JP2020188348A - Imaging device, image monitoring system, and control method of imaging device - Google Patents

Abstract

To provide an imaging device, an image monitoring system, and a control method thereof that can be miniaturized while being equipped with a tilt rotation mechanism of an imaging element and an optical filter insertion/removal mechanism.SOLUTION: An imaging device includes an imaging element, a tilt drive unit that rotationally drives at least one of an imaging optical system and an imaging element with respect to a plane orthogonal to the optical axis of the imaging optical system, an insertion/removal drive unit for driving an optical filter in/out of an optical path of light from the imaging optical system, and a control unit that determines the rotation direction of the imaging element and performs control so as to drive the tilt drive unit and the insertion/removal drive unit, and the control unit determines the insertion/removal direction of the optical filter on the basis of the rotation direction, and controls the insertion/removal drive unit on the basis of the insertion/removal direction.SELECTED DRAWING: Figure 10

Description

The present invention relates to an image pickup device including a tilt-rotatable image pickup device, an image monitoring system, and a control method for the image pickup device.

Conventionally, in network cameras represented by surveillance cameras, in order to deepen the depth of field when the aperture is open, a camera with a tilt rotation function that expands the depth of field range by tilting the lens and image sensor relatively has been used. in use.

In addition, many surveillance cameras are provided with an optical filter that is arranged in the vicinity of the image sensor and blocks light in the infrared region in order to acquire a good image in bright daytime. In nighttime or dark place monitoring where a large amount of light is desired to be captured, it is common to retract the optical filter from the optical path and capture light in the infrared region.

Patent Document 1 describes a tilt rotation mechanism for adjusting the tilt rotation of an image sensor, an optical filter insertion / removal mechanism that is movable in a direction orthogonal to the optical axis and has an infrared cut filter and a dummy glass plate. An imaging device comprising the above is disclosed.

Japanese Patent No. 5499581

However, both the tilt rotation mechanism and the optical filter insertion / removal mechanism of the image sensor require a certain movable region in the optical axis direction. In the image pickup device of Patent Document 1, it is necessary to provide independent regions for the tilt rotation mechanism of the image pickup element and the optical filter insertion / removal mechanism, and when the two mechanisms are mounted, the image pickup device becomes large.

An object of the present invention is to provide an image pickup device, an image monitoring system, and a control method thereof that can be miniaturized while incorporating a tilt rotation mechanism of an image pickup device and an optical filter insertion / removal mechanism.

The image pickup device as one aspect of the present invention includes an image pickup element, a tilt drive unit for rotationally driving at least one of the image pickup optical system and the image pickup element with respect to a plane orthogonal to the optical axis of the image pickup optical system, and optics. An insertion / extraction drive unit for driving the filter in the optical path of light from the image pickup optical system, and a control unit for determining the rotation direction of the image sensor and controlling the tilt drive unit and the insertion / removal drive unit. The control unit is characterized in that the insertion / removal direction of the optical filter is determined based on the rotation direction, and the insertion / removal drive unit is controlled based on the insertion / removal direction.

Further, the control method of the image pickup device as another aspect of the present invention is a control method of the image pickup device having the image pickup element and the optical filter inserted and removed with respect to the optical path of the light from the image pickup optical system. A step of rotationally driving at least one of the optical system and the image pickup element, a step of determining the rotation direction of the image pickup element, a step of determining the insertion / removal direction of the optical filter based on the rotation direction, and an optical filter based on the insertion / removal direction. It is characterized by having a step of inserting and removing.

According to the present invention, it is possible to provide an image pickup device, an image monitoring system, and a control method thereof that can be miniaturized while incorporating a tilt rotation mechanism of an image pickup device and an optical filter insertion / removal mechanism.

