JPWO2006100907A1 - Imaging device and portable wireless communication terminal - Google Patents

Abstract

An imaging apparatus that realizes an imaging apparatus having a light amount control means such as a shutter unit in a small size and at low cost. In this image pickup apparatus, in the image pickup apparatus in which the image pickup element is mounted on the main part (1a) of the printed wiring board (1) and the image pickup signal is led out from the flexible part, the coil (4) which is a drive side member of the electromagnetic actuator. Is connected to the main part (1a) by reflow soldering and the coil (4) is fixed to the main part (1a). After fixing the coil (4), the shutter unit (3) incorporating the lens unit (2) and the permanent magnet (3b) as the driven member of the electromagnetic actuator is assembled on the image sensor.

Description

  The present invention relates to an imaging device and a portable wireless communication terminal equipped with the imaging device.

Conventionally, in an imaging device, as shown in FIG. 1, a subject is imaged by an imaging element (not shown) mounted on a printed wiring board 11 via a shutter unit 13 and a lens unit 12. In this case, the amount of light incident on the image sensor from the subject is controlled by the shutter unit 13. For this light quantity control, an electromagnetic actuator is built in the electromagnetic actuator section 13 a of the shutter unit 13. The electromagnetic actuator itself is formed by integrating a coil that is a driving unit side member and a permanent magnet that is a driven side member, and a flexible printed wiring provided separately from the printed wiring board 11 to energize the electromagnetic actuator. This is performed via the substrate 14 (see, for example, Patent Document 1).
JP-A-9-325381 (FIG. 6)

  However, when the flexible printed wiring board 14 for applying an electric signal to the electromagnetic actuator is pulled out separately from the printed wiring board 11 on which the core of the imaging device is mounted as in the conventional case, the flexible printed wiring board 14 is pulled out. It is necessary to connect to the printed wiring board 11 or to a main wiring board such as a mobile phone on which this imaging device is mounted. For this purpose, there is a problem that it is difficult to reduce the size and cost of the imaging apparatus, such as the necessity of securing an extra space for connection and the necessity of a member for connection such as a connector. is there.

  An object of the present invention is to provide a small-sized and low-cost imaging device and a portable wireless communication terminal.

  An image pickup apparatus of the present invention includes an image pickup device or a printed wiring board on which an image pickup device package is mounted, a lens unit, and a light amount control unit that controls a light amount from a subject by driving an electromagnetic actuator. Then, a configuration is adopted in which a coil portion that is a driving side member of the electromagnetic actuator is mounted and fixed on the printed wiring board, and a permanent magnet portion that is a driven side member of the electromagnetic actuator is built in the light amount control means.

  According to the present invention, the coil portion that is the driving side member of the electromagnetic actuator is separated from the permanent magnet portion that is the driven side member, and is mounted and fixed to the printed wiring board on which the imaging element or the like is mounted. Therefore, it is not necessary to provide an independent flexible printed wiring board for energizing the coil, and a small and low-cost imaging device and portable wireless communication terminal can be realized.

A perspective view showing an example of a conventional imaging device 1 is a perspective view of an imaging apparatus according to an embodiment of the present invention. 1 is a perspective view of an imaging apparatus according to an embodiment of the present invention. The perspective view explaining the coil mounting method of the imaging device which concerns on one embodiment of this invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
2 and 3 are perspective views of the imaging apparatus according to the embodiment of the present invention. FIG. 2 shows a state where the shutter is closed, and FIG. 3 shows a state where the shutter is opened. FIG. 4 is a perspective view for explaining a coil mounting method of the imaging apparatus according to the embodiment of the present invention.

  2 and 3, the image pickup apparatus has a printed wiring board 1, and an image pickup device package (not shown) is mounted on a main part 1 a of the printed wiring board 1, and a lens unit 2 and a shutter are mounted thereon. Unit 3 is mounted. The subject is imaged by the image sensor via the shutter unit 3 and the lens unit 2 and converted into an electrical signal.

  The printed wiring board 1 is a multilayer board formed by a build-up method or the like, and has a main part 1a having high rigidity and a flexible part 1b configured flexibly. On the printed circuit board 1, an image pickup device such as a CCD device or an image pickup device package (not shown) in which an image pickup device and peripheral electronic components are packaged is mounted on a main portion 1a. An imaging signal obtained by the imaging element is led out through the main part 1a and the flexible part 1b.

