KR20210084148A - Image Sensor Package using Printed Circuit Board and Manufacturing Process thereof - Google Patents

Abstract

The present invention comprises an image sensor package which comprises: an image sensor chip that receives a light signal; a metal substrate disposed in a lower portion of the image sensor chip; and a printed circuit board disposed in an upper portion of the metal substrate and including a through-region. The metal substrate and the printed circuit board are combined and the image sensor chip is located within the through-region. Therefore, the present invention maximizes a heat dissipation effect.

Description

Image Sensor Package using Printed Circuit Board and Manufacturing Process thereof

The present invention relates to an image sensor package, and more particularly, to an image sensor package using a printed circuit board and a method of manufacturing the same.

In general, a silicon semiconductor device including an image sensor is manufactured using a silicon wafer process. In such a silicon wafer process, individual devices commonly called “die” are made on each wafer manufactured through a predetermined semiconductor process for each device, usually arranged in an M x N matrix, and then in the wafer state. Each of the dies that have passed a predetermined electrical characteristic test is generally separated and then housed in a dedicated structure called a package to be completed as a single semiconductor device.

A structure called a package seals and houses a silicon semiconductor die in the internal space to protect it from external impact or contamination, and supplies power and input signals to the semiconductor chip inside the package through metal lead wires or metal pins. , it serves to transfer the output signal obtained from the semiconductor chip to an external device. For this purpose, ceramic or thermosetting plastic is mainly used as a semiconductor device package material. In the case of an image sensor, since it is a semiconductor device that converts a light signal into an electrical signal, the top surface of the package is different from general semiconductor devices. It is characterized in that it has a transparent material such as glass as a cover.

Although a printed circuit board has been used as a package structure for accommodating a semiconductor device, there has been a need for a storage structure that improves heat dissipation when the semiconductor device generates a lot of heat.

On the other hand, in electric and electronic devices employing a silicon semiconductor image sensor, including a machine vision camera device, when the image sensor is continuously used for a long period of time, structural deformation due to heat generated in the silicon semiconductor chip appears. have.

In the case of a camera device employing an image sensor, an image is usually secured by fixing an image sensor light-receiving area (pixel) at a lens focal length position. The image sensor mainly used in machine vision camera devices is a line scan type image sensor whose length is several times larger than its width. There is a problem in that the focus of the image obtained from the camera device is out of focus.

One aspect of the present invention is a housing structure that improves heat dissipation when the image sensor semiconductor element generates a lot of heat while using a printed circuit board in a package structure for accommodating the image sensor semiconductor element by improving the problems of the prior art as described above. and to propose a manufacturing method capable of preventing thermal deformation.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An image sensor package according to an embodiment of the present invention for achieving this object is characterized in that the image sensor chip for receiving a light signal and converting it into an electrical signal; a metal substrate disposed under the image sensor chip; and a printed circuit board disposed on the metal substrate and including a through region, wherein the metal substrate and the printed circuit board are coupled, and the image sensor chip is located in the through region. A sensor package is provided.

A method of manufacturing an image sensor package according to an embodiment of the present invention comprises: combining a metal substrate with a metal substrate so as to cover the through area under the printed circuit board including the through area; an image sensor chip bonding step of bonding the image sensor chip to an upper portion of the metal substrate so that the image sensor chip is positioned within the through region; a connection step of connecting a metal pad disposed at a predetermined position of the image sensor chip and a metal pad disposed on the printed circuit board using a metal wire; and disposing an optical cover on the image sensor chip.

The chip-on-metal substrate (COM) package structure according to the embodiment of the present invention employs a metal substrate with good thermal conductivity as the package lower structure and is physically connected to a metal material (eg, aluminum) used for the exterior of the camera device. The design allows for easy heat dissipation outside the camera unit. In the COM package structure according to the present invention, since the thermoelectric element (eg, Peltier element) can be directly connected to the metal substrate under the package, the heat dissipation effect can be maximized. Accordingly, the image sensor package of the present invention can be used for accommodating an image sensor that is continuously driven for a long time, such as a machine vision camera device. In addition, the printed circuit board serving as the package body in the package structure of the present invention can be manufactured in the same size as the circuit board essential for driving the image sensor in a general camera device, so that it can be connected with a connector to form a stacked structure. Therefore, it is possible to facilitate the use of space inside the camera device.

