JP2016070927A - Monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device that can be reduced in size.SOLUTION: There is provided a monitoring device including an imaging optical system directed forward, imaging element, antenna member, first circuit board, waveguide, upper case, circuit part for information processing, second circuit board, connector, and power source circuit part, where the connector is arranged behind the imaging optical system; the power source circuit part includes at least one capacitor; the at least one capacitor of capacitors having the maximum inner height is arranged behind the imaging optical system.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a monitoring device.

  2. Description of the Related Art In recent years, devices that use radar signals and image information obtained from an imaging device have been developed as monitoring devices for monitoring the front or rear of a vehicle. In such a device, the imaging device is disposed in the vehicle interior, whereas the radar is often disposed at the tip portion outside the vehicle interior of the vehicle.

  On the other hand, for example, Patent Literature 1 discloses a monitoring device that is disposed in a vehicle interior and includes both a radar and an imaging device. Such a device eliminates the need for waterproofing measures for the radar. Also, the assembly process to the automobile is simplified.

Re-publication WO2006 / 035510

  It is difficult to downsize an apparatus equipped with both a radar having a radar wave transmission / reception antenna and an imaging apparatus having an imaging optical system and an imaging element. Patent Document 1 discloses a configuration in which a radar and an imaging device are arranged side by side, but the width is increased. In many cases, the arrangement of the monitoring device attached to the upper part of the windshield is selected.

  The present invention has been made in view of the above points, and an object thereof is to provide a miniaturized monitoring apparatus.

  In order to solve the above-described problem, a monitoring apparatus according to an exemplary embodiment of the present invention includes an imaging optical system facing forward, an imaging element disposed at a focal position of the imaging optical system, An antenna member having an antenna in which a lobe extends forward, a high-frequency circuit unit, a first circuit board on which the high-frequency circuit unit is mounted, and a waveguide that connects the output end of the high-frequency circuit unit and the antenna. A tube, an upper case positioned above the antenna member and having a flat portion, an information processing circuit portion, a second circuit board on which the information processing circuit portion is mounted, the high-frequency circuit portion, and the information A high-frequency circuit signal line connecting the processing circuit unit, an image signal line connecting the imaging device and the information processing circuit unit, a connector electrically connected to the second circuit board, and the information processing Circuit section and the high frequency circuit A power supply circuit section for supplying DC power to the road section, and the flat section of the upper case is inclined in a direction approaching the central axis of the main lobe of the antenna member as it advances forward, and the second circuit board Is disposed between the upper case and the antenna member, and the upper case has a field window which is a cutout or a hole in the middle or rear of the flat portion, and the optical axis of the imaging optical system is the field window The imaging optical system is fixed to the upper case, the flat portion is located below the field of view of the imaging optical system, the connector is disposed behind the imaging optical system, and the power supply The circuit unit includes at least one capacitor, and the capacitor having the maximum inner height of the at least one capacitor is disposed behind the imaging optical system.

  According to an exemplary embodiment of the present invention, a monitoring device that can be reduced in size can be obtained.

FIG. 1 is a perspective view illustrating an external configuration of a monitoring apparatus according to an embodiment. FIG. 2 is a schematic cross-sectional view of a monitoring device according to an embodiment. FIG. 3 is a perspective view showing a state in which the upper case and the front cover are removed in the monitoring device of the first embodiment. FIG. 4 is a circuit diagram of a power supply circuit unit in the monitoring apparatus according to the embodiment. FIG. 5 is an exploded view of the monitoring device according to the embodiment. FIG. 6 is a schematic cross-sectional view showing the relationship between the first type horn or the second type horn and the front cover in the monitoring device of one embodiment. FIG. 7 is a diagram illustrating a monitoring device according to an embodiment including a lower case.

Hereinafter, embodiments will be described with reference to the drawings.
In the drawings used in the following description, for the purpose of emphasizing the feature portion, the feature portion may be shown in an enlarged manner for convenience, and the dimensional ratios of the respective constituent elements are not always the same as in practice. Absent. In addition, for the same purpose, portions that are not characteristic may be omitted from illustration.
Each figure shows an XYZ coordinate system. In the following description, each direction will be described based on each coordinate system as necessary.

The monitoring device 100 according to the present embodiment is a device that emits a millimeter wave radar wave, for example. The monitoring device 100 is attached, for example, facing the front (or rear) of the vehicle, and detects an object in front (or rear) of the vehicle.
FIG. 1 is a perspective view illustrating an external configuration of a monitoring apparatus 100 according to the present embodiment. In FIG. 1, a front cover (cover) 90 is indicated by a one-dot chain line for explanation of each part.
FIG. 2 is a schematic cross-sectional view of the monitoring device 100. Note that FIG. 2 is a diagram schematically showing, for example, a partially enlarged view for explaining each part. Further, FIG. 2 is not a cross section along one plane, but is a cross sectional view showing an appropriate selection of a cross section along an appropriate plane passing through the portion in order to easily show the portion to be described.

As shown in FIGS. 1 and 2, the monitoring device 100 includes an antenna member 10, a feed member 30, a first circuit board 40, a second circuit board 50, an imaging device 70, and an upper case 80. And a front cover (cover) 90.
The antenna member 10 includes a first type horn 11 and a second type horn 21. The feed member 30 is attached to the upper surface 10 a of the antenna member 10. The first circuit board 40 is attached to the upper surface 30 a of the feed member 30. The second circuit board 50 is located above the first circuit board 40 and is connected to the first circuit board 40 by a high frequency circuit signal line 61. The imaging device 70 is located above the second circuit board 50. The upper case 80 covers the antenna member 10 from above and covers each component arranged on the antenna member 10. The front cover 90 covers the front of the antenna member 10.
Further, the antenna member 10 and the feed member 30 constitute a feed unit 5. The feed unit 5 includes a first type waveguide 8 and a second type waveguide 9. For the parts related to the first type horn and the second type horn, as described above, “first type (part name)” or “second type (part name)” as described above. Express.

  The monitoring device 100 transmits a radar wave (high-frequency electromagnetic wave) output from the second type high-frequency circuit unit 42 mounted on the first circuit board 40 through the second type waveguide 9 and transmits the second wave of the antenna member 10. Radiates from the seed horn 21. In addition, the monitoring device 100 receives the radar wave reflected on the detection target by the first type horn 11, transmits the radar wave through the first type waveguide 8, and is mounted on the first circuit board 40. Is received by the high-frequency circuit unit 41.

