JP2012198410A - Lens device for monitoring camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent insertion of a filter that is not intended by an operator, by preventing direct replacement between two or more ND filters used for a gradual reduction in quantity of light and a special filter that is lower in use frequency than the ND filters and is not continuous with the ND filters.SOLUTION: In a turret 62 for filter replacement, ND filters F1 and F2 for gradual reduction in quantity of light and a visible light cut filter F3 are disposed on the same circumference with a normally used dummy glass G therebetween. The rotation range of the turret 62 is limited so as to fall within 360 degrees and both ends of the rotation range are disposed between the ND filters F1 and F2 and the visible light cut filter F3. This prevents insertion of a filter that is not intended by an operator and prevents a discomfort video from being photographed.

Description

  The present invention relates to a lens device for a surveillance camera, and more particularly to a lens device for a surveillance camera having a turret switching filter device.

  In a surveillance camera lens device (for example, a CCTV (Closed Circuit Television lens)) and the like, the use of a plurality of filters by switching is increasing for higher performance.

  When shooting in a very bright environment such as in the daytime, the diameter of the aperture is reduced to reduce the amount of incident light, but as the aperture diameter decreases, blurring due to light diffraction occurs. There is a limit.

  Therefore, when the diaphragm reaches the limit of the small diaphragm, a filter for reducing the amount of light (a dimming (ND) filter) is inserted into the optical path.

  In Patent Document 1, an infrared filter, a CC (color correction) filter, and an ND filter are provided on a turret (rotary plate) in addition to transparent glass at a normal use position, and a desired filter is photographed by rotating the turret with a motor. An optical filter device is disclosed that is positioned on an axis. Patent Document 1 discloses that the rotational position of the turret is detected by a potentiometer having a rotation range within the range of 0 to 360 degrees (FIG. 10 of Patent Document 1).

  Further, in paragraph [0037] of Patent Document 2, an inclined ND region in which the concentration continuously changes is formed over a range of about 300 degrees in the circumferential direction of the filter turret, and this filter turret has a high concentration in the inclined ND region. The rotation is stopped by a mechanical stopper (not shown) so as not to rotate beyond the use range between the end portion on the side and the total transmission region provided adjacent to the end portion on the low concentration side of the inclined ND region. There is a description that the range is limited.

JP 2001-215600 A JP 2005-294988 A

  The optical filter device described in Patent Literature 1 can be inserted into the photographing optical axis by switching the infrared filter, CC filter, or ND filter instead of the transparent glass at the normal use position by rotating the turret. However, in order to switch from the normal use position to the ND filter, it is necessary to switch via the infrared filter and the CC filter. When using the ND filter that is relatively frequently used, there is a filter unrelated to the ND filter. Since it is temporarily inserted, there is a problem in that the image is uncomfortable. In addition, when the ND filter is provided adjacent to the transparent glass at the normal use position, it is possible to immediately switch from the normal use position to the ND filter. In this case, when switching to another filter other than the ND filter, Therefore, it is necessary to switch through the ND filter, and a filter unintended by the photographer is temporarily inserted.

  On the other hand, the filter turret described in Patent Document 2 has an inclined ND region in which the concentration continuously changes over a range of about 300 degrees in the circumferential direction, and does not switch a plurality of filters. It does not switch between different types of filters.

  The present invention has been made in view of such circumstances, and two or more ND filters that gradually reduce the amount of light, and a special feature that is less frequently used than an ND filter and has no continuity with the ND filter. When switching the filter by rotating the turret with the filter, the ND filter is not directly switched to the special filter, or the special filter is not directly switched to the ND filter. It is an object of the present invention to provide a lens device for a surveillance camera that can prevent a camera from being photographed.

  In order to achieve the above object, according to an aspect of the present invention, there is provided a surveillance camera lens device having a turret switching filter device, wherein the turret switching filter device includes a plurality of filters on the same circumference. A disc-shaped turret provided at a normal use position where a filter is not inserted on the optical axis of the lens, and provided within a range of a first central angle with respect to the normal use position. Two or more first filters that gradually reduce the amount of light, and provided within a range of a second central angle that does not overlap with the first central angle with respect to the normal use position, A turret having a second filter that is less frequently used than the first filter and has no continuity with the first filter, a rotation drive mechanism that rotates the turret, and the rotation Rotation restriction that limits the rotation range of the turret by a moving mechanism to 360 degrees or less and limits the rotation range of the turret so that both ends of the rotation range are between the first filter and the second filter Means.

