JPH08139975A - Panning tilt camera - Google Patents

Abstract

PURPOSE: To make the entire configuration small in size by providing a lens unit and a tilt means to the camera main body so as to design the entire camera to be made up of units. CONSTITUTION: The camera main body is made up of a video printed circuit board 30, a mount frame 34, a lens unit 36, a tilt mechanism 12 tilting the lens unit 36, and a camera connection flexible cable 38. The lens unit 36 is supported freely turnably around a horizontal axial line (tilt free) via support shafts 40A, 40B extended along with the horizontal shaft from a couple of a raised upright pieces 34A, 34B of the mount frame 34. As a result, a link piece 34C of the mount frame 34 gives any hindrance to the turning of the lens unit 36 and the height of the monitor camera 10 is decreased and the entire size of the camera 10 is made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pan-tilt camera having a camera body which can be tilt-driven about an axis parallel to a mounting surface and can be pan-driven about an axis orthogonal to the mounting surface.

[0002]

2. Description of the Related Art Conventionally, various pan-tilt cameras having a camera body that can be tilt-driven about an axis parallel to a mounting surface and can be pan-driven about an axis orthogonal to the mounting surface are known. For example, it is used for surveillance cameras and the like. Here, in the conventional pan-tilt camera, the camera body is mounted on a mount of a pan-tilt mechanism that can be tilt-driven and pan-driving, and the mount is independently tilt-driven and pan-driven. The camera body is configured to be tilted and panned.

[0003]

In other words, in the prior art, the camera body and the pan / tilt mechanism are independently configured, and any camera body can be attached to the pan / tilt mechanism. It has been pointed out that the pan-tilt camera completed by attaching the main body to the pan-tilt mechanism is large in size as a whole, and when it is used secretly as a surveillance camera, it is noticeable because of its large size. And a solution is required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a pan-tilt camera which can be downsized as a whole by unitizing it. That is.

[0005]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a pan-tilt camera according to the present invention has, for example, according to the description of claim 1, a camera main body arranged so as to be panable around an axis orthogonal to a mounting surface of the pan-tilt camera, and the camera main body. The camera body includes a pan unit for pan driving, and the camera body includes a lens unit tiltably arranged around an axis parallel to the mounting surface, and a tilt unit for tilt driving the lens unit. It is characterized by having.

According to a second aspect of the present invention, a pan-tilt camera according to the present invention has a lens unit and a tilt for driving the lens unit around an axis parallel to a mounting surface of the pan-tilt camera. It is characterized by comprising a camera main body having a built-in means, and a pan means for pan-driving the camera main body around an axis perpendicular to the mounting surface.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A configuration of an embodiment of a pan-tilt camera according to the present invention will be described below in detail with reference to the accompanying drawings in the case of being applied to a surveillance camera.

[Schematic Description of Overall Structure] As shown in FIGS. 1 and 2, a surveillance camera 10 according to this embodiment includes a camera body 14 having a tilt mechanism 12 built-in, and a camera body 14.
Pan mechanism 1 for pan driving (that is, rotating around a vertical axis orthogonal to the mounting surface of the surveillance camera 10)
6, a control unit 18 that controls the entire surveillance camera 10, and a power supply unit 20 as a power supply source to the surveillance camera 10.
, A semi-spherical transparent dome cover 24 having an open lower surface for covering the camera body 14, and a pan mechanism 16 and the main board 22 for covering the camera body 14 as a whole. A bottom cylindrical cover 26 is provided, and the configuration is roughly configured.

The dome-shaped cover 24 and the cylindrical cover 2
6 is detachably connected to each other, and in the connected state, the outer surface of the surveillance camera 10 is entirely defined. The surveillance camera 10 is attached to the bottom surface of the cylindrical cover 26, for example, facing downward on the ceiling surface. Here, the mounting of the surveillance camera on the ceiling surface is an example, and it goes without saying that it may be mounted on a standing surface such as a wall.

[Description of Camera Body 14] In the camera body 14 described above, a video circuit board 30 having an opening 28 for taking out a cable is formed in the central portion, and the video circuit board 24.
Mounting frame 3 fixed on the upper side with a spacer 32
4 and a lens unit 3 pivotally supported (that is, tiltable) around a horizontal axis set substantially parallel to the mounting surface of the surveillance camera 10 on the mounting frame 34.
6, a tilting mechanism 12 for tilting the lens unit 36, which is mounted on the mounting frame 34, and a camera connection for electrically connecting the lens unit 36 and the video circuit board 30, as will be described later in detail. And a flexible cable 38 for use.

The above-mentioned mounting frame 34 is formed in a so-called gate shape in a front view, and more specifically, a pair of standing pieces 34A, 34 standing on both sides of the video circuit board 30.
B and a connecting piece 34C that connects the leading end portions of the standing pieces 34A and 34B to each other are integrally formed of a rigid member. The characteristic shape of the mounting frame 34 in this embodiment will be described later in detail with reference to FIG.

Here, the lens unit 36 described above is
Rotation around the horizontal axis described above through the support shafts 40A and 40B extending along the horizontal axis to the pair of upright pieces 34A and 34B of the mounting frame 34 at approximately the center in the longitudinal direction. It is pivotally supported freely (that is, freely tiltable). Incidentally, the respective support shafts 40A and 40B are taken out through the corresponding upright pieces 34A and 34B, respectively. In addition, the lens unit 36 includes a zoom motor 42, as schematically shown in FIG. 3 as a block diagram.
Power zoom mechanism 42 having A and iris motor 4
An auto iris mechanism 44 having 4A, an autofocus mechanism 46 having a focus motor 46A, and a CCD sensor 48 as an image sensor are mainly provided in a built-in state.

In this embodiment, the lens unit 36 has a horizontal position where its central axis is substantially parallel to the mounting surface of the surveillance camera 10, as shown by the solid line in FIG. As indicated by a broken line in FIG. 4, the central axis is approximately 9 between the central position and a vertical position which is substantially perpendicular to the mounting surface.
It is set to rotate freely over 0 degrees.

Therefore, the spindle 40A (40B) is the origin, and the horizontal axis passing through the spindle 40A (40B) is the horizontal axis.
In the graph having the vertical axis passing through the support shaft 40A (40B) as the vertical axis, assuming that the graph is rotated from the horizontal position in the counterclockwise direction to the vertical position, the graph shown in FIG. Areas corresponding to the first and third quadrants are defined as the rotation range of the lens unit 36. Therefore, it is impossible to dispose a member that inhibits the rotation of the lens unit 36 in the regions corresponding to the first and third quadrants. However, the area corresponding to the second and fourth quadrants is the lens unit 36.
Exists regardless of the range of rotation of the lens unit, and the members provided here do not hinder the rotation of the lens unit 36 at all.

Therefore, in this embodiment, the connecting piece 34C of the mounting frame 34 is formed so as to be disposed only in the region corresponding to the second quadrant described above. As a result, the connecting piece 34C of the mounting frame 34
However, the size of the surveillance camera 10 in the height direction can be suppressed compactly without hindering the rotation of the lens unit 36, thereby promoting miniaturization of the surveillance camera 10 as a whole. You will be able to.

{Explanation of Tilt Mechanism 12} As described above, the tilt mechanism 12 incorporated in the camera body 14 for rotationally driving the lens unit 36 in the tilt direction (that is, tilt driving) is shown in FIG. Thus, the tilt motor 50 attached to the inner surface of the one upright piece 34A of the attachment frame 34 is provided. The motor shaft 50A of the tilt motor 50 penetrates from one of the upright pieces 34A through a through hole (not shown) formed in the upright piece 34A, and is taken out to the outside. A drive pulley 52 is coaxially fixed to the end portion. The tilt motor 50 is composed of a reversible stepping motor in this embodiment.

Further, the driven pulley 5 is attached to the one support shaft 40A which is taken out to the outside by penetrating the one standing piece 34A.
4 is fixed coaxially, and an endless belt 56 is spanned between the drive side pulley 52 and the driven side pulley 54 so that power can be transmitted. In this way, when the tilt motor 50 is activated counterclockwise in the figure, the lens unit 36 is rotationally driven (tilt drive) from the horizontal position to the vertical position, while it is activated clockwise in the figure. As a result, the lens unit 36 is rotationally driven (tilt driven) from the vertical position to the horizontal position.

