Camera module and method for manufacturing camera module

Certain embodiments provide a camera module including a lens holder that holds a lens, a transparent substrate disposed below the lens in the lens holder, a driving-device, a substrate including a sensor unit, a driver IC, a plurality of external electrodes electrically connected to the sensor unit and the driver IC, and a wiring for the driving-device. The driving-device is a device which moves the lens in the vertical direction and which is disposed above the transparent substrate in the lens holder. The substrate is disposed below the transparent substrate in the lens holder. The driver IC is an IC which drives the driving-device and which is disposed at a rear side of the substrate. The wiring for the driving-device electrically connects the driving-device with the driver IC.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No.2011-112290 filed in Japan on May 19, 2011; the entire contents of which are incorporated herein by reference.

FIELD

Embodiments described herein relate generally to a camera module and a method for manufacturing the camera module.

BACKGROUND

Generally, the size of a camera module having an auto-focus (hereinafter referred to as AF: Auto Focus) function increases because a driving-device for moving a lens in a vertical direction is mounted in the camera module. A camera module described below is known as a conventional camera module which has an AF function and the size of which can be reduced.

The conventional camera module includes a sensor substrate in which a sensor is disposed on a rear surface of a glass substrate, a lens holder holding a lens and a driving-device that drives the lens inside the lens holder, and an external electrode formed on a rear surface of the sensor substrate to electrically connect the sensor substrate with wiring substrate. In the camera module, the lens holder is mounted on the wiring substrate while the driving-device is disposed on the glass substrate.

A driver IC for supplying a drive voltage to the driving-device is mounted on the wiring substrate outside the lens holder. The driver IC and the driving-device are electrically connected with each other via wiring on the wiring substrate, the external electrode, and a penetrating electrode that penetrates the glass substrate.

However, it is difficult to form the penetrating electrode in the glass substrate on which the sensor is formed.

When manufacturing the conventional camera module having an AF function, a position of the lens holder needs to be adjusted so that light entered through the lens forms an image on the sensor while the lens is shifted to either an upper position or the lower position. However, the lens holder is mounted on the wiring substrate, so that the position of the lens cannot be adjusted by moving the lens holder in a vertical direction. Therefore, it is necessary to separately provide a position adjustment mechanism that can move the position of the lens, that is, the position of the lens holder, to the lens holder.

DETAILED DESCRIPTION

Certain embodiments provide a camera module including a lens holder, a transparent substrate, a driving-device, a substrate, a driver IC for the driving-device, a plurality of external electrodes, and a wiring for the driving-device. The lens holder has a cylindrical shape and includes a lens inside thereof. The transparent substrate is disposed below the lens in the lens holder. The driving-device is a device that moves the lens in the vertical direction and is disposed above the transparent substrate in the lens holder. The substrate is a substrate having a sensor unit on a front surface thereof and wiring connected to the sensor unit via a penetrating electrode on a rear surface thereof, and is disposed below the transparent substrate in the lens holder. The driver IC for the driving-device is an IC that drives the driving-device and is disposed at a rear side of the substrate. The plurality of external electrodes are formed on the rear surface of the substrate and are electrically connected to the wiring and the driver IC for the driving-device, respectively. The wiring for the driving-device is electrically connects the driving-device with the driver IC for the driving-device.

Certain embodiments provide a camera module manufacturing method including forming an adhesive, disposing a lens holder, adjusting a position of the lens holder, curing the adhesive, and electrically connecting a driving-device with a driver IC for a driving-device. The adhesive is formed on a front surface of a transparent substrate of a solid-state image pickup device including a substrate which includes a sensor unit on a front surface thereof and the driver IC for the driving-device disposed at a rear side thereof and the transparent substrate disposed above the substrate. The lens holder has a cylindrical shape and includes a lens and the driving-device that moves the lens in a vertical direction. Further, a fixing plate and a wiring for the driving-device that electrically connects the driving-device and the driver IC for the driving-device with each other are formed on an inner surface of the lens holder. The lens holder is disposed so that the fixing plate is in contact with the adhesive. A position of the lens holder is adjusted by pressing the fixing plate into the adhesive so that a focal point of the lens corresponds to the sensor unit of the solid-state image pickup device. The adhesive is cured after the position of the lens holder is adjusted. The driving-device and the driver IC for the driving-device are electrically connected with each other via the wiring for the driving-device.

