WO2004021278A1 - Element optique et dispositif de lecture - Google Patents

Element optique et dispositif de lecture Download PDF

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Publication number
WO2004021278A1
WO2004021278A1 PCT/JP2003/010834 JP0310834W WO2004021278A1 WO 2004021278 A1 WO2004021278 A1 WO 2004021278A1 JP 0310834 W JP0310834 W JP 0310834W WO 2004021278 A1 WO2004021278 A1 WO 2004021278A1
Authority
WO
WIPO (PCT)
Prior art keywords
reading
light
light beam
light source
source unit
Prior art date
Application number
PCT/JP2003/010834
Other languages
English (en)
Japanese (ja)
Inventor
Chihiro Ueki
Masato Nishizawa
Tomoyuki Tsurube
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2002246546A external-priority patent/JP2004086553A/ja
Priority claimed from JP2002246545A external-priority patent/JP2004086552A/ja
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Priority to AU2003261752A priority Critical patent/AU2003261752A1/en
Publication of WO2004021278A1 publication Critical patent/WO2004021278A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the present invention relates to an optical element and a reading device for reading information represented by shading such as characters and figures and information represented by unevenness such as a fingerprint.
  • an optical reading device is mounted on a portable information device, an image of a user's fingerprint pattern can be taken, and the image can be used to authenticate the user, and document information such as characters and graphics can be read by the reading device.
  • a technology capable of capturing images eg, Japanese Patent Laid-Open No. 2001-283207.
  • FIG. 21 is a diagram for explaining the operation principle of the conventional reading device.
  • an optical element 202 is provided so as to be in contact with a subject 201 such as a user's finger document.
  • a light source 203 is provided on the opposite side of the subject 201 with the optical element 202 interposed therebetween.
  • the light source unit 203 is arranged so as to be incident on the surface 202a of the optical element 202 which is to be in contact with the subject 201 at an incident angle of 0a.
  • the imaging element 204 is arranged at a position such that light incident on the optical element 202 from the light source unit 203 can receive a reflected light component on the surface 202a of the optical element 202 which should come into contact with the subject 201. I have. Note that the light receiving angle ⁇ b at this time is equal to the incident angle ⁇ a.
  • the conventional reading apparatus has an incident angle of 0 a (deg) and an angle at which total reflection occurs on a surface 202 a of the optical element 202 which should be in contact with the subject 201. Is the critical angle (deg),
  • document information expressed by shading of characters, figures, and the like is obtained by scattered light on a surface 202 a of the optical element 202 that should be in contact with the subject 201.
  • an image could be taken by reading the components in the image sensor 204 direction.
  • the reflected light component (corresponding to a concave portion) on the surface 202 a of the optical element 202 that should be in contact with the subject 201 can be read. I was able to take that image.
  • the light is incident on the surface to be brought into contact with the finger at an incident angle of 0 a less than the critical angle, so that the convex portion of the fingerprint contacts the optical element.
  • the convex portion of the fingerprint contacts the optical element.
  • light rays are scattered at the same time, and some light rays pass through the reading surface and are scattered at the concave parts of the fingerprint, and the scattered light enters the optical element again.
  • the contrast of a captured image is reduced. This made it difficult to analyze the captured fingerprint image and obtain the information necessary for personal authentication.
  • the present invention obtains an image with good contrast for both information represented by unevenness such as a fingerprint and information represented by shading such as characters and figures. It is an object of the present invention to provide an optical element and a reading device that can perform the reading.
  • the optical element of the present invention includes a first inclined surface that totally reflects the first light beam, a second inclined surface that totally reflects the second light beam, and a first inclined surface and a second inclined surface. Adjacent to the first light I, partially reflects the totally reflected light on the first inclined surface, reflects the second light totally reflected on the second inclined surface, and obtains optical information of the subject. It features a reading surface and a reading surface.
  • the reading device of the present invention includes a first light source unit, a second light source unit, a first inclined surface that totally reflects light rays from the first light source unit, A second inclined surface that totally reflects the light beam, and a light beam from the first light source unit that is adjacent to the first inclined surface and the second inclined surface and that is totally reflected on the first inclined surface and the second inclined surface.
  • a reading surface for reading optical information of a subject and a photographing unit for photographing scattered light on the reading surface are provided so that light rays from the second light source unit totally reflected on the inclined surface are incident. It is characterized by having.
  • the light rays from the first light source unit totally reflected on the first inclined surface are partially reflected on the reading surface, and partially reflected on the reading surface, and are reflected on the second inclined surface.
  • the light beam from the light source may be totally reflected on the reading surface.
  • optical axis direction of the light beam from the first light source unit may be parallel to the optical axis direction of the light beam from the second light source unit.
  • first light source unit, the second light source unit, and the imaging unit may be configured to be provided on the same substrate.
  • the light guide means may be provided in parallel with the optical axis direction of the light beam from the first light source unit and the optical axis direction of the light beam from the second light source unit.
