JPWO2010100852A1 - Discrimination sensor, electronic device and monitoring system, and subject discrimination method - Google Patents

Abstract

The discrimination sensor of the present invention has a high S / N ratio from an electromagnetic wave transmitting unit that transmits an electromagnetic wave toward a subject, an electromagnetic wave receiving unit that can receive an electromagnetic wave from the subject, and an electromagnetic wave received by the electromagnetic wave receiving unit. An analysis unit that extracts a specific electromagnetic wave having a specific frequency or frequency band and discriminates a subject based on the specific electromagnetic wave.

Description

  The present invention relates to a discrimination sensor that discriminates a subject, an electronic apparatus and a monitoring system including the discrimination sensor, and a subject discrimination method.

  In recent years, electronic devices typified by mobile terminals and personal computers have become increasingly multifunctional and highly functional. Accordingly, the utility value of electronic devices that make people's lives more convenient is increasing. In order to realize an electronic device that can be used comfortably and safely even by a person who does not have specialized knowledge, there is a need for a technology in which the electronic device itself senses the surrounding situation, particularly the human body, and performs recognition, judgment, and processing. As means for sensing an object such as a human body or other objects, there are sensors that use a change in capacitance and sensors that detect a change in heat. These sensors are applied to, for example, automatic lighting devices for lighting devices. These sensors have problems of versatility such as false detection other than the target detection target and installation conditions are limited. In addition, these sensors have a problem of increased mounting volume and product cost due to accompanying parts such as a lens necessary for expanding the detection range.

  As another means for sensing an object, a system is proposed that includes a transmission antenna that transmits electromagnetic waves, a reception antenna that receives electromagnetic waves, and a determination unit that determines the presence or absence of an intruder based on the electromagnetic waves received by the reception antenna. (For example, refer to Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-140223

  However, even a sensor using electromagnetic waves as in Patent Document 1 has a problem that its discrimination sensitivity is low and there are many false detections. A discrimination sensor capable of discriminating a subject with high sensitivity has been desired.

  The present invention has been made in view of the above-described circumstances, and provides a discrimination sensor, an electronic device and a monitoring system, and a subject discrimination method capable of discriminating a subject with high sensitivity. is there.

  In order to solve the above problems, a discrimination sensor according to the present invention includes an electromagnetic wave transmission unit that transmits an electromagnetic wave toward a subject, an electromagnetic wave reception unit that can receive an electromagnetic wave from the subject, and reception by the electromagnetic wave reception unit. An analysis unit that extracts a specific electromagnetic wave having a specific frequency or frequency band having a high S / N ratio from the electromagnetic wave and discriminates the subject based on the specific electromagnetic wave.

  The subject discrimination method of the present invention includes an electromagnetic wave transmitting step of transmitting an electromagnetic wave toward the subject, an electromagnetic wave receiving step of receiving an electromagnetic wave input from the subject by performing the electromagnetic wave transmitting step, and the electromagnetic wave An analysis step of extracting a specific electromagnetic wave having a specific frequency or frequency band having a high S / N ratio from the electromagnetic wave received in the reception step and discriminating the subject.

  According to the present invention, it is possible to discriminate a subject with high sensitivity and prevent erroneous detection.

It is a block diagram which shows the discrimination sensor of the 1st Embodiment of this invention. 4 is a graph showing the relationship between the frequency and intensity of an electromagnetic wave oscillated from an oscillation circuit in the discrimination sensor according to the first embodiment of the present invention. In the discrimination sensor of a 1st embodiment of the present invention, it is a graph which shows the relation between the frequency and intensity of electromagnetic waves received with a receiving antenna. It is a flowchart which shows the discrimination procedure in the discrimination sensor of the 1st Embodiment of this invention. In the discrimination sensor of a 1st embodiment of the present invention, it is a graph which shows the relation between the physical relationship of a subject and a receiving antenna, and the intensity of electromagnetic waves received with a receiving antenna. It is a block diagram which shows the discrimination sensor of the modification of the 1st Embodiment of this invention. It is a perspective view which shows the portable terminal of the 2nd Embodiment of this invention. It is a block diagram which shows the portable terminal of the 2nd Embodiment of this invention. It is sectional drawing which shows the internal structure of the microphone side housing | casing of the portable terminal of the 2nd Embodiment of this invention. It is a flowchart which shows a discrimination and a control procedure in the portable terminal of the 2nd Embodiment of this invention. It is a perspective view which shows the portable terminal of the 3rd Embodiment of this invention. It is a block diagram which shows the portable terminal of the 3rd Embodiment of this invention. It is sectional drawing which shows the internal structure of the microphone side housing | casing of the portable terminal of the 3rd Embodiment of this invention. It is a flowchart which shows a discrimination and a control procedure in the portable terminal of the 3rd Embodiment of this invention. It is a perspective view which shows the portable terminal of the 4th Embodiment of this invention. It is a block diagram which shows the portable terminal of the 4th Embodiment of this invention. It is sectional drawing which shows the internal structure of the receiver side housing | casing of the portable terminal of the 4th Embodiment of this invention. It is a flowchart which shows a discrimination and a control procedure in the portable terminal of the 4th Embodiment of this invention. It is a perspective view which shows the mobile terminal of the 5th Embodiment of this invention. It is a perspective view which shows a detection unit in the mobile terminal of the 5th Embodiment of this invention. It is sectional drawing which shows a detection unit in the mobile terminal of the 5th Embodiment of this invention. It is a block diagram which shows the mobile terminal of the 5th Embodiment of this invention. It is a flowchart which shows a discrimination and a control procedure in the mobile terminal of the 5th Embodiment of this invention. It is the schematic which shows the monitoring system of the 6th Embodiment of this invention. It is a block diagram which shows the monitoring system of the 6th Embodiment of this invention. It is a flowchart which shows the monitoring procedure in the monitoring system of the 6th Embodiment of this invention. It is the schematic which shows the modification of a detection range in the monitoring system of the 6th Embodiment of this invention. In the monitoring system of the 6th Embodiment of this invention, it is the schematic which shows another modification of a detection range.

