JP2007027926A - Broadcast television lens apparatus and television camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a broadcast television lens apparatus for facilitating the analysis of a cause to a problematic operation by detecting a state of a lens moving part and recording the state at a point of time when the occurrence of a fault or a defect is discriminated. <P>SOLUTION: A zoom ring 12 is fitted to a lens 11, the zoom ring 12 is driven by a drive means 13, and a state detection means 14 detects a motion of the zoom ring 12. An output signal of the state detection means 14 as a follow signal S1 is given and connected to a control means 15, an arithmetic means 16, and a recording means 17, an output signal of the control means 15 is given and connected to the drive means 13 as a control signal S2, and an output signal from the arithmetic means 16 is given to the recording means 17. When the follow signal S1 exceeds a reference value, the arithmetic means 16 outputs a recording start signal S4 to the recording means 17. The recording means 17 starts recording the follow signal S1 of the state detection means 14 at a start point of time when the recording means 17 receives the recording start signal S4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a broadcast television lens apparatus and a television camera system having an operation state recording means.

  In broadcasting and commercial lens devices, higher reliability is always required, so it is extremely important to accurately grasp the maintenance timing. Therefore, as a television camera lens apparatus having a recording means for recording an operation history, there is a technique such as Patent Document 1 for example.

  FIG. 13 shows a conceptual diagram of such a prior art lens apparatus. This conventional lens apparatus is, for example, a lens 1 that is an optical adjusting means, a control means 2 for the lens 1, and a lens 1 according to a command from the control means 2. Drive means 4 for driving the movable part 3 and state detection means 5 for detecting the state of the movable part 3, and the control means 2 is driven based on the detection result of the follow signal from the state detection means 5. A control signal is fed back to the means 4. In addition, a counting unit 6 that calculates the number of operations of the movable unit 3 based on the output of the state detection unit 5 and a recording unit 7 that records the number of operations calculated by the counting unit 6 are provided. Then, the past number of operations recorded by the recording means 7 is confirmed, and the lens apparatus is appropriately maintained.

  In general, the lens 1 includes an optical lens, and examples of the movable unit 3 include a focus ring that performs focus adjustment, a zoom ring that adjusts zoom, and an iris ring that adjusts iris.

JP 2002-182100 A

  However, in an actual lens device, the usage environment and the like are often different depending on each individual. In particular, compared to consumer lens devices, broadcast and commercial lens devices can be used in studios only or when used in harsh outdoor environments such as deserts. Used in harsh environments.

  Therefore, it is difficult to accurately grasp the maintenance time only by recording simple use conditions such as the number of uses. Therefore, a method of solving such a problem by always recording the detailed operation state and use environment of the lens device is also conceivable. However, in this method, it is necessary to always record detailed information about the lens apparatus, and as a result, the recording means requires a huge recording capacity, which leads to a significant increase in cost and the number of parts. It is extremely difficult.

  The object of the present invention is to detect the state of the lens movable part and record this state based on the time when it is determined that an abnormality or failure has occurred, or when it is determined that there is a concern, and the maintenance time is set. It is an object of the present invention to provide a broadcast television lens device and a television camera system that can be accurately grasped.

  In order to achieve the above object, the technical feature of the television lens device for broadcasting according to the present invention is that a lens having a controllable movable part, a control means for the lens, and the movable part is driven by a command from the control means. Preparing a reference value for each detection target of the state detection unit, a state detection unit that detects a state of the movable part and outputs a detection result, a recording unit that records the detection result, And calculating means for calculating a difference from the detection result of the detection target, wherein the recording means starts recording the detection result based on a time point when the difference exceeds a certain value.

  Further, the technical features of the broadcast television lens device according to the present invention include a lens having a controllable movable part, a control means for the lens, and a drive means for driving the movable part according to a command from the control means, A state detection unit that detects a state of the movable part and outputs a detection result, and temporarily holds the detection result of the state detection unit and outputs the oldest detection result while replacing the latest detection result. Holding means, recording means for recording the detection results output from the holding means, and calculation means for preparing a reference value for each detection target of the state detection means and calculating a difference between the detection results of the detection targets And the recording means starts recording the detection result starting from a point in time when the difference exceeds a certain value and retroactive for a certain period.

  Further, the technical features of the broadcast television camera system according to the present invention can be controlled in the broadcast television camera system configured by the broadcast television lens device and the television camera device connected to the television lens device to capture images. A lens having a movable part, a control means for the lens, a drive means for driving the movable part according to a command from the control means, a state detection means for detecting a state of the movable part and outputting a detection result, A recording unit that records the detection result; and a calculation unit that prepares a reference value for each detection target of the state detection unit and calculates a difference between the detection result of the detection target and the difference exceeds a certain value. The recording means is to start recording the detection result based on the point in time.

  A technical feature of the broadcast television camera system according to the present invention is that the broadcast television camera system includes a broadcast television lens device and a television camera device that is connected to the television lens device and captures an image, and has a movable part. A lens, a control unit for the lens, a drive unit for driving the movable unit according to a command from the control unit, a state detection unit for detecting a state of the movable unit and outputting a detection result, and a state detection unit A holding means for temporarily holding a detection result and replacing the latest detection result while outputting the oldest detection result, a recording means for recording the detection result output by the holding means, and the state detection means And a calculation means for calculating a difference from the detection result of the detection target for each detection target, and a predetermined period from the time when the difference exceeds a predetermined value. As a base point to the time of the 及, the recording means is to start recording of the detection result.

  According to the broadcast television lens device and the television camera system of the present invention, the malfunction of the lens device is recorded by recording the subsequent operation of the lens device, triggered by detecting a malfunction or abnormal operation, or their precursor operation. In addition, by recording a precursor operation of an abnormal operation, a malfunction or an abnormal operation, and a subsequent elapsed operation itself, the cause analysis of these problematic operations to be solved is made easier.

  Furthermore, since it is possible to record a time point retroactive from the above trigger as a base point, it is possible to grasp from the operation before the malfunction of the detection target or the precursor operation of the abnormal operation occurs. Therefore, the above cause analysis can be further facilitated.

  Further, since detailed information regarding the lens apparatus is not always recorded, the recording means only needs a minimum recording capacity, so that a significant increase in cost and an increase in the number of parts are not caused.

  If the lens usage environment, which often causes malfunctions and abnormal operations, such as weather conditions represented by temperature and humidity, is also grasped and recorded, the maintenance time can be grasped more accurately. In addition, the accuracy of the cause analysis of such problem operation can be greatly improved.

  The present invention will be described in detail based on the embodiment shown in FIGS.

FIG. 1 is a configuration diagram of a lens apparatus according to the first embodiment. A zoom ring 12 is attached to a lens 11, the zoom ring 12 is driven by a driving unit 13, and the movement of the zoom ring 12 is performed by a state detection unit 14. It is to be detected. The output of the state detection means 14 is connected to the control means 15, the calculation means 16 and the recording means 17 as a follow signal S1, the output of the control means 15 is connected to the drive means 13 as a control signal S2, and the output of the calculation means 16 is It is connected to the recording means 17.

  The state detection means 14 is generally composed of a potentiometer, which is a rotary variable resistor, and is means for detecting rotational position information of the zoom ring 12. The resistance value changes in accordance with the rotation of the potentiometer. This rotational position information is output as a follow signal S1.

  The control means 15 is a means for outputting a control signal S2 for feedback control of the zoom ring 12 of the movable portion of the lens 11 to the drive means 13, and a semiconductor element such as a microcomputer is used. Usually, the calculation means 16 functions as a function. Contains.

  As shown in FIG. 2, the drive means 13 is a means for driving the zoom ring 12, and is composed of a drive motor 13a and a drive circuit 13b. A control signal S2 from the control means 15 is input to the drive circuit 13b. The drive signal S3 is output to the drive motor 13a. The drive motor 13a transmits a mechanical driving force to the zoom ring 12 which is a movable part.

  As shown in FIG. 3, the calculation means 16 includes a comparator 16a. When the follow signal S1 and the prepared reference value R1 are input to the comparator 16a and the follow signal S1 exceeds the reference value R1, recording is performed. A start signal S4 is output to the recording means 17. This reference value R1 is desirably set to an optimum value in accordance with a remarkable abnormality, failure, detection target, or the like.

  The recording means 17 starts recording the follow signal S1 of the state detecting means 14 from the time point when the recording start signal S4 from the calculating means 16 is input, and ends this recording when the main power supply is turned off. The recording end method does not have to be on / off of the main power supply.

  In this way, the recording means 17 records the operation of the follow signal S1 exceeding the reference value R1, so that it is easy to analyze the cause of the problem operation when there is a malfunction or abnormal operation. Further, since detailed information regarding the lens apparatus is not always recorded, the recording means 17 has only a minimum necessary recording capacity, and does not cause a significant increase in cost and the number of parts.

  FIG. 4 is a configuration diagram of the lens apparatus according to the second embodiment. When a driving current for driving the focus ring 21 is detected as a driving signal for the movable part, the driving signal exceeds a reference value R2 described later. Recording of the recording means 17 is started from the starting point.

  A zoom ring 12, a focus ring 21, and an iris ring 22 are attached as operating units to the lens 11 of the lens apparatus of the second embodiment, and a driving unit 13 and a state detection unit 14 are provided on each ring. The lens 11 can adjust the zoom, focus, and iris of the lens 11 by rotating each ring installed on the outer periphery of the housing. The lens 11 is mechanically connected with the drive motor 13a on the outer periphery of each ring. A gear for realizing transmission of power is provided.

  The outputs of the state detection means 14 and the drive means 13 ′ for driving the focus ring 21 are connected to the A / D conversion means 23. The output of the A / D conversion means 23 is connected to the control means 15, the calculation means 24 and the recording means 17, and the output of the calculation means 24 is connected to the recording means 17. Further, the control means 15 is connected to the output of the control target selection means 25, and the control signal S 2 of the control means 15 is connected to each driving means 13 via the D / A conversion means 26.

  As shown in FIG. 5, the control object selection means 25 is a means for generating a command signal S5 for driving each control object of focus, zoom, and iris at a constant speed, and one switch is provided for each control object. 25a to 25c are prepared. Further, these switches 25a to 25c are switches that can select three modes of forward / reverse rotation directions of the rings 12, 21, and 22 and driving stop of the rings 12, 21, and 22.

  The control means 15 outputs a control signal S2 for executing the command signal S5 to the drive means 13 ', 13, and 13 and inputs a digital signal S6 based on the follow signal S1 of the state detection means 14 to be controlled. The rings 12, 21 and 22 are feedback-controlled by the driving means 13.

  As shown in FIG. 6, the driving unit 13 'includes a driving circuit 13b, a driving motor 13a, and a current detection unit 13c, and is a unit for driving the focus ring 21. The current detection means 13c detects the drive current to the drive motor 13a output from the drive circuit 13b, and outputs a current detection signal S7.

  The A / D conversion means 23 and the D / A conversion means 26 are known conversion means, respectively. The A / D conversion means 23 is a follow signal S1 which is a detection result of the state detection means 14 which is an analog signal, and a current detection signal. Each of S7 is converted into a digital signal S6, and the D / A converter 26 converts the control signal S2 which is a digital signal into a control signal S8 which is an analog signal.

  In the calculation means 24, as shown in FIG. 7, the current detection signal S7 and the reference value R2 from the current detection means 13c are input to the comparator 24a. When the current detection signal S7 exceeds the reference value R2 (S7-R2> 0), the calculation means 24 outputs a recording start signal S4, and the recording means 17 starts from the time when the recording start signal S4 is input. Recording of the digital signal S6 of the current detection signal S7 is started, and the recording is ended when the power of the lens device is turned off.

  Here, if the reference value R2 is set to, for example, the maximum drive current value of the drive motor 13a of the drive means 13 'during normal operation, the time point when the current supply to the drive motor 13a abnormally increases is used as a base point. The operation of the focus drive system itself is recorded until the power is turned off.

  Thus, in the lens apparatus of the present embodiment, focusing on the current supplied to the drive motor 13a of the drive means 13 ′ of the focus ring 21, the subsequent drive is triggered by the detection of an abnormal increase in current and the indication thereof. Record system activity. Therefore, it is not just a record of error mode, but a precursor operation of malfunction or abnormal operation, or malfunction or abnormal operation, and the subsequent elapsed operation itself are recorded. Therefore, it is easier to analyze the cause of the problem operation to be solved. .

  In this embodiment, a method of controlling each driving element at a constant speed is adopted, but this control method is not limited.

  FIG. 8 is a configuration diagram of the lens apparatus according to the third embodiment. In the lens apparatus according to the second embodiment, another calculation unit 31 is used instead of the calculation unit 24.

  As shown in FIG. 9, the calculating means 31 has a comparator 31a, and the follow signal S1 and the reference value R3 of the state detecting means 14 are input to the comparator 31a.

  In this lens apparatus, each drive means 13 is feedback-controlled by a follow signal S 1 from each state detection means 14 based on the control object selection means 25. The follow signal S1 sets the center of the movable range to zero, and adjusts each part so that the absolute value becomes larger (the sign indicates directionality) as the movable part moves away from the center.

  In the recording means 17, for example, the follow signal of the focus ring 21 is detected as the follow signal S 1 of the movable part, and recording is started from the time when the follow signal S 1 exceeds the reference value R 3 as a base point. Yes.

  In order to prevent the movable portion of the lens 11 from colliding with the mechanical end portion of the movable range during normal motor driving, an electrical operation limit is provided inside the mechanical end portion. Therefore, if the reference value R3 is set to the same value as the operation limit, the base point is the time when the movable part of the lens 11 enters the vicinity of the mechanical end that cannot be reached by normal motor drive. The operation of the focus drive system is recorded until the lens device is turned off.

  FIG. 10 is a configuration diagram of the lens apparatus of Example 4. In this lens apparatus, when the spectrum of a specific frequency exceeds the reference value R4 in the FFT (Fast Fourier Transform) analysis result of the difference between the follow signal S1 of the focus ring 21 and the control signal S2 of the control means 15. Thus, the recording of the recording means 17 is started with the time point retroactive for a certain period.

  In the fourth embodiment, the digital signal S6 output from the A / D conversion means 23 is connected to the control means 15, the holding means 41, and the calculation means 42. The outputs of the holding means 41 and the calculating means 42 are both connected to the recording means 17, and the output of the recording means selecting means 43 is connected to the recording means 17. The control signal S2 of the control means 15 is connected to the D / A conversion means 26 and also to the calculation means 42.

  As shown in FIG. 11, the computing means 42 includes a difference computing unit 42a, an FFT computing unit 42b, a comparator 42c, and a reference value R4. The difference calculator 42a obtains an instantaneous error of the movable part operation with respect to the difference signal between the follow signal S1 and the control signal S2, and outputs a difference calculation result. The FFT computing unit 42b is a known computing unit for FFT analysis, and inputs a difference computation result and outputs an FFT analysis result. The comparator 42c outputs a recording start signal S4 to the recording means 17 starting from a point in time when a spectrum of a specific frequency in the FFT analysis result exceeds the reference value R4 and goes back for a certain period to be described later. To do.

  As shown in FIG. 12, the recording time selection means 43 has three types of recording time parameters T1 to T3, and these three types of time are selectively output to the recording means 17 as a recording time signal S9.

  The holding means 41 is a ring buffer volatile memory, temporarily holds the digital signal S6 of the follow signal S1, and outputs the oldest follow signal S1 while replacing the latest result. When the recording start signal S4 is input to the recording means 17, the recording of the digital signal S6 by the holding means 41 is started from the time point when the period set by the recording time signal S9 is retroactive. As in the previous embodiment, the main power of the lens apparatus is turned off and the above recording is completed.

  In the fourth embodiment, as the reference value R4, a specific frequency that is small in the normal operation and large in the abnormal operation can be selected and set, for example, a pulsation frequency during the abnormal operation.

  In the fourth embodiment, the detection target is not focused as an instantaneous value as in the previous embodiment, but can also be applied as an integral value having a certain time as in FFT analysis. Originally, if the measurement or calculation of instantaneous value, differential value, integral value, average value, etc. is possible, there is no time restriction on the detection target, so detection of an abnormal speed of the drive system may be used as a trigger for recording. .

  Furthermore, in the fourth embodiment, since the operation of the detection target is recorded based on the point in time when the pulsation exceeds the reference value R4 and goes back for a certain period, the malfunction of the detection target and the abnormal operation are recorded. It is possible to grasp from the operation before the precursor operation occurs. Therefore, it is possible to further facilitate the cause analysis of various problem operations to be solved. Parameters such as the recording end method and the sampling rate of the detection target may be set as appropriate according to the detection target.

  In addition, if such parameters are judged inside the lens and recorded while being changed as appropriate, it is possible to contribute to the efficiency of recording and the speed of various analyzes of detection targets. Further, a plurality of detection targets may be provided, and one or more detection targets may be recorded.

It is a block diagram of the lens apparatus of Example 1 of this invention. It is a functional block diagram of a drive means. It is a functional block diagram of a calculating means. FIG. 6 is a configuration diagram of a lens apparatus of Example 2. It is a functional block diagram of a control object selection means. It is a functional block diagram of a drive means. It is a functional block diagram of a calculating means. FIG. 6 is a configuration diagram of a lens apparatus of Example 3. It is a functional block diagram of a calculating means. FIG. 6 is a configuration diagram of a lens apparatus of Example 4. It is a functional block diagram of a calculating means. It is a functional block diagram of a recording time selection means. It is a conceptual diagram of the lens apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Lens 12 Zoom ring 13, 13 'Drive means 14 State detection means 15 Control means 16, 24, 31, 42 Calculation means 17 Recording means 21 Focus ring 22 Iris ring 23 A / D conversion means 25 Control object selection means 26 D / A conversion means 41 holding means 43 recording time selection means

Claims (10)

  A lens having a controllable movable part, a control means for the lens, a drive means for driving the movable part in response to a command from the control means, and a state detection means for detecting the state of the movable part and outputting a detection result And a recording means for recording the detection result, and a calculation means for preparing a reference value for each detection target of the state detection means and calculating a difference from the detection result of the detection target, wherein the difference is constant The broadcast television lens apparatus according to claim 1, wherein the recording means starts recording the detection result based on a time point when the value is exceeded.   A lens having a controllable movable part, a control means for the lens, a drive means for driving the movable part in response to a command from the control means, and a state detection means for detecting the state of the movable part and outputting a detection result And a holding means for outputting the oldest detection result while temporarily holding the detection result of the state detection means and replacing the latest detection result, and a record for recording the detection result output by the holding means And a calculation means for calculating a difference from a detection result of the detection target by preparing a reference value for each detection target of the state detection means, and retroactively extending a predetermined period from the time when the difference exceeds a predetermined value The broadcast television lens apparatus according to claim 1, wherein the recording means starts recording the detection result based on the point in time.   The broadcast unit according to claim 1, wherein the movable unit of the lens includes a zoom unit, a focus unit, or an iris unit, and the state detection unit outputs a drive signal or a follow signal of the movable unit. TV lens device.   The broadcast television lens according to any one of claims 1 to 3, wherein the calculation means calculates a difference between the reference value and a differential value or an integral value of a detection result of the detection target. apparatus.   The broadcast television lens apparatus according to claim 1, wherein the recording unit is capable of selecting a recording time for recording the detection result.   In a broadcast television camera system constituted by a broadcast television lens device and a television camera device connected to the television lens device to capture an image, a lens having a controllable movable part, a control means for the lens, and the control Drive means for driving the movable part according to a command from the means, state detection means for detecting the state of the movable part and outputting a detection result, recording means for recording the detection result, and detection target of the state detection means And a calculation unit that calculates a difference from the detection result of the detection target for each reference value, and the recording unit starts recording the detection result based on a point in time when the difference exceeds a certain value. TV camera system for broadcasting, characterized by   In a broadcast television camera system comprising a broadcast television lens device and a television camera device connected to the television lens device to capture an image, a lens having a movable portion, a control means for the lens, and a command from the control means Driving means for driving the movable part, state detection means for detecting the state of the movable part and outputting a detection result, and temporarily holding the detection result of the state detection means and inputting the latest detection result. In other words, a holding unit that outputs the oldest detection result, a recording unit that records the detection result output by the holding unit, and a reference value for each detection target of the state detection unit are prepared to detect the detection target. Calculation means for calculating a difference with a result, and based on a point in time when the difference has exceeded a certain value retroactively from a certain period, the recording means Broadcasting television camera system, characterized in that to start recording.   The broadcasting unit according to claim 6 or 7, wherein the movable unit of the lens includes a zoom unit, a focus unit, or an iris unit, and the state detection unit outputs a drive signal or a follow signal of the movable unit. TV camera system.   The broadcast television camera according to any one of claims 6 to 8, wherein the calculation means calculates a difference between the reference value and a differential value or an integral value of a detection result of the detection target. system.   10. The broadcast television camera system according to claim 6, wherein the recording unit is capable of selecting a recording time for recording the detection result.

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