JP6302173B2 - Glass with defogger - Google Patents

Description

  The present invention relates to a glass with a defogger.

  With the spread of car navigation systems that allow viewing of terrestrial digital TV broadcasts, television antennas, particularly TV antennas for receiving terrestrial digital TV broadcast waves, should face the desired wave direction on the rear glass of vehicles such as automobiles. There is a demand for performance that controls directivity, suppresses interference of unwanted waves from directions other than the desired wave direction, and improves the image quality of the television. In particular, during high-speed traveling, reception performance is degraded due to Doppler shift, so it is considered necessary that the reception gain difference (also referred to as FB ratio) between the desired wave and the unwanted wave be 10 dB or more.

  On the other hand, a defogger, an AM / FM antenna, and the like are conventionally provided on the rear glass of a vehicle for the purpose of deicing, defrosting, and antifogging. In the case of providing the above-mentioned television antenna in a glass plate provided with such a defogger or an AM / FM antenna, it is necessary to dispose the defogger and the antenna on a glass plate having a limited area. In some cases, the antenna becomes too close, and the antenna, particularly the television antenna, is affected by the heat generated by the heat rays that constitute the defogger, making it difficult to control the directivity of the television antenna in the desired wave direction. This is because the directivity of the television antenna changes from the horizontal direction to the zenith direction due to the influence of heat generated by the heat rays, and the sensitivity in the horizontal direction decreases.

  Under such circumstances, various methods for devising the heat ray pattern have been proposed in order to reduce the influence of heat generated by the heat ray and improve the directivity of the television antenna in the desired wave direction (for example, Patent Documents). 1 and 2). In these patent documents, an attempt is made to form a heat generation distribution that suppresses local abnormal heat generation by providing a thin line portion having a thin line width in the heat ray pattern and a thick line portion having a line width wider than the thin line portion. ing. In addition, it is also described that in order to form such a heat generation distribution, a part of the heat ray adjacent to the antenna is formed into a meander shape, and the line width of the meander-shaped portion is increased. The thin line portion, the thick line portion, or the meander-shaped portion has a line width of about 6.5 mm, 7.7 mm, and 15.5 mm in Patent Document 1, assuming that the thin line portion is 1 mm. The line width of the thick line portion is 3 to 4 mm, and the line width of the meander-shaped portion is 1 to 4 mm.

However, when the thin line portion and the thick line portion are provided as proposed in these patent documents, there is a case in which the heat generation distribution assumed at the beginning is greatly different. In general, a glass defogger with a defogger for a vehicle uses a high-viscosity paste having a low printability and containing a large amount of fine particles such as silver, and thus is formed through the following steps using screen printing. The screen used for this screen printing was coated with a light-sensitive emulsion uniformly on the screen, the heat ray pattern portion to be produced was shielded from light by a positive film, etc., and then the light-sensitive emulsion was cured by exposure to light. A portion of the photosensitive emulsion is washed by washing or the like to form a pattern for forming a heat ray pattern.
Here, the photosensitive emulsion is coated thicker than the screen, and friction or viscosity is generated at the contact portion between the cured photosensitive emulsion and the paste forming the defogger. That is, the cross section of the heat ray exhibits a substantially M-shape in which the center of the upper side is recessed with respect to the glass plate surface. Further, when the corner portion of the squeegee used in screen printing passes through the pattern for forming the heat ray pattern, it fits into the groove of the pattern, scrapes out the paste of the stuck portion, and the portion is recessed, so that the shape of the heat ray Will exhibit an approximately M-shape. And, when the heat ray is a thick line, since the degree of fitting into the groove of the pattern of the corner portion of the squeegee is larger than the case of the thin line, the case where the heat ray is a thick line is more likely to exhibit a substantially M shape, In the case of a thin line, although the upper side has a dent and presents an M shape, it has a shape close to a rectangular shape.

JP 2010-11005 A JP 2010-28669 A

Due to the cross-sectional shape of the heat ray and the like, when trying to realize a pattern with a large line width difference as disclosed in the above patent document with a thin line width, the heat generation distribution in the actual product defogger is initially assumed. There was a case where a problem greatly different from the generated heat distribution occurred. In particular, when the inventors try to realize a pattern with a thin line width of 0.5 mm or less, the heat generation distribution in the actual defogger tends to be different from the heat generation distribution originally assumed. I found. And when using glass with a defogger for vehicles, the heat generated by the defogger's hot wire is large, and if there is a local abnormal heat, there is a problem that the glass plate is cracked. The distribution is required to be close to the heat generation distribution assumed when designing the defogger heat ray pattern.
In view of the above situation, the present invention has a small difference from the assumed heat generation distribution, suppresses abnormal local heat generation, reduces the influence of heat caused by the defogger's heat rays on the antenna, and has a good appearance with defogger The purpose is to provide.