(First embodiment)
A first embodiment according to the present invention will be described with reference to FIGS. FIG. 1 shows a discrimination sensor 1 of the present embodiment. As shown in FIG. 1, the discrimination sensor 1 of this embodiment discriminates a subject P including a human body and a test object other than the human body. The discrimination sensor 1 includes an electromagnetic wave transmission unit 2 that transmits an electromagnetic wave E1 toward the subject P, an electromagnetic wave reception unit 3 that can receive the electromagnetic wave E2 from the subject P, and an electromagnetic wave E2 that is received by the electromagnetic wave reception unit 3. And an analysis unit 4 that extracts a specific electromagnetic wave Es of a specific frequency or frequency band f _s having a high S / N ratio and discriminates the subject P based on the specific electromagnetic wave Es.

The electromagnetic wave transmission unit 2 includes an oscillation circuit 2a and a transmission antenna 2b. The oscillation circuit 2a functions as an oscillation source that oscillates the electromagnetic wave E1 including the frequency or frequency band f _s of the specific electromagnetic wave Es extracted by the signal processing unit 4a of the analysis unit 4 described later. The transmission antenna 2b transmits the electromagnetic wave E1 generated by the oscillation circuit 2a. FIG. 2 shows the electromagnetic wave intensity frequency characteristics in the reference state where the subject P of the electromagnetic wave E1 oscillated from the oscillation circuit 2a does not exist. The electromagnetic wave receiving unit 3 includes a receiving antenna 3a that can receive the electromagnetic wave E2 from the subject P, and an amplification circuit 3b that amplifies the electromagnetic wave E2 received by the receiving antenna 3a.

The analysis unit 4 includes a signal processing unit 4a and a determination unit 4b. The signal processing unit 4a extracts a specific electromagnetic wave Es of S / N higher specific frequency or frequency band f _s of ratio from the electromagnetic wave E2 which is received by the electromagnetic wave receiving unit 3. The determination unit 4b discriminates the subject P based on the specific electromagnetic wave Es extracted by the signal processing unit 4a. The analysis unit 4 includes a threshold value setting unit 4c that sets a threshold value a regarding the intensity of the specific electromagnetic wave Es, and a storage unit 4d that stores the threshold value a input by the threshold value setting unit 4c. The determination unit 4b refers to the threshold value a stored in the storage unit 4d, compares the intensity of the specific electromagnetic wave Es with respect to the threshold value a, and discriminates the subject P. More specifically, in this embodiment, when the intensity of the specific electromagnetic wave Es is greater than or equal to the threshold value a, the determination unit 4b has the subject P in the transmission range of the electromagnetic wave E1 by the transmission antenna 2b of the electromagnetic wave transmission unit 2 Then, when the intensity of the specific electromagnetic wave Es is less than the threshold value a, it is determined that the subject P does not exist.

The frequency or frequency band f _s of the specific electromagnetic wave Es extracted by the signal processing unit 4a of the analysis unit 4 is set so as to satisfy the following formula 1 according to the resonance frequency f ₀ of the oscillation circuit 2a of the electromagnetic wave transmission unit 2 It is preferable that

FIG. 3 shows the ratio α (= f / f ₀ ) of the frequency f of the electromagnetic wave E2 received by the reception antenna 3a to the resonance frequency f ₀ of the oscillation circuit 2a and the received electromagnetic wave by the discrimination sensor 1 of the present embodiment. The relationship with the intensity | strength of E2 is shown. The distance between the subject P and the transmission antenna 2b and the reception antenna 3a is set to 20 mm. In FIG. 3, an electromagnetic wave E1 having an intensity I ₀ or less is background noise BN. As shown in FIG. 3, in the frequency region where the ratio α is 0.75 or more and 1.25 or less, it can be seen that the detection intensity is high and the S / N ratio is very high compared to other regions. On the other hand, when the ratio α is less than 0.75 and greater than 1.25, it can be seen that the detection intensity is low and the S / N ratio is deteriorated. Therefore, from the viewpoint of improving the S / N ratio, to extract a specific wave Es of Equation 1 satisfy the frequency or frequency band f _s, it is preferable to discriminate the subject P based on the specific electromagnetic waves Es.

Next, the operation of the discrimination sensor 1 of this embodiment will be described.
As shown in FIG. 4, as an electromagnetic wave transmission step S1, an electromagnetic wave E1 including the specific frequency or frequency band f _s is oscillated from the oscillation circuit 2a of the electromagnetic wave transmission unit 2, and this electromagnetic wave E1 is transmitted via the transmission antenna 2b. Radiates into space. When the subject P is present in the transmission range of the transmission antenna 2b, the electromagnetic wave E1 is partially absorbed by the subject P, while the other is reflected / scattered, thereby being reflected / scattered. The intensity changes. In the electromagnetic wave receiving step S2, a part of the electromagnetic wave E2 reflected / scattered by the subject P is received by the receiving antenna 3a of the electromagnetic wave receiving unit 3, amplified by the amplifier circuit 3b, and then transmitted to the signal processing unit 4a of the analyzing unit 4 Entered.