  • the light guide means may be a GR IN lens array.
  • the configuration of the reading device of the present invention can be realized with a simple configuration.
  • the configuration may be such that the conjugate length of the GRIN lens array substantially matches the distance from the image sensor to the reading surface.
  • the conjugate length of the GRIN lens array substantially matches the distance from the image sensor to the tip of the protrusion, it is possible to more clearly photograph the document. Further, even when the reading surface is formed of a curved surface, it is possible to prevent the reading surface from being damaged by friction or the like.
  • the curved surface may be a concave surface.
  • the structure may be represented by:
  • the optical element of the present invention includes a first reading surface illuminated by the first light beam, a second reading surface illuminated by the second light beam, and scattered light on the first reading surface.
  • the first reading surface is a surface for reading information represented by the unevenness, and the light beam of the first light source irradiates the first reading surface in a substantially vertical direction. It may be a configuration.
  • the second reading surface is a surface for reading information represented by shading, and an angle at which a light beam of the second light source irradiates the second reading surface is smaller than the critical angle. Is also good.
  • first reading surface and the second reading surface may be configured to be perpendicular to each other. According to such a configuration, when the optical element is mounted on an information device or the like, images having two attributes can be photographed on different surfaces, so that the optical element can be provided for convenience for the user. Becomes possible.
  • the light collecting means may be a G RIN lens.
  • the reading device of the present invention includes a first light source unit, a second light source unit, a first reading surface illuminated by the first light source unit, and a first light source illuminated by the second light source unit.
  • a reading device capable of capturing information having two different attributes: information represented by unevenness such as a fingerprint and information represented by shading such as characters and figures. can do.
  • optical path length from the imaging surface of the imaging element to the first reading surface may be equal to the optical path length from the imaging surface of the imaging unit to the surface where the subject is to be arranged.
  • optical path length from the photographing surface of the photographing unit to the first reading surface and the optical path length from the photographing surface force of the photographing unit to the surface on which the subject is to be arranged are equal to the conjugate length of the light collecting means. Is also good.
  • the information to be read on the first reading surface may be fingerprint information
  • the information on the subject to be read on the second reading surface may be document information.
  • an information device is an information device including the above-described reading device and a housing for housing the reading device, wherein the surface on which the subject is to be placed is in contact with the housing and the subject. It is characterized by the fact that it coincides with the surface to be covered.
  • an information device capable of authenticating a user by reading a fingerprint and reading document information such as a URL and a two-dimensional bar code. Also, when reading document information, by bringing the housing into contact with the subject, an in-focus and good image can be taken. Further, since the reading device of the present invention is mounted, an information device which can be made thin can be provided. Further, since the second reading surface of the reading device can be formed inside the outermost surface of the housing of the information device, it is possible to prevent and protect the second reading surface from being damaged.
  • the use of the optical element and the reading device of the present invention makes it possible to use a concave part such as a fingerprint.
  • a good contrast image can be obtained for both the information represented by the projections and the information represented by the shades of characters and figures, and the thickness can be reduced.
  • FIG. 1 is a cross-sectional view illustrating a configuration of the reading device according to the first embodiment of the present invention.
  • FIG. 2A is a perspective view illustrating a configuration of the reading device according to the first embodiment of the present invention.
  • FIG. 2B is a plan view showing a configuration of the reading device according to the first embodiment of the present invention.
  • FIG. 3 is a diagram for explaining an operation when the reading device according to the first embodiment of the present invention captures information represented by unevenness.
  • FIG. 4 is a diagram for explaining an operation when the reading device according to the first embodiment of the present invention captures information represented by shading.
  • FIG. 5A is a front view showing a configuration of a mobile phone device equipped with the reading device according to the first embodiment of the present invention.
  • FIG. 5B is a perspective view of a main part of a portion of the mobile phone device according to the first embodiment of the present invention, on which a reading device is mounted.
  • FIG. 6 is a cross-sectional view of a main part of a portion of the mobile phone device according to the first embodiment of the present invention, on which a reading device is mounted.
  • FIG. 7 is a cross-sectional view illustrating a configuration of a reading device according to the second embodiment of the present invention.
  • FIG. 8 is a cross-sectional view illustrating a configuration of the reading device according to the third embodiment of the present invention.
  • FIG. 9 is a schematic perspective view showing the configuration of the reading device according to the third embodiment of the present invention.
  • FIG. 10 is a cross-sectional view illustrating a configuration of a reading device according to the fourth embodiment of the present invention.
  • FIG. 11 is a perspective view showing a configuration of a reading device according to a fourth embodiment of the present invention. is there.
  • FIG. 12 is a diagram for explaining an operation when the reading device according to the fourth embodiment of the present invention reads information represented by shading.
  • FIG. 13 is a diagram for explaining an operation when the reading device according to the fourth embodiment of the present invention reads information represented by tetraconvex.
  • FIG. 14 is a cross-sectional view illustrating another configuration of the reading device according to the fourth embodiment of the present invention.