Hereinafter, a camera module and a method for manufacturing the camera module according to an embodiment will be described. The camera modules described below are small-sized camera modules with a chip size (CSCM: Chip Scale Camera Module) having an auto-focus function.

FIG. 1is a vertical cross-sectional view showing a camera module according to a first embodiment. As shown inFIG. 1, a camera module10includes a cylindrical lens holder11and a solid-state image pickup device15disposed in the lens holder11. The solid-state image pickup device15includes a silicon substrate13having a sensor unit12and a transparent substrate14and is disposed in the lens holder11so that a circumferential surface of the solid-state image pickup device15is in contact with an inner surface of the lens holder11.

A top plate16in which an opening portion is formed is formed at an opening end (upper end portion) of the cylindrical lens holder11. A fixing plate17for fixing the lens holder11to the solid-state image pickup device15is provided on the inner surface of the lens holder11.

The cylindrical lens holder11has a plurality of lenses (a first lens18-1and a second lens18-2) and a driving-device19inside thereof.

The driving-device19moves the first lens18-1and the second lens18-2in a vertical direction. The driving-device19is disposed above the transparent substrate14and between the fixing plate17and the top plate16in the lens holder11. The driving-device19includes a lens barrel20, an upper leaf spring21-1, a lower leaf spring21-2, a yoke (magnet)22, and a coil23.

The lens barrel20has a cylindrical shape and holds the first lens18-1and the second lens18-2inside thereof. These lenses18-1and18-2are pressed into the lens barrel20, so that the lenses18-1and18-2are held by the lens barrel20. The lens barrel20has a support plate24for supporting the coil23on an outer surface thereof.

The upper leaf spring21-1and the lower leaf spring21-2are elastic plate bodies and are fixed to the inner surface of the lens holder11as well as to both opening end portions of the lens barrel20, respectively. In other words, the lens barrel20is fixed inside the lens holder11by the upper leaf spring21-1and the lower leaf spring21-2.

The yoke22has a ring shape along the inner surface of the lens holder11and is fixed to the inner surface of the lens holder11between the upper leaf spring21-1and the lower leaf spring21-2. A cross-sectional shape of the yoke22is a squared U-shape having a lower open end. The yoke22generates a magnetic field inside thereof.

The coil23has a ring shape corresponding to the shape of the yoke22and is fixed to the support plate24of the lens barrel20. The coil23is inserted inside the squared U-shaped yoke22.

A current flowing through the coil23is a current flowing in the magnetic field generated inside the yoke22. Therefore, when a current is flown through the coil23, a Lorentz force proportional to an amount of the current flowing through the coil23is generated in the coil23along an optical axis direction (in a vertical direction inFIG. 1). The coil23is fixed to the lens barrel20, so that the lens barrel20tries to move along the optical axis direction (the vertical direction inFIG. 1) by the Lorentz force. On the other hand, the lens barrel20receives reaction forces from the upper leaf spring21-1and the lower leaf spring21-2. Therefore, the lens barrel20stays at a position at which the Lorentz force balances the reaction forces received from the upper leaf spring21-1and the lower leaf spring21-2in the lens holder11.

In other words, the driving-device19moves the lens barrel20, that is, the first and the second lenses18-1and18-2, to a predetermined position according to the amount of the current flowing through the coil23. Thereby, the AF function is realized.

The lens holder11described above is fixed to the transparent substrate14(solid-state image pickup device15) by an adhesive25between a front surface of the transparent substrate14(front surface of the solid-state image pickup device15) and the fixing plate17. The fixing plate17is disposed on the transparent substrate14. More specifically, the fixing plate17is disposed at a position at which a distance k between a lower end surface of the lens holder11and the fixing plate17is slightly longer than a thickness s of the solid-state image pickup device15(except for external electrodes described later).

