CA1176677A - Electric heater plate - Google Patents
Electric heater plateInfo
- Publication number
- CA1176677A CA1176677A CA000387716A CA387716A CA1176677A CA 1176677 A CA1176677 A CA 1176677A CA 000387716 A CA000387716 A CA 000387716A CA 387716 A CA387716 A CA 387716A CA 1176677 A CA1176677 A CA 1176677A
- Authority
- CA
- Canada
- Prior art keywords
- portions
- glass sheet
- electrically nonconductive
- nonconductive coating
- electrically
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
There is disclosed herein an electric heater plate which is formed on a ceramic substrate such as a glass sheet. A nonconductive coating overlies at least a portion of a surface of the ceramic substrate. This nonconductive coating has at least one open area therein in which the surface of the ceramic substrate is exposed. A conductive coating overlies at least a portion of the nonconductive coating and at least a portion of the surface of the ceramic substrate exposed by the open area formed in the nonconductive coating. A conductor is bonded to the conductive coating at the location where the conductive coating overlies the surface of the ceramic substrate exposed by the open area formed in the nonconductive coating. This provides a stronger bond than can be achieved if the bond is made to the conductive coating in a location overlying the nonconductive coating.
There is disclosed herein an electric heater plate which is formed on a ceramic substrate such as a glass sheet. A nonconductive coating overlies at least a portion of a surface of the ceramic substrate. This nonconductive coating has at least one open area therein in which the surface of the ceramic substrate is exposed. A conductive coating overlies at least a portion of the nonconductive coating and at least a portion of the surface of the ceramic substrate exposed by the open area formed in the nonconductive coating. A conductor is bonded to the conductive coating at the location where the conductive coating overlies the surface of the ceramic substrate exposed by the open area formed in the nonconductive coating. This provides a stronger bond than can be achieved if the bond is made to the conductive coating in a location overlying the nonconductive coating.
Description
1 ~7667'~
ELEC~RIC HE~TER PLATE
~ he present invention relates to an electric heate:r plate.
A general understanding can be obtained of ~he S construction of electric heater pla~es by reading U,S.
patent 4,137,447 which issued on January 30, 1979. These ele~ric heater plates are par~icularly useful as a back-lite in a motor vehicle. Under fogging or icing condi-tions, curr~nt is run through the electrical heater plate 10 to defog or deice the same thereby providing a clear window in ~he rear of a vehicle. In fact, New Yor~ State pre-sently requires that all vehicles sold in that State to be equipped with such a device.
No search was conducted on the subj ect matter of 15 this specification in the U.S. Patent Office or any other search facility.We are unaware of any prior art more relevant to the subject matter of this specification than that which will be set forth hereinbelow.
Also known at the time of the invention described 20 in this specification is an electric- heater plat~ 10, such as ~hown in Figures 1 and 2 of the drawings. Such an elec-~rical heater plate 10 is used in vehicles manufactured by the Ford Motor Company which are equipped with electrically hea~ed backlitesO In particular, the electrical heater 25 plate is formed from a base which is a glass sheet 12. The glass sheet has an opaque, nonconductive coating 14 which, in the embodiment shown in Figure 1, extends around the entire perimeter of the glass sheet 12. The purpose of this opaque, nonconductive coating is to provide a sigh~
30 shield for lending more uniform characteristics to the appear~nce of the tempered glass sheet when viewed fr~m 1 178~77 the opposite side of the vehicle. The opaque, non-conductive coating is used to block out the color developed by a layer of silver ceramic material which is used to form the terminal areas for the electrically heated grid lines on the electric heater plate 10. The opaque coating also shields and protects the adhesive system used to mount the backlite from direct sunlight. The color of the opaque, nonconductive coating can be judiciously selected to give a better color coordination with the exterior color of the automotive vehicle in which the heater plate is to be installed.
