Source: https://patents.google.com/patent/EP1631060A1/en
Timestamp: 2020-01-29 06:38:58
Document Index: 764680749

Matched Legal Cases: ['art 7', 'art 17', 'art 7', 'art 7', 'art 7', 'art 7', 'art 7', 'art 17', 'art 17', 'art 7', 'art 17', 'art 7', 'art 17', 'art 7', 'art 7', 'art 17', 'art 7', 'art 17', 'art 4', 'art 4', 'art 19', 'art 19', 'art 19', 'art 19', 'art 19', 'art 19', 'art 19', 'art 4']

EP1631060A1 - Imaging device and its manufacturing method - Google Patents
Imaging device and its manufacturing method Download PDF
EP1631060A1
EP1631060A1 EP04734931A EP04734931A EP1631060A1 EP 1631060 A1 EP1631060 A1 EP 1631060A1 EP 04734931 A EP04734931 A EP 04734931A EP 04734931 A EP04734931 A EP 04734931A EP 1631060 A1 EP1631060 A1 EP 1631060A1
EP04734931A
EP1631060A4 (en
EP1631060B1 (en
2004-05-26 Application filed by Panasonic Corp filed Critical Panasonic Corp
2004-05-26 Priority to PCT/JP2004/007582 priority patent/WO2004107738A1/en
2006-03-01 Publication of EP1631060A1 publication Critical patent/EP1631060A1/en
2007-08-01 Publication of EP1631060A4 publication Critical patent/EP1631060A4/en
2008-11-05 Publication of EP1631060B1 publication Critical patent/EP1631060B1/en
238000003384 imaging method Methods 0 abstract claims description title 139
210000003027 Ear, Inner Anatomy 0 abstract claims description 33
An imaging apparatus includes: a three-dimensional substrate in which a partition wall (11) having an opening (10a) at a central portion is formed so as to cross an inner cavity; an optical filter (5) that is fixed on a first flat surface (12) of both surfaces of the partition wall so as to cover the opening; a semiconductor imaging device (4) that is face-down mounted on a second flat surface (13) of the partition wall with an imaging area (4a) facing the opening; and an optical system for forming images that is installed on a side of the optical filter in the inner cavity of the three-dimensional substrate. The opening of the partition wall is closed on both sides with the optical filter and the semiconductor imaging device so as to form a cavity. An air passage (12a) for allowing communication between the cavity and an exterior of the three-dimensional substrate is formed on the first flat surface, and has a labyrinth structure that causes a flow rate of air passing through the air passage to vary depending on a location in the air passage. This allows air circulation between the exterior and a cavity enclosed by a semiconductor imaging device and an optical filter, while suppressing the entry of foreign matter from the exterior into the cavity via an airflow caused by exp ansion/contraction of air.
Such a conventional imaging apparatus provides a reduced margin of strength due to the thickness reduction of each constituent component. Because of this, in a heating process for bonding or joining, the flatness of a surface of a three dimensional substrate on which a semiconductor imaging device is mounted is likely to be deteriorated due to anisotropy in thermal expansion of the substrate and heat distortion caused in the substrate.
However, with the air purging hole communicating with the cavity, foreign matter may enter the cavity from the exterior via an airflow caused by the expansion/contraction of air. Further, this configuration requires an operation of closing the hole after a bonding or sealing process, and, therefore, foreign matter generated by a material used to close the hole or foreign matter produced in the closing operation may enter into the inside of the module to cause a flaw in an image.
An imaging apparatus according to the present invention includes: a three-dimensional substrate in which a partition wall having an opening at a central portion is formed so as to cross an inner cavity; an optical filter that is fixed on a first flat surface of both surfaces of the partition wall so as to cover the opening; a semiconductor imaging device that is face-down mounted on a second flat surface of the partition wall with an imaging area facing the opening, and an optical system for forming images that is installed on a side of the optical filter in the inner cavity of the three-dimensional substrate. The opening of the partition wall is closed on both sides with the optical filter and the semiconductor imaging device so as to form a cavity In order to solve the above-mentioned problems, an air passage for allowing communication between the cavity and an exterior of the three-dimensional substrate is formed on the first flat surface, and has a labyrinth structure that causes a flow rate of air passing through the air passage to vary depending on a location in the air passage.
