 4 is mounted on the back surface 13 b of the film substrate 13. Specifically, the bonding pad 12 of the one-dimensional image sensor 4 is bonded to the wiring terminal via the bump 14, so that the one-dimensional image sensor 4 is fixed to the back surface 13 b of the film substrate 13. Here, the surface of the silicon substrate 20 where the bonding pad 12 and the light receiving portion 11 are formed faces the back surface 13 b of the film substrate 13. In addition, the light receiving portion 11 of the one-dimensional image sensor 4 faces the through hole 13c, Refractive index distribution type When the film substrate 13 is viewed in the optical axis direction of the lens array 6, the light receiving unit 11 is disposed in the through hole 13c. And Refractive index distribution type The exit surface 6b of the lens array 6 is directed to the light receiving unit 11, Refractive index distribution type The optical axis of the lens array 6 reaches the light receiving unit 11 through the through hole 13c so as to avoid the film substrate 13.
[0041]
here, Refractive index distribution type Each of the lens array 6 Refractive index distribution type The lens forms an erect image at an equal magnification. That is, each Refractive index distribution type The lens forms an image appearing on the outer peripheral surface 2 a of the rotating roller 2 on the light receiving unit 11, but the image formed on the light receiving unit 11 is the same size as the image appearing on the outer peripheral surface 2 a of the rotating roller 2. The direction is the same and is not reversed. Therefore, Refractive index distribution type The lens array 6 includes a plurality of Refractive index distribution type The entire lens forms an image appearing on the outer peripheral surface 2a of the rotating roller 2 on the light receiving unit 11 at an erecting equal magnification.
[0042]
Since the one-dimensional image sensor 4 is mounted on the back surface 13 b of the film substrate 13, nothing is provided on the back side of the one-dimensional image sensor 4. That is, in this image input device 1, the one-dimensional imaging device 4 is provided by the thickness of the film substrate 13 as compared with the case of the conventional image input device 300 (shown in FIG. 10). Refractive index distribution type The lens array 6 can be arranged far from the exit surface 6b. for that reason, Refractive index distribution type To satisfy the imaging formula without shortening the focal length of the lens array 6 Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be disposed in the rotating roller 2.
[0043]
In other words, since the one-dimensional imaging device 4 is mounted on the back surface 13b of the film substrate 13, there is no substrate between the one-dimensional imaging device 4 and the inner surface 2b of the rotating roller 2. Refractive index distribution type The distance from the intersection of the optical axis of the lens array 6 and the outer peripheral surface 2a of the rotating roller 2 (that is, the position where the finger 200 is in contact) to the one-dimensional imaging device 4 can be up to the diameter of the rotating roller 2. . On the other hand, in the conventional image input device 300, the maximum distance that can be taken from the position where the finger 310 contacts to the one-dimensional imaging device 304 is shorter than the diameter of the transparent rotating roller 302 by at least the thickness of the substrate 306. Therefore, in the image input device 1 of the present embodiment, when the diameter of the rotating roller 2 is shorter than the conventional transparent rotating roller 302 by the thickness of the substrate 306, Refractive index distribution type Even if the focal length of the lens array 6 is not shortened, it is in the rotating roller 2. Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be accommodated.
[0044]
Next, the circuit configuration of the image input apparatus 1 will be described with reference to FIG.
In FIG. 3, a synchronization signal generator 15 is a rotary encoder or the like, which generates a synchronization signal every time the rotating roller 2 rotates by a predetermined angle, and converts the synchronization signal into a driver circuit 16, a signal processing circuit 17, and A / D conversion. Output to the circuit 18 and the synthesis buffer 19. These circuits 16 to 19 operate in synchronization with the synchronization signal.
[0045]
The driver circuit 16 drives the one-dimensional image sensor 4 in accordance with the synchronization signal input from the synchronization signal generator 15. The one-dimensional imaging device 4 acquires a one-dimensional image as an electric signal by converting the light intensity (or light amount) received by the light receiving unit 11 into an electric signal, and outputs the electric signal to the signal processing circuit 17. The signal processing circuit 17 detects the level of the electric signal by processing the electric signal input from the one-dimensional image sensor 4. The A / D conversion circuit 18 converts the level of the electric signal into a digital signal, and outputs it to the synthesis buffer 19 as one-dimensional image data. One-dimensional image data is sequentially stored in the synthesis buffer 19 from the A / D conversion circuit 18 according to the synchronization signal, and the synthesis buffer 19 sequentially synthesizes the one-dimensional image data to generate two-dimensional image data. The two-dimensional optical image data generated by the synthesis buffer 19 is output to a computer, and the two-dimensional optical image data is used for computer processing.
