CN111775669B

CN111775669B - Heating glass for side window of automobile

Info

Publication number: CN111775669B
Application number: CN202010616776.1A
Authority: CN
Inventors: 宋国山; 周耀; 陈强
Original assignee: Fuyao Glass Industry Group Co Ltd
Current assignee: Fuyao Glass Industry Group Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-11-19
Anticipated expiration: 2040-07-01
Also published as: CN111775669A

Abstract

The invention relates to the field of glass products, in particular to glass installed on an automobile, and particularly provides heating glass for an automobile side window. The automobile side window heating glass comprises an outer glass plate, a thermoplastic interlayer and an inner glass plate, wherein a first bus bar and a second bus bar are further arranged between the outer glass plate and the inner glass plate, the second bus bar comprises a first parallel section, at least one inclined section and at least one second parallel section, one end of each inclined section is electrically connected with the second parallel section, and the other end of each inclined section is electrically connected with the first parallel section or the other second parallel section. The invention can meet the requirements of quick defrosting and demisting, and can avoid overhigh local temperature caused by overhigh heating power density due to the local irregular shape of the glass, so that the whole heating temperature is uniform and the temperature difference is less than 5 ℃; the arrangement structure that the metal wires are circuitous for many times is avoided, the automatic wire distribution device is suitable for automatic wire distribution processes of mechanical arms and the like, and the production efficiency is improved.

Description

Heating glass for side window of automobile

The technical field is as follows:

the invention relates to the field of glass products, in particular to glass installed on an automobile, and particularly provides heating glass for an automobile side window.

Background art:

in cold or humid weather conditions, in order to meet the requirements of safety and comfort in driving, the automobile glass needs to have a heating function, such as a front windshield heating glass, a rear windshield heating glass, etc., and these heating glasses usually use a transparent conductive coating, a metal wire or a printed silver paste to heat the glass, so as to raise the temperature of the glass surface and achieve the defrosting and defogging effects.

The automobile side window glass is also gradually required to be provided with a heating function, particularly, the liftable door glass can adopt laminated glass comprising an outer glass plate, a thermoplastic intermediate layer and an inner glass plate, a metal wire is embedded in the thermoplastic intermediate layer, and the current of a power supply is introduced into the metal wire through two bus bars with different polarities, so that the heating function is realized.

Conventionally, two bus bars are arranged in parallel as a whole or even in a straight line at the lower edge of a side window glass so that the two bus bars can be always hidden inside the vehicle body, for example, patent CN100375579C discloses a heated window glass comprising two rigid window glasses, two bus bars of different polarities arranged in parallel near one side of the heated window glass and having different distances with respect to the one side, and linear heating resistance wires electrically connected to the bus bars, which are arranged in adjacent portions of the lower side of the window glass for a side window glass of a vehicle; for another example, patent CN1887030A discloses a heatable glass pane comprising two contact busbars of different polarities arranged substantially parallel to each other in a longitudinal direction and to a bottom edge of the heatable glass pane, and a bundle of heating wires in electrical contact with the contact busbars, the two contact busbars being arranged substantially in line in their longitudinal direction.

In the prior art, two busbars are also arranged in a wholly parallel or completely overlapping manner at the front edge and/or rear edge of the sidelite glazing, for example patent CN106457774A discloses a heatable laminated side glass pane comprising an outer glass pane and an inner glass pane joined to one another by a thermoplastic interlayer, and at least one heating wire embedded in the interlayer, which heating wire extends between a first busbar and a second busbar and is electrically conductively connected to the busbars, wherein the first busbar and the second busbar are arranged along the front edge or the rear edge. Two bus bars are arranged at the side edge of the side window glass of the automobile, the two bus bars can be exposed in the field of vision of people, the appearance is not attractive, and for the lifting door glass, the bus bars at the side edge are difficult to design, and even the stability problem is easy to occur.

If two bus bars are provided at the lower edge, since the shape of the side window glass of the automobile is irregular, a complicated pattern of arranging wires needs to be designed to reduce the unevenness of the overall heating, which increases the difficulty and cost of the wire laying process, and even due to the increased recognizability of the complicated pattern, such as the wire laying pattern shown in CN1887030A, WO2019039318a1, the view of the surrounding environment by the driver may be obstructed.