Preferably, the three-dimensional substrate has such a low light transmittance with respect to a region sensitive to light reception by the semiconductor imaging device that substantially no unwanted signal is generated. According to this configuration, with regard to the achievement of higher sensitivity of semiconductor imaging devices that is pursued along with the size reduction of imaging apparatuses, an influence of disturbance light can be reduced in an imaging apparatus, thus suppressing a functional deterioration of the imaging apparatus when used in portable equipment that is used outdoors frequently. Moreover, even when the imaging apparatus is used in so-called skeleton type portable equipment, which is future portable equipment that itself has a translucent housing, the entry of light entering from the periphery can be prevented reliably, making it possible to prevent a deterioration of an image with reliability
A method for manufacturing an imaging apparatus according to the present invention uses a three-dimensional substrate in which a partition wall having an opening at a central portion is formed so as to cross an inner cavity, an air passage with a non-linear structure for allowing communication between the opening and an exterior of the three-dimensional substrate is formed on a first flat surface of both surfaces of the partition wall, and a conductor land for connection is provided on a second flat surface of the partition wall. The method includes process steps of: fixing an optical filter on the first flat surface by bonding; installing a semiconductor imaging device with respect to the conductor land for connection provided on the second flat surface; sealing the semiconductor imaging device; and subsequently installing an optical system for forming images in the inner cavity of the three-dimensional substrate.
FIG. 1 is a perspective view of the imaging apparatus. A three-dimensional substrate 1 is composed of a base part 7 having a rectangular planar shape and a cylindrical barrel part 17 provided on the base part 7. The three-dimensional substrate 1 is formed from a glass reinforced PPA (polyphthalamide resin) or the like and is tinted black so as to prevent the transmission of external light therethrough. For the connection to the exterior, a terminal part 7a is provided on an outer side of the base part 7 of the three-dimensional substrate 1. AFPC (flexible printed circuit board) 15 for transmitting signals to and receiving signals from external equipment is disposed on a lower side of the base part 7, and a connection land 15a formed on the FPC 15 is connected to the terminal part 7a using solder 16. A lens 2 that is made of resin and fitted into a lens holder 20 is disposed in an inner cavity of the barrel part 17 of the three-dimensional substrate 1. The lens holder 20 is fixed on an outer side of the barrel part 17 by means of an adjusting ring 21 disposed on an outer side of the lens holder 20. The lens holder 20 is provided with a diaphragm 3. A semiconductor imaging device 4 and an optical filter 5 that suppresses the sensitivity to light in the infrared region are disposed on a boundary between the base part 7 and the barrel part 17.
The following describes the structure of the imaging apparatus in further detail with reference to FIGs. 2 and 3. FIG. 2 is a cross-sectional view of the imaging apparatus shown in FIG. 1 taken on line X-Y, FIG. 3 is an enlarged view of a portion denoted A in FIG. 2. A partition wall 11 is formed on a boundary between the base part 7 and the barrel part 17. An opening 10a is formed at a central portion of the partition wall 11, and upper and lower surfaces of the partition wall 11 that enclose the opening 10a respectively form a first flat surface 12 and a second flat surface 13 that are parallel to each other. The optical filter 5 is disposed on the first flat surface 12 on an upper side, and the semiconductor imaging device 4 as well as a chip component and the like that are not shown is disposed on the second flat surface 13 on a lower side. The optical filter 5 is fixed in a predetermined position on the first flat surface 12 using an adhesive 6. The opening 10a is formed in a rectangular shape so as to correspond to an imaging area of the semiconductor imaging device 4 that will be described later. All of these constituent components are assembled on the three-dimensional substrate 1.
As shown in FIG. 3, a wiring pattern 7b is formed on a back side of the base part 7 by electroless plating or the like. On an inner side of the second flat surface 13 in the three-dimensional substrate 1, a connection land 7c for bare-chip mounting the semiconductor imaging device 4 is provided. The connection land 7c is connected to the terminal part 7a by means of the wiring pattern 7b.