1 is a view showing a schematic configuration of an image sensor package using a printed circuit board according to an embodiment of the present invention.
2 is a front view and a side cross-sectional view of an industrial machine vision camera device equipped with an image sensor package using a printed circuit board according to an embodiment of the present invention.
3 is a diagram schematically illustrating a silicon semiconductor image sensor chip according to an embodiment of the present invention.
4A and 4B are views showing a schematic configuration of a metal substrate according to an embodiment of the present invention.
5A, 5B, and 5C are views showing a schematic configuration of a printed circuit board according to an embodiment of the present invention.
6 is a view showing a schematic configuration of an optical glass according to an embodiment of the present invention.
7 is a view showing a schematic configuration of a support according to an embodiment of the present invention.
8A and 8B are views showing a schematic configuration of a metal substrate according to an embodiment of the present invention.
9A, 9B, and 9C are views showing a schematic configuration of a printed circuit board according to an embodiment of the present invention.
10 is a view showing a schematic configuration of an optical glass according to an embodiment of the present invention.
11 is a view showing a schematic configuration of a support according to an embodiment of the present invention.
12 is a diagram illustrating a method of bonding a printed circuit board according to an embodiment of the present invention.
13 is a diagram illustrating a method of bonding a metal substrate according to an embodiment of the present invention.
14A and 14B are diagrams for explaining a configuration in which a printed circuit board and a metal substrate are combined according to an embodiment of the present invention.
15 is a view illustrating a configuration in which an image sensor chip and a metal substrate are combined according to an embodiment of the present invention.
16 is a view for explaining a configuration in which an image sensor chip and a printed circuit board are electrically connected according to an embodiment of the present invention.
17 is a view for explaining a configuration in which a support layer and a printed circuit board are combined according to an embodiment of the present invention.
18 is a view for explaining a configuration in which the optical glass is combined according to an embodiment of the present invention.
19A to 19E are views for explaining a method of manufacturing a chip-on-metal substrate structure image sensor package using a printed circuit board according to an embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to refer to the same or similar components.

And throughout the specification, when a part is “connected” or “coupled” with another part, it is not only “directly connected” or “directly coupled” but also “connected” with other components in between. " or "combined". In addition, when a part "includes" or "includes" a certain component, it means that other components may be further included or provided without excluding other components unless otherwise stated. . In addition, even if some components are described in the singular in the description of the entire specification, the present invention is not limited thereto, and it is clear that the components may be made in a plurality.

1 is an image sensor package structure used in a machine vision camera apparatus according to an embodiment of the present invention, and FIG. 2 is an image sensor package using a printed circuit board according to an embodiment of the present invention is mounted. It schematically shows the front and cross-section of an industrial machine vision camera device.

As a structure for accommodating a semiconductor device, in a semiconductor device that generates little heat or has a small size, a chip-on-board (chip-on) that directly attaches a semiconductor chip to a printed circuit board (PCB) made by stacking several layers of thermosetting plastic plates. -board, COB) structure. Such a COB package structure has many advantages because it is light, easy to manufacture, and inexpensive, and it is easy to electrically and mechanically connect to a circuit board using other electrical and electronic components used in the system.

On the other hand, when the semiconductor device is driven, heat is generated due to power consumption, and when the temperature of the semiconductor device itself rises due to the generated heat, the electrical characteristics of the device deteriorate due to an increase in the noise signal, so the heat generated during device operation A structure that can be easily released to the outside of the package is required. In particular, in the case of an image sensor employed in a machine vision camera device used in an automated production process in a factory, heat dissipation is an important factor in the package structure because it must operate continuously without interruption.

In order to facilitate heat dissipation, it is preferable to use a metal material with good thermal conductivity, but metal wiring (mainly copper or gold plating with excellent electrical conductivity) must be formed inside the package for input/output signals and power supply. , it is impossible to fabricate the entire package from a metal material.