In a single operation, a plurality of thin lines 16-16 and larger terminal areas 18-18 are printed on the glass sheet 12 using a silver ceramic material. The thin lines 16-16 are printed on the surface of the glass sheet 12 and the terminal areas 18-18 are printed on the opaque, nonconductive coating 14. In effect then, the opaque, nonconductive coating 14 is used as a sight shield to block a view of the enlarged terminal areas 18-18 when one views the electric heater plate 10 from the surface which does not have printed material thereon. A conductor strip ~0 is soldered at locations identified by the numerals 22-22 to the enlarged terminal areas 18-18.
While the drawings in this case show only the left hand side of the article being manuactured, it is obvious that the right hand side of the same article is being manufactured in the same manner. In this manner, a pair of electrical leads are provided to the glass sheet so that an interconnection may be made by these leads to an electrical circuit, now shown, which provides the power to the thin lines 16-16, which in turn provides heat to the glass sheet in order to deice or defog the same.
Certain difficulties have been encountered in manufacturing electric heater plates in accordance with the above description. As described above, the conductive silver ceramic for the terminal areas has been applied -- 3 ~
directly over the opaque, nonconductive ceramic coatings.
There is a defini~e mismatch of the expansion coefficients between these two materials when the bac}clite is heated, forme~ and quenched. This results in a weak solder bond o 5 the conductor strip to the silver c~ramic coating. Al~o, a certain porosity can be developed in the curing and firing of the opaque, non onductive ceramic coating and the overlying silver ceramic coating because of an outgassing of an organic portion of the opaque, nonconductive ceramic coa~ing. The increased porosity of the silver ceramic coating also results in a weakeni~g of the bond between the silver ceramic coating and the opaque, nonconductiv~
coatlng as well as the solder joint between the conductor strip and the terminal areas formed by the silver ceramic material.
This invention relate~ to an electric heater plate and, more particularly, to an electric heater plate which finds principal use as an electrically heated backlite in a mo~or vehicle. The bac~lite is heated in order to defrost or defog the same~
In accordance with this invention, an electrically heated backlite is constructed in the following manner.
A glass sheet is used as the substrate for the electrically heated backlite. This glass sheet has an inner surface which will face the interior of a vehicle when in an installed position. The glass sheet also has an outer surface which will face the exterior of the vehicle when in an installed position.
An opaque, electrically nonconductive coating is bonded to at least two portions of the inner surface of the glass sheet. The two portions of the electrically non-conductive coating are spaced apart from one another on the inner surface of the glass sheet. Each of the portions has atleast one open area formed therein in which the inner surface of the glass sheet is exposed.
B ~ '7 ~ n electrical resistance heater line having spaced terminal ends is bonded over a majority of its bonding surface area to the inner surface of the glass sheet. The heater line extends in a length dimension from one of the portions of the electrically nonconductive coating to the other of the portions of the electrically nonconductive coating.
first of the terminal ends of the heater line (1) overlies and is bonded to at least one of the portions of the electrically nonconductive coating, and (2) overlies and is bonded to all of the inner surface of the glass sheet exposed in the open area formed in the one of the portions of the electrically nonconductive coating. The second of the terminal ends of the heater line (1) overlies and is bonded to at least a part of the other of the portions of the electrically nonconductive coating, and (2) overlies and is bonded to all of the inner surface of the glass sheet exposed in the open area formed in the other of the portions of the elec-trically r~onconductive coating. The bond formed between the terminal ends and the inner surface of the glass sheet is stronger than the bond between that portion of the terminal end which is bonded to the portion-of the electrically noncon-ductive coating.
At least a pair of electrical conductors are providedO
Bonds are formed to bond individual ones of the conductors to one of the terminal ends of the heater line at a location where the terminal end overlies the inner surface of the glass sheet exposed by the open area of the portion of elec-trically nonconductive coating.
The open area of the electrically nonconductive coating which exposes the inner surface of the glass sheet may be completely open or may be formed in one of many different patterns, for example, a plurality of elongated slots, a plurality of small square openings or a plurality of small circular openings.
