JP2014075825A - Camera unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera unit which has high durability against static electricity and excellent electromagnetic wave shield performance without causing high cost.SOLUTION: A shield plate 26 covering a circuit board 25 is connected with a ground wire A3 and a drain wire at an end part of a cable 40. In this case, static electricity transmitted to the shield plate 26 flows into a ground of a power source device through the drain wire without going through the circuit board 25. In other words, failures caused by the occurrence of a high voltage is avoided. Further, since the circuit board 25 is covered by the shield plate 26 at a ground potential, good electromagnetic wave countermeasure effect is achieved. Furthermore, a block 41 is attached to an area near the end part of the cable 40 by molding and the block 41 is fixed to a rear case 22B of a camera housing through an O ring. Thus, the waterproofness of an on-vehicle camera is secured by a small size structure. Additionally, the structure improves the workability for attaching the cable 40 to the on-vehicle camera.

Description

  The present invention relates to a camera unit and a sensing device, and more particularly to a camera unit that outputs an image signal and a sensing device including the camera unit.

  A vehicle-mounted camera (hereinafter abbreviated as “vehicle-mounted camera”) is attached to the outside of the vehicle, and thus requires high waterproof performance despite its small size. Furthermore, the cable that connects the in-vehicle camera and the display (display device) in the vehicle is routed about 10 m.

  By the way, there are many sources of electromagnetic waves such as engines and motors in the car, and the cables that are routed are affected by them and noise is superimposed on the camera image. There is a concern that noise may be generated in the radio. Therefore, countermeasures against electromagnetic waves in in-vehicle cameras are important.

  In-vehicle cameras are also required to operate normally in harsh natural environments. Not only overseas but also in Japan, especially in the winter, when dryness is intense, static electricity is frequently generated when the user's hand touches the in-vehicle camera, so high resistance to static electricity is required.

  A circuit board on which electronic components such as a sensor and an image processing circuit are mounted is housed inside the housing of the in-vehicle camera (see, for example, Patent Document 1). Therefore, if a sufficient countermeasure is not taken, when a high voltage due to static electricity is applied, not only malfunction but also damage to parts may occur. In recent years, since cameras are also related to safety performance in driving, malfunctions and component destruction can have a significant impact on human life, and sufficient measures are required.

  Conventional in-vehicle cameras have suppressed the discharge of static electricity by making the casing an insulator such as plastic.

  When there is a strong electromagnetic wave radiation source inside, a metal shield plate directly connected to the ground (GND) of the circuit board is arranged in the housing. For this reason, a technique for connecting the ground of the circuit board (GND) to the ground of the external power source via a cable is considered in preparation for the case where static electricity falls on the metal shield plate or the circuit board due to the gap between the insulators, etc. ing.

  In addition, as an example other than an in-vehicle camera, a connector is known that covers an exterior with a metal connected to a shield wire of a cable and allows static electricity to flow to the ground to which the cable is connected (see, for example, Patent Document 2).

  However, in the conventional in-vehicle camera in which the circuit board is covered with an insulator, the discharge is less likely to occur, and the probability of malfunction or component destruction is merely reduced. In addition, when there is no metal shield plate inside, if the static electricity falls, it is impossible to predict where the circuit board will be discharged.

  In addition, even when a metal shield plate is provided, the ground (GND) of the circuit board and the metal shield plate are directly connected at a specific location. Through to the outside earth. In this case, a high voltage is applied to the circuit board for a moment but a load is applied to the electronic components. Therefore, it has been difficult to reliably avoid breakdown due to static electricity. In short, electrostatic discharge is less likely to occur by covering the circuit board with an insulator, but when discharge occurs, a high voltage is applied to the circuit board regardless of the presence or absence of the metal shield plate.

  Therefore, it is conceivable to place components that are vulnerable to high voltage where the influence of discharge on the circuit board is small, but changing the circuit board is not easy, and it is expected that it will take time and cost to take countermeasures. .

  In the above connector example, strong resistance against static electricity can be ensured because there is a connection from the metal exterior to the ground. However, even if it is used for an in-vehicle camera, the electromagnetic wave source or circuit board ground (GND) Because there is no connection with, it is not a countermeasure against electromagnetic waves.

  The present invention has been made under such circumstances, and a first object of the present invention is to provide a camera unit that has high resistance to static electricity and excellent electromagnetic shielding properties without incurring high costs. There is to do.

  A second object of the present invention is to provide a sensing device with excellent reliability without incurring an increase in cost.

