JP2010066956A - Optical information reading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information reading device in which a mechanism for detecting opening of a case is hard to be grasped. <P>SOLUTION: A light source 22 for detecting opening which is different from a reading light source 21 for radiating light to an information code B is provided inside the case 11, while the light source 22 for detecting opening radiates radiation light Ld for detection relating to a light-receiving surface S of a light-receiving sensor 28. A first lib 12a projecting so as to pass through between a part of an area So outside of photographic area of the light receiving sensor 28 and the light source 22 for detecting opening is provided in a front side case 12. A second lib 13a, projecting so as to pass through between the other part of the area So outside of photographic area of the light-receiving sensor 28 and the light source 22 for detecting opening, is provided in a back side case 13. A control circuit 40 detects opening of the case 11 based on comparison between a signal pattern P of a received optical signal output from the light-receiving sensor 28, in response to the radiation light Ld for detection from the light source 22 for detecting opening and a pattern Pd for detecting opening. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical information reading apparatus having a function capable of detecting unauthorized opening of a casing.

  Conventionally, as a technique related to an optical information reading device having a function capable of detecting unauthorized opening of a casing, a terminal device shown in Patent Document 1 below is known. In this terminal device, a housing is constituted by a housing upper case and a housing lower case to which the control board is fixed. A switch is provided on the case lower case side of the control board, and a plastic sheet provided with a predetermined wiring pattern is attached to the bottom wall of the case lower case. When the upper case and the lower case are assembled, the terminal of the switch on the control board and the wiring on the bottom wall of the lower case are connected to form a closed circuit.

  When the upper case and the lower case are separated for unauthorized opening, the switch circuit is disconnected from the wiring and the closed circuit is disconnected. By detecting this, unauthorized opening is detected.

Further, in the optical reading device disclosed in Patent Document 2 below, illumination is performed based on the luminance of reflected light (hereinafter also referred to as indirect reflected light) that is irradiated from a red light emitting diode for illumination and reflected in the peripheral region of the reading port. The degree of deterioration of the red light emitting diode is measured. This optical reader does not have a mechanism that can detect the unauthorized opening of the housing, but the luminance of the indirect reflected light when the housing is not opened and the indirect reflected light when the housing is opened is not. It is conceivable to detect unauthorized opening of the casing by using the difference.
JP 2001-242951 A JP-A-10-334178

  However, in the configuration described in Patent Document 1, once the casing is opened, an opening detection mechanism for detecting unauthorized opening of the casing is grasped by examining the inside of the casing in detail. End up. For this reason, when the casing of the apparatus having the opening detection mechanism is tampered with next, there is a problem that measures are taken not to operate the opening detection mechanism.

  Further, in the case of the unauthorized opening detection function of the casing using the configuration described in Patent Document 2, the opening detection mechanism cannot be grasped only by opening the casing, but the indirect reflected light described above is reflected by the inner surface of the casing. Since it is indirect light, its luminance is weak and it is easily affected by disturbance light entering from the reading port, so that the possibility of erroneous detection of unauthorized opening increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical information reading apparatus in which a mechanism for detecting opening of a housing is difficult to grasp.

  In order to achieve the above object, in the optical information reading device according to claim 1, the first light emitting means (21) for irradiating the information code (B) with light, A light receiving means (28) for receiving the reflected light (Lr) irradiated by the first light emitting means and reflected by the information code in the light receiving region (S) and outputting a light receiving signal corresponding to the reflected light; A reading means (40) for reading the information code based on the light reception signal from the light receiving means, a storage means (35) for storing information acquired by the reading process, a first case (12) and a first case An optical information reader (10) comprising a housing (11) configured by assembling two cases (13), and housing at least the storage means and the light receiving means, Placed in the enclosure The second light emitting means (22) for irradiating detection light (Ld) to the light receiving area, and the imaging outside area (Si) different from the imaging area (Si) where the reflected light reaches in the light receiving area. So) a first protrusion (12a) that protrudes from the first case so as to pass between a part of the second light-emitting means and the second light emission. A second projecting portion (13a) projecting from the second case so as to pass between the means and the reading means in response to the detection irradiation light from the second light emitting means. Further, the present invention is characterized in that opening of the housing is detected based on a comparison between a pattern (P) of the light reception signal output from the light receiving means and a predetermined signal pattern (Pd).

