JPH101027A - Windshield for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heat a heated object efficiently so as to improve transmittance of a transparent part by shielding lower part heater wires and part of upper heater wires by means of a ceramic coating layer, arranging the rest of the upper heater wires on the outside of the coating layer, and connecting most of vertical wires to the upper heater wires from a bus bar on the other side. SOLUTION: After a ceramic coating layer 2 is formed on the recessed face side of a vehicle exterior side plate glass 1, a plurality of lower heater wires 31 and side heater wires 32 are arranged on the ceramic coating layer 2 in the lower side part and in the side part, while part of the upper heater wires 3, is arranged on the outside of the coating layer 2. In the end parts on one sides of the rest of the upper heater wires 33 and the lower heater wires 31 wide feeding parLs 41 , 42 , 43 are arranged. To the other end parts of the lower heater wires 31 , a bus bar 5 is connected, while vertical wires 6 are connected to the bus bar 5. As a result, connecting work is facilitated as the feeding parts are arranged in one place, while a generating heat quantity can be used without any loss as the length of the upper heater wires can be selected properly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a windowpane provided with a heater for melting snow and ice to prevent a wiper from operating due to snow or ice adhering to a windowpane of an automobile.

[0002]

2. Description of the Related Art Conventionally, USP No. 410 having such a heater wire provided on a rear window glass with one heater wire branched from a bus bar for preventing a wiper from freezing.
No. 9133, multiple heater wires are provided on the front window glass,
JP-A-55-136639 in which a heat ray absorbing layer is provided in the plane of a heater and a wiper, a plurality of heater wires are provided in a front window glass, and a heat stress reducing portion is provided near a glass edge outside the heater wire. JP-A-3-
No. 281461 has been proposed.

Further, Japanese Utility Model Laid-Open No. 60-3150 has been proposed in which a bus bar is not provided, and a heater wire having a total length increased by a plurality of turns is provided. In addition, a plurality of heater wires connected to a power supply unit at one end of the plurality of heater wires are provided, and a bus bar connecting the other end connects to another power supply unit disposed close to the one power supply unit. Japanese Patent Application Laid-Open No. 4-87182 has been proposed in which a plurality of heater wires are provided.

[0004]

SUMMARY OF THE INVENTION However, USP
No. 4109133 has a single heater wire for melting snow and ice, and there is also a single heater of Japanese Utility Model No. 60-3150, and it cannot generate a sufficient amount of heat for melting snow and melting ice. Also, JP-A-55-136639 and JP-A-3-2814.
The heater of No. 61 can generate enough heat,
Since it is necessary to supply power to both sides of the plurality of heater wires, the connection work may be difficult, and since it is necessary to perform the connection work at least in another place, it is inevitable that the workability deteriorates. .

Further, the heater disclosed in Japanese Patent Application Laid-Open No. 4-87182 improves workability, but since all heater wires are disposed so as to be accommodated in a predetermined ceramic coating layer, the heater must be connected to the outside. Unless the width of the ceramic coating layer that cannot be seen through is wider than the existing width, there is a disadvantage that a sufficient amount of heat cannot be obtained.

[0006] The present invention has been made in view of the above points, and efficiently heats an object to be heated without waste, improves workability, and increases the transmittance of transparent portions other than the ceramic coating layer. It is an object of the present invention to provide a front window glass for a vehicle, which is provided with a heater filament.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an opaque ceramic coating layer is formed on a peripheral portion of a front window glass for a vehicle, and at least a lower portion of the peripheral portion is formed on the peripheral portion. A plurality of lower heater wires are arranged, connected to a bus bar at both ends, one bus bar is used as one power supply portion, and a plurality of vertical filaments are formed from the other bus bar having a predetermined width in the horizontal direction. In a window glass for a vehicle having an upper heater wire folded back to the other power supply portion disposed close to one of the power supply portions, the lower heater wire and a part of the upper heater wire are separated from the outside of the vehicle by the ceramic coating layer. The heater wires are concealed so that they cannot be seen through, and the remaining heater wires of the upper heater wires are arranged at positions protruding from the ceramic coating layer, and most of the vertical filaments are located from the other bus bar. A plurality of upper heater wires extending directly upward at intervals and connected to the upper heater wire, and a plurality of upper heater wires protruding from the ceramic coating layer are also arranged at a predetermined interval. It is preferable that the power supply units are arranged so as to be concealed by the ceramic coating layer near the lower side of the arc formed by the lower limit operation range of the wiper. In this case as well, the upper heater is connected to these power supply units. It is necessary that the connection be made by vertical streaks which are separated for a predetermined period.

The interval between the vertical filaments and the interval between the plurality of upper heater wires protruding from the ceramic coating layer are as follows:
When the transmittance of the transparent portion of the window glass is T (%), and the transmittance of the upper heater wire and the vertical wire itself is 0, the vertical wire and the upper heater wire that protrude from the ceramic coating layer are disposed. It is preferable to set the average transmittance at an arbitrary 20 mm square in the region to be 70% or more.

[0009] In order to make the transmittance of the upper heater wire and the vertical streaks protruding from the opaque ceramic coating layer 70% or more, the transmittance of the transparent portion of the window glass is T (%).
Assuming that the transmittance of the upper heater wire and the vertical wire itself is 0, the average value of the transmittance at an arbitrary 20 mm square where the upper heater wire and the vertical wire are arranged may be 70% or more. When the width of the upper heater wire and the vertical filament is w (mm) and the total length thereof is 1 (mm), 400 mm
² is the total area, in which wl is the area of the opaque portion of the heater wire and the vertical line, and (400-wl) mm ² is the area of the transparent portion.

Since the visible light transmittance of the transparent portion is T,
The product T × (400−wl) of the area of this part and T is the product of the total area and the desired transmittance of 70%, 400 × 70 (= 2800)
If it is equal to or larger than 0), the transmittance of this portion can be substantially 70% or more. Therefore, the line width and length of the heater line and the vertical line can be determined from this inequality, and the length is determined. The distance (pitch) between the lines can be determined.

That is, the widths of the upper heater line and the vertical line in the portion protruding from the ceramic coating layer are all set to w (mm).
Where T (%) is the transmittance of the transparent portion, p _{1 is} the distance between the vertical filaments and p ₂ is the distance between the upper heater filaments, and p ₁ + p ₂ ≧ (28000-400T + 80wT-2w ²
P1 and p2 may be determined so as to satisfy the relationship of T) / (wT).
In this case, we want the horizon to act as a heater,
p ₂ is small, it is sufficient so p ₁ increases. Note that both p ₁ and p ₂ are distances between line centers.

[0012] Further, the power supply unit arranged in close proximity may be determined by other facilities of the automobile, and the like.
Although it cannot be set freely, since this portion is not a heating region, as shown in the embodiment, if disposed so as to be concealed by the ceramic coating layer near the lower side of the arc formed by the lower limit operating range of the wiper, the efficiency is improved Snow melting and ice melting can be performed well, which is preferable.

In this case as well, the vertical stripes protrude from the ceramic coating layer and exist in the visible region, but are separated from each other by a predetermined distance and have an average transmittance of 70% or more, similarly to the vertical stripes from the other bus bar. There is a need.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A black opaque ceramic coating layer is formed on the entire periphery of a vehicle front window glass by printing a ceramic paste so that unnecessary objects are not seen from outside or inside. You. If the width of the ceramic coating layer is too wide, visibility is impaired, so the lower side portion is 60 mm to 120 mm, and the side side portion is 20 mm to 40 m.
m.

The ceramic coating layer is formed on the concave side of the outdoor glass sheet of the laminated glass, but may be formed on the concave side of the indoor glass sheet. The heater wire is formed by printing and baking a conductive paste such as a silver paste on the concave side or at least the lower side of the concave side of the vehicle interior plate glass at a position corresponding to the stationary position of the wiper. It is always concealed and arranged inside the ceramic coating layer so that it cannot be seen through.

Also, as shown in the embodiment, a plurality of heater wires are connected to the periphery of one side of the wiper operating range in order to melt snow and ice which are attracted to the side and hinder visibility. May be formed by printing and baking.

The lower heater wire disposed on the lower side has a line width of 0.5 mm to 4 m within a range concealed by the ceramic coating layer.
m and a range of 4 to 8 wires are provided at least 0.5 mm apart over the resting length of the wiper. Further, one end has a bus bar as a terminal and the other end has a bus bar. The paste is printed and fired to form a wide width.

Although it depends on the position where the wiper is attached, it is difficult to arrange the upper heater wire so that it can be completely hidden by the ceramic coating layer. The portion concealed by the ceramic coating layer can reduce the distance between the wires like the lower heater wire, and when the wiper is attached to this portion, it is necessary to reduce the line width or the distance between the lines. . For the upper heater wire protruding from the ceramic coating layer, it is necessary to set a line width, a distance between the lines, and the like so as to secure a transmittance of 70%.

With respect to the transmittance of the portion where the upper heater wire and the vertical wire protrude from the ceramic coating layer, the vertical wire is concealed by the horizontal ceramic wire from the other bus bar by the horizontal wire, If only the upper heater wire protrudes from the ceramic coating layer, it is relatively easy to increase the transmittance, for example, to 70% or more, with a certain interval. However, in this case, the vertical line must be hidden by the side ceramic coating layer, and the heater line (horizontal line) extending to the side ceramic coating layer and returning further becomes longer by several tens of millimeters, so that the resistance increases and the lower heater line increases. Not only does the current flowing through the strip decrease and the amount of generated heat becomes insufficient, but also heat is wasted more than the length of the wiper.

The inventors of the present invention have made the present invention based on such knowledge, and have found that the transmittance can be increased to, for example, 70% or more even when a vertical streak is provided in a transparent portion. It is.

That is, the transmittance of the portion protruding from the ceramic coating layer is determined by the cross-sectional area of the light beam of the light receiver of the visible light transmittance test specified in 3.3 of JIS standard R3212.
This is to determine whether or not a desired transmittance can be obtained in this arbitrary square of 20 mm square with reference to the square of 0 mm square. In order to achieve the transmittance of 70% or more, a vertical line and an upper heater (horizontal line) are required. As shown in FIG. 4 (a sample of the portion indicated by the arrow in FIG. 2), the state where the long horizontal line and the long vertical line form two side edges is the most linear state. Since the total length becomes longer and the transmittance becomes the lowest as a result, the condition for setting the transmittance to 70% or more in this state may be obtained. Assuming that the ratio is T (%), the interval between the vertical filaments is p ₁ , and the interval between the upper heater filament (horizontal filament) and the upper heater filament (horizontal filament) is p ₂ , Inverted L formed by long horizontal streaks
The length of the character shape is 20 mm + (20−w) mm = (40−
w) mm, the area S ₁ of the inverted L-shape is w × (40−
w), and the length of the inverted L-shape formed by the short vertical line and the short horizontal line is (20−p ₁ ) mm + ｛(2
0−p ₂ ) −w｝ mm = (40−p ₁ −p ₂ −w) mm,
The area S ₂ of this inverted L-shape is (40−p ₁ −p ₂ −w) w
Since the area S _T of the transparent portion 400- (S ₁ +
S _2), ie, _{400- (80-p 1 -p 2} -2w) w
Becomes

Here, the transmittance and the area of the transparent portion are 20 mm.
If the transmittance of the entire corner is 70% or more and the area (400 mm ² ) or more, the transmittance of the entire 20 mm square is substantially 70% or more.

From the above relationship, p ₁ + p ₂ ≧ (28000−400T + 80wT−2w ²
The inequality T) / (wT) can be derived, and if p ₁ and p ₂ are set so as to satisfy this relationship, the portion with the lowest transmittance can be made 70% or more.

When p ₁ = p ₂ = p, p ≧ (14000 + 40wT−200T−W ² T) /
(WT).

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment in which the glass of the present invention is mounted as a front window glass for a vehicle. FIGS. 2 and 3 are partially detailed views showing the vicinity of the other bus bar in FIG. 1 and one bus bar, respectively. Partial detailed view near the power supply unit, FIG.
FIG. 3 is a diagram in which the arrow portion in FIG. 2 is sampled as a square of 20 mm square.

Example 1 As shown in FIGS. 1 to 3, the outer side glass sheet 1 to be mounted on a front window glass for a vehicle, on the concave side (laminated surface side) of the outer side glass sheet 1 before being bent, extends over the entire circumference. ceramic paste printing, forming a ceramic coating layer 2, dried, lower portion and a plurality of lower heaters striated 3 ₁ and the side heater filament 3 ₂ part upper on the lateral side portion of the ceramic coating layer the heater wire 3 _3, the portion protruding from the ceramic coating layer 2, the remainder of the upper heater wire 3 _3, wide power feeder 4 ₁ to one end of the lower heater filament (positive feeding unit), 4 ₂ (Negative power supply), 4 ₃ (positive power supply) and vertical wire 6 ′, the other end of the lower heater wire has a wide bus bar 5 and a vertical wire 6 connected to this bus bar. Each conductive paste is printed and connected to the ceramic coating layer during bending. Simultaneously firing the like printed heater wire by paste.