Therefore, the present invention combines the advantages of the COB structure and the advantages of a metal material with good heat dissipation properties, and uses a chip-on-metal (chip-on-metal,) area under the package in direct contact with the semiconductor chip as a metal material. COM) package structure is proposed.

First, referring to the left side of FIG. 2 , which is a front view of a machine vision camera device according to an embodiment of the present invention, the upper case 10 of the camera device is molded from a metal material (eg, aluminum) and the size of the camera device is minimized. Efforts to make it possible to have a square structure circumscribed to the diameter of the camera lens barrel. In the center of the front of the camera device, a circular region 20 connecting the barrel (not shown) of the camera lens is provided, and in the middle part, the image sensor size is adjusted so that the light through the lens can be received by the internal image sensor light receiving unit. It may be provided with an exposed area 40 drilled to match. In addition, according to an embodiment of the present invention, the corner of the square external structure of the upper case 10 may be provided with a through hole (30) for fixing the parts to be accommodated in the device with bolts and nuts. . However, the coupling between the upper case 10 and the lower structure, such as the first printed circuit board 100, which is the image sensor package body, can be any other method as long as it is a suitable coupling method in the art, and for convenience of description, It is not limited to Jin bolts, nuts, and through holes.

Referring to the right side of FIG. 2, which is a cross-sectional side view of a machine vision camera device, the first printed circuit board 100, which is an image sensor package body according to an embodiment of the present invention, is a first printed circuit board equipped with electronic components for driving an image sensor. 2 The printed circuit board 300 and the third printed circuit board 400 in charge of the input/output signals 410 and 420 of the image sensor have a stacked structure that enables communication through the connectors 150 and 350 in turn, and is provided on the exterior of the camera They may be physically connected through one through-hole 30 .

1 and 2 , the image sensor package structure according to an embodiment of the present invention includes a first printed circuit board 100 , a metal substrate 200 , and a second printed circuit board 300 , which are the package main body. , may include a connector 150 for mechanical connection.

In the metal substrate 200 of the present invention, the image sensor chip 80, which is a silicon semiconductor chip, is bonded thereon by, for example, bonding, and the circuit and the image sensor chip 80 designed on the first printed circuit board 100. of the circuit may be connected with a metal wire 90 . The metal substrate 200 of the present invention may be made of a metal material having good thermal conductivity (eg, SUS metal) for heat dissipation of the image sensor chip 80 .

In addition, the image sensor package structure according to an embodiment of the present invention includes an optical cover 60 (eg, optical glass) for protecting the image sensor chip 80 while being able to receive light through the lens of the camera device thereon. In order to secure the height when the metal wire 90 electrically connecting the circuit designed on the first printed circuit board 100 and the image sensor chip 80, which is a silicon semiconductor, is disposed, the support 70 is provided. can be placed

In addition, a through hole 30 having a predetermined size may be provided at a corner of the first printed circuit board 100 , which is the package body, to be fixed to the camera device. And, by providing a hole 250 having a predetermined size so as to correspond to the position of the cut-out region of the first printed circuit board 100 at the edge of the metal substrate 200, which is the lower structure of the package. When bonding with the first printed circuit board 100, which is the main body, in the package manufacturing process (eg, when bonding and fixing using an epoxy resin), it can be used for bonding at an accurate position.

3 is a plan view schematically illustrating an image sensor chip 80 according to an embodiment of the present invention. The image sensor chip 80 may be designed such that a light receiving area (pixel) 82 that receives a light signal and converts it into an electrical signal at the center of the chip occupies most of the chip area, and the chip operation is performed around the light receiving area 82 . The peripheral circuit regions 83a and 83b necessary for this are arranged, and on the outer periphery thereof, a metal pad 81 used for bonding one end of a metal wire to make an electrical connection with the outside of the image sensor chip 80 is arranged. can do. The other end of the metal wire may be connected to a metal pad provided on the first printed circuit board 100 .

4 to 7 are views schematically illustrating each component constituting an image sensor package having a chip-on-metal substrate (COM) structure using a printed circuit board according to an embodiment of the present invention.