  • FIG. 15 is a cross-sectional view illustrating another configuration of the reading device according to the fourth embodiment of the present invention.
  • FIG. 16 is a sectional view showing another configuration of the reading device according to the fourth embodiment of the present invention.
  • FIG. 17 is a perspective view showing the configuration of the reading device according to the fifth embodiment of the present invention.
  • FIG. 18 is a cross-sectional view illustrating a configuration of a reading device according to the fifth embodiment of the present invention.
  • FIG. 19 is a perspective view showing the configuration of the reading device according to the sixth embodiment of the present invention.
  • FIG. 20 is a plan view showing the configuration of the reading device according to the sixth embodiment of the present invention.
  • FIG. 21 is a diagram for explaining the configuration of a conventional reading device. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a cross-sectional view illustrating a configuration of the reading device according to the first embodiment of the present invention.
  • FIG. 2 (a) is a perspective view showing the appearance
  • FIG. 2 (b) is a plan view.
  • the X, Y, and Z axes are shown for simplicity.
  • a reading device 1 of the present embodiment has a first LED 13 provided.
  • a first substrate 11, an image sensor 32 and a second LED 14 are provided, a second substrate 12 bonded to the first substrate 11, an optical element described later, And cover members 28 to 31 for preventing light from leaking from the optical element in order to prevent light from leaking.
  • the imaging element 32 a known sensor such as a CMOS sensor or a CCD sensor can be used. In the present embodiment, a CMOS sensor having 256 ⁇ 16 pixels is used.
  • the reading device 1 includes, as an optical element, a light guide unit 17 (conducting a light beam from the first LED 13 to the prism unit 18) made of a known optical material such as highly transparent acrylic, polycarbonate, and glass.
  • first light guide means light guide means
  • second light guide means light guide means
  • third light guide means second LED Light guide means 22
  • fourth light guide means fourth light guide means
  • the first light guide means 17 has a total reflection surface 40 on the emission side (left side in FIG. 1).
  • the angle ⁇ formed by the total reflection surface 40 with respect to the traveling direction of the light beam is 45 °. I have.
  • the direction of light rays such as a light guide plate such as a linear Fresnel, a diffuser plate, or a diffraction grating is changed from the X-axis direction to the ⁇ -axis direction in FIG.
  • a means for distributing light to the light source may be used.
  • a prism unit 18 having an unevenness reading surface 33 on which a subject, for example, a finger is to be brought into contact, for capturing information having unevenness such as a fingerprint or Braille, and shading of a character or a figure.
  • a document reading unit 21 made of a known optical material such as highly transparent plastic, which is to face a subject, for example, a document when the information represented by is captured, is provided.
  • the reader 1 has a refractive index distribution type lens (hereinafter, referred to as a GRIN lens) made of a known optical material such as highly transparent plastic, which has a light condensing action for condensing light rays on the image sensor 32.
  • a total reflection means 24 having a total reflection surface coated with a total reflection so as to bend the optical path.
  • the total reflection means 24 is formed on the first substrate 11 by a known method such as bonding. JP2003 / 010834
  • the prism portion 18 and the second light guiding means 19 are configured so as to maintain optical close contact.
  • a half mirror 25 is provided between the second light guiding means 19 and the fourth light guiding means 20 so as to have an angle (J3) of 67.5 ° with respect to the X-axis direction in FIG. Is formed.
  • the second light guide means 19 and the GRIN lens 23 are also bonded so as to maintain optical close contact. Further, it is desirable that the document reading section 21 and the fourth light guide means 20 be bonded so as to maintain optical close contact in order to increase transmittance.
  • the interface between the first light guide means 17 and the GR IN lens 23, and the GR IN lens 23, the second light guide means 19, the fourth light guide means 20, and the third light guide means 22 It is desirable that the interface that contacts with be painted black so as to prevent light leakage.
  • cover members 28 to 31 are made of a known member such as plastic or rubber.
  • the force-par members 28 to 31 are desirably made of a material having a function of absorbing light or a black material.
  • light condensing sections 15 and 16 having a condenser function such as a Fresnel lens for condensing light rays are provided. May be. This makes it possible to effectively collect light rays from the first LED 13 and the second LED 14.
  • the width of the concave / convex reading surface 33 in the X-axis direction and the width of the document reading unit 21 in the Y-axis direction correspond to the size of the document or finger.
  • information that is narrow and has irregularities such as fingerprints, and information that has shading such as characters and figures is continuously photographed, and the entire image is photographed by combining these images. .
  • the operation of the reading device 1 of the present embodiment will be described. In the following, for simplicity of description, the light rays will be described using light rays centered on the optical axis. FIG.
  • FIG. 3 is a diagram for illustrating the operation of the reader 1 when capturing an image of information represented by unevenness such as a fingerprint. Note that the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
  • the first LED 13 lights up.
  • the light beam from the first LED 13 is collected by the light collector 15 and enters the first light guide 17.
