KR102517935B1 - Pcb exposure apparatus capable of double-sided exposure by closely keeping intervening pcb in close contact with transparent panel optically maintaining horizontal alignment - Google Patents

Abstract

The exposure apparatus of the present invention includes a pair of transparent panels on which substrate panels are seated; a camera for sensing a point in time when the substrate panel enters, settles, and is discharged into a pair of transparent panels, and detects a reference point; an exposure unit that scans the substrate panel and is respectively disposed on upper and lower sides of the pair of transparent panels; four elastic members disposed between the pair of transparent panels and made of a shape memory alloy; A gap between the pair of transparent panels includes a heater for heating the elastic member and a cooler for cooling, and the heater and the cooler are controlled at the point in time when the substrate panel sensed through the camera enters, settles, or is discharged. and a control unit controlling the exposure machine so that the position of the reference point of the detected substrate panel matches the position of the previously set substrate panel.

Description

PCB exposure device capable of double-sided exposure by keeping the transparent panel optically aligned horizontally and adhering the intervening PCBs

The present invention relates to a PCB exposure apparatus capable of double-sided exposure by maintaining a transparent panel optically aligned horizontally and closely adhering an intervening PCB, and a PCB manufactured by the same.

In general, a printed circuit board plays a role in easily connecting various electronic device elements according to a certain frame, and is a part widely used in all electronic products, from home appliances including digital TVs to high-tech communication devices, and is universal depending on the purpose. It is classified into PCB, module PCB, and package PCB.

That is, the printed circuit board is made by attaching a thin plate such as copper to one side of a phenolic resin insulating board or an epoxy resin insulating board, and then etching it according to the wiring pattern of the circuit (leaving only the circuit on the line and removing it by corrosion) to configure the necessary circuit and component It is formed by drilling holes for attaching and mounting components, and is classified into single-sided board, double-sided board, multi-layer board, etc. according to the number of wiring circuit planes.

In recent years, with the development of the electronic industry, ultra-thin printed circuit boards (thickness of 0.04 mm to 0.2 mm) have been widely used.

A double-sided board in which circuits are formed on both sides and connected to each other through a through hole, or a multi-layer board in which a plurality of layers are expanded as well as both sides are increasingly used.

Currently, a photolithography process for forming a pattern by phototransfer is widely used in manufacturing a printed circuit board. In particular, a semi-additive method capable of coping with the high-density wiring density is widely used.

The manufacturing method of the printed circuit board using the semi-additive method includes a seed layer formation process, a pretreatment process, a dry film lamination process, an exposure process, a development process, an electrolytic copper plating process, a dry film peeling process, and a flash etching process. Etching) process.

Among them, since the exposure process uses the artwork film to form a circuit pattern, the artwork film is easily damaged and difficult to correct.

Accordingly, a laser direct imaging exposure machine that directly exposes a layer to be exposed on a substrate using a laser diode as a light source without using a photo mask has been developed and used. Accordingly, a wiring pattern is formed on the panel.

Such an LDI exposure machine has advantages in that it is easy to modify a wiring pattern and the process is simplified. In the case of the LDI exposure machine, there was a problem in increasing production volume in that only one panel could be exposed for each process and only one side of the panel could be exposed. In this case, there was a problem that matching between the front and back patterns was difficult.

On the other hand, in order to solve the above-described problem, the PCB is seated between a pair of transparent panels (optically transmissive), and then the pair of transparent panels are brought into close contact to fix the PCB, and the exposure devices disposed on the upper and lower sides are moved to perform scanning. Although an ongoing exposure apparatus has been developed, the conventional exposure apparatus has a problem in that the quality of an exposure process cannot be secured because technical means for precisely controlling a pair of transparent panels while maintaining an optical level are not provided.

