JP2002107608A - Lens controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens controller capable of improving operability so that respective lenses can be completely independently controlled by detecting the manipulated variable of a focus ring by an encoder and displacing the position of a lens selected as a target to be controlled on the variation of the focus ring as to the lens controller capable of selecting the control of the focus lens or that of a master lens and controlling the selected lens by operating the focus ring of a focus controller. SOLUTION: The control of the focus lens F or that of the master lens M can be selected by a focus/master changing switch 86 in the focus controller 28. When the focus ring 28A is rotated, the number of pulses outputted from the encoder 82 is applied to a CPU 50 in a lens device 12 as a manipulated variable and the CPU 50 detects the variation of the manipulated variable and displaces the position of the lens selected as the target to be controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens controller, and more particularly to a lens controller for controlling a focus lens and a master lens by driving a motor.

[0002]

2. Description of the Related Art Conventionally, in a lens device used for a broadcast television camera or the like, flange back adjustment for matching an image forming surface on which an image is formed by an optical system of the lens device with an image pickup surface of the camera is performed. There is known an apparatus that can perform the operation by moving a master lens (group). In the lens device in which the master lens is made movable as described above, it is also possible to perform macro shooting or shooting aiming at a special effect such as blurring by moving the master lens from the position (tracking position) where the flange back is adjusted ( JP-A-10-20179, JP-A-1-20179
0-153732).

Japanese Patent No. 2549080 discloses that focus driving and macro driving of a lens device are not controlled by separate controllers, but one of focus driving and macro driving is selected in advance by a predetermined switch. There has been proposed a device which can be controlled separately by an output signal of one potentiometer of one controller. According to this, it is not necessary to separately use a controller for performing the focus drive and the macro drive, and an operation member such as an operation ring can be commonly used, so that the operability is improved and the economy is improved. There are advantages. As for the master lens as described above, if it is possible to switch the control of the focus lens and control the same using the same operating member of one controller, the number of controllers and operating members can be reduced, and operability and economy can be reduced. Is advantageous.

[0004]

However, the application of the apparatus proposed in Japanese Patent No. 2549080 has a problem that the control of the master lens and the control of the focus lens cannot be completely independent. For example, when the control of the focus lens and the control of the master lens can be switched, and the position of the focus lens and the master lens is controlled by the output value of one potentiometer, the control of the master lens is performed from the control of the focus lens. Then, when the output value of the potentiometer is changed, only the position of the master lens is changed based on the output value of the potentiometer. However, when the control is switched to the control of the focus lens after that, since the output value of the potentiometer has been changed, the position of the focus lens may be changed immediately after the change. Similarly, if the output value of the potentiometer is changed during control of the focus lens, the position of the master lens is also changed based on the output value of the potentiometer when switching to control of the master lens. Occurs. The situation where the operation on one lens also affects the other lens in this way,
This is a problem that does not occur when each lens is controlled by operating a separate operation member, and is a disadvantage in operating two types of lenses by operating one operation member, and thus needs to be improved. .

The present invention has been made in view of such circumstances, and when the control of two types of lenses is switched so that each lens can be controlled by operating one operation member, each lens is completely controlled. It is an object of the present invention to provide a lens control device which can be controlled independently of each other to improve operability.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the control of two types of lenses is switched to either one of the controls, and the control of one of the operation members is performed. A lens control device for individually controlling the position of each lens by selecting one of the two types of lenses to be controlled, and performing the operation by setting a constant operation amount of the operation member as one unit. When the operation amount of the member is detected by the number of units and the selection of the lens to be controlled by the selection unit and the operation detection unit having no mechanical end for limiting the operation range of the operation member is switched, the selection is switched The amount of operation detected later by the operation detection means is determined by the amount of change with respect to the amount of operation at the time of the selection switching, and the amount of operation is selected by the selection means based on the amount of change. It is characterized in that a lens and a control means for displacing the position at the time of the selection switching.

[0007] The invention described in claim 2 is the first invention.
Wherein the two kinds of lenses are a focus lens for focus adjustment and a master lens for flange back adjustment, and when the control of the focus lens is selected by the selection unit, the master lens The lens is set at the tracking position set by the flange back adjustment unit.

According to the present invention, when the control of two types of lenses such as a focus lens and a master lens is switched to control each lens by operating one operation member, the operation amount of the operation member is detected. For example, when a lens to be controlled is switched using a detecting means for detecting the operation amount of the operation member by the number of units with a constant operation amount of the operation member as one unit, such as an endless increment type encoder, when the lens to be controlled is switched, Since the position of the lens to be controlled is displaced based on the amount of change in the operation amount of the operation member, when the lens to be controlled is switched, as in the case where the operation amount of the operation member is detected by a potentiometer. The operation of the operation member does not cause the lens to move due to the operation of the operation member until then, and the operation of the operation member with respect to one lens Can eliminate the problem that affects the other lens, it is possible to improve the operability.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lens control 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 system to which the present invention is applied. As shown in FIG. 1, the television camera 10 includes a lens device 12 and a camera body 14. The television camera 10 is supported by a camera platform 18 on a pedestal dolly 16. Head 1
8, two operation rods 22 and 23 are extended, and each of the operation rods 22 and 23 has a lens device 12
The zoom controller 26 and the focus controller 28, which are connected by cables, are attached. The optical system of the lens device 12 is provided with a plurality of lenses (groups) movable in the optical axis direction by driving a motor. The movable lenses (groups) are shown in FIG. Focus lens (group) F, zoom lens (group) in order from the front side
Z is disposed, and a master lens (group) M is disposed behind the Z through an aperture I. The zoom lens Z includes a zoom lens (group) ZA and a correction lens (group) ZB.
The zoom lens ZA and the correction lens ZB move on the optical axis in a fixed relationship. Hereinafter, the movement of the zoom lens ZA and the correction lens ZB in a fixed relationship is referred to as the movement of the zoom lens Z. Also,
The master lens M is used for shooting for special effects such as flange back adjustment, macro shooting, and blurring, and its position is moved. In the master lens M, a part of the lens group may move or the entire lens group may move.

