JPH11271593A - Lens operating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a lens operating device such as a focus demand while it is connected to a lens device with arbitrary resolution by converting the manipulated variable of the lens operating device into a position command signal of resolution matching the resolution of the lens device and sending it to the lens device. SOLUTION: The CPU 74 of the focus demand 28 detects necessary resolution of the lens device 12 with the signal sent by the lens device 12 through a serial communication interface 82. Then the manipulated variable of a focus ring is detected by a potentiometer 72, the manipulated variable is converted into the position command signal of the necessary resolution and the position command signal is sent to the lens device 12 through the serial communication interface 82.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens operating device, and more particularly to a lens operating device for operating a zoom and a focus of a lens device used for a television camera.

[0002]

2. Description of the Related Art In a lens device used for a television camera or the like, for example, the accuracy of position control of a focus lens is expressed by a resolution. The resolution when controlling the position of the focus lens by digital processing is the total number of digital values assigned to identify each position within the entire movement range of the focus lens (when each position within the movement range is identified by 10 bits). Corresponds to 1024) or the number of divisions when the moving range is divided by a digital value. Similarly, when controlling the speed of the zoom lens, the accuracy of the speed control can be represented by resolution, where the resolution is the total number of digital values assigned to identify each speed within the controllable speed range. .

On the other hand, the accuracy of a lens operating device such as a focus demand or a zoom demand for operating a focus lens or a zoom lens of a lens device as described above is expressed by a resolution. The resolution in this case is, for example,
In the case of a focus demand, it is the total number of digital values assigned to identify each rotation position (operation amount) within the entire operation range of the focus ring to be rotated. When the operation amount of the operation member such as the focus ring is directly output to the lens device as a command signal for instructing lens movement, the resolution of the command signal is equal to the resolution of the operation amount of the operation member.

[0004] Japanese Patent Application Laid-Open No. H08-08204 discloses a device for exchanging digital signals between a lens device and a lens operation device.
No. 23469. By the way,
The required resolution of a lens device used for a broadcast television camera is much larger than that of a consumer video camera lens device. For this reason, the resolution of the lens operating device used in such a lens device is 200 to 1000 over the entire operating range.
Performance that can be divided into zeros is required, and this depends on the specifications of the lens device.

[0005]

However, the lens device and the lens operating device are not always used in the same combination, and the resolution of the lens device may be different from the resolution of the lens operating device. In such a case, there has been a problem that the lens operating device may not be able to properly operate the lens device.

In the case where a lens device and a lens operating device having different resolutions can be used in combination,
In order to make the most of the performance of the lens device, it is necessary to design the resolution of the lens operating device at least higher than the resolution of the lens device. However, if the resolution of the lens operating device is higher than necessary than the resolution of the lens device, unnecessary communication between the lens device and the lens operating device increases, and the response of the lens to the operation deteriorates. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and enables control of a lens device with a resolution suitable for the resolution of the lens device, so that the lens device can be used by being connected to a lens device having an arbitrary resolution. It is an object of the present invention to provide a lens operating device that can be used.

[0008]

According to the present invention, in order to achieve the above object, a command signal for commanding movement of a lens of a lens device is generated based on an operation amount of an operation member, and the command signal is transmitted to the lens device. A lens operating device for transmitting, a required resolution detecting means for detecting a resolution of the command signal required by the lens device; an operating amount detecting means for detecting an operating amount of the operating member at a predetermined resolution; Command signal converting means for converting the operation amount detected by the detecting means into a command signal having a resolution detected by the required resolution detecting means; transmitting means for transmitting the command signal obtained by the command signal converting means to the lens device; , Is provided.

According to the present invention, the resolution of the command signal transmitted from the lens operating device to the lens device is changed in accordance with the required resolution of the lens device. Resolution) can be used appropriately, and unnecessary communication between the lens operating devices can be reduced to improve the operability of the lens operating device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens operating device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of a television camera to which a lens operation device according to the present invention is applied. As shown in FIG. 1, the television camera 10 includes a lens device 12 and a camera body 14, and is supported by a camera platform 18 on a pedestal dolly 16. Two operation rods 22 and 23 are extended from the camera platform 18, and the grip 2 of the operation rod 22 is
Zoom demand 2 to operate zoom speed near 4
6 is attached. On the other hand, a focus demand 28 for operating a focus is attached to an end of the operation rod 23.

The zoom demand 26 is a lens operation device to which the present invention is applied. The zoom demand 26 transmits, via a cable 30, a speed command signal for performing a zoom operation to the wide-angle side or the telephoto side in accordance with the rotation direction and the rotation amount of the thumb ring 34. Lens unit 12
Send to The lens device 12 drives the variable power lens at the speed specified by the speed command signal. On the other hand, the focus demand 28 is a lens operation device to which the present invention is applied, and outputs a position command signal for moving the focus lens according to the amount of rotation of the focus ring 28A of the focus demand 28 via the cable 31 12 is output. The lens device 12 moves the focus lens to the position specified by the position command signal.

The cameraman adjusts the focus by rotating the focus ring 28A of the focus demand 28 with the right hand while looking at the captured image reflected on the bee finder 32, and adjusts the zoom demand 26 with the left hand.
The zoom adjustment is performed by operating the thumb ring 34 of.
FIG. 2 is a diagram showing a circuit configuration of the focus demand 28 which is a lens operation device according to the present invention and the lens device 12. As shown in FIG.
It comprises a chip CPU 40, a focus lens 42, a drive motor 44, an amplifier 46, and a potentiometer 48.

The focus lens 42 is driven by a drive motor 44. The drive motor 44
The drive is performed by a drive signal input from the PU 40 via the amplifier 46. The potentiometer 48 detects the position of the focus lens 42 by detecting the rotational position of the drive motor 44, and inputs the detected position to the one-chip CPU 40 as a voltage signal.

In the one-chip CPU 40, various circuits such as a ROM 52, a RAM 54, a serial communication interface 56, an A / D converter 58, and a D / A converter 60 are arranged on one chip in addition to the CPU 50. . In this embodiment, a one-chip CPU is used.
It is not necessary to configure these circuits with the chip CPU. A required control program is recorded in the ROM 52, and the CPU 50 executes the control program to control the position of the focus lens 42.
In addition, the RAM 54 temporarily records operation data of the CPU 50 as needed.

The serial communication interface 56
Performs serial communication with the focus demand 28 and receives, for example, a position command signal from the focus demand 28. In addition, the required resolution of the present lens device 12 is transmitted to the focus demand 28 as described later. The CPU 50 receives a position command signal transmitted from the focus demand 28 via the serial communication interface 56 and outputs a position signal of the focus lens 42 detected by the potentiometer 48 to the CPU 50.
The data is input via a / D converter 58.
The CPU 50 outputs a digital signal of a predetermined value based on the difference between the movement position (target position) of the focus lens 42 specified by the position command signal and the current position (control position) of the focus lens 42 input from the potentiometer 48. (Drive signal), and outputs the drive signal to the D / A converter 60. This drive signal is supplied to the D / A converter 6
After being converted to analog by 0, it is output to the drive motor 44 via the amplifier 46. Thus, the focus lens 42 moves to the target position specified by the position command signal from the focus demand 28.

On the other hand, the focus demand 28 mainly comprises a one-chip CPU 70 and a potentiometer 72. The potentiometer 72 detects an operation amount (rotational position) of a focus ring 28A (see FIG. 1) which is an operation member of the focus demand 28, and inputs the detected operation amount to the one-chip CPU 70 as a voltage signal. 1
The chip CPU 70 is a single chip C of the lens device 12.
Similarly to the PU 40, the CPU 74, the ROM 76, the RAM 7
8, various circuits such as an A / D converter 80 and a serial communication interface 82 are provided on a single chip. The ROM 76 stores a required control program to be executed by the CPU 74. Also, the RAM 78
, The operation data of the CPU 74 is temporarily recorded as necessary.

The CPU 74 has a focus ring 2
The operation amount of 8A is input from the potentiometer 72 via the A / D converter 80. CPU
74 generates a position command signal indicating a moving position (target position) of the focus lens 42 based on the operation amount of the focus ring 28A, and outputs the position command signal to the serial communication interface 82. The serial communication interface 82 controls communication with the serial communication interface 56 of the lens device 12 and transmits the position command signal to the lens device 12 side. As a result, a position command signal corresponding to the operation amount of the focus ring 28A is transmitted to the lens device 12, and the focus lens 42 moves to the target position indicated by the position command signal as described above.

Next, the processing contents of the CPU 74 in the focus demand 28 will be described in detail. The focus demand 28 performs a process of automatically matching the resolution of the position command signal transmitted to the lens device 12 with the required resolution of the lens device 12. The required resolution of the lens device 12 corresponds to the total number of digital values assigned to identify the position of the focus lens 42. For example, the CPU 50 of the lens device 12 sets the control position of the focus lens 42 input from the potentiometer 48 and the target position of the focus lens 42 indicated by the position command signal from the focus demand 28 as a 10-bit digital value. , The total number of digital values assigned to identify the position of the focus lens 42 is 0 to 1023 at the maximum.
Up to 1024. That is, the required resolution in this case is 1024.

On the other hand, one of the resolutions of the focus demand 28 is the resolution of the operation amount of the focus ring 28A, and this resolution is the total number of digital values assigned to identify the operation amount of the focus ring 28A. . For example, the CPU 74 of the focus demand 28
Converts the voltage signal input from potentiometer 72 to A
When the digital signal is input as an 11-bit digital signal by the / D converter 80, the CPU 74 recognizes the operation amount of the focus ring 28A by 2048 digital values from 0 to 2047 at the maximum. That is, the resolution in this case is 2
048.

The resolution of the focus demand 28 includes the resolution of the position command signal. This resolution corresponds to the total number of digital values assigned to represent the movement position of the focus lens 42. When the operation amount of the focus ring 28A is output as it is as a position command signal, the resolution of the position command signal and the focus ring 2
The resolution of the manipulated variable of 8A is equal.

When the CPU 74 outputs the operation amount of the focus ring 28A as a position command signal as it is, if the resolution of the operation amount of the focus ring 28A is 2048 as described above, the resolution of the position command signal is 2048. Becomes In this case, if the required resolution of the lens device 12 is 1024 as described above, the CPU 50 of the lens device 12 cannot recognize a position command signal having a digital value exceeding 1024.

Therefore, the CPU of the focus demand 28
Reference numeral 74 preliminarily receives the required resolution of the lens device 12 from the lens device 12 and performs processing for matching the resolution of the position command signal to the required resolution. FIG.
6 is a flowchart illustrating a processing procedure of No. 4; CPU7
4 first performs the following initial settings. First, the lens device 1
The required resolution D of the focus lens 42 is input from the second serial communication interface 56 via the serial communication interface 82 of the focus demand 28 (step S10).

Similarly, command data a for moving the focus lens 42 to the infinity end and command data b for moving the focus lens 42 to the closest end (MOD) are input from the lens device 12 (step S12). S14). The command data a and b indicate the value of the position command signal for moving the focus lens 42 to the infinity end or the closest end (MOD).

After completing the above initial settings, the CPU 74
Performs the following normal operation processing. First, the focus ring 28A detected by the potentiometer 72
Is input via the A / D converter 80 (step S16). Then, the operation amount x is converted into an operation amount x represented by a required resolution (described later), and an output value y to be transmitted as a position command signal is calculated by the following equation (1) (step S18).

[0025]

Y = (ba) / Dx + a (1) That is, the resolution (A) of the operation amount x of the focus ring 28A
When the resolution of the / D converter 80) is C, the CPU 74
As shown in FIG. 4, the operation amount x (0 to C-1) (horizontal axis) of the focus ring 28A is converted into the operation amount x (0 to D-1) of the required resolution D processed in the lens device 12. ) (Vertical axis). Thereby, the resolution of the operation amount x of the focus ring 28A can be made to match the required resolution of the lens device 12. Then, if the converted operation amount x is transmitted to the lens device 12 as a position command signal, the focus lens 42 of the lens device 12 can be appropriately operated.

In practice, however, the CPU 74 does not output the converted operation amount x of the focus ring 28A as a position command signal as it is, but further operates the focus ring 28A as shown in FIG. axis)
Is linearly converted into the value (vertical axis) from the command data a at the infinity end to the command data b (MOD) at the near end by the above equation (1), and this value is output as the output value y (position command Signal). Thereby, the focus ring 28
A play portion of A (a dead portion where the focus lens 42 does not move even when the focus ring 28A is rotated) is eliminated, and useless operation of the focus ring 28A is reduced.

When the output value y is calculated in this way,
The CPU 74 uses the output value y as a position command signal via the serial communication interface 82
2 (step S20). As a result, the focus lens 42 moves following the rotation operation of the focus ring 28A. Next, the CPU 74 determines whether or not there is a setting change command from the lens device 12 (step S22). If a setting change command is input from the lens device 12, the process returns to step S10, and the initial setting process is executed again. For example, in the case of a lens device that changes the position of the closest end (MOD) of the focus lens 42 by the zoom magnification, when the zoom magnification is changed by operating the zoom demand 26, a command to change the setting is sent to the focus demand 28. At the same time, the command data b at the near end is changed and transmitted to the focus demand 28. When the focus demand 28 inputs the command for changing the setting, the processing of the initial setting processing (steps S10 to S14) is executed again, the changed value of the command data b is input, and the coefficient (b) of the above equation (1) is input. Change the value of). Thus, even when the moving range from the closest end to the infinity end of the focus lens 42 is changed due to the change in the zoom magnification, it is possible to appropriately prevent the unnecessary operation portion from being generated on the focus ring 28A.

On the other hand, when the command for changing the setting is not input, the processing in the normal operation from step S16 is repeatedly executed. As described above, the lens device 12
By generating a position command signal having a resolution corresponding to the required resolution of the focus lens 42 and limiting the range of the output value of the position command signal to the actual moving range of the focus lens 42 (the range from the near end to the infinity end). , Focus demand 28
Can be used for a lens device having an arbitrary resolution, and useless communication and useless operation can be prevented.

In the above embodiment, the focus demand 28 has been described. However, the present invention can be similarly applied to the zoom demand 26. That is,
The resolution of the speed command signal transmitted from the zoom demand 26 to the lens device 12 can be made to match the required resolution of the lens device 12 in the same manner as in the above embodiment. Further, the present invention is not limited to the focus demand 28 and the zoom demand 26, but can be applied to any lens operating device that adjusts the lens of the lens device 12.

In the above embodiment, the required resolution of the lens device 12 is automatically detected and the focus demand 2 is detected.
Although the resolution of the position command signal of No. 8 is adapted to the lens device 12, the present invention is not limited to this, and the user may input the required resolution of the lens device 12 to the focus demand 28 by a changeover switch or the like. A detector (A / D converter 80) for detecting an operation amount of the lens operation device
Even if the resolution of the lens device is lower than the resolution of the lens device, the present invention can make the resolution of the command signal output from the lens operation device apparently higher and match the resolution of the lens device. It is valid.

[0031]

As described above, according to the lens operating device of the present invention, the resolution of the command signal transmitted from the lens operating device to the lens device is changed according to the required resolution of the lens device. The same lens operation device can be used appropriately regardless of the type of lens device (required resolution), and unnecessary communication between the lens operation device and the lens device is reduced to improve the operability of lens adjustment. Can be improved.

Also, by inputting the movement range of the lens from the lens device and converting the operation amount of the operation member of the lens operation device into a command signal within the input movement range of the lens, the operation range of the operation member can be changed. It is possible to prevent a useless operation portion from being generated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a television camera to which a lens operation device according to the present invention is applied.

FIG. 2 is a diagram showing a focus demand as a lens operation device according to the present invention and a circuit configuration of the lens device.

FIG. 3 is a flowchart illustrating a processing procedure of a CPU for a focus demand;

FIG. 4 is an explanatory diagram showing a procedure for converting the resolution of a focus demand.

FIG. 5 is an explanatory diagram showing a procedure for converting the resolution of a focus demand.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Television camera 12 ... Lens apparatus 14 ... Camera body 26 ... Zoom demand 28 ... Focus demand 28A ... Focus ring 40, 70 ... One chip CPU 42 ... Focus lens 48, 72 ... Potentiometer 50, 74 ... CPU 56, 82 ... Serial Communication interface

Claims (3)

[Claims] 1. A lens operation device for generating a command signal for commanding movement of a lens of a lens device based on an operation amount of an operation member and transmitting the command signal to the lens device, wherein the lens device requires Required resolution detection means for detecting the resolution of the command signal; operation amount detection means for detecting the operation amount of the operation member at a predetermined resolution; and operation amount detected by the operation amount detection means detected by the required resolution detection means A lens operation device, comprising: a command signal conversion unit that converts the command signal into a command signal having the specified resolution; and a transmission unit that transmits the command signal obtained by the command signal conversion unit to the lens device. 2. A command signal conversion means for inputting a movement range of the lens from the lens device and indicating a movement amount of the operation member within the entire operation range to indicate a movement position of the lens within the movement range. 2. The lens operation device according to claim 1, wherein the lens operation device converts the signal into a command signal. 3. The lens operation device according to claim 1, wherein the operation member is a focus operation member or a zoom operation member.