The problem to be solved by the present invention is to provide a PCB exposure apparatus capable of double-sided exposure by maintaining a transparent panel optically aligned horizontally and closely contacting an interposed PCB, and a PCB manufactured thereby.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

An exposure apparatus of the present invention for solving the above problems includes a pair of transparent panels on which substrate panels are seated; a camera for sensing a point in time when the substrate panel enters, settles, and is discharged into a pair of transparent panels, and detects a reference point; an exposure unit that scans the substrate panel and is respectively disposed on upper and lower sides of the pair of transparent panels; four elastic members disposed between the pair of transparent panels and made of a shape memory alloy; A gap between the pair of transparent panels includes a heater for heating the elastic member and a cooler for cooling, and the heater and the cooler are controlled at the point in time when the substrate panel sensed through the camera enters, settles, or is discharged. It may be characterized in that it includes a control unit for controlling the exposure machine so that the position of the reference point of the detected substrate panel and the position of the previously set substrate panel are matched.

The pair of transparent panels may be characterized in that they are closely coupled at the top and bottom surfaces of the substrate panel.

The pair of transparent panels may be characterized in that an edge area other than an area where the substrate panel is disposed is made of translucent or opaque material.

The printed circuit board of the present invention for solving the above problems may be characterized in that it is manufactured by the exposure device.

The PCB exposure apparatus capable of double-sided exposure of the present invention and the PCB manufactured by the same can expose both sides of the panel to improve the productivity of the panel. In particular, the PCB is a shape memory alloy and the gap is precisely controlled. Since it enters between the transparent panels and adheres to them, the exposure process proceeds in a fixed state according to the optical conditions set by the optical horizontal alignment of the pair of transparent panels, thereby improving the quality of the exposure process.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is an exploded perspective view showing a state in which a pair of transparent panels are adsorbed and installed on both sides of a substrate panel in a conventional exposure machine.
2 is an exemplary view showing a state in which a conventional exposure machine is installed.
3 is an exemplary view showing the operation of the exposure apparatus of the present invention.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only these embodiments are intended to complete the disclosure of the present invention, and are common in the art to which the present invention belongs. It is provided to fully inform the person skilled in the art of the scope of the invention, and the invention is only defined by the scope of the claims.

Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements other than the recited elements. Like reference numerals throughout the specification refer to like elements, and “and/or” includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first element mentioned below may also be the second element within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used with meanings commonly understood by those skilled in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined.

[Conventional exposure apparatus: FIGS. 1 and 2]

A conventional exposure apparatus 100 includes a pair of transparent panels 10 coupled at both sides of a substrate panel 20, an exposure machine 30 for scanning the substrate panel 20, and a base point detection for the substrate panel 20. A control unit for controlling the position of a camera (not shown), an exposure device 30, and a pair of transparent panels 10 is included.

The pair of transparent panels 10 may use glass having excellent transmittance as a material, and are closely coupled to each other on the upper and lower surfaces of the substrate panel 20 . During close bonding, a strong adsorption state is maintained so that the substrate panel 20 does not flow due to vacuum adsorption.

When the pair of transparent panels 10 are closely coupled to the substrate panel 20 in this way, the substrate panel 20 can maintain a flat state.

At this time, in the pair of transparent panels 10, the upper transparent panel 12 and the lower transparent panel 14 can be in close contact at the same time on the upper and lower surfaces of the substrate panel 20, and the lower transparent panel 14 In a fixed state, only the upper transparent panel 12 may be in close contact with the lower transparent panel 14 while pressing the substrate panel 20 .

In addition, the remaining portions of the pair of transparent panels 10 , except for the region where the substrate panel 20 is disposed, may be composed of opaque or translucent regions.

This is to visually check the state in which the substrate panel 20 is disposed when the pair of transparent panels 10 are coupled on the upper and lower surfaces of the substrate panel 20 .

Such a pair of transparent panels 10 are moved to a position where the exposure machine 30 for scanning the substrate panel 20 is installed.

The exposure machine 30 has a laser diode inside, and although not shown in the figure, a plurality of exposure heads are arranged inside.