  According to the first aspect of the present invention, the second light-emitting means different from the first light-emitting means for irradiating the information code with light is provided in the casing formed by assembling the first case and the second case. The second light emitting unit is provided to irradiate the light receiving region of the light receiving unit with the detection irradiation light. Further, the first case is provided with a first projecting portion that projects so as to pass between a part of the non-imaging area of the light receiving unit and the second light emitting unit. In addition, the second case is provided with a second projecting portion that projects so as to pass between the other part of the non-imaging area of the light receiving unit and the second light emitting unit. Then, the reading unit detects opening of the housing based on a comparison between a pattern of the light reception signal output from the light receiving unit and a predetermined signal pattern in response to the detection irradiation light from the second light emitting unit.

  When the housing is not opened, the first projecting portion and the second projecting portion are arranged at different predetermined positions between the second light emitting means and the non-imaging area of the light receiving means. Yes. For this reason, the pattern of the light reception signal output from the light receiving means in response to the detection irradiation light from the second light emitting means is a predetermined signal influenced by the presence of both the first protrusion and the second protrusion. It becomes a pattern.

  On the other hand, for example, when the housing is opened by separating the first case and the second case and removing the first case, the first projecting portion is located between the second light emitting means and the imaging outside region of the light receiving means. It will be in the state where it is not arranged. At this time, the pattern of the light reception signal output from the light receiving means in response to the irradiation light for detection from the second light emitting means is a signal that is mainly influenced by the presence of the second protrusion and is not influenced by the first protrusion. Since it becomes a pattern, it differs from the predetermined signal pattern.

  Therefore, the reading unit detects the opening of the casing by comparing the pattern of the light receiving signal output from the light receiving unit with the predetermined signal pattern in response to the irradiation light for detection from the second light emitting unit. be able to. In this way, the mechanism for detecting opening is composed of a light receiving means normally used as an optical information reading device, a second light emitting means, and both protrusions. Therefore, even if the inside of the opened casing is examined, it is difficult to grasp that the second light emitting means and both protruding portions are part of the mechanism for detecting the opening.

Therefore, it is possible to make it difficult to grasp the mechanism for detecting the opening of the housing.
In addition, since the first protrusion and the second protrusion are disposed between the second light emitting unit and the imaging outside region of the light receiving unit, both the protrusions may block the reflected light from the information code. Absent.

  According to a second aspect of the present invention, the predetermined signal pattern is determined based on a comparison between a light reception signal pattern output from the light receiving means and a predetermined signal pattern in response to the detection irradiation light from the second light emitting means. When opening of the body is not detected, it is updated to be equal to the pattern of the received light signal at the time of this comparison.

  When the detection light is gradually changed due to aging of the second light emitting means, the light receiving signal output from the light receiving means in response to the detection light even when the housing is not opened. This pattern is different from the predetermined signal pattern, resulting in erroneous detection of opening. Therefore, by updating the predetermined signal pattern so that it is equal to the pattern of the light reception signal at the time of comparison when the opening of the housing is not detected, the opening of the opening due to the change in the detection irradiation light due to aging etc. False detection can be prevented.

  According to a third aspect of the present invention, the reading means performs a comparison for detecting the opening of the housing at the start or interruption of the power supply to the reading means. In order to detect the opening of the housing, it is necessary to irradiate the irradiation light for detection from the second light emitting means. For example, when the irradiation light for detection is irradiated every time a predetermined time elapses, Therefore, the power consumption becomes large. Therefore, the power consumption for detection of opening is reduced by comparing the two patterns by irradiating the detection irradiation light when the power supply to the reading means, which is the optimal timing for detection of opening, is started or cut off. Can be suppressed.