[0046]
A method of using the image input apparatus 1 configured as described above and the operation of the image input apparatus 1 will be described.
When the subject presses the finger 200 against the outer peripheral surface 2a of the rotating roller 2 in the image capturing window 3a, the light emitting element 8 emits light, and the light emitted from the light emitting element 8 propagates through the light guide prism 9, and the exit surface 9b. Light exits toward the image capture window 3a. As a result, the finger 200 in contact with the outer peripheral surface 2a of the rotating roller 2 is irradiated in the image capturing window 3a.
[0047]
When the subject moves the finger 200 forward or backward while pressing the finger 200 against the outer peripheral surface 2a of the rotating roller 2, the rotating roller 2 rotates. As the rotating roller 2 rotates, the contact portion between the finger 200 and the rotating roller 2 changes, and the finger 200 is line-scanned by the light emitted from the emission surface 9b.
[0048]
Here, at the portion where the rotating roller 2 and the finger 200 are in contact with each other, the convex portion of the fingerprint is in close contact with the outer peripheral surface 2 a of the rotating roller 2, and the concave portion of the fingerprint is separated from the outer peripheral surface 2 a of the rotating roller 2. Since the convex portion of the fingerprint is in close contact with the outer peripheral surface 2 a of the rotating roller 2, the light emitted from the exit surface 9 b of the light guide prism 9 enters the convex portion of the fingerprint through the rotating roller 2 with high intensity. The light reflected at the convex part of Refractive index distribution type The light is incident on the light receiving unit 11 of the one-dimensional image sensor 4 through the lens array 6 with high intensity. On the other hand, since the concave portion of the fingerprint is separated from the outer peripheral surface 2a of the rotating roller 2, the light emitted from the output surface 9b of the light guide prism 9 is repeatedly reflected or irregularly reflected between the fingerprint concave portion and the outer peripheral surface 2a. Therefore, light is incident on the concave portion of the fingerprint with low intensity, and reflected light in the concave portion of the fingerprint is also low in intensity. Therefore, the reflected light of the concave portion of the fingerprint enters the light receiving portion 11 of the one-dimensional image sensor 4 with low intensity.
[0049]
As described above, the intensity of reflected light according to the unevenness of the finger 200 is Refractive index distribution type A one-dimensional image that is incident on the light receiving unit 11 of the one-dimensional image sensor 4 through the lens array 6 and is in contact with the outer peripheral surface 2a of the rotating roller 2 and the finger 200 (here, the one-dimensional image is a fingerprint image). This is a contrast image defined by irregularities and is an image that is long in the axial direction of the rotating roller 2). Refractive index distribution type An image is formed on the light receiving unit 11 by the lens array 6. As described above, when the subject presses the finger 200 against the rotating roller 2 to rotate the rotating roller 2, the subject's finger 200 is sequentially line-scanned by the one-dimensional imaging device 4. The one-dimensional imaging device 4 acquires a one-dimensional image of the fingerprint as an electric signal every time line scanning of the finger 200 is performed in synchronization with the synchronization signal, and outputs the one-dimensional image to the A / D conversion circuit 18. Then, the one-dimensional image data of the fingerprint is sequentially output from the A / D conversion circuit 18 to the synthesis buffer 19, and the one-dimensional image data of the fingerprint is sequentially synthesized by the synthesis buffer 19. When the one-dimensional image data of the fingerprint is synthesized, the two-dimensional image data of the fingerprint is generated by the synthesis buffer 19.
[0050]
Also, a pattern (meaning including letters, numbers, pictures, etc.) appearing on the surface of a smooth and flat subject such as paper can be input as a two-dimensional image by the image input apparatus 1. In this case, since the subject is in close contact with the outer peripheral surface 2a of the rotating roller 2, the intensity of the reflected light that is incident on and reflected from the exit surface 9b of the light guide prism 9 corresponds to the pattern appearing on the surface of the subject. . Accordingly, the subject is line-scanned by the one-dimensional image sensor 4, and the pattern appearing on the surface of the subject is acquired as a one-dimensional image by the one-dimensional image sensor 4. When the one-dimensional image data of the subject pattern is sequentially synthesized, the two-dimensional image data of the pattern is generated by the synthesis buffer 19.
[0051]
In the above description, the subject is pressed against the outer peripheral surface 2a of the rotating roller 2 to move the subject in the tangential direction of the rotating roller 2. However, the subject is pressed against the outer peripheral surface 2a of the rotating roller 2 to the subject. Even if the body 3 is moved in the tangential direction and the rotating roller 2 is rolled in the tangential direction, the two-dimensional data of the subject can be acquired in the same manner.
