JPS6027845A - Inspecting apparatus for laminated glass - Google Patents

Abstract

PURPOSE:To make available quantitative determination of performance of removal of air from an inter-pane space of a laminated glass, installing a sensor for obtaining an image signal corresponding to a penetrated light quantity of the laminated glass per a plurarity of parallel scanning line assumed on the surface of the laminated glass. CONSTITUTION:A detecting part of inspection apparatus is composed of light source 5 installed on the rear side of the laminated glass 3 and line sensor 6 attached with an objective lens located on the front surface side, the light penetration quantity is detected in a form of an image signal by the sensor 6 per scanning line normal to travel direction of the laminated glass. Further, an output of line sensor 6 is given by a signal processing part 7 and converted to a digital value here. Thus, remaining condition of air bubbles in the predetermined range of the laminated glass can be judged and consequently, the result of inspection and quality of the laminated glass can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an inspection device for laminated glass (laminated glass) such as automobile windshields, and in particular measures the amount of air bubbles remaining in the intermediate layer during the temporary adhesion process to check the state of temporary adhesion. The present invention relates to a device for determining quality.

2. Description of the Related Art Generally, so-called safety glass, which is made by laminating a plurality of glass sheets together with a synthetic resin such as polyvinyl butyral interposed therebetween, is generally used for the windshield of an automobile. This type of laminated glass is made by heating the stacked glass plates to form the desired shape, then separating them into individual glass plates, inserting an adhesive interlayer between the plates, and laminating and bonding them again. Manufactured by

Since fine powder such as diatoms is interposed between the heated and bent glass plates so that they can be easily separated, cleaning is required to remove the fine powder stuck to the bonding surface of the glass before inserting the adhesive film. Work is done.

When multiple glass plates that have been cleaned are preheated with an adhesive interlayer in between and temporarily pressed together with a press roll, they no longer look like ground glass and their transmittance increases. Temporary pressure bonding is performed to expel air, moisture, residual steam, etc. from the intermediate layer, but if this process is incomplete, air bubbles may remain in the laminated glass that is completed by final pressure bonding in an autoclave. It may be a defective product.

Therefore, in the past, a sensory comparison test (visual inspection based on a limit sample) was conducted to check the crushed state of the interlayer film embossing during the temporary pressure bonding process, and the quality of the laminated glass after the temporary pressure bonding was judged based on the remaining amount of the frosted glass-like white opaque area. Judgment and sorting (ranking) was performed. However, such visual inspection requires an inspector, is difficult to standardize quantitatively, and has individual differences, so reliable and stable inspection cannot be expected.

In view of this problem, the present invention provides an inspection device that can quantitatively grasp the degree of air removal in the intermediate layer of laminated glass, improves the accuracy of managing the temporary bonding state, and contributes to improving the yield and quality of laminated glass. The purpose is to

The inspection device for laminated glass according to the present invention is equipped with a sensor that obtains a video signal corresponding to the amount of light transmitted through the laminated glass for each of a large number of parallel scanning lines assumed on the surface of the laminated glass. The video signal is converted into a digital signal corresponding to the level of each divided hint, and the state of bubbles remaining in the intermediate layer of the two laminated glass is determined. With this configuration, it is possible to relatively easily and accurately determine whether the temporary crimping state is good or bad.

The present invention will be explained below based on examples.

FIG. 1 is a schematic system diagram showing an embodiment of a laminated glass inspection apparatus according to the present invention. This inspection device is installed on the discharge side of the temporary pressure bonding press rolls (1) and (2), and the laminated glass (3) after the temporary pressure bonding is transferred to the conveyor roll (
4), while being transported to the next final crimping step, the inspection device checks whether the temporary crimping condition is good or not. The detection part of the inspection device consists of a light source (5) installed on the back side of the laminated glass (3) and a line sensor (6) equipped with an objective lens installed on the front side, and detects the progress of the laminated glass (3). The amount of transmitted light is detected in the form of a video signal by a line sensor (6) for each scanning line perpendicular to the direction. The line sensor (6) with this objective lens is C
It may be a one-dimensional (line) solid-state imaging device such as a CD type or MOSFET type. Note that a two-dimensional (plane) solid-state image pickup device or image pickup tube can also be used.

The output of the line sensor (6) is given to a signal processing section (7), where it is converted into a digital value.

Also, Jf is attached to the drive motor (8) of the hair roll (4).
The output PC of the pulse generator (9) that has been generated is given to the signal processing section (7), and the position of the laminated glass (3) is detected based on this output PG.

The output of the signal processing section (7) is given to a data processor (10) provided with a CPUt, and the temporary press-bonding state of the laminated glass (3) is determined according to a data processing procedure described later. The determination results are recorded by a printer (11), and an alarm (12) is activated for defective products.