In the following description, the antenna member 10 transmits a radar wave, and the + Y direction in FIG. 1 is the front and the −Y direction is the rear. Furthermore, facing forward (+ Y direction), a right direction (+ X direction), a left direction (−X direction), an upward direction (+ Z direction), and a downward direction (−Z direction) are determined.
Each direction does not necessarily represent the direction when the monitoring apparatus 100 of the present embodiment is mounted on the vehicle. Therefore, for example, the monitoring device 100 can be assembled to a vehicle in a state where the monitoring device 100 is turned upside down.
Further, “front” in the present specification means a direction monitored by the monitoring apparatus 100. It does not mean the front of an automobile or the like to which the monitoring device 100 is attached. The monitoring device 100 can be attached toward the rear of the automobile. In this case, the monitoring direction of the monitoring device 100 is behind the automobile.
Hereinafter, each configuration of the monitoring apparatus 100 will be described in detail.

<Antenna member>
As shown in FIG. 1, the monitoring apparatus 100 includes an antenna member having an antenna (a first type horn 11 and a second type horn 21) with a main lobe extending forward.
The antenna member 10 includes five first type horns (antennas) 11 that are adjacent to each other in the width direction (X-axis direction) and form a row in the width direction, and right and left of the row of the first type horns (antennas) 11. Two horns 21 of the second kind located at the ends of the two. The five first-type horns 11 and the two second-type horns all face the same direction. That is, when the direction in which one of the first type horns 11 is directed forward is assumed, the direction in which the other first type horn 11 and the second type horn 21 are directed is also forward.
The antenna member 10 is made of, for example, an aluminum alloy and is preferably manufactured by die casting. The antenna member 10 can radiate or receive microwaves including millimeter waves.

In general, a horn refers to a cylindrical member that spreads toward the end, but is used with a slightly different meaning in the present specification. Since the present invention pays attention to a hollow portion where radio waves are transmitted, the hollow portion is referred to as a horn. Therefore, for example, when one block-shaped member has three diverging cavities, the one member has three horns. Also, when three end-expanding tubes are bundled, there are three horns.
In more detail, the horn is a cavity extending from the base toward the aperture, and the cross-sectional area of the cavity in a plane perpendicular to the direction in which the cavity extends is continuously from the base toward the aperture. Expanding. However, as long as the region has a length equal to or shorter than the wavelength, a part where the cross-sectional area is partially constant or reduced may be included.
In the present embodiment, a pyramidal horn is particularly used as the first type horn 11 and the second type horn 21. The aperture of the horn is sometimes expressed as opening, but in this specification, the expression aperture is used for the radio wave emission port of the horn. The word opening is used to describe a hole or hole that opens in a member other than the horn.
In the text or in the claims, when referring to the orientation of the horn, it means the orientation when looking through the aperture side from the base of the horn.
In general, an antenna often refers to the entire device that receives or transmits electromagnetic waves. However, in this specification, a portion that radiates electromagnetic waves transmitted from a waveguide to the outside or a portion that transmits electromagnetic waves from the outside to the waveguide is referred to as an antenna. In particular, the antenna in the present embodiment refers to a horn (first type horn 11 or second type horn 21) as a cavity extending from the base toward the aperture.

The first type horn 11 functions as a part of an antenna for receiving radar waves.
As shown in FIG. 2, the first type horn 11 is a pyramid horn having a pyramid shape that gradually spreads from the base 12 to the aperture 13. The length from the base 12 of the first type horn 11 to the aperture 13 is the first type length L1.

  The apertures 13 of the five first type horns 11 are arranged on the same plane in the front-rear direction. Further, since the five first-type horns 11 have the same first-type length L1, the respective base portions 12 are arranged on the same surface in the front-rear direction.

  The first type horn 11 includes a steep slope portion 11b located on the base 12 side along the length direction, and a gentle slope portion 11a located on the aperture 13 side from the steep slope portion 11b. The steep slope portion 11b has a larger inclination angle with respect to the length direction of the first type horn 11 than the gentle slope portion 11a. The steep slope portion 11b is provided in a region that is sufficiently small with respect to the first type length L1 of the first type horn 11.

  As shown in FIG. 1, the apertures 13 of the five first type horns 11 have the same shape. That is, the apertures 13 of the five first-type horns 11 have the same first-type height H1. Further, the apertures 13 of the five first type horns 11 have the first type width W1 having the same width. The aperture 13 has a vertically long rectangular cross-sectional shape in which the first type height H1 is larger than the first type width W1.

  Five first-type horns 11 are provided in the width direction, and the reception performance of the radar wave is enhanced by complementing each other. The number of first type horns 11 is not limited to five and may be one or more. Further, the number of first type horns is preferably three or more, thereby ensuring reception performance. In addition, since the first type horn 11 is provided side by side in the width direction, the overall height of the monitoring device 100 can be reduced.

The second type horn 21 functions as a part of an antenna for radar wave transmission.
As shown in FIG. 1, the second type horns 21 are located on the left and right sides of the row of the first type horns 11, respectively. When the second type horns 21 positioned on the left and right sides are described separately, the horn located on the right side (+ X side) of the row of the first type horns 11 is the right end horn 21R, and the left side (−X side). The horn located at the left is the left end horn 21L.

As shown in FIG. 2, the second type horn 21 is a pyramid horn having a pyramid shape that gradually spreads from the base 22 to the aperture 23. The length from the base 22 to the aperture 23 of the second type horn 21 is represented by the second type length L2. Note that the right end horn 21R and the left end horn 21L may have different lengths, but here, the description will be made assuming that the second type length L2 has the same length.
Further, the second type length L2 of the second type horn 21 is larger than the first type length L1 of the first type horn 11.

  The second type horn 21 has a steep slope portion 21b located on the base 22 side along the length direction, and a gentle slope portion 21a located on the aperture 23 side from the steep slope portion 21b. The steep slope portion 21b has a larger inclination angle with respect to the length direction of the second type horn 21 than the gentle slope portion 21a. Further, the steep slope portion 21b is provided in a region that is sufficiently small with respect to the first type length L2 of the second type horn 21.

As shown in FIG. 1, the aperture 23R of the right end horn 21R and the aperture 23L of the left end horn 21L have the same height H2 of the second type. The second type height H2 is the same as the first type height H1.
The width W2R of the aperture 23R of the right end horn 21R is smaller than the width W2L of the aperture 23L of the left end horn 21L. The aperture 23R of the right end horn 21R has a vertically-long rectangular cross section having a height H2 larger than the width W2R. On the other hand, the aperture 23L of the left end horn 21L has a cross-sectional shape close to a square having a width W2L and a height H2 that are substantially the same.

  The elevation angle (elevation angle or depression angle) may be different between the orientation of the right end horn 21R and the orientation of the left end horn 21L. For example, the orientation that the right end horn 21R faces may be directed downward as compared to the orientation that the left end horn 21L faces. In this case, the right end horn 21R detects the object by transmitting a radar wave toward an object located on a road relatively close to the vehicle on which the monitoring device 100 is mounted. On the other hand, the left end horn 21L detects an object located on a distant road of the vehicle, a relatively tall object, and the like.