Simultaneously, because the car especially electric automobile is more and more high to syllable-dividing requirement for car side window glass also disposes sound-insulating properties, with the sound comfort level in improving the car, improves and drives experience.

The invention content is as follows:

the invention aims to solve the technical problem of providing the automobile side window heating glass which has high heating efficiency, uniform integral heating and simple wire distribution process aiming at the defects of the automobile side window glass heated by metal wires.

The technical scheme adopted by the invention for solving the technical problems is as follows: a heating glass for the side window of car is composed of an external glass plate, a thermoplastic intermediate layer between said external and internal glass plates, at least three metal wires are embedded in the thermoplastic interlayer, a first bus bar and a second bus bar are arranged between the outer glass plate and the inner glass plate, the first and second bus bars being disposed proximate the lower edge and extending between the front and rear edges, the second bus bar is positioned between the first bus bar and the lower edge, two ends of each metal wire are respectively electrically connected with the first bus bar and the second bus bar, each metal wire extends between the upper edge and the second bus bar and at least partially passes through the first bus bar in an insulated way; the method is characterized in that: the second bus bar includes a first parallel section, at least one inclined section, and at least one second parallel section, the first parallel section and the second parallel section are respectively parallel to the first bus bar, a distance between the second parallel section and the first bus bar is larger than a distance between the first parallel section and the first bus bar, one end of each inclined section is electrically connected to the second parallel section, and the other end of each inclined section is electrically connected to the first parallel section or the other second parallel section.

Preferably, the automobile side window heating glass is arranged at an opening of an automobile body, and the automobile side window heating glass can do lifting movement in the opening.

Preferably, the heating power density of the region heated by the metal wire electrically connected with the second parallel section is greater than the heating power density of the region heated by the metal wire electrically connected with the inclined section, and the heating power density of the region heated by the metal wire electrically connected with the inclined section is greater than or equal to the heating power density of the region heated by the metal wire electrically connected with the first parallel section.

Preferably, the ratio of the maximum power density to the minimum power density of the metal wire heating is greater than 1 and less than or equal to 1.05.

Preferably, the second parallel section is located within about 200mm in the horizontal direction from the front edge.

Preferably, each metal wire has a first extension section, a second extension section and at least one bent section, the bottom end of the first extension section is electrically connected with the first bus bar and extends towards the upper edge, the bottom end of the second extension section is electrically connected with the second bus bar and extends towards the upper edge, the second extension section passes through the first bus bar in an insulated manner, and the top end of the first extension section is electrically connected with the top end of the second extension section through the at least one bent section.

More preferably, the first and second extensions are parallel to each other, the first extension being parallel to the front edge.

More preferably, the metal wire, one end of which is electrically connected with the second parallel section, has only one bent section.

More preferably, a distance between the first and second extension sections of the metal wire electrically connected to the second parallel section is greater than or equal to a distance between the first and second extension sections of the metal wire electrically connected to the inclined section, and a distance between the first and second extension sections of the metal wire electrically connected to the inclined section is greater than a distance between the first and second extension sections of the metal wire electrically connected to the first parallel section.

More preferably, a distance between the first and second extending sections of one of the metal wires electrically connected to the second parallel section, which is close to the front edge, is larger than a distance between the first and second extending sections of one of the metal wires electrically connected to the second parallel section, which is far from the front edge.

Preferably, the inclined section has an angle α with the first parallel section, the angle α ranging from 90 ° < α < 180 °.

Preferably, the inclined section and the first parallel section have an angle α in the range of 127 ° ≦ α ≦ 174 °.

Preferably, the thickness of the first bus bar and the second bus bar is 10 to 200 μm.

Preferably, the material of the first and second parallel sections comprises at least one sheet of metal foil and the material of the inclined section comprises a printed silver paste strip.

Preferably, the thermoplastic intermediate layer includes two outer resin films and at least one intermediate resin film, the intermediate resin film having a hardness less than that of the outer resin films, the metal wire being embedded in one of the outer resin films, the metal wire being spaced from a nearest one of the intermediate resin films by a distance of 0.25 to 0.4 mm.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the automobile side window heating glass provided by the invention can meet the requirements of quick defrosting and demisting, and can avoid local overhigh temperature caused by overlarge heating power density due to local irregular shape of the glass, reduce the occurrence of adverse phenomena such as deformation or distortion of a metal wire due to the overhigh local temperature and ensure that the whole heating temperature is uniform and the temperature difference is less than 5 ℃; the arrangement structure that the metal wires are circuitous for many times is avoided, the attractive effect of neat appearance is achieved, the wire distribution process is simple, the wire distribution process is suitable for automatic wire distribution processes of manipulators and the like, and the production efficiency is improved.