The semiconductor imaging device 4 is formed of, for example, a so-called 1/6-inch VGA CCD with about 320,000 pixels and face-down mounted with respect to the connection land 7c so as to be connected electrically to the connection land 7c. This is intended to perform bare-chip mounting using no package, thereby realizing the thickness reduction of the imaging apparatus. Face-down mounting is performed by, for example, so-called SBB (Stud Bump Bond) that is a c connection method using a bump 8 formed from gold and an Ag paste 8a that is a conductive adhesive containing silver as a conductive material and applied on the tip of the bump 8. The semiconductor imaging device 4, after being face-down mounted, is sealed with a sealant 9. An electric wiring is formed via the wiring pattern 7b and the connection land 15a of the FPC 15 (see FIG. 1), and used for the output of image signals to the exterior, which are obtained by the semiconductor imaging device 4 and the chip component and the like that are not shown, a control signal from the exterior, and power supply. Metal foil 14 (see FIG. 2) is attached on a back surface of the FPC 15 so as to prevent the entry of visible light and infrared light from the back surface into the semiconductor imaging device 4.
On the first flat surface 12 of the opening 10a provided in the three-dimensional substrate 1, on which the optical filter 5 is installed, an air passage 12a having a labyrinth structure is formed at a position axisymmetric with respect to the opening 10a. After the optical filter 5 and the semiconductor imaging device 4 are installed, the opening 10a constitutes a cavity 10, and air travels between the cavity 10 and the exterior only through the air passage 12a.
The lens 2 housed in the barrel part 17 is composed of two aspherical lenses (hereinafter, abbreviated as lenses) 2a and 2b that have different optical characteristics from each other and are fitted into the lens holder 20 in such a manner that constant positional relationship between them can be maintained. On an outer periphery of the lens holder 20 and on an inner periphery of the adjusting ring 21 disposed on the outer side of the lens holder 20, screws 20a and 21a that engage with each other are formed, respectively, so that the position of the lens holder 20 in an axial direction can be adjusted.
The lens 2 is formed from a resin that can satisfy required optical characteristics such as a transmittance, a refractive index and the like. This embodiment uses a lens as an example that is formed by injection molding using "ZEONEX" (trade name) manufactured by ZEON Corporation. For example, the lens 2 is composed of two lenses and achieves a so-called pan-focus that allows an image to be formed at a distance farther than a given distance. In this embodiment, for example, the lens 2 is set so that focus is achieved with respect to a subject at a distance farther than a distance of about 30 cm. These configurations and characteristics can be selected suitably.
The adhesive 6 for bonding the optical filter 5 is formed from, for example, a UV thermosetting adhesive that uses an epoxy resin as a base material. It is desirable to select a material for the adhesive 6 that has a coefficient of linear expansion in a range between the coefficient of linear expansion of the three-dimensional substrate 1 and the coefficient of linear expansion of the optical filter 5. This is intended to reduce stress to be exerted on the three-dimensional substrate 1 and the optical filter 5 at the time of heating, which is performed generally in a bonding/curing process, thereby preventing a deterioration of, for example, the flatness with respect to a mounting surface due to warping or the like. In this embodiment, for example, the three-dimensional substrate 1 has a coefficient of linear expansion of approximately 40 × 10-6 mm/mm°C, and the optical filter 5 has a coefficient of linear expansion of about 10 × 10-6 mm/mm°C. The adhesive 6 of an epoxy resin for fixing these components is adjusted to have a coefficient of linear expansion in the range between these coefficient values through adjustment of the content of a filler (not shown).