Next, as the analysis step S3, the received electromagnetic wave E2 is analyzed.
That is, the signal processing unit 4a extracts, from the input electromagnetic wave E2, a specific electromagnetic wave Es of a specific frequency or frequency band f _s that is preferably in the range shown in Equation 1 (step S3a). The determination unit 4b refers to the threshold value a stored in the storage unit 4d and compares the threshold value a with the intensity of the specific electromagnetic wave Es. The determination unit 4b determines that the subject P exists in the transmission range of the electromagnetic wave transmission unit 2 when the intensity of the specific electromagnetic wave Es is greater than or equal to the threshold value a, and the intensity of the specific electromagnetic wave Es is less than the threshold value a. Determines that the subject P does not exist within the transmission range of the electromagnetic wave transmission unit 2 (step S3b).

According to the discrimination sensor 1 as described above, the analysis unit 4 extracts the specific electromagnetic wave Es of a specific frequency or frequency band f _s having a high S / N ratio, and the subject P is detected with high sensitivity based on the specific electromagnetic wave Es. Can be discriminated. Therefore, erroneous detection can be prevented. In particular, the subject P can be discriminated with higher sensitivity when the frequency or frequency band f _{s of} the specific electromagnetic wave Es to be extracted satisfies the expression (1). As shown in FIG. 5, for example, a human body P1 is set as the subject P, and the intensity that is not detected even when other objects P2 and P3 are close to each other is set as the threshold value a. If the threshold value a is set in this way, the presence or absence of other objects P2 and P3 is determined in a range where the distance is smaller than a predetermined distance at which the intensity of the electromagnetic wave E2 received after attenuation becomes less than the threshold value a. The presence or absence of the human body P1 can be accurately determined without being affected.

  In the above, the presence or absence of the subject P is discriminated by comparing the magnitude of the specific electromagnetic wave Es and the threshold value a. Instead of this, the distance from the receiving antenna 3a to the subject P may be discriminated. For example, referring to FIG. 5, the intensity of the specific electromagnetic wave Es at a predetermined distance L1 is measured in advance, and the threshold value a is set based on the measured intensity. By setting in this way, it is possible to determine whether the distance to the existing subject P as well as the presence or absence of the subject P is within a predetermined distance L1.

In the above embodiment, the intensity of the specific electromagnetic wave Es is evaluated as it is and the discrimination of the subject P is determined. However, the present invention is not limited to this.
FIG. 6 shows a modification of this embodiment. In this modification, the intensity of the electromagnetic wave E1 oscillated by the oscillation circuit 2a is input to the determination unit 4b. The determination unit 4b uses the intensity of the specific electromagnetic wave Es input from the signal processing unit 4a to oscillate the electromagnetic wave transmission unit 2. The subject P is discriminated by comparing the value normalized by the intensity of the electromagnetic wave E1 oscillated from the circuit 2a with the threshold value a set correspondingly. In this modification, it is possible to exclude the influence due to the fluctuation of the intensity of the electromagnetic wave E1 to be transmitted, and to discriminate the subject P with higher sensitivity.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. 7 to 10 show a second embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  7 and 8 show a portable terminal as an electronic apparatus provided with the discrimination sensor according to the embodiment of the present invention. As illustrated in FIGS. 7 and 8, the mobile terminal 10 includes a microphone-side casing 11 that inputs sound, a receiver-side casing 12 that outputs sound, a microphone-side casing 11, and a receiver-side casing 12. And a movable hinge 13 that is rotatably supported. The microphone-side casing 11 and the receiver-side casing 12 have casing dimensions of, for example, a width W50 (mm), a length L90 (mm), and a thickness T10 (mm) from the viewpoint of usability and storage. is doing. In the receiver-side housing 12, a display unit 14 that displays various types of information is provided on a surface 12 a that overlaps the microphone-side housing 11 in a folded state. A receiver 15, a speaker 16, and a communication control unit 17 are provided inside the receiver side housing 12. The receiver 15 and the speaker 16 output sound corresponding to the electromagnetic wave input to the electromagnetic wave input / output unit 19 described later. The communication control unit 17 controls the receiver 15 and the speaker 16.

  In the microphone-side casing 11, a microphone 11 capable of inputting voice and an input unit 18 capable of inputting various inputs are provided on a surface 11 a that overlaps the receiver 15 -side casing 12 in a folded state. An electromagnetic wave input / output unit 19 capable of transmitting and receiving electromagnetic waves for communication and a discrimination sensor 20 for discriminating a user as a subject P are provided inside the microphone-side casing 11. The electromagnetic wave input / output unit 19 includes a communication oscillation circuit 19a that oscillates a transmission electromagnetic wave, and a communication antenna 19b that can transmit and receive the electromagnetic wave.

  The discrimination sensor 20 has basically the same configuration as that of the first embodiment. The discrimination sensor 20 includes an electromagnetic wave transmission unit 2 including an oscillation circuit 2a and a transmission antenna 2b, an electromagnetic wave reception unit 3 including a reception antenna 3a and an amplification circuit 3b, an analysis including a signal processing unit 4a, a determination unit 4b, and a storage unit 4d. With part 4. The discrimination sensor 20 is different from the first embodiment in that the electromagnetic wave transmission unit 2 also serves as the electromagnetic wave input / output unit 19 that transmits electromagnetic waves for communication. That is, the communication oscillation circuit 19a constitutes the oscillation circuit 2a, and the communication antenna 19b constitutes the transmission antenna 2b. The user is discriminated as the subject P by the electromagnetic wave transmitted by the electromagnetic wave input / output unit 19.