The novel features that are considered characteris-tic of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and its method of operation, together with advantages thereof, will best be understood from the 1~6~7'7 followlng description of specific embodiments when read in connection with the accompanying drawings, wherein like refer~nce characters indicate like parts throughout the several figures, and in which:
Figures 1 and 2 are drawings which depict the prior art known in this area which has been described in detail above~;
Figure 3 is an elevation view of an electric heater plate con~tructed in accordanc~ wi~h the ~eachings 10 of ~his invention; and Figure 4 is an enlarged cross-section view ~aken along llne IV-IV of Figure 3.
.. . . ... .
In Figures 3 and 4 there is shown an electrical heater plate formed in accordance with the teachings of 15 this invention. ~hese figures show only the left side of an electric heater plate which in this preferred embo-diment will be an 21ectrically heated backlite for a motor vehicle. The right side of the electricall~ heated backlite is formed in a similar manner as the left side so that an electrical potential may be applied across the backlite in order to defog or defrost the same.
In accordance with ths teachings of this inven-tion, an electrically heated backlite, generally desi~nated 25 by the numeral 30, is formed on a glass sheet 32. Th~
~lass sheet is made and cut to size by methods well kno~-~in the art, so no further description thereof will be undertaken herein. An opaque, nonconductive coating 34 is provided, in the case of the e7ectrically heated backlite 30 30 of the preferred construction, around substantially the ~ 17667 ~
entire perimeter of the backlite. This opaque, noncon-ductive coating is formed by silk screen printing a black ceramic paste,such as paste#24-1802 manufactured by Ace Drakenfeld Co~, on the glass sheet 32. This opaque, nonconductive coating 34 is then dried so that it will not smear. As is best seen in Figure 4, open areas 36-36 are provided for purposes which will hereafter be described.
After the opaque, nonconductive coating 34 has been dried on the glass sheet 32, a second silk screen printing operation takes place to place a conductive silver ceramic paste on the electrically heated backlite 30. This silver ceramic paste forms thin grid lines 38-38 and a plurality of terminal areas 40-40. The uppermost terminal areas 40-40 shown in Figure 3 each are used to interconnect a plurality of the thin grid lines 38-38. The materials for use in this operation are discussed in detail in my aforementioned patent, so no further discussion thereof will be undertaken herein. The terminal areas 40-40 also overlie in part the opaque, nonconductive coating 34 and also in part an a~sociated one of the open areas 36-36 of the opaque, nonconductive coating. This is illustrated best in Figure 4.
~ fter the silver ceramic paste has been applied to form the thin grid lines 38-38 and the terminal areas 40-40, the entire unit is then placed on a suitable fixture and sent through a glass tempering lehr in which the glass is heated to a temperature of about 650C. During this heating process, the opaque, nonconductive coating and the thin grid lines 38-38 and terminal areas 40-40 are cured~
In the case of the opaque, nonconductive coating 34, it becomes thoroughly bonded to the surface of the glass sheet 32. In the case of the thin grid lines 38-38, they are bonded over their length to the surface of the glass sheet 32. In the case of the terminal areas 40-40, they are in a 1 ~7~7'~
small part adhered to the opaque, nonconductive coating 34, but mainly are bonded to the sur~ace of the glass sheet 32 in the locations where the open areas 36-36 are locatedO
After the glass sheet 32 has been heated throughout its entire extent, the entire glass sheet is rapidly quenched in order to temper the same.
After the tempering operation, a conductor strip 42 is solder bonded by means of solder 44, shown only in Figure 4, to the terminal areas 40-40 of the electrically heated backlite 30. The solder bonding is carried out only in those areas of the terminal areas 40-40 which overlie the open areas 36-36 of the opaque, nonconductive coating.
The solder bonding is accomplished in these areas because a stronger solder junction can be achieved between the terminal area supported directly on the glass sheet 32 than on areas of the terminal area which would be supported on the opaque, nonconductive coating 34. The reason that the junction is better is the absence of a third material with a different coefficient of expansion between the conductive layer and the base glass.