[0052]
The image input apparatus 1 as described above is suitable for being provided in a portable electronic device such as a mobile phone, a PDA (Personal Digital Assistant), or a notebook personal computer, but may be provided in another electronic device. In the electronic device, the two-dimensional image data acquired by the image input device 1 is used for processing of the computer. For example, when the two-dimensional image data is fingerprint data, the computer uses the registered registrant's data. A process of comparing the registered fingerprint image data with the two-dimensional image data acquired by the image input device 1, a process of determining whether or not the two-dimensional image data matches the registered fingerprint image data, and a two-dimensional image When the data matches the registered fingerprint image data, a process of recognizing the subject as a registrant is performed. When the image input device 1 is provided in an electronic device, the housing 3 may be a housing of the electronic device.
[0053]
Of course, the image input apparatus 1 may exist as a single unit. In that case, the image input apparatus 1 has an interface, and the two-dimensional image data generated by the synthesis buffer 19 may be output to another electronic device or the like via the interface.
[0054]
As described above, according to the present embodiment, since the one-dimensional imaging device 4 is mounted on the back surface 13b of the film substrate 13, the distance from the location where the finger 200 is in contact with the outer peripheral surface 2a to the one-dimensional imaging device 4 Can take up to the diameter of the rotating roller 2. Therefore, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type Without shortening the focal length of the lens array 6, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be accommodated. Therefore, the image input device 1 can be reduced in size.
[0055]
Moreover, since the through-hole 13c is formed in the film substrate 13, and the light receiving portion 11 of the one-dimensional imaging device 4 faces the through-hole 13c, Refractive index distribution type The optical axis of the lens array 6 is not interfered by the film substrate 13. Refractive index distribution type Since light emitted from the exit surface 6 b of the lens array 6 enters the light receiving unit 11, a one-dimensional image of a subject such as the finger 200 is one-dimensionally displayed even if the one-dimensional imaging device 4 is mounted on the back surface 13 b of the film substrate 13. An image can be picked up by the image pickup device 4.
[0056]
[Second Embodiment]
Next, as shown in FIG. 4, an image input device 21 different from the image input device 1 will be described. About the image input device 21, the same code | symbol is attached | subjected to the component similar to the image input device 1 in 1st embodiment, and detailed description is abbreviate | omitted.
[0057]
The image input device 21 shown in FIG. 4 includes a film substrate 23 instead of the film substrate 13 shown in FIG. The difference between the film substrate 23 and the film substrate 13 is that the film substrate 13 has a through hole 13c, whereas the film substrate 23 has no through hole. However, the film substrate 23 is a transparent portion 23c that is transparent so that a portion corresponding to the through hole 13c transmits light.
[0058]
That is, the film substrate 23 is Refractive index distribution type The transparent portion 23c orthogonal to the optical axis of the lens array 6 is transparent, and light is shielded in other portions. Similar to the film substrate 13 of the first embodiment, the surface 23a of the film substrate 23 is Refractive index distribution type Opposite to the exit surface 6b of the lens array 6, the back surface 23b of the film substrate 23 is wired, and the terminals of the wiring and the bonding pads 12 are joined by the bumps 14, so that the one-dimensional image pickup device 4 becomes a film substrate. It is mounted on the back surface 23b of the 23. Unlike the film substrate 13 in the first embodiment, the film substrate 23 is not formed with a through hole. Therefore, when the one-dimensional image sensor 4 is mounted on the back surface 23b of the film substrate 23, the one-dimensional image sensor. Since the whole 4 is supported by the back surface 23 b of the film substrate 23, the one-dimensional imaging device 4 can be easily mounted on the back surface 23 b of the film substrate 23.
[0059]
Refractive index distribution type When the film substrate 23 is viewed in the optical axis direction of the lens array 6, the light receiving unit 11 is disposed on the transparent unit 23c. Therefore, the reflected light reflected at the portion where the subject such as the finger 200 is in contact with the outer peripheral surface 2a of the rotary roller 2 is reflected. Refractive index distribution type A one-dimensional image is incident on the light receiving portion 11 of the one-dimensional image sensor 4 through the lens array 6 and the transparent portion 23c, and a portion where the outer peripheral surface 2a of the rotating roller 2 is in contact with the finger 200 is formed. Refractive index distribution type An image is formed on the light receiving unit 11 by the lens array 6.
The image input device 21 also has a circuit configuration as shown in FIG. 3 like the image input device 1, and the one-dimensional image data is sequentially synthesized by the synthesis buffer 19 to generate two-dimensional image data.
