JP2020112555A - System, program, and others - Google Patents

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

The present invention relates to systems and programs.

There are various types of systems for measuring the speed of a vehicle traveling on a road. In the case of the radar system, a speed measuring device installed along a road emits a microwave of a predetermined frequency band toward a vehicle, receives a reflected wave from the vehicle, and measures the traveling speed of the vehicle.

It may be useful for a user such as a driver of a vehicle to be able to grasp the existence of the speed measurement device in advance. Patent Documents 1 and 2 disclose an electronic device that receives a microwave emitted from a vehicle speed measuring device and outputs an alarm when it detects that the vehicle speed measuring device is present.

JP, 2008-64588, A JP, 2017-96728, A

Light can also be used to measure the moving speed of an object. In this optical system, the light emitting device emits light toward an object, receives a 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 inform the user of its existence. One of the objects of the present invention is to provide a technique for informing a user of the existence of a light emitting device that emits light of a specific wavelength.

The object of the invention of the present application is not limited to this, and the intention is to acquire a right through a divisional application, amendment, etc. for a configuration intended to obtain the effect obtained from the configuration disclosed in the present specification and drawings. .. For example, a problem in which a place where "is possible" is read as "is a problem" in the present specification is disclosed in the present specification. The issues are described as independent ones, and we have the intention to acquire the right by the divisional application, amendment, etc. independently regarding the configuration for solving each issue. Even if the problem is implicitly understood from the description in the specification, the applicant has the intention to make a part of the configuration described in the specification in the amendment or the divisional application to claim. It also discloses a structure that solves the problems that combine these independent problems, and has the intention to acquire the right.

(1) A system for detecting a light emitting device that emits light of a specific wavelength, wherein a light receiving unit that receives light of a selected wavelength of incident light and the light receiving unit selects and receives the specific wavelength. And a second light receiving amount when the light receiving unit selects and receives light having a wavelength different from the specific wavelength, and a control unit that performs control for notifying the presence of the light emitting device. And a system comprising:

The light receiving unit may receive not only the light to be received, but also light other than this light (hereinafter referred to as “disturbance light”). This ambient light may be mistaken as the intended light for receiving light. Therefore, the influence of ambient light may not be sufficiently eliminated by simply selecting and receiving light of a specific wavelength. The light emitting device emits light having energy concentrated in a specific wavelength, but the ambient light often has energy distributed in a wider wavelength region than that. Therefore, according to the system described above, while reducing the notification that the ambient light is erroneously recognized as the light from the light emitting device as compared with the case of simply selecting and receiving the light of the specific wavelength, the light emitting device that emits the light of the specific wavelength is reduced. The presence can be notified to the user.

The light emitting device is preferably a device that emits light having energy distributed in a wavelength region narrower than at least ambient light. The specific wavelength may be a wavelength at which the energy of light emitted from the light emitting device reaches a peak. The specific wavelength may be a wavelength that is not perceived by humans, and may have energy at a specific wavelength outside the visible light region, for example. The specific wavelength belongs 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 another wavelength. The wavelength different from the specific wavelength may be different from the wavelength at which the energy of light emitted from the light emitting device reaches a peak. The wavelength different from the specific wavelength may be a wavelength included in the visible light region. The first amount of received light may indicate the amount of light of a specific wavelength that the light receiving unit has selected and received. Selecting a wavelength means selecting some wavelengths from a certain wavelength range and not selecting at least some other wavelengths. The second amount of received light may indicate the amount of light having a wavelength different from the specific wavelength received by the light receiving unit. Although the first light receiving element is used to obtain the first light receiving amount and the second light receiving element is used to obtain the second light receiving amount, there are cases where a single light receiving element is used to obtain the first light receiving amount and the second light receiving amount. May be.

(2) The light emitting device may emit a pulsed light of the specific wavelength, and the control unit may perform the notification control in accordance with at least the number of pulses specified based on the first received light amount. ..

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. With this configuration, the user can be notified according to the positional relationship between the light receiving unit and the light emitting device.

(3) In the light emitting device, the light receiving unit is provided in a vehicle, and the control unit stops the notification control according to the number of pulses when another vehicle exists within a predetermined range from the vehicle. It is recommended that the system Stopping the notification control according to the number of pulses may be such that the content of the control related to the notification is not changed according to the number of pulses.

When another vehicle exists within a predetermined range from the position of the vehicle, some 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. is there. By doing so, it is possible to reduce the number of false alarms caused by the presence of other vehicles.

(4) The light emitting device emits pulsed light of the specific wavelength, and the controller controls the notification according to at least a pulse width or a pulse interval specified based on the first received light amount. Good to do.

Reference to the pulse width or pulse interval of the received light may be useful in detecting a light emitting device that emits a specific pulsed light. By doing so, it is possible to reduce the notification that the ambient light is erroneously recognized as the light from the light emitting device.

(5) The control unit may be a system that performs the notification control according to the magnitude of the first received light amount.

The light receiving amount of the specific wavelength in the light receiving unit becomes larger as it gets closer to the light emitting device. By doing so, it is possible to reduce the notification that the ambient light is erroneously recognized as the light from the light emitting device.

(6) The control unit may be a system that performs the notification control when the position information of the current position satisfies a predetermined condition.

With this configuration, the presence of the light emitting device specified based on the current position can be notified without receiving light from the light emitting device.

(7) The control unit may be a system that performs the notification control when the current position is on a road of a predetermined type.

With this configuration, the presence of the light emitting device can be notified even on the road of the type in which the light emitting device may exist, without receiving light from the light emitting device.

(8) The control unit notifies the presence of the light emitting device by a first method according to the first received light amount and the second received light amount, and different from the first method according to the current position. It is advisable to use a system for performing the notification control so as to notify the presence of the light emitting device by the method 2).

In this way, the notification method differs depending on whether the presence of the light emitting device is notified based on the amount of received light or based on the current position, so that the user can grasp the event that caused the notification. It will be easier.

(9) A radio wave reception unit that receives a predetermined radio wave is provided, and the control unit notifies 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 the predetermined light reception unit. According to the reception of the radio wave, the third method different from the first method may be used to notify the presence of the radio wave generation device.

In this way, the notification method differs depending on whether the presence of a predetermined radio wave generator is notified or the presence of a radio wave generator is notified, so that the user can grasp the event that caused the notification. Easier to do. The predetermined radio wave may be a microwave.

(10) The control unit, after performing the notification control, notifies the image pickup or non-image pickup according to whether or not a predetermined light is received by the light receiving unit. It is recommended that the system be

With this configuration, when the presence of the light emitting device is notified, it is possible to further notify the user whether or not the user has captured an image.

(11) The light receiving unit receives the first wavelength selection unit that selects and transmits light of a specific wavelength among the incident light and the light transmitted by the first wavelength selection unit, and outputs the first light. A first light receiving element that outputs a first signal according to the amount of received light; a second wavelength selection unit that selects light having a wavelength different from the specific wavelength among the incident light and transmits the light; and the second wavelength It is preferable that the system includes a second light receiving element that receives the light transmitted by the selection unit and outputs a second signal according to the second received light amount.