  The lens unit 2 is fixed with a desired mounting accuracy on the package of the image sensor. The lens unit 2 is for optically forming a subject image on an image sensor, and at least one lens made of glass or plastic material is mounted on a polycarbonate barrel, and in many cases, two or more lenses are mounted. Yes. For this reason, the lens unit 2 has low heat resistance.

  A shutter unit 3 for controlling the amount of light is assembled on the top of the lens unit 2. The shutter unit 3 is provided with an opening 3d corresponding to the opening (not shown) of the lens unit 2. As shown in FIGS. 2 and 3, the shutter unit 3 includes a shutter plate 3a and a permanent magnet 3b. The permanent magnet 3b constitutes a part (driven member) of an electromagnetic actuator for driving the shutter plate 3a.

  The coil 4 which is a drive side member of the electromagnetic actuator is mounted on the main part 1a of the printed wiring board 1 as shown in FIGS. The coil 4 has a winding 4a and a yoke 4b. The winding 4a is wound around a bobbin, and the terminal end of the winding 4a is fixed to the bottom portion of the bobbin flange 4c facing the terminal 1c of the printed wiring board 1. Since the coil 4 has high heat resistance like the image sensor and its peripheral electronic components, it can be directly mounted on the two terminal portions 1c (lands) provided on the printed wiring board 1 by reflow soldering or the like.

  With such a configuration, when the coil 4a of the coil 4 is energized, a magnetic field is generated, and the magnetic field is applied to the permanent magnet 3b through the yoke 4b in a non-contact manner. As the magnetic field is applied, the coil 4 and the permanent magnet 3b are attracted and repelled, whereby the shutter plate 3a obtains a driving force and rotates about the rotation shaft 3c. In accordance with this rotation, the amount of light passing through the opening 3d is controlled.

  Thus, in this Embodiment, the coil 4 which is a drive side member of an electromagnetic actuator is a different body from the permanent magnet 3b which is a driven side member of an electromagnetic actuator. Therefore, the coil 4 can be mounted and fixed to the main part 1a of the printed wiring board 1 by a method such as reflow soldering simultaneously with other electrical components having no heat resistance problem, such as an image sensor. When mounted on the printed circuit board 1, the coil 4 can be directly energized through the printed pattern formed on the main part 1a and the flexible part 1b. Therefore, the flexible part for energizing the coil part as in the conventional example. There is no need to provide a separate wiring board, and there is no need for extra members, extra joining space, or extra steps.

  In this way, the main part 1a of the printed wiring board 1 has high heat resistance among the core parts of the electric parts of the imaging device such as the coil 4, other electric parts (not shown), and the package of the imaging element (not shown). The parts are mounted by reflow soldering. Thereafter, the lens unit 2 and the shutter unit 3 having low heat resistance are mounted and assembled so as to be stacked in order.

  The lens unit 2 is bonded and fixed to the package of the image sensor or the printed wiring board 1 with an ultraviolet curable adhesive or the like that does not need to be heated. Next, the shutter unit 3 is fitted to the lens unit 2 and bonded using a processing method that does not cause thermal damage to the lens unit 2 or the shutter unit 3 such as screwing or bonding. As a result, the shutter unit 3 is mounted on the package of the image sensor.

  At this time, the permanent magnet 3b of the shutter unit 3 is assembled with respect to the coil 4 mounted on the printed wiring board 1 so as to be arranged at a predetermined position with a desired accuracy as shown in FIGS. At this time, the permanent magnet 3b and the coil 4 are separate from each other. However, the magnetic flux generated when the coil 4 is energized with the permanent magnet 3b and the coil 4 in a predetermined positional relationship passes through the yoke 4b. By guiding to 3b and changing the energization direction to the coil 4, it becomes possible to generate thrust in different directions in the permanent magnet 3b. As the permanent magnet 3b moves between the pair of yokes 4b, the shutter plate 3a swings about the rotation shaft 3c of the shutter plate, the opening degree of the opening 3d is controlled, and the amount of light passing through is controlled.