An end surface 10b facing the opening 10a is configured so that an area of the opening is increased toward the side of the semiconductor imaging device 4. Similarly to the above-described diaphragm 3, this is intended to prevent a phenomenon in which light that has impinged on the end surface 10b of the opening is diffused and enters the lens again as unwanted light. Although it also is possible to prevent this phenomenon by roughening the end surface or applying a matte coating for preventing reflection on the end surface, with the configuration according to this embodiment, it is only required to provide a needed taper on a mold for forming the three-dimensional substrate 1 made of resin by injection molding, thus eliminating the need to roughen the end surface or apply the matte coating. In the injection molding, this tapered portion can be utilized as a releasing taper, and thus the above-described configuration further is effective in obtaining excellent moldability and mold releasability at the time of molding. The imaging apparatus according to this embodiment is manufactured by processes in which the optical filter 5 and the semiconductor imaging device 4 are mounted on the three-dimensional substrate 1 so as to be formed into a module, and then the optical system is fabricated. It is desirable that the above-described fabrication be performed in an environment with high cleanliness.
The description is directed next to the light transmittance in the three-dimensional substrate 1 with reference to FIG. 4. FIG. 4A shows the sensitivity of the semiconductor imaging device 4 with respect to wavelengths in this embodiment. The semiconductor imaging device 4 according to this embodiment is formed from silicon, and an upper limit value on a long wavelength side in a sensitivity region of the semiconductor imaging device 4 is determined by a wavelength defined by the band gap energy (Eg) of silicon. Silicon generally has a band gap energy of about 1.12 eV at room temperature. Further, it is known that a limit value of a wavelength can be determined by λ≈1,240 / Eg, and thus a limit value on a long wavelength side of about 1,100 nm is obtained. On the other hand, the sensitivity on a short wavelength side extends to a value as short as about 200 nm in the ultraviolet region.
FIG. 4C shows the transmittance of the three-dimensional substrate 1 with respect to wavelengths. The three-dimensional substrate 1 is set to have a light transmittance that is sufficiently low with respect to a sensitivity region of the semiconductor imaging device 4. Specifically, carbon black and glass fiber are added to the resin material (PPA) of the three-dimensional substrate 1. Carbon black is effective with respect to visible light and light on a short wavelength side and has excellent dispersibility Further, with respect to light on a wavelength side longer than a wavelength of visible light, in order to control the light transmittance, a slight amount of a metal filler that has a high thermal conductivity is used or a resin material of an increased thickness is used for the three-dimensional substrate 1. These methods of controlling the transmittance can be selected suitably depending on the degree of an influence on an image.
Next, the air passage having the labyrinth structure will be described in detail with reference to FIG. 5. FIG. 5 is an exploded perspective view of an important portion showing the relationships among the optical filter 5, the three-dimensional substrate 1 and the semiconductor imaging device 4. Although the partition wall 11 is shown to have a rectangular shape for the sake of convenience, a peripheral portion of the partition wall 11 actually is continuous to the other portion of the three-dimensional substrate 1. On the first flat surface 12 of the partition wall 11 that is positioned on a boundary between the base part 7 and the barrel part 17 of the three-dimensional substrate 1 and forms the opening 10a, the air passages 12a having the labyrinth structure are provided at a position axisymmetric with respect to the opening 10a. An amount of an airflow that passes through the labyrinth structure varies depending on a location in the labyrinth structure. Based on Bernoulli's theorem, a variation in the amount of airflow causes a variation in pressure, so that foreign matter is trapped while traveling. This embodiment makes positive use of this phenomenon. The labyrinth structure according to this embodiment has a zigzag shape. A groove of the labyrinth structure has a width of 0.13 mm and a depth of 0.04 mm. One end of the groove reaches the opening 10a and the other end extends beyond an outer periphery of the optical filter 5 installed on the first flat surface 12. It is desirable that the other end of the groove be positioned in such a manner as to allow an enough margin with respect to a deviation of a position of the installed optical filter 5.
In the semiconductor imaging device 4, an electric signal of an image obtained from an imaging area 4a in which effective pixels are arranged is led out to a Pad part 4b disposed on a periphery by means of an internal wiring formed from aluminum or the like, which is not shown. On the Pad part 4b, a gold wire formed into a required shape is provided as the bump 8 by a bump bonder. The bump 8 is used to establish an electrical connection between the three-dimensional substrate 1 and the connection land 7c. Although it also should be noted that the bump have an optimum shape according to the flatness of the second flat surface 13 and a joining method, detailed description thereof is omitted.