To make the electrically heated backlite 30 functional, electrical connection is made from the lower terminal area 40 on both sides of the backlite, only the left one being shown in the drawings, to the electrical generation system of the motor vehicle. This generation system provides the potential which when actuated causes a flow of current through the thin grid lines and the re-sultant resistance heating of the electrically heated backlite 30 to cause a defogging or deicing thereof. The manner of connecting and using such electrically heated backlites is well known in the art, as is evidenced by the many millions of vehicles currently on the road which have such systems installed therein.
67~
While particular embodiments of the invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the invention and it is intended to cover in the appended all such modifications and equivalents as fall within the true spirit and scope of this invention.
ELEC~RIC HE~TER PLATE
~ he present invention relates to an electric heate:r plate.
A general understanding can be obtained of ~he S construction of electric heater pla~es by reading U,S.
patent 4,137,447 which issued on January 30, 1979. These ele~ric heater plates are par~icularly useful as a back-lite in a motor vehicle. Under fogging or icing condi-tions, curr~nt is run through the electrical heater plate 10 to defog or deice the same thereby providing a clear window in ~he rear of a vehicle. In fact, New Yor~ State pre-sently requires that all vehicles sold in that State to be equipped with such a device.
No search was conducted on the subj ect matter of 15 this specification in the U.S. Patent Office or any other search facility.We are unaware of any prior art more relevant to the subject matter of this specification than that which will be set forth hereinbelow.
Also known at the time of the invention described 20 in this specification is an electric- heater plat~ 10, such as ~hown in Figures 1 and 2 of the drawings. Such an elec-~rical heater plate 10 is used in vehicles manufactured by the Ford Motor Company which are equipped with electrically hea~ed backlitesO In particular, the electrical heater 25 plate is formed from a base which is a glass sheet 12. The glass sheet has an opaque, nonconductive coating 14 which, in the embodiment shown in Figure 1, extends around the entire perimeter of the glass sheet 12. The purpose of this opaque, nonconductive coating is to provide a sigh~
30 shield for lending more uniform characteristics to the appear~nce of the tempered glass sheet when viewed fr~m 1 178~77 the opposite side of the vehicle. The opaque, non-conductive coating is used to block out the color developed by a layer of silver ceramic material which is used to form the terminal areas for the electrically heated grid lines on the electric heater plate 10. The opaque coating also shields and protects the adhesive system used to mount the backlite from direct sunlight. The color of the opaque, nonconductive coating can be judiciously selected to give a better color coordination with the exterior color of the automotive vehicle in which the heater plate is to be installed.
In a single operation, a plurality of thin lines 16-16 and larger terminal areas 18-18 are printed on the glass sheet 12 using a silver ceramic material. The thin lines 16-16 are printed on the surface of the glass sheet 12 and the terminal areas 18-18 are printed on the opaque, nonconductive coating 14. In effect then, the opaque, nonconductive coating 14 is used as a sight shield to block a view of the enlarged terminal areas 18-18 when one views the electric heater plate 10 from the surface which does not have printed material thereon. A conductor strip ~0 is soldered at locations identified by the numerals 22-22 to the enlarged terminal areas 18-18.
While the drawings in this case show only the left hand side of the article being manuactured, it is obvious that the right hand side of the same article is being manufactured in the same manner. In this manner, a pair of electrical leads are provided to the glass sheet so that an interconnection may be made by these leads to an electrical circuit, now shown, which provides the power to the thin lines 16-16, which in turn provides heat to the glass sheet in order to deice or defog the same.
Certain difficulties have been encountered in manufacturing electric heater plates in accordance with the above description. As described above, the conductive silver ceramic for the terminal areas has been applied -- 3 ~
directly over the opaque, nonconductive ceramic coatings.
There is a defini~e mismatch of the expansion coefficients between these two materials when the bac}clite is heated, forme~ and quenched. This results in a weak solder bond o 5 the conductor strip to the silver c~ramic coating. Al~o, a certain porosity can be developed in the curing and firing of the opaque, non onductive ceramic coating and the overlying silver ceramic coating because of an outgassing of an organic portion of the opaque, nonconductive ceramic coa~ing. The increased porosity of the silver ceramic coating also results in a weakeni~g of the bond between the silver ceramic coating and the opaque, nonconductiv~
coatlng as well as the solder joint between the conductor strip and the terminal areas formed by the silver ceramic material.
