JPS5847673A - Window glass specifications discriminator for car - Google Patents

Abstract

PURPOSE:To optically discriminate the specifications of a window glass by using the fact that the optical absorption characteristics of tempered glass and sandwich glass are different. CONSTITUTION:When a car 2 with the front window glass 1 is sent to the specified position of the car assembly line that is a part of production processes, a light source 3 is operated automatically. The first and second lights with specifically different wavelengths, for example, 2.3mum and 1.6mum lights are radiated on the front window glass 1 sequentially and the radiated lights are received by a light receiving device 4 that is installed in the car 2. The light receiving device 4 consists of a lens 4a that collects the light passing through the glass 1 and a semiconductor light receiving element 4b that receives the collected light. The signal from the light receiving device 4 is processed by an A/D converter 5, first and second latch circuits 5 and 6 and division device 8. When the front glass 1 is made of sandwich glass, the output P of a comparator 9 is set to ''1'' and when it is made of tempered glass, the output is set to ''0''. As a result, the specifications of the glass 1 can be discriminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle window glass specification determination device.

For example, the front windshield of a car is made of laminated glass, which is made by sandwiching a transparent vinyl film (polyvinyl butyral) between two pieces of glass and heat-bonding it into a shape, and by heating ordinary plate glass and then quenching it in the atmosphere. In Japan, it is compulsory to install tempered glass, and in some export countries, laminated glass is required. Therefore, on the automobile assembly line, the front panel is manufactured with specifications that match the destination of the automobile. It is necessary to inspect whether the windshield is installed on the vehicle.

Therefore, conventionally, the glass manufacturer printed a certification mark in white on one corner of the front windshield, consisting of letters and symbols indicating the details of the glass specifications, and an inspector visually determined the specifications. They were checking to see if it matched the destination of the car.

However, with this conventional method, not only is it cumbersome for the inspector to have to memorize all the letters and symbols on the certification mark, but also the certification mark is very small, making it difficult to see and causing a risk of misreading. However, there was a problem with the infallibility of the test.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a vehicle window glass specification determination device that can eliminate all such problems.

That is, the device for determining the specifications of a vehicle window glass according to the present invention attempts to optically determine the specifications of a windshield by utilizing the difference in light absorption (or transmission) characteristics between tempered glass and laminated glass. be.

However, if the specifications of the window glass were simply determined by irradiating the window glass with light of a specific wavelength and its transmittance, there is a high risk of misjudgment due to interference factors such as ambient light or dirt on the glass. Therefore, in the vehicle windshield specification discriminating device according to the present invention, two types of light of specific different wavelengths are transmitted through the windshield installed on the vehicle flowing on the assembly line, The main feature is to determine the specifications of the window glass based on the ratio or difference between the

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, and first with reference to FIG. 1, light transmission characteristics of laminated glass and tempered glass used as front window glass will be described.

In the figure, the curve (■) shows the wavelength characteristics of laminated glass, and the curve @ shows the wavelength characteristics of tempered glass.

Comparing both lines, there is a noticeable difference in the transmittance of light at wavelengths 2.3 and 2.3 between laminated glass and tempered glass.

In other words, the transmittance of tempered glass is 87% (absorption rate 13
%), the transmittance of laminated glass is 4% (absorption rate 96
%).

The low transmittance of this laminated glass at 2.3 μm is mainly due to the light absorption characteristics of polyvinyl butyral, which forms the entire interlayer film.

Therefore, in principle, the specifications of the windshield can be determined by irradiating the windshield with light having a wavelength of 2.3 μm and examining its transmittance.

However, in reality, light may be attenuated due to dirt on the front windshield, ambient light, dust in the air, or deterioration of the light source, and the difference in transmittance of light with a wavelength of 2.3 μm alone is not sufficient to distinguish between laminated glass and laminated glass. It may not be possible to distinguish it from tempered glass.

Therefore, for example, the difference in transmittance between curves ■ and @ is 1.6.
Light of μm (combined gun 22% 9%) and light of 2.3 μm with a large difference in transmittance are irradiated alternately, and the ratio or difference in transmittance is determined.

In this way, the ratio or difference in transmittance will not be affected by the various factors mentioned above, so that the specification of the front windshield can be correctly determined based on this in any environment.

Next, an embodiment of the present invention will be described with reference to FIG. 2 and subsequent figures.

In FIG. 2, when a vehicle 2 with a front windshield 1 fully installed comes to a predetermined position on a vehicle assembly line that is part of the production process, a light source 3 is automatically activated to emit light of a specific different wavelength, e.g. The first and second lights are 3 μm and 1.6 μm.
The light is sequentially irradiated onto the front windshield 1, and the irradiated light is received by a light receiver 4 installed inside the vehicle 2.