The apertures 23 of the two second-type horns 21 are arranged on the same plane in the front-rear direction.
In the present embodiment, the aperture 23 of the second type horn 21 and the aperture 13 of the first type horn 11 are disposed on the same plane in the front-rear direction.

As shown in FIG. 2, the antenna member 10 has a first type lower hole 14 extending vertically upward from the base 12 of each first type horn 11 with respect to the orientation of the first type horn 11. Is provided. Five first type lower holes 14 are provided corresponding to the five first type horns 11, respectively. The first type lower hole 14 forms an opening 14 a in the upper surface 10 a of the antenna member 10.
Similarly, the antenna member 10 is provided with a second type lower hole 24 that extends vertically upward from the base 22 of the second type horn 21 with respect to the orientation of the second type horn 21. Two second-type lower holes 24 are provided corresponding to the two second-type horns 21 respectively. The second type lower hole 24 forms an opening 24 a in the upper surface 10 a of the antenna member 10.
The upper surface 10 a of the antenna member 10 is substantially parallel to the width direction and the length direction of the first type horn 11 and the second type horn 21. The upper surface 10 a is substantially perpendicular to the first type lower hole 14 and the second type lower hole 24.

The upper surface 10a of the antenna member 10 is provided with a first type lower groove 15 continuous from the opening 14a of the first type lower hole 14. Further, the upper surface 10 a of the antenna member 10 is provided with a second type lower groove 25 that continues from the opening 24 a of the second type lower hole 24. Five first-type lower grooves 15 are provided corresponding to the respective first-type lower holes 14. Two second-type lower grooves 25 are provided corresponding to the respective second-type lower holes 24.
The first type lower groove 15 constitutes a part of the first type waveguide 8 together with the first type upper groove 31 of the feed member 30 described later. The second type lower groove 25 forms part of the second type waveguide 9 together with the second type upper groove 32 of the feed member 30.

<Feed member>
As shown in FIG. 2, the feed member 30 is attached to the upper surface 10 a behind the antenna member 10. The feed member 30 has a block shape or a plate shape, is preferably made of an aluminum alloy, and can be manufactured by die casting or cutting. The feed member 30 has a lower surface 30b located on the lower side and an upper surface 30a located on the upper side. The upper surface 30a and the lower surface 30b are not parallel to each other, and the upper surface 30a is inclined forward with the lower surface 30b being horizontal.

  The feed member 30 is provided with five first-type upper holes 33 and two second-type upper holes 34. The first type upper hole 33 and the second type upper hole 34 penetrate the upper surface 30 a and the lower surface 30 b of the feed member 30. The first type upper hole 33 and the second type upper hole 34 are provided perpendicular to the upper surface 30a.

A first type upper groove 31 extending from the opening 33 b of the first type upper hole 33 is provided on the lower surface 30 b of the feed member 30. The lower surface 30b of the feed member 30 is provided with a second type upper groove 32 extending from the opening 34b of the second type upper hole 34.
The feed member 30 is in contact with the upper surface 10a of the antenna member 10 at the lower surface 30b. The first type lower groove 15 provided on the upper surface 10 a of the antenna member 10 faces the first type upper groove 31 provided on the lower surface 30 b of the feed member 30. The first type lower groove 15 and the first type upper groove 31 are mirror-symmetrical to each other. As shown in FIG. 2, the first-type lower groove 15 and the first-type upper groove 31 face each other and overlap each other, thereby forming a tunnel-type first-type relay at the boundary between the feed member 30 and the antenna member 10. Hole 6 is formed.
Similarly, the second type lower groove 25 and the second type upper groove 32 have a mirror-symmetric shape. The second type lower groove 25 and the second type upper groove 32 face each other and overlap each other to constitute the second type relay hole 7.

  On the upper surface 30 a of the feed member 30, an opening 33 a of the first type upper hole 33 and an opening 34 a of the second type upper hole 34 are located. A recess 35 is provided on the upper surface 30 a of the feed member 30. The recess 35 is connected to the opening 33a and the opening 34a. The recess 35 has a substantially similar shape that is slightly larger than the high-frequency circuit region 45 of the first circuit board 40 described later.

<First circuit board>
As shown in FIG. 2, the monitoring apparatus 100 includes a high-frequency circuit unit (the first type high-frequency circuit unit 41 and the second type high-frequency circuit unit 42) and a high-frequency circuit unit (the first type high-frequency circuit unit 41 and the first type high-frequency circuit unit 41). And a first circuit board 40 on which two types of high-frequency circuit sections 42) are mounted. Further, the monitoring device 100 includes an output terminal of the high frequency circuit unit (the first type high frequency circuit unit 41 and the second type high frequency circuit unit 42) and an antenna (the first type horn 11 and the second type horn 21). And waveguides to be connected (first type waveguide 8 and second type waveguide 9).

The first circuit board 40 is fixed to the upper surface 30 a of the feed member 30. Thereby, the board surface of the 1st circuit board 40 is arrange | positioned with the breadth in the direction where the 1st type horn 11 and the 2nd type horn 21 are extended, and the width direction.
The first circuit board 40 and the feed member 30 are provided with fixing holes (not shown). The antenna member 10 is provided with a screw hole (not shown). The first circuit board 40 and the feed member 30 are fixed by inserting a fixing hole of the first circuit board 40 and a screw (not shown) passed through the fixing hole of the feed member 30 into the screw hole of the antenna member 10. Do that.

  In the present embodiment, the first circuit board 40 and the feed member 30 are arranged on the upper side of the antenna member 10. However, the first circuit board 40 and the feed member 30 may be disposed below the antenna member 10.

  On the first circuit board 40, a first type high frequency circuit unit 41 for receiving radar waves and a second type high frequency circuit unit 42 for transmitting radar waves are mounted.

The first type of high-frequency circuit unit 41 includes a high-frequency integrated circuit 41a and five transmission lines (microstrip lines) 41c extending from the high-frequency integrated circuit 41a and having reception ends 41b at the leading ends.
The second type high frequency circuit section 42 includes a high frequency integrated circuit 42a and two transmission lines (microstrip lines) 42c extending from the high frequency integrated circuit 42a and having transmission ends 42b at the leading ends.

As shown in FIG. 2, the receiving end 41 b of the first type high-frequency circuit unit 41 is located above the opening 33 a of the first type upper hole 33 of the feed member 30. The electromagnetic wave transmitted from the first type upper hole 33 is received by the receiving end 41b.
Similarly, the transmission end 42 b of the second type high-frequency circuit unit 42 is located above the opening 34 a of the second type upper hole 34 of the feed member 30. The electromagnetic wave transmitted from the high frequency integrated circuit 42a is transmitted from the transmitting end 42b to the second type upper hole 34.