This invention relate~ to an electric heater plate and, more particularly, to an electric heater plate which finds principal use as an electrically heated backlite in a mo~or vehicle. The bac~lite is heated in order to defrost or defog the same~
In accordance with this invention, an electrically heated backlite is constructed in the following manner.
A glass sheet is used as the substrate for the electrically heated backlite. This glass sheet has an inner surface which will face the interior of a vehicle when in an installed position. The glass sheet also has an outer surface which will face the exterior of the vehicle when in an installed position.
An opaque, electrically nonconductive coating is bonded to at least two portions of the inner surface of the glass sheet. The two portions of the electrically non-conductive coating are spaced apart from one another on the inner surface of the glass sheet. Each of the portions has atleast one open area formed therein in which the inner surface of the glass sheet is exposed.
B ~ '7 ~ n electrical resistance heater line having spaced terminal ends is bonded over a majority of its bonding surface area to the inner surface of the glass sheet. The heater line extends in a length dimension from one of the portions of the electrically nonconductive coating to the other of the portions of the electrically nonconductive coating.
first of the terminal ends of the heater line (1) overlies and is bonded to at least one of the portions of the electrically nonconductive coating, and (2) overlies and is bonded to all of the inner surface of the glass sheet exposed in the open area formed in the one of the portions of the electrically nonconductive coating. The second of the terminal ends of the heater line (1) overlies and is bonded to at least a part of the other of the portions of the electrically nonconductive coating, and (2) overlies and is bonded to all of the inner surface of the glass sheet exposed in the open area formed in the other of the portions of the elec-trically r~onconductive coating. The bond formed between the terminal ends and the inner surface of the glass sheet is stronger than the bond between that portion of the terminal end which is bonded to the portion-of the electrically noncon-ductive coating.
At least a pair of electrical conductors are providedO
Bonds are formed to bond individual ones of the conductors to one of the terminal ends of the heater line at a location where the terminal end overlies the inner surface of the glass sheet exposed by the open area of the portion of elec-trically nonconductive coating.
The open area of the electrically nonconductive coating which exposes the inner surface of the glass sheet may be completely open or may be formed in one of many different patterns, for example, a plurality of elongated slots, a plurality of small square openings or a plurality of small circular openings.
The novel features that are considered characteris-tic of the invention are set forth with particularity in the appended claims. The invention itself, however, both as to its organization and its method of operation, together with advantages thereof, will best be understood from the 1~6~7'7 followlng description of specific embodiments when read in connection with the accompanying drawings, wherein like refer~nce characters indicate like parts throughout the several figures, and in which:
Figures 1 and 2 are drawings which depict the prior art known in this area which has been described in detail above~;
Figure 3 is an elevation view of an electric heater plate con~tructed in accordanc~ wi~h the ~eachings 10 of ~his invention; and Figure 4 is an enlarged cross-section view ~aken along llne IV-IV of Figure 3.
.. . . ... .
In Figures 3 and 4 there is shown an electrical heater plate formed in accordance with the teachings of 15 this invention. ~hese figures show only the left side of an electric heater plate which in this preferred embo-diment will be an 21ectrically heated backlite for a motor vehicle. The right side of the electricall~ heated backlite is formed in a similar manner as the left side so that an electrical potential may be applied across the backlite in order to defog or defrost the same.
In accordance with ths teachings of this inven-tion, an electrically heated backlite, generally desi~nated 25 by the numeral 30, is formed on a glass sheet 32. Th~
~lass sheet is made and cut to size by methods well kno~-~in the art, so no further description thereof will be undertaken herein. An opaque, nonconductive coating 34 is provided, in the case of the e7ectrically heated backlite 30 30 of the preferred construction, around substantially the ~ 17667 ~
entire perimeter of the backlite. This opaque, noncon-ductive coating is formed by silk screen printing a black ceramic paste,such as paste#24-1802 manufactured by Ace Drakenfeld Co~, on the glass sheet 32. This opaque, nonconductive coating 34 is then dried so that it will not smear. As is best seen in Figure 4, open areas 36-36 are provided for purposes which will hereafter be described.