Here, in this embodiment, the tilt motor 50 is regulated so as to be arranged only in the region corresponding to the above-mentioned fourth quadrant. As a result, the tilt motor 50 can promote the miniaturization of the entire configuration without hindering the rotation of the lens unit 36 and without enlarging the overall size of the surveillance camera 10. It will be.

Further, in this embodiment, since the camera body 14 is constructed with the tilt mechanism 12 built therein, it is necessary to connect the camera body to the conventional tilt mechanism having both the pan function and the tilt function. As a result, the overall configuration of the surveillance camera 10 can be made smaller and lighter than in the case where the camera body is pan-driven and tilt-driven.

Further, in this embodiment, the mounting frame 34 for supporting the lens unit 36 in a tiltable manner.
Is fixed on the video circuit board 30 constituting the camera body 14, so that a mounting base to which the mounting frame 34 is fixed is separately provided, and the video circuit board is fixed to this mounting base. In comparison, the monitoring camera 10
It is possible to reduce the size and weight of the entire structure of the device and reduce the cost thereof.

Further, in this embodiment, the lens unit 36 has a pair of upright pieces 34A, 34B of the mounting frame 34 at a substantially central portion in the longitudinal direction thereof.
It is tiltably supported by support shafts 40A and 40B. As a result, the size of the dome cover 24 that covers the lens unit 36 can be minimized, and the overall configuration can be made smaller and lighter.

{Explanation of tilt position detection mechanism 58}
A tilt position detection mechanism 58 for detecting the rotation position of the lens unit 36, that is, the tilt position is attached to the tilt mechanism 12. As shown in FIG. 5, the tilt position detection mechanism 58 meshes with the tilt gear 60, which is coaxially fixed to the support shaft 40B which is penetrated through the other upright piece 34B and taken out to the outside. And a tilt rotation amount detection unit 62 that detects the rotation amount of the lens unit 36 in the tilt direction based on the rotation amount of the detection gear. The tilt rotation amount detection unit 62 is connected to the video circuit board 30 via a tilt position detection cable 64.

The tilt motor 50 is connected to the video circuit board 30 via a tilt motor control cable 66. Thus, in this embodiment, the tilt position detection cable 64 and the tilt motor control cable 6 are used.
6 are both connected to the video circuit board 30, but simply pass through the video circuit board 30 as a connection board, and the control unit of the main board 22 described above is connected via a main flexible flat cable 68 described later. It is connected to 18.

That is, in this embodiment, the video circuit board 30 is provided with a function as a connection board when the camera body 14 and the main board 22 are electrically connected. As a result, the size and weight of the device can be reduced and the cost can be reduced as compared with the configuration in which the connection substrate is separately provided.

Here, the control unit 18 calculates a rotation amount (that is, a tilt amount) from a reference position (not shown) (for example, a horizontal position) based on the detection information from the tilt rotation amount detection unit 62. Thus, the current tilt position of the lens unit 36 is set to be detected.

Since the tilt mechanism 12 is configured as described above, the tilt motor 5 is controlled under the control of the controller 18.
When 0 is activated, the lens unit 36 is tilt-driven between the horizontal position and the vertical position described above, and the tilt position information is the tilt position detection mechanism 58.
The tilt position of the lens unit 36 is always detected in the control unit 18 by detecting the detection result by the control unit 18.

{Explanation of the pan mechanism 16} The main board 22 described above is fixed to the bottom of the cylindrical cover 26,
Immediately above the main board 22, a mounting base 70 is arranged in a state of being fixed to the cylindrical cover 26 with a predetermined space therebetween via a spacer (not shown). On this mounting base 70, a pan mechanism 16 for driving the camera body 14 (and thus the lens unit 36) to rotate (that is, to pan) about the vertical axis described above is mounted.

The pan mechanism 16 includes a pan base 74 fixed above the mounting base 70 via columns 72 at a predetermined interval. On this bread base 74,
A turntable 76 is supported rotatably around a vertical axis, and on the turntable 76, the above-mentioned video circuit board 3 is mounted.
0 is fixed via a spacer 78. That is, the camera body 14 is mounted on the turntable 76 so as to rotate integrally therewith. Also, this turntable 76
Is supported on the pan base 74 via an upper thrust bearing 80 so as to be rotatable about a vertical axis.

Here, openings 82 and 8 are formed in the central portions of the rotary table 76, the upper thrust bearing 80 and the pan base 74.
4, 86 are formed respectively, and these openings 82, 8
A hollow-cylindrical support shaft 88 is inserted from above through 4, 86 in order. The lower end of the support shaft 88 is taken out below the pan base 74. The support shaft 88 is press-fitted into the opening 82 of the rotary table 76, and thereby fixed to the rotary table 76 so as to rotate integrally therewith.

A driven gear 90 for rotationally driving the rotary table 76 is coaxially fixed to the outer periphery of the portion of the support shaft 88 taken out downward from the pan base 74.
A lower thrust bearing 92 is provided between the driven gear 90 and the pan base 74 to rotatably support the lower end of the driven gear 90 and the support shaft 88 to which the fixed gear 90 is fixed with respect to the van base 74. There is. In addition, the support shaft 8 described above
The lower end surface of 8 projects downward from the lower surface of the driven gear 90,
It terminates near the upper surface of the mounting base 70.

Here, as described above, the support shaft 88 itself has the pan base 74 by the upper thrust bearing 80.
Since it is rotatably supported about a vertical axis with respect to the lower thrust bearing 9 in this embodiment.
Reference numeral 2 denotes an upper plate directly defined by the pan base 74, a lower plate directly defined by the driven gear 90, and a plurality of bearing balls 92A provided between the upper plate and the lower plate.
And a retainer 92B for holding these bearing balls at predetermined positions. In other words, in this embodiment, the lower thrust bearing 9
2 is composed of only the bearing ball 92A and the retainer 92B, and is configured not to directly include the upper plate and the lower plate.

By constructing the lower thrust bearing 92 in this embodiment, the size of the surveillance camera 10 along the vertical axis can be reduced. On the other hand, a substantially cylindrical flexible cable guide 94 is fixed on the above-described mounting base 70 while being positioned between the mounting base 70 and the driven gear 90. Here, as shown in FIG. 6, at the protruding end of the support shaft 88 protruding into the flexible cable guide 94,
A notch 96 for allowing the main flexible flat cable 68 to be taken out from the support shaft 88 is formed in a state of penetrating in the thickness direction. Further, the flexible cable guide 94 is formed with a lead-out groove 94A for leading out the main flexible flat cable 68 taken out from the support shaft 88 through the notch 96 in the thickness direction. There is.

A slit 98, through which the main flexible flat cable 68 led out from the lead-out groove 94A is inserted, penetrates in the thickness direction at a portion of the mounting base 70 located outside the flexible cable guide 94. And is formed so as to be open to the lower end surface. The main flexible flat cable 68 led out from the slit 98 is electrically connected to the control unit 18 of the main board 22 described above via a connector (not shown). The shape of the cutout 96 will be described later in detail.

As described above, in this embodiment, the main flexible flat cable 68 for electrically connecting the main board 22 located at the bottom and the video circuit board 30 located at the top has one end at the video circuit board 30. Through a connector, passing through a hollow portion formed in the central portion of the support shaft 88 so as to penetrate along the axial direction thereof,
It is taken out from the lower end of the support shaft 88 into the flexible cable guide 94 through the notch 96 along the radial direction, and is taken out of the flexible cable guide 94 through the lead-out groove 94A formed in this and attached. Base 7
Through the slit 98 formed in 0, the mounting base 70
Is taken out into the space between the main board 22 and the main board 22.
2 is connected.

