JP2010278869A - Imaging apparatus and imaging system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform a manual adjustment of an imaging optical system in which an angle of view of imaging or a focusing state or the like in a state where a cover member is mounted, is taking into account. <P>SOLUTION: An optical attachment 80 is used for an imaging apparatus including: imaging units 20, 36 having a first imaging optical system 20; adjusting mechanisms 26, 35 for enabling at least either a focusing state or a direction to be adjusted through manual operation; and a cover member 11 having a first optical part 11a which is mounted on a holding member 10 to cover the imaging units and constitutes a second imaging optical system together with the first imaging optical system. The optical attachment 80 is removably mounted in the imaging apparatus in a state where the cover member is not mounted on the holding member. The optical attachment 80 includes a second optical part 81 which is optically equivalent to the first optical part, and includes a shape forming a space wherein the manual operation of each of the adjusting mechanisms can be performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  This case relates to an imaging apparatus used for a monitoring camera or the like.

As an imaging device such as a surveillance camera, the imaging unit is housed inside a transparent cover member (hemispherical dome member) to protect the imaging unit including the imaging optical system and imaging device and to make the surveillance camera inconspicuous. So-called dome cameras are widely used.
In many of these dome cameras, as disclosed in Patent Document 1, an imaging optical system called a varifocal lens that can manually adjust a focal length (an imaging angle of view) and a focal state (a focus) is used. .
The varifocal lens has a simple configuration and high reliability because it does not have a drive system for remote control, but adjusts the field angle of view and the focus by direct manual operation. For this reason, varifocal lenses are generally used for monitoring cameras for fixed-point monitoring applications that do not require frequent setting changes, including dome cameras.
Furthermore, as disclosed in the same document, many dome cameras are equipped with a pan head that changes the direction (imaging direction) of the imaging optical system.
In such a dome camera, the adjustment of the imaging angle of view, the focus, and the imaging direction is performed with the dome member removed, and the adjustment mechanism such as the imaging unit and the imaging angle of view is covered by the dome member after the adjustment. .

However, covering the imaging unit with the dome member after adjusting the focus of the imaging optical system places a high refractive index member having a certain thickness on the front surface of the imaging optical system. As a result, the air conversion distance between the subject and the subject changes compared to before the imaging unit is covered with the dome member, and as a result, the imaging unit is out of focus. Before covering the image pickup unit with the dome member, it is extremely difficult to adjust the focus in anticipation of the focus change after the cover.
Patent Document 2 discloses a dome camera that can adjust the position of an image sensor in the optical axis direction of an imaging optical system after mounting a dome member in order to correct a focus change caused by the mounting of the dome member. Yes.

Japanese Patent No. 3363672 JP 2008-17258 A

However, the dome camera disclosed in Patent Document 2 includes a special drive mechanism for adjusting the position of the image sensor. This complicates the structure of the dome camera and may increase the size of the dome camera.
In addition, the dome member disposed in front of the imaging optical system has an optical action as a meniscus lens. For this reason, the imaging angle of view also changes. Thereby, imaging will be performed with an imaging angle of view different from the imaging angle of view adjusted with the dome member removed. For example, there is a possibility that a subject to be imaged is not imaged, or a subject that should not be imaged is imaged.

  The present invention provides an optical attachment capable of easily performing manual adjustment of an imaging optical system in anticipation of an imaging field angle, a focus state, and the like with a cover member attached without providing a special drive mechanism. And an imaging system including the same.

An optical attachment according to one aspect of the present invention includes an imaging unit having a first imaging optical system, a holding member that holds the imaging unit, and at least a focal length, a focal state, and an orientation of the first imaging optical system. An adjustment mechanism that enables adjustment by one manual operation, and a first optical unit that is mounted on the holding member so as to cover the imaging unit and the adjustment mechanism, and constitutes the second imaging optical system together with the first imaging optical system And an imaging device having a cover member including
The optical attachment is detachably attached to the imaging apparatus in a state where the cover member is not attached to the holding member. The optical attachment has a second optical unit that is optically equivalent to the first optical unit, and has a shape that forms a space that allows manual operation of the adjustment mechanism.
In addition, another aspect of the present invention including the optical attachment and an imaging device using the optical attachment is configured.