After the opaque, nonconductive coating 34 has been dried on the glass sheet 32, a second silk screen printing operation takes place to place a conductive silver ceramic paste on the electrically heated backlite 30. This silver ceramic paste forms thin grid lines 38-38 and a plurality of terminal areas 40-40. The uppermost terminal areas 40-40 shown in Figure 3 each are used to interconnect a plurality of the thin grid lines 38-38. The materials for use in this operation are discussed in detail in my aforementioned patent, so no further discussion thereof will be undertaken herein. The terminal areas 40-40 also overlie in part the opaque, nonconductive coating 34 and also in part an a~sociated one of the open areas 36-36 of the opaque, nonconductive coating. This is illustrated best in Figure 4.
~ fter the silver ceramic paste has been applied to form the thin grid lines 38-38 and the terminal areas 40-40, the entire unit is then placed on a suitable fixture and sent through a glass tempering lehr in which the glass is heated to a temperature of about 650C. During this heating process, the opaque, nonconductive coating and the thin grid lines 38-38 and terminal areas 40-40 are cured~
In the case of the opaque, nonconductive coating 34, it becomes thoroughly bonded to the surface of the glass sheet 32. In the case of the thin grid lines 38-38, they are bonded over their length to the surface of the glass sheet 32. In the case of the terminal areas 40-40, they are in a 1 ~7~7'~
small part adhered to the opaque, nonconductive coating 34, but mainly are bonded to the sur~ace of the glass sheet 32 in the locations where the open areas 36-36 are locatedO
After the glass sheet 32 has been heated throughout its entire extent, the entire glass sheet is rapidly quenched in order to temper the same.
After the tempering operation, a conductor strip 42 is solder bonded by means of solder 44, shown only in Figure 4, to the terminal areas 40-40 of the electrically heated backlite 30. The solder bonding is carried out only in those areas of the terminal areas 40-40 which overlie the open areas 36-36 of the opaque, nonconductive coating.
The solder bonding is accomplished in these areas because a stronger solder junction can be achieved between the terminal area supported directly on the glass sheet 32 than on areas of the terminal area which would be supported on the opaque, nonconductive coating 34. The reason that the junction is better is the absence of a third material with a different coefficient of expansion between the conductive layer and the base glass.
To make the electrically heated backlite 30 functional, electrical connection is made from the lower terminal area 40 on both sides of the backlite, only the left one being shown in the drawings, to the electrical generation system of the motor vehicle. This generation system provides the potential which when actuated causes a flow of current through the thin grid lines and the re-sultant resistance heating of the electrically heated backlite 30 to cause a defogging or deicing thereof. The manner of connecting and using such electrically heated backlites is well known in the art, as is evidenced by the many millions of vehicles currently on the road which have such systems installed therein.
67~
While particular embodiments of the invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the invention and it is intended to cover in the appended all such modifications and equivalents as fall within the true spirit and scope of this invention.
Claims (12)
1. In an electrically heated backlite of the type formed on a glass sheet having an inner surface which will face the interior of a vehicle when in an installed position and an outer surface which will face the exterior of the vehicle when in an installed position, the improvement com-prising:
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions of said electrically nonconductive coating having at least one open area formed therein in which said inner surface of said glass sheet is exposed;
an electrical resistance heater line having spaced terminal ends, said heater line being bonded over a majority of its bonding surface area to said inner surface of said glass sheet, said heater line extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating, one of said terminal ends of said heater line (1) overlying and bonded to at least part of one of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said portions of said electrically noncon-ductive coating, said other of said terminal ends of said heater line (1) overlying and bonded to at least part of said other of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said other of said portions of said electrically nonconduc-tive coating, said bond between said terminal ends and said inner surface of said glass sheet being stronger than said bond between said terminal ends and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal ends of said heater line at said location where each of said terminal ends overlies said inner surface of said glass sheet exposed by said open area of said portion of electrically nonconductive coating which said terminal end overlies.
