JP3918124B2 - TV camera lens control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a television camera lens control device, and more particularly to a control device applied to a television camera lens configured to adjust a flange back by moving a master lens group of a lens optical system by driving a motor.
[0002]
[Prior art]
A shooting zoom lens used in a TV camera is composed of a focus lens group, a zoom lens group, and a master lens group, and the master lens group moves forward and backward along the optical axis in order to form a subject image sharply on the receiving surface. The flange back focus is adjusted (also referred to as tracking adjustment). In recent years, in the field of TV camera lenses, all-servo type (all-electric type) in which all the lens groups are moved by motor control has been proposed.
[0003]
[Problems to be solved by the invention]
However, the conventional television camera lens is provided with a dedicated controller for controlling the movement of each lens group. That is, a focus controller (focus position demand) for controlling movement of the focus lens group, a zoom controller (zoom rate demand) for controlling movement of the zoom lens group, and further for controlling movement of the master lens group A master lens controller was provided separately.
[0004]
The master lens group may be moved not only when adjusting the flange back, but also during shooting to obtain a special effect of blurring the image with a natural feeling, and the cameraman must operate the above controllers as appropriate. The camera operation was complicated.
The present invention has been made in view of such circumstances, and a television that can improve the operability of the camera by omitting a dedicated controller for controlling the movement of the master lens group in an all-servo type television camera lens. An object of the present invention is to provide a drive control device for a camera lens.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a control device for a lens for a television camera that includes a focus lens group, a zoom lens group, and a master lens group, and each lens group is configured to be movable by motor driving. A focus controller that outputs a lens movement command signal according to the operation of the focus operation member, a zoom controller that outputs a zoom command signal according to the operation of the zoom operation member, and an ON operation when adjusting the position of the master lens group Switch means for detecting the zoom position, and a control section for controlling the driving of each lens group based on command signals received from the focus controller and the zoom controller, from the tele end to the wide end. The total movable range of the zoom lens group is a predetermined zoom position. Are 2 minutes and the telephoto side regions and the wide side region as a reference, the switching means is turned ON, if the zoom position detected by said detecting means belongs to the range of the preset wide side region the focus using lens movement command signal output from the controller as a movement command of the master lens group, while driving and controlling the master lens group in accordance with the lens movement command signal, setting the zoom position detected by said detecting means said pre If the lens belongs to the range of the tele-side area, the lens movement command signal output from the focus controller is used as a movement command for the focus lens group, and the focus lens group is driven and controlled according to the lens movement command signal. And a controller for switching the function of the focus controller. That.
[0006]
The present invention shares the focus controller as a controller for controlling the master lens group. By turning on the switch means, the control unit changes the function of the focus controller from the control function of the focus lens group to the control function of the master lens group. It can be switched.
In particular, the present invention can provide a blurring effect to the image by adjusting the position of the focus lens group on the tele side where the depth of focus is shallow, while adjusting the position of the focus lens group on the wide side where the depth of focus is deep. However, it is not possible to give a blur effect to the image, and it has been made in consideration of a special technique of giving a blur effect to the image by adjusting the position of the master lens group. When the zoom is in the wide area, focus The movement of the master lens group can be controlled by the controller, and when the zoom is set to the tele side, the normal focus lens control function is restored.
[0007]
Thereby, a dedicated controller for adjusting the position of the master lens group can be omitted, and the operability of the camera can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a TV camera lens drive control apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.
The TV camera lens 10 includes a focus lens group 12, a zoom lens group 14, and a master lens group 16, and driving circuits 18, 20, 22 and motors 24, 26 for driving the lens groups 12-16, respectively. , 28 are provided. In the figure, each of the lens groups 12 to 16 is shown as a single lens for the sake of convenience, but is actually composed of one or a plurality of lenses.
[0009]
Further, in this television camera lens 10, the position detection means 30, 32, 34 for detecting the positions of the lens groups 12-16, and the detection signals obtained by the position detection means 30-36 are converted into digital signals. An A / D converter 38 and a central processing unit (CPU) 40 that controls driving of the lens groups 12 to 16 are provided.
