JP4692981B2 - Optical device - Google Patents

Description

  The present invention relates to an optical device used for a television camera, a video camera, a television lens, a video lens, and the like.

In a conventional system called ENG (Electronic news gathering), such as the news system described in Patent Document 1, for example, the ENG zoom lens is attached to the ENG camera and reported, relayed, drama, variety, documentary There are known optical devices that determine whether to operate the focus on demand or manually according to the shooting content, shooting location, shooting situation, photographer's preference, and the like.
In such an optical device, when operating on demand, the focus controls the focus lens by a control signal proportional to the operation rotation angle of the demand (see, for example, Patent Document 2). When driving manually, the focus lens is controlled by an optical device that controls the focus lens using a control signal proportional to the focus operation rotation angle and a control signal proportional to the angular velocity of the focus operation rotation angle. There is an optical device that adopts a method to do this. These are selectively used according to the contents of shooting such as news reports, broadcasts, dramas, varieties, documentaries, etc., shooting locations, shooting conditions, and photographer's preferences.

For example, when an ENG zoom lens and an ENG camera are mounted on a tripod and taking a picture, the photographer is located at the rear of the camera, and it becomes difficult to operate the focus. Used.
In addition, when fine control of the focus is required or when the focus operation is performed while checking the focus scale line, the ENG that controls the focus lens with a control signal proportional to the focus operation rotation angle is used. While an optical device using a zoom lens and an ENG camera is used, it is necessary to focus quickly when the subject is moving at high speed or when it is out of focus. An ENG zoom lens and an optical device using an ENG camera that control the focus by a control signal proportional to the above are used.

Next, FIG. 6 shows a top view of the zoom lens for the ENG camera in the above-described conventional example, and FIG. 7 shows a side view of the side.
As shown in FIGS. 6 and 7, reference numeral 100 denotes a lens barrel. Although not shown, a fixed focus lens, a moving focus lens, a zoom lens, an iris mechanism, a relay lens, and an extender are arranged therein. Yes. Reference numeral 101 denotes a focus electronic ring that adjusts the focus by moving the moving focus lens back and forth along the optical axis by rotating.
Reference numeral 102 denotes a zoom ring that performs zoom adjustment by rotating the zoom lens back and forth along the optical axis, and reference numeral 103 denotes an iris ring that adjusts the iris aperture diameter by rotating.
104 is attached to the lens barrel of the ENG zoom lens, and the motor for driving the zoom, focus, and iris, the position detector, the control circuit, the zoom, and the iris are driven electrically or manually. It is a drive unit that houses clutches, switches, etc. for switching.
Reference numeral 105 denotes a zoom switch for controlling the zoom when it is driven electrically. Reference numeral 106 denotes an iris electric / manual switching switch for switching whether the iris is driven electrically or manually.
Reference numeral 107 denotes an electric interface between the ENG lens and the ENG camera, and a camera cable is supplied from the ENG camera side with a command signal for driving the iris electrically. 108 is a zoom switch for driving the zoom electrically. This is a zoom switch speed variable volume that varies the zoom lens drive speed for an operation amount of 105.
Reference numeral 109 denotes a zoom clutch that switches whether the zoom is driven electrically or manually. Reference numeral 110 denotes a focus clutch that switches whether the focus is driven on demand or manually.

The operation of the focus electronic ring 101 and the focus clutch 110 when the focus is operated by the ENG zoom lens and the ENG camera in the above configuration will be described.
When the focus clutch 110 is on the demand side, the focus lens is controlled by a control signal proportional to the operation rotation angle of the focus demand.
When the focus clutch 110 is the manual side and the ENG zoom lens and the ENG camera are of a type that controls the focus lens by a control signal proportional to the focus operation rotation angle, it is proportional to the operation rotation angle of the focus electronic ring 101. The focus lens is controlled by the control signal.
When the focus clutch 110 is on the manual side and the ENG zoom lens and the ENG camera are of a type that controls the focus lens with a control signal proportional to the angular speed of the focus operation rotation angle, the operation rotation angle of the focus electronic ring 101 is The focus lens is controlled by a control signal proportional to the angular velocity of the lens.
Japanese Patent Laid-Open No. 10-126662 JP-A-11-103409