In addition, although not shown in the figure, an optical head is installed inside or outside the exposure machine 30, so that the reference point, initial position, and real-time position of the substrate panel to be transferred can be measured.

The location of the exposure device 30 can be detected not only by the optical head but also by the CCD camera.

That is, the horizontal type CCD camera and the optical head may be installed on the upper/lower side, and the vertical type may be installed on the left/right side based on the traveling direction of the substrate panel.

Although not shown in the figure, the CCD camera captures an image of the reference point of the panel by emitting light from the strobe and reflecting light from the strobe.

Data captured by the CCD camera and the optical head are transmitted to the control unit through wireless or wired communication.

The controller is usually a computer with embedded control software. The control unit controls the matching of the exposure machine and the pair of transparent panels.

The control unit incorporates an image data processing unit and a mirror driving control unit for controlling driving of the exposure machine 30 . The controller generates a driving signal for each exposure machine and a control signal for controlling the angle and driving of the micromirror.

In addition, the control unit compares the data transmitted from the CCD camera with the position data of the panel reference point at the time of matching stored in advance, calculates a position correction value of the pair of transparent panels 10 and the exposure machine 30, and calculates the pair of transparent panels A control signal is transmitted to (10) and the position correcting means included in the exposure machine (30).

The panel exposure apparatus of the printed circuit board according to the embodiment of the present invention configured as described above operates as follows.

When both sides of the substrate panel 20 are scanned, both sides of the substrate panel 20 are disposed between a pair of transparent panels 10 . When the substrate panel 20 is disposed, strong adsorption is made between the pair of transparent panels 10 so that the substrate panel 20 does not flow during the transfer process.

The transferred pair of transparent panels 10 detects a reference point of the substrate panel 20 through an optical head and a CCD camera, and transmits data to the control unit.

The controller compares the received data with the stored reference panel matching position data and corrects the position of any one of the pair of transparent panels 10 and the exposure device 30 . The substrate panel 20 is matched with the exposure machine 30 by this corrected position.

After the matching is completed, the substrate panel 20 is moved to the exposure area, and when the substrate panel 20 enters the exposure area, the exposure machine 30 irradiates the substrate panel 20 with laser light according to a control signal from the control unit. Exposure is performed.

At this time, when the patterns applied to the upper and lower surfaces of the substrate panel 20 are different from each other, each exposure machine 30 performs exposure in a different pattern according to a signal from the control unit.

When the entire exposure process is completed on the substrate panel 20, the pair of transparent panels 10 and the substrate panel 20 are transferred to their original positions.

[Exposure apparatus of the present invention: Fig. 3]

Compared with the conventional exposure apparatus 100, the exposure apparatus 1000 of the present invention has the following differences. In the exposure apparatus 1000 of the present invention, each of a pair of transparent panels 1010 in the shape of a substantially square plate has a central region (transparent region; an area in which an exposure process is performed by overlapping substrate panels) and an edge region (opaque or translucent region). ; an area in which the exposure process does not proceed because the substrate panel does not overlap), and four elastic members 1030 are disposed in a one-to-one correspondence at the four corners of the edge area of the pair of transparent panels 1010. and the other end may connect four corners of the edge regions of the pair of transparent panels 1010 . In addition, the four elastic members 1030 are bidirectional shape memory alloy springs that shrink when cooled and may be set to return to their original shapes (relative expansion) when heated.

In addition, the exposure apparatus 1000 of the present invention receives electronic signals from the controller and cools the four elastic members 1030 so that they contract, and the four elastic members 1030 maintain their original shapes or A heater (not shown) for heating to return to its original shape may be further included.

In addition, the central region of the upper transparent panel 1012 of the pair of transparent panels 1010 is formed with a step below the edge region of the upper transparent panel 1012 to be thicker, and the pair of transparent panels 1010 The lower transparent panel 1014 may be formed thicker than the edge region of the lower transparent panel 1014 with a step difference therebetween.