As described later, the adhesive25between the solid-state image pickup device15and the fixing plate17is a position adjustment adhesive25that functions as a position adjustment mechanism for adjusting the position of the lens holder11with respect to the solid-state image pickup device15. In other words, a thickness of the adhesive25is adjusted, so that the lens holder11is fixed to a predetermined position with respect to the solid-state image pickup device15.

In the solid-state image pickup device15disposed in the lens holder11, the transparent substrate14is a support substrate for thinning the silicon substrate13and, for example, is formed of a glass substrate. A circumferential surface of the transparent substrate14is in contact with the inner surface of the lens holder11.

The silicon substrate13is a substrate supported by the transparent substrate14to be thinned and has a sensor unit12on a front surface thereof. The sensor unit12is formed of, for example, a built-in photodiode layer, and generates charges according to received light.

The silicon substrate13is fixed to a rear surface of the transparent substrate14via an adhesive26. The adhesive26is a space forming adhesive26that functions as a spacer forming a desired space between the silicon substrate13and the transparent substrate14.

A first insulting film27is formed on a front surface of the silicon substrate13. The first insulting film27includes first wiring28-1and a first pad electrode28-2inside thereof. A first penetrating electrode29is formed in the silicon substrate13, and the first pad electrode28-2is in contact with the first penetrating electrode29.

A plurality of microlenses30are formed on a front surface of the first insulating film27in an area above the sensor unit12. These microlenses30collect light incident on the camera module10to the sensor unit12.

The space forming adhesive26is formed into a ring shape on the surface of the first insulating film27so that the space forming adhesive26encloses the plurality of microlenses30.

On a rear surface of the silicon substrate13, second wiring31is formed and an electronic component chip32and a driver IC33are disposed.

The second wiring31is in contact with the first penetrating electrode29. The electronic component chip32and the driver IC33are respectively fixed to the rear surface of the silicon substrate13by a die attach film34.

The electronic component chip32is, for example, a semiconductor chip such as an image processing IC and a logic IC or a passive component such as a capacitor chip. On an upper surface of the electronic component chip32(on a lower surface of the chip inFIG. 1) , a pad electrode32afor the chip is provided.

The driver IC33is an IC for driving the driving-device19disposed on the transparent substrate14. Specifically, the driver IC33is an IC for flowing a current through the coil23included in the driving-device19. The driver IC33includes a pad electrode33afor the IC on an upper surface thereof (on a lower surface of the IC inFIG. 1). Although the driver IC33and the coil23are electrically connected with each other, a wiring structure for the electrical connection will be described later.

An insulating film layer35, which is a second insulating film35, is attached to the rear surface of the silicon substrate13including the second wiring31, the electronic component chip32, and the driver IC33. A front surface of the insulating film layer35(a lower surface of the film inFIG. 1) is substantially flat. The insulating film layer35is formed by heat treatment so that the insulating film layer35fills unevenness on the rear surface of the silicon substrate13, which is formed by the second wiring31, the electronic component chip32, and the driver IC33. A front surface of the insulating film layer35can be formed to be substantially flat by appropriately setting conditions of heat treatment to form the insulating film layer35.

Third wiring36is formed on the front surface of the insulting film layer35. Second penetrating electrodes37, which are in contact with the second wiring31, the pad electrode32afor the chip, and the pad electrode33afor the IC, are formed in the insulating film layer35by a method such as patterning. The third wiring36is in contact with the second penetrating electrodes37.

External electrodes38are formed on the third wiring36. The external electrodes38electrically connect the camera module10to wiring on a mounting substrate (not shown inFIG. 1) when the camera module10is mounted on the mounting substrate (not shown inFIG. 1). For example, the external electrodes38are formed of solder balls.

The front surface of the insulating film layer35including the third wiring36is covered with solder resist (not shown inFIG. 1) except for areas of the external electrodes38.