  With this configuration, in the imaging apparatus according to this embodiment, imaging light from the object to be imaged is sent to the imaging element (not shown) via the opening 3d of the shutter unit 3 and the lens unit 2. ) To obtain an imaging signal. This imaging signal is derived to the outside through a print pattern formed on the main part 1a and the flexible part 1b of the printed wiring board 1.

  In the imaging apparatus according to the present embodiment, since the energization to the coil 4 is performed by using the printed wiring board 1 also, an extra portion such as the flexible printed wiring board 14 as in the conventional example is used. It does not require a new member. Further, mounting restrictions are not imposed by members having low heat resistance such as the lens unit 2, the shutter plate 3a, and the permanent magnet 3b. As described above, in the imaging apparatus according to the present embodiment, the reflow soldering process, which is an indispensable process in many cases, is extremely effective in that the electrical connection to the shutter unit or the like is substantially completed. It is done. Also, as a matter of course, since no extra connection space or process is required, space saving and low cost can be realized at the same time.

  Further, since no extra members or structures for connection are required, the environment resistance and the reliability against drop impacts are improved.

  In addition, a mobile wireless communication terminal such as a mobile phone can be configured by mounting the imaging device according to the present embodiment. In this case, if the coil 4 is mounted by directly connecting the terminal end of the coil winding 4a to the main body wiring board of the portable radio communication terminal, the portable radio communication terminal can be realized in a small size and at low cost.

  In this embodiment, an example in which the light amount control unit is a shutter is shown. However, the present invention is not limited to this, and the light amount control unit may be a neutral density filter, a diaphragm, a light shielding film, or the like. The same effect can be obtained even when a plurality of control means and other optical means are mounted.

  This specification is based on Japanese Patent Application No. 2005-081672 of an application on March 22, 2005. All this content is included here.

  The present invention is useful for realizing a small-sized and low-cost imaging device. In addition, by incorporating such an imaging device into a mobile phone or the like, it is useful for downsizing, cost reduction, and high reliability of a mobile wireless communication terminal such as a mobile phone.

  The present invention relates to an imaging device and a portable wireless communication terminal equipped with the imaging device.

Conventionally, in an imaging device, as shown in FIG. 1, a subject is imaged by an imaging element (not shown) mounted on a printed wiring board 11 via a shutter unit 13 and a lens unit 12. In this case, the amount of light incident on the image sensor from the subject is controlled by the shutter unit 13. For this light quantity control, an electromagnetic actuator is built in the electromagnetic actuator section 13 a of the shutter unit 13. The electromagnetic actuator itself is formed by integrating a coil that is a driving unit side member and a permanent magnet that is a driven side member, and a flexible printed wiring provided separately from the printed wiring board 11 to energize the electromagnetic actuator. This is performed via the substrate 14 (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-325381 (FIG. 6)

  However, when the flexible printed wiring board 14 for applying an electric signal to the electromagnetic actuator is pulled out separately from the printed wiring board 11 on which the core of the imaging device is mounted as in the conventional case, the flexible printed wiring board 14 is pulled out. It is necessary to connect to the printed wiring board 11 or to a main wiring board such as a mobile phone on which this imaging device is mounted. For this purpose, there is a problem that it is difficult to reduce the size and cost of the imaging apparatus, such as the necessity of securing an extra space for connection and the necessity of a member for connection such as a connector. is there.

  An object of the present invention is to provide a small-sized and low-cost imaging device and a portable wireless communication terminal.

  An image pickup apparatus of the present invention includes an image pickup device or a printed wiring board on which an image pickup device package is mounted, a lens unit, and a light amount control unit that controls a light amount from a subject by driving an electromagnetic actuator. Then, a configuration is adopted in which a coil portion that is a driving side member of the electromagnetic actuator is mounted and fixed on the printed wiring board, and a permanent magnet portion that is a driven side member of the electromagnetic actuator is built in the light amount control means.