FIG. 2 is a schematic block diagram similar to FIG. 1 showing another example of the detection section. In this example, the light source is a laser (13
) is used. The laser beam (14) emitted from the laser (13) is transmitted to the polygonal rotating mirror (15).
As the mirror (15) rotates, the surface of the laminated glass (3) is scanned by the laser beam (14). A light receiver (16) is arranged along the laser scanning line on the back side of the laminated glass (3).
The laser beam (14) transmitted through the laser beam (14) is sent to the receiver (16).
) at one end of the photomultiplier (17).

Therefore, from the output end of the photomultiplier (17), the amount of light transmitted through the laminated glass (3) is converted into a video signal along the scanning line and is output as in FIG.

FIG. 3 is a more specific block diagram of the signal processing unit (7) and data processor (10) in FIGS. 1 and 2, and the data processor (10) is mainly a CPU.
(19), ROM (20), RAM (21) and data bus (22). Further, the signal processing unit (7) converts the video signal output from the line sensor (6) in Figure 1 or the photomultiplier (17) in Figure 2 to a digital signal by converting it to a predetermined quantization level. A/D converter (23) and pulse generator (9)
) for calculating the horizontal position of the laminated glass (3). A/D
The outputs of the converter (23) and PG counter (24) are sent to the CPU (19) via the input interface (25). The video signal obtained for each scanning line of the laminated glass (3)l has a waveform as shown in FIG. 4A (a), for example. In other words, the level of the video signal is high in the parts of the laminated glass (3) where the amount of transmitted light is large, but in the parts where air bubbles remain in the intermediate layer, the amount of transmitted light is small because it is like ground glass. Le is small.

Along with this video signal, the bit clock shown in FIG. 4A (b) is applied to the A/D converter (23).

This bit clock is, for example, a shift clock when a COD camera is used as the line sensor (6) in FIG.
bits are given. In addition, when a laser beam (14) and a photomultiplier (17) are used as shown in Fig. 2, the bit clock is a polygonal prism-shaped rotating mirror (15).
This is a clock generated in accordance with the rotation of the . Note that the bit clock is also sent from the interface (25) to the CPU (19) in order to determine the memory address.

In the A/D converter (23), the video signal is sliced at a predetermined slice level (Le, Ls, etc. in FIG. 4A) and converted into a 1'' or 0'' (1 bit) digital signal. This digital signal is sampled every bit clock, temporarily stored in the RAM (21), and then processed in the CPU (19) according to a predetermined procedure. Note that when the video signal level is higher than the slice level, the sampling data is "1", which indicates that the temporary crimping is in good condition. On the other hand, when the video signal level is lower than the slice level, the sampling data becomes "0", which indicates that there are residual bubbles.

FIG. 5 is a flowchart showing a data processing procedure for determining the temporary press-bonding state of the laminated glass (3). As shown in FIG. 5, when it is detected that the laminated glass (3) has come into the scanning area of the detection unit based on the output of the PG counter (24), a digital signal corresponding to the video signal is generated for each scanning line. The import starts. When 1947 minutes of data is captured, edges of the laminated glass (3) are detected based on that data. As shown in FIG. 4A (a), the edge is located at the position Eg1 where the level first drops sharply from both ends of the video signal (starting point and ending point of the scanning line). 'Egλ, and for a digital signal obtained by slicing a video signal at a predetermined slice level Ls, the position where "0" first appears from the start and end of one line signal is Recognized. This edge position is taken into the CPU (19) in the form of address information formed based on the hit clock.

Next, based on the edge information, the laminated glass (
3) separation (boundary determination) between the edge portion E and the center portion C is performed. Edge part E is an area 25++n (dotted line in Figure 6) from the edge of the laminated glass (3), and if temporary adhesion is poor in this area, it will cause oil immersion and submergence during the main adhesion process in the autoclave. Therefore, the criteria for judgment are stricter than for central part C. Area separation is performed using line sensors (
By calculating in advance how many NM on the glass surface 1 bit of the output of step 6) is, and making the part corresponding to the number of bits 25 inches from the edge the edge part E, and the inside part the center part C. It will be done. For example, line sensor (6
), and if the resolution of the line sensor is 2048 bits/line, it is possible to determine an area 25n from the edge with 1 fl/hint.

Next, for each separated area, the digital value of each bit on one scanning line (line) is stored in the RAM (
21). In the edge part E, Fig. 4A (a
) is stored at the upper slice level Le, and at the center C, the data at the lower slice level Ls is stored.
The data in is stored. The higher the slice level, the stricter the criteria. Note that the A/D converter (
23), slicing (quantization) for two levels Les Ls is performed at the same time, but this is different from general A.
This is the same process as 2-bit quantization in /D conversion, and for example, Ls and below correspond to 00'', Ls=Le to O1'', and Le and above to 0 and above correspond to IO.

Data at slice level Le is “10”-・“1”
"," (lI "00"→"0" is obtained by encoding, and the slice level Ls
The data in is 10"Ol"→"1゛,"00"
- Obtained by encorching to "0".