  From a first aspect, the present invention includes an image sensor, a circuit board on which a circuit including a processing circuit for processing a signal from the image sensor is formed, a signal conductor, and a ground conductor. A cable having one end connected to the circuit board and a shield member that covers the circuit board, and the grounding conductor is provided near the one end of the cable. The camera unit is connected to a ground terminal and the shield member.

  According to this, it is possible to have high resistance to static electricity and excellent shielding properties against electromagnetic waves without incurring high costs.

  From a second aspect, the present invention is a sensing device including at least one camera unit of the present invention and a display device that displays information from the at least one camera unit.

  According to this, it becomes possible to improve reliability without incurring cost increase.

It is an external view of the vehicle carrying a vehicle-mounted camera. It is a block diagram for demonstrating the structure of the back monitor apparatus which concerns on one Embodiment of this invention. FIG. 3A to FIG. 3C are diagrams for explaining the vehicle-mounted camera. It is a figure for demonstrating the modification of a shield board. It is a block diagram for demonstrating the structure of a signal processing circuit. It is a figure for demonstrating the structure of a cable. It is FIG. (1) for demonstrating the connection end vicinity with the vehicle-mounted camera of a cable. It is FIG. (2) for demonstrating the connection end vicinity with the vehicle-mounted camera of a cable. It is FIG. (1) for demonstrating the work procedure at the time of connecting a cable to a vehicle-mounted camera. It is FIG. (2) for demonstrating the work procedure at the time of connecting a cable to a vehicle-mounted camera. It is FIG. (3) for demonstrating the work procedure at the time of connecting a cable to a vehicle-mounted camera. It is FIG. (4) for demonstrating the work procedure at the time of connecting a cable to a vehicle-mounted camera. It is a figure for demonstrating the filter circuit in a circuit board. It is a figure for demonstrating the grounding method of the shield board in the conventional vehicle-mounted camera. It is a figure for demonstrating the grounding method 1 of the shield board in the vehicle-mounted camera of this embodiment. It is a figure for demonstrating the grounding method 2 of the shield board in the vehicle-mounted camera of this embodiment. It is a block diagram for demonstrating the structure of an audio | voice / alarm generator. It is a figure for demonstrating the modification 1 of a structure of a cable. It is a figure for demonstrating the modification 2 of the structure of a cable. It is a figure for demonstrating the modification 3 of the structure of a cable. It is a figure for demonstrating the state of the cable end when the cable of the modification 3 is used. It is a figure for demonstrating the modification of a shield board. FIG. 23A and FIG. 23B are views (No. 1) for describing a first modification of the cable end portion. 24 (A) to 24 (C) are diagrams for explaining caulking members used for the cable ends of the first modification. It is FIG. (2) for demonstrating the modification 1 of a cable edge part. FIGS. 26A and 26B are views (No. 3) for describing the first modification of the cable end portion. It is FIG. (4) for demonstrating the modification 1 of a cable edge part. FIG. 28A and FIG. 28B are views (No. 1) for describing a second modification of the cable end portion, respectively. It is FIG. (2) for demonstrating the modification 2 of a cable edge part. FIG. 30A and FIG. 30B are views (No. 1) for explaining a third modification of the cable end portion, respectively. It is FIG. (2) for demonstrating the modification 3 of a cable edge part. It is FIG. (3) for demonstrating the modification 3 of a cable edge part. It is a figure for demonstrating the modification 4 of a cable edge part. It is FIG. (1) for demonstrating the modification 5 of a cable edge part. It is FIG. (2) for demonstrating the modification 5 of a cable edge part.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the appearance of a vehicle 1 equipped with an in-vehicle camera 20 according to an embodiment.

  The in-vehicle camera is installed on the rear (rear), front (front), and side (side) of the vehicle, and displays the periphery of the vehicle on a display device such as a liquid crystal monitor in the vehicle for the purpose of assisting the driver's vision. Is. Many systems have a wide viewing angle in order to provide a highly safe system with no blind spots. In addition, since it is desired that the vehicle is not conspicuous in terms of design, the camera is required to be small.

  In addition, since the in-vehicle camera for the rear (back) monitor, which is currently mainstream, is installed outside the vehicle, waterproofness is required. Furthermore, the in-vehicle camera is installed near the trunk at the rear of the vehicle, but the display device is located beside the driver's seat, so it is necessary to route the cable as much as 10 m. There is a demand for tensile strength that can withstand this routing, prevention of malfunction due to electromagnetic waves radiated from various electromagnetic wave generation sources, and prevention of adverse effects on devices such as FM radio and AM radio. Also, in winter and the like, a charged person can touch the camera, so it is necessary to ensure sufficient resistance to static electricity.