It is an exploded perspective view of the network surveillance camera which is an example of the image pickup apparatus in embodiment of this invention. It is sectional drawing of the lens barrel which attached the image sensor unit. It is an exploded perspective view of the lens barrel which attached the image sensor unit. It is a perspective view of the image sensor holding part. It is sectional drawing of the image sensor holding part. It is a block diagram of the block of a surveillance camera system. It is sectional drawing of the infrared cut filter insertion / removal drive part in a state without tilt rotation of an image sensor unit. It is sectional drawing of the infrared cut filter insertion / removal drive part in the state which tilt-rotated so that the upper part of an image sensor unit becomes a subject side. It is sectional drawing of the infrared cut filter insertion / removal drive part in the state which the lower part of an image sensor unit is tilted and rotated so that it becomes a subject side. It is a flowchart which shows the insertion / removal drive processing of an infrared cut filter.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. In each figure, the same member is given the same reference number, and duplicate description is omitted.

FIG. 1 is an exploded perspective view of a network surveillance camera (hereinafter referred to as a surveillance camera) 100, which is an example of an imaging device according to an embodiment of the present invention. The surveillance camera 100 can function as an image surveillance system together with a surveillance device capable of acquiring an image from the surveillance camera 100 by, for example, wired communication or wireless communication.

The image sensor unit 5 is mounted on the lens barrel 4. The lens barrel 4 to which the image sensor unit 5 is mounted is fixed to the pan-tilt rotation unit 6 so as to be rotatable in the pan, tilt, and rotation directions. The cover 2 and the pan-tilt rotation unit 6 are fastened by the fastening screw 1 with the dome cover 3 sandwiched between them.

FIG. 2 is a cross-sectional view of a lens barrel 4 equipped with an image sensor unit 5. FIG. 3 is an exploded perspective view of the lens barrel 4 equipped with the image sensor unit 5.

The lens barrel 4 has a first lens group L1 and L2, a second lens group L3, a third lens group L4, a fourth lens group L5, and a fifth lens group L6 in this order from the subject side to the image plane side. The first lens group L1, L2 to the fifth lens group L6 constitute an imaging optical system. The first lens groups L1 and L2 are fixed in the direction (optical axis direction) along the optical axis OA of the imaging optical system. The second lens group L3 moves in the direction of the optical axis to perform a scaling operation (zooming). The third lens group L4 is fixed in the optical axis direction. The fourth lens group L5 moves in the direction of the optical axis to perform a focusing operation (focusing). The fifth lens group L6 is fixed in the optical axis direction.

The infrared cut filter OF1 transmits or blocks light rays in a specific wavelength range by moving in a direction orthogonal to the optical axis OA (direction orthogonal to the optical axis) and being inserted into and removed from the optical path of light from the imaging optical system. In the present embodiment, the case where the infrared cut filter OF1 is used as an example of the optical filter inserted into and removed from the optical path will be described, but the optical filter is not limited to the infrared cut filter OF1. The low-pass filter OF2 is fixed in the optical axis direction and transmits or blocks light rays in a specific wavelength range. The image pickup device IS includes a photoelectric conversion element such as a CCD sensor or a CMOS sensor, and photoelectrically converts a subject image (optical image) imaged by the image pickup optical system.

The first lens barrel 12 holds the first lens groups L1 and L2.

The second lens barrel 21 holds the second lens group L3. By engaging the sleeve portion 22 provided on the second lens barrel 21 with the guide bar 24, the second lens barrel 21 is supported so as to be movable in the optical axis direction. By engaging the U groove 23 provided in the second lens barrel 21 with the guide bar 25, the rotation of the second lens barrel 21 around the guide bar 24 is restricted. The rack member 26 is fixed to the second lens barrel 21 in a state of being urged in the optical axis direction and the rotation direction by a rack spring (not shown). Further, the rack member 26 is engaged with the screw portion of the stepping motor 54, and moves in the optical axis direction together with the second lens barrel 21 by the rotation of the screw portion.

The third lens barrel 32 is sandwiched between the first lens barrel 12 and the fifth lens barrel 51, which will be described later, and holds the third lens group L4. The aperture unit 31 is fixed to the third lens barrel 32, and controls the aperture value by driving the aperture blades to change the aperture diameter.

The fourth lens barrel 41 holds the fourth lens group L5. When the sleeve portion 42 provided on the fourth lens barrel 41 engages with the guide bar 45, the fourth lens barrel 41 is movably supported in the optical axis direction. By engaging the U groove 43 provided in the fourth lens barrel 41 with the guide bar 46, the rotation of the fourth lens barrel 41 around the guide bar 45 is restricted. The rack member 44 is fixed to the fourth lens barrel 41 in a state of being urged in the optical axis direction and the rotation direction by a rack spring (not shown). Further, the rack member 44 is engaged with the screw portion of the stepping motor 55, and moves in the optical axis direction together with the fourth lens barrel 41 by the rotation of the screw portion.

The fifth lens barrel 51 is connected to the first lens barrel 12 by a screw 11, and holds the fifth lens group L6. Stepping motors 54, 55, 56 and FPCs (Flexible printed circuits) (not shown) are fixed to the fifth lens barrel 51.

The filter holding frame (filter holding member) 60 holds the infrared cut filter OF1. When the sleeve portion 61 provided on the filter holding frame 60 engages with the guide bar 63, the filter holding frame 60 is movably supported in the direction orthogonal to the optical axis. By engaging the U groove 62 provided in the filter holding frame 60 with the guide bar 64, the rotation of the filter holding frame 60 around the guide bar 63 is restricted. The rack member 65 is fixed to the filter holding frame 60 in a state of being urged in the directions orthogonal to the optical axis and in the rotational direction by a rack spring (not shown). Further, the rack member 65 is engaged with the screw portion of the stepping motor 56, and moves in the direction orthogonal to the optical axis together with the filter holding frame 60 by the rotation of the screw portion. When the filter holding frame 60 is inserted into the optical path, infrared light is cut from the light incident on the image sensor IS, and a light ray suitable for generating a normal color image is obtained. When the filter holding frame 60 is retracted from the optical path, a light beam containing infrared light is incident on the image sensor IS, so that a larger amount of light can be obtained so that the image can be taken even under low illuminance such as at night.

The guide bar 25 is sandwiched between the first lens barrel 12 and the third lens barrel 32. The guide bars 24 and 45 are sandwiched between the first lens barrel 12 and the fifth lens barrel 51. The guide bar 46 is sandwiched between the third lens barrel 32 and the fifth lens barrel 51. The guide bars 63 and 64 are sandwiched between the fifth lens barrel 51 and the tilt base 71 described later, and are arranged on the subject side of the plane on which the infrared cut filter OF1 is inserted / removed (moved) in the optical axis direction. As a result, the infrared cut filter OF1 can be arranged close to the image sensor unit 5 without interfering with the image sensor unit 5 when it is tilted and rotated.

The photo interrupters 52 and 53 are fixed to the FPC by soldering. The FPC is connected to the aperture unit 31, the stepping motors 54, 55, 56, and the photo interrupters 52, 53, and is activated by energization.

The photo interrupter 52 is arranged on the moving region of the second lens barrel 21. The position of the second lens barrel 21 is controlled by the output of the photo interrupter 52 and the number of drive pulses of the stepping motor 54.

The photo interrupter 53 is arranged on the moving region of the fourth lens barrel 41. The position of the fourth lens barrel 41 is controlled by the output of the photo interrupter 53 and the number of drive pulses of the stepping motor 55.

On the moving region of the filter holding frame 60, a photo interrupter (not shown) which is fixed to the FPC by soldering and activated by energization is arranged. The position of the filter holding frame 60 is controlled by the output of the photo interrupter (not shown) and the number of drive pulses of the stepping motor 56.

The tilt base 71 holds the image sensor unit 5 so as to be rotatable in the tilt direction with respect to the optical axis OA (rotatably about the tilt axis 87 which is the tilt rotation axis), and is fixed to the fifth lens barrel 51. Has been done.

