System, program, and others

Abstract

To provide a technique for notifying a user of the presence of a light-emitting device emitting light of a specific wavelength.SOLUTION: An electronic device 10 provided herein is configured to detect a speed measurement device 30 emitting pulsed light Lout of a specific wavelength. The electronic device 10 comprises: a reception unit configured to receive light of a selected wavelength out of incident light; and a control unit configured to provide control to notify the presence of the speed measurement device 30 based on a first received light intensity as measured when the reception unit selects the light of the specific wavelength to receive the light and a second received light intensity as measured when the reception unit selects light of a wavelength different from the specific wavelength to receive the light.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to systems, programs, and the like.

Background Art

[0002] There are various systems for measuring the speed of a vehicle traveling on a road. In the case of the radar method, a speed measuring device installed along the road emits microwaves in a predetermined frequency band toward the vehicle, receives the reflected wave from the vehicle, and measures the traveling speed of the vehicle.

[0003] For a user such as a vehicle driver, it may be useful to be able to grasp in advance the presence of a speed measuring device. Patent Documents 1 and 2 disclose an electronic device that receives microwaves emitted from a vehicle speed measuring device and outputs an alarm when it detects the presence of the vehicle speed measuring device.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The moving speed of an object can also be measured using light. In the case of this optical method, a light emitting device emits light toward the object, receives the reflected wave from the object, and measures the moving speed. Even when such an optical speed measuring device is installed, it is desirable to be able to notify the user of its presence. One object of the present invention is to provide a technique for notifying a user of the presence of a light emitting device that emits light of a specific wavelength.

[0006] The object of the invention of the present application is not limited to this, and the applicant also has the intention of obtaining rights through divisional applications, amendments, etc. for a configuration aimed at obtaining the effects exerted by the components of the configuration disclosed in this specification, drawings, etc. For example, in this specification, the problem of reading the part described as "can be" as "is a problem" is disclosed in this specification. The problems are described as independent of each other, and the applicant also has the intention of obtaining rights through divisional applications, amendments, etc. alone for the configurations for solving each problem. Even if the problem is implicitly grasped from the description of the specification, the applicant has the intention of making the scope of claims by amending or filing a divisional application for a part of the configuration described in this specification. In addition, the configuration for solving the problem of combining these independent problems is also disclosed, and the applicant has the intention of obtaining rights.

Means for Solving the Problem

[0007] (1) A system for detecting a light-emitting device that emits light of a specific wavelength, comprising: a light-receiving unit that receives light of a selected wavelength among the incident light; and a control unit that performs control to notify the presence of the light-emitting device based on a first light-receiving amount when the light-receiving unit selects and receives light of the specific wavelength and a second light-receiving amount when the light-receiving unit selects and receives light of a wavelength different from the specific wavelength.

[0008] The light-receiving unit may receive not only the light for the purpose of light reception but also light other than this light (hereinafter referred to as "disturbing light"). This disturbing light may be misrecognized as the light for the purpose of light reception. Therefore, simply selecting and receiving light of a specific wavelength may not be able to sufficiently eliminate the influence of the disturbing light. The light-emitting device emits light having energy concentrated in a specific wavelength, while the disturbing light often has energy distributed in a wider wavelength region than that. Therefore, by adopting the above system, it is possible to notify the user of the presence of the light-emitting device that emits light of a specific wavelength while reducing the notification of misrecognizing the disturbing light as the light from the light-emitting device compared to the case of simply selecting and receiving light of a specific wavelength.

[0009] The light-emitting device may be a device that emits light in which energy is distributed in a wavelength region narrower than at least ambient light. The specific wavelength may be the wavelength at which the energy of the light emitted by the light-emitting device peaks. The specific wavelength is preferably a wavelength that is not perceived by humans. For example, it is preferable to have energy at a specific wavelength outside the visible light region. The specific wavelength may belong to the infrared light region, for example, and may be 850 nm. The specific wavelength is not limited to this, and may be 950 nm, 1900 nm, or other wavelengths. The wavelength different from the specific wavelength may be a wavelength different from the wavelength at which the energy of the light emitted by the light-emitting device peaks. The wavelength different from the specific wavelength is preferably a wavelength included in the visible light region. The first light reception amount may indicate the amount of light of the specific wavelength selectively received by the light-receiving unit. Selecting a wavelength means selecting some wavelengths from within a certain wavelength region and not selecting at least some other wavelengths. The second light reception amount may indicate the amount of light of a wavelength different from the specific wavelength selectively received by the light-receiving unit. The first light reception amount is obtained using the first light-receiving element, and the second light reception amount is obtained using the second light-receiving element. However, it may be possible to obtain the first light reception amount and the second light reception amount using a single light-receiving element.

[0010] (2) The light-emitting device emits pulsed light of the specific wavelength, and the control unit may be a system that performs the control for the notification according to the number of pulses specified based on at least the first light reception amount.

[0011] The number of pulses received by the light-receiving unit may change depending on the positional relationship between the light-receiving unit and the light-emitting device. In this way, it is possible to notify the user according to the positional relationship between the light-receiving unit and the light-emitting device.

[0012] (3) The light-emitting device has the light-receiving unit provided in a vehicle, and the control unit may be a system that stops the control for the notification according to the number of pulses when there is another vehicle within a predetermined range from the vehicle. Stopping the control for the notification according to the number of pulses may mean not changing the content of the control related to the notification according to the number of pulses.

[0013] When there is another vehicle within a predetermined range from the position of the own vehicle, part or all of the light from the light-emitting device may be blocked by the other vehicle, and the number of light pulses received by the light-receiving unit may decrease. By doing so, it is possible to reduce false notifications caused by the presence of other vehicles.

[0014] (4) It is preferable that the light-emitting device emits pulsed light of the specific wavelength, and the control unit performs the control for the notification according to at least the pulse width or pulse interval specified based on the first light reception amount.

[0015] Referring to the width or interval of the received light pulses may be useful for detecting a light-emitting device that emits specific pulsed light. By doing so, it is possible to reduce false notifications that misidentify ambient light as the light from the light-emitting device.

[0016] (5) It is preferable that the control unit performs the control for the notification according to the magnitude of the first light reception amount.

[0017] The light reception amount of the specific wavelength at the light-receiving unit increases as it approaches the light-emitting device. By doing so, it is possible to reduce false notifications that misidentify ambient light as the light from the light-emitting device.

[0018] (6) It is preferable that the control unit performs the control for the notification when the position information of the current position satisfies predetermined conditions.

[0019] By doing so, it is possible to notify the presence of the light-emitting device specified based on the current position without receiving the light from the light-emitting device.

[0020] (7) It is preferable that the control unit performs the control for the notification when the current position is on a road of a predetermined type.

[0021] By doing so, it is possible to notify the presence of the light-emitting device without receiving the light from the light-emitting device on a road of a type where the light-emitting device may be present.

[0022] (8) The control unit may be a system that performs control to notify the presence of the light emitting device by a first method according to the first light reception amount and the second light reception amount, and to notify the presence of the light emitting device by a second method different from the first method according to the current position.

[0023] In this way, since the notification method is varied depending on whether the presence of the light emitting device is notified based on the light reception amount or based on the current position, it becomes easier for the user to grasp the event that caused the notification.

[0024] (9) A system may be provided with a radio wave receiving unit that receives a predetermined radio wave, and the control unit performs control to notify the presence of the light emitting device by a first method according to the first light reception amount and the second light reception amount, and to notify the presence of the radio wave generating device by a third method different from the first method in response to receiving the predetermined radio wave.

[0025] In this way, since the notification method is varied depending on whether the presence of the predetermined radio wave generating device is notified or the presence of the radio wave generating device is notified, it becomes easier for the user to grasp the event that caused the notification. The predetermined radio wave is preferably a microwave.

[0026] (10) The control unit may be a system that, after performing the control for the notification, performs control to notify whether imaging has been performed or not according to whether light determined in advance by the light receiving unit has been received.

[0027] In this way, when notifying the presence of the light emitting device, it is possible to further notify the user whether the user has been imaged.

[0028] (11) The light receiving unit may include a first wavelength selection unit that selectively transmits light of a specific wavelength among the incident light, a first light receiving element that receives the light transmitted by the first wavelength selection unit and outputs a first signal corresponding to the first light reception amount, a second wavelength selection unit that selectively transmits light of a wavelength different from the specific wavelength among the incident light, and a second light receiving element that receives the light transmitted by the second wavelength selection unit and outputs a second signal corresponding to the second light reception amount.

[0029] In this way, the presence of the light emitting device can be notified by a configuration using at least two sets of wavelength selection units and light receiving elements.

[0030] (12) The system may include a differential amplifier that amplifies the voltage difference between the first signal and the second signal.

[0031] In this way, based on the difference between the first light reception amount and the second light reception amount, the presence of the light emitting device can be accurately notified.

