JPH11239288A - Case body structure for video camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve electromagnetic shielding for a stereo camera. SOLUTION: A camera unit 4 is tightly sealed by abutting and screwing a frame 17 fitted and attached to the upper end opening of a conductive lower case 16b to a conductive upper plate 16a to be attached to a machine body or the like through conductive packing 18. Conductive glass 20 for which ITO coating is executed on a surface is mounted in the direction of a lens barrel 12 provided in the camera part 2 of the camera unit 4 and a light shielding cover 21 for limiting more than required incident angle of light to an image pickup element 9 is mounted on the front surface. By the light shielding cover 21, the opening area of an incident window is minimized and the electromagnetic shielding is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure of a video camera which guarantees hermeticity and electromagnetic shielding.

[0002]

2. Description of the Related Art Generally, as a three-dimensional measurement technique based on images, a correlation between a pair of images obtained by imaging an object from different positions with two video cameras (stereo cameras) is obtained, and the stereo camera is determined from the parallax for the same object. 2. Description of the Related Art There is known image processing by a so-called stereo method in which a distance is obtained by a principle of triangulation using camera parameters such as an attachment position and a focal length.

In the image processing by the stereo method, two image signals obtained from a stereo camera are superimposed while being sequentially shifted to obtain a position where the two image signals coincide with each other. -2655
No. 47 discloses this.

[0004]

By the way, when the above-mentioned stereo camera is mounted on an aircraft, a vehicle or the like, and based on images transmitted from the stereo camera, the aircraft or the vehicle is remotely controlled or automatically controlled. It is necessary to take countermeasures against malfunctions of external devices due to electromagnetic waves from the camera and electromagnetic interference of the stereo camera due to external devices.

As a technique for preventing electromagnetic interference, it is conceivable to cover the entire stereo camera with a conductive casing.
However, even with such a conductive casing, an entrance window must be formed in a portion facing the lens of the camera, and when this entrance window is shielded, the transmittance is significantly reduced. In other words, it interferes with image capture.

Further, if the stereo camera is completely sealed, the weight of the entire apparatus increases, which makes it difficult to mount the stereo camera on a radio-controlled airplane or the like.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a video camera housing structure that is lightweight and can prevent electromagnetic interference without significantly lowering the transmittance of an entrance window.

[0008]

In order to achieve the above object, a first video camera housing structure according to the present invention comprises a camera section having an image pickup device, an output signal from the camera section, and a camera section. A processing circuit unit that outputs a drive signal to the conductive plate and a conductive case mounted on the conductive plate are hermetically sealed, and an entrance window of the conductive case where the lens of the camera unit is exposed. It is characterized by mounting conductive glass.

[0009] The housing structure of the second video camera is characterized in that, in the housing structure of the first video camera, a conductive packing is interposed on a joint surface between the conductive plate and the conductive case. Features.

A third video camera housing structure is characterized in that, in the first video camera housing structure, the conductive glass is quartz glass having a surface coated with a transparent conductive coat.

A fourth video camera housing structure is the same as the first video camera housing structure, except that a light-shielding cover for limiting an incident angle of light to the image pickup device is mounted on a front surface of the conductive glass. It is characterized by the following.

That is, in the housing structure of the first video camera, a camera unit having an image sensor and a processing circuit unit for processing an output signal from the camera unit and outputting a drive signal to the camera unit are provided. A camera unit is formed by integrally assembling, the camera unit is fixed to a conductive plate, and a conductive case is attached to the conductive plate to seal the camera unit. In addition, conductive glass is mounted on an entrance window of the conductive case where the lens of the camera section is exposed, and the entrance window is electromagnetically shielded.

[0013] The housing structure of the second video camera is the same as the housing structure of the first video camera, except that a conductive packing is interposed between the conductive plate and the conductive case. Electromagnetically shield the surface.

The housing structure of the third video camera is the same as the housing structure of the first video camera, except that the conductive glass is made of quartz glass having a transparent conductive coating on the surface, so that the entrance window can be formed. Electromagnetic shielding without lowering transmittance.