4 and 5 are perspective views and cross-sectional views of the image sensor holding unit 86, respectively. By inserting the low-pass filter OF2 and the rubber 82 into the image sensor holder (image sensor holding member) 80 in this order and fixing the sensor sheet metal 83 to the image sensor holder 80, the low-pass filter OF2 and the rubber 82 are sandwiched. The image sensor IS is soldered to a circuit board 84 that is electrically connected to the image sensor IS, and is fixed to the sensor sheet metal 83 with an adhesive. The circuit board 84 is connected to the drive circuit board (not shown) of the second lens barrel 21, the fourth lens barrel 41, the aperture unit 31, the filter holding frame 60, and the image sensor unit 5 via the sensor FPC85. The image sensor holder 80 is rotatably held in the tilt direction with respect to the optical axis OA via a bearing 72 supported by the tilt base 71 and a bearing 77 supported by the bearing holder 78 fixed to the tilt base 71. Will be done. A wave washer 75 and a bearing washer 76 are arranged between the image sensor holder 80 and the bearing 77. The wave washer 75 and the bearing washer 76 urge the image sensor holder 80 in a direction parallel to the tilt rotation axis.

A stepping motor 73 is fixed to the tilt base 71. A worm gear 74 is fixed to the motor shaft of the stepping motor 73 by press fitting or the like. The image sensor holder 80 is integrally provided with a worm wheel 81 that meshes with the worm gear 74. The stepping motor 73 is connected to the FPC, and the worm wheel 81 is rotationally driven by rotationally driving the worm gear 74 by energization. By using the worm gear 74 and the worm wheel 81 for the rotational drive, the reduction ratio can be increased without combining a large number of gears, so that it is possible to suppress an increase in the size of the rotational mechanism.

With these configurations, the image sensor unit 5 can be rotationally driven in the tilt direction with respect to the optical axis OA by transmitting the driving force from the stepping motor 73.

The tension spring (biasing portion) 79 is attached to the tilt base 71 and the image sensor holder 80 to generate an urging force in the tension direction, thereby removing the backlash between the worm wheel 81 and the worm gear 74 and achieving high accuracy. Tilt rotation drive is possible.

A photo interrupter (not shown) fixed to the tilt base 71 is arranged on the tilt rotation region of the image sensor unit 5. The tilt rotation position of the image sensor unit 5 is controlled by the output of the photo interrupter (not shown) and the number of drive pulses of the stepping motor 73.

Hereinafter, the constituent blocks of the surveillance camera system will be described with reference to FIG. FIG. 6 is a block diagram of a surveillance camera system. The surveillance camera system includes a camera 101 and an operation unit 102 that operates the camera 101, and both are connected via a communication means 103.

The camera 101 includes a control CPU (control unit) 104 that controls pan, tilt, rotation, and the like in response to operations from the operation unit 102.

The pan position detecting means 117 detects the pan angle and the pan direction of the camera 101. The tilt position detecting means 118 detects the tilt angle and tilt direction of the camera 101. The rotation position detecting means 119 detects the rotation angle and the rotation angle of the camera 101. The detection result of each detection means is notified to the control CPU 104.

The storage unit 200 stores the number of drive pulses of the stepping motor of the pan drive unit 105, the number of drive pulses of the stepping motor of the tilt drive unit 106, and the number of drive pulses of the stepping motor of the rotation drive unit 107. The control CPU 104 can read the information stored in the storage unit 200 at any time.

The control CPU 104 calculates the number of drive pulses of the stepping motor of the pan drive unit 105 when driving to a predetermined position based on the detection result of the pan position detection means 117 and the number of pan drive motor drive pulses stored in the storage unit 200. To do. Further, the control CPU 104 has the number of driving pulses of the stepping motor of the tilt driving unit 106 when driving to a predetermined position based on the detection result of the tilt position detecting means 118 and the number of driving pulses of the tilt driving motor stored in the storage unit 200. Is calculated. Further, the control CPU 104 is the number of drive pulses of the stepping motor of the rotation drive unit 107 when driving to a predetermined position based on the detection result of the rotation position detection means 119 and the number of rotation drive motor drive pulses stored in the storage unit 200. Is calculated.