  As shown in FIG. 9, the receiving antenna 3 a of the electromagnetic wave receiving unit 3 has an adhesive 21 on the back surface 11 b of the front surface 11 a provided with the input unit 18 of the microphone-side housing 11 where the user approaches when using the mobile terminal. Is fixed through. The receiving antenna 3a is made of, for example, copper. The receiving antenna 3a may be formed using a conductor such as carbon or another metal body, or a radio wave absorber in which a ceramic or metal is contained in a resin.

  In the storage unit 4d of the analysis unit 4, in this embodiment, a first threshold value a1, a second threshold value a2 that is larger than the first threshold value a1, and two threshold values are stored. Specifically, the two threshold values are a first threshold value a1 and a second threshold value a2 that is larger than the first threshold value a1. The determination unit 4b of the analysis unit 4 compares the magnitude of the specific electromagnetic wave Es extracted by the signal processing unit 4a with the first threshold value a1 and the second threshold value a2. The first threshold value a1 corresponds to the intensity of the specific electromagnetic wave Es when the distance between the receiving antenna 3a and the user becomes the limit of listening by the receiver 15. The second threshold value a2 corresponds to the intensity of the specific electromagnetic wave Es when the receiver 15 can hear the voice but is a distance that requires a certain volume. The determination result determined by the determination unit 4b of the analysis unit 4 is input to the communication control unit 17, and based on the determination result, the communication control unit 17 receives audio from the receiver 15 or the speaker 16 at a predetermined volume. Is output.

  In the portable terminal 10 of this embodiment, a case where the determination unit 4b of the discrimination sensor 20 determines that the intensity of the specific electromagnetic wave Es is equal to or greater than the second threshold value a2 will be described. In this case, as shown in FIG. 10 and Table 1, the communication control unit 17 assumes that the distance between the user and the mobile terminal 10 is a short distance, and sets the volume of the receiver 15 in advance in the normal call mode, for example, in advance. The set vol. 1 to vol. Vol.5, which is the second from the bottom of the five levels of volume. 2, the sound is output from the receiver 15 (step S4a).

  A case will be described in which the determination unit 4b of the discrimination sensor 20 determines that the intensity of the specific electromagnetic wave Es is greater than or equal to the first threshold value a1 and less than the second threshold value a2. In this case, the communication control unit 17 assumes that the distance between the user and the mobile terminal 10 is a medium distance, and sets the volume of the receiver 15 to the maximum volume in the normal call mode. 5, the sound is output from the receiver 15 (step S4b). For this reason, even if the user and the mobile terminal 10 are separated from each other to some extent, the user can appropriately listen to the sound without having to adjust the volume by himself.

  A case where the determination unit 4b of the discrimination sensor 20 determines that the intensity of the specific electromagnetic wave Es is less than the first threshold a1 will be described. In this case, the communication control unit 17 assumes that the distance between the user and the mobile terminal 10 is a long distance and sets the volume of the speaker 16 to the maximum volume in the hands-free mode. 5, the sound is output from the speaker 16 (step S4c). For this reason, even if the user is away to the extent that it is difficult to listen to the receiver 15 in the normal call mode, the user can automatically switch to the voice output by the speaker 16 and appropriately listen to the voice in the hands-free mode. it can. In the present embodiment, the electromagnetic wave transmission / reception unit 19 of the discrimination sensor 20 also serves as the electromagnetic wave transmission / reception unit 19 for communication, so that the number of components can be reduced, and downsizing and cost reduction can be achieved. The volume setting is an example, and is not limited to this. For example, the volume at each distance may be set in proportion to the volume manually set by the user.

  In this embodiment, based on the determination result of the determination unit 4b of the discrimination sensor 20, the switching between the receiver 15 and the speaker 16 and the volume adjustment according to the distance to the user are performed, but the present invention is not limited to this. . For example, on the basis of the determination result of the determination unit 4b of the discrimination sensor 20, control of power control switching or screen display for calling attention to the display unit 14 may be performed according to the distance to the user. .

(Third embodiment)
Next, a third embodiment of the present invention will be described. 11 to 14 show a third embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

11 and 12 show a portable terminal 30 as an electronic device including the discrimination sensor according to the embodiment of the present invention. As shown in FIGS. 11 and 12, the mobile terminal 30 of this embodiment includes a microphone-side casing 11, a receiver-side casing 12, and a movable hinge 13. The microphone-side casing 11 is provided with a discrimination sensor 33 as an input unit 31 for performing various inputs. The discrimination sensor 33 includes an electromagnetic wave transmission unit 2, a plurality of electromagnetic wave reception units 3 </ b> A to 3 </ b> L, and an analysis unit 4. The electromagnetic wave transmission unit 2 includes an oscillation circuit 2a and a transmission antenna 2b. The electromagnetic wave receivers 3 </ b> A to 3 </ b> L can receive electromagnetic waves from a user who is the subject P. The analysis unit 4 is provided corresponding to each of the electromagnetic wave reception units 3A to 3L, and specifies a specific frequency or frequency band f _s having a high S / N ratio from the electromagnetic wave E2 received by the corresponding electromagnetic wave reception units 3A to 3L. The electromagnetic wave Es is extracted, and the human body is discriminated as the subject P based on the specific electromagnetic wave Es.