  Here, as an example, the in-vehicle camera 20 is attached to the rear portion of the vehicle 1 outside the vehicle 1. In the present specification, in the XYZ three-dimensional orthogonal coordinate system, the gravity direction is described as the Z-axis direction, and the forward direction of the vehicle 1 is described as the + X direction.

  As shown in FIG. 2 as an example, an information processing apparatus 30 that processes image information from the in-vehicle camera 20 is mounted in the vehicle 1. The information processing device 30 and the in-vehicle camera 20 are connected via a cable 40.

  The information processing device 30 includes an input / output interface 31, a display device 32, a main control device 33, a memory 34, a voice / alarm generating device 35, and the like. The information processing device 30 is supplied with power from the power supply device 50.

  Here, the back monitor device 10 is configured by the in-vehicle camera 20, the information processing device 30, and the cable 40.

  As shown in FIG. 3A to FIG. 3C as an example, the in-vehicle camera 20 includes a lens system 21, a camera housing 22, a CMOS (Complementary Metal Oxide Semiconductor) image sensor 24, a circuit board 25, and a shield. A plate 26 and the like are provided. Here, it is assumed that the −X side end of the cable 40 is connected to the in-vehicle camera 20.

  The lens system 21 is designed to have a wide angle of view of about 120 to 190 degrees so that the left and right sides of the vehicle can be confirmed with images. The lens system 21 includes six lenses as an example in order to obtain a high-quality image.

  The camera housing 22 is a resin molded product having a quadrangular prism shape. The camera housing 22 has a holding portion for holding the lens system 21 at the end on the −X side, and an opening for inserting the cable 40 at the center of the end surface on the + X side. And the screw hole for screwing the cable 40 is provided in the + Y side and -Y side of this opening part.

  The camera housing 22 can be divided into a portion on the −X side (hereinafter referred to as “front case 22A”) and a portion on the + X side (hereinafter referred to as “rear case 22B”). The front case 22A and the rear case 22B are integrated by fitting.

  An O-ring is attached to the gap between the camera housing 22 and the lens system 21 to prevent water from entering the camera housing 22 through the gap. Further, a rubber packing is attached to the fitting portion between the rear case 22B and the front case 22A to prevent water from entering the inside of the camera housing 22 from the fitting portion.

  The CMOS image sensor 24, the circuit board 25, and the shield plate 26 are accommodated in the camera housing 22.

  The CMOS image sensor 24 converts light incident through the lens system 21 into an electrical signal. The CMOS image sensor 24 is attached to the circuit board 25 via a ceramic package.

  The shield plate 26 is a plate-like member made of stainless steel, phosphor bronze, or the like having a thickness of about 0.2 mm, and is provided so as to cover the circuit board 25. Note that an opening of the same degree as the opening is formed in a portion of the shield plate 26 facing the opening of the camera housing 22. The shield plate 26 has a function of shielding electromagnetic waves and a role of receiving electrostatic discharge. The shield plate 26 is attached to a predetermined position of the rear case 22B.

  As an example, as shown in FIG. 4, when the shield plate 26 is separated into the shield plate 26A of the front case 22A and the shield plate 26B of the rear case 22B, the two shield plates are not fitted when fitted. For example, it is necessary to make contact through a metal leaf spring so as to be electrically connected.

  A signal processing circuit, an internal power supply circuit, and the like are formed on the circuit board 25. The circuit board 25 is attached to a predetermined position of the rear case 22B.

  The signal processing circuit receives the output signal of the CMOS image sensor 24, corrects the distortion and brightness of the image, and outputs it as an analog video (NTSC) signal.

  As shown in FIG. 5 as an example, the signal processing circuit includes a CDS / AGC circuit, an A / D conversion circuit, a DSP (digital signal processor), a D / A conversion circuit, an encoder, and the like.

  The CDS / AGC circuit has a CDS (Correlated Double Sampling) circuit that removes reset noise included in a signal from the CMOS image sensor 24, and an AGC (Automatic Gain Control) circuit that amplifies the signal and controls it to a certain level. ing.

  The A / D conversion circuit converts an analog signal output from the CDS / AGC circuit into a digital signal.

