JP2000078454A - Preset zoom lens device for monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a preset operation concerning the zoom lens for a monitor of an inner focus system. SOLUTION: The position information of object distance and angle of view is stored in data latches 16 and 18 and outputted with a resistance ratio while using D/A converters 17 and 19, and a reference voltage from the side of control is applied as the reference voltage of data latches 16 and 18 and D/A converters 17 and 19. Thus, the low-cost preset zoom lens for the monitor of an inner focus system can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preset type zoom lens apparatus for monitoring in a CCTV system in which a control site and a camera site are separated and a preset operation is possible.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the configuration of a conventional monitoring preset type zoom lens device. This preset zoom lens device for monitoring is a front lens type zoom lens device, and includes a focus motor 51 for adjusting the focus of the lens, a zoom motor 52 for changing the angle of view by performing the zoom adjustment, and a focus motor. It comprises a focus potentiometer 53 for controlling the operation of 51 and a zoom potentiometer 54 for controlling the operation of the zoom motor 52.

[0003] In addition to the above-mentioned front lens type, there is an inner focus type as a monitoring preset type zoom lens device, and a conventional inner focus type monitoring zoom lens device is disclosed in, for example, JP-A-7-23269.
Are disclosed in US Pat.

[0004]

However, the conventional preset type zoom lens apparatus for monitoring of the conventional front lens focusing method has a problem that the cost is high.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a monitoring preset type zoom lens apparatus which is inexpensive and employs an inner focus system.

[0006]

According to the present invention, in order to solve the above-mentioned problem, a data latch, a D / A converter and a constant voltage circuit are provided in an inner focus type monitoring zoom lens device.

As described above, a monitoring preset type zoom lens apparatus which is inexpensive in the inner focus system can be obtained.

[0008]

A first aspect of the present invention is a zoom lens device for a surveillance camera that adjusts the perspective and the focus of the angle of view using first and second power supplies supplied from an operation device. An angle-of-view lens driving member that drives an angle-of-view lens according to an angle-of-view control signal; a focus lens driving member that drives a focus lens according to a focus control signal;
A control unit that operates at a predetermined voltage and generates the angle-of-view control signal and the focus control signal in response to the supply of the first and second power sources; and stores the fourth group position and subject distance data obtained by the control unit. Relaying a first or second power supply supplied from an operation means, and
Power supply relay means for relaying only one of predetermined power supplies when simultaneously receiving the second power supply, and a voltage for generating the predetermined voltage to be supplied to the control means by a power supply obtained from the power supply relay means Generating means, a capacitor for maintaining the predetermined voltage for a predetermined time when power from the power relay means is turned off, and a first data latch for storing subject distance data obtained from the control means;
A second data latch for storing position information of the angle of view obtained from the control means, and a first D / A converter for converting data of a subject distance stored in the first data latch into a resistance ratio. , A second D / A converter for converting the position information of the angle of view stored in the second data latch into a resistance ratio, and a constant voltage circuit for supplying a reference voltage as a power supply for the data latch The position information of the subject distance and the angle of view is stored in a data latch, output using a D / A converter at a resistance ratio, and a reference voltage from a control site is supplied to a power supply of the data latch and the D / A.
It has the effect of supplying as a reference voltage for the converter.

According to a second aspect of the present invention, in the monitoring preset type zoom lens apparatus according to the first aspect, the reference voltage of about 5 V is set to 3 to 3.3 V using a constant voltage circuit, and the power is supplied to the reference voltage. Is supplied as the power source of the data latch, and has an effect that a stable voltage can be supplied to the means for storing data.

According to a third aspect of the present invention, there is provided the monitoring type preset zoom lens apparatus according to the first or second aspect, wherein the preset type which outputs the position information of the subject distance and the angle of view and the electric type which does not output the information. The preset type uses a 7 or 8 pin connector, and the electric type uses a 3 or 4 pin connector. The preset type outputs the object distance and the position information of the angle of view, and the electric type does not output. It has the effect that can be shared.

According to a fourth aspect of the present invention, in the surveillance preset type zoom lens apparatus according to the first aspect, an EEPROM is used as data storage means, and even if the focus / zoom voltage is cut off. This has the effect of keeping the position information from disappearing.

According to a fifth aspect of the present invention, in the monitoring preset type zoom lens device according to the fourth aspect, a RAM supplied with power from the reference voltage is used instead of the EEPROM. EEPR
This has the effect of resolving the drawback that the OM write cycle has a life.

According to a sixth aspect of the present invention, in the monitoring preset zoom lens apparatus according to the first aspect, a stepping motor is used as a view angle lens driving member. Preset type zoom lens device for monitoring.

According to a seventh aspect of the present invention, in the monitoring preset type zoom lens device according to the second aspect, the constant voltage circuit always supplies a reference voltage as a power supply of the data latch. There is an effect that data is retained even when the output voltage from the control site is zero, the analog switch group always operates, and the resistance ratio is retained.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a monitoring preset type zoom lens apparatus (hereinafter simply referred to as "zoom lens apparatus" for convenience) according to Embodiment 1. In FIG. 1, reference numeral 1 denotes a microcomputer for controlling the entire operation of the zoom lens apparatus according to the embodiment, and 2 denotes a memory which is built in the microcomputer 1 and which can store data for control arithmetic processing as needed. RAM, 3 is a DC motor driver for driving a lens, 4 is a stepping motor, 5 is a 2 group motor, 6 is a 4 group motor, 7 is a potentiometer, 8 is a zero point detector, 9 is a perspective direction detector, and 10 is a perspective detector.
Tele / Wide direction detector, 11 is a rectifier, 12 is a relay,
13 is a constant voltage circuit, 14 is a capacitor, 15 is EEPR
OM. 16 and 18 are data latches,
17 and 19 are D / A converters, and 20 is a constant voltage circuit.

In the above configuration, the microcomputer 1 positions the second group motor 5 and the fourth group motor 6 (rotational angle positions, that is, the amount of movement for adjusting the focus) so that focus is not achieved even when zooming. , And is constituted by one chip. RAM
Reference numeral 2 denotes an operation for performing an operation for controlling the operation of each functional unit including the second group motor 5 and the fourth group motor 6,
It is built in the microcomputer 1. The DC motor driver 3 functions to drive the second group motor 5, and is configured by one chip. The stepping motor driver 4 functions to drive the fourth group motor 6, and is constituted by one chip. The second group motor 5 performs the function of driving the second group, and is constituted by a DC motor. The fourth group motor 6 performs an operation of driving the fourth group, and is configured by a stepping motor. The potentiometer 7 has a function of detecting the position of the second group motor 5, and is constituted by a resistor sensor.

The zero point detector 8 detects the position of the fourth group motor 6, and is constituted by a photo interrupter. The Near / Far direction detector 9 performs a function of detecting a direction, and is configured by a photocoupler. Tele ／
The wide direction detector 10 performs a function of detecting a direction, and is configured by a photocoupler. Rectifier 11 is + /
-It works to make either voltage a positive voltage,
It is composed of diodes. The relay 12 functions to set the power supply voltage at either the focus or zoom voltage, and is constituted by a small DC relay. Constant voltage circuit 1
Reference numeral 3 denotes a function for making the voltage constant even when the input voltage changes, and is constituted by a constant voltage IC. The capacitor 14 functions to operate the microcomputer for a while even if the focus / zoom voltage is cut off, and is composed of an electrolytic capacitor. The EEPROM 15 stores the position of the fourth group and the subject distance data, and also has a function of preventing the position information from being erased even when the focus / zoom voltage is cut off, and is constituted by a nonvolatile memory.

The data latches 16 and 18 store the data of the subject distance and the position information of the angle of view, and are constituted by register circuits. In this embodiment, the data latch 16 stores the data of the subject distance as a storage means, while the data latch 18 stores the position information of the angle of view as the storage means. The D / A converters 17 and 19 perform an operation of converting digital data into a resistance ratio.
It consists of a ladder-type resistor network and analog switches. In this embodiment, the D / A converter 17 converts the subject distance data stored in the data latch 16 into a resistance ratio, while the converter 19 converts the position information of the angle of view stored in the data latch 18 into a resistance ratio. Convert to ratio. The constant voltage circuit 20 serves to supply a reference voltage as a power supply for a data latch.
It is composed of

The operation of the monitoring zoom lens device configured as described above will be described with reference to FIG. First of all, +/-
-Rectifier 11 and relay 1
The constant voltage circuit 13 sets a constant voltage (3 V) even when the output voltage from the control site changes from the lowest voltage (4.5 V) to the highest voltage (12 V). Using the microcomputer 1 and the RAM 2, the DC motor driver 3 and the stepping motor driver 4 are controlled, and the position of the second group motor 5 and the fourth group motor 6 is stopped while the position is detected by the potentiometer 7 and the zero point detector 8. Let it. Even if the focus / zoom voltage is cut off by the capacitor 14, the microcomputer is operated for a while,
The position is stored in the ROM 15.

The data latch 16 stores the position information of the subject distance, and the D / A converter 17 converts the digital data into a resistance ratio. Data latch 18 stores the position information of the angle of view, and D / A converter 19 converts the digital data into a resistance ratio. The constant voltage circuit 20 sets a reference voltage of about 5 V to 3 to 3.3 V by using a constant voltage circuit, and supplies it as a power source for the data latches 16 and 18. The reference voltage is applied to the data latch 16 by the constant voltage circuit 20,
The voltage is always supplied as voltage 18 and the data is retained even when the output voltage from the control site is zero, the analog switch group always operates and the resistance ratio is retained.

The size and cost characteristics according to the embodiment of the present invention and the conventional size and cost characteristics are shown in comparison with (Table 1).

As is clear from Table 1, the surveillance preset zoom lens device according to the embodiment of the present invention can provide excellent effects in terms of size and cost.

As described above, according to the embodiment of the present invention, the position information of the subject distance and the angle of view is stored in the data latch, and is output at a resistance ratio using a D / A converter. By supplying the reference voltage as the power supply for the data latch and the reference voltage for the D / A converter, the same function as the monitoring preset zoom lens device in the inner focus method is achieved, the size is reduced, and the cost is reduced. Can be.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of a zoom lens apparatus according to Embodiment 2.
In FIG. 2, reference numeral 21 denotes a microcomputer for controlling the operation of the entire zoom lens apparatus according to the present embodiment, and reference numeral 22 denotes a memory which is incorporated in the microcomputer 21 and which can be written at any time to store data for control arithmetic processing. RAM, 23 is a DC motor driver for driving a lens, 24 is a stepping motor, 25 is a second group motor, 26 is a fourth group motor, 27 is a potentiometer, 28 is a zero point detector, 29 is a near / far direction detector, 30 is Tele / Wide direction detector, 31 is a rectifier, 3
2 is a relay, 33 is a constant voltage circuit, 34 is a capacitor, 3
Reference numeral 5 denotes a storage RAM. 36 and 38 are data latches; 37 and 39 are D / A converters;
Is a constant voltage circuit.

In the above-described configuration, the microcomputer 21 controls the positions of the second group motor 25 and the fourth group motor 26 so that the focus is not blurred even when zooming, and is constituted by one chip. RAM 22 is 2
The microcomputer 21 is incorporated in the microcomputer 21 because it performs an operation for controlling the operation of each functional unit including the group motor 25 and the fourth group motor 6. The stepping motor driver 23 performs an operation of driving the second group motor 25, and is configured by one chip. The stepping motor driver 24 drives the fourth group motor 26, and is formed of one chip. 2
The group motor 25 performs the function of driving the two groups, and is configured by a stepping motor. 4th group motor 26 is 4
It performs a function of driving a group, and is configured by a stepping motor. The zero point detecting section 28 performs an operation of detecting the positions of the two groups, and is constituted by a photo interrupter.

The zero point detector 28 performs the function of detecting the positions of the four groups, and is constituted by a photo interrupter. The Near / Far direction detector 29 performs a function of detecting a direction, and is configured by a photocoupler. Tele / Wi
The de direction detector 30 performs a function of detecting a direction.
It consists of a photocoupler. The rectifier 31 has a function of converting either the +/− voltage to a + voltage, and is constituted by a diode. The relay 32 functions to set the power supply voltage for both the focus and zoom voltages, and is constituted by a small DC relay. Constant voltage circuit 33
Performs a function of maintaining a constant voltage even when the input voltage changes, and is constituted by a constant voltage IC. The capacitor 34 functions to operate the microcomputer for a while even if the focus / zoom voltage is cut off, and is constituted by an electrolytic capacitor. The storage RAM 35 functions to prevent the position information from being erased even when the focus / zoom voltage is cut off, and is constituted by a rewritable RAM as needed.

The data latches 36 and 38 store the position information of the subject distance and the angle of view, and are constituted by register circuits. The D / A converters 37 and 39 convert digital data into a resistance ratio.
It is composed of a spiral resistor network and an analog switch group. The constant voltage circuit 40 converts the reference voltage into data
The power supply for the latch and the power supply for the storage RAM 35 are provided, and are constituted by a constant voltage IC.

The operation of the monitoring zoom lens device configured as described above will be described with reference to FIG. First of all, +/-
Rectifier 31 and relay 3
The constant voltage circuit 33 sets the voltage to a constant voltage (3 V) even when the output voltage from the control site changes from the lowest voltage (4.5 V) to the highest voltage (12 V). Using the microcomputer 21 and the RAM 22, the stepping motor driver 23 and the stepping motor driver 24 are controlled, and the second group motor 25 and the fourth group motor 26 are stopped at the calculated positions while the positions are detected by the zero point detection 27 and the zero point detection 28. Let it. Even if the focus / zoom voltage is cut off by the condenser 34, the microcomputer is operated for a while,
Meanwhile, the position is stored in the storage RAM 35.

The data latch 36 stores the position information of the subject distance, and the D / A converter 37 converts the digital data into a resistance ratio. The position information of the angle of view is stored in the data latch 38, and the digital data is converted into a resistance ratio by the D / A converter 39. The constant voltage circuit 40 sets a reference voltage of about 5 V to 3 to 3.3 V using a constant voltage circuit and supplies the data latches 36 and 38 with power. The reference voltage is always supplied by the constant voltage circuit 40 as the power supply of the data latch, and the data is retained even when the output voltage from the control site is zero, the analog switch group always operates, and the resistance ratio is retained.

As described above, according to the embodiment of the present invention, by using the stepping motor as the second group motor 25, the current consumption is slightly increased, but the stopping accuracy is improved. Can be. Also, EEP
By using a storage RAM 35 to which a current is supplied from the reference voltage instead of the ROM,
The disadvantage that the number of times of writing the OM has a life can be solved.

[0032]

As described above, according to the present invention, by providing a data latch and a D / A converter in place of a potentiometer, an inexpensive surveillance preset type zoom lens apparatus using an inner focus system can be provided. can get. Further, by using a storage RAM to which power is supplied from the above-mentioned reference voltage instead of the EEPROM, it is possible to obtain an effect of solving the drawback that the EEPROM has a limited number of times of writing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a monitoring preset type zoom lens device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a monitoring preset type zoom lens device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional monitoring preset type zoom lens device.

[Description of Signs] 1 Microcomputer 2 RAM 3 DC motor driver 4 Stepping motor driver 5 2nd group motor 6 4th group motor 7 Potentiometer 8 Zero point detection unit 9 Near / Far direction detector 10 Tele / Wide direction detector 11 Rectifier 12 Relay 13 Low Voltage Circuit for Electric Operation 14 Capacitor 15 EEPROM 16 Data Latch for Focus 17 D / A Converter for Focus 18 Data Latch for Zoom 19 D / A Converter for Zoom 20 Preset Operation Constant Voltage Circuit 21 Microcomputer 22 For Calculation RAM 23 Stepping motor driver 24 Stepping motor driver 25 2nd group motor 26 4th group motor 27 Potentiometer 28 Zero point detector 29 Near / Far direction detector 30 Te e / Wide direction detector 31 Rectifier 32 Relay 33 Constant voltage circuit 34 Capacitor 35 Storage RAM 36 Focus data latch 37 Focus D / A converter 38 Zoom data latch 39 Zoom D / A converter 40 Preset operation Constant voltage circuit 51 DC motor for focus 52 DC motor for zoom 53 Potentiometer for focus 54 Potentiometer for zoom

Claims (7)

[Claims] 1. A zoom lens device of a monitoring camera for adjusting a perspective and a focus of an angle of view by first and second power supplies supplied from an operation device, wherein the angle of view lens is adjusted according to an angle of view control signal. An angle-of-view lens driving member that drives a focusing lens, a focusing lens driving member that drives a focusing lens according to a focus control signal, and a view voltage control signal that operates at a predetermined voltage and is supplied with the first and second power supplies. And a control means for generating a focus control signal; a data storage means for storing the fourth group position and subject distance data obtained by the control means; and a first or second power supply supplied from the operation means. Power relay means for relaying only one of the predetermined power sources when the first and second power sources are simultaneously received; and a power source obtained from the power relay means for supplying the power to the control means. Voltage generating means for generating the predetermined voltage, a capacitor for maintaining the predetermined voltage for a fixed time when the power from the power relay means is turned off, and a subject distance data obtained from the control means. 1
A second data latch for storing the position information of the angle of view obtained from the control means, and a first data latch for converting the subject distance data stored in the first data latch into a resistance ratio. A D / A converter, a second D / A converter for converting the position information of the angle of view stored in the second data latch into a resistance ratio, and a constant voltage for supplying a reference voltage as a power supply for the data latch A data latch for storing the position information of the subject distance and the angle of view in a data latch, outputting the data as a resistance ratio using a D / A converter, and outputting a reference voltage from a control site to a power supply of the data latch and the D / A. An inner focus type monitoring preset zoom lens device which is supplied as a reference voltage of a converter. 2. A preset zoom lens apparatus for monitoring according to claim 1, wherein the reference voltage is set to about 3 V to about 3.3 V using a constant voltage circuit and supplied as a power supply for the data latch. . 3. A circuit is shared between a preset type that outputs the position information of the subject distance and the angle of view and a motorized type that does not output the position information,
3. The monitoring preset zoom lens device according to claim 1, wherein the preset type has a 7 or 8 pin connector, and the electric type has a 3 or 4 pin connector. 4. The monitoring preset zoom lens device according to claim 1, wherein an EEPROM is used as the data storage means. 5. The monitoring preset zoom lens device according to claim 4, wherein a RAM supplied with power from the reference voltage is used instead of the EEPROM. 6. The preset zoom lens apparatus for monitoring according to claim 5, wherein a stepping motor is used for the angle-of-view lens driving member. 7. The monitoring preset type zoom lens device according to claim 2, wherein the constant voltage circuit always supplies a reference voltage as a power source of the data latch.