[0032] (13) The system may include a housing that houses the light receiving unit and has a first window corresponding to the first light receiving element and a second window corresponding to the second light receiving element.

[0033] In this way, the presence of the light emitting device can be notified by a configuration using at least two sets of light receiving elements housed in the housing.

[0034] (14) The system may include visible light cut filters provided on the first window and the second window to block visible light. Blocking visible light may be to at least attenuate visible light.

[0035] In this way, since filters for blocking visible light are provided on the first window and the second window, the wavelength selection unit and the light receiving elements housed in the housing are less likely to be visually recognized by the user.

[0036] (15) It is preferable that the first light receiving element and the second light receiving element be a system without lenses.

[0037] In this way, the light acceptance angle of the light receiving part can be increased as compared with the case where a lens is provided.

[0038] (16) It is preferable that the housing be a system having a partition wall that blocks light between the first light receiving element and the second light receiving element.

[0039] In this way, as compared with the case where no partition wall is provided between the first light receiving element and the second light receiving element, the possibility that the light transmitted through the first light receiving element is received by the second light receiving element, or the light transmitted through the second light receiving element is received by the first light receiving element is reduced.

[0040] (17) It is preferable that the light receiving part be a system shielded with a conductive material.

[0041] In this way, as compared with the case where the housing is not formed of a conductive material, the signal output from the light receiving element is less likely to be affected by electromagnetic noise.

[0042] (18) It is preferable that the system include a plurality of the light receiving parts.

[0043] In this way, the presence of the light emitting device can be notified using a plurality of light receiving parts.

[0044] (19) It is preferable that the plurality of light receiving parts include a first light receiving part whose specific wavelength is a first wavelength and a second light receiving part whose specific wavelength is a second wavelength different from the first wavelength.

[0045] In this way, even if there are a plurality of light emitting devices having different wavelengths of light emitted by the light emitting device or the wavelength of light emitted by the light emitting device is changed, the presence of the light emitting device can be notified.

[0046] A program is provided for causing a computer to realize the functions of the control unit of any of the above systems.

[0047] In this way, it is possible to reduce the notification that misidentifies the ambient light as the light from the light-emitting device.

[0048] The inventions described in the above (1) to (20) can be arbitrarily combined. For example, it is preferable to adopt a configuration in which at least a part of the configuration of at least one of the inventions after (2) is added to all or a part of the configuration of the invention described in (1). In particular, it is preferable to adopt an invention in which at least a part of the configuration of at least one of the inventions after (2) is added to the invention described in (1). Further, any configuration may be extracted from the inventions described in (1) to (20), and the extracted configurations may be combined. The applicant of the present application has the intention of obtaining rights for inventions including these configurations. Also, even if there is a description such as "in the case of ~" or "when ~", it is not described as a configuration limited to that case or that time. These show examples of better configurations, and the applicant also has the intention of obtaining rights for configurations other than these cases and times. Also, the order of the descriptions with an order is not limited to this order. The disclosure also includes configurations in which some parts are deleted or the order is changed, and the applicant has the intention of obtaining rights.

[0049] In the systems of (1) to (20), instead of the second light reception amount, it is preferable to perform control to notify the presence of the light-emitting device based on the third light reception amount when the light-receiving unit selectively receives light of a specific wavelength. In this case, each of the two or more light-receiving elements may receive light of the same specific wavelength. In this way, it is possible to notify the user of the presence of a light-emitting device that emits light of a specific wavelength.

[0050] A system may be provided that includes a light-receiving unit that receives incident light, and a control unit that performs control to notify the presence of a light-emitting device based on a pulse width or a pulse interval specified based on the amount of light received by the light-receiving unit. In this way, it is possible to notify the user of the presence of a light-emitting device that emits light of a specific wavelength.

Advantages of the Invention

[0051] According to the present invention, the user can be notified of the presence of a light-emitting device that emits light of a specific wavelength.

[0052] The effects of the invention of the present application are not limited to this, and the effects achieved by the components of the configuration disclosed in this specification, drawings, etc. are also disclosed, and the applicant also has the intention to obtain rights by means of divisional applications, amendments, etc. for the configurations that achieve such effects. For example, the parts described as "can be" in this specification are descriptions that clearly indicate the achieved effects, and even if there is no description of "can be", there are parts that indicate the effects. Also, even without such a description, there are effects grasped by the said configuration.

Brief Description of the Drawings

[0053]

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Embodiments for Carrying Out the Invention

[0054] Hereinafter, embodiments will be described in detail with reference to the drawings. The embodiments shown below are examples of the embodiments of the present disclosure, and the present disclosure is not limited to these embodiments. In the drawings referred to in the present embodiment, the same parts or parts having the same or similar functions are denoted by the same reference numerals or similar reference numerals (reference numerals with A, B, etc. attached after the numbers), and the repeated description thereof may be omitted. In addition, in each drawing referred to in the following description, the scale may be different from the actual one in order to make each member, each region, etc. recognizable. Hereinafter, a case where the system of the present disclosure is applied to a system mounted on a vehicle and detecting a speed measurement device that emits light of a specific wavelength will be described.

[0055] [1. First Embodiment] [1-1. Configuration of the First Embodiment] FIG. 1 is a diagram showing the configuration of a system according to the first embodiment. The electronic device 10 is an electronic device to which the system according to the present disclosure is applied. The electronic device 10 is a detector corresponding to the optical method and the radar method. The electronic device 10 targets the speed measurement device 30 for detection. The optical method is a method of detecting the light emitted by the speed measurement device 30. The light emitted by the speed measurement device 30 is pulsed light in the present embodiment. More specifically, the light emitted by the speed measurement device 30 is a pulsed laser having a certain pulse width. In this case, the optical method can also be called the laser method. The radar method is a method of receiving a predetermined radio wave emitted by a speed measurement device (not shown). The predetermined radio wave is a microwave in the present embodiment.

[0056] The electronic device 10 is a monitor-type device having a substantially rectangular parallelepiped shape. The electronic device 10 is installed in the passenger compartment of the vehicle 40. The electronic device 10 is installed on the dashboard 41, for example, using double-sided tape. The housing of the electronic device 10 is the housing 100. An opening is provided in the front surface of the housing 100. The electronic device 10 has a display unit 13 for displaying an image at the position of this opening. The housing 100 is formed of resin or other materials.

[0057] The speed measurement device 30 is installed at a speed enforcement point of the vehicle. The speed measurement device 30 may be, for example, either a fixed type or a mobile type, but a mobile type is preferable. The mobile type includes, for example, a portable type and a type mounted on a vehicle. In the case of the mobile type, even if the position information of the speed enforcement point is not known, the electronic device 10 can detect the speed measurement device 30 by an optical method. In the example of FIG. 1, the speed measurement device 30 is installed on the sidewalk adjacent to the lane and measures the speed of the vehicle traveling on this lane. The speed measurement device 30 measures the distance to a vehicle within a predetermined distance (for example, 70 m), and further measures the speed of the vehicle at a predetermined distance (for example, 20 m) closer to the self-device than that.

[0058] The speed measurement device 30 includes a speed measurement unit 31, an imaging unit 32, and a strobe 33. The speed measurement unit 31 measures the speed of the vehicle by a laser scanning method. Specifically, when the pulsed light Lout reaches the vehicle 40 and is reflected, the speed measurement unit 31 receives the reflected light Lref. The speed measurement unit 31 measures the distance to the vehicle 40 based on the time required from when the pulsed light Lout is emitted until the reflected light Lref is received. The speed measurement unit 31 repeatedly measures the distance to the vehicle 40 and measures the speed of the vehicle 40 based on the moving distance of the vehicle 40 per unit time.

[0059] The speed measurement unit 31 emits pulsed light Lout while changing its direction within a sector range T with a central angle of θ. θ is, for example, 110 degrees. The range T includes a wider range on the upstream side in the traveling direction of the vehicle 40 than the range on the downstream side, relative to the position where the speed measurement device 30 is installed. The speed measurement unit 31 changes the emission direction of the pulsed light Lout in the counterclockwise direction. For example, after emitting the pulsed light Lout in the direction of arrow D1, the speed measurement unit 31 emits the pulsed light Lout in the direction of arrow D2. The emission direction of the pulsed light Lout is, for example, approximately horizontal. The speed measurement unit 31 emits pulsed light onto a mirror that rotates at a constant speed, for example. The pulsed light reflected by the mirror and emitted from the light-emitting window is the pulsed light Lout.

[0060] The pulsed light Lout has energy concentrated at a specific wavelength. The specific wavelength may be the wavelength at which the energy of the light emitted by the light-emitting device peaks. Desirably, the pulsed light Lout has energy at a specific wavelength outside the visible light region, for example. The specific wavelength is preferably a wavelength that is not perceptible to humans, and for example, it should have energy at a specific wavelength outside the visible light region. The specific wavelength belongs to the infrared light region, for example, and is 850 nm. However, the specific wavelength is not limited to this and may be 950 nm, 1900 nm, or other wavelengths.