The zoom controller 26 is provided with a thumb ring 26A rotatable in both directions from a reference position. When the thumb ring 26A is rotated, an operation amount (rotation direction and rotation amount) from the reference position is provided. Is supplied from the zoom controller 26 to the lens device 12, and the zoom lens Z of the lens device 12 moves to the wide side or the tele side.

The focus controller 28 is provided with a rotatable focus ring 28A. When the focus ring 28A is rotated, the focus demand according to the operation amount (rotation direction and rotation amount) is required. A signal is given from the focus controller 28 to the lens device 12, and the focus lens F of the lens device 12 moves to the near side or infinity side. As will be described later, the focus controller 28 is provided with a focus / master changeover switch. When this changeover switch is set to the master side, a rotation operation of the focus ring 28A causes the master lens of the lens device 12 to rotate. M moves. Further, the focus controller 28 is provided with a macro ON switch. When the macro ON switch is turned on, a signal for turning on macro photography is given from the focus controller 28 to the lens device 12, and the master lens M is turned on. The camera is moved to a predetermined macro position for macro photography so that macro photography can be performed.

FIG. 3 is a block diagram showing the configuration of the lens control device according to the present invention. As shown in the figure, the lens device 12 has a focus lens F and a master lens M arranged in the optical system, and a CPU for controlling the focus lens F and the master lens M.
50, a focus drive circuit 52, a master lens drive circuit 62, a motor 54, a motor 64, and the like. still,
In the optical system of the lens device 12, the zoom lens Z and the iris I are arranged as described above, and these are also driven by a motor. However, the zoom lens Z and the iris I are not shown, and they are driven. The configuration for this and its description are omitted.

The focus drive circuit 52 receives a focus control signal from the CPU 50 for moving the focus lens F to a predetermined target position (hereinafter, referred to as a focus target position). Note that the value indicating the focus target position does not always match the value of the focus control signal, but for simplicity of description, the focus control signal will assume a value that matches the focus target position in the following. In addition, the current position of the focus lens F (hereinafter, referred to as focus current position) is input from the position sensor 56 shown in FIG. The rotation direction and the rotation speed (hereinafter, simply referred to as the rotation speed including the rotation direction and the rotation speed) are input from the tacho generator 58 in FIG. The position information indicating the current focus position is obtained from the position sensor 56 as C
It is also provided to PU50.

The focus drive circuit 52 compares the focus control signal (focus target position) with the current focus position, obtains a target rotational speed corresponding to the difference between the positions, and obtains a motor 54 obtained from a tachogenerator 58. The driving voltage is supplied to the motor 54 such that the rotation speed of the motor 54 becomes the target rotation speed. Thus, the rotation speed of the motor 54 is controlled and the focus lens F
Is moved in a direction approaching the focus target position, and when the current focus position matches the focus target position, the rotation of the motor 54 is stopped. Therefore, the focus lens F moves to the focus target position specified by the CPU 50 and stops.

Similarly to the focus drive circuit 52, the master lens drive circuit 62 receives a master lens control signal for moving the master lens M to a predetermined target position (hereinafter, referred to as a master lens target position). Provided by the CPU 50. Note that the value indicating the master lens target position and the value of the master lens control signal do not always match with the focus control signal, as in the case of the focus control signal. Shall be taken. The master lens drive circuit 62 receives the current position of the master lens M (hereinafter referred to as the master lens current position) as position information of the master lens M from the position sensor 66 in FIG.
The rotation direction and rotation speed of the motor 64 that drives
The rotation speed (including the rotation direction and the rotation speed) is input from the tacho generator 68 in FIG. The position information indicating the current position of the master lens is transmitted from the position sensor 6.
6 to the CPU 50.

The master lens drive circuit 62 compares the master lens control signal (master lens target position) with the master lens current position, obtains a target rotational speed according to the difference between the positions, and obtains a tachometer 68.
The driving voltage is supplied to the motor 64 so that the rotation speed of the motor 64 obtained from the above becomes the target rotation speed. Thus, the rotation speed of the motor 64 is controlled, and the master lens M is moved in a direction approaching the master lens target position. When the master lens current position matches the master lens target position, the rotation of the motor 64 is stopped. Therefore, the master lens M moves to the master lens target position specified by the CPU 50 and stops.

The CPU 50 sends the focus target position to be output to the focus drive circuit 52 as a focus control signal to the focus drive circuit 52 and the master lens target position to be output to the master lens drive circuit 62 as a master lens control signal to the lens device 12 as described above. The determination is made based on a signal from the provided master lens command unit 70 or macro ON switch 72 or a signal from the focus controller 28 connected to the lens device 12. Note that the zoom controller 26 shown in FIG. 1 is used for controlling the zoom lens Z, and thus the description is omitted.