[0060]
Even in this image input device 21, similarly to the image input device 1 of the first embodiment, since the one-dimensional imaging device 4 is mounted on the back surface 23 b of the film substrate 23, even when the diameter of the rotating roller 2 is formed short. , Refractive index distribution type Without shortening the focal length of the lens array 6, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be accommodated. Of course, the film substrate 23 is Refractive index distribution type Since the lens array 6 has a transparent portion 23c where the optical axes intersect, even if the one-dimensional image sensor 4 is mounted on the back surface 23b of the film substrate 23, a one-dimensional image of a subject such as the finger 200 is captured. Images can be taken with the element 4.
[0061]
[Third embodiment]
Next, as shown in FIG. 5, an image input device 31 different from the image input device 1 will be described. About the image input device 31, the same code | symbol is attached | subjected to the component similar to the image input device 1 in 1st embodiment, and detailed description is abbreviate | omitted.
[0062]
An image input device 31 shown in FIG. 5 includes a film substrate 33 instead of the film substrate 13 shown in FIG. The difference between the film substrate 13 and the film substrate 33 is that the film substrate 13 has a through hole 13c, whereas the film substrate 33 has no through hole. However, the film substrate 33 is transparent so that the whole transmits light. Even if the one-dimensional imaging device 4 is mounted on the back surface 33b of the film substrate 33, the light receiving unit 11 is directed to the back surface 33b of the film substrate 33, and the light receiving unit 11 is Refractive index distribution type It is located on the optical axis of the lens array 6. Therefore, Refractive index distribution type When light enters the surface 33 a of the film substrate 33 from the exit surface 6 b of the lens array 6, the light passes through the film substrate 33 and enters the light receiving unit 11, and the outer peripheral surface 2 a of the rotating roller 2 and the finger 200 contact each other. The one-dimensional image at the contacted part Refractive index distribution type The lens array 6 forms an image on the light receiving unit 11 of the one-dimensional image sensor 4. Of course, this image input device 31 also has a circuit configuration as shown in FIG. 3, and the one-dimensional image data is sequentially synthesized by the synthesis buffer 19 to generate two-dimensional image data.
[0063]
Even in this image input device 31, since the one-dimensional imaging device 4 is mounted on the back surface 33b of the film substrate 33 as in the case of the image input device 1 of the first embodiment, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type Even if the focal length of the lens array 6 is not shortened, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be accommodated. In addition, since the film substrate 33 is transparent, even if the one-dimensional image sensor 4 is mounted on the back surface 33b of the film substrate 33, a one-dimensional image of a subject such as the finger 200 can be captured by the one-dimensional image sensor 4. Can do. Further, since no through hole is formed in the film substrate 33, the entire one-dimensional imaging device 4 is supported by the back surface 33 b of the film substrate 33 during mounting. Easy to mount to 33b.
[0064]
[Fourth embodiment]
Next, as shown in FIG. 6, an image input device 41 different from the image input device 1 will be described. About the image input device 41, the same code | symbol is attached | subjected to the component similar to the image input device 1 in 1st embodiment, and detailed description is abbreviate | omitted.
[0065]
An image input device 41 shown in FIG. 6 includes a film substrate 43 instead of the film substrate 13 shown in FIG. The difference between the film substrate 43 and the film substrate 13 is that the film substrate 13 blocks the optical path hole 7a of the holder 7 except for the through hole 13c, whereas the film substrate 43 partially blocks the optical path hole 7a. It is out.
[0066]
The film substrate 43 is attached to the rear side of the lower surface 7 b of the holder 7. And the film board | substrate 43 is extended to the optical path hole 7a toward the front. The film substrate 43 is Refractive index distribution type Avoiding the optical axis of the lens array 6, Refractive index distribution type The optical axis of the lens array 6 and the film substrate 43 do not intersect each other. Similar to the film substrate 13 of the first embodiment, the surface 43a of the film substrate 43 is Refractive index distribution type Opposite to the exit surface 6b of the lens array 6, the back surface 43b of the film substrate 43 is wired, and the terminals of the wiring and the bonding pads 12 are joined by the bumps 14, so that the front surface of the back surface 43b of the film substrate 43 is connected. A one-dimensional imaging device 4 is mounted on the edge.