Therefore, according to this embodiment, the main flexible flat cable 68 does not have to pass through the radially outward region from each of the turntable 76, the pan base 74, and the mounting base 70, so that the pan The cylindrical cover 2 is in close contact with the outer peripheral surfaces of the base 74 and the mounting base 70.
6 can be formed. As a result, the surveillance camera 1
It is possible to reduce the size of the surveillance camera 10 in a compact manner by pressing the size 0 in the radial direction compactly.

The pan mechanism 16 is provided with a pan motor 100 for rotationally driving the rotary table 76 (that is, pan driving the camera body 14 mounted on the rotary table 76). The motor shaft 100A of this is fixed on the mounting base 70 so as to extend along the horizontal axis. On the motor shaft 100A of the pan motor 100, a drive gear 10 including a helical gear is provided.
2 is fixed coaxially, and in this drive gear 102,
The transmission gear 104, which is rotatably supported around a vertical axis, meshes with a helical gear 104A. Here, the transmission gear 104 is coaxial with the helical gear 104A and is a spur gear 104B.
The first intermediate gear 106A meshes with the spur gear 104B, and the first intermediate gear 10A
A second intermediate gear 106B coaxially fixed to 6A meshes with the driven gear 90 described above.

In this way, the driven gear 90 (hence,
(A rotary base 76 connected so as to rotate integrally therewith, and a camera body 14 mounted on the rotary base 76)
When the pan motor 100 starts in one direction,
It is rotationally driven (pan drive) along the clockwise direction in the figure, and is driven in the other direction to be rotationally driven (pan drive) along the counterclockwise direction in the figure.

{Explanation of the pan position detection mechanism 108}
The pan mechanism 16 has a rotary position of the rotary table 76, that is,
A pan position detection mechanism 108 for detecting the pan position is attached. The pan position detection mechanism 108 meshes with a pan gear 110 that meshes with the driven gear 90 at a position different from the position with which the second intermediate gear 106B meshes, and a take-out gear 112 that is coaxially fixed to the pan gear 110. The detection gear 114A is provided, and the pan rotation amount detection unit 114 that detects the rotation amount of the rotary table 76 based on the rotation amount of the detection gear is configured.

The pan rotation amount detecting unit 114 is provided with a pan position detecting cable (not shown) which has the slit 9 described above.
8 is inserted, and is electrically connected to the above-described control unit 18 via a connector (not shown). And
In this control unit 18, the pan rotation amount detection unit 1
The lens unit 3 is calculated by calculating the pan amount (that is, the swing amount) from a reference position (not shown) (for example, a rotation position that defines the standby state) based on the detection information from 14.
6 is set to detect the current pan position.

Since the pan mechanism 16 is constructed as described above, the pan motor 100 is controlled under the control of the controller 18.
When the camera is started, the camera body 14 is pan-driven as a whole, and the pan position information is detected by the pan position detection mechanism 108, and the detection result is the control unit 1.
8 is sent to the lens unit 3 in the control unit 18.
The pan position of 6 is always detected.

{Main flexible flat cable 6
Description of Attachment Mode of 8 to Support Shaft 88} Next, an attachment mode of the main flexible flat cable 68 described in the pan mechanism 16 to the support shaft 88 will be described with reference to FIGS. 6 to 8.

First, as shown in an enlarged state in FIG.
The notch 96 described above is defined as a space between the concave surface 96A and the convex surface 96B that are arranged so as to face each other, and the concave surface 96A and the convex surface 96B are each configured by a smooth curved surface (arcuate surface). There is. As shown in FIG. 7, the concave surface 96A and the convex surface 96B are provided with a cutout 96 in a state in which the main flexible flat cable 68 is bent and deformed in the same direction as the bending direction of these curved surfaces.
It is set so as to face each other while being separated from each other by the minimum required distance when being inserted from the lower opening end of the.

Here, as shown in FIG. 7, the concave surface 96A is defined so as to be concave along the extraction direction of the main flexible flat cable 68, and the convex surface 96B is defined so as to project along the extraction direction. Has been done. By forming the notch 96 in this manner, the main flexible flat cable 68 passing therethrough is once made to face the direction opposite to the take-out direction in a state where the main flexible flat cable 68 is taken out to the outside of the support shaft 88, as shown in FIG. As described above, it is folded in a so-called U-turn state with a large curvature in the middle part.

As a result, the driven gear 90 is rotationally driven based on the operation of the pan mechanism 16 described above, whereby
Although the support shaft 88 fixed to the driven gear 90 is rotated, FIG. 8 shows the support shaft 88 rotated from the state shown in FIG. 6 in the counterclockwise direction. As is apparent from FIGS. 6 and 8, the position of the folded portion in the main flexible flat cable 68 is sequentially moved (transitioned) with the rotation of the support shaft 88, and the same portion may be repeatedly subjected to a bending force. It will be surely suppressed. Thus, according to this embodiment, the possibility of breakage of the main flexible flat cable 68 due to the rotation of the support shaft 88 is reduced, the durability is improved, and the reliability is improved. Become.

Further, as described above, since the cutout 96 is composed of the arcuate concave surface 96A and the convex surface 96B facing each other, as compared with the case where the main flexible flat cable 68 is inserted through the straight cutout. As a result, the main flexible flat cable 68 is more reliably frictionally engaged with the respective surfaces of the concave surface 96A and the convex surface 96B. As a result, in this embodiment, the main flexible flat cable 68 is simply inserted through the notch 96 and attached to the support shaft 88 without using any fixing tool. Therefore, it is possible to reduce the number of assembling steps by omitting the fixing operation at the time of assembling the surveillance camera 10, and it is possible to reduce the number of parts by not using the fixing tool, thereby reducing the cost. It can be effectively achieved.

[Description of Control System] Next, the configuration and control operation of the control system of the surveillance camera 10 will be described with reference to the block diagram of FIG.

{Description of Control System Configuration} First, the control system configuration of the surveillance camera 10 will be described with reference to FIG.

As described above, the control section 18 defined on the main board 18 is internally provided with the control circuit section 18A.
And a communication drive unit 18B, a motor drive unit 18C, and a position detection unit 18D that are respectively connected to the control circuit unit 18A. Also,
The above-mentioned video circuit board 30 includes the timing generator 3
0A, a video signal generator 30B, an iris drive circuit 30C, and an autofocus circuit 30D are provided, and are properly connected to the components provided in the lens unit 36 as described above.

The lens unit 36 includes a CCD for driving the CCD sensor 48 in addition to the above-mentioned components.
A drive circuit 116, a sample hold circuit 118 for temporarily holding the signal output from the CCD sensor 48, and a zoom position detection mechanism 120 for detecting the zoom position of the imaging lens by the power zoom mechanism 42.
And a focus position detection mechanism 1 for detecting the focus position of the imaging lens by the autofocus mechanism 46.
22 is further provided.

Here, CC in the lens unit 36
The D sensor 48 outputs the signal generated by the timing generation unit 30A of the video circuit board 30 to the lens unit 36.
It is configured to operate by the drive pulse signal generated through the CCD drive circuit 116 of. Also, C
The output from the CD sensor 48 is the sample hold circuit 1
18, the video signal processing unit 3 of the video circuit board 30
At 0B, it is converted into an NTSC video signal. The timing generator 30A and the video signal processor 30B described above are configured to instruct the shutter speed of the CCD sensor 48 and the opening degree of the iris by the control circuit unit 18A in the control unit 18.

On the other hand, the video signal processing section 30B of the video circuit board 30 sends an iris control signal (that is, a signal instructing the opening degree of the iris) to the iris drive circuit 30.
The iris drive circuit 30C is configured to drive and control the iris motor 44A of the lens unit 36 based on the iris control signal.
Further, the current level of the diaphragm is returned from the auto iris mechanism 44 to the video signal processing section 30B, and the control circuit section 10 of the control section 18 is based on the current level of the diaphragm.
A is configured so that the F value of the diaphragm at that time can be detected.

Further, the autofocus circuit 30D of the video circuit board 30 receives a part of the video signal from the video signal processing unit 64, AD-converts this part, and detects the contrast level of the image based on the digitized data. Then, this detection result is used as the control circuit unit 1 of the control unit 18.
It is configured to output to 8A. The control circuit unit 18A is configured to detect a change in image contrast caused by driving the focus lens, and perform an autofocus control operation so as to define the highest contrast position as the in-focus position. Has been done.