<Feed part>
Next, the feed unit 5 having the first type waveguide 8 and the second type waveguide 9 which are transmission paths of the radar waves to be transmitted and received and including the antenna member 10 and the feed member 30 will be described. .
The feed unit 5 includes a feed member 30 including an upper surface 30a and a lower surface 30b, and an antenna member 10 including an upper surface 10a. The feed unit 5 includes five first-type waveguides 8 that transmit reception radar waves and two second-type waveguides 9 that transmit transmission radar waves.
The feed unit 5 covers the first type high frequency circuit unit 41 and the second type high frequency circuit unit 42 on the upper surface 30 a of the feed member 30.

  The first type waveguide 8 includes a first type lower hole 14, a first type relay hole 6, and a first type upper hole 33. The second type waveguide 9 includes a second type lower hole 24, a second type relay hole 7, and a second type upper hole 34. The first-type waveguide 8 and the second-type waveguide 9 are paths inclined forward in the first-type upper hole 33 and the second-type upper hole 34 provided in the feed member 30. ing.

  The first type waveguide 8 is connected to the base 12 of the first type horn 11 at one end. Further, the first type waveguide 8 is opened on the other receiving end 41b of the first type high frequency circuit section 41 at the other end. The first type waveguide 8 transmits the radar wave received by the first type horn 11 to the receiving end 41b.

  The second type waveguide 9 is connected to the base portion 22 of the second type horn 21 at one end. Further, the second type waveguide 9 is opened at the other end on a different transmission end 42b of the second type high-frequency circuit unit 42, respectively. The second type waveguide 9 transmits the radar wave transmitted from the transmission end 42 b to the base 22 of the second type horn 21.

  The feed unit 5 includes a first type relay hole 6 of the first type waveguide 8 and a second type relay hole 7 of the second type waveguide 9 between the antenna member 10 and the feed member 30. And configure. The first type relay hole 6 and the second type relay hole 7 are located on a plane (a plane parallel to the XY plane) in a direction substantially orthogonal to the height direction (Z direction). Therefore, the first-type relay hole 6 and the second-type relay hole 7 are different from the first-type waveguide 8 and the second-type waveguide 9 in the width direction (X direction) and the length direction ( (Y direction). Accordingly, the positions of the opening 33 a of the first type waveguide 8 and the opening 34 a of the second type waveguide 9 can be appropriately arranged according to the configuration of the first circuit board 40. That is, the configuration of the receiving end 41b of the first type high frequency circuit unit 41 and the transmitting end 42b of the second type high frequency circuit unit 42 of the first circuit board 40 can be simplified, and the cost can be reduced.

<Second circuit board>
FIG. 3 is a perspective view showing a state where the upper case 80 and the front cover 90 are removed.
As shown in FIGS. 2 and 3, the monitoring apparatus 100 includes an information processing circuit unit 59, a second circuit board 50 on which the information processing circuit unit 59 is mounted, and a high frequency circuit unit (first type of high frequency signal). A high frequency circuit signal line 61 connecting the circuit unit 41 and the second type high frequency circuit unit 42) and the information processing circuit unit 59, an image signal line 60 connecting the image sensor 72 and the information processing circuit unit 59, and a second. DC power is supplied to the connector 51 electrically connected to the circuit board 50, the information processing circuit section 59, and the high frequency circuit section (the first type high frequency circuit section 41 and the second type high frequency circuit section 42). And a power supply circuit unit 58.

The second circuit board 50 is provided above the first circuit board 40 and substantially parallel to the first circuit board 40. The second circuit board 50 is disposed between the upper case 80 and the antenna member 10.
A power circuit unit 58 and an information processing circuit unit 59 are mounted on the second circuit board 50.
The power supply circuit unit 58 supplies a direct current to the information processing circuit unit 59, the first type high frequency circuit unit 41 and the second type high frequency circuit unit 42 of the first circuit board 40, and the imaging device 70.
The information processing circuit unit 59 is connected to the first type high frequency circuit unit 41 and the second type high frequency circuit unit 42 by a high frequency circuit signal line 61. The information processing circuit unit 59 processes high frequency circuit signal information of the first type high frequency circuit unit 41 and the second type high frequency circuit unit 42. More specifically, the information processing circuit unit 59 instructs the second type high frequency circuit unit 42 to transmit a radar wave via the high frequency circuit signal line 61. In addition, the information processing circuit unit 59 calculates the upper part of the radar wave received by the first type high frequency circuit unit 41 via the high frequency circuit signal line 61, and estimates the distance, direction, etc. of the object. Further, the information processing circuit unit 59 is connected to the image sensor 72 of the imaging device 70 via the image signal line 60 and the substrate 73. The information processing circuit unit 59 processes an imaging signal of the imaging device 70.

    In the second circuit board 50, the power supply circuit unit 58 includes at least one capacitor, and the capacitor C 1 a having the maximum inner height of at least one capacitor is arranged behind the imaging optical system 71. .

FIG. 4 shows a circuit diagram of the power supply circuit unit 58.
As shown in FIG. 4, the power supply circuit unit 58 includes an input terminal In1, an input terminal In2, a power supply line VL, a ground line GL, an output terminal out1, an output terminal out2, and an output terminal out3. The power supply line VL includes a line L1, a line L2, a line L3, a line L4, and a line L5. The ground line GL includes a ground line GL1 and a ground line GL2.
The power circuit 58 further includes a diode D, a Zener diode ZD, a regulator REG1, a regulator REG2, a capacitor C1a, a capacitor C1b, a capacitor C2a, a capacitor C2b, a capacitor C3a, and a capacitor C3b. Have.

  The diode D and the Zener diode ZD constitute a protection circuit unit 58a. The protection circuit unit 58a is located between the input terminal In1 and the input terminal In2 and the terminal T1 and the terminal T2. The protection circuit unit 58a aims at circuit protection when the positive electrode Vp and the negative electrode Vn of the external power source are reversely connected, surge protection, and the like. Note that the reverse connection means a state in which the negative terminal Vn of the external power source V is connected to the input terminal In1 and the positive terminal Vp is connected to the input terminal In2.

  The regulator REG1, the regulator REG2, the capacitor C1a, the capacitor C1b, the capacitor C2a, the capacitor C2b, the capacitor C3a, and the capacitor C3b constitute a power supply stabilizing unit 58b. The power supply stabilizing unit 58b is located between the terminal T1 and the terminal T2 and the output terminal out1, the output terminal out2, and the output terminal out3. The power supply stabilization unit 58b aims to suppress voltage fluctuations of the power supply and to suppress a decrease in output voltage when the external power supply is momentarily interrupted.

A DC voltage of 12V is applied between the power supply line VL and the ground line GL by the external power supply V.
The diode D has an anode DA connected to the line L1 on the input terminal In1 side and a cathode DK connected to the line L2 on the opposite side of the input terminal In1. The diode D allows current to flow from the anode DA to the cathode DK, and prevents current from flowing from the cathode DK to the anode DA. The diode D prevents the reverse voltage from being applied to the circuit to which power is supplied when the positive and negative electrodes of the external power supply V are connected in reverse.