  According to the monitoring camera lens device of one aspect of the present invention, the second non-continuous with the first filter directly from the two or more first filters that gradually reduce the amount of light. The rotation of the turret is limited so that it does not switch to the filter, and similarly, the rotation of the turret is limited so as not to switch directly to the first filter from the second filter, so a filter that is not intended by the operator is inserted. It is possible to prevent this, and it is possible to prevent an uncomfortable image from being shot.

  According to another aspect of the present invention, there is provided a surveillance camera lens device comprising: rotational position command means for commanding the rotational position of the turret based on an instruction input from a supervisor; and the rotational position of the turret from 0 degrees to 360 degrees. Based on the detection means for detecting within the range, the rotational position command from the rotational position command means and the detection output of the detection means, the turret is rotated within the range of 0 to 360 degrees via the rotational drive mechanism. And a control means.

  In the surveillance camera lens device according to still another aspect of the present invention, the rotation position command means includes a direction indicating unit that indicates a rotation direction of the turret, and the turret is operated each time the direction indicating unit is operated. And a rotational position command generator for generating a rotational position command for commanding rotation from the current rotational position to the next adjacent rotational position.

  In the surveillance camera lens device according to still another aspect of the present invention, the rotation position command generation unit does not receive an instruction from the direction instruction unit that exceeds a rotation range of 0 to 360 degrees of the turret. It is said. As a result, even if an operator inputs an incorrect rotation direction, a rotation position command exceeding the rotation limit range of the turret is not generated.

  In the surveillance camera lens device according to still another aspect of the present invention, the rotational position command means includes a dial switch that commands each rotational position of the turret, and the dial switch has a limited rotational range. It is characterized by that. According to this dial switch, it is possible to prevent the rotation position instruction exceeding the rotation range of the turret from being generated by the operator.

  In the surveillance camera lens device according to still another aspect of the present invention, the rotational position command means includes a slide switch for commanding each rotational position of the turret. According to this slide switch, it is possible to prevent an operator from issuing a rotational position instruction that exceeds the rotational range of the turret.

  In the surveillance camera lens device according to still another aspect of the present invention, the detection means is a potentiometer in which a rotation range for detecting the rotation of the turret is limited to within 360 degrees, and a limit end of the rotation range is the It is characterized by being located between the first filter and the second filter of the turret. Generally, a potentiometer is cheaper if its rotation range is limited (a range of 0 to 360 degrees), and the limit end of the rotation range of the potentiometer is connected to the first filter and the second filter of the turret. An inexpensive potentiometer can be applied between the filter and the potentiometer so that the potentiometer does not limit the rotation range of the turret (within 0 to 360 degrees).

  In the surveillance camera lens device according to still another aspect of the present invention, the potentiometer has a shaft directly connected to a rotation shaft of the turret. This eliminates the need for a complicated reduction gear, etc., compared to the case where the rotation position of the turret is detected by a potentiometer from the gear formed on the outer peripheral surface of the turret, and the rotation of the turret is simple and low cost. The position can be detected.

  In the surveillance camera lens device according to still another aspect of the present invention, the second filter is a visible light cut filter or a dimming ratio of the two or more first filters that are gradually dimmed. Is characterized by being a neutral density filter having a large attenuation ratio.

  In the surveillance camera lens device according to still another aspect of the present invention, the normal use portion provided at the normal use position of the turret is at the same position as when the first or second filter is inserted. A dummy glass for forming an image is provided. This prevents the optical path length from changing between a normal state where no filter is used and when the filter is used.