As a result of intensive studies to achieve the above object, the present inventors can solve the above-mentioned problems by setting the relationship between the line width of the thin line portion and the line width of the thick line portion to a predetermined one. I found. The present invention has been completed based on such findings.
That is, the gist of the present invention is as follows.

1. A glass with a defogger having a defogger on its surface, wherein the defogger is a first hot wire having a line width W ₁ (mm), a second hot wire having a line width W ₂ (mm), and the first hot wire, A glass with a defogger, comprising a third heat wire having a line width W ₃ (mm) connected to the second heat wire, wherein W ₁ , W ₂ , and W ₃ satisfy the following formula: .
W ₃ = α × (W ₁ + W ₂ ) (where α is 1 <α <4)
2. The glass with a defogger according to 1 above, wherein each side has a bus bar, a defogger is provided between the bus bars, and the third heat wire exists in a region where the bus bars on the both sides are installed.

  According to the present invention, it is possible to obtain a glass with a defogger that has a small difference from the assumed heat generation distribution, suppresses abnormal local heat generation, reduces the influence of the defogger's heat rays on the antenna, and has a good appearance.

It is a front view which shows one aspect | mode of the glass with a defogger of this invention. It is an enlarged view of the pattern part which the 1st heat ray, the 2nd heat ray, and the 3rd heat ray form in one mode of glass with a defogger shown in FIG. It is a front view of the glass with a defogger produced in the Example. It is an enlarged view of the pattern part which the 1st heat ray, the 2nd heat ray, and the 3rd heat ray form in the glass with a defogger shown in FIG. It is the result of having measured the thickness of the section of a thin line part and a thick line part with a contact type surface roughness meter. It is an enlarged view of the pattern part which the 1st heat ray, the 2nd heat ray, and the 3rd heat ray used in Examples 10 and 12 form. It is an enlarged view of the pattern part which the 1st heat ray, the 2nd heat ray, and the 3rd heat ray used in Example 11 and 13 form.

[Glass with defogger]
The glass with a defogger of the present invention includes a defogger on the surface thereof, and the defogger has a first hot wire having a line width W ₁ (mm), a second hot wire having a line width W ₂ (mm), and the first It is provided with a third heat wire having a line width W ₃ (mm) in which the heat wire and the second heat wire are connected, and the line widths W ₁ , W ₂ , and W _{3 of} each line satisfy the following formula: It is a feature.
W ₃ = α × (W ₁ + W ₂ ) (where α is 1 <α <4)

The glass with a defogger of the present invention will be described with reference to FIGS. FIG. 1 is a front view showing a preferred embodiment of the glass with a defogger of the present invention, and is a schematic view when the glass with a defogger is installed on an object to be installed. FIG. 2 shows an enlarged view of a pattern portion formed by the first hot wire, the second hot wire, and the third hot wire in one embodiment of the glass with a defogger shown in FIG.
The pattern portion shown in FIG. 2 has a mode in which the first heat wire and the second heat wire are connected to the third heat wire, and the third heat wire is wider than the first heat wire and the second heat wire. ing. The first heat wire and the second heat wire may be connected to the third heat wire one by one, or a plurality of first heat wires and second heat wires may be connected as shown in FIG. Moreover, it is good also as a 3rd heat ray to the starting point of a branch (3rd heat wire shown as 4 (4C2) in FIG. 2), or a 3rd heat wire which hangs a 1st heat wire and a 2nd heat wire in the shape of a comb. Good (3rd heat ray shown as 4 (4C1) in FIG. 2).

In the present invention, if the line width of the first heat wire is W ₁ (mm), the line width of the second heat wire is W ₂ (mm), and the line width of the third heat wire is W ₃ (mm), W ₁ , W ₂ and W ₃ need to satisfy the following formula.
W ₃ = α × (W ₁ + W ₂ )
In the formula, α is 1 <α <4. When α is 1 or less, local abnormal heat generation in the third heat wire occurs, and the influence of heat from the defogger heat wire on the antenna increases, and the sensitivity of the antenna decreases. On the other hand, if α is 3 or more, the line width of the third hot wire becomes too thick, the difference from the assumed heat generation distribution becomes large, and the appearance is poor. From such a viewpoint, α is preferably 1 <α <3, more preferably 1 <α <2.5, and further preferably 1.5 <α <2.5.
In addition, as the line width W _{1 of the} heat ray becomes narrower, for example, 0.5 mm or less, the cross section of the heat ray is not substantially M-shaped but thicker than the thick line part as shown by the thin line part in FIG. In addition, the thickness tends to increase because it is difficult to spread due to its own weight. Therefore, when the heat ray becomes thin, α is preferably selected to be larger. Specifically, 2 <α <4 is preferable, and 2.5 <α <4 is more preferable.