  The DSP performs predetermined correction processing or the like on the digital signal output from the A / D conversion circuit.

  The D / A conversion circuit converts a digital signal output from the DSP into an analog signal.

  The encoder converts an analog signal output from the D / A conversion circuit into an analog video signal. This analog video signal becomes an output signal of the signal processing circuit.

  The internal power supply circuit supplies the electric power supplied via the cable 40 to each electronic component mounted on the CMOS image sensor 24 and the circuit board 25.

  As shown in FIG. 6 as an example, the cable 40 includes an analog signal line A1, a power supply line A2, a ground line A3, and a shield material F as conductors.

  The analog signal line A1 is a conductor for transmitting an image signal from the in-vehicle camera 20 to the information processing apparatus 30, and the power supply line A2 transmits power from the power supply apparatus 50 to the in-vehicle camera 20 via the information processing apparatus 30. It is a conductor to supply.

  The analog signal line A1, the power supply line A2, and the ground line A3 are each covered with an insulator B to form so-called insulated wires.

  The three insulated wires are bundled in a substantially circular shape by using the binding member D together with the inclusion C. The binding member D is covered with a shield material F, and the shield material F is further covered with an insulator E as a sheath.

  For the inclusion C, cotton yarn or soft resin is used. Further, paper or tape is used for the binding member D.

  As the shield material F, a plurality of thin wire rods wound or braided, or aluminum tape is used. When using an aluminum tape, if at least one conductor is passed as a drain wire so as to be in contact with the aluminum surface, connection processing at the cable end becomes easy. Here, the shield material F can be used as a conductor for countermeasures against static electricity and electromagnetic waves.

  The insulator E is made of nylon resin, polyethylene resin, or urethane resin.

  As shown in FIG. 7 as an example, at the end of the cable 40 on the −X side, three insulated wires and drain wires are exposed.

  Further, a resin block 41 having two through holes is attached near the end of the cable 40 on the −X side by molding. Here, as the material of the block 41, a resin excellent in adhesiveness with the insulator E is used. Thereby, even if a tensile force acts on the cable 40, it can be prevented from coming off from the block 41. A caulking ring may be fitted on the outer periphery of the insulator E and molded so that the caulking ring is embedded in the resin of the block 41. Thereby, the slip of the cable 40 can be further suppressed.

  Furthermore, as shown in FIG. 8 as an example, the exposed three insulated wires are inserted into the connector with the insulator B in the vicinity of the −X side end portion removed. In the vicinity of the connector, the ground line A3 and the drain line are connected by soldering.

  Here, a connection procedure between the cable 40 and the in-vehicle camera 20 will be briefly described. Here, it is assumed that the camera housing 22 is separated into a front case 22A and a rear case 22B, and the circuit board 25 is not yet attached to the rear case 22B.

(1) As shown in FIG. 9 as an example, the −X side end portion of the cable 40 is connected to the camera housing 22 via the + X side opening of the camera housing 22 and the opening of the shield plate 26. Inserted inside, the block 41 is brought into contact with the rear case 22B. At this time, an O-ring is mounted between the block 41 and the rear case 22B.

(2) As an example, as shown in FIG. 10, a screw is inserted into each through-hole of the block 41 and screwed into a screw hole formed in the rear case 22B. As a result, the block 41 is fixed to the rear case 22B. Since the O-ring is mounted between the block 41 and the rear case 22B, it is possible to prevent water from entering the camera casing 22 from between the block 41 and the rear case 22B.

(3) As an example, as shown in FIG. 11, the drain wire and the shield plate 26 are connected by a conductive wire. Thereby, the ground line A3, the drain line, and the shield plate 26 are electrically connected.

(4) As an example, as shown in FIG. 12, the connector of the cable 40 is connected to a terminal block provided on the circuit board 25, and the circuit board 25 is attached to a predetermined position of the rear case 22B.

(5) The front case 22A is fitted to the rear case 22B.

  On the other hand, an end of the cable 40 on the + X side is attached with a connector such as an RCA jack, a DC plug, and a giboshi, and is connected to the input / output interface 31 of the information processing apparatus 30 via the connector. The shield material F of the cable 40 is connected to the ground on the power supply device 50 side.

  By the way, generally, noise is mixed in the power supply line and the ground line from the outside. Therefore, as shown in FIG. 13 as an example, the circuit board 25 is provided with a filter circuit. The ground line A3 of the cable 40 is connected to the ground terminal of the circuit board 25 through the filter circuit. The power line A2 of the cable 40 is connected to the internal power circuit through the filter circuit.

