JP2019003064A - Camera housing - Google Patents

Abstract

To provide a downsized camera housing that, when mounting an imaging lens in which an entire optical length varies due to zooming or focusing to a camera housing, does not interfere with front surface glass, and has necessary imaging light non-vignetted.SOLUTION: In a camera housing in which a camera is housed and a window part is formed that makes imaging light incident upon a front end part facing an imaging lens of the camera, inside the camera housing, guide means is provided that allows an imaging lens and camera to freely move in an imaging optical axis direction. The camera housing has a structure capable of extending and contracting in the imaging optical axis direction, and is configured to extend and contract in accordance with an entire length of the imaging lens and camera to be housed in the camera housing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a camera housing that houses a television camera, and more particularly to a camera housing that can smoothly perform a tilting operation when a front end portion of a photographing lens moves in a photographing optical axis direction.

  A television camera used outdoors is housed and protected in a camera housing disclosed in Patent Document 1, and takes an image through a window glass provided on the front surface of the camera housing. Also, such a camera housing is usually mounted on a remote-controlled pan head device. When the operator remotely operates the pan head device, the camera housing is moved in the pan direction and the tilt direction, and the photographing position is changed. If an optical accessory such as a wide converter or a teleconverter is used for the photographing lens in the camera housing, the mass balance of the camera housing is lost.

  In such a state, the tilting operation cannot be performed smoothly. Further, if the balance is out of balance and it is attempted to rotate by the tilt motor of the camera housing pan / tilt head device, the center of gravity has moved, and a large capacity tilt motor must be used. Therefore, since the pan head apparatus becomes expensive and power consumption increases, a balance member for canceling the movement of the center of gravity is provided. Patent Document 1 discloses an example in which the movement of the center of gravity due to the mounting of the optical accessory is canceled by a balance member and the tilt is operated smoothly.

JP 2009-36974 A

  In the prior art disclosed in the above-mentioned patent document, the balance member cancels the movement of the center of gravity when an optical accessory such as a wide converter or a teleconverter is attached to the photographing lens. However, no consideration is given to the case where the optical member changes in the direction of the photographic optical axis by an operation such as zooming or focusing after the optical member including the photographic lens and the optical accessory is incorporated in the housing.

  Therefore, when a photographic lens whose optical total length varies depending on the focal length of the zoom is incorporated in the camera housing, the front end portion of the photographic lens interferes with the front glass of the camera housing due to the zoom operation. Also, in order to prevent interference with the front glass of the camera housing, it is necessary to enlarge the front glass of the camera housing so that the required shooting light does not vignett according to the maximum optical total length of the shooting lens during zoom operation. , The camera housing becomes large.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small camera housing that does not interfere with the front glass when a photographic lens whose optical total length changes according to zoom or focus is mounted on the camera housing and that does not vignett the necessary photographic light. is there.

In order to achieve the above object, the present invention provides a camera housing in which a camera is housed and a window portion for allowing photographing light to enter the photographing lens is formed at a front end portion facing the photographing lens of the camera.
Inside the camera housing is provided guide means for allowing the photographing lens and camera to freely move in the direction of the photographing optical axis,
The camera housing has a structure that can be expanded and contracted in the direction of the photographic optical axis, and extends and contracts according to the optical total length of the photographic lens mounted on the camera housing.

  According to the present invention, it is possible to provide a small camera housing that does not interfere with the front glass when a photographic lens whose optical total length is changed by zooming or focusing is mounted on the camera housing, and in which necessary photographic light is not vignetted.

External perspective view in which camera housing according to embodiment is mounted on pan head device Schematic diagram of camera housing internal structure in Embodiment 1 Schematic diagram of camera housing internal structure in Embodiment 2 Flowchart at the time of zoom control of CPU of camera housing in embodiment 2 Schematic diagram of camera housing internal structure in Embodiment 3 Flowchart at the time of zoom control of CPU of camera housing in embodiment 3

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 shows a camera housing according to the embodiment of the present invention.

[Example 1]
FIG. 1 is an external perspective view of the pan head device 3. The pan head device 3 is roughly composed of a camera housing 1 and a pan head main body 2. The camera housing 1 is a housing for protecting the camera and lens housed therein from rain and dust. A front glass 6 is provided on the front surface of the camera housing 1 and the camera and lens mounted inside the camera housing 1 are front glass 6. Shoot through. Further, the side surface is supported by the tilt shaft 5 from the camera platform body 2 of the camera platform device 3. The tilt shaft 5 is rotated about the tilt axis by a tilt drive unit (not shown) built in the camera platform body 2.

  The pan head main body 2 is supported by a pan shaft 4, and the pan head main body 2 is rotated around the pan shaft by a pan driving unit (not shown) built in the pan head main body 2.

  The pan head device 3 is connected to the pan head controller 7 via a dedicated line or a public line. When the operator remotely operates the pan head controller 7, the pan and tilt driving unit is driven to change the photographing direction of the camera housing 1.

  FIG. 2 is a schematic diagram of the internal structure of the camera housing 1. The operation in the camera housing according to the first embodiment of the present invention will be described below with reference to FIG.

  The camera housing 1 is roughly divided into two bodies, and is composed of a housing front part 11 and a housing rear part 12 in which a front glass 6 is formed, and a joint part between the housing front part 11 and the housing rear part 12 expands and contracts. The total length of the camera housing 1 can be changed. A camera 16 having a photographic lens 15 is attached to the camera fixing base 13 inside the camera housing 1.

  The camera fixing base 13 has mounting portions 18 and 18 a for fixing to the camera housing 1. The mounting portion 18 is laid along the bottom of the housing front portion 11, and the other mounting portion 18 a is laid along the bottom of the housing rear portion 12. The guide members (guide rails) 14 and 14a are freely slid back and forth in the photographic optical axis direction. Further, the camera housing 1 includes a CPU 17, and a zoom head, a focus, and an aperture are electrically driven (a driving mechanism is not shown) through a pan head main body 2 from a remotely located pan head controller 7. The camera 16 can be set.

  The photographing lens 15 is fixed via a spacer so that the front end thereof is in contact with the front glass 6 or at a certain interval. The size of the front glass 6 is set to such a size that photographic light necessary for the wide-angle end of the photographic lens 15 is not vignetted at the fixed position.

  When a type in which the optical total length is changed in the direction of the optical axis of the photographic lens 15 by zooming is used for the photographic lens 15, the optical total length of the photographic lens 15 is changed by a zoom driving mechanism (not shown). When the mounting portion 18a is fixed so that it cannot slide freely on the guide member 14a, the front end portion of the photographic lens 15 is fixed. Therefore, when the amount of change in the optical total length at that time is 1, the mounting portion 18a. Slides on the guide member 14 by the change amount l, and the joint between the housing front portion 11 and the housing rear portion 12 expands and contracts by the change amount l.

  The zoom operation is given as an example in which the optical total length of the photographic lens 15 changes, but the same operation is performed when the optical total length changes when the focus operation is performed.

  As described above, even when a photographic lens whose optical total length changes according to zoom or focus is mounted on the camera housing, it can be a small camera housing structure that does not interfere with the front glass and does not vignett the required photographic light. Become.

  Further, the mounting portion 18a can also freely slide on the guide member 14a, and the camera fixing base 13 is guided to the center of gravity A of the camera housing 1 with respect to the tilt axis of the pan head main body 2. By sliding on the members 14 and 14a, the load applied to the tilt drive unit when the tilt shaft of the pan head main body unit is rotated can be minimized.

[Example 2]
Hereinafter, the operation in the camera housing according to the second embodiment of the present invention will be described with reference to FIG.

  Unlike the first embodiment, the entire length of the camera housing 1 is fixed, and a front glass 6 is attached to the front portion thereof. Inside the camera housing 1, a camera 16 having a photographic lens 15 is attached to a camera fixing base 13, and the camera fixing base 13 is attached to a linear motion device 20 that moves back and forth in the direction of the photographic optical axis of the camera housing 1. Yes. In addition, a CPU 17 is configured in the camera housing 1, and the movement control for the zoom, focus, and diaphragm electric drive unit of the photographic lens 15 is performed via the pan head main unit 2 from the pan head controller 7 disposed remotely. In addition, it is possible to acquire the state of other lenses such as zoom, focus, and aperture.

  Further, the CPU 17 is connected to the camera 16 so that settings such as gain, shutter, and digital zoom and status acquisition can be performed. The CPU 17 is connected to a linear motion device drive unit 21 that controls the linear motion device 20, and can drive the linear motion device 20 to move the camera fixing base 13 in the front-rear direction.

  Hereinafter, the operation of the processing during zoom control of the CPU 17 will be described with reference to the flowchart of FIG.

  A description will be given as an example when the photographing lens 15 mounted on the camera housing 1 is mounted with a type in which the optical total length changes in the direction of the photographing optical axis by zooming. Information (identification ID and model name) of the photographic lens 15 to be mounted is set in the CPU 17 in advance. In S <b> 101, when a zoom control command is received from the camera platform body 2, focal length information corresponding to the zoom control command is acquired from the photographing lens 15.

  Next, in S102, the optical total length information of the photographing lens 15 stored in advance in the nonvolatile area in the CPU 17 corresponding to the focal length acquired in S101 is read. Next, in S103, the change amount of the optical total length is obtained from the optical total length information of the photographing lens 15 read out in S102, the corresponding drive amount of the linear motion device 20 is calculated, and the drive amount is output to the linear motion device drive unit 21. In S104, zoom control is performed on the photographing lens 15 based on the zoom command control of the camera platform body 2. The linear motion device drive unit 21 controls the linear motion device 20 to move the camera fixing base 13 back and forth, so that the distance between the photographing lens 15 and the front glass 6 becomes constant.

  In the above description, the optical total length information is a non-volatile area in the CPU 17, but may be outside the CPU 17. The zoom operation is given as an example in which the optical total length of the photographic lens 15 changes. However, the same applies to the case where the optical total length changes when the focus operation is performed.

  In addition, instead of setting photographic lens information in the CPU 17 in advance, the mounted photographic lens 15 is identified by communication with the photographic lens 15, the optical total length information corresponding to the photographic lens 15 is acquired, and the drive amount is set. It may be calculated. Further, the optical total length information of the photographic lens 15 is not stored in the nonvolatile area of the CPU 17, but the optical total length information is acquired from the photographic lens 15, and the driving amount of the camera fixing base 13 is calculated based on the information. Also good.

  At this time, by setting the camera fixing base 13 in advance at the optical end of the photographing lens 15 at a position where the necessary photographing light is not vignetted by the front glass 6, the photographing lens whose optical total length changes by zooming or focusing is provided in the camera housing. Even when mounted on the camera, it is possible to achieve a configuration that does not interfere with the front glass and that does not vignett necessary photographing light.

[Example 3]
Hereinafter, the operation in the camera housing according to the third embodiment of the present invention will be described with reference to FIG. The difference from the third embodiment is that a balance adjusting mechanism is provided. Since the parts not related to the balance adjustment mechanism are the same as those in the second embodiment, the description thereof is omitted.
A balance adjustment mechanism drive unit 30 is connected to the CPU 17 and drives a balance adjustment mechanism 31 that adjusts the position of the center of gravity of the camera housing 1.

  A combination of the photographing lens 15 and the camera 16 is set in the CPU 17 in advance, and a balance adjustment that corrects the position of the center of gravity with respect to the position of the camera fixing base 13 that is uniquely determined by the combination of the photographing lens 15 and the camera. Adjustment amount data of the mechanism 31 is tabulated and stored in a non-volatile area of the CPU 17.

  Hereinafter, with reference to the flowchart of FIG. 6, the operation of the CPU 17 in the camera housing during zoom control according to the third embodiment of the present invention will be described.

  Since the operation of S101 to S102 is the same as that of the second embodiment, the description thereof is omitted. Next, in S203, whether or not the necessary vignetting of the photographing light is generated by the front glass 6 at the current position of the camera fixing base 13 based on the focal length information obtained in S101 and the total length information of the photographing lens 15 obtained in S102. Check. Next, in S204, it is confirmed whether or not it interferes with the front glass from the total length information of the photographing lens 15 acquired in S102 at the current position of the camera fixing base 13. If there is no interference in S104, the zoom of the taking lens 15 is controlled.

  If it is determined in S203 that vignetting occurs or interference occurs in S204, the position of the camera fixing base 3 where no vignetting occurs in the front glass 6 and no interference is obtained in S205, and the linear motion device 20 Is calculated and output to the linear motion device drive unit 21. In S <b> 206, the adjustment amount of the balance adjustment mechanism 31 is calculated from the data table stored in the nonvolatile area in the CPU 17 from the position of the camera fixing base 3 calculated in S <b> 205 and output to the balance adjustment mechanism drive unit 30.