Further, the control circuit section 1 of the control section 18
Although not shown, 8A mainly includes a CPU having an AD conversion function and an asynchronous serial communication function, and a C
It is configured to include a RAM and a ROM necessary for the PU to operate. The CPU is the video circuit board 30.
The shutter speed etc. to the timing generator 30A of
The video signal processing unit 30B of the video circuit board 30 is instructed to control the brightness and control amounts of the iris and the like, the current F value of the iris is read, and the status of each drive unit is detected by the position detection unit
It is configured to drive and control each motor through the motor drive unit 18C while detecting the output from the 8D by AD conversion, and decode the instruction from the host computer 124 and execute the instruction based on the instruction. There is.

Here, communication with the host computer 124 in this CPU is configured to be performed in the communication drive section 18B. Further, the communication drive unit 18B is configured to be able to communicate not only with the host computer 124 but also with other monitoring cameras 10A, 18B, .... That is, the surveillance camera 10 has a plurality of communication circuits, and is configured so that the plurality of surveillance cameras 10A, 10B, ... And the host computer 124 are loop-connected.

Specifically, as shown in FIG. 9, the surveillance camera 10 of this embodiment is connected to the host computer 124 via a communication cable 126A, and the surveillance camera 10 is connected to the first other camera. The monitoring camera 10A is connected via a communication cable 126B, and the second other monitoring camera 10B is connected to the first other monitoring camera 10A via a communication cable 126C.

Whether or not the second other monitoring camera 10B, which is the final connection device in this embodiment, is connected to the host computer 124 depends on the system control method of the host computer 124. In this embodiment, the connection cable 126 is
As indicated by the broken line D, the second other monitoring camera 10B as the final connection device is not connected to the host computer 124.

In this way, a plurality of surveillance camera groups 10, 1
Since 0A and 10B are connected to the host computer 124, a command from the host computer 124 is first transmitted to the surveillance camera 10 of this embodiment, and the first other surveillance is performed via the surveillance camera 10. Camera 10A
And is transmitted to the second other monitoring camera 10B via the first other monitoring camera 10A. Further, the information from the second other monitoring camera 10B is sequentially passed through the first other monitoring camera 10A and the monitoring camera 10 of this embodiment, and then the host computer 124.
Will be transmitted to.

In this embodiment, the host computer 124 and the monitoring camera groups 10, 10A, 10B are used.
Is not limited to the loop-like connection mode as shown in FIG. 9, and as shown as a modified example in FIG. 10, the host computer 124 and the monitoring camera groups 10, 10A, 1
0B means connection cables 126A, 126B, 12 respectively.
You may make it connect separately via 6C.

On the other hand, on the main board 22 described above, in addition to the control section 18 and the power supply section 20, the mixing / separating circuit section 128 is provided.
Is provided. By including the mixing / separating unit 128, a video signal can be placed on a power supply and output, and a video signal component can be taken out from the input power supply and only the power supply component can be supplied to the power supply unit 20. become. Thus, for example, if there is no communication with the host computer 124 or the like, the surveillance camera 10 can be installed with one coaxial cable.
The power supply unit 20 is configured to be able to supply necessary voltage and current to each circuit unit.

The motor drive section 18C of the control section 18 described above includes a focus motor 46A and a zoom motor 42A mounted on the lens unit 36, a tilt motor 50 provided in the tilt mechanism 12, and a pan mechanism 16.
And a drive circuit corresponding to each of the pan motors 100 provided in. In this embodiment, the focus motor 46A and the zoom motor 42A are DC motors, the tilt motor 50 and the pan motor 100 are stepping motors, and the drive circuit described above is
The DC motor and the stepping motor are configured to be compatible with each other.

The position detecting section 1 of the control section 18 described above
8D is a tilt position detection mechanism 58 and a pan position detection mechanism 1
08, the zoom position detection mechanism 120, and the focus position detection mechanism 122 are supplied with DC voltages, and the detection signals output from the detection mechanisms 58, 108, 120, and 122 are supplied to the A / D of the CPU of the control circuit unit 18A. It is connected to output to the conversion terminal.

{Explanation of control operation of the lens unit 36}
Next, the control mode of the lens unit 36 in the controller 18 will be described with reference to Table 1 below.

[0063]

[Table 1] --Summary of Control Operation-- First, as shown in Table 1, the control unit 18 sets the control mode for the video signal in the lens unit 36 as follows.
It has a total of 6 control modes: "white" mode, "AE" mode, "shutter" mode, "iris" mode, "gain" mode, and "exposure compensation" mode. As a control mode for the motor built in the lens unit 36, there are two control modes, a "zoom" mode for controlling the zoom motor 42A and a "focus" mode for controlling the focus motor 46A. .

--- Description of "white" mode --- The "white" mode is a control mode for adjusting the white balance, and automatically adjusts the optimum white balance to {auto white} and the color temperature in the room. There are a total of three types of control contents: {indoor white} to set to {1} and {outdoor white} to set to an outdoor color temperature.

--- Description of "AE" Mode --- "AE" mode is a control mode relating to automatic exposure. The exposure is performed by the shutter speed of the CCD sensor 48, the aperture value of the auto iris mechanism 44, and the video AGC amplifier. It is set to be determined based on three control elements of gain. In this embodiment, as the “AE” mode, two types of “auto AE” for setting all three control elements under internally set conditions and any one control element are set arbitrarily. There are three types of [priority AE] that can be specified in [1] and [manual AE] that can arbitrarily set all control elements. [Manual AE] is set by turning off [Auto AE].

Here, as [Auto AE], {Full Auto AE} for executing the automatic exposure with the optimum operating condition designated by the internal setting and the internal setting for limiting the operation of the iris motor 44A as much as possible. There are two types of control contents in total, {iris protection auto AE} for executing automatic exposure designated by. This {iris protection auto AE} constitutes one of the control features of this embodiment, and this control procedure will be described below with reference to FIG.
This will be described with reference to the flowchart shown in FIG.

** Explanation of {iris protection auto AE} *
* First, when this {iris protection auto AE} is set, the control unit 18 checks the current incident light amount on the CCD sensor 48 based on the detection result of the CCD sensor 48 (step S10). Then, based on the check result, it is determined whether the amount of incident light has changed (step S1).
2) If it is determined that the amount of incident light has not changed (that is, NO in step S12), the original step S10 is performed.
Then, the following control procedure is repeatedly executed.

On the other hand, if YES is determined in the above step S12, that is, if it is determined that the incident light amount is changed, the gain of the video AGC amplifier is adjusted by a predetermined amount (step S14). Although not described in detail, when the incident light amount increases, the gain is adjusted to decrease, and when the incident light amount decreases, the gain is adjusted to increase. Is set to. And the current amount of gain,
The current amount of the shutter speed in the CCD sensor 48 is read (step S16), and it is determined whether the sum of the converted Ev values of both exceeds a predetermined limit value A (step S18).

If it is determined that the sum of the current amount of gain and the current amount of shutter speed does not exceed the predetermined limit value A (that is, NO in step S18), the value after the change is made. It is determined whether the current value of the gain exceeds a predetermined limit value B (step S20). Then, when it is determined that the current value of the gain does not exceed the predetermined limit value B (that is, NO in step S20), proper exposure is obtained with the currently set gain, shutter speed, and aperture. It is determined whether or not (step S22).

If it is determined that the proper exposure has been obtained (that is, YES in step S22), the process returns to step S10 described above, and the control procedure after the incident light amount check is repeatedly executed. On the other hand, when it is determined that the proper exposure has not been obtained (that is, N in step S22).
In O), the process returns to step S14 described above, and the control procedure after the gain adjustment is repeatedly executed again.

In step S20 described above, Y
If it is determined to be ES, that is, if the current value of the gain exceeds the predetermined limit value B, the gain cannot be adjusted any more. Only the fixed amount is changed (step S24). Although not described in detail, when the incident light amount increases, the shutter speed is increased, and when the incident light amount decreases, the shutter speed is decreased. Is set to change to.

Thereafter, it is determined whether or not the proper exposure is obtained with the currently set gain, shutter speed, and aperture (step S26). When it is determined that the proper exposure has been obtained (that is, YES in step S26), the process returns to step S10 described above, and the control procedure below the incident light amount check is repeatedly executed. On the other hand, when it is determined that the proper exposure has not been obtained (that is, step S2
If NO in 6), the process returns to step S14 described above, and the control procedure after the gain adjusting operation is repeatedly executed again.

On the other hand, if YES is determined in the above step S18, that is, the sum of the current value of the gain and the current value of the shutter speed in the CCD sensor 48 exceeds the predetermined limit value A. If this is the case, the iris motor 4 of the auto iris mechanism 44 is not
4A is driven to change the diaphragm by a predetermined amount (step S28). Although details will be omitted, when the incident light amount changes in the direction of increasing, the diaphragm is changed to a direction in which it is narrowed, and when the incident light amount decreases in the direction, the diaphragm is changed to open. Is set to.

After that, the gain and the shutter speed are respectively returned to the initial setting values (step S30). Then, the process returns to step S10 described above, and the control operation below the check of the incident light amount is repeatedly executed again under the changed diaphragm.

As described above in detail, since the control procedure of {iris protection auto AE} of this embodiment is configured, the gain is first set in the automatic exposure operation executed in accordance with the change of the incident light amount. If the change in gain makes it impossible to cover the automatic exposure operation, then adjust the shutter speed to obtain the correct exposure. If the automatic exposure operation cannot be covered even by the change in the shutter speed, as the last means, the iris motor 44A of the auto iris mechanism 44 is driven to change the aperture.

Here, the iris mechanism, which is a mechanical operating part, is inevitably short in service life according to its driving time. That is, the iris mechanism has a problem in durability. However, as described above, in this embodiment, in the automatic exposure control operation, the gain that is not mechanically driven is first adjusted, then the shutter speed that is not mechanically driven is changed, and the final exposure is changed. Since the iris is only mechanically driven as a means, the life of the iris mechanism can be dramatically extended compared to the conventional configuration in which the iris mechanism is constantly driven to change the aperture value. To improve the durability of the camera 10 for
The reliability of the surveillance camera 10 can be improved.

In this embodiment, the driving of the diaphragm is limited as much as possible, and the diaphragm value is kept constant as much as possible. Therefore, the effect of the depth of focus by the diaphragm can be obtained more stably, and the effect of preventing saturation of the CCD sensor 48 can also be obtained more stably.

** Explanation of [Priority AE] ** As the above-mentioned [Priority AE], {shutter} priority control for executing automatic exposure after designating the shutter speed, and designating the aperture value. There are a total of three types of control contents: {iris} priority control for executing automatic exposure in step 1 and {gain} priority control for executing automatic exposure after specifying a gain. These three types of priority AE control are configured such that, after designating each of them, the designated control station state is designated according to the "shutter" mode, "iris" mode, and "gain" mode shown in Table 1.

The value once specified is stored in the memory even if control such as full-auto is set and it is no longer necessary.
When the priority mode is designated, it is configured to be controlled by the stored value.

Further, as described above, when the [AE] mode is turned off, the [manual exposure] mode is switched and set, and in this case, the three control values are the specified values and are not specified. In this case, an initial setting value (reset value) set in advance as a default value is automatically designated.

--- Explanation of "Exposure Compensation" Mode-- On the other hand, the above-mentioned "exposure compensation" mode is a control mode for controlling the brightness of the screen, and the value set in this "exposure compensation" mode is used as a reference. Then, the above-mentioned "AE" mode is controlled. In this "exposure compensation" mode, the exposure compensation value can be set manually {correction value setting}, the brightness of the current screen can be increased by one step, and the brightness of the current screen can be adjusted. It has a total of three types of control content: {down} for darkening one level. Also, there is {on / off} control content for switching the exposure compensation on / off, and the exposure compensation control is executed with the specified control content when it is on, and the exposure compensation is canceled when it is off. Has been done.

--- Explanation of "Zoom" Mode-- In addition, the "zoom" mode as a control mode for the motor incorporated in the lens unit 36 described above changes the focal length of the zoom lens of the power zoom mechanism 44. This is a control mode of {zoom setting} for driving and controlling the zoom motor 44A so that the focal length is directly specified, and the zoom motor 44A is used so that the focal length changes in the telephoto direction. {Tele} for driving and controlling the zoom, and {Wide} for driving and controlling the zoom motor 44A so that the focal length changes in the wide-angle direction.
And {stop} for stopping the drive of the zoom motor 44A, a total of four types of control contents are provided.
Incidentally, the driving of the zoom motor 44A is automatically stopped when the focal lengths of the zoom lens reach the respective driving ranges on the telephoto side and the wide-angle side.

--- Description of "Focus" Mode --- The above-mentioned "focus" mode is a control mode for driving the autofocus mechanism 46, and the autofocus control contents are set to always perform autofocus operation. The above-mentioned “zoom” mode is set to {Full Auto} and {One Shot} which is set to operate autofocus until it is in focus or if it is not in focus. Executed or "Pan" mode or "Tilt" described later
After the mode is executed, the auto focus is performed for a predetermined time, and {time} is set to end with the control similar to {one shot}.

The above-mentioned {one-shot} control content is set to be executed independently, and after execution of this control content, it is set to return to the manual focus control state.

Here, although the auto focus is a convenient function, the focus motor 46A is always driven by executing the control contents of {full auto} described above. It becomes a problem in terms of mechanical life. However, although it constitutes one of the control characteristics in this embodiment, the autofocus is performed by performing the control contents of {time} described above, and thus the autofocus can be performed by "zoom", "pan",
Only when an operation such as “tilt” is executed and the image changes, the autofocus operation is automatically performed for a fixed time, and thereafter the autofocus operation is not performed. That is, by executing the {one shot} control content as needed while executing the {time} control content, the auto focus function substantially close to the {full auto} control content is achieved. This is achieved with the drive of the motor 46A being limited as much as possible.

In this way, in this embodiment, the driving time of the focus motor 46A is limited by the execution of the {time} control contents, and the autofocus mechanism 46 is always driven. The life of the autofocus mechanism 46 can be drastically extended as compared with the conventional configuration in which autofocusing is performed, and the durability of the surveillance camera 10 is improved to improve the reliability of the surveillance camera 10. It will be possible to improve.

On the other hand, the above-mentioned "focus" mode is
As a manual control content of the autofocus mechanism 46, when the focus position is directly specified and the focus motor 46A is controlled so that the focus lens moves to the specified focus position {focus setting}, the focus is set on the far side. When the focus motor 46A is controlled so as to move the focus lens 46A so that it is in focus {far}, when the focus motor 46A is controlled so that the focus lens is moved so that the focus is closer to the near side {close} , And {stop} for stopping the driven focus motor 46A.

The drive of the focus motor 46A is automatically stopped when the position of the focus lens reaches the moving range on the far side and the moving range on the near side. In addition, there is {ON / OFF} control content for switching between auto focus and manual focus. Auto focus control is executed with the control content specified when ON, and manual control is executed with the control content specified when OFF. Is configured to.

{Explanation of Control Operation of Tilt Mechanism 12 and Pan Mechanism 16} Next, referring to Table 2 below, a control mode of the tilt mechanism 12 and the pan mechanism 16 in the control section 18 will be described.

[0090]

[Table 2] --- Outline of Control Operation --- First, as shown in Table 2, the control unit 18 controls the tilt mechanism 1
The "tilt" mode is used as the control mode for the tilt motor 50 of the second embodiment, and the pan motor 100 of the pan mechanism 16
A "pan" mode is provided as a control mode for the. In the following description, the “tilt” mode and the “pan” mode refer to the tilt motor 50 and the pan motor 10 respectively.
Since only the extension direction of the drive axis of 0 is different and the control content is substantially the same, only the "pan" mode will be described.
The description of the “tilt” mode is omitted.