[0061] Figure 2 is a diagram showing an example of the waveform of the pulsed light Lout emitted from the speed measurement device 30. Here, the pulsed light Lout is a rectangular wave. However, the pulsed light Lout may be a sine wave, a triangular wave, a sawtooth wave, or other waveforms. The pulsed light Lout is light in which period T1 and period T2 appear alternately. Period T1 is the period during which pulsed light of a specific wavelength λout is emitted. During period T1, the pulsed light Lout alternates between a high level (H) and a low level (L). Period T2 is the period during which this pulsed waveform light is not emitted. As described above, the speed measurement device 30 emits pulsed light onto a mirror that rotates at a constant speed, and emits the pulsed light Lout reflected by this mirror. Therefore, period T2 is the period during which the pulsed light from the mirror is not directed toward the light-emitting window of the speed measurement device 30.

[0062] When the speed measured by the speed measurement unit 31 is equal to or higher than the threshold value, the imaging unit 32 images the target vehicle. The imaging unit 32 is used to image a vehicle that violates the speed limit. The strobe 33 emits light when imaged by the imaging unit 32. The imaging unit 32 may perform imaging based on light in the infrared light region so that imaging can be performed even at night. In this case, the strobe 33 may emit light having energy in the infrared light region. The speed measurement device 30 transmits data such as the measured speed and the captured image to an external computer.

[0063] FIG. 3 is a rear view of the electronic device 10. As shown in FIG. 3, a first window 101 and a second window 102 are formed on the back surface of the housing 100. The first window 101 and the second window 102 are openings for guiding external light into the housing 100. The first window 101 and the second window 102 are arranged at a predetermined interval in the left-right direction. The first window 101 and the second window 102 are, for example, rectangular, but may have other shapes. A light receiving unit 12 is provided inside the housing 100. The light receiving unit 12 receives light incident through the first window 101 and the second window 102.

[0064] FIGS. 4 and 5 are cross-sectional views of the electronic device 10. FIG. 4(a) is a cross-sectional view (sectional view taken along line I-I in FIG. 3) of the electronic device 10 cut along the vertical direction at a position including the first window 101. FIG. 4(b) is a cross-sectional view (sectional view taken along line II-II in FIG. 3) of the electronic device 10 cut along the vertical direction at a position including the second window 102. FIG. 5 is a cross-sectional view (sectional view taken along line III-III in FIG. 3) of the electronic device 10 cut along the left-right direction at a position including the first window 101 and the second window 102. FIG. 6 is a graph showing an example of the schematic characteristics of a wavelength selection unit, which will be described later, included in the light receiving unit 12. In FIG. 6, the horizontal axis corresponds to the wavelength, and the vertical axis corresponds to the transmittance.

[0065] As shown in FIGS. 4(a) and 4(b), a visible light cut filter 126 is provided on the first window 101. A visible light cut filter 127 is provided on the second window 102. The visible light cut filters 126 and 127 block at least a part of the visible light. The visible light cut filters 126 and 127 transmit light of a specific wavelength λout. Blocking the visible light may be regarded as at least attenuating the visible light. The visible light region is, for example, 400 to 700 nm. Due to the presence of the visible light cut filters 126 and 127, the components housed inside the housing 100 are less likely to be visually recognized from the outside. Also, due to the presence of the visible light cut filters 126 and 127, the adverse effects caused by the light receiving unit 12 receiving strong visible light such as direct sunlight can be reduced.

[0066] As shown in FIG. 4(a), a first wavelength selection unit 121 and a first light receiving element 122 are provided facing the first window 101. The first wavelength selection unit 121 selects and transmits light of a specific wavelength λout among the incident light. Selecting a wavelength may mean selecting some wavelengths from within a certain wavelength region and not selecting at least some other wavelengths. Here, the first wavelength selection unit 121 is a band-pass filter. As shown by the solid line in FIG. 6, it transmits light of wavelengths in the wavelength region including the specific wavelength λout, here, the wavelength region from wavelength λ1a to wavelength λ1b, and blocks light in other wavelength regions. Blocking light means at least attenuating the light, and the attenuation amount of the wavelengths blocking the light is larger than that of the wavelengths transmitting the light. The characteristics of the first wavelength selection unit 121 are determined from the viewpoint of transmitting only light of the same wavelength as the pulsed light from the speed measuring device 30 as much as possible. The width of the wavelength region from wavelength λ1a to wavelength λ1b is, for example, 20 nm, but it is more desirable that it be narrower than this.

[0067] In FIG. 6, the transmittance of the frequency region where light passes through is represented as 100%, and the frequency region where light is blocked is represented as approximately 0%. However, each may have a transmittance that is practically acceptable. The wavelength selection unit desirably exhibits sharp characteristics as exemplified in FIG. 6, but may also exhibit broader characteristics. For example, there may be wavelengths at which the transmittances of both the first wavelength selection unit 121 and the second wavelength selection unit 123 are not 0%.

[0068] The first light receiving element 122 receives the light transmitted by the first wavelength selection unit 121 and outputs a first signal corresponding to the first received light amount, which is the amount of received light. The first light receiving element 122 is desirably, for example, a photodiode, but may be a phototransistor or other light receiving element. The first light receiving element 122 has sensitivity at least in the infrared light region. The first light receiving element 122 includes, for example, a resin mold that transmits infrared light. The first light receiving element 122 preferably does not receive light in the wavelength region of 700 nm or less. The first light receiving element 122 is a so-called lensless type light receiving element that does not have a lens. Thereby, the light acceptance angle of the first light receiving element 122 becomes large (for example, 120 to 180 degrees), and light from multiple directions can be received. Alternatively, a combination of a lens and a mirror may be used to widen the light acceptance angle of the first light receiving element 122.

[0069] As shown in FIG. 4(b), a second wavelength selection unit 123 and a second light receiving element 124 are provided facing the second window 102. The second wavelength selection unit 123 is a filter that selects and transmits light in a wavelength region different from a specific wavelength λout among the incident light. The wavelength different from the specific wavelength is preferably a wavelength different from the wavelength at which the energy of the light emitted by the light emitting device peaks. The wavelength different from the specific wavelength is preferably a wavelength included in the visible light region. The second wavelength selection unit 123 is, for example, a band elimination filter. As shown by the dashed line in FIG. 6, the second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout, here, the wavelength region from wavelength λ2a to wavelength λ2b, and transmits light in other wavelength regions. The wavelength region from wavelength λ2a to wavelength λ2b does not include the specific wavelength λout, and desirably includes as wide a wavelength region other than the specific wavelength λout as possible. The characteristics of the second wavelength selection unit 123 are determined from the viewpoint of transmitting only light having a wavelength different from the pulsed light Lout from the velocity measurement device 30 as much as possible.

[0070] The second light receiving element 124 receives the light that has passed through the second wavelength selection unit 123 and outputs a second signal corresponding to the second received amount, which is the received amount thereof. The second light receiving element 124 is, for example, a photodiode, but may be a phototransistor or other light receiving element. The second light receiving element 124 preferably has the same characteristics as the first light receiving element 122, for example, the same product (for example, model number). This is because when the second light receiving element 124 and the first light receiving element 122 receive the same light, the first signal Sig1 and the second signal Sig2 become the same signal. Similar to the first light receiving element 122, the second light receiving element 124 is a so-called lensless type sensor without a lens provided.

[0071] As shown in FIG. 5, the housing 100 includes a partition wall 103 that blocks light between the first light receiving element 122 and the second light receiving element 124. The distance between the first light receiving element 122 and the second light receiving element 124 is desirably as small as possible. This is to prevent a shift in the light incident timing between the first light receiving element 122 and the second light receiving element 124. Even in this case, due to the presence of the partition wall 103, the possibility that the light transmitted through the first wavelength selection unit 121 is received by the second light receiving element 124 and the light transmitted through the second wavelength selection unit 123 is received by the first light receiving element 122 is reduced.

[0072] The light receiving unit 12 is preferably shielded using a conductive material. This shield is composed of, for example, a metallic case. Thereby, the influence of electromagnetic noise on the electronic components within the housing 100 is reduced.

[0073] The first window 101, the second window 102, and the light receiving unit 12 may be provided to face obliquely forward (e.g., the left front) with respect to the traveling direction of the vehicle 40 when the display unit 13 of the electronic device 10 faces the driver's seat of the vehicle 40. Thereby, the possibility that the light receiving unit 12 easily receives the pulsed light Lout from the speed measuring device 30 may increase.

[0074] FIG. 7 is a block diagram showing the electrical configuration of the electronic device 10. The control unit 11 controls each part of the electronic device 10. The control unit 11 is, for example, a computer including an arithmetic processing circuit and a memory. The arithmetic processing circuit includes, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or other arithmetic processing circuits. The memory includes, for example, a RAM (Random Access Memory) or other volatile memories. The arithmetic processing circuit performs various controls by temporarily reading data from the memory and performing arithmetic processing.