[0067]
The light receiving unit 11 of the one-dimensional imaging device 4 extends forward from the front edge 43 c of the film substrate 43. And Refractive index distribution type When the film substrate 43 is viewed in the optical axis direction of the lens array 6, the light receiving unit 11 of the one-dimensional image sensor 4 is disposed in front of the front edge 43 c of the film substrate 43. The light receiving unit 11 Refractive index distribution type Arranged on the optical axis of the lens array 6; Refractive index distribution type The optical axis of the lens array 6 reaches the light receiving unit 11 without passing through the film substrate 43. Therefore, the reflected light reflected at the portion where the subject such as the finger 200 is in contact with the outer peripheral surface 2a of the rotary roller 2 is reflected. Refractive index distribution type A one-dimensional image is incident on the light receiving portion 11 of the one-dimensional image sensor 4 through the lens array 6 and a portion where the outer peripheral surface 2a of the rotating roller 2 is in contact with the finger 200 is formed. Refractive index distribution type An image is formed on the light receiving unit 11 by the lens array 6. The image input device 41 also has a circuit configuration as shown in FIG.
[0068]
In this image input device 41 as well as the image input device 1 of the first embodiment, since the one-dimensional imaging device 4 is mounted on the back surface 43b of the film substrate 43, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type Without shortening the focal length of the lens array 6, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 4 can be accommodated. Also, Refractive index distribution type Since the optical axis from the exit surface 6 b of the lens array 6 to the light receiving unit 11 avoids the film substrate 43, even if the one-dimensional imaging device 4 is mounted on the back surface 43 b of the film substrate 43, the primary object such as the finger 200 is used. The original image can be captured by the one-dimensional image sensor 4.
[0069]
[Fifth embodiment]
Next, as shown in FIG. 7, an image input device 51 different from the image input device 1 will be described. The image input device 51 includes a rotating roller 2, a housing 3, and a lens optical system. Refractive index distribution type A lens array 6 and a light irradiator 5 are provided. Rotating roller 2, Refractive index distribution type Since the lens array 6 and the light irradiator 5 are the same as those of the image input apparatus 1 shown in FIG. In the image input device 1 shown in FIG. 1, the holder 7 has a light irradiator 5, Refractive index distribution type Although the lens array 6 is attached, a holder (not shown) is supported by the image input device 51 (the holder is fixed to the housing 3 and is supported so as not to rotate even when the rotating roller 2 rotates. )), The light irradiator 5 and Refractive index distribution type The lens array 6 is fixed in the rotating roller 2.
[0070]
The image input device 51 includes a right-angle prism 57 as a reflection optical system, and the right-angle prism 57 is fixed in the rotating roller 2. The right-angle prism 57 is a triangular prism, and the ridge angle 57a is a right angle. The incident surface 57b facing the ridge angle 57a is Refractive index distribution type It faces the exit surface 6b of the lens array 6 and is parallel to the exit surface 6b. The two surfaces 57c and 57d sandwiching the ridge angle 57a are orthogonal to each other and form 45 ° with respect to the incident surface 57b. And one surface 57c is Refractive index distribution type The lens array 6 is inclined at 45 ° with respect to the exit surface 6b.
[0071]
Refractive index distribution type The light that has entered the entrance surface 57b from the exit surface 6b of the lens array 6 propagates through the right-angle prism 57 and enters the surface 57c. The light incident on the surface 57c is totally reflected forward on the surface 57c and incident on the surface 57d. The light incident on the surface 57d is incident on the surface 57d. Refractive index distribution type The light is totally reflected in a direction opposite to the light emitted from the lens array 6 and emitted from the incident surface 57b. In other words, the right-angle prism 57 is the surface 57c. Refractive index distribution type By bending the optical axis of the lens array 6 by 45 ° and further bending by 45 ° at the surface 57d, Refractive index distribution type Substantially parallel to the optical axis of the lens array 6 and Refractive index distribution type Light is emitted from the incident surface 57b in a direction opposite to the optical axis of the lens array 6.
[0072]
In addition, the image input device 51 includes a one-dimensional image sensor 54. The one-dimensional image sensor 54 also has a silicon substrate, a bonding pad, and a light receiving unit, like the one-dimensional image sensor 4 in the first embodiment. The one-dimensional image sensor 54 is mounted on the back surface 53b of the substrate 53. Unlike the one-dimensional image sensor 4 mounted by the COF method, the one-dimensional image sensor 54 is mounted on the substrate 53 by the wire bonding method. That is, the back surface 53b of the substrate 53 is wired, the one-dimensional imaging device 4 is mounted on the back surface 53b of the substrate 53, and the terminal of the wiring is connected to the bonding pad by the conductive wire. The light receiving portion of the one-dimensional image sensor 54 does not face the back surface 53 b of the substrate 53, and faces away from the back surface 53 b of the substrate 53.