--Explanation of "Pan" Mode-- As described above, the "pan" mode is a control mode for driving and controlling the pan motor 100 of the pan mechanism 16, and the direction of the optical axis of the lens unit 36 is changed. When the pan motor 100 is set so that the lens unit 36 is set in the set direction and the pan motor 100 is set {pan position setting}, the pan motor 100 is driven so that the lens unit 36 rotates clockwise in plan view {clock Direction], the pan motor 100 is driven so that the lens unit 36 rotates counterclockwise in a plan view {counterclockwise}.
There are {stop} for stopping the driving of 0, control content for speed control, and control content for reset.

Here, as control modes relating to speed control, one speed control always operates at a predetermined speed set in advance, and a high speed / low speed is selectively driven depending on driving conditions [two speed control]. Control]. The control mode for this speed control is selected according to the control content of {same speed on / off} included in the "pan" mode. That is, in this {same speed on / off}, the control mode of [single speed control] is selectively set by being set to on, and is set to off in {same speed on / off}, Speed control] is selected and set.

In the "pan" mode described above, {high speed setting} for setting the high speed and {low speed setting for setting the low speed when the control mode of [two speed control] is selected. It further includes control contents for two types of speed setting such as "speed setting".

[Explanation of [two-speed control]] Next, referring to the flow chart shown in FIG. 12, the selection operation of high speed or low speed when the control mode of [two-speed control] is selected. Explain. First, when it is determined in step S40 that the tilt motor 50 or the pan motor 100 has been commanded to drive, it is determined whether the drive command is a command related to "preset" (step S42).

The drive command relating to the "preset" means that the lens unit 36 is tilted to a predetermined tilt by pressing a preset button (not shown) in a state where the tilt position and the pan position are preset (that is, preset). Tilt motor 50 to move to the pan and position
And a drive command for driving the pan motor 100.

If it is determined YES in step S42, that is, if the drive command is related to "preset", both the tilt motor 50 and the pan motor 100 are driven at a high speed. Select and set (step S44). Then, the tilt motor 50 is driven at the high speed set by the {high speed setting} in the "tilt" mode, and the pan motor 100 is driven by the high speed set by the {high speed setting} in the "pan" mode. Yes (step S46).

On the other hand, if it is determined NO in step S42 described above, that is, if the drive command is not related to "preset", then the drive command is set to {Pan position setting} described above. It is determined whether the command is a command regarding "tilt position setting" in the control content of (step S48).

If YES is determined in this step S48, that is, if the drive command is a command regarding "tilt position setting", the drive state for driving the tilt motor 50 at a high speed is selected and set. Yes (step S5
0). Then, subsequently, it is determined whether or not the drive command is a command regarding "pan position setting" in the control content of {pan position setting} (step S52).

If it is determined NO in step S52, that is, if it is determined that the drive command is only the command regarding "tilt position setting", the above-described step S52 is performed.
Proceeding to 46, only the tilt motor 50 is driven at the high speed set by {high speed setting} in the "tilt" mode.
On the other hand, if YES is determined in step S52 described above, that is, if the drive command is a command related to both “tilt position setting” and “pan position setting”, the pan motor 100 is driven at high speed. The driving state to be driven is selectively set (step S54), and the process proceeds to step 46 described above, and the tilt motor 50 and the pan motor 100 are driven at a high speed.

If it is determined NO in step S48 described above, that is, if the drive command is not a command regarding "tilt position setting", then the drive command is {pan position setting}. It is determined whether the command is a command regarding "pan position setting" in the control content (step S5).
6). If YES is determined in this step S56,
That is, when it is determined that the drive command is a command regarding "pan position setting", the process proceeds to step S54 described above, and the drive state for driving the pan motor 100 at a high speed is selected and set.

On the other hand, in step S56 described above, N
If it is judged to be O, that is, the drive command is “preset”
If it is determined that the tilt motor 50 is not related to "tilt position setting" or "pan position setting", the drive state for driving the tilt motor 50 at a low speed is selectively set ( Step S5
8) Then, a driving state for driving the pan motor 100 at a low speed is selectively set (step S60). And step S
Proceeding to 46, the tilt motor 50 is driven at the low speed set by the "tilt" mode {low speed setting}, and the pan motor 100 is driven at the low speed set by the "pan" mode {low speed setting}. To do.

That is, in this embodiment, the corresponding tilt motor 50 and / or the tilt motor 50 and / or the drive command is determined only when the drive command is determined to be a command related to “preset” or “pan position setting” or “tilt position setting”. Pan motor 1
00 is driven at a high speed, and if none of these “preset”, “pan position setting”, and “tilt position setting”, the corresponding tilt motor 50 and / or pan motor 100 should be driven at a low speed. become.

Note that {clockwise} and {counterclockwise} in the "pan" mode and {upward} and {downward} in the "tilt" mode are "preset" and "preset". Since it is neither "pan position setting" nor "tilt position setting", when these driving commands are issued, the driving state at low speed is automatically set.

As a result, according to this embodiment, when the movement destination, that is, the movement target position is set in advance like "preset" or "pan position setting" or "tilt position setting". The pan driving and / or the tilt driving are performed at high speed, and thus the driving time can be shortened. On the other hand, when the lens unit 36 is pan-driven and / or tilt-driven without defining the destination, as in {clockwise} or {counterclockwise}, the lens unit 36 should be driven at a low speed. Therefore, in the case where a deviation occurs between the actual pointing direction of the lens unit 36 and the projected image due to the information transfer time or the like, this deviation can be suppressed to a minimum and the operability is improved. Can be improved.

That is, in this embodiment, the operator who remotely operates the surveillance camera 10 presets the lens unit 36 by, for example, pressing a preset button when panning and / or tilting the surveillance camera 10. When moving to a position, the lens unit 36 moves to a preset position at a high speed by simply pressing the preset button without paying attention to the drive speed or setting the drive speed at all. It will be. In addition, for example, in order to track a suspicious person shown in the surveillance camera 10 by pressing a button instructing {clockwise} and driving the lens unit 36 to pan clockwise,
The lens unit 36 is pan-driven in the clockwise direction at a low speed by simply pressing the button for instructing {clockwise} without paying any attention to the driving speed or setting the driving speed. Will be.

As described above, in this embodiment, the drive speed optimal for the drive state is predetermined, so that the operator does not have to be aware of the drive speed or set the drive speed. It is possible to work and improve workability.

--- Description of Reset Operation-- As the control contents relating to the above-mentioned reset, there are two types of total of {position reset} regarding the position of the lens unit 36 and {speed reset} regarding the drive speed of the lens unit 36. There is control content. Here, as shown in Table 2, by setting {position reset}, the position of the lens unit 36 is initialized, and accordingly, the lens unit 36 moves in the tilt direction in the [tilt] mode. It is configured to be forcibly moved to the center position of the drive range, or to the center position of the drive range in the pan direction in the "pan" mode.

In addition, by setting {speed reset}, the tilt motor 5 can be operated in the "tilt" mode.
In addition to forcibly setting the driving speed of 0 to the initial setting value, the two speed control state is not set, and in the "pan" mode,
The drive speed of the pan motor 100 is forcibly set to an initial set value, and a dual speed control state is set.

The conventional video signal, the zoom lens, the tilt mechanism 12, and the pan mechanism 16 are controlled by an overall control device such as a host computer so that a plurality of control commands are sent in one command statement. Although configured, the surveillance camera 10 in this embodiment is configured to be capable of simultaneously executing a plurality of commands.

--- Description of Other Modes-- In addition to the above-mentioned various modes, the control modes of the control unit 18 include "preset" mode, "tracking" mode, "status request" mode, and "timer". There is a control mode such as ".

--- Explanation of "Preset" Mode --- Here, the "preset" mode includes {designated control} for designating the control state in advance and {execution control} for controlling to the designated state. A plurality of {designated control} and {execution control} can be performed by assigning preset numbers. Further, although it is possible to specify control of all modes with one preset number, it goes without saying that it is not necessary to specify all. In addition, the control in the unspecified mode is configured to continue the previous state when the "execution control" is performed.