The housing structure of the fourth video camera is the same as the housing structure of the first video camera, except that a light-shielding cover for limiting an incident angle of light to the image pickup device is mounted on a front surface of the conductive glass. In addition, the opening area of the entrance window is minimized, and the electromagnetic shielding property is improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 in the figure denotes a stereo camera, in which a camera unit 4 in which a camera unit 2 and a processing circuit unit 3 are integrated is housed.

As shown in FIG. 4, a main stay 5 and a sub-camera 6 are arranged at a predetermined interval on a camera stay 7 provided in the camera section 2. The camera stay 7 is formed by processing one aluminum plate.

A circuit board 10 (see FIG. 2) on which an image pickup device 9 such as a CCD is mounted is fixedly mounted on the back surface of a mount 8 provided on each of the cameras 5 and 6. A peripheral circuit board 11 in which a circuit is incorporated is fixed via a spacer 11a.

A boss 8a protruding from the front of each mount 8 of the cameras 5 and 6 is mounted on a mount mounting window 7a (see FIG. 2) formed in the camera stay 7, and is screwed. It has been stopped. A lens barrel 12 is screwed into a boss 8a formed on each mount 8 from the front. The two cameras 5 of the camera stay 7
At the center between the six holes 6, a mounting hole 7b is provided.
There are several places.

The center rear surface of the camera stay 7 is in contact with the front center of the camera base 13 via a stay mounting spacer 14 having an H-shaped cross section.
It is fixed by the screw inserted through b. Further, a connector mounting plate 15 on which a connector 15b is mounted is vertically provided behind the camera base 13.

Since only the center of the camera stay 7 is screwed to the camera base 13, no excessive force is applied to the cameras 5 and 6, and the shape of the stay mounting spacer 14 is changed. By deforming, it becomes possible to point the camera in an arbitrary direction.

The processing circuit section 3 includes an image processing circuit for processing image signals from the two image pickup devices 9, a stereo processing circuit for performing stereo processing on both image signals, and the image pickup device 9.
And a plurality of circuit boards 3a in which processing circuits such as a CCD drive circuit for outputting a drive signal are incorporated. Each of the circuit boards 3a is stacked via a board fixing spacer (not shown). It is screwed to the camera base 13. The camera base 13 and the substrate fixing spacer are made of a relatively lightweight and rigid resin such as plastic POM (polyoxymethylene).

The camera unit 4 is housed in a camera housing 16. The camera housing 16 has a sealed structure having a shielding property, and can be divided into an upper plate 16a fixed to an outer wall or the like of a body of a radio-controlled airplane or the like and a lower case 16b mounted on the upper plate 16a. is there. The upper plate 16a is formed by processing a relatively thick plate, and the lower case 16b is formed by processing a relatively thin plate, both of which have conductivity such as an aluminum plate. Plate material is used.

The camera base 13 of the camera unit 4
Are screwed to the upper plate 16a. A frame 17 formed by processing a conductive member such as aluminum is fitted and screwed around the outer periphery of the upper end of the lower case 16b, and the joint is sealed with solder. Further, the frame 17 and the upper plate 16a
A groove is formed on the joint surface between the upper plate 16a and the frame through the groove. The screw 17 is screwed in a state in which the contact surface with 17 is in close contact.

A surface of the lower case 16b facing the direction of each of the cameras 5 and 6 provided in the camera section 2 is opened, and a conductive member such as aluminum is used as a material in this opening. The lower plate 19 is fitted and screwed, and the joint is sealed with solder. An entrance window 19a is formed in the lower plate 19 in front of the cameras 5 and 6, and a parallel flat glass plate 20 is bonded to the front surface of the entrance window 19a via a conductive adhesive. Therefore, the joint surface between the parallel flat glass plate 20 and the lower plate 19 is sealed with the conductive adhesive.

The parallel plane glass 20 is a quartz glass having a surface coated with an ITO film having conductivity, which enables electromagnetic shielding without significantly lowering the transmittance, and enables the image pickup device 9 to capture an image. become.

A light-shielding cover 21 made of a conductive material such as aluminum is mounted on the front surface of the parallel flat glass 20. The light-shielding cover 21 limits the incident angle of light to the image pickup device 9 and prevents light from being incident more than necessary. Obstacles can also be prevented. A frame 22 is mounted on the outer surface of the connector mounting plate 15 via the lower case 16b. A groove 15a for packing is formed in the connector mounting plate 15, and the lower case 16b is formed by the connector mounting plate 15 and the frame 22.
And seal the packing by crushing the packing.

According to such a configuration, since the camera section 2 and the processing circuit section 3 are mounted close to each other via the camera base 13, the size can be reduced. or,
Since the length of the cable connecting between the two is reduced, not only the noise resistance is improved, but also the wiring work is facilitated and the handling is improved.

Since only the center portion of the camera stay 7 is fastened, no excessive force is applied to each of the cameras 5 and 6 fixed to the camera stay 7, and both the cameras 5 and 5 at the time of assembly are not attached. 6 is prevented from being shifted.

Further, by forming the camera base 13 and the spacer for fixing the substrate from plastic POM, the weight can be reduced while maintaining the rigidity.

Further, since the connector mounting plate 15 is vertically attached to the camera base 13 and integrated with the processing circuit section 3 and the camera section 2, these can be taken out integrally, and workability at the time of circuit check is improved. Get better.

Further, since the camera stay 7 is fixed to the camera base 13 via the stay mounting spacer 14, the shape of the stay mounting spacer 14 or the camera stay 7 with respect to the stay mounting spacer 14 is provided. By changing the mounting position, the directional direction of the camera unit 2 can be arbitrarily set.

Further, since the camera unit 4 is completely sealed by the camera housing 16 having conductivity, the camera unit 4 has good electromagnetic shielding properties and waterproofness, can be installed outdoors, and has good handleability. Further, in the camera housing 16, only the camera base 13 is connected to the upper plate 1.
Since the camera unit 2 and the processing circuit unit 3 have a so-called floating structure fixed to the camera unit 6a, no excessive force is applied to the camera unit 2 and the processing circuit unit 3, and the manufacturing and assembly are easy and the durability is excellent.

[0034]

According to the first aspect of the present invention, the camera section and the processing circuit section are sealed by the conductive plate and the conductive case mounted on the conductive plate, so that the electromagnetic shielding property is good. Electromagnetic interference can be prevented well. Further, since the conductive glass is mounted on the entrance window through which the lens of the camera section is exposed, the entrance window can be electromagnetically shielded.

According to the second aspect of the present invention, since the conductive packing is provided on the joint surface between the conductive plate and the conductive case, the electromagnetic shielding property of the joint surface is improved.

According to the third aspect of the present invention, the conductive glass is made of quartz glass having a transparent conductive coating on the surface, so that the incidence window is not significantly reduced in transmittance and the electromagnetic shielding is achieved. can do.

According to the third aspect of the present invention, a light-shielding cover for limiting an incident angle of light is mounted on the surface of the conductive glass. The performance is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera housing.

FIG. 2 shows a camera unit housed in a camera housing;
Sectional view corresponding to AA of FIG.

FIG. 3 is a perspective view of a camera unit excluding a processing circuit unit.

FIG. 4 is a perspective view of a camera unit.

[Explanation of symbols]

 Reference Signs List 2 camera unit 3 processing circuit unit 4 video camera unit 9 imaging element 12 lens barrel 16 camera housing 16a conductive plate (upper plate) 16b conductive case (lower case) 18 conductive Packing 19a: entrance window 20: conductive glass (parallel plane glass) 21: light shielding cover

Claims (4)

[Claims] 1. A conductive plate and a processing circuit for processing an output signal from the camera unit and outputting a drive signal to the camera unit are mounted on the conductive plate and the conductive plate. A video camera housing structure, wherein the video camera is sealed with a conductive case, and a conductive glass is mounted on an entrance window of the conductive case through which a lens of the camera unit is exposed. 2. A video camera housing structure according to claim 1, wherein a conductive packing is interposed at a joint surface between said conductive plate and said conductive case. 3. The video camera housing structure according to claim 1, wherein said conductive glass is quartz glass having a surface coated with a transparent conductive coat. 4. The video camera housing structure according to claim 1, wherein a light-shielding cover for limiting an incident angle of light to said image sensor is mounted on a front surface of said conductive glass.