JP4775388B2 - Authentication apparatus and authentication method - Google Patents

Description

  The present invention detects a reproduction light from a hologram recording medium by irradiating an information laser beam based on the specific information owned by the user to the hologram recording medium in which data based on the specific information such as biometric information is recorded, The present invention relates to an authentication apparatus and an authentication method for authenticating a user who owns specific information.

  Conventionally, a security system authenticates a user. At that time, the user is authenticated by specific information (hereinafter referred to as specific information) possessed by each individual body such as a fingerprint, an iris, and a face. This system is used as an authentication system that is less prone to crime. In this authentication system, the amount of data handled is overwhelmingly larger than that of an encryption code or the like, so that a large amount of data needs to be recorded or stored.

  Therefore, for example, as introduced in a research example of Non-Patent Document 1, a hologram recording medium is irradiated with an information laser beam based on specific information and a reference laser beam having no information, and a large amount of data is obtained by a shift multiplexing method. The recorded light is irradiated with information laser light based on specific information obtained from a specific individual at the location where the data is recorded, and the intensity of the reproduced light generated in an optical path substantially equal to the reference laser light is detected, and the intensity of the reproduced light By determining that the specific information that is the basis of the recorded data and the specific information that is the source of the information laser beam (specific information obtained from a specific individual) when the value becomes larger than a predetermined value, There is a system that performs authentication.

This authentication system is a very excellent system that can perform high-speed user authentication after recording a large amount of specific information. In addition, there is an advantage that the tolerance of the deviation of the laser irradiation position from the data recording position is large as compared with the case of reproducing the data recorded on the hologram recording medium by the normal shift multiplexing method.
Kashiko Ogura, “Development of all-optical ultra-high-speed image search engine and highly secure biometric authentication”, [online], October 1, 2006, CEATEC JAPAN, [March 1, 2007 search], Internet < URL: http://www.ceatec.com/2006/en/visitor/ex_detail.html?id=6516>

  However, in this authentication system, it is necessary to provide circuits and mechanisms for focus servo control and tracking servo control as in the case of reproducing data recorded on the hologram recording medium by the shift multiplexing method. There is a problem that it is difficult to reduce the cost.

  The present invention has been made in view of such circumstances, and possesses specific information by irradiating a hologram recording medium on which data based on specific information is recorded with information laser light based on specific information owned by the user. It is an object of the present invention to provide an authentication apparatus and an authentication method that can reduce the cost of the apparatus by eliminating the need for focus servo control and tracking servo control.

  The authentication apparatus according to claim 1, wherein the irradiation point of the laser beam on the hologram recording medium is moved in the radial direction of the hologram recording medium every time at least one rotation by the rotating means is performed; Second radial direction moving means for moving the irradiation point of the laser beam on the hologram recording medium at a set speed in the radial direction of the hologram recording medium, and a radius for detecting the radial position of the irradiation point of the laser beam on the hologram recording medium Position detecting means, reference laser light irradiating means for irradiating only the reference laser light in an optical path substantially equal to the optical path of the reference laser light when data is recorded on the hologram recording medium, and second radial movement means The hologram recording medium is irradiated with the reference laser beam by the reference laser beam irradiation means, A second reproducing light intensity detecting means for detecting the intensity of the reproducing light generated from the ram recording medium in an optical path substantially equal to the information laser light, and the intensity of the reproducing light detected by the second reproducing light intensity detecting means in the radial position. At the time of detection of the reproduction light intensity by the recording radius position acquisition means for acquiring the recording radius position of the data from the curve formed by associating with the radial position detected by the detection means, and the first reproduction light intensity detection means, The laser beam in the hologram recording medium is moved in the radial direction by the first radial direction moving means, and the radial position detected by the radial position detecting means coincides with the recording radial position of the data acquired by the recording radial position acquiring means. And a laser beam irradiation radial position control means for controlling the radial position of the irradiation point.

  In the authentication apparatus according to claim 2, the rotating means includes a motor, the motor is connected to the turntable, the hologram recording medium is fixed to the turntable, and the motor, the turntable, and the hologram recording medium are provided. It is characterized by being attached and detached integrally.

  The authentication apparatus according to claim 3 is characterized in that the optical path of the information laser beam and the optical path of the reference laser beam intersect at a recording location of the hologram recording medium.