4A and 4B are diagrams illustrating a metal substrate 200 in a chip-on-metal (COM) image sensor package structure. In the COM structure package, the metal substrate 200 is a semiconductor silicon chip. It may be a medium that is physically bonded to the back side to support it. According to an embodiment of the present invention, the metal substrate 200 may use a metal material having good thermal conductivity so as to maximize the heat dissipation effect in the case of an industrial machine vision camera that generates a lot of heat.

FIG. 4A is a view showing an upper surface to which a silicon semiconductor chip is adhered, and FIG. 4B is a view showing an opposite lower surface of the metal substrate 200 .

As shown in FIG. 4A , an identification mark for aligning a chip position in a package manufacturing process may be included on the upper surface to be adhered to the silicon semiconductor chip. According to an embodiment of the present invention, the identification tag may be displayed at a position matching one or more of the corners of the image sensor chip 80 .

In addition, a hole 250 for use in a package process may be formed in the corner of the metal substrate 200 according to the present invention, and it will serve to fix the metal substrate according to a jig having a specific shape in the package manufacturing process. Thus, two or more holes 250 may be formed in a diagonal direction or formed in all four corners. In addition, the metal substrate 200 may be manufactured through a flatness management regulation, and may include a separate identification tag for distinguishing an upper surface and a lower surface.

5A to 5C are diagrams schematically illustrating a first printed circuit board 100 that is a package body according to an embodiment of the present invention. 5A is an upper surface of the first printed circuit board 100, FIG. 5B is a lower surface, and FIG. 5C is a pad 110 provided on the first printed circuit board 100. It is an enlarged view of area “A”.

5A and 5B, the first printed circuit board 100 for accommodating the image sensor is a plastic substrate printed with circuit wiring (not shown) in several layers (eg, 6 to 8 layers, or more). It is manufactured by stacking, and the external shape of the printed circuit board can be manufactured according to the shape of the system in which the image sensor is mounted (eg, in a square or rectangular shape).

According to an embodiment of the present invention, a through hole 30 having a predetermined size may be provided at a corner of the first printed circuit board 100 for the purpose of fixing it to a machine vision camera device, and the first printed circuit board 100 is provided on the back side of the first printed circuit board 100 . The connector 150 to which the circuit lines of the printed circuit board 100 are connected may be provided to electrically connect with other printed circuit boards used in the machine vision camera device, and may have a mechanically stable structure.

In addition, according to an embodiment of the present invention, the image sensor chip 80, which generates a lot of heat during operation, adopts a structure in which the image sensor chip 80 is coupled to a separate metal substrate 200 without being adhered to the printed circuit board body, thereby using a machine vision device. The possibility of thermal deformation occurring in the printed circuit board during the process can be fundamentally prevented. For this purpose, the first printed circuit board 100 and the lower metal substrate 200 may be coupled and fixed to each other (eg, by adhesion) so that the contact area is as small as possible.

According to an embodiment of the present invention, the image sensor chip 80 is located in the center of the first printed circuit board 100 so that the image sensor coupled to the metal substrate 200 can receive the light signal due to the characteristics of the image sensor element. It can be designed to have a hollow penetration area with a larger area than the size of . In addition, necessary circuit lines are arranged in portions other than the penetration region of the first printed circuit board 100, and in some cases, capacitors and resistors for matching circuit impedances on the upper and lower surfaces of the printed circuit board. The same passive element can be arranged.

Referring to FIG. 5C , it is possible to form the metal pad 110 on the uppermost layer of the first printed circuit board 100 to enable connection to the metal pad 81 on the image sensor chip 80 through a metal wire.

6 is a view showing an optical cover 60 according to an embodiment of the present invention. The optical cover 60 is attached to an upper portion of a printed circuit board package to provide a desired wavelength in a light receiving area (pixel) of the image sensor chip 80 . A structure that serves to protect the image sensor chip 80 from external contamination sources while allowing the light signal of the region to pass through, and may be, for example, optical glass. In general, the optical glass 60 manages the transmittance characteristics, and an anti-reflection coating treatment may be added to the surface to suppress reflection from the glass surface.