Next, the wiring structure for electrically connecting the driver IC33with the coil23of the driving-device19will be described with reference toFIG. 2.FIG. 2is a plan view of a cross section of a camera module10cut along a dotted line X-X′ inFIG. 1as viewed from the above.

As shown inFIG. 2, a first groove portion39having a concave shape is formed on the inner surface of the lens holder11. The first groove portion39is formed to penetrate from a position where the lower leaf spring21-2is disposed to the lower end surface of the lens holder11. Driving-device wiring40is formed in the first groove portion39(FIG. 1).

For example, as shown inFIG. 1, connection wiring43is formed from a front surface of the lower leaf spring21-2to be connected to the coil23via an outer surface of the lens barrel20including the support plate24. One end of the driving-device wiring40is connected to the coil23via the connection wiring43.

As shown inFIG. 1, the other end of the driving-device wiring40is exposed from the lower end surface of the lens holder11. The other end of the driving-device wiring40is connected to a driving-device electrode41provided on the lower end surface of the lens holder11. The driving-device electrode41is connected to the third wiring36provided on a rear surface of the solid-state image pickup device15by a connection conductor42. For example, the connection conductor42is formed of silver paste.

In this way, the driving-device wiring40electrically connects the coil23of the driving-device19disposed above the transparent substrate14with the driver IC33disposed below the transparent substrate14.

The first groove portion39in which the driving-device wiring40is formed can be easily manufactured by forming a convex portion in a predetermined position of a metal mold for forming the lens holder11. The wiring40in the first groove portion39is integrally formed with the lens holder11by pouring a material such as a resin into the metal mold in a state in which a wiring metal is formed on the convex portion of the metal mold when the lens holder is formed using the metal mold. The connection wiring43on the front surface of the lower leaf spring21-2and the outer surface of the lens barrel20including the support plate24can be also formed in the same manner.

Next, as a method for manufacturing the camera module10described above, a method for fixing the lens holder11to the solid-state image pickup device15will be described with reference toFIGS. 3 to 6.FIGS. 3 to 6are diagrams for explaining the method for manufacturing the camera module10and are cross-sectional views corresponding toFIG. 1.FIGS. 3 to 6omit a part of the solid-state image pickup device15or apart of a test solid-state image pickup device15′.

First, as shown inFIG. 3, a focus position of the lens holder11is measured by using the test solid-state image pickup device15′. Although the test solid-state image pickup device15′ may be a solid-state image pickup device having the same structure as that of the solid-state image pickup device15described above, the test solid-state image pickup device15′ only has to have an image pickup function and have the same thickness as that of the solid-state image pickup device15excluding the external electrodes38, so that the test solid-state image pickup device15′ is not necessarily required to have the electronic component chip32and the driver IC33. In the description below, “the solid-state image pickup device15” means the solid-state image pickup device15shown inFIG. 1.

When measuring the focus position, a test image to be captured (not shown in the drawings) is actually captured by using the test solid-state image pickup device15′ and the lens holder11, and a position of the lens holder11when the test image is in focus is measured. A position t of the lens holder11is a distance from a reference surface, which is a front surface of a first insulating film27of the test solid-state image pickup device15′, to the lower end surface of the lens holder11.

On the other hand, as shown inFIG. 4, a distance t0from the front surface of the first insulating film27of the solid-state image pickup device15to the front surface of the transparent substrate14is measured.

Next, as shown inFIG. 5, the adhesive25is formed into a ring shape on the front surface of the solid-state image pickup device15(on the front surface of the transparent substrate14).

Next, as shown inFIG. 6, the fixing plate17of the lens holder11is pressed into the adhesive25so that a distance from the front surface of the solid-state image pickup device15(the front surface of the transparent substrate14) to the lower end surface of the lens holder11is t+t0. The adhesive25is cured after the lens holder11is disposed at the desired position. Thereby, the lens holder11is fixed onto the front surface of the solid-state image pickup device15(the front surface of the transparent substrate14) via the adhesive25.

Finally, the driving-device electrode41of the lens holder11and the third wiring36on the rear surface of the solid-state image pickup device15are electrically connected to each other by the connection conductor42such as, for example, silver paste. Thereby, the driver IC33and the coil23of the driving-device19are electrically connected to each other and the camera module10shown inFIG. 1is manufactured.

