JP5862225B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging device used as a digital camera, a digital video camera, a toy camera, and the like, and more particularly to an imaging device suitable for an in-vehicle camera and a surveillance camera.

  2. Description of the Related Art Conventionally, an imaging apparatus having an electronic circuit unit including an imaging element for obtaining a subject image formed by an imaging optical system having an optical element such as an imaging lens is known. In such an imaging apparatus, the imaging optical system and the electronic circuit unit are accommodated in a casing made of an insulator, and a conductive portion is provided on the outer peripheral surface of the casing, and the conductive portion is used as a reference potential of the electronic circuit unit. Alternatively, it is conceivable to connect to the ground level (for example, see Patent Document 1). With this imaging device, it is possible to prevent the static electricity of the human body from entering the electronic circuit unit (its electric circuit), and to prevent the malfunction of the electronic circuit unit caused by the static electricity and its adverse effects on the electronic components, etc. Can do.

Here, as described above, the imaging apparatus having the imaging optical system and the electronic circuit unit is widely applied as, for example, an in-vehicle camera that assists the driver's visual recognition in a vehicle, a surveillance camera mounted on an ATM (Automated Teller Machine), or the like. Therefore, it is required to ensure performance. In such an imaging device, since it is installed outdoors, in addition to countermeasures against static electricity due to the conductive part of the conventional imaging device, sealing measures to prevent entry of foreign matter into the inside of the housing, and imaging optical system Antifouling measures are required to prevent the surface of the lens (hereinafter also referred to as the first lens) that is closest to the subject from becoming dirty. As a sealing measure, the first lens has a configuration in which the housing (housing member) that houses the imaging optical system and the electronic circuit unit has an opening that exposes the surface of the first lens and the other portion is sealed. A sealing member made of an elastic member such as rubber is interposed between the opening of the housing and the housing. Further, as an antifouling measure, for example, silica (SiO ₂ ) is coated on the surface of the first lens (forms an antifouling film) to make it difficult to attach water, dust, and the like. .

  However, even if the surface is coated (an antifouling film is formed) as described above, there is a possibility that minute dust may adhere to the surface of the first lens due to static electricity. Even if such dust is minute, it may cause deterioration of the obtained image, and therefore it is desirable to reduce adhesion.

  The present invention has been made in view of the above circumstances, and an imaging apparatus capable of suppressing dust from adhering to the surface of the first lens in the imaging optical system housed in a housing member made of an insulator. The purpose is to provide.

The imaging apparatus according to claim 1, an electronic circuit unit including an imaging element for obtaining a subject image formed by the imaging optical system, and a surface of a first lens arranged on the subject side in the imaging optical system An imaging device comprising: an imaging optical system and a housing member that houses the electronic circuit unit while exposing the light, wherein the first lens is configured to prevent light from entering from outside the effective diameter of the first lens . the said surface of the lens is provided in contact with the back surface opposite, provided with a light shielding member having conductivity, the first lens is connected to a circuit reference potential position in the electronic circuit unit through said light blocking member and wherein the Tei Rukoto.

  In the imaging device according to the first aspect, it is possible to suppress the dust from adhering to the surface of the first lens in the imaging optical system housed in the housing member made of an insulator.

FIG. 3 is an explanatory diagram viewed from the front side for explaining a schematic configuration of the imaging apparatus 10. FIG. 2 is an explanatory diagram viewed from the rear side for explaining a schematic configuration of the imaging apparatus 10. It is typical sectional drawing of the imaging device 10 obtained along the II line | wire of FIG. It is explanatory drawing shown with a typical cross section in order to demonstrate the structure of the connection cord. It is explanatory drawing for demonstrating the back vision assistance mechanism 80 comprised using the imaging device 10 which concerns on this invention as a vehicle-mounted camera. It is explanatory drawing for demonstrating a mode that adhesion of the dust to the surface of the lens 21a in the imaging device 10 is suppressed, (a) shows the case where the back surface of the lens 21a is not connected to a reference potential or a ground level. (B) shows the case where the back surface of the lens 21a is connected to a reference potential or a ground level.

  Embodiments of an imaging device according to the present invention will be described below with reference to the drawings.

  First, a schematic configuration of the imaging apparatus 10 according to the present invention will be described with reference to FIGS. The imaging device 10 is generally configured by housing an imaging optical system 20 and an electronic circuit unit 30 inside a housing 11. Hereinafter, when viewed in the direction along the imaging optical axis OA of the imaging optical system 20, the side from the imaging device 10 toward the subject (the direction indicated by the arrow OA) is referred to as the front, and the opposite side is referred to as the rear. Further, a direction passing through the photographing optical axis OA and orthogonal to the photographing optical axis OA (radiation direction from the photographing optical axis OA) is referred to as a radial direction.

  In this embodiment, the housing 11 includes a front case 12 that supports the imaging optical system 20 and a rear case 13 that houses the electronic circuit unit 30. The front case 12 constitutes a front portion (front housing portion) of the housing 11, and photographing of an objective lens (a lens 21a to be described later in this example) of the imaging optical system 20 is performed on the front surface (one end side). An outer surface S surrounding the periphery viewed in a direction (radial direction) orthogonal to the optical axis OA is formed. The front case 12 is formed of an insulator, and in the present embodiment, is formed of plastic (synthetic resin).

  As shown in FIG. 3, the front case 12 has a holding hole 12a for accommodating the imaging optical system 20 and a sealing surrounding the photographing optical axis OA at the front side enlarged diameter portion (large inner diameter portion 12d described later). An annular groove 12b for use and a mounting groove 12c surrounding the holding hole 12a on the front end surface (outer surface S) are provided. The holding hole 12a is a stepped cylindrical through-hole having the photographing optical axis OA as an axis, and can hold an optical element group 21 (to be described later) of the imaging optical system 20 at an appropriate position and posture. Yes. The holding hole 12a has a large inner diameter portion 12d capable of receiving a lens 21a as an optical element group 21 described later from the front side (subject side), and an inner diameter that is adjacent to the large inner diameter portion 12d and smaller than the large inner diameter portion 12d. It has a portion 12e and a small inner diameter portion 12f adjacent to the portion 12e and having a smaller inner diameter than the middle inner diameter portion 12e. In the holding hole 12a, an orthogonal surface 12g orthogonal to the direction of the photographing optical axis OA is formed due to the difference in diameter between the large inner diameter portion 12d and the middle inner diameter portion 12e.

  The orthogonal surface 12g is provided with the sealing annular groove 12b described above. The sealing annular groove 12b is a recess for arranging a sealing member 25 described later, and has an annular shape surrounding the inner diameter part 12e. The mounting groove 12c surrounding the holding hole 12a (large inner diameter portion 12d) is provided with a screw thread on the inner peripheral surface, and can be engaged with the screw thread while receiving a rear end 24b of a retaining member 24 described later. Has been. Further, in the holding hole 12a, an optical element group 21 (its lens 21f) to be held as will be described later, on the rear side (on the imaging element 31 side described later) of the small inner diameter portion 12f, that is, on the rear end (other end) of the front case 12. An inner edge protrusion 12h is provided to prevent the dropout. The inner edge protrusion 12h has an annular shape that protrudes inward in the radial direction at the rear end of the small inner diameter portion 12f, and forms a hole having a smaller diameter than the inner diameter of the small inner diameter portion 12f. ing.

  In addition, the front case 12 is provided with four support wall portions 12i (only three are shown in FIG. 3) and a first contact groove 12j on the rear end face facing the rear case 13. . The four support wall portions 12i are paired on a line orthogonal to each other in the radial direction so as to surround the imaging optical axis OA outside the inner edge projection portion 12h as viewed in the radial direction. It will be a place to support. The first contact groove 12j is a groove provided on the rear end surface of the front case 12 so as to surround the four support wall portions 12i. The first contact groove 12j accepts a base end portion 36a of a main body sheet metal portion 36, which will be described later, It is possible to accommodate the one end portion 35a of the front sheet metal portion 35.

  The front case 12 is provided with a second contact groove 12k on the inner peripheral surface of the inner diameter portion 12e of the holding hole 12a. The second contact groove 12k opens the inner peripheral surface of the inner inner diameter portion 12e (holding hole 12a) so as to surround the photographing optical axis OA, and accommodates the other end portion 35b of the front sheet metal portion 35 described later. It is possible. In the present embodiment, the second contact grooves 12k are provided at four locations (only two are shown in FIG. 3) which are positions inside the four support wall portions 12i when viewed in the radial direction.

  The rear case 13 attached to the rear end of the front case 12 constitutes a rear portion (rear housing portion) of the housing 11. The rear case 13 is formed of an insulator, and in this embodiment, is formed of plastic (synthetic resin). The rear case 13 has an open box shape at one end, and has a back wall portion 13a that becomes the rear end side, and a cylindrical peripheral wall portion 13b that protrudes from the rear wall portion 13a toward the open end side. The rear case 13 has a size (depth dimension) in which the electronic circuit unit 30 can be inserted from the open end and can accommodate the electronic circuit unit 30 attached to the front case 12. ing. For this reason, in the rear case 13, the direction of the photographing optical axis OA is the insertion direction of the electronic circuit unit 30. As shown in FIGS. 2 and 3, the rear case 13 is provided with two mounting projections 13 c for mounting the housing 11, that is, the imaging device 10 on a desired location, on the outer wall surface of the back wall portion 13 a. Yes. Both the mounting projections 13c are bosses provided with screw holes.

  Further, the rear case 13 is connected to supply electric power to an electronic circuit unit 30 (an electronic circuit described later) or to transmit image data acquired by an image sensor 31 described later of the electronic circuit unit 30. A cord 14 is provided. The connection cord 14 can be connected to the electronic circuit unit 30 in a state of having sealing performance with the outside with respect to the rear case 13. For this reason, the connection cord 14 functions as a connection portion that connects the electronic circuit unit 30 to the outside of the housing 11. In the present embodiment, the connecting cord 14 is provided with a connector portion 14a at one end on the rear case 13 side, and this connector portion 14a interposes an O-ring 14b as a sealing member and is not shown in the figure. The member is fixed to the rear end face of the rear case 13. In addition, as a configuration having sealing performance, a connection hole (not shown) is provided in the rear case 13, a connection cord 14 is inserted therein, and the periphery is filled with a waterproof adhesive, or the connection cord 14 (The covering member) may be formed integrally with the rear case 13.

  As shown in FIG. 4, the connection cord 14 includes a signal line 14c, a power line 14d, and a ground line 14e. The signal line 14c is an electric wire for transmitting the image data output from the electronic circuit unit 30 to an external device. The power line 14 d is an electric wire for supplying electric power to an electronic circuit constituted by a first substrate 32 and a second substrate 33 described later of the electronic circuit unit 30. The ground wire 14e is an electric wire that is electrically connected to an external reference potential or a ground level in an external device.

  The rear case 13 having such a configuration has a front end face attached to the rear end face of the front case 12 with a sealing member 15 formed of an O-ring made of an elastic material, flat packing, or the like interposed therebetween. By being coupled with a stopper or the like, a housing 11 having a waterproof function and a dust-proof function (hereinafter referred to as a sealing performance) at each coupling position and accommodating the imaging optical system 20 and the electronic circuit unit 30 is formed. For this reason, the housing | casing 11 functions as an accommodating member. Since this housing 11 (housing member) is formed of plastic (synthetic resin) which is an insulator, it is possible to obtain an effect of preventing electrostatic discharge and to be made of a metal material. An increase in cost can be suppressed.

  The imaging optical system 20 accommodated in the housing 11 forms an image at an arbitrary position for image acquisition, and has at least two or more optical elements as shown in FIG. 10 (imaging optical system 20) is appropriately configured according to the optical performance required. The imaging optical system 20 is configured such that an optical element group 21 including a plurality of optical elements is accommodated in a holding hole 12 a of the front case 12 together with a spacing ring 22.

  When the optical element group 21 is assembled in the holding hole 12a, the interval ring 22 holds the distance in the photographic optical axis OA direction between the opposing surfaces of each optical element of the optical element group 21 at a predetermined value. To do. The interval ring 22 has a stepped cylindrical shape with the photographing optical axis OA as an axis, and has a size that can be inserted into the holding hole 12a. Further, the interval ring 22 has an inner diameter dimension that allows accommodation of a predetermined optical element in the optical element group 21. In the present embodiment, the spacing ring 22 has a size that can be inserted into the medium inner diameter portion 12e in the holding hole 12a and cannot be inserted into the small inner diameter portion 12f, and will be described later as a predetermined optical element. The inner diameter of the lens 21b and the lens 21c can be accommodated.

  In the interval ring 22, an inner edge protrusion 22 a and a diaphragm 22 b are provided on the rear side (image sensor 31 side described later), that is, on the rear end side (other end side). The inner edge protrusion 22a prevents a predetermined optical element (a lens 21c described later in this embodiment) from dropping out of the optical element group 21 inserted in the interval ring 22 (inward thereof). The diaphragm 22b defines an effective diameter (effective light beam diameter) in the optical element group 21 (imaging optical system 20).