As can be seen from the above equation, W ₃ is larger than W ₁ and W ₂ , that is, the line width of the third heat wire is thicker than that of the first heat wire and the second heat wire. The hot wire and the second hot wire may be referred to as a thin wire portion, and the third hot wire may be referred to as a thick wire portion.

W ₁ and W ₂ are preferably from 0.1 to 1.2 mm, more preferably from 0.1 to 0.5 mm, still more preferably from 0.2 mm to less than 0.5 mm, particularly preferably 0. .2 to 0.4 mm. When W ₁ and W ₂ are within the above range, the first heat wire and the second heat wire can be easily formed, and the line width of the third heat wire can be reduced, so that the appearance can be improved. it can. W ₁ and W ₂ may be the same or different.

W ₃ is determined by the above formula, but the specific numerical range is preferably 0.5 mm or more, more preferably 0.5 to 5 mm, and further preferably 0.5 to 1.8 mm. Preferably, 0.7 to 1.2 mm is particularly preferable. When a plurality of third heat rays are present, W ₃ may be the same or different. When W ₃ is within the above range, the difference from the assumed heat generation distribution is reduced due to the relationship between the line widths of the first heat line and the second heat line, abnormal heat generation is locally suppressed, and the appearance is improved. .

The thickness of the first hot wire and the second hot wire is preferably 8 to 20 μm, more preferably 8 to 15 μm, which may be the same or different. Moreover, it is preferable that the thickness of the 3rd heat ray is 5-10 micrometers, More preferably, it is 7-10 micrometers, When the 3rd heat ray exists in multiple numbers, the thickness may be the same or different. This is because, by setting the thickness of these heat rays within the above range, the difference from the assumed heat generation distribution is small, and abnormal heat generation is locally suppressed.
Further, from the same viewpoint, it is preferable that the thickness of the third heat wire is thinner than the first heat wire and the second heat wire. Here, as shown in FIG. 5, the thickness of the hot wire is generally the most M-shaped when the cross section of the hot wire is measured with a contact type surface roughness meter, since the cross section of the hot wire usually has a substantially M shape. The thickened part is the thickness of the heat ray. The thickness of the third heat wire is larger than that of the heat wire having a narrow line width, because the paste forming the heat wire is likely to spread in the width direction due to its own weight. It tends to be thinner than the thickness.

  When the glass with a defogger according to the present invention is used for a vehicle, an antenna such as a TV antenna or an AM / FM antenna is usually provided at a location close to the side as shown in FIG. It is necessary to provide these antennas and defogger on the glass plate. For this reason, the distance between the antenna and the defogger becomes close, and the antenna is easily affected by the heat generated by the defogger. On the other hand, the defogger usually removes the fogging of the central portion (region X shown in FIG. 1) of the glass plate first, and then removes the fogging toward the side portion (region Y shown in FIG. 1). Designed. Therefore, it is preferable to arrange | position the 3rd heat ray in which the emitted-heat amount is reduced in the side part (area | region Y) of the glass plate close | similar to an antenna, as FIG. 1 shows. The influence of heat on the antenna can be reduced, and the heat rays in the central part (region X) of the glass plate generate more heat, so the fogging of the central part (region X) of the glass plate is removed first, and then the side part This is because fogging can be removed toward (region Y).

  Further, in order to remove the fog in the central portion (region X) of the glass plate first and then remove the fog toward the side portion (region Y), the central portion (region X) of the glass plate shown in FIG. It is preferable that the line width of the 1st heat ray in 2) and a 2nd heat ray is thinner than the line width in the side part (area | region Y) of a glass plate. This is because by setting such a line width, the amount of heat generated by the heat ray in the central portion (region X) of the glass plate can be made larger than that of the side portion (region Y) of the glass plate. Here, although the center part (area | region X) of a glass plate is based also on the magnitude | size of a glass plate, Preferably it is about 200 mm length (400 mm length centering | focusing on a center line) on either side from the center line of a glass plate. It is an area.

  The line resistance of the third hot wire is preferably 0.07 to 3.2 Ω / dm. Here, dm indicates 10 cm. If the wire resistance is 0.07 Ω / dm or more, heat generation can be expected to obtain a sufficient defogger performance, while if it is 3.2 Ω / dm or less, locally abnormal heat generation is suppressed, It becomes easy to design to remove the fog at the center first and then remove the fog toward the side.