However, in the above-described conventional example, when the focus is manually operated, an optical device that is driven by a control signal proportional to the operation amount is used for a subject that moves at a high speed or at high speed. When it is necessary to focus quickly, the required rotation angle of the focus electronic ring increases, and depending on the situation, it is necessary to re-hold the hand that operates the focus electronic ring. As a result, there arises a problem that the video intended by the photographer cannot be obtained.
Similarly, in the case of an optical device that is driven by a control amount that is proportional to the amount of change in the operation amount when manually operating the focus, in the case of the above large blur or a subject that moves at high speed Although it is possible to solve the problem, there is a problem in dealing with a case where the absolute position of the graduation line deviates from the actual focus position and fine control of the focus is required.
Therefore, in the above-described conventional optical device, the focus control required when quickly following the subject and the focus control required when shooting by subtle control or checking the scale line are performed with one optical device. At the same time, it has a problem that it cannot be satisfied.

  Therefore, the present invention solves the above-mentioned problem, and when performing manual focus operation, shooting is performed by focus control required when the subject is largely blurred or when the subject is quickly followed, and by subtle control and checking of the scale line. An object of the present invention is to provide an optical device that can be switched between the focus control required for the operation.

The present invention provides an optical device configured as follows.
That is, the optical device of the present invention is provided with a focus ring for manually Therefore rotation, in an optical apparatus having a focus control means for controlling the focus lens by the rotation operation of the focus ring, a control switching for switching the control of the focus control means And a control switching means for driving the focus lens using a focus position command signal for instructing a drive direction and a drive position of the focus lens according to only an operation rotation angle of the focus ring ; Control of the focus control means to any one of control of driving the focus lens using a focus position command signal instructing a drive direction and a drive position of the focus lens according to only an operation rotation angular velocity of the focus ring. Features switching To have.
Further, the optical device of the present invention can be configured such that the control switching means is provided on either the lens side or the camera side.

  According to the present invention, when a manual focus operation is performed, when the switching means causes a large blur or a fast moving subject to be quickly followed, a control amount proportional to the amount of change in the operation amount. If you need subtle control, or if you want to shoot while checking the scale line, you can use the focus control with the control amount proportional to the operation amount, to report, relay, It is possible to realize an optical device that can perform a focus operation in accordance with shooting contents such as drama, variety, documentary, shooting location, shooting situation, and photographer's preference.

  The best mode for carrying out the present invention will be described by the following examples.

FIG. 1 shows the configuration of an optical apparatus according to an embodiment of the present invention.
As will be described below, the optical apparatus of the present embodiment includes a zoom lens, a focus lens, and an iris mechanism, and the zoom lens is configured to be controlled by operating the zoom lens driving means by the zoom operation means. In addition, the focus lens is configured to be controlled by operating the focus lens driving means by the focus operation means. Further, the iris mechanism includes iris drive switching means for switching the iris mechanism between electric drive and manual drive.

A specific configuration of the optical apparatus of the present embodiment will be described with reference to FIG. 1. In FIG. 1, reference numeral 1 denotes a zoom drive direction proportional to an operation amount of the zoom switch 105 in order to electrically drive a zoom lens optical system 9 to be described later. Zoom speed command signal generating means for detecting a zoom speed command signal for instructing a zoom drive speed.
The zoom speed command signal generating means 1 includes a potentiometer, an analog detector such as a volume, a digital detector such as a rotary encoder, and the like.
Reference numeral 2 denotes a zoom speed command signal calculation means for performing signal level conversion / signal shift conversion in order to capture the zoom speed command signal into an A / D conversion means 3 described later. Reference numeral 3 denotes an analog signal output from the zoom speed command signal calculation means 2. Is an A / D conversion means for converting the signal into a digital signal.
4 is a CPU that controls the operation of each function, 5 is a D / A conversion means for converting a zoom control signal output from the CPU 4 to electrically drive a zoom lens optical system 9 to be described later from a digital signal to an analog signal, and 6 is a D / A converter. Zoom control signal calculation means for performing signal level conversion / signal shift conversion of the zoom control signal output from the / A conversion means 5.
7 is a zoom power amplifying means for driving a zoom motor 8 to be described later, 8 is a zoom motor for driving a zoom lens optical system 9 to be described later, 9 is a zoom lens optical system for adjusting the magnification of the optical device, and 10 is zoom lens optics. Zoom position signal detection means for outputting a zoom position signal corresponding to the position of the system 9.
Reference numeral 11 denotes a zoom position signal calculation means for performing signal level conversion / signal shift conversion in order to capture the zoom position signal into an A / D conversion means 12 described later. Reference numeral 12 denotes an analog signal output from the zoom position signal calculation means 11 as a digital signal. A / D conversion means for converting to.