Description of the drawings:

FIG. 1 is a schematic structural view of a side window heating glass for an automobile according to the present invention;

FIG. 2 is a schematic partial cross-sectional view of an automotive side window heater glass in accordance with the present invention;

FIG. 3 is a schematic partial cross-sectional view of a thermoplastic interlayer having a three-layer structure according to the present invention;

FIG. 4 is a partially enlarged schematic view of a side window heating glass for an automobile according to the present invention;

fig. 5 is a schematic structural view of a first embodiment of a second bus bar according to the present invention;

FIG. 6 is a schematic structural view of a second embodiment of a second bus bar according to the present invention;

fig. 7 is a schematic structural view of a third embodiment of a second bus bar according to the present invention.

The specific implementation mode is as follows:

the invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 and 2, the automotive side window heating glass of the invention is installed at an opening of an automotive body, has an upper edge 100, a lower edge 101, a front edge 102 and a rear edge 103, comprises an outer glass plate 1, a thermoplastic interlayer 2 and an inner glass plate 3, the thermoplastic interlayer 2 is sandwiched between the outer glass plate 1 and the inner glass plate 3, at least three metal wires 4 are embedded in the thermoplastic interlayer 2, a first bus bar 5 and a second bus bar 6 are further arranged between the outer glass plate 1 and the inner glass plate 3, the first bus bar 5 and the second bus bar 6 are arranged near the lower edge 101 and extend between the front edge 102 and the rear edge 103, the second bus bar 6 is arranged between the first bus bar 5 and the lower edge 101, two ends of each metal wire 4 are respectively electrically connected with the first bus bar 5 and the second bus bar 6, each metal conductor 4 extends between said upper edge 100 and a second busbar 6 and it passes at least partially insulated through said first busbar 5; the current of the power supply (not shown) is introduced into the metal wire 4 via the first bus bar 5 and the second bus bar 6, so that the metal wire 4 is heated, thereby heating the vehicle side window glass.

Wherein the upper edge 100 of the vehicle side window heating glass corresponds to the top edge in the direction of the drawing in fig. 1, and is positioned at the top of the opening, close to the roof of the vehicle; the lower edge 101 corresponds to the bottom edge in the direction of the drawing in fig. 1, the bottom at the opening, in the direction close to the ground; the front edge 102 corresponds to a right side edge in the direction of the drawing in fig. 1, which is located on the front side in the vehicle advancing direction at the opening; the rear edge 103 corresponds to the left edge in the direction of the drawing in fig. 1, and is located on the rear side of the opening in the forward direction of the vehicle. Correspondingly, the automobile side window heating glass can also do lifting motion in the opening, so that the opening of the automobile body is opened or closed.

In fig. 2, the metal wires 4 are located between the thermoplastic interlayer 2 and the outer glass pane 1; the invention is not limited thereto and the metal wires 4 may also be located between the thermoplastic interlayer 2 and the inner glass pane 3. The lower edge 101, the front edge 102 and the rear edge 103 are usually hidden for aesthetic reasons, i.e. are hidden by a frame at the opening of the vehicle body, and also for aesthetic reasons, the first bus bar 5 and the second bus bar 6 are also hidden, in particular, at a position below the water cut line 104 of the vehicle window shown in fig. 1, when the vehicle window heating glass is in a closed state, the part above the water cut line 104 is exposed at the opening, and the part below is hidden inside the vehicle body.

