JP3381308B2 - Surveillance camera device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera device.

[0002]

2. Description of the Related Art Conventionally, CCTV cameras (hereinafter, simply referred to as cameras) for surveillance purposes are usually adjusted by an operating device installed in a remote place. Such adjustments include perspective adjustment of the angle of view, focus adjustment, horizontal (pan) adjustment of the camera,
There is vertical (tilt) adjustment. In order to adjust the perspective of the angle of view and the focus adjustment, a control signal for driving the zoom motor and the focus motor is transmitted from the operation device in order to adjust the position of the movable lens. In a conventional camera, such adjustment is performed using a so-called front lens. Further, the pan adjustment and the tilt adjustment have been performed by transmitting a control signal from the operation device to a camera base that is provided with a servo motor and is rotatable in the horizontal and vertical directions.

A communication line for transmitting a control signal from an operating device located at a remote place also serves as a power supply line for supplying power to the camera to reduce the system cost. FIG. 2 shows a conceptual diagram of power supply in a conventional surveillance camera device. This is because the motor driven by each control signal only needs to operate when the control signal is issued, and it is not necessary to supply power even when it does not operate. That is, for example, when adjusting the perspective angle of view, between the focus control line and the common line, and applying a positive or negative DC voltage, Four
By rotating the waste motor forward or reverse,
Adjusting perspective .

However, the camera with the front lens is downsized,
Since it is difficult to reduce the weight and requires a compensator lens, it is necessary to use a sturdy camera base, and the servo motor must also have a large capacity, which increases costs. It was a factor.

As a countermeasure against this, a proposal has been made to use a camera using an inner focus lens.

FIG. 3 is a diagram showing the structure of an inner focus lens for movies. In FIG. 3, the first group lens 31 and the third group lens 33 are fixed to a lens barrel 35. Two
The group lens 32 (angle of view lens) is a D for driving the second group lens.
In response to the rotation of the C motor 36, the second group screw rod 42 coupled to the C motor 36 via a gear slides back and forth along the second group guide rod 41, and at the time of Wide, the front position 32a, Tel.
At the time of e, it moves to the rear position 32b. 4th group lens 34
The (focus lens) is a fourth group screw rod 44 directly connected to the stepping motor 37 for driving the fourth group lens in accordance with the rotation thereof.
Slides back and forth, and at the time of Near, the front position 34
At the time of a and Far, it moves to the rear position 34b.

The position of the second lens group 32 can be detected by the slide volume 38,
The so-called zero point position of the fourth group lens 34 is detected by the photo sensor 39.

After such adjustment, the first group lenses 31 and 2
The image pickup optical signal that has passed through the group lens 32 is narrowed to an appropriate light amount by the diaphragm 40, passes through the third group lens 33 and the fourth group lens 34, and then passes through the optical filter 45 and the image pickup element CCD 46.
Entered in.

The inner focus lens does not require a compensator lens between the second lens group 32 and the third lens group 33 as compared to the front lens focus lens, and the first lens group 31 can be fixed to the lens barrel 35. Can be However, it is necessary to control the position using a microcomputer so that the focus does not move during zooming.

FIG. 4 is a 2-group / 4-group correlation diagram showing a characteristic curve showing the proper 4-group position with respect to the 2-group lens position. Further, FIG. 5 is a block diagram of a conventional control system for controlling the inner focus lens shown in FIG. Figure
5 , the microcomputer 21 has a built-in RA
The calculation is performed by M22, the second group motor 25 (DC motor 36 in FIG. 3) is driven by the DC motor driver 23, the second group position is detected by the potentiometer 27 (slide volume 38 in FIG. 3), and the result is fed back to the microcomputer.

Further, the stepping motor driver 24 is used to drive the fourth group motor 26 (stepping motor 3 in FIG. 3).
7) to drive the position of the fourth lens group to the zero point detecting means 28.
(Photo sensor 39 in FIG. 3) and the number of steps. Here, when the Tele / Wide switch 30 is pressed, the second lens group position moves in that direction, and accordingly, the fourth lens group position is moved based on the second lens group / fourth lens group correlation diagram (FIG. 4) . (For example, if the subject distance is 2 m, the second group and the fourth group are moved based on the correlation diagram of 2 m.) N
When the ear / Far switch 29 is pressed, the contents of the RAM 22 are moved up / down in that direction, and the second group-4
Only 4 groups are moved based on the group correlation diagram. (For example, when changing the subject distance from 2 m to 1 m, the position of the second group is detected and only the fourth group is moved based on the correlation diagram of 1 m.) Therefore, even with the conventional movie inner focus lens, during zooming. You can prevent the focus from moving, and you can change the subject distance to focus without the focus ring.