  5. The authentication method according to claim 4, wherein the irradiation point of the laser beam on the hologram recording medium is moved in the radial direction of the hologram recording medium at a set speed while detecting the radial position of the irradiation point of the laser beam. By irradiating only the reference laser beam in the optical path substantially equal to the optical path of the reference laser beam when data is recorded on the hologram recording medium, the intensity of the reproduction light generated from the hologram recording medium in the optical path substantially equal to the information laser beam is detected. When the data recording radius position is obtained from a curve formed by associating the intensity of the detected reproduction light with the detected radial position and the hologram recording medium is irradiated with information laser light, the laser in the hologram recording medium When the light irradiation point is moved in the radial direction of the hologram recording medium every time the hologram recording medium is rotated at least once To, and controlling so as to match the recording radial position of the data radial position of the irradiation point of the laser light is acquired.

  According to the first and fourth aspects of the present invention, the irradiation point of the laser beam is moved concentrically, and the data recording radius position is determined by the intensity of the reproduction light when the reference laser beam is irradiated before the data reproduction. In the data reproduction, the irradiation radius position of the laser beam is matched with the recording radius position of the acquired data. Therefore, if the eccentricity or surface blur of the hologram recording medium is small, the irradiation position of the laser beam is determined as the hologram recording medium. Even if the accuracy of the feed motor for moving in the radial direction is almost the same as normal, the deviation of the irradiation position of the laser beam from the data recording position can be within an allowable range, eliminating the need for focus servo control and tracking servo control. The cost of the apparatus can be reduced.

  According to the invention of claim 2, since the motor, the turntable, and the hologram recording medium are integrally attached and detached, the eccentricity becomes very small, and the motor direction with respect to the irradiation position of the laser beam is made constant. Even if the accuracy of the feed motor for moving the laser beam irradiation position in the radial direction of the hologram recording medium is the same as normal, the fluctuation of the irradiation position of the laser beam in the focus direction seen from the hologram recording medium is constant. The deviation of the irradiation position of the laser beam from the recording position can be within an allowable range, and focus servo control and tracking servo control are not required, and the cost of the apparatus can be reduced.

  According to the third aspect of the present invention, since the optical path of the information laser beam and the optical path of the reference laser beam intersect at the recording location of the hologram recording medium, it is not necessary to increase the NA of the objective lens. And the tolerance of deviation of the irradiation position of the laser beam from the data recording position in the focus direction can be increased.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. An authentication apparatus according to an embodiment of the present invention reproduces data from a hologram recording medium by irradiating a hologram recording medium on which data based on specific information such as biometric information is recorded with an information laser beam based on the specific information owned by the user. It detects light and authenticates users who own specific information.

  FIG. 1 is a configuration diagram illustrating an example of an authentication apparatus according to the present invention. FIG. 2 is an explanatory diagram showing how data is recorded on the hologram recording medium in the authentication apparatus according to the present invention. FIG. 3 is an explanatory diagram showing changes in the reproduction light intensity when the irradiation position of the reference laser beam in the hologram recording medium is moved in the radial direction. 4 and 5 are flowcharts of a program executed by the controller when the user is authenticated in the authentication apparatus according to the present invention.

  In FIG. 1, the authentication device 1 includes a pickup device 200, a controller 400 including a display device 402 and an input device 404, a laser drive circuit 202, a recording signal generation circuit 204, an open / close control circuit 206, a reproduction light intensity detection circuit 208, It comprises a turntable 120, a spindle motor 122, a feed motor 124, a support member 126, a spindle motor control circuit 102, a feed motor control circuit 108, a rotational position detection circuit 104, a radial position detection circuit 106, a biological information acquisition device 300, and the like. Yes.

  The pickup device 200 includes a laser light source 10, a collimator lens 12, beam splitters 14 and 32, mirrors 16, 22 and 30, relay lenses 18 and 24, a spatial light modulator (SLM) 20, and a condenser lens 26. , A shutter 28, a photo-detector 34, and the like. The beam splitter 14 divides the recording laser light into two, one becomes information laser light by passing through the spatial light modulator 20, and the other becomes reference laser light. The spatial light modulator 20 is made of a transmissive TFT liquid crystal display (LCD) panel or the like, receives two-dimensional binarized data output from a recording signal generation circuit 204 described later, and displays light and dark on a plane. The dot pattern is formed. The spatial light modulator 20 may use a DMD (digital micromirror device) instead of the SLM. The mirrors 16, 22, and 30 change the traveling direction of the information laser beam or the reference laser beam. The relay lenses 18 and 24 change the diameter of the cross section of the laser light. The shutter 28 is opened and closed by an open / close control circuit 206 described later, and is opened when recording on the hologram recording medium 6 and closed when authentication is performed. The condensing lens 26 condenses the information laser light on the recording layer of the hologram recording medium 6. A photo detector 40 is provided at a position where the reference laser beam passes through the hologram recording medium 6.