  According to the present invention, two or more first filters that gradually reduce the amount of light and a second frequency that is less frequently used than the first filter and has no continuity with the first filter. When switching a filter by rotating a turret having a filter, the rotation of the turret is limited so as not to switch to the second filter directly from the first filter, and similarly directly from the second filter, Since the rotation of the turret is limited so as not to switch to the first filter, it is possible to prevent a filter that is not intended by the operator from being inserted, and thus it is possible to prevent an uncomfortable image from being shot. .

The block diagram which shows the whole structure of the CCTV camera with which the lens apparatus for surveillance cameras concerning this invention was mounted | worn Side view including partial cross section of turret switching type filter device Turret top view The block diagram which shows embodiment of the switching control part of the filter in a turret switching type filter apparatus The figure which shows other embodiment of the operation part which instruct | indicates the rotation position of a turret

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

[Entire configuration of surveillance camera lens device]
FIG. 1 is a block diagram showing the overall configuration of a CCTV camera equipped with a surveillance camera lens device according to the present invention.

  As shown in the figure, the optical system of the surveillance camera lens device 10 (hereinafter simply referred to as “lens device”) includes a focus lens group 12, a zoom lens group 14, a diaphragm (iris) 16, an extender 18, and a master lens. The subject image is formed on the imaging surface of the CCD 22 (imaging device) of the camera 21 via the lens device 10.

  Further, a filter F (F1, F2, F3) provided in the turret 62 of the turret switching filter device 60 according to the present invention can be inserted into the optical path in the master lens group 20 as will be described later. Yes.

  The lens device 10 includes a focus lens group 12, a zoom lens group 14, a diaphragm 16, an extender 18, and motors 24, 26, 28, 30, and 32 for driving the turret 62, a focus lens group 12, and a zoom lens, respectively. The operations of the detectors 44, 46, 48, 50, 52 for detecting the positions of the group 14, the diaphragm 16, the extender 18 and the turret 62 and the lens groups 12, 14, 20, the diaphragm 16, the extender 18, the turret 62, etc. A control unit 70 is provided.

  The control unit 70 is provided with a central processing unit (CPU) 72 that performs overall control of each unit, a memory 74 such as a ROM and a RAM, a D / A converter, an A / D converter, and a drive circuit (not shown). . The control signals for the motors 24, 26, 28, 30, 32 output from the CPU 72 are applied to the motors 24, 26, 28, 30, 32 via a D / A converter and a drive circuit (not shown). .

  The focus lens group 12 moves back and forth along the optical axis when the rotational driving force of the motor 24 is transmitted via a gear transmission mechanism (not shown). The position (focus position) of the focus lens group 12 is detected by a detector 44 such as a potentiometer, and the detection signal of the detector 44 is notified to the control unit 70.

  Although not shown in detail, the zoom lens group 14 includes, as is well known, a variable magnification system lens and a correction system lens. The variable magnification system lens and the correction system lens each rotate the zoom cam barrel to rotate the optical axis. It is configured to be able to move with a certain relationship on the top. The zoom lens group 14 moves back and forth along the optical axis when the rotational driving force of the motor 26 is transmitted through a gear transmission mechanism (not shown).

  The position (zoom position) of the zoom lens group 14 is detected by a detector 46 such as a potentiometer, and the detection signal of the detector 46 is notified to the control unit 70. The diaphragm 16 is configured such that the diameter of the diaphragm expands and contracts when the rotational driving force of the motor 28 is transmitted through a gear transmission mechanism (not shown). The aperture value (iris position) is detected by a detector 48 such as a potentiometer, and the detection signal of the detector 48 is notified to the control unit 70.

  The extender 18 has a double extender lens disposed at the tip of the arm portion, and the extender lens is inserted on the optical axis by rotating the arm. The arm portion of the extender 18 is rotated by the rotational driving force of the motor 30. The rotation position (extender position) of the arm part of the extender 18 is detected by the detector 50, and the detection signal of the detector 50 is notified to the control unit 70. Based on this detection signal, the CPU 72 in the control unit 70 can grasp whether or not the extender lens is inserted on the optical axis.

  The configuration and control of the turret switching filter device 60 will be described later.