According to the camera module10of the present embodiment described above, the driver IC33disposed below the transparent substrate14and the coil23of the driving-device19disposed above the transparent substrate are electrically connected to each other by the driving-device wiring40provided in the first groove portion39of the lens holder11. Therefore, it is possible to connect the coil23and the driver IC33to each other without forming a penetrating electrode in the transparent substrate14, so that it is possible to provide the camera module10which has an AF function and which can be easily manufactured.

According to the camera module10of the present embodiment, when fixing the lens holder11to the solid-state image pickup device15, the lens holder11is fixed to a desired position by providing the position adjustment adhesive25on the front surface of the solid-state image pickup device15and adjusting an amount by which the fixing plate17of the lens holder11is pressed into the position adjustment adhesive25. In this way, according to the camera module10of the present embodiment, it is not necessary to provide a position adjustment mechanism that can adjust the mounting positions of the first and the second lenses18-1and18-2in the lens holder11, so that it is possible to provide the inexpensive camera module10which has an AF function and which can be easily manufactured.

According to the camera module10of the present embodiment, the driving-device19is disposed above the solid-state image pickup device15and the driver IC33for driving the driving-device19is disposed on the rear surface of the silicon substrate13included in the solid-state image pickup device15. Therefore, it is possible to provide the small-sized camera module10having an AF function.

FIG. 7is a vertical cross-sectional view showing a camera module50according to a second embodiment. In the camera module50shown inFIG. 7, a connection position between the driving-device electrode41and the solid-state image pickup device15is different from that in the camera module10of the first embodiment.

Specifically, in the camera module50of the second embodiment, the driving-device electrode41is electrically connected to the second wiring31of the solid-state image pickup device15by the connection conductor42such as, for example, silver paste.

In this case, the fixing plate52of the lens holder51may be formed at a position at which a distance k′ between the lower end surface of the lens holder51and the fixing plate52is appropriately shorter than a thickness s′ of the solid-state image pickup device15excluding the external electrodes38.

A manufacturing method of the camera module50is the same as that of the camera module10of the first embodiment, so that the description thereof will not be repeated here.

Also in the camera module50of the second embodiment described above, it is possible to connect the coil23and the driver IC33to each other without forming a penetrating electrode in the transparent substrate14, so that it is possible to provide the camera module50which has an AF function and which can be easily manufactured.

Also in the camera module50of the second embodiment, it is not necessary to form a position adjustment mechanism that can adjust the mounting positions of the first and the second lenses18-1and18-2in the lens holder51, so that it is possible to provide the camera module50which has an AF function and which can be easily manufactured. Further, it is not necessary to form a position adjustment mechanism, so that it is possible to provide the inexpensive camera module50having an AF function.

Also in the camera module50of the second embodiment, the driving-device19is disposed above the solid-state image pickup device15and the driver IC33for driving the driving-device19is disposed on the rear surface of the silicon substrate13included in the solid-state image pickup device15. Therefore, it is possible to provide the small-sized camera module50having an AF function.

FIG. 8is a vertical cross-sectional view showing a camera module60according to a third embodiment. In the camera module60shown inFIG. 8, a structure of a rear surface of a silicon substrate13included in a solid-state image pickup device61is different from that in the camera module50of the second embodiment.

As shown inFIG. 8, in the camera module60of the third embodiment, the second wiring31is formed on the rear surface of the silicon substrate13. The second wiring31is in contact with the first penetrating electrode29that penetrates the silicon substrate13.

The electronic component chip32, the driver IC33, and the external electrodes38are respectively formed on the second wiring31.

The electronic component chip32has a pad electrode32afor the chip on an upper surface thereof. A bump62for the chip is formed on the pad electrode32afor the chip. The bump62is in contact with the second wiring31. An anisotropic conductive paste63is formed between the electronic component chip32and the second wiring31. The electronic component chip32is electrically connected to the second wiring31via the bump62and metal particles in the anisotropic conductive paste63.