  In the invention of claim 4, the second light emitting means is disposed on the light receiving means side of the substrate on which the first light emitting means is disposed. Thus, since both the light emitting means of the second light emitting means and the first light emitting means are arranged on one substrate, the manufacturing cost can be reduced as compared with the case where each light emitting means is provided on a separate substrate. Can do. Further, since the second light emitting means and the first light emitting means having the same light emitting function are arranged on one substrate, it is more grasped that the second light emitting means is a part of a mechanism for detecting opening. Can be made difficult.

  Hereinafter, an optical information reading apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an optical information reading apparatus 10 according to the present embodiment. FIG. 2 is a sectional view showing a section 2-2 in FIG. FIG. 3 is a block diagram illustrating an electrical configuration of the optical information reading apparatus 10 of FIG.

  An optical information reader 10 shown in FIG. 1 is used as, for example, a portable code reader that reads an information code B such as a barcode, and includes a housing 11 configured by assembling a front case 12 and a back case 13. A circuit unit 20 and the like for constituting a code reader are accommodated therein.

  As can be seen from FIGS. 1 and 2, the back side case 12 is formed on the inner surface of the front side case 12 so as to pass between a part of the imaging outside region So (described later) of the light receiving sensor 28 and the unsealing detection light source 22. A flat plate-like first rib 12 a that protrudes toward 13 is provided. The front end portion of the first rib 12a is formed so as to be inserted into the insertion hole of the annular protrusion 13b of the back side case 13 when the front side case 12 and the back side case 13 are assembled.

  Further, on the inner surface of the back side case 13, a flat plate shape that protrudes toward the front side case 12 so as to pass between the other part (described later) of the non-imaging area So of the light receiving sensor 28 and the opening detection light source 22. The second rib 13a is provided. The front end of the second rib 13a is formed so as to be inserted into the insertion hole of the annular protrusion 12b of the front case 12 when the front case 12 and the back case 13 are assembled.

  On one end side (left side in FIG. 1) of the housing 11, a reading port 14 is provided that enables emission of illumination light Lf, which will be described later, and incidence of reflected light Lr. Further, a trigger switch 42 that is pressed when the information code B is irradiated with the illumination light Lf is provided on a substantially central side surface of the housing 11. In addition, a plurality of keys 15 for inputting information on the information code B and the like are provided on the front case 12 on the other end side (the right side in FIG. 1) of the housing 11, and the optical key is provided at the corner. A protector 16 is attached that can alleviate the impact received when the target information reader 10 drops.

  As shown in FIG. 3, the circuit unit 20 mainly includes an optical system such as a reading light source 21, an opening detection light source 22, an imaging lens 27, a light receiving sensor 28, a memory 35, a control circuit 40, and a trigger switch 42. And a microcomputer (hereinafter referred to as “microcomputer”) system.

  The optical system is divided into a light projecting optical system and a light receiving optical system. The reading light source 21 constituting the light projecting optical system functions as an illumination light source capable of emitting the illumination light Lf, and includes, for example, a plurality of red LEDs and lenses provided on the emission side of each LED. Yes. As shown in FIG. 1, the reading light source 21 is mounted on a light source substrate 23. FIG. 3 conceptually shows an example in which the illumination light Lf is irradiated toward the reading object R on which, for example, a barcode is printed as the information code B.

  As shown in FIG. 1, the unsealing detection light source 22 is mounted on the other side surface 23 b of the light source substrate 23 on which the reading light source 21 is mounted on one side surface 23 a, toward the light receiving surface S of the light receiving sensor 28. The illumination light source is configured to emit the direct detection irradiation light Ld.

  The light receiving optical system includes an imaging lens 27, a light receiving sensor 28, a reflecting mirror (not shown), and the like. The imaging lens 27 functions as an imaging optical system that collects incident light incident from the outside via the reading port 14 and forms an image on the light receiving surface S of the light receiving sensor 28. In this embodiment, after the illumination light Lf emitted from the reading light source 21 is reflected by the information code B, the reflected light Lr is condensed by the imaging lens 27 and the imaging region of the light receiving surface S of the light receiving sensor 28 is collected. A code image is formed on Si (described later).

