Ceramic board, method manufacturing thereof, image sensor package and method of manufacturing the same

Disclosed herein is a ceramic board and the manufacturing method and an image sensor package and a manufacturing method thereof, the ceramic board including a ceramic body in which an upper surface is formed with a first groove, a second groove is formed in the first groove, and the second groove is formed with a through hole; a first electrode pad formed in the first groove; and a second electrode pad formed at any one of the upper surface, a lower surface and the both surfaces of the ceramic body, electrically connected to the first electrode pad.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit under 35 U.S.C. §119 of Korean Patent Application No. 10-2010-0059739, filed Jun. 23, 2010, which is hereby incorporated by reference in its entirety.

BACKGROUND OF THE DISCLOSURE

1. Field of the Invention

The present invention relates to a ceramic board and the manufacturing method and an image sensor package and a manufacturing method thereof.

2. Description of the Related Art

Generally, a ceramic board is used in a package of active devices such as a semiconductor drive chip, or employed as a package containing passive devices and active devices such as a capacitor, an inductor and a resistor.

That is, a ceramic board is widely used to construct various electronic components such as a module substrate, a switch, a filter, a chip antenna, and each kind of chip package substrate.

In recent years, a ceramic substrate is manufactured in a way that a plurality of ceramic sheets is stacked, by performing a firing process.

At this time, a stacked ceramic sheet is interposed with metal material like an inter-layer electrode line or a via electrode, by which, as a result, a structure may be changed by contraction during firing, and a warpage may occur according to the structure of a stacked ceramic sheet to cause a fault.

BRIEF SUMMARY

The present invention provides a ceramic board including a ceramic body in which an upper surface is formed with a first groove, a second groove is formed in the first groove, and the second groove is formed with a through hole; a first electrode pad formed in the first groove; and a second electrode pad formed at any one of the upper surface, a lower surface and the both surfaces of the ceramic body, electrically connected to the first electrode pad.

The first electrode pad and the second electrode pad may be electrically connected by an electrode line and a conductive via hole formed inside the ceramic body.

Also, the ceramic body may be made by firing.

Also, a width of the through hole may be smaller than that of the second groove, and a width of the second groove may be smaller than that of the first groove.

And, another groove between the first groove and the second groove may be further formed.

In addition, the first groove and the second groove may be connected with an inclined plane.

An area joined with a bottom surface of the first groove and a side surface of the second groove may be tapered off.

The present invention provides an image sensor package using a ceramic board including, a ceramic board containing a ceramic body in which an upper surface is formed with a first groove, a second groove is formed in the first groove, and the second groove is formed with a through hole, a first electrode pad formed in the first groove, and a second electrode pad formed at any one of the upper surface, a lower surface and the both surfaces of the ceramic body, electrically connected to the first electrode pad; and an image sensor chip containing an electrode pad electrically connected to the first electrode pad.

A sealant interposed between the chip and the ceramic board may be further included.

The sealant may be a curable epoxy resin.

An electrode pad of the image sensor chip and the first electrode pad may be electrically connected with a single bump or a stacked bump.

The bump may be an Au bump.

The image sensor chip does not protrude from an upper surface of the ceramic body.

An FPC (Flexible Printed Circuit) electrically connected to the second electrode pad may be further included.

The first and second electrode pads may be electrically connected by an electrode line and a conductive via hole formed inside the ceramic body.

The image sensor chip may receive light of a subject via the through hole.

Another groove between the first groove and the second groove may be further formed.

The present invention provides a manufacture method of a ceramic board including, preparing a first ceramic sheets formed with a first through hole, a second ceramic sheets formed with a second through hole having a larger width than that of the first through hole, and a third ceramic sheets formed with a third through hole having a larger width than the second through hole; sequentially stacking the first ceramic sheets, the second ceramic sheets and the third ceramic sheets; and firing the stacked first through third ceramic sheets.

The first to the third through holes may be communicated, in a state that the first to third sheets are stacked.