FIG. 7 is a view showing the support 70 inserted between the optical glass and the printed circuit board when the optical glass 60 is attached to the upper portion of the first printed circuit board 100 . As described with reference to FIG. 5C , a metal pad 110 for electrically connecting to the metal pad 81 disposed on the image sensor chip 80 may be formed on the first printed circuit board 100 . For electrical connection, a metal wire may be bonded to both metal pads 81 and 110 using a wire bonder device, and at this time, the metal wire may form a convex shape upward. Therefore, when the optical glass 60 is directly attached to the upper part of the first printed circuit board 100, it is in contact with the metal wire and a defect occurs. Therefore, it is necessary to increase the height for a process margin in the package manufacturing process. The support 70 of FIG. 7 may be disposed for this purpose, and if possible, a material having a thermal expansion coefficient similar to that of the printed circuit board material may be used. That is, according to an embodiment of the present invention, the support 70 is made of an epoxy resin or a phenol resin having a similar thermal expansion coefficient to that of the printed circuit board material, so that the optical glass 60 and adjacent printed circuits may occur when the thermal expansion coefficient is different. Unwanted deformation such as warpage of the substrate can be prevented.

8 to 11 are diagrams schematically illustrating each component constituting a chip-on-metal substrate (COM) structure image sensor package using a printed circuit board according to an embodiment of the present invention.

8A and 8B are views corresponding to FIGS. 4A and 4B, respectively, and FIGS. 9A, 9B, and 9C are views corresponding to FIGS. 5A, 5B and 5C, respectively, and FIGS. 10 and 11 are FIGS. 6 and 7, respectively. respond to According to the embodiment of FIGS. 8 to 11 , the angular corners of each part may be rounded, and in terms of configuration or function, the embodiment may be the same or similar to the embodiment of FIGS. 4 to 7 . Since this external shape configuration basically depends on the camera device external design, the image sensor package having a chip-on-metal substrate structure using a printed circuit board according to the present invention is implemented in various forms as well as those shown in the illustrated embodiment. can be

12 to 19 are views schematically illustrating a method of manufacturing an image sensor package using a printed circuit board according to an embodiment of the present invention. Although the manufacturing method of this embodiment is described based on the structure shown in FIGS. 4 to 7 , the manufacturing method or process of the present invention is not limited only to this external structure.

Referring to FIG. 12 , the adhesive 160 is applied to the lower surface of the first printed circuit board 100 at a predetermined location and with a predetermined thickness. According to an embodiment of the present invention, the adhesive 160 may be, for example, a thermosetting epoxy resin.

Referring to FIG. 13 , a state in which an adhesive 160 is applied to a predetermined position and a predetermined thickness on the upper surface of the metal substrate 200 is shown. According to an embodiment of the present invention, the adhesive 160 may be, for example, a thermosetting epoxy resin. However, for convenience of explanation in the present specification, examples of adhesives and epoxy resins are given, but the present invention is not limited thereto and any mechanical, physical, or chemical suitable for bonding the first printed circuit board 100 and the metal substrate 200 . It will be apparent to those skilled in the art that methods may include. In addition, the adhesive 160 used in FIGS. 12 and 13 may be different or the same, respectively.

On the other hand, the hole 250 disposed at the edge of the metal substrate 200 may be fixed by being mounted on a jig installed in line with the manufacturing process line when applying the adhesive.

14A and 14B, as shown in FIGS. 12 and 13, in a state in which the adhesive 160 is applied to the lower surface of the first printed circuit board 100 and the upper surface of the metal substrate 200, respectively, position alignment In this state, the surfaces on which the adhesive 160 is applied face each other and are bonded by applying a predetermined force, indicating a state in which the adhesive 160 is cured for a predetermined time under an appropriate temperature condition using an oven. Position matching of the first printed circuit board 100 and the metal substrate 200 can be performed by matching the positions of the cutout area of the first printed circuit board 100 and the hole 250 in the corner of the metal substrate 200 . .

14A is a view shown in the direction of the upper surface of the first printed circuit board 100, and the upper surface of the metal substrate 200 is exposed in the penetrating region at the center of the first printed circuit board 100, and the metal substrate 200 ) shows a state in which the image sensor chip bonding position mark 210 on the upper surface is visible. 14B is a view shown in the direction of the lower surface of the metal substrate 200, the metal substrate 200 shows a form in which all of the penetrating area in the center of the first printed circuit board 100 is covered, and the first printed circuit board 100 ) shows a state in which the connector 150 disposed on the lower surface protrudes.

Referring to FIG. 15 , the image sensor chip 80 is bonded according to the bonding position guide mark 210 on the upper surface of the metal substrate 200 in the state of FIG. 14 . Although omitted from the drawings, there may be a process of applying an adhesive 160 such as a thermal curing epoxy resin between the image sensor chip 80 and the metal substrate 200 and curing in an oven. However, the present invention is not limited to this example, and any suitable material and equipment used in a semiconductor chip assembly process for bonding a silicon semiconductor image sensor chip to a metal substrate may be used.

An example of the adhesive 160 used in the process of FIGS. 12 to 15 may include a thermal curing epoxy resin, and the physical properties of the epoxy resin are that the first printed circuit board 100 is not deformed during the thermal curing process. It may have a property of being cured at a temperature of less than 80 degrees Celsius.

On the other hand, in the manufacturing method of FIGS. 12 to 15 , the process of bonding the image sensor chip 80 to the metal substrate 200 is performed before the process of bonding the first printed circuit board 100 and the metal substrate 200 . method may also be included.

Referring to FIG. 16 , after the die attaching step of attaching the image sensor chip 80 to the metal substrate as in FIG. 15 is finished, the metal pad 81 provided in the image sensor chip 80 and the first printing process are performed. A wire bonding process for connecting the metal pads 110 provided on the circuit board 100 to each of the metal wires 90 is performed. The wire bonding process according to an embodiment of the present invention may be performed using suitable equipment, metal wire specifications, applied force, and the like, and is not limited to a specific method. According to an embodiment of the present invention, a contamination source may be removed from the upper portion of the image sensor chip 80 , in particular, the light receiving area (pixel) by performing a de-ionized water washing process before the wire bonding process.

Referring to FIG. 17, after wire bonding, an adhesive 160 such as, for example, a thermosetting epoxy resin is applied to one side of the support 70 and a predetermined position on the first printed circuit board 100, respectively, and bonded to each other. , can be adhered for a predetermined time under a predetermined temperature condition. According to one embodiment of the present invention, the height of the support 70 attached to the first printed circuit board 100 is sufficient in advance so as not to contact any part of the metal wire 90 when covering the optical glass 60 . It can be designed to have a height. In addition, the width 71 of the support 70 may be designed in advance so as not to invade the light receiving area pixel 82 of the image sensor chip 80 .

Referring to FIG. 18 , the optical glass 60 may be bonded on the support 70 . The method of bonding the optical glass 60 may be any mechanical, physical, or chemical method. As an example, bonding may be performed using an adhesive such as an epoxy resin. In addition, the epoxy resin used in the process of bonding the optical glass 60 may be an epoxy resin that reacts to ultraviolet rays rather than a thermosetting resin.

Although not shown in FIG. 18 , a predetermined cleaning process may be added before bonding the optical glass 60 . In the image sensor package manufacturing process, after the optical glass 60 is covered to seal the inner space of the package, it is difficult to remove the floating matter present therein. Therefore, a cleaning process may be required to prevent image defects caused by the floating matter.

By bonding the optical glass 60 on the support 70 in this way, an image sensor package using the printed circuit board according to the present invention can be completed.

19A to 19E are re-illustrated cross-sectional views of the image sensor package shown in FIGS. 12 to 18 taken along line X-X′ of FIG. 18 .

Referring to FIG. 19A , it shows a state in which an adhesive 160 such as a thermosetting epoxy resin is applied at predetermined positions to bond the first printed circuit board 100 and the metal substrate 200 to each other. Another embodiment includes a method of applying the adhesive 160 to only one side of the first printed circuit board 100 or the metal substrate 200 .

Referring to FIG. 19B , in the step of FIG. 19A , the first printed circuit board 100 and the metal substrate 200 are bonded using a predetermined adhesive 160 , and then the image sensor chip 80 is attached to the metal substrate 200 . It shows a state where it is bonded using a predetermined adhesive 165 at a predetermined position. According to an embodiment of the present invention, the adhesive 165 may be the same or different coupling means as the adhesive 160 .

Referring to FIG. 19C , a metal wire 90 is used between a pair of a metal pad 81 disposed at a predetermined position of the image sensor chip 80 and a metal pad 110 disposed on the first printed circuit board 100 . This indicates the connected state. As shown, the height of the metal wire 90 completed by the wire bonding process may be higher than the upper surface of the first printed circuit board 100 .

Referring to FIG. 19D , when the metal wire 90 is positioned higher than the first printed circuit board 100 , physical damage may occur to the metal wire 90 when the optical glass 60 is covered, so the height of the space inside the package need to be raised For this purpose, it is possible to add a support body 70 as an auxiliary structure. The support 70 and the first printed circuit board 100 may be adhered to each other using an adhesive 175 such as a thermosetting epoxy resin. According to an embodiment of the present invention, the adhesive 175 may be the same or different bonding means as the adhesives 160 and 165 .

Referring to FIG. 19E , a cross-section of the image sensor package using the printed board according to the present invention by bonding the upper portion of the support 70 and the optical glass 60 is shown. An adhesive 185, such as an ultraviolet curing epoxy resin, is applied at predetermined positions under the support 70 and the optical glass 60, and then, by applying a predetermined force, the optical glass 60 is attached to the first printed circuit board 100 ) can be produced by curing the adhesive 185 under predetermined conditions in an ultraviolet generator while being disposed in the .

In one embodiment of the present invention, the image sensor chip 80 in view of a virtual horizontal axis can be viewed as being located inside the penetration region of the first printed circuit board 100, and the image in view of a virtual vertical axis It can be seen that the sensor chip 80 and the first printed circuit board 100 are positioned on the same plane.

According to an image sensor package and a method for manufacturing the same according to an embodiment of the present invention, it is possible to prevent unwanted thermal deformation. Thermal deformation is a phenomenon that occurs because different materials have different coefficients of thermal expansion. In the case of a chip-on-printed circuit board (COB) or chip-on-metal (COM) image sensor package structure, the actual camera system is used in the field. Due to the heat generated by the image sensor itself or the image sensor driving circuit during the process, it is mainly generated between the printed circuit board and the metal plate made of thermosetting plastic. In the assembly process that houses the image sensor in a package, a thermosetting epoxy resin is used. It is generated in the thermal process of bonding a silicon semiconductor chip and a metal substrate, a metal substrate and a plastic printed circuit board, and a glass cover to the top of the printed circuit board.

The present invention improves the above problems, and the package upper structure is a printed circuit board, the lower structure is a metal with good thermal conductivity and a material that responds to magnets, and thermal deformation in the COM package structure employing optical glass on the upper part of the image sensor It provides a structure that minimizes the cost and a method of stacking and assembling the structure.

The chip-on-metal substrate (COM) package structure according to the embodiment of the present invention employs a metal substrate with good thermal conductivity as the package lower structure and is physically connected to a metal material (eg, aluminum) used for the exterior of the camera device. The design allows for easy heat dissipation outside the camera unit. In the COM package structure according to the present invention, since the thermoelectric element (eg, Peltier element) can be directly connected to the metal substrate under the package, the heat dissipation effect can be maximized. Accordingly, the image sensor package of the present invention can be used for accommodating an image sensor that is continuously driven for a long time, such as a machine vision camera device. In addition, the printed circuit board serving as the package body in the package structure of the present invention can be manufactured in the same size as the circuit board essential for driving the image sensor in a general camera device, so that it can be connected with a connector to form a stacked structure. Therefore, it is possible to facilitate the use of space inside the camera device.

For those of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. is not limited by

30: through hole 60: optical cover
70: support 80: image sensor chip
100: first printed circuit board 200: metal substrate
250: hall 300: second printed circuit board
400: third printed circuit board

Claims (20)

an image sensor chip that receives a light signal and converts it into an electrical signal;
a metal substrate disposed under the image sensor chip; and
A printed circuit board disposed on the metal substrate and including a through region
including,
The image sensor package, characterized in that the metal substrate and the printed circuit board are coupled, and the image sensor chip is located in the through region.
The method of claim 1,
An image sensor package, characterized in that a partial region of the metal substrate and a partial region of the printed circuit board are bonded by an adhesive, and the image sensor chip is bonded on the metal substrate by an adhesive.
The method of claim 1,
An area of the metal substrate is larger than the through area, and an area of the image sensor chip is smaller than the through area.
The method of claim 1,
The image sensor package, characterized in that the image sensor chip coupled to the metal substrate and the printed circuit board are electrically connected using a metal wire.
The method of claim 1,
An optical cover capable of transmitting light is disposed on the image sensor chip, and a space between the image sensor chip and the optical cover is sealed.
The method of claim 1,
The image sensor package, characterized in that at least one connector is disposed in one area of the printed circuit board for electrical connection with another printed circuit board.
The method of claim 1,
The printed circuit board may be selected from a square shape or a rectangular shape, and an image sensor package, characterized in that the corner shape is processed to be a right angle or a round shape.
The method of claim 1,
The through area of the printed circuit board is an area cut out in a rectangular shape along the outer shape of the image sensor chip, and wirings are disposed in areas other than the through area.
9. The method of claim 8,
One end of each of the wires disposed on the printed circuit board is connected to a connector pin, and the other end is connected to be connected to a metal pad disposed around the through area.
6. The method of claim 5,
The metal pad formed on the uppermost layer of the printed circuit board and the image sensor chip are electrically connected through a metal wire,
The optical cover and the printed circuit board are coupled through a support,
The image sensor package, characterized in that the support has a predetermined height so that the metal wire does not come into contact with the optical cover.
The method of claim 1,
The image sensor package, characterized in that the printed circuit board and the metal substrate are bonded by a thermosetting epoxy resin.
12. The method of claim 11,
The thermosetting epoxy resin is an image sensor package, characterized in that it has physical properties that are cured at less than 80 degrees Celsius.
The method of claim 1,
A structure characterized in that it is designed to be fixed to peripheral components by disposing through holes in at least two or more of the corners of the printed circuit board.
The method of claim 1,
The image sensor package, characterized in that the metal substrate has a rectangular shape, the corners are formed at right angles or rounded, and at least two or more through-holes are arranged in the corners to be fixed to the jig during the manufacturing process.
The method of claim 1,
The metal substrate is an image sensor package, characterized in that the SUS series metal material.
The method of claim 1,
An image sensor package, characterized in that when the image sensor chip is coupled to one surface of the metal substrate, a position guide mark for position matching is disposed.
a metal substrate bonding step of bonding the metal substrate to a lower portion of the printed circuit board including the through region so as to cover the through region;
an image sensor chip bonding step of bonding the image sensor chip to an upper portion of the metal substrate so that the image sensor chip is positioned within the through region;
a connection step of connecting a metal pad disposed at a predetermined position of the image sensor chip and a metal pad disposed on the printed circuit board using a metal wire; and
disposing an optical cover on top of the image sensor chip
A method of manufacturing an image sensor package comprising a.
18. The method of claim 17,
and disposing a support having a predetermined height on the printed circuit board so that the metal wire does not contact the optical cover.
19. The method of claim 18,
The method of manufacturing an image sensor package, characterized in that it further comprises the step of applying an ultraviolet curing epoxy resin to a predetermined position on the upper portion of the support and the lower portion of the optical cover, and curing the resin in an ultraviolet generator.
18. The method of claim 17,
In the metal substrate bonding step, an adhesive is used between the printed circuit board and the metal substrate, and in the image sensor chip bonding step, an adhesive is used between the metal substrate and the image sensor chip. A method of manufacturing an image sensor package.

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