The zoom lens drive motor drive pulse number detecting means 113 detects the drive pulse number of the stepping motor of the zoom lens drive unit 108. The focus lens drive motor drive pulse number detecting means 114 detects the drive pulse number of the stepping motor of the focus lens drive unit 109. The image sensor tilt drive motor drive pulse number detecting means 115 detects the number of drive pulses of the stepping motor of the image sensor tilt drive unit 110. The infrared cut filter insertion / extraction motor drive pulse number detecting means 116 detects the number of drive pulses of the stepping motor of the infrared cut filter insertion / extraction drive unit (insertion / extraction drive unit) 112 capable of inserting / removing the infrared cut filter OF1 with respect to the optical path. To do. The detection result of each detection means is notified to the control CPU 104.

The storage unit 200 stores the number of drive pulses of the stepping motor 54, the number of drive pulses of the stepping motor 55, and the number of drive pulses of the stepping motor 73. Further, the storage unit 200 stores the number of drive pulses of the stepping motor 56. The control CPU 104 can read the information stored in the storage unit 200 at any time.

The control CPU 104 calculates the tilt rotation angle of the image sensor unit 5 based on the detection result of the image sensor tilt drive motor drive pulse number detecting means 115 and the image sensor tilt drive motor drive pulse number. Further, the control CPU 104 determines the presence / absence of tilt rotation and the tilt rotation direction. Further, the control CPU 104 calculates the number of drive pulses of the stepping motor 54 when driving to a predetermined position based on the detection result of the zoom lens drive motor drive pulse number detecting means 113 and the number of zoom lens drive motor drive pulses. Further, the control CPU 104 calculates the number of drive pulses of the stepping motor 55 when driving to a predetermined position based on the detection result of the focus lens drive motor drive pulse number detecting means 114 and the number of focus lens drive motor drive pulses. Further, the control CPU 104 calculates the number of drive pulses of the stepping motor 73 when driving to a predetermined position based on the detection result of the image sensor tilt drive motor drive pulse number detecting means 115 and the number of image sensor tilt drive motor drive pulses. .. Further, the control CPU 104 determines the number of drive pulses of the stepping motor 56 when driving to a predetermined position based on the detection result of the infrared cut filter insertion / extraction motor drive pulse number detection means 116 and the number of infrared cut filter insertion / extraction motor drive pulses. Calculate.

The diaphragm drive unit 111 drives the diaphragm blades of the diaphragm unit 31.

The operation unit 102 includes an operation unit CPU 136. The operation unit CPU 136 includes pan, tilt and rotation operations of the camera 101, drive operations of the second lens group L3 and the fourth lens group L5, tilt rotation drive operation of the image sensor unit 5, and drive operation of the aperture blades of the aperture unit 31. It is connected to the operation unit 137 that instructs the insertion / removal drive operation of the infrared cut filter OF1. Therefore, the operator (operator) can operate the operation unit 137 to shoot the subject under desired shooting conditions while checking the image shot by the camera 101 on the monitor (not shown) and display it on the display means 135. ..

Hereinafter, the insertion / removal drive of the infrared cut filter OF1 will be described with reference to FIGS. 7 to 9. FIG. 7 is a cross-sectional view of the infrared cut filter insertion / extraction drive unit 112 in a state where the image sensor unit 5 is not tilted. FIG. 8 is a cross-sectional view of the infrared cut filter insertion / extraction drive unit 112 in a state of tilt rotation so that the upper part of the image sensor unit 5 is on the subject side. FIG. 9 is a cross-sectional view of the infrared cut filter insertion / extraction drive unit 112 in a state of tilt rotation so that the lower part of the image sensor unit 5 is on the subject side. Here, the short side direction of the image sensor IS is defined as the Y direction. Further, the infrared cut filter OF1 can be retracted in the + Y direction (first direction) or in the −Y direction (second direction) opposite to the + Y direction. That is, the insertion / removal direction of the infrared cut filter OF1 is parallel to the short side direction of the image sensor IS.