  As in the second embodiment, the electromagnetic wave transmission unit 2 also serves as an electromagnetic wave input / output unit 19 for communication. In the present embodiment, as shown in FIG. 13, a plurality of receiving antennas 3 a of the plurality of electromagnetic wave receiving units 3 </ b> A to 3 </ b> B are arranged on the back surface 11 b of the microphone-side housing 11. Each receiving antenna 3 a is fixed by an adhesive layer 21. In this embodiment, twelve electromagnetic wave receiving units are provided. These twelve receiving antennas 3a of the electromagnetic wave receiving unit are arranged so that, for example, there are four rows in the width direction and three rows in the length direction so as to be operation buttons as the input unit 31.

As shown in FIG. 14, each signal processing unit 4 a of each analysis unit 4 </ b> A to 4 </ b> L has a specific frequency or frequency band f _s having a high S / N ratio from the electromagnetic waves input from the corresponding electromagnetic wave reception units 3 </ b> A to 3 </ b> L. The specific electromagnetic wave Es is extracted and input to the corresponding determination unit 4b. Each determination unit 4b refers to the storage unit 4d, compares the threshold value with the intensity of the input specific electromagnetic wave Es, and determines the presence or absence of the user who is the subject. A determination result is input from each determination unit 4 b to the operation processing unit 34 provided inside the microphone-side casing 11. In the present embodiment, the storage unit 4d is provided in common to the analysis units 4A to 4L. Instead of this, the storage unit 4d may also be provided corresponding to each electromagnetic wave transmission unit. As shown in FIG. 14, in the operation processing unit 34, based on the determination results of the determination units 4 b of the analysis units 4 </ b> A to 4 </ b> L, it is confirmed that the user's finger or the like is close to the corresponding reception antenna 3 a. In that case, the operation assigned to the receiving antenna 3a is performed (step S5).

  That is, in the mobile terminal 30 of the present embodiment, it is extracted when the reception antenna 3a of each of the electromagnetic wave reception units 3A to 3L is provided, for example, when the user's finger or the like is close to the surface 11a. The threshold value is set so that the intensity of the specific electromagnetic wave Es is equal to or greater than the threshold value stored in the storage unit 4d. With this configuration, the receiving antenna 3a can function as the input unit 31 instead of the plurality of operation buttons. For this reason, it is not necessary to provide an opening in the housing like an operation button, and to insert the button main body into the opening so as to be able to advance and retreat. Just arrange them. For this reason, the rigidity of a housing | casing can be improved and it is effective also in terms of waterproofing and dustproofing.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. 15 to 18 show a fourth embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

15 and 16 show a portable terminal as an electronic apparatus including the discrimination sensor according to the embodiment of the present invention. As shown in FIGS. 15 and 16, the mobile terminal 40 of this embodiment includes a microphone-side casing 11, a receiver-side casing 12, and a movable hinge 13. The portable terminal 40 further includes a discrimination sensor 41 that determines the skin quality of the user's cheek. The discrimination sensor 41 includes an electromagnetic wave transmission unit 2, a plurality of electromagnetic wave reception units 3, and an analysis unit 42. The electromagnetic wave transmission unit 2 includes an oscillation circuit 2a and a transmission antenna 2b. The electromagnetic wave receiving unit 3 can receive an electromagnetic wave from the user as the specimen P. The analysis unit 42 extracts a specific electromagnetic wave Es of a specific frequency or frequency band f _s having a high S / N ratio from the electromagnetic wave E2 received by the electromagnetic wave receiving unit 3, and based on the specific electromagnetic wave Es, a human body is detected as the subject P. Discriminate.

  As shown in FIG. 17, the receiving antenna 3 a of the electromagnetic wave receiving unit 3 is provided on the back surface 12 b of the front surface 12 a on which the display unit 14 of the receiver-side housing 12 is provided via an adhesive layer 21. A distance holding unit 43 that maintains a constant distance from the subject P is provided in a corresponding range of the surface 12a. Specifically, in the present embodiment, the distance holding portion 43 is a recess formed in a corresponding range of the surface 12a. By this recess, the distance between the user's cheek that contacts the surface 12a and the receiving antenna 3a can be kept constant.

The analysis unit 42 includes a signal processing unit 4a, a determination unit 4b, a calibration data storage unit 44, a measurement data storage unit 45, and an image generation unit 46. The signal processing unit 4a extracts a specific electromagnetic wave Es of S / N higher specific frequency or frequency band f _s of ratio from the electromagnetic wave E2 which is received by the electromagnetic wave receiving unit 3. The determination unit 4b determines the skin quality of the user as the subject P based on the specific electromagnetic wave Es extracted by the signal processing unit 4a. The calibration data storage unit 44 stores skin condition calibration data indicating the relationship between the intensity of the specific electromagnetic wave Es and the moisture content (content of a specific substance) of the cheek of the human body that is the subject P. The measurement data storage unit 45 stores the intensity of the specific electromagnetic wave Es corresponding to the skin condition extracted in the past by the signal processing unit 4a. The image generation unit 46 images the determination result by the determination unit 4 b and the intensity Es of the specific electromagnetic wave representing the skin state stored in the measurement data storage unit 45.

  As shown in FIG. 18, the determination unit 4b refers to the skin condition calibration data in the calibration data storage unit 44, and determines the current skin condition from the intensity of the specific electromagnetic wave Es and the skin condition calibration data (step S3b). Moreover, the intensity | strength of the specific electromagnetic wave Es extracted by the signal processing part 4a is memorize | stored in the measurement data memory | storage part 45 as skin state data at the time of each measurement (step S6). And the image generation part 46 produces | generates the image data for displaying the present skin condition and the time-dependent change of a skin condition from the determination result by the determination part 4b each input, and the skin condition data of the measurement data storage part 45 Are output and displayed on the display unit 14 (step S7).