The master lens command section 70 allows a user to adjust the position of the master lens M by operating a predetermined operation member (hereinafter, referred to as a flange back adjustment knob) when performing a flange back adjustment or the like. The flange back adjustment knob is installed on a lens mount plate of the lens device 12, for example. The operation amount (rotation amount) of the flange back adjustment knob is detected by a potentiometer or an encoder (rotary encoder), and the operation amount of the flange back adjustment knob is input to the CPU 50 as a master lens command signal. .

When the operation amount of the flange-back adjustment knob is detected by a potentiometer, the CPU 50 provides a value (voltage value) indicating the absolute operation amount of the flange-back adjustment knob from a specific reference position.
Is given as a master lens command section signal. In this case, the CPU 50 determines the position of the master lens M (master lens position) corresponding one-to-one with the operation amount as the master lens target position. The range of the value indicating the master lens target position and the range of the value indicating the operation amount of the flange back adjustment knob given from the master lens command unit 70 do not always match, but for the sake of simplicity, these will be described below. Are assumed to be in the same range. At this time, the master lens target position is set to a position that matches the value of the operation amount of the flange back adjustment knob. The CPU 50 outputs the master lens target position thus determined to the master lens drive circuit 62 as a master lens control signal as described above. As a result, the master lens M moves according to the user operation of the flange back adjustment knob,
The flange back adjustment knob is set at a position corresponding to the operation amount from a specific reference position. The master lens position designated by the flange back adjustment knob of the master lens command unit 70 is hereinafter referred to as a tracking position.

On the other hand, when the operation amount of the flange back adjustment knob is detected by an encoder (endless increment type encoder), the pulse output from the encoder is output for every constant operation amount (rotation amount) of the flange back adjustment knob. The number (the number of pulses) is accumulated as the operation amount of the flange back adjustment knob, and the accumulated operation amount is given to the CPU 50 as a master lens command section signal. Incidentally, for example, a two-phase pulse output type encoder is adopted, and the operation direction of the flange back adjustment knob is also considered. Hereinafter, in the accumulation of the number of pulses output from the encoder, the operation direction is the forward rotation direction. In some cases, the number of pulses is added, and in the reverse direction, the number of pulses is subtracted.

In this case, the CPU 50 determines how much the operation amount (number of pulses) of the flange back adjustment knob newly given by the master lens command signal from the master lens command unit 70 changes from the previously given operation amount. Is calculated and added to the previously determined master lens target position by the amount of displacement corresponding to the amount of change (hereinafter, referred to as the amount of change of the flange back adjustment knob). Then, the obtained position is determined as a new master lens target position. The change amount of the franbac adjustment knob does not always coincide with the displacement amount of the master lens position corresponding to the change amount. However, in order to simplify the explanation, it is assumed that these values coincide in the following. In this case, the new master lens target position is obtained by adding the change amount of the flange back adjustment knob to the previous master lens target position. The CPU 50 outputs the master lens target position thus determined to the master lens drive circuit 62 as a master lens control signal as described above. As a result, the master lens M moves according to the user operation of the flange back adjustment knob,
The position is set to a position displaced by a displacement amount corresponding to the change amount of the flange back adjustment knob. When the first master lens target position is determined based on the amount of change in the flange back adjustment knob, a reference position to which the amount of change is added is required. The position can be used as the reference position, or a predetermined reference position can be stored in the memory 74. Further, as described above, the accumulation of the number of pulses output from the encoder may be performed not by the master lens command unit 70 but by the CPU 50.

The macro ON switch 72 is a switch operated by the user when switching between normal photographing and macro photographing. For example, the macro ON switch 72 is installed on the lens mount plate similarly to the above-mentioned flange back adjustment knob. The macro ON switch 72 is turned on (macro shooting) or off (normal shooting), and a signal indicating the on / off state is given to the CPU 50 as switch information. When the macro ON switch 72 is turned off (in the case of normal photographing), the CPU 50 focuses on the basis of the master lens command section signal given from the master lens command section 70 as described above, or as described later. The master lens target position is determined based on the demand signal given from the controller 28, and the master lens target position is output to the master lens drive circuit 62 as a focus control signal.

On the other hand, when the macro ON switch 72 is turned on (in the case of macro shooting), the CPU 50 reads out information on the macro position stored in the memory 74 in advance, and determines the macro position as the master lens target position. . The master lens driving circuit 6 uses the master lens target position as a master lens control signal.
Output to 2. As a result, the master lens M moves to the macro position, and the optical system of the lens device 12 is automatically switched to the state of macro photography. Here, memory 7
The information on the macro position stored in 4 is stored as the movement amount (master lens movement amount α) with respect to the tracking position of the master lens M that has been subjected to the flange back adjustment by the master lens command unit 70 as described above. The position is obtained as a position at which the master lens M is moved from the tracking position by the moving amount. The master lens movement amount stored in the memory 74 is such that, for example, when the zoom is set to the wide end and the focus is set to the closest end, an object 100 mm from the front lens of the optical system is focused. In addition, the master lens movement amount differs depending on the lens magnification of the optical system of the lens device 12.

The focus controller 28 is connected to the lens device 12 by a cable as an accessory device of the lens device 12, and various signals are transmitted between the CPU 80 built in the focus controller 28 and the CPU 50 of the lens device 12 by serial communication or the like. You can exchange. The zoom controller 26 and other accessory devices such as a personal computer are also connected to the lens device 12 by cables and the like, and the CPU built in each accessory device.
Thus, various signals can be exchanged with the CPU 50 of the lens device 12. The focus controller 28 allows the position of the focus lens F to be adjusted by rotating the focus ring 28A (see FIG. 1) when the user performs the focus adjustment in principle. The control target is switched to the master lens M by the / master switch 86, and the position of the master lens M can be controlled by rotating the focus ring 28A.

FIG. 4 is an external view of the focus controller 28. As shown in the drawing, a focus ring 28A is rotatably provided on a main body 28B of the focus controller 28. Also, the macro 28B has a macro ON
Switch 84, focus / master switch 8
6. A reverse switch 88 is provided, and an LED 9 for displaying the ON / OFF state of the macro ON switch 84
0A, ON / OFF of focus / master switch 86
LED 90B for displaying OFF state, focus lens F
Alternatively, an LED 90C that indicates that the master lens M has reached the end end is provided. As shown in FIG. 3, the rotation operation of the focus ring 28A is performed by the encoder 82.
, And a pulse output from the encoder 82 for each constant operation amount (rotation amount) is input to the CPU 80. The macro ON switch 84, the focus / master changeover switch 86, and the reverse switch 88 are turned on or off, respectively, and a signal indicating the on / off state is input to the CPU 80. In addition, the LE
The D90A to 90C (LED unit 90) can be switched on / off or on / off color under the control of the CPU 80.

The macro ON switch 84 is a switch for switching between normal photographing and macro photographing similarly to the macro ON switch 72 provided in the lens device 12, and the ON / OFF state of the macro ON switch 84 is as follows.
As switch information from the CPU 80, the C
Sent to PU50. CPU 50 of lens device 12
Is a macro ON switch 7 provided in the lens device 12.
In the same manner as when the macro lens 2 is turned on or off, the master lens target position is determined according to the on / off state of the macro ON switch 84. For example, when the macro ON switch 84 is turned on (in the case of macro shooting), the CPU 50 reads information on the macro position stored in the memory 74 in advance and determines the macro position as the master lens target position. Then, it outputs the master lens target position to the master lens drive circuit 62 as a master lens control signal. When the macro ON switch 84 is switched from off to on, the CPU 80 of the focus controller 28 switches the LED 90A from off to on.

Focus / master switch 86
Is a switch for switching the control target to be controlled by the CPU 50 of the lens device 12 to the focus lens F or the master lens M based on the operation of the focus ring 28A. When the focus / master switch 86 is turned off, the focus lens F When the focus / master switch 86 is turned on, the control is switched to the control of the master lens M.
The on / off state of the focus / master changeover switch 86 is transmitted from the CPU 80 to the CPU 50 of the lens device 12 as switch information. C of the lens device 12
The PU 50 switches between control of the focus lens F and control of the master lens M in accordance with the on / off state of the focus / master switch 86, and a demand signal based on the operation of the focus ring 28A from the focus controller 28 as described later. When given, the target position of the lens to be controlled is determined based on the demand signal. When the focus / master switch 86 is switched from off to on, the CPU 80 of the focus controller 28 switches the LED 90B from green to red, for example.

The reverse switch 88 is a switch for reversing the direction of movement of the focus lens F or the master lens M with respect to the direction of rotation of the focus ring 28A. When the reverse switch 88 is switched from off to on, the CPU 80 turns on the focus. The amount of operation of the focus ring 28A is detected with the forward rotation direction of the ring 28A as the reverse rotation direction and the reverse rotation direction as the forward rotation direction.

The encoder 82 for detecting the operation of the focus ring 28A is an endless incremental rotary encoder similar to the encoder described in the above-mentioned master lens command unit 70, and is a mechanical device for limiting the operation amount of the focus ring 28A. Has no restrictions. The focus ring 28 is provided from the encoder 82 to the CPU 80.
One pulse is input for each constant operation amount (rotation amount) of A. The CPU 80 accumulates the number of pulses input from the encoder 82, and stores the number of pulses in the focus ring 28A.
Is detected as the manipulated variable of. Incidentally, for example, a two-phase pulse output type is adopted as the encoder 82, and the focus ring 28
The rotation direction of A is also considered, and in the accumulation of the number of pulses output from the encoder 82, the number of pulses is added when the rotation direction is the forward direction, and is subtracted when the rotation direction is the reverse direction. Yes (reverse switch 8
When 8 is turned on, the pulse number is subtracted when the rotation direction is the forward rotation direction, and the pulse number is added when the rotation direction is the reverse rotation direction). The operation amount of the focus ring 28A detected as described above is given to the CPU 50 of the lens device 12 from the CPU 80 as a demand signal.

The CPU 50 has a focus ring 28A newly given by a demand signal from the CPU 80.
Is calculated from the operation amount of the focus ring 28A given last time.
The amount of displacement corresponding to the amount of change (hereinafter referred to as the amount of change of the focus ring 28A) is added to the previously determined target position for the lens to be controlled. Although the amount of change of the focus ring 28A and the amount of displacement of the lens corresponding to the amount of change do not always match, it is assumed that these values match in the following for the sake of simplicity. In this case, the new target position is obtained by adding the change amount of the focus ring 28A to the previous target position.