With this configuration, the presence of the light emitting device can be notified by the configuration using at least two sets of the wavelength selection unit and the light receiving element.

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

With this configuration, the presence of the light emitting device can be accurately notified based on the difference between the first received light amount and the second received light amount.

(13) It is preferable that the system includes a housing that accommodates 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.

With this configuration, the presence of the light emitting device can be notified by the configuration using at least two sets of light receiving elements housed in the housing.

(14) The system may include a visible light cut filter that is provided in the first window and the second window and blocks visible light. Blocking visible light may be at least attenuating visible light.

With this configuration, since the filters that block visible light are provided in the first window and the second window, it becomes difficult for the user to visually recognize the wavelength selection unit and the light receiving element housed in the housing.

(15) The first light receiving element and the second light receiving element may be a system having no lens.

With this configuration, the light receiving angle of the light receiving portion can be increased as compared with the case where the lens is provided.

(16) It is preferable that the housing has a partition wall that blocks light between the first light receiving element and the second light receiving element.

With this configuration, the light transmitted through the first light receiving element is received by the second light receiving element or the second light receiving element as compared with the case where the partition wall is not provided between the first light receiving element and the second light receiving element. It is less likely that the light passing through the element will be received by the first light receiving element.

(17) The light receiving unit may be a system shielded by a material having conductivity.

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

(18) It is preferable that the system includes a plurality of the light receiving units.

With this configuration, the presence of the light emitting device can be notified using the plurality of light receiving units.

(19) A system in which a plurality of the light receiving units includes 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. Good to do.

With this configuration, the presence of the light emitting device can be notified even when there are a plurality of light emitting devices having different wavelengths of the light emitted by the light emitting device or the wavelength of the light emitted by the light emitting device is changed.

(20) A program for causing a computer to realize the function of the control unit of any of the above systems is provided.

By doing so, it is possible to reduce the notification that the ambient light is erroneously recognized as the light from the light emitting device.

The inventions described in (1) to (20) above can be arbitrarily combined. For example, it is preferable to add at least a part of the configuration of at least one invention after (2) to the configuration of all or part of the invention shown in (1). In particular, the invention shown in (1) is preferably an invention obtained by adding at least a part of the configuration of at least one invention after (2). Further, arbitrary configurations may be extracted from the inventions shown in (1) to (20) and the extracted configurations may be combined. The applicant of the present application intends to obtain the right to the invention including these structures. Further, even if there is a description of “in the case of” and “when it is”, it is not described as a configuration limited to that case or at that time. These are examples of better configurations, and we have the intention to obtain rights in these and other occasional configurations as well. Also, the place where the description is accompanied by the order is not limited to this order. It also discloses the configuration in which some parts are deleted or the order is changed, and it has the intention to acquire the right.

In the systems (1) to (20), the presence of the light emitting device is notified based on a third light receiving amount when the light receiving unit selects a specific wavelength and receives light, instead of the second light receiving amount. It is good to control. In this case, each of the two or more light receiving elements may receive the light of the same specific wavelength. By doing so, it is possible to notify the user of the existence of the light emitting device that emits light of a specific wavelength.

A light receiving unit that receives the incident light, and a control unit that performs control to notify the presence of the 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. A system may be provided. By doing so, it is possible to notify the user of the existence of the light emitting device that emits light of a specific wavelength.

According to the present invention, it is possible to notify the user of the existence of a light emitting device that emits light of a specific wavelength.

The effect of the invention of the present application is not limited to this, and the effect obtained from the portion of the configuration disclosed in the present specification and the drawings is also disclosed, and the configuration having the effect is also acquired through divisional application/amendment and the like. Have the intention to For example, in the present specification, a portion described as “-capable” is a description that clearly indicates the effect to be exerted, and there is a portion that exhibits the effect even if the “-capable” is not described. Even if there is no such description, there is an effect that can be grasped by the configuration.

It is a figure which shows the structure of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the waveform of the pulsed light which the speed measuring device which concerns on 1st Embodiment emits. FIG. 3 is a rear view of the electronic device according to the first embodiment. It is sectional drawing of the electronic device which concerns on 1st Embodiment. It is sectional drawing of the electronic device which concerns on 1st Embodiment. It is a figure explaining an example of the outline characteristic of the 1st wavelength selection part and the 2nd wavelength selection part concerning a 1st embodiment. It is a block diagram which shows the electric constitution of the electronic device which concerns on 1st Embodiment. 6 is a flowchart showing an operation of the electronic device according to the first embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 1st Embodiment. 6 is a flowchart showing an operation of the electronic device according to the first embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 1st Embodiment. It is a figure which shows an example of the waveform of the pulsed light which the electronic device which concerns on the modification of 1st Embodiment receives. It is a figure which shows an example of the display screen of the electronic device which concerns on the modification of 1st Embodiment. It is a figure explaining the reason that the number of pulses of the pulsed light which the electronic device which concerns on the modification of 1st Embodiment receives is reduced. 8 is a flowchart showing an operation of the electronic device according to the modified example of the first embodiment. It is a figure explaining the outline of the system which concerns on 2nd Embodiment. 7 is a flowchart showing an operation of the electronic device according to the second embodiment. It is a figure which shows an example of the display screen of the electronic device which concerns on 2nd Embodiment. It is a block diagram which shows the structure of the system which concerns on 3rd Embodiment. It is a figure explaining an example of the outline characteristic of the 1st wavelength selection part and the 2nd wavelength selection part concerning a 3rd embodiment. It is a block diagram which shows an example of arrangement|positioning of the light-receiving part in the system which concerns on 3rd Embodiment. It is a figure which shows the circuit structural example of the light-receiving part which concerns on a modification. It is a hexahedral view which shows an example of an external appearance structure of an electronic device. It is a figure explaining an example of the characteristic of the 1st wavelength selection part and the 2nd wavelength selection part concerning one modification. It is a figure which shows the structure of the light-receiving part which concerns on a modification. It is a figure showing control which a control part concerning one modification performs.

Hereinafter, embodiments will be described in detail with reference to the drawings. The embodiments described below are examples of the embodiments of the present disclosure, and the present disclosure is not limited to these embodiments. Note that in the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals or similar reference numerals (reference numerals having only A or B after the number), and the repetition thereof. May be omitted. Further, in each drawing referred to in the following description, the scale may be different from the actual scale in order to make each member, each region, and the like recognizable. Hereinafter, the case where the system of the present disclosure is applied to a vehicle-mounted system that detects a speed measurement device that emits light of a specific wavelength will be described.

[1. First Embodiment]
<1-1. Configuration of First Embodiment>
FIG. 1 is a diagram showing a 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 compatible with an optical system and a radar system. The electronic device 10 targets the speed measuring device 30. The optical method is a method of detecting the light emitted by the speed measuring device 30. The light emitted by the speed measuring device 30 is pulsed light in the present embodiment. More specifically, the light emitted by the speed measuring device 30 is a pulse laser having a constant pulse width. In this case, the optical system can also be called a laser system. The radar method is a method of receiving a predetermined radio wave emitted by a speed measuring device (not shown). The predetermined radio wave is a microwave in this embodiment.

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

The speed measuring device 30 is installed at a speed control point of the vehicle. The speed measuring device 30 may be, for example, a fixed type or a movable type, but is preferably a movable type. The mobile type includes, for example, a portable type and a type mounted on a vehicle. In the case of the mobile type, the electronic device 10 can detect the speed measuring device 30 by an optical method even if the position information of the speed control point is not known. In the example of FIG. 1, the speed measuring device 30 is installed on a sidewalk adjacent to a road and measures the speed of a vehicle traveling on this road. The speed measurement device 30 measures the distance to the 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 than the own device.

The speed measuring device 30 includes a speed measuring unit 31, an imaging unit 32, and a strobe 33. The speed measuring unit 31 measures the speed of the vehicle by the laser scanning method. Specifically, when the pulsed light Lout reaches and is reflected by the vehicle 40, the speed measurement unit 31 receives the reflected light Lref. The speed measuring unit 31 measures the distance to the vehicle 40 based on the time taken from emitting the pulsed light Lout to receiving the reflected light Lref. The speed measuring unit 31 measures the distance to the vehicle 40. The measurement is repeated, and the speed of the vehicle 40 is measured based on the moving distance of the vehicle 40 per unit time.

The velocity measuring unit 31 emits the pulsed light Lout while changing the direction within a fan-shaped range T having a central angle of the angle θ. θ is, for example, 110 degrees. The range T includes a range on the upstream side in the traveling direction of the vehicle 40 wider than the range on the downstream side of the position where the speed measuring device 30 is installed. The speed measurement unit 31 changes the emission direction of the pulsed light Lout in the counterclockwise direction. The speed measurement unit 31 emits the pulsed light Lout in the arrow D1 direction and then emits the pulsed light Lout in the arrow D2 direction, for example. The emission direction of the pulsed light Lout is, for example, a substantially horizontal direction. The speed measurement unit 31 emits pulsed light to a mirror that rotates at a constant speed, for example. The pulsed light that is reflected by the mirror and emitted from the light emitting window is the pulsed light Lout.

The pulsed light Lout has energy concentrated on a specific wavelength. The specific wavelength may be a wavelength at which the energy of light emitted from the light emitting device reaches a peak. The pulsed light Lout preferably has energy at a specific wavelength outside the visible light region, for example. The specific wavelength may be a wavelength that is not perceived by humans, and may have energy at a specific wavelength outside the visible light region, for example. 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 another wavelength.

FIG. 2 is a diagram showing an example of the waveform of the pulsed light Lout emitted from the speed measuring device 30. The pulsed light Lout is a rectangular wave here. However, the pulsed light Lout may be a sine wave, a triangular wave, a sawtooth wave, or another waveform. The pulsed light Lout is light in which the periods T1 and T2 appear alternately. The period T1 is a period during which pulsed light of the specific wavelength λout is emitted. In the period T1, the pulsed light Lout alternately changes between a high level (H) and a low level (L). The period T2 is a period during which the light having the pulse waveform is not emitted. As described above, the speed measuring device 30 emits the pulsed light to the mirror that rotates at a constant speed, and emits the pulsed light Lout reflected by the mirror. Therefore, the period in which the pulsed light from the mirror does not face the light emitting window of the speed measuring device 30 is the period T2.

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

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 to the inside of 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 the light incident through the first window 101 and the second window 102.

4 and 5 are cross-sectional views of the electronic device 10. FIG. 4A is a cross-sectional view (I-I cross-sectional view of FIG. 3) when the electronic device 10 is cut along the vertical direction at a position including the first window 101. FIG. 4B is a cross-sectional view (II-II cross-sectional view of FIG. 3) when the electronic device 10 is cut along the vertical direction at the position including the second window 102. FIG. 5 is a cross-sectional view (III-III cross-sectional view of FIG. 3) when the electronic device 10 is 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 schematic characteristics of a wavelength selection unit described later that the light receiving unit 12 has. In FIG. 6, the horizontal axis corresponds to wavelength and the vertical axis corresponds to transmittance.

As shown in FIGS. 4A and 4B, the first window 101 is provided with a visible light cut filter 126. A visible light cut filter 127 is provided in the second window 102. The visible light cut filters 126 and 127 block at least a part of visible light. The visible light cut filters 126 and 127 allow light having a specific wavelength λout to pass therethrough. Blocking visible light may be at least attenuating visible light. The visible light region is 400 to 700 nm, for example. The presence of the visible light cut filters 126 and 127 makes it difficult for the components housed inside the housing 100 to be visually recognized from the outside. Further, the presence of the visible light cut filters 126 and 127 can reduce the adverse effects of the light receiving unit 12 receiving strong visible light such as direct sunlight.

As shown in FIG. 4A, 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 light having a specific wavelength λout from the incident light and transmits it. The selection of the wavelength may mean that some wavelengths are selected from a certain wavelength range and at least some other wavelengths are not selected. The first wavelength selection unit 121 is a band pass filter here. As indicated by the solid line in FIG. 6, light having a wavelength range including the specific wavelength λout, here, wavelengths in the wavelength range from wavelength λ1a to wavelength λ1b is transmitted, and light in other wavelength regions is blocked. Blocking light means at least attenuating the light, and the wavelength blocking the light has a larger attenuation amount than the wavelength transmitting the light. The characteristics of the first wavelength selection unit 121 are determined from the viewpoint that light having the same wavelength as the pulsed light from the speed measurement device 30 is transmitted as much as possible. The width of the wavelength region from the wavelength λ1a to the wavelength λ1b is, for example, 20 nm, but it is more preferable that the width is narrower than this.

Note that, in FIG. 6, the transmittance in the frequency region where light is transmitted is shown as 100% and the frequency region where light is blocked is shown as approximately 0%, but it is sufficient if the transmittance can be practically used. The wavelength selection unit preferably exhibits steep characteristics as illustrated in FIG. 6, but may exhibit broader characteristics. For example, there may be wavelengths where the transmittances of the first wavelength selection unit 121 and the second wavelength selection unit 123 are not 0%.

The first light receiving element 122 receives the light transmitted by the first wavelength selection unit 121 and outputs a first signal according to the first received light amount, which is the received light amount. The first light receiving element 122 is preferably a photodiode, for example, but may be a phototransistor or another 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. It is preferable that the first light receiving element 122 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 having no lens. As a result, the light receiving angle of the first light receiving element 122 becomes large (for example, 120 to 180 degrees), and it becomes possible to receive light in multiple directions. Instead of this, a lens or a mirror may be combined to widen the light receiving angle of the first light receiving element 122.

As shown in FIG. 4B, 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, of the incident light, light in a wavelength region different from the specific wavelength λout and transmits the light. The wavelength different from the specific wavelength may be different from the wavelength at which the energy of light emitted from the light emitting device reaches a peak. The wavelength different from the specific wavelength may be a wavelength included in the visible light region. The second wavelength selection unit 123 is, for example, a band elimination filter. As shown by a broken line in FIG. 6, the second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout, here, a wavelength region from the wavelength λ2a to the wavelength λ2b, and blocks light in other wavelength regions. Through. It is desirable that the wavelength region from the wavelength λ2a to the wavelength λ2b does not include the specific wavelength λout, and preferably includes a wide wavelength region other than the specific wavelength λout. The characteristics of the second wavelength selection unit 123 are determined from the viewpoint that only the light having a wavelength different from the pulsed light Lout from the speed measuring device 30 is transmitted as much as possible.

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 light amount, which is the received light amount. The second light receiving element 124 is, for example, a photodiode, but may be a phototransistor or another light receiving element. The second light receiving element 124 is preferably the same light receiving element having 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. Like the first light receiving element 122, the second light receiving element 124 is a so-called lensless sensor in which no lens is provided.

As shown in FIG. 5, the housing 100 includes a partition 103 that blocks light between the first light receiving element 122 and the second light receiving element 124. It is desirable that the distance between the first light receiving element 122 and the second light receiving element 124 is as small as possible. This is because the first light receiving element 122 and the second light receiving element 124 do not cause deviation in the light incident timing. Even in this case, due to the presence of the partition wall 103, 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 detected by the first light receiving element 122. The possibility of being received by is reduced.

The light receiving part 12 is preferably shielded by using a material having conductivity. This shield is made of, for example, a metallic case. This reduces the influence of electromagnetic noise on the electronic components inside the housing 100.

The first window 101, the second window 102, and the light receiving unit 12 are obliquely forward (for example, left front) with respect to the traveling direction of the vehicle 40 when the display unit 13 of the electronic device 10 is directed toward the driver's seat of the vehicle 40. May be provided so as to face. As a result, the light receiving unit 12 may easily receive the pulsed light Lout from the speed measuring device 30.

FIG. 7 is a block diagram showing an electrical configuration of the electronic device 10. The control unit 11 controls each unit 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 another arithmetic processing circuit. The memory includes, for example, a RAM (Random Access Memory) or other volatile memory. The arithmetic processing circuit performs various controls by temporarily reading data into the memory and performing arithmetic processing.

The light receiving section 12 includes a first wavelength selecting section 121, a first light receiving element 122, a second wavelength selecting section 123, a second light receiving element 124, and an interface 125. The first wavelength selection unit 121 selects, for example, a wavelength region from the wavelength λ1a to the wavelength λ1b of the incident light and transmits the light as Lin1. The first light receiving element 122 receives the light Lin1 and outputs the first signal Sig1 according to the first received light amount. The first light receiving amount may indicate the light amount of the specific wavelength that the light receiving unit 12 has selected and received. The first signal Sig1 indicates the amount of received light Lin1. The second wavelength selection unit 123 selects a wavelength region different from the wavelength region from the wavelength λ2a to the wavelength λ2b, and transmits it as the light Lin2. The second light receiving element 124 receives the light Lin2 and outputs the second signal Sig2 corresponding to the second received light amount. The second received light amount may indicate the amount of light having a wavelength different from the specific wavelength selected and received by the light receiving unit 12. The second signal Sig2 indicates the amount of received light Lin2. The interface 125 processes the first signal Sig1 and the second signal Sig2, and outputs the processed signal 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 the digital format.

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 another type of display device. The speaker 14 outputs sound. The microwave receiver 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 a signal from a GPS satellite. The GPS receiver 16 processes the received signal 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 wireless communication of, for example, Wi-Fi (registered trademark), Bluetooth (registered trademark), or another method.

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 the program. The storage unit 18 also stores map data indicating a map, data indicating the types of various facilities and their locations, data for notifying the presence of the notification target, data for realizing the route guidance function, and the like. The object to be notified is, for example, a dozing driving accident point, a speed measuring device (radar method, loop coil type, H system, LH system, phototube type, mobile type, etc.), speed limit switching point, enforcement area, inspection area, banning. Monitoring area, N system, traffic monitoring system, intersection monitoring point, signal ignoring deterrent system, police station, accident-prone area, on-vehicle frequently-occurring area, sharp/continuous curve (highway), branch/merging point (highway), ETC lane advance guidance (highway), service area (highway), parking area (highway), highway oasis (highway), smart interchange (highway), PA/SA gas station (highway), tunnel ( Highway), highway radio reception area (highway), prefectural border announcement, roadside station, view point parking, etc. The storage unit 18 stores the type information of these notification objects, the position information indicating the position thereof, the data of the image (for example, a schematic diagram or photograph) displayed on the display unit 13, and the audio data in association with each other. To do.

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 another recording medium.

The operation unit 19 receives a user operation. The operation unit 19 includes, for example, a touch sensor, a volume control 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 sound output from the speaker 14. The work button is a button for performing various works.

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 geomagnetism to detect which direction the north direction is relative to the traveling direction. The acceleration sensor is a sensor that detects the longitudinal, lateral, and vertical accelerations of the vehicle. The illuminance sensor is a sensor that detects illuminance indicating the brightness in the vehicle interior.

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

The power supply unit 22 supplies the power supplied from the power supply to each unit 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 cigar plug cord, and is connected to a cigar socket of a vehicle via the cigar plug cord to receive power supply. The power switch is a switch for turning on or off the power of the electronic device 10.

The light emitting unit 23 emits light of various colors. The light emitting unit 23 includes, for example, a light emitting diode.

The cable terminal portion 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 the OBD-II connector mounted on the vehicle. The OBD-II connector is also called a failure diagnosis connector, is connected to the vehicle ECU, and outputs various types of vehicle information.

In addition to the above, the electronic device 10 may have a function included in a known radar detector.

<1-2. Operation of 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 an operation when the speed measuring device 30 is detected by the optical method. The control part 11 will perform the process demonstrated below, when the electronic device 10 starts operation|movement. The trigger of the operation of the electronic device 10 is not particularly limited, but may be triggered by, for example, the power of the electronic device 10 being turned on or the execution of the route guidance function being started.

The control unit 11 first starts displaying the map screen on the display unit 13 (step S1). The map screen is a screen showing the vehicle position 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 own vehicle position 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. On the map screen shown in FIG. 9, an icon I1 indicating the position of the vehicle is arranged on the map M. The map screen displays an address of the current position, a distance to a predetermined notification object (here, “1960 m to the H system”), a speed limit, and photographs around the speed control point. FIG. 10 is a diagram showing another example of the map screen. Also on the map screen shown in FIG. 10, an icon I1 indicating the position of the vehicle is arranged on the map M. Hereinafter, an example of control when the map screen shown in FIG. 10 is displayed will be described. The icon of this embodiment may be replaced with a character, a symbol, a figure, or another object.

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 received light amount according to the first signal Sig1 and the second received light amount according to the second signal Sig2 (step S3). Next, the control unit 11 determines whether the calculated difference is equal to or more than a threshold value (step S4). When 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 determines that the speed measuring device 30 is not detected and does not notify that the speed measuring device 30 exists.

On the other hand, when the calculated difference is equal to or larger than the threshold value, the control unit 11 determines “YES” in step S4 and performs the notification control (step S5). The notification control is control for notifying the existence of the speed measuring device 30. The notification control can be said to be a control for issuing an alarm for making the user recognize what the speed measuring device does. The notification control is control for notifying the user of the existence of the speed measuring device 30 by the first method here. The notification control includes, for example, control for displaying a notification screen on the display unit 13.