  The zener diode ZD is connected so as to be reverse-biased between the line L1 and the ground line GL1. The Zener diode ZD has a cathode ZDK connected to the line L1 side and an anode ZDA connected to the ground line GL1 side. The Zener diode ZD causes a current to flow from the cathode ZDK to the anode ZDA when the voltage of the cathode ZDK with respect to the anode ZDA exceeds the breakdown voltage of the Zener diode ZD. Therefore, the Zener diode ZD causes a current to flow from the power supply line VL to the ground line GL when the voltage between the power supply line VL and the ground line GL becomes excessive. Accordingly, the Zener diode ZD suppresses application of an excessive voltage to the power supply stabilization unit 58b when an excessive voltage is applied from the external power supply V.

The regulator REG1 is provided between the line L3 and the line L4. The regulator REG2 is provided between the line L3 and the line L5.
The regulator REG1 and the regulator REG2 serve to keep the output voltage constant by dropping the input predetermined voltage. The regulator REG1 drops the voltage applied from the power supply line VL, and outputs a power supply voltage of 5 V, for example, from the output terminal out1. The regulator REG2 drops the voltage applied from the power supply line VL and outputs a power supply voltage of 3.3 V, for example, from the output terminal out2.

The capacitor C1a, the capacitor C1b, the capacitor C2a, the capacitor C2b, the capacitor C3a, and the capacitor C3b function as a power supply stabilization capacitor for making the supplied voltage constant.
A general power supply causes voltage fluctuation when a circuit that is a power supply destination instantaneously consumes a large current and a current that can be supplied is insufficient. The power supply stabilizing capacitor plays a role of compensating the current that the supply power supply is insufficient to stabilize the voltage. The power stabilization capacitor is charged with a normal power supply voltage while the power supply destination circuit does not require a large current. The power stabilization capacitor stabilizes the voltage supplied by discharging the stored charge at the moment when the circuit to which the power is supplied requires a large current. Furthermore, the power source stabilization capacitor discharges the electric charge stored when the external power source is momentarily interrupted, and serves to maintain the voltage for a certain period of time.

The capacitor C1a, the capacitor C2a, and the capacitor C3a are electrolytic capacitors. Further, the capacitor C1b, the capacitor C2b, and the capacitor C3b are ceramic capacitors. In the present embodiment, an electrolytic capacitor and a ceramic capacitor are provided in parallel as a set. The capacitor C1a and the capacitor C1b are provided in parallel so as to straddle the line L3 and the ground line GL2. The capacitor C2a and the capacitor C2b are provided in parallel so as to straddle the line L5 and the ground line GL2. The capacitor C3a and the capacitor C3b are provided in parallel so as to straddle the line L4 and the ground line GL2.
An electrolytic capacitor is a capacitor having a relatively large capacitance. Electrolytic capacitors play a major role in the low frequency components of power supply voltage fluctuations. On the other hand, a ceramic capacitor is a capacitor having a relatively small capacitance. Ceramic capacitors play a major role in high-frequency components because of their high responsiveness. By providing the electrolytic capacitor and the ceramic capacitor in parallel as a set, voltage fluctuations can be prevented over a wide frequency band.

  The power circuit 58 of the second circuit board 50 includes the diode D, the Zener diode ZD, the regulator REG1, the regulator REG2, the capacitor C1a, the capacitor C1b, the capacitor C2a, and the capacitor C2b. In addition to the capacitor C3a and the capacitor C3b, a connector 51 (see FIG. 3) to which an external terminal is connected is mounted.

As shown in FIG. 3, the connector 51, the capacitor C1a, the capacitor C2a, the capacitor C3a, and the Zener diode ZD are components that are large in the height direction as mounted components.
Capacitors C1a, C2a, and C3a, which are electrolytic capacitors, are large in the height direction in order to ensure sufficient capacity. Among these, in particular, the capacitor C1a provided between the line L3 and the ground line GL2 needs to store a charge corresponding to a potential difference of 12 V in preparation for an external power supply interruption. Therefore, the capacitor C1a requires the largest capacitance and has the maximum height. The height of the capacitor C1a is about 10 mm as an example. Moreover, the height of the capacitor | condenser C2a and the capacitor | condenser C3a is about 8 mm as an example.
A Zener diode ZD having a large height is used in order to have a sufficient breakdown voltage. As an example, the height of the Zener diode ZD is about 4 mm.
The height of the connector 51 is about 12 mm as an example.

  The connector 51, the capacitor C1a, the capacitor C2a, the capacitor C3a, and the Zener diode ZD are located behind the second circuit board 50 and behind the imaging device 70. As shown in FIG. 2, the monitoring device 100 includes an antenna member 10 whose height gradually decreases from the front toward the rear. As a result, the connector 51, the capacitor C1a, the capacitor C2a, the capacitor C3a, and the Zener diode ZD having a large height are arranged in the low portion of the antenna member 10. Therefore, the height of the monitoring device 100 can be averaged to prevent a local increase in height.

  In addition, by arranging the connector 51, the capacitor C1a, the capacitor C2a, the capacitor C3a, and the Zener diode ZD at the rear, the visual field of the imaging device 70 is not hindered by tall components. Accordingly, the imaging device 70 can be disposed close to the second circuit board 50. Thereby, the monitoring apparatus 100 can comprise a height dimension small.

<Imaging device>
As illustrated in FIG. 3, the monitoring device 100 includes an imaging device 70. The imaging device 70 includes an imaging optical system assembly 75, an imaging element 72, and a substrate 73. The imaging optical system assembly 75 includes an imaging optical system 71 having an optical axis L facing forward, and a lens holding member 74 that holds the imaging optical system 71. That is, the monitoring apparatus 100 includes an imaging optical system 71 facing forward and an imaging element 72 disposed at the focal position of the imaging optical system 71.

The imaging optical system 71 faces forward. The optical axis L of the imaging optical system 71 passes through the field window 81 of the upper case 80. The imaging optical system 71 has a configuration in which, for example, a plurality of lenses having the same optical axis are combined.
The lens holding member 74 is made of, for example, a resin material and has a main body portion 74c having a substantially rectangular block shape and a pair of flange portions 74a. The lens holding member 74 holds the imaging optical system 71 in the main body portion 74c.
The flange portion 74a protrudes forward from the main body portion 74c. The flange portion 74a is provided with a hole 74b penetrating in the vertical direction.
The image sensor 72 is disposed at the focal position of the imaging optical system 71. The image pickup device 72 is a solid-state image pickup device such as a CCD image sensor or a CMOS image sensor, and picks up a subject image formed through the image forming optical system 71.
An image sensor 72 is mounted on the substrate 73. The substrate 73 is fixed to the lens holding member 74 of the imaging optical system assembly 75. The substrate 73 is connected to the second circuit substrate 50 by the image signal line 60.
The imaging device 70 is controlled by the control circuit of the second circuit board 50 and is supplied with power from the second circuit board 50.

<Upper case>
As shown in FIG. 1, the monitoring device 100 includes an upper case that is located above the antenna member 10 and has a flat portion (front upper surface 83).
The upper case 80 has a rear upper surface 82 and a front upper surface (flat portion) 83 positioned at the upper portion, a pair of side surfaces 84 positioned at the side portions, and a rear surface 85 positioned at the rear portion.
The upper case 80 is fixed to the antenna member 10 with screws. The upper case 80 and the antenna member 10 may be fixed by other methods.

  The upper case 80 has an opening 87 in the front, and the aperture 13 of the first type horn 11 and the aperture 13 of the second type horn 21 of the antenna member 10 are exposed forward from the opening 87. . A front cover 90 is provided in the opening 87 and covers the aperture 13 and the aperture 23.

  As shown in FIG. 2, the rear upper surface 82 is positioned one step above the front upper surface 83 and the stepped portion 86. Below the rear upper surface 82, a connector 51, a capacitor C1a, a capacitor C2a, a capacitor C3a, and a Zener diode ZD mounted on the imaging device 70 and the second circuit board 50 are arranged.

  The upper case 80 has a viewing window 81 that is a cutout or a hole in the middle or rear of the front upper surface (flat portion) 83. The optical axis L of the imaging optical system 71 passes through the field window 81. In the present embodiment, a visual field window 81 is provided at the center in the width direction of the stepped portion 86 of the upper case 80. The field window 81 is provided to ensure the field of view of the imaging device 70. The viewing window 81 may be fitted with a transparent plate.

  The front upper surface (flat portion) 83 of the upper case 80 is inclined in a direction approaching the central axis of the main lobe of the antenna member 10 as it advances forward. The front upper surface (flat portion) 83 is located below the field of view of the imaging optical system 71.

  The front upper surface 83 is arranged so as to cover the lower part of the field of view of the imaging device 70, thereby blocking the light traveling from the lower side of the monitoring device 100 toward the imaging device 70 and suppressing entering the imaging optical system 71. .

<Front cover (cover)>
As shown in FIG. 2, the monitoring device 100 further includes a front cover (cover) 90 that is a resin plate disposed in front of the antenna member 10.
The front cover 90 is attached to the opening 87 of the upper case 80 and covers the aperture 13 of the first type horn 11 and the aperture 23 of the second type horn 21. The front cover 90 is a flat plate having a square front shape and a constant thickness.

FIG. 6 is a schematic cross-sectional view showing the relationship between the main lobe 17 of the first type horn 11 or the main lobe 27 of the second type horn 21 and the front cover 90 of the antenna member 10.
Although the relationship between the second type horn 21 and the front cover 90 will be mainly described here, the first type horn and the front cover 90 have the same relationship.

The front cover 90 has a front portion 91 and a lower surface portion 92.
The front portion 91 is disposed to face the aperture 13 of the first type horn 11 and the aperture 23 of the second type horn 21. The front portion 91 is inclined so that the lower side protrudes forward with respect to the aperture 13 and the aperture 23. That is, the lower edge 90b of the front cover 90 is positioned in front of the upper edge 90a in the direction of the central axis C21 of the main lobe 27 of the second type horn 21. Similarly, the lower edge 90b of the front cover 90 is located in front of the upper edge 90a in the direction of the central axis C11 of the main lobe 17 of the first type horn 11.
The lower surface portion 92 extends toward the antenna member 10 at the lower edge 90 b of the front cover 90 and covers a part of the lower surface of the antenna member 10. The lower surface portion 92 closes a gap between the lower edge 90 b of the front cover 90 protruding forward and the aperture 13 and the aperture 23.

The front cover 90 preferably satisfies the following (Formula 1).
Note that d is the thickness of the front cover 90.
ε is a relative dielectric constant of a resin material constituting the front cover 90.
θ is an angle formed by the normal of the central axis C21 of the main lobe 27 and the plate surface (front surface 90c or back surface 90d) of the front cover 90.
λ is a wavelength in a vacuum of an electromagnetic wave (radar wave) at a frequency oscillated by the second type high frequency circuit unit 42 (that is, a frequency received by the first type high frequency circuit unit 41).
m is a natural number.

The derivation process of (Formula 1) will be described.
As shown in FIG. 6, the radar wave LD enters the front cover 90 from the back surface 90 d of the front cover 90 and is radiated forward from the front surface 90 c of the front cover 90. The radar wave LD is refracted by the back surface 90d of the front cover 90. The traveling direction of the radar wave LD inside the front cover 90 is refracted upward by φ in the following (Equation 2) with respect to the central axis C21 of the main lobe 27.

  Further, the traveling distance DD inside the front cover 90 of the radar wave LD that travels from the back surface 90d of the front cover 90 and reaches the front surface 90c can be expressed as (Equation 3) below using φ.

  When the radar wave LD travels through the front cover 90 and reaches the front surface 90c of the front cover, it is refracted again and radiated forward. Further, the radar wave LD generates a first reflected wave LD1 that is reflected by the front surface 90c of the front cover and travels backward. The first reflected wave LD1 travels backward in the front cover 90, reaches the back surface 90d of the front cover 90, and is reflected again. As a result, a second reflected wave LD2 traveling forward is generated. The travel distance inside the front cover 90 of the first reflected wave LD1 reaching the back surface 90d from the front surface 90c is the same travel distance DD as the radar wave LD.

  The second reflected wave LD2 may cancel the radar wave LD incident on the back surface 90d of the front cover 90 and weaken the radar wave LD. For this reason, it is preferable that the front cover 90 has a thickness d and an angle θ such that the radar wave LD and the second reflected wave LD2 do not cancel each other.

In order to prevent cancellation, it is preferable that the phase of the radar wave LD incident on the back surface 90d and the phase of the second reflected wave LD2 that reaches the back surface 90d and is reflected again are shifted by a half wavelength. The phase of the second reflected wave LD2 is shifted by the phase reciprocating the traveling distance DD with respect to the phase of the radar wave LD incident from the back surface 90d. Further, the wavelengths of the radar wave LD, the first reflected wave LD1, and the second reflected wave LD2 inside the front cover 90 are represented by λ / √ε.
Therefore, by satisfying (Equation 1), the radar wave can be emitted forward without being weakened.
That is, when the front cover 90 is disposed on the front surface of the antenna member 10, it is possible to suppress the waveform disturbance while suppressing the reflection loss of the radar wave LD.

The case where the front cover 90 is made of ABS resin (Acrylonitrile butadiene styrene) will be exemplified. When the frequency of the radar wave is 76 GHz, the wavelength λ of the radar wave is λ = 3.92 mm. The relative dielectric constant ε in the 76 GHz band is ε = 2.67. An angle θ formed by the normal of the plate surface of the front cover 90 and the central axis C21 of the main lobe 27 is temporarily set to θ = 10 degrees. At this time, d is preferably set to 1.2 mm (m = 1).
The relative dielectric constant ε of the resin material constituting the front cover 90 uses a value at a frequency generated by the second type high frequency circuit section 42.

<Assembly structure>
Next, the assembly structure of the monitoring device 100 will be described. FIG. 5 is an exploded view of the monitoring device 100. In FIG. 5, the illustration of the image signal line 60 that connects the imaging device 70 and the second circuit board 50 is omitted.
In the monitoring apparatus 100, the imaging optical system 71 is fixed to the upper case 80, the antenna member 10 is fixed to the upper case 80, and the waveguides (the first type waveguide 8 and the second type waveguide 9 are used). ) And the first circuit board 40 are fixed to the antenna member 10.

The antenna member 10 has four bosses 18 extending in the vertical direction. The bosses 18 are provided with through holes 18a penetrating in the vertical direction.
The second circuit board 50 is mounted on the upper surface of the boss 18 of the antenna member 10. The second circuit board 50 is provided with four fixing holes 53. The four fixing holes 53 are provided at the same positions as the through holes 18a provided in the boss 18 in plan view. A fixing screw 19 is inserted into the fixing hole 53 of the second circuit board 50 and the through hole 18 a of the boss 18 of the antenna member 10. The fixing screw 19 is inserted into a screw hole (not shown) provided on the lower surface of the upper case 80. The second circuit board 50 is sandwiched between the lower surface of the upper case 80 and the boss 18 of the antenna member 10. Thereby, the antenna member 10 is fixed.

  A fixing screw 76 passes through the hole 74b of the flange portion 74a provided in the lens holding member 74 of the imaging device 70. The fixing screw 76 is inserted into a screw hole (not shown) provided on the lower surface of the upper case 80. Thereby, the imaging device 70 is fixed to the upper case 80.

  By adopting such an assembly structure, the imaging optical system 71 and the antenna member 10 are fixed to the upper case 80. That is, the imaging optical system 71 and the antenna member 10 are fixed with the upper case 80 as a reference. Therefore, it becomes easy to manage the azimuth relationship of the antenna (the first type horn 11 and the second type horn 21) and the azimuth relationship of the imaging optical system 71 uniformly.

<Lower cover>
FIG. 7 is a diagram illustrating the monitoring device 100 in a state of being attached to the interior space of the vehicle.
As shown in FIG. 7, the monitoring device 100 may have a lower case 4. The lower case 4 covers the lower surface 10 b of the antenna member 10. The lower case 4 surrounds and stores the periphery of the monitoring device 100 and is attached to the windshield 3 to support the monitoring device 100.

The lower case 4 has a bottom surface portion 4a and a peripheral wall 4b. An antenna member 10 is mounted and fixed on the bottom surface portion 4a. The peripheral wall 4b extends upward from the bottom surface portion 4a and covers four sides of the device stored inside. The peripheral wall 4b is fixed to the windshield 3 at its upper end. An opening 4d is provided in the front wall 4c located in front of the monitoring device 100 in the peripheral wall 4b. By providing the opening 4d, the front wall 4c suppresses the interference of radar waves in the antenna member 10. A hole 4f for connecting an external terminal to the connector 51 is provided in the rear wall 4e located behind the monitoring device 100 in the peripheral wall 4b.
By providing the lower case 4, the design of the monitoring device 100 can be improved. In addition, the monitoring device 100 can be protected.

As described above, according to the present embodiment, the downsized monitoring device 100 can be provided.
The monitoring device 100 may be attached to the indoor space of an automobile. Specifically, the monitoring device 100 may be disposed in the vehicle interior between the windshield and the rearview mirror with the front side facing the windshield of the vehicle. In this case, if the height of the monitoring device 100 (dimension in the Z-axis direction) is large, the monitoring device 100 may hinder the visibility of the driver who drives the vehicle. Moreover, when the width dimension (dimension in the X-axis direction) and the length dimension (dimension in the Y-axis direction) of the monitoring device 100 are large, the monitoring device 100 may be greatly exposed from the rear surface of the room mirror, and the design may be deteriorated. There is.

  The monitoring device 100 of the present embodiment can suppress the height dimension because the five first type horns 11 and the two second type horns 21 are all arranged in the width direction. Therefore, when the monitoring device 100 is attached to the interior space, it is possible to suppress the hindrance to the driver's view.

The monitoring device 100 includes a plurality of first type horns 11 arranged side by side, and the second type horn 21 is not arranged between the first type horns 11. In other words, the monitoring apparatus 100 has a plurality of first type horns 11 arranged in a concentrated manner. It is preferable in terms of efficiency that the first type of high-frequency circuit unit 41 is arranged by concentrating a plurality of receiving ends 41b. The monitoring device 100 has a plurality of first-type horns 11 arranged in a concentrated manner, so that the first-type waveguide 8 connected to each base portion 12 is not complicated, and the first-type horns 11 are concentrated. The high frequency circuit portion 41 can be densely opened.
In addition, the monitoring apparatus 100 can reduce the side lobe in the width direction of the first type horn 11 functioning as a receiving antenna by arranging the plurality of first type horns 11 side by side, and can improve the reception accuracy. Can be increased.

  In the monitoring device 100, the aperture 13 of the first type horn 11 and the aperture 23 of the second type horn 21 are arranged on the same plane in the front-rear direction. Thereby, the front surface of the monitoring apparatus 100 can be comprised linearly, and the monitoring apparatus 100 can be arrange | positioned along the windshield of a vehicle. Thereby, the monitoring apparatus 100 and the windshield can be brought closer to each other, and the interior space can be used effectively.

  Further, in the feed member 30 of the monitoring device 100, the upper surface 30a and the lower surface 30b are not parallel to each other, and the upper surface 30a is inclined forward. Accordingly, the first circuit board 40 fixed to the upper surface 30a of the feed member 30 is inclined forward. That is, the plate surface of the first circuit board 40 extends in the width direction and the height direction of the first type horn 11.

In the monitoring apparatus 100, the second circuit board 50 is disposed above the first circuit board 40. The first circuit board 40 and the second circuit board 50 are preferably arranged in parallel to each other. As a result, the monitoring device 100 provides a certain gap between the first circuit board 40 and the second circuit board 50 to prevent mechanical interference between the boards and to prevent the influence of the mutual electromagnetic field. It can be difficult to give.
In addition, the second circuit board 50 is disposed to be inclined forward along the first circuit board 40 by being parallel to the first circuit board 40. Thereby, the monitoring apparatus 100 can arrange | position the 2nd circuit board 50 close to the antenna member 10 in the front, and can suppress the height dimension of the front. Furthermore, the monitoring device 100 arranges the front upper surface 83 of the upper case 80 so as to be parallel to the second circuit board 50, thereby suppressing the height dimension of the front of the monitoring device 100 and moving the front upper surface 83 forward. Tilt. Thereby, the monitoring device 100 can be expanded below the field of view of the imaging device 70.