The thermoplastic interlayer 2 of the present invention is used to bond and fix the outer glass plate 1 and the inner glass plate 3 together, and for example, Polycarbonate (PC), polyvinyl chloride (PVC), polyvinyl butyral (PVB), Ethylene Vinyl Acetate (EVA), Polyacrylate (PA), polymethyl methacrylate (PMMA), Polyurethane (PUR), or the like may be used. The thermoplastic intermediate layer 2 may have a sound-insulating function to improve the sound comfort in the vehicle; the thermoplastic intermediate layer 2 may also be mass-coloured to protect the privacy of the vehicle occupants or for better viewing comfort; the thermoplastic middle layer 2 can also have the functions of heat insulation and/or ultraviolet insulation, and the functions are realized by depositing an infrared reflection film on the surface of the thermoplastic middle layer 2 or adding infrared insulation nanoparticles and/or ultraviolet insulation nanoparticles and the like into the thermoplastic middle layer 2 so as to improve the riding comfort in the vehicle. In particular, the thermoplastic interlayer 2 may be a single layer structure, such as conventional PVB, typically 0.76mm thick, or may be a two, three or even more layer structure.

In order to enable the heating function and the sound insulation function of the automobile side window heating glass at the same time, the thermoplastic intermediate layer 2 can be used for reducing the sound wave resonance of the automobile side window heating glass and various sounds and shielding sound transmission, so as to improve the sound comfort level in the automobile, and the thermoplastic intermediate layer 2 can be a sound insulation resin film with a single-layer structure or a sound insulation resin film with a multi-layer structure with at least two layers.

As shown in fig. 3, the thermoplastic intermediate layer 2 includes two outer resin films 21 and at least one intermediate resin film 22, the intermediate resin film 22 having a hardness smaller than that of the outer resin films 21, and the metal wires 4 are embedded in one of the outer resin films 21. Compared with the sound-insulating resin film with a single-layer structure, the sound-insulating resin film with a multi-layer structure is easy to generate bubbles in the production process of the laminated glass, the embedded metal wire 4 enables the laminated glass with the sound-insulating resin film with the multi-layer structure to generate bubbles easily, and in order to eliminate the bubbles and ensure the heating effect, the thickness of the outer resin film 21 embedded in the metal wire 4 is preferably 3-10 times that of the middle resin film 22; specifically, the thickness of the outer resin film 21 embedding the metal wire 4 is 0.3 to 0.5mm, such as 0.38mm, 0.4mm, the thickness of the middle resin film 22 is 0.05 to 0.1mm, such as 0.1mm, and the thickness of the other outer resin film 21 is 0.1 to 0.4mm, such as 0.2mm, 0.38 mm; more preferably, the hardness of the outer resin film 21 embedding the metal wire 4 is greater than that of the other outer resin film 21, and the hardness of the other outer resin film 21 is greater than that of the intermediate resin film, thereby ensuring that bubbles are not easily generated at the time of laminating in the process of producing laminated glass. Since the hardness of the intermediate resin film is less than that of the outer resin film, if the depth of embedding the metal wire 4 in the outer resin film is too deep, the sound insulation performance is affected, and if the depth of embedding is shallow, the metal wire 4 may have poor appearance defects such as deformation, distortion, and waviness, and more preferably, the optimum distance of the metal wire 4 from the nearest layer of the intermediate resin film is 0.25 to 0.4 mm.

Since automotive sidelights typically have irregular shapes, particularly in the area corresponding to the viewing mirror, the distance between the upper edge 100 and the lower edge 101 is reduced and cannot be laid too densely or with a too complex pattern in order to ensure that the viewing of the mirror is not obstructed. The present invention provides an automobile side window heating glass with simple wire arrangement pattern and uniform heating on the whole surface, preferably, the second bus bar 6 comprises a first parallel section 61, at least one inclined section 62 and at least one second parallel section 63, the first parallel section 61 and the second parallel section 63 are respectively parallel to the first bus bar 5, the distance between the second parallel section 63 and the first bus bar 5 is larger than the distance between the first parallel section 61 and the first bus bar 5, one end of each inclined section 62 is electrically connected with the second parallel section 63, the other end of each inclined section 62 is electrically connected with the first parallel section 61 or the other second parallel section 63, by providing the inclined sections 62 and the second parallel sections 63, the length of the metal wire 4 electrically connected with the inclined sections 62 and the second parallel sections 63 can be extended on the basis of ensuring the simple arrangement pattern of the metal wire 4, therefore, the heating power density of the corresponding area of the inclined section 62 and the second parallel section 63 is close to or equal to the heating power density of the corresponding area of the first parallel section 61, the requirements of quick defrosting and demisting are met, meanwhile, the local temperature caused by overlarge heating power density due to the local irregular shape of the glass can be avoided, the occurrence of undesirable phenomena such as deformation or distortion of the metal wire 4 due to the overhigh local temperature is reduced, and the whole heating temperature is uniform and the temperature difference is less than 5 ℃.