[0073]
The substrate 53 and the one-dimensional image sensor 54 are arranged in the rotating roller 2, Refractive index distribution type It is fixed in front of the lens array 6. The back surface 53 b of the substrate 53 and the light receiving portion of the one-dimensional imaging element 54 face the incident surface 57 b of the right-angle prism 57. The light receiving portion of the one-dimensional image sensor 54 also has a structure in which photoelectric conversion elements are arranged in parallel to the axis of the rotating roller 2, similarly to the one-dimensional image sensor 4. In addition, the distance from the light receiving portion of the one-dimensional image sensor 54 to the incident surface 57b is Refractive index distribution type It is longer than the distance from the exit surface 6b of the lens array 6 to the entrance surface 57b.
[0074]
Refractive index distribution type The light emitted from the emission surface 6b of the lens array 6 is totally reflected by the surfaces 57c and 57d and emitted from the incident surface 57a. The optical axis of the light emitted from the incident surface 57a is received by the one-dimensional imaging element 54. I am in the club. Therefore, the one-dimensional image sensor 54 receives the light emitted from the incident surface 57b of the right-angle prism 57 by the light receiving unit. here, Refractive index distribution type The lens array 6 forms an image appearing on the outer peripheral surface 2a of the rotating roller 2 on the light receiving portion of the one-dimensional image pickup device 54 through the surface 57c and the surface 57d, and the one-dimensional image pickup device 54 displays the formed image. An image is picked up by the light receiving unit.
[0075]
Similar to the image input apparatus 1, the image input apparatus 51 has a circuit configuration as shown in FIG.
Similarly to the image input apparatus 1, when the image input device 51 rotates the rotating roller 2 with the subject such as the finger 200 pressed against the outer peripheral surface 2 a of the rotating roller 2, the object is output from the light guide prism 9. Line scanning is performed by the light emitted from 9b. The reflected light at the portion where the subject is in contact with the outer peripheral surface 2a of the rotating roller 2 is Refractive index distribution type The light enters the entrance surface 6a of the lens array 6 and exits from the exit surface 6b. And the light radiate | emitted from the output surface 6b injects into the incident surface 57b of the right-angle prism 57, is totally reflected by the surface 57c and the surface 57d, and radiate | emits from the incident surface 57b. Accordingly, the subject is line-scanned by the one-dimensional image sensor 54, and a one-dimensional image of the subject is captured by the one-dimensional image sensor 54. The one-dimensional images captured by the one-dimensional image sensor 54 are sequentially synthesized by the synthesis buffer 19 to generate two-dimensional image data.
[0076]
In the image input device 51 described above, even if the space in the rotating roller 2 is narrowed by reducing the diameter of the rotating roller 2, the space in the rotating roller 2 is reduced by bending the optical axis with the right-angle prism 57. It can be used effectively. Therefore, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type To satisfy the imaging formula without shortening the focal length of the lens array 6 Refractive index distribution type The distance from the lens array 6 to the one-dimensional image sensor 54 can be maintained. Therefore, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 54 can be accommodated in the rotating roller 2, and the image input device 51 can be reduced in size. Also, Refractive index distribution type Since the optical axis from the lens array 6 to the incident surface 57b of the right-angle prism 57 is parallel to the optical axis from the incident surface 57b to the one-dimensional imaging device 4, the one-dimensional image captured by the one-dimensional imaging device 4 is , Refractive index distribution type The image at the portion where the optical axis of the lens array 6 intersects the outer peripheral surface 2a of the rotary roller 2 is not reduced in a certain direction, Refractive index distribution type It is the same size as the image in the part which contacted the optical axis of the lens array 6 and the outer peripheral surface 2a of the rotating roller 2.
[0077]
[Sixth embodiment]
Next, as shown in FIG. 8, an image input device 61 different from the image input device 51 will be described. Although the image input device 61 includes the light irradiator 5, the light irradiator 5 illustrated in FIG. 7 is provided on the substrate 10, whereas the light irradiator 5 illustrated in FIG. It is provided on the surface 53a. That is, the light emitting element 8 is mounted on the surface 53 a of the substrate 53, and the light guide prism 9 is provided on the surface 53 a of the substrate 53 so as to cover the light emitting element 8. The exit surface 9b of the light guide prism 9 is Refractive index distribution type The lens array 6 is directed to a place where the optical axis of the lens array 6 intersects, and light emitted from the light emitting element 8 propagates through the light guide prism 9 and exits from the exit surface 9b toward the subject such as the finger 200. A circuit or the like for driving the light emitting element 8 may be provided on the substrate 10.