  As shown in FIG. 2, the light receiving sensor 28 is configured by arranging a plurality of light receiving elements such as a CCD sensor, for example. The light receiving sensor 28 can receive the reflected light Lr incident through the imaging lens 27 and the detection irradiation light Ld directly irradiated from the unsealing detection light source 22 on the light receiving surface S. A light reception signal corresponding to the detection irradiation light Ld can be output.

  The light receiving surface S of the light receiving sensor 28 includes an imaging region Si (inside the wavy line shown in FIG. 2), which is a region where the reflected light Lr collected by the imaging lens 27 reaches and forms a code image, and this imaging It is divided into a non-imaging area So (inside the one-dot chain line shown in FIG. 2) that is an area other than the area Si.

  The microcomputer system includes an amplification circuit 31, an A / D conversion circuit 33, a memory 35, an address generation circuit 36, a synchronization signal generation circuit 38, a control circuit 40, a trigger switch 42, a buzzer 44, a display LED 45, a liquid crystal display 46, a communication interface. It consists of 48 grades.

  The light receiving signal (analog signal) output from the light receiving sensor 28 of the optical system is amplified by a predetermined gain by being input to the amplifier circuit 31, and then input from the analog signal when input to the A / D conversion circuit 33. Converted into a digital signal. Then, when the digitized signal, that is, image data (image information) is input to the memory 35, it is accumulated in a predetermined code image information storage area. The synchronization signal generation circuit 38 is configured to generate a synchronization signal for the light receiving sensor 28 and the address generation circuit 36, and the address generation circuit 36 is based on the synchronization signal supplied from the synchronization signal generation circuit 38. Thus, the storage address of the image data stored in the memory 35 can be generated.

  The memory 35 is a semiconductor memory device that can read information when power is supplied. The memory 35 is obtained by a predetermined program that can execute a reading process, an unauthorized opening detection process, and the like, which will be described later, and a reading process. Data relating to the information code B, the image data, and an opening detection pattern Pd described later are stored.

  The control circuit 40 is configured by a microcomputer capable of controlling the entire optical information reading apparatus 10, has a CPU, a system bus, an input / output interface, and the like, and has an information processing function. Is configured. In the present embodiment, a trigger switch 42, a buzzer 44, a display LED 45, a liquid crystal display 46, a communication interface 48, and the like are connected to the control circuit 40. For example, monitoring and management of the trigger switch 42, beep sounds, and alarms The control circuit 40 performs on / off of the sound of the buzzer 44 capable of generating sound, lighting / non-lighting of the display LED 45, display control of the liquid crystal display 46, control of the communication interface 48, and the like.

The reading process of the optical information reading apparatus 10 configured as described above is performed as follows.
For example, when a power switch (not shown) is turned on and a predetermined self-diagnosis process or the like is normally completed and the information code B can be read, an input of the trigger switch 42 that instructs to emit the illumination light Lf is accepted. . In this state, when the operator presses the trigger switch 42 to turn it on, the control circuit 40 outputs a light emission signal to the reading light source 21 with the synchronization signal as a reference. Upon receiving the light emission signal, the reading light source 21 emits the LED to emit the illumination light Lf. The illumination light Lf is applied to the information code B through the reading port 14.

  Then, the illumination light Lf irradiated to the information code B is reflected, and the reflected light Lr enters the housing 11 through the reading port 14. When the reflected light Lr reaches the light receiving surface S of the light receiving sensor 28 via the imaging lens 27, an image of the information code B, that is, a code image is formed on the imaging region Si of the light receiving surface S. It becomes. Thereby, each light receiving element constituting the light receiving sensor 28 is exposed, a light receiving signal corresponding to the image of the information code B is output from each light receiving element, and stored in the memory 35 as image data. Then, after binarizing the code image stored in the memory 35, a known decoding process is performed, and character data encoded as the information code B is decoded. When decoding is successful, a notification output indicating that (for example, “OK” characters, a short beep or green light), and when decoding fails, a notification output indicating that (for example, The letters “NG”, long beeps and red light) are output by the liquid crystal display 46, the buzzer 44, and the LED 45 to notify the user of the optical information reader 10 whether or not the information code B can be read. If the decoding is successful, the decoded data, that is, the content of the information code B is output to the liquid crystal display 46 or to the host computer (not shown) or the like via the communication interface 48.

