Patent Description:
A PCB board (Printed Circuit Board) generally includes an insulating layer and a conductive layer. In the conventional PCB board industry, the insulating layer is made of an organic material, and the organic material applied to the PCB board may include phenolic resin, glass fiber/ethoxyline resin, Polyimide, BT/Epoxy (ethoxyline resin) and so on. In general, an aluminum substrate or a glass fiber board is used as a substrate layer, the resin is used as an insulating layer and a copper foil is then layered on the insulating layer.

An insulating layer made by resin is the main reason for the warpage of the PCB board. The expansion and extending coefficient of the resin is large, and the deformation warp is easily generated. Even the deformation causes the conductive layer to peel off from the insulating layer, thereby affecting the performance of the PCB board.

In view of the above problems, the present disclosure is proposed to solve the above problem or at least partially solve the above problem.

The embodiment of the present disclosure provides a manufacturing method of a PCB board, and the manufacturing method of the PCB board includes:.

Further, the arranging the conductive wiring layer on the top surface of the glass substrate layer including:
printing a silver paste wiring by adopting a screen printed on the top surface of the glass substrate layer to form a conductive wiring layer.

Further, prior to the coating the non-transparent ink material layer on the bottom surface of the glass substrate layer, further including:
sintering the silver paste wiring.

Further, after the curing processing the white reflective ink material layer, further including:.

According to the manufacturing method of the PCB board provided by the embodiment of the third aspect of the present disclosure, since the glass substrate layer of the PCB board is used as the substrate and the insulating dielectric layer replacing the structure bonding a the aluminum substrate or the glass fiber board with the insulating resin in the prior art, and the expansion and extending coefficient of the glass is small, the deformation warp is not easily generated, and the conductive wiring layer is not easily peeled off from the insulating medium layer. Thereby, the use performance of the PCB board is improved. Since the glass may also have the function of dissipating heat, no additional heat radiation structure is required. Thereby, the heat dissipation structure may effectively save costs.

In order to describe the technical solutions in the embodiments of the present disclosure or the prior art more clearly, the drawings required to be used for descriptions about the embodiments or the prior art will be simply introduced below. It is apparent that the drawings described below are some embodiments of the present disclosure. Those of ordinary skill in the art may further obtain other drawings according to these drawings without creative work.

For making the purposes, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in combination with the drawings in the embodiments of the present disclosure. It is apparent that the described embodiments are not all embodiments but part of embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art on the basis of the embodiments in the present disclosure without creative work shall fall within the scope of protection of the present disclosure.

The word "comprising" as used throughout the description and claims is an open term and should be interpreted as "comprising but not limited to". "Substantially" means that within an acceptable error range, those skilled in the art will be able to solve the technical problems within a certain error range, basically achieving the technical effects.

In addition, the term "coupled" is used herein to include any direct and indirect electrical coupling means. Therefore, if it is described here that a first apparatus is coupled to a second apparatus, it is indicated that the first apparatus may be directly and electrically coupled to the second apparatus or indirectly and electrically coupled to the second apparatus through other apparatuses or coupling means. The description is described as an implementation mode for implementing the present disclosure. However, the description is intended to be illustrative of the general principle of the present disclosure, and is not intended to limit the scope of the present disclosure. The scope of protection of the present disclosure is subject to the definition of the appended claims.

It is to be understood that term "and/or" used in the present disclosure is only an association relationship describing associated objects and represents existence of three relationships. For example, A and/or B may represent three conditions, i.e., independent existence of A, coexistence of A and B and independent existence of B. In addition, character "/" in the present disclosure usually represents that previous and next associated objects form an "or" relationship.

Those skilled in the art may combine and grouping the different embodiments or examples described in the specification and the features of the different embodiments or examples without departing from the scope of the invention.

The mechanism of warpage of the PCB board caused in the prior art is as follows: the insulating dielectric layer of the conventional PCB board is made of an inorganic material, and the water content of the glass fiber cloth contained therein is an important factor causing warpage of the PCB board. Since the glass fiber cloth is water-absorbent, when the PCB board is wet, during the PCB board soldering process, the PCB board is deformed and warped due to high and low temperature during soldering.

In order to at least solve the above-mentioned series of problems causing the warpage of the PCB board, the embodiment of the disclosure provides a PCB board. Specifically, <FIG> is a side cross-sectional view of a PCB board according to Embodiment <NUM> of the present disclosure. The PCB board may be applied to various electronic devices, such as a lamp (such as a LED light), a mobile phone, a tablet computer, a notebook computer, a game console, and the like, or, be applied to some electrical devices on the car.

As shown in <FIG>, the PCB board in the present embodiment includes: an insulating dielectric layer <NUM>, a conductive wiring layer <NUM>, and a top ink layer <NUM>.

The insulating dielectric layer <NUM> is a glass substrate layer, and the glass substrate layer includes a top surface A and a bottom surface B which are disposed oppositely. The insulating dielectric layer <NUM> may select or process a preset size as the glass substrate layer. The glass substrate layer itself is a transparent material, and the light may be refracted through the transparent glass substrate layer.

The conductive wiring layer <NUM> is disposed on the top surface A of the insulating dielectric layer <NUM>. The top ink layer <NUM> is coated on the conductive wiring layer <NUM>. When the top ink layer <NUM> is coated, a preset position for pre-installing each electronic component (such as a light source, a resistor, a power source, etc.) may be preserved to connect each electronic component with the conductive wiring layer <NUM> by the preserved corresponding preset position.

In the present embodiment, a white reflective ink is used as the top ink layer <NUM>, which may be used as a solder resist on the one hand. On the other hand, when the PCB board is applied to a lamp, such as an LED lamp, the top ink layer <NUM> selects the white reflective ink layer, which may make the light incident from the light source be reflected by the white reflective ink layer. The light of the lamp may be reflected in the maximum extent, thereby greatly reducing the loss of light. Thereby preventing the light from being refracted through the transparent glass substrate layer, and the light efficiency of the lamp is improved. According to the PCB board provided the present embodiment, since the glass substrate layer is used as the substrate and the insulating dielectric layer replacing the structure bonding a the aluminum substrate or the glass fiber board with the insulating resin in the prior art, and the thermal conductivity of the glass fiber board is low, the lamp with high power and high power density is inapplicable therein; although the aluminum substrate possesses good thermal conductivity, may need to be in conjunction with insulating resins. Since the expansion and extending coefficient of the glass of the PCB board of the present embodiment is small, the deformation warp is not easily generated, and the conductive wiring layer is not easily peeled off from the insulating medium layer. Thereby, the use performance of the PCB board is improved. Since the glass may also have the function of dissipating heat, no additional heat radiation structure is required. Thereby, the heat dissipation structure may effectively save costs.

In addition, comparing to the manner that combine the aluminum substrate and the insulating resin in the prior art, the PCB board designed in the present embodiment replacing the aluminum substrate by the glass being used as the substrate, and making use of the characteristic of the glass processing both insulated and thermally conductive, may achieve the same effect achieved by the structure of combining the aluminum substrate and the insulating resin, without providing additional an insulating resin, and the cost is effectively saved.

The insulating resin is used as the insulating layer between the copper foil (the conductive wiring layer) in the PCB board and the aluminum substrate in the prior art. However, under high voltage and high temperature, the insulating resin is easily insulating failure, and only basic insulating can be met, which makes the PCB board easily insulating fails under high voltage and high temperature working condition, and fails to guarantee the stable performance of PCB board. In the PCB board of the present embodiment, since the insulating resin is not required, and the glass may achieve the insulating and heat dissipating effects without using the insulating resin, the problem of insulating failure will not happen. Furthermore, the amount of heat deformation of the glass substrate after tempering is much smaller than the amount of heat deformation of the aluminum substrate, which may effectively ensure the performance stability of the PCB board.

Furthermore, the crosstalk between different wires in the wiring is also less than the aluminum substrate in the prior art by using glass as the base material of the substrate, and its EMC (Electro Magnetic Compatibility) is better. The glass substrate has better insulating strength than the aluminum substrate. In the present embodiment, the glass substrate is used as the substrate of the PCB board, which solves the long-term unavoidable problem of the withstand voltage of the aluminum substrate. The existing aluminum substrate product only ensures the withstand voltage within 3KV without arcing when the heat dissipation creepage distance of <NUM> are ensured, and the glass substrate may achieve more than 5KV.

Based on the above embodiments, further, the PCB board of the present disclosure may further include: a bottom ink layer <NUM>, and the bottom ink layer <NUM> is coated on the bottom surface B of the insulating dielectric layer <NUM>. The bottom ink layer <NUM> is preferably a non-transparent ink layer. Specifically, the bottom ink layer <NUM> may be a black ink layer. When the PCB board in the present embodiment is mounted on the lamp, the bottom surface B may face the outside of the lamp. Since the substrate is a transparent glass substrate, the bottom surface B may be coated with for example a black non-transparent ink layer, which may effectively shield the electronic component and the conductive wire from appearance, thereby improving the aesthetic measure of the appearance.

The conductive wiring layer <NUM> is a silver paste wiring layer printed by silver paste. Specifically, the silver paste may be printed by a steel mesh. The silver paste is viscous slurry of a mechanical mixture consisted of high purity (<NUM>%) metallic silver particles, binders, solvents and auxiliaries. The size of silver particles on the insulating dielectric layer <NUM> is related to the conductivity of silver paste. Under the same volume, the particles are large, the contact probability between the particles is low, and a large space is left, which is occupied by the non-conductor resin, thereby forming a barrier to the conductor particles and lowering the conductivity. On the contrary, the contact probability of fine particles is improved, and the conductivity is better. The size of the particles has an effect on the conductivity. The size of the silver particles of the silver paste is controlled so that the conductive particles (silver particles) of the silver paste can smoothly pass through the mesh of the steel mesh and are densely deposited on the insulating dielectric layer <NUM> (the glass substrate layer), thereby forming a full conductive pattern and forming the silver paste wiring layer. In the PCB board of the present embodiment, the conductive wiring is directly applied on the glass substrate without disposing other insulating layer, thereby further reducing the manufacturing cost of the PCB board.

It is worth noting that the design of the trace of the conventional PCB board may also be a factor causing the warpage of the PCB board. When the trace of the PCB board is designed, due to some factors of the layout of electronic components and the function of electronic products, the trace of the PCB board may be uneven on the top layer and the bottom layer, for example, one side is a vertical wiring trace, and the other side is a horizontal wiring trace, or one side processing a large area of copper, and the other side processing no or a small amount of copper. The stretchability of the copper foil is different from that of the glass fiber cloth. When the copper foil on the surface of the PCB board is evenly distributed, the copper foil stretches the surface of the PCB board to cause distortion of the circuit board. In the present embodiment, the deformation of the PCB board can be more effectively prevented by the cooperation of the silver paste wiring and the glass substrate layer.

Further, a character layer <NUM> may also be printed on the top ink layer <NUM>, and the character layer <NUM> is cured. It can be understood that the character layer <NUM> is a printed character dispersedly arranged on the top ink layer <NUM>. The printed character may be located next to the electronic component soldered on the PCB board, to indicate the name of the corresponding electronic component.

In addition, when the PCB board in the present embodiment is applied to other fields, such as an electrical device on a car, the top ink layer <NUM> and the bottom ink layer <NUM> may be black ink layers, and the black ink layer may also be solder resist. The absorption coefficient of the black ink layer is higher than that of the white ink. Or when the PCB board in the present embodiment is applied to other fields, the top ink layer <NUM> and the bottom ink layer <NUM> may be other color ink layers being selected according to actual conditions.

The present example provides an electrical device, including the PCB board in Embodiment <NUM>. Specifically, the electrical device can be a lamp. <FIG> is a schematic structural diagram of a lamp according to an example of the present disclosure.

The view angle is a side cross-sectional view. As shown in <FIG>, the lamp of the embodiment further includes a light source <NUM>. The light source <NUM> is disposed on the top surface A of the PCB board <NUM>. The light source <NUM> is electrically connected to the conductive wiring layer. The light source <NUM> and the electronic component are attached to the glass substrate of the PCB board to form a direct heat dissipation, without the assistance of the heat-dissipating material such as the thermal grease. Comparing to the combination of the aluminum substrate + the heat sink in the prior art, the assembly uncertainty is reduced and is more environmental friendly.