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions of said electrically nonconductive coating having at least one open area formed therein in which said inner surface of said glass sheet is exposed;
an electrical resistance heater line having spaced terminal ends, said heater line being bonded over a majority of its bonding surface area to said inner surface of said glass sheet, said heater line extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating, one of said terminal ends of said heater line (1) overlying and bonded to at least part of one of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said portions of said electrically noncon-ductive coating, said other of said terminal ends of said heater line (1) overlying and bonded to at least part of said other of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said other of said portions of said electrically nonconduc-tive coating, said bond between said terminal ends and said inner surface of said glass sheet being stronger than said bond between said terminal ends and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal ends of said heater line at said location where each of said terminal ends overlies said inner surface of said glass sheet exposed by said open area of said portion of electrically nonconductive coating which said terminal end overlies.
2. The electrically heated backlite of claim 1, wherein said two portions of said opaque, electrically nonconductive coating are opposite side edges of a continuous band which extends around the entire inner face of said glass sheet at or near the edge of said glass sheet.
3. The electrically heated backlite of claim 1 or 2, wherein each of said open areas formed in said portions of said electrically nonconductive coating is a single open area.
4. The electrically heated backlite of claim 1 or 2, wherein each of said open areas formed in said positions of said electrically nonconductive coating is formed by a plurality of closely spaced open areas.
5. In an electrically heated backlite of the type formed on a glass sheet having an inner surface which will face the interior of a vehicle when in an installed position and an outer surface which will face the exterior of the vehicle when in an installed position, the improvement com-prising:
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions, of said electrically nonconductive coating having at least one open area formed therein in which said inner.
surface of said glass sheet is exposed;
a plurality of electrical resistance heater lines having spaced ends, said heater lines being bonded over a majority of their bonding surface area to said inner surface of said glass sheet, said heater lines extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating;
at least a pair of terminal areas, one of said terminal areas interconnecting said ends of said terminal lines extending toward each of said portions of said electrically nonconductive material, each one of said terminal areas also (1) overlying and bonded to at least part of one of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said portions of said electrically nonconductive coating, said other of said terminal areas (1) overlying and bonded to at least a part of said other of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said other of said portions of said electrically nonconductive coating, said bond between said terminal areas and said inner surface of said glass sheet being stronger than said bond between said terminal areas and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal areas for said heater lines at said location where each of said terminal areas overlies said inner surface of said glass sheet exposed by said open area of said portion of electrically nonconductive coating which said terminal area overlies.
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions, of said electrically nonconductive coating having at least one open area formed therein in which said inner.
surface of said glass sheet is exposed;
a plurality of electrical resistance heater lines having spaced ends, said heater lines being bonded over a majority of their bonding surface area to said inner surface of said glass sheet, said heater lines extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating;
at least a pair of terminal areas, one of said terminal areas interconnecting said ends of said terminal lines extending toward each of said portions of said electrically nonconductive material, each one of said terminal areas also (1) overlying and bonded to at least part of one of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said portions of said electrically nonconductive coating, said other of said terminal areas (1) overlying and bonded to at least a part of said other of said portions of said electrically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said other of said portions of said electrically nonconductive coating, said bond between said terminal areas and said inner surface of said glass sheet being stronger than said bond between said terminal areas and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal areas for said heater lines at said location where each of said terminal areas overlies said inner surface of said glass sheet exposed by said open area of said portion of electrically nonconductive coating which said terminal area overlies.
6. The electrically heated backlite of claim 5, wherein said two portions of said opaque, electrically nonconductive coating are opposite side edges of a continuous band which extends around the entire inner face of said glass sheet at or near the edge of said glass sheet.