A surface of the second ceramic sheet exposed to the third through hole may be formed with a first electrode pad, an upper-most layer ceramic sheet of the third ceramic sheets may be formed with a second electrode pad, electrode lines and conductive via holes for electrically connecting the first electrode pad to the second electrode pad may be formed in the first to third ceramic sheets.

The first to third ceramic sheets are an LTCC (Low Temperature Co-firing Ceramic) for low-temperature firing or an HTCC (High Temperature Cofired Ceramic) for high-temperature firing.

The present invention provides a manufacture method of an image sensor package using a ceramic board, including, preparing a ceramic board containing a ceramic body in which an upper surface is formed with a first groove, a second groove is formed in the first groove, and the second groove is formed with a through hole, a first electrode pad formed in the first groove, and a second electrode pad formed at any one of the upper surface, a lower surface and the both surfaces of the ceramic body, electrically connected to the first electrode pad; forming a bump on an electrode pad of an image sensor chip; and mounting the image sensor chip on the ceramic board by a flipchip bonding of a bump formed onto an electrode pad of the image sensor chip to the first electrode pads.

A step of interposing sealant between the image sensor chip and the ceramic board may be further included, subsequent to mounting the image sensor chip on the ceramic board.

The step of interposing sealant between the image sensor chip and the ceramic board may be a process of applying and curing curable epoxy resin between the image sensor chip and the ceramic board.

The step of preparing the ceramic board may include preparing a first ceramic sheets formed with a first through hole, a second ceramic sheets formed with a second through hole having a larger width than that of the first through hole, and a third ceramic sheets formed with a third through hole having a larger width than that of the second through hole; sequentially stacking the first ceramic sheets, the second ceramic sheets and the third ceramic sheets; and firing the stacked first through third ceramic sheets.

A process of electrically connecting an FPC (Flexible Printed. Circuit) to the second electrode pad may be further included.

The present invention advantageously forms a groove in a ceramic body, so that a chip mounted onto the ceramic body does not a through-hole surrounding area of the ceramic body.

In the end, the present invention beforehand removes a partial area of a ceramic body bent by warpage at firing, to keep the chip from contacting a bent ceramic body when mounted on the ceramic hoard, to inhibit a breakage such as the crack or scratch of a chip and to raise a yield.

Further, the present invention dispenses with unnecessary contacting area existing when a chip is mounted onto a ceramic board, to effectively increase flipchip bonding power.

In addition, the present invention interposes sealant between a chip and a ceramic board, to enhance a strength of a chip that is to be glued to the ceramic board.

DETAILED DESCRIPTION

Hereinafter, described is an embodiment of the present invention in reference to the annexed drawings.

FIG. 1is a schematic cross-section of a ceramic board according to the present invention.

In the ceramic board, the construction includes a ceramic body100wherein an upper surface is formed with a first groove110, the first groove110is formed with the second groove120, and the second groove120is formed with a through hole130; a first electrode pad210formed with the first groove110; and a second electrode pad220formed at the upper surface, the lower surface and any one of both parts, electrically connected to the first electrode pad210.

Herein, it is preferable that the first and second electrode pads210,220are electrically connected with an electrode line101and a conductive via hole20formed inside the ceramic body100.

And, it is preferable that the ceramic body100may be made by a firing.

In such constructed ceramic board, the first groove110is mounted with a chip, electrically connected to the first electrode pad210.

Therefore, the first groove110is one accommodating the chip.

Also, the second groove120is for inhibiting a breakage such as crack or scratch of the chip mounted at the first groove110, due to occurring warpage, when the ceramic body100is cofired.

By this, a ceramic board of the present invention, remarkably decreasing a fault by warpage on a structure, advantageously increases a yield.

Also, the present invention, when a chip is mounted on a ceramic board, does not make any unexpectedly contacting area, resultantly augmenting flipchip bonding power.

And, the chip desires an image sensor chip, and in a case the chip is an image sensor chip, by means of the through hole130light of a subject is inputted.

Moreover, preferably, a width L3of the through hole130is smaller than a width L2of the second groove120, and the width L2of the second groove120is designed smaller than a width L1of the first groove110.

FIG. 2is a schematic prospective diagram of a ceramic board according to the present invention.