Further, the transparent cover <NUM> and the lamp body <NUM> are further disposed. The transparent cover <NUM> is disposed opposite to the top surface A of the PCB board. The lamp body <NUM> is disposed between the transparent cover <NUM> and the PCB board <NUM> for connecting the transparent cover <NUM> and PCB board <NUM>. The transparent cover <NUM> has a spacing from the top surface A of the PCB board <NUM> to form a light-emitting cavity a. Preferably, the transparent cover <NUM> is a glass cover, or the transparent cover <NUM> is a transparent plastic cover.

As shown in <FIG>, the lamp body <NUM> can be a plastic member. When the lamp body <NUM> is a plastic member, the lamp body <NUM> can be detachably connected to the PCB board. For example, the lamp body <NUM> can be engaged with the PCB board <NUM>. The edge of the PCB board <NUM> is connected to the lamp body <NUM>. The intermediate position of the PCB board <NUM> is directly in contact with the air to dissipate heat. Since the PCB board <NUM> is made of glass as the substrate layer, the glass has good insulating and thermal conductivity, and is directly in contact with air to dissipate heat. There is no need to provide a heat sink to help to dissipate heat, and the cost is saved thereby.

As an alternative, as shown in <FIG>, the lamp body <NUM> can also be a glass member, and the lamp body <NUM> can be integrally formed with the glass substrate layer of the PCB board <NUM>, that is, the glass substrate layer of PCB board <NUM> doubles the light body. In the prior art, the assembly process between the PCB board and the lamp body of the lamp is complicated, and the lock screw and the coating the insulating thermal grease are required; the so called lamp body of the lamp is a heat sink connected to the PCB board, and the connecting between the PCB board combining the aluminum substrate and the insulating resin requires a connecting member such as a screw in the prior art, and the coating the thermal grease is required. The lamp in the present embodiment adopts the PCB board in the embodiment, and the substrate of the PCB board in Embodiment <NUM> is a glass substrate. Since the glass itself has good thermal conductivity and insulating, the lamp shown in <FIG> directly utilizes the glass substrate of the PCB board as a part of the lamp body of the lamp, so that the operations of locking screw and the coating the thermal grease are not required, which simplifies the manufacturing process and cost of the lamp to a certain extent. The heat dissipation performance of the PCB board of glass base material is excellent, and the glass can be directly used as the lamp body and of the lamp as well as the heat sink, eliminating the base aluminum plate or the glass fiber board, which greatly reduces the material cost and the process cost of the lamp. Moreover, the PCB board using the glass substrate is used as the PCB board of the lamp, so that the light effect can be further improved.

Optionally, the present example further provides another lamp. Based on the above example, a rear insulating case (not shown) may be further included. The rear insulating case is fastened to the bottom surface B of the PCB board <NUM>, and there is a space between the insulating shell and the bottom surface B of the PCB board to form a heat dissipation cavity.

In addition, the lamp in the present example may further include a reflector <NUM> disposed between the transparent cover and the top surface A of the PCB <NUM> and located in the light-emitting cavity a. A reflecting surface <NUM> of the reflector <NUM> inclines outward gradually from the top surface A of the PCB board <NUM> to a direction the transparent cover <NUM> lying in. The reflector <NUM> is disposed in such a manner that the light emitted by the light source can be effectively dispersed according to a predetermined path, thereby greatly improving the light utilization efficiency of the lamp and greatly improving the efficiency of the lamp.

The lamp in the example of the disclosure includes the PCB board in Embodiment <NUM>, and has the structure and function of the PCB board described in Embodiment <NUM>. For details, refer to the description of Embodiment <NUM>, and the details are not described herein.

Specifically, the electrical device in the example of the present disclosure may be a terminal device. <FIG> is a schematic structural diagram of a terminal device according to Embodiment <NUM> of the present disclosure. Specifically, referring to <FIG>, the terminal device <NUM> in the present embodiment may be a computer or a mobile phone.