  • the light beam incident on the first light guide means 17 travels straight through the first light guide means 17 in the X-axis direction in FIG. 3, and the left side of the first light guide means 17 in FIG.
  • the light is totally reflected by the total reflection surface 40 provided on the prism 18 and is incident on the prism portion 18 substantially vertically (Y-axis direction in FIG. 3).
  • the light beam that has entered the prism portion 18 is emitted from the convex reading surface 33 which is the emission surface of the prism portion 18.
  • the component in the ⁇ -direction in FIG. 3 with respect to the vertical direction of the uneven reading surface 33 out of the light beam scattered by the portion where the finger 63 is in close contact with the uneven reading surface 33, that is, the convex portion of the fingerprint, is a prism.
  • the light passes through the second light guide means 19 from the portion 18 and is reflected by the half mirror 25.
  • the light beam reflected by the half mirror 25 is condensed by the GRIN lens 23, is totally reflected by the total reflection means 24, and then enters the image sensor 32.
  • ⁇ is 45 °, but ⁇ is desirably equal to or larger than the critical angle of the members constituting the prism portion 18.
  • the convex ridge portion of the fingerprint is photographed in white (high luminance), and the valley line of the concave surface is photographed in black (low luminance).
  • the surface of the prism section 18 shown in FIG. As described above, for example, by applying black paint, the part A where the finger 63 does not come into contact with the unevenness reading surface 33 is photographed in black on the side A, so that a fingerprint with excellent contrast, etc. An image composed of irregularities can be obtained.
  • FIG. 4 is a diagram for explaining an operation when the reader according to the first embodiment of the present invention captures information represented by shading such as characters and figures.
  • the second LED 14 is turned on when capturing information represented by shading.
  • the light beam emitted from the second LED 14 is collected by the light collector 16 and enters the third light guide 22.
  • the light beam incident on the third light guide means 22 is refracted upward in FIG. 4 by the action of the refraction surface 27 provided on the exit side (the left side in FIG. 4) of the third light guide means 22. It is emitted.
  • the light beam emitted from the third light guide means 22 passes through the document reading section 21 and is emitted from the reading device 1.
  • the angle 27 needs to be changed depending on the distance from the document, and the angle can be appropriately designed so that the light beam is irradiated on the position on the document where the reading is to be performed.
  • the light is absorbed in the portion printed in black, that is, in the dark and light portions.
  • light is diffusely reflected in the white portion, that is, the light and dark portions.
  • the half mirror 25 since the half mirror 25 is used, a configuration in which light beams from two different directions are distributed in the same direction can be realized.
  • the reflected light from the camera can be controlled so that it is incident on one optical system (GR IN lens).
  • GR IN lens optical system
  • the two optical paths, that is, the first light guiding means 17 and the third light guiding means 22, and the optical axis of the GR IN lens 23 in parallel the reading apparatus 1 in the Y-axis direction can be further improved. Thinning can be performed.
  • the conjugate length of the GRIN lens 23 and the optical path length of the two optical paths are made equal in order to capture reflected light from two different surfaces. The details will be described below.
  • P 1 is the optical axis center point of the light beam illuminating the uneven reading surface 33
  • P 2 is the optical axis center point of the light beam illuminating the subject to be read (document 34)
  • P 3 is incident on the image sensor 32
  • P4 is the optical axis center point of the light beam entering the half mirror 25.
  • the conjugate length TC of the GRIN lens 23 in the reader 1 according to the present embodiment was 10.2 mm (for a light source of 570 nm).
  • the optical path length for the two optical paths is the GR IN lens 23 Is configured to be equal to the conjugate length of the document 34.
  • the information by the 00 convex such as the touched fingerprint and the like, it is possible to capture a clear image with good focus and good contrast.
  • the deviation between the conjugate length of the GR IN lens 23 and the two optical path lengths is within the depth of field of the conjugate length of the GR IN lens 23, that is, for example, about ⁇ 0.5 mm. If there is a deviation, there is no practical problem.
  • the wavelength of the first LED 13 and the second LED 14 are made different from each other, and the wavelength of the prism section 18 and the second light guide means 19 are different.
  • a band-pass filter having a wavelength corresponding to the first LED 13 is disposed between the original reading unit 21 and the fourth light guiding means 20, or between the original reading unit 21 and the fourth light guiding means 20. If a band-pass filter having a wavelength corresponding to the second LED 14 is disposed between the half mirror 25 and the second LED 14, a good contrast with a low influence of external light and stray light can be obtained. It is possible to obtain an image of the information represented by the information and an image of the information represented by the unevenness.
  • the information to be read is switched by the light source to be turned on, that is, the first LE. JP2003 / 010834
  • the reading device 1 of the present embodiment is configured such that a force is perpendicular to the unevenness reading surface 33 and the surface of the document reading portion 21.
  • a force is perpendicular to the unevenness reading surface 33 and the surface of the document reading portion 21.
