JPH11287752A - Waterdrop detection sensor with transmission/reception function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for a prism, achieve simple structure, positively detect a waterdrop adhering to a windshield for a vehicle, and at the same time provide transmission/reception function with light. SOLUTION: With a waterdrop detection sensor, a waterdrop W adhering to a windshield 2 is detected due to the change in the quantity of reflection light of detection light and at the same time a transmission/reception function for communication with the outside optically is provided. In this case, a light- emitting means 5 for applying detection light to the windshield 2 and a light reception means 6 for detecting light that is totally reflected in the windshield 2 out of the detection light are allowed to adhere to the side surface of the inside of the windshield 2 with an adhesive member 4. At the same time, a light transmission/communication means 9 for communicating with the outside optically is allowed to adhere to the indoor side surface of the wind shield 2 with the adhesive member 4 while avoiding the reflection point part of detection light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water drop detection sensor having a transmission / reception function for detecting water drops adhering to a window glass for an automobile and transmitting / receiving data to / from the outside.

[0002]

2. Description of the Related Art Conventionally, an attempt has been made to automatically operate a wiper by detecting that raindrops have adhered to a windshield of an automobile. A substrate having such a detection function is shown in FIG. Some have the structure shown.

That is, prisms 101 and 102 are adhered to the surface of a transparent substrate 100 such as a glass plate, and the light from the light source 103 is introduced into the transparent substrate 100 through the prism 101 at an angle that allows total reflection. If the incident angle is set so that total reflection does not occur when a liquid such as water is present on the surface of the transparent substrate 100, the amount of total reflection changes depending on the presence or absence of the liquid at the point of total reflection on the glass surface. By detecting the amount of change with the light receiving element 104 or the like, the presence of the liquid can be known.

Japanese Unexamined Patent Publication No. Sho 60-216245 discloses that light from a light source is totally reflected by a glass plate surface and incident on a light receiving element via a prism, as in the above-described detection method. However, since the detection sensitivity is poor, the content of setting the angle of the prism such that the reflected light from the water droplet enters the light receiving element only when the water droplet adheres to the glass surface is disclosed.

In Japanese Patent Application Laid-Open No. 62-163949, two light sources are prepared, the angle of incidence of a light beam from one light source on a detection surface is made equal to or greater than the critical angle of total reflection, and the light beam from the other light source is emitted. A configuration is disclosed in which the angle of incidence on the detection surface is set to be equal to or less than the critical angle of total reflection so that it can be distinguished from attached matter other than water.

Further, Japanese Patent Application Laid-Open No. Hei 8-261974 discloses that a comb-shaped transparent electrode is arranged inside a glass plate, and a change in capacitance between the comb-shaped transparent electrodes caused by water droplets adhering to the surface of the glass plate. Is disclosed, and the opening and closing of the window and the control of the heater are performed in response to the detection.

Japanese Patent Application Laid-Open No. 6-509652 discloses a method for detecting water droplets on the outer surface of a windshield and controlling the operation of a windshield wiper in response to the water droplets. A configuration is disclosed in which a sensing unit including a prism and the like is bonded by an intermediate layer having two sticky surfaces.

[0008]

In a conventional transparent substrate having an optical detection function, a prism is indispensable for introducing total reflection light into glass, and this prism is mounted on a glass surface. It is necessary to make them adhere to each other, and the installation work is troublesome. In particular, many windshield glasses and the like have a curved design, and it is difficult to bring them into close contact with each other. In addition, in order to avoid unnecessary reflection at the interface between the prism and the glass surface, it is necessary to make the refractive indexes as close as possible (refractive index matching). For this purpose, it is conceivable to provide a matching layer, but the number of steps is increased and disadvantages are caused in cost.

On the other hand, a method of detecting a change in electric resistance between electrodes, a change in electric capacity, and the like as disclosed in Japanese Patent Application Laid-Open No. 8-261974 is inferior to an optical method in terms of durability and sensitivity. In a windshield for an automobile, it is important that the signal follows the visibility of a driver or a passenger, and an optical sensor is desirable.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to eliminate the need for a prism, to have a simple structure, and to adhere to an automobile window glass. It is an object of the present invention to provide a water drop detection sensor with a transmission / reception function for reliably detecting a water drop and transmitting / receiving to / from the outside.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 is a transmission / reception function for detecting water droplets attached to a window glass based on a change in the amount of reflected light for detection and transmitting / receiving data to / from the outside. A water droplet detection sensor with light emitting means for making the detection light incident on the window glass and light receiving means for detecting light totally reflected inside the window glass among the detection lights on the indoor side surface of the window glass. The transmitting and receiving means for transmitting and receiving to and from the outside is provided on the indoor side surface of the window glass avoiding the reflection point of the detection light.