It is preferable that the emitted-heat amount per unit area of a 3rd hot wire is 180-800 W / m < ² >. If it is 180 W / m ² or more, the performance of the defogger does not deteriorate as compared with other heat rays on the side, and if it is 800 W / m ² or less, abnormal heat generation can be suppressed locally. From this viewpoint, the amount of heat generated per unit area of the third heat ray is more preferably 250~600W / m ^2, preferably further a 300~400W / m ^2. Since the heat ray at the center of the glass plate generates heat, the fog at the center of the glass plate can usually be removed first, and then the fog can be removed toward the side.
Moreover, it is preferable that the emitted-heat amount per unit area of a 1st hot wire and the 2nd hot wire is in the range of the emitted-heat amount per unit area of said 3rd hot wire from a viewpoint of suppressing abnormal heat generation locally.

The heat ray pattern in which the first heat wire and the second heat wire shown in FIG. 2 are connected to the third heat wire may be at least one place on the glass plate, and it is preferable that there are a plurality of places from the viewpoint of expanding the area where the antenna is provided. . As shown in FIG. 1, the heat ray pattern provided on the glass plate is usually designed symmetrically about the center line of the glass plate, so if there is one on the left side, there is also one on the right side. Therefore, there are two places as the whole glass plate.
As shown in FIG. 2, one side (region Y) may have a heat ray pattern in which two first heat rays and second heat rays are connected to a third heat ray, or three or more. The third heat ray may be present.

As shown in FIG. 1, the glass with a defogger of the present invention is provided with bus bars on both sides thereof, the defogger is provided between the bus bars, and the third heat wire is provided with the bus bar. It is preferable that it exists in the area. Since the third heat wire is also present in the area where the bus bar is installed, it is possible to reduce the influence of heat by the heat wire on the antenna, and usually the central cloud of the glass plate is removed first, and then the side part It is also possible to remove fogging. In addition, from the same viewpoint, the third heat ray is also provided in a range of preferably 40 mm, more preferably 30 mm from the ceramic collar portion. Here, the ceramic color is an area formed by a meltable glass frit containing a black pigment component on the peripheral edge of the glass plate, and is provided to improve the design and is also referred to as black sera. is there.
Moreover, the 3rd heat ray in the area | region where a bus bar is installed may be provided on this bus bar, and may be provided between the glass plate and the bus bar.

  As shown in FIG. 1, the glass with a defogger of the present invention is such that the pattern of the heat rays forming the defogger rises upward in a convex shape at the upper center of the glass when the glass is placed on an object to be installed, It is preferable that both sides exhibit a convex pattern that recedes downward. When the heat ray pattern has such a convex pattern, both sides of the heat ray are retreated downward, so that a non-heat generation area is secured between the antenna and the heat ray, thereby reducing the influence of heat caused by the heat ray on the antenna. In addition, the area where the antenna is provided can be expanded. Here, the glass installation object is preferably a glass object such as a TV antenna, for example, a vehicle.

  The distance (line pitch) between the adjacent first heat wires, between the second heat wires, or between the first heat wire and the second heat wire when providing the first heat wire and the second heat wire is the glass shown in FIG. In the center part (area | region X) of a board, although it is based also on the magnitude | size of the glass plate which provides a heat ray, Preferably it is 10-40 mm, More preferably, it is 20-40 mm. If the pitch between the first hot wire and the second hot wire is within the above range, the difference from the assumed heat generation distribution becomes small, abnormal heat generation is suppressed locally, and the influence of heat by the heat wire on the antenna is reduced. It is also possible to easily arrange the heat ray pattern.

In addition, as shown in FIG. 2, when there are a plurality of third heat rays on one side, the interval between adjacent third heat rays (interline pitch) depends on the size of the glass plate on which the heat rays are provided. However, it is preferably 10 to 40 mm, more preferably 20 to 40 mm. This is because the difference from the assumed heat generation distribution is reduced, abnormal heat generation is locally suppressed, the influence of heat from the heat rays on the antenna can be reduced, and the arrangement of the heat ray pattern is easy. In addition, designing the gap between the third hot wires (interline pitch) to be wider than the interline pitch (H ₁ ) between the first hot wire and the second hot wire means providing an antenna wire between the third hot wires. This is possible and is advantageous in terms of design freedom.