  Conventionally, as schematically shown in FIG. 14, the ground line A <b> 3 and the drain line are individually connected to the terminal block of the circuit board 25, connected on the circuit board 25, and then connected to the filter circuit. It was. The shield plate 26 is connected to the ground terminal of the circuit board 25. In this case, the shield plate 26, the ground terminal of the circuit board 25, the ground line A3, and the drain line are brought into conduction only by connecting the cable 40 to the circuit board 25 with a connector. However, in this configuration, the static electricity that has fallen on the shield plate 26 always passes through the circuit board 25.

  On the other hand, in this embodiment, as schematically shown in FIG. 15, the ground line A <b> 3, the drain line, and the shield plate 26 are connected at the end of the cable 40. The ground line A3 is connected to the ground terminal of the circuit board 25 through the filter circuit. In this case, since the static electricity that has fallen on the shield plate 26 passes through the drain wire rather than through the circuit board 25, the impedance is reduced by the amount not passing through the filter circuit. No flow into 25. Further, regarding the shielding performance of the electromagnetic wave radiated from the circuit board 25 by the shield plate 26, not only can the tuning be performed by adjusting the constant of the filter circuit, but also the shield plate 26 integrated with the ground can be covered. Sufficient performance can be expected. As an example, as shown in FIG. 16, the shield plate 26 may be further connected to a ground terminal of the circuit board 25. In this case, it is possible to further improve the shielding performance of electromagnetic waves by the shield plate 26.

  That is, at the camera side end of the cable 40, the shield wire or the ground wire and the shield plate 26 covering the circuit board 25 are connected with low impedance, and the ground terminal of the circuit board 25 is connected via the filter circuit. Can be easily formed when the cable 40 is assembled to the in-vehicle camera 20.

  Returning to FIG. 2, the main control device 33 of the information processing device 30 comprehensively controls the entire back monitor device 10. Then, main controller 33 determines the presence or absence of danger based on the output signal of in-vehicle camera 20. For example, if there is a person behind, or there are other vehicles, bicycles, or other obstacles, and a collision or rear-end collision is expected, it is determined that there is a danger, and the alarm information is displayed on the display device 32 and voice / alarm. Output to the generator 35.

  The display device 32 is installed in the vicinity of the driver's seat so that the driver can easily see it. The display device 32 outputs a signal (analog video signal) output from the in-vehicle camera 20 via the analog signal line A1 of the cable 40. Turn into. Further, when the display device 32 receives the alarm information from the main control device 33, the display device 32 displays a corresponding message.

  As shown in FIG. 17 as an example, the voice / alarm generator 35 includes a voice synthesizer 61, an alarm signal generator 62, a speaker 63, and the like.

  The voice synthesizer 61 has a plurality of voice data. Upon receiving alarm information from the main control device 33, the voice synthesizer 61 selects the corresponding voice data and outputs it to the speaker 63.

  When the alarm signal generator 62 receives alarm information from the main controller 33, the alarm signal generator 62 generates a corresponding alarm signal and outputs it to the speaker 63.

  When the main control device 33 determines that there is a danger, the main control device 33 records the output signal of the in-vehicle camera 20 in the memory 34.

  As is clear from the above description, the sensing device of the present invention is configured by the back monitor device 10 according to the present embodiment. And the camera unit of this invention is comprised by the vehicle-mounted camera 20 and the cable 40. FIG.

  The main control device 33 and the sound / alarm generating device 35 constitute a monitoring control device of the present invention.

  As described above, according to the back monitor device 10 according to the present embodiment, the shield plate 26 covering the circuit board 25 of the in-vehicle camera 20 is connected to the ground line A3 and the drain line at the end of the cable 40. ing. In this case, static electricity that has fallen on the shield plate 26 can flow to the ground of the power supply device 50 via the drain wire without passing through the circuit board 25. That is, it is possible to avoid problems due to the generation of high voltage.

  Therefore, the resistance of the in-vehicle camera 20 to static electricity can be improved.

  In addition, since the circuit board 25 of the in-vehicle camera 20 is covered with the shield plate 26 having the ground potential, it is possible to obtain a good electromagnetic wave countermeasure effect.

  Therefore, it is possible to have high resistance to static electricity and excellent shielding properties against electromagnetic waves without incurring high costs.

  Further, the block 41 is attached to the vicinity of the end portion of the cable 40 by molding, and the block 41 is fixed to the camera housing 22 via an O-ring. Can be secured. Moreover, the workability | operativity at the time of attaching the cable 40 to the vehicle-mounted camera 20 can be improved. Further, the tensile strength of the cable 40 can be ensured.

  In addition, an effect of avoiding a follow-up measure after completion of the in-vehicle camera 20 can be expected.

  In the above embodiment, instead of the shield plate 26, a conductive material may be painted or evaporated on the inside of the camera housing 22. In this case, it is necessary to electrically connect the conductive material of the front case 22A and the conductive material of the rear case 22B during assembly.

  Moreover, although the said embodiment demonstrated the case where the camera housing | casing 22 was a resin molded product, it is not limited to this. For example, an aluminum die-cast product may be used. In this case, the camera housing 22 can serve as the shield plate 26, and the shield plate 26 is unnecessary.

  In the above embodiment, instead of the cable 40, as shown in FIG. 18 as an example, the analog signal line A1 is coaxially covered with an insulator B, a shield material F, and an insulator (sheath) E. You may use the cable 40A made into the wire. In this case, impedance control between the analog signal line A1 and the shield material F is possible, and signal deterioration can be suppressed by adjusting the impedance to 50 ohms or 75 ohms. In this case, the coaxial shield material F can be used as a conductor for countermeasures against static electricity and electromagnetic waves.

  Moreover, in the said embodiment, it may replace with the said cable 40 and may use the cable 40B which has the two ground lines A3 as FIG. 19 shows as an example. In this case, the shield material F is unnecessary. The cable 40B is very inexpensive, but is easily affected by external radiation noise, and easily radiates electromagnetic waves from the cable itself. For this reason, the analog signal line A1 and one ground line A3, and the power supply line A2 and the other ground line A3 are preferably twisted together as a twisted pair. In this case, one of the two ground lines A3 can be used as a conductor for countermeasures against static electricity and electromagnetic waves.

  Moreover, in the said embodiment, it replaces with the said cable 40, and as FIG. 20 shows as an example, you may use the cable 40C without the ground wire A3. In this case, the drain line is connected to the ground terminal of the circuit board 25 through the filter circuit. That is, the drain wire can be used as a conductor for countermeasures against static electricity and electromagnetic waves.

  In the above embodiment, the case where the cable 40 has one analog signal line as the signal line has been described. However, the present invention is not limited to this. For example, a plurality of control signal lines may be further provided for performing initial adjustment of a position when a part of the image is enlarged or a vehicle width line is overlaid on the image.

  Moreover, although the said embodiment demonstrated the case where an analog signal was output from the vehicle-mounted camera 20, it is not limited to this, A digital signal may be output from the vehicle-mounted camera 20. However, in this case, it is necessary to add the number of signal lines in the cable 40. Also, the signal processing circuit needs to be replaced with one corresponding to a digital signal.

  Moreover, although the vehicle-mounted camera 20 was attached to the rear part of the vehicle 1 and used for the back monitor apparatus 10 in the said embodiment, it was not limited to this. For example, the in-vehicle camera 20 may be attached to the front portion of the vehicle 1 and used for a device that monitors the front, or the in-vehicle camera 20 may be attached to the side portion of the vehicle 1 and used for a device that monitors the side.

  In the above embodiment, the case where the image sensor is a CMOS image sensor has been described. However, the present invention is not limited to this. For example, a CCD (Charge Coupled Device) image sensor may be used. In this case, a signal processing circuit corresponding to the CCD image sensor is used.

  Moreover, although the said embodiment demonstrated the case where the lens system 21 was comprised from six lenses, it is not limited to this.

  Moreover, although the case where the circuit board was comprised with one board | substrate was demonstrated in the said embodiment, it is not limited to this, A circuit board may be comprised with the several board | substrate. As an example, as shown in FIG. 22, when the circuit board is composed of the circuit board 25A and the circuit board 25B, the shield plate 26 may have a holding part or holding mechanism for holding the circuit board 25B. good.

  Moreover, although the said embodiment demonstrated the case where the ground line A3 and a drain line were connected in the edge part of the -X side of the cable 40, and the drain line and the shield board 26 were connected with a conducting wire, it is limited to this. It is not a thing.

<< Modification 1 >>
In the first modification, as shown in FIG. 23A as an example, the shield material F is also exposed along with the three insulated wires at the end of the cable 40 on the −X side, and the shield material F is folded and insulated. Cover body E. Further, as shown in FIG. 23B, the ground line A3 is branched and the branch line is folded.