According to a second aspect of the present invention, there is provided a water drop detection sensor having a transmission / reception function for detecting a water drop attached to a window glass having an intermediate film based on a change in the amount of reflected light of the detection light, and performing transmission / reception with the outside. A light emitting unit for making the detection light incident on the window glass and a light receiving unit for detecting light totally reflected in the window glass among the detection lights are provided on the indoor side surface of the window glass, and transmission and reception to and from the outside are performed. Means are provided on the indoor side surface of the window glass avoiding the reflection point of the detection light, and a portion of the intermediate film facing the light receiving means is a reflection film.

According to a third aspect of the present invention, there is provided a water drop detection sensor having a transmission / reception function for detecting a water drop adhered to a window glass having an intermediate film by a change in the amount of reflected light of the detection light, and performing transmission / reception with the outside. A light-emitting unit for causing the detection light to enter the window glass and a light-receiving unit for detecting light totally reflected inside the window glass among the detection lights are provided on the indoor side surface of the window glass and are not coated with black ceramic. And a reflection point portion of the detection light is an uncoated portion of black ceramic, and a transmission / reception means for transmitting / receiving to / from the outside via an air layer is provided in the uncoated portion.

According to a fourth aspect of the present invention, there is provided a water drop detection sensor having a transmission / reception function for detecting a water drop attached to a window glass having an intermediate film based on a change in the amount of reflected light of the detection light, and performing transmission / reception with the outside. A light-emitting unit for causing the detection light to enter the window glass and a light-receiving unit for detecting light totally reflected inside the window glass among the detection lights are provided on the indoor side surface of the window glass and are not coated with black ceramic. Wherein the reflection point portion of the detection light is a non-coating portion of black ceramic, and a transmission / reception means for transmitting and receiving with the outside is provided in the black ceramic non-coating portion avoiding the reflection point portion.

The invention according to claim 5 is the invention according to claims 1, 2, and 3
Or in the water drop detection sensor with transmission / reception function described in 4,
The transmitting and receiving means is an optical transmitting and receiving means for transmitting and receiving light.

The invention according to claim 6 is the invention according to claims 1, 2, and 3
Or in the water drop detection sensor with transmission / reception function described in 4,
The transmitting and receiving means may be a sound wave transmitting and receiving means for transmitting and receiving sound waves.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a perspective view of a front part of an automobile equipped with a water drop detection sensor with a transmission / reception function according to the present invention, and FIG. 2 is an explanatory diagram of a configuration of a water drop detection sensor with a transmission / reception function according to the first embodiment of the present invention. FIG. 3 is a configuration diagram in which a water droplet detection sensor with a transmission / reception function according to the present invention is applied to a wiper control and an automatic toll collection system. FIGS. 4 to 6 are transmission / reception functions according to second to fourth embodiments of the present invention. FIG. 3 is an explanatory diagram of a configuration of a attached water droplet detection sensor.

As shown in FIG. 1, a water drop detecting sensor 1 with a transmission / reception function is provided on an indoor side surface of a windshield 2 of an automobile, at a position facing a wiping area of a wiper 3 for wiping an outer side surface. 4 attached. In addition,
The windshield 2 is made of 5 m mainly composed of SiO _2.
An m-thick soda lime glass substrate is used.

As shown in FIG. 2, a water drop detecting sensor 1 with a transmission / reception function according to a first embodiment of the present invention includes a light emitting means 5 for emitting detection light, and a light receiving means for detecting the detection light. 6 and an optical transmitting and receiving means 9 for transmitting and receiving information to and from the outside by light. Then, the light emitting means 5 and the light receiving means 6
Are provided with a predetermined interval on the indoor side surface of the windshield 2, and both are fixed by the adhesive member 4 with the light emitting surface 5 a or the light receiving surface 6 a facing the windshield 2. In addition,
Although the transmitting and receiving means is the optical transmitting and receiving means 9 for transmitting and receiving by light, the transmitting and receiving means may be a sound wave transmitting and receiving means for transmitting and receiving by sound waves.