In fig. 1, the invention shows by way of example that the second busbar 6 has a first parallel section 61, a slanted section 62 and a second parallel section 63, the first parallel section 61 being located between the front edge 102 and the rear edge 103 and close to the majority of the area of the rear edge 103, the second parallel section 63 being located between the front edge 102 and the rear edge 103 and close to the area of the front edge 102 corresponding to the viewing mirror, the slanted section 62 being located between the first parallel section 61 and the second parallel section 63; wherein the area corresponding to the viewing mirror is located within about 200mm in the horizontal direction from the front edge 102. Specifically, the metal wires 4 electrically connected to the second parallel section 63 at one end are four metal wires L1, L2, L3 and L4, the metal wires 4 electrically connected to the inclined section 62 at one end are three metal wires L5, and the metal wires 4 electrically connected to the first parallel section 61 at one end are twenty-six metal wires L6.

As shown in fig. 4, each metal wire 4 has a first extending section 41, a second extending section 42 and at least one bent section 43, a bottom end of the first extending section 41 is electrically connected to the first bus bar 5 and extends toward the upper edge 100, a top end of the first extending section 41 is close to the upper edge 100, a bottom end of the second extending section 42 is electrically connected to the second bus bar 6 and extends toward the upper edge 100, a top end of the second extending section 42 is close to the upper edge 100, the second extending section 42 passes through the first bus bar 5 in an insulating manner, and a top end of the first extending section 41 is electrically connected to a top end of the second extending section 42 through the at least one bent section 43; the first extension 41 and the second extension 42 are substantially parallel to each other, and more preferably the first extension 41 and the second extension 42 are also parallel to the front edge 102.

In order to ensure that the view of the rear view mirror through the heated glass of the side window of the automobile is not obstructed, it is preferable that the metal wire 4 electrically connected to the second parallel section 63 at one end has only one bent section 43, and it is more preferable that the metal wire 4 electrically connected to the inclined section 62 at one end also has only one bent section 43; the metal wire 4, one end of which is electrically connected to the first parallel section 61, may have one bent section 43, or may have two or more bent sections 43; the number of the bending sections 43 of each metal wire 4 can be reduced, the arrangement structure that the metal wires 4 are roundabout for many times is avoided, the attractive effect of neat appearance is achieved, the wire distribution process is simple, the wire distribution process is suitable for automatic wire distribution processes such as manipulators, and the production efficiency is improved.

In fig. 1 and 4, a distance between the first extension 41 and the second extension 42 of the metal wire 4 electrically connected to the second parallel section 63 is greater than or equal to a distance between the first extension 41 and the second extension 42 of the metal wire 4 electrically connected to the inclined section 62, and a distance between the first extension 41 and the second extension 42 of the metal wire 4 electrically connected to the inclined section 62 is greater than a distance between the first extension 41 and the second extension 42 of the metal wire 4 electrically connected to the first parallel section 61. Fig. 1 also shows that the distance between the first and

second extensions

41 and 42 of the metal wire L1 is greater than the distance between the first and

second extensions

41 and 42 of the metal wire L2, the distance between the first and

second extensions

41 and 42 of the metal wire L2 is greater than the distance between the first and

second extensions

41 and 42 of the metal wire L3, the distance between the first and

second extensions

41 and 42 of the metal wire L3 is greater than the distance between the first and

second extensions

41 and 42 of the metal wire L4, the distance between the first and

second extensions

41 and 42 of the metal wire L4 is greater than or equal to the distance between the first and

second extensions

41 and 42 of the metal wire L5, the distance between the first and

second extensions

41 and 42 of one metal wire L5 is equal to the distance between the first and

second extensions

41 and 42 of another metal wire L5, the distance between the first and

second extensions

41 and 42 of the metal wire L5 is greater than the distance between the first and

second extensions

41 and 42 of the metal wire L6, and the distance between the first and

second extensions

41 and 42 of one metal wire L6 is equal to the distance between the first and

second extensions

41 and 42 of the other metal wire L6.