For example, as shown in FIG. 6, the light source 3 includes a tungsten lamp 6a, a lens 3b, a first filter 6C that allows only the first light of 2.3 μm to pass, and a first filter 6C that allows only the second light of 1.6 μm to pass through. A disk 6 having a second filter 3d
e, and by rotating this disk 6e, the first and second filters 6c. 3d'! The rotating device 6f is configured to set the light flux from the tungsten lamp 6a output through the lens 6b.

The light receiver 4 also includes a lens 4a that collects the first and second lights passing through the front windshield 1, and a semiconductor light receiving element 4b that receives the light and sound collected by the lens 4a.
It is composed of.

The positional relationship between the light source 3 and the light receiver 4 may be different from the example shown in FIG. It may be installed outside.

A signal processing circuit that processes all the signals from the light receiver 4 is configured as shown in FIG. 4, for example.

That is, the voltage signal Ql is output from the light receiving element 4b of the light receiver 4 according to the intensity of the first and second lights.

A/D converter 5 that converts a2 into a digital signal;
/Digital signal tz output from the D converter 5, b2
All first. The first filter generated in synchronization with the selection of the second filters 3c and 3d. Second latch signal Ll.

1st Lunch by L2. Second launch circuit 6.7
And the first. Divide one of the digital signals bl and b2 latched by the second latch circuit 5.6 by the other (for example!
'; j b2/bt ), the division result C of the divider 8, and a predetermined reference value ref (for example, b 2 /b l corresponding to laminated glass and b' 2 corresponding to tempered glass). /b” t is b z /b * > b
Since '2/b'□, r'e f = b i/b
'+ -t >b'z/b'4. Here, ε is an arbitrary constant, and this ε is determined so as to satisfy the above condition. ), and only when C>ref, the output P is
It consists of a digital comparator 9 as a specification discriminator.

In this way, if the front windshield 1 attached to the vehicle 2 is a laminated glass, the output P of the comparator 9 will be ゝゝ1''.
9 If it is tempered glass, it will be ゝゝ0.

As shown in FIG.ゝゝ0'') Check whether they match, and if it is P-Q, the OK clamp lights up, and if it is P-Q, it is NG.
By turning on the lamp and sounding the NG buzzer, it is possible to automatically determine whether or not the front windshield 1 is suitable.

Note that the same determination result can be obtained by subtracting one of the digital signals b□ and b2 from the other (for example, b2-bl) using a subtracter instead of the divider 8 in FIG. 4.

In addition, in FIG. 4, the A/D converter 5 is omitted, and the first. If the second latch circuits 6 and 7 are respectively replaced with sample and hold circuits, and further analog types are used as the divider 8 and the comparator 9, the voltage signal a1. a2 f: It is also possible to perform all analog processing.

Furthermore, in the above embodiment, an example was described in which light of 2.3 μm and 1.6 μm was used, but the invention is not limited to this. It is possible to determine the specifications of the front windshield.

Furthermore, although the above embodiment describes the front windshield of a vehicle, the present invention can also determine the specifications of rear windshields, door glasses, etc. in exactly the same way.

As described above, by using the device for determining specifications of vehicle windshields according to the present invention, inspectors do not have to visually check the certification mark that is printed in white on one corner of the glass glass. Misreading and remembering errors are eliminated, making it possible to perform all tests accurately.Also, testing can be automated, which improves testing efficiency.

[Brief explanation of drawings]

FIG. 1 is a light transmission characteristic diagram of laminated glass and tempered glass, and FIGS. 2 to 5 each show an embodiment of the present invention.
Fig. 2 is an explanatory diagram showing the arrangement relationship of the light source, front windshield, and light receiver, Fig. 6 is a configuration diagram showing a specific example of the light source and light receiver, Fig. 4 is a block diagram of the signal processing circuit, and Fig. 5 is a block diagram of the signal processing circuit. The figure is a flowchart illustrating an example of determining the suitability of a front windshield. 1...Front windshield 2...Vehicle 6.
...Light source 4...Receiver 8...Divider (
Arithmetic unit) 9... Comparator (specification discriminator) Fig. 1 1, i ft Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A first wave of a specific wavelength is applied to each windshield installed on a vehicle passing through an assembly line. a light source that emits second light; a light receiver that receives the first and second light emitted from the light source through the window glass; and a first and second light that is received from the light receiver. The first light is output according to the intensity of the second light.
．． Consisting of an arithmetic unit that divides one of the second signals by the other or subtracts one from the other, and a specification discriminator that determines the specifications of the window glass based on the calculation result of this arithmetic unit. f: Features: Vehicle window glass specification determination device.