As the {designation control}, the first method of instructing the control of the mode to be designated after the preset number from the host computer 124 or the like and the state of the surveillance camera 10 itself according to desired setting conditions There are roughly two methods, that is, the second method of designating the preset number. The second method is designed so that the mode to be set can also be designated. This is convenient for use when only the pan / tilt position is desired to be specified.

--- Explanation of "Tracking" Mode-- In the above-mentioned "tracking" mode, when monitoring is performed by a plurality of monitoring cameras 10, 10A, 10B ,. By moving the surveillance position, the other cameras are in a control mode that is set to follow and move so that the surveillance position can be displayed.

In the "tracking" mode, the designation of the surveillance cameras to be a group, the group number, the camera coordinates, etc. are set in advance. Here, a group is a surveillance camera that you want to point in the same direction as the surveillance camera when the pan / tilt position of any surveillance camera in the group is changed, or the pan / tilt position of the cameras at the same time. Etc. is defined as a set of cameras that are desired to operate. That is, when trying to execute the monitoring reliably, a large number of monitoring cameras are used in a wide monitoring range, and therefore, the groups (collections) of the monitoring cameras to be tracked together differ depending on the installation location. . A group number is required to handle a large number of groups even if one surveillance camera is used, depending on the direction in which the group belongs and the number of locations to which the group belongs. Becomes

Next, a method of setting coordinates in the "tracking" mode will be described with reference to FIG.

Here, if the inside of the room is to be monitored, the origin of the coordinates is set at one corner of the room. Positions C1 and C of each surveillance camera with respect to this origin
The coordinates C2 and C3 are set for each surveillance camera. For example, in the case of the first monitoring camera 10, C1 (x1, y
1, z1), if the second monitoring camera 10A, C2
(X2, y2, z2) and C3 (x3, y3, z3) are set for the third monitoring camera 10B, respectively.

Next, the position C1 of the first surveillance camera 10 is set in the telephoto state to the position P1 whose coordinates are known in advance,
The coordinates of the position P1 and a completion signal of the alignment operation are sent to the monitoring camera 10. At this time, with respect to the first monitoring camera 10, an angle θ with respect to the center position (reset position) A in the pan direction and the center position (reset position) B in the tilt direction.
For each angle φ. Then, the actual mounting position of the first monitoring camera 10 is calibrated by calculation from the coordinates of the position C1 and the position P1 described above. This setting procedure is performed at the same coordinates for a plurality of surveillance cameras in the same group.

Next, the tracking operation will be described.

In this tracking operation, 1 in the group
Surveillance cameras are in "Pan" mode and "Tilt"
Mode. From the operating or operating monitoring camera, another monitoring camera or the host computer 1 can use the subject position of the image as coordinate information at any time.
Send to 24. The subject position of the image is obtained by a predetermined calculation by knowing the direction from the pan / tilt position and the distance from the focus position of the focus lens of the lens unit 36. The other surveillance camera which has received the coordinate information of the subject position of the image calculates the pan and tilt positions, operates the tilt mechanism 12 and the pan mechanism 16, and moves the lens unit 36. In this way, the tracking operation is executed.

At this time, the distance of the subject position from the monitoring camera 10 can be set by obtaining the position of the focus lens, but the "focus" mode is {auto}. Further, since there is an error in the distance calculation depending on the focus position of the focus lens, and since there is an autofocus function, this {auto} function is used.

In the "tracking" mode, position presetting can also be executed. This preset operation is performed by specifying the position number and coordinates for each group, or by directing the corner monitoring camera to that position. The operation is executed by designating the position number to the group --- Explanation of "status request" mode --- The above "status request" mode is for the host computer 124 to know the control state of the surveillance camera. Is the mode. That is, the state of each control mode, shutter speed,
The host computer 124 can know the aperture value, video gain, exposure correction value, zoom value, focus position, pan position, tilt position, preset setting state, group setting state, and the like. Needless to say, these values can be known collectively or individually.

--- Explanation of "Timer" Mode --- The "timer" mode described above means that the surveillance camera 10 is automatically started and / or stopped at a predetermined time every day, or on a predetermined day (for example, a holiday). It is a mode in which the camera 10 can be automatically started and / or stopped at a predetermined time. In this "timer" mode,
Through the input device (not shown),
The start time and stop time are entered.

[Explanation of Modifications] Needless to say, the present invention is not limited to the configuration of the above-described embodiment and can be variously modified without departing from the scope of the present invention.

For example, in the above-described embodiment, the case where the pan-tilt camera of the present invention is applied to the surveillance camera has been described, but the present invention is not limited to such an application, and it is not limited to such an application and can be used for video conferences and computers. It can also be used as a camera for inputting images, etc., and the point is that it can be applied to all types of cameras capable of pan driving and tilt driving.

{Explanation of First Modification} In the above-described embodiment, the lens unit 36 is rotationally driven about 90 degrees between the horizontal position and the vertical position in the tilt direction. However, the present invention is not limited to such a configuration, and as shown in FIG. 14 as a first modified example, the lens unit 36 is attached to the mounting surface with respect to the mounting surface. It is rotationally driven by approximately 90 degrees between an obliquely downward position inclined by 45 degrees obliquely downward and an oblique upward position inclined by 45 degrees obliquely upward with respect to the mounting surface as indicated by a broken line. It may be configured to.

In this case, the dead space is the support shaft 40.
The connecting pieces 34C of the mounting frame 34 are placed above and below the support shafts 40A and 40B, respectively.
Will be respectively disposed in the dead spaces located below the support shafts 40A and 40B.

{Explanation of Second Modification} In the above-described embodiment, the dome-shaped cover 24 is described as being fixed to the open upper portion of the cylindrical cover 26.
The present invention is not limited to such a configuration, and may be attached in a state of being connected to the rotary table 76, for example. With this structure, the dome-shaped cover 24 and the lens unit 36 move relative to each other only in the tilt direction. As a result,
As shown as a second modified example in FIG. 15, the dome-shaped cover 24 ′ is configured to protrude in an arc shape only along the tilt direction so as to allow only the movement of the lens unit 36 in the tilt direction. You will be able to do it.
The shape of such a dome-shaped cover 24 'is extremely unique, and, for example, the installation of this surveillance camera 10 should be clearly shown to the person being monitored, and an implicit indication that it is being monitored is given. 15 is used, a dome-shaped cover 24 'having a shape as shown in FIG. 15 is used, and when it is not desired to let the monitored person know what is being monitored, it is conspicuous as shown in the figure. A dome-shaped cover 24 having no shape may be used.

[0128]

As described in detail above, according to the first aspect of the present invention, the pan-tilt camera according to the present invention has a camera body which is arranged so as to be panable around an axis perpendicular to the mounting surface of the pan-tilt camera. , A pan unit for pan-driving the camera body, the camera body being provided with a lens unit tiltably arranged around an axis parallel to the mounting surface, and for tilt-driving the lens unit. And tilting means of the.

According to the second aspect of the pan / tilt camera of the present invention, the lens unit and the tilting means for tilt-driving the lens unit about the axis parallel to the mounting surface of the pan / tilt camera. And a pan unit for driving the camera body to pan around an axis perpendicular to the mounting surface.

According to the third aspect of the pan / tilt camera of the present invention, the camera body is fixed to the video circuit board, and the lens unit is mounted so as to be tiltable. And a mounting frame.

According to the fourth aspect of the pan / tilt camera of the present invention, the lens unit is
It is characterized in that it is rotatably supported by the mounting frame at least at a substantially central portion in the longitudinal direction.

According to a fifth aspect of the pan-tilt camera of the present invention, the camera body is provided with a tilt drive source mounted on the mounting frame.

According to the sixth aspect of the pan / tilt camera of the present invention, the tilt drive source is arranged in a dead space outside the range of actual rotation of the lens unit. It is characterized by being installed.

According to a seventh aspect of the pan / tilt camera according to the present invention, the camera body is housed in a storage container, and a tilt drive mounted on a mounting member fixed in the storage container. It is characterized by having a source.