The drive circuits 18 to 20 are controlled by the CPU 40 and drive the motors 24 to 28 in accordance with a control signal applied from the CPU 40. The rotational driving forces of the motors 24 to 28 are transmitted to the lens groups 12 to 16 through power transmission means (not shown), so that the lens groups 12 to 16 move back and forth along the optical axis.
[0010]
For example, potentiometers are used for the position detection means 30 to 34, and the detection signal is notified to the CPU 40 via the A / D converter 38.
As means for operating and controlling the TV camera lens 10, a zoom controller 42, a focus controller 44, and a remote tracking switch 46 (corresponding to switch means) are provided, and signals output from the controllers 42, 44, A signal indicating the ON / OFF state of the remote tracking switch 46 is input to the CPU 40.
[0011]
The zoom controller 42 is a zoom rate demand having, for example, a rotation operation member called a thumb ring (corresponding to a zoom operation member), and is in a tele direction or wide according to the rotation direction and the rotation amount of the thumb ring from the neutral position. A signal (zoom speed command signal) for commanding the zoom speed in the (Wide) direction is output. Although not shown in the drawing, this zoom controller is attached to the vicinity of the grip of the pan bar provided on the pan head supporting the television camera so that the cameraman can operate it at hand.
[0012]
The focus controller 44 is a means for controlling the focus lens group 12 and is also used as a means for controlling the master lens group 16. That is, it is normally used as a controller for controlling the focus, but can be used as a controller for controlling the flange back focus (F.f) when the remote tracking switch is pressed (turned on).
[0013]
The focus controller 44 is, for example, a signal (focus position command signal or flange back focus position command signal) that commands the position of the lens group 14 or 16 according to the rotation direction and rotation amount of a rotation operation member (corresponding to a focus operation member). Is output. Although not shown in the drawing, this focus controller is also attached to a pan head supporting the television camera via an appropriate attachment means so that the cameraman can operate it by hand.
[0014]
The zoom controller 42 and the focus controller 44 can have various forms, and the specific forms are not limited to those described above. For example, a zoom controller for instructing a zoom tele direction or a wide direction by a button operation, and a control device having both a zoom control function and a focus control function are also included.
In addition to the zoom controller 42 and the focus controller 44, the TV camera lens 10 may include various controllers (such as a shot box that instantly reproduces a focus position and a zoom position stored in advance by a button operation). Controller).
[0015]
The remote tracking switch 46 is a changeover switch for turning on / off the driving of the master lens group 16 and is normally in an OFF state, and is turned on when the master lens group 16 is moved. The remote tracking switch 46 is preferably provided on a controller at hand such as the zoom controller 42.
[0016]
Next, the operation of the TV camera lens control apparatus configured as described above will be described.
As shown in the flowchart of FIG. 2, when the process of the CPU 40 is started, first, various initial settings are executed (step S210). Then, the state of the remote tracking switch 46 is confirmed (step S212). Since the remote tracking switch 46 is normally in the OFF state as described above, if the remote tracking switch 46 is not pressed, the CPU 40 sets the focus controller 44 so that it can be used as a focus control controller which is the original function. (Step S214). In this case, when a rotation operation member (focus operation member) is operated, the focus lens group 12 is moved in accordance with the operation, and focus adjustment is performed.
[0017]
When the remote tracking switch 46 is pressed in step S212, the CPU 40 reads the zoom position detected by the position detection means 32 via the A / D converter 38 (step S216).
The total movable range of the zoom lens group 14 from the tele end to the wide end is divided into a tele side area and a wide side area with a predetermined zoom position as a reference, and the current zoom read in step S216. It is determined whether or not the position belongs to the tele side area (step S218). Note that the reference zoom position may be determined as the wide end, and when the zoom position coincides with the wide end, it may be determined to belong to the wide side region, and otherwise, it may be determined to belong to the tele side region.
[0018]
When the zoom is in the tele side area, the focus controller 44 can be used as a controller for focus control (step S220). In this case, when the focus operation member is operated, the focus lens group 12 is moved according to the operation.