7. The electrically heated backlite of claim 5 or 6, wherein each of said open areas formed in said portions of said electrically nonconductive coating is a single open area.
8. The electrically heated backlite of claim 5 or 6, wherein each of said open areas formed in said portions of said electrically nonconductive coating is formed by a plurality of closely spaced open areas.
9. In an electrically heated backlite of the type formed on a glass sheet having an inner surface which will face the interior of a vehicle when in an installed position and an outer surface which will face the exterior of the vehicle when in an installed position, the improvement com-prising:
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions of said electrically nonconductive coating having a plurality of open areas formed therein in which said inner surface of said glass sheet is exposed;
a plurality of electrical resistance heater lines having spaced ends, said heater lines being bonded over a majority of their bonding surface area to said inner surface of said glass sheet, said heater lines extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating;
a plurality of terminal areas equal in number to said plurality of said open areas, each of said terminal areas interconnecting said ends of said terminal lines extending toward one of said open areas in each of said portions of said electrically nonconductive material, each one of said terminal areas also (1) overlying and bonded to at least part of an associated one of said portions of said elec-trically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said associated portions of said electrically nonconductive coating, said bond between said terminal areas and said inner surface of said glass sheet being stronger than said bond between said terminal areas and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal areas for said heater lines on one portion of said electrically nonconductive material at said locations where each of said terminal areas overlies said inner surface of said glass sheet exposed by said open areas of said portion of electrically nonconductive coating which said terminal areas overlies.
an opaque, electrically nonconductive coating bonded to at least two portions of said inner face of said glass sheet, said two portions of said electrically nonconductive coating being spaced apart from one another on said inner surface of said glass sheet, each of said portions of said electrically nonconductive coating having a plurality of open areas formed therein in which said inner surface of said glass sheet is exposed;
a plurality of electrical resistance heater lines having spaced ends, said heater lines being bonded over a majority of their bonding surface area to said inner surface of said glass sheet, said heater lines extending in a length dimension from one of said portions of said electrically nonconductive coating to the other of said portions of said electrically nonconductive coating;
a plurality of terminal areas equal in number to said plurality of said open areas, each of said terminal areas interconnecting said ends of said terminal lines extending toward one of said open areas in each of said portions of said electrically nonconductive material, each one of said terminal areas also (1) overlying and bonded to at least part of an associated one of said portions of said elec-trically nonconductive coating, and (2) overlying and bonded to all of said inner surface of said glass sheet exposed in said open area formed in said one of said associated portions of said electrically nonconductive coating, said bond between said terminal areas and said inner surface of said glass sheet being stronger than said bond between said terminal areas and said portions of said electrically nonconductive coating;
at least a pair of electrical conductors;
bond means for bonding one of said conductors to each of said terminal areas for said heater lines on one portion of said electrically nonconductive material at said locations where each of said terminal areas overlies said inner surface of said glass sheet exposed by said open areas of said portion of electrically nonconductive coating which said terminal areas overlies.
10. The electrically heated backlite of claim 9, wherein said two portions of said opaque, electrically nonconductive coating are opposite side edges of a continuous band which extends around the entire inner face of said glass sheet at or near the edge of said glass sheet.
11. The electrically heated backlite of claim 9 or 10, wherein each of said open areas formed in said portions of said electrically nonconductive coating is a single open area.
12. The electrically heated backlite of claim 9 or 10, wherein each of said open areas formed in said portions of said electrically nonconductive coating is formed by a plurality of closely spaced open areas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US21436480A | 1980-12-08 | 1980-12-08 | |
| US214,364 | 1980-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1176677A true CA1176677A (en) | 1984-10-23 |
Family
ID=22798793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000387716A Expired CA1176677A (en) | 1980-12-08 | 1981-10-09 | Electric heater plate |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1176677A (en) |
| MX (1) | MX151013A (en) |
-
1981
- 1981-09-29 MX MX18939981A patent/MX151013A/en unknown
- 1981-10-09 CA CA000387716A patent/CA1176677A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| MX151013A (en) | 1984-09-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |