JP2014202868A - Lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a lens device that is appropriate for preventing a focus wrong operation upon an autofocus operation while establishing conventional operability in a television lens of a single shaft dual operation method having an autofocus function.SOLUTION: A lens device has: a focus optical system; a lens barrel that contains a zoom optical system; a focus optical system; autofocus focus detection means; manual focus operation means; control means that controls a drive of the focus optical system in accordance with a focus instruction signal of the autofocus focus detection means and the manual focus operation means; and focus operation sensitivity changing means that is composed of focus operation change-over means for changing over a control between an autofocus drive and a manual focus drive, and when a state is such that an input signal from the focus operation change-over means is set to the autofocus drive, changes a movement amount of the focus optical system with respect to an operation amount of the manual focus operation means.

Description

  The present invention relates to an autofocus system for a broadcast television lens capable of focusing operation by autofocus control.

  The optical system of the lens device used for TV shooting is usually imaged from the object side to the front lens focus lens group, the front zoom lens group, the rear zoom lens group, and the image output surface of the TV camera. It consists of a lens group.

  In recent years, with the spread of high-definition (HD) cameras, television lenses with higher resolution and shallower depth of field have been frequently used. For such a lens having a shallow depth of field, for example, a lens for television photography that includes a focus position detection unit and can perform an in-focus operation by autofocus as shown in Patent Document 1 has become widespread.

  By the way, there are lens operation modes suitable for various shooting situations in television shooting lenses. For example, as shown in Patent Document 2, a zoom operation is performed in conjunction with a push-pull operation of one operation rod, and a focus operation is performed in conjunction with a rotation operation of a rotary knob provided at the tip of the operation rod. There is an operation method. In Japan, it is often used for shooting where zoom operations are frequently performed because of its good responsiveness to changes in the angle of view with respect to zoom operations and ease of sensory operations for zooming in / out. In addition, the single-axis two-operation method allows the focus operation and zoom operation to be performed with one hand and the pan / tilt operation to be performed independently with the other hand. It becomes.

  The driving method in the uniaxial two-operation method having such an advantage includes a manual method that is mechanically coupled to a moving lens group in the lens device and a focus / zoom as disclosed in Patent Document 3, for example. There is a servo system in which the operation amount is detected and the moving lens group is driven by servo control in accordance with the operation amount. In recent years, as shown in Patent Document 4, for example, it has a switching mechanism between a manual method and a servo method operated via a focus operation unit and a zoom operation unit so that the operation method can be selected according to the situation. Hybrid type lens devices have been proposed. More recently, with the widespread use of high-definition (HD) lenses, for example, as disclosed in Patent Document 5, a single-axis two-operation type lens apparatus equipped with an autofocus function has been proposed. Thus, it is possible to concentrate on only the zoom operation without worrying about the focus state in the focus operation, and it is possible to perform high-quality shooting in a focused state even with a faster and more accurate zoom operation.

JP 2002-365517 A JP-A-6-217177 Special Registration No. 3298963 Specification Japanese Patent Laid-Open No. 2004-325639 JP 2006-251680 A

  However, when the autofocus operation is performed by the above-described single-axis two-operation method, the following problems have occurred.

  Photographers who handle TV lenses may not only focus on the subject but also intentionally blur the focus as a video effect, or use manual and autofocus in combination with various shooting conditions. Especially for TV broadcast photographers who use high-definition (HD) lenses with high resolution, manual operation that can be operated at will is indispensable for shooting even if the autofocus function is enhanced. . For example, in the one-axis two-operation method, when the operator rotates the rotary knob of the operation rod during the autofocus operation, manual focus drive can be performed with priority on manual operation.

  When the manual operation is stopped, the autofocus operation is resumed. However, in the case of the single-axis two-operation method, if the zoom operation is performed during the autofocus operation, the operator may not only push and pull the operation rod but also unintentionally rotate the rotary knob. Particularly in a situation where a fast zoom operation is required, the rotation angle may become large depending on the movement of the operator's hand and arm. When this happens, the lens recognizes that an unintended rotation operation has been performed by manual focus operation, and switches to manual connection or manual focus operation by a servo method, and a moving lens group with a movement amount corresponding to the rotation angle. Move.

  Then, the subject that has been focused by autofocus until now is out of focus due to manual operation, and the quality of the captured image is degraded. As a countermeasure, if the lens movement amount relative to the operation amount of the rotary knob, that is, the operation sensitivity of the focal position movement is set to be dull, the influence is reduced because there is little focus movement even if operated. On the other hand, when manual operation is performed when autofocusing is not performed, fast focus movement cannot be performed, and responsiveness is impaired.