On the other hand, a cutout portion 7 is formed in a part of the interior glass plate (at a position corresponding to the power supply portion). The inner glass sheet 1 and the outer glass sheet 1 'thus obtained.
Is temporarily press-bonded through an intermediate film such as polyvinyl butyral, and then subjected to a normal lamination process in an autoclave to form a laminated glass as a front window glass of a vehicle. Is applied to the vehicle body from the negative side power supply unit and grounded.

[0028] In the above configuration, the ceramic the line width of the lower heater wire 3 ₁ 2 mm, number six, the distance between the centers of the heater filament between the (pitch) 3 mm, in the upper heater wire 3 ₃ The line width of the heater wire concealed by the coating layer is 1 m
m, number of wires, distance between wires 3 mm, upper heater wire 3
0.8mm line width of heater wire protruding from the ceramic coating layer among _3, three the number, 11 mm distance (pitch) p ₂ between lines centers, 0.8mm line width of vertical strip, the number three, the distance between the line centers of vertical strip (pitch) p ₁ is taken as 20 mm, -20 ° C. Upon application of a DC power supply
It was confirmed that when the wiper portion frozen under the above environment was heated for approximately 5 minutes, current could be sufficiently melted.

Further, about 72 and the average transmittance at 20mm angle of lowest permeability portion of the portion where the upper heater wire and vertical strip shown in FIG. 4 intersect is a S _T · _T / 400
%, And practically 70% or more, and the other portions could obtain a transmittance higher than 72%.

[0030]

According to the present invention, the front window glass provided with the heater wire for snow melting and ice melting can be easily connected because the power supply portion is provided in one place, and the ceramic coating is provided. In addition to making the average transmittance in the visible region where the heater wires and the like protrude from the layer not less than 70%, there is no need to cover the upper heater wires with the ceramic coating layer, and the length can be made to be an appropriate length. Can be effectively used without waste.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment in which the glass of the present invention is mounted as a front window glass for a vehicle.

FIG. 2 is a partially detailed view of the vicinity of the other bus bar in FIG.

FIG. 3 is a partially detailed view showing the vicinity of a power supply unit in FIG. 1;

FIG. 4 is a diagram in which the arrow portion in FIG. 2 is sampled as a square of 20 mm square.

[Explanation of symbols]

1,1 'flat glass 2 ceramic coating layer 3 ₁ lower heater wire 3 ₂ side heater wire 3 ₃ upper heater wire 4 _1, 4 ₃ positive feeding portion 4 _second negative-side power supply portion 5 busbars 6,6' vertical strip

Claims (4)

[Claims] An opaque ceramic coating layer is formed on a peripheral portion of a front window glass for a vehicle, and a plurality of lower heater wires are disposed on at least a lower side of the peripheral portion, and bus bars are provided at both ends. , One bus bar as one power supply,
A vehicle window glass having an upper heater wire that is folded back from the other bus bar having a predetermined width in the lateral direction to the other power supply unit disposed close to the one power supply unit through a plurality of vertical stripes, The lower heater wires and some upper heater wires are concealed by the ceramic coating layer, and among the upper heater wires, the remaining heater wires are arranged at positions protruding from the ceramic coating layer, and Most of them extend directly upward at a predetermined interval from the other bus bar and are connected to an upper heater wire, and a plurality of upper heater wires protruding from the ceramic coating layer are also arranged at a predetermined interval. Front window glass for vehicles. 2. A power supply unit disposed in close proximity to a lower side of a circular arc formed by a lower limit operation range of a wiper is concealed by a ceramic coating layer, and an upper heater is connected to these power supply units. 2. The front window glass for a vehicle according to claim 1, wherein the connection is made by vertical lines separated for a predetermined time. 3. The interval between the vertical filaments and the interval between the plurality of upper heater wires protruding from the ceramic coating layer are such that the transmittance of the transparent portion of the window glass is T (%) and the transmittance of the upper heater filament is 0. In this case, the average transmissivity at an arbitrary 20 mm square in the region where the vertical filament protruding from the ceramic coating layer and the upper heater filament are disposed is set to be 70% or more. A front window glass for a vehicle according to claim 1 or 2, wherein the front window glass is for a vehicle. 4. The line widths of the upper heater line and the vertical line in the portion protruding from the ceramic coating layer are all set to w (mm), the transmittance of the transparent portion is T (%), the interval between the vertical lines and the vertical lines. the p _1, the distance between the upper heater filament and the upper heater filament is taken as _{p 2, p 1 + p 2} ≧ (28000-400T + 80wT-2w 2
T) / (wT) the relationship front window glass for a vehicle of claim 1, wherein it has to set the p ₁ and p ₂ to satisfy.