Next, a tampering detection process for detecting the opening when the casing 11 is tampered with, which is a characteristic part of the present invention, will be described in detail with reference to FIGS.
FIG. 4 is a flowchart illustrating the flow of the unauthorized opening detection process. FIG. 5 is a flowchart illustrating a subroutine of the opening detection pattern setting process of FIG. FIG. 6 is an explanatory diagram illustrating the opening detection pattern Pd. FIG. 7 is an explanatory diagram illustrating a signal pattern P of a light reception signal in a state where the housing 11 is opened.

  First, in step S101 in FIG. 4, whether the power is turned on or off, that is, power supply for executing the reading process is started to the control circuit 40, or the power supply is cut off. It is determined whether it is done. Here, when the power on operation or the off operation is not performed, the determination of No is repeated in step S101. In particular, in the power on state that is the state after the power on operation, the above reading process is executed. Yes.

  Here, the reason for determining whether or not the power is turned on or off will be described. In order to detect the opening of the housing 11, it is necessary to irradiate the detection irradiation light Ld from the opening detection light source 22 as will be described later. For example, the detection irradiation light Ld is emitted every time a predetermined time elapses. In this case, the power consumption for opening detection is increased. Therefore, by irradiating the detection irradiation light Ld when the power is turned on or off, which is the optimal timing for detecting the opening, the power consumption for detecting the opening can be kept low.

  If the power is turned on or off during the repeated determination of No in step S101 (Yes in S101), whether or not the unsealing detection pattern Pd is stored in the memory 35 is determined in step S103. Is done. The opening detection pattern Pd is a signal pattern for determining whether or not the housing 11 is opened.

  Here, for example, when the optical information reading apparatus 10 is in the product shipment stage and the opening detection pattern Pd is not stored in the memory 35 (No in S103), the opening detection pattern setting process subroutine in step S200 is performed. Is executed.

  In the opening detection pattern setting processing subroutine, as shown in FIG. 5, first, in step S201, it is determined whether or not a special code has been read. This special code is a special code for storing the opening detection pattern Pd in the memory 35 at the time of product shipment, for example. When this special code is read according to the operation of the operator, in step S201 It is determined as Yes.

  Next, in step S203, an irradiation process of the unsealing detection light source 22 is performed. In this process, the detection irradiation light Ld is emitted from the unsealing detection light source 22 toward the light receiving surface S of the light receiving sensor 28 in accordance with an instruction from the control circuit 40.

  In step S205, signal pattern acquisition processing is performed. In this process, the signal pattern P of the light reception signal output from the light reception sensor 28 according to the detection irradiation light Ld is acquired.

  At this stage, since the product is in the shipping stage as described above, the casing 11 is not opened, and the gap between the opening detection light source 22 and the non-imaging area So of the light receiving surface S of the light receiving sensor 28 is the first. In this state, the first rib 12a and the second rib 13a are arranged at different positions. For this reason, as shown in FIG. 6, the presence of both the first rib 12a and the second rib 13a affects the signal pattern P of the light receiving signal output from the light receiving sensor 28 in accordance with the detection irradiation light Ld ( (Refer to the alternate long and short dash line ellipse shown in FIG. 6).

  Then, the signal pattern P acquired as described above is set as the opening detection pattern Pd by the opening detection pattern setting processing in step S207 and stored in the memory 35.