  In this embodiment, the user's skin condition can be determined using the basic function of voice transmission / reception of the mobile terminal 40. Table 2 shows the determination result of the moisture amount by the discrimination sensor 41 of the present embodiment and the measurement result of the moisture amount by the conventional moisture sensor. As shown in Table 2, there is a correlation between the two values, and it can be seen that the difference in the amount of moisture on the skin surface of each subject can be measured with high sensitivity.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. 19 to 23 show a fifth embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  As shown in FIGS. 19 to 22, a mobile terminal 50 that is an electronic device of the present embodiment is connected to a main body 51 capable of performing an input operation and various displays, and is detachably connected to the main body 51. A detection unit 52. The main body 51 includes a first housing 54, a second housing 56, and a movable hinge 57. A display unit 53 is provided in the first housing 54. The second housing 56 is provided with an input unit 55 such as a keyboard. The movable hinge 57 connects the first housing 54 and the second housing 56 so as to be rotatable.

  A power control unit 58 that supplies power and a wireless LAN unit 59 that is an electromagnetic wave input / output unit capable of transmitting and receiving electromagnetic waves to and from the outside are built in the second housing 56. The wireless LAN unit 59 includes a communication oscillation circuit 59a that oscillates transmission electromagnetic waves, and a communication antenna 59b that can transmit and receive electromagnetic waves. A USB port 60 is provided on the side surface of the second housing 56 as a connection unit that can connect the power control unit 58 and the wireless LAN unit 59 to the outside.

The detection unit 52 includes a USB connector 61, an electromagnetic wave reception unit 3, and an analysis unit 4. The USB connector 61 functions as a connection unit that can be attached to and detached from the main body unit 51. The electromagnetic wave receiver 3 is connected to the USB connector 61 and can receive electromagnetic waves from the subject P. Interpretation unit 4, from the electromagnetic wave E1 received by the electromagnetic wave receiving unit 3 extracts a specific electromagnetic wave Es of S / high specific frequency of N ratio or the frequency band f _s, discriminate the subject P based on the specific electromagnetic waves Es To do.

The electromagnetic wave receiver 3 includes a receiving antenna 3a and an amplifier circuit 3b. The analysis unit 4 includes a signal processing unit 4a, a determination unit 4b, and a storage unit 4c. In a state where the main body 51 and the detection unit 52 are connected, the wireless LAN unit 59 is used as the electromagnetic wave transmission unit 2, and the wireless LAN unit 59 of the main body 51, the electromagnetic wave reception unit 3 and the analysis unit 4 of the detection unit 52 are used. A discrimination sensor 65 is configured.
Each configuration of the detection unit 52 is driven by receiving power supply from the power control unit 58 of the main body 51 via the USB connector 61.

  As shown in FIG. 23, the electromagnetic wave E1 is transmitted from the communication antenna 59b of the wireless LAN unit 59 (step S1). Of the electromagnetic wave E1, the electromagnetic wave E2 reflected and scattered by the user using the terminal unit 50 as the subject P is received by the receiving antenna 3a of the electromagnetic wave receiving unit 3 provided in the detection unit 52. Next, the electromagnetic wave E2 is amplified by the amplifier circuit 3b and input to the signal processing unit 4a of the analysis unit 4 (step S2). The signal processing unit 4a of the analysis unit 4 extracts the specific electromagnetic wave Es from the input electromagnetic wave E2 (step S3a). The extracted specific electromagnetic wave Es is compared with the threshold value stored in the storage unit 4d by the determination unit 4b (step S3b). When the intensity of the specific electromagnetic wave Es is equal to or greater than the threshold, the determination unit 4b determines that there is an object as a user of the terminal unit. On the other hand, when the intensity of the specific electromagnetic wave Es is smaller than the threshold value, the determination unit 4b determines that there is no subject as a user of the terminal unit. These determination results are input to the power control unit 58 via the USB connector 61. When the determination result that the user is present is input, the power control unit 58 supplies power to the display unit 53 and performs display on the display unit 53 (step S8a). On the other hand, when the determination result that the user does not exist is input, the power control unit 58 does not supply power to the display unit 53 and does not display the display unit 53 (step S8b).

  As in the mobile terminal 50 of this embodiment, it is possible to save power by detecting the presence / absence of a user using the discrimination sensor 65 and switching the presence / absence of power supply. Further, in the present embodiment, by configuring the detection unit 52 to be detachable from the main body 51 of the mobile terminal 50, it is possible to provide a power saving function to the normal mobile terminal 50. Further, the detection unit 52 can be downsized by using the wireless LAN unit 59 on the main body 51 side as the electromagnetic wave transmission unit 2 of the discrimination sensor 65. In this embodiment, the USB port 60 and the USB connector 61 are used as the connection unit. However, the present invention is not limited to this, and other connection units may be used. By using the USB connector 61, it is possible to supply power from the main unit 51 side. Instead, a configuration may be adopted in which a power source is provided on the detection unit 52 side.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described. 24 to 27B show a sixth embodiment of the present invention. In this embodiment, members that are the same as those used in the above-described embodiment are assigned the same reference numerals, and descriptions thereof are omitted.