  The CPU 72 in the control unit 70 grasps the focus position, the zoom position, the iris position, the extender position, and the rotational position of the turret 62 based on detection signals input from the detectors 44, 46, 48, 50, and 52. By controlling the motors 24, 26, 28, 30, and 32, the focus lens group 12, the zoom lens group 14, the diaphragm 16, the extender 18, and the turret 62 are moved to desired target positions.

  Although not shown in FIG. 1, the master lens group 20 is movably disposed along the optical axis. By moving the master lens group 20 back and forth by a motor (not shown), Fine adjustment (flange back adjustment) of the lens imaging position is performed.

  The CCD 22 in the camera 21 to which the lens device 10 shown in FIG. 1 is attached photoelectrically converts the subject image formed on the imaging surface and outputs it as an image signal to the signal processing unit 23. The signal processing unit 23 generates a video signal in a predetermined format from the input image signal, and outputs the video signal to a monitor device 82 or the like placed in the monitoring room 80.

  In addition, the monitoring room 80 is provided with an operation unit 84, and the monitor adjusts the focus, zoom, diaphragm, etc. by operating the operation unit 84 while viewing the captured image displayed on the monitor device 82. The extension 18 and the filter F can be switched remotely. Note that the iris can be an auto iris that inputs a video signal from the camera 21 and automatically controls the brightness of the video signal.

[Turret switching filter device]
FIG. 2 is a side view including a partial cross section of the turret switching filter device 60.

  The turret switching filter device 60 mainly includes a turret 62, a motor 32, a potentiometer 52, and a control unit that drives and controls the motor 32.

  As shown in FIG. 3, the disc-shaped turret 62 includes a transparent dummy glass G, ND filters F1 and F2, and a visible light cut filter (infrared transmission filter) F3 on the same circumference of the turret 62. They are arranged at equal intervals of 90 degrees. The dummy glass G plays a role of preventing the optical path length from changing between the case of switching to the filters F1 to F3 and the normal state in which the filter is not used.

  As shown in FIG. 2, the rotating shaft 62A of the turret 62 is rotatably supported by a bearing 64, and the shaft 52A of the potentiometer 52 is directly connected. Further, a gear 62 </ b> B is provided on the outer peripheral surface of the turret 62 so as to be screwed with the gear 33 fixed to the output shaft of the motor 32.

  Accordingly, when the motor 32 is driven to rotate, the turret 62 can be rotated, and the rotational position of the turret 62 can be detected by the potentiometer 52.

  The potentiometer 52 is an inexpensive one whose axis 52A is within a range of 0 to 360 degrees and whose rotation range is limited, and a voltage signal (for example, 0 V to 10 V) corresponding to the rotation position of the axis 52A. Is output.

  In FIG. 3, among the dummy glass G and the filters F1 to F3 provided on the turret 62, the dummy glass G or the filters F1 to F3 at the 12 o'clock position of the watch are inserted into the use position (on the lens optical axis). Position). Assuming that the dummy glass G is at the 12 o'clock position as shown in FIG. 3, the potentiometer 52 outputs a voltage signal corresponding to 135 degrees as the rotational position of the turret 62.

  That is, the potentiometer 52 is arranged such that when the intermediate position between the ND filter F2 and the visible light cut filter F3 comes to the 12 o'clock position, one limit end (0 degree) of the rotation range of the potentiometer 52 comes. The shaft 52A is fixed to the rotation shaft 62A of the turret 62, and as shown in [Table 1], when the potentiometer 52 outputs a voltage signal corresponding to 45 degrees, 135 degrees, 225 degrees, and 315 degrees. The visible cut filter F3, the dummy glass G, the ND filter F1, and the ND filter F2 are moved to the use positions.

  The ND filters F1 and F2 gradually reduce the light amount to 1/8 and 1/64, respectively. The subject brightness in the monitoring area is bright, and the exposure is over even when the aperture 16 is set to the minimum aperture. Can be switched.

  On the other hand, the visible light cut filter F3 has a function of improving visibility, for example, when fog is generated in the monitoring area and the visibility is poor.

  Here, the ND filters F1 and F2 are switched in response to changes in the shooting environment such as weather and time zone, so that the frequency of use is high, but the visible light used when fog occurs. The cut filter F3 is less frequently used than the ND filters F1 and F2, and when the cut filter F3 is switched to the ND filter F2, it is considered that the cut filter F3 is not directly switched to the visible light cut filter F3.