  According to the present invention, without providing a special drive mechanism for adjusting the focal length, the focal state, and the imaging direction, the focal length and the focal point equivalent to the state in which the cover member is mounted with the cover member removed. The adjustment mechanism can be manually adjusted while checking the state and the imaging direction.

Sectional drawing which shows the structure of the dome camera in which the optical attachment which is Example 1 of this invention is used. FIG. 3 is a cross-sectional view illustrating a configuration of an optical attachment according to the first embodiment. FIG. 3 is a diagram illustrating an optical action of the optical attachment according to the first embodiment. The side view which shows the dome camera in the state which mounted | wore the optical attachment of Example 1. FIG. The perspective view which shows the optical attachment which is Example 2 of this invention. Sectional drawing which shows the dome camera in the state which mounted | wore with the optical attachment of Example 2. FIG. Sectional drawing which shows the dome camera in the state which mounted | wore with the optical attachment of Example 2. FIG. Sectional drawing which shows the dome camera in the state which mounted | wore with the optical attachment which is Example 3 of this invention. 5 is a flowchart illustrating an imaging field angle, focus adjustment, and imaging direction adjustment process using the optical attachments of Examples 1 to 3.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration of a dome camera as an imaging apparatus using an optical attachment that is Embodiment 1 of the present invention. The dome camera and the optical attachment constitute an imaging system.
In FIG. 1, a dome member (hereinafter simply referred to as a dome) 11 as a cover member formed of a transparent member, and a casing (holding member) 10 constituted by an upper case 12 and a lower case 13 have cross sections thereof. Show.
The dome 11 is a spherical dome (first first) having an outer diameter R1 and an inner diameter R2 (thickness = R1-R2) centering on the intersection of the three axes of the X, Y, and Z axes shown in the figure. Optical part) 11a and a flange part 11b formed on the outer periphery of the dome part 11a. The dome 11 is assembled to the upper case 12 from below in the figure, and the flange portion 11b is sandwiched between the receiving portion of the upper case 12 and the holding member 14 to be attached (fixed) to the upper case 12 (casing 10). Is done. The pressing member is fixed to the upper case 12 by screws 15. The lower case 13 is coupled to the upper case 12 by screws (not shown).