If the current zoom position does not belong to the tele side area in step S218, it is then determined whether or not the current zoom position belongs to the wide side area (step S222). When the zoom is in the wide side area, the CPU 40 switches the function of the controller so that the focus controller 44 can be used as a controller of the master lens group 16 (a controller for flange back focus control) (step S224). Therefore, in this case, when the focus operation member is operated, the master lens group 16 is moved according to the operation, and the flange back focus can be adjusted. In particular, it is effective to use the blurring effect on the video being shot in the wide-side area where the depth of focus is deep.
[0019]
Note that the position of the master lens group 16 set by performing flange back adjustment before the start of photographing can be stored by a storage means (not shown), and the remote tracking switch 46 is turned off after the above blurring operation is finished. When the zoom is moved to the tele side and the function of the focus controller 44 is returned to the original focus control function, the position information is read from the storage means to return the master lens group 16 to the original position. it can.
[0020]
Next, a modification of the embodiment of the present invention will be described.
The zoom controller 42 is provided with a tele / wide selection switch (not shown). When the tele (T) switch is pressed, the zoom moves toward the tele end, and when the wide (W) switch is pressed, the zoom moves toward the wide end. It is configured to move.
When the remote tracking switch 46 is turned on and the wide switch of the selection switch is pressed, the zoom is moved to the wide end and the focus controller 44 is moved to the F.F. It is switched to the f control function. On the other hand, when the tele switch of the selection switch is pressed, the zoom is moved to the tele end and the focus controller 44 is set to the original focus control function.
[0021]
【The invention's effect】
As described above, according to the TV camera lens control device of the present invention, the focus controller for commanding the movement of the focus lens group is shared as the controller for commanding the movement of the master lens group, and the function of the focus controller Since the switch means for switching is provided and the position of the master lens group can be adjusted by the focus controller in the wide side region where the depth of focus is deep, a dedicated controller for adjusting the position of the master lens group is omitted. be able to. In particular, if the present invention is used, a special operation for giving a blurring effect to an image can be easily performed by a controller at hand.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration of a TV camera lens control device according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a processing flow of a CPU according to the present embodiment.
DESCRIPTION OF SYMBOLS 10 ... TV camera lens 12 ... Focus lens group 14 ... Zoom lens group 16 ... Master lens group 24, 26, 28 ... Motor 18, 20, 22 ... Drive circuit 30, 32, 34 ... Position detection means 40 ... CPU (control) Equivalent to part)
42 ... Zoom controller 44 ... Focus controller 46 ... Remote tracking switch (corresponding to switch means)

Claims (2)

In a control device for a TV camera lens having a focus lens group, a zoom lens group, and a master lens group, each lens group being configured to be movable by motor drive.
A focus controller that outputs a lens movement command signal according to the operation of the focus operation member; a zoom controller that outputs a zoom command signal according to the operation of the zoom operation member;
Switch means that is turned on when adjusting the position of the master lens group, detection means for detecting the zoom position,
A control unit that controls driving of each lens group based on command signals received from the focus controller and the zoom controller, and the total movable range of the zoom lens group from the tele end to the wide end is determined in advance. predetermined zoom position has been divided into two and the telephoto side regions and the wide side region as a reference, the switching means is turned oN, the zoom position detected by said detecting means belongs to the range of the preset wide side region In this case, the lens movement command signal output from the focus controller is used as a movement command for the master lens group, and the master lens group is driven and controlled according to the lens movement command signal, while the zoom position detected by the detection means If it is within the scope of the preset telephoto side regions outputted from said focus controller Using lens movement command signal as a movement command of the focus lens group, and a control unit for switching the function of the focus controller to drive control the focus lens group in accordance with the lens movement command signal,
A control device for a TV camera lens, comprising: The zoom controller has a tele / wide selection switch as a zoom operation member, and outputs a zoom command signal for moving the zoom in a wide direction when the wide switch of the selection switch is selected, while the tele switch of the selection switch When is selected, the zoom command signal for moving the zoom in the tele direction is output.
The control unit moves the zoom lens group to a wide end when the switch unit is turned on and the wide switch is pressed, and sets the focus controller as a function for controlling the master lens group, while the teleswitch 2. The TV camera lens control device according to claim 1, wherein when the is pressed, the zoom lens group is moved to a telephoto end and the focus controller is set to a function for controlling the focus lens group.

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