JP2001180445A - Method of inspecting severance of orthogonal filament provided at heating filament for defogging glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discriminate the severance of orthogonal filaments provided orthogonally to a plurality of heating filaments in defogging glass frequently used for a vehicle window. SOLUTION: In this method of inspecting the severance of orthogonal filaments provided at defogging glass heating filaments formed in a pattern by connecting conductive filaments formed of one or plural orthogonal filaments, orthogonally to a plurality of horizontal heating filaments provided almost horizontally on a glass plate face, a current is applied between the vicinity of an intersection point on the horizontal heating filament intersecting the upper end of the orthogonal filament, and the vicinity of an intersection point on the horizontal heating filament intersecting the lower end of the orthogonal filament, and a current flowing in the orthogonal filament is detected by a current detecting sensor. When the current value is the reference value or less, the orthogonal filament is judged as severed. Only the presence of severance of the orthogonal filament is thus judged, and a position into which the current detecting sensor is brought close on the orthogonal filament is preferably set between two heating filaments near the nearly middle part on the orthogonal filament.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for judging the presence or absence of a break in an orthogonal line provided so as to be orthogonal to a plurality of heating lines in an anti-fog glass frequently used for a vehicle window or the like.

[0002]

2. Description of the Related Art Conventionally, as a method for detecting the presence / absence of a break in a heating line provided substantially horizontally for anti-fog, a method has been proposed in which all of a plurality of heating lines for anti-fog are connected to a bus bar. However, the method based on the presence or absence of continuity cannot confirm the presence / absence of disconnection. For this reason, various inspection methods have been devised and proposed.

[0003] For example, Japanese Patent Application Laid-Open No.
No. 249905 discloses that, in order to inspect the presence or absence of disconnection and the position of disconnection in the anti-fog glass on which the conductive heating filaments are formed in a pattern, the conductive heating filaments are energized. A scanning head that captures the electromagnetic energy generated by the sensor, and a wire position detection sensor that emits a detection signal when the detection head is on the wire. The position detection signal is input to the control unit via the storage unit of the computer, the output of the detection head is adjusted in advance and compared with a stored slice level (threshold) to count the number of energized filaments. Disclosed is a method and an apparatus for inspecting breakage in anti-fog glass, which determine the presence or absence of breakage and display it by comparing the number of solid lines detected by a line position detection sensor.

[0004]

The above-mentioned proposed technique is reliable and extremely effective in determining the presence or absence of a break in an anti-fog glass having a heating line arranged in a substantially horizontal direction.

[0005] However, in order to detect the disconnection of at least one or more orthogonal filaments orthogonal to each of the anti-fogging heating filaments arranged in the substantially horizontal direction, it is necessary to detect the presence of conductive heating provided in the substantially horizontal direction. Even if current is applied to the filament, no current flows in the orthogonal filament because each section of the orthogonal filament divided by each heating filament has the same potential. For this reason, even if the detection sensor that detects the current is brought close to each section separated by the horizontal heating line of the orthogonal line, the current output cannot be obtained, so the presence or absence of disconnection cannot be automatically determined, and visual inspection is performed. I had to rely on.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and at least one orthogonal wire orthogonal to each of the anti-fogging heating wires arranged in a substantially horizontal direction is surely disconnected. It is an object of the present invention to provide a method for inspecting the breakage of an orthogonal line provided in a heating line for anti-fog glass, the presence or absence of which can be determined.

That is, the present invention provides a plurality of horizontal heating wires provided on a glass plate surface in a substantially horizontal direction, and a conductive wire comprising one or a plurality of orthogonal wires on the plurality of horizontal heating wires. Are connected orthogonally, and in the method of inspecting the breakage of the orthogonal line provided in the heating line for the patterned anti-fog glass, near the intersection on the horizontal heating line intersecting the upper end of the orthogonal line, A current is supplied to the vicinity of the intersection on the horizontal heating wire crossing the lower end of the orthogonal wire, and the current flowing through the orthogonal wire is detected by a current detection sensor. When the current value is equal to or less than the reference value, the wire is disconnected. This is a method for inspecting the breakage of the orthogonal line provided in the heating line for the anti-fog glass, which detects only the presence or absence of the line break in the orthogonal line.

The present invention also relates to the above-described heating method for an anti-fog glass, wherein a position on the orthogonal wire near the current detecting sensor is set between two heating wires near a substantially middle portion on the orthogonal wire. This is a method for inspecting the breakage of an orthogonal line provided on a line.

Alternatively, according to the present invention, the current is supplied to one or a plurality of the orthogonal filaments, and the current detection sensors are brought into close proximity to each other at each section of the orthogonal filaments divided by the horizontal filaments. When the value of the current flowing in the section of the orthogonal filaments is equal to or less than the reference value, as a disconnection, the presence or absence of the disconnection of the orthogonal filaments and the position of the orthogonal filaments provided in the heating wire for the anti-fog glass which are also detected. This is a disconnection inspection method.

[0010] Alternatively, the present invention provides a method according to the present invention, wherein the one or more orthogonal filaments are energized, and the orthogonal filaments are separated from each other by horizontal lines along the orthogonal filaments. Measure the current flowing by the moving current detection sensor,
This is a method for inspecting the breakage of an orthogonal wire provided on a heating wire for anti-fog glass, which detects the presence or absence and the position of the wire break in synchronization with the position signal of each horizontal wire.

Alternatively, the present invention provides a method for detecting a current flowing in an orthogonal wire by using a magnetic induction coil or a Hall element as the current detecting sensor. This is an inspection method for wire breakage.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 4, the heating filament 3 ₁ for defogging a plurality of substantially horizontally to the rear window glass sheet 1, 3 _2, the · · 3 _n provided for a motor vehicle, the orthogonal filament 4 consisting of one or a plurality among the horizontal heater strips of the plurality several horizontal heater strips 3 _1, 3 _2, and arranged perpendicular to the · · 3 _n, in a substantially horizontal direction conductive heater strips of a plurality of provided 3 _1, 3 _2, ·
・ A pair of busbars 5 and 5 are provided at both ends of 3 _n ,
These were patterned.

Further, the orthogonal filament 4 is
, 3n are provided at positions so as to divide the heating wires 3 ₁ , 3 ₂ ,... 3 _n substantially equally.

The present invention is a method for inspecting the presence or absence of a break in the orthogonal wire 4 provided orthogonally to the heating wire 3 ₁ , 3 ₂ ,... 3 _n for such anti-fog glass 1. As shown in FIG. 1, a horizontal heating wire 3 intersecting the upper end of the orthogonal wire 4
_A DC power supply or an AC power supply is connected between the vicinity of the intersection a on 1 and the vicinity of the intersection b on the horizontal heating wire 3 _n intersecting with the lower end of the orthogonal wire 4, and the orthogonal wire 4 is energized; The current detection sensor 7 is brought close to a desired point c on the orthogonal line 4 to measure a current flowing through the point c.

Assuming that the current flowing through the orthogonal line 4 when there is no disconnection is 100%, when the measured value of the current flowing at a desired point c of the orthogonal line is below a certain slice level, the orthogonal line 4 is disconnected. Is determined to be present.

The position of the current detecting sensor 7 on the orthogonal line 4 when the current detecting sensor 7 is approached by only one position may be any position, but is divided by two horizontal heating lines 3 near the center of the orthogonal line 4. Assuming that the point c on the orthogonal line 4 is the current change rate when there is a disconnection somewhere between the orthogonal lines separated by the heating lines, the current change rate is large when there is a disconnection and when there is no disconnection. This is most preferable because the difference between the current values increases and the reliability of the determination increases.

When there are a plurality of the orthogonal filaments 4, one of the orthogonal filaments 4 may be energized.

FIG. 4 shows a plurality of heating wires 3 in a substantially horizontal direction.
_1, 3 _2, for example, only one orthogonal filament 4 which is perpendicular to the · · 3 _n shows an example in which the center portion.

In this case, at the upper end a and the lower end b of the orthogonal filament 4
The equivalent circuit when the DC power supply E is connected is as shown in FIG.
And each heating filament 3₁, 3_Two, ... 3_nAnd orthogonal line 4
Of the left and right halves of each heating wire from the intersection of
The resistance is represented by R, and each heating filament 3 ₁, 3_Two, ... 3_nSeparated by
The resistance of the orthogonal wire 4 is₁, R_Two, R_nIn table
It was done.

The number of heating filaments is usually about 14 to 20 in many cases, but is not limited to this because it varies depending on the size of the glass plate and the like.

[0021] When now the number of heater strips for example 16, by an equivalent circuit, the heater strips 3 _1, 3 _2, ... 3 ₁₆
Table 1 shows the results of simulating the values of the currents flowing through the resistances of the orthogonal filaments 4 divided by r ₁ , r ₂ ,..., R ₁₅ .

[0022]

[Table 1]

The vertical heading shows each heating line 3₁, 3_Two, ... 3
₁₆Resistance r of the orthogonal filament 4 in the section partitioned by₁, R_Two,
..R_FifteenRepresents the current flowing through the
Heating wire 3₁, 3_Two, ... 3₁₆Orthogonal line of the section partitioned by
Each part of the article₁, R_Two, R _FifteenThat the disconnection has occurred
Represents.

[0024] Now, if brought close to the current detection sensor 7 on the orthogonal striatum r ₁ partitioned by the heater strips 3 ₁ and 3 _2, r ₁ part of orthogonal filament 4, r ₂ parts, ... when there is a disconnection in any one place of the r ₁₅ parts, 0% when the respective partial normal without disconnection, 39%, ... 93%, ... 3
A current of 7% flows, and its range is 0 to 93%. Therefore, when installing the current detecting sensor 7 to the position on the orthogonal filament r ₁ partitioned by the heating filament 3 ₁ and 3 ₂ is the slice level may be 93% to 99%, In consideration of safety, an intermediate value is set to, for example, 96%, and when it is 96% or less, it may be determined that there is a disconnection.

The eighth and ninth heating filaments 3 from the top
₈And 3₉Orthogonal stripes r₈Current detection sensor on top
Are close to each other, r₁Part, r_Twopart,·
・ R ₈Part, r_FifteenDisconnection in one of the parts
Then, each of the parts has a normal 17 with no disconnection.
%, 31%,... 0%,.
Its range is 0-40%. Therefore, the current detection sensor
When placing the sir 7 in this position, the slice level
Should be higher than 40%, but in anticipation of safety
For example, it is 70%, and when it is 70% or less, it is determined that there is a disconnection.
I do.

As described above, detection conditions differ depending on the position where the current detection sensor 7 is brought close to the sensor. However, it is most accurate to bring the sensor close to an orthogonal wire near the middle of the orthogonal wire 4 described later. Can be detected.

The above Table 1 was obtained by simulation based on the equivalent circuit of FIG. 5, and it was confirmed that a result almost coincident with the actually measured one was obtained.

As the current detection sensor 7, various known sensors can be used. For example, a current using the magnetic induction coil or the Hall element is used to detect the current flowing in the orthogonal wire 4. When the power supply E for inspection is a DC power supply, a sensor to which a Hall element is applied may be used, and when an AC power supply, a sensor to which a Hall element or a magnetic induction coil is applied may be used.

Since the lengths of the heating filaments and the orthogonal filaments vary depending on the rear window glass for a vehicle, a slice level or the like as a reference for the presence or absence of disconnection may be appropriately adjusted.

A plurality of heating wires 3 ₁ provided in the horizontal direction,
3 _2, ... 3 if orthogonal to _n streak 4 is a plurality of, for example 3
In this case, the current flowing through all the orthogonal filaments may be detected. However, if only the presence or absence of disconnection is obtained, only the current flowing through the orthogonal filament 4 located at the center of the three wires is detected. If the detection and measurement are performed, the location of the disconnection cannot be determined, but the presence or absence of the disconnection can be detected from the current change rate.

FIG. 2 shows another embodiment of the present invention.
One of the one or more orthogonal filaments 4, 4,...
One of by energizing the orthogonal filament 4, orthogonal each horizontal heater strips 3 ₁ striatal 4, 3 _2, respectively, each of the sections partitioned by ... 3 _n current detection sensor 7 and 7, is brought close to ... When the current flowing in each section of the orthogonal line 4 is equal to or lower than the reference slice level, it is of course possible to determine that there is a break in any of the orthogonal lines 4. The portion where the value of the current flowing through each of the portions 4 becomes zero can be detected as the disconnection position.

In this case, a plurality of heating filaments 3 ₁ , 3 ₂ ,.
3 _{If the} current flowing in each part of the orthogonal filament 4 divided by _n is small, the part is not a disconnection, but another part, that is, the part of the orthogonal filament 4 where the current becomes zero, is a disconnection. become.

FIG. 3 shows still another embodiment of the present invention. The one or a plurality of orthogonal striatum 4,4, by energizing the one orthogonal filament 4 of the ..., the orthogonal filament 4 is the horizontal strip 3 ₁ along the orthogonal filament 4, 3 _2, scan with a current detection sensor 7 moving along the immediately above on the orthogonal filament 4 for each section partitioned by · · 3 _n the orthogonal umbilical 4 heads 1
4 by measurement of the current flowing in quadrature striatum 4, so as to detect the presence or absence and the position of disconnection of the horizontal strip 3 _1, 3 _2, orthogonal filament 4 in synchronization with the position signal · · 3 _n Things.

A horizontal rod 12 provided so as to cross a central portion of a substantially rectangular frame 11 is provided with a plurality of heating lines 3 of the anti-fog glass plate 1 placed at a predetermined position in the frame 11. ₁ , 3 ₂ ,..., 3 _n are provided above and parallel to the orthogonal filament 4.

The horizontal rod 12 is provided with a rail (not shown), and the scanning head 14 is provided so as to run on the rail.
Is screwed with a ball screw 13 provided directly above the orthogonal filament 4 and provided in parallel with the horizontal rod 12, and the rotation of the driving motor 15 rotates the ball screw 13 so that the scanning head 14 can travel. .

The current detection sensor (not shown) is provided below the scanning head 14. The scanning head 14 is arranged so as to run right above the orthogonal line 4, and the current detection sensor is moved up and down by raising and lowering the lifting cylinder 17. It can be close to the filament 4.

A synchronous tag 16 corresponding to the position of each of the heating wires 3 ₁ , 3 ₂ ,... 3 _n is attached to a synchronous tag attaching member 18 provided in parallel with the horizontal rod 12. The head 14 detects the tag 16 and confirms the position of each heating wire 3, so that the timing of the current detection sensor is lowered, and the head 14 travels on the orthogonal wire 4.

In the case of the method of the present invention, the position where the current flowing through the orthogonal filament detected by the current detection sensor becomes zero may be determined as the disconnection position.

According to this method, it is possible to grasp not only the presence / absence of disconnection but also the disconnection position information simply by moving one current detection sensor, which is useful for preventing the recurrence of a defect.

If the obtained information is input to a computer or the like, it can be used as management information.

The plurality of heating wires 3 ₁ , 3 ₂ ,.
· 3 _n also works effectively as an antenna function as well antifogging function, a plurality of heater strips 3 provided in particular horizontally
_1, 3 _2, at least 1 provided to be orthogonal to the · · 3 _n
With the addition of the orthogonal wires 4 or more, the high-frequency waves received by the anti-fog heating wires 3 ₁ , 3 ₂ ,... 3 _n and the orthogonal wires 4 are heated by the heating wires 3 ₁ , 3 ₂ ,. 3 _n antenna wire 2,2 close to the 're-emitted into, or because it is transmitted by electromagnetic electrostatically bonded, the antenna line 2, 2' can improve the reception gain of, provided in the horizontal direction heating filament 3 _1, 3 _2, orthogonal filament 4 provided to be orthogonal to the · · 3 _n
Thereby, the reception gain of the antenna line can be further improved.

The antenna wires 2, 2 'are connected to a receiver (not shown) via feeding points 6, 6'.

[0043]

According to the present invention, it is possible to efficiently inspect the disconnection inspection of the orthogonal wire provided so as to be orthogonal to the plurality of heating wires for the anti-fog glass, which has been conventionally performed by visual inspection. Productivity has been improved, and automation and labor saving have become possible.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of a disconnection inspection method according to the present invention.

FIG. 2 is a plan view illustrating another embodiment of the disconnection inspection method of the present invention.

3A and 3B are a schematic plan view and a schematic side view, respectively, illustrating still another embodiment of the disconnection inspection method of the present invention.

FIG. 4 is a plan view exemplifying a rear window glass of an automobile having at least one orthogonal line orthogonal to a heating line for anti-fog.

FIG. 5 is an equivalent circuit when an orthogonal wire provided on a heating wire for anti-fog glass and a power supply for disconnection inspection are connected.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Glass plate 2, 2 'Antenna wire 3, 3 _{1-3 n} Heating wire 4 Orthogonal wire 5 Bus bar 6, 6' Feeding point 7 Detection sensor 8 Inspection power supply 10 Scanning means 11 Mount 12 Horizontal rod 13 Ball screw 14 Scan Head 15 Drive motor 16 Synchronous tag 17 Elevating cylinder

Claims (5)

[Claims] 1. A method in which a plurality of horizontal heating filaments provided in a substantially horizontal direction on a glass plate surface and a conductive wire comprising one or a plurality of orthogonal filaments are orthogonal to the plurality of horizontal heating filaments. Connected, in the method of inspecting the disconnection of the orthogonal line provided in the heating line for the patterned anti-fog glass, near the intersection on the horizontal heating line intersecting the upper end of the orthogonal line, the orthogonal line The current is passed through the vicinity of the intersection on the horizontal heating wire crossing the lower end, and the current flowing through the orthogonal wire is detected by a current detection sensor. A method for inspecting the breakage of an orthogonal wire provided on a heating wire for anti-fog glass, wherein only the presence or absence of a wire break is detected. 2. The prevention device according to claim 1, wherein a position on the orthogonal wire where the current detection sensor approaches is set between two heating wires near a substantially middle portion on the orthogonal wire. A method for inspecting the breakage of orthogonal wires provided on the heating wire for frosted glass. 3. An electric current is supplied to the one or more orthogonal filaments, and a current detection sensor is brought close to each of the sections divided by each horizontal filament of the orthogonal filaments. When the current value flowing in the section is equal to or less than the reference value as a disconnection, the presence or absence of the disconnection of the orthogonal line and its position are also detected, and the orthogonal line provided in the heating line for the anti-fog glass Disconnection inspection method. 4. A current detection sensor that energizes the one or more orthogonal filaments and moves on the orthogonal filaments at intervals where the orthogonal filaments are separated by the horizontal filaments along the orthogonal filaments. The current flowing through is measured, and the presence / absence of the break of the orthogonal wire and its position are detected in synchronization with the position signal of each horizontal wire, and the orthogonal wire provided on the heating wire for anti-fog glass is characterized in that Inspection method of strip. 5. The protection according to claim 1, wherein a current flowing in the orthogonal wire is detected by using a magnetic induction coil or a Hall element as the current detection sensor. A method for inspecting the breakage of orthogonal wires provided on the heating wire for frosted glass.