Similarly, the driver IC33also has a pad electrode33afor the IC on an upper surface thereof. A bump64for the IC is formed on the pad electrode33afor the IC. The bump64is in contact with the second wiring31. An anisotropic conductive paste63is formed between the driver IC33and the second wiring31. The driver IC33is electrically connected to the second wiring31via the bump64and metal particles in the anisotropic conductive paste63.

The rear surface of the silicon substrate13including the electronic component chip32, the driver IC33, and the second wiring31is covered with solder resist (not shown inFIG. 8) except for areas of the external electrodes38.

In this case, the fixing plate52of the lens holder51is disposed at a position at which a distance k″ between the lower end surface of the lens holder51and the fixing plate52is slightly longer than a thickness s′ of the solid-state image pickup device15excluding the external electrodes38.

A manufacturing method of the camera module60is the same as that of the camera module10of the first embodiment, so that the description thereof will not be repeated here.

Also in the camera module60of the third embodiment described above, it is possible to connect the coil23and the driver IC33to each other without forming a penetrating electrode in the transparent substrate14, so that it is possible to provide the camera module60which has an AF function and which can be easily manufactured.

Also in the camera module60of the third embodiment, it is not necessary to form a position adjustment mechanism that can adjust the mounting positions of the first and the second lenses18-1and18-2in the lens holder51, so that it is possible to provide the camera module60which has an AF function and which can be easily manufactured. Further, it is not necessary to form a position adjustment mechanism, so that it is possible to provide the inexpensive camera module60having an AF function.

Also in the camera module60of the third embodiment, the driving-device19is disposed above the solid-state image pickup device61and the driver IC33for driving the driving-device19is disposed on the rear surface of the silicon substrate13included in the solid-state image pickup device61. Therefore, it is possible to provide the small-sized camera module60having an AF function.

FIG. 9is a vertical cross-sectional view showing a camera module70according to a fourth embodiment.FIG. 10is a plan view of a cross section of a camera module70cut along a dotted line Y-Y′ inFIG. 9as viewed from the above.

The camera module70shown inFIGS. 9 and 10is different from the camera module10of the first embodiment in a point in which the camera module70has a shutter unit71in the lens holder11. Further, in the camera module70shown inFIGS. 9 and 10, a structure of a rear surface of a silicon substrate13included in a solid-state image pickup device72is different from that in the camera module10of the first embodiment.

As shown inFIG. 9, in the camera module70of the fourth embodiment, the lens holder11has the shutter unit71inside thereof. The shutter unit71is disposed above the transparent substrate14and between the top plate16and the upper leaf spring21-1and is fixed to the inner surface of the lens holder11.

The shutter unit71has a shutter blade73. The shutter blade73is driven to open and close by a driver IC74described later in an area below the opening portion provided in the top plate16. When the shutter blade73is closed, the shutter blade73blocks incident light to the opening portion of the top plate16. When the shutter blade73is opened, the incident light to the opening portion of the top plate16is not blocked by the shutter blade73and received inside the camera module70.

On the rear surface of the silicon substrate13, the second wiring31is formed and a semiconductor memory75for recording images is disposed. The semiconductor memory75is, for example, a NAND-type flash memory used as a recording medium in a normal digital camera.

The second wiring31is in contact with first penetrating electrodes29that penetrate the silicon substrate13. The semiconductor memory75is fixed to the rear surface of the silicon substrate13by a die attach film76.

The semiconductor memory75has a pad electrode75afor the memory on an upper surface thereof (on a lower surface of the chip inFIG. 9).

An insulating film layer35, which is a second insulating film35, is attached to the rear surface of the silicon substrate13including the second wiring31and the semiconductor memory75.

On a front surface of the second insulating film35, third wiring36is formed and an image processing semiconductor chip77mounted in a normal digital camera is disposed. In the second insulating film35, second penetrating electrodes37, which are in contact with the second wiring31and the pad electrode75afor the memory, are formed by a method such as patterning.