[0078]
Similar to the image input device 51 of the fifth embodiment, the image input device 61 bends the optical axis with a right-angle prism 57, thereby reducing the space in the rotating roller 2. Refractive index distribution type The optical path from the exit surface 6b of the lens array 6 to the one-dimensional image sensor 54 can be effectively used. Therefore, even when the diameter of the rotating roller 2 is shortened, Refractive index distribution type The lens array 6 and the one-dimensional image sensor 54 can be accommodated in the rotating roller 2, and the image input device 61 can be reduced in size. Furthermore, the one-dimensional image sensor 54 and the light emitting element 8 are mounted on the substrate 53. Therefore, the number of components in the rotating roller 2 is reduced by the amount of the substrate 10 shown in FIG. 7 in the image input device 61 as compared with the image input device 51. Therefore, the diameter of the rotating roller 2 can be shortened, and the image input device 61 can be further downsized as compared with the image input device 51.
[0079]
The image input device 61 is similar to the image input device 51 in that the rotating roller 2, the housing 3, Refractive index distribution type The image input device 61 includes a lens array 6, a synchronization signal generator 15, a driver circuit 16, a signal processing circuit 17, an A / D conversion circuit 18, a synthesis buffer 19, a one-dimensional imaging device 54, and a right-angle prism 57. The same reference numerals are given to the same components as those of the image input device 51 and the description thereof is omitted.
[0080]
[Seventh embodiment]
Next, as shown in FIG. 9, an image input device 71 different from the image input device 51 will be described.
As shown in FIG. 7, in the image input device 51, the light irradiator 5 is disposed in the rotating roller 2, whereas in the image input device 71, the light irradiator 75 is arranged in the rotating roller 2 as shown in FIG. Arranged outside. More specifically, the light irradiator 75 includes a light emitting element 78 and a light guide prism 79, and the light emitting element 78 and the light guide prism 79 are disposed outside the rotating roller 2 in the housing 3. Attached to the substrate 77.
[0081]
The surface 77a of the substrate 77 is Refractive index distribution type Opposite to the exit surface 6b of the lens array 6, the surface 77a of the substrate 77 and Refractive index distribution type Between the exit surface 6b of the lens array 6, the rotating roller 2 and the right-angle prism 57 are arranged.
[0082]
The light emitting element 78 is provided on the surface 77a of the substrate 77, and Refractive index distribution type It is arranged on the optical axis of the lens array 6. The light guide prism 79 is provided on the surface 77 a of the substrate 77 so as to cover the light emitting element 78. The incident surface 79 a of the light guide prism 79 faces the light emitting element 78, and the output surface 79 b of the light guide prism 79 is Refractive index distribution type It faces the exit surface 6b of the lens array 6. The light exit surface 79 b of the light guide prism 79 is elongated in the left-right direction along the axis of the rotating roller 2.
[0083]
The light guide prism 79 causes the light emitted from the light emitting element 78 to be incident on the incident surface 79a, propagates the incident light to the exit surface 79b, and emits the propagated light from the exit surface 79b. The light emitted from the emission surface 79b passes through the rotating roller 2, and Refractive index distribution type The light enters the surface 57c of the right-angle prism 57 in the direction opposite to the optical axis of the lens array 6, propagates through the right-angle prism 57, and exits from the incident surface 57b. The light emitted from the incident surface 57b is Refractive index distribution type Incident on the exit surface 6b of the lens array 6, Refractive index distribution type Propagating through the lens array 6, Refractive index distribution type The light exits from the incident surface 6 a of the lens array 6. Refractive index distribution type The light emitted from the incident surface 6a of the lens array 6 is Refractive index distribution type The light is incident on the rotating roller 2 so as to converge at the intersection of the optical axis of the lens array 6 and the rotating roller 2. Thereby, the finger 200 pressed against the outer peripheral surface 2a of the rotating roller 2 is irradiated in the image capturing window 3a.
[0084]
Similar to the image input device 51, the image input device 71 includes a rotating roller 2, a housing 3, Refractive index distribution type The image input device 71 includes a lens array 6, a synchronization signal generator 15, a driver circuit 16, a signal processing circuit 17, an A / D conversion circuit 18, a synthesis buffer 19, a one-dimensional imaging device 54 and a right-angle prism 57. The same reference numerals are given to the same components as those of the image input device 51, and the description thereof will be omitted.
[0085]
Similar to the image input device 51 of the fifth embodiment, the image input device 71 bends the optical axis with a right-angle prism 57, thereby reducing the space in the rotating roller 2. Refractive index distribution type The optical path from the exit surface 6b of the lens array 6 to the one-dimensional image sensor 54 can be effectively used. Furthermore, the light emitted from the light emitting element 8 is Refractive index distribution type It enters the finger 200 through the lens array 6, Refractive index distribution type The lens array 6 converges on the place where the finger 200 and the outer peripheral surface 2a of the rotating roller 2 are in contact with each other. Therefore, the finger 200 can be irradiated efficiently.