The reason why the light emitting means 5 and the light receiving means 6 are fixed to the indoor side surface of the windshield 2 at predetermined intervals is that the light path length from the light emitting means 5 to the light receiving means 6 is shortened as much as possible and the light is emitted from the light emitting means 5. This is to ensure a predetermined detection area (the number of total reflection points) on the outer surface of the windshield 2 while maintaining the loss of the detection light at or below a predetermined level.

The light transmitting / receiving means 9 is provided between the light emitting means 5 and the light receiving means 6 on the line connecting the light emitting means 5 and the light receiving means 6 or in the vicinity of the off-line, similarly to the light receiving means 6. Are fixed to the windshield 2 with an adhesive member 4.

As the bonding member 4, a member having a refractive index substantially equal to the refractive index (1.48) of the windshield 2, such as an epoxy bonding member or an ultraviolet-curing epoxy bonding member, is selected. Light emitting means 5 and light receiving means 6
May be fixed to the indoor side surface of the windshield 2 with a silicon-based transparent adhesive sheet, and then the light emitting means 5 and the light receiving means 6 may be fixed to the adhesive member 4 so as to be embedded.

Further, there are provided light shielding members 7 and 8 for covering the adhesive member 4 which is provided for fixing the light emitting means 5 and the light receiving means 6 to the windshield 2. The light shielding members 7 and 8 are a resin for optically shielding the adhesive member 4. One of the light shielding members 7 serves to prevent light from leaking from the light emitting means 5 in an unnecessary direction, and the other light shielding member Reference numeral 8 serves to prevent external light or the like from directly entering the light receiving means 6. Therefore, the light leaking from the light emitting means 5 does not directly enter the light receiving means 6 without propagating inside the windshield 2.

The contact surfaces of the light-shielding members 7 and 8 with the adhesive member 4, that is, the surfaces of the light-shielding members 7 and 8 facing the light-emitting means 5 and the light-receiving means 6 are preferably provided with reflection performance. Further, the contact surfaces of the light shielding members 7 and 8 with the adhesive member 4, that is, the surfaces of the light shielding members 7 and 8 facing the light emitting unit 5 and the light receiving unit 6 may be formed as concave mirror surfaces.

As described above, by making the contact surfaces of the light shielding members 7 and 8 with the adhesive member 4 reflective, or by forming the contact surfaces with concave mirror surfaces, the light emitted backward from the light emitting means 5 is collected. It can be used as detection light by traveling in the direction of the windshield 2. Further, the detection light which has propagated inside the windshield 2 but could not be directly incident on the light receiving means 6 can be reflected by the light shielding member 8 to be incident on the light receiving means 6, so that the light can be effectively used.

As shown in FIG. 3, the light emitting means 5 includes a light emitting element 10 such as a light emitting diode (LED) or a laser diode (LD), and a driving circuit 11 for outputting light modulated at a predetermined frequency from the light emitting element 10. A light receiving element 12 such as a photodiode (PD) that monitors the output level of the light emitting element 10, and a detection circuit 13 that extracts a signal corresponding to the modulation component from the output signal of the light receiving element 12 and feeds it back to the drive circuit 11. The drive circuit 11 controls the drive current flowing through the light emitting element 10 so that the output signal of the detection circuit 13 maintains a desired output level.

As shown in FIG. 3, the light receiving means 6 includes a light receiving element 14 such as a PD for converting detection light and external light into an electric signal, and a drive circuit 11 for the light emitting element 10 based on an output signal of the light receiving element 14. The detection circuit 15 includes a detection circuit 15 for extracting a signal corresponding to the modulation component, and an amplification circuit 16 for amplifying or processing the output signal of the detection circuit 15. And the amplification circuit 1
The output signal of No. 6 is input to the wiper drive unit 19 and used for wiper control.