  As described above, if the housing 11 is not opened, the signal pattern P of the light reception signal output from the light reception sensor 28 in accordance with the detection irradiation light Ld is substantially equal to the signal pattern shown in FIG. Therefore, a signal pattern in a state where the casing 11 is not opened is set as an opening detection pattern Pd, and is output from the light receiving sensor 28 according to the opening detection pattern Pd and the detection irradiation light Ld at the time of opening determination. By comparing with the signal pattern P of the received light signal, it is possible to detect the opening of the housing 11 when the two signal patterns are different.

  When the unsealing detection pattern Pd is stored in the memory 35 as described above, the unsealing detection light source 22 is turned off in step S209, and the unsealing detection pattern setting processing subroutine ends.

  As described above, when the unsealing detection pattern Pd is set in the unsealing detection pattern setting processing subroutine, the determination processing in step S101 in FIG. 4 is performed again. When the power is turned on or off (Yes in S101), the unsealing detection pattern Pd is stored in the memory 35, so that the determination in Step S103 is Yes.

  Next, in step S105, similarly to step S203, the opening detection light source 22 is irradiated, and from the opening detection light source 22 to the light receiving surface S of the light receiving sensor 28 in accordance with an instruction from the control circuit 40. Irradiating light Ld for detection is emitted. Thereby, in step S107, a signal pattern acquisition process is performed in the same manner as in step S205, and a signal pattern P of a light reception signal output from the light reception sensor 28 according to the detection irradiation light Ld is acquired.

  When the signal pattern P is stored in the memory 35 by the signal pattern storage process in step S109, the unsealing detection light source 22 is turned off in step S111.

  Next, in step S113, it is determined whether or not the signal pattern P stored in step S109 is different from the opening detection pattern Pd. Here, if the housing 11 is not opened, the signal pattern P is a signal pattern influenced by the presence of both the first rib 12a and the second rib 13a, and the opening detection pattern Pd. Since it becomes substantially equal, it is determined No in step S113.

  In step S115, an opening detection pattern update process is performed. In this process, the opening detection pattern Pd is updated to be equal to the signal pattern P stored in step S109, and the processes from step S101 are repeated.

  Here, the reason why the opening detection pattern Pd is updated to be equal to the signal pattern P will be described. If the detection irradiation light Ld gradually changes due to the secular change of the opening detection light source 22 or the like, even if the casing 11 is not opened, an output from the light receiving sensor 28 according to the detection irradiation light Ld. The signal pattern P of the received light signal is different from the unsealing detection pattern Pd, and erroneous detection of unsealing occurs. Therefore, when the opening detection pattern Pd is updated so as to be equal to the signal pattern P of the received light signal at the time of comparison when the opening of the housing 11 is not detected, detection due to aging degradation or the like of the opening detection light source 22 The erroneous detection due to the change of the irradiation light Ld for use is eliminated.

  On the other hand, for example, in a state where the housing 11 is opened and the front case 12 is removed, the signal pattern P stored in step S109 is mainly due to the presence of the second rib 13a as shown in FIG. The signal pattern is influenced (refer to the alternate long and short dash line ellipse shown in FIG. 7) and is not affected by the first rib 12a. For this reason, the signal pattern P stored in step S109 and the opening detection pattern Pd are different (Yes in S113), and the opening of the housing 11 is detected in step S117.

  When the opening of the housing 11 is detected as described above, for example, when there is no operation of the predetermined key 15 indicating that the opening is normal, it is stored in the memory 35 as an unauthorized opening. The data related to the information code B is erased. Thereby, unauthorized use of information stored in the memory 35 can be prevented.

  As described above, in the optical information reading apparatus 10 according to this embodiment, the information code B is irradiated with light in the housing 11 configured by assembling the front case 12 and the back case 13. An opening detection light source 22 different from the reading light source 21 is provided, and the opening detection light source 22 irradiates the light receiving surface S of the light receiving sensor 28 with the detection irradiation light Ld. Further, the front case 12 is provided with a first rib 12 a that protrudes so as to pass between a part of the imaging outside region So of the light receiving sensor 28 and the unsealing detection light source 22. Further, the rear case 13 is provided with a second rib 13 a that protrudes so as to pass between the other part of the imaging outside area So of the light receiving sensor 28 and the unsealing detection light source 22. And the control circuit 40 is based on the comparison with the signal pattern P of the light reception signal output from the light reception sensor 28 according to the detection irradiation light Ld from the opening detection light source 22, and the opening detection pattern Pd. Detect opening of.