A ceramic board according to the present invention, as shown inFIG. 2, may be realized in a rectangular-plate shape, in which having toward a center direction of a rectangular-plate shaped ceramic body100, a structure of being a first groove110, a second groove120, and a through hole130sequentially formed.

And, a bottom surface of the first groove100may be arranged with 1stelectrode pads210, capable of electrically connected with a mounted chip.

Also, the ceramic body100upper surface is also formed with 2ndelectrode pads220electrically connected to 1stelectrode pads210, enabling electrically connecting to external devices.

FIGS. 3aand 3care schematic cross-sections for describing a manufacture method of a ceramic board according to the present invention.

A ceramic board according to the invention is stacked with a plurality of ceramic sheets, and realized by firing the stacked ceramic sheet.

That is, in the description of a manufacture method of a ceramic substrate according to the present invention, first, as shown inFIG. 3a, first ceramic sheets151,152,153formed with a first through hole130, and second ceramic sheets154,155formed with a second through hole131being a greater width than the through hole130, and third ceramic sheets156,157,158formed with a third through hole132of greater width than the second through hole131are prepared.

Thereafter, the first ceramic sheets151,152,153, the second ceramic sheets154,155, and the third ceramic sheets156,157,158are sequentially stacked. (FIG. 3b)

Herein, in a stacked state of the first through third ceramic sheets151,152,153,154,155,156,157,158, the first through third through holes130,131,132are communicated therethrough.

And, a surface of the second ceramic sheet155exposed to the third through hole132is formed with a first electrode pad210, an uppermost layer ceramic sheet ‘158’ of the third ceramic sheets156,157,158is formed with a second electrode pad220, and electrode lines101and conductive via holes20for electrically connecting the first electrode pad210and the second electrode pad220are formed at the first through third sheets151,152,153,154,155,156,157,158.

Herein, the first through third ceramic sheets151,152,153,154,155,156,157,158may be applied under an LTCC (Low Temperature Co-firing Ceramic) for low-temperature firing or an HTCC (High Temperature Cofired Ceramic) for high-temperature firing.

By way of conditions, it is preferred that a ceramic board of the present invention is cofired with HTCC.

FIG. 4is a schematic cross-section showing a mounted state of a chip on a to-be-mounted part of a ceramic board according to the invention.

When a ceramic board of the present invention is mounted with a chip, first electrode pads210of the ceramic substrate is electrically connected to an electrode pad310of a chip300.

That is, an electrode pad310of the chip300is formed with a bump350, the bump350formed at the electrode pad310of the chip300is flipchip bonded to the first electrode pads210, and the chip300is mounted on the ceramic board, thereby electrically connecting 1stelectrode pads210of the ceramic board with the electrode pad310of the chip300and simultaneously mounting a chip, so that what is known as a package together with a chip can be fabricated.

Herein, the bump350is preferably an Au bump.

FIG. 5is a conceptual cross-section for describing the occurrence of a warping at a ceramic board according to a comparative example over the invention, andFIG. 6is a conceptual cross-section for describing the occurrence of a warping at a ceramic board according to the invention.

A ceramic body10of a comparative example of the invention is mostly identical with a ceramic body100according to the present invention, but the above-described second groove (the drawing signs are not shown) is not provided.

When the ceramic body10of such a comparative example and a ceramic body100according to the present invention are in firing, a warpage occurs, in which a ceramic body10of the comparative example does not have the second groove and by warpage a chip301is broken, whereas a ceramic body100according to the invention exists with the second groove and thus by warpage the chip301is not broken.

That is, as shown inFIG. 5, a surrounding region of a through hole (the drawing numeral is not shown), in the ceramic body10of a comparative example, contacts the chip301mounted on the ceramic body10, while in a ceramic body100according to the present invention, like FIG.6, a surrounding region of a through hole100does not contact with the chip301due to the second groove.

In the end, a ceramic body100according to the invention in advance removes the chip301contacting area by warpage, thereby inhibiting the breakage of the chip301.

FIG. 7is a schematic planar view for describing the fixation of a chip mounted on a ceramic substrate according to the invention, andFIG. 8is a schematic partial cross-section for describing a state ofFIG. 7.

After a chip300is mounted on a ceramic substrate100, a given interval between the chip300and the ceramic board100exists.

And, since the chip300is bonded with bump to first electrode pads (the drawing numeral is not shown) of the ceramic substrate100, the chip300depends on a bonding power of bump regarding a force fixed to the ceramic board100.

Therefore, since even in a small external force, the bump has high possibility of exfoliating from the chip300and the ceramic board100, the chip300can easily leave away from the ceramic board100.

Therefore, the present invention may interpose sealant370between the chip300and the ceramic board100, thereby enhancing a strength of the chip300gluing to the ceramic substrate100.

And, the sealant370may applied with curable epoxy resin, capable of curing the spread sealant370. At this time, the curable epoxy resin is preferably thermosetting epoxy resins.

FIG. 9is a schematic partial cross-section showing one example of a state that a chip is mounted on a ceramic board according to the invention.

In the above description, it was stressed that a chip300's mounting on a ceramic board100is preferably performed by a flipchip bonding.

At this time, before the chip300is mounted on the ceramic substrate100, a bump is fused on an electrode pad310of the chip300, in which the fused bump may be a single bump or stacked bump.

That is, as shown inFIG. 9, between an electrode pad310of the chip300and a first electrode pad210of the ceramic board100may be interposed with a bump stacked by a first bump351and a second bump352.

Such a stacked bump may inhibit the chip300from contacting the ceramic board100, by warpage of the ceramic substrate100.

FIG. 10is a schematic cross-section showing a state that an FPC (Flexible Printed Circuit) is bonded to a ceramic substrate according to the invention.

After a ceramic body100of a ceramic board is mounted with a chip300, a second electrode pad220formed on the ceramic body100may be electrically connected with an FPC500.

The FPC500is for delivering a power supply to the chip300mounted on the ceramic body100and sending a signal generated in the chip300to an external device, andFIG. 10shows an appearance that an electrode pad510of the FPC500is bonded to the second electrode pad220by bump550.

At this time, the mounted chip300is well advised not to protrude from an upper surface of the ceramic body100.

That is, this is because when the mounted chip300is protruded from an upper surface of the ceramic body100, the FPC500electrically connects with the ceramic body100and thus contacts the chip300, causing damage to the chip300.

FIG. 11is a schematic cross-section for describing a ceramic board of another embodiment of the present invention.

A ceramic board of another embodiment of the invention has a groove for more effectively inhibiting damage to a chip due to warpage of a ceramic body.

That is, a ceramic board of another embodiment of the invention with its construction includes a ceramic body700in which an upper surface is formed with a first grove710, inside the first groove710is formed a second groove720, and the second groove720is formed with a third groove730, and the third groove730is formed with a through hole740; a first electrode pad751formed at the first groove710; a second electrode pad752formed at any one of an upper surface, a lower surface and both parts of the ceramic body700, electrically connected to the first electrode pad751.

And, in an order of the first groove710's width L6, the second groove720's width L7, the third groove730's width L8and a width L9of the through hole740, a width is great. (L6>L7>L8>L9)

Thus, in a ceramic board of an embodiment shown inFIG. 11, compared with a ceramic substrate of an embodiment shown inFIG. 1, a ceramic body700area bent by warpage can be removed by the third groove730, remarkably inhibiting a breakage of a chip.

FIGS. 12aand 12bare schematic partial cross-section for describing other examples of a ceramic board according to the invention.

In a ceramic board of an embodiment shown inFIG. 1, a first groove110and a second groove120may be constructed to connect by an inclined surface121, resultantly decreasing possible contact with a chip.

And, an area encountering with a bottom surface of the first groove110and a side surface of the second groove120may be taper-worked, so that a contact area of a chip can be removed or by reasoning of not sharpening when contacted with the chip a breakage of a chip may be lessen.

That is,FIG. 12bshows a taper process area ‘122’.

While the present invention has been described in detail through representative embodiments in the above part, it would be understood by those skilled in the art that various modifications and variations can be made within a spirit and a scope of the invention, and they pertain to the annexed claims.