FIG. 11 is a diagram showing an example of the notification screen. The notification screen shown in FIG. 11 is a screen in which the window W1 is placed on the map screen described above. In the window W1, there are arranged an icon M1 indicating the existence of the speed measuring device 30 and a message indicating that the speed measuring device 30 is present, “You are approaching the speed control point. Please be careful.”. The icon M1 is an icon that allows the user to recognize that the speed measuring device 30 is compatible with the optical system. The notification control may include control of outputting a notification sound from the speaker 14. In this case, the control unit 11 may output a voice from the speaker 14 "The laser is approaching the speed control point. Please be careful." The notification control may include controls other than these, and may include, for example, control of causing the light emitting unit 23 to emit light. The notification control may be any control that notifies the existence of the speed measuring device 30 by a method that allows the user to recognize it.

Next, the control unit 11 determines whether to end the processing of FIG. 8 (step S6). The timing for ending the process is not particularly limited, but may be triggered by, for example, turning off the power of the electronic device 10 by operating the operation unit 19 or stopping the route guidance function. When determining “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 the threshold value or more to the threshold value or less, the control unit 11 determines “NO” in step S4 and stops the notification control. In this case, the control unit 11 causes the display unit 13 to display the map screen shown in FIG. This is because it means that the vehicle passed the speed control point. When determining “YES” in step S6, the control unit 11 ends the process of FIG. 8 (step S7).

Here, the reason why the speed measuring device 30 can be detected by the above-described method will be described. As described with reference to FIG. 6, the first wavelength selection unit 121 selects the light of the specific wavelength λout (more specifically, the wavelength region from the wavelength λ1a to the wavelength λ1b) in which the pulsed light Lout has energy, Make it transparent. Therefore, the first signal Sig1 should show a large light receiving amount during the period in which the pulsed light Lout is received, and a small light receiving amount during the other periods. However, the light receiving unit 12 may receive not only the pulsed light Lout, which is the object of light reception, but also ambient light. This ambient light may be mistaken for pulsed light. As the ambient light, for example, there is light that the sunlight is periodically blocked by the branches and leaves of the tree swayed by the wind. Other disturbance light includes light from a traffic signal or advertisement that is repeatedly turned on and off, and light from a rotation warning light that rotates at a constant speed. Further, the light received by the light receiving unit also changes due to the vibration of the light receiving unit. For example, when the vehicle 40 travels in a place where periodic vibrations are generated, such as on a pier, the direction of the light receiving unit 12 (for example, the first light receiving element 122) is changed, and light such as sunlight is emitted to a predetermined level. The light may be received as light that is repeatedly turned on and off at regular intervals. Even in such a case, the first signal Sig1 exhibits a relatively large amount of received light.

On the other hand, the second wavelength selection unit 123 blocks the light of the specific wavelength λout (in the present embodiment, the wavelength region from the wavelength λ2a to the wavelength λ2b) in which the pulsed light Lout has energy, and blocks the other wavelength regions. Allows light to pass through. Therefore, the amount of received light of the second signal Sig2 is small during the period in which the pulsed light Lout is received. The second light receiving element 124 receives the disturbance light, and such disturbance light generally has a wide wavelength region in which energy is distributed. Therefore, it is considered that the light receiving amount of the second light receiving element 124 becomes large even when the light receiving unit 12 receives the ambient light that is periodically turned on and off. Therefore, when the received light amount of the first signal Sig1 is large and the received light amount of the second signal Sig2 is small, that is, when the difference in the received light amount is equal to or more than the threshold value, it can be estimated that the pulsed light Lout is received. On the other hand, when the received light amount of the first signal Sig1 is large and the received light amount of the second signal Sig2 is also large, that is, when the difference in the received light amount is less than the threshold value, it is unlikely that the pulsed light Lout is received. Can be estimated. Therefore, according to the electronic device 10, by receiving the light using the first light receiving element 122 and the second light receiving element 124, it is expected that the detection accuracy of the speed measuring device 30 is improved.

<1-2-2. Radar system notification>
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.

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

Next, the control unit 11 determines whether or not the speed measuring device is detected based on the result of the determination process (step S13). When it determines with "YES" in step S13, the control part 11 performs notification control (step S14). The notification control is control for notifying the user of the existence of the speed measuring device by the third method here. 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 the window W2 is placed on the map screen described above. In the window W2, an icon M2 indicating the existence of the speed measuring device 30 and a message indicating that the speed measuring device is present, such as "You are approaching the speed control point. Please be careful." The icon M2 is an icon that allows the user to recognize that the speed control device is compatible with the radar system. That is, the icon M2 is different from the icon M1. The notification control may include control of outputting notification sound from the speaker 14. In this case, the control unit 11 may output a voice from the speaker 14 "A radar is approaching a speed control point. Please be careful." The information control may be a control other than these, and may include, for example, control for causing the light emitting unit 23 to emit light. Also in this case, the notification control may be any control that notifies the existence of the speed measuring device by a method that allows the user to recognize the existence.

<1-3. Modified Example of 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 measuring device 30 emits light having a pulse waveform, referring to the number of pulses is also useful in detecting the speed measuring device 30. FIG. 15 is a diagram showing an example of the waveform of the pulsed light Lout received by the electronic device 10. 15A shows a case where the distance between the electronic device 10 and the speed measuring device 30 is relatively large, and FIG. 15B shows a case where the distance between the electronic device 10 and the speed measuring device 30 is relatively small. As shown in FIG. 15A, when the distance between the speed measuring device 30 and the electronic device 10 is relatively large, the pulse light Lout traveling in the direction of the electronic device 10 can be received. The pulsed light propagating only in a close position (for example, right next to the speed measuring device 30) is not received. Therefore, the light receiving period Rx1 of the pulsed light Lout becomes relatively shorter than the non-light receiving period Rx2. As shown in FIG. 15B, when the distance between the speed measuring 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 speed measuring device 30 on the road. It can also receive pulsed light in a direction that propagates only at a position close to. Therefore, the light receiving period Rx1 of the pulsed light Lout becomes relatively longer than the non-light receiving period Rx2. Also, it is considered that the number of pulses is reduced immediately after the vehicle 40 passes the position of the speed measuring device 30.

Therefore, the control unit 11 may perform notification control according to the number of pulses. The control unit 11 may change the notification level according to the number of pulses included in the pulsed light reception period, for example. The notification level is an index of how important the content of the notification is to the user, and may be paraphrased as an alarm level in the present embodiment. 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, the control unit 11 is close to the speed measuring device 30 during the period in which the number of pulses is equal to or more than the threshold value or the period in which the number of pulses is increasing, and thus raises the notification level. Since the control unit 11 is far from or away from the speed measuring device 30 during the period in which the number of pulses is less than the threshold value or the period in which the number of pulse widths is decreasing, the control unit 11 lowers the notification level. The control unit 11 changes 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.