Accordingly, in the exposure apparatus 1000 of the present invention, 1) when the substrate panel 2020 starts to enter between the pair of transparent panels 1010 (entry point), the control unit recognizes the camera (or a separate entry sensor) The heater may be operated by receiving entry information, and as a result, the four elastic members 1030 are heated to maintain or return to their original shapes, and thus between the central regions of the pair of transparent panels 1010. A gap is formed in the substrate panel 2020 can be seated, 2) the substrate panel 2020 is seated between the central areas of the pair of transparent panels 1010 (at the seating point), and then the camera (or separate The cooler can be operated by receiving the seating information recognized by the seating detection sensor), and as a result, the four elastic members 1030 are cooled so that they are contracted at equal intervals, and the central area of the pair of transparent panels 1010 is cooled. In this optically horizontally aligned state, the substrate panel 2020 can be adhered and fixed, and 3) the exposure process (scanning by the exposure machine 1040 is completed) is completed, and the substrate panel 2020 is a pair of transparent panels ( 1010), the control unit can operate the heater by receiving the emission information recognized from the camera (or a separate emission detection sensor) at the time of emission (discharge time), and as a result, the four elastic members 1030 return to their original shape. It is heated to maintain or return to its original shape, so that a gap is created between the central regions of the pair of transparent panels 1010, and the substrate panel 2020 can be discharged.

According to the foregoing, in the exposure apparatus 1000 of the present invention, the pair of transparent panels 1010 are precisely operated by the four elastic members 1030 made of a shape memory alloy, thereby forcefully pressing the substrate panel 2020. At the same time, there is an advantage in that a precise exposure process can be performed by being in close contact with each other in an optically horizontally aligned state.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims (4)

A pair of transparent panels on which the substrate panel is seated;
A camera that senses the point at which the substrate panel enters, settles, and is discharged into the pair of transparent panels and detects a reference point;
Exposure machines respectively disposed above and below the pair of transparent panels for scanning the substrate panel;
four elastic members disposed between the pair of transparent panels and made of a shape memory alloy;
a heater for heating the elastic member and a cooler for cooling; and
The gap between the pair of transparent panels is adjusted by controlling the heater and the cooler at the time of entry, seating, and discharge of the substrate panel sensed by the camera, and the location of the reference point of the detected substrate panel and the substrate set in advance. A control unit controlling the exposure machine so that the positions of the panels are matched;
The pair of transparent panels are in the form of a square plate, and are tightly coupled at the upper and lower surfaces around the substrate panel, and the edge area except for the central area where the substrate panel is disposed and the exposure process proceeds and the area where the substrate panel is disposed are It is composed of translucent or opaque, and the four elastic members are disposed in a one-to-one correspondence at the four corners of the edge area,
The central region of the upper transparent panel of the pair of transparent panels is thicker than the edge region of the upper transparent panel of the pair of transparent panels to have a step below, and the central region of the lower transparent panel of the pair of transparent panels is formed thickly so as to have a step above the edge region of the upper transparent panel of the pair of transparent panels,
The four elastic members are bidirectional shape memory alloy springs that contract when cooled and return to their original shape when heated,
When the substrate panel starts to enter between the pair of transparent panels, the controller receives entry information recognized from the camera and operates the heater, so that the four elastic members have their original shapes and A gap is created between the central regions, and the substrate panel is seated,
When the substrate panel is seated between the central regions of the pair of transparent panels, the control unit receives seating information recognized from the camera and operates the cooler so that the four elastic members are contracted at equal intervals, The central region of the pair of transparent panels adheres to and fixes the substrate panel,
When the exposure of the substrate panel is completed by the exposure machine and the substrate panel is discharged from between the pair of transparent panels, the control unit receives the discharge information recognized from the camera and operates the heater, so that the four elastic members are originally An exposure apparatus characterized in that a gap is formed between the central regions of the pair of transparent panels and the substrate panel is discharged.
delete delete delete

Images