  24 and 25 show the monitoring system of this embodiment. As shown in FIGS. 24 and 25, the monitoring system 80 monitors the presence or absence of an intruder in the monitoring room 70 serving as a monitoring area at a crime prevention management center 71 serving as another management area. The monitoring system 80 includes a detection signal transmission unit 81 and a detection unit 82 provided in the monitoring room 70, and a management unit 83 provided in the crime prevention management center 71. The detection signal transmission unit 81 includes an oscillation circuit 81a that oscillates electromagnetic waves and a transmission antenna 81b that transmits the electromagnetic waves oscillated from the oscillation circuit 81a. The detection signal transmission unit 81 constitutes the electromagnetic wave transmission unit 2 of the discrimination sensor according to the embodiment of the present invention as will be described later. The detection signal transmission unit 81 is provided in accordance with a desired detection range. In this embodiment, the detection signal transmission unit 81 is provided so as to be able to transmit to a detection range A set on the indoor side of the entrance 70a of the monitoring room 70, for example.

The detection unit 82 detects the presence of the intruder by receiving the electromagnetic wave E2 reflected and scattered by the intruder who becomes the subject P in the detection range A. The detection unit 82 includes an electromagnetic wave receiving unit 84 and an analysis unit 4. The electromagnetic wave receiving unit 84 receives the electromagnetic wave E2. The analysis unit 4 extracts a specific electromagnetic wave Es having a specific frequency or frequency band f _s having a high S / N ratio from the electromagnetic wave E2 received by the electromagnetic wave receiving unit 84, and discriminates the subject P based on the specific electromagnetic wave Es. To do. The detection signal transmission unit 81, the electromagnetic wave reception unit 84 and the analysis unit 4 of the detection unit 82 constitute a discrimination sensor 85 according to the embodiment of the present invention. In the present embodiment, in the electromagnetic wave receiving unit 84, the antenna that receives the electromagnetic wave E2 from the subject P is configured as a communication antenna 84a capable of transmitting and receiving electromagnetic waves. The determination result in the determination unit 4b is generated as an electromagnetic wave by the transmission circuit 86 and can be transmitted from the communication antenna 84a.

  The management unit 83 includes a reception antenna 83a, an image generation unit 83b, and a display unit 83c. The receiving antenna 83a can receive an electromagnetic wave transmitted from the communication antenna 83a of the detection unit 82. The image generation unit 83b images the electromagnetic wave received by the reception antenna 83a. The display unit 83c displays the image generated by the image generation unit 83b.

  As shown in FIG. 26, the electromagnetic wave E1 is transmitted from the transmission antenna 81a of the detection signal transmission unit 81 to the detection range A (step S1). When an intruder who is the subject P enters the detection range A, the electromagnetic wave E2 reflected and scattered by the intruder is received by the communication antenna 84a of the electromagnetic wave receiving unit 84, amplified by the amplifier circuit 3b, and the signal of the analyzing unit 4 The data is input to the processing unit 4a (step S2). The signal processing unit 4a of the analysis unit 4 extracts the specific electromagnetic wave Es from the input electromagnetic wave E2, and inputs the specific electromagnetic wave Es to the determination unit 4b (step S3a). The determination unit 4b refers to the threshold value stored in the storage unit 4d, and determines whether or not there is an intruder in the detection range A by comparing the intensity of the specific electromagnetic wave Es with the threshold value (step S3b). The determination unit 4 b inputs this determination result to the transmission circuit 86. The determination result is transmitted as the electromagnetic wave E3 through the transmission circuit 86 and the communication antenna 84a (step S9). The electromagnetic wave E3 transmitted from the communication antenna 84a is received by the reception antenna 83a of the management unit 83 in the crime prevention management center 71. The received electromagnetic wave E3 is generated as an image by the image generation unit 83b, and the determination result is displayed on the display unit 83c. For this reason, the manager in the crime prevention management center 71 can detect whether or not an intruder has entered the monitoring room 70 based on the determination result displayed on the display unit 83c.

  In this embodiment, although the determination result by the determination part 4b is displayed on the display part 83c of the management unit 83 of the crime prevention management center 71, it is not restricted to this. For example, an alarm device may be provided, and the alarm device may notify based on the determination result by the determination unit 4b. An alarm device may be activated also in the monitoring room 70, and the alarm device may be operated in combination with the display by the display unit 83c. In the present embodiment, the detection signal transmission unit 81 and the detection unit 82 are attached to the monitoring room 70 as separate device configurations. Instead of this, the detection signal transmission unit 81 and the detection unit 82 may be integrated.

  In the present embodiment, the detection range A is set corresponding to one entrance / exit 70a provided in the monitoring room 70. However, the present invention is not limited to this. For example, as shown in FIG. 27A, detection ranges A and B are set corresponding to each of the plurality of entrances 70a and 70b, and can be detected in each detection range A and B. 84 may be arranged. The detection range is not limited to the room of the monitoring room 70. The detection range may be outdoor. Alternatively, as shown in FIG. 27B, the detection range may be set so as to straddle the room.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2009-054000 for which it applied on March 6, 2009, and takes in those the indications of all here.

  The present invention can be applied to a discrimination sensor, an electronic apparatus and a monitoring system, and a subject discrimination method. According to the discrimination sensor, the electronic device and the monitoring system, and the subject discrimination method, the subject can be discriminated with high sensitivity, and erroneous detection can be prevented.