According to the eighth aspect of the pan-tilt camera of the present invention, the drive source is an electric motor.

According to a ninth aspect of the pan-tilt camera of the present invention, the camera body is housed in a storage container, and the storage container has a control means for controlling the pan-tilt camera. The mounted control board is attached, and the tilting means is electrically connected to the control board via the video circuit board.

Further, in the pan-tilt camera according to the present invention, according to the tenth aspect, the video circuit board and the control board are flexible cables that pass through the inside of the container along the central axis of the pan-tilt camera. It is characterized in that they are electrically connected to each other through.

According to the eleventh aspect of the pan / tilt camera of the present invention, the camera body is housed in a housing container, and the pan means is mounted on a mounting member fixed in the housing container. A pan drive source, a pan base fixed above the mounting member in a state of being separated from each other, and a pan base fixedly rotatably supported on the pan base via a first thrust bearing. A rotary table to be placed, a support shaft fixed to the rotary table, penetrating and projecting a central portion of the pan base toward the mounting member, and a driven gear fixed to a projecting end of the support shaft, A second thrust bearing provided between the driven gear and the rotary base and a driving force transmission means for transmitting the driving force of the pan drive source to the driven gear are provided. .

According to a twelfth aspect of the pan-tilt camera of the present invention, the second thrust bearing is in rolling contact with the driven gear and the rotary base at the same time.
Multiple bearing balls that allow relative rotation of both,
It is characterized by including a retainer for preventing the bearing balls from falling off.

Therefore, according to the present invention, it is possible to provide a pan-tilt camera which can be downsized as a whole by unitizing it.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of an embodiment of a pan-tilt camera according to the present invention when applied to a surveillance camera.

FIG. 2 is an exploded perspective view showing the configuration of an embodiment of the surveillance camera shown in FIG.

FIG. 3 is a block diagram showing a configuration of a control system provided in the surveillance camera shown in FIGS. 1 and 2 in an extracted manner.

FIG. 4 is a side view schematically showing a rotation range of a camera unit in the camera body.

FIG. 5 is a front view schematically showing a mounting state of a tilt motor and a tilt position detection mechanism on a mounting frame.

FIG. 6 is a plan sectional view showing a state in which a main flexible flat cable is taken out from a spindle.

FIG. 7 is a plan view showing a specific shape of a notch formed in the support shaft in an enlarged state.

8 is a plan sectional view showing a state in which the support shaft is rotated counterclockwise from the position shown in FIG.

FIG. 9 is a block diagram schematically showing a connection mode in which a host computer and a monitoring camera group are connected in a loop.

10 is a block diagram schematically showing a configuration of a modified example in which a host computer and a surveillance camera group are connected in a connection mode different from the connection mode shown in FIG.

FIG. 11 is a flowchart showing a control procedure for executing automatic exposure control.

FIG. 12 is a flowchart showing a control procedure for executing two-speed control.

FIG. 13 is a diagram showing coordinate setting in the tracking mode.

FIG. 14 is a side view schematically showing a configuration of a first modified example regarding a tilted state of the lens unit.

FIG. 15 is a perspective view showing a configuration of a second modification of the dome-shaped cover.

[Explanation of symbols]

 10 Surveillance Camera (Pan Tilt Camera) 10A; 10B Other Surveillance Camera 12 Tilt Mechanism 14 Camera Body 16 Pan Mechanism 18 Control Unit 20 Power Supply Unit 22 Main Board 24 Dome Cover 26 Cylindrical Cover 28 Opening 30 Video Circuit Board 32 Spacer 34 Mounting Frame 34A; 34B Standing Piece 34C Connecting Piece 36 Lens Unit 38 Camera Connecting Cable 40A; 40B Spindle 42 Power Zoom Mechanism 42A Zoom Motor 44 Auto Iris Mechanism 44A Iris Motor 46 Auto Focus Mechanism 46A Focus Motor 48 CCD Sensor 50 Tilt Motor 50A Motor shaft 52 Drive side pulley 54 Driven side pulley 56 Endless belt 58 Tilt position detection mechanism 60 Tilt gear 62 Tilt rotation amount detection unit 62A Detection Vehicle 64 Flexible cable for tilt position detection 66 Flexible cable for tilt motor control 68 Main flexible flat cable 70 Mounting base 72 Strut 74 Pan base 76 Rotating table 78 Spacer 80 Upper thrust bearing 82 Opening 84 Opening 86 Opening 88 Spindle 90 Driven gear 92 Lower thrust bearing 92A Bearing ball 92B Retainer 94 Flexible cable guide 96 Notch 98 Slit 100 Pan motor 100A Motor shaft 102 Drive gear 104 Transmission gear 104A Helical gear 104B Spur gear 106A First intermediate gear 106B Second intermediate gear 108 Pan Position detection mechanism 110 Pan gear 112 Extraction gear 114 Pan rotation amount detection unit 114A Detection gear 116 CCD drive circuit 1 8 sample hold circuit 120 zoom position detection mechanism 122 focus position detection mechanism 124 host computer 126A to 126D connection cable 128 wire cable 130A; 130B support stand 132 mounting frame 134 auxiliary plate 136A; 136B arcuate groove 138A; 138B guide pin 140 Coil spring 142 rack and pinion mechanism 142A rack 144 wire tube

Claims (12)

[Claims] 1. A pan / tilt camera comprising: a camera main body that is arranged to be panable around an axis orthogonal to a mounting surface of the pan / tilt camera; and pan means for pan-driving the camera main body. A pan-tilt camera, comprising: a lens unit arranged so as to be tiltable around an axis parallel to a mounting surface; and tilting means for tilt-driving the lens unit. 2. A lens unit, a camera body having a built-in tilting means for tilt-driving the lens unit around an axis parallel to a mounting surface of a pan-tilt camera, and the camera body being perpendicular to the mounting surface. Pan-tilt camera, which comprises: 3. The camera body comprises: a video circuit board; and a mounting frame fixed on the video circuit board and having the lens unit mounted in a tiltable manner. The pan-tilt camera described in 2. 4. The pan-tilt camera according to claim 3, wherein the lens unit is rotatably supported by the mounting frame at least at a substantially central portion in the longitudinal direction. 5. The pan-tilt camera according to claim 3, wherein the camera body includes a tilt drive source mounted on the mounting frame. 6. The tilt drive source is arranged in a dead space outside the range of actual rotation of the rotatable range of the lens unit.
Pan-tilt camera described in. 7. The pan-tilt camera according to claim 3, wherein the camera body is housed in a storage container, and includes a tilt drive source mounted on a mounting member fixed in the storage container. 8. The pan-tilt camera according to claim 5, wherein the drive source is an electric motor. 9. The camera body is housed in a storage container, and a control board having control means for controlling a pan-tilt camera is mounted in the storage container, and the tilt means is the video circuit. The pan-tilt camera according to claim 3, wherein the pan-tilt camera is electrically connected to the control board via a board. 10. The video circuit board and the control board are electrically connected to each other through a flexible cable penetrating the inside of the container along the central axis of the pan-tilt camera. Item 9. The pan-tilt camera according to item 9. 11. The camera body is housed in a storage container, and the pan means is separated from a pan drive source mounted on a mounting member fixed in the storage container and above the mounting member. A pan base fixed in this state, a rotary base rotatably supported on the pan base via a first thrust bearing, on which the video circuit board is mounted, and a pan fixed to the rotary base. A support shaft penetrating and protruding from the central portion of the base toward the mounting member, a driven gear fixed to a projecting end of the support shaft, and a second gear interposed between the driven gear and the rotary base. 4. The pan-tilt camera according to claim 3, further comprising: a thrust bearing, and a driving force transmitting unit that transmits the driving force of the pan driving source to the driven gear. 12. The second thrust bearing includes a plurality of bearing balls that are in rolling contact with the driven gear and a rotary base at the same time to allow relative rotation between the two, and a retainer that prevents the bearing balls from falling off. The pan / tilt camera according to claim 11, wherein: