Abstract:
The present invention prevents adverse effects on an external device due to radiation noise from a signal line, stereo camera device is provided with: a case; a first image-capturing unit provided at one end in a longitudinal direction of the case; a second image-capturing unit provided at the other end; a circuit board provided inside the case, a processing circuit connected to each of the first image-capturing unit and the second image-capturing unit by a signal line being mounted on the circuit board, and a connector for outputting a signal processed by the processing circuit to an external apparatus being disposed on the circuit board; and a partition member for partitioning the inside of the case into a plurality of spaces along the longitudinal direction at a first interval that corresponds to a frequency bandwidth in which radiation noise from the signal line is suppressed.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a stereo camera device. 
       BACKGROUND ART 
       [0002]    Conventionally, there is known a camera module having such a structure that a partition plate is provided between an imaging element and an image-processing substrate, and noise generated in the substrate is not transmitted to the imaging element (e.g., PTL 1). 
       CITATION LIST 
     Patent Literature 
       [0003]    PTL 1: JP 2005-229431 A 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0004]    However, in the case of a stereo camera in which an imaging element and an image-processing IC are connected to each other through a long signal line, there is a problem that many radiation noises are generate from the signal line due to cavity resonance. 
       Solution to Problem 
       [0005]    A stereo camera device described in claim  1 , including: a casing, a first imaging portion provided on one of ends of the casing in a longitudinal direction of the stereo camera device, a second imaging portion provided on the other end of the casing in the longitudinal direction, a substrate on which a processing circuit connected to the first imaging portion and the second imaging portion through signal lines is mounted, on which a connector for outputting a signal processed by the processing unit to an external device is placed, and which is provided, in the casing, and at least one partition for dividing an interior of the casing into a plurality of spaces in the longitudinal direction at first intervals corresponding to a frequency band which suppresses radiation noise from the signal lines. 
       Advantageous Effect of Invention 
       [0006]    According to the present invention, since a partition is provided, to divide the interior of the casing at the first intervals which correspond to frequency of the radiation noise from the signal line, it is possible to prevent an adverse influence from being exerted on an external device caused by the radiation noise. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0007]      FIG. 1  is a perspective view for describing an interior structure of a stereo camera device according to a first embodiment of the present invention. 
           [0008]      FIG. 2(   a ) and  FIG. 2(   b ) are sectional views of the stereo camera device of the first embodiment. 
           [0009]      FIG. 3  is a schematic plan view of an upper surface of a substrate provided in a casing. 
           [0010]      FIG. 4  is a diagram for describing cavity resonance in a space divided in the casing. 
           [0011]      FIG. 5(   a ) and  FIG. 5(   b ) are sectional views of a stereo camera device according to a second embodiment. 
           [0012]      FIG. 6  is a perspective view for describing an interior structure of a stereo camera device according to a third embodiment. 
           [0013]      FIG. 7  is a sectional view of a stereo camera device according to a modification. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
       [0014]    A first embodiment of a stereo camera device according to the present invention will be described with reference to the drawings. In this description, the stereo camera device which is provided in a vehicle such as a passenger vehicle and which is an externality recognizing sensor used as one of in-vehicle safety devices is described as one example. The stereo camera device measures a distance to an object utilizing a principle of triangulation using images acquired by two imaging portions provided such that the imaging portions are laterally separated from each other by a reference length (e.g., about 200 mm to 400 mm).  FIG. 1  is a transmissive schematic perspective view of an interior structure of the stereo camera device according to the first embodiment. The present invention will be described below based on the assumption that a coordinate system composed of an x axis, a y axis and a z axis is set as shown in the drawings. 
         [0015]    The stereo camera device  10  includes a metal casing  100 , a first imaging portion  101 , a second imaging portion  102 , a substrate  103 , partition plates  104   a ,  104   b ,  104   c  and  104   d  (when they are collectively called, reference sign  104  is assigned), an image processing IC  108 , a microcomputer  109 , a connector  110  and signal lines  111  and  112 . The casing  100  has such a cylindrical shape that its long side (longitudinal direction) extends in an x-axis direction. While a cross section shape of the casing  100  at a plane intersecting with the x axis at right angles is rectangular in the example shown in  FIG. 1 , the cross section shape is determined in associated with an installation place of the stereo camera device  10 , and a circular cross section shape or an elliptic cross section shape are also included in one embodiment of the present invention. 
         [0016]    The first imaging portion  101  is formed by mounting an imaging element and an optical lens (both not shown), and the first imaging portion  101  is placed on one of ends (−side of x-axis in  FIG. 1 ) of the casing  100 . The second imaging portion  102  is formed by mounting an imaging element and an optical lens (both not shown), and the first imaging portion  101  is placed on the other end (+side of x-axis in  FIG. 1 ) of the casing  100 . That is, the first imaging portion  101  and the second imaging portion  102  are placed in the casing  100  such that the imaging portions  101  and  102  are separated from each other by a reference length L 0  along the x axis which is the longitudinal direction. The first imaging portion  101  and the second imaging portion  102  shoot (take a picture of) a photogenic subject on the y-axis +side, and output, to a later-described image processing IC  1 . 08 , an analogue image signal produced by photoelectric conversion. The first imaging portion  101  and the second imaging portion  102  configuring the stereo camera device  10  are controlled such that image control and sending and receiving operations of signals are carried out substantially at the same time. 
         [0017]    The substrate  103  extends in the x-axis direction, i.e., the longitudinal direction of the casing  100 , and the substrate  103  is placed in the casing  100  by sandwiching the substrate  103  from the +side of z-axis by the partition plates  104   a  and  104   c  and from the −side of z-axis by the partition plates  104   b  and  104   d . A −side end of x-axis and a +side end of x-axis of the substrate  103  are connected to each other through the first imaging portion  101  and the second imaging portion  102 , a cable or a connector. The image processing IC  108 , the microcomputer  109 , the connector  110 , the signal lines  111  and  112  and various IC (not shown) are provided on the substrate  103 . A circuit GND pattern (wire) or a frame GND pattern (wire) are provided in the y-axis direction at a position where the pattern is connected to the later-described partition plate  104 . 
         [0018]    The image processing IC  108  is connected to the first imaging portion  101  through the signal line  111  and connected to the second imaging portion  102  through the signal line  112 . The image processing IC  108  sends and receives various control signals and analog image signals between the first imaging portion  101  and the second imaging portion  102 , converts the received image signal into a digital signal, and calculates a distance to the shot object and a size of the object. The microcomputer  109  is a control circuit which controls the image processing IC  108 . The connector  110  supplies power source to various ICs provided on the substrate  103 , and outputs a shot image and the like processed by the image processing IC  108  to an in-vehicle external device such as a car radio and a navigation system. The signal lines  111  and  112  are places using ends on the substrate  103  as paths such that the signal lines  111  and  112  can avoid the various ICs and wires provided on the substrate  103 . While  FIG. 1  shows the example that the image processing IC  108  and the microcomputer  109  are placed in the vicinity of a central portion of the substrate  103 , the places where the image processing IC  108  and the microcomputer  109  are placed are not limited to the example shown in  FIG. 1 . 
         [0019]    The partition plates  104  are metal plate members provided to prevent, radiation noise from the signal lines  111  and  112  from being transmitted to the external device through the connector  110  and from exerting adverse influence. The partition plates  104   a  and  104   c  are mounted on an upper surface  100 U of the casing  100  through a screw or weld. The partition plates  104   b  and  104   d  are mounted on a bottom surface  100 B of the casing  100  through a screw or weld. Across section of each of the partition plates  104  at a plane which is parallel to a yz-plane is formed into a rectangular shape such that an interior of the casing  100  is divided into a plurality of spaces in the x-axis direction. A length L of each of the plurality of spaces divided by the partition plates  104  in the x-axis direction, i.e., an interval between the partition prates  104   a  and  104   c , an interval between the partition plates  104   b  and  104   d , an interval between the side surface  100 L of the casing  100  and the partition plates  104   a  and  104   b , and an interval between a side surface  100 R of the casing  100  and the partition plates  104   c  and  104   d  are determined in accordance with a frequency band which suppresses radiation noise from the signal lines  111  and  112 . Details of the length L will be described later. Thicknesses of the partition plates  104  are determined such that strength against vibration is secured. The partition plates  104  may integrally be formed together with the casing  100 . 
         [0020]    Connection between the substrate  103  and the partition plates  104  will, be described using a sectional view of the casing  100  shown in  FIG. 2 .  FIG. 2(   a ) is a sectional view of the casing  100  in an xz-plane, and  FIG. 2(   b ) is a sectional view of the casing  100  in a yz-plane. While the following description is made centering on the partition plates  104   a  and  104   b , the partition plates  104   c  and  104   d  also have, the same configurations. 
         [0021]    As shown in  FIG. 2(   a ), the partition plate  104   a  is connected to a circuit GND pattern or a frame GND pattern (collectively called ground pattern, hereinafter)  550  provided on an upper surface of the substrate  103  through the ground member  501  made of resilient material, such as a spring. A partition plate  104   b  is connected to a ground pattern  551  provided on a lower surface of the substrate  103  through the ground member  502  made of radiation noise such as a spring. In this embodiment, the partition plates  104   a  and  104   b  and the ground members  501  and  502  are integrally formed respectively. 
         [0022]    As shown in  FIG. 2(   b ), the plurality of ground members  501  and  502  are provided at predetermined intervals a in a y-axis direction, i.e., a short direction of the casing  100 . That is, the partition plates  104   a  and  104   b  are connected to the substrate  103  in a separated manner at the predetermined intervals a in the y-axis direction. Hence, spaces exist between the substrate  103  and the partition plates  104   a  and  104   b  By setting the predetermined interval a as will be described later, the space between the substrate  103  and the partition plate  104  function as a waveguide, and the waveguide prevents radiation noise of predetermined frequency or less generated from the signal lines  111  and  112  from being transmitted to the external device through the connector  110  and from exerting adverse influence. 
         [0023]    As shown in  FIG. 2(   a ) and  FIG. 2(   b ), the ground member  501  of the partition plate  104   a  and the ground member  502  of the partition plate  104   b  are provided substantially on the same straight line in the z-axis direction. Hence, it is possible to enhance a hidden degree of the spaces divided by the partition plates  104   a  and  104   b  in the x-axis direction. Further, the substrate  103  sandwiched between the partition plates  104   a  and  104   b  is sandwiched from the +side and −side of z-axis substantially by the same forces through the ground members  501  and  502  made of resilient material, and it is possible to prevent the substrate  103  from bending. 
         [0024]    Radiation noise from the signal lines  111  and  112  will be described below.  FIG. 3  is a schematic plan view of the upper surface of the substrate  103  when the interior of the casing  100  is viewed from the +direction of z-axis. As described above, the signal lines  111  and  112  are provided as paths using ends on the substrate  103  such that the signal lines  111  and  112  avoid she various ICs and the wires provided on the substrate  103 . Generally, since the ends of the substrate  103  do not easily take return pass of the GND pattern, noise is prone to be radiated from the signal lines  111  and  112 . 
         [0025]    The signal lines  111  and  112  connect, to each other, the image processing IC  108  provided in the vicinity of a central portion of the upper surface of the substrate  103  and the first imaging portion  101  on the +side of the x-axis and the second imaging portion  102  on the −side of x-axis. Hence, as shown in  FIG. 3 , wiring paths of the signal lines  111  and  112  have shapes of dipole antenna as described above. To make the first imaging portion  101  and the second imaging portion  102  operate in synchronization with each other, signals are transmitted to the signal lines  111  and  112  substantially at the same time. As a result, the signal lines  111  and  112  function as dipole antenna, and noise is prone to be generated. 
         [0026]    Noises generated by the signal lines  111  and  112  occur resonance phenomenon in the space of the cylindrical, casing  100  having the long side in the x-axis direction, and become noises (radiation noises) having high frequency (resonance frequency) When this radiation noise is transmitted to the connector  110  and is discharged to the outside of the stereo camera device  10  or the radiation noise leaks to outside from a gap of the casing  100 , the radiation noise exerts adverse influence on the operation of the in-vehicle external device depending upon frequency of the radiation noise. 
         [0027]    In this embodiment, by dividing the space in the casing  100  using the partition plates  104 , the frequency of the radiation noise is brought into cavity resonance frequency f 1  of a frequency band which is higher than a frequency band having the possibility of adverse influence exerted on the operation of the external device, and influence on the operation of the external device, is lowered. In other words, the length L of the space divided in the casing  100  in the x-axis direction is determined such that frequency becomes the cavity resonance frequency f 1  which does no exert adverse influence on the operation of the external device. 
         [0028]    The cavity resonance frequency f 1  is indicated by the following equation (1). 
         [0000]        f 1=1.50{(1/ L ) 2 +( m/M ) 2 +( n/N ) 2 } 1/2  [MHz]  (1)
 
         [0029]    wherein L, M and N are lengths of the divided spaces in the x axis, the y axis and the z axis. Further, l, m and n shows the number of half wavelengths in the spaces divided in the casing  100 . 
         [0030]    Since, the casing  100  is of the structure having the long side extending along the x-axis, the length in the x-axis direction is predominant. Hence, the cavity resonance frequency f 1  can be expressed by the following equation (2) which is similar to the equation (1). As shown in equation (2), the smaller the length L of the divided space becomes, the higher the cavity resonance frequency f1 becomes. 
         [0000]      f1≈150×(1/L) [MHz]  (2)
 
         [0031]    A waveform W 1  shown by a solid line in  FIG. 4  shows one half wavelength forming one node in the space. In this case, l=1, m=0 and n=0. Waveforms W 2  shown by a broken line show three half wavelengths forming three nodes in the space. In this case, l=3, m=0 and n=0. As shown in  FIG. 2 , the greater the number of half wavelengths increases, the higher the cavity resonance frequency f 1  becomes. That is, the greater the number of half wavelength, becomes, the higher the cavity resonance frequency f 1  becomes. The number of half wavelengths is determined in accordance with a vehicle installation when the stereo camera device  10  is installed. The following description is based on such an example that when the cavity resonance frequency f 1  is set to a high frequency band, the number of half wavelength having the severest condition is set to one, i.e., l=1. 
         [0032]    As a frequency band having the possibility of adverse influence exerted on the operation of the external device is taken into consideration, the cavity resonance frequency f 1  of radiation noise is set to not less than certain frequency (e.g., about 3 [GHz]) which is higher than the highest frequency of a noise spec of each of the external devices. In this case, by inversely calculating equation (2) while setting l to one, the length L of the divided space in the x-axis direction is set to 5 [cm] or less. That is the partition plates  104   a ,  104   b ,  104   c  and  104   d  are provided in the casing  100  such that the interval between the partition plates  104   a  and  104   c  in the x-axis, the interval between the partition plates  104   b  and  104   d  in the x-axis, the interval between the side surface  100 L of the casing  100  and the partition plates  104   a  and  104   b  in the x-axis direction, and the interval between a side surface  100 R of the casing  100  and the partition plates  104   c  and  104   d  in the x-axis direction shown in  FIG. 2  become 5 [cm] or less. However, it is preferable that the lower limit of the interval in the x-axis be determined while taking into consideration, costs of the partition plates  104 , installation of the various ICs and parts on the substrate  103  and difficulties of pattern design. 
         [0033]    By determining the length L of the space as described above, the cavity resonance frequency f 1  becomes a frequency band higher than a frequency band which exerts adverse influence on the external device. Hence, even if radiation noise which becomes the cavity resonance frequency f 1  is discharged outside of the stereo camera device  10  through the connector  110  or the radiation noise leaks to outside from the gap of the casing  100 , adverse influence is not exerted on the operation of the external device. 
         [0034]    The above description is based on the example that the interior of the casing  100  is divided into the three spaces by the partition plates  104 . However, the number of divided spaces, i.e., the number of the partition plates  104  provided in the casing  100  differs depending upon radiation noises from the signal lines  111  and  112  and the length of the casing  100  in the x-axis direction. 
         [0035]    The partition plates  104  are connected to the substrate  103  at the predetermined interval a in the y-axis such that the partition plates are separated from the substrate  103  as described above. According to this, the spaces existing between the partition plates  104  and the substrate  103  in the z-axis direction function as waveguides. In this case, frequency f 2  of radiation noise which is cut off by the spaces existing between the partition plates  104  and the substrate  103  (cutoff frequency f 2 , hereinafter) is shown by the following equation (3). 
         [0000]        f 2= c/ 2 a    (3)
 
         [0036]    wherein c is speed of light. 
         [0037]    The cutoff frequency f 2  is a frequency band having nothing to do with the operation of the stereo camera device  10 . The cutoff frequency f 2  is set to a frequency component which does not reach the cavity resonance frequency f 1  by the partition plates  101  and especially, the cutoff frequency f 2  is set to a frequency band having the possibility of adverse influence exerted on the external device. That is, it is preferable that the cutoff frequency f 2  be set to a value smaller than the cavity resonance frequency f 1 . 
         [0038]    The predetermined interval a is determined based on the equation (3) so that such cutoff frequency f 2  is obtained. That is, the predetermined interval a is determined such that radiation noise from the signal lines  111  and  112  which is equal to or less than the cutoff frequency f 2  is cut off, and the radiation noise which is equal to or less than the cutoff frequency f 2  is prevented from passing from the spaces. As a result, radiation noise from the signal lines  111  and  112  includes a frequency band exerting adverse influence on the external device is cut off. This configuration prevents radiation noise from the signal lines  111  and  112  from being transmitted to the external device through the connector  110  and from exerting di. 
         [0039]    The example shown in  FIG. 2(   b ) shows a case where five ground members  501  and  502  are provided respectively. However, the number of ground members  501  and  502  is determined in associated with the predetermined interval a, and it is preferable that at least one pair of ground members  501  and  502  be provided respectively. 
         [0040]    According to the stereo camera device of the first embodiment, the following function effects are obtained. 
         [0041]    (1) The stereo camera device includes the partition plates  104  dividing the interior of the cylindrical casing  100  into the plurality of spaces in the longitudinal direction at an interval corresponding to a frequency band suppressing radiation noise from the signal lines  111  and  112  which connect, to each other, the first imaging portion  101 , the second imaging portion  102  provided on both ends in the longitudinal direction and the image processing IC  108 . This interval is determined such that the cavity resonance frequency f 1  of a frequency band becomes higher than a frequency band of noise radiated from the signal lines  111  and  112 . As a result, even if radiation noise is transmitted to the connector  110  or the radiation noise is discharged outside of the stereo camera device  10  through a harness of the radiation noise leaks to outside from the gap of the casing  100 , it is possible to prevent the radiation noise from exerting adverse influence on the operation of the in-vehicle external device. Generally, as frequency of electromagnetic wave is higher, the electromagnetic wave is more prone to be attenuated. Therefore, it is possible to contribute to attenuation of radiation noise by bringing the cavity resonance frequency f 1  into a high frequency band. Further, as compared with a countermeasure example in which radio wave absorbent sheets are pasted on the casing  100  and the image processing IC  108  or a gasket is provided in the gap of the casing  100 , since it is possible to prevent influence of radiation noise from exerting from exerting on the external device with a simple structure, this configuration also contributes to reduction of costs. 
         [0042]    (2) The partition plates  104   a  and  104   c  provided on an inner wall of the upper surface  100 U of the casing  100  are connected to each other through the ground pattern  550  and the ground member  501  provided on the upper surface of the substrate  103 , and the partition plates  104   b  and  104   d  provided on an inner wall of the bottom surface  100 B of the casing  100  are connected to each other through the ground pattern  551  and the ground member  502  provided on the lower surface of the substrate  103 . Hence, since the casing  100  and the circuit GND pattern or the frame GND pattern of the substrate  103  can be connected to each other, it is possible to lower the impedance of GND, and to obtain a noise reduction effect on the substrate  103 . 
         [0043]    (3) The partition plates  104   a  and  104   c  are connected to each other through the ground pattern  550  on the upper surface of the substrate  103  and the ground member  501  made of resilient material, and the partition plates  104   b  and  104   d  are connected to each other through the ground pattern  551  on the lower surface of the substrate  103  and the ground member  502  made of resilient material. Hence, since substantially the same forces are applied to the substrate  103  from the +side and −side of z-axis, it is possible to prevent inconvenience that the substrate  103  bends. 
         [0044]    (4) Each of the lengths L, in the x-axis direction, of the spaces divided by the partition plates  104  is set as a distance which cavity-resonates noise generated by the signal lines  111  and  112 , and which brings the frequency of the noise into a frequency band higher than a noise frequency band that is prescribed by the external device. As a result, since the resonance frequency f 1  of radiation noise becomes higher than a frequency band which exerts adverse influence on the external device, even if the radiation noise is discharged outside of the stereo camera device  10  through the connector  110  or the radiation noise leaks to outside from the gap of the casing  100 , adverse influence is not exerted on the operation of the in-vehicle external device. 
         [0045]    (5) The ground members  501  and  502  are connected to each other along the y-axis at predetermined interval a which correspond to radiation noise from the signal lines  111  and  112 . In this case, the predetermined interval a is set such that radiation noise having the cutoff frequency f 2  which is smaller than the cavity resonance frequency f 1  can be cut off. As a result, it is possible to prevent radiation noise having frequency which is equal to or less than the cutoff frequency f 2  having the possibility that adverse influence is exerted on the external device from passing through the space existing in the z-axis direction between the partition plates  104  and the substrate  103 . Therefore, it is possible to prevent the radiation noise from the signal lines  111  and  112  from being transmitted to the external device through the connector  110  and from exerting adverse influence on the external device. 
       Second Embodiment 
       [0046]    A second embodiment of the stereo camera device according to the present invention will be described with reference to drawings. In the following description, the same reference signs are allocated to the same constituent element as those of the first embodiment, and differences will mainly be described. Points which are not especially described are the same as the first embodiment. In the first embodiment, the ground member which is integrally formed together with the partition plate, and the partition plate and the substrate are connected to each other. The second embodiment is different from the first embodiment in that a ground member and a partition on plate soldered to a substrate are connected to each other. 
         [0047]      FIG. 5(   a ) and  FIG. 5(   b ) are sectional views of a casing  100  of a stereo camera device  10  in the second embodiment.  FIG. 5(   a ) is a sectional view in an xy-plane of the casing  100 , and  FIG. 5(   b ) is a sectional view in a yz-plane of the casing  100 . While the following description is made centering on partition plates  104   a  and  104   b , partition plates  104   c  and  104   d  also have the same configurations. 
         [0048]    As shown in  FIG. 5(   a ) and  FIG. 5(   b ), a lower end (−side of z-axis) of each of the ground members  501  made of resilient material such as a spring is soldered to a ground pattern  550  such as a circuit GND pattern and a frame GND pattern provided on an upper surface of a substrate  103 . An upper end (+side of z-axis) of the ground member  501  is connected to a lower end of a partition plate  104   a . An upper end (aside of z-axis) of the ground member  502  made of resilient material such as a spring is soldered to a ground pattern  551  provided on a lower surface of the substrate  103 . A lower end (−side of z-axis) of the ground member  502  is connected to an upper end of the partition plate  104   b.    
         [0049]    The ground members  501  of the partition plates  104   a  and the ground members  502  of the partition plate  104   b  are the same as the stereo camera device  10  of the first embodiment in that the ground member  501  and the ground member  502  are provided substantially on the same straight line in the z-axis direction, and in that the ground members  501  and the ground members  502  are provided at predetermined interval a in the y-axis direction. According to the stereo camera device  10  of the second embodiment having the above-described connecting manner also, the same function effects as the stereo camera device of the first embodiment can be obtained. 
       Third Embodiment 
       [0050]    A third embodiment of the stereo camera device according to the present invention will be described with reference to a drawing. In the following description, the same reference signs are allocated to the same constituent elements as those of the first embodiment, and differences will mainly be described. Points which are not especially described are the same as the first embodiment. In the third embodiment, a shape of a partition plate is different from that of the partition plate of the first embodiment in which the partition plate is formed into a rectangular plane which is parallel to a yz-plane 
         [0051]      FIG. 6  is a perspective view for describing, in a transmissive mariner, an interior structure of the stereo camera device  10  according to the third embodiment. As shown in  FIG. 6 , partition plates  801  to  804  are formed such that cross sections thereof are formed into arc shapes at planes which are parallel, to an xy-plane. Even when the partition pates  801  to  804  have the shapes shown in  FIG. 6 , an interior of the casing  100  is divided into a plurality of spaces by the partition plates  801  to  804  and a wall surface of the casing  100 . In this embodiment, inner diameters of the arc-shaped partition plates  801  to  804  and distances of partition plates which are adjacent to each other in the x-axis direction are determined based on the above-described equation (2). As a result, in the spaces divided by the partition plates  801  to  804 , noise generated by signal lines  111  and  112  becomes radiation noise having cavity resonance frequency f 1  by the resonance phenomenon. The partition plates  801  to  804  and the substrate  103  are connected to each other in the same manner as the first embodiment or the second embodiment. According to the stereo camera device  10  of the third embodiment having the above-described connecting manner also, the same function effects as the stereo camera device of the first embodiment can be obtained. 
         [0052]    Shapes of cross sections of the partition plates  801  to  804  which are parallel to the xy-plane are not limited to the arc shapes, and as the cross sections, various shapes such as triangular shapes and stair shapes are included. It is preferable that the cross section shape can avoid installation positions of the various ICs provided on the substrate  103 . 
         [0053]    The following modifications are also within the scope of the present invention, and one of the modifications may be used alone or a plurality of modifications may be combined with the above-described embodiments. 
         [0054]    (1) Instead of the structure in which the partition plates  104  are provided on an inner will of the upper surface  100 U of the casing  100  and an inner wall of the bottom surface  100 B and the substrate  103  is sandwiched between the +side of z-axis and the −side of z-axis, it is also possible to employ a structure that the partition plates  104  are provided on one of the inner wall of the upper surface  100 U of the casing  100  and die inner wall of the bottom surface  100 B. For example, when a mounted product is not provided on the lower surface of the substrate  103 , the substrate  103  may be fixed to the inner wall of the bottom surface  100 B of the casing  100  through a screw of the like, and the lower end of the partition plates  104  provided on the inner wall of the upper surface  100 U of the casing  100  and the upper surface of the substrate  103  may be connected to each other as shown in  FIG. 7 . 
         [0055]    (2) Instead of the structure that the partition plate  104  and the ground patterns  550  and  551  provided on the substrate  103  are connected to each other through, the ground members  501  and  502 , the partition plate and the ground patterns  550  and  551  of the substrate  103  may directly be connected to each other. In this case, it is preferable that the end of the partition plate on the side of the substrate  103  be processed into such a shape that a space of the predetermined interval a is formed. 
         [0056]    (3) The stereo camera device  10  is not limited to the in-vehicle stereo camera provided in a vehicle, and the stereo camera device  10  may be used in a stereo camera provided in a moving body such as a construction machine and a railroad vehicle, and an industrial robot. 
         [0057]    The present invention is not limited to the above-described embodiments unless the feature of the invention are not damaged, and other modes which are considered within a scope of technical idea of the invention is also included in the scope of the invention. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           10  stereo camera device 
           100  casing 
           101  first imaging portion 
           102  second imaging portion 
           103  substrate 
           104 ,  801 ,  802 ,  803 ,  804  partition plate 
           108  image processing IC 
           109  microcomputer 
           110  connector 
           111 ,  112  signal lines 
           501 ,  502  ground member 
           550 ,  551  ground pattern