  The beam splitter 32 transmits approximately half of the incident laser beam and reflects approximately half of the laser beam. Of the laser light incident from the spatial light modulator 20 side, approximately half of the transmitted laser light is irradiated onto the hologram recording medium 6, and substantially half of the reflected laser light is left as it is and is not used. In addition, substantially half of the reproduction light reflected from the hologram recording medium 6 incident from the mirror 22 side is received by the photodetector 34, and almost half of the reproduction light transmitted is left as it is and is not used.

  The hologram recording medium 6, the turntable 120, and the spindle motor 122 are integrated, and when attaching to and detaching from the apparatus, these are integrated with a support member 126 connected to the feed motor 124, and the spindle Wires from the spindle motor control circuit 102 and the rotational position detection circuit 104 are attached to the motor 122. It should be noted that the convex portion of the spindle motor 122 is fitted into the concave portion formed in the support member 126 so that the orientation of the spindle motor 122 when set on the support member 126 is constant. Thereby, even when the hologram recording medium 6 recorded concentrically by another authentication apparatus is set, there is almost no difference between the recording center and the rotation center of the hologram recording medium 6 (that is, there is almost no eccentricity). Even if the hologram recording medium 6 is deviated, the variation of the laser irradiation position viewed from the hologram recording medium 6 is constant.

  The spindle motor control circuit 102 calculates the rotation speed from the number of pulses per unit time of the pulse signal input from the encoder in the spindle motor 122 and adjusts the rotation speed to the rotation speed input from the controller 400. Control the rotation of The controller 400 calculates a rotation speed at which a predetermined linear velocity is obtained from a radius value input from a radius position detection circuit 106 described later, and outputs the rotation speed to the spindle motor control circuit 102.

  The rotational position detection circuit 104 receives an index signal and a pulse signal output from the encoder in the spindle motor 122, calculates a rotation angle from the number of pulses of the pulse signal after the index signal is input, and outputs the rotation angle. The radial position detection circuit 106 calculates the movement distance by counting the number of pulses of the pulse signal input from the encoder in the feed motor 124 after the feed motor 124 has moved to the initial position where the radius value is known at the operation start stage of the apparatus. Then, the radius value is calculated and output by adjusting to the radius value of the initial position. When the radial position is input from the controller 400, the feed motor control circuit 108 drives the feed motor 124 until the radial position input from the radial position detection circuit 106 reaches the radial position input from the controller 400. A signal indicating that the radius value input to the controller 400 has been reached is output. The feed motor control circuit 108 calculates the feed speed from the number of pulses per unit time of the pulse signal inputted from the encoder in the feed motor 124 when the radial feed command and the feed speed are inputted from the controller 400. Then, the rotation of the feed motor 124 is controlled so that the feed speed becomes the feed speed input from the controller 400.

  The laser drive circuit 202 supplies a voltage and a current for emitting laser light having a predetermined intensity from the laser light source 10 according to a command from the controller 400. The recording signal generation circuit 204 converts the original data (digital image data) related to the biometric information input from the controller 400 into two-dimensional binarized data by a predetermined conversion and stores it in a memory in the circuit. Every time there is a command from 400, it is supplied to the spatial light modulator 20. The recording signal generation circuit 204 stores data for setting all the spatial light modulators 20 to dark dots. When the controller 400 receives a laser light cutoff command, the recording signal generation circuit 204 outputs the data.

  When the reproduction light intensity detection circuit 208 receives a command from the controller 400, the reproduction light intensity detection circuit 208 inputs a signal having an intensity corresponding to the amount of reproduction light output from the photo detector 34 or the photo detector 40, and converts the intensity of the signal into digital data. Output at time intervals. Whether to select a signal from the photo detector 34 or a signal from the photo detector 40 is in accordance with a command from the controller 400. The open / close control circuit 206 opens / closes the shutter 28 in response to a command from the controller 400.

  The biometric information acquisition apparatus 300 acquires digital data of biometric information such as digital image data of a face as shown in FIG. 1 and supplies the data to the controller 400. In addition, the digital data of biometric information may be digital image data such as fingerprints and irises.