Inside the casing 10, an imaging unit having a varifocal lens 20 as a first imaging optical system and an imaging element holder 36 to be described later, a lens head that supports the imaging unit, circuit boards 63 and 71, and Is housed. Note that FIG. 1 shows a cross section of the right half of the imaging unit and the lens head.
The varifocal lens 20 includes a focus lens unit 22 and a zoom (variation) lens unit 31. The focus lens unit 22 is held by a focus lens barrel 23, and the zoom lens unit 31 is held by a zoom lens barrel 32.
The focus barrel 23 is disposed inside the outer barrel 21 so as to be movable in the optical axis direction of the varifocal lens 20. The focus barrel 23 is provided with a guide pin 24 that engages with a long hole portion 21 a formed in the inner barrel 21 so as to extend in the optical axis direction.
A focus ring 25 is arranged on the outer periphery of the outer barrel 21 so as to be rotatable around the optical axis. The focus ring 25 has a cam groove portion 25a on its inner peripheral surface. A guide pin 24 is engaged with the cam groove 25a. The focus ring 25 is biased toward the subject side (upward in the drawing) by the spring ring 28 with respect to the outer barrel 21. With this structure, the focus ring 25 can rotate around the optical axis while generating an appropriate frictional resistance with the outer barrel 21 and can be stably stopped at a desired rotational position. In order to improve operability, a focus adjustment lever 26 that can be manually operated is attached to the focus ring 25.
When the focus ring 25 is rotated by manual operation of the focus adjusting lever 26, the guide pin 24 is moved in the optical axis direction by the lift of the cam groove portion 25a while being prevented from rotating around the optical axis by the elongated hole portion 21a. 22 moves in the optical axis direction. Thus, a focus adjustment mechanism for manually adjusting the focus state (focus) of the varifocal lens 20 by moving the focus lens unit 22 is configured.
The zoom lens barrel 32 is disposed inside the outer lens barrel 21 so as to be movable in the optical axis direction. The zoom lens barrel 32 is provided with a guide pin 33 that engages with a long hole portion 21b formed in the inner lens barrel 21 so as to extend in the optical axis direction.
A zoom ring 34 is disposed on the outer periphery of the outer barrel 21 so as to be rotatable around the optical axis. The zoom ring 34 has a cam groove 34a on its inner peripheral surface. A guide pin 33 is engaged with the cam groove 34a. The zoom ring 34 is biased toward the subject by a spring ring 38 with respect to the outer barrel 21. With this structure, the zoom ring 34 can rotate around the optical axis while generating an appropriate frictional resistance with the outer barrel 21 and can be stably stopped at a desired rotational position. In order to improve operability, a zoom adjustment lever 35 that can be manually operated is attached to the zoom ring 34.
When the zoom ring 34 is rotated by manual operation of the zoom adjustment lever 35, the guide pin 33 is moved in the optical axis direction by the lift of the cam groove portion 34a while being prevented from rotating around the optical axis by the long hole portion 21b. 31 moves in the optical axis direction. As a result, a zoom adjustment mechanism for manually adjusting the focal length (imaging field angle) of the varifocal lens 20 by moving the zoom lens unit 31 is configured.
An imaging element holder 36 is fixed to the end of the outer barrel 21 on the image plane side. The imaging element holder 36 has a flange portion and a cylindrical portion, and the cylindrical portion is inserted into the hole 41 a of the tilt movable member 41. The imaging element holder 36 is attached to the tilt movable member 41 in a state where the flange portion is pressed against the tilt movable member 41 from the subject side by the spring ring 37.
With such a structure, the imaging unit can rotate around the optical axis (hereinafter referred to as lens rotation) as indicated by an arrow 27 while generating an appropriate frictional resistance with the tilt movable member 41. And can be stably stopped at a desired rotational position. By rotating the imaging unit around the optical axis, the tilt of the imaging screen can be adjusted. Thus, the dome camera of the present embodiment has a lens rotation adjustment mechanism.
A pair of tilt shafts 42 provided on the tilt movable member 41 is inserted into a tilt shaft hole 44 a formed on the pan movable member 44, and the spring ring 43 prevents the tilt shaft hole 44 a from coming off. With such a structure, the tilt movable member 41 can be tilted and rotated about the tilt axis (X axis) as indicated by an arrow 45. In order to hold the tilt movable member 41 at a desired rotational position, a screwing structure (not shown) can be used.
The pan movable member 44 is provided with a flange portion 44 b, and the flange portion 44 b is disposed on the inner periphery of a ring-shaped convex portion 52 formed on the pan head base member 51. The pan movable member 44 is held between a thrust holding member 46 fixed to the convex portion 52 with a screw 47 and the pan head base member 51. Thereby, the pan movable member 44 shows the pan axis (Y axis: in the figure, the pan axis coincides with the optical axis of the varifocal lens 20) on the pan head base member 51 as indicated by an arrow 48. Pan rotation is possible around).
The pan head base member 51 is fixed to a receiving portion 13 a provided in the lower case 13 with a screw 53.
As described above, the imaging unit can rotate around the tilt axis and the pan axis, which are two axes orthogonal to each other, and can also rotate around the optical axis of the varifocal lens 20. In order to hold the pan movable member 44 at a desired rotational position, a screwing structure (not shown) can be used. The tilt movable member 41, the pan movable member 44 and the pan head base member 51 constitute a pan head as a direction adjusting mechanism.
The orientation of the varifocal lens 20 without changing the distance between the subject-side tip (hereinafter also referred to as the front end) of the varifocal lens 20 and the inner surface of the dome member 11 by tilt rotation and pan rotation on the camera platform. The (imaging direction) can be changed. The adjustment of the orientation of the varifocal lens 20 is performed by a manual operation, similar to the adjustment of the imaging field angle and the focus.
In the present embodiment, a case will be described in which the focal length, the focal state, and the orientation (and further the lens rotation position) of the varifocal lens 20 can be adjusted manually. However, in the present invention, it is only necessary that at least one manual operation can be adjusted among the focal length, the focal state, and the orientation (and the lens rotation position).
Next, the image sensor holder 36 and the surrounding structure will be described. A recess is formed inside the image sensor holder 36, and a low pass / infrared cut filter 60 formed by bonding a low pass filter and an infrared wavelength cut filter in the recess, a CCD sensor, and a COMS. An image sensor 62 such as a sensor is disposed. A spacer 61 is sandwiched between the low-pass / infrared cut filter 60 and the image sensor 62.
The imaging element 62 is mounted on the imaging circuit board 63 with a metal heat sink 64 interposed therebetween. A terminal 62 a of the image sensor 62 is soldered to a circuit pattern formed on the image pickup circuit board 63.
The imaging circuit board 63 is fixed to the imaging element holder 36 by screws (not shown). Thereby, the low pass / infrared cut filter 60 is also fixed. The imaging circuit board 63 is provided with a connector 65, and an electrical cable 66 connected to a main circuit board 71 described later is connected to the connector 65.
The main circuit board 71 is fixed to the receiving portion 13 b provided in the lower case 13 with screws 74. The main circuit board 71 is provided with a connector 72, and the electrical cable 66 described above is connected to the connector 72. As a result, the electrical signal output from the image sensor 62 is input to a signal processing circuit (not shown) on the main circuit board 71. The signal processing circuit generates an image signal based on the electrical signal from the image sensor 62. The generated image signal is output to an external device (not shown) through an electric cable 74 connected to a connector 73 provided on the main circuit board 71. The external device displays an image (captured image) corresponding to the image signal.
As described above, in the dome camera of the present embodiment, the dome 11 is mounted on the casing 10 so as to cover the imaging unit and each adjustment mechanism. Of the dome 11, the dome portion 11a is a member having a high refractive index whose thickness is R1-R2. For this reason, the dome part 11a and the varifocal lens 20 constitute a second imaging optical system (an imaging optical system from the dome part 11a to the imaging element 62).
In FIG. 2, the optical attachment 80 of a present Example is shown. FIG. 3 is an enlarged view of portion A in FIG. 1, and the optical attachment 80 is indicated by a two-dot chain line.
The optical attachment 80 is detachably attached to an imaging unit that is a part of the dome camera in a state where the dome 11 is not attached to the casing 10. Specifically, the optical attachment 80 is attached to the outer periphery of the focus ring 25 of the varifocal lens 20 in the imaging unit in a state where the upper case 12 is removed from the lower case 13 together with the dome 11.
The optical attachment 80 includes an attachment barrel 82 and an attachment lens (second optical portion) 81 held by the first inner peripheral portion 82a of the attachment barrel 82. The attachment lens 81 is formed in a spherical shape having a first surface (outer surface) having a radius R1 and a second surface (inner surface) having a radius R2. In other words, the attachment lens 81 has a spherical shape having the same radius (and the same thickness) as the spherical shape of the dome portion 11a.
The attachment lens 81 is manufactured by cutting out a circular portion from a member (material) constituting the dome portion 11a of the dome 11 or a member having physical properties (refractive index, etc.) and a shape equivalent thereto. The
The outer peripheral portion of the focus ring 25 is inserted into the second inner peripheral portion 82 b of the attachment barrel 82. Then, a rib portion (positioning portion) 82 c protruding from the second inner peripheral portion 82 b to the inner peripheral side abuts against the upper end of the focus ring 25. Thereby, the attachment lens 81 has the same distance between the attachment lens 81 and the front end of the varifocal lens 20 as the distance between the dome portion 11a of the dome 11 and the front end of the varifocal lens 20. Positioned. Further, the attachment lens 81 is positioned so that the center of the spherical shape thereof coincides with the above-described intersection of the X axis, Y axis, and Z axis (intersection of the tilt axis and pan axis).
By positioning the attachment lens 81 in this way, the attachment lens 81 is optically equivalent to the dome portion 11a of the dome 11, and constitutes an optical system equivalent to the above-described second imaging optical system together with the varifocal lens 20. To do. The optical attachment 80 is fixed to the focus ring 25 by screws or light press fitting.
In FIG. 3, an alternate long and short dash line extending from the outer periphery of the focus lens unit 22 indicates the outermost light ray (maximum field angle light ray) 85 incident on the focus lens unit 22 in a state where the varifocal lens 20 is at the wide angle end. By setting the outer diameter of the attachment lens 81 so as to cover an angle range wider than the maximum field angle light beam 85, the optical attachment 80 does not cause vignetting at the wide angle end.

FIG. 4 shows a state in which the dome 11 and the upper case 12 are removed from the lower case 13 and the optical attachment 80 is attached to the varifocal lens 20. The pan movable member 44 is indicated by a two-dot chain line, and a portion where the varifocal lens 20 and the optical attachment 80 overlap is indicated by a solid line.
As shown in FIG. 4, the optical attachment 80 is attached to the front end portion of the varifocal lens 20 (focus ring 25), and exposes the focus adjustment lever 26 and the zoom adjustment lever 35 which are manual operation portions of the focus and zoom adjustment mechanism. Let (do not cover). Furthermore, even when the optical attachment 80 is mounted, manual adjustment of the imaging direction and the lens rotation position (manual operation of the direction adjustment mechanism and the lens rotation adjustment mechanism) is possible. That is, the optical attachment 80 has a shape that forms a space that allows manual operation of each adjustment mechanism in a state where the optical attachment 80 is attached to the varifocal lens 20.
For this reason, it is possible to adjust the imaging angle of view, the focus, the imaging direction, and the inclination of the screen while confirming a captured image equivalent to the state in which the dome 11 is mounted using the optical attachment 80. After these adjustments are completed, even if the optical attachment 80 is removed from the varifocal lens 20 and the upper case 12 is attached to the lower case 13 together with the dome 11, the adjusted imaging angle of view, focus, imaging direction, and screen inclination are maintained. Maintained.
The optical attachment 80 has a size and shape (structure) in which the dome 11 cannot be physically attached to the casing 10 unless it is removed. This is because if the dome 11 is mounted while the optical attachment 80 is mounted, the optical systems equivalent to each other are arranged in front of the varifocal lens 20, and each adjustment of the varifocal lens 20 is performed. This is because it cannot be performed. This is the same in other embodiments described later.