Further, the control unit 11 may estimate the distance from the number of pulse widths and notify the distance 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 the 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.

By the way, as shown in FIG. 17, when another vehicle is present in front of the vehicle 40, there is a possibility that the vehicle C traveling in front may block all or part of the pulsed light Lout. In this case, the positional relationship may not be accurately specified even if the number of pulses is referred to. Therefore, the control unit 11 detects whether or not there is another vehicle C ahead of the vehicle 40 within a predetermined range, here, in front. The control unit 11 may perform the notification control according to the number of pulses when the other vehicle C does not exist, and may stop the notification control when the vehicle C exists. Stopping the notification control according to the number of pulses may be such 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, and may perform the notification control when the inter-vehicle distance is equal to or more than the threshold. The method of detecting the vehicle C is not particularly limited, but there is a method of using the vehicle-mounted camera 50. The vehicle-mounted camera 50 is, for example, a camera used in a drive recorder, and here images the front of the vehicle 40.

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 vehicle-mounted 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 does not matter, but for example, there is a pattern matching method. Then, the control unit 11 determines whether or not there is a vehicle ahead (step S23). When determining "NO" in step S23, the control unit 11 determines to perform the notification control according to the number of pulses (step S24). In this case, the control unit 11 performs processing such as rewriting the flag to a value indicating that control is performed according to the number of pulses. When determining "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 processing such as rewriting the predetermined flag to a value indicating that control is not performed according to the number of pulses. Although the vehicle in front of the vehicle 40 is detected here, it may be in the rear of the vehicle 40 or the like. The electronic device 10 may include the vehicle-mounted 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 the other vehicle C is reduced.

<1-3-2. Control according to pulse width or pulse interval>
When the speed measuring device 30 emits pulsed light, it is also useful to refer to the pulse width or the pulse interval in order to detect the speed measuring device 30. The speed measuring device 30 emits pulsed light of a specific wavelength with a predetermined duty ratio. Further, from the viewpoint of safety, the duty ratio of the pulsed light is set to a predetermined value or less. Therefore, the control unit 11 may determine whether or not the speed measuring 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, the control unit 11 determines that the speed measurement device 30 exists when the pulse width or the pulse interval serving as the reference is included within a certain range, but otherwise determines that the speed measurement device 30 does not exist. 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 that the ambient light is erroneously recognized as the light from the light emitting device.

<1-3-3. Control according to the intensity of pulsed light>
It is also useful for detecting the light emitting device to refer to the intensity of the pulsed light of the received light. The intensity of the pulsed light increases as the vehicle 40 approaches the speed measuring device 30, and the distance decreases as the vehicle 40 moves away. Therefore, the controller 11 may change the notification level according to the amount of pulsed light received by the first light receiving element 122. For example, the control unit 11 may increase the notification level when the intensity of the pulsed light is increasing, and may decrease the notification level when the intensity of the pulsed light is decreasing to notify. In addition, the control unit 11 may determine that the speed measuring device 30 does not exist when the amount of received pulsed light is less than or equal to the threshold value. 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.

<1-3-4. Notification of presence/absence of imaging>
After performing the notification control, the control unit 11 may perform the control of notifying that the image is captured or not, depending on whether or not the predetermined light is detected. When the image capturing unit 32 captures an image, the strobe 33 emits light. Therefore, after performing the notification control, the control unit 11 may further notify that the image was captured when the light of the strobe 33 is detected. Alternatively, the control unit 11 may notify that the image is not captured when the light of the strobe 33 is not detected after performing the notification control. This allows the user to know whether the vehicle 40 has been imaged. The light reception from the strobe 33 may be performed using the light receiving unit 12 or another light receiving unit.

[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 the pulsed light and the microwave are not received. The electronic device of this embodiment may or may not have some or all of the functions of the above-described first embodiment.

<2-1. Configuration of 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, in the road Ar1 which is also called a green belt and is also used for school roads, it is particularly important to keep the speed limit of the vehicle 40, and the speed measuring device 30 may be installed. It is considered to be higher than Ar2. Therefore, the control unit 11 may notify the existence of the speed measurement device 30 when the electronic device 10 is located on a road of a predetermined type.

<2-2. Operation of 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 receiving unit 16 (step S31). Next, the control unit 11 determines whether or not the current position indicated by the position information is within the predetermined area (step S32). Here, the control unit 11 determines whether or not the vehicle 40 is on the green belt based on the current position and the data stored in the storage unit 18. The control part 11 performs notification control, when it determines with "YES" at step S32 (step S33). The notification control includes, for example, control for displaying a notification screen on the display unit 13.

FIG. 21 is a diagram showing an example of the notification screen. The notification screen shown in FIG. 21 is a screen in which the window W3 is placed on top of the map screen described above. In the window W3, an icon M3 indicating the existence of the speed measuring device 30 and a message indicating that the speed measuring device is present, such as "It is within a caution area for speed control", are arranged. The icon M3 is an icon that allows the user to recognize that the speed control point is performed based on the position information. That is, for example, the icon M3 is different from the icons M1 and M2. The notification control may include control of outputting notification sound from the speaker 14. In this case, it is preferable that the control unit 11 output a voice "in the caution area for speed control." from the speaker 14. The notification control may include controls other than these, and may include, for example, control of causing the light emitting unit 23 to emit light. The predetermined area is not limited to the green belt and may be a one-way road or another type of road.

In this way, the presence of the light emitting device can be notified based on the position information, so that the presence thereof can be notified without receiving the pulsed light from the speed measuring device 30.

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

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 sections 12A, 12B, 12C may be the same as that of the light receiving section 12 except for the characteristics of the wavelength selecting section. Note that in FIG. 22, the illustration of the display unit 13 to the cable terminal unit 24 described in FIG. 6 is omitted.

FIG. 23 is a diagram showing the characteristics of the first wavelength selecting section 121 of the light receiving sections 12A, 12B, and 12C and the second wavelength selecting section 123 of this embodiment. 23A corresponds to the light receiving portion 12A, FIG. 23B corresponds to the light receiving portion 12B, and FIG. 23C corresponds to the light receiving portion 12C. As shown in FIGS. 23A to 23C, the wavelengths of the pulsed light targeted for light reception are different in each of the light receiving units 12A, 12B, and 12C. As shown by the solid line in FIG. 23(a), the first wavelength selecting unit 121 of the light receiving unit 12A transmits light in the wavelength region including the specific wavelength λout1, here, the wavelength region from the wavelength λ11a to the wavelength λ11b. It blocks light in a different wavelength range from. As shown by the broken line in FIG. 23A, the second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout1, here, a wavelength region from the wavelength λ21a to the wavelength λ21b, and a wavelength different from this. Allows light in the area to pass through. As shown by the solid line in FIG. 23(b), the first wavelength selecting unit 121 of the light receiving unit 12B transmits light in the wavelength region including the specific wavelength λout2, here, the wavelength region from the wavelength λ12a to the wavelength λ12b. It blocks light in a different wavelength range from. As shown by the broken line in FIG. 23B, the second wavelength selection unit 123 blocks light in the wavelength region including the specific wavelength λout2, here, the wavelength region from the wavelength λ22a to the wavelength λ22b, and a different wavelength from this. Allows light in the area to pass through. As shown by the solid line in FIG. 23(c), the first wavelength selecting unit 121 of the light receiving unit 12C transmits light in the wavelength region including the specific wavelength λout3, here, the wavelength region from the wavelength λ13a to the wavelength λ13b. It blocks light in a different wavelength range from. As shown by the broken line in FIG. 23C, the second wavelength selection unit 123 blocks light in a wavelength region including the specific wavelength λout3, here, a wavelength region from the wavelength λ23a to the wavelength λ23b, and a wavelength different from this. Allows light in the area to pass through. λout1, out2, and out3 are, for example, 850 nm, 950 nm, and 1900 nm, but are not limited to these.