  • FIG. 5 shows an example in which such a reading device 1 is mounted on an information device such as a mobile phone device.
  • FIG. 5 is an external view of a mobile phone device 50 equipped with the reading device 1.
  • FIG. 5 (a) is a front view thereof
  • FIG. 5 (b) is a main portion showing an end portion where the reading device 1 is mounted. It is a perspective view.
  • the mobile phone device 50 has a reading device 1 incorporated in a known mobile phone device such as an antenna unit 51, a speaker unit 52, a display unit 53 such as an LCD, a key unit 54, and a microphone unit 55. Configuration.
  • a portion including the concave / convex reading surface 33 of the prism portion 18 and the document reading portion 21 are exposed outside the mobile phone device 50.
  • the document reading unit 21 is configured to be located inside the housing of the mobile phone device 50.
  • FIG. 6 is a cross-sectional view of a main part of a portion where the reading device 1 of the mobile phone device 50 is mounted.
  • the reading device 1 is housed in the housing 43 of the mobile phone device 50, and as described above, the portion including the unevenness reading surface 33 of the prism portion 18 and the document reading portion 21 are connected to each other. Is exposed.
  • the outer surface of the housing 43 is configured to be located at a position coincident with one conjugate point P2 of the GRIN lens 23 of the reader 1, the original 34 is attached to the housing 43. The image of the original 34 can be taken by contacting the outer surface. With such a configuration, the focus of the document 34 is fixed, so that a stable, focused, high-contrast image can be taken, and the document reading unit 21 is prevented from being damaged. It becomes possible.
  • the prism portion 18 is configured to slightly protrude from the outer surface of the housing 43 of the mobile phone device 50.
  • HI 3.85 mm.
  • a surface for reading unevenness such as a fingerprint and a surface for reading information represented by shading such as characters and figures can be provided separately.
  • a user-friendly information device can be provided. As shown in FIG. 5, a surface for reading information represented by unevenness such as a fingerprint is formed on a surface on which the operation of the mobile phone device 50 is performed, and characters, figures, and the like are formed on a lower surface of the mobile phone device 50.
  • an information device equipped with such a reading device it is possible to perform personal authentication based on the fingerprint information of the user and to read document information such as a URL and a two-dimensional bar code. It is possible to provide an information device having multifunction and high security that has not existed in the past.
  • FIG. 7 is a cross-sectional view illustrating a configuration of the reading device according to the second embodiment of the present invention.
  • the method of reading information represented by shading, such as characters and figures, in the reading device 61 of the present embodiment is as shown in the first embodiment, and a description thereof will be omitted.
  • the reader 61 differs from the reader 1 described in the first embodiment in the method of reading information represented by unevenness such as a fingerprint.
  • the concave and convex portions are read.
  • the reading surface 33 was irradiated with light in the vertical direction to detect scattered light at the portion where the convex surface such as a fingerprint and the uneven reading surface 33 were in contact.
  • the unevenness reading of the prism portion 18 is performed.
  • the light emitted from the first LED 13 is condensed via the light condensing section 15 and enters the first light guide means 67 supported by the support member 69.
  • the first light guide means 67 the light beam goes straight in the X-axis direction in FIG. 7 , and is totally reflected by the total reflection surface 90 before entering the prism portion 18.
  • the total reflection surface 9 since 2 2.
  • uneven reading surface 33 is incident at an angle of 45 °.
  • the light enters the concave / convex reading surface 33 at an incident angle equal to or greater than the critical angle (about 41 ° in the case of BK 7). , All rays are totally reflected and enter the surface indicated by D in the lower left of FIG.
  • D By configuring the surface indicated by D to absorb light, for example, by painting it in black, light rays are absorbed on the D surface.
  • the half mirror 85 is formed so as to form an angle of 45 ° with respect to the X-axis direction in FIG.
  • a known material such as plastic or rubber can be used as the support member 70.
  • the reading device 61 of the present embodiment has a conjugate length of the GRIN lens 23 and an optical path for capturing information represented by unevenness.
  • the optical path length is equal when capturing information represented by length and shading 10834
  • the configuration is as follows. That is, in FIG. 7, the optical path length from the point P1 on the unevenness reading surface 33 to the point P3 on the image sensor 32 via the point P4 on the half mirror 85 surface and the original 34 And the optical path length from the point P 2 to the point P 3 on the image sensor 32 via the point P 4 on the half mirror 85 surface and the conjugate length of the GRIN lens 23 have the same relationship. .
  • the deviation between the two optical path lengths and the conjugate length of the GRIN lens 23 is about ⁇ 0.5 mm, for example, within the depth of field.
  • information having two different attributes that is, information represented by shading such as characters and figures and information represented by unevenness such as fingerprints, can be obtained with good contrast.
  • Image information can be obtained.
  • the information to be read can be easily switched by switching the light source to be turned on, that is, the first LED 13 and the second LED 14.
  • FIG. 8 is a cross-sectional view illustrating a configuration of the reading device according to the third embodiment of the present invention.
  • FIG. 9 is a schematic perspective view thereof.
  • the reader 71 is configured such that a light guide is used instead of the position where the LED is arranged and the first light guide 17 and the third light guide 22. This is different from the reading device 1 of the first embodiment and the reading device 61 of the second embodiment. As shown in FIG. 9, the first LED 96 and the second LED 97 are attached to the side surface of the reader 71, and are configured to irradiate light rays in the Z-axis direction in the figure.
  • the first LED 96 is irradiated.
  • the direction of the light beam irradiated in the Z-axis direction is changed by the light guide 93 in the Y-axis direction.
  • the light guide 93 a known diffusion plate, a light guide plate, a diffraction grating, or the like used for an LCD display or the like can be used.
  • the light beam whose direction has been changed in the Y-axis direction by the light guide 93 is PT / JP2003 / 010834
  • the prism section 18 is supported by a support member 92.
  • a known material such as plastic rubber can be used.
  • the second LED 97 is irradiated. 8 and 9, the light beam irradiated in the Z-axis direction is changed in the X-axis direction by a light guide 94, and is refracted downward in FIG. 8 by a light distribution means 95 such as a linear Fresnel. Then, the original 34 is irradiated. The scattered light on the document 34 is condensed by the GRIN lens 23 and photographed by the image sensor 32. This is the same as the operation of the reader 1 of the first embodiment and the operation of the reader 61 of the second embodiment.
  • the light guide 94 a known diffusion plate, light guide plate, diffraction grating, or the like, which is used for an LCD display or the like, can be used.
  • the reading device 71 of the present embodiment similarly to the reading device 1 of the first embodiment and the reading device 61 of the second embodiment, it is possible to express characters and figures with light and shade. It is possible to capture both the represented information and the information represented by unevenness such as a fingerprint.
  • the reading device 71 of the present embodiment further employs a configuration in which an LED is arranged on a side surface of the device and a light guide is used without using the first light guiding means and the third light guiding means. It is possible to realize a thin information device.
  • L 9.95 mm
  • HI 3.85 mm
  • H2 2.7 mm
  • positioning and the like can be easily performed when the reader 71 is mounted on an information device such as a mobile phone device. Configuration can be realized.
  • FIG. 10 is a cross-sectional view illustrating a configuration of a reading device according to the fourth embodiment of the present invention.
  • FIG. 11 is a perspective view thereof.
  • a reading device 101 of the present embodiment is configured such that a first light source unit 102 such as an LED and a second light source unit 103 on an identical substrate 111 are provided.
  • An image sensor 111 such as a CMOS or a CCD.
  • the optical element 113 includes a first light guide 104 and a second light guide 109 made of a transparent optical material, and further includes a prism 105.
  • the optical elements 113 are all formed of acrylic.
  • a light source is provided between the first light source, the unit 102 and the first light guide unit 104 and between the second light source unit 103 and the second light guide unit 109. It may have a configuration in which a condenser optical system such as a condenser lens or a Fresnel lens is provided to collect light from the unit.
  • a condenser optical system such as a condenser lens or a Fresnel lens
  • the prism unit 105 includes a first inclined surface 106 that totally reflects the light beam emitted from the first light source unit 102, and a light beam emitted from the second light source unit 103. And a second inclined surface 107 for total reflection. Further, the prism unit 105 has a reading surface 108 used for reading a document or a fingerprint between the first inclined surface 101 and the second inclined surface 107. It is.
  • the first inclined surface 106 force S and the optical axis direction of the light beam from the first light source unit 102 (the X-axis direction in FIG. 10)
  • the angle ⁇ is 15 It is configured to be.
  • the angle formed by the second inclined surface 107 with respect to the optical axis direction of the light beam from the second light source unit 103 (the X-axis direction in FIG. 10) is 22.5 °. It is configured as follows.
  • third light guide means 110 is provided so that the image sensor 111 receives the scattered light scattered on the reading surface 108. Has been.
  • the third light guiding means 110 as an example of the third light guiding means 110, a configuration using a plurality of cylindrical refractive index distribution type lenses, that is, GRIN (GR adient IN dex) lens arrays is shown. And the focal point, that is, the conjugate length, which is the distance between the conjugate points, is almost the same as the length from the imaging surface of the image sensor 111 to the reading surface 108. It is configured to be.
  • the conjugate length of the reader 101 of the present embodiment is about 10.2 mm.
  • the width of the reader 101 in the Y-axis direction is 16 mm.
  • FIG. 12 is a schematic diagram for explaining the operation of the reading device of the present embodiment when capturing information represented by shading.
  • the first light source unit 102 emits light.
  • the light beam from the first light source section 102 passes through the first light guide 104 and enters the prism section 105. Since the first light guiding means 104 and the prism portion 105 are closely adhered to each other by an adhesive or the like so that no optical gap is generated, the first light guiding means 104 and the prism portion 1 are connected to each other. No refraction occurs at the interface with 05.