[0075] The light-receiving unit 12 includes a first wavelength selection unit 121, a first light-receiving element 122, a second wavelength selection unit 123, a second light-receiving element 124, and an interface 125. The first wavelength selection unit 121 selects, for example, a wavelength range from wavelength λ1a to wavelength λ1b among the incident light and transmits it as light Lin1. The first light-receiving element 122 receives the light Lin1 and outputs a first signal Sig1 corresponding to the first light-receiving amount. The first light-receiving amount may indicate the amount of light of a specific wavelength selected and received by the light-receiving unit 12. The first signal Sig1 indicates the light-receiving amount of the light Lin1. The second wavelength selection unit 123 selects a wavelength range different from the wavelength range from wavelength λ2a to wavelength λ2b and transmits it as light Lin2. The second light-receiving element 124 receives the light Lin2 and outputs a second signal Sig2 corresponding to the second light-receiving amount. The second light-receiving amount may indicate the amount of light of a wavelength different from the specific wavelength selected and received by the light-receiving unit 12. The second signal Sig2 indicates the light-receiving amount of the light Lin2. The interface 125 processes the first signal Sig1 and the second signal Sig2 and outputs the processed signals to the control unit 11. The interface 125 converts, for example, the first signal Sig1 and the second signal Sig2 into a digital format and outputs them.

[0076] The display unit 13 displays an image. The display unit 13 is, for example, a 3.2-inch color TFT liquid crystal display. However, the display unit 13 may be an organic EL display or a display device of other types. The speaker 14 outputs sound. The microwave receiving unit 15 includes an antenna and a receiving circuit and receives microwaves. The GPS (Global Positioning System) receiving unit 16 includes an antenna and a receiving circuit and receives signals from GPS satellites. The GPS receiving unit 16 processes the received signals and outputs position information. The position information includes, for example, latitude information and longitude information, and may further include altitude information. The communication unit 17 communicates with an external device. The communication unit 17 performs, for example, Wi-Fi (registered trademark), Bluetooth (registered trademark) or wireless communication of other types.

[0077] The storage unit 18 stores data. The storage unit 18 stores, for example, a program for the control unit 11 to perform various controls. The control unit 11 reads the program from the storage unit 18 into the memory and executes it. Further, the storage unit 18 stores map data indicating a map, data indicating the types and locations of various facilities, data for notifying the presence of a notification target, data for realizing a route guidance function, and the like. The notification target is, for example, a drowsy driving accident location, a speed measurement device (radar type, loop coil type, H system, LH system, photoelectric tube type, mobile type, etc.), a speed limit switching point, a regulated area, a checkpoint area, a parking prohibition monitoring area, an N system, a traffic monitoring system, an intersection monitoring point, a signal violation suppression system, a police station, an accident-prone area, an on-vehicle target-prone area, a sharp / continuous curve (highway), a branch / merge point (highway), an ETC lane advance notice (highway), a service area (highway), a parking area (highway), a highway oasis (highway), a smart interchange (highway), a gas station inside a PA / SA (highway), a tunnel (highway), a highway radio reception area (highway), a prefectural boundary notification, a roadside station, a viewpoint parking, etc. The storage unit 18 stores, in association with each other, the type information of these notification targets, the position information indicating their positions, the data of an image (for example, a schematic diagram or a photograph) to be displayed on the display unit 13, and the audio data.

[0078] Note that the storage unit 18 may include a storage medium that permanently stores data. The storage unit 18 may include, for example, an optical recording medium, a magnetic recording medium, a semiconductor recording medium, or other recording media.

[0079] The operation unit 19 receives the user's operations. The operation unit 19 includes, for example, a touch sensor, a volume adjustment button, and a work button. The touch sensor is provided on the surface of the display unit 13 and detects the position touched by the user. The volume operation button is operated to adjust the volume of the audio output from the speaker 14. The work button is a button for performing various operations.

[0080] The sensor unit 20 includes various sensors. The sensor unit 20 includes, for example, a geomagnetic sensor, an acceleration sensor, and an illuminance sensor. The geomagnetic sensor is a sensor that detects the geomagnetism and detects in which direction the north direction is with respect to the traveling direction. The acceleration sensor is a sensor that detects the acceleration of the vehicle in the front-rear, left-right, and up-down directions. The illuminance sensor is a sensor that detects the illuminance indicating the brightness inside the vehicle cabin.

[0081] The mounting part 21 is a mounting part on which an external storage medium is mounted. The external storage medium is, for example, a memory card. In this case, the mounting part 21 is a memory card slot. The data stored in the storage part 18 may be taken in via the external storage medium. As this data, there is update information of information (position information such as longitude and latitude, type information, etc.) of a new notification target.

[0082] The power supply unit 22 supplies the power supplied from the power source to each part in the electronic device 10. The power supply unit 22 includes, for example, a power switch and a DC jack. The DC jack is for connecting a cigarette plug cord, and is connected to the cigarette socket of the vehicle via the cigarette plug cord to receive power supply. The power switch is a switch for turning on or off the power of the electronic device 10.

[0083] The light emitting part 23 emits light in various colors. The light emitting part 23 includes, for example, light emitting diodes.

[0084] The cable terminal part 24 is a terminal to which an external connection cable is connected. For example, the connection cable is a cable for connecting the electronic device 10 to an OBD-II connector mounted on the vehicle. The OBD-II connector is also called a fault diagnosis connector, is connected to the ECU of the vehicle, and various vehicle information is output.

[0085] Note that the electronic device 10 may have functions provided in a well-known radar detector in addition to the above.

[0086] <1-2. Operation of the First Embodiment> Next, the operation of this embodiment will be described. <1-2-1. Notification by optical method> FIG. 8 is a flowchart showing the operation of the control unit 11 of the electronic device 10. FIG. 8 shows the operation when detecting the speed measuring device 30 by an optical method. When the electronic device 10 starts operating, the control unit 11 executes the processes described below. The timing of starting the operation of the electronic device 10 is not particularly limited, but for example, it may be triggered by the power of the electronic device 10 being turned on or the start of the execution of the route guidance function.

[0087] First, the control unit 11 starts displaying a map screen on the display unit 13 (step S1). The map screen is a screen showing the position of the own vehicle on the map. The map displayed on the display unit 13 is specified based on the map data and the position information from the GPS receiving unit 16. The position of the own vehicle is specified based on the position information from the GPS receiving unit 16. FIG. 9 is a diagram showing an example of the map screen. In the map screen shown in FIG. 9, an icon I1 indicating the position of the own vehicle is arranged on the map M. Note that on the map screen, the address of the current position, the distance to a predetermined notification target (here, "1960 m to the H system"), the speed limit, and a photo around the speed enforcement point are displayed. FIG. 10 is a diagram showing another example of the map screen. Also in the map screen shown in FIG. 10, an icon I1 indicating the position of the own vehicle is arranged on the map M. Hereinafter, an example of control when the map screen shown in FIG. 10 is being displayed will be described. Note that the icon in this embodiment may be replaced with characters, symbols, figures, or other objects.

[0088] Next, the control unit 11 acquires the first signal Sig1 and the second signal Sig2 from the light receiving unit 12 (step S2). Next, the control unit 11 calculates the difference between the first light reception amount corresponding to the first signal Sig1 and the second light reception amount corresponding to the second signal Sig2 (step S3). Next, the control unit 11 determines whether the calculated difference is equal to or greater than the threshold value (step S4). If the difference is less than the threshold value, the control unit 11 determines "NO" in step S4 and returns to the process of step S2. In this case, the control unit 11 assumes that the speed measuring device 30 has not been detected and does not notify that the speed measuring device 30 exists.

[0089] On the other hand, if the calculated difference is equal to or greater than the threshold value, the control unit 11 determines "YES" in step S4 and performs notification control (step S5). The notification control is control for notifying the presence of the speed measuring device 30. The notification control can be said to be control for issuing an alarm for the user to recognize what the speed measuring device does. Here, the notification control is control for notifying the user of the presence of the speed measuring device 30 by the first method. The notification control includes, for example, control for displaying a notification screen on the display unit 13.

[0090] FIG. 11 is a diagram showing an example of the notification screen. The notification screen shown in FIG. 11 is a screen in which a window W1 is superimposed on the above-described map screen. In the window W1, an icon M1 indicating the presence of the speed measuring device 30 and a message indicating the presence of the speed measuring device 30, "You are approaching a speed enforcement area. Please be careful.", are arranged. The icon M1 is an icon that allows the user to recognize that the speed measuring device 30 corresponds to the optical method. The notification control may include control for outputting a notification voice from the speaker 14. In this case, the control unit 11 may output a voice "You are approaching a speed enforcement area by laser. Please be careful." from the speaker 14. The notification control may include other controls, for example, control for causing the light emitting unit 23 to emit light. The notification control may be any control that notifies the user of the presence of the speed measuring device 30 in a recognizable manner.