FIG. 7A shows a state in which the infrared cut filter OF1 is inserted into the optical path, and FIG. 7B shows a state in which the infrared cut filter OF1 is retracted from the optical path. When the image sensor unit 5 is not tilted, the infrared cut filter OF1 retracts in the −Y direction as shown in FIG. 7B.

FIG. 8A shows a state in which the infrared cut filter OF1 is inserted into the optical path, and FIG. 8B shows a state in which the infrared cut filter OF1 is retracted from the optical path. When the tilt rotation is performed so that the upper part of the image sensor unit 5 is on the subject side, the infrared cut filter OF1 retracts in the −Y direction as shown in FIG. 8B.

FIG. 9A shows a state in which the infrared cut filter OF1 is inserted into the optical path, and FIG. 9B shows a state in which the infrared cut filter OF1 is retracted from the optical path. When the tilt rotation is performed so that the lower part of the image sensor unit 5 is on the subject side, the infrared cut filter OF1 retracts in the + Y direction as shown in FIG. 9B.

In the present embodiment, as shown in FIGS. 8 and 9, the infrared cut filter OF1 is controlled in the insertion / extraction direction (insertion / extraction direction) according to the direction of tilt rotation of the image sensor unit 5. Further, as shown in FIGS. 8 and 9, the plane through which the infrared cut filter OF1 is inserted / removed is included in a region (rotation region) in which the image sensor unit 5 tilts and rotates in the optical axis direction. In other words, the infrared cut filter OF1 is arranged so that the infrared cut filter OF1 and the image sensor unit 5 overlap in the optical axis direction when the image sensor unit 5 tilts and rotates.

Hereinafter, the insertion / removal drive processing of the infrared cut filter OF1 will be described with reference to FIGS. 10A and 10B. FIG. 10A is a flowchart showing a retract direction setting process of the infrared cut filter OF1. Here, the tilt rotation direction in which the upper part of the image sensor unit 5 is on the subject side is defined as the − (minus) direction, and the tilt rotation direction in which the lower part is on the subject side is defined as the + (plus) direction. Further, the infrared cut filter OF1 can be retracted in the + Y direction or the −Y direction of FIGS. 7 to 9.

In step S101, the control CPU 104 determines whether or not the image sensor unit 5 is tilt-rotated. If it is determined that the image sensor unit 5 is tilt-rotated, the process proceeds to step S102. When it is determined that the image sensor unit 5 is not tilt-rotated, the process ends.

In step S102, the control CPU 104 determines whether or not the tilt rotation direction of the image sensor unit 5 is the + (plus) direction. If the tilt rotation direction of the image sensor unit 5 is the + (plus) direction, the process proceeds to step S103, and if the tilt rotation direction is not the + (plus) direction, that is, the − (minus) direction, the process proceeds to step S104.

In step S103, the control CPU 104 sets the retract direction of the infrared cut filter OF1 in the + Y direction.

In step S104, the control CPU 104 sets the retract direction of the infrared cut filter OF1 in the −Y direction.

FIG. 10B is a flowchart showing an insertion / removal drive process of the infrared cut filter OF1.

In step S201, the control CPU 104 determines whether to switch between the day mode and the night mode. Here, the shooting mode will be described. When giving priority to the color reproducibility of the subject, there is a so-called day mode in which an infrared cut filter is inserted in the optical path to prevent infrared light from entering the image sensor. On the other hand, in a dark environment, shooting is performed in a low-light environment, so in order to improve the recognition of the subject, the infrared cut filter is removed from the optical path, and not only visible light but also infrared light is used as the image sensor. There is a so-called night mode in which the image is captured and taken.

If it is determined in step S201 that the shooting mode is to be switched, the process proceeds to step S202. If it is determined not to switch the shooting mode, the process ends.

In step S202, the control CPU 104 retracts the infrared cut filter OF1 in the direction set in step S103 or step S104.