[0086]
The present invention is not limited to the above-described embodiments, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the first to fourth embodiments, instead of the film substrates 13, 23, 33, and 43, a non-film printed circuit board (for example, a plastic substrate, a glass substrate, a ceramic substrate, etc.) may be used. .
In the fifth to sixth embodiments, instead of the right-angle prism 57, a highly reflective mirror surface may be provided at a position and an angle corresponding to the surface 57c and the surface 57d.
In the first to seventh embodiments, Refractive index distribution type Instead of the lens array 6, a rod lens array in which a plurality of rod lenses are arranged in an array, a spherical lens, or other lenses may be provided. Even with these lenses, Refractive index distribution type Similar to the lens array 6, it has an imaging function.
In addition, the image input devices 31, 41, 51, 61, 71 in the second to seventh embodiments may be provided in the electronic apparatus similarly to the image input device 1, or may exist as a single unit. .
[0087]
【The invention's effect】
As described above, according to the present invention, since the imaging device is mounted on the back surface of the substrate, and the surface of the substrate is directed to the optical system, the imaging device is separated from the optical system by the thickness of the substrate. There is no substrate between the inner surface of the cylinder and the image sensor. Therefore, even when the diameter of the cylinder is shortened, the optical system and the image sensor can be accommodated in the cylinder without shortening the focal length of the optical system.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing an image input apparatus to which the present invention is applied.
2 is an enlarged side cross-sectional view of the one-dimensional imaging device shown in FIG. 1 and its periphery.
FIG. 3 is a block diagram showing a circuit configuration of the image input apparatus.
4 is a side sectional view showing an image input apparatus different from the image input apparatus shown in FIG. 1;
FIG. 5 is a side sectional view showing an image input apparatus different from the image input apparatus shown in FIGS.
FIG. 6 is a side sectional view showing an image input device different from the image input device shown in FIGS.
7 is a side sectional view showing an image input apparatus different from the image input apparatus shown in FIGS.
8 is a side sectional view showing an image input device different from the image input device shown in FIGS. 1, 4, 5, 6, and 7. FIG.
9 is a side sectional view showing an image input device different from the image input devices shown in FIGS. 1, 4, 5, 6, 7, and 8. FIG.
FIG. 10 is a side sectional view showing a conventional image input apparatus.
11 is a side cross-sectional view showing an enlarged view of the one-dimensional image sensor shown in FIG. 10 and its periphery.
[Explanation of symbols]
1, 21, 31, 41, 51, 61, 71 Image input device
2 Rotating roller (cylindrical)
2a Outer peripheral surface
4,54 One-dimensional imaging device (imaging device)
5,75 Light irradiator
6 Refractive index distribution type Lens array (optical system, lens optical system)
11 Light receiver
13, 23, 33, 43 Film substrate (substrate)
13a, 23a, 33a, 43a Surface
13b, 23b, 33b, 43b Back side
13c Through hole
43c Front edge (outer edge)
53 substrates
57 Right angle prism (optical system, reflective optical system)
57b Incident surface
57c surface (first total reflection surface)
57d surface (second total reflection surface)
200 fingers (subject)

Claims (1)

A transparent cylinder rotatably supported around an axis, and a cylinder that rotates by moving a finger in contact with its outer peripheral surface in a tangential direction;
A one-dimensional imaging device that is arranged in the cylinder and has a light receiving portion and acquires an image by receiving light at the light receiving portion;
A film substrate disposed in the cylinder and mounted with the one-dimensional imaging device;
A refractive index distribution type lens array that is disposed in the cylinder and forms a fingerprint image on a light receiving portion of the one-dimensional imaging device in a portion where the finger is in contact with the outer peripheral surface of the cylinder,
A holder fixedly arranged in the cylinder, wherein the gradient index lens array is attached to a through hole provided in the holder, and the one-dimensional imaging device is mounted below the through hole of the holder A holder to which the film substrate is attached;
A fingerprint image input device comprising:
The one-dimensional imaging device has a structure having a light receiving portion in which photoelectric conversion elements are arranged in a line on a silicon substrate, and the silicon substrate is bonded to input and output an electric signal on a surface where the light receiving portion exists. Have a pad,
The film substrate has a through hole formed at a position corresponding to the optical axis of the gradient index lens, and a bump as a wiring terminal on the back surface.
By bonding the bonding pad and the bump, the one-dimensional image sensor is fixed to the back surface of the film substrate so that the light receiving portion of the one-dimensional image sensor is located on the optical axis of the gradient index lens array. A fingerprint image input device.

Images