[0012]

However, in the technique proposed above, the size of the camera can be reduced by adopting the inner focus lens as the surveillance camera, but the surveillance camera is similar to that for movies. No dedicated power supply line is provided and the microcomputer is not always supplied with power.
That is, as noted above, since it is the power supply only during the adjustment of the angle of view or focus, since the operation of the operation device power supplied is also turned off the microcomputer at the moment when turned off, sufficient There was a problem that the control operation could not be performed. Further, when the angle of view and the focus are operated at the same time, a power supply short circuit may occur depending on the polarity of the power supplied from the operating device.

Further, due to the characteristics shown in FIG. 4, the data for determining the proper position of the second group lens according to the position of the fourth group lens is erased after each operation, so that accurate adjustment cannot be performed. There is a risk.

The present invention solves the above-mentioned problems of the prior art, and enables excellent control operation, and excellent monitoring that the data of the position of the fourth lens group is not lost at the end of the operation. An object of the present invention is to provide a camera device for use.

[0015]

In order to achieve the above object, the present invention provides, as a first invention, an angle-of-view lens for adjusting the perspective of the angle of view in accordance with the sliding position, and a sliding position. A focus lens that adjusts focus according to the focus angle, a view angle lens driving unit that drives the view angle lens according to a view angle control signal, a focus lens driving unit that drives the focus lens according to the focus control signal, It relays the control means that operates with a voltage and generates the angle-of-view control signal and the focus control signal according to the supply of the first and second power supplies, and the first or second power supply supplied from the operating device. And a power relay means for relaying only one of the predetermined power sources when receiving the first and second power sources at the same time, and the power source obtained from the power source relay means for supplying to the control means. Generate a predetermined voltage A voltage generating means, when the power from the power supply relay means is turned off is characterized in that and a capacitor that maintains a certain time the predetermined voltage.

Further, as a second invention, a lens position detecting means for detecting the position of the focus lens and transmitting position data, and a rewritable nonvolatile memory for storing the position data are provided. Characterize.

[0017]

With the above construction, according to the first aspect of the invention, sufficient control operation can be performed even when the power is turned off, and even if the angle of view and the focus are operated at the same time, the power is supplied from the operating device. The power supply does not short circuit.

According to the second aspect of the invention, it is possible to prevent the data for determining the proper position of the second group lens according to the position of the fourth group lens from being erased after each operation. it can.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, only the part of the structure different from the conventional example will be described. FIG. 1 is a block diagram showing the configuration of a surveillance camera device according to the present invention. In FIG. 1, the controller side and the lens side are connected by three lines of FOCUS, COMMON, and ZOOM. Rectifier 11 is FOCUS and ZO
Convert the OM plus / minus power supply to only plus, and switch with the relay 12 so as not to short-circuit.
The constant voltage circuit 13 creates a power source for the microcomputer 1 and the like. Further, the capacitor 14 is provided so that the second group motor 5 and the fourth group motor 6 can be rotated up to the commanded position even when the power is turned off. In addition, the E ₂ PRO memory, which is a non-volatile memory, stores the position data so that the memory of the subject distance is not lost even when the power is turned off.
M5 was provided.

Next, the operation will be described using a case. FOC
When -12V is input to the US line, it is converted to + 10.6V by the rectifier 11 and + 5V by the constant voltage circuit 13.
Is converted to. Also, -12V, ZO to FOCUS line
When + 10V is simultaneously input to the OM line, the rectifier 11
Are converted to + 10.6V and + 8.6V respectively, the relay 12 is activated, and + 8.6V is input to the constant voltage circuit 13 and converted to + 5V. Relay 12 is ZOOM
When a voltage is applied to the in, the drive coil of the relay 12
A current flows, the relay 12 operates, and the contact is switched to the Z side.
The operation of supplying the voltage on the ZOOM side to the constant voltage circuit 13
Make a work. Therefore, FOCUS line and ZOOM line
Even if a voltage is applied to both of the
It is supplied to the constant voltage circuit 13. In addition, only the FOCUS line
When voltage is applied to the contacts, the contacts are held on the FOCUS side.
Then, the voltage on the FOCUS side is supplied to the constant voltage circuit 13.
Here, as shown in FIG. 6, no relay 12, FOC
Apply + 18V to US line and -8V to ZOOM line
In that case, + 17V and -1V are added to the + side of the constant voltage circuit 13.
Is applied, causing a short circuit on the controller side. You
That is, when the angle of view and the focus are operated at the same time.
In this case, depending on the polarity of the power supplied from the operating device,
A power short circuit may occur. The microcomputer 1 operates with a power source of + 5V, but this power source is input only while the switch on the controller side is being pressed, so that the second group motor 5 and the fourth group motor 6 can be rotated up to the commanded positions. Capacitor 1 to secure time and power
4 is required. Since the second group motor 5 is a DC motor, DC
Driven by the motor driver 3, the potentiometer 7
The position is detected by, and it rotates to the command position. Since the fourth group motor 6 is a stepping motor, it is driven by the stepping motor driver 4, and when the zero point detection 8 is detected, the up / down counter at the fourth group position is reset. As described above, since the power is not always applied to the microcomputer 1, it is necessary to provide the E ₂ PROM 5 and store the position of the fourth lens group and the subject distance. Since the position of the fourth lens group is detected by using the up / down counter, the data is naturally lost when the power is turned off. Therefore, the E ₂ PROM 5 is necessary. Subject distance will be described with reference to two groups, four groups correlation diagram of FIG. If E ₂ PROM 5 does not exist, the conventional RA
Although the subject distance is stored in M2, it will be easy to understand if a method of not storing the subject distance is described. Now, the second group position is Te
At the end of le, the subject distance is 2 m and the subject is in focus. When the second lens group position is changed to Wide, first, Tel
The position of the fourth lens group at the end of e is detected, and the second / fourth group correlation diagram
It is calculated that the subject distance is 2 m based on (stored in M). Next, calculate the 4m group position of 2m at the Wide end,
Rotate the group motor and stop at its calculated value. In other words, there is no problem when zooming from Tele to Wide. However, when zooming from Wide to Tele, the position of the fourth group at the end of the Wide is detected, and the second group-4
When the subject distance is calculated based on the group correlation diagram, the positions of the four groups are almost the same at 1 m, 2 m, and ∞, so the calculated values vary depending on whether the subject distance is 1 m or ∞. When the position is at the Tele end, the focus is out of focus when the subject distance is 1 m or ∞. In this way, if the subject distance is not stored, the focus will be out of focus during zooming. However, if the subject distance is stored in the RAM 2 as in the conventional case, in the case of the CCTV system, the memory is lost each time the power is turned off, which is a problem.

Therefore, the subject distance can be stored in the rewritable E ₂ PROM without being lost even when the power is turned off.

Although the surveillance camera has been described in the above embodiment, the surveillance system using the surveillance camera device according to the present invention can obtain a synergistic effect by reducing the size and weight of the camera device. You can

[0023]

As described above, in the surveillance camera device according to the present invention, the lens side is provided with a voltage relay means including a rectifier and a relay, a constant voltage circuit as a voltage generation means, and a capacitor for maintaining a predetermined voltage for a predetermined time. By providing the above, it is possible to create a power supply for a microcomputer without a power supply line and avoid the risk of short-circuiting the power supply.

Further, by providing the E ₂ PROM which is a non-volatile memory, the data stored in the memory is not erased even when the power is turned off while the switch of the controller which is the operating device is not pressed. Yes, you can keep the focus out of focus even when zooming.

Therefore, the inner focus lens can be adopted for the surveillance camera, the zoom lens can be downsized, and the size and weight of the fixed focus lens can be made substantially the same. As a result, it has been necessary to use two or more peripheral devices such as a housing and a rotary base for a zoom lens and a fixed focus lens, but it is possible to make one type, and the CCTV system can be made compact and inexpensive. It has the effect that it can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a surveillance camera device of the present invention.

FIG. 2 is a conceptual diagram of power supply in a conventional surveillance camera device.

FIG. 3 is a diagram showing the structure of an inner focus lens for movies.

FIG. 4 is a second / fourth group correlation diagram showing a characteristic curve showing an appropriate fourth group position with respect to the second group lens position.

FIG. 5 is a conventional block diagram for controlling the inner focus lens shown in FIG.

[Figure 6] The relay 12 of the surveillance camera device shown in FIG. 1 is omitted.
Illustration when omitted

[Explanation of symbols]

1 microcomputer 2 RAM 3 DC motor driver 4 Stepping motor driver 5 2nd group motor 6 4th group motor driver 7 Potentiometer 8 Zero detector 9 Near / Far direction detector 10 Tele / Wide Direction Detector 11 Rectifier 12 relays

Claims (2)

(57) [Claims] 1. A surveillance camera device for adjusting perspective and focus of an angle of view by first and second power supplies supplied from an operating device, wherein the perspective of the angle of view is adjusted according to a sliding position. Angle of view lens, focus lens for adjusting focus according to sliding position, angle of view lens driving means for driving the angle of view lens according to the angle of view control signal, and focus for the focus according to the focus control signal Focus lens driving means for driving the lens, control means for operating at a predetermined voltage and generating the angle-of-view control signal and focus control signal in response to the supply of the first and second power supplies, and the operating device. And a power source relay means for relaying the first or second power source, and relaying only one of the predetermined power sources when the first and second power sources are received at the same time. Obtained electricity A voltage generating means for generating the predetermined voltage to be supplied to the control means, and a capacitor for maintaining the predetermined voltage for a certain period of time when the power supply from the power supply relay means is turned off. Surveillance camera device. 2. A lens position detecting means for detecting the position of the focus lens and transmitting position data, and a rewritable non-volatile memory for storing the position data. The surveillance camera device described.