Reference numeral 13 denotes a focus electronic ring counter that detects a focus drive position signal proportional to the operation rotation angle of the focus electronic ring 101. A focus demand unit 14 is connected to the TV lens shown in FIGS. 7 and 8 and controls the focus. A focus demand counter 15 detects a focus drive position signal proportional to the operation rotation angle of the focus demand unit 14. The focus demand counter 15 includes a potentiometer, an analog detector such as a volume, a digital detector such as a rotary encoder, and the like.
Reference numeral 16 denotes a D / A conversion means for converting a focus control signal output from the CPU 4 to electrically drive a focus lens optical system 20 to be described later from a digital signal to an analog signal. Reference numeral 17 denotes a focus output from the D / A conversion means 16. Focus control signal computing means for performing signal level conversion / signal shift conversion of the control signal.
Reference numeral 18 denotes a focus power amplifying means for driving a focus motor 19 to be described later, 19 is a focus motor for driving a focus lens optical system 20 to be described later, 20 is a focus lens optical system for adjusting the focus of the optical device, and 21 is a focus lens optical system. Focus position signal detection means for outputting a focus position signal corresponding to the position of 20.
Reference numeral 22 denotes a focus position signal calculation means for performing signal level conversion / signal shift conversion in order to capture the focus position signal into an A / D conversion means 23 described later. Reference numeral 23 denotes an analog signal output from the focus position signal calculation means 22 as a digital signal. A / D conversion means for converting to.

Reference numeral 24 denotes D / A conversion means for converting an iris control signal output from the CPU 4 to electrically drive an iris mechanism 28 (to be described later) from a digital signal to an analog signal. Reference numeral 25 denotes an iris control signal calculation means for performing signal level conversion / signal shift conversion of an iris control signal output from the D / A conversion means 24, and 26 denotes an iris power amplification means for driving an iris motor 27 described later.
Reference numeral 27 denotes an iris motor that drives an iris mechanism 28, which will be described later. Reference numeral 28 denotes an iris mechanism that adjusts the amount of light of the optical device. Reference numeral 29 denotes an iris position signal detection unit that outputs an iris position signal corresponding to the position of the iris mechanism 28.
Reference numeral 30 denotes an iris position signal calculation means for performing signal level conversion / signal shift conversion in order to capture the iris position signal into an A / D conversion means 33 described later. Reference numeral 31 denotes an analog signal output from the iris position signal calculation means 30 as a digital signal. A / D conversion means for converting to.
Reference numeral 32 denotes a zoom switch speed variable volume position signal calculating means for performing signal level conversion / signal shift conversion in order to capture the zoom switch speed variable volume position signal into an A / D conversion means 33 described later. Reference numeral 33 denotes a zoom switch speed variable volume position signal. A / D conversion means for converting an analog signal output from the calculation means 32 into a digital signal.

34 in accordance with the rotation angle of the focus electron ring, focus electron ring counter 13 corresponding only to the reading of pulses delivered from the (proportional) or perform the constant speed process that is driven by the control amount, the focus electron ring counter 13 Focus constant speed / acceleration processing switching means for switching whether to perform acceleration processing driven by a control amount corresponding to (proportional to) only the amount of change in the read value of the pulse transmitted from the.

Reference numeral 35 denotes a camera iris position command signal calculation means for performing signal level conversion / signal shift conversion in order to take in a camera iris position command signal (ICS) input from the camera device to the optical device into an A / D conversion means 36 described later. , 36 are A / D conversion means for converting an analog signal output from the camera iris position command signal calculation means 35 into a digital signal.
105 is a zoom switch that controls when the zoom is electrically driven, 106 is an iris electric / manual switching switch that switches whether the iris is electrically driven or manually driven, and 108 is a zoom electrically driven In this case, the zoom switch speed variable volume is used to vary the zoom lens driving speed with respect to the operation amount of the zoom switch 105. The zoom switch speed variable volume 108 includes a potentiometer, an analog detector such as a volume, a digital detector such as a rotary encoder, and the like.
A zoom clutch 109 switches whether the zoom is driven electrically or manually. A focus clutch 110 switches whether the focus is driven on demand or manually.

In the above configuration, the control when the focus lens optical system 20 is first driven will be described.
When the focus clutch 110 is manually side a and the focus constant speed / acceleration process switching means 34 of constant velocity side, corresponding only to the rotation angle of that by the operation of the focus electron ring 101 off Okasu electron ring 101, focus the electron A driving position (driving amount) proportional to the read value of the pulse sent from the ring counter 13 and a focus position command signal for instructing the driving direction are input to the CPU 4. The CPU 4 calculates a focus control signal in accordance with the focus position command signal, and controls the focus motor 19 by the focus power amplification means 18 via the D / A conversion means 16 and the focus control signal calculation means 17, and the focus lens optics. System 20 is driven.
When the focus clutch 110 is manually side a and the focus constant speed / acceleration process switching means 34 of the acceleration side, corresponding only to the rotational angular velocity of the full Okasu electron ring 101 that by the operation of the focus electron ring 101, the focus electron ring A driving position (driving amount) proportional to the read value of the pulse sent from the counter 13 and a focus position command signal for instructing the driving direction are input to the CPU 4. The CPU 4 calculates a focus control signal in accordance with the focus position command signal, and controls the focus motor 19 by the focus power amplification means 18 via the D / A conversion means 16 and the focus control signal calculation means 17, and the focus lens optics. System 20 is driven.
In this case, even if the focus demand unit 14 is operated, the focus optical system 20 is not electrically driven. When the focus clutch 110 is on the demand side, the focus demand unit 14 is operated to drive the focus electrically. In this case, a focus position command signal instructing a driving direction and a driving position proportional to the operation amount of the focus demand unit 14 is input to the CPU 4. The CPU 4 calculates a focus control signal in accordance with the focus position command signal, and controls the focus motor 19 by the focus power amplification means 18 via the D / A conversion means 16 and the focus control signal calculation means 17, and the focus lens optics. System 20 is driven.

Next, control characteristics when driving the focus lens optical system 20 will be described with reference to FIGS.
FIG. 2 shows the focus demand unit 14 when the focus demand unit 14 is operated when the focus clutch 110 is on the focus demand side, or when the focus clutch 110 is on the manual side and the focus constant speed / acceleration switching means is on the constant speed side. FIG. 6 is a diagram showing a relationship between a focus target position and an operation rotation angle of the focus electronic ring 101.
In the figure, the horizontal axis represents the operation rotation angle θ ′ [rad] of the focus demand unit 14 or the operation rotation angle θ [rad] of the focus electronic ring 101, and the vertical axis represents the focus position [mm].
Further, FP _n is the focus position at the NEAR end, FP _f is the focus position at the FAR end, θ _n is the rotation angle at the NEAR end of the focus demand unit 14 or the focus electronic ring 101, and θ _f is the focus demand unit 14 or the focus electron. The rotation angle at the FAR end of the ring 101, θ ₀ is the rotation angle before the operation of the focus demand unit 14 or the focus electronic ring 101, and θ ₁ is the rotation angle after the operation of the focus demand unit 14 or the focus electronic ring 101.
FP ₀ is a focus position at the focus angle at the rotation angle θ ₀ , and FP ₁ is a focus position at the focus angle at the rotation angle θ ₁ .

と表され、Ｋ_ｎはフォーカス位置の操作回転角特性における比例定数の一般値で、

と表さる。式（２）を用いて、フォーカスデマンド部１４の操作回転角θ’、またはフォーカス電子リング１０１の操作回転角θに対するフォーカス目標位置ＦＰの関係は

と表される。
式（３−１），（３−２）のように、フォーカスクラッチ１１０がフォーカスデマンド側の場合にフォーカスデマンド部１４を操作した場合、またはフォーカスクラッチ１１０が手動側でフォーカス等速度／加速度切り換え手段が等速度側の場合において、フォーカスデマンド部１４の操作回転角、またはフォーカス電子リング１０１の操作回転角に対するフォーカス目標位置の関係は、比例定数をＫ_ｎ（ｎ＝１，２，３，…）に固定した比例関係によって制御される。 K ₁ is the minimum value of the proportionality constant in the operation rotation angle θ or θ ′ characteristic of the focus position FP,

K _n is a general value of a proportionality constant in the operation rotation angle characteristic of the focus position,

It is expressed. Using equation (2), the relationship of the focus target position FP with respect to the operation rotation angle θ ′ of the focus demand unit 14 or the operation rotation angle θ of the focus electronic ring 101 is

It is expressed.
Focus constant speed / acceleration switching means when the focus demand unit 14 is operated when the focus clutch 110 is on the focus demand side as in the expressions (3-1) and (3-2), or when the focus clutch 110 is on the manual side Is the constant velocity side, the relationship of the focus target position with respect to the operation rotation angle of the focus demand section 14 or the operation rotation angle of the focus electronic ring 101 is a proportional constant K _n (n = 1, 2, 3,...) It is controlled by a fixed proportional relationship.

と表され、これらを用いて、フォーカス回転角速度（ｄθ／ｄｔ）［ｒａｄ／ｓｅｃ．］に対するフォーカス移動量ＦＤ［ｍｍ］の関係は、

と表される。式（５−１），（５−２），（５−３）のように、フォーカスクラッチ１１０が手動側でフォーカス等速度／加速度切り換え手段が加速度側の場合において、フォーカス電子リング１０１の操作回転角速度（ｄθ／ｄｔ）［ｒａｄ／ｓｅｃ．］に対するフォーカス移動量ＦＤ［ｍｍ］の関係は、一定の範囲

において、比例定数をＫ_Ｍとした比例関係によって制御される。 FIG. 3 shows the operation rotation angular velocity (dθ / dt) [rad / sec.] Of the focus electronic ring 101 when the focus clutch 110 is on the manual side and the focus constant speed / acceleration switching means is on the acceleration side. ] Represents the relationship of the focus movement amount FD [mm] with respect to the operation rotation angular velocity (dθ / dt) [rad / sec. ], The vertical axis represents the focus movement amount FD [mm].
In addition, (dθ / dt) _MAX [rad / sec. ] Is the maximum angular velocity that can be followed,
FD _MAX [mm] is the maximum movement amount, (dθ / dt) ₁ [rad / sec. ] Is an arbitrary focus operation rotation angular velocity, FD ₁ [mm] is a focus operation rotation angular velocity (dθ / dt) ₁ [rad / sec. Focus movement amount in], _{K M} focus rotational angular velocity (dθ / dt) [rad / sec. ] Is a proportional constant of the focus movement amount FD [mm] characteristic with respect to

Using these, the focus rotation angular velocity (dθ / dt) [rad / sec. ] For the focus movement amount FD [mm]

It is expressed. As shown in the equations (5-1), (5-2), and (5-3), when the focus clutch 110 is on the manual side and the focus constant speed / acceleration switching means is on the acceleration side, the operation rotation of the focus electronic ring 101 is performed. Angular velocity (dθ / dt) [rad / sec. ] Of the focus movement amount FD [mm] to a certain range

In, is controlled by a proportional relationship proportional constant was K _M.

より算出（ステップ１０４）する。次に算出されたフォーカス位置ＦＰ_０、フォーカス目標位置ＦＰ_１、フォーカス制御信号算出比例定数Ｋ_ｓを用いて、フォーカス制御信号ＦＯを

より算出（ステップ１０５）する。次に算出されたＦＯを用いて、Ｄ／Ａ変換手段１６にフォーカス制御信号ＦＯを出力して、前述した現在位置検出処理へ戻る。 The processing of the CPU 4 at this time will be described with reference to FIGS.
FIG. 4 is a flowchart showing a processing procedure in the focus control process described above, from the start of the process to selection of each focus drive process, a control process at the time of driving by focus demand, and a manual control at a constant speed.
First, the focus position signal (current position) FP ₀ is input from the A / D conversion means 23 to the CPU 4 (step 101), and it is determined whether or not the focus clutch 110 is switched to the demand side (step 102). Focus clutch 1
When 10 is on the demand side, the rotation angle θ ′ is calculated from the reading value of the focus demand counter 15 (step 103), and the focus target position FP ₁ is determined from the relationship of the equation (3-2).

(Step 104). Next, using the calculated focus position FP ₀ , focus target position FP ₁ , and focus control signal calculation proportional constant K _s , the focus control signal FO is

(Step 105). Next, using the calculated FO, the focus control signal FO is output to the D / A conversion means 16, and the process returns to the current position detection process described above.

より算出（ステップ１０９）する。次に、算出されたフォーカス目標位置ＦＰ_１を用いて、前述したフォーカス制御信号ＦＯの算出処理（ステップ１０５）へ進み、以降前記同様の処理を行う。
フォーカス等速度／加速度処理切り換え手段３４が等速度側に切り換えられているか否かを判断（ステップ１０７）し、フォーカス等速度／加速度処理切り換え手段３４が等速度側に切り換えられていない場合には、図５に示す加速度処理へ
進む。 When it is determined whether or not the focus clutch 110 is switched to the demand side (step 102), if the focus clutch 110 is not the demand side, the focus constant speed / acceleration processing switching means 34 switches to the constant speed side. Is determined (step 107), and when the focus constant speed / acceleration processing switching means 34 is switched to the constant speed side, the rotation angle θ is calculated from the read value of the focus electronic ring counter 13 ( Step 108) and the focus target position FP ₁ is determined from the relationship of the expression (3-1).

(Step 109). Next, using the focus target position FP ₁ calculated, the process proceeds to calculation of the focus control signal FO described above (step 105), it performs the same processing thereafter.
It is determined whether or not the focus constant speed / acceleration processing switching means 34 has been switched to the constant speed side (step 107), and if the focus constant speed / acceleration processing switching means 34 has not been switched to the constant speed side, The process proceeds to the acceleration process shown in FIG.

が成り立つか否かを判別（ステップ１１１）し、式（９）が成り立つ場合には、算出された回転角速度（ｄθ／ｄｔ）₁、式（５−２）を用いて、フォーカス移動量ＦＤ_１を

より算出（ステップ１１２）する。
一方、上記ステップ１１１において、式（９）が成り立つか否かを判別した際に、式（９）が成り立たない場合には、算出された（ｄθ／ｄｔ）₁を用いて、

が成り立つか否かを判断（ステップ１１３）することにより、フォーカス電子リング１０１がＮＥＡＲ側に操作されたか否かを判断し、フォーカス電子リング１０１がＮＥＡＲ側に操作された場合には、フォーカス移動量ＦＤ_１は式（５−１）を用いて、

により算出（ステップ１１４）する。
また、上記ステップ１１３でのフォーカス電子リング１０１がＮＥＡＲ側に操作されたか否かの判断において、フォーカス電子リング１０１がＮＥＡＲ側に操作されなかった場合には、フォーカス移動量ＦＤ_１は式（５−３）を用いて、

により算出（ステップ１１５）する。 FIG. 5 is a flowchart showing the acceleration process. _First , the rotational angular velocity (dθ / dt) ₁ is calculated from the reading value of the focus electronic ring counter 13 (step 110). Next, for the calculated (dθ / dt) ₁ ,

Is determined (step 111), and when the equation (9) is satisfied, the focus movement amount FD ₁ is calculated using the calculated rotational angular velocity (dθ / dt) ₁ and the equation (5-2). The

(Step 112).
On the other hand, when it is determined in the above step 111 whether or not the equation (9) holds, if the equation (9) does not hold, the calculated (dθ / dt) ₁ is used.

Is determined (step 113) to determine whether or not the focus electronic ring 101 has been operated to the NEAR side. When the focus electronic ring 101 has been operated to the NEAR side, the focus movement amount FD ₁ uses equation (5-1),

(Step 114).
Further, in the focus electron ring 101 is determined whether being operated on NEAR side in step 113, when the focus electron ring 101 is not operated in the NEAR side, the focus movement amount FD ₁ is the formula (5 3)

To calculate (step 115).

が成り立つか否か判別（ステップ１１６）し、式（１４）が成り立つ場合には、ＮＥＡＲ端位置ＦＰ_ｎ、算出されたフォーカス位置信号ＦＰ_０、フォーカス移動量ＦＤ_１を用いて、

が成り立つか否かを判別（ステップ１１７）することにより、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まるか否かを判断し、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まる場合には、フォーカス制御信号算出比例定数Ｋ_ｓ、算出されたフォーカス移動量ＦＤ_１を用いて、フォーカス制御信号ＦＯを

により算出（ステップ１１８）する。
一方、ステップ１１７での式（１５）が成り立つか否かの判別において、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まるか否かを判断し、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まらない場合には、フォ
ーカス制御信号算出比例定数Ｋ_ｓ、フォーカスＮＥＡＲ端位置ＦＰ_ｎ、算出されたフォーカス移動量ＦＤ_１を用いて、フォーカス制御信号ＦＯを

より算出（ステップ１１９）する。 Next, using FD ₁ calculated in steps 112, 114 and 115,

Is satisfied (step 116), and if the equation (14) is satisfied, the NEAR end position FP _n , the calculated focus position signal FP ₀ , and the focus movement amount FD ₁ are used.

By determination (step 117) whether the holds, when you move the focus by the focus movement amount FD ₁ calculated focus moving the focus is determined whether falls within the movement range, the calculated when you move the amount FD ₁ focus when the focus is within range of movement, the focus control signal calculated proportionality constant K _s, the focus movement amount FD ₁ calculated using the focus control signal FO

To calculate (step 118).
On the other hand, in the judgment formula (15) is whether established in step 117, when moving the focus by the focus movement amount FD ₁ calculated, it is determined whether the focus is within the movement range, calculates when you move the focus by the focus movement amount FD ₁ that is, when the focus is not within range of movement, the focus control signal calculated proportionality constant K _s, focus NEAR end position FP _n, calculated focus movement amount FD ₁ is used to set the focus control signal FO

(Step 119).

が成り立つか否かを判別（ステップ１２０）することにより、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まるか否かを判断し、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まる場合には、フォーカス制御信号算出比例定数Ｋ_ｓ、算出されたフォーカス移動量ＦＤ_１を用いて、フォーカス制御信号ＦＯを式（１６）により算出（ステップ１２１）する。
一方、上記ステップ１２０での式（１８）が成り立つか否かの判別において、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まるか否かを判断し、算出されたフォーカス移動量ＦＤ_１だけフォーカスを移動した場合に、フォーカスが移動範囲内に収まらない場合には、フォーカス制御信号算出比例定数Ｋ_ｓ、フォーカスＦＡＲ端位置ＦＰ_ｆ、算出されたフォーカス移動量ＦＤ_１を用いて、フォーカス制御信号ＦＯを

より算出（ステップ１２２）する。
ステップ１１８，１１９，１２１，１２２の次に、前述したステップ１０６へ進み、以降、同様の処理を行う。 If it is determined in the above step 116 whether or not the equation (14) holds, if the equation (14) does not hold, the FAR end position FP _f , the calculated focus position signal FP ₀ , the focus movement amount With FD ₁ ,

By determination (step 120) whether the holds, when you move the focus by the focus movement amount FD ₁ calculated focus moving the focus is determined whether falls within the movement range, the calculated when you move the amount FD ₁ focus when the focus is within range of movement, the focus control signal calculated proportionality constant K _s, with a focus movement amount FD ₁ calculated focus control signal FO formula ( 16) (step 121).
On the other hand, in determining whether or not the equation (18) in step 120 is satisfied, it is determined whether or not the focus is within the movement range when the focus is moved by the calculated focus movement amount FD ₁ . When the focus is moved by the calculated focus movement amount FD ₁ and the focus does not fall within the movement range, the focus control signal calculation proportionality constant K _s , the focus FAR end position FP _f , and the calculated focus movement amount Using FD ₁ , the focus control signal FO is

(Step 122).
After steps 118, 119, 121, and 122, the process proceeds to step 106 described above, and thereafter the same processing is performed.

As described above, the zoom lens, the optical device having the focus lens and the iris mechanism, the zoom lens, the focus lens, the driving means installed in the iris mechanism, and controlling the driving means of the zoom lens An optical apparatus having zoom operation means for operating a zoom lens, focus operation means for operating the focus lens by controlling the drive means for the focus lens, and iris drive switching means for switching the iris mechanism between electric drive and manual drive In
When the focus operation means is operated, the rotation angle θ is calculated from the read value of the focus electronic ring counter 13 and the focus control signal is calculated, or the rotation angular velocity dθ / dt is calculated from the read value of the focus electronic ring counter 13. By providing focus constant speed / acceleration processing switching means 34 for switching between calculating and calculating the focus control signal,
When fine control of the focus is required or when the focus operation is performed while checking the focus graduation line, the focus operation rotation is performed by switching the focus constant speed / acceleration processing switching means 34 to the constant speed side. The focus lens is controlled by a control signal proportional to the angle θ, and when the subject is moving at a high speed or in a large blur, it is necessary to quickly follow the focus. By switching the switching means 34 to the acceleration side, the focus can be controlled by a control signal proportional to the angular velocity dθ / dt of the focus operation rotation angle. As a result, it is possible to control the focus instantly without changing the ENG camera and ENG zoom lens according to the shooting content, shooting location, shooting situation, photographer's preference, etc., such as news reports, broadcast, drama, variety, documentary, etc. Can be switched.
In this embodiment, the focus constant speed / acceleration switching means 34 is provided in the drive unit 104 of the ENG zoom lens. However, the focus constant speed / acceleration switching means 34 is not provided by providing it on the ENG camera side. A similar function may be realized in the zoom lens.

It is a block diagram which shows the structure of the optical apparatus in the Example of this invention. It is a figure which shows the focus constant speed control characteristic of the Example in this invention. It is a figure which shows the focus acceleration control characteristic of the Example in this invention. It is a figure which shows the focus equal speed control sequence of the Example in this invention. It is a figure which shows the focus acceleration control sequence of the Example in this invention. It is a figure which shows the upper surface external view of the zoom lens for ENG cameras in a prior art example. It is a figure which shows the side external view of the zoom lens for ENG cameras in a prior art example.

Explanation of symbols

1: Zoom speed command signal generation means 2: Zoom speed command signal calculation means 3, 12, 23, 31, 33, 36: A / D conversion means 4: CPU
5, 16, 24: D / A conversion means 6: Zoom control signal calculation means 7: Zoom power amplification means 8: Zoom motor 9: Zoom lens optical system 10: Zoom position signal detection means 11: Zoom position signal calculation means 13: Focus electronic ring counter 14: Focus demand unit 15: Focus demand counter 17: Focus control signal calculation means 18: Focus power amplification means 19: Focus motor 20: Focus lens optical system 21: Focus position signal detection means 22: Focus position signal calculation Means 25: Iris control signal calculation means 26: Iris power amplification means 27: Iris motor 28: Iris mechanism 29: Iris position signal detection means 30: Iris position signal calculation means 32: Zoom switch speed variable volume position signal calculation means 34: Focus Constant velocity / Acceleration switching means 35: camera iris position command signal calculation means 100: lens barrel 101: focus electronic ring 102: zoom ring 103: iris ring 104: drive unit 105: zoom switch 106: iris electric / manual changeover switch 107: camera cable 108: Zoom switch speed variable volume 109: Zoom clutch 110: Focus clutch

Claims (2)

Comprising a focus ring for manually Therefore rotation, in an optical apparatus having a focus control means for controlling the focus lens by the rotation operation of the focus ring,
Control switching means for switching the control of the focus control means,
The control switching means is
Control for driving the focus lens using a focus position command signal for instructing a drive direction and a drive position of the focus lens according to only an operation rotation angle of the focus ring ;
Control for driving the focus lens using a focus position command signal for instructing a driving direction and a driving position of the focus lens according to only an operation rotation angular velocity of the focus ring ;
An optical device characterized in that the control of the focus control means is switched to any one of the above.   The optical apparatus according to claim 1, wherein the control switching unit is provided on either the lens side or the camera side.

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