  In the authentication device 1 configured as described above, the worker first acquires digital image data of a plurality of individuals as targets using the biometric information acquisition device 300, and inputs the personal name from the input device 404 for each acquisition. As a result, a plurality of individual digital image data are associated with the individual names and stored in the memory in the controller 400. Next, the hologram recording medium 6 is set on the turntable 120 and the input device 404 is operated to instruct the start of recording. As a result, first, a plurality of individual digital image data stored in the memory in the controller 400 is supplied to the recording signal generation circuit 204, converted into two-dimensional binary data, and stored in the memory in the circuit. At this time, they are stored in the order stored in the memory in the controller 400.

  Next, the recording start radius position is input to the feed motor control circuit 108 from the controller 400, and the feed motor 124 is driven by the control of the feed motor control circuit 108 to move to the set radial position. Then, the rotation speed is input from the controller 400 to the spindle motor control circuit 102, and the spindle motor 122 is rotated under the control of the spindle motor control circuit 102, whereby the hologram recording medium 6 is rotated. When the rotation is started, the rotation position detection circuit 104 and the radial position detection circuit 106 output the rotation angle value and the digital data of the radius value to the controller 400.

  Next, the controller 400 instructs the open / close control circuit 206 to open the shutter 28, instructs the recording signal generation circuit 204 to output data, and instructs the laser drive circuit 202 to perform laser irradiation. Thereby, the information laser beam and the reference laser beam are irradiated onto the hologram recording medium 6 to perform recording. The irradiation time and the stop time between the irradiations are set in the controller 400, and when the predetermined irradiation time has elapsed, the controller 400 instructs the laser driving circuit 202 to stop the laser irradiation, and the recording signal generation circuit 204 is next processed. Is output, and when a predetermined stop time has elapsed, the laser drive circuit 202 is instructed to perform laser irradiation. By repeating this, data is shift-multiplex-recorded on the hologram recording medium 6.

  In the memory of the controller 400, the radius value for data recording is stored at r0 to rm so that the recording locations in the radial direction are equally spaced, and the controller 400 feeds the motor every time the spindle motor 122 rotates. A new radius value is output to the control circuit 108. Then, the controller 400 stops the irradiation of the laser light while the feed motor 124 is being driven. As a result, concentric data is recorded on the hologram recording medium 6 as shown in FIG. Specifically, the controller 400 captures and stores the digital data of the rotational position output by the rotational position detection circuit 104 at the start of laser irradiation, and immediately before the rotational position where the digital data of the rotational position that is continuously captured is stored. When the rotation position is reached, laser irradiation is stopped regardless of the predetermined time, and a new radius value is output to the feed motor control circuit 108. When the movement completion signal is input from the feed motor control circuit 108, the laser irradiation for a predetermined time and the data output instruction to the recording signal generation circuit 204 are resumed, and the rotational position digital data output by the rotational position detection circuit 104 is resumed. Is stored and stored. Repeat this.

  Since the irradiation time is short with respect to the linear velocity at the laser irradiation location, it may be considered that the recording is performed with the hologram recording medium 6 stopped. Then, the controller 400 takes in the rotation angle value input to the controller 400 when instructing the laser irradiation, and the number m of the rotation angle value and the radius value rm (the innermost data recording radius is 0, 0, 1 , 2, 3... Are generated and stored. Alternatively, the rotation angle value and the number m may be used as address data.

  Since the personal data is stored in the memory in the recording signal generation circuit 204 in the same order as the memory in the controller 400 and the data is output to the spatial light modulator 20 in the same order, the acquired address data is stored in the acquired order. As a result, the personal biometric information (digital image data) and the personal name stored in the memory in the controller 400 can be associated with the address data.

  Recording by irradiation of the information laser beam and the reference laser beam to the hologram recording medium 6 is performed until the correspondence between the biometric information (digital image data) and the personal name and address data stored in the controller 400 is completed (that is, This is done until all the data stored in the memory in the recording signal generation circuit 204 is output), and the process ends. When the recording is completed, the controller 400 stops the circuit and the device that are initially operated. If data based on a plurality of individual biometric information is recorded on the hologram recording medium 6 in this way, the user can be authenticated at any time.

  When authenticating a user using the authentication device 1 of the present embodiment, if the hologram recording medium 6 set in the authentication device 1 is recorded with data by another authentication device, as described above. The hologram recording medium 6, the turntable 120 and the spindle motor 122 which are integrated with each other are set on the support member 126, and wiring is attached to the spindle motor 122. Thereby, there is almost no difference between the center of data recording and the rotation center of the hologram recording medium 6 (that is, there is almost no eccentricity), and the laser irradiation position viewed from the hologram recording medium 6 even if the hologram recording medium 6 is shaken. Therefore, if the data recording radial position and the laser irradiation radial position can be matched, the laser irradiation position and the data recording position coincide with each other within an allowable range.