  As described above, the mechanism for detecting opening includes the light receiving sensor 28 that is normally used as the optical information reading apparatus 10, the light source 22 for opening detection, and both the ribs 12a and 13a. Therefore, even if the inside of the opened casing 11 is investigated, it is difficult to grasp that the opening detection light source 22 and both ribs 12a and 13a are part of the mechanism for detection of opening.

  In particular, the first rib 12a is formed so as to be inserted into the annular protrusion 13b of the back side case 13 at the tip thereof, and the second rib 13a is inserted into the annular protrusion 12b of the front side case 12 at the tip thereof. It is formed so that. For this reason, both ribs 12a and 13a are easily recognized as reinforcing members, and it is more difficult to grasp that both ribs 12a and 13a are part of a mechanism for detecting opening.

Therefore, it is possible to make it difficult to grasp the mechanism for detecting the opening of the housing 11.
Since both ribs 12a and 13a are disposed between the unsealing detection light source 22 and the non-imaging area So of the light receiving surface S of the light receiving sensor 28, both ribs 12a and 13a are reflected light Lr from the information code B. There is no blocking.

  In the optical information reading apparatus 10 according to the present embodiment, the unsealing detection pattern Pd is a signal pattern P of a light receiving signal output from the light receiving sensor 28 according to the detection irradiation light Ld from the unsealing detection light source 22. When the opening of the housing 11 is not detected based on the comparison between the opening detection pattern Pd and the opening detection pattern Pd, the pattern is updated to be equal to the signal pattern P at the time of this comparison. As a result, it is possible to prevent erroneous detection of opening due to a change in the detection irradiation light Ld due to a secular change or the like of the opening detection light source 22.

  Further, in the optical information reading apparatus 10 according to the present embodiment, power supply for executing the above-described reading process is started or cut off (power-on operation or power supply) to the control circuit 40. A comparison for detecting opening of the housing 11 is performed. As described above, when the power is turned on or off, which is the optimal timing for detection of opening, the detection irradiation light Ld is irradiated and the signal pattern P is compared with the opening detection pattern Pd. The power consumption for detection can be kept low.

  Further, in the optical information reading apparatus 10 according to the present embodiment, the unsealing detection light source 22 is mounted on the other side surface 23b of the light source substrate 23 on which the reading light source 21 is mounted on one side surface 23a. As described above, since both the light source 22 for detecting opening and the light source 21 for reading are arranged on one light source substrate 23, the manufacturing cost can be reduced as compared with the case where the respective light sources are provided on separate substrates. Can do. Furthermore, since the unsealing detection light source 22 and the reading light source 21 having the same light emitting function are arranged on one light source substrate 23, the unsealing detection light source 22 is part of a mechanism for unsealing detection. It can be made harder to grasp.

In addition, this invention is not limited to the said embodiment, You may actualize as follows, and even in that case, an effect | action and effect equivalent to the said embodiment are acquired.
(1) The optical information reader 10 may be a code reader capable of reading a two-dimensional code such as a QR code, for example. In this case, the light receiving sensor 28 is configured by two-dimensionally arranging a plurality of light receiving elements such as a CCD. The opening detection pattern is set according to the signal pattern of the received light signal output from the light receiving sensor 28 when the housing 11 is not opened. Then, the opening of the housing 11 may be detected in accordance with a comparison between the opening detection pattern and the signal pattern at the time of housing opening determination.

(2) The first rib 12a and the second rib 13a are not limited to being formed in a flat plate shape, and may be formed in a columnar shape, for example. Further, the first rib 12a and the second rib 13a may be formed to have a predetermined gap with respect to the back side case 13 from which the annular protrusion 13b is eliminated and the front side case 12 from which the annular protrusion 12b is eliminated.

