JP2544715Y2 - Sunlight sensor - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses a photodetector such as a solar cell or a photodiode capable of detecting light having a wavelength longer than visible light.
The present invention relates to a solar radiation sensor for a vehicle that measures a solar radiation direction, a solar radiation amount, and the like.

[Conventional technology]

BACKGROUND ART Conventionally, in order to improve the accuracy of a solar radiation sensor and enable effective detection of sunlight, an exterior cover that covers a light detection element is made transparent.

Also, recently, in order to make the interior of the vehicle comfortable, an automatic control air conditioner that detects the amount of solar radiation by a solar radiation sensor and adjusts the amount of air introduced into the vehicle interior using this data has been proposed (for example, And Japanese Utility Model Application Laid-Open No. 62-137815).

[Problems to be solved by the invention]

However, this type of solar radiation sensor is usually arranged near a driver's seat such as a dashboard in order to effectively detect sunlight. For this reason, the solar radiation sensor may be reflected on the windshield, or the sunlight reflected from the solar radiation sensor or other external solar radiation may interfere with the driver's visibility in the forward direction. In particular, in an environment where visibility is poor such as at night, a solar radiation sensor reflected on a windshield hinders driving, which is a problem.

Further, since the exterior cover is transparent, the internal structure of the photodetector, wiring, and the like becomes completely visible, which impairs aesthetic appearance and is undesirable in appearance.

[Purpose of the invention]

Therefore, in order to solve the above problem, the internal structure of the solar radiation sensor is not visible from the outside, the image of the solar radiation sensor is reflected on the windshield, the sunlight reflected by the solar radiation sensor or other external incident light causes SUMMARY OF THE INVENTION It is an object of the present invention to provide a solar radiation sensor that does not interfere with the visual recognition of the front of a vehicle.

[Means for solving the problem]

In order to solve the above problems, the solar radiation sensor of the present invention is:
The light-receiving part of the light-transmitting cover that covers the photodetector made of single-crystal silicon is made of a material that blocks wavelengths below 600 nanometers (nm), and the surface of the light-transmitting cover has a rough surface to scatter incident light. It is characterized by the following.

[Action]

According to the solar radiation sensor of the present invention, the light transmitting cover that covers the light detecting element that detects sunlight is made of a material that blocks a wavelength of 600 nm or less, and its light receiving portion surface is processed into a rough surface. The sunlight sensor looks dark to human eyes,
Unlike the conventional case, the solar radiation sensor does not reflect on the windshield, and the sunlight or other external incident light reflected on the solar radiation sensor does not interfere with the driver's visual recognition in front. Moreover, the internal structure of the solar radiation sensor is not visible from the outside.

In addition, by covering the surface of the light transmitting cover with a transparent resin, refraction of incident light can be suppressed, light can be effectively taken into the inside, and scratch resistance of the surface can be improved.

〔Example〕

An embodiment according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a dashboard D in a vehicle interior when the solar radiation sensor S is used.
3 shows a state in which it is inserted into and attached to the cylindrical holder 3 on the upper surface of FIG.

The solar radiation sensor S includes an integrally formed light transmitting cover 1,
The outer shape is constituted by the bottom plate 2 provided continuously to this. The light transmitting cover 1 includes a cylindrical upper body 1a that receives sunlight and a box-shaped lower body 1b that houses a circuit board.
The upper cylindrical part 1a is a hemispherical cylinder at the upper end. The cylindrical upper part 1a is inserted into the holder 3 from the lower surface side, and only the hemispherical part is exposed to the outside.

A flange 3a is formed on the upper surface of the holder 3, and is positioned in the circumferential direction by being inserted into the opening of the dashboard D. That is, a convex portion described later is formed on the side surface 3b of the holder 3, and the opening of the dashboard D is formed according to the outer shape of the holder 3, so that the holder 3 has no flexibility in the circumferential direction. . The side face 3b is provided with substantially L-shaped grooves at two places, and the projections 1c, 1c formed at two places on the outer periphery of the cylindrical body 1a are fitted into the grooves. The circumferential direction of the solar radiation sensor S is positioned. Further, the solar radiation sensor S is urged downward by the spring 4 attached to the lower end of the cylindrical body 1a and compressed between the lower surface of the dashboard D and the solar radiation sensor S, and the holder 3 and the solar radiation sensor S Is more firmly fixed to the dashboard D.

In the figure, W is a windshield, the solar radiation sensor S receives sunlight through the glass, a photodetector element described later generates an electromotive force, and data processing is performed by this output.

FIG. 2 is a partial sectional view showing the internal structure of the solar radiation sensor S, and is a sectional view taken along the line II-II in FIG.

The light transmitting cover 1 accommodates a three-dimensional molded board 6 on which the light detection element 5 is mounted, a circuit board 10 to which the board is connected, and connector pins 11 to which the circuit board 10 is connected. The signal from the connector pin 11 is input to a control device (not shown), and based on this information, adjusts the air blowing temperature and also controls the air volume for each air outlet provided in the vehicle interior.