FIG. 5 shows an optical attachment 90 that is Embodiment 2 of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.
The optical attachment 90 has an optical part (second optical part) 90a formed so as to have a spherical shape by removing the parts on both sides of the dome part 11a of the dome 11 while leaving the center part. Further, the flange portion 90b uses the flange portion 11b of the dome 11. Therefore, the optical attachment 90 is detachably attached to the upper case 12 and attached to the lower case 13 (that is, the casing 10) together with the upper case 12.
FIG. 6 shows a state where the optical attachment 90 is mounted on the casing 10. The flange portion 90 b of the optical attachment 90 is sandwiched between the receiving portion of the upper case 12 and the pressing member 14. The holding member 14 is fixed to the upper case 12 by a stepped screw 95 via an elastic member 94 such as rubber or a spring washer. The flange portion 90 b is pressed against the receiving portion of the upper case 12 by the urging force of the elastic member 94 through the pressing member 14. Thereby, the optical attachment 90 can rotate around the pan axis as indicated by an arrow 91 while generating an appropriate frictional resistance between the receiving portion of the upper case 12 and the pressing member 14, and is desired. Can be stably stopped at the rotational position.
When the optical attachment 90 is attached to the casing 10, the optical portion 90a formed as described above has the center of the spherical shape so that it coincides with the intersection of the X axis, the Y axis, and the Z axis (intersection of the tilt axis and the pan axis). Is positioned. The optical unit 90a is positioned so that the distance between the optical unit 90a and the front end of the varifocal lens 20 is the same as the distance between the dome portion 11a of the dome 11 and the front end of the varifocal lens 20. Is done.
By positioning the optical part 90a in this way, the optical part 90a is optically equivalent to the dome part 11a of the dome 11, and is equivalent to the second imaging optical system described in the first embodiment together with the varifocal lens 20. Configure the optical system.
Further, by holding the optical part 90a by the flange part 90b, it is possible to structurally stabilize the optical characteristics when the optical attachment 90 is mounted.
The width of the optical unit 90a is set so as to cover an angle range wider than the maximum field angle light ray 85 at the wide angle end of the varifocal lens 20 shown in FIG.