The third wiring36is in contact with the second penetrating electrodes37. The image processing semiconductor chip77is fixed to the front surface of the second insulating film35by a die attach film76.

The image processing semiconductor chip77has a pad electrode77afor the chip on an upper surface thereof (on a lower surface of the chip inFIG. 9).

An insulating film layer, which is a third insulating film78, is attached to the front surface of the second insulating film35including the third wiring36and the image processing semiconductor chip77.

On a front surface of the third insulating film78, fourth wiring79is formed and a wireless device semiconductor chip80for wirelessly operating the shutter unit71from outside and a small battery81having a charging function are disposed.

A small capacity battery which is a sheet-type battery and can be charged from outside is suited to the small battery81having a charging function.

When a small sheet-type battery81having a charging function is applied, regarding a mounting position of the small battery81having a charging function, the small battery81is not necessarily has to be laminated on the rear surface of the silicon substrate13, but may be attached to, for example, an outer circumferential surface of the lens holder11. In this case, wiring which is connected to the small battery81having a charging function and which is extended to the lower end surface of the lens holder11is provided on the outer circumferential surface of the lens holder11, and the wiring at the lower end surface of the lens holder11is connected to sixth wiring87described later by silver paste, so that the small battery81is electrically connected to the external electrodes38.

In the third insulating film78, third penetrating electrodes82, which are in contact with the third wiring36and the pad electrode77afor the chip, are formed by a method such as patterning.

The fourth wiring79is in contact with the third penetrating electrodes82. The wireless device semiconductor chip80and the small battery81having a charging function are respectively fixed to a front surface of the third insulating film78by a die attach film76.

The wireless device semiconductor chip80has a pad electrode80afor the chip on an upper surface thereof (on a lower surface of the chip inFIG. 9). The small battery81having a charging function has a pad electrode81afor the battery on an upper surface thereof (on a lower surface of the chip inFIG. 9).

An insulating film layer, which is a fourth insulating film83, is attached to the front surface of the third insulating film78including the fourth wiring79, the wireless device semiconductor chip80, and the small battery81having a charging function.

On a front surface of the fourth insulating film83, fifth wiring84is formed and a driving-device driver IC33and a shutter unit driver IC74for driving the shutter unit71are disposed. Fourth penetrating electrodes85, which are in contact with the fourth wiring79, the pad electrode80afor the chip, and the pad electrode81afor the battery, are formed on the fourth insulating film83by a method such as patterning.

The fifth wiring84is in contact with the fourth penetrating electrodes85. The driver ICs33and74are respectively fixed to the front surface of the fourth insulating film83by a die attach film76.

The driver IC33has a pad electrode33aon an upper surface thereof (on a lower surface of the chip inFIG. 9). The driver IC74has a pad electrode74aon an upper surface thereof (on a lower surface of the chip inFIG. 9).

An insulating film layer, which is a fifth insulating film86, is attached to the front surface of the fourth insulating film83including the fifth wiring84and the driver ICs33and74.

Sixth wiring87is formed on a front surface of the fifth insulting film86. In the fifth insulating film86, fifth penetrating electrodes88, which are in contact with the fifth wiring84and the pad electrodes33aand74a, are formed by a method such as patterning. The sixth wiring87is in contact with the fifth penetrating electrodes88.

The external electrodes38are formed on the sixth wiring87. For example, the external electrodes38are formed of solder balls.

The front surface of the fifth insulating film86including the sixth wiring87is covered with solder resist (not shown inFIG. 9) except for areas of the external electrodes.

When the solid-state image pickup device72described above is applied, the fixing plate17of the lens holder11is formed at a position at which a distance k′″ between the lower end surface of the lens holder11and the fixing plate17is slightly longer than a thickness s″ of the solid-state image pickup device72excluding the external electrodes38.

Next, a wiring structure for electrically connecting the coil23of the driving-device19with the driving-device driver IC33and a wiring structure for electrically connecting the shutter unit71with the shutter unit driver IC74will be described with reference toFIG. 10.

