JPS5948241A - Sensor for light volume - Google Patents

Abstract

PURPOSE:To improve the durability of a sensor for light volume, by applying a surface hardening agent containing an ultraviolet-absorbing agent onto a sensor light receiving section. CONSTITUTION:In a light volume sensor 3 used for an automatic lighting apparatus for a head light, a surface of a plastic having a haze of 50-95% is provided with a light receiving window on which a surface hardening agent containing an ultraviolet-absorbing agent is applied. Thus, a sensor for light volume that is durable and high in reliability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a light amount sensor, particularly a light amount sensor for measuring the amount of external light used in an automatic headlight lighting device that automatically turns on the headlights of a vehicle when the amount of external light decreases. Regarding.

Conventionally, the light amount sensor used in the automatic headlamp lighting device is
As shown in the figure, it was provided on the upper surface of an instrument panel 2 of an automobile 1. This light amount sensor 3 uses cadmium sulfide OdS or a phototransistor in its main body, and detects only the amount of external light. It is arranged in a directional manner in the direction of the windshield 4, and the instrument panel is oriented to remove dust, etc.
il was placed. However, because a single tree makes the instrument panel narrower, cars are the first in the world to have a corner or 17i + ui.
1st festival passing under the bridge, If(iya(Kidanbu 10)
Detecting the light intensity in the ii↑ part of F 1111 at 1 high [headlights, +, 4; 1 light difference? There was a problem with L-L.

This invention was made with 71 points between these jrr: :4, t:
i5 11-1) By providing 5 plastic light-receiving windows, the purpose is to resolve the 131 points between the i(ill devices) by 111 points.

The receiver t. Plus Deck's hazy song 4/I5 11~ as tN in January
The reason why Mr. Hayes set it at 95 yen was because of the expansion of 5 (less than 1%) Y;119.

The effect is not sufficient, and the above-mentioned '7. In addition, the total light transmittance is reduced due to yellowing of plastic due to sunlight, especially ultraviolet rays, or scratches caused by removing insects to remove adhering dust, resulting in the above-mentioned problems.

Hereinafter, the present invention will be explained with reference to the drawings.

Example 1 FIG. 2 shows how the sight sensor of this embodiment is installed.

First, to explain the configuration, the instrument panel 2 is
A core material 5 extending over the entire width of the crawler, a relatively hard plastic skin material 6 covering its upper surface, and a pad 7 following it.
The main part is composed of the wire harness 8 on the four parts of the core material 5, and the air duct attached to the core material 5 with a bracket 0) 1
0 etc. are stepped, and there are also several instruments not shown. 3 is a light speed sensor. The main body 11 of the sight sensor is made of a ring-shaped urethane foam inserted between the skin material 6 and the main body 11, with a protrusion 12 protruding from its lower surface inserted into a hole 18 made in the core material 5 for positioning. A cushion material 1 supports j:rimoto i, Icl 1. The main body 11 has conventional quantities (, Fe1 is not shown, but outputs of OdS and OdS),! : 114 value and comparison; when the amount of external light decreases, a signal instructing to turn on lights such as headlights is issued in comparison 1. If, l, 'C, the signal instructing to turn on is A wire 15 connects the wire 15 to a switching circuit (see 1) via a wire harness 8. 16 is a light receiving window of the It sensor of the present invention. The structure is a square board with four legs 114a to 16d.
(160, LED not shown) protrudes, legs 16a~
If) L-7:I·1 is set so that the opening edge of the skin material 6 is sandwiched between the hook portion of d and the plate portion. Next, the method for manufacturing the light receiving window will be explained. First, light-diffusing Tsukijin Ribolicarbonate (Panlight; Teijin Hisei Co., Ltd. + LHL trade name) was used as a starting material, and a polycarbonate primer (Tosguard 51O: Toshiba Silicone Co., Ltd.) was applied to the surface of the light-diffusing Ribolicarbonate (Panlight; Teijin Hisei Co., Ltd. + LHL product name).
Furthermore, an organosilane thread surface hardening agent containing an ultraviolet absorber (manufactured by Tosgard Toshiba Silicone Co., Ltd., product name) was applied thereon. The polycarbonate used contained a light diffusing material made of fine particles such as alumina, and had a light transmittance of 70 inches and a haze value (haze value of 80 inches).

The method of applying the surface hardening agent is to clean the molded body made by injection molding in a solvent using an ultrasonic cleaner, then spray a primer, and after spraying the surface hardening agent on the heat, 120° Baked at C for 1 hour.