  When the user is recognized by the authentication device 1, the user performs input for authentication (input of the user's name, input of an authentication request, etc.) from the input device 404, and the front of the biometric information acquisition device 300. A face (or a part having biometric information such as a fingerprint or an iris) is displayed. The controller 400 starts the program of the flowchart shown in FIGS. 4 and 5 in response to an input from the input device 404. Hereinafter, it demonstrates according to a flowchart. The reference numerals in parentheses correspond to the reference numerals in the flowcharts of FIGS.

  First, n is set to an initial value (S102), and the biometric information acquisition apparatus 300 is operated to acquire digital image data of a user's face (or a portion having biometric information such as a fingerprint or an iris) and store it in a memory. Store (S104). Then, the feed motor control circuit 108 outputs the innermost radial position to drive the feed motor 124 so that the irradiation position when the laser beam is irradiated becomes the innermost radial position (S106). . Then, a command is issued to the reproduction light intensity detection circuit 208, and output is started so that the digital data of the signal intensity output from the reproduction light intensity detection circuit 208 becomes a signal from the photodetector 34 (PD34) (S108). A command is issued to the control circuit 206 to open the shutter 28 (S110), and a command to shut off the laser beam is issued to the recording signal generation circuit 204 so that all the pixels of the spatial light modulator 20 are in the dark state. In step S112, a command is issued to the laser driving circuit 202 to emit laser light from the laser light source (S114). At this time, since the spatial light modulator 20 blocks the laser beam while the shutter 28 is in the open state, the hologram recording medium 6 is irradiated only with the reference laser beam irradiated obliquely to the hologram recording medium 6. is there.

  In this state, a radial movement start command and a moving speed are output to the feed motor control circuit 108, and the irradiation position of the laser light is moved from the innermost radial position toward the outer periphery (S116), and the reproduction light intensity detection is performed. The digital data I (n) of the signal intensity corresponding to the reproduction light intensity output from the circuit 208 is captured (S118), and the digital data r (n) of the radius value output from the radial position detection circuit 106 is captured (S120). When the captured signal intensity I (n) is equal to or less than the set value A (S122-NO), it is determined that the radius value r (n) is smaller than the recording limit radius (the outermost peripheral radius of the hologram recording medium 6). In addition, the signal intensity I (n) and the radius value r (n) are captured again (S118, S120). If the acquired signal intensity I (n) is larger than the set value A (S122-YES), n is incremented (S124), and the signal intensity I (n) and the radius value r (n) are acquired again. (S118, S120). This is repeated, and when the radius value r (n) becomes larger than the recording limit radius (S126-YES), the process proceeds to the next step.

  At this time, the memory of the controller 400 stores data of signal strengths I (0) to I (n) and data of radius values r (0) to r (n). The irradiation position of the reference laser beam moves from the innermost circumference to the outermost circumference as indicated by an arrow in FIG. 2, and when the irradiation position of the reference laser light comes to the data recording location, the reproduction light is emitted from the hologram recording medium 6. Since it is generated in the same optical path as the information laser light and enters the photodetector 34, the relationship between the radial position and the reproduction light intensity is shown in a graph in FIG. Since n is incremented when the captured signal intensity I (n) (corresponding to the reproduction light intensity) is larger than the set value A, the signal intensity I (n) and the radius value r (n) remain stored. become. That is, the stored data of the signal intensities I (0) to I (n) and the data of the radius values r (0) to r (n) are the data indicated by dots in FIG.

  Using the stored data of the signal intensities I (0) to I (n) and the radius values r (0) to r (n), the radius values r0 to rm at the position where the signal intensity reaches a peak are calculated ( S128). This is a process for calculating the radial positions of r0, r1, r2, and r3 in FIG. For the calculation, a method can be used in which a relational curve of signal intensity = f (radius value) is obtained, and a differential value is obtained by differentiating to obtain a radius value where the differential value is zero. By this processing, the radius values r0 to rm of the data evening recording location can be obtained.