  Therefore, in the present invention, switching from the normal state in which the turret 62 is switched to the dummy glass G to the ND filters F1 and F2 that gradually reduce the amount of light (the turret 62 rotates in the range of 135 degrees to 315 degrees). Switching from the normal state switched to the dummy glass G to the visible light cut filter (switching 2 in which the turret 62 rotates in the range of 135 degrees to 45 degrees) and the normal state ( Filter switching by the turret 62 so as not to switch directly from the ND filter F2 to the visible light cut filter F3 without passing through the position of the dummy glass G) and from directly switching from the visible light cut filter F3 to the ND filter F2. Try to limit.

[Filter switching control using the turret switching filter device]
FIG. 4 is a block diagram showing an embodiment of a filter switching control unit mainly in the turret switching filter device.

  The operation unit 84 of the monitoring room 80 includes direction instruction buttons 86A and 86B for instructing the rotation direction of the turret 62, and a rotation position command generation unit 88. Here, the direction instruction button 86A outputs an instruction signal for rotating the turret 62 in the clockwise direction (CW direction) in FIG. 3, and the direction instruction button 86B causes the turret 62 to rotate in the counterclockwise direction (CCW). Direction signal is output.

  The rotation position command generation unit 88 generates a rotation position command for instructing rotation of the turret 62 from the current rotation position to the next adjacent rotation position every time the direction instruction button 86A or 86B is pressed.

  For example, as shown in [Table 1], when the rotation direction of the current turret 62 is in the normal state (135 degrees) and the direction instruction button 86A is pressed, the next rotation position in the CW direction is 225 degrees. A rotation position command for commanding rotation to the rotation position is generated.

  The rotational position command (digital signal) generated from the rotational position command generation unit 88 is input to the control unit 70 of the lens apparatus 10 via a communication cable.

  The D / A converter 90 of the control unit 70 converts the digital rotation position command into an analog signal (voltage signal) output from the potentiometer 52 and corresponding to the rotation position of 225 degrees. Output to one input.

  A voltage signal indicating the rotational position of the turret 62 is added from the potentiometer 52 to the other input of the adder 92, and the adder 92 uses the deviation of the two input signals as a signal indicating the operation amount of the motor 32. The output is output to the motor 32 via 94 and the motor 32 is rotated. When the turret 62 rotates with the rotation of the motor 32 and the detection output of the potentiometer 52 detects that the turret 62 has been rotated to a position of 225 degrees, the deviation obtained by the adder 92 becomes zero, The rotation of the motor 32 is stopped.

  Similarly, when the current rotation position of the turret 62 is the position (225 degrees) at which the turret 62 is switched to the ND filter F1, if the direction instruction button 86A is further pressed, the next rotation position in the CW direction is 315 degrees. A rotation position command for instructing rotation to the rotation position is generated, and the turret 62 rotates to a position (315 degrees) where the ND filter F2 is switched.

  Thereafter, when the current rotation position of the turret 62 is a position (315 degrees) where the turret 62 is switched to the ND filter F2, when the direction instruction button 86A is further pressed, the rotation position command generation unit 88 causes the turret 62 to be CW. Therefore, the rotation position command for rotating the turret 62 in the CW direction is not output, thereby limiting the rotation range of the turret 62. That is, even if the direction instruction button 86A is repeatedly pressed, the ND filter F2 is not directly switched to the visible light cut filter F3.

  Since there is a limit end of the rotation range of the potentiometer 52 between the ND filter F2 and the visible light cut filter F3, the turret 62 is directly limited from the ND filter F2 to the visible light cut filter F3. Will not switch to.

  On the other hand, when the direction instruction button 86B is pressed, a command to rotate the turret 62 in the CCW direction is generated every time the direction instruction button 86B is pressed, whereby the turret 62 is in the ND filter F2 → F1 → normal state (dummy In order of glass G), these filters and the like are rotated.

