JPH11258653A - Monitoring camera lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring camera lens device where a diaphragm is manually adjusted by remote operation, if diaphragm adjustment by automaticx adjustment (automatic iris) is not suitable, by executing the changeover of the automatic adjustment (automatic iris) and the manual adjustment of the diaphragm. SOLUTION: An iris controlling motor 38 is automatically driven by an automatic iris circuit 40 so as to set the brightness of a video signal to be proper by inputting the video signal from a camera 12 to the automatic iris circuit 40 in the case of executing the automatic adjustment of the diaphragm by the automatic iris at a lens device. When an iris selection signal to instruct the manual adjustment of the diaphragm is inputted from a controller 16, the connection of the iris controlling motor 38 is switched from the automatic iris circuit 40 to the side of the controller 16 by switching the switches S1 and S2 of a switch circuit 44. Thus, the diaphragm adjustment is executed by the controller 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens apparatus for a surveillance camera, and more particularly to a lens apparatus for a surveillance camera capable of switching aperture adjustment between automatic and manual (remote operation).

[0002]

2. Description of the Related Art Conventionally, a lens device used in a surveillance camera is configured so that a monitor can adjust focus, zoom, aperture, and the like by a controller placed in a surveillance room. Some apertures use an auto iris that inputs a video signal from a surveillance camera and automatically controls the brightness of the video signal.

In a lens device using an auto iris, it is not necessary for the observer to adjust the aperture according to the brightness of the subject, so that the operation time is reduced.

[0004]

However, in the case of an auto iris, the subject may be darkened in a shooting situation such as a backlight. In such a case, in the conventional lens device using the auto iris, since the aperture could not be adjusted from the controller, there was a problem that the brightness of the subject could not be corrected and the object could not be properly recognized. there were.

The present invention has been made in view of the above circumstances, and provides a lens apparatus for a surveillance camera in which the aperture can be manually adjusted by remote operation when the aperture adjustment by an auto iris is not appropriate. With the goal.

[0006]

In order to achieve the above object, the present invention provides a surveillance camera lens device which is used in a surveillance camera and which adjusts the aperture by a motor. Automatic aperture control means for automatically controlling the motor based on the brightness of the subject detected by the luminance detection means, and manual aperture control for controlling the motor based on a control signal input from a manually operated operation unit Means, and an aperture adjustment switching means for switching the control of the motor to the automatic aperture adjustment means or the manual aperture adjustment means.

According to the present invention, the automatic iris adjusting means (auto iris) and the manually operable iris manual adjusting means can be selectively switched to be used.
The aperture can be appropriately corrected by manual operation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a surveillance camera lens device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a surveillance camera system using a surveillance camera lens device according to the present invention. As shown in the figure, a lens device 10 according to the present invention is used by being attached to a small camera 12 for monitoring. A monitor 14 is connected to the camera 12, and an image formed on the imaging surface of the camera 12 via the lens device 10 is output to the monitor 14 as a video signal, and the image is displayed on the monitor 14. It is being projected.

The lens device 10 includes a controller 1
6 is connected via a cable 17. Controller 1
6 is provided with a focus operation lever 18, a zoom operation lever 20, an iris operation lever 22, an iris selection switch 24, and the like.
When the zoom operation lever 20 is operated, a control signal based on the operation is transmitted from the controller 16 to the lens device 10, and the focus lens and the zoom lens of the lens device 10 are moved based on the control signal. Thereby, the focus adjustment and the zoom adjustment of the lens device 10 can be remotely operated from the controller 16.

When the iris selection switch 24 of the controller 16 is operated (on / off), it is possible to switch between automatic adjustment of the iris (auto iris) and manual adjustment. When automatic adjustment is selected by the iris selection switch 24, the lens device 10 inputs a video signal from the camera 12, and automatically adjusts the aperture so that the brightness of the video signal is appropriate. On the other hand, when manual adjustment is selected by the iris selection switch 24, manual adjustment of the iris by the iris operation lever 22 is enabled. When the iris operation lever 22 is operated, a control signal based on the operation is transmitted to the lens device 10, and the control is performed. The diaphragm device of the lens device 10 is driven based on the signal. Accordingly, when the iris is automatically adjusted by the auto iris, when the subject is dark and the target object cannot be recognized due to backlight, the iris operation lever 22 of the controller 16 is appropriately operated, and the iris is manually operated. Can be modified.

FIG. 2 is a circuit diagram showing an embodiment of the lens apparatus 10 which can be used by switching between automatic adjustment and manual adjustment of the aperture. As shown in the figure, the lens device 10 is connected to the camera 12 by an auto iris connector 30 and is connected to the controller 16 by a control signal input connector 32. The power line L1, the video line L2, and the GND line L3 are allocated to the auto iris connector 30, and the lens device 10 receives the power of + V from the camera 12 through the power line L1 and also receives the power of + V from the camera line 12. Video signals are input.