In order to widen the region where the antenna is provided, the heat ray pattern is a pattern having a convex pattern, and the distance between the third heat rays (inter-line pitch: H ₂ (mm)) is the third of the first heat ray and the second heat ray. interval on the side (area Y) of the glass plate before being connected to the hot wire: it is preferable to narrow from (line pitch H ₁ (mm)). On the other hand, if the distance between the third hot wires (inter-line pitch) is narrowed, the amount of heat generated by the third hot wire increases and abnormal heat is generated locally. Therefore, it is necessary to increase the line width of the third hot wire. Arise. From such a viewpoint, it is preferable that W ₁ , W ₂ , W ₃ , H ₁ , and H ₂ satisfy the following formula (2).
W ₃ = β × (W ₁ + W ₂ ) × (H ₁ / H ₂ ) Formula (2)
In the formula (2), β is preferably 0.7 <β <3.5, more preferably 1 <β <3, and further preferably 1 <β <2. If β is in the above range, the difference from the assumed heat generation distribution becomes small, abnormal heat generation is suppressed locally, and the influence of heat from the heat rays on the antenna can be reduced. In particular, when the amount of heat generated by the defogger's heat ray is uniform over the entire surface of the glass plate and it is desired to efficiently prevent fogging over the entire surface of the glass plate, W ₁ , W ₂ , W ₃ , H ₁ , and H ₂ are It is effective to satisfy the condition of the above formula (2).
In addition, as the line width W _{1 of the} heat ray becomes narrower, for example, 0.5 mm or less, the cross section of the heat ray is not substantially M-shaped but thicker than the thick line part as shown by the thin line part in FIG. In addition, the thickness tends to increase because it is difficult to spread due to its own weight. Therefore, when the heat ray becomes thin, β is preferably selected to be larger. Specifically, 1 <β <3.5 is preferable, and 2 <β <3.5 is more preferable.

  When the defogger-equipped glass of the present invention is used for a vehicle, since the calorific value of the heat ray of the defogger for the vehicle is large, a serious problem such as a crack in the glass plate may occur if abnormal heat is generated locally. . Therefore, it is strongly desired that the amount of heat generated in the actual product defogger shows a heat generation close to the heat distribution assumed when designing the defogger hot wire. If the defogger pattern is designed to satisfy the relationship of the line widths of the first hot wire, the second hot wire, and the third hot wire defined in the present invention, the resistance before and after the first hot wire and the second hot wire merge. Since the values are about the same, that is, the calorific value is about the same, no abnormal occurrence occurs locally. Therefore, the glass with a defogger of the present invention is suitably used as a vehicle window glass from the viewpoint of taking advantage of the effect.

The glass with a defogger of the present invention having the above-described configuration is such that any of the first hot wire, the second hot wire, and the third hot wire constituting the defogger exhibits the excellent effect of the defogger and Since the temperature can reduce the influence of heat, preferably 70 ° C. or less, the influence of heat caused by the defogger's hot wire on the antenna can be reduced, which is advantageous from the viewpoint of safety.
Moreover, since the glass with a defogger of the present invention has a small temperature difference between the first heat wire and the second heat wire (thin wire portion) and the third heat wire (thick wire portion), preferably 15 ° C. or less, the assumed heat generation distribution The difference from the above is small, and abnormal heat generation locally is suppressed.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
[Evaluation method]

Example 1
As shown in FIG. 3, the rear glass of the vehicle has bus bars 5 on both sides thereof, and a defogger 3 including a heat wire 4 between the bus bars 5, and antennas such as a television antenna 7 are provided on the defogger 3. Formed.
The central portion of the defogger 3 has 16 heat wires in the vertical direction. As shown in FIG. 4, the first and second heat wires from the top are the first heat wires # 1 (line width W ₁ : 0). 3 mm) and the second hot wire # 1 (line width W ₂ : 0.3 mm), and the third and fourth heat wires from the top are the first heat wire # 2 (line width W ₁ : 0.3 mm) and the second heat wire, respectively. The second heat wire # 2 (line width W ₂ : 0.3 mm), and the fifth and sixth heat wires from the top are the first heat wire # 3 (line width W ₁ : 0.3 mm) and the second heat wire # 3 ( Line width W ₂ : 0.3 mm). The first hot wire # 1 and the second hot war # 1 are connected to the third hot wire # 1 (line width W ₃ : 1.0 mm), the third hot wire # 1 is connected to the bus bar 5, and the first hot wire # 2 and The second hot war # 2 is connected to the third hot wire # 2 (line width W ₃ : 1.0 mm), the third hot wire # 2 is connected to the bus bar 5, and the first hot wire # 3 and the second hot wire # 3 are It is connected to the third hot wire # 3 (line width W ₃ : 1.0 mm), and the third hot wire # 3 is connected to the bus bar 5.
The distance between the first heat wire and the second heat wire and the distance between the third heat wires (inter-line pitch) are 30 mm.
Further, the heat ray pattern shown in FIG. 3 has a convex pattern in which the upper central portion of the glass plate is raised upward and convex on both sides, and the both sides receded downward. Since a heat generating area can be secured and the influence of heat rays on the antenna can be reduced, a sufficient area where the antenna can be formed is secured.