When data acquisition for one scanning line is completed, data acquisition for the next scanning line is performed, and the PG counter (24)
Based on the output of +t!, the glass covered the scanning area by 1 m! Data acquisition is performed one after another for all lines until the line is determined. Once the entire surface of the glass has been scanned, the quality of the temporary press-bonding state is then determined based on the memory contents.

For example, IE or not is determined based on what percentage of the total number of bits the number of bits equal to or higher than the slice level Ls is present in the central portion C. A similar determination is also made regarding the edge portion E. Judgment criteria (%) can be determined based on sample tests. If laminated glass that does not meet the criteria is found, an alarm signal is output to the alarm (12) or display shown in FIG. 3.

As shown in the enlarged view of the video signal in Figure 3B, the slice levels are set, for example, levels L1 to L4 corresponding to the class, and the level of the video signal for each bit is determined by the digital signal (this level). If the number of bits is 3 bits), the level at which the number of bits reaches a reference % or more with respect to the total number of bits is checked, and the grade of the temporary crimped state may be determined based on that level. The grading results are recorded by a printer (11).

Slice level LS% Le or 4th slice level in FIG. 4B(a)
The slice levels L and -L in FIG. B are arbitrarily set by the input setter (26) in FIG. This input setting device (
26) may be a digital switch or key fodder.

In the above embodiment, the judgment is made by comparing the total number of bits to the number of bits having a digital value exceeding a predetermined reference level for the entire surface of the laminated glass (3). The ratio may be compared to the number of bits having a digital value of 1 bel or less as a reference. Furthermore, the temporary crimping state may be determined by determining the ratio of the total number of bits to the number of bits having a digital value above or below a predetermined reference level for each scanning line. In this case, it is possible to accurately determine localized temporary crimping defects. Further, in this case, if there is no scanning line on the entire surface of the laminated glass (3) that is determined to be defective in crimping, it is determined to be a good product. Alternatively, the grade may be determined for each scanning line based on the slice levels L1 to L4 corresponding to the grade as shown in FIG. 4B. In this case, the average value for the entire glass surface of the grade determined for each scanning line can be taken as the grade of the individual laminated glass.

In order to improve the accuracy of judgment regarding the curved surface of the laminated glass (3), a pair of inclined conveyors (28
) (29) may be used.

As described above, the present invention obtains a video signal along the scanning line on the surface of laminated glass, converts it into a digital signal,
The residual state of air bubbles in the intermediate layer of the laminated glass is determined easily by the ratio of the number of bits having a digital value on one side of a predetermined reference level to the total number of bits in a predetermined area of the laminated glass. Using a suitable device, it is possible to quantitatively determine the degree of air removal from the interlayer of laminated glass. Therefore, the control accuracy of the temporary press-bonding state is improved, and the yield and quality of laminated glass can be improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram of a temporary crimping state inspection device in the temporary crimping process of an automobile windshield, which shows one embodiment of the present invention, and Fig. 2 shows another example of the detection system shown in Fig. 1. 3 is a detailed block diagram of the signal processing unit and data processor in FIGS. 1 and 2, and FIG. 4A (a) is a schematic system diagram similar to that shown in FIGS. Figure 4A (b) is a waveform diagram of the pit crotch of the detection system, Figure 4B is a partially enlarged diagram of the video signal showing a modification of the slice level, and Figure 5 is a temporary bonding of laminated glass. FIG. 6 is a plan view of the laminated glass, and FIG. 7 is a schematic system diagram showing a modification of the detection system. In addition, in the symbols used in the drawings, (1) ---
---Press roll (2) ------Press roll (3) ------Laminated glass (4)----
-------Conhair roll (5) ----------Light source (6) ----------Licensor (7) -------- Signal processing section (8) ------- --One drive motor (9) ---Pulse generator (10
) --- Data processor (11) ---1.
- Printer (12) - Alarm (13) - Laser (14) - Laser beam (15) -
--1111--To polygonal prism rotating mirror (16)---
-1---Photo receiver 5 (17)---Photo multiplier. Agent Katsutsune Ueya Yoshio Toshiki Sugiura 6 Figure 3 Figure 4A Figure 4B Figure 5 To "', i Start 77"/PS? NO E-5 The engineering/society number appears ηll Las is YES Pass the scan or JO η Laskeine Edge burial bud processing section τ 6 antis and pass/fail dividing area sewing doo j 1 foot edge 4F, ψFemale Furt ゛ At Shu's one line of mockery [c... Ridobu ζ' deaf and West Write in memory Figure 6 J l

Claims (1)

[Claims] A sensor that obtains a video signal corresponding to the amount of light transmitted through the laminated glass for each of the many parallel scanning lines assumed on the surface of the laminated glass, and a sensor that adjusts the level of the video signal for each bit divided into many parts along each scanning line. and a signal converter for obtaining a corresponding digital signal, the air bubbles in the intermediate layer of the laminated glass at a ratio of the number of bits having a digital value on one side of a predetermined reference level to the total number of bits for a predetermined area of the laminated glass. A laminated glass inspection device configured to determine the residual state.