  According to the present invention, the coil portion that is the driving side member of the electromagnetic actuator is separated from the permanent magnet portion that is the driven side member, and is mounted and fixed to the printed wiring board on which the imaging element or the like is mounted. Therefore, it is not necessary to provide an independent flexible printed wiring board for energizing the coil, and a small and low-cost imaging device and portable wireless communication terminal can be realized.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment)
2 and 3 are perspective views of the imaging apparatus according to the embodiment of the present invention. FIG. 2 shows a state where the shutter is closed, and FIG. 3 shows a state where the shutter is opened. FIG. 4 is a perspective view for explaining a coil mounting method of the imaging apparatus according to the embodiment of the present invention.

  2 and 3, the image pickup apparatus has a printed wiring board 1, and an image pickup device package (not shown) is mounted on a main part 1 a of the printed wiring board 1, and a lens unit 2 and a shutter are mounted thereon. Unit 3 is mounted. The subject is imaged by the image sensor via the shutter unit 3 and the lens unit 2 and converted into an electrical signal.

  The printed wiring board 1 is a multilayer board formed by a build-up method or the like, and has a main part 1a having high rigidity and a flexible part 1b configured flexibly. On the printed circuit board 1, an image pickup device such as a CCD device or an image pickup device package (not shown) in which an image pickup device and peripheral electronic components are packaged is mounted on a main portion 1a. An imaging signal obtained by the imaging element is led out through the main part 1a and the flexible part 1b.

  The lens unit 2 is fixed with a desired mounting accuracy on the package of the image sensor. The lens unit 2 is for optically forming a subject image on an image sensor, and at least one lens made of glass or plastic material is mounted on a polycarbonate barrel, and in many cases, two or more lenses are mounted. Yes. For this reason, the lens unit 2 has low heat resistance.

  A shutter unit 3 for controlling the amount of light is assembled on the top of the lens unit 2. The shutter unit 3 is provided with an opening 3d corresponding to the opening (not shown) of the lens unit 2. As shown in FIGS. 2 and 3, the shutter unit 3 includes a shutter plate 3a and a permanent magnet 3b. The permanent magnet 3b constitutes a part (driven member) of an electromagnetic actuator for driving the shutter plate 3a.

  The coil 4 which is a drive side member of the electromagnetic actuator is mounted on the main part 1a of the printed wiring board 1 as shown in FIGS. The coil 4 has a winding 4a and a yoke 4b. The winding 4a is wound around a bobbin, and the terminal end of the winding 4a is fixed to the bottom portion of the bobbin flange 4c facing the terminal 1c of the printed wiring board 1. Since the coil 4 has high heat resistance like the image sensor and its peripheral electronic components, it can be directly mounted on the two terminal portions 1c (lands) provided on the printed wiring board 1 by reflow soldering or the like.

  With such a configuration, when the coil 4a of the coil 4 is energized, a magnetic field is generated, and the magnetic field is applied to the permanent magnet 3b through the yoke 4b in a non-contact manner. As the magnetic field is applied, the coil 4 and the permanent magnet 3b are attracted and repelled, whereby the shutter plate 3a obtains a driving force and rotates about the rotation shaft 3c. In accordance with this rotation, the amount of light passing through the opening 3d is controlled.

Thus, in this Embodiment, the coil 4 which is a drive side member of an electromagnetic actuator is a different body from the permanent magnet 3b which is a driven side member of an electromagnetic actuator. Therefore, the coil 4 can be mounted and fixed to the main part 1a of the printed wiring board 1 by a method such as reflow soldering simultaneously with other electrical components having no heat resistance problem, such as an image sensor. When mounted on the printed circuit board 1, the coil 4 can be directly energized through the printed pattern formed on the main part 1a and the flexible part 1b. Therefore, the flexible part for energizing the coil part as in the conventional example. There is no need to provide a separate wiring board, and there is no need for extra members, extra joining space, or extra steps.

  In this way, the main part 1a of the printed wiring board 1 has high heat resistance among the core parts of the electric parts of the imaging device such as the coil 4, other electric parts (not shown), and the package of the imaging element (not shown). The parts are mounted by reflow soldering. Thereafter, the lens unit 2 and the shutter unit 3 having low heat resistance are mounted and assembled so as to be stacked in order.