  As for the heat ray, a screen having a heat ray pattern as shown in FIG. 3 is prepared, screen-printed with a silver paste using the screen, heated in a furnace and fired, and then subjected to air-cooling strengthening processing. Formed. Here, the line width was measured using a loupe. The result of having measured the cross section of the 1st hot wire, the 2nd hot wire, and the 3rd hot wire using the contact-type surface roughness meter is shown in FIG. The cross sections of the first heat wire and the second heat wire (“thin wire portion” in FIG. 5) and the third heat wire (“thick wire portion” in FIG. 5) are substantially M-shaped with a recessed center. The thickness of the second hot wire was 12 μm, and the thickness of the third hot wire was 9 μm. Also, it can be seen that a thick line width is closer to an M-shape, and a thin-thick line is a shape close to a rectangular shape, although the upper side has a dent and presents an M shape.

In FIG. 3, the region before connection of the first to sixth heat wires from the top and the second heat wire to the third heat wire is a “pre-connection region (region B)”, and the seventh to sixteenth heat wires are the third heat wires. When the region without connection to the region is referred to as “connection unrelated region (region A)”, and the region of the third heat wire immediately after the first and second heat wires are connected is referred to as “region immediately after connection (region C)” The amount of heat generated in each region was 300 W / m ² . Here, the calorific value is the calorific value when the obtained glass with defogger is energized by applying a voltage of 12 V between the bus bars.

Examples 2-9
In Example 1, an unrelated region (region A), a region before connection (region B, a region constituted by the first heat wire and the second heat wire), and a region immediately after connection (region C, a region constituted by the third heat wire) A glass with a defogger was produced in the same manner as in Example 1 except that the line width and the pitch between lines in Table 1 were changed as shown in Table 1, and the calorific value was measured. Table 1 shows the amount of heat generated in each region.

Comparative Example 1
In Example 1, a glass with a defogger was produced in the same manner as in Example 1 except that the line width W ₃ of the third hot wires # 1 and # 2 was 0.55 mm. About the obtained glass with a defogger, the emitted-heat amount in 3rd hot wire # 1 and # 2 (area | region C) became 900 W / m < ² >, and the local abnormal heat generation was confirmed.

It was confirmed that the glass with a defogger of the present invention has a small difference from the assumed heat generation distribution, suppresses abnormal heat generation locally, reduces the influence of heat due to the defogger's heat rays on the antenna, and has a good appearance. . In the present invention, if W ₁ (mm), W ₂ (mm), and line width W ₃ (mm) satisfy a predetermined relationship, the relationship between local abnormal heat reduction and appearance Various heat ray patterns can be determined. In addition, as in Examples 2 to 4 and 6, by making the line width of the region A thinner than the line width of the region B, the heat ray in the central part of the glass plate generates heat, so the central part of the glass plate The fog can be removed first, and then the fog can be removed toward the side.

From the comparison between Example 1 and Example 8, for example, by narrowing the line pitch of the third heat rays in the region C, the amount of heat generation is made larger than in other places while suppressing abnormal heat generation locally in the region C. Can do. Further, from the comparison between Example 8 and Example 9, by increasing the line width of the third hot wire in the region C, the amount of heat generated in the regions A to C can be increased equally. It is also possible to increase the heat generation amount in the areas A to C uniformly. As described above, according to the present invention, the line widths of the first heat wire, the second heat wire, and the third heat wire, and the pitch between the lines are set within the predetermined range defined in the present invention. It is possible to adjust the amount of heat generation in a desired region while suppressing abnormal heat generation.
In each example, the line widths (W ₁ , W ₂ and W ₃ ) and the line pitches (H ₁ and H ₂ ) for a plurality of heat rays existing in each region are all the same value. However, even if they are not the same, the effect of the present invention can be obtained if these values are within the range defined by the present invention.