  • the incident angle is 30. Therefore, total reflection does not occur, and the light beam exits from the reading surface 108 to the outside.
  • the light emitted from the reading surface 108 enters the surface of the original 121 such as a character or a figure arranged near the reading surface 108, and the color of the character or the figure is light, that is, a white portion. Are scattered, and are absorbed in the areas where the coloring is deep, that is, in the black areas. A part of the scattered light scattered by the white portion of the original 121 enters the reading device 101 again from the reading surface 108. Then, the component of the scattered light heading toward the image sensor 111 is The light is condensed by the third light guide means 110 and is brightly photographed by the image pickup device 111.
  • the black portion of the original 121 is darkly photographed by the image sensor 111.
  • FIG. 13 is a schematic diagram for explaining the operation of the reading device of the present embodiment when capturing information represented by unevenness.
  • the second light source unit 103 emits light.
  • the light beam from the second light source unit 103 passes through the second light guide unit 109 and enters the prism unit 105. Since the second light guide means 109 and the prism portion 105 are closely adhered by bonding or the like so that no gap is generated optically, the second light guide means 109 and the prism portion 1 No refraction or reflection occurs at the interface with 05.
  • the angle of incidence exceeds the critical angle of 45 °, so that the light is totally reflected and does not go out of the reader 101 (exit from acrylic to the air)
  • the critical angle in this case is about 42 °).
  • the reader 101 makes it possible for the reader 101 to capture not only information represented by shading such as characters and figures but also information represented by unevenness such as fingerprints.
  • the concave portion when the fingerprint pattern is photographed is totally reflected in a direction other than the image sensor on the light reading surface, so that the black level is lower than in the past. An image with good contrast can be obtained.
  • the angle ⁇ formed by the first inclined surface 106 and the optical axis (X-axis) of the light beam from the first light source unit 102 is 15 °. Indicated. According to the examination, the angle ⁇ is an angle at which the incident angle on the first inclined surface 106 causes the total reflection, that is, an angle equal to or larger than the critical angle, and is incident on the reading surface 108. The angle is preferably an angle that does not cause total reflection, that is, an angle smaller than the critical angle. That is, if the critical angle is R,
  • the angle iS is an angle at which the angle of incidence on the second inclined surface 107 causes an angle of total reflection, that is, an angle equal to or greater than the critical angle R, and the angle of incidence on the reading surface 108 also cause total reflection It is desirable that the angle be equal to or larger than the critical angle. That is,
  • the first light source unit 102 when the object to be read is information expressed in shades, the first light source unit 102 may be turned on to take an image, and the object to be read may be uneven. If the information is represented by the following, the second light source unit 103 may be turned on to take an image. In other words, with a simple configuration of selecting a light source unit to be turned on, information represented by shading such as characters and figures and information represented by irregularities such as fingerprints are photographed from the same reading surface 108 with good contrast. be able to.
  • the optical axis of the light beam from first light source unit 102, the optical axis of the light beam from second light source unit 103, and imaging element 111 from reading surface 108 are configured so that the optical axis of the light beam to the light is substantially parallel.
  • the thickness of the reading device 101 can be reduced.
  • the thickness in the ⁇ -axis direction in the figure could be reduced to 3 mm.
  • the present invention is not limited to this.
  • the imaging element is formed on the same substrate as the first light source unit and the second light source unit.
  • the reader can be easily assembled.
  • the present invention does not limit the position of the image sensor.
  • the image pickup device 1 1 1 may be configured not to be on the same substrate as the first light source unit 102 and the second light source unit 103. Mona Re.
  • the present invention is not limited to this, and an optical system having a light condensing function is provided. If this is the case, it goes without saying that it is included in the present invention.
  • the conjugate length of the GRIN lens array which is the third light guiding means 110
  • the conjugate length of the third light guide means 110 may be a length exceeding the image sensor 111 and the reading surface 108.
  • the reading surface 108 is smaller than the casing 130 of the portable information device. It becomes possible to arrange the reader 101 so as to be inside. In this case, it is desirable to arrange the third light guide means 110 so that the conjugate length of the third light guide means 110 matches the distance C from the image pickup device 111 to the outside of the housing 130. With such a configuration, the reading surface 108 can be protected from external mechanical damage or the like.
  • the optical element 113 includes the first light guide 104, the second light guide 109, and the prism 105. It is not limited to the configuration consisting of For example, as shown in FIG. 16, a configuration in which the optical element 15 1 force S, the first light guide means, the second light guide means, and the prism section are integrally formed by a known method such as press molding. It goes without saying that this may be the case.
  • FIG. 17 is a perspective view of a reading device according to the fifth embodiment of the present invention.
  • FIG. 18 is a sectional view thereof.
  • the reading device 16 1 of the present embodiment is different from the reading device 101 described in the fourth embodiment in that both sides of the reading surface 108 are provided (both sides in the Y-axis direction in FIG. 17). The difference is that a projection 14 2 is provided.