  As an example, as shown in FIGS. 24 (A) to 24 (C), it has two strip-like portions (hereinafter referred to as “strip portions 52”) formed by three notches, Using the metal caulking member 51 having springiness, the cable 40 is caulked from the periphery of the exposed shield material F including the branch line (see FIG. 25). Then, as shown in FIG. 26A as an example, the strip 52 of the caulking member 51 is expanded.

  Further, as shown in FIG. 26B, a part of the strip 52 is embedded, and a resin block 42 having two through holes is attached by molding.

  In this case, as shown in FIG. 27 as an example, when the cable 40 is attached to the in-vehicle camera 20, a strip of the metal member 51 is simply inserted into the camera housing at the −X side end of the cable 40. The part 52 is in contact with the shield plate 26. That is, the shield plate 26, the shield material F, the ground line A3, and the ground terminal of the circuit board through the filter can be easily electrically connected. In this case, the caulking member 51 also has a role of increasing the strength against pulling out of the cable 40.

<< Modification 2 >>
In the second modification, as shown in FIG. 28A as an example, at the end on the −X side of the cable 40, the ground wire A3 and the drain wire are connected, and the drain wire and the L-shaped metal plate 53 are connected by a conducting wire. Connect with.

  Then, as shown in FIG. 28B, a part of the metal plate 53 is embedded, and a resin block 43 having two through holes is attached by molding. Here, the surface on the −Z side of the metal plate 53 is exposed.

  In this case, as shown in FIG. 29, a leaf spring 27 is provided on the shield plate 26, and when the cable 40 is attached to the in-vehicle camera 20, the end on the -X side of the cable 40 is inserted into the camera housing. Simply, the metal plate 53 and the leaf spring 27 of the shield plate 26 come into contact with each other. That is, the shield plate 26, the shield material F, the ground line A3, and the ground terminal of the circuit board through the filter can be easily electrically connected. In this case, the shape of the metal plate 53 is simple, and cable processing and handling of the cable 40 are facilitated. In addition, the metal plate 53 should just be a substantially flat part which contacts the leaf | plate spring 27 of the shield board 26. FIG.

<< Modification 3 >>
In Modification 3, as an example, as shown in FIGS. 30A and 30B, the end portion on the −X side of the cable 40 has an opening through which three insulated wires and a drain wire pass. A cap-shaped metal member 54 is used.

  And in the edge part by the side of -X of the cable 40, ground wire A3 and a drain wire are connected, and a drain wire and the metal member 54 are connected with a conducting wire.

  Then, as shown in FIG. 31, a resin block 44 having two through holes is attached by molding so that the surface of the metal member 54 is exposed.

  In this case, as shown in FIG. 32, a leaf spring 27 is provided on the shield plate 26, and when the cable 40 is attached to the in-vehicle camera 20, the end on the −X side of the cable 40 is inserted into the camera housing. Simply, the metal member 54 and the leaf spring 27 of the shield plate 26 come into contact with each other. That is, the shield plate 26, the shield material F, the ground line A3, and the ground terminal of the circuit board through the filter can be easily electrically connected. In this case, since only the opening through which the three insulated wires and the drain wire pass has a shield gap, a stronger electromagnetic wave shielding shield is possible.

  The leaf springs 27 are preferably provided at a plurality of locations in order to improve the electromagnetic wave shielding effect.

  In this case, the metal member 54 may have a strip portion similar to that of the first modification. At this time, the leaf spring 27 is not required for the shield plate 26.

<< Modification 4 >>
In Modification 4, the end of the cable 40 on the −X side is substantially the same as in Modification 1, and the camera housing is made of metal. As an example, as shown in FIG. When attaching to the camera 20, the strip 52 of the metal member 51 comes into contact with the rear case 22 </ b> B simply by inserting the −X side end of the cable 40 into the camera housing. That is, the rear case 22B, the shield material F, the ground line A3, and the ground terminal of the circuit board through the filter can be easily electrically connected. Even if the outer surface of the camera housing is painted, it is preferable that the portion where the strip 52 is in contact is plated without any coating treatment.

<< Modification 5 >>
In Modification 5, as shown in FIG. 34 as an example, a spring member 55 in which the ground wire A3 and the drain wire are connected by a conducting wire at the −X side end of the cable 40 is used.