[0091] Next, the control unit 11 determines whether to end the process of FIG. 8 (step S6). The timing for ending the process is not particularly limited, but for example, it may be triggered by the power of the electronic device 10 being turned off by an operation of the operation unit 19, or by the route guidance function being stopped. If it is determined "NO" in step S6, the control unit 11 returns to the process of step S2 and repeats the above process (step S4). For example, when the difference changes from being equal to or greater than the threshold value to being less than the threshold value, the control unit 11 determines "NO" in step S4 and stops the notification control. In this case, the control unit 11 causes the map screen shown in FIG. 12 to be displayed on the display unit 13. This is because it means that the speed enforcement point has been passed. If it is determined "YES" in step S6, the control unit 11 ends the process of FIG. 8 (step S7).

[0092] Here, the reason why the speed measurement device 30 can be detected by the method described above will be explained. As described with reference to FIG. 6, the first wavelength selection unit 121 selects and transmits light of a specific wavelength λout (more specifically, a wavelength range from wavelength λ1a to wavelength λ1b) having energy in the pulse light Lout. For this reason, the first signal Sig1 should indicate a large light reception amount during the period when the pulse light Lout is being received, and a small light reception amount during other periods. However, the light receiving unit 12 may receive not only the target pulse light Lout but also disturbing light. This disturbing light may be misrecognized as the pulse light. As the disturbing light, for example, there is light that periodically arrives after being blocked by the branches and leaves of trees shaken by the wind in sunlight. Another type of disturbing light includes light that repeatedly turns on and off periodically from traffic signals, advertisements, etc., and the light of a rotating warning light that rotates at a constant speed. Also, due to the vibration of the light receiving unit, the light received by the light receiving unit changes. For example, when the vehicle 40 travels in a place where periodic vibrations occur, such as on a trestle, the orientation of the light receiving unit 12 (for example, the first light receiving element 122) changes accordingly, and light such as sunlight may be received as light that repeatedly turns on and off at a predetermined period. In such a case as well, the first signal Sig1 indicates a relatively large light reception amount.

[0093] In contrast, the second wavelength selection unit 123 blocks light of a specific wavelength λout (in this embodiment, the wavelength range from wavelength λ2a to wavelength λ2b) having energy of the pulsed light Lout, and transmits light in other wavelength ranges. For this reason, the amount of light received by the second signal Sig2 is small during the period when the pulsed light Lout is received. The second light receiving element 124 receives the above-described disturbance light, but such disturbance light generally has a wide wavelength range in which energy is distributed. Therefore, even when the light receiving unit 12 receives disturbance light that is periodically turned on and off, it is considered that the amount of light received by the second light receiving element 124 increases. For this reason, when the amount of light received by the first signal Sig1 is large and the amount of light received by the second signal Sig2 is small, that is, when the difference in the amount of light received is equal to or greater than the threshold value, it can be estimated that the pulsed light Lout has been received. On the other hand, when the amount of light received by the first signal Sig1 is large and the amount of light received by the second signal Sig2 is also large, that is, when the difference in the amount of light received is less than the threshold value, it can be estimated that the possibility of the pulsed light Lout being received is low. Therefore, according to the electronic device 10, by receiving light using the first light receiving element 122 and the second light receiving element 124, an improvement in the detection accuracy of the speed measuring device 30 can be expected.

[0094] <1-2-2. Notification by radar method> The control unit 11 may further execute the process of FIG. 13 in parallel with the process of FIG. 8 based on the microwave received by the microwave receiving unit 15.

[0095] First, the control unit 11 acquires a reception signal of the microwave from the microwave receiving unit 15 (step S11). Next, the control unit 11 performs a determination process of determining the presence or absence of a radar method speed measuring device based on the reception signal of the microwave (step S12). In step S12, the control unit 11 may determine whether or not a speed enforcement point exists based on the frequency band of the received microwave. The algorithm for this determination may be, for example, the method described in Patent Document 1 or 2, and the description thereof is omitted.

[0096] Next, based on the result of the determination process, the control unit 11 determines whether the speed measurement device has been detected (step S13). If it is determined as "YES" in step S13, the control unit 11 performs notification control (step S14). Here, the notification control is control for notifying the user of the presence of the speed measurement device by a third method. The notification control includes, for example, control for displaying a notification screen on the display unit 13. FIG. 14 is a diagram showing an example of the notification screen. The notification screen shown in FIG. 14 is a screen in which a window W2 is superimposed on the above-described map screen. In the window W2, an icon M2 indicating the presence of the speed measurement device 30 and a message indicating the presence of the speed measurement device, "You are approaching a speed enforcement area. Please be careful.", are arranged. The icon M2 is an icon that allows the user to recognize that the speed enforcement device corresponds to the radar method. That is, the icon M2 is different from the icon M1. Note that the notification control may include control for outputting a notification voice from the speaker 14. In this case, the control unit 11 may output a voice "You are approaching a speed enforcement area by radar. Please be careful." from the speaker 14. The notification control may be other controls, for example, may include control for causing the light emitting unit 23 to emit light. Also here, the notification control may be any control that notifies the user of the presence of the speed measurement device in a recognizable manner.

[0097] <1-3. Modification of the First Embodiment> The control unit 11 may further perform the following control. <1-3-1. Notification According to the Number of Pulses> When the speed measurement device 30 emits pulsed light, referring to the number of pulses is also useful for detecting the speed measurement device 30. FIG. 15 is a diagram showing an example of the waveform of the pulsed light Lout received by the electronic device 10. FIG. 15(a) shows the case where the distance between the electronic device 10 and the speed measurement device 30 is relatively large, and FIG. 15(b) shows the case where the distance between the electronic device 10 and the speed measurement device 30 is relatively small. As shown in FIG. 15(a), when the distance between the speed measurement device 30 and the electronic device 10 is relatively large, the pulsed light Lout traveling in the direction of the electronic device 10 can be received, but the pulsed light traveling in the direction that propagates only through the position close to the speed measurement device 30 on the road (for example, directly beside the speed measurement device 30) is not received. Therefore, the light reception period Rx1 of the pulsed light Lout becomes relatively shorter than the non-light reception period Rx2. As shown in FIG. 15(b), when the distance between the speed measurement device 30 and the electronic device 10 is relatively small, the pulsed light Lout traveling in the direction of the electronic device 10 can be received, and the pulsed light traveling in the direction that propagates only through the position close to the speed measurement device 30 on the road can also be received. Therefore, the light reception period Rx1 of the pulsed light Lout becomes relatively longer than the non-light reception period Rx2. Also, it is considered that the number of pulses decreases immediately after the vehicle 40 passes the position of the speed measurement device 30.

[0098] Therefore, the control unit 11 may perform notification control according to the number of pulses. For example, the control unit 11 may change the notification level according to the number of pulses included in the reception period of the pulsed light. The notification level is an index indicating how important the content of the notification is to the user, and in this embodiment, it may be paraphrased as the alarm level. The control unit 11 specifies the number of pulses based on at least the amount of light received by the first light receiving element 122. For example, when the number of pulses is equal to or greater than the threshold value, or when the number of pulses is increasing, the control unit 11 increases the notification level because it is approaching the speed measuring device 30. When the number of pulses is less than the threshold value, or when the number of pulse widths is decreasing, the control unit 11 decreases the notification level because it is far from or moving away from the speed measuring device 30. The control unit 11 varies the notification method according to the notification level. For example, the control unit 11 may change the message displayed on the display unit 13, change the notification sound output from the speaker 14, or change the emission color of the light emitting unit 23 according to the notification level.

[0099] Further, the control unit 11 may estimate the distance from the number of pulse widths and perform notification according to the distance. For example, as shown in FIG. 16, the control unit 11 may estimate the position of the speed measuring device 30 from the number of pulse widths and display it on a map. In this example, the icon P indicates the position of the speed measuring device 30. As described above, the control unit 11 can notify the user according to the positional relationship between the light receiving unit 12 and the speed measuring device 30.

[0100] Incidentally, as shown in FIG. 17, when there is another vehicle in front of the vehicle 40, all or part of the pulsed light Lout may be blocked by the vehicle C traveling ahead. In this case, it may not be possible to accurately identify the positional relationship even by referring to the number of pulses. Therefore, the control unit 11 detects the presence or absence of another vehicle C within a predetermined range in front of the vehicle 40. When there is no other vehicle C, the control unit 11 may perform notification control according to the number of pulses, and when the vehicle C is present, the notification control may be stopped. Stopping the control of notifying according to the number of pulses means that the content of the control related to the notification is not changed according to the number of pulses. Further, the electronic device 10 may stop the notification control according to the number of pulses when the inter-vehicle distance is less than the threshold value, and may perform this notification control when the inter-vehicle distance is greater than or equal to the threshold value. The method of detecting the vehicle C is not particularly limited, but there is a method using the in-vehicle camera 50. The in-vehicle camera 50 is, for example, a camera used for a drive recorder, and here it images the front of the vehicle 40.