The light transmitting / receiving means 9 comprises a light emitting element, a light receiving element, a modulation / demodulation circuit, and the like, and is connected to the vehicle equipment 20. The optical transmission / reception means 9 and the on-vehicle device 20 are used for an automatic toll collection system or the like, and perform optical communication with, for example, an optical beacon (entrance beacon, notice beacon, toll beacon, etc.) installed on the expressway side, and Toll collection processing is performed through the exchange of information such as entrance and exit tollgate information and vehicle type information.

The light emitting means 5 may be constituted by the light emitting element 10 alone or the light emitting element 10 and the light receiving element 12 for monitoring, and the drive circuit 11 and the detection circuit 13 may be arranged at another place. Further, the light receiving means 6 may be constituted only by the light receiving element 14, and the detection circuit 15 and the amplification circuit 16 may be arranged at another place. Further, the light transmitting / receiving means 9 may be constituted only by the light emitting element and the light receiving element, and the modulation / demodulation circuit may be arranged at another place.

The operation of the water drop detection sensor 1 having the transmission / reception function configured as described above will be described. The light emitted from the light emitting means 5 is emitted in almost all directions when the light emitting element 10 is an LED, and when the light emitting element 10 is an LD,
Radiated in almost one direction. These lights enter the windshield 2 through the adhesive member 4. Since the adhesive member 4 having a refractive index substantially equal to the refractive index of the windshield 2 is selected, the light emitted from the light emitting means 5 travels straight without being refracted at the interface between the adhesive member 4 and the windshield 2.

Then, as shown in FIG. 2, light entering the inside of the windshield 2 at an incident angle smaller than the critical angle passes through the windshield 2 and escapes to the outside. On the other hand, light that enters the inside of the windshield 2 at an angle of incidence equal to or greater than the critical angle is alternately totally reflected at the interface between the outside surface of the windshield 2 and the air and the interface between the indoor side surface of the windshield 2 and the air. The light propagates inside the windshield 2. The light totally reflected inside the windshield 2 enters the light receiving means 6.

Here, the following calculation is performed using Snell's law to determine the incident angle at which total reflection starts at the interface between air and glass, that is, the critical angle. The general expression of Snell's law is as shown in the following expression (1). Here, α and α ₀ are angles with respect to the normal line of the interface between the substance having the refractive index n and the substance having the refractive index n ₀ (α: incident angle, α ₀ : refraction angle).

N ₀ · sin α ₀ = n · sin α (1)

When the refractive index n of glass is n = 1.48 and the refractive index n _{0 of} air is n ₀ = 1, the incident angle at the interface between air and glass and for total reflection inside the glass is given. conditions of alpha is the angle of refraction alpha _0, since it if the alpha ₀ ≧ 90 °,
The incident angle α at that time is given by α ≧ 42.5 ° from Expression (1).
Becomes Therefore, when the incident angle α is equal to or larger than the critical angle (42.5 °), total reflection occurs in the glass medium.

On the other hand, even if water adheres to the glass surface,
The condition of the incident angle α for the total reflection inside the glass at the interface between water and glass is as follows: when the refractive index of water is n ₀ = 1.33 and the same calculation is performed, α ≧ 64.0 ° Becomes Therefore, if the incident angle α is equal to or larger than the critical angle (64.0 °), total reflection occurs in the glass medium.

Therefore, the angle of incidence α is 42.5 ° to 6 °.
In the range of 4.0 ° (42.5 ° ≦ α ≦ 64.0 °), when water does not adhere to the glass, it is totally reflected inside the glass. Will leak out of the glass via water.

In order to cause such reflection, the position where the light emitting means 5 is fixed is adjusted and the condition of the incident angle α (4
(2.5 ° ≦ α ≦ 64.0 °), the incident angle of light emitted from the light emitting means 5 was set. Further, since the incident angle at which the reflected light enters the light receiving means 6 is also symmetrical to that of the light emitting means 5, the position where the light receiving means 6 is fixed is adjusted so as to receive the reflected light without leakage.

Therefore, if water droplets W adhere to either the outer surface or the indoor surface of the windshield 2 or both surfaces, the light that is being propagated passes through the water droplets W to the outside of the windshield 2 and is received. The amount of light reaching the means 6 decreases. Therefore, the amount of decrease in the light amount is detected by the detection circuit 15.
, And the arithmetic processing is performed by the amplifier circuit 16, the degree of adhesion of the water droplet W can be determined.

In the present invention, the condition of the incident angle α (42.5 °
≦ α ≦ 64.0 °), the water droplet W adhering to the surface of the windshield 2 is used in order to use all the light incident within the range satisfying the condition
Is detected not on discrete reflection points of light but on a surface that is a set of a large number of reflection points. The detection accuracy of the water droplet W attached to the surface is improved.

Then, as shown in FIG.
Inputs an output signal corresponding to the amount of water droplets W attached to the wiper driving unit 19. Then, the wiper driving unit 19 activates the wiper 3 at intervals according to the amount of the attached water droplet W when the detected amount of the attached water droplet W is equal to or greater than the set value. When the amount becomes less than the set value, the wiper 3 is stopped.

When the car uses a toll road, the optical transmission / reception means 9 performs optical communication with an optical beacon (entrance beacon, notice beacon, toll beacon, etc.) installed on the highway side, and And toll collection processing together with the vehicle-mounted device 20 through information exchange such as exit tollgate information and vehicle type information.

As shown in FIG. 4, a water drop detecting sensor 21 having a transmitting / receiving function according to a second embodiment of the present invention includes a light emitting unit 5, a light receiving unit 6, a light transmitting / receiving unit on a windshield 2 having an intermediate film 22. 9 was fixed, and portions of the intermediate film 22 facing the light emitting surface 5a of the light emitting means 5 and the light receiving surface 6a of the light receiving means 6 were used as reflective films 23 and 24. Although the transmitting and receiving means is the optical transmitting and receiving means 9 for transmitting and receiving by light, the transmitting and receiving means may be a sound wave transmitting and receiving means for transmitting and receiving by sound waves.
Other configurations are the same as those of the water drop detection sensor 1 with a transmission / reception function shown in FIG.

The one reflection film 23 is provided to prevent the light emitted from the light emitting means 5 that does not totally reflect inside the windshield 2 from leaking to the outside. The other reflection film 24 is in a range that does not block light totally reflected inside the windshield 2 from being incident on the light receiving unit 6.
It is provided to prevent external light from entering the light receiving means 6 more than necessary.

The operation of the water drop detection sensor 21 with the transmission / reception function configured as described above is similar to that of the water drop and light quantity detection sensor 1 shown in FIG. The same is true.

As shown in FIG. 5, a water drop detecting sensor 31 with a transmission / reception function according to a third embodiment of the present invention has a black ceramic 32 applied in a band shape to the periphery of the windshield 2 on the indoor side surface. Uncoated portions 32a of the black ceramic 32 are formed therein, and these uncoated portions 3a are formed.
The light emitting means 5 and the light receiving means 6 are fixed to 2a by the adhesive member 4.

Each part of the indoor side surface of the windshield 2 where the detection light emitted from the light emitting means 5 is totally reflected also forms an interface with air similarly to the outside surface of the windshield 2 and is totally reflected under the same conditions. In order to perform this, an uncoated portion 32a of the black ceramic 32 is formed.

At one location of the non-coating portion 32a, an optical transmission / reception means 9 is provided via an air layer 33, and its transmission / reception surface 9a
Is fixed with an adhesive member 4 so as to face the indoor side surface of the windshield 2. The air layer 33 is provided for achieving the same total reflection condition as the outer surface of the windshield 2. Although the transmitting and receiving means is the optical transmitting and receiving means 9 for transmitting and receiving by light, the transmitting and receiving means may be a sound wave transmitting and receiving means for transmitting and receiving by sound waves.

Further, the light emitting means 5, the light receiving means 6, and the light transmitting / receiving means 9 are covered with a case 34 made of glass, resin, ceramics or metal. The case 34 is fixed to the black ceramics 32 by an adhesive member 35 that also functions as a seal member, and the case 34 and the windshield 2 form a closed space.

The air layer 33 formed between the indoor side surface of the windshield 2 and the light transmitting / receiving means 9 has a molecular queue in order to prevent dew condensation at the non-coating portion 32a of the black ceramic 32 which is a reflection point. A dehydrating agent such as LaSieve or dry air is enclosed. Further, a dewatering agent 36 such as a molecular sieve or dry air is sealed in a closed space formed by the case 34 and the windshield 2. Other configurations are the same as those of the water drop detection sensor 21 with the transmission / reception function shown in FIG.

The place where the black ceramics 32 to which the case 34 is fixed is applied is also a place where the interior mirror is attached. By using the case 34 and the case 34 together, an installation space can be saved. In addition,
The method of fixing the case 34 to the black ceramics 32 is as follows.
After the fixing member is fixed to the black ceramic 32 with an adhesive, the flange formed on the case 34 can be fixed to the fixing member with screws.

The operation of the water droplet detection sensor 31 with the transmission / reception function configured as described above will be described with reference to the windshield 2.
4 except that the light emitting means 5, the light receiving means 6, and the light transmitting and receiving means 9 are fixed to the peripheral portion of the indoor side surface where the black ceramics 32 is applied in a strip shape. This is the same as the detection sensor 21.

As shown in FIG. 6, a water drop detecting sensor 41 having a transmitting / receiving function according to a fourth embodiment of the present invention comprises a light transmitting / receiving means 9 for transmitting a windshield 2 for totally reflecting detection light.
The configuration is the same as that of the water drop detection sensor 31 with the transmission / reception function shown in FIG. Although the transmitting and receiving means is the optical transmitting and receiving means 9 for transmitting and receiving by light, the transmitting and receiving means may be a sound wave transmitting and receiving means for transmitting and receiving by sound waves.

Windshield 2 from which detection light is totally reflected
By providing the light transmitting and receiving means 9 avoiding each part of the indoor side surface, it is not necessary to form the air layer 33 for the same total reflection condition as the outer side surface, and furthermore, like the light emitting means 5 and the light receiving means 6 The light transmitting / receiving means 9 can be directly fixed to the indoor side surface of the windshield 2.

The operation of the water droplet detection sensor 41 having the transmission / reception function configured as described above is the same as the operation except that the light transmission / reception means 9 avoids each part on the indoor side surface of the windshield 2 where the detection light is totally reflected. This is the same as the water drop detection sensor 31 with the transmission / reception function shown in FIG.

[0055]

As described above, according to the first aspect of the present invention, no prism is required and the structure is simplified. In addition, it detects water droplets attached to a surface that is a set of many reflection points instead of discrete light reflection points, so detection accuracy is improved compared to detecting only water droplets attached to discrete reflection points I do. Further, since a transmission / reception means capable of transmission / reception to / from outside the vehicle is provided, the range of application as a sensor is expanded.

According to the second aspect of the present invention, the portion of the intermediate film that faces the light-emitting surface of the light-emitting means and the light-receiving surface of the light-receiving means is a reflective film. It is possible to prevent light that is not totally internally reflected from leaking to the outside and prevent external light from being incident on the light receiving unit. In addition, the provision of the transmission / reception means capable of transmission / reception to / from outside the vehicle broadens the range of application as a sensor.

According to the third aspect of the present invention, the light emitting means, the light receiving means, and the optical beacon transmitting / receiving means are fixed to a portion of the window glass on the side surface of the room where the black ceramic is applied in a strip shape. The mounting space can be shared with the mounting base of the interior mirror, etc., which contributes to the saving of mounting space. In addition, the provision of the transmission / reception means capable of transmission / reception to / from outside the vehicle broadens the range of application as a sensor.

According to the fourth aspect of the present invention, the transmitting / receiving means is fixed so as to avoid each part of the indoor side surface of the window glass from which the detection light is totally reflected, so that the air layer is not interposed on the indoor side surface of the window glass. It can be fixed directly, and mounting is easy. In addition, the provision of the transmission / reception means capable of transmission / reception to / from outside the vehicle broadens the range of application as a sensor.

According to the fifth aspect of the invention, the transmitting and receiving means is an optical transmitting and receiving means for transmitting and receiving light.
The range of application as a sensor expands.

According to the invention of claim 6, since the transmitting / receiving means is a sound wave transmitting / receiving means for transmitting / receiving sound waves, the range of application as a sensor is expanded.

[Brief description of the drawings]

FIG. 1 is a perspective view of a front part of a vehicle equipped with a water droplet detection sensor having a transmission / reception function according to the present invention.

FIG. 2 is a configuration explanatory diagram of a water drop detection sensor with a transmission / reception function according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram in which a water droplet detection sensor with a transmission / reception function according to the present invention is applied to a wiper control and an automatic toll collection system.

FIG. 4 is a configuration explanatory view of a water drop detection sensor with a transmission / reception function according to a second embodiment of the present invention.

5A and 5B are explanatory diagrams illustrating a configuration of a water drop detection sensor with a transmission / reception function according to a third embodiment of the present invention, wherein FIG.
(B) is a rear view

FIG. 6 is an explanatory diagram of a configuration of a water drop detection sensor with a transmission / reception function according to a fourth embodiment of the present invention, where (a) is a cross-sectional view,
(B) is a rear view

FIG. 7 is a configuration diagram of a conventional water droplet detection sensor.

[Explanation of symbols]

1, 21, 31, 41: a water drop detection sensor with a transmission / reception function, 2: windshield (window glass), 3: wiper, 4: adhesive member, 5: light emitting means, 5a: light emitting surface, 6
... light receiving means, 6a ... light receiving surface, 7, 8 ... light shielding member, 9 ... light transmitting and receiving means, 9a ... transmitting and receiving surface, 22 ... intermediate film, 23, 2
4 ... reflective film, 32 ... black ceramic, 32a ... black ceramic non-coated part, 33 ... air layer, 34 ... case,
W: Water drops.

Claims (6)

[Claims] A water drop detection sensor having a transmission / reception function for detecting a water drop adhering to a window glass based on a change in the amount of reflected light of the detection light and transmitting / receiving an external light, wherein the detection light is incident on the window glass. A light-emitting means for causing the light to be detected and a light-receiving means for detecting light totally reflected inside the window glass among the detection lights are provided on the indoor side surface of the window glass, and a transmitting / receiving means for transmitting and receiving to and from the outside is a reflection point portion of the detection light. A water drop detection sensor with a transmission / reception function, which is provided on the indoor side surface of the window glass avoiding the above. 2. A method for detecting a water droplet attached to a window glass having an intermediate film based on a change in the amount of reflected light of the detection light.
A water drop detection sensor with a transmission / reception function for transmitting / receiving to / from the outside, comprising: a light emitting unit for causing the detection light to enter the window glass; and a light receiving unit for detecting light totally reflected in the window glass among the detection light. Provided on the indoor side surface of the window glass, transmitting and receiving means for transmitting and receiving to the outside is provided on the indoor side surface of the window glass avoiding the reflection point portion of the detection light, and a portion of the intermediate film facing the light receiving means. A water drop detection sensor with a transmission / reception function characterized by using a reflection film. 3. A method for detecting a water droplet attached to a window glass having an intermediate film based on a change in the amount of reflected light of the detection light,
A water drop detection sensor with a transmission / reception function for transmitting / receiving to / from the outside, comprising: a light emitting unit for causing the detection light to be incident on the window glass; and a light receiving unit for detecting light totally reflected in the window glass among the detection light. It is provided on the uncoated portion of the black ceramic on the indoor side surface of the window glass, and the reflection point portion of the detection light is an uncoated portion of the black ceramic, and the uncoated portion transmits and receives to and from the outside via an air layer. A water drop detection sensor with a transmission / reception function, comprising transmission / reception means. 4. A method for detecting a water droplet attached to a window glass having an intermediate film based on a change in the amount of reflected light of the detection light,
A water drop detection sensor with a transmission / reception function for transmitting / receiving to / from the outside, comprising: a light emitting unit for causing the detection light to enter the window glass; and a light receiving unit for detecting light totally reflected in the window glass among the detection light. Provided in the uncoated portion of the black ceramic on the indoor side surface of the window glass, the reflection point portion of the detection light is made the uncoated portion of the black ceramic, and the transmitting / receiving means for transmitting and receiving to and from the outside avoids the reflection point portion. A water drop detection sensor with a transmission / reception function, which is provided on a non-coated portion of black ceramic. 5. The water drop detection sensor with a transmission / reception function according to claim 1, wherein the transmission / reception means is an optical transmission / reception means for transmitting / receiving light. 6. The water drop detection sensor with a transmission / reception function according to claim 1, wherein the transmission / reception unit is a sound wave transmission / reception unit that transmits and receives a sound wave.