Example 10
As shown in FIG. 3, the rear glass of the vehicle has bus bars 5 on both sides thereof, and a defogger 3 including a heat wire 4 between the bus bars 5, and antennas such as a television antenna 7 are provided on the defogger 3. Formed. Moreover, in Example 10, the pattern of FIG. 4 employ | adopted in Examples 1-9 is changed into the pattern shown by FIG. 6, ie, 1st heat wire # 3 of FIG. 4, 2nd heat wire # 3, and 1st. The third heat wire # 3 was not provided, and the shapes of the first heat wires # 1 and # 2, the second heat wires # 1 and # 2, and the third heat wires # 1 and # 2 were changed to the shapes shown in FIG.
The central portion of the defogger 3 has 16 heat wires in the vertical direction. As shown in FIG. 6, the first and second heat wires from the top are the first heat wires # 1 (line width W ₁ : 1), respectively. 0.0 mm), the second heat wire # 1 (line width W ₂ : 1.0 mm), and the third and fourth heat wires from the top are the first heat wire # 2 (line width W ₁ : 1.0 mm) and the second heat wire, respectively. Second hot wire # 2 (line width W ₂ : 1.0 mm). The first hot wire # 1 and the second hot war # 1 are connected to the third hot wire # 1 (line width W ₃ : 2.2 mm), the third hot wire # 1 is connected to the bus bar 5, and the first hot wire # 2 and The second hot war # 2 is connected to the third hot wire # 2 (line width W ₃ : 2.2 mm), and the third hot wire # 2 is connected to the bus bar 5.
The distance (line pitch) between the first heat line and the second heat line is 10 mm, the distance (line pitch) between the third heat lines is 20 mm, and the length of the third heat line is 100 mm.
Further, the heat ray pattern shown in FIG. 3 has a convex pattern in which the upper central portion of the glass plate is raised upward and convex on both sides, and the both sides receded downward. Since a heat generating area can be secured and the influence of heat rays on the antenna can be reduced, a sufficient area where the antenna can be formed is secured.

  A glass with a defogger was produced in the same manner as in Example 1 except that the first hot wire, the second hot wire, and the third hot wire were configured as described above, and the calorific value was measured. The amount of heat generated in each region is shown in Table 2.

Example 11
In the same manner as in the tenth embodiment, the pattern shown in FIG. 4 employed in the first to ninth embodiments is changed to the pattern shown in FIG. 7, that is, the first hot wire # 3, the second hot wire # 3, and the third heat wire shown in FIG. The hot wire # 3 was not provided, and the shapes of the first hot wires # 1 and # 2, the second hot wires # 1 and # 2, and the third hot wires # 1 and # 2 were changed to the shapes shown in FIG.
The central portion of the defogger 3 has 16 heat wires in the vertical direction. As shown in FIG. 7, the first and second heat wires from the top are respectively the first heat wires # 1 (line width W ₁ : 1). 0.0 mm), the second heat wire # 1 (line width W ₂ : 1.0 mm), and the third and fourth heat wires from the top are the first heat wire # 2 (line width W ₁ : 1.0 mm) and the second heat wire, respectively. Second hot wire # 2 (line width W ₂ : 1.0 mm). The first hot wire # 1 and the second hot war # 1 are connected to the third hot wire # 1 (line width W ₃ : 4.4 mm), the third hot wire # 1 is connected to the bus bar 5, and the first hot wire # 2 and The second heat battle # 2 is connected to the third heat wire # 2 (line width W ₃ : 4.4 mm), and the third heat wire # 2 is connected to the bus bar 5.
The distance between the first heat wires and the second heat wire (interline pitch, H ₁ ) is 10 mm, the distance between the third heat wires (interline pitch, H ₂ ) is 20 mm, and the length of the third heat wire is 100 mm. It is.
Further, the heat ray pattern shown in FIG. 3 has a convex pattern in which the upper central portion of the glass plate is raised upward and convex on both sides, and the both sides receded downward. Since a heat generating area can be secured and the influence of heat rays on the antenna can be reduced, a sufficient area where the antenna can be formed is secured.

  A glass with a defogger was produced in the same manner as in Example 1 except that the first hot wire, the second hot wire, and the third hot wire were configured as described above, and the calorific value was measured. The amount of heat generated in each region is shown in Table 2.

Example 12
In Example 10, a glass with a defogger was obtained in the same manner as in Example 10 except that the line width, the line width W ₁ , the line width W ₂ , and the line width W ₃ in the region A were as shown in Table 2. It produced and the calorific value was measured. The amount of heat generated in each region is shown in Table 2.

Example 13
In Example 11, the glass with a defogger was obtained in the same manner as in Example 11 except that the line width, the line width W ₁ , the line width W ₂ , and the line width W ₃ in the region A were as shown in Table 2. It produced and the calorific value was measured. The amount of heat generated in each region is shown in Table 2.