  Further, when the turret 62 is switched to the normal state (dummy glass G) (135 degrees) and the direction instruction button 86B is further pressed, the rotation position to the 45-degree rotation position that is the next rotation position in the CCW direction is reached. A rotation position command for commanding rotation is generated, and the turret 62 rotates to a position (45 degrees) at which the visible light cut filter F3 is switched.

  Similarly to the above, when the current rotation position of the turret 62 is the position where the visible light cut filter F3 is switched (45 degrees), when the direction instruction button 86B is further pressed, the rotation position command generation unit 88 is Since the turret 62 is located at the end in the CCW direction, the rotation position command for rotating the turret 62 in the CCW direction is not output, thereby limiting the rotation range of the turret 62. That is, even if the direction instruction button 86B is repeatedly pressed, the visible light cut filter F3 is not directly switched to the ND filter F3.

  As described above, the switching 1 from the normal state to the ND filters F1 and F2 for reducing the light quantity step by step and the switching 2 from the normal state to the visible light cut filter are divided and do not pass through the position in the normal state. The filter switching by the turret 62 is restricted so as not to switch directly to the visible light cut filter F3 from the ND filter F2 and to directly switch from the visible light cut filter F3 to the ND filter F2. Even if the direction instruction button 86A or 86B is inadvertently operated, an image unintended by the supervisor can be prevented from being shot.

  Further, a mode for rotating the turret 62 in the range of switching 1 and a mode of rotating in the range of switching 2 may be provided, and selection means for selecting these modes may be provided. According to this, unless the mode is switched, the normal state is not exceeded and the range of the switching 1 is not rotated to the range of the switching 2, and similarly the normal state is exceeded and the range of the switching 2 is rotated to the range of the switching 1 Therefore, even if the supervisor carelessly operates the direction instruction button 86A or 86B, it is possible to prevent an image unintended by the supervisor from being captured.

  Further, the mode for controlling the diaphragm can be selected by the selection means. When the mode for controlling the diaphragm is selected, the direction indicating buttons 86A and 86B are operated to continuously change the aperture diameter of the diaphragm 16. You may make it also serve as a means. In this case, when the direction instruction button 86A is pressed so as to coincide with the operation direction at the time of switching the ND filter, the aperture diameter of the diaphragm 16 is instructed so that the aperture diameter of the diaphragm gradually decreases, and the direction instruction button It is preferable to assign the functions of the direction indicating buttons 86A and 86B so as to instruct the aperture diameter of the diaphragm 16 so that the aperture diameter of the diaphragm gradually increases when 86B is pressed.

[Other Embodiments of Operation Unit]
FIGS. 5A and 5B are diagrams showing another embodiment of the operation unit for instructing the rotational position of the turret 62, respectively. The direction indicating buttons 86A and 86B and the rotational position command generation shown in FIG. This is an operation unit corresponding to the unit 88.

  The operation unit shown in FIG. 5A includes a dial switch 100 that commands each rotational position of the turret 62. The dial switch 100 is in a normal state, ND filters F1, F2, and visible light according to the rotational position. A rotation position command of the turret 62 for switching the cut filter F3 is output.

  Further, as the dial switch 100, it is preferable to use a dial switch whose rotation range is limited and the dial switch 100 cannot mechanically rotate between the ND filter F2 and the visible light cut filter F3. According to this, it is possible to prevent the rotation position instruction exceeding the rotation range of the turret 62 from being generated from the supervisor.

  The operation unit shown in FIG. 5B includes a slide switch 102 that commands each rotational position of the turret 62. This slide switch 102 is in a normal state, the ND filter F1, and the like according to the slide position of the slide knob 102A. A rotation position command of the turret 62 for switching the F2 and visible light cut filter F3 is output. According to the slide switch 102, it is possible to prevent a rotation position instruction from exceeding the rotation range of the turret 62 from being generated by the supervisor.

  In this embodiment, the turret 62 is provided with two ND filters F1 and F2 that gradually reduce the amount of light. However, three ND filters that gradually decrease the amount of light at a constant rate are provided. You may make it provide more sheets.

  In addition, the case where the visible light cut filter is provided in the turret as a filter that is less frequently used than the plurality of ND filters and has no continuity with the plurality of ND filters has been described. An ND filter (for example, an exposure adjustment magnification of 1 / 10,000) may be provided.