The optical attachment 90 has an opening 90c between both ends in the width direction of the optical part 90a and the flange part 90b. Thereby, the optical attachment 90 exposes (not covers) the focus adjustment lever 26 and the zoom adjustment lever 35 in a state where the optical attachment 90 is attached to the casing 10. Furthermore, the imaging direction and the lens rotation position can be manually adjusted through the opening 90c. That is, the optical attachment 90 has a shape that forms a space that allows manual operation of each adjustment mechanism in a state where the optical attachment 90 is mounted on the casing 10.
Therefore, it is possible to adjust the imaging angle of view, the focus, the imaging direction, and the inclination of the screen while confirming a captured image equivalent to the state in which the dome 11 is mounted using the optical attachment 90. After the adjustment is completed, the optical attachment 90 is removed from the lower case 13 together with the upper case 12, and the upper case 12 with the optical attachment 90 replaced with the dome 11 is attached to the lower case 13. Direction and screen tilt are maintained.
As shown in FIG. 7, even if the orientation of the varifocal lens 20 is changed, the optical attachment 90 can rotate around the pan axis, so the optical unit 90a is disposed in front of the varifocal lens 20 (subject side). Can do. That is, the optical attachment 90 can be rotated with respect to the casing 10 in accordance with the change in the direction of the varifocal lens 20.
Further, since the opening 90c also moves in the rotation direction along with the rotation of the optical attachment 90, the imaging field angle, focus, imaging direction, and screen tilt can be adjusted through the opening 90c.

  In the optical attachment 90 of the present embodiment, the optical part 90 a has the same spherical length as the dome part 11 a of the dome 11. For this reason, it is possible to grasp in advance the vignetting of the imaging field angle by the end of the dome portion 11a when the dome 11 is mounted with the optical attachment 90 mounted.

  The optical attachment 90 may be attached to the upper case 12 using a magnet.

  The optical attachment 90 of this embodiment is also used for a dome camera in which the distance between the front end of the varifocal lens 20 and the dome portion 11a of the dome 11 is changed by changing the orientation of the varifocal lens 20. be able to.

In the second embodiment, the case where the optical attachment 90 is mounted on the upper case 12 so as to be rotatable around the pan axis has been described. However, as shown in FIG. 8, the optical attachment 90 is mounted on the pan movable member 44. You may make it do.
In FIG. 8, the mounting bracket 96 is attached to the flange portion 90b of the optical attachment 90 with screws 97a. Then, the mounting bracket 96 is attached to the pan movable member 44 with screws 97b.
Thereby, the optical attachment 90 rotates with pan rotation of the imaging unit. For this reason, the optical unit 90a is always arranged in front of the varifocal lens 20, and each adjustment of the varifocal lens 20 can be performed more easily than in the second embodiment.