When the control unit 11 detects the speed measuring 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 measuring device 30 is present. .. According to this embodiment, even if there are a plurality of speed measuring devices 30 having different wavelengths of light emitted by the electronic device 10 or the wavelength of light emitted by the speed measuring device 30 is changed, the presence of the speed measuring device 30 is present. Can be notified.

The characteristics of the plurality of light receiving units 12 may be the same. In this case, as shown in FIG. 24, light receiving units 12A, 12B, 12C may be provided at different positions of vehicle 40. Here, the light receiving portion 12A is provided at the left front portion, the light receiving portion 12B is provided at the center front portion, and the light receiving portion 12C is provided at the right front portion. Thereby, the arrival direction of the laser can be estimated based on the laser receiving timing of the light receiving units 12A, 12B, and 12C. For example, the light receiving timing of the light receiving unit 12A is relatively early when the light is received from the front left, and the light receiving timing of the light receiving unit 12C is relatively early when the light is received from the right front. Further, the control unit 11 may inform the user of the direction in which the pulsed light has arrived.

The speed measurement unit 31 also emits pulsed light to a mirror that rotates at a constant speed, and emits pulsed light Lout reflected by this mirror. Therefore, the light receiving timing of the pulsed light Lout in each of the light receiving units 12A, 12B, and 12C includes, for example, the rotation speed of the mirror, the positions of the light receiving units 12A, 12B, and 12C, and the light receiving units 12A, 12B, and 12C and the speed measurement. Differences appear depending on the distance from the device 30. Therefore, the control unit 11 may detect the speed measuring device 30 based on the light receiving timing of the pulsed light Lout in the light receiving units 12A, 12B, and 12C.

The light receiving sections 12A, 12B, and 12C may have different directions of light received. For example, the light receiving elements 12A, 12B, and 12C may have different directions of the light receiving elements by 20 degrees. As a result, there is a possibility that it is possible to suppress a decrease in detection accuracy due to the installation position of the speed measuring device 30. In this embodiment, the number of light receiving parts may be two or four or more.

[4. 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 the photodiode PD1 here. Light that has passed 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 end 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 the photodiode PD2 here. Light that has passed 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 end 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. As a result, the output terminal of the differential amplifier AMP outputs a signal corresponding to the difference in the amount of light received by the photodiodes PD1 and PD2. The control unit 11 detects the speed measuring device 30 based on this difference. The control unit 11 may detect the speed measuring device 30 based on the signal amplified by the differential amplifier AMP.

[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, the display unit 13, the light emitting unit 23, and the illuminance sensor 201 of the sensor unit 20 are provided on the front surface of the housing of the electronic device 10. The speaker 14 is provided so as to output sound from the upper 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 right end surface of the housing 100. The light receiving unit 12 is provided on the upper right 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 on the lower left part of the back surface of the housing 100. The area 104 is an area where a model name and a serial number are written.

[6. Modification]
The present disclosure is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit.

(Modification 1)
The first wavelength selecting unit 121 and the second wavelength selecting unit 123 may not be band pass filters, respectively. The first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured by, for example, a combination of a low pass filter and a high pass filter. Further, the second wavelength selection unit 123 may be a low pass filter as shown by the characteristic of FIG. In this example, the second wavelength selection unit 123 transmits light in the wavelength region lower than the wavelength λ2a and blocks light in the wavelength region higher than that. The second wavelength selection unit 123 may be a high pass filter, as shown by the characteristics of FIG. In this example, the second wavelength selection unit 123 transmits light in the wavelength region higher than the wavelength λ2b and blocks light in the wavelength region lower than that. Even in this case, the amount of received light of the second signal Sig2 is extremely small during the period in which the pulsed light Lout is received. The light receiving unit 12 receives not only the pulsed light Lout for receiving light but also ambient light, but such ambient light generally has a wide wavelength region in which energy is distributed. Therefore, even when the light receiving unit 12 receives the ambient light that is repeatedly turned on and off, the amount of received light is considered to be large. Therefore, when the received light amount of the first signal Sig1 is large and the received light amount of the second signal Sig2 is small, that is, when the difference is equal to or more than the threshold value, it can be estimated that the pulsed light Lout is received. On the other hand, when the received light amount of the first signal Sig1 is large and the received light 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 pulsed light Lout is unlikely to be received. .. Therefore, according to the electronic device 10, by using the first light receiving element 122 and the second light receiving element 124 to receive light, it is expected that the detection accuracy of the speed measuring device 30 is improved. In addition, the first wavelength selection unit 121 and the second wavelength selection unit 123 may be configured by using an optical element other than a filter such as a prism.

(Modification 2)
In the above-described embodiment, the light receiving unit 12 has the first light receiving element 122 and the second light receiving element 124, but it may be configured to have only one. FIG. 28 is a diagram showing the configuration of the electronic device 10 in this modification. 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 the 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 drive unit 60. The drive unit 60 moves the first wavelength selection unit 121 and the second wavelength selection unit 123 under the control of the control unit 11. The drive unit 60 has, for example, a motor and a gear. During 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. 29A, 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 acquired from the light receiving element 128 at this time as the first signal Sig1. Next, as shown in FIG. 29B, the control unit 11 first separates the first wavelength selecting unit 121 from the light receiving surface of the light receiving element 128 and provides the second wavelength selecting unit 123 on the light receiving surface. Then, the control unit 11 acquires the signal acquired from the light receiving element 128 at this time as the second signal Sig2. Then, the control unit 11 detects the speed measuring device 30 based on the first signal Sig1 and the second signal Sig2.

(Modification 3)
In the above-described embodiment, the light receiving unit 12 has the two first light receiving elements 122 and the second light receiving elements 124, but it is preferable to have three or more light receiving elements. Even in this case, the control unit 11 can be expected to improve the detection accuracy of the speed measurement device 30 by changing the wavelength range of the selected light in each of the three or more light receiving elements.

(Modification 4)
In the above description, the light receiving section 12 has at least one set of the wavelength selecting section and the light receiving element. Instead of this, the light receiving unit 12 may have a configuration including at least one light receiving element without including the wavelength selecting unit. For example, the light receiving unit 12 may receive the third light receiving amount when the specific wavelength is selected and received instead of the second light receiving amount which is the light receiving amount of the light having the wavelength different from the specific wavelength. In this case, the control unit 11 may perform control for notifying the presence of the speed measuring device 30 based on the second light receiving amount and the third light receiving amount.