As shown inFIG. 10, a first groove portion39having a concave shape and a second groove portion89having a concave shape are formed on the inner surface of the lens holder11. The first groove portion39is formed in the same manner as the first groove portion39shown inFIG. 2. On the other hand, the second groove portion89is formed to penetrate from a position where the shutter unit71is disposed to the lower end surface of the lens holder11(FIG. 9).

The driving-device wiring40is formed in the first groove portion39in the same manner as in the camera module10shown inFIGS. 1 and 2. Shutter unit wiring90is formed in the second groove portion89.

One end of the driving-device wiring40is connected to the coil23in the same manner as in the camera module10shown inFIGS. 1 and 2. The other end of the driving-device wiring40is connected to a driving-device electrode41provided on the lower end surface of the lens holder11. The driving-device electrode41is connected to the sixth wiring87provided on a rear surface of the solid-state image pickup device72by a connection conductor42.

On end of the shutter unit wiring90is connected to the shutter unit71. The other end of the shutter unit wiring90is connected to a shutter unit electrode91provided on the lower end surface of the lens holder11. The shutter unit electrode91is connected to the sixth wiring87provided on the rear surface of the solid-state image pickup device72by a connection conductor42.

In this way, the driving-device wiring40electrically connects the coil23of the driving-device19disposed above the transparent substrate14with the driver IC33disposed below the transparent substrate14. The shutter unit wiring90electrically connects the shutter unit71disposed above the transparent substrate14with the driver IC74disposed below the transparent substrate14.

A manufacturing method of the camera module70is the same as that of the camera module10of the first embodiment, so that the description thereof will not be repeated here.

Also in the camera module70of the fourth embodiment described above, it is possible to connect the coil23and the driver IC33to each other without forming a penetrating electrode in the transparent substrate14, so that it is possible to provide the camera module70which has an AF function and which can be easily manufactured.

Also in the camera module70of the fourth embodiment, it is not necessary to form a position adjustment mechanism that can adjust the mounting positions of the first and the second lenses18-1and18-2in the lens holder11, so that it is possible to provide the camera module70which has an AF function and which can be easily manufactured. Further, it is not necessary to form a position adjustment mechanism, so that it is possible to provide the inexpensive camera module70having an AF function.

Also in the camera module70of the fourth embodiment, the driving-device19is disposed above the solid-state image pickup device72and the driver IC33for driving the driving-device19is disposed on the rear surface of the silicon substrate13included in the solid-state image pickup device72. Therefore, it is possible to provide the small-sized camera module70having an AF function.

Further, the camera module70of the fourth embodiment includes the image processing semiconductor chip77, the wireless device semiconductor80, the small battery81having a charging function, and a shutter mechanism including the shutter unit71and the shutter unit driver IC74. In this way, in the camera module70, most of constituent elements of a digital camera are mounted. Therefore, the camera module70can be used as a digital camera when supplying power from outside to drive the camera module70and inputting a shutter signal. Further, the camera module70can be driven as a stand-alone digital camera when the small battery81having a charging function with a small capacity is mounted and a shutter signal is wirelessly transmitted and received. Therefore, it is possible to provide a chip-size digital camera.

The chip-size digital camera is a hands-free digital camera, which can be attached to a pair of glasses, a hat, and the like, and which does not need a liquid crystal viewfinder. Specifically, it is possible to record an image which is the same as an image seen by eyes, so that it is not necessary to look through a finder, and a moving image or a still image which is the same as an image seen by naked eyes can be recorded.

For example, the camera modules10,50,60, and70of the above embodiments are camera modules having an AF function. However, the present invention may be applied to a camera module which does not have an AF function and which has only a shutter function. Alternatively, the present invention may be applied to a camera module which has an auto-iris function (a function for adjusting an amount of incident light according to variation of the brightness of an image to be captured (hereinafter referred to as an AES function)). The AES function is implemented by providing a shutter for adjusting an amount of incident light in the lens holder, disposing various chips for appropriately operating the shutter on the rear surface of the silicon substrate, and connecting the various chips and the shutter by wiring through a groove portion formed in an inner wall surface of the lens holder.