  A lens having an autofocus function is provided with an auto / manual switch, a setting switch for moving the focusing range, and the like. However, in the case of the single-axis two-operation method, when operating the operating rod and the rotary knob, the hands cannot be released from the rotary knob. Therefore, the AF-related switch is inevitably disposed at the center or the periphery of the rotary knob, but there is a possibility that the operation rod may be pushed and pulled or accidentally pushed by the rotation of the rotary knob.

  Accordingly, an exemplary object of the present invention is to provide an appropriate configuration for preventing a focus malfunction during an autofocus operation while establishing conventional operability in a uniaxial two-operation television lens having an autofocus function. It is in providing a lens apparatus.

  In order to solve the above problems, a lens apparatus according to the present invention includes a focus optical system, a lens barrel containing a zoom optical system, a focus optical system, a focus detection means for autofocus, a manual focus operation means, and an autofocus. Focus control means for controlling the drive of the focus optical system according to the focus command signal of the focus detection means for manual use or the manual focus operation means, and the focus operation switching means for switching the control of the auto focus drive and the manual focus drive. When the input signal from the switching means is set to autofocus driving, the apparatus has a focus operation sensitivity changing means for changing the movement amount of the focus optical system with respect to the operation amount of the manual focus operation means.

  Further objects and other features of the present invention will be made clear by the preferred embodiments described below with reference to the accompanying drawings.

  According to the present invention, in a television lens of a uniaxial two-operation system having an autofocus function, it is possible to prevent an influence such as out-of-focus due to an unintentional focus operation during an autofocus operation.

  Further, by changing the operation setting of the focus operation with or without the zoom operation during the autofocus operation from that during the manual operation, it is possible to prevent a focus malfunction due to the zoom operation.

  Further, by configuring the AF-related setting switch in the operation unit that performs the pan / tilt operation instead of the operation unit side that performs the biaxial operation, it is possible to prevent a focus malfunction during the zoom / focus operation.

It is a schematic diagram showing the outline of the composition concerning the claim of the present invention. It is a schematic diagram showing the outline of the composition concerning the claim of the present invention. It is the schematic diagram showing the relational expression which concerns on the claim of this invention. 6 is a flowchart showing an operation outline of a configuration according to claims 1, 2, 3, and 8 of the present invention. 6 is a flowchart showing another operation outline of the configuration according to claims 1 and 2 of the present invention. 6 is a flowchart showing an operation outline of a configuration according to claim 4 of the present invention. 6 is a flowchart showing an operation outline of a configuration according to claim 5 of the present invention. 9 is a flowchart showing an operation outline of a configuration according to claim 6 of the present invention. 10 is a flowchart showing an operation outline of a configuration according to claim 7 of the present invention. 10 is a conversion table of the configuration according to claim 7 of the present invention. FIG. 10 is a schematic diagram showing an outline of a configuration according to claim 9 of the present invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[Example 1]
FIG. 1 is a schematic diagram showing an outline of a lens apparatus having the configuration of the present invention.

  The lens apparatus 100 is placed on the stage 1 on which the operation table 300 is movable together with the TV camera 200 via the fixed supporter 2. On the back side of the lens apparatus 100, an operation bar 3 for performing zoom operation and focus operation is provided. The operation rod 3 is installed so as to protrude from the rear side of the television camera 200 through the television camera 200, and has a rotation knob 4 at the tip. The operator performs a zoom operation by pushing and pulling the operation rod 3 and a focus operation by rotating the rotary knob 4. The TV camera 200 stage 1 is provided with a pan bar 5 for an operator to perform pan / tilt operation. An operation unit 400 for setting the operation of the lens device 100 is fixed near the tip of the pan bar 5. Yes. When the operator performs operation settings of the operation unit 400, a command signal corresponding to each setting is transmitted to the control unit included in the lens apparatus 100, and each operation is performed. In addition, a monitor 6 is placed on the rear upper surface of the TV camera 200, and the operator can confirm the desired amount of change in the angle of view and the in-focus state on the monitor 6 while operating the operation bar 3 and the operation amount of the rotary knob 4. Adjust.

  A rotatable roller 6 is provided on the bottom surface of the operation table 300, and the operation table 300 can be freely moved on the floor surface. Further, the support column 7 of the operation table 300 can be moved up and down even when a load is applied from the upper surface stage 1 by air pressure or elastic force such as a spring. Further, the stage 1 has an angle in the pan / tilt direction with respect to the support column 7. Can be changed. With such a mechanism, the operator can pan, tilt, move up and down, and move the lens device 100 and the TV camera 200 horizontally, and can shoot from various viewpoints with respect to the shooting target.

  FIG. 2 is a schematic diagram showing the internal configuration of the lens apparatus 100 and the configuration of related peripheral units. The same parts as those described above are denoted by the same reference numerals.