  Further, in the normal state, a transparent dummy glass is inserted, but an opening may be provided without providing the dummy glass. In this case, it is necessary to shift the focus position by a certain amount between the normal state and when the filter is inserted.

  The detection means for detecting the rotational position of the turret is not limited to a potentiometer, and for example, a means for reading a mark or the like provided at a predetermined position of the turret with a photo interrupter, an encoder or the like can be applied.

  Further, the position where the turret switching filter device (turret) is provided is not limited to the inside of the master lens group 20, but may be provided, for example, outside the master lens group 20 and on the side close to the camera.

  Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Lens apparatus (lens apparatus) for surveillance cameras, 12 ... Focus lens group, 14 ... Zoom lens group, 16 ... Iris, 18 ... Extender, 20 ... Master lens group, 22 ... CCD, 23 ... Signal processing part , 24, 26, 28, 30, 32 ... motor, 44, 46, 48, 50, 52 ... detector, 60 ... turret switching filter device, 62 ... turret, 70 ... control unit, 72 ... central processing unit (CPU) , 82 ... Monitor device, 84 ... Operation unit, 86A, 86B ... Direction indication button, 88 ... Rotation position command generation unit, 100 ... Dial switch, 102 ... Slide switch

Claims (10)

In a surveillance camera lens device having a turret switching filter device,
The turret switching filter device is
A disc-shaped turret provided with a plurality of filters on the same circumference, with a normal use portion provided at a normal use position where no filter is inserted on the lens optical axis, and the normal use position as a reference Two or more first filters that are provided within a range of the first central angle and gradually reduce the amount of light, and a second that does not overlap with the first central angle with respect to the normal use position A turret having a second filter provided within a central angle range, less frequently used than the first filter, and having no continuity with the first filter;
A rotation drive mechanism for rotating the turret;
The rotation range of the turret by the rotation drive mechanism is limited to within 360 degrees, and the rotation range of the turret is limited so that both ends of the rotation range are between the first filter and the second filter. Rotation limiting means;
A lens device for a surveillance camera, comprising: Rotational position command means for commanding the rotational position of the turret based on an instruction input from a supervisor;
Detection means for detecting the rotational position of the turret within a range of 0 degrees to 360 degrees;
Control means for rotating the turret within a range of 0 to 360 degrees via the rotation drive mechanism based on the rotation position command from the rotation position command means and the detection output of the detection means;
The surveillance camera lens device according to claim 1, further comprising:   The rotational position command means commands a direction indicating unit for instructing the rotation direction of the turret, and commands the rotation of the turret from the current rotational position to the next adjacent rotational position each time the direction indicating unit is operated. The surveillance camera lens device according to claim 2, further comprising: a rotational position command generation unit configured to generate a rotational position command to be performed.   The surveillance camera lens device according to claim 3, wherein the rotation position command generation unit does not receive an instruction from the direction instruction unit that exceeds a rotation range of 0 to 360 degrees of the turret.   The surveillance camera lens device according to claim 2, wherein the rotational position command means includes a dial switch that commands each rotational position of the turret, and the rotational range of the dial switch is limited. .   The surveillance camera lens device according to claim 2, wherein the rotational position command unit includes a slide switch that commands each rotational position of the turret.   The detection means is a potentiometer in which a rotation range for detecting rotation of the turret is limited to within 360 degrees, and a limit end of the rotation range is between the first filter and the second filter of the turret. The surveillance camera lens device according to claim 2, wherein the surveillance camera lens device is located.   The surveillance camera lens device according to claim 7, wherein an axis of the potentiometer is directly connected to a rotation shaft of the turret.   The second filter is a visible light cut filter, or a neutral density filter having a greater attenuation ratio than the attenuation ratio of the two or more first filters that are gradually attenuated. The surveillance camera lens device according to any one of claims 1 to 8.   The normal use portion provided at the normal use position of the turret is provided with a dummy glass for forming an image at the same position as when the first or second filter is inserted. The surveillance camera lens device according to any one of claims 1 to 9.

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