JPH1078609A - Lens controlling device for television camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To call operator's attention by displaying that the focusing position of a lens and a commanded position by a focusing operation means are deviated at such a time in the case of reproducing the previously stored focusing lens position by switching operation and to make the lens smoothly begin to move at the time of shifting to focusing control by the focusing operation means. SOLUTION: In the case the actual focusing position of the lens device differs from the commanded position by the focusing knob 14 of a shot box 10 after executing shot operation by a shot switch 22A, a direction designating mark 38 showing a direction in which the knob 14 should be moved is lit by a light emitting means such as a light emitting diode(LED) in order to align both positions. Then, a signal line is switched so that a command by the knob 14 is made ineffective in the case the actual focusing position differs from the commanded position of the knob 14, and it is made effective in the case both of them are aligned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens control device for a television camera, and more particularly to a lens control device for a television camera such as a shot box with a focus knob used for a broadcast television camera.

[0002]

2. Description of the Related Art A broadcast television camera is sometimes provided with a lens control device called a shot box. The shot box is a device in which zoom and focus positions and the like are stored in advance for each specific cut (shot) and instantaneously reproduced by a switch operation. There is also known a shot box in which a focus knob is provided, and the focus can be manually adjusted by operating the focus knob in a manual mode.

Some shot boxes with a focus knob switch to a manual mode by pressing a shot release button, and others switch to a manual mode immediately when the focus knob is moved.

[0004]

However, in the conventional shot box, the focus position of the lens after executing the shot operation by the switch operation is different from the position indicated by the focus knob of the shot box (focus command position). If the mode is switched to the manual mode in this state, there is a problem that the focus suddenly starts moving and the image changes unnaturally.

To solve such a problem, it is conceivable to use a rotary encoder instead of a conventional potentiometer as the position detecting means of the focus knob of the shot box, and control the microcomputer with the rotary encoder. That is, when the focus knob of the shot box is operated after the shot is executed, the lens focus is moved according to the operation amount of the focus knob based on the focus position of the lens after the shot, so that the focus can be smoothly moved. It is also possible to realize.

However, in such microcomputer control, since the focus knob of the shot box must have an endless structure, there is no infinity (∞) end end or the closest (MOD) end end of the focus knob. In addition, there arises a problem that it is difficult for a photographer to focus on infinity, near infinity, MOD, or near MOD. In addition, there is a problem that focusing using the scale of the case ring cannot be performed.

The present invention has been made in view of such circumstances, and displays that a focus position of a lens after a shot is executed and a focus command position by a focus knob provided in a lens control device are displaced. This alerts the operator and allows the lens to start moving smoothly from shot to manual,
For the operator, the infinite (端) end end and the closest (MO
It is an object of the present invention to provide a lens control device for a television camera that can easily grasp the end end of D) and does not cause a sense of discomfort.

[0008]

In order to achieve the above object, the present invention provides a lens control device for a television camera which reproduces at least one focus lens position stored in advance by operating a switch. Focus operation means for instructing the position of the focus lens according to the operation, comparing the focus position indicating the position of the focus lens after a switch operation and the focus command position by the focus operation means,
Comparing means for detecting a difference between the focus command position and the focus position, and display means for displaying a direction of the difference between the focus command position and the focus position based on a detection result of the comparing means. It is characterized by:

According to the present invention, after executing a shot operation for reproducing a previously stored focus lens position (focus position) by operating a switch such as a shot switch, the actual focus position of the lens device and the actual focus position are determined. A focus command position of a focus operation unit provided in a lens control device for a television camera is compared, and a difference between the focus command position and the focus command position is detected. Then, based on the detection result, it is determined whether the focus command position is shifted to the infinity side or the closest side with respect to the focus position, and a display regarding the shifted direction is performed. Thereby, there is an advantage that the operator who operates the focus operation unit can be alerted.

In particular, by displaying the direction in which the focus operation member should be operated to match the actual focus position with the command position of the focus operation means, after the shot operation, the focus position of the lens and the command of the focus operation means are displayed. The positional deviation can be easily determined. According to another aspect of the present invention, after executing the shot operation,
When the focus position is different from the focus command position, the focus control by the focus operation unit is invalidated, and when the focus position matches the focus command position, the focus control by the focus operation unit is enabled. By doing so, there is an advantage that the switching from the shot operation to the manual operation becomes smooth, and the change in focus becomes smooth. Furthermore, there is no need for the focus operation member to have an endless structure, and since an infinite end end or a close end end is determined, it is easy to focus near infinity or the closest, and there is an advantage that there is no unnatural feeling in operation. is there.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens control device for a television camera according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows an example in which a television camera lens control device according to the present invention is applied to a shot box of a broadcast television camera.
A full servo operation type lens device 6 is connected to the television camera 4 supported by the camera platform 2.

The camera platform 2 is provided with two operation rods 2A and 2B, and the operation rod 2A on the right hand side of the photographer is provided.
A shot box 10 is attached via a fixed knob 12 in the vicinity of the grip. The shot box 10 stores zoom and focus positions in advance for each specific cut (shot), and reproduces them instantaneously by operating a switch.

The shot box 10 is provided with a focus knob 14 for manually operating a focus. A position control signal for instructing a movement position of the focus lens group in the lens device 6 is output according to the amount of rotation operation of the focus knob 14, and the focus lens group is driven based on the position control signal. A potentiometer for detecting the position of the focus lens group is provided in the lens device 6, and the focus position can be grasped by the potentiometer.

On the other hand, near the grip of the operating rod 2B, there is a zoom rate demand 1 for operating the zoom speed.
6 is attached. Zoom rate demand 16
Outputs a speed control signal for performing a zoom operation to the wide angle side or the telephoto side according to the rotation direction and the rotation amount of the zoom ring 16A. Based on this speed control signal, the variable power lens group in the lens barrel of the lens device 6 is speed-controlled and driven.

The cameraman adjusts the focus by operating the focus knob 14 with the right hand while looking at the captured image reflected on the viewfinder 18 and operates the zoom ring 16A of the zoom rate demand 16 with the left hand. It can be carried out. Although not shown in detail in FIG. 1, a drum holding an extender lens is rotatably mounted on the lens device 6. The extender drum is rotationally driven by a motor (extender motor) that operates according to the operation of an extender switching knob provided on the mount frame side or the operation of a switch provided on the shot box 10, and is provided with an optical axis. Or retracts from the optical axis.

Further, an iris mechanism (not shown) is provided in the lens barrel of the lens device 6, and the aperture value can be changed by the driving force of the iris motor. Next, the configuration of the shot box will be described. FIG. 2 is a front view showing an example of the appearance of the shot box 10, and FIG. 3 is a right side view. As shown in FIG. 2, the shot box 10 includes shot buttons (shot switches) 22A, 22B,..., 22F for setting and reproducing six cuts from the first to the sixth. Position setting knobs 23A, 23B,..., 23 for setting zoom and focus positions for each shot button
F is provided. Each position setting knob 23A, 2
3B,..., 23F are double-barreled, and the inner knob 2
4F, the zoom position can be set, and the outer knobs 25A, 25B,..., 25F can set the focus position.

In FIG. 2, reference numeral 26 denotes a speed adjustment knob, which can adjust the zoom speed with the inner knob 26A and the focus speed with the outer knob 26B. Reference numeral 28 denotes a multi-function switch, and the function of this switch is changed according to the position of the mode selection switch 30 shown in FIG.
The mode selection switch 30 is provided for the F & Z mode and the Z & Z (×
2) The mode and the Z & Z mode can be switched to three stages, and the type of the selected mode is the mode indicator 3
2 is displayed.

A rotary focus knob 14 is provided on a side surface of the shot box 10. The focus knob 14 is provided with a potentiometer (not shown), and outputs a position command signal corresponding to the amount of rotation of the focus knob 14. The focus knob 14 reaches from the end end at infinity to the nearest end end in two rotations, and is provided with a scale ring 34 as a guide for grasping the rotational position of the focus knob 14. (See FIG. 2).

At the base end of the focus knob 14,
A display unit 36 is provided to indicate the difference between the actual focus position of the lens device 6 and the command position of the focus knob 14. When the actual focus position and the position of the focus knob 14 are misaligned, the display unit 36 indicates the direction in which the focus knob 14 should be moved in order to make the two coincide with each other. The instruction marks 38, 38 are turned on by light emitting means such as a light emitting diode (LED).

Incidentally, as shown in FIG.
A torque adjusting screw 40 is provided at the center of 4 so that the rotational torque of the focus knob 14 can be adjusted. Further, in the figure, reference numeral 42 denotes a focus reverse switch, reference numeral 44 denotes a connector for connection to the zoom rate demand 16, and reference numeral 46 denotes a connector for connection to the lens device 6.

FIG. 4 is an electric circuit diagram showing a main configuration of the shot box 10. Focus potentiometer 5 for detecting the focus position of lens device 6
2 is split into two, one of which is the first comparator 5
4 is connected to the second input terminal of the second comparator 56.
To the plus input terminal. The output of the potentiometer 58 of the focus knob 14 of the shot box 10 is also branched into two, one of which is guided to the plus input terminal of the first comparator 54 and the other to the minus input terminal of the second comparator 56.

The first comparator 54 outputs a high-level (H) signal when the plus input is equal to or more than the minus input, and outputs a low-level (L) signal when the plus input is less than the minus input. It has become. First
The output terminal of the comparator 54 has a light emitting diode (LE
D) The negative terminal of the first comparator 54 is connected.
When the output of the first comparator 54 is at a high level, the LED 60 is turned on.
D60 is turned off.

Similarly, the second comparator 56
When the plus input is more than the minus input, a high-level (H) signal is output, and when the plus input is less than the minus input, a low-level (L) signal is output. The output terminal of the second comparator 56 is connected to the negative terminal of a light emitting diode (LED) 62. When the output of the second comparator 56 is at a low level, the LED 62 is turned on, and when the output of the second comparator 56 is at a high level. The LED 62 is turned off. The LEDs 60 and 62 are respectively connected to the display unit 3 shown in FIG.
6 are provided at the direction indication marks 38, 38.

The first and second comparators 54, 56
Are guided to input pins of an AND gate 64, respectively. While the output of the AND gate 64 is at the low level, the contact piece 66A of the changeover switch 66 is in contact with the contact 67 of the shot signal line, and the shot signal based on the shot switch 22 is sent to the outside (the lens device 6 side) as a lens control signal. Is output. During this time, the focus knob 14
Is operated, the focus of the lens device 6 does not move.

When the output of the AND gate 64 is at a high level, that is, the output of the focus potentiometer 52 of the lens device 6 and the focus knob 1 of the shot box 10
When the output of the potentiometer 58 matches the contact of the changeover switch 66, the contact piece 66A comes into contact with the contact 68 of the manual signal line. This allows
A manual signal based on the operation of the focus knob 14 is output to the lens device 6 as a lens control signal.

The operation of the shot box configured as described above will be described. First, from No. 1 to 6 shown in FIG.
, The corresponding position setting knobs 23A, 23B,... Are operated for each of the shot switches 22A, 22B,. Note that not all shot switches need be used.

For example, when the shot switch 22A is operated during shooting, the stored focus and zoom positions are reproduced. Although the focus position is always detected by the potentiometer 52, when this shot operation is executed, the command by the focus knob 14 of the shot box 10 is invalidated, so that the actual focus position and the potentiometer 5 of the focus knob 14 are set.
There is a difference from the position indicated by 8.

For example, when the position of the focus knob 14 of the shot box 10 deviates from the actual focus position to infinity, the output of the focus potentiometer 52 of the lens device 6 shown in FIG. The output of the potentiometer 58 of the knob 14 increases. In this case, the output of the first comparator 54 is high, the output of the second comparator 56 is low, the LED 60 is turned off, and the LED 62 is turned on. This lit LED6
The direction indicated by the triangular direction indication mark 38 indicated by 2 is the direction in which the focus knob 14 should be moved in order to match the actual focus position with the position of the focus knob. In this case, the direction in which the focus is moved to the closest side is displayed.

Thereafter, when the focus knob 14 is operated in the direction indicated by the direction indication mark 38 according to this display, the mode automatically shifts to the manual focus operation mode.
While the actual focus position is different from the position of the focus knob 14, even if the focus knob 14 is operated, the focus lens group does not move (the focus state does not change).

Actual focus position and focus knob 1
4, the first and second comparators 54, 54
The outputs of both 56 become high level, and the LEDs 60 and 62
Are both turned off. Both LEDs 60 and 6 of the display unit 36
By turning off the light 2, the cameraman can recognize that the actual focus position and the position of the focus knob 14 match.

At this time, the output of the AND gate 64 becomes high level, and the contact 66A of the changeover switch 66 switches to the manual signal line side. Thereafter, the manual focus command by operating the focus knob 14 becomes valid, and the focus can be adjusted according to the operation of the focus knob 14. After the shot is executed, if the position of the focus knob 14 of the shot box 10 deviates from the actual focus position to the nearest side, the same as described above except that the lit LED is different, the description is omitted.

As described above, if the actual focus position of the lens device 6 is different from the command position of the focus knob 14 of the shot box 10 after executing the shot,
Since the display unit 36 is provided to indicate the different direction, that is, whether it is shifted to the closest side or to the infinite side, the operator can be alerted. When the actual focus position of the lens device 6 and the command position of the focus knob 14 are different, the command by the focus knob 14 is invalidated, and the focus knob 14 is operated according to the display on the display unit 36 so that the two are operated. Since the command by the focus knob 14 is made effective when they coincide with each other, there is an advantage that the movement of the focus lens group at the time of switching from the shot operation to the manual operation becomes smooth.

Further, since the focus knob 14 does not need to have an endless structure, and the end point at infinity and the end point of MOD are determined, the operation at infinity and near infinity, or near MOD and MOD is operable. There is an advantage that focusing can be easily performed and the operator can use the camera without feeling uncomfortable. Various forms other than those described above are conceivable for the display on the display unit. For example, when the actual focus position of the lens device 6 and the command position of the focus knob 14 of the shot box 10 are approaching, the lit LED 60 or 62 is blinked to call attention to the operator. Is also good.

[0034]

As described above, according to the lens control device for a television camera according to the present invention, when the previously stored focus lens position is reproduced by operating the switch, the actual focus position of the lens device and the focus position are adjusted. When the command position of the operation means is different, a display indicating the different direction is performed.
When switching to the focus control by the focus operation unit after the switch operation, the operator can be alerted. In particular, by displaying the direction in which the focus operation member should be operated in order to match the actual focus position with the command position of the focus operation means, it is easy to determine the deviation between the focus position and the command position of the focus operation means. There is an advantage that can be.

If the actual focus position is different from the command position of the focus operation means, the command by the focus operation means is invalidated, and if the two coincide, the command by the focus operation means is made valid. Therefore, there is an advantage that the movement of the lens becomes smooth at the time of transition from the shot operation to the manual operation.

Furthermore, since the focus operation member does not need to have an endless structure, it is easy for the operator to grasp the end end at infinity (∞) and the end end at the nearest (MOD), and to be near the infinity and the nearest. There is an advantage that focusing around the area is easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example in which a lens control device for a television camera according to the present invention is applied to a shot box of a broadcast television camera.

FIG. 2 is a front view showing an example of the appearance of a shot box.

FIG. 3 is a right side view of the shot box.

FIG. 4 is an electric circuit diagram showing a main configuration of a shot box.

[Explanation of symbols]

 Reference Signs List 4 ... TV camera 6 ... Lens device 10 ... Shot box 14 ... Focus knob 22A, 22B, 22F ... Shot switch 23A, 23B, 23F ... Position setting knob 36 ... Display unit 38 ... Direction mark 52 ... Lens device focus potentiometer 54 ... First comparator 56 ... Second comparator 58 ... Focus knob potentiometers 60 and 62 ... Light emitting diode (LED) 64 ... AND gate 66 ... Switch

Claims (3)

[Claims] 1. A lens control device for a television camera for reproducing at least one focus lens position stored in advance by a switch operation, wherein focus operation means for commanding a position of the focus lens in accordance with an operation of a focus operation member. Comparing means for comparing a focus position indicating the position of the focus lens after a switch operation with a focus command position by the focus operation means, and detecting a difference between the focus position and the focus command position; A lens control device for a television camera, comprising: display means for displaying, based on a result, a direction of a difference between the focus position and the focus command position. 2. The display device according to claim 1, wherein the display unit is configured to indicate a direction in which the focus operation member should be operated to match the focus position with the focus command position. Lens control device for TV cameras. 3. As a result of the comparison by the comparing means, when the focus position and the focus command position are different, the focus control by the focus operating means is invalidated, and the focus operating means is operated, 2. The television camera according to claim 1, further comprising control switching means for enabling focus control by said focus operation means when said focus position and said focus command position match as a result of comparison by said comparison means. Lens control device.