  In S <b> 104, the zoom of the taking lens 15 is controlled based on a command from the pan head controller 7. The zoom operation is given as an example in which the optical total length of the photographic lens 15 changes. However, the same applies to the case where the optical total length changes when the focus operation is performed. Further, instead of setting and using photographing lens information in the CPU 17 in advance, the mounted photographing lens 15 is identified by communication with the photographing lens 15, and the optical full length information corresponding to the photographing lens 15 is acquired and driven. The amount may be calculated. Further, the optical total length information of the photographic lens 15 is not stored in the nonvolatile area of the CPU 17, but the optical total length information is acquired from the photographic lens 15, and the driving amount of the camera fixing base 13 and the balance adjustment mechanism 31 are based on the information. The adjustment amount may be calculated.

  Even when the optical total length of the photographic lens 15 does not change during the focus operation, if the field of view changes due to the focus operation, the change may be controlled in advance by the prospective front glass 6 so that no vignetting occurs. good.

  As described above, when a photographic lens whose optical total length is changed by zooming or focusing is mounted on the camera housing, it is possible to have a configuration that does not interfere with the front glass and does not cause necessary photographic light vignetting. Further, since the movement of the camera fixing base can be minimized, the power consumption for driving the camera fixing base can be reduced.

  Further, by operating the balance adjusting mechanism 31 back and forth so as to cancel the finger movement at the center of gravity A of the camera housing 1 according to the movement amount of the camera fixing base 3, the tilt axis of the pan head main body is rotated. It is possible to minimize the load applied to the tilt driving unit. As a result, a small-capacity tilt drive unit can be applied and power consumption can be reduced.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 1, 11, 12: Camera housing 2: Pan head main-body part 6: Front glass 15: Shooting lens 16: Camera 14, 14b: Guide member 18, 18a: Camera fixing base attaching part

Claims (8)

In the camera housing in which the camera is housed and a window part for allowing photographing light to enter the photographing lens is formed at the front end portion facing the photographing lens of the camera,
Inside the camera housing is provided guide means for allowing the photographing lens and camera to freely move in the direction of the photographing optical axis,
The camera housing has a structure that can be expanded and contracted in the direction of the photographic optical axis, and is expanded and contracted according to the total length of the photographic lens and the camera mounted on the camera housing. The camera housing is supported by a tilt axis of a pan head device, and is rotated around the tilt axis. When the total length of the shooting lens and the camera changes, the position of the shooting lens and the camera is adjusted so as to cancel the movement of the center of gravity. The camera housing and pan head device according to claim 1, wherein the camera housing and the pan / tilt head device are moved and expanded / contracted. In the camera housing in which the camera is housed and a window part for allowing photographing light to enter the photographing lens is formed at the front end portion facing the photographing lens of the camera,
Driving means capable of driving the positions of the photographing lens and the camera in the direction of the photographing optical axis and control means for controlling the driving means;
A camera housing wherein the position of the photographic lens and the camera is driven in the direction of the photographic optical axis by the driving means in accordance with the amount of change in the total length of the photographic lens in the direction of the photographic optical axis. The camera housing is provided with optical full length storage means for storing full length information of the photographing lens in the photographing optical axis direction,
4. The camera housing according to claim 3, wherein the control means drives the distance between the window portion and the front optical member of the photographing lens constant based on the full length information acquired from the optical full length storage means. . The camera housing includes communication means for communicating with the photographic lens, and optical total length storage means for storing full length information in the photographic optical axis direction for each of the one or more photographic lens models,
Identify the photographic lens from the communication means, obtain the full length information in the photographic optical axis direction of the corresponding photographic lens from the optical full length storage means,
The camera housing according to claim 3 or 4, wherein the photographing lens and the camera are driven in a photographing optical axis direction. The camera housing obtains the total length information in the direction of the photographic optical axis from the photographic lens by the communication means,
The camera housing according to claim 3, wherein the photographing lens and the camera are driven in a photographing optical axis direction. The camera housing is provided with a focal length storage means for storing focal length information of the photographing lens, and does not interfere with the window portion from the total length information in the photographing optical axis direction and the focal length information acquired from the focal length storage means. The camera housing according to any one of claims 4 to 6, wherein the photographing lens and the camera are driven in the photographing optical axis direction so as not to cause vignetting. The camera housing is provided with balance adjusting means for adjusting the front-rear balance in the photographic optical axis direction, and balance adjustment driving means for driving the balance adjusting means in the photographic optical axis direction,
The camera housing is supported on a tilt axis of a pan head device, and when the photographing lens and the camera are driven in the direction of the photographing optical axis,
8. The camera housing and pan head device according to claim 3, wherein the balance adjusting unit is controlled by the balance length driving unit at a position that cancels the movement of the center of gravity of the camera housing. 9.