  The lens unit 2 is bonded and fixed to the package of the image sensor or the printed wiring board 1 with an ultraviolet curable adhesive or the like that does not need to be heated. Next, the shutter unit 3 is fitted to the lens unit 2 and bonded using a processing method that does not cause thermal damage to the lens unit 2 or the shutter unit 3 such as screwing or bonding. As a result, the shutter unit 3 is mounted on the package of the image sensor.

  At this time, the permanent magnet 3b of the shutter unit 3 is assembled with respect to the coil 4 mounted on the printed wiring board 1 so as to be arranged at a predetermined position with a desired accuracy as shown in FIGS. At this time, the permanent magnet 3b and the coil 4 are separate, but the magnetic flux generated when the coil 4 is energized through the yoke 4b so that the permanent magnet 3b and the coil 4 are in a predetermined positional relationship. By guiding to 3b and changing the energization direction to the coil 4, it becomes possible to generate thrust in different directions in the permanent magnet 3b. As the permanent magnet 3b moves between the pair of yokes 4b, the shutter plate 3a swings about the rotation shaft 3c of the shutter plate, the opening degree of the opening 3d is controlled, and the amount of light passing through is controlled.

  With this configuration, in the imaging apparatus according to this embodiment, imaging light from the object to be imaged is sent to the imaging element (not shown) via the opening 3d of the shutter unit 3 and the lens unit 2. ) To obtain an imaging signal. This imaging signal is derived to the outside through a print pattern formed on the main part 1a and the flexible part 1b of the printed wiring board 1.

  In the imaging apparatus according to the present embodiment, since the energization to the coil 4 is performed by using the printed wiring board 1 also, an extra portion such as the flexible printed wiring board 14 as in the conventional example is used. It does not require a new member. Further, mounting restrictions are not imposed by members having low heat resistance such as the lens unit 2, the shutter plate 3a, and the permanent magnet 3b. As described above, in the imaging apparatus according to the present embodiment, the reflow soldering process, which is an indispensable process in many cases, is extremely effective in that the electrical connection to the shutter unit or the like is substantially completed. It is done. Also, as a matter of course, since no extra connection space or process is required, space saving and low cost can be realized at the same time.

  Further, since no extra members or structures for connection are required, the environment resistance and the reliability against drop impacts are improved.

  In addition, a mobile wireless communication terminal such as a mobile phone can be configured by mounting the imaging device according to the present embodiment. In this case, if the coil 4 is mounted by directly connecting the terminal end of the coil winding 4a to the main body wiring board of the portable radio communication terminal, the portable radio communication terminal can be realized in a small size and at low cost.

  In this embodiment, an example in which the light amount control unit is a shutter is shown. However, the present invention is not limited to this, and the light amount control unit may be a neutral density filter, a diaphragm, a light shielding film, or the like. The same effect can be obtained even when a plurality of control means and other optical means are mounted.

This specification is based on Japanese Patent Application No. 2005-081672 of an application on March 22, 2005. All this content is included here.

  The present invention is useful for realizing a small-sized and low-cost imaging device. In addition, by incorporating such an imaging device into a mobile phone or the like, it is useful for downsizing, cost reduction, and high reliability of a mobile wireless communication terminal such as a mobile phone.

A perspective view showing an example of a conventional imaging device 1 is a perspective view of an imaging apparatus according to an embodiment of the present invention. 1 is a perspective view of an imaging apparatus according to an embodiment of the present invention. The perspective view explaining the coil mounting method of the imaging device which concerns on one embodiment of this invention

Claims (4)

An image sensor or a package of the image sensor is mounted and a printed wiring board that is energized;
A lens unit;
A light amount control means for controlling the light amount from the subject by driving the electromagnetic actuator,
An imaging apparatus in which a coil portion that is a driving side member of the electromagnetic actuator is mounted and fixed on the printed wiring board, and a permanent magnet portion that is a driven side member of the electromagnetic actuator is built in the light amount control means.   The imaging apparatus according to claim 1, wherein after the coil unit is mounted on the printed wiring board, the lens unit is assembled on the upper part of the imaging element, and the light amount control unit is assembled on the upper part of the lens unit.   The image pickup apparatus according to claim 1, wherein the image pickup element or the image pickup element package and the coil portion are fixed to the printed wiring board by reflow soldering.   A portable wireless communication terminal equipped with the imaging device according to claim 1.

Images