1. Field of the Invention
The present invention relates to a camera system for a vehicle, and to a method for manufacturing such a camera system.
2. Description of the Related Art
Camera systems for vehicles are used in particular for detecting an exterior space outside of the vehicle through a vehicle windshield and/or for detecting an interior of the vehicle. Camera systems and camera modules in general have a lens system, which includes a lens mount and at least one lens, an image sensor and a carrier device, on which the image sensor is mounted and with which it is contacted. This carrier device is designed as a circuit board, for example. The lens system is accommodated in a lens system mount, so that it is longitudinally adjustable to enable an adjustment. The lens system mount is generally mounted on the carrier device. In fixed-focus cameras, the lens system is inserted permanently into the lens system mount.
The imager module formed from a carrier device, a camera and an image sensor is subsequently contacted with a planar circuit carrier, generally a printed circuit board (PCB), on which electronic components, such as a microcontroller, for example, for activation of and readout from the image sensor and optionally interface units for contacting the camera system in the vehicle, for example, on the CAN bus, are provided. The imager module and the circuit carrier are generally accommodated in a camera housing, which may be fastened in the vehicle via a camera mount, for example. DE 10 2009 027 514 A1 describes one such camera system.
The shape of the camera housing is to be adapted to the respective mounting position in the vehicle. The longitudinal extent of the circuit carrier in particular may be obstructive when the installation space is narrow, for example, in the area of the windshield. Camera modules are therefore generally designed individually, i.e., specifically having a different position and layout of the circuit carrier with respect to the optical axis.
Disadvantages in general include the complex manufacture from a plurality of components having corresponding tolerances as well as the contact of the different components, in particular when there are different shapes and positions relative to one another.
According to the present invention, the carrier device has three-dimensional contours and has a lens system mounting area for mounting the lens and a conduction area, which has conductor tracks for contacting the image sensor. The image sensor may be fastened directly to the carrier device in particular, i.e., without complex chip sockets. In this way, the image sensor may be mounted in particular in the area of a recess or an opening in the carrier device, in particular in flip-chip technology, in which the sensitive sensor surface is directed through the recess to the lens system.
The number of components and thus also the tolerances are minimized due to such a design. The carrier device in particular may be designed as an MID (molded interconnect device) and may thus form the lens system mounting area and the conduction area and thereby provide conductor tracks for contacting the image sensor.
Contacting of the conduction area with the circuit carrier advantageously takes place in a (lower) end section of the carrier device. The end section or a lower edge of the carrier device may advantageously be placed in or through a recess in the circuit carrier and may thus be contacted with the bottom side of the circuit carrier, for example.
According to the present invention, it is recognized that the design of bond connections for contacting the conduction area of the carrier device and the circuit carrier may be problematic since it is difficult for technical reasons to apply bond connections or wire bonds between differently positioned contact surfaces, in particular also due to the tolerances. According to the present invention, it is therefore recognized that the contact surfaces should run in parallel to one another. It is also recognized here that this parallel arrangement in particular is more relevant than the height of the contact surfaces being the same, so that a vertical offset of the contact surfaces is fundamentally not such a disadvantage with respect to the plane of the contact surfaces.
Thus, according to the present invention, parallel contact surfaces or contact areas are formed.
According to one embodiment, the first contact pad of the carrier device is not planar but instead is designed to be curved. It advantageously has a convex curvature. A contact area in the curved first contact pads of the carrier device is selected, which runs in parallel to the second contact surface of the circuit carrier.
A parallel arrangement or orientation of two contact surfaces, of which at least one is nonplanar, is understood here to be a design in which a tangent or a tangential plane on the non-curved area runs in parallel to the other contact surface.
Due to the nonplanar design of the contact pad, a fitting contact area, which is parallel to the other contact surface, may thus be selected in each case in the event of different installation positions.
A few advantages are thus already achieved. Uniform carrier devices having curved contact pads may be formed and used in various camera systems. The curved contact pads may be formed at different installation angles of the conduction carrier plate with respect to the carrier device and with respect to its optical axis or its conduction area, there being nevertheless a secure contact, in that the position of a suitable first contact area of the first contact pad having a parallel alignment with the second contact surface of the circuit carrier plate is selected.
Thus, for different systems, only reprogramming of the contact tool is necessary without any new structural design of relevant larger components.
Multiple contacts may be contacted to one another by placing the first contact pads and second contact pads side by side laterally, so that essentially identical or similar bond connections are created and may thus be calculated jointly.
According to an alternative embodiment, parallel contact surfaces may be created by fastening a bond contact part onto the circuit carrier. The bond contact part may have a support surface and a contact surface in particular, which form an angle to one another, which corresponds to the installation angle of the conduction carrier plate relative to the conduction area or the optical axis of the carrier device. The bond contact part may thus be formed as a wedge shape in particular. It may be formed as a metal piece, for example, and may be fastened conductively with its support surface to a contact pad of the circuit carrier, for example, by soldering or gluing with the aid of a conductive adhesive.
A parallel alignment may thus be achieved in turn by relatively simple means, so that the first contact pad of the carrier device may be formed on a lower edge, for example, an edge situated at a right angle.
This embodiment thus also makes it possible to establish a secure connection and contact inexpensively. Only the corresponding bond contact parts are to be applied, for example, as inexpensive angle brackets.
A camera module 1 is provided for mounting in or on a vehicle 2, for example, on a vehicle window 3, a roof liner or a rearview mirror on vehicle 2, for example. Camera module 1 has a lens system 4, a carrier device 6 and an image sensor 7 mounted on carrier device 6. Carrier device 6 has a three-dimensional injection-molded shape, in particular as an MID (molded interconnect device) component having a three-dimensional contouring and conductor tracks 8 on its surface. Image signals S1 of image sensor 7 are read out via conductor tracks 8.
In addition, a circuit board 10, as a planar circuit carrier, including electronic components 11, 12 and a camera housing 14, designed here in two parts, including housing parts 14a and 14b are provided, carrier device 6 and circuit board 10 being accommodated in housing interior 15. Electronic components 11, 12 are also used in particular record, process and output image signals S1 of image sensor 7. They may constitute a microcontroller 11 and a memory 12, for example, if necessary, also an interface for connection to a data network in vehicle 2.
In the specific embodiment shown here, image sensor 7 is mounted using flip-chip technology, i.e., carrier device 6 has a recess 16 through which image sensor 7 is directed at lens system 4. Image sensor 7 may therefore be mounted and contacted directly via solder bumps on MID carrier device 6, for example. Fundamentally, however, other mounting variants are also possible here. Camera module 1 is advantageously manufactured in a fixed-focus design, i.e., having a fixed focal distance and object distance, by affixing lens system 4 during its manufacture to carrier device 6 in a suitable position by adhesive bonding, friction welding or additional locking means, for example, after focusing, for example, by detecting a test pattern under evaluation of image signals S1 of image sensor 7.
MID carrier device 6 has a lens system mounting area 6c, which is designed essentially in the form of a bowl or a pot and has recess 16 in its bottom and also has a conduction area 6d extending to circuit board 10, conductor tracks 8 running on its front side 6a and/or back side 6b, contacting image sensor 7. According to
Circuit board 10 has a recess 17, into or through which lower edge 6e of MID carrier device 6 is placed. Here, circuit board 10 may basically also contact MID carrier device 6. However, these are advantageously designed without contact, i.e., without direct contact, with one another. Both MID carrier device 6 and circuit board 10 are advantageously mounted or fastened in housing 14.
Two contact pads 20 are formed on top side 10a and/or bottom side 10b of conductor surface 10, i.e., bottom side 10b here. First contact pads 18 of MID carrier device 6 are contacted with second contact pads 20 of circuit board 10 with the aid of bond connections 22.
First contact pads 18 are designed to be nonplanar. They are advantageously designed to be convex, i.e., curved outwardly, as shown in
Lower edge 6e is therefore advantageously designed with a corresponding convex shape, so that contact pads 18 are formed by metallization and structuring of areas of lower edge 6e having the curved shape.
MID carrier device 6 including mounted image sensor 7 and accommodated lens system 4 form an imager module 13, which is subsequently mounted in housing 14 and is contacted with circuit board 10.
Bond connections 22 contact first contact pads 18 in a contact area 18a, to which an applied tangent 19 or tangential plane runs in parallel to second contact pad 20. It is basically not necessary for tangent 19 according to partial image b) to lie on a level with second contact pads 20. This means that second contact pads 20 do not necessarily lie in tangential plane 19 but instead they may also be offset in parallel to one another, as shown in the alternative of partial image c) of
First contact pads 18 thus allow for a plurality of different tangential planes 19 via their longitudinal extension, i.e., in the x direction (or −x direction) in
Installation angle α is thus α=0. In
Thus, with regard to the process engineering, the contact device used, which sets bond connections 22, may be programmed accordingly, so that it selects a contact area 18a of first contact pads 18, whose tangential plane 19 runs in parallel to second contact pads 20. Thus, only a corresponding reprogramming of the contact device is necessary for setting bond connections 22 at different installation angles α of circuit board 10 with respect to circuit area 6b.
In the specific embodiment in
In the specific embodiment in
Thus, in all specific embodiments, bond connections 22 may be placed or applied between parallel contact surfaces. In all specific embodiments, the contact may take place with both bottom side 10b and top side 10a of circuit board 10.
First contact pads 18 and 118 may basically also be formed in a position other than lower edge 6e, 106e.
Number | Date | Country | Kind |
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10 2013 205 160.3 | Mar 2013 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2014/053496 | 2/24/2014 | WO | 00 |