FIG. 9 shows the flow of the adjustment process (adjustment method) of the imaging field angle, focus and imaging direction of the dome camera, which is performed using the optical attachments shown in the first to third embodiments.
When the adjustment process is started in step 101, in step 102, the dome 11 is removed from the dome camera to expose the imaging unit.
In step 103, the optical attachment is attached to the dome camera (varifocal lens 20, casing 10 or pan movable member 44). In step 104, a monitor that displays a captured image output from the dome camera is connected to the dome camera. In step 105, display of the captured image on the monitor is started.
Then, in step 106, while confirming the displayed captured image, the imaging unit is manually operated to adjust the imaging direction by panning or tilting the pan head, and further rotating the lens as necessary. Adjust the position.
Next, in step 107, while confirming the displayed captured image, the zoom adjustment lever 35 is manually operated to adjust the imaging field angle. Further, in step 108, the focus adjustment lever 26 is manually operated while confirming the displayed captured image to adjust the focus. Note that either step 107 and step 108 may be performed first or simultaneously.
In step 109, the adjusted captured image is confirmed on the monitor, readjustment is performed if necessary, and adjustment is terminated in step 110 if readjustment is not necessary.
In step 111, the optical attachment is removed. In step 112, the previously removed dome 11 is attached to the dome camera, and in step 113, the adjustment process is terminated.
Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.
For example, in each of the above embodiments, the case where the cover member and the optical portion of the optical attachment have a spherical shape has been described, but the present invention is also applied to a cover member and an optical attachment having a curved surface-shaped optical portion different from the spherical shape. Can be applied.

Without providing a special drive mechanism, it is possible to realize an optical attachment that can easily perform manual adjustment of the imaging optical system in anticipation of the imaging angle of view and the focus state with the cover member mounted.

DESCRIPTION OF SYMBOLS 10 Casing 20 Varifocal lens 25 Focus ring 26 Focus adjustment lever 34 Zoom ring 35 Zoom adjustment lever 36 Image sensor holder 41 Tilt movable member 44 Pan movable members 80 and 90 Optical attachment

Claims (6)

An image pickup unit having a first image pickup optical system, a holding member for holding the image pickup unit, and adjustment by manual operation of at least one of a focal length, a focus state, and an orientation of the first image pickup optical system are enabled. An adjustment mechanism, and a cover member that is attached to the holding member so as to cover the imaging unit and the adjustment mechanism, and includes a first optical unit that constitutes a second imaging optical system together with the first imaging optical system. Used for an imaging device having,
An optical attachment that is detachably attached to the imaging device in a state where the cover member is not attached to the holding member,
An optical attachment comprising: a second optical unit that is optically equivalent to the first optical unit; and a shape that forms a space that allows manual operation of the adjusting mechanism. The optical attachment according to claim 1, comprising the second optical unit and an opening for forming the space.   In the second optical unit, the distance between the second optical unit and the first imaging optical system is the same as the distance between the first optical unit and the first imaging optical system. The optical attachment according to claim 1, further comprising a positioning portion that positions so as to be. The imaging unit is rotatable around two axes orthogonal to each other, and the first optical unit has a spherical shape centering on the intersection of the two axes,
The second optical unit has a spherical shape having the same radius as the spherical shape of the first optical unit,
4. The optical attachment according to claim 1, wherein the optical attachment includes a positioning unit that positions a center of a spherical shape of the second optical unit at the intersection. 5. The imaging unit can be rotated so that the orientation of the first imaging optical system changes,
5. The optical attachment according to claim 1, wherein the optical attachment is attached to the imaging device so as to be rotatable in accordance with a change in the orientation of the first imaging optical system. 6. . An image pickup unit having a first image pickup optical system, a holding member for holding the image pickup unit, and adjustment by manual operation of at least one of a focal length, a focus state, and an orientation of the first image pickup optical system are enabled. An adjustment mechanism, and a cover member that is attached to the holding member so as to cover the imaging unit and the adjustment mechanism, and includes a first optical unit that constitutes a second imaging optical system together with the first imaging optical system. An imaging system comprising: an imaging device having the optical attachment according to claim 1; and an optical attachment according to claim 1.