Also in Examples 10 to 13 having patterns different from those in Examples 1 to 9, the defogger-equipped glass of the present invention has a small difference from the assumed heat generation distribution, suppresses abnormal heat generation locally, and is a defogger for the antenna. It was confirmed that the effect of heat caused by the heat ray of this product was reduced and it looked good. In addition, if W ₁ (mm), W ₂ (mm), and line width W ₃ (mm) satisfy a predetermined relationship, a variety of local abnormal heat reduction and appearance can be used. It was also confirmed that the heat ray pattern could be determined.

In Examples 10 and 11, the pitch between lines is changed. In this case, in order to reduce local abnormal heat generation, it is important to consider the influence of the line width of the third region. is there. That is, in order to reduce local abnormal heat generation, the relationship between the line width of the third region, the line widths (W ₁ and W ₂ ) of the first region and the second region, and the pitch between the lines is also important. Of course, the relationship between the above formula (1) and the relationship between the line width (W ₁ and W ₂ ) and the pitch ratio between the lines (H ₁ / H ₂ ) as defined in the formula (2). It can be seen that it is preferable to consider these simultaneously.

Examples 12 and 13 are cases in which the line widths (W ₁ and W ₂ ) in the regions A and B were reduced from 1.0 mm to 0.3 mm in Examples 10 and 11, respectively. From these examples, when the line widths (W ₁ and W ₂ ) in the regions A and B are made narrower, for example, 0.5 mm or less, from the viewpoint of reducing local abnormal heat generation, It can be seen that α in (1) is preferably selected to be larger, such as 2 <α <4.

  In order to make the calorific value in each region the same level, the thickness of the first heat wire and the second heat wire in Examples 12 and 13 is set to 12 μm, and the thickness of the first heat wire and the second heat wire in Examples 10 and 11 is used. The thickness is 9 μm, which is thinner than Examples 12 and 13. Therefore, there is a difference between these embodiments as shown in FIG. 5 in the cross-sectional shapes of the first hot wire and the second hot wire. If the line widths of the first hot wire and the second hot wire are narrowed, the influence of the difference in cross-sectional shape of the hot wire tends to increase, so from this point of view, α in formula (1) should be made larger. It turns out that is preferable.

According to the present invention, it is possible to obtain a glass with a defogger that has a small difference from the assumed heat generation distribution, suppresses abnormal heat generation locally, reduces the influence of heat due to the defogger's heat rays on the antenna, and has a good appearance. it can.
This glass with a defogger is preferably used for a window glass for an application such as a vehicle, particularly an automobile, in which an antenna such as a television antenna is provided on the glass.

1. 1. Glass with defogger 2. Glass plate Defogger 4. Heat ray 4A. 1st heat ray 4B. Second hot wire 4C. 3. Third heat wire Bus bar 6. 6. meander shape TV antenna

Claims (6)

A glass with a defogger comprising a defogger and two bus bars on the surface, wherein the defogger has a first hot wire having a line width W ₁ (mm), a second hot wire having a line width W ₂ (mm), and the first line width 1 and the heat ray and the second hot wire is connected, and a third heat ray is _W 3 (mm), and the _{W 1} and _{W 2} are 0.1mm or more 0.5mm or less, _{W 3} greater than 0.5 mm, and, _W 1, _{W 2,} and _{W 3} are satisfied equation (1) below, and rather lower than the third height of the hot wire of the first heat ray and second heat ray height The two bus bars are provided on both sides of the glass, the defogger is provided between the bus bars, and the first hot wire, the second hot wire, and the bus bar are connected by the third hot wire. It is, defogger with glass, characterized in that.
W ₃ = α × (W ₁ + W ₂ ) Formula (1)
(Wherein α is 1 <α <4) There are a plurality of third heat wires, the interval between the third heat wires is H ₂ (mm), the interval before the first heat wire and the second heat wire are connected to the third heat wire is H ₁ (mm), The glass with a defogger according to claim ₁ , wherein W ₁ , W ₂ , W ₃ , H ₁ , and H ₂ satisfy the following formula (2).
W ₃ = β × (W ₁ + W ₂ ) × (H ₁ / H ₂ ) Formula (2)
(Wherein β is 0.7 <β <3.5)   The glass with a defogger according to claim 1 or 2, wherein the thickness of the first hot wire and the second hot wire is 8 to 20 µm.   The glass with a defogger according to any one of claims 1 to 3, wherein a thickness of the third heat ray is thinner than that of the first heat ray and the second heat ray.   The defogger according to any one of claims 1 to 4, wherein bus bars are provided on both sides, a defogger is provided between the bus bars, and the third heat wire exists in a region where the bus bars on both sides are installed. With glass.   The glass with a defogger according to any one of claims 1 to 5, which is used for a window glass for a vehicle.

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