[0101] FIG. 18 is a flowchart showing the operation of the control unit 11 of the electronic device 10 in this case. The control unit 11 acquires a captured image from the in-vehicle camera 50 via the communication unit 17 (step S21). Next, the control unit 11 analyzes the captured image (step S22). The algorithm for analyzing the captured image is not limited, but for example, there is a pattern matching method. Then, the control unit 11 determines whether there is a vehicle ahead (step S23). If it is determined "NO" in step S23, the control unit 11 determines to perform notification control according to the number of pulses (step S24). In this case, the control unit 11 performs processes such as rewriting a flag to a value indicating that control according to the number of pulses is to be performed. If it is determined "YES" in step S23, the control unit 11 determines to stop the notification control according to the number of pulses (step S25). In this case, the control unit 11 performs processes such as rewriting a predetermined flag to a value indicating that control according to the number of pulses is not to be performed. Here, a vehicle ahead of the vehicle 40 has been detected, but it may also be behind the vehicle 40 or the like. Note that the electronic device 10 may incorporate the in-vehicle camera 50. As described above, the possibility of misrecognizing the positional relationship between the light receiving unit 12 and the speed measuring device 30 due to the presence of another vehicle C is reduced.

[0102] <1-3-2. Control according to Pulse Width or Pulse Interval> When the speed measurement device 30 emits pulsed light, referring to the pulse width or the pulse interval is also useful for detecting the speed measurement device 30. The speed measurement device 30 emits pulsed light of a specific wavelength at a predetermined duty ratio. Also, from the viewpoint of safety, the duty ratio of the pulsed light is set to be equal to or less than a predetermined value. Therefore, the control unit 11 may determine whether the speed measurement device 30 exists based on a predetermined pulse width or pulse interval and the pulse width or pulse interval of the received light. For example, when the control unit 11 is included within a certain range from the reference pulse width or pulse interval, it determines that the speed measurement device 30 exists, but determines that it does not exist otherwise. The control unit 11 specifies the pulse width or the pulse interval based on at least the amount of light received by the first light receiving element 122. As described above, the control unit 11 can reduce the notification of misidentifying ambient light as the light from the light emitting device.

[0103] <1-3-3. Control according to the intensity of pulsed light> Referring to the intensity of the pulsed light of the received light is also useful for detecting the light emitting device. The intensity of the pulsed light increases as the vehicle 40 approaches the speed measurement device 30 and decreases as it moves away. Therefore, the control unit 11 may change the notification level according to the amount of pulsed light received by the first light receiving element 122. For example, when the intensity of the pulsed light is increasing, the control unit 11 may increase the notification level, and when it is decreasing, lower the notification level to notify. Also, when the amount of pulsed light received is equal to or less than a threshold value, the control unit 11 may determine that the speed measurement device 30 does not exist. As described above, the control unit 11 can notify the user according to the positional relationship between the light receiving unit 12 and the speed measurement device 30.

[0104] <1-3-4. Notification of the presence or absence of imaging> After performing the notification control, the control unit 11 may perform control to notify whether imaging has been performed or not according to whether predetermined light has been detected or not. When imaging by the imaging unit 32 is performed, the strobe 33 emits light. Therefore, after performing the notification control, when the control unit 11 further detects the light of the strobe 33, it may be good to notify that imaging has been performed. Or, when the control unit 11 does not detect the light of the strobe 33 after performing the notification control, it may be good to notify that imaging has not been performed. Thereby, the user can grasp whether the vehicle 40 has been imaged or not. Note that the light reception from the strobe 33 may be performed using the light reception unit 12 or another light reception unit may be used.

[0105] [2. Second Embodiment] In this embodiment, the electronic device 10 has a function of notifying the presence of the speed measuring device 30 even when it does not receive pulsed light and microwaves. The electronic device of this embodiment may or may not have some or all of the functions of the first embodiment described above.

[0106] [2-1. Configuration of the Second Embodiment] FIG. 19 is a diagram for explaining the outline of the system of this embodiment. As shown in FIG. 19, there are various types of roads. For example, on the road Ar1 which is also used for a school route called a green belt, it is particularly important to observe the speed limit of the vehicle 40, and it is considered that the possibility of installing the speed measuring device 30 is higher than that of other types of roads Ar2. Therefore, when the electronic device 10 is located on a road of a predetermined type, the control unit 11 may notify the presence of the speed measuring device 30.

[0107] [2-2. Operation of the Second Embodiment] FIG. 20 is a flowchart showing the operation of the control unit 11 of the electronic device 10. The control unit 11 acquires position information from the GPS receiver 16 (step S31). Next, the control unit 11 determines whether the current position indicated by the position information is within a predetermined area (step S32). Here, the control unit 11 determines whether the vehicle 40 is on the green belt based on the current position and the data stored in the storage unit 18. When the control unit 11 determines "YES" in step S32, it performs notification control (step S33). The notification control includes, for example, control to display a notification screen on the display unit 13.

[0108] FIG. 21 is a diagram showing an example of the notification screen. The notification screen shown in FIG. 21 is a screen in which a window W3 is superimposed on the above-described map screen. In the window W3, an icon M3 indicating the presence of the speed measuring device 30 and a message indicating the presence of the speed measuring device, "You are in the speed limit enforcement area.", are arranged. The icon M3 is an icon that allows the user to recognize that the speed limit enforcement location is based on the position information. That is, for example, the icon M3 is different from the icons M1 and M2. Note that the notification control may include control to output a notification sound from the speaker 14. In this case, the control unit 11 may output a voice "You are in the speed limit enforcement area." from the speaker 14. The notification control may include other controls, for example, control to cause the light emitting unit 23 to emit light. Note that the predetermined area is not limited to the green belt and may be a one-way road or other types of roads.

[0109] In this way, since the presence of the light emitting device can be notified based on the position information, the presence can be notified without receiving the pulsed light from the speed measuring device 30.

[0110] [3. Third Embodiment] In this embodiment, the electronic device 10 has a plurality of light receiving units that receive pulsed light.

[0111] FIG. 22 is a block diagram showing the electrical configuration of the electronic device 10. In this example, the electronic device 10 includes three light receiving units 12A, 12B, and 12C. Each configuration of the light receiving units 12A, 12B, and 12C may be the same as that of the light receiving unit 12 except for the characteristics of the wavelength selection unit. Note that in FIG. 22, the illustration of the display unit 13 to the cable terminal unit 24 described in FIG. 6 is omitted.

[0112] FIG. 23 is a diagram showing the characteristics of the first wavelength selection unit 121 and the second wavelength selection unit 123 of the light receiving units 12A, 12B, and 12C of this embodiment. FIG. 23(a) corresponds to the light receiving unit 12A, FIG. 23(b) corresponds to the light receiving unit 12B, and FIG. 23(c) corresponds to the light receiving unit 12C. As shown in FIGS. 23(a) to 23(c), the wavelengths of the pulsed light to be received are different for each of the light receiving units 12A, 12B, and 12C. As shown by the solid line in FIG. 23(a), the first wavelength selection unit 121 of the light receiving unit 12A transmits light in a wavelength region including a specific wavelength λout1, here the wavelength region from wavelength λ11a to wavelength λ11b, and blocks light in a different wavelength region. As shown by the dashed line in FIG. 23(a), the second wavelength selection unit 123 blocks light in a wavelength region including a specific wavelength λout1, here the wavelength region from wavelength λ21a to wavelength λ21b, and transmits light in a different wavelength region. As shown by the solid line in FIG. 23(b), the first wavelength selection unit 121 of the light receiving unit 12B transmits light in a wavelength region including a specific wavelength λout2, here the wavelength region from wavelength λ12a to wavelength λ12b, and blocks light in a different wavelength region. As shown by the dashed line in FIG. 23(b), the second wavelength selection unit 123 blocks light in a wavelength region including a specific wavelength λout2, here the wavelength region from wavelength λ22a to wavelength λ22b, and transmits light in a different wavelength region. As shown by the solid line in FIG. 23(c), the first wavelength selection unit 121 of the light receiving unit 12C transmits light in a wavelength region including a specific wavelength λout3, here the wavelength region from wavelength λ13a to wavelength λ13b, and blocks light in a different wavelength region. As shown by the dashed line in FIG. 23(c), the second wavelength selection unit 123 blocks light in a wavelength region including a specific wavelength λout3, here the wavelength region from wavelength λ23a to wavelength λ23b, and transmits light in a different wavelength region. λout1, out2, and out3 are, for example, 850 nm, 950 nm, and 1900 nm, but are not limited thereto.