As described above, the control target is switched by the on / off state of the focus / master switch 86. For example, when the focus / master switch 86 is on, that is, when the control of the focus lens F is selected. If yes, the CPU 50 adds the change amount of the focus ring 28A calculated as described above to the focus target position determined last time. Then, the position thus obtained is determined as a new focus target position, and the focus target position is output to the focus drive circuit 52 as a focus control signal. by this,
The focus lens F moves according to a user operation of the focus ring 28A, and is set at a position displaced by a displacement amount corresponding to a change amount of the focus ring 28A.
When the first focus target position is determined based on the amount of change in the focus ring 28A after the power is turned on, a reference position to which the amount of change is added is required.
The current focus position obtained from the position sensor 56 can be used as the reference position.
The predetermined reference position may be stored in the memory. When the focus position acquired from the position sensor 56 reaches the end position of the movable range, the CPU 50 transmits a notification to that effect to the CPU 80 of the focus controller 28. Thereby, the CP of the focus controller 28
U80 switches the LED 90C from off to green lighting, for example, to notify the user that the focus lens F has reached the end position. This display takes into account that since the endless encoder 82 is used, the rotation of the focus ring 28A is not restricted and the user cannot recognize the end position of the focus lens F from the operational feeling of the focus ring 28A. It is. Also, the green lighting
When the control of the focus lens F is selected by the focus / master switch 86, the LED
90B corresponds to the color of lighting.

On the other hand, when the focus / master switch 86 is ON, that is, when the control of the master lens M is selected, the CPU 50 determines the amount of change of the focus ring 28A in the same manner as described above. Add to position. Then, the position thus obtained is determined as a new master lens target position, and the master lens target position is output to the master lens drive circuit 62 as a master lens control signal. As a result, the master lens M moves in accordance with a user operation of the focus ring 28A, and is set at a position displaced by a displacement amount corresponding to a change amount of the focus ring 28A. When the first master lens target position is determined based on the change amount of the focus ring 28A after the power is turned on, a reference position to which the change amount is added is required.
For example, the master lens current position obtained from the position sensor 66 can be used as its reference position,
A predetermined reference position may be stored in the memory 74. Further, when a potentiometer is used for detecting the operation amount of the flange back adjustment knob of the master lens command unit 70, the master lens position (tracking position) indicated by the potentiometer may be used as the reference position. When the master lens position acquired from the position sensor 66 reaches the end position of the movable range, the CPU 50 transmits the fact to the CPU 80 of the focus controller 28. As a result, the CPU 80 of the focus controller 28 switches the LED 90C from the unlit state to, for example, the red state, and notifies the user that the master lens M has reached the end position. The red lighting corresponds to the color in which the LED 90B lights up when the control of the master lens M is selected by the focus / master changeover switch 86.

When the endless encoder 82 is used instead of the potentiometer to detect the operation amount of the focus ring 28A as described above, the following operation is performed when the control target is switched by the focus / master switch 86. There are advantages. That is, when a potentiometer is used to detect the operation amount of the focus ring 28A, the control of the master lens M is selected by the focus / master switch 86 and the focus ring 2 is controlled.
8A is rotated, and then the control is switched to the control of the focus lens F. When the focus lens F completes the operation of the master lens M, the focus ring F
The problem of moving to the position 8A occurs. If the position of the focus lens F is displaced by the amount of change of the focus ring 28A using the encoder 82 as in the present embodiment, such a problem can be prevented. That is, when the control of the master lens M is switched to the control of the focus lens F by the focus / master changeover switch 86, the position of the focus lens F can be displaced based on the subsequent change amount of the focus ring 28A. In addition, it is possible to prevent a problem that the operation of the focus ring 28A with respect to the master lens M affects the position of the focus lens F. Similarly, when the control of the focus lens F is switched from the control of the focus lens F to the control of the master lens M by the focus / master changeover switch 86, it is possible to prevent a problem that the operation of the focus ring 28A on the focus lens F affects the position of the master lens M. it can. It is also possible to use a potentiometer to detect the operation amount of the focus ring 28A and control the positions of the focus lens F and the master lens M with the change amount of the focus ring 28A as in the present embodiment. However, since the correspondence between the detection range of the potentiometer and the movable range of each lens is deviated, and such a problem occurs that each lens cannot be moved to the end position, such control is not preferable for the potentiometer.

The CPU 50 of the lens device 12 as described above
Will be described with reference to the flowcharts of FIGS. 5 to 10. FIG. 5 shows a main routine of the CPU 50. When the power is turned on, the CPU 50 first performs an initial setting (step S10). In the initial setting, for example, the current focus position is acquired from the position sensor 56, and the current focus position is set as the initial value of the parameter FC indicating the focus control signal (focus target position). That is, the reference position for determining the first focus target position is set to the current focus position.
As another method, the value of the focus control signal when the power is turned off can be read from the memory 74 and the value can be used as the initial value of the focus control signal FC. In this case, it is necessary to store at least the value of the focus control signal FC in the memory 74 when the power is turned off. Also,
As described above, when the encoder is used to detect the operation amount of the flange back adjustment knob of the master lens command unit 70, the parameter MC indicating the master lens control signal (master lens target position) as well as the focus control signal.
It is necessary to set the initial value of the focus control signal F
This initial setting is performed in exactly the same way as the initial value of C.

When the above-described initialization processing is completed, the CPU 50 repeatedly executes the following processing. Although the order of the following processes can be arbitrarily changed, first, a zoom process for controlling the zoom lens Z is performed (step S1).
2). The details of the zoom processing will be omitted, but the CPU
Reference numeral 50 controls the zoom lens Z by driving a motor based on a demand signal (generally, a signal instructing a moving speed of the zoom lens Z in zoom control) provided from the zoom controller 26. Next, the CPU 50 performs focus processing for controlling the focus lens F (step S14), and subsequently performs master lens processing for controlling the master lens M (step S16). The details of the focus processing and the master lens processing will be described later. Next, the CPU 50 performs an iris process for controlling the iris I (step S18). Although details of the iris processing are omitted, the CPU 50 controls the aperture value by driving the iris I with a motor based on a signal from, for example, a camera body or a predetermined controller. CPU
50 repeatedly executes the processing of the above-described steps S12 to S18.

Next, the details of the focus processing in step S14 will be described with reference to the flowchart of FIG. First, the CPU 50 reads the current focus position from the position sensor 56 as focus position information (step S20). Next, the on / off state of the macro ON switch 84 and the focus / master changeover switch 86 and the on / off state of the macro ON switch 72 of the lens device 12 are read from the focus controller 28 as switch information (step S22).
Subsequently, a demand signal, that is, an operation amount (number of pulses) of the focus ring 28A is read from the focus controller 28 (step S24). And CPU5
0 is the current step S in the main routine of FIG.
The operation amount (demand signal) of the focus ring 28A read in step S24 is compared between the focus processing of step 14 and the focus processing of the previous step S14, and the operation amount newly read this time and the operation amount (read demand) read last time are compared. Signal) to calculate a change amount (a change amount of the focus ring 28A) ΔD (step S).
26).

Next, the CPU 50 proceeds to step S22.
Whether the focus / master switch 86 read from the focus controller 28 is on or off.
That is, it is determined whether the control of the focus lens F is selected (when the focus / master switch 86 is off) or the control of the master lens M is selected (when the focus / master switch 86 is turned on). Step S28). If it is determined that the control of the focus lens F has been selected, the change amount ΔD of the focus ring 28A calculated in step S26 is added to the previous focus control signal (focus target position) FC,
The value is used as a new focus control signal FC (step S30). That is, FC = FC + ΔD. Then, the new focus control signal FC is stored in the memory 74 (step S32). The reason why the focus control signal FC is stored in the memory 74 is that the initial setting (step S10) in FIG.
This is necessary when the initial value of the focus control signal FC is used as the value of the focus control signal at the time of power off stored in the memory 74, and the initial value of the focus control signal FC is obtained from the position sensor 56 as described above. If the current focus position is set, the processing in step S32 is not always necessary. Subsequently, the CPU 50 outputs the new focus control signal FC calculated in step S30.
Is output to the focus drive circuit 52 as described above (step S36), and the focus lens F is moved to the position of the focus control signal FP. Thus, the focus lens F is set at a position displaced from the original position by the amount of change of the focus ring 28A.

On the other hand, if it is determined in step S28 that the control of the master lens M has been selected,
The PU 50 uses the previous focus control signal FC as a new focus control signal FC as it is (step S3).
4). That is, FC = FC. Then, the focus control signal FC is output to the focus drive circuit 52 as described above (step S
36). Thus, when the control of the focus lens F is switched to the control of the master lens M by the focus / master switch 86, the focus control signal FC is immediately before the switch is performed even if the focus ring 28A is operated. The focus control signal is held at the value of the focus control signal, and the focus lens F is held at a position stopped at the position of the focus control signal. Thus, the focus processing is completed, and the process returns to the flowchart of FIG.

Next, the details of the master lens process in step S16 of FIG. 5 will be described with reference to the flowcharts of FIGS. As described above, a potentiometer or an encoder can be used to detect the operation amount of the flange back adjustment knob of the master lens command section 70 provided in the lens device 12, and the master lens processing can be performed depending on which one is used. Because the contents are different,
FIGS. 7 and 8 show the master lens processing when the potentiometer is used, and FIGS. 9 and 10 show the processing when the encoder is used.

First, the master lens processing when a potentiometer is used for detecting the operation amount of the flange back adjustment knob of the master lens command section 70 will be described.
As shown in FIG. 7, the CPU 50 first reads the current position of the master lens from the position sensor 66 as position information of the master lens M (step S40). Then, C
The PU 50 receives a master lens command signal from the master lens command unit 70, that is, the flange back adjustment knob 70.
Is read (step S42). Since the operation amount of the flange back adjustment knob 70 is detected by a potentiometer, the value indicates the tracking position of the master lens M (the position of the master lens M for flange back adjustment). The amount of operation of the knob 70 is MOP as a value indicating the tracking position.

Next, the CPU 50 sets the macro ON / OFF.
Processing is performed (step S44). This macro ON / OF
The F process includes a macro ON switch 72 of the lens device 12 and a macro ON switch 84 of the focus controller 28.
Is a process of determining whether to turn macro shooting on or off depending on the on / off state of each of the macros. For example, if one of them is turned on, a method of turning on macro shooting or a macro ON switch operated later The processing is performed based on a determination method such as a post-operation priority method for switching macro photography on or off based on the on / off state. With this processing, the CPU 50 determines whether the macro shooting is on or off (step S46).
50 sets the master lens control signal (master lens target position) MC as a macro position for macro photography (step S48). That is, as described above, the master lens movement amount α from the tracking position stored in advance as information on the macro position in the memory 74 is read out,
The tracking position (the operation amount of the flange back adjustment knob 70) obtained in the above step S42 by the following equation: MC = MOP + α
The value obtained by adding the master lens movement amount α to the MOP is determined as the master lens control signal MC. Then, the master lens control signal MC is output to the master lens drive circuit 62 as described above (step S60). Thereby, the master lens M is set at the macro position. At this time, the focus lens F may be moved to a predetermined position for macro photography (for example, the closest end), and may return to the original position when the macro photography is turned off.

On the other hand, if it is determined in step S46 that the switch is off, that is, if normal shooting is being performed, as shown in the flowchart of FIG. 8, the CPU 50 first determines from the switch information acquired in step S22 of FIG. It is determined whether the focus / master switch 86 is on or off, that is, whether control of the focus lens F or control of the master lens M is selected by the focus / master switch 86 (step S50). If it is determined that the control of the master lens M is selected, the CPU 50 determines the change amount Δ of the focus ring 28A calculated in step S26 of FIG.
D is added to the previous accumulated value ΔD ′ to calculate a new accumulated value ΔD ′ (step S52). That is, ΔD ′ = ΔD ′ + ΔD is calculated. Immediately after switching from the control of the focus lens F to the control of the master lens M, the accumulated value ΔD ′ is reset to 0 by the processing of step S58 described later. Next, the CPU 50 determines the master lens control signal MC by adding the accumulated value ΔD ′ of the change amount calculated in step S52 to the tracking position MOP (step S54). That is, MC = MOP + ΔD ′. Then, in FIG. 7, the master lens control signal MC is output to the master lens drive circuit 62 as described above (step S60). As a result, the master lens M is displaced from the original position by the change amount of the focus ring 28A, and the focus ring 28A after the control of the focus lens F is switched to the control of the master lens M by the focus / master switch 86. Tracking position MOP by the cumulative amount of change in
Displaced from If the flange back adjustment knob of the master lens command unit 70 is operated when the control of the master lens M is selected, the tracking position MOP is set.
Is changed, and the master lens M is moved by the operation of the flange back adjustment knob, as is apparent from the processing in step S54.

On the other hand, if it is determined in step S50 in FIG. 8 that the control of the master lens M has been selected, the CPU 50 determines the master lens control signal MC as the tracking position MOP. That is, MC = MOP is set (step S56). Next, the accumulated value ΔD ′ of the change amount of the focus ring 28A is cleared to 0 (step S58). Then, in FIG. 7, the master lens control signal MC is output to the master lens drive circuit 62 as described above (step S60). Thereby, the master lens M is set to the tracking position MOP specified by the master lens command unit 70. At this time, if the flange back adjustment knob is operated, the tracking position MOP changes, and the master lens M moves to that position. Also, by setting the accumulated value ΔD ′ = 0 in step S58, when the control target is later switched from the focus lens F to the master lens M, the state in which the master lens M stops at the tracking position and the subsequent focus ring 28A Will move in accordance with the amount of change in. With the above, the master lens process ends, and the process returns to the flowchart of FIG.

Next, the master lens processing when the encoder is used for detecting the operation amount of the flange back adjustment knob of the master lens command section 70 will be described. As shown in FIG. 9, first, the CPU 50 reads the current position of the master lens from the position sensor 66 as the position information of the master lens M (step S70). Then, CPU5
0 reads the master lens command section signal from the master lens command section 70, that is, the operation amount of the flange back adjustment knob 70 (step S72). Since the operation amount of the flange back adjustment knob 70 is detected by the encoder, the value is the number of pulses output from the encoder. Then, the CPU 50 compares the operation amount of the flange back adjustment knob read in step S72 in the master lens process of the present step S16 and the master lens process of the previous step S16 in the main routine of FIG. The change amount (change amount of the flange back adjustment knob) ΔL is calculated from the read operation amount and the previously read operation amount (step S7).
4).

Next, the CPU 50 proceeds to step S4 in FIG.
Macro ON / OFF processing is performed in the same manner as the processing described in step 4 (step S74), and it is determined whether macro shooting is on or off (step S78).
The PU 50 sets the master lens control signal (master lens target position) MC as a macro position for macro shooting (step S80). That is, as described above, the memory 74
The master lens movement amount α from the tracking position stored in advance as information on the macro position is read out, and is determined as the master lens control signal MC by the following equation: MC = MOP + α. Here, MOP indicates the tracking position of the master lens M specified by the master lens command unit 70. This tracking position MOP is set in step S90 described later, and the initial value before the processing of step S90 is performed is , FIG. 5 (step S1)
0) Initially set master lens control signal M
The value of C is substituted. The initial value of the master lens control signal MC is set to the master lens current position acquired from the position sensor 66 when the power is turned on, or to the value of the master lens control signal when the power is turned off. The CPU 50 outputs the master lens control signal MC determined in this way to the master lens drive circuit 62 as described above (step S94). Thereby, the master lens M is set at the macro position.

On the other hand, if it is determined in step S78 that the camera is turned off, that is, if normal shooting is performed,
As shown in the flowchart of FIG.
It is determined from the switch information acquired in step S22 in FIG. 6 whether the focus / master switch 86 is on or off, that is, whether the control of the focus lens F or the control of the master lens M is selected (step). S82). If it is determined that the control of the master lens M is selected, the CPU 50 determines the change amount ΔD of the focus ring 28A calculated in step S26 of FIG. 6 and the change in the flange back adjustment knob calculated in step S74. The amount ΔL is added to those cumulative values ΔM up to the previous time to calculate a new cumulative value ΔM (step S84). That is, ΔM = ΔM + ΔD + ΔL. Next, the CPU 50 sets the tracking position MO
P is the accumulated value ΔM of the variation calculated in step S52.
Are added to determine the master lens control signal MC (step S54). That is, MC = MOP + ΔM. Then, the master lens control signal MC is output to the master lens drive circuit 62 as described above in FIG. 9 (step S60). As a result, the master lens M is displaced from the original position by the amount of addition of the amount of change of the focus ring 28A and the amount of change of the flange back adjustment knob, and the focus / master switch 86 controls the control of the focus lens F to change the master lens. After the switching to the control of M, the tracking position MOP is displaced from the tracking position MOP by the cumulative amount of the added amount.

On the other hand, in step S82 in FIG.
If it is determined that the control object is the master lens M, CP
U50 sets the above-described step S7 to the tracking position MOP.
The change amount ΔL of the flange back adjustment knob calculated in step 4 is added, and the value is determined as the master lesbian control signal MC (step S88). That is, MC = MOP + ΔL. Subsequently, the new tracking position MOP is used as the master lens control signal MC (Step S).
90), the master lens control signal MC is stored in the memory 74 (step S92). The reason why the master lens control signal MC is stored in the memory 74 is that it is necessary to set the initial value of the master lens control signal MC to the value of the master lens control signal when the power is turned off. When the initial value of is the master lens current position obtained from the position sensor 66, the processing in step S92 is not necessarily required. Then CP
U50 clears the accumulated value ΔM to 0 (step S93). Then, the master lens control signal MC calculated in step S88 in FIG. 9 is output to the master lens drive circuit 62 as described above (step S94).
As a result, the master lens M moves to a position displaced by the amount of change of the flange back adjustment knob of the master lens command section 70, and that position is changed to a new tracking position. Also, in step S93, the cumulative value ΔM
By setting to = 0, when the control of the focus lens F is later switched from the control of the focus lens F to the control of the master lens M by the focus / master switch 86, the state in which the master lens M is stopped at the tracking position and the focus ring 28A It moves according to the amount of change. With the above, the master lens process ends, and the process returns to the flowchart of FIG.

As described above, in the above embodiment, the calculation of the focus target position (focus control signal) and the master lens target position (master lens control signal) is performed by the CPU 50 of the lens device 12. The above-described processing of the CPU 50 may be performed by the CPU 80 of the focus controller 28, and the result may be provided to the CPU 50 of the lens device 12.

In the above-described embodiment, a case has been described in which the control of the focus lens F and the master lens M can be controlled by one operation member (focus ring 28A). It is also possible to control two kinds of lenses such as Z and master lens M or focus lens F and zoom lens Z by one operation member as described above.

In the above embodiment, the focus /
Set the master switch 86 to the focus controller 2
8, but may be provided in the lens device 12.

In the above-described embodiment, the macro ON switch 84 is provided in the focus controller 28. However, the present invention is not limited to this, and the macro ON switch 84 can be provided in any controller (attached device).

[0053]

As described above, according to the lens control apparatus of the present invention, control of two types of lenses such as a focus lens and a master lens is switched, and each lens is controlled by operating one operation member. When detecting the operation amount of the operation member, for example, using a detection means for detecting the operation amount of the operation member by the number of units with a constant operation amount of the operation member as one unit, such as an endless increment type encoder, When the lens to be switched is switched,
Since the position of the lens to be controlled is displaced based on the change amount of the operation amount of the operation member thereafter, the lens to be controlled is switched as in the case where the operation amount of the operation member is detected by a potentiometer. At this time, the situation in which the lens is moved by the operation of the operation member up to that time does not occur, and the problem that the operation of the operation member on one lens affects the other lens can be resolved, and the operability can be improved. Can be planned.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating a configuration of a lens movably disposed in an optical system of a lens device.

FIG. 3 is a block diagram showing a configuration of a lens control device according to the present invention.

FIG. 4 is an external view of a focus controller.

FIG. 5 is a flowchart illustrating a processing procedure of a main routine of a CPU of the lens device;

FIG. 6 is a flowchart illustrating a processing procedure of focus processing by a CPU of the lens device;

FIG. 7 is a flowchart illustrating a processing procedure of a master lens process when a potentiometer is used for operation detection of a flange back adjustment knob of a master lens command unit;

FIG. 8 is a flowchart illustrating a processing procedure of a master lens process when a potentiometer is used for operation detection of a flange back adjustment knob of a master lens command unit.

FIG. 9 is a flowchart illustrating a processing procedure of a master lens process when an encoder is used to detect an operation of a flange back adjustment knob of a master lens command unit.

FIG. 10 is a flowchart illustrating a processing procedure of a master lens process when an encoder is used to detect operation of a flange back adjustment knob of a master lens command unit;

[Explanation of symbols]

12: lens device, 28: focus controller, 2
8A: Focus ring, F: Focus lens, M ...
Master lens, 50, 80 CPU, 52 Focus drive circuit, 54, 64 Motor, 62 Master lens drive circuit, 70 Master lens command section, 72, 84
... Macro ON switch, 74 ... Memory, 82 ... Encoder, 86 ... Focus / master switch

Claims (2)

[Claims] 1. A lens control device that switches control of two types of lenses to one of the controls and individually controls a position of each lens based on an operation of one operation member. Selecting means for selecting any one of the lenses to be controlled; detecting the operation amount of the operation member by the number of units with a constant operation amount of the operation member as one unit; and restricting an operation range of the operation member. When the selection of the lens to be controlled by the operation detecting means having no mechanical end and the selection means is switched, the operation amount detected by the operation detecting means after the selection switching is changed to the operation amount at the time of the selection switching. Control means for determining a changed amount with respect to the lens, and displacing the lens selected by the selecting means from a position at the time of the selection switching based on the changed amount. Lens control device characterized in that was e. 2. The two types of lenses are a focus lens for focus adjustment and a master lens for flange back adjustment, and when the control of the focus lens is selected by the selection unit, the master lens is used. 2. The lens control device according to claim 1, wherein the tracking position is set to a tracking position set by the flange back adjustment unit.