In addition, the light receiving unit 12 may receive the light that is incident by a single light receiving element. Then, the control unit 11 may perform control for notifying the presence of the speed measuring device 30 based on the pulse width or the pulse interval specified based on the amount of light received by the light receiving unit 12. The method using the pulse width or the pulse interval may be similar to that of the modification of the first embodiment described above.

(Modification 5)
The light receiving element may be an image pickup element included in a camera such as a drive recorder. For example, the control unit 11 acquires a captured image of the vehicle-mounted camera 50 and analyzes the image. The vehicle-mounted camera is preferably a camera that does not have an infrared cut filter. This is to prevent the pulsed light Lout from being blocked. Then, as a result of the image analysis, the control unit 11 performs the control of notifying the existence of the speed measuring device 30 when the light of the specific pattern is received. The control unit 11 may detect the light of a specific pattern based on a change in brightness that indicates light of a specific wavelength. When the light of a specific pattern is received, the control unit 11 may record the captured image in the period corresponding to the light receiving period. The period is, for example, a period of 1 minute before and after the timing when the light of the specific pattern is received, but is not limited to this.

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

(Modification 7)
When detecting the speed measuring device 30, the electronic device 10 may indicate the position of the speed measuring device 30 and upload information such as position information 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.

The system according to the present disclosure can be applied to detection of a light emitting device that emits light of a specific wavelength, in addition to detection of the speed measurement device.

(Modification 8)
Some 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 system and does not support the radar system. In addition, for example, the positions, shapes, and sizes of the respective components 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 license plate. In this case, the control unit 11 may acquire the signal from the light receiving unit 12 via the communication unit 17.

(Modification 9)
In addition, the control unit 11 may determine whether or not the speed measuring device 30 is present, and if it is determined that at least the speed measuring device 30 is present, a signal indicating the determination result may be output to an external device. .. This external device may notify that the speed measuring device 30 is present. Further, the present invention can be specified by a control device (for example, a control module) incorporated in the electronic device 10 and having a function similar to that of the control unit 11.

The scope of the present invention is not limited to the constitutions and limitations explicitly described in the specification, but also includes combinations of various aspects of the present invention disclosed in the specification. Of the present invention, the configuration for which a patent is sought is specified in the appended claims, but the present invention is not disclosed in the claims even if it is not specified in the claims. The intention is to make the structure according to the claims in the future.

The present invention is not limited to the configurations described in the above embodiments. The constituent elements of each of the above-described embodiments and modifications may be arbitrarily selected and combined. Further, any constituent element of each embodiment or modification, and any constituent element described in the means for solving the invention or a constituent materializing any constituent element described in the means for solving the invention. And may be combined arbitrarily. With respect to these, we have the intention to acquire the right in the amendment of this application or the divisional application. Even if there is a description such as "in the case of" and "when it is", it is not described as a configuration limited in that case or at that time. It discloses the cases and the untimely configurations, and intends to acquire the right. Also, the place where the description is accompanied by the order is not limited to this order. It also discloses a configuration in which some parts are deleted or the order is changed, and we have the intention to acquire the right.

In addition, by applying for a change to a design application, the applicant has the intention to acquire the right for the whole design or the partial design. Although the drawing depicts the whole of the device by a solid line, it includes not only the entire design but also a partial design claimed for a part of the device. For example, it is a drawing in which a part of the device is included in the partial design, and a part of the device is included in the partial design regardless of the members. The part of the device may be a part of the device or a part of the member. Not only the whole design, but also the partial design in which any part of the solid line part of the drawing is made into a broken line part is intended to be patented.

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: Storage unit 19: operation unit 20: sensor unit 21: mounting unit 22: power supply unit 23: light emitting unit 24: cable terminal unit 30: speed measuring device 31: speed measuring unit 32: imaging unit 33: strobe 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 selecting unit 122: First light receiving element 123: Second wavelength selecting unit 124: Second 2 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 (20)

A system for detecting a light emitting device that emits light of a specific wavelength,
Of the incident light, a light receiving unit that receives light of a selected wavelength,
Based on a first received light amount when the light receiving unit selects and receives the specific wavelength, and a second received light amount when the light receiving unit selects and receives light having a wavelength different from the specific wavelength, A control unit that performs control for notifying the presence of the light emitting device. The light emitting device emits light having a pulse waveform of the specific wavelength,
The system according to claim 1, wherein the control unit performs the notification control according to at least the number of pulses specified based on the first received light amount. The light receiving unit is provided in the vehicle,
The system according to claim 2, wherein the control unit stops the notification control according to the number of pulses when another vehicle exists within a predetermined range from the vehicle. The light emitting device emits pulsed light of the specific wavelength,
The system according to any one of claims 1 to 3, wherein the control unit performs the notification control according to at least a pulse width or a pulse interval specified based on the first received light amount. The system according to any one of claims 1 to 4, wherein the control unit performs the notification control according to the magnitude of the first received light amount. The system according to any one of claims 1 to 5, wherein the control unit performs the notification control when the position information of the current position satisfies a predetermined condition. 7. The system according to claim 6, wherein the control unit performs the notification control when the current position is on a road of a predetermined type. The control unit notifies the presence of the light emitting device by a first method according to the first received light amount and the second received light amount, and a second method different from the first method according to the current position. The system according to claim 6 or 7, wherein the notification control is performed so as to notify the presence of the light emitting device. Equipped with a radio wave receiving unit that receives predetermined radio waves,
The control unit notifies the presence of the light emitting device by a first method according to the first received light amount and the second received light amount, and the first method according to the reception of the predetermined radio wave. The system according to any one of claims 1 to 8, wherein the notification control is performed so as to notify the presence of the radio wave generator by a different third method. After performing the notification control, the control unit performs control for notifying that an image has been captured or not, depending on whether or not a predetermined light is received by the light receiving unit. The system according to any one of claims 1 to 9. The light receiving unit,
A first wavelength selection unit that selects and transmits light of a specific wavelength from the incident light;
A first light receiving element that receives the light transmitted by the first wavelength selection unit and outputs a first signal according to the first received light amount;
A second wavelength selection unit that selects light having a wavelength different from the specific wavelength from among the incident light and transmits the light;
A second light receiving element that receives the light transmitted by the second wavelength selection unit and outputs a second signal according to the second received light amount;
The system according to any one of claims 1 to 10, comprising: The system of claim 11, comprising a differential amplifier that amplifies a voltage difference between the first signal and the second signal. The system according to claim 11 or 12, further 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 any one of claims 11 to 13, further comprising a visible light cut filter that is provided in the first window and the second window and blocks visible light. The system according to any one of claims 11 to 14, wherein the first light receiving element and the second light receiving element do not have a lens. The system according to any one of claims 12 to 15, wherein 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 1 to 16, wherein the light receiving unit is shielded with a material having electrical conductivity. The system according to claim 1, further comprising a plurality of the light receiving units. The plurality of the light-receiving units have 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. System. A program for causing a computer to realize the function of the control unit of the system according to any one of claims 1 to 19.