[0113] When the control unit 11 detects the speed measurement device 30 based on the first signal Sig1 and the second signal Sig2 from any of the light receiving units 12A, 12B, and 12C, it notifies that the speed measurement device 30 exists. According to this embodiment, even when there are multiple speed measurement devices 30 with different wavelengths of light emitted by the electronic device 10 or when the wavelength of the light emitted by the speed measurement device 30 is changed, the existence of the speed measurement device 30 can be notified.

[0114] The characteristics of the plurality of light receiving units 12 may be made the same. In this case, as shown in FIG. 24, the light receiving units 12A, 12B, and 12C may be provided at different positions of the vehicle 40. Here, the light receiving unit 12A is provided at the left front part, the light receiving unit 12B is provided at the center front part, and the light receiving unit 12C is provided at the right front part. Thereby, based on the light reception timing of the laser in the light receiving units 12A, 12B, and 12C, the arrival direction of the laser can also be estimated. For example, if it arrives from the left front, the light reception timing of the light receiving unit 12A becomes relatively early, and if it arrives from the right front, the light reception timing of the light receiving unit 12C becomes relatively early. Further, the control unit 11 may notify the user of the direction in which the pulsed light has arrived.

[0115] Also, the speed measurement unit 31 emits pulsed light to a mirror that rotates at a constant speed and emits the pulsed light Lout reflected by this mirror. Therefore, in each of the light receiving units 12A, 12B, and 12C, a difference corresponding to, for example, the rotation speed of the mirror, the positions of the light receiving units 12A, 12B, and 12C, and the distance between the light receiving units 12A, 12B, and 12C and the speed measurement device 30 appears in the light reception timing of the pulsed light Lout. Therefore, the control unit 11 may detect the speed measurement device 30 based on the light reception timing of the pulsed light Lout in the light receiving units 12A, 12B, and 12C.

[0116] The directions of the light received by the light receiving units 12A, 12B, and 12C may be different from each other. For example, the directions of the light receiving elements may be made different by 20 degrees among the light receiving units 12A, 12B, and 12C. Thereby, there is a possibility that a decrease in detection accuracy due to the installation position of the speed measurement device 30 can be suppressed. In this embodiment, the number of light receiving units may be two or four or more.

[0117] [Configuration of Light-Receiving Unit 12] Next, a configuration example of the light-receiving unit 12 applicable to each of the above-described embodiments will be described. FIG. 25 is a diagram showing a circuit configuration example of the light-receiving unit 12. The first light-receiving element 122 is a photodiode PD1 here. Light passing through the first wavelength selection unit 121 is incident on the light-receiving surface of the photodiode PD1. The cathode of PD1 is connected to the power supply line on the high potential side, and the anode is connected to one end of the resistor R1. The other end of the resistor R1 is grounded. The input terminal of the inverter INV1 is commonly connected to the anode of the photodiode PD1 and one end of the resistor R1. The output terminal of the inverter INV1 is connected to the negative input terminal of the differential amplifier AMP. The second light-receiving element 124 is a photodiode PD2 here. Light passing through the second wavelength selection unit 123 is incident on the light-receiving surface of the photodiode PD2. The cathode of the photodiode PD2 is connected to the power supply line on the high potential side, and the anode is connected to one end of the resistor R2. The other end of the resistor R2 is grounded. The input terminal of the inverter INV2 is commonly connected to the anode of the photodiode PD2 and one end of the resistor R2. The output terminal of the inverter INV2 is connected to the positive input terminal of the differential amplifier AMP. Thereby, a signal corresponding to the difference in the light reception amounts of the photodiodes PD1 and PD2 is output from the output terminal of the differential amplifier AMP. The control unit 11 detects the speed measurement device 30 based on this difference. The control unit 11 may detect the speed measurement device 30 based on the signal after being amplified by the differential amplifier AMP.

[0118] [5. External Configuration of Electronic Device 10] FIG. 26 is a six-sided view showing an example of the external configuration of the electronic device 10. In this example, on the front surface of the housing of the electronic device 10, a display unit 13, a light-emitting unit 23, and an illuminance sensor 201 of the sensor unit 20 are provided. A speaker 14 is provided so as to output sound from the upper end surface of the housing 100. On the right end surface of the housing 100, a mounting portion 21 (that is, an SD card slot) for mounting an SD card (registered trademark) is provided. On the upper right portion of the back surface of the housing 100, a light-receiving unit 12 is provided. Further, on the lower left portion of the back surface of the housing 100, a power switch 221 and a DC jack 222 of the power supply unit 22 are provided. The area 104 is an area where the model name and the serial number are written.

[0119] [6. Modification Example] The present disclosure is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist.

[0120] (Modification Example 1) The first wavelength selection unit 121 and the second wavelength selection unit 123 do not necessarily have to be band - pass filters respectively. The first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured, for example, by a combination of a low - pass filter and a high - pass filter. Also, as shown by the characteristics in Fig. 27(a), the second wavelength selection unit 123 may be a low - pass filter. In this example, the second wavelength selection unit 123 transmits light in a wavelength region on the low - frequency side of the wavelength λ2a and blocks light in a wavelength region on the high - frequency side thereof. The second wavelength selection unit 123 may be a high - pass filter as shown by the characteristics in Fig. 27(b). In this example, the second wavelength selection unit 123 transmits light in a wavelength region on the high - frequency side of the wavelength λ2b and blocks light in a wavelength region on the low - frequency side thereof. Even in this case, during the period when the pulsed light Lout is received, the received amount of the second signal Sig2 is extremely small. The light receiving unit 12 receives not only the pulsed light Lout for the purpose of light reception but also external disturbance light. Generally, such external disturbance light has a wide wavelength region in which energy is distributed. Therefore, even when the light receiving unit 12 receives external disturbance light whose lighting and extinguishing are repeated periodically, it is considered that the received amount becomes large. For this reason, when the received amount of the first signal Sig1 is large and the received amount of the second signal Sig2 is small, that is, when the difference is equal to or greater than the threshold value, it can be estimated that the pulsed light Lout has been received. On the other hand, when the received amount of the first signal Sig1 is large and the received amount of the second signal Sig2 is also large, that is, when the difference is less than the threshold value, it can be estimated that the possibility of the pulsed light Lout being received is low. Therefore, according to the electronic device 10, by receiving light using the first light receiving element 122 and the second light receiving element 124, an improvement in the detection accuracy of the speed measurement device 30 can be expected. Also, the first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured using optical elements other than filters, such as prisms.

[0121] (Modification Example 2) In the above-described embodiment, the light receiving unit 12 had two light receiving elements, i.e., the first light receiving element 122 and the second light receiving element 124, but it may also be configured to have only one. FIG. 28 is a diagram showing the configuration of the electronic device 10 in this modified example. In this example, the light receiving unit 12 does not have the first light receiving element 122 and the second light receiving element 124, but has a light receiving element 128. The light receiving element 128 may have the same configuration as the first light receiving element 122 or the second light receiving element 124. Further, the electronic device 10 of this modified example has a driving unit 60. The driving unit 60 moves the first wavelength selection unit 121 and the second wavelength selection unit 123 in accordance with the control of the control unit 11. The driving unit 60 has, for example, a motor and a gear. During the operation of the electronic device 10, the control unit 11 moves the first wavelength selection unit 121 and the second wavelength selection unit 123 so as to alternately cover the light receiving surface of the light receiving element 128. That is, as shown in FIG. 29(a), the control unit 11 first provides the first wavelength selection unit 121 on the light receiving surface of the light receiving element 128. Then, the control unit 11 acquires the signal obtained from the light receiving element 128 at this time as the first signal Sig1. Next, as shown in FIG. 29(b), the control unit 11 first separates the first wavelength selection unit 121 from the light receiving surface of the light receiving element 128 and provides the second wavelength selection unit 123 on the light receiving surface. Then, the control unit 11 acquires the signal obtained from the light receiving element 128 at this time as the second signal Sig2. Then, the control unit 11 detects the speed measurement device 30 based on the first signal Sig1 and the second signal Sig2.

[0122] (Modified Example 3) In the above-described embodiment, the light receiving unit 12 had two light receiving elements, i.e., the first light receiving element 122 and the second light receiving element 124, but it may have three or more light receiving elements. Even in this case, the control unit 11 can expect to improve the detection accuracy of the speed measurement device 30 by making the wavelength regions of the light to be selected different for each of the three or more light receiving elements.

[0123] (Modified Example 4) In the above description, the light receiving unit 12 had at least one set of a wavelength selection unit and a light receiving element. Instead of this, the light receiving unit 12 may have a configuration having at least one light receiving element without a wavelength selection unit. For example, the light receiving unit 12 may receive a third light reception amount when receiving light of a specific wavelength, instead of a second light reception amount which is the light reception amount of light having a wavelength different from the specific wavelength. In this case, the control unit 11 may perform control to notify the presence of the speed measurement device 30 based on the second light reception amount and the third light reception amount.