The light transmitting cover 1 is formed by injection molding of a polycarbonate mixed with a dye in order to prevent light having a wavelength of about 600 nm or less including visible light from reaching the light detecting element 5 and to provide heat resistance. In this example, anthraquinone violet, anthraquinone green and a heterocyclic dye yellow were used as dyes at 0.035% by weight, 0.035% by weight, and 0.04% by weight, respectively, based on a colorless and transparent polycarbonate.
Molded with 5% by weight.

In addition, the hemispherical surface of the cylindrical body 1a that covers the light detecting element 5 and is exposed to the outside is roughened to scatter incident light in order to improve the anti-glare property of the driver. ing. In other words, the surface is subjected to graining to give irregularities of about several tens of μm, and further, to prevent refraction of incident light on this surface, for the purpose of effectively taking in light and improving the scratch resistance of the surface, It is covered with a transparent silicon resin or the like having a thickness of about 5 to 10 μm. Here, the thickness of the hemisphere is about 1.5 mm. Further, in order to suppress the refraction of the incident light and to improve the moisture resistance and vibration resistance in the cylindrical upper body 1a, a transparent silicon resin 12 is sealed inside the hemisphere.

The light transmitting cover 1 is made of approximately 12
You may shape | mold with the super heat resistant acrylic which can be used even at 0 degreeC. In addition, since the color of the light transmitting cover 1 is used in accordance with the color of the dashboard, the combination of the dyes may be appropriately changed.

The three-dimensional molded substrate 6 is formed by integrally molding a liquid crystal polymer (wholly aromatic polyester) having solder heat resistance by injection molding and forming a wiring pattern 7 by electroless plating. The three-dimensional molded substrate 6 is a substantially cubic substrate head 6a on which the light detecting element 5 is mounted, a substrate body 6b on which the thermistor chip 8 and the like are mounted, and the output of each of these elements is led to the circuit board 10. And a substrate foot 6c.

Here, the photodetecting element 5 uses a single crystal silicon solar cell having a size of about 6 mm × 6 mm square and about 0.4 mm thickness, and is mounted on each surface of the substrate head 6 a, that is, on five surfaces excluding the bottom surface. Further, the thermistor chip 8 is connected in parallel to each of the light detecting elements 5 and corrects the output temperature characteristics of each of the light detecting elements 5. A wiring pattern is formed up to the tip 6d of the board foot 6c, and this portion is soldered to the circuit board 10 so that the output of each element is input to the circuit board 10. The light detection element 5 is fixed to the substrate head 6a with cream solder and an ultraviolet curable adhesive, and is fired in a heat treatment furnace.

The circuit board 10 is a glass epoxy resin double-sided board,
A connector pin 11 plated with two layers of phosphor bronze / Cu, Sn is directly mounted on the circuit board 10, and a receptacle connector is formed by attaching a bottom plate 2 made of polycarbonate.

Next, the operation of the present embodiment will be described. FIG. 3 shows the relationship between the wavelength of light passing through the light transmitting cover 1 and the radiation spectrum intensity (relative value). As is apparent from FIG. 3, the light transmitting cover 1 has a filter characteristic for sharply blocking light having a wavelength of 600 nm or less including visible light.

Further, since a single-crystal silicon solar cell is used as the light detecting element 5, its spectral sensitivity characteristics are as shown in FIG. As is apparent from FIGS. 3 and 4, the light transmitting cover 1 looks dark to human eyes, and the inside of the light transmitting cover 1 cannot be seen. Moreover, when a single-crystal silicon solar cell is used as the photodetecting element 5, more than two-thirds of light that contributes to the power generation of the solar cell can be used even if light with a wavelength of 700 nm or less is blocked, and it is sufficient as a solar radiation sensor. Can function.

[Effect of the invention]

As described above, the solar radiation sensor of the present invention covers the photodetector with the light-transmitting cover that transmits light having a wavelength longer than visible light. The driver can safely and reliably see the front of the driver without any reflection of the solar radiation sensor, and even if the visibility of the driver is poor, such as at night, the reflection of the solar radiation sensor is the same as before. There is no hindrance.

In addition, since the internal structure of the solar radiation sensor such as the light detection element and wiring is not visible, the appearance of the solar radiation sensor is not impaired. The anti-glare property can be further improved.

[Brief description of the drawings]

1 to 4 are views for explaining an embodiment according to the present invention. FIG. 1 is a partial cross-sectional view showing a state in which a solar radiation sensor is attached to a dashboard, and FIG. First
3 is a diagram showing the relationship between the radiation spectrum intensity and the wavelength of sunlight passing through the light transmitting cover, and FIG. 4 is a diagram showing the relationship between the spectral sensitivity and the wavelength of the photodetector. It is a figure showing a relation. 1 ... light transmitting cover, 3 ... holder, 4 ... spring, 5 ...
... photodetector, 6 ... three-dimensional molded board, 10 ... circuit board,
D: Dashboard, S: Solar radiation sensor.

 ──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-298828 (JP, A) JP-A-1-142821 (JP, U) JP-B 62-31287 (JP, B2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A light transmitting cover for covering a photodetector made of single-crystal silicon is made of a material that blocks a wavelength of 600 nm or less, and the surface of the light transmitting cover has a rough surface to scatter incident light. An insolation sensor characterized in that: