JP2018077364A - Lens device, operating device, and lens system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating device and a lens device that have better operability by taking into consideration power supply capability of supplying power to a driving part of an optical lens.SOLUTION: A lens device 90 comprises: an optical element 15; driving means 14 that drives the optical element; and control means 13 that controls the driving means. The control means is a signal obtained by adding up a first signal Sd for operating the optical element and a second signal Pn obtained by multiplying a differential value of the first signal by a coefficient α; the coefficient is a function of the first signal. The coefficient is a function of the capability to supply power to the driving means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an operating device, a lens device, and a photographing system used for a broadcast camera.

  In a large broadcast lens device or the like, a controller is connected to the lens to drive a movable portion of the optical lens such as zoom, focus, and iris. Here, the present invention compensates for delay elements of the driving system of the lens apparatus and the controller, and various delay elements caused by the operation of the photographer, and also reduces the operability caused by the output characteristics of the controller. In order to compensate for the factors, the technique of Patent Document 1 below was invented.

Japanese Patent No. 4865398

  In the present invention, when researching the operability of the controller and the lens device, when the current limit value of the drive target is increased, the calculation process performed in Patent Document 1 (the process corresponding to Claim 1 of the same document) is performed during deceleration. A new problem has been discovered in which excessive braking occurs and it becomes difficult for the user to stop the driving target smoothly.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an operating device, a lens device, and a lens device that have better operability, taking into account the power supply capability of supplying power to the optical lens drive unit. It is another object of the present invention to provide an operating device and a lens device that can secure an optimum power supply capability for the required operability.

The technical features of the lens device according to the present invention for achieving the above object are as follows:
An optical element, drive means for driving the optical element, control means for controlling the drive means,
A lens device comprising:
The control means includes a first signal for operating the optical element;
A signal obtained by adding a second signal obtained by multiplying a difference value of the first signal by a coefficient,
In the lens apparatus, wherein the coefficient is a function of the first signal,
The coefficient is a function of a power supply capability with respect to the driving means.

  The operation device and the lens device according to the present invention have superior operability in consideration of the power supply capability of supplying power to the optical lens drive unit.

2 is a functional block diagram of a lens apparatus according to Embodiment 1. FIG. 2 is a perspective view of a controller according to Embodiment 1. FIG. 4 is a waveform of each part of Example 1. It is a follow chart explaining the process in the difference calculating means of Example 1. It is a figure explaining coefficient (alpha) in the difference calculating means of Example 2. FIG. It is a follow chart explaining the process in the difference calculating means of Example 2. 6 is a functional block diagram of a lens apparatus according to Embodiment 3. FIG. It is a follow chart explaining the process in the electric current limitation determination means of Example 3. 10 is a waveform of each part of Example 4.

The present invention will be described in detail based on the embodiments shown in the drawings.
[Example 1]
FIG. 1 is a functional block diagram of the lens device 90. The lens device 90 mainly includes a difference calculation means 91, an addition means 12, a control means 13, a drive means 14, an optical lens section 15, and a current limit determination means 96. Yes.

  The difference calculation means 91 receives a command signal Sd (: first signal, expressed as Vn inside the lens device) from the controller 30 of FIG. A difference from the previous command signal Vn−1 is calculated, and a calculation result Qn = α × (Vn−Vn−1) obtained by multiplying a coefficient α determined by a current limit value Lim described later is output to the adding means 12. Note that by multiplying the coefficient α, there is an advantage that the difference calculation amount can be adjusted to a desired range.

  With this configuration, the lens device 90 adds the difference calculation signal Pn of the command signal Vn to the command signal Vn by the adding means 12, and the control means 13 outputs the drive signal Sc based on the addition result (Vn + Pn), thereby driving the drive means. 14 to control the controlled object. Accordingly, when the command signal Vn changes sharply, the difference calculation signal Pn increases, and thus the control means 13 controls the driving means 14 by reflecting the steepness in the command signal Vn.