  Next, the rotation speed is outputted to the spindle motor control circuit 102 to start the rotation (S130), the command is sent to the reproduction light intensity detection circuit 208, and the signal intensity digital data output from the reproduction light intensity detection circuit 208 is the photo detector. 40 (PD40), the output is started (S132), a command is sent to the open / close control circuit 206 to close the shutter 28 (S134), and the user's face is shown to the recording signal generation circuit 204. Digital image data (or a portion having biometric information such as a fingerprint or an iris) is output and two-dimensional binary data is generated by the recording signal generation circuit 204 (S136), and the generated two-dimensional binary data Data is output to the spatial light modulator 20 (S138). At this time, since the dot pattern based on the two-dimensional binarized data is formed in the spatial light modulator 20 with the shutter 28 closed, the hologram light recording medium 6 is irradiated with the spatial light modulator 20. It is the information laser beam diffracted by.

  Digital image data that is the basis of the two-dimensional binarized data when creating the information laser beam (hereinafter referred to as image data that is the basis of the information laser beam), and an information laser at the time of data recording at the data recording location When the image data that is the basis of the light matches, reproduction light is generated on the same optical path as the reference laser light. This reproduction light is received by the photodetector 40.

  The processing after the step (S138) of outputting the created two-dimensional binarized data to the spatial light modulator 20 is to irradiate the information recording laser beam to the data recording location, and the radius of the location where the reproduction light larger than the predetermined value is generated. This is a process of detecting (i.e., authenticating) a value number and a rotation angle to determine whether an individual determined from the radius value number and the rotation angle matches a user input from the input device.

  Specifically, m and S are set to the initial value 0 (S140, S141), the radial position rm is output to the feed motor control circuit 108, and the irradiation position of the information laser beam is set to the radius value rm (S142). . Then, the rotation angle is taken in and stored as ΘI (S144), the reproduction light intensity I and the rotation angle Θ are taken in (S146, S148), and if the taken reproduction light intensity I is smaller than the predetermined value B (S150-NO). ), After the rotation angle Θ becomes smaller than the minute angle (S154-YES), until it becomes larger than Θ1 (S154-NO, S158-NO), the process returns to the reading of the reproduction light intensity I (S146) and the same processing is repeated. . When the rotation angle Θ becomes larger than ΘI (S158-Yes), m is incremented (S160). If m is not larger than the maximum m (if there is a radius position rm) (S162-NO), the next radius The position rm is moved (S142), and the same processing is performed (S144 and later).

  Thereby, after the irradiation position of the information laser light matches the data recording position, when the hologram recording medium 6 makes one rotation, the movement to the next data recording radius position is repeated. In this repetition, when the image data that is the basis of the irradiated information laser beam and the image data that is the basis of the information laser beam at the time of data recording at the data recording location match, the reproduction light intensity I is a predetermined value B It becomes larger (S150-YES). At this time, the personal information corresponding to the address data created from the rotation angle Θ and the number m of the radial position rm taken together with the reproduction light intensity I is called from the memory storage, and the user input from the input device 404 by the user It is determined whether the information matches (that is, authenticated) (S164).

  Thereafter, a stop command is output to the laser drive circuit 202 and the spindle motor control circuit 102, the laser beam irradiation is stopped (S168), the rotation is stopped (S170), and the program is ended (S172).

  Further, if the reproduction light intensity I does not become larger than the predetermined value B until the hologram recording medium 6 makes one rotation at the last data recording radius, it is determined that there is no rm corresponding to the incremented m (S160) (S162). -YES), the display device 402 displays that the user cannot be authenticated (there is no personal information corresponding to the user) (S166), and outputs a stop command to the laser drive circuit 202 and the spindle motor control circuit 102. Then, the laser beam irradiation is stopped (S168), the rotation is stopped (S170), and the program is terminated (S172).

  Before performing authentication by irradiating the information laser beam in this way, the reference laser beam is irradiated and the radial movement is performed, and the radial positions r0 to rm where the data is recorded are obtained, so that the radial movement is performed. Even if the accuracy of the feed motor 124 to be performed is as high as that of a normal hologram recording / reproducing apparatus, the radial position of data recording and the radial position of laser irradiation can be matched, so an integrated hologram recording medium 6. By setting the turntable 120 and the spindle motor 122 on the support member 126 and executing the above-described program, the data recording position and the information laser light irradiation position can be matched within an allowable range.

  As described above, according to the authentication device 1 of the present embodiment, the laser light irradiation point is moved concentrically, and data is obtained based on the intensity of the reproduction light when the reference laser light is irradiated before data reproduction. Since the recording radius position is acquired and the irradiation radius position of the laser beam is matched with the recording radius position of the acquired data in the data reproduction, the irradiation position of the laser beam is small if the eccentricity or surface blur of the hologram recording medium is small Even if the accuracy of the feed motor 124 for moving the recording medium in the radial direction of the hologram recording medium 6 is about the same as usual, the deviation of the irradiation position of the laser beam from the data recording position can be within an allowable range. Tracking servo control is not required, and the cost of the apparatus can be reduced.