(3) FIG. 8 is a flowchart illustrating the flow of an unauthorized opening detection process according to a modification of the present embodiment.
In the unauthorized opening detection process described above, the flowchart of FIG. 8 may be adopted instead of the flowcharts shown in FIGS. In the unauthorized opening detection process based on the flowchart of FIG. 8, the subroutine of the determination process and the opening detection pattern setting process in step S103 is abolished, and the determination process in step S112 is newly added.

  In the determination process in step S112, it is determined whether or not the opening detection pattern Pd is stored in the memory 35. If the opening detection pattern Pd is not stored in the memory 35 (Yes in S112), the determination in step S113 is performed. The process of step S115 is performed without performing the determination process. Thus, if the opening detection pattern Pd is not stored in the memory 35, the signal pattern P stored in step S109 may be set as the opening detection pattern Pd.

It is explanatory drawing which shows the structure outline | summary of the optical information reader which concerns on this embodiment. It is sectional drawing which shows the 2-2 cross section of FIG. FIG. 2 is a block diagram illustrating an electrical configuration of the optical information reading device in FIG. 1. It is a flowchart which illustrates the flow of an unauthorized opening detection process. 5 is a flowchart illustrating a detection pattern setting process subroutine of FIG. 4. It is explanatory drawing which illustrates pattern Pd for opening detection. It is explanatory drawing which illustrates the signal pattern of the received light signal in the state where the housing | casing was opened. It is a flowchart which illustrates the flow of the unauthorized opening detection process which concerns on the modification of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Optical information reader 11 ... Housing | casing 12 ... Front side case (1st case)
12a ... 1st rib (1st protrusion part)
13 ... Back side case (second case)
13a ... 2nd rib (2nd protrusion part)
20 ... Circuit unit 21 ... Reading light source (first light emitting means)
22 ... Opening detection light source (second light emitting means)
23. Light source substrate (substrate)
23a ... one side 23b ... other side (light receiving means side of the substrate)
28. Light receiving sensor (light receiving means)
35 ... Memory (reading means)
40. Control circuit (reading means)
B ... Information code Lr ... Reflected light Ld ... Detection irradiation light P ... Signal pattern Pd ... Opening detection pattern (predetermined signal pattern)
S: Light receiving surface (light receiving area)
Si ... Imaging area So ... Outside imaging area

Claims (4)

A first light emitting means for irradiating the information code with light;
A light receiving means for receiving reflected light irradiated by the first light emitting means and reflected by the information code in a light receiving region and outputting a light receiving signal corresponding to the reflected light;
Reading means for reading the information code based on the light reception signal from the light receiving means;
Storage means for storing information acquired by the reading process;
A housing configured by assembling the first case and the second case, and housing at least the storage means and the light receiving means;
An optical information reader comprising:
A second light emitting means disposed in the housing and radiating detection light to the light receiving region;
A first projecting portion projecting from the first case so as to pass between a part of a non-imaging area different from the imaging area to which the reflected light reaches in the light receiving area and the second light emitting means; ,
A second projecting portion projecting from the second case so as to pass between the other part of the imaging outside region and the second light emitting means,
The reading unit opens the housing based on a comparison between a pattern of the light reception signal output from the light receiving unit and a predetermined signal pattern in response to the detection light emitted from the second light emitting unit. An optical information reader characterized by detecting.   The predetermined signal pattern is determined based on a comparison between the light reception signal pattern output from the light receiving means and the predetermined signal pattern in response to the detection irradiation light from the second light emitting means. 2. The optical information reading apparatus according to claim 1, wherein when the unsealing is not detected, the optical information reading apparatus is updated so as to be equal to the pattern of the light reception signal at the time of the comparison.   3. The optical information reading according to claim 1, wherein the reading unit performs the comparison for detecting opening of the housing at the time of starting or cutting off power supply to the reading unit. apparatus.   The optical information reader according to claim 1, wherein the second light emitting unit is disposed on a light receiving unit side of a substrate on which the first light emitting unit is disposed. .

Images