  The lens housing 100 includes a focus lens group 9, a zoom lens group 10, a prism 11 for splitting light rays, and a relay lens group 12 for forming an image on the imaging surface of the CCD 8 housed in the housing of the TV camera 200. ing. The focus lens group 9 is a lens group whose imaging position is variable, and the zoom lens group 10 is a lens group whose variable focal length is variable. The light that has passed through these lens groups is distributed to two lights by the prism 11. The first light passes through the prism 11 and reaches the CCD 8 via the relay lens group 12. On the other hand, the second light is reflected by the prism 11 and reaches the detection sensor 14 that detects the focus state via the detection lens group 13. The detection sensor 14 is a sensor of a phase difference detection method that is a conventionally known technique, and inputs two light beams that are symmetric with respect to the optical axis to a plurality of photoelectric conversion elements, and corresponds to the respective light amounts obtained from the pixels. Generate electrical signals. The focus lens group 9 is driven in the optical axis direction by a motor 15 via a screw feed mechanism (not shown) such as a helicoid. The focus lens group 9 is provided with a focus position sensor 16 for measuring an absolute position. A clutch 17 is connected between the focus lens group 9 and the motor 15, and the driving force is connected and disconnected according to the manual operation and the servo operation.

  The zoom lens group 10 has a variator (left side) and a compensator (right side) lens group driven in the optical axis direction by a motor 18 via a cam shaft (not shown). A zoom position sensor 19 is provided for measuring the absolute position. A clutch 20 is connected between the zoom lens group 10 and the motor 18, and the driving force is connected and disconnected according to a manual operation and a servo operation.

  In the lens apparatus 100, a diaphragm 21 for changing the F number is provided between the zoom lens group 10 and the prism 11.

  The electrical signal obtained by the detection sensor 14 is input to the lens CPU 23 through the A / D converter 22. The focus position sensor 16 converts the position of the focus lens group 9 in the optical axis direction into a voltage, and the obtained voltage value is then converted into a digital signal by the A / D converter 22 and input to the lens CPU 23. The zoom position sensor 19 converts the position of the zoom lens group 10 in the optical axis direction into a voltage, and the obtained voltage value is then converted into a digital signal by the A / D converter 22 and input to the lens CPU 23.

  The servo changeover switch 24 is a changeover switch between a mode in which the focus lens group 9 and the zoom lens group 10 are driven by servo control and a mode in which the drive is performed manually. The AF changeover switch 25 is a changeover switch for selecting focus control by autofocus and focus control by manual focus when the focus drive is servo controlled.

  The focus operation amount sensor 26 converts the rotation amount of the rotary knob 4 operated during servo operation into voltage, and the obtained voltage value is then converted into a digital signal by the A / D converter 22 and input to the lens CPU 23. The Further, the zoom operation amount sensor 27 converts the amount of movement of the operation rod 3 pushed and pulled during servo operation into a voltage, and the obtained voltage value is then converted into a digital signal by the A / D converter 22, and is sent to the lens CPU 23. Entered.

  Sensitivity change knob 28 is a knob that changes the manual focus operation sensitivity during autofocus operation. The rotary position of the knob is converted to voltage, and the resulting voltage value is then converted to a digital signal by A / D converter 22. And input to the lens CPU 23.

  Here, the operation of the sensitivity changing knob 28 will be described.

FIG. 4 is a schematic diagram when the focus sensitivity is changed by the sensitivity change knob 28. The focus movement amount ΔF _m by which the focus lens group 9 is driven with respect to the output F _m of the focus operation amount sensor 26 by the operation of the rotary knob 4 is obtained by the following equation.

ΔF _m = k ₀ * F _m (1)
The output F _m is a counter value counted in a counter (not shown) after converting the output voltage from the focus operation amount sensor 26 into a digital signal via the A / D converter 22, and k ₀ is an output This is a calculation coefficient for converting from F _m to a focus movement amount ΔF _m . The expression (1) using the coefficient k ₀ is applied to the calculation of the focus operation when the autofocus operation is not performed.

On the other hand, the calculation of the focus movement amount ΔF _{m with} respect to the output F _m during the autofocus operation is obtained by the following equation.

ΔF _m = k ₁ * F _m (2)
k ₁ is an arithmetic coefficient for converting the output F _m during the autofocus operation into the focus movement amount ΔF _m and has a relationship of 0 ≦ k ₁ ≦ k ₀ . The value of the coefficient k ₁ can be changed by the sensitivity change knob 28, and the focus movement amount ΔF _m with respect to the output F _m changes with the upper limit at the time of manual focus as shown in (a) to (c) of FIG.

That is, the operator can arbitrarily change the focus operation sensitivity during the autofocus operation. For example, if the purpose of preventing a malfunction caused by an unintended focus operation during autofocus operation, set by the sensitivity change knob 28 so that the value of k ₁ of FIG. 4 (c), should lower the operating sensitivity. If focus operation even autofocus operation is required in the reverse set by the sensitivity change knob 28 so that the value of k ₁ of FIG. 4 (a), kept close to the operating sensitivity when no autofocus operation.

  The memory 29 is a recording unit that records the focus position calculated based on the detection value output from the detection sensor 14, and the lens CPU 23 controls temporary writing, reading, and erasing.

  The lens CPU 23 performs software processing from the input described above, and generates a focus control signal and a zoom control signal during servo operation. These control signals are converted into analog signals by the D / A converter 30, and the focus is converted by the motor 15 into driving force for driving the focus lens group 9 in a state where the clutch 17 is connected. The zoom is converted into a driving force for driving the zoom lens group 10 with the clutch 20 connected by the motor 18.

  On the other hand, during manual operation, the servo switch 24 is switched to the manual side. Then, the lens CPU 23 disconnects the clutch 17 and the clutch 20, and stops the lens driving by the input signals from the focus operation amount sensor 26 and the zoom operation amount 27. At the same time, the rotary knob 4 and the focus lens group 9, and the operation rod 3 and the zoom lens group 10 are mechanically connected by the connecting portion 31 and the connecting portion 32, and each lens group is driven according to each operation amount. When the servo operation is switched, the clutch 17 and the clutch 20 are connected, and at the same time, the connecting portion 31 and the connecting portion 32 are disconnected to perform the above servo control.

  Next, the operation when autofocus control is performed during servo operation will be described with reference to the flowchart of FIG.

  FIG. 4 shows an example of software processing performed by the CPU 23.

When the lens apparatus 100 is powered on, the lens CPU 23 proceeds to STEP 101 and initializes the registers, memories, etc. in the lens CPU 23. The process advances to STEP102, determines whether AF changeover switch 25 is turned ON, initialize the target focus position F _x as a target for controlling the focus of the current focus position F by being ON. If the AF selector switch 25 is not turned on, the operation of STEP102 is repeated.

When the AF switch 25 is turned on, the process proceeds to STEP 103, and the calculation formula for calculating the focus movement amount ΔF _m is changed from the formula (1) to the formula (2). The coefficient k _{1 in} the equation (2) has a set value determined by the sensitivity change knob 28 and is stored in the memory 29 as table data. Since the coefficient k _{0 in} the expression (1) and the coefficient k _{1 in} the expression (2) have a relationship of 0 ≦ k ₁ ≦ k ₀ , the focus operation sensitivity is lower than when the autofocus operation is not performed.

  Next, proceeding to STEP 104, the detection sensor 14 detects the focal length in order to perform focus driving by autofocus. The detection sensor 14 is a phase difference type sensor that performs photocharge accumulation and charge readout of a pair of light beams that are symmetrical with respect to the optical axis. Next, by performing known image interval detection processing in STEP 105, the phase difference amount X for calculating the defocus amount D is calculated from the image interval at the time of focusing and the current image interval. The defocus amount D is a distance from the imaging surface of the CCD 8 to the imaging surface, and is different from the mechanical movement amount of the focus lens group 9.

  Subsequently, the process proceeds to STEP 106 and STEP 107, and the focus position F and the zoom position Z are obtained from the focus position sensor 16 and the zoom position sensor 19, and the defocus amount D is obtained from the phase difference amount X and the focus position F and the zoom position Z in STEP 108. Obtained by the following formula.

D = k ₂ * (X−f ₁ (Z, F)) (3)
k ₂ is the calculation factor for converting the defocus amount from the phase difference amount, calculated as a fixed value. The function f ₁ () is a phase difference offset amount determined by the zoom position Z and the focus position F, and is stored in the memory 29 as table data. At STEP 109, the defocus amount D is converted into a mechanical focus lens group 9 movement amount. The focus movement amount ΔF _a is calculated using the following equation.

ΔF _a = k ₃ * D (4)
k ₃ is a calculation coefficient for converting a defocus amount, which is an optical focus movement amount, into a mechanical focus movement amount, and is stored in the memory 29 as table data. Next, the process proceeds to STEP 110, where a control signal for driving the focus lens group 9 is generated at the target focus position F _x1 calculated from the focus movement amount ΔF _a . In STEP 111, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x1 via the clutch 17.

The program then proceeds to STEP112, to obtain the output F _m of the operation amount of the rotation knob 4. Then determine the value of the output F _m in STEP113, when the output F _m is 0 returns to STEP 102, and repeats the above similar process. If the output F _m is a value on the + side or − side, the calculation of the above equation (2) is performed in the next STEP 114, and the focus movement amount ΔF _m is calculated from the output F _m .

The process advances to STEP115, where it generates a control signal for driving the focusing lens group 9 to the focus movement amount [Delta] F _m target focus position F _x2 calculated from. In STEP 116, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x2 via the clutch 17. And it returns to STEP102 again and repeats the same processing.

  As described above, since the operation sensitivity of the rotary knob 4 at the time of autofocus operation is set to be duller than that at the time of manual focus operation, it is possible to suppress the influence of defocus due to unintentional rotation. Therefore, the operator can concentrate on the zoom operation and the pan / tilt operation during autofocus.

  In STEP 104 to STEP 110, the target focus position Fx1 is calculated by the phase difference detection method. However, even with other focal length detection methods such as a contrast method, the target focus position can be calculated only by changing the principle and the process of calculating the focus movement amount. Therefore, if the flow from STEP 104 to STEP 110 is replaced with each method, the same effect can be obtained.

[Example 2]
Next, another operation when autofocus control is performed will be described with reference to the flowchart of FIG. Since the configuration is the same as that of the first embodiment, description thereof is omitted.

The operations from STEP 201 to STEP 205 are the same as the operations from STEP 101 to STEP 111 in FIG. That is, when the AF selector switch 25 is turned on after the initialization process, the conversion from the output F _m by the rotary knob 4 to the focus movement amount ΔF _m is changed from the expression (1) to the expression (2), and thereafter A series of autofocus processes are performed to determine and drive the target position F _x1 of the focus lens group 9.

Subsequently, the process proceeds to STEP 206, where the output F _m of the rotary knob 4 is acquired. Then determine the value of the output F _m in STEP207, when the output F _m is 0 returns to STEP 202, the same process is repeated. When the output F _m is a value on the + side or − side, the process proceeds to STEP 208, and the calculation of Expression (2) is performed to calculate the focus movement amount ΔF _m from the output F _m .

  Subsequently, the focus position F is acquired in STEP 209, and the zoom position Z acquired from the zoom position sensor 19 and the F-number set value I of the diaphragm 21 are acquired in STEP 210 and STEP 211. In STEP 212, the depth of field d is calculated from the data F, Z, and I acquired in STEP 209, STEP 210, and STEP 211. The depth of field d here is a distance in the front-rear direction from the position of the subject focused by the autofocus operation, and is an amount different from the mechanical movement amount of the focus lens group 9. The depth of field d is calculated by the following equation.

d = f ₂ (δ, F, Z, I) (5)
The function f ₂ () is a function determined by the focus position F, the zoom position Z, and the F number, and stores the depth of field d in the memory 29 as table data. δ is an allowable circle of confusion, and both f ₂ and δ are determined by the optical configuration of the focus lens group 9, the zoom lens group 10, the stop 21, and the relay lens group 12.

In the next STEP 213, the depth of field d is converted into an amount corresponding to the mechanical focus lens group 9 range. The focus movement amount ± F _d is calculated using the following equation.

± F _d = f ₃ (± d) (6)
The function f ₃ () depends on the depth of field d and is a coefficient for converting an optical focus movement amount into a corresponding mechanical focus movement amount, and is stored in the memory 29 as table data.

Next, in STEP 214, the focus movement amount ΔF _m and the focus movement amount ± F _d are compared. If the focus movement amount ΔF _m exceeds the focus movement amount ± F _d , it is determined that it is outside the depth of field, and the target focus calculated from the focus movement amount ΔF _m and the focus movement amount ± F _d in the next STEP 215. A control signal for driving the focus lens group 9 to the position F _x2 is generated. The target focus position F _x2 here is a position obtained by subtracting the focus movement amount ± F _d from the focus movement amount ΔF _m .

That is, since the amount of movement within the depth of field is subtracted from the amount of focus movement, the amount of movement is reduced. In STEP 216, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x2 via the clutch 17. Then, the process returns to STEP 202 and a series of operations are repeated. If the focus movement amount ΔF _m does not exceed the focus movement amount ± F _d , it is determined that it is within the depth of field and the process proceeds to the next STEP 217. In STEP 217, the focus lens group 9 is held at the focus position F. That is, in the case of the depth of field, a dead zone in which driving by the focus operation is not performed is performed, and the focal position is fixed. And it returns to STEP202 again and repeats the same processing.

  As described above, during autofocus operation, the amount of focus movement by operating the rotary knob 4 and the amount of movement within the depth of field are discriminated. When the depth is within the depth of focus, the focus is not driven. Since the moving amount is driven by the subtracted amount, the effect of preventing the focus malfunction is further enhanced.

[Example 3]
Next, an operation accompanied by a zoom operation by pushing and pulling the operation rod 3 in the case of auto focus control will be described with reference to the flowchart of FIG. Since the configuration is the same as that of the first embodiment, description thereof is omitted.

STEP 301 to STEP 305 are the same as STEP 101 to STEP 111 in FIG. That is, when the AF selector switch 25 is turned on after the initialization process, the conversion from the output F _m by the rotary knob 4 to the focus movement amount ΔF _m is changed from the expression (1) to the expression (2), and thereafter A series of autofocus processes are performed to determine and drive the target position F _x1 of the focus lens group 9.
The program then proceeds to STEP306, to obtain a zoom operation amount Z _m from the zoom position sensor.

Then determine the value of the zoom operation amount Z _m In STEP307, when the zoom operation amount Z _m is 0, it determined not to be the zoom operation, the process proceeds to STEP309 previous without using the STEP 308. When the zoom operation amount Z _m is a value on the + side or − side, the process proceeds to STEP 308, where the conversion formula using the output F _m and the second coefficient k ₄ is changed. The focus movement amount ΔF _{m (z)} after the change is calculated by the following equation.

ΔF _{m (z)} = k ₄ * F _m (7)
k ₄ is an arithmetic coefficient for converting the output F _m at the time of the autofocus operation into the focus movement amount ΔF _{m (z)} , and k _{1 in} the expression (2) has a relationship of 0 ≦ k ₄ ≦ k ₁ There is. Therefore, the coefficient is smaller than that of the equation (2), and the focus operation sensitivity is further decreased. Coefficient k ₄ is stored as table data in the memory 29. When the value of the coefficient k ₁ is changed by the sensitivity change knob 28, the value of the coefficient k ₄ is also changed in proportion.

The program then proceeds to STEP309, to obtain the output F _m of the rotary knob 4. Then determine the value of the output F _m in STEP310, when the output F _m is 0 returns to STEP 302, the same process is repeated. If the output F _m is a value on the + side or − side, the process proceeds to STEP 311. Here, if it is determined at STEP 307 that there is no zoom operation, the calculation of equation (2) is performed to calculate the focus movement amount ΔF _m . Conversely, if it is determined that there is a zoom operation, the calculation of the above equation (7) is performed to calculate the focus movement amount ΔF _{m (z)} . Then, the process proceeds to the next STEP312, where it generates a control signal for driving the target focus position F _x2 or target focus position F _x2 focus lens group 9 _(Z),. And it operates the motor 15 through the D / A converter 30 in STEP313, drives the focus lens group 9 via the clutch 17 target focus position F _x2, or the target focus position F _{x2 (Z).} And it returns to STEP302 again and repeats the same process.

  As described above, when there is a zoom operation during autofocus, the focus operation sensitivity is set to be duller.Therefore, the effect of defocusing caused by unintentional rotation during zoom operation is further affected than when there is no zoom operation. It becomes possible to prevent. Therefore, the operator can concentrate on the zoom operation and the pan / tilt operation during autofocus.

[Example 4]
Next, in the case of autofocus control, another operation accompanied by a zoom operation by pushing and pulling the operation rod 3 will be described with reference to the flowchart of FIG. Since the configuration is the same as that of the first embodiment, description thereof is omitted.

The operation from STEP 401 to STEP 405 is the same as the operation from STEP 101 to STEP 111 in FIG. That is, when the AF selector switch 25 is turned on after the initialization process, the conversion from the output F _m by the rotary knob 4 to the focus movement amount ΔF _m is changed from the expression (1) to the expression (2), and thereafter A series of autofocus processes are performed to determine and drive the target position F _x1 of the focus lens group 9.

The program then proceeds to STEP406, to obtain a zoom operation amount Z _m from the zoom position sensor. Then determine the value of the zoom operation amount Z _m In STEP407, when the zoom operation amount Z _m is 0, determined not to be the zoom operation, the process directly proceeds to STEP409 previous without going through STEP408. Zoom operation amount Z _m is the positive side, or - in the case of side value, the process proceeds to STEP408, to hold the position of the focus lens group 9 is driven by the autofocus operation STEP111 from STEP 104. That is, the focus lens group 9 is stopped at the target focus position F _x1 obtained in STEP 111, and the focus position is fixed.

  Next, returning to STEP 402, if the AF changeover switch 25 is ON in STEP 402, the process proceeds to STEP 403 and subsequent steps, and the autofocus operation is repeated again.

If it is determined in step 407 that the zoom operation has not been performed, the process proceeds to step 409. The operations from STEP409 to STEP413 are the same as the operations from STEP112 to STEP116 in FIG. That is, when the output F _m of the rotary knob 4 is acquired and it is determined that there is an operation, the focus movement amount ΔF _m is calculated after the calculation of the expression (2). Then, a control signal for driving the focus lens group 9 to the target focus position F _x2 is generated from the focus movement amount ΔF _m .

Next, proceeding to STEP 413, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x2 via the clutch 17. And it returns to STEP402 again and repeats the same process.

  As described above, since the focus operation is stopped when the zoom operation is performed during the autofocus operation, it is possible to prevent the influence of the focus shift due to the unintentional rotation during the zoom operation. Therefore, the operator can concentrate on the zoom operation and the pan / tilt operation during autofocus.

[Example 5]
Next, another operation that is accompanied by a zoom operation by pushing and pulling the operation rod 3 in the case of autofocus control will be described with reference to the flowchart of FIG. Since the configuration is the same as that of the first embodiment, description thereof is omitted.

Steps 501 to 505 are the same as steps 101 to 111 in FIG. That is, when the AF selector switch 25 is turned on after the initialization process, the conversion from the output F _m by the rotary knob 4 to the focus movement amount ΔF _m is changed from the expression (1) to the expression (2), and thereafter A series of autofocus processes are performed to determine and drive the target position F _x1 of the focus lens group 9.

The process advances to STEP506, to obtain a zoom operation amount Z _m from the zoom position sensor. The program then proceeds to STEP507, to obtain the output F _m of the rotary knob 4. Then determine the value of the output F _m in STEP508, when the output F _m is 0 returns to STEP 502, the same process is repeated. If the output F _m is a value on the + side or − side, the process proceeds to STEP 509. In STEP509, to determine the value of the zoom operation amount Z _m, if a zoom operation amount Z _m is 0, determined not to be the zoom operation, the process proceeds to STEP512 previous without going through STEP511 from STEP 510. When the zoom operation amount Z _m is a value on the + side or − side, the process proceeds to STEP 510 and it is determined whether or not the output F _m is equal to or less than a preset value. When the output F _m is within the set value, the process proceeds to STEP 511, and the position where the focus lens group 9 is driven by the auto focus operation from STEP 104 to STEP 111 is held. That is, the focus lens group 9 is stopped at the target focus position F _x1 obtained in STEP 110, and the focus position is fixed. Next, returning to STEP 502, if the AF selector switch 25 is ON in STEP 502, the process proceeds to STEP 503 and subsequent steps, and the autofocus operation is repeated again.

On the other hand, if the output F _m exceeds the set value in STEP 510, the process proceeds to STEP 512. The operations from STEP 512 to STEP 514 are the same as the operations from STEP 114 to STEP 116 in FIG. That is, the focus movement amount ΔF _m is calculated after the calculation of the expression (2), and a control signal for driving the focus lens group 9 to the target focus position F _x2 is generated from the focus movement amount ΔF _m . Next, proceeding to STEP 514, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x2 via the clutch 17. And it returns to STEP502 again and repeats the same processing.

  As described above, the presence or absence of the zoom operation is determined, and the focus operation is stopped when the focus operation amount is within the set value. Therefore, the influence of defocus due to unintentional rotation during the zoom operation is prevented. Is possible.

  However, when the focus operation amount exceeds the set value, it is determined that the operation is intentionally performed, and the focus operation is performed. In other words, the dead zone for the focus operation is set during the zoom operation, and it is possible to concentrate on the zoom operation without worrying about a focus malfunction. This is particularly effective in situations where a fast zoom operation is required, since the rotation is unintentionally high. By the way, there is a possibility that the setting value of the focus operation amount may be changed depending on the shooting situation or the like. For example, a setting value change volume may be separately provided and the setting value may be changed accordingly.

[Example 6]
Next, another operation accompanied by a zoom operation by pushing and pulling the operation rod 3 in the case of auto focus control will be described with reference to the flowchart of FIG. Since the configuration is the same as that of the first embodiment, description thereof is omitted.

Steps 601 to 605 are the same as steps 101 to 111 in FIG. That is, when the AF selector switch 25 is turned on after the initialization process, the conversion from the output F _m by the rotary knob 4 to the focus movement amount ΔF _m is changed from the expression (1) to the expression (2), and thereafter A series of autofocus processes are performed to determine and drive the target position F _x1 of the focus lens group 9.

In step 606, the zoom operation change amount dz _m / dt is obtained from the zoom position sensor. The change amount dz _m / dt is the change amount of the zoom position sensor per unit time, and represents the speed at the time of zoom operation.

Next, in STEP 607, a focus operation sensitivity coefficient is selected from a matrix table as shown in FIG. In FIG. 10, the horizontal axis represents the zoom operation change amount dz _m / dt, and the vertical axis represents the focus operation sensitivity coefficient k ₁ . The zoom operation becomes faster as the horizontal axis is z1, z2 and so on, and the focus operation sensitivity is more sensitive as the vertical axis is f1, f2 and upward. Here, the sensitive coefficient of the focus operation sensitivity coefficient is selected when the zoom operation is slow, and the insensitive coefficient is selected when the zoom operation is fast. For example, when the zoom operation change amount is z1, the coefficient value of the a1 cell is selected, and when the zoom operation change amount is z3, the coefficient value of the a3 cell is selected. Zoom operation change amount is 0, i.e. when not in zoom, selects the set value of the coefficient k ₁ which is set in advance.

Next, proceed to STEP609. The operations from STEP609 to STEP613 are the same as the operations from STEP112 to STEP116 in FIG. That is, when the output F _m of the rotary knob 4 is acquired and it is determined that there is an operation, the focus movement amount ΔF _m is calculated after the calculation of the expression (2). Then, a control signal for driving the focus lens group 9 to the target focus position F _x2 is generated from the focus movement amount ΔF _m .

Next, proceeding to STEP 514, the motor 15 is operated via the D / A converter 30, and the focus lens group 9 is driven to the target focus position F _x2 via the clutch 17. Then, the process returns to STEP 602 again and the same processing is repeated.

As described above, since the focus operation sensitivity coefficient is selected according to the speed of the zoom operation, it is possible to prevent the possibility that the rotation knob 4 unintentionally increases the rotation angle as the zoom operation becomes faster. In the sixth embodiment, the focus operation sensitivity coefficient is selected from the matrix table of FIG. 10, but the coefficient k ₁ is calculated using a conversion formula between the zoom operation change amount corresponding to the change amount from a1 to a6 and the focus operation sensitivity coefficient. It may be changed.

[Example 7]
Next, each setting switch of the lens apparatus 100 provided in the operation unit 400 will be described.

  The operation unit 400 is provided with a pan bar 33 for performing a pan / tilt operation. The operator holds the pan bar 33 to perform an operation. An AF selector switch 25 is disposed in front of the pan bar 33. Further, in front of the AF selector switch 25, a direction selection switch 34 for moving the focus detection range at the time of autofocus within the effective pixel range of the CCD 8 is disposed. Further, a servo changeover switch 24 and a sensitivity change knob 28 are arranged in front. On both sides of the servo switch 24, a switch 35 and a switch 36 other than the auto focus of the lens apparatus 100 and the setting of the single-axis two-operation method are arranged. For example, if the lens device 100 includes an insertion / removal variable lens group (not shown) on the optical axis, the switch 35 and the switch 36 set the insertion / removal operation of the variable magnification lens, If the group is included (not shown), the vibration-proof sensitivity can be changed and the operation ON / OFF can be switched. The operator uses the various switches described above by changing the setting according to the shooting situation.

  As described above, since various setting change switches are provided in the operation unit 400 and the operation rod 3 and the rotary knob 4 are not configured, the operator can use only one focus and zoom operation to operate with one axis and two operations. You can concentrate. It is also possible to prevent the switch from being accidentally pressed during zoom operation or focus operation.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

3 Operation rod 4 Rotating knob 9 Focus lens group 10 Zoom lens group 14 Detection sensor 15 Motor 16 Focus position sensor 18 Motor 19 Zoom position sensor 21 Aperture 23 CPU
24 Servo changeover switch 25 AF changeover switch 26 Focus operation amount sensor 27 Zoom operation amount sensor 28 Sensitivity variable knob 100 Lens device 200 TV camera 300 Operation table 400 Operation unit

Claims (9)

Focus optical system, lens barrel including zoom optical system, focus optical system, autofocus focus detection means, manual focus operation means, autofocus focus detection means, or focus command of manual focus operation means It comprises control means for controlling the drive of the focus optical system according to the signal, and focus operation switching means for switching between autofocus drive and manual focus drive control, and the input signal from the focus operation switch means is used for autofocus drive. A lens apparatus having focus operation sensitivity changing means for changing a movement amount of the focus optical system with respect to an operation amount of the manual focus operation means when set. 2. The lens apparatus according to claim 1, wherein the zoom / focus lens is driven by a uniaxial, two-operation type zoom / focus operation means. The lens apparatus according to claim 1, wherein the focus operation sensitivity changing unit is set so that an operation sensitivity at the time of autofocus driving is set lower than an operation sensitivity at the time of manual focus driving. 4. The lens device according to claim 1, further comprising an operation sensitivity changing unit that changes an operation sensitivity of the manual focus operation unit in accordance with a zoom drive state during autofocus drive. Lens device. 3. The lens device according to claim 1, wherein the lens device stops the operation by the manual focus operation means when the zoom device is in a zoom drive state during auto focus drive. 4. The lens apparatus includes a focus operation amount determination unit that determines whether or not a focus operation amount by the manual focus operation unit is within a set value according to a zoom drive state during autofocus drive, and is zoom driven. 3. The lens apparatus according to claim 1, wherein the operation by the manual focus operation means is stopped when the focus operation amount is equal to or less than a set value in the state of being in the closed state. The lens apparatus has an operation amount detection means for detecting a change amount of a zoom operation and conversion data or a conversion formula of the manual focus operation sensitivity corresponding to the change amount of the zoom operation, and is detected by the operation amount detection means. 3. The lens apparatus according to claim 1, wherein the focus operation sensitivity is changed according to the zoom operation change amount. The lens apparatus according to claim 2, further comprising a manual focus operation sensitivity changing unit that can be arbitrarily set. 9. The lens apparatus according to claim 2, wherein the focus operation switching unit or the manual focus operation sensitivity changing unit is configured as an operation unit capable of pan / tilt operation.