The control signal input connector 32 includes:
The focus control line L4, the zoom control line L5, the iris control line L6, the iris selection line L7, and the common line L8 are allocated, and the focus operation lever 18, the zoom operation lever 20, and the iris operation lever 22 (see FIG. 1) of the controller 16 are assigned. The focus control signal, the zoom control signal, and the iris control signal based on the operation are respectively a focus control line L4 and a zoom control line L.
5, input to the lens device 10 through the iris control line L6.

Further, based on a selection operation of the iris selection switch 24 of the controller 16, an iris selection signal of ON and OFF (H level and L level) is inputted to the lens device 10 through an iris selection line L7. I have. The lens device 10 includes a focus control motor 34, a zoom control motor 36, an iris control motor 38 for driving a focus lens, a zoom lens, and an aperture device, respectively, and an iris control motor 3 for auto iris.
An iris selection circuit 42 and a switch circuit 44 for switching between aperture control by the auto iris circuit 40 and aperture control by an iris control signal that can be input from the controller 16 are provided.

The focus control motor 34 is connected to the focus control line L4 of the control signal input connector 32.
And a common line L8, and is driven by a focus control signal input from the controller 16. Therefore, by operating the focus operation lever 18 of the controller 16, the focus control motor 34 can be driven to move the focus lens.

The zoom control motor 36 is connected to the zoom control line L5 and the common line L8 of the control signal input connector 32, and is driven by a zoom control signal input from the controller 16. Therefore, by operating the zoom operation lever 20 of the controller 16 similarly to the focus control motor, the zoom control motor 36 can be driven to move the zoom lens.

The iris control motor 38 includes a switch
The control signal input connector 32 through the circuit 44;
Control line L6 and common line L8, or auto eye
The squirrel circuit 40 is connected. switch
The circuit 44 is a relay switch and an iris selection circuit.
42 to the coil 44A of the switch circuit 44.
The switches S1 and S2 are connected to the contact a
₁, A_TwoOr contact b ₁, B_TwoSwitch to
ing. The circuit operation of the iris selection circuit 42
Will be described later.

When the switches S 1 and S 2 of the switch circuit 44 are connected to the contacts a ₁ and a ₂ , the iris control motor 38 is connected to the auto iris circuit 40. The auto iris circuit 40 is connected to the auto iris connector 3.
0, a power line L1, a video line L2, and a GND line L3. Power is supplied from the power line L1 and a video signal is input from the camera 12. The auto iris circuit 40 detects the brightness of the subject from the input video signal, and outputs a control signal to the iris control motor 38 to drive the iris control motor 38 so that the brightness becomes appropriate. Thus, the aperture is automatically adjusted by the auto iris.

On the other hand, the switches S1 of the switch circuit 44,
S2 is the iris control motor 38 when it is connected to the contact b _1, b ₂ are connected to the iris control line L6 and the common line L8 of the operation signal input connector 32, driven by an iris control signal inputted from the controller 16 Will be done. Therefore, when the switches S1, S2 of the switch circuit 44 is connected to contact b _1, b _2,
The operation of the iris operation lever 22 (see FIG. 1) of the controller 16 becomes effective, and the iris control motor 38 is driven by the iris operation lever 22 of the controller 16 so that the aperture can be manually adjusted.

Next, the circuit operation of the iris selection circuit 42 will be described. The iris selection circuit 42 inputs an iris selection signal from the iris selection line L7 of the control signal input connector 32. When the iris selection switch 24 (see FIG. 1) of the controller 16 has selected the automatic adjustment, the iris selection circuit 42 supplies the L level (0
The iris selection signal V) is input. In this case, since the photodiode 46A of the photocoupler 46 of the iris selection circuit 42 does not emit light, the phototransistor 46B of the photocoupler 46 is turned off. When the phototransistor 46B is off, the base voltage of the transistor 48 becomes H level by the voltage applied from the power supply line L1, and the transistor 48 turns on. As a result, a current flows through the coil 44A of the switch circuit 44 connected between the power supply line L1 and the collector of the transistor 48, so that the switches S1 and S2 of the switch circuit 44
Are connected to the normally open contacts a ₁ and a ₂ , and the iris control motor 38 is driven by the auto iris circuit 40 as described above.

On the other hand, when the iris selection switch 24 (see FIG. 1) of the controller 16 selects the manual adjustment, the iris selection circuit 42 receives an H level iris signal. In this case, since the photodiode 46A of the photocoupler 46 of the iris selection circuit 42 emits light, the phototransistor 46B of the photocoupler 46 is turned on. When the phototransistor 46B is on, the base voltage of the transistor 48 goes low, and the transistor 48 turns off. Thus, since the coil 44A of the switch circuit 44 a current is not supplied, the switch S1, S2 of the switch circuit 44 is connected to the contact b _1, b ₂ of the normally closed side, an iris control motor 38 the controller as described above It is driven by the iris control signal input from the control signal 16.

First, when the iris selection switch 24 shown in FIG. 1 is selected for automatic adjustment (auto iris), the controller 16 sends the iris selection circuit 42 of the lens apparatus 10 to the iris selection circuit 42 of the lens apparatus 10. An L level iris selection signal is input. When an L-level iris selection signal is input, the iris selection circuit 42
To the switches S1 and S2 of the switch circuit 44
Are connected to the contacts a ₁ and a ₂ , respectively. This allows
The iris control motor 38 is connected to an auto iris circuit 40, and the iris control motor 38 is automatically controlled by the auto iris circuit 40. That is, the aperture is automatically adjusted.

On the other hand, when the iris selection switch 24 shown in FIG. 1 is switched to manual adjustment, an H level iris selection signal is input from the controller 16 to the iris selection circuit 42 of the lens device 10. Iris selection circuit 42
, When the iris selection signal of H level is inputted, so as not to flow a current to the coil 44A of the switch circuit 44 connects the switch S1, S2 of the switch circuit 44 to the contact b _1, b _2, respectively. As a result, the iris control motor 38 is connected to the iris control line L6, and the iris control motor 38 is controlled by the iris control signal input from the controller 16. That is, the iris is manually adjusted by the iris operation lever 22 of the controller 16.

Thus, the lens device 10 according to the present invention
Is possible to adjust the aperture by operating the auto iris and the controller 16. For example, in a case where the aperture is adjusted by the auto iris in a backlight situation and the like, the image is dark and the target object cannot be determined. Switching to manual adjustment allows the iris to be properly modified using the controller 16.

In the above-described embodiment, the automatic iris circuit 40 for automatically controlling the iris control motor 38 includes:
The connection with the controller 16 that performs manual control of the iris control motor 38 is switched by the iris selection circuit 42 and the switch circuit 44 to switch between automatic adjustment of the iris (auto iris) and manual adjustment.
A CPU is mounted on the lens device 10 and the CPU controls the iris control motor 3 for both automatic adjustment and manual adjustment.
8 may be controlled. In this case, the CPU inputs a video signal from the camera 12 and
An operation signal of the iris operation lever 22 is input from 6.
Then, it detects whether the selection of the iris selection switch 24 is automatic adjustment or manual adjustment, and controls the iris control motor 38 based on either the video signal or the operation signal according to the selection.

In the above embodiment, the brightness of the subject is detected from the video signal by the auto iris, and the aperture is automatically adjusted based on the detection result. However, the method of detecting the brightness of the subject is as follows. The present invention is not limited to this, and other methods may be used, and the autofocus method is not limited to the above embodiment.

[0026]

As described above, according to the lens apparatus for a surveillance camera according to the present invention, the automatic iris adjusting means (auto iris) and the manually operable iris adjusting means can be selectively switched and used. Therefore, even when the aperture adjustment by the auto iris is not appropriate, the aperture can be appropriately corrected by manual operation. Thereby, for example, even when the subject is darkened by the auto iris and the target object cannot be properly recognized in a shooting situation such as a backlight, the target object can be appropriately recognized by manually adjusting the aperture from the controller. Become.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a surveillance camera system using a surveillance camera lens device according to the present invention.

FIG. 2 is a circuit configuration diagram showing an embodiment of a lens device which can be used by switching between automatic adjustment of a diaphragm and manual adjustment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lens device 12 ... Camera 14 ... Monitor 16 ... Controller 34 ... Focus control motor 36 ... Zoom control motor 38 ... Iris control motor 40 ... Auto iris circuit 42 ... Iris selection circuit 44 ... Switch circuit

Claims (1)

[Claims] 1. A surveillance camera lens device used for a surveillance camera and adjusting an aperture by a motor, comprising: a brightness detection unit for detecting brightness of a subject; and a brightness detection unit configured to detect a brightness of the subject based on the brightness detected by the brightness detection unit. Automatic iris adjusting means for automatically controlling the motor, manual iris adjusting means for controlling the motor based on a control signal input from a manually operated operation unit, and controlling the motor to the automatic iris adjusting means or A lens device for a surveillance camera, comprising: aperture adjustment switching means for switching to manual aperture adjustment means.