  The spacing ring 22 is made of a conductive material, and in this embodiment is made of aluminum. In the spacing ring 22, the front end surface 22 c which is the front side (subject side), that is, the front end (one end) is equal to the orthogonal surface 12 g of the holding hole 12 a in a state where the front end surface 22 c is disposed in the inner diameter portion 12 e of the holding hole 12 a of the front case 12. It is set as the flat surface which forms a surface. That is, the interval ring 22 is set to have the same size as that of the inner diameter portion 12e of the holding hole 12a when viewed in the direction of the photographing optical axis OA. The optical element group 21 is accommodated in the holding hole 12 a of the front case 12 together with the spacing ring 22.

In this embodiment, the optical element group 21 includes a lens 21a, a lens 21b, a lens 21c, a lens 21d, a lens 21e, and a lens 21f in this order from the subject (object) side. In the present embodiment, at least the lens 21a is formed of an insulating resin material such as glass or plastic, and the surface on the object (object) side is coated with silica (SiO ₂ ) so that water, dust or the like adheres to it. Anti-fouling measures that have been made difficult are implemented. In the optical element group 21, the lens 21d, the lens 21e, and the lens 21f are accommodated in the small inner diameter portion 12f of the holding hole 12a, and the lens 21b and the lens 21c are accommodated in the spacing ring 22 in the inner inner diameter portion 12e of the holding hole 12a. The lens 21a is accommodated in the large inner diameter portion 12d of the holding hole 12a. For this reason, in the optical element group 21, a stop 22b of the spacing ring 22 is disposed between the lens 21c and the lens 21d. The interval ring 22 holds the intervals in the photographing optical axis OA direction between the opposing surfaces of the lens 21a, the lens 21b, the lens 21c, and the lens 21d at a predetermined value. In this optical element group 21, the lens 21a is the first lens (objective lens) located closest to the subject (object). The holding hole 12 a (front case 12) functions as a lens barrel that holds the optical element group 21 as the imaging optical system 20. Note that the imaging optical system 20 (the optical element group 21) may be provided with an infrared cut filter as appropriate.

  In addition, in the present embodiment, a light shielding plate 23 is provided on the rear surface which is the rear surface of the lens 21a. The light shielding plate 23 prevents light from entering from the outside of the effective diameter (effective light beam diameter) of the lens 21a in the optical element group 21 (imaging optical system 20). The light shielding plate 23 has conductivity, and in this embodiment, the light shielding plate 23 is formed by applying a conductive black paint on the surface. The light shielding plate 23 is provided in contact with the back surface of the lens 21 a and the front end surface 22 c of the spacing ring 22 that forms the orthogonal surface 12 g in the holding hole 12 a of the front case 12 and a surface equal thereto. In the following description, the optical axis in the imaging optical system 20, that is, the rotationally symmetric axis of each of the lenses 21a to 21f (including the diaphragm 22b) that is the central axis position of the optical element group 21 (holding hole 12a) will be described. The optical axis OA of the system 20, that is, the imaging apparatus 10 is assumed.

  The optical element group 21 inserted into the holding hole 12a is prevented from falling off from the opening on the large inner diameter portion 12d side by the retaining member 24. The retaining member 24 has a cylindrical shape with a size that can surround the outer peripheral surface of the lens 21a serving as an objective lens, and the front end portion 24a (end on the subject side) is the surface (front surface) of the lens 21a. It is set as the diameter dimension which can contact the peripheral part (outside position of an effective diameter) from the outside (front side). Further, the retaining member 24 is provided with a thread at the rear end 24b, and can be engaged with the thread of the mounting groove 12c of the front case 12. In the state where the optical element group 21 is appropriately inserted into the holding hole 12a together with the spacing ring 22 and the annular sealing member 25 is disposed in the sealing annular groove 12b, the retaining member 24 is formed on the rear end 24b. When the screw thread is engaged with the screw thread of the mounting groove 12c, the lens 21a is attached to the front case 12 so as to cover the lens 21a while pressing the lens 21a to the back surface side (the rear case 13 side (image surface side)). It is done. The sealing member 25 provided in the sealing annular groove 12b is made of an elastic material, and is an O-ring in this embodiment.

  Thereby, the back surface of the lens 21a is pressed against the orthogonal surface 12g of the holding hole 12a with the light shielding plate 23 interposed therebetween, and the sealing member 25 disposed between the back surface and the sealing annular groove 12b is appropriately Compressed. For this reason, in the imaging optical system 20, the sealing member 25 appropriately compressed prevents water and dust from entering the holding hole 12a from the periphery of the lens 21a, and has a sufficient sealing performance. ing. As described above, in the imaging optical system 20, the optical element group 21 (the lens 21a serving as the objective lens) is sealed in a sealed manner by the front case 12 (holding hole 12a) and has a desired optical performance. At this time, the inner diameter portion 12e and the orthogonal surface 12g in the holding hole 12a, the size dimension in the direction of the photographing optical axis OA in the interval ring 22 and the front end surface 22c are set as described above. The front end surface 22c of the spacing ring 22 is applied to the back surface of 21a with the light shielding plate 23 interposed inside the sealing member 25 when viewed in the radial direction. For this reason, the spacing ring 22 is formed in the holding hole 12a by the lens 21a fixed by the retaining member 24 and the holding hole 12a of the front case 12 (a step between the inner diameter portion 12e and the small inner diameter portion 12f). It is fixed to. An electronic circuit unit 30 (an imaging element 31 described later) is disposed at the imaging position of the optical element group 21 of the imaging optical system 20.

  The electronic circuit unit 30 includes an image sensor 31, a first substrate 32, a second substrate 33, and a shield case 34. The imaging device 31 is a solid-state imaging device configured using a CCD (Charge Coupled Device) image sensor, a CMOS (Complementary Metal Oxide Semiconductor), or the like, and passes through the imaging optical system 20 (the optical device group 21) on the light receiving surface 31a. The subject image formed on is converted into an electrical signal (image data) and output. The electrical signal output from the image sensor 31 is generated and output as digital image data corresponding to the subject image. In order to efficiently exhibit the optical performance set as the imaging optical system 20 (optical element group 21), the imaging element 31 has a substantial effect on the subject image formed by the imaging optical system 20 (optical element group 21). The position with respect to the imaging optical system 20 (holding hole 12a for holding it) is set and provided on the first substrate 32 so as to exist at an appropriate position on the light receiving surface 31a forming the light receiving region.

  The first substrate 32 has a rectangular plate shape as a whole although not clearly shown, and the image pickup device 31 is mounted on the front surface on the subject side, that is, the image pickup optical system 20 side, and a capacitor, a resistor, or the like is provided on the rear surface. An electronic component 32a is mounted. The first substrate 32 is fixed to the rear end surfaces of the four support wall portions 12i of the front case 12 through a fixing member (not shown) substantially orthogonal to the photographing optical axis OA. A connector member 32 b is provided on the rear surface of the first substrate 32. A second substrate 33 is provided on the rear side of the first substrate 32 (the rear end side of the rear case 13).

  The second substrate 33 has a rectangular plate shape as a whole although not clearly shown, and an electronic component 33a such as a capacitor and a resistor and a connector member 33b are mounted on the subject side, that is, the front surface on the imaging optical system 20 side. An electronic component 33c such as a capacitor or a resistor is mounted on the rear surface. The second substrate 33 is provided in parallel with the first substrate 32 on the rear side of the first substrate 32 (the rear end side of the rear case 13), and the connector member 33b is connected to the connector member 32b. Thus, the first substrate 32 is electrically connected. In the second substrate 33, a connector member 33d is mounted on the rear surface. The connector member 33d enables electrical connection between the connection cord 14 fixed to the rear end surface of the rear case 13 and the second substrate 33 via the connector portion 14a.

  In the first substrate 32 and the second substrate 33, predetermined electronic circuits are constituted by the electronic components 32a, 33a and 33c provided on the first substrate 32 and the second substrate 33, respectively. The electronic circuit controls the operation of the image sensor 31 and generates digital image data corresponding to the subject image based on the electrical signal output from the image sensor 31, and the digital image data is converted into a predetermined signal (for example, VGA). It is converted into a video signal corresponding to (Video Graphics Array), a video signal corresponding to NTSC (National Television System Committee) or PAL (Phase Alternating Line), and output to the connection code 14. In addition, this electronic circuit is a power supply circuit that supplies power supplied from the connection cord 14 (its power line 14d (see FIG. 4)) to drive the image pickup device 31 and the electronic components 32a, 33a, and 33c. Also works. For this reason, the electronic circuit unit 30 can output the image acquired by the image sensor 31 as a video signal. The reason why the two-layer substrates 32 and 33 are provided in this way is to reduce the size of the imaging apparatus 10 while satisfying the required performance. Therefore, the substrate for the configuration of the electronic circuit may have a structure of only one layer, or may be provided in multiple layers, taking into consideration the number, size, shape, etc. of each electronic component to be mounted. What is necessary is just to set suitably. A shield case 34 is provided so as to surround the two substrates 32 and 33 that are electrically connected in parallel in the direction of the photographing optical axis OA.

  The shield case 34 constitutes an electromagnetic shield for preventing electromagnetic waves from being emitted from the electronic circuit described above to the surroundings and the influence of electromagnetic waves from the surroundings to the electronic circuit. The shield case 34 is formed of a conductive material, and is electrically connected to the reference potential or ground level in the electronic circuit described above. The shield case 34 is made of a metal material, and is made of aluminum in this embodiment. The shield case 34 includes a front sheet metal part 35, a main body sheet metal part 36, and a rear sheet metal part 37.

  The front sheet metal part 35 constitutes a contact point of the shield case 34 to the interval ring 22. In this embodiment, the front sheet metal portion 35 has a thin plate shape made of aluminum. Four front sheet metal portions 35 are provided corresponding to the four second contact grooves 12k of the front case 12, and are embedded in the front case 12 at four locations corresponding to the respective second contact grooves 12k. Yes. Each front sheet metal portion 35 spans the first contact groove 12j and the second contact groove 12k in the radial direction, and one end portion 35a is disposed in the first contact groove 12j and the other end portion. 35b is arranged in the second contact groove 12k. The one end portion 35a is bent toward the rear side (the rear end side of the rear case 13) with respect to the radial direction in the first contact groove 12j. The other end 35b is bent forward (subject side) with respect to the radial direction in the second contact groove 12k, and the tip of the other end 35b is formed on the inner peripheral surface of the medium inner diameter portion 12e in the holding hole 12a. On the other hand, a predetermined amount projects inward in the radial direction. The predetermined amount means that it is possible to make contact with the spacing ring 22 arranged in the inner diameter portion 12e while preventing the arrangement of the spacing ring 22 on the inner diameter portion 12e.

  The main body sheet metal portion 36 is formed by bending a thin plate-like member made of aluminum and has a cylindrical shape whose cross section viewed in a direction orthogonal to the photographing optical axis OA is substantially rectangular although not clearly illustrated. ing. The main body sheet metal portion 36 has a shape and size that can be fitted into the peripheral wall portion 13b of the rear case 13 while allowing the electronic circuit unit 30 to be surrounded in a direction surrounding the photographing optical axis OA. ing. For this reason, the main body sheet metal part 36 forms an outer peripheral surface parallel to the photographing optical axis OA in the electronic circuit unit 30. The main body sheet metal part 36 is inserted into the first contact groove 12j while the base end part 36a surrounds four support wall parts 12i (only three are shown in FIG. 3) of the front case 12. Attached to the front case 12. At this time, the base end portion 36a can contact the one end portion 35a of the front sheet metal portion 35 in the first contact groove 12j. Although not shown in the figure, the main body sheet metal part 36 is provided with a support part for receiving a protrusion part that protrudes in the radial direction in the second substrate 33, and is provided with the second substrate 33 accommodated inward. It can be fixed. Further, although not shown, the main body sheet metal portion 36 is electrically connected to a circuit reference potential in a predetermined electronic circuit formed by each electronic component of the second substrate 33 accommodated inside. In the present embodiment, the main body sheet metal part 36 is electrically connected to a connection line (not shown) to the circuit reference potential of the electronic circuit provided on the second substrate 33.

  The rear sheet metal portion 37 is formed after a thin plate member made of aluminum is bent. The rear sheet metal portion 37 has a substantially rectangular shape when viewed in a direction orthogonal to the photographing optical axis OA although not shown. The rear sheet metal portion 37 is fixed to the rear case 13 in parallel with the back wall portion 13a (the inner wall surface). The rear sheet metal part 37 is provided with a plurality of connection projections 37a (only two are shown in FIG. 3) and a receiving hole part 37b. Each connection protrusion 37a constitutes a contact portion between the main body sheet metal part 36 and the rear sheet metal part 37, and a part of the rear sheet metal part 37 is formed to protrude to the front side (second substrate 33 side). ing. Each connection projection 37a is pressed against the rear end 36b of the main body sheet metal 36 in the assembled state as will be described later. The receiving hole portion 37b allows the connector member 33d mounted on the second substrate 33 to pass therethrough. In this embodiment, the receiving hole portion 37b is electrically connected to a ground wire (not shown) provided there when the connector member 33d is inserted. Although not shown, the ground wire is an electric wire that is electrically connected to the ground wire 14e (see FIG. 4) in the connection cord 14 when the connector portion 14a of the connection cord 14 is connected to the connector member 33d.

  Next, an assembly procedure (method) of the imaging apparatus 10 will be described.

  In the imaging device 10, first, the interval ring 22 and the optical element group 21 are inserted into the holding hole 12 a of the front case 12. Specifically, the lens 21f, the lens 21e, and the lens 21d are inserted into the small inner diameter portion 12f of the holding hole 12a in this order, and the interval ring 22 into which the lens 21c and the lens 21b are inserted is inserted into the holding hole 12a. Insert into the inner diameter portion 12e. Then, in each second contact groove 12k that opens the inner peripheral surface of the inner diameter portion 12e, the other end portion 35b (the front end) of each front sheet metal portion 35 contacts the spacing ring 22 (the outer peripheral surface).

  Thereafter, the lens 21a and the light shielding plate 23 are inserted into the large inner diameter portion 12d of the holding hole 12a while the sealing member 25 is disposed in the sealing annular groove 12b, and the rear end portion 24b (the screw thread) of the retaining member 24 is inserted. The imaging optical system 20 is held in the front case 12 by meshing with the mounting groove 12c (its thread). Then, as described above, the sealing member 25 is appropriately compressed, and water, dust, and the like between the front case 12 and the imaging optical system 20 (lens 21a) from the outer surface S side of the front case 12 and the like. Intrusion is prevented and sufficient sealing performance is obtained (see FIG. 3). Further, on the inner side of the sealing member 25 as viewed in the radial direction, the back surface of the lens 21 a and the front end surface 22 c of the spacing ring 22 are in contact with each other with the light shielding plate 23 interposed therebetween.

  Next, the image pickup device 31, the electronic component 32 a, and the connector member 32 b are mounted on the first substrate 32, and the first substrate 32 is set so that the image pickup device 31 is in focus adjustment with respect to the image pickup optical system 20. Positioning. The positioned first substrate 32 is fixed to the four support wall portions 12i of the front case 12 via fixing members (not shown). The base end part 36a of the cylindrical main body sheet metal part 36 is inserted into the first contact groove 12j while surrounding the four support wall parts 12i of the front case 12, and the main body sheet metal part 36 is fixed to the front case 12. . Then, the base end part 36a of the main body sheet metal part 36 is pressed against the one end part 35a of each front sheet metal part 35 in the second contact groove 12k.

  Next, the electronic component 33a, the connector member 33b, the electronic component 33c, and the connector member 33d are mounted on the second substrate 33. The second substrate 33 is inserted into the main body sheet metal portion 36, and the connector member 33b is connected to the connector member 32b of the first substrate 32 supported by the front case 12. Thereafter, a protrusion (not shown) of the second substrate 33 is inserted into a support portion (not shown) of the main body sheet metal portion 36 to fix the main body sheet metal portion 36 and the second substrate 33. At this time, in the main body sheet metal portion 36, when the second substrate 33 is accommodated inward, the main body sheet metal portion 36 is electrically connected to a circuit reference potential in a predetermined electronic circuit formed by each electronic component mounted on both the substrates including the first substrate 32. Connected. In this embodiment, although not shown, a connection line with a circuit reference potential provided on the second substrate 33 is electrically connected to the main body sheet metal part 36.

  Thereby, a desired electronic circuit having the image sensor 31 is formed by each substrate (32 and 33), and the electronic circuit unit 30 (attached to the front case 12 in this example) surrounded by the main body sheet metal part 36 is formed. Composed.

  Next, the rear sheet metal part 37 is attached to the rear case 13, and the electronic circuit unit 30 attached to the front case 12 while the connector member 33d mounted on the second substrate 33 is passed through the receiving hole part 37b is relatively The electronic circuit unit 30 is inserted into the rear case 13 by being inserted into the rear case 13 along the photographing optical axis OA. Then, the rear end part 36b of the main body sheet metal part 36 is pressed against each connection projection part 37a of the rear sheet metal part 37, and the receiving hole part 37b and the ground wire (not shown) of the connector member 33d are electrically connected. Is done. Thereafter, the front case 12 and the rear case 13 are fixed by fixing the front case 12 and the rear case 13 with the sealing member 15 interposed between the rear end surface of the front case 12 and the front end surface of the rear case 13. The case 13 is joined in a sealing manner.

  Next, the connector portion 14a is electrically connected to the connector member 33d of the second substrate 33 of the electronic circuit unit 30 while the O-ring 14b is interposed between the rear case 13 and the connection cord to the rear case 13. 14 are connected in a sealing manner. Thereby, the imaging device 10 (see FIG. 3) having a waterproof function and a dustproof function to the imaging optical system 20 and the electronic circuit unit 30 from the outside on the back side of the front case 12 is assembled by the housing 11. From this, in the imaging device 10, the imaging optical system 20 and the electronic circuit unit 30 are accommodated and formed in the housing | casing 11 as an accommodating member which consists of an insulator and has sealing performance. Inside the housing 11, each front sheet metal part 35, a main body sheet metal part 36 with a base end part 36a pressed against one end part 35a, and a rear end part 36b pressed against each connection projection part 37a. The rear sheet metal portion 37 thus formed forms an electromagnetic shield that surrounds the electronic circuit unit 30 and is electrically connected to a circuit reference potential in the electronic circuit. This assembling method is not limited to the present embodiment.

  The imaging device 10 can be attached to a desired location via both attachment projections 13 c of the rear case 13. For example, as shown in FIG. 5, the imaging device 10 is installed in the vicinity of a bumper, a number plate, or the like at the rear of the vehicle C, so that a rear view assisting mechanism 80 for assisting the passengers, particularly the driver, to visually recognize the rear of the vehicle. Can be used as an in-vehicle camera. In the rear view assisting mechanism 80, the imaging device 10 causes the rear end position of the vehicle C (the trunk lid in the illustrated example) to target a wide-angle range centered on the image of the rear obliquely lower region of the vehicle C. The upper end of the rear end surface of the vehicle C is provided obliquely downward to the rear of the vehicle C.

  The rear visual recognition support mechanism 80 includes a control unit 81 connected to the imaging device 10 via the connection cord 14 and a monitor 82 connected to the imaging device 10 via the control unit 81. In the rear view assisting mechanism 80, the control unit 81 displays an image behind the vehicle on the monitor 82 based on the electrical signal (image data) output from the imaging device 10 (its connection cord 14). Although not shown, the control unit 81 is switched when the transmission gear (not shown) of the vehicle C is switched to the reverse (reverse), or when a signal for displaying an image of the rear of the vehicle is input. An image behind the vehicle acquired by the imaging device 10 is displayed on the monitor 82. The monitor 82 is a display unit provided at a position in the passenger compartment of the vehicle C that facilitates visual recognition by an occupant, particularly a driver. Although not shown, the monitor 82 may also serve as a display unit of the navigation system. For this reason, the occupant, particularly the driver, can easily recognize the rear of the vehicle C from the image of the monitor 82 when the rear confirmation of the vehicle C is required. Can help.

  In this rear view assisting mechanism 80, the vehicle C as a reference potential position in the vehicle C is connected to the vehicle C via the control unit 81 connected to the connection cord 14 (its ground wire 14 e) of the imaging device 10. Connected to the constituting body. For this reason, in the imaging device 10 used in the rear view assisting mechanism 80, the body of the vehicle C is in the external reference potential position, and the circuit reference potential in the electronic circuit of the electronic circuit unit 30 is equal to the external reference potential.

  In the imaging device 10, the first lens (objective lens) located closest to the subject (object) in the optical element group 21 of the imaging optical system 20, that is, the surface of the lens 21 a that constitutes a part of the outer surface of the imaging device 10. The back surface is electrically connected to the circuit reference potential (external reference potential) via the light shielding plate 23, the spacing ring 22 and the shield case 34. More specifically, the front end surface 22c of the spacing ring 22 having the same conductivity is in contact with the back surface of the lens 21a with a conductive light shielding plate 23 interposed therebetween. The other end portions 35b of the front sheet metal portions 35 provided in the front case 12 are in contact with each other, and the base end portion 36a of the main body sheet metal portion 36 is in contact with each of the front sheet metal portions 35 with the one end portion 35a. The main body sheet metal part 36 is electrically connected to a connection line (not shown) with a circuit reference potential provided on the second substrate 33, and the rear end part 36 b is connected to each connection protrusion of the rear sheet metal part 37. The rear sheet metal portion 37 is pressed against the portion 37a, and is electrically connected to the ground wire 14e in the connection cord 14 through the receiving hole portion 37b through the ground wire (not shown) of the connector member 33d. For this reason, the back surface of the lens 21a is electrically connected to the circuit reference potential (external reference potential). Then, in the lens 21a, it can suppress that dust adheres resulting from static electricity. This can be considered as follows.

  In the lens 21a held in the housing member (housing 11) that is an insulator like the imaging device 10, as shown in FIG. 6A, when the surface is charged with static electricity, the static electricity may be released. Since this is not possible, dust in the air charged with the polarity opposite to the polarity charged on the surface is adsorbed. However, in the imaging device 10 according to the present invention, the conductive light shielding plate 23 provided on the back surface of the lens 21a is electrically connected to the circuit reference potential (external reference potential) via the spacing ring 22 and the shield case 34. 6 (b), even if static electricity is charged on the front surface of the lens 21a, it is possible to supply the reverse polarity charge to the back surface (light shielding plate 23). The potential can be neutralized in the lens 21a. For this reason, in the lens 21a whose back surface is set to the circuit reference potential (external reference potential), it is possible to suppress adsorption of dust in the charged air.

  Thus, in the imaging device 10, the back surface of the lens 21a as the first lens constituting a part of the outer surface of the imaging device 10 is a circuit in a predetermined electronic circuit by each electronic component mounted on the substrate via the conductive member. Since it is electrically connected to the reference potential, it is possible to suppress dust from adhering to the surface of the lens 21a due to static electricity.

  Further, in the imaging device 10, as a conductive member that connects the back surface of the lens 21a and the circuit reference potential, electromagnetic waves are emitted from the electronic circuit to the surroundings, and the influence of the electromagnetic waves from the surroundings to the electronic circuit is prevented. In order to construct an electromagnetic shield for this purpose, the shield case 34 that is electrically connected to the circuit reference potential in the electronic circuit is used, so that the surface of the lens 21a is caused by static electricity while preventing an increase in the number of components. Thus, it is possible to suppress dust from adhering.

  Further, in the imaging apparatus 10, each lens of the optical element group 21 of the imaging optical system 20 (in this embodiment, the lens 21a, the lens 21b, and the lens 21c) is used as a conductive member that connects the back surface of the lens 21a and the circuit reference potential. And the interval ring 22 that holds the interval in the photographic optical axis OA direction between the opposing surfaces of the lens 21d) at a predetermined value is used as a conductive configuration, thereby preventing an increase in the number of components. However, it is possible to suppress dust from adhering to the surface of the lens 21a due to static electricity.

  In the imaging device 10, as a conductive member that connects the back surface of the lens 21 a and the circuit reference potential, in the optical element group 21, the interval in the photographic optical axis OA direction between the opposing surfaces of the lens 21 a and other lenses is a predetermined value. Since the spacing ring 22 in which the front end face 22c is brought into contact with the back surface of the lens 21a is used as a conductive configuration, a new one only for contact between the back surface of the lens 21a and the spacing ring 22 is used. Since the configuration is not required, it is possible to suppress dust from adhering to the surface of the lens 21a due to static electricity with a simple configuration.

  In the imaging device 10, the spacing ring 22 has conductivity, and each front sheet metal portion 35 of the shield case 34 is electrically connected only to the configuration in which the spacing ring 22 and the main body sheet metal portion 36 are electrically connected. Since it is possible to use the spacing ring 22 and the shield case 34 as the sexual member, it is possible to suppress the dust from adhering to the surface of the lens 21a due to static electricity with a simple configuration.

  In the imaging device 10, the front end surface 22 c of the spacing ring 22 is brought into contact with the back surface of the lens 21 a inside the sealing member 25 viewed in the radial direction (in this embodiment, a light shielding plate 23 is interposed). Therefore, the sealing member 25 can make the casing 11 have sealing performance in all directions, and the sealing member 25 causes dust on the surface of the lens 21a due to static electricity. It is possible to prevent the rear surface of the lens 21a from being set to the circuit reference potential so as to suppress the adhesion.

  In the imaging device 10, the light shielding plate 23 having conductivity is provided along the back surface of the lens 21 a, and the back surface of the lens 21 a and the spacing ring 22 (the front end surface 22 c) are brought into contact with each other through the light shielding plate 23. Therefore, even if the contact resistance between the back surface of the lens 21a and the spacing ring 22 (the front end surface 22c) is large, the back surface of the lens 21a can be used as the circuit reference potential.

  In the imaging device 10, the light shielding plate 23 having conductivity is provided along the back surface of the lens 21 a, and the back surface of the lens 21 a and the spacing ring 22 (the front end surface 22 c) are brought into contact with each other through the light shielding plate 23. Therefore, the area where the light-shielding plate 23 exists in the back surface of the lens 21a can be more reliably set as the circuit reference potential, so that a wide range can be stably set as the circuit reference potential on the back surface of the lens 21a. . For this reason, it can suppress that dust adheres to the surface of the lens 21a more efficiently resulting from static electricity.

  In the imaging device 10, an electronic circuit including each electronic component mounted on the substrate is electrically connected to the ground wire 14 e in the connection cord 14, and the rear sheet metal part 37 (its receiving hole part 37 b) of the shield case 34 is provided. It is electrically connected to the ground wire 14e in the connection cord 14 via the ground wire (not shown) of the connector member 33d, and the ground wire 14e is connected to the body of the vehicle C that is the external reference potential position. For this reason, it is possible to more stably suppress the dust from adhering to the surface of the lens 21a due to static electricity.

  In the imaging apparatus 10, the light shielding plate 23 that prevents light from entering from the outside of the effective diameter (effective luminous flux diameter) of the lens 21 a in the optical element group 21 (imaging optical system 20) has conductivity. Since a conductive member is interposed between the back surface of the lens 21a and the spacing ring 22 (the front end surface 22c), a new configuration only for contact between the back surface of the lens 21a and the spacing ring 22 is provided. Since it is not necessary, it is possible to prevent dust from adhering to the surface of the lens 21a due to static electricity with a simple configuration.

  In the imaging apparatus 10, since the light shielding plate 23 has conductivity by applying a conductive paint on the surface, dust adheres to the surface of the lens 21a due to static electricity with a simple configuration. Can be suppressed.

  In the imaging device 10, since the conductive paint applied to the surface of the light shielding plate 23 is black, it is possible to prevent light incident from the surface of the lens 21 a from being irregularly reflected.

  In the imaging apparatus 10, the shield case 34 is configured to surround the electronic circuit unit 30 with the front sheet metal part 35, the main body sheet metal part 36, and the rear sheet metal part 37, and predetermined electronic components by each electronic component mounted on each substrate. Since it is electrically connected to a circuit reference potential (external reference potential) in the circuit, an electromagnetic shield in the electronic circuit unit 30 can be configured, and electromagnetic waves are emitted from the electronic circuit described above to the surroundings. The influence of electromagnetic waves from the periphery to the electronic circuit can be prevented. That is, the shield case 34 has a function as a conductive member that connects the back surface of the lens 21a to a circuit reference potential (external reference potential) position, and also has a function as an electromagnetic shield.

  In the imaging device 10, the spacing ring 22 in the optical element group 21 (imaging optical system 20) has conductivity, but the spacing ring 22 has a potential equal to the shield case 34 constituting the electromagnetic shield. Therefore, it is possible to prevent the spacing ring 22 from acting as an antenna that emits electromagnetic waves from the electronic circuit or an antenna that receives electromagnetic waves from the periphery.

  In the imaging device 10, as a conductive member that connects the back surface of the lens 21a to a circuit reference potential or an external reference potential, an interval for holding the interval in the photographic optical axis OA direction between the opposing surfaces of each lens at a predetermined value. Since the ring 22 and the shield case 34 constituting the electromagnetic shield are used, for example, only the back surface of the lens 21a and the circuit reference potential or the external reference potential are suppressed in order to prevent dust from adhering to the surface of the lens 21a. Therefore, it is not necessary to add a new part such as connecting with a flexible substrate, so that downsizing can be facilitated.

  Since the imaging device 10 is configured to be able to be downsized while ensuring sealing performance and to suppress the adhesion of dust to the surface of the lens 21a, it can be easily mounted at an arbitrary position. It is suitable for use as a surveillance camera. As described above, since it is easy to attach the vehicle to an arbitrary position, for example, it is possible to attach the vehicle to the vehicle in consideration of the ease of wiring of the connection cord 14, so that a rear view assisting mechanism by the occupant is configured. It can also be made easy.

  Therefore, in the imaging device 10 according to the present invention, dust is prevented from adhering to the surface of the lens 21a as the first lens in the imaging optical system 20 accommodated in the housing 11 as the accommodating member made of an insulator. Can do.

  In the above-described embodiment, the imaging apparatus 10 as an example of the imaging apparatus according to the present invention has been described. However, an electronic circuit unit including an imaging element for obtaining a subject image formed by the imaging optical system; An imaging apparatus comprising: an imaging member that accommodates the imaging optical system and the electronic circuit unit while exposing a surface of a first lens disposed on a subject side in the imaging optical system, wherein the imaging lens includes the imaging lens. Any imaging device or in-vehicle camera provided with a conductive member that connects a back surface opposite to the front surface and a circuit reference potential position in the electronic circuit unit is not limited to the above-described embodiment.

  Further, in the above-described embodiment, the light shielding plate 23 in which the conductive paint is applied is provided on the back surface of the lens 21a as the first lens in the imaging optical system 20. However, the lens without the light shielding plate 23 is provided. The back surface of 21a and the conductive member (the front end surface 22c of the spacing ring 22) may be in direct contact, and are not limited to the above-described embodiments.

  Furthermore, in the above-described embodiment, the light shielding plate 23 provided on the back surface of the lens 21a is made conductive by applying a conductive paint, but a conductive material (for example, It may be formed of a copper plate or the like, and is not limited to the above-described embodiment.

  In the above-described embodiment, the light shielding plate 23 coated with the conductive paint is provided on the back surface of the lens 21a as the first lens in the imaging optical system 20, but instead of the light shielding plate 23, the back surface of the lens 21a. A coating material having conductivity as a conductive material may be applied to the outside of the effective system, and is not limited to the above-described embodiments. At this time, if the coating material to be applied is black, in addition to electrically connecting the back surface of the lens 21a and the conductive member (the front end surface 22c of the spacing ring 22), light incident from the surface of the lens 21a Can be irregularly reflected.

  In the above-described embodiment, the light shielding plate 23 coated with the conductive paint is provided on the back surface of the lens 21a as the first lens in the imaging optical system 20, but instead of the light shielding plate 23, the back surface of the lens 21a. The outside of the effective system and the conductive member (the front end face 22c of the spacing ring 22) may be bonded by a conductive adhesive material as a conductive material, and is not limited to the above-described embodiment. With such a configuration, the back surface of the lens 21a and the conductive member (the front end surface 22c of the spacing ring 22) can be more stably brought into contact with each other, so that it is more efficient that dust adheres to the surface of the lens 21a. It can be well suppressed.

  In the above-described embodiment, the light shielding plate 23 coated with the conductive paint is provided on the back surface of the lens 21a as the first lens in the imaging optical system 20, but instead of the light shielding plate 23, the back surface of the lens 21a. In addition, a transparent and conductive thin film may be deposited, and the present invention is not limited to the above-described embodiments. For example, ITO (indium tin oxide) can be used as the transparent conductive thin film. Since such a transparent conductive thin film can be made extremely thin, it hardly affects the optical path of light incident on the lens 21a (first lens), so that the design of the optical path is changed. Therefore, an increase in the number of manufacturing processes can be minimized. With such a configuration, since a wide range can be stably set as the circuit reference potential (external reference potential) on the back surface of the lens 21a, dust adheres to the surface of the lens 21a more efficiently due to static electricity. This can be suppressed.

  In the above embodiment, the light shielding plate 23, the spacing ring 22 and the shield case 34 are used as the conductive members. However, the back surface of the lens 21a and the circuit reference potential (external reference potential) are electrically connected. If so, for example, a shield case constituted by a resin casing covered with a metal film may be used, and the present invention is not limited to the above-described embodiment.

  In the above-described embodiment, the spacing ring 22 as the conductive member defines the distance between the lens 21a and the other lens. However, the spacing ring 22 may define the distance between different lenses. The present invention is not limited to the examples. However, as in the above-described embodiment, when the distance between the first lens (lens 21a) arranged closest to the subject in the optical element group 21 (imaging optical system 20) and another lens is defined, the lens The spacing ring 22 can be provided in contact with the back surface of 21a, and the back surface of the lens 21a can be connected to the circuit reference potential (external reference potential) without using another conductive member.

  In the above-described embodiment, the spacing ring 22 is formed of aluminum. However, other conductive materials can be used as long as they have conductivity to connect the back surface of the lens 21a and the circuit reference potential (external reference potential). It may be formed of a conductive member (for example, stainless steel), or may be one in which a conductive material is applied to the surface, and is not limited to the above-described embodiments.

  In the above-described embodiment, the back surface of the lens 21a is connected to a circuit reference potential (external reference potential) in a predetermined electronic circuit formed by each electronic component mounted on each substrate. It may be electrically connected to the above, and is not limited to the above-described embodiments.

  In the above-described embodiment, the casing 11 having the front case 12 that supports the imaging optical system 20 and the rear case 13 that stores the electronic circuit unit 30 is used as a storage member. However, the storage member is an insulator. It is sufficient to accommodate the imaging optical system 20 and the electronic circuit unit 30 while exposing the surface of the first lens (lens 21a), and is not limited to the above-described embodiment.

  In the above-described embodiment, the imaging apparatus 10 is described as being used as an in-vehicle camera that constitutes the rear visual recognition support mechanism 80. For example, an in-vehicle camera as a drive recorder for recording the situation of an accident in the vehicle, or a vehicle The present invention can be widely applied as a surveillance camera in a vehicle interior, a surveillance camera mounted on an ATM, a toy camera, and the like, and is not limited to the above-described embodiments.

  As mentioned above, although the imaging device of the present invention has been described based on the embodiment, the specific configuration is not limited to this embodiment, and design changes, additions, and the like can be made without departing from the gist of the present invention. Permissible.

DESCRIPTION OF SYMBOLS 10 Imaging device 11 Case (as an example of a storage member) 14 Connection cord (as an example of a connecting portion) 20 Imaging optical system 21a (As an example of a first lens) Lens 22 Space ring 23 (Example of a conductive member) As a light shielding plate 30 electronic circuit unit 31 image pickup device 34 shield case (as an example of electromagnetic shield) 35 front sheet metal part (as an example of electromagnetic shield constituting the conductive member) 36 (electromagnetic constituting the conductive member) Body sheet metal part 37 (as an example of a shield) 37 Rear sheet metal part OA (as an example of an electromagnetic shield constituting a conductive member)

JP 2006-153993 A

Claims (7)

An electronic circuit unit including an image sensor for acquiring a subject image formed by the imaging optical system, the imaging optical system and the imaging optical system while exposing a surface of a first lens disposed on the subject side in the imaging optical system An imaging device comprising: a housing member that houses an electronic circuit unit;
In order to prevent light from entering from the outside of the effective diameter of the first lens , provided in contact with the back surface of the first lens opposite to the front surface , provided with a light shielding member having conductivity,
Said first lens, an imaging device which is characterized that it is connected to a circuit reference potential position in the electronic circuit unit through said light blocking member. The imaging apparatus according to claim 1,
Furthermore, a distance ring in the imaging optical axis direction between the opposing surfaces of each optical member of the imaging optical system is maintained at a predetermined value and has a conductivity ring .
Said first lens, said light blocking member and said that to that imaging device, wherein via the spacer ring is connected to the circuit reference potential location. The imaging apparatus according to claim 1 or 2,
Further comprising the electronic circuit that conductive magnetic shield having a conductivity provided around the unit in the inside of the accommodating member,
Said first lens, said light blocking member and the said circuit a reference potential is connected to the position they characterized as to that an imaging device isosamples through an electromagnetic shield. The spacing ring is imaging apparatus according to claim 2, characterized that you have provided in contact via the light shielding member on the back surface of the first lens. Between the back surface of the first lens and the housing member, an annular sealing member surrounding the photographing optical axis is provided,
The spacing ring is imaging apparatus according to claim 4, characterized in Tei Rukoto contact via the light shielding member on the back surface of the first lens in the inside of the sealing member. The imaging apparatus according to any one of claims 1 to 5, wherein:
Furthermore, the electronic circuit unit comprises a connection part for connecting the outside of the housing member,
The circuit reference potential location is outside the external reference potential located is connected you wherein Rukoto imaging device of the housing member via the connecting portion. The light blocking member, an imaging apparatus according to any one of claims 1 to 6, wherein the black der Rukoto.