  Then, a part of the spring member 55 is embedded, and a resin block 45 having two through holes is attached by molding.

  In this case, the camera casing is made of metal, and as shown in FIG. 35, when the cable 40 is attached to the in-vehicle camera 20, only the -X side end of the cable 40 is inserted into the camera casing. Thus, the spring member 55 and the rear case 22B come into contact with each other. That is, the rear case 22B, the shield material F, the ground line A3, and the ground terminal of the circuit board through the filter can be easily electrically connected.

  Moreover, although the said embodiment demonstrated the case where the insulated wire was pulled out from the cable end, if an insulated wire and FPC are connected within the resin block and it draws out by FPC, it will be wiring routing space There is an advantage that can be reduced.

  In the above embodiment, the case where a plurality of lens groups are held by the front case has been described. However, the present invention is not limited to this. For example, the plurality of lens groups are held by a lens barrel, and the lens barrel is the front case. It may be attached to.

  As described above, the camera unit of the present invention is suitable for providing high resistance against static electricity and excellent shielding properties against electromagnetic waves without causing an increase in cost. In addition, the sensing device of the present invention is suitable for improving reliability without incurring an increase in cost.

  DESCRIPTION OF SYMBOLS 10 ... Back monitor apparatus (sensing apparatus), 20 ... Car-mounted camera (a part of camera unit), 21 ... Lens system, 24 ... CMOS image sensor, 25 ... Circuit board, 26 ... Shield board (shield member), 32 ... Display 33, main controller (part of the supervisory controller), 34 ... memory, 35 ... voice / alarm generator (part of the supervisory controller), 40 ... cable, A1 ... analog signal line (conductor for signal) ), A3... Ground wire (ground conductor), F... Shield material (earth conductor).

JP 2005-347243 A Japanese Patent No. 3802742

The present invention relates to a camera unit, and more particularly, relates to a camera unit for outputting an image signal.

The present invention has been made under such circumstances, purpose of that without causing high cost, has high resistance to static electricity, provide superior camera unit to electromagnetic wave shielding property There is.

The present invention includes a Lee Mejisensa, a circuit board on which a circuit including a processing circuit is formed for processing signals from the image sensor includes a conductor for the conductor and ground for signal, wherein the end portion of the one side A cable connected to the circuit board; and a shield member that covers the circuit board. The shield member has an opening into which the cable is inserted, and the cable is inserted into the opening. Accordingly, the camera unit is characterized in that the grounding conductor and the shield member are electrically connected .

As described above, the camera unit of the present invention is suitable for providing high resistance against static electricity and excellent shielding properties against electromagnetic waves without causing an increase in cost .

Claims (12)

An image sensor;
A circuit board on which a circuit including a processing circuit for processing a signal from the image sensor is formed;
A cable including a signal conductor and a ground conductor, one end of which is connected to the circuit board;
A shield member covering the circuit board,
The camera unit, wherein the grounding conductor is connected to a ground terminal of the circuit board and the shield member in the vicinity of one end of the cable.   The camera unit according to claim 1, wherein the grounding conductor is connected to the shield member via a metal member. The metal member is fixed in the vicinity of one end of the cable in a state of being connected to the conductor for grounding,
The camera unit according to claim 2, wherein the metal member has a contact portion that contacts the shield member when the cable is connected to the circuit board. The metal member is fixed in the vicinity of one end of the cable in a state of being connected to the conductor for grounding,
The camera unit according to claim 2, wherein the shield member has a contact portion that contacts the metal member when the cable is connected to the circuit board.   The metal member has a cap-shaped outer shape that covers one end of the cable, and an opening through which the signal conductor and the ground conductor pass is formed on a bottom surface thereof. The camera unit according to any one of claims 2 to 4. The cable further includes a ground conductor,
The camera unit according to claim 1, wherein the grounding conductor is connected to the grounding conductor in the vicinity of one end of the cable.   The camera unit according to claim 1, wherein the image sensor is a lens-integrated image sensor.   The camera unit according to claim 1, wherein the image sensor is a CMOS image sensor.   The camera unit according to claim 1, wherein the image sensor is a CCD image sensor. At least one camera unit according to any one of claims 1 to 9;
And a display device that displays information from the at least one camera unit.   The sensing device according to claim 10, further comprising a memory that stores information from the at least one camera unit. Mounted on the vehicle,
12. The sensing device according to claim 10, further comprising a monitoring control device that outputs alarm information when it is determined that there is a risk based on information from the at least one camera unit.