The terminal device <NUM> may include a housing <NUM>, and one or more of the following components: a processor <NUM>, a memory <NUM>, a power supply circuit <NUM>, a multimedia component <NUM>, an audio component <NUM>, an input/output (I/O) interface <NUM>, and a sensor component <NUM>, and a communication component <NUM>. The power supply circuit <NUM> is used to supply power to various circuits or devices of the terminal device <NUM>; the memory <NUM> is used to store executable program code; and the processor <NUM> runs and executable the program corresponding to the program code by reading executable program code stored in the memory <NUM>; and the terminal device <NUM> further includes a PCB board <NUM> provided by any of the above embodiments, the PCB board <NUM> is disposed inside the space enclosed by the housing <NUM>, and the processor <NUM> and the memory <NUM> are disposed on the PCB board <NUM>.

The terminal device provided by the example of the present disclosure includes the PCB board in Embodiment <NUM>, and has the structure and function of the PCB board described in Embodiment <NUM>. For details, refer to the description of the first embodiment, and the details are not described herein.

Of course, the electrical device in the present example may also be other devices, which will not be illustrated one by one in the present example. All examples including the electrical device of the PCB board in Embodiment <NUM> are in the scope of protection of the present disclosure.

A circuit board manufacturing process may also cause board warpage to exceed the standard. In the process of manufacturing the circuit board, the electroplating process is carried out in the solution, and the soldering and white solidification are baked at a high temperature. The conversion from one process to another requires water washing and drying. These frequent high and low temperatures may cause board warpage if the board is not placed flat during the manufacturing process of the board.

Moreover, from the environmental point of view, the circuit board production process in the prior art involves etching, solder resist ink, tin-spraying process, etc. The above processes all contain a large number of chemical raw materials and heavy metals. For example, etching must undergo strong acid, such as sulfuric acid, hydrochloric acid and the like for etching. The solder resist ink is also a chemical component of a specific formulation. Some processes also require the use of ammonia water, etc. In short, the manufacturing process of the conventional PCB board is a highly polluting manufacturing process, which is not environmentally friendly.

In order to solve the above problems in the conventional PCB board manufacturing process, the present disclosure also provides a manufacturing method of a PCB board. Specifically, <FIG> is a flowchart of a manufacturing method of a PCB board according to example <NUM> of the present disclosure. As shown in <FIG>, the manufacturing method of the PCB board provided by the present example, the PCB board is a PCB board of Embodiment <NUM>, and the manufacturing method includes the following steps:.

The process of printing the silver paste wiring layer in the present example is as follows: stretching → photoresist sizing → drying → printing → developing → drying.

The Stretching is the process of firmly bonding a tight mesh to a frame. In the present example, preferably, the selected mesh may have a mesh number of <NUM>-<NUM> mesh, and the applied photoresist may have a thickness of <NUM>-<NUM>.

The photoresist sizing refers to uniformly coating the photoresist on the screen to block all the meshes of the screen to form a photosensitive film.

The purpose of the drying is to preliminarily dry the photoresist on the screen.

The printing refers to drying the surface of the screen after applying a layer of photosensitive film, covering the film with the image (wiring pattern), illuminating the film with strong light, and exposing the image on the film to the photosensitive film on the plate.

The developing refers to curing the position of the mesh where the wiring pattern has not passed. However, the position of the mesh where the wiring pattern has passed is blocked and does not transmit light thereby, so that it cannot be cured and a leak hole is formed to enable the subsequent silver paste pass, and further the silver paste is printed on the glass substrate through the mesh corresponding to the wiring pattern.

The drying is the drying of a wire mesh formed with a wiring pattern.

Then, the silver paste is coated on the screen, and the mesh corresponding to the wiring pattern exposes the silver paste to the glass substrate, and a silver paste wiring layer is formed on the glass substrate.

S103: coating a top ink layer on the conductive wiring layer, and preserving a preset position for pre-installing an electronic component.

It is understood that the coated top ink layer is selected according to actual needs. Specifically, the coated top ink layer is a white reflective ink layer to improve the light effect of the lamp.