  The drive unit 14 receives the drive signal Sc and a current limit value Lim, which will be described later, and drives the movable part of the optically connected optical lens unit 15 below the current limit value Lim. The optical lens unit 15 is attached to a zoom lens mechanically connected to the driving unit 14. The current limit determining means 96 is a publicly known electronic switch that determines the current limit, and outputs the current limit value Lim set by this switch to the difference calculating means 91 and the driving means 14.

  In general, a sensor for detecting the current position in the movable range is attached to the movable part of the optical lens unit 15, and the position signal Sf, which is the output of this sensor, is fed back to the control means 13 to provide feedback. Control is in progress. When performing this feedback control, the signal for detecting the state of the movable part is not limited to the position signal, and a necessary signal may be appropriately detected according to the control method or the like to perform the feedback control.

  There is no problem even if the lens device 90 holds the above-described command signal Sd as internal data, and the control method is not limited. The optical lens unit of the optical lens unit 15 may be a focus lens, an iris (aperture) unit, or an extender lens, and the form thereof is not limited.

  FIG. 2 is a perspective view of a controller 30 that is a rotary type signal adjusting means. This type of controller 30 that detects the rotation of the thumb ring 31 that is an operation unit is generally called a zoom demand. Mainly by a thumb ring 31, a potentiometer 32 for detecting rotation, a speed command value calculating means 33 for receiving the output, a spring coefficient adjusting means 34 for adjusting the magnitude of the spring coefficient, a demand curve switch 35, and a demand cable 36 which is a signal line. It is configured.

  The rotation shaft of the thumb ring 31 is mechanically connected to the rotation shaft of the potentiometer 32, and the potentiometer 32 outputs the rotation angle signal Ss to the speed command value calculation means 33. The speed command value calculating means 33 determines a command signal Sd that is the final output of the controller 30, and the spring coefficient adjusting means 34 adjusts the restoring force of the spring connected to the thumb ring 31. The demand curve switch 35 selects one of a plurality of demand curves, and the demand cable 36 sends a command signal Sd to the lens device 90.

  The spring connected to the thumb ring 31 is mechanically connected to the rotation shaft of the thumb ring 31, and the operation unit 31 rotates in the X direction or -X direction in FIG. 2 according to the external force, and this external force is removed. The spring is restored to the center position O by the restoring force.

  Next, details of the lens operation will be described below. FIG. 3 is a diagram for explaining the details of the lens operation, and shows a speed control signal Vn, a drive current, and a position signal Sf of the optical lens unit output from the controller 30 at a certain time. Here, all waveforms for the same speed control signal Vn are shown here. Also, in FIG. 3, the case where the difference calculation means 91 is not applied (Qn in FIG. (B), (C)). (B) is the case where the current limit value Lim is Lim2, and (C) is the case where the current limit value Lim is Lim3 (Lim2 <Lim3). Furthermore, time t1, 2, 3, 4, 5 is defined in time series order.

  In FIG. 3, with respect to the control Vn, the control corresponding to the maximum speed is maintained by the operation of the controller 30 until the time t1, the above (A) is gradually decelerated from the time t1 to the time t4, and zero (stop) at the time t4. (B) and (C), the speed control signal Vn is processed by the calculation process of the difference calculation means 91, so that it changes sharply immediately after time t1 and reaches zero. .

  Next, with regard to the drive current, in (A) to (C) above, a constant current in the highest speed drive state flows until time t1. In the case of (A), a brake current that is temporarily saturated with the current limit Lim2 flows immediately after time t1. Thereafter, a weak brake current flows until time t5, and the current becomes zero after time t5. On the other hand, in the case of (B) above, the brake current of the current limiting Lim2 continuously flows from time t1 to time t3, and the current becomes zero after time t3. In the case of (C), a large brake current of the current limit Lim3 continuously flows from time t1 to time t2, and the current becomes zero after time t2.

  Finally, regarding the position signal Sf, the above (A) to (C) change at the maximum speed until the time t1. In the case of (A), the vehicle decelerates from time t1 to time t4 and stops at time t5. On the other hand, in the case of (B) above, the vehicle is decelerated and stopped in a short time from time t1 to time t3. Furthermore, in the case of (C) above, since the current limit value has been relaxed (Lim2 → Lim3), a very large brake is applied from time t1 to time t2, and it stops suddenly.

  As described above, when the calculation content (Qn = α × (Vn−Vn−1)) of the difference calculation means 91 is unchanged regardless of the current limit value, the current limit value increases (above (B) → (C) ), A larger brake current continuously flows and stops suddenly.

  As described above, according to the present invention, when researching the operability of the controller and the lens device, when the current limit value increases, excessive braking occurs due to the calculation processing of the difference calculation means 91, and as a result, smooth for the user. I discovered a new problem that makes it difficult to stop the lens.

  Therefore, the present invention applies a process in which the coefficient α calculated in the difference calculation means 91 is a function of the current limit value so that excessive braking does not occur even when the current limit value increases.

  Hereinafter, a method for determining the coefficient α in the difference calculation means 91 will be described. FIG. 4 is a flowchart illustrating a method for determining the coefficient α in the difference calculation unit 91.

  First, in step ST01, the difference calculation means 91 acquires the current limit value Lim. Next, in step ST02, the acquired Lim is compared with the existing current limit value Lim1, and if Lim is less than Lim1, the process proceeds to step ST04, and if Lim is greater than or equal to Lim1, the process proceeds to step ST03. In Step ST03, if Lim is less than the existing current limit value Lim2 (Lim1 <Lim2), the process proceeds to Step ST05, and if Lim is greater than or equal to Lim2, the process proceeds to Step ST06. In step ST04, α is α1 × 2, α is α1 in step ST05, and α is α1 × 1/2 in step ST06.

  With the above processing, when the current limit value Lim is Lim1 to Lim2 and the coefficient α = α1, the coefficient α is set to a larger value (α1 × 2) when the current limit value Lim is less than Lim1. Conversely, if Lim2 or more, the coefficient α is set to a smaller value (α1 × 1/2).

  Therefore, in the case of (C) described in FIG. 3 (Lim3 whose current limit value is larger than Lim2), the coefficient α is α1 × 1/2 in step ST06. For example, the current limit value is Lim3 while the coefficient α remains α1. Compared with the case where it becomes, it can suppress an excessive brake. Accordingly, it is possible to follow the same locus (position signal Sf) as in the case of (B) and stop at time t3 later than time t2.

  Conversely, when the current limit Lim is less than Lim2, the brake current is smaller than Lim2, and thus the time required for stopping may increase. However, by setting the coefficient α to α1 × 2, the stop time is increased. Unnecessary lengthening can also be removed.

[Example 2]
Different embodiments are described below. This embodiment is different in that the coefficient α of the difference calculation means 91 of the first embodiment is changed.

  FIG. 5 is a graph of the coefficient α in the difference calculation means used in the lens apparatus of Example 2, and is composed of three lines: α = k1 / Vn + k2, α = k1 / Vn + k3, α = k1 / Vn + k4.

  Hereinafter, a method for determining the coefficient α in the difference calculation means of the present embodiment will be described. FIG. 6 is a flowchart illustrating a method for determining the coefficient α in the difference calculation means. Steps ST01 to ST03 are the same as those in FIG. 4 of the first embodiment. In steps ST07 to ST09, the coefficients α are set to α = k1 / Vn + k3, α = k1 / Vn + k2, and α = k1 / Vn + k4, respectively.

  Accordingly, α = k1 / Vn + k3 is applied when Lim is less than Lim1, α = k1 / Vn + k2 is applied when Lim is less than Lim2, and α = k1 / Vn + k4 is applied when Lim is greater than or equal to Lim2. The

  The zoom demand curve for broadcasting is generally set so that the zoom speed is set to have a small slope in the low speed range for the purpose of facilitating the low speed. In this way, the coefficient α is set to Vn. By using an inverse function, the coefficient α is large when Vn is small, and the coefficient α is small when Vn is large. Therefore, even when Vn is small, operability is not sacrificed.

  Further, the excessive braking of (C) described in FIG. 3 of the first embodiment generally occurs in many cases where Vn is large (Vn−Vn−1 also tends to increase). If the second term (k3, k4, k5) of the right side of the above three formulas, which is more effective when larger, is reduced, this excessive braking suppression can be effectively prevented and the operability when Vn is small is not sacrificed. .

[Example 3]
Further different embodiments will be described below. In the first embodiment, the coefficient α of the difference calculating unit 91 is a function of the current limit value Lim. In the present embodiment, the current limit value Lim is a function of the coefficient α. Further, instead of the difference calculation means 91 and the current limit determination means 96 of the first embodiment, a difference calculation means 101 and a current limit determination means 106 are used, and a display means 107 is newly added.

  The difference calculation unit 101 is different from the difference calculation unit 91 in that a publicly-known public switch (not shown) is added. The coefficient α is determined by selecting this switch, and the coefficient α is output to the current limit determination unit 106. .

  The current limit determining means 106 determines the current limit value based on the coefficient α output from the difference calculating means 101 instead of the publicly known electronic switch that determines the current limit. The display unit 107 is a display unit that displays the coefficient α and the current limit value.

  Hereinafter, a method of determining the current limit value Lim in the current limit determining means of the present embodiment will be described. Note that a magnitude relationship between coefficients α1 and α2 described later is α1 <α2. FIG. 8 is a flowchart illustrating a method for determining the current limit value Lim in the current limit determining means 106.

  First, in step ST10, the current limit determining means 106 acquires the coefficient α. Next, in step ST11, the acquired coefficient α is compared with the existing threshold value α1, and if the coefficient α is less than α, the process proceeds to step ST13, and if the coefficient α is greater than or equal to α1, the process proceeds to step ST12. In step ST12, when the coefficient α is less than α2, the process proceeds to step ST14, and when the coefficient α is equal to or greater than α2, the process proceeds to step ST15. In Steps ST13 to ST15, Lim is set to Lim1, Lim2, and Lim3.

  As described above, the current limit value is larger when the coefficient α is large and the current saturation is more likely to occur, and conversely when the current saturation is difficult to occur, the current limit value can be set small. As a result, the current limit value is not set to be unnecessarily large. For example, even when an abnormal current flows, a new effect is achieved in which the current limit value can be suppressed with a stable current limit value.

[Example 4]
Further different embodiments will be described below. In the first embodiment, the case of decelerating (stopping) has been described. In this embodiment, the case where the present invention is applied during acceleration in the first embodiment (FIGS. 1 to 3) will be described.

  In addition, from the results of experiments and field tests, the inventor has found in the past that overshoot that occurs when the photographer is stopped is recognized as the most concerned problem. Therefore, in this embodiment, it is conceivable to increase the coefficient α when accelerating compared to when decelerating. However, if the coefficient α is excessively increased when the current limit value is low, the drive current is now limited by the current limit. It has been newly discovered that the time to saturate becomes longer and the operational feeling decreases.

  Therefore, in this embodiment, by selecting α larger than the coefficient α at the time of deceleration while preventing a decrease in the operation feeling accompanying the increase in the saturation time, a good operational feeling at the time of acceleration is realized. A more appropriate coefficient α can be set.

  FIG. 9 is a diagram for explaining the details of the lens operation in the same manner as FIG. 3 of the first embodiment, and shows a case where acceleration is performed from the stop time. Hereinafter, (A) to (C), current limit values Lim2 and Lim3, and times t1 to 5 are defined in the same manner as in the first embodiment.

  First, regarding the control Vn, it is assumed that the controller 30 is stopped by the operation of the controller 30 until the time t1, is accelerated to the beginning from the time t1 to the time t4, and reaches the highest speed at the time t4 ((A)), (B) In the cases (C) and (C), the control signal Vn is processed by the calculation processing of the difference calculation means 91, so that it changes sharply immediately after time t1 and reaches the maximum speed.

  Next, regarding the drive current, (A) to (C) are in a stopped state until time t1, and thus the current is zero. In the case of (A), an acceleration current that is temporarily saturated with the current limit Lim2 flows immediately after time t1, and then a constant current that is driven at the highest speed flows. On the other hand, in the case of (B), the acceleration current of the current limiting Lim2 continuously flows from time t1 to time t3, and a constant current flows after time t3. In the case of (C), a large acceleration current of the current limit Lim3 relaxed from time t1 to time t2 continuously flows, and a constant current flows after time t2.

  Finally, regarding the position signal Sf, (A) to (C) change in a stopped state until time t1. In the case of (A) above, the vehicle accelerates to the beginning from time t1 to time t4 and reaches the highest speed at time t5. On the other hand, in the case of the above (B), it is accelerated in a short time from the time t1 to the time t3 and reaches the maximum speed. Furthermore, in the case of (C), since the current limit value is relaxed (Lim2 → Lim3), a very large acceleration is applied from time t1 to time t2, and the maximum speed is rapidly reached.

  As described above, when the calculation content (Qn = α × (Vn−Vn−1)) of the difference calculation means 91 is unchanged regardless of the current limit value, the current limit value increases ((B) → (C)). Larger acceleration current flows and accelerates rapidly.

  Therefore, when the coefficient α is determined as a function of the current limit as in the first to third embodiments and is set larger than that during deceleration, the time for saturation by the current limit is not unnecessarily prolonged, and the deterioration of the operational feeling is prevented. In addition, the effect of the calculation (Qn = α × (Vn−Vn−1)) in the difference calculation means 91 can be obtained more than during deceleration.

  It should be noted that the coefficient α of the present embodiment has no problem even if the method of determining the coefficient α in the second to third embodiments is used. For example, the coefficient α in steps ST04 to ST06 in FIG. Alternatively, k3, k2, and k4 in steps ST07 to ST09 of FIG. Also, the current limit values Lim1, Lim2, and Lim3 of FIG.

90, 100 Lens devices 91, 101 Difference calculation means 12 Addition means 13 Control means 14 Drive means 15 Optical lens portions 96, 106 Current limit determination means 107 Display means

Claims (8)

An optical element, drive means for driving the optical element, control means for controlling the drive means,
A lens device comprising:
The control means includes a first signal for operating the optical element;
A signal obtained by adding a second signal obtained by multiplying a difference value of the first signal by a coefficient,
In the lens apparatus, wherein the coefficient is a function of the first signal,
The lens device according to claim 1, wherein the coefficient is a function of a power supply capability to the driving unit. The lens device according to claim 1,
When the coefficient α is negative,
The coefficient α when the current supply capability is high is set smaller than the coefficient α when the current supply capability is low. The lens device according to claim 1,
When the coefficient α is positive,
The coefficient α when the current supply capability is high is set larger than the coefficient α when the current supply capability is low. The lens apparatus according to any one of claims 1 to 3,
The lens apparatus according to claim 1, wherein the current supply capability is a current limit value of a power source or an impulse response capability of the power source. An optical element, drive means for driving the optical element, control means for controlling the drive means,
A lens device comprising:
The control means includes a first signal for operating the optical element;
A signal obtained by adding a second signal obtained by multiplying a difference value of the first signal by a coefficient,
In the lens apparatus, wherein the coefficient is a function of the first signal,
The lens apparatus according to claim 1, wherein the power supply capability to the driving means is a function of the coefficient. An operation device including an operation unit for driving an optical element of a lens device,
Comprising a control means for outputting an operation signal in accordance with the position of the operation unit;
The operation signal is a signal obtained by adding a first signal corresponding to the position of the operation unit and a second signal obtained by multiplying a difference value of the first signal by a coefficient. And
The coefficient is a function of the first signal,
The operating device according to claim 1, wherein the coefficient is a function of power supply capability to the driving means. An optical element, drive means for driving the optical element, control means for controlling the drive means,
A lens device, and
An operation device including an operation unit for driving an optical element of the lens device; and
A first signal for operating the optical element output by the operating device;
A difference calculation device that generates a signal obtained by adding a second signal obtained by multiplying a difference value of the first signal by a coefficient,
The coefficient is a function of the first signal,
The difference calculation device according to claim 1, wherein the coefficient is a function of a power supply capability to the driving means. An imaging system including a lens device, an operation device for the lens device, and the difference calculation device according to claim 11.