  Further, since the spindle motor 122, the turntable 120, and the hologram recording medium 6 are integrally attached and detached, the eccentricity becomes very small, and if the orientation of the spindle motor 122 with respect to the irradiation position of the laser beam is made constant, the hologram The fluctuation of the irradiation position of the laser beam in the focus direction as viewed from the recording medium 6 becomes constant, and the accuracy of the feed motor 124 for moving the irradiation position of the laser light in the radial direction of the hologram recording medium 6 is about the same as usual. The deviation of the irradiation position of the laser beam from the data recording position can be allowed, and the cost of the apparatus can be reduced by eliminating the need for focus servo control and tracking servo control.

  Furthermore, since the optical path of the information laser beam and the optical path of the reference laser beam intersect at the recording location of the hologram recording medium 6, it is not necessary to increase the NA of the objective lens, so that the depth of focus is widened and the focus direction is increased. The tolerance of the deviation of the irradiation position of the laser beam from the data recording position can be increased.

  The above embodiment can be variously modified. In the above description, the reference laser beam is irradiated obliquely. However, the dot pattern of the spatial light modulator 20 is different from the hologram recording / reproducing apparatus in the ordinary shift multiplex system like the authentication apparatus 2 shown in FIG. Only the bright pixels on the outside may be used so that the reference laser beam is outside the information laser beam. According to this, since it is necessary to increase the NA of the objective lens, the depth of focus is reduced, and the tolerance of the deviation of the laser irradiation position from the data recording position in the focus direction is reduced, but the integrated hologram recording If the medium 6, the turntable 120, and the spindle motor 122 can be set on the support member 126 with high accuracy, the same effects as in the above embodiment can be obtained.

  In the above embodiment, the hologram recording medium 6, the turntable 120, and the spindle motor 122 are integrally attached to and detached from the authentication device 1. However, the method of setting the hologram recording medium 6 is devised to be the center of data recording. If the difference from the rotation center of the hologram recording medium 6 is almost eliminated and the hologram recording medium 6 is hardly shaken, the hologram recording medium 6 is set on the turntable 120 like a normal hologram recording / reproducing apparatus. It may be a configuration. Also by this, the same effect as the above embodiment can be obtained.

  Further, in the above embodiment, the authentication device 1 is configured to be able to perform data recording on the hologram recording medium and data reproduction (user authentication), but the authentication device is a hologram recorded by another authentication device. The recording medium 6 may be set so that only data reproduction (user authentication) can be performed. Also by this, the same effect as the above embodiment can be obtained.

  Furthermore, in the above embodiment, the hologram recording medium 6, the turntable 120 and the spindle motor 122 are moved by the feed motor 124 to move the laser irradiation position in the radial direction. However, the pickup device 200 is moved in the radial direction by the feed motor 124. Various modifications may be made without departing from the object of the present invention.

  As described above, according to the present invention, the hologram recording medium on which data based on specific information is recorded is irradiated with an information laser beam based on the specific information owned by the user to authenticate the user who owns the specific information. It is possible to provide an authentication apparatus and an authentication method that can reduce the cost of the apparatus by eliminating the need for focus servo control and tracking servo control.

It is a block diagram which shows an example of the authentication apparatus which concerns on this invention. It is explanatory drawing which showed how the data recording to the hologram recording medium in the authentication apparatus by this invention was carried out. It is explanatory drawing which showed the change of the reproduction light intensity when the irradiation position of the reference laser beam in a hologram recording medium is moved to a radial direction. It is a flowchart of the program which a controller performs when a user receives authentication in the authentication apparatus by this invention. It is a flowchart of the program which a controller performs when a user receives authentication in the authentication apparatus by this invention. It is a block diagram which shows the other example of the authentication apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Authentication apparatus 2 ... Authentication apparatus 6 ... Hologram recording medium 10 ... Laser light source 12 ... Collimating lens 14 ... Beam splitter 16 ... -Mirror 18 ... Relay lens 20 ... Spatial light modulator 22 ... Mirror 24 ... Relay lens 26 ... Condensing lens 28 ... Shutter 30 ... Mirror 32 ... Beam splitter 34 ... Photo detector 40 ... Photo detector 102 ... Spindle motor control circuit 104 ... Rotation position detection circuit 106 ... Radial position detection circuit 108 ... Feed motor Control circuit 120 ... Turn table 122 ... Spindle motor 124 ... Feed motor 126 ... Support member 200 ... Pickup device 202 ... User drive circuit 204 ... Recording signal generation circuit 206 ... Opening / closing control circuit 208 ... Reproducing light intensity detection circuit 220 ... Pickup device 300 ... Biological information acquisition device 400 ... Controller 402- ..Display device 404 ... Input device