[0124] Also, the light receiving unit 12 may receive light incident by a single light receiving element. Then, the control unit 11 may perform control to notify the presence of the speed measurement device 30 based on the pulse width or pulse interval specified based on the light reception amount of the light received by the light receiving unit 12. The method using the pulse width or pulse interval may be the same as the modification example of the first embodiment described above.

[0125] (Modification Example 5) The light receiving element may be an imaging element included in a camera such as a drive recorder. For example, the control unit 11 acquires an imaging image of the in-vehicle camera 50 and performs image analysis. It is desirable that the in-vehicle camera is a camera without an infrared cut filter. This is to prevent the pulsed light Lout from being blocked. Then, when the control unit 11 receives light of a specific pattern as a result of image analysis, it performs control to notify the presence of the speed measurement device 30. The control unit 11 may detect the light of the specific pattern based on the change in brightness indicating that it is light of a specific wavelength. When the light of the specific pattern is received, the control unit 11 may record the imaging image for a period corresponding to the light reception period. The period is, for example, a period of one minute before and after the timing when the light of the specific pattern is received, but is not limited to this.

[0126] (Modification Example 6) The electronic device 10 may detect the speed measurement device 30 behind the vehicle 40. In this case, the light receiving unit 12 may be arranged so as to be able to receive the pulsed light from the vehicle 40.

[0127] (Modification Example 7) When the electronic device 10 detects the speed measuring device 30, it may upload information such as position information indicating the position of the speed measuring device 30 to the server. The server may be a server that provides a social networking service, or may be a server that manages and distributes update information regarding the notification target object.

[0128] In addition, the system according to the present disclosure is applicable to detecting a light emitting device that emits light of a specific wavelength, in addition to detecting the speed measuring device.

[0129] (Modification Example 8) Part of the configurations and operations described in the above-described embodiments may be omitted or changed. For example, the electronic device 10 may be a device that supports the optical method and does not support the radar method. Further, for example, the positions, shapes, and sizes of the respective members in the electronic device 10 are merely examples. Further, the light receiving unit 12 may be provided outside the electronic device 10. For example, the light receiving unit 12 may be provided at a predetermined position in the vehicle 40 such as the position of the number plate. In this case, the control unit 11 may acquire a signal from the light receiving unit 12 via the communication unit 17.

[0130] (Modification Example 9) In addition, the control unit 11 may determine whether the speed measuring device 30 exists, and when it is determined that at least the speed measuring device 30 exists, output a signal indicating the determination result to an external device. This external device may notify that the speed measuring device 30 exists. Further, the present invention can also be specified by a control device (for example, a control module) incorporated in the electronic device 10 and having the same function as the control unit 11.

[0131] The scope of the present invention is not limited to the configurations explicitly described in the specification, but also includes combinations of various aspects of the present invention disclosed herein. Among the present invention, the configuration for which a patent is sought is specified in the appended claims. However, even if a configuration is not currently specified in the claims, the configurations disclosed herein are intended to be the subject of future claims.

[0132] The present invention is not limited to the configurations described in the above-described embodiments. The components of the above-described embodiments and variations may be arbitrarily selected and combined. Also, any component of each embodiment or variation may be arbitrarily combined with any component described in the means for solving the invention or a component embodying any component described in the means for solving the invention. The applicant also intends to obtain rights in the present application through amendment or divisional application, etc. Even if there are descriptions such as "in the case of ~" or "when ~", the descriptions are not limited to such cases or times. The present invention also discloses configurations that are not such cases or times and intends to obtain rights. Also, the descriptions with an order are not limited to this order. The present invention also discloses configurations in which some parts are deleted or the order is changed and intends to obtain rights.

[0133] Also, through a change application for a design application, the applicant intends to obtain rights for the overall design or partial design. Although the drawings depict the entire device in solid lines, the drawings include not only the overall design but also partial designs claimed for a part of the device. For example, not only can a part of the members of the device be a partial design, but the drawings also include a partial design of a part of the device regardless of the members. As a part of the device, it may be a part of the members of the device or a part of the members. Regarding the overall design, of course, the applicant also intends to claim the rights for a partial design in which an arbitrary part of the solid-line part of the drawings is changed to a dashed line.

Explanation of Reference Numerals

[0134] 10: Electronic device 11: Control unit 12: Light receiving unit 12A: Light receiving unit 12B: Light receiving unit 12C: Light receiving unit 13: Display unit 14: Speaker 15: Microwave receiving unit 16: GPS receiving unit 17: Communication unit 18: Memory unit 19: Operation unit 20: Sensor unit 21: Mounting unit 22: Power supply unit 23: Light emitting unit 24: Cable terminal unit 30: Speed measurement device 31: Speed measurement unit 32: Imaging unit 33: Flash 40: Vehicle 41: Dashboard 50: In-vehicle camera 60: Driving unit 100: Housing 101: First window 102: Second window 103: Partition 104: Region 121: First wavelength selection unit 122: First light receiving element 123: Second wavelength selection unit 124: Second light receiving element 125: Interface 126: Visible light cut filter 127: Visible light cut filter 128: Light receiving element 201: Illuminance sensor 221: Power switch 222: DC jack

Claims

1. A system for detecting a light-emitting device that emits light of a specific wavelength, comprising: a light-receiving unit that receives light of a selected wavelength among the incident light; a control unit that performs control to notify the presence of the light-emitting device based on a first light-receiving amount when the light-receiving unit receives light of the specific wavelength by selection and a second light-receiving amount when the light-receiving unit receives light of a wavelength different from the specific wavelength by selection.

2. The light-emitting device emits light of a pulse waveform of the specific wavelength, and the control unit performs the control for notification according to the number of pulses specified based on at least the first light-receiving amount. The system according to claim 1.

3. The light-receiving unit is provided in a vehicle, and when there is another vehicle within a predetermined range from the vehicle, the control unit stops the control for notification according to the number of pulses. The system according to claim 2.

4. The light-emitting device emits pulsed light of the specific wavelength, and the control unit performs the control for notification according to a pulse width or a pulse interval specified based on at least the first light-receiving amount. The system according to any one of claims 1 to 3.

5. The control unit performs the control for notification according to the magnitude of the first light-receiving amount. The system according to any one of claims 1 to 4.

6. When the position information of the current position satisfies a predetermined condition, the control unit performs the control for notification. The system according to any one of claims 1 to 5.

7. When the current position is on a road of a predetermined type, the control unit performs the control for notification. The system according to claim 6.

8. The control unit performs the control for notification so as to notify the presence of the light-emitting device by a first method according to the first light-receiving amount and the second light-receiving amount, and to notify the presence of the light-emitting device by a second method different from the first method according to the current position. The system according to claim 6 or claim 7.

9. Comprising a radio wave receiving unit that receives a predetermined radio wave, and the control unit performs the control for notification so as to notify the presence of the light-emitting device by a first method according to the first light-receiving amount and the second light-receiving amount, and to notify the presence of the radio wave generating device by a third method different from the first method according to receiving the predetermined radio wave. The system according to any one of claims 1 to 8.

10. After performing the control for the notification, the control unit performs control to notify whether imaging has been performed or not according to whether light determined in advance is received by the light receiving unit. The system according to any one of claims 1 to 9.

11. The light receiving unit includes: a first wavelength selection unit that selects and transmits light of a specific wavelength among the incident light; a first light receiving element that receives the light transmitted by the first wavelength selection unit and outputs a first signal corresponding to the first light reception amount; a second wavelength selection unit that selects and transmits light of a wavelength different from the specific wavelength among the incident light; a second light receiving element that receives the light transmitted by the second wavelength selection unit and outputs a second signal corresponding to the second light reception amount; The system according to any one of claims 1 to 10, comprising:

12. Comprising a differential amplifier that amplifies the voltage difference between the first signal and the second signal The system according to claim 11.

13. Comprising a housing that houses the light receiving unit and has a first window corresponding to the first light receiving element and a second window corresponding to the second light receiving element The system according to claim 11 or claim 12.

14. A visible light cut filter provided on the first window and the second window to block visible light The system according to any one of claims 11 to 13, comprising:

15. The first light receiving element and the second light receiving element do not have lenses The system according to any one of claims 11 to 14.

16. The housing has a partition wall that blocks light between the first light receiving element and the second light receiving element The system according to any one of claims 12 to 15.

17. The light receiving unit is shielded with a conductive material The system according to any one of claims 1 to 16.

18. Comprising a plurality of the light receiving units The system according to any one of claims 1 to 17.

19. The plurality of light receiving units include a first light receiving unit in which the specific wavelength is a first wavelength, and a second light receiving unit in which the specific wavelength is a second wavelength different from the first wavelength The system according to claim 18.

20. A program for causing a computer to realize the functions of the control unit of the system according to any one of claims 1 to 19.

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