The air passage 12a has a zigzag shape and thus is set so that a flow rate of air passing therethrough varies depending on a location in the air passage 12a. Based on Bernoulli's principle, a variation in the flow rate causes a variation in pressure. Due to this variation in pressure, foreign matter being entrained in air flowing in/out is captured in the air passage 12a. As described above, in a module fabricated in an environment with high cleanliness, the cavity 10 formed as a result of enclosing the opening 10a is assumed to be free from foreign matter. Air in the opening 10 may flow in/out depending on temperature and pressure differences from those of ambient air. However, since foreign matter contained in the air flowing in is captured by the air passage 12a, the cavity 10 always is kept in a state of being free from foreign matter.
As described above, in fabricating an imaging apparatus, before fabricating an optical system, the optical filter 5 and the semiconductor imaging device 4 are installed on the three-dimensional substrate 1. Abonding or sealing process in this fabrication includes heating/cooling an entire module, which causes expansion/contraction of air in the cavity 10. If the air in the cavity 10 does not flow in from and out to the exterior, an internal pressure increases to cause a sealant to be pushed away, so that sealing at a predetermined position may be hindered in the fabrication of the module, and moreover, an increase in the internal pressure also may cause the optical filter 5 to be broken, which have been disadvantageous. In order to avoid this, in a known conventional method, an air purging hole is provided. However, this method requires an operation of closing the hole at a later stage, and foreign matter generated by a material used to close the hole or foreign matter produced in the closing operation may enter the cavity 10, which has been disadvantageous. Further, in curing equipment used for curing a sealant or an adhesive, although full attention is paid to keeping the cleanliness of the environment, due to dust generated when the sealant or the adhesive is cured, foreign matter is likely to be present compared with other clean environments, and thus cleanliness tends be lowered. Under this environment, when air in the cavity 10 expands and then contracts, surrounding air is taken into the cavity. Against such air movement, the provision of an air passage can prevent the entry of foreign matter reliably. This can prevent reliably the adherence of foreign matter to the surface of the semiconductor imaging device 4, which is most likely to have an influence on image quality, thereby allowing a more reliable imaging apparatus to be obtained.
With an increasing demand for smaller imaging apparatuses with higher quality, it also has become necessary that the semiconductor imaging device 4 is bare-chip mounted. Therefore, in order to achieve thickness reduction without deteriorating reliability, it is effective that foreign matter entrained in air flowing in/out of the cavity 10 is captured by the air passage 12a having the labyrinth structure.
The labyrinth structure of the air passage 12a according to this embodiment has a zigzag shape extending linearly from a center of the opening 10 to an outer side. However, the labyrinth structure may have a shape inclined as a whole such as of an air passage 12b shown in FIG. 6A or a circular-arc shape such as of an air passage 12c shown in FIG. 6B. Further, the groove of the labyrinth structure may have a width and a depth that vary depending on a location in the labyrinth structure. Also in these cases, in order not to incur a cost increase, it is preferable that the air passage 12a is shaped using a mold for forming the three-dimensional substrate 1 by resin molding. As described above, the labyrinth structure according to this embodiment can be defined as a structure in which the air passage 12a has a planar shape such that a flow rate of air passing through the air passage 12a varies depending on a location in the air passage 12a.
With the air passages 12a provided at a position axisymmetric with respect to the opening 10a, stress generated due to, for example, thermal stress exerted when the optical filter 5 is fixed on the first flat surface 12 by bonding can be adjusted so as to be balanced with respect to the opening 10a. Thus, a deterioration of the flatness of the second flat surface 13 for mounting the semiconductor imaging device 4 can be prevented reliably. Generally, in the case where the semiconductor imaging device 4 is face-down mounted on the second flat surface 13 by a connection method such as BGA (Ball Grid Array) or SBB, the flatness of a portion used for connection should be suppressed to about half the height of the bump 8, and it is desirable that the flatness be not more than about 30 µm. Therefore, it is necessary to minimize factors that deteriorate the flatness of the second flat surface 13.