Claims (4)

A turntable on which a hologram recording medium is mounted, a rotating means for rotating the turntable, data that is specific information is converted into two-dimensional binary data, and information is obtained based on the converted two-dimensional binary data. Information laser light creating means for creating laser light, and rotating the hologram recording medium on which data based on data as specific information mounted on the turntable is rotated by the rotating means and the information laser light creating means First reproduction for detecting the intensity of the reproduction light generated in the optical path substantially equal to the optical path of the reference laser light when data is recorded from the hologram recording medium onto the hologram recording medium. Information applied to the hologram recording medium by the intensity of the reproduction light detected by the light intensity detection means and the first reproduction light intensity detection means In the authentication device that includes a specific information and determining authentication means whether the match with the specific information to be original data recorded in the holographic recording medium according to the original laser light,
First radial movement means for moving the irradiation point of the laser beam on the hologram recording medium in the radial direction of the hologram recording medium every time the rotation by the rotation means is performed at least once;
Second radial direction moving means for moving the irradiation point of the laser beam on the hologram recording medium in the radial direction of the hologram recording medium at a set speed;
A radial position detecting means for detecting a radial position of an irradiation point of the laser beam in the hologram recording medium;
A reference laser beam irradiation means for irradiating only the reference laser beam in an optical path substantially equal to the optical path of the reference laser beam when data is recorded on the hologram recording medium on the hologram recording medium;
Radial movement is performed by the second radial movement means, and the reference laser light is irradiated to the hologram recording medium by the reference laser light irradiation means, and is generated from the hologram recording medium in an optical path substantially equal to the information laser light. Second reproducing light intensity detecting means for detecting the intensity of reproducing light to be reproduced;
Recording radius position for acquiring a recording radius position of data from a curve formed by associating the intensity of the reproducing light detected by the second reproducing light intensity detecting means with the radial position detected by the radial position detecting means Acquisition means;
When the reproduction light intensity is detected by the first reproduction light intensity detection means, the radial movement is performed by the first radial movement means, and the recording radius position of the data acquired by the recording radius position acquisition means is set. An authentication apparatus comprising: a laser beam irradiation radial position control unit that controls a radial position of a laser beam irradiation point on the hologram recording medium so that the radial positions detected by the radial position detection unit coincide with each other.   The rotating means includes a motor, the motor is connected to the turntable, the hologram recording medium is fixed to the turntable, and the motor, the turntable, and the hologram recording medium are integrated. The authentication apparatus according to claim 1, wherein the authentication apparatus is attached and detached.   3. The authentication apparatus according to claim 1, wherein an optical path of the information laser beam and an optical path of the reference laser beam intersect at a recording location of the hologram recording medium. Data that is specific information is converted into two-dimensional binarized data, information laser light is created based on the converted two-dimensional binarized data, and data based on the data that is the specific information is recorded Rotate the hologram recording medium and irradiate the information laser light, and detect the intensity of the reproduction light generated with the light approximately equal to the optical path of the reference laser light when data is recorded from the hologram recording medium to the hologram recording medium. Whether or not the specific information that is the source of the information laser beam irradiated to the hologram recording medium and the specific information that is the source of the data recorded on the hologram recording medium is determined based on the detected intensity of the reproduction light. In the authentication method for judging,
Moving the irradiation point of the laser beam on the hologram recording medium in the radial direction of the hologram recording medium at a set speed while detecting the radial position of the irradiation point of the laser beam;
The hologram recording medium is irradiated with only the reference laser light in an optical path substantially equal to the optical path of the reference laser light when data is recorded on the hologram recording medium, and is generated from the hologram recording medium in an optical path substantially equal to the information laser light. Detect the intensity of the reproduction light,
Obtain the recording radius position of the data from the curve formed by associating the intensity of the detected reproduction light with the detected radial position,
When irradiating the hologram recording medium with the information laser beam, the irradiation point of the laser beam on the hologram recording medium is moved in the radial direction of the hologram recording medium every time the hologram recording medium is rotated at least once. And an authentication method, wherein the control is performed so that the radial position of the irradiation point of the laser beam coincides with the recording radial position of the acquired data.

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