1, 41, 65, 85 Discrimination sensor 2 Electromagnetic wave transmission unit 3, 3A to 3L, 84 Electromagnetic wave reception unit 4, 4A to 4L, 42 Analysis unit 4b Determination unit 4d Storage unit 10, 30, 40 Mobile terminal (electronic device)
14 Display (electronic parts)
15 Receiver (electronic parts)
16 Speaker (electronic parts)
17 Communication control unit (control unit)
19 Electromagnetic wave input / output unit 34 Operation processing unit (control unit)
43 Distance holding unit 46 Image generating unit (control unit)
50 Mobile devices (electronic devices)
51 Main Unit 52 Detection Unit 53 Display Unit (Electronic Component)
58 Power control unit (control unit)
59 Wireless LAN unit (electromagnetic wave input / output unit)
70 Monitoring room (monitoring area)
83a Receiving antenna (receiving unit)
84a Communication antenna (transmitter)
E1, E2 Electromagnetic wave Es Specific electromagnetic wave P Subject

Claims (18)

An electromagnetic wave transmitter for transmitting electromagnetic waves toward the subject;
An electromagnetic wave receiving unit capable of receiving electromagnetic waves from the subject;
A discrimination sensor comprising: an analysis unit that extracts a specific electromagnetic wave having a specific frequency or frequency band having a high S / N ratio from the electromagnetic wave received by the electromagnetic wave reception unit, and discriminates the subject based on the specific electromagnetic wave. The discrimination sensor according to claim 1,
The electromagnetic wave transmission unit includes an oscillation source having a resonance frequency f ₀ that oscillates an electromagnetic wave to be transmitted toward the subject.
The analysis unit extracts the specific electromagnetic wave that satisfies the following expression as the specific frequency or frequency band f _s : 0.75 · f ₀ ≦ f _s ≦ 1.25 · f ₀
Discrimination sensor. The discrimination sensor according to claim 1 or 2,
The electromagnetic wave transmission unit is a discrimination sensor that transmits an electromagnetic wave including the specific frequency or frequency band. The discrimination sensor according to any one of claims 1 to 3,
The analysis unit includes a storage unit in which a threshold value of electromagnetic wave intensity is stored;
A discrimination sensor comprising: a determination unit that determines the presence or absence of the subject by comparing the intensity of the specific electromagnetic wave with respect to the threshold stored in the storage unit. The discrimination sensor according to any one of claims 1 to 3,
The analysis unit includes a storage unit in which a threshold value of electromagnetic wave intensity is stored;
A discrimination sensor comprising: a determination unit configured to compare the intensity of the specific electromagnetic wave with respect to the threshold stored in the storage unit and determine a distance to the subject. The discrimination sensor according to any one of claims 1 to 3,
The analysis unit includes a storage unit in which a threshold value of electromagnetic wave intensity is stored;
A discrimination sensor comprising: a determination unit that compares the threshold value stored in the storage unit with the intensity of the specific electromagnetic wave to determine the content of a specific substance included in the subject. The discrimination sensor according to any one of claims 1 to 6,
An electronic component that performs a predetermined operation;
An electronic device comprising: a control unit that controls the electronic component based on a discrimination result of the discrimination sensor. The discrimination sensor according to any one of claims 1 to 6,
An electronic component that performs a predetermined operation;
A control unit for controlling the electronic component based on the discrimination result of the discrimination sensor;
Equipped with an electromagnetic wave input / output unit that can send and receive electromagnetic waves to the outside,
The electromagnetic wave input / output unit is a communication terminal that also serves as the electromagnetic wave transmission unit of the discrimination sensor. The communication terminal according to claim 8,
A main body having the electronic component, the control unit and the electromagnetic wave input / output unit;
A communication terminal further comprising: a detection unit that includes the electromagnetic wave receiving unit and the analysis unit of the discrimination sensor and is detachably connected to the main body unit. The electronic device according to claim 7,
An electronic apparatus further comprising a distance holding unit that holds a distance between the electromagnetic wave receiving unit and the subject. In the communication terminal according to claim 8 or 9,
A communication terminal further comprising a distance holding unit that holds a distance between the electromagnetic wave receiving unit and the subject. The discrimination sensor according to claim 4 provided in a monitoring area for monitoring the subject;
A transmission unit for transmitting a determination result by the determination unit of the discrimination sensor;
A monitoring system comprising: a receiving unit that is provided outside the monitoring area and receives the determination result transmitted from the transmitting unit. An electromagnetic wave transmission step of transmitting an electromagnetic wave toward the subject;
An electromagnetic wave receiving step of receiving an electromagnetic wave input from the subject by performing the electromagnetic wave transmitting step;
A method for discriminating a subject, comprising: extracting a specific electromagnetic wave having a specific frequency or frequency band having a high S / N ratio from the electromagnetic wave received in the electromagnetic wave receiving step, and discriminating the subject. The object discrimination method according to claim 13,
In the electromagnetic wave transmission step, an electromagnetic wave is oscillated from an oscillation source having a predetermined resonance frequency f ₀ and transmitted toward the subject,
In the analysis step, the specific electromagnetic wave satisfying the following expression is extracted as the specific frequency or frequency band f _s : 0.75 · f ₀ ≦ f _s ≦ 1.25 · f ₀
A method for discriminating subjects. The object discrimination method according to claim 13 or 14,
In the electromagnetic wave transmitting step, a subject discrimination method for transmitting an electromagnetic wave including the specific frequency or frequency band. The method for discriminating a subject according to any one of claims 13 to 15,
In the analysis step, a subject discrimination method for determining the presence or absence of the subject by comparing the intensity of the specific electromagnetic wave with a predetermined threshold value. The method for discriminating a subject according to any one of claims 13 to 15,
In the analysis step, a subject discrimination method in which the distance to the subject is determined by comparing the intensity of the specific electromagnetic wave with a preset threshold value. The method for discriminating a subject according to any one of claims 13 to 15,
In the analysis step, a subject discrimination method for determining the content of a specific substance contained in the subject by comparing the intensity of the specific electromagnetic wave with a preset threshold value.

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