The description is directed next to a labyrinth structure of an air passage according to another embodiment with reference to FIGs. 6C to 6F. An air passage 12d shown in FIG. 6C is provided with ribs 18. Since the ribs 18 are present, the height of the air passage 12d with respect to a thickness direction of the optical filter 5 varies along a flow path. FIG. 6D shows an enlarged view of the ribs 18. According to this structure, a gap formed between the optical filter 5 and the labyrinth structure varies in cross-sectional area along the air passage 12d. This can cause a flow rate of air passing through the air passage 12d to vary with the height of the gap.
The gap formed between an upper surface of the ribs 18 and the optical filter 5 has, for example, a minimum size of 30 µm and a width of 0.4 mm. These dimensions can be selected suitably according to characteristics of a semiconductor imaging device, a pixel size, manufacturing conditions used in processes and the like. Moreover, the ribs 18 have a shape tapered toward a tip portion. This shape is employed in consideration of the following. That is, when forming the three-dimensional substrate 1 by injection molding, this shape can be obtained using a so-called impression formed in a mold. Further, this shape provides the effect of allowing a releasing taper to be formed so as to improve mold releasability.
FIG. 6E shows an embodiment in which the ribs 18 shown in FIG. 6D is modified. A labyrinth structure in this case has ribs 18a to 18c. The ribs 18a to 18c have a height decreased in this order. According to this structure, the ribs 18a to 18c have a height varying depending on a position in a flow direction of an air passage. This can cause a flow rate to vary in a larger degree, and thus foreign matter is captured more effectively. The order of arrangement of the respective heights of the ribs 18a to 18c can be changed suitably. Further, it is preferable that, similarly to the ribs 18 shown in FIG. 6D, the ribs 18a to 18c have a shape that can be obtained using a so-called impression formed in a mold and provides the effect of allowing a releasing taper to be formed so as to improve mold releasability.
In a labyrinth structure of an air passage 12e shown in FIG. 6F, a concave part 19a is formed on a side edge of the air passage 12e in the first flat surface 12. With the concave part 19a, while the height of the air passage 12e does not vary with respect to the thickness direction of the optical filter 5, the width of the air passage 12e varies along a flow direction. This allows a gap formed between the optical filter 5 and the labyrinth structure to vary in the area of a cross section orthogonal to a direction of an airflow. According to this configuration, a flow rate of air passing through the air passage 12e varies with a cross-sectional area, and thus foreign matter is captured. In a position of the concave part 19a, a deeper concave part 19b may be provided so that foreign matter that has been captured is captured securely by the deep concave part 19b.
The concave part 19a has a depth of, for example, 50 µm, and the width of the air passage 12e is, for example, 0.4 mm at the widest point and a 0.15 mm at the narrowest point. Moreover, the deep concave 19b has a cylinder shape that is, for example, 0.15 mm in depth and 0.15 mm in diameter. These dimensions can be selected suitably according to characteristics of a semiconductor imaging device, a pixel size, manufacturing conditions used in processes and the like.
It also is possible to use the labyrinth structures according to the above-described embodiments in combination so as to allow greater design freedom. For example, the ribs 18 shown in FIG. 6D may be arranged in a portion of the concave part 19a in the labyrinth structure shown in FIG. 6F so that a variation in height is obtained.
First, in a pretreatment performed in Step S30, the three-dimensional substrate is subjected to baking and cleaning so that moisture contained in a slight amount in the three-dimensional substrate is eliminated. It is preferable that, particularly, conditions for eliminating moisture are determined based on an evaluation of a final product, though they also may depend on heating conditions. Next, in Step S31, the optical filter 5 that has been cleaned is placed in a desired position on the first flat surface 12 of the three-dimensional substrate 1. At this time, as well as positioning of the optical filter 5, a front or back of the optical filter 5 is checked as necessary. Next, in Step 32, a fixed amount of the adhesive 6 made of a UV thermosetting epoxy resin for fixing the optical filter 5 to the three-dimensional substrate 1 is applied using a dispenser. Next, in Step 33, the adhesive 6 is irradiated with UV light. This allows a cure initiator contained in the adhesive to be activated to start curing. Next, in Step S34, heating is performed at 150°C so that the curing of the adhesive 6 that has been initiated using the UV light is performed completely. Thus, the optical filter 5 is fixed at the desired position of the three-dimensional substrate 1. Next, in Step S35, the three-dimensional substrate 1 on which the optical filter 5 is fixed is turned upside down and set in equipment for mounting the semiconductor imaging device 4.
The following describes the process steps in which the semiconductor imaging device 4 is prepared for mounting. In Step S36, the bump 8 for connection is bonded to the Pad part 4b of a bare chip that is formed by dicing of a wafer and constitutes the semiconductor imaging device 4. 1b this end, a gold wire is heated and discharged from a nozzle referred to as a capillary so as to form the bump 8. Next, in Step S37, a tip portion of the bump 8 is deformed plastically so that the bump 8 is adjusted to have a predetermined height. Next, in Step 38, as a conductive adhesive for electrically connecting the bump 8 and the connection land 7c of the three-dimensional substrate 1, an Ag paste is transferred onto the tip portion of the bump 8. Since connection reliability may be affected by the shape of the tip portion of the bump 8, the viscosity and conductivity the Ag paste, and the like, it is desirable that full consideration be given in setting conditions.
The following describes the process steps from a step of mounting the semiconductor imaging element 4 to the step of completing the module. In Step S40, using a pattern recognizer or the like, positioning is performed so that the semiconductor imaging device 4 and the connection land 7c of the three-dimensional substrate 1 are aligned with respect to each other, and the semiconductor imaging device 4 is placed on the second flat surface 13 of the three-dimensional substrate 1. Next, in Step 41, the Ag paste on the tip portion of the bump 8 provided on the semiconductor imaging device 4 is cured by heating at 80°C. Next, in Step S42, a sealant for shielding the semiconductor imaging device 4 from ambient air is applied. Next, in Step 43, the sealant is cured by heating at 125°C. Temperature conditions for these process steps can be selected suitably depending on an adhesive, equipment and the like that are used.
Furthermore, in heating processes performed in Steps S41 to 43, air in the cavity 10 expands/contracts. According to this embodiment, the air in the cavity 10 can flow in and out by means of the air passage 12a. Therefore, an internal pressure of the cavity 10 does not increase, and thus a phenomenon is avoided in which a sealant is pushed away, so that sealing at a predetermined position is hindered in the fabrication of the module and moreover, the optical filter 5 breaks. In addition, the air passage 12 having the labyrinth structure, while allowing air to flow in and out, prevents the entry of foreign matter reliably, and thus the adherence of the foreign matter to the surface of the semiconductor imaging device 4 can be prevented reliably. This facilitates the thickness reduction of imaging apparatuses.
a three-dimensional substrate in which a partition wall having an opening at a central portion is formed so as to cross an inner cavity;
wherein an air passage for allowing communication between the cavity and an exterior of the three-dimensional substrate is formed on the first flat surface, and has a labyrinth structure that causes a flow rate of air passing through the air passage to vary depending on a location in the air passage.
The imaging apparatus according to any one of claims 1 to 3,
A method for manufacturing an imaging app aratus that uses a three-dimensional substrate in which a partition wall having an opening at a central portion is formed so as to cross an inner cavity, an air passage with a non-linear structure for allowing communication between the opening and an exterior of the three-dimensional substrate is formed on a first flat surface of both surfaces of the partition wall, and a conductor land for connection is provided on a second flat surface of the partition wall, comprising process steps of
subsequently installing an optical system for forming images in the inner cavity of the three-dimensional substrate.
EP04734931A 2003-05-30 2004-05-26 Imaging device and its manufacturing method Active EP1631060B1 (en)
EP1631060A1 true EP1631060A1 (en) 2006-03-01
EP1631060A4 EP1631060A4 (en) 2007-08-01
EP1631060B1 EP1631060B1 (en) 2008-11-05
EP04734931A Active EP1631060B1 (en) 2003-05-30 2004-05-26 Imaging device and its manufacturing method
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