In fig. 4, the inclined section 62 and the first parallel section 61 have an included angle α in the range of 90 ° < α < 180 °, preferably 127 ° < α < 174 °, for example 162 °, which can achieve the effect of uniform heating over the whole surface and simplify the filament arrangement process. In the present invention, the metal wire 4 is preferably a copper wire, a tinned copper wire, a tungsten wire, an aluminum wire, a silver wire, or the like. The thickness of the first bus bar 5 and the second bus bar 6 is preferably 10-200 μm, more preferably 30-80 μm, such as 50 μm and 60 μm, so that the phenomenon of generating bubbles in the production process of the automobile side window heating glass can be eliminated; first busbar 5 and second busbar 6 can be silver thick liquid printing area andor metal foil, the metal foil can be copper foil, tinned copper foil, aluminium foil or nichrome foil etc. the both ends of metal conductor 4 can pass through modes such as solder welding or conductive adhesive bonding with first busbar 5 and second busbar 6 realize direct electrical contact. The first parallel section 61, the inclined section 62 and the second parallel section 63 of the second bus bar 6 may be made of the same material or different materials, for example, fig. 5 shows that the first parallel section 61 is a single metal foil, the inclined section 62 is a printed silver paste tape, and the second parallel section 63 is a single metal foil; fig. 6 shows that the first parallel section 61 is a metal foil and a printing silver paste strip, the inclined section 62 is a printing silver paste strip, the second parallel section 63 is a metal foil and a printing silver paste strip, and one end of the metal wire 4 electrically connected to the first parallel section 61 and the second parallel section 63 is fixed between the metal foil and the printing silver paste strip; fig. 7 shows that the first parallel section 61 is a double metal foil, the inclined section 62 is a metal foil and a printed silver paste tape, the second parallel section 63 is a double metal foil, one end of the metal wire 4 electrically connected to the first and second

parallel sections

61 and 63 is fixed between the double metal foils, and one end of the metal wire 4 electrically connected to the inclined section 62 is fixed between the metal foil and the printed silver paste tape.

Examples

The present invention arranged metal wires 4 on a thermoplastic interlayer 2 according to the shape of fig. 1, and provided a first bus bar 5 and a second bus bar 6 according to fig. 1, resulted in an automotive sidelight heating glass of example 1.

The present invention arranges the metal wires 4 on the thermoplastic intermediate layer 2 according to the shape of fig. 1, the only difference from example 1 being that the first bus bar 5 and the second bus bar 6 are always disposed in parallel to each other, resulting in the automotive sidelight heating glass of comparative example 1.

The present invention defines the region heated by the metal wire 4 electrically connected to the first parallel section 61 as region 1, the region heated by the metal wire 4 electrically connected to the inclined section 62 as region 2, and the region heated by the metal wire 4 electrically connected to the second parallel section 63 as region 3.

The heating power density of different areas was measured and calculated after the power supply provided 12V, the results are shown in table 1:

table 1: heating power density of zones 1-3

Heating zone	Region 1	Region 2	Region 3
				Comparative example 1 (Power density W/square meter)	883	709	934
Example 1 (Power density W/square meter)	774	796	802

According to the results in table 1, the automotive side window heating glass of the present invention can completely defrost the rear view mirror region after 15 minutes, the entire defrost region is equal to or more than 80% after about 20 minutes, and complete defrost is achieved after 30 minutes.

As can be seen from table 1, with the arrangement of the first bus bar 5 and the second bus bar 6 of example 1, the heating power density of the zone 2 can be significantly increased, the heating power densities of the zone 1 and the zone 3 can be reduced, and the ratio of the maximum power density to the minimum power density is greater than 1 and less than or equal to 1.05, so that the heating temperature is uniform over the whole area. Meanwhile, the area 3 of the embodiment 1 corresponds to the area for observing the rearview mirror, namely the heating temperature of the area for observing the rearview mirror is higher, the defrosting and demisting in advance are facilitated, the safety is ensured, the temperature difference between the heating temperature and the heating temperature of other areas is not more than 5 ℃, the heating temperature of the whole area is ensured to be uniform, and the temperature of deformation and distortion of the metal wire caused by overhigh local heating temperature is eliminated.

Although the present invention has been described in detail with reference to the foregoing preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A heating glass for the side window of car is composed of an external glass plate, a thermoplastic intermediate layer between said external and internal glass plates, at least three metal wires are embedded in the thermoplastic interlayer, a first bus bar and a second bus bar are arranged between the outer glass plate and the inner glass plate, the first and second bus bars being disposed proximate the lower edge and extending between the front and rear edges, the second bus bar is positioned between the first bus bar and the lower edge, two ends of each metal wire are respectively electrically connected with the first bus bar and the second bus bar, each metal wire extends between the upper edge and the second bus bar and at least partially passes through the first bus bar in an insulated way; the method is characterized in that: the second bus bar includes a first parallel section, at least one inclined section, and at least one second parallel section, the first parallel section and the second parallel section are respectively parallel to the first bus bar, the distance between the second parallel section and the first bus bar is greater than the distance between the first parallel section and the first bus bar, one end of each inclined section is electrically connected to the second parallel section, and the other end of each inclined section is electrically connected to the first parallel section or the other second parallel section;

each metal wire is provided with a first extending section, a second extending section and at least one bent section, the bottom end of the first extending section is electrically connected with the first bus bar and extends towards the upper edge, the bottom end of the second extending section is electrically connected with the second bus bar and extends towards the upper edge, the second extending section penetrates through the first bus bar in an insulating mode, and the top end of the first extending section is electrically connected with the top end of the second extending section through the at least one bent section;

the distance between the first extension and the second extension of one of the metal wires electrically connected with the second parallel section, which is close to the front edge, is greater than the distance between the first extension and the second extension of one of the metal wires electrically connected with the second parallel section, which is far from the front edge.

2. The automotive sidelite heating glass of claim 1, wherein: the automobile side window heating glass is arranged at an opening of an automobile body, and the automobile side window heating glass can do lifting movement in the opening.

3. The automotive sidelite heating glass of claim 1, wherein: the heating power density of the area heated by the metal wire electrically connected with the second parallel section is greater than that of the area heated by the metal wire electrically connected with the inclined section, and the heating power density of the area heated by the metal wire electrically connected with the inclined section is greater than or equal to that of the area heated by the metal wire electrically connected with the first parallel section.

4. The automotive sidelite heating glass of claim 1, wherein: the ratio of the maximum power density to the minimum power density of the metal wire heating is greater than 1 and less than or equal to 1.05.

5. The automotive sidelite heating glass of claim 1, wherein: the second parallel section is located within 200mm in the horizontal direction from the front edge.

6. The automotive sidelite heating glass of claim 1, wherein: the first and second extensions are parallel to each other, the first extension being parallel to the front edge.

7. The automotive sidelite heating glass of claim 1, wherein: wherein the metal wire with one end electrically connected with the second parallel section only has one bending section.

8. The automotive sidelite heating glass of claim 1, wherein: the distance between the first extending section and the second extending section of the metal wire electrically connected with the second parallel section is larger than or equal to the distance between the first extending section and the second extending section of the metal wire electrically connected with the inclined section, and the distance between the first extending section and the second extending section of the metal wire electrically connected with the inclined section is larger than the distance between the first extending section and the second extending section of the metal wire electrically connected with the first parallel section.

9. The automotive sidelite heating glass of claim 1, wherein: the inclined section and the first parallel section form an included angle alpha, and the included angle alpha ranges from 90 degrees to alpha to 180 degrees.

10. The automotive sidelite heating glass of claim 1, wherein: the inclined section and the first parallel section form an included angle alpha, and the included angle alpha ranges from 127 degrees to 174 degrees.

11. The automotive sidelite heating glass of claim 1, wherein: the thickness of the first bus bar and the second bus bar is 10-200 mu m.

12. The automotive sidelite heating glass of claim 1, wherein: the material of the first and second parallel sections comprises at least one sheet of metal foil and the material of the oblique sections comprises a printed silver paste strip.

13. The automotive sidelite heating glass of claim 1, wherein: the thermoplastic middle layer comprises two layers of outer resin films and at least one layer of middle resin film, the hardness of the middle resin film is smaller than that of the outer resin films, the metal wire is embedded in one of the outer resin films, and the distance between the metal wire and the nearest layer of middle resin film is 0.25-0.4 mm.