  Although the embodiments of the present invention have been described above, the configurations and combinations thereof in the embodiments are examples, and the addition, omission, replacement, and other configurations of the configurations are within the scope not departing from the spirit of the present invention. It can be changed.

  For example, in the embodiment, the monitoring device provided with five first type horns is illustrated, but the present invention is not limited thereto. For example, it is preferable that three or more first-type horns are provided.

In the embodiment, the monitoring device in which the second type horn is provided on each of the left and right sides of the row formed by the first type horn is exemplified. However, at least one of the second type horns only needs to be positioned at the left or right end of the row of the first type horns. For example, two horns may be provided at the right end. Further, the number of second type horns is not limited as long as at least one horn is provided.
In the embodiment, the two second type horns have the same aperture height. However, the heights of the apertures of the plurality of second type horns may be different from each other.

  In the embodiment, the antenna member includes the first type horn and the second type horn, but is not limited thereto. The antenna member may be a directional antenna, for example, an array antenna.

  Further, in the embodiment, the optical axis of the imaging optical system of the imaging apparatus directly passes through the viewing window of the upper case. However, the imaging device may include a prism that changes the direction of the optical axis of the imaging optical system, and the direction of the optical axis is bent by the prism placed in the field window, and the light is guided to a lens facing another direction.

3 ... Windshield 4 ... Lower case 5 ... Feed section,
6 ... 1st type relay hole,
7 ... The second kind of relay hole,
8 ... 1st type waveguide,
9 ... The second type of waveguide,
10: Antenna member,
10a, 30a ... upper surface,
10b, 30b, 40b ... lower surface 11 ... first type horn (antenna),
12, 22 ... the base,
13, 23, 23L, 23R ... aperture,
14 ... lower hole of the first type,
14a, 24a, 33a, 33b, 34a, 34b ... opening,
15 ... Lower groove (groove) of the first type,
17, 27 ... main robe,
18 ... boss 18a ... through hole,
19 ... Fixing screw 21 ... Second type horn (antenna),
21L ... Left end horn,
21R ... right end horn,
24 ... the lower hole (hole) of the second type,
25 ... Lower groove (groove) of the second type,
30 ... feed member,
30c ... lower upper surface,
31 ... The first type upper groove (groove),
32 ... Second type upper groove (groove),
33 ... first type upper hole (hole),
34 ... Second type upper hole (hole),
35 ... recess,
40 ... first circuit board,
41... First type high frequency circuit section,
41a, 41b ... high frequency integrated circuit,
41b ... receiving end,
41c, 42c ... transmission path (microstrip line),
42 ... the second type high frequency circuit section,
42b ... transmitting end,
45. High frequency circuit area,
47. Information processing circuit section,
50 ... second circuit board,
51 ... Connector,
53. Fixing hole,
58 ... power circuit section,
58a ... protection circuit,
58b ... power supply stabilization unit,
59. Information processing circuit section,
60: Image signal line,
61 ... high frequency circuit signal line,
70: Imaging device,
71: Imaging optical system,
72. Image sensor,
73 ... substrate,
74: Lens holding member,
74a ... flange portion,
74b ... hole,
74c ... main body,
75. Imaging optical system assembly,
76 ... Fixing screw,
80 ... Upper case,
81 ... View window,
82 ... rear upper surface,
83 ... front upper surface (flat portion),
84 ... side,
85 ... the rear,
86: Stepped part,
87 ... opening,
90 ... Front cover (cover),
90a ... upper edge,
90b ... lower edge,
90c ... front,
90d ... back side,
91 ... front part,
92 ... lower surface part,
100 ... monitoring device,
C11, C21 ... central axis,
C1a, C1b, C2a, C2b, C3a, C3b ... capacitors,
DD ... travel distance,
D ... Diode,
GL, GL1, GL2 ... Grand line,
In1, In2 ... input terminals,
L: Optical axis,
VL ... Power line,
L1, L2, L3, L4, L5 ... line,
LD ... radar wave,
LD1 ... first reflected wave,
LD2 ... second reflected wave,
REG1, REG2 ... Regulators,
T1, T2 ... terminals,
V: External power supply
Vn ... negative electrode,
Vp ... positive electrode,
ZD ... Zener diode,
out1 ... output terminal,
out2 ... Output terminal,
out3 ... Output terminal

Claims (4)

An imaging optical system facing forward,
An image sensor disposed at a focal position of the imaging optical system;
An antenna member having an antenna with a main lobe extending forward;
A high-frequency circuit section;
A first circuit board on which the high-frequency circuit unit is mounted;
A waveguide connecting the output end of the high-frequency circuit section and the antenna;
An upper case located above the antenna member and having a flat portion;
An information processing circuit section;
A second circuit board on which the information processing circuit unit is mounted;
A high-frequency circuit signal line connecting the high-frequency circuit unit and the information processing circuit unit;
An image signal line connecting the image sensor and the information processing circuit unit;
A connector electrically connected to the second circuit board;
A power supply circuit unit for supplying DC power to the information processing circuit unit and the high frequency circuit unit,
The flat portion of the upper case is inclined in a direction approaching the central axis of the main lobe of the antenna member as it advances forward,
The second circuit board is disposed between the upper case and the antenna member;
The upper case has a viewing window that is a notch or a hole in the middle or rear of the flat part,
The optical axis of the imaging optical system passes through the field window,
The imaging optical system is fixed to the upper case,
The flat portion is located below the field of view of the imaging optical system;
The connector is disposed behind the imaging optical system,
The power supply circuit unit includes at least one capacitor,
The monitoring device, wherein at least one of the capacitors having the maximum inner height is disposed behind the imaging optical system. The antenna member is fixed to the upper case,
The monitoring apparatus according to claim 1, wherein the waveguide and the first circuit board are fixed to the antenna member. A cover that is a resin plate disposed in front of the antenna member;
The cover is a flat plate having a square front shape and a constant thickness,
The lower edge of the cover is located in front of the upper edge in the central axis direction of the main lobe,
The thickness of the cover is d, the relative dielectric constant of the resin material constituting the cover is ε, the angle between the central axis of the main lobe and the normal of the plate surface of the cover is θ, the frequency at which the high-frequency circuit section oscillates The monitoring apparatus according to claim 1 or 2, wherein the following equation is established when the wavelength of the electromagnetic wave in vacuum is λ and m is a natural number.
  The monitoring apparatus according to claim 1, further comprising a lower case that covers a lower surface of the antenna member.