  • the reading surface 108 does not come into direct contact with the original to be read, so that the surface can be protected from surface damage due to friction or dust. Can be.
  • a fingerprint image can be obtained at the central portion of the reading surface 108 without the projections 142.
  • the conjugate length of the third light guiding means 110 is almost the same as the distance E from the image pickup device 111 to the tip of the protrusion 142, as shown in characters and figures. This is desirable for capturing clearer images of information represented by shading such as shapes. Furthermore, in order to clearly capture information represented by irregularities such as fingerprints, the depth of field, the distance D from the image sensor 111 to the reading surface 108, and the image sensor 111 It is desirable to cover the distance E from the front end of the projection 142 to the tip of the projection 142.
  • FIG. 19 is a perspective view of a reading device according to the sixth embodiment of the present invention.
  • FIG. 20 is a plan view thereof.
  • the reading device 16 2 of the present embodiment is different from the reading device 101 described in the first embodiment in that both ends of the reading surface 1 48 in the Y-axis direction are curved surfaces. The difference is in the configuration.
  • the surface Since it does not directly contact the original, the surface can be prevented from being scratched due to friction or dust.
  • the Y of the reading surface 1 48 is not provided.
  • the entire area in the axial direction can be used as the reading surface.
  • the conjugate length of the third light guide means 110 is almost the same as the maximum distance G from the image pickup device 111 to the reading surface 148.
  • This is desirable for capturing clearer images of information represented by light and shade, such as characters and figures.
  • the depth of field of the GRIN lens is set to the maximum distance G from the image sensor 111 to the reading surface 144, the image sensor 1 It is desirable to cover from 1 1 to the shortest distance F of the reading surface 1 4 8.
  • the reading device 162 of the present embodiment the case where the reading surface 148 is concave in the Y-axis direction is shown, but the reading device 162 of the present invention is not limited to this. For example, it goes without saying that even a concave surface in the Z-axis direction has the effect of preventing damage. Industrial applicability
  • the optical element and the reading device provide an image with good contrast for both information represented by irregularities such as fingerprints and information represented by shading such as characters and figures. It is possible to read information represented by shading, such as characters and figures, and information represented by unevenness, such as fingerprints. It is useful as an optical element and a reading device for performing.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un élément optique comprenant une première face inclinée destinée à réfléchir totalement des premiers rayons lumineux, une seconde face inclinée destinée à réfléchir totalement des seconds rayons lumineux, ainsi qu'une face de lecture adjacente à la première face inclinée et à la seconde face inclinée et permettant de réfléchir une partie de la lumière de réflexion totale sur la première face inclinée, de réfléchir totalement la lumière de réflexion totale sur la seconde face inclinée, et de lire les informations optiques d'un objet à lire.
PCT/JP2003/010834 2002-08-27 2003-08-27 Element optique et dispositif de lecture WO2004021278A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003261752A AU2003261752A1 (en) 2002-08-27 2003-08-27 Optical element and reading device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002-246545 2002-08-27
JP2002246546A JP2004086553A (ja) 2002-08-27 2002-08-27 光学素子および読取装置
JP2002246545A JP2004086552A (ja) 2002-08-27 2002-08-27 光学素子および読取装置
JP2002-246546 2002-08-27

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WO2004021278A1 true WO2004021278A1 (fr) 2004-03-11

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TW (1) TW200403596A (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2946774A1 (fr) * 2009-06-16 2010-12-17 Sagem Securite Dispositif d'imagerie a element prismatique.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000048494A (ja) * 1998-07-27 2000-02-18 Toshiba Corp ディスク記憶装置及び同装置におけるサーボセクタアドレスエラー検出方法
WO2000022565A1 (fr) * 1998-10-09 2000-04-20 Kinetic Sciences Inc. Appareil de saisie optique d'image d'empreintes digitales
JP2001250112A (ja) * 2000-03-07 2001-09-14 Seiko Instruments Inc 画像読取り装置及び方法およびその応用装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000048494A (ja) * 1998-07-27 2000-02-18 Toshiba Corp ディスク記憶装置及び同装置におけるサーボセクタアドレスエラー検出方法
WO2000022565A1 (fr) * 1998-10-09 2000-04-20 Kinetic Sciences Inc. Appareil de saisie optique d'image d'empreintes digitales
JP2001250112A (ja) * 2000-03-07 2001-09-14 Seiko Instruments Inc 画像読取り装置及び方法およびその応用装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2946774A1 (fr) * 2009-06-16 2010-12-17 Sagem Securite Dispositif d'imagerie a element prismatique.
WO2010146290A1 (fr) * 2009-06-16 2010-12-23 Morpho Dispositif d'imagerie a element prismatique
US8811690B2 (en) 2009-06-16 2014-08-19 Morpho Imaging device having a prismatic element

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AU2003261752A1 (en) 2004-03-19

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