S104: curing processing the top ink layer.

Specifically, the top ink layer may be pre-cured by thermal curing at a temperature of <NUM> to <NUM>, more preferably at <NUM> ± <NUM>, and then cured by ultraviolet (UV). The ultraviolet (UV) curing refers to a process taking the ultraviolet light as <NUM>% an energy-induced reactivity liquid material to rapidly convert into a solid. By combining the two curing manner, the curing effect may be further improved, and the top ink layer after curing is not easily peeled off.

Further, the character layer may also be printed on the top ink layer after the top ink layer is cured. Similarly, the character layer needs to be dried and cured after printing the character layer. The curing method used may be the same as that of the top ink layer, and will not be described here.

<FIG> is a flowchart of a manufacturing method of a PCB board according to example <NUM> of the present disclosure. As shown in <FIG>, on the basis of example <NUM>, further, prior to S103, includes:
S201: coating a bottom ink layer on a bottom surface of the glass substrate layer.

The bottom ink layer is arranged on the bottom surface of the glass substrate to shield the electronic component and the conductive wiring layer of the PCB board, thereby improving the appearance of the electrical device. Preliminary drying may be carried out after coating the bottom ink layer, specifically at <NUM> to <NUM>, more preferably at <NUM> ± <NUM>.

After S201, the method may further include:.

In the present embodiment, when a common glass substrate layer is heated in a heating furnace close to a softening temperature (<NUM> to <NUM>) of the glass, the glass removes internal stress by its own deformation. Then the glass is removed from the heating furnace, and the high-pressure cold air is blown to both sides of the glass by a multi-head nozzle to cool the glass is rapidly and uniformly to room temperature, thereby the tempered glass is obtained. Since the bottom ink layer and the silver paste wiring are printed on the glass substrate layer, the bottom ink layer, the silver paste wiring and the glass substrate layer are tempered and fused together during the tempering process of the glass substrate layer. The silver paste wiring and the bottom ink layer are not easily peeled off after the fusion, thereby effectively improving the service life of the PCB board.

It should be noted that since the top surface A of the PCB board is used for mounting the electronic component, the top ink layer is not frequently contacted after being installed in the electrical device, and the bottom ink layer is more easily touched by humans. The ability to resist peeling of the top ink layer is required even lower.

Of course, it can be understood that, in the present embodiment, the cooling manner of the glass substrate layer may be performed by using a rapid air cooling manner, and other cooling manners, such as water cooling, oil cooling, etc., may also be used. Those skilled in the art may select a proper cooling manner according to actual needs. The manufacturing method of the PCB board in Example <NUM> or Example <NUM> does not evolve the chemical solution treatment process in the whole process, only the ink and the silver paste are chemical, but the processing of the ink and the silver paste is only coating and curing treatments, which do not produce waste water and waste gas, and is very environmentally friendly.

The structure and function of the PCB board manufactured by the manufacturing method of the PCB board provided by Example <NUM> and Example <NUM> of the present disclosure are as such not embodiments of the invention, only the combination of those examples together provide an embodiment of the invention.

Claim 1:
A manufacturing method of a PCB board, comprising:
cutting (S101), to obtain a glass substrate layer (<NUM>) of a preset size;
arranging (S102) a conductive wiring layer (<NUM>) on a top surface of the glass substrate layer (<NUM>), wherein the conductive wiring layer (<NUM>) is a silver paste wiring layer printed by silver paste;
coating (S201) a non-transparent ink material layer (<NUM>) on a bottom surface of the glass substrate layer (<NUM>);
heating (S202) the glass substrate layer (<NUM>) such that the glass substrate layer (<NUM>) is uniformly heated to a preset temperature;
cooling (S203) the heated glass substrate layer (<NUM>) by adopting a preset cooling manner, to temper and fuse the non-transparent ink material layer (<NUM>) and the silver paste wiring with the glass substrate layer (<NUM>);
coating (S103) a white reflective ink material layer (<NUM>) on the conductive wiring layer (<NUM>), and preserving a preset position clear of coating for pre-installing an electronic component (<NUM>); and
curing processing (S104) the white reflective ink material layer (<NUM>).