A light quantity sensor equipped with such a light-receiving window was incorporated into an automatic headlamp lighting device of a passenger car, and the vehicle was driven to investigate erroneous lighting when passing over a pedestrian crossing, etc. In place of a pedestrian crossing bridge, height 5m
, Check the false lighting when passing through a tunnel-like structure with a width of 4 m and a length of LoTrL during the daytime, Betaka, 25 η per hour, 35
km/h, '45' m/h (7) No false lighting occurred at either speed.

In addition, 1600 p of silicon carbide particles were placed on the surface of the light receiving window of the light amount sensor of the present invention from a height of 61.5 cm to 25097 m1.
When dropped at a flow rate of n, the haze value increased by 7.2 inches. However, judging from the increase of 55.8% in polycarbonate (without surface hardening treatment), the scratch resistance has been significantly improved, and even if the light receiving window surface is wiped with a cloth during cleaning, it will not scratch. However, when fzJ<<, the haze value does not change, and the durability as a light) 11 sensor is improved.

In general, the JrJ resin of polycarbonate q3 yellows due to sunlight, but since Shitaro IiH is absorbed by the surface hardening film, yellowing is prevented. This also improves the durability of the sensor as a light amount sensor.

Example 2 Haze f+Ili Fl 4. Same as Example 1 described above.
, o % polycarbonate was used to create a light-receiving center. For comparison, the haze value is 42.8%, 211
．． A light receiving window was created in the same manner as in Example 1 using two types of 11% polycarbonate. I-People Same light intensity sensor body and combination-1 as in Example 1, do the same! I! .

We incorporated it into the automatic headlight lighting system of a commercial vehicle and conducted a test to prevent false lighting.

As a result, in the case of the light receiving window of this example, it turned on to 2571Vh185, and the light did not turn on at each speed of 45 cars, or the haze value was 42. s % is 2 ry kn/h, 20.0
17) Mono +; t 25 Ivh, 35' /h
, 4.5'@! //11 (1) It turned on even if it was not.

From the above, it can be seen that erroneous lighting occurs when the haze value is less than 50 inches.

Regarding the material of the light receiving window, it is not limited to polycarbonate, but also acrylic, vinyl chloride, polysal 7on, AB.
S, As resin, polyamide resin, polyester, etc. are used, and as a surface hardening agent, as an organosilane paint, KP-800, X-12 manufactured by Shin-Etsu Chemical Co., Ltd.
-t121, S-114= manufactured by Kijin Kasei Co., Ltd., 5) IC-1000 manufactured by General Electric Company, USA,
MR-8 manufactured by Mitsubishi Gas Chemical Co., Ltd., AR (3-631'l manufactured by Dow Corning, USA), Fuji Hard manufactured by Geni Kasei Co., Ltd. as a multifunctional acrylic paint, Acrylite and Dialite manufactured by Mitsubishi Rayon Co., Ltd. As the melamine paint, MR-4000 manufactured by Mitsubishi Gas Chemical Co., Ltd., etc. can be used.

In addition, for polycarbonate, for each of the organosilane, polyfunctional acrylic, and melamine paints, apply Fuji 17 layer of organosilane paint and apply from 'C'.
It is preferable to apply the polyfunctional acrylic type (B, 1) as is.

As I have explained above, according to this 9th Ming, the purchase of the automatic headlight turning on Minato G, February 1) Y, 11
In 1 sensor, the UV absorption on the plastic surface of 1-5% (1-! + 5%) + / )
The I'll structure is equipped with a light-receiving core coated with a surface hardening agent.
14) The effect can be obtained by using an optical sensor with j<L.

[Brief explanation of the drawing]

FIG. 1 is a partial explanatory diagram of an automobile instrument, and FIG. 2 is a cross-sectional explanatory diagram showing an optical I11 sensor and how it is installed. 1... Own ms, 2-... Instrument panel; 3... Light ejection sensor, 11... 7-inch A knee, 16... Light receiving window.

Claims (1)

[Claims] L Turn on the vehicle's headlights when the amount of external light decreases! I7
In a sensor that detects the amount of external light used in an automatic headlamp lighting device that turns on automatically, a plastic light-receiving window with a heat resistance value of 50 to 95 inches is coated with a surface hardening agent containing an ultraviolet absorber on the light-receiving part. A light amount sensor equipped with a