As described above, in the present embodiment, the infrared cut filter OF1 is used as the image sensor unit by changing the retracting direction of the insertion / removal drive of the infrared cut filter OF1 in accordance with the tilt rotation direction of the image sensor unit 5. It is possible to arrange it close to 5. That is, it is possible to provide an image pickup device that can be miniaturized while incorporating the tilt rotation mechanism of the image pickup element and the optical filter insertion / removal mechanism.

Although the surveillance camera capable of pan-tilt rotation has been described in the present embodiment, it may be a fixed surveillance camera with interchangeable lenses.

In the present embodiment, in order to increase the depth of field, the configuration in which the image sensor unit 5 is tilted relative to the image pickup optical system has been described, but at least one of the image pickup element unit 5 and the image pickup optical system is used. It may be tilted.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

IS image sensor OF1 infrared cut filter (optical filter)
100 Imaging device 104 Control CPU
106 Tilt drive unit 110 Image sensor tilt drive unit (tilt drive unit)
112 Infrared cut filter insertion / extraction drive unit (insertion / extraction drive unit)

Claims (9)

With the image sensor
A tilt drive unit for rotationally driving at least one of the image pickup optical system and the image pickup element with respect to a plane orthogonal to the optical axis of the image pickup optical system.
An insertion / removal drive unit for driving the optical filter in / out of the optical path of light from the imaging optical system,
It has a control unit that determines the rotation direction of the image sensor and controls the tilt drive unit and the insertion / removal drive unit to drive the image sensor.
The control unit determines the insertion / removal direction of the optical filter based on the rotation direction, and controls the insertion / removal drive unit based on the insertion / removal direction. It further has a filter holding member that holds the optical filter and is inserted into and removed from the optical path by the insertion / extraction drive unit.
The imaging device according to claim 1, wherein the guide bar that supports the filter holding portion is arranged on the subject side of the plane on which the filter holding portion moves in the optical axis direction of the imaging optical system. It further has a filter holding member that holds the optical filter and is inserted into and removed from the optical path by the insertion / extraction drive unit.
The image pickup apparatus according to claim 1 or 2, wherein the insertion / removal direction of the filter holding portion is parallel to the short side direction of the image pickup element. It further has an image sensor holding member that holds the image sensor and rotates about the tilt rotation axis.
Claims 1 to 3 are characterized in that the optical filter is arranged so that the plane into which the optical filter is inserted and removed is included in the rotation region of the image pickup element holding member in the optical axis direction of the image pickup optical system. The image pickup apparatus according to any one of the above items. The image pickup apparatus according to any one of claims 1 to 4, wherein the tilt drive unit transmits a driving force to the image pickup element by using a worm gear and a worm wheel that meshes with the worm gear. The imaging device according to claim 5, further comprising an urging portion for urging the worm gear to the worm wheel. The optical filter can be retracted from the optical path in a first direction orthogonal to the optical axis direction of the imaging optical system, or in a second direction opposite to the first direction.
The control unit is a case where the optical filter inserted in the optical path is retracted from the optical path, and the imaging optical system and the imaging element are on the first direction side in the plane into which the optical filter is inserted. When at least one of the above is located, the optical filter is retracted in the second direction, and when at least one of the imaging optical system and the imaging element is located on the side of the second direction in the plane, the optical filter is moved. The imaging device according to any one of claims 1 to 6, wherein the image pickup device is retracted in the first direction. The imaging device according to any one of claims 1 to 7.
An image monitoring system including a monitoring device capable of acquiring an image from the image pickup device. A control method for an image pickup device having an image pickup element and an optical filter that is inserted and removed from the optical path of light from the image pickup optical system.
A step of rotationally driving at least one of the image pickup optical system and the image sensor.
The step of determining the rotation direction of the image sensor and
A step of determining the insertion / extraction direction of the optical filter based on the rotation direction, and
A control method for an imaging device, which comprises a step of inserting and removing the optical filter based on the insertion / removal direction.