JP2007293070A - Lens system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate a connection between a lens main body and a command means and prevent degradation in reliability even in photographing in which the lens main body and the command means are separated. <P>SOLUTION: The lens main body 20 is provided with a command signal conversion means 46 and a time-series positional signal conversion means 43. A demand side connected by a connector 44 and a connection cable 70 is provided with a time-series command signal conversion means and a positional signal conversion means. By decreasing the number of lines used in the connection cable 70, damage, etc., to the cable is decreased. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens system that drives and controls a zoom lens, a focus lens, an iris and the like by a plurality of command means.

  A control system for movable optical members such as a zoom lens and a focus lens in a conventional television lens is disclosed in Patent Document 1. In these control systems, a zoom demand which is a zoom drive command means and a focus demand which is a focus drive command means are connected to the lens body. As other demands connected to the lens body, those that output an iris command, those that control the image stabilizing optical system, and the like can be connected.

  The connection between the lens body and the demand is made through a cable connection using a multi-pin connector (Patent Document 1). The connector of Patent Document 1 has a 20-pin configuration, and the cable between the lens body and the demand is a 20-core cable having the same number of pins. Further, as shown in FIG. 1 of Patent Document 2, since the demand is operated in the vicinity of the lens main body, a cable between the lens main body and the demand of about 1 m is prepared as a standard.

  In the case of studio photography, there are cases where a TV camera, a TV lens, zoom demand, and focus demand are attached to a tripod for operation (tripod operation). In addition, there is a case where a cameraman is operated on the shoulder by using a combination of a TV camera and a TV lens without using the zoom demand and the focus demand (shoulder operation).

  FIG. 12 shows the above-described conventional lens system. A lens body 2 is connected to a camera body 1 having a built-in image sensor 1a. A zoom demand 3 and a focus demand 4 are connected to the lens body 2 via connectors 5 and 6 and cables 7a and 7b. The zoom demand 3 is command means for driving the zoom by the operation of the cameraman, and the focus demand 4 is command means for driving the focus by the operation of the cameraman.

  The lens body 2 is provided with an iris 2a, a zoom lens 2b, and a focus lens 2c as movable optical members. An iris motor 2d, a zoom motor 2d 'and a focus motor 2d "for driving these movable optical members, an iris potentiometer 2e, a zoom potentiometer 2e' and a focus potentiometer 2e" which are position detecting means are provided.

  The output signals A1, A2, and A3 of the potentiometers 2e to 2e "are read as position signals to the CPU 2h via the amplifiers 2f, 2f ', 2f", and the A / D converters 2g, 2g', 2g ", respectively. The pin assignments of the connectors 5 and 6 connected to the demands 3 and 4 are the same, and the demands 3 and 4 can be connected to any of the connectors 5 and 6.

  In addition, demand and lens connection interfaces include an analog type and a digital type. The analog type does not have a CPU in demand, and analog commands from a potentiometer or the like are output to the lens for zoom and focus commands. In addition, in the analog type demand, other function switches and indicator lights have interfaces with the number of lines corresponding to the number of the switches and indicator lights. Specifically, in FIG. 12, the analog type demand uses the power supply 2i, each analog command D1, D2, D3, each analog position E1, E2, E3, each switch command B1, and each switch answer C1 signal line. To do.

  On the other hand, a digital type demand is equipped with a CPU, and zoom, focus commands, switch commands, and indicator lamp controls that can be operated on demand are processed by the CPU, and serial data communication is performed between the demand and the lens. . Specifically, in FIG. 12, the digital type demand uses signal lines of power supply 2i, digital communication commands B2 and B3, and digital communication answers C2 and C3.

  Thus, since it is necessary to operate normally regardless of whether an analog type or a digital type demand is connected, the connectors 5 and 6 are pins that combine an analog type interface and a digital type interface. It has a layout. For this reason, the connectors 5 and 6 have a very large number of pins of around 20 pins.

  The above-described signal lines from the demands 3 and 4 through the connectors 5 and 6 are input to and output from the CPU 2h. The switch command signal B1 includes a return switch command signal for instructing video switching, a VTR switch command signal for instructing VTR start / stop, a shot storage command signal, a shot command signal, and the like. The shot command signal stores the zoom lens position and focus lens position and moves them to the storage position. Furthermore, digital communication command signals B2 and B3 from demands 3 and 4 are connected to the CPU 2h.

  Further, various position signals and switch answer signals C1 are sent to the demands 3 and 4 via the connectors 5 and 6 from the CPU 2h. When the connected demand is a digital type, various position signals and switch answer signals C1 are sent as digital communication answer signals C2 and C3. The power supply 2 i supplies power to the demands 3 and 4.

  Further, the iris analog command signal D1, the zoom analog command signal D2, and the focus analog command signal D3 are transmitted from the demands 3 and 4 through the connectors 5 and 6, respectively. These signals are connected to the CPU 2h via amplifiers 2j, 2j ', 2j "and A / D converters 2k, 2k', 2k", respectively.

  Further, the iris analog position signal E1, the zoom analog position signal E2, and the focus analog position signal E3 are supplied from the CPU 2h through the A / D converters 2m, 2m ′, 2m ″, the amplifiers 2n, 2n ′, 2n ″, the demand 3, 4 is connected.

  The CPU 2h performs calculations based on the command signals from the analog command signals D1 to D3, the digital communication command signals B2 and B3, and the position signals A1 to A3 from the potentiometers 2e to 2e ″. As a result, the motors 2d to 2d ″ are driven and controlled via the D / A converters 2o, 2o ′, 2o ″ and the amplifiers 2p, 2p ′, 2p ″.

Japanese Patent Laid-Open No. 2005-328496 JP-A-8-98062 JP 2000-115626 A

  In the above-described prior art, the lens body 2 and the demands 3 and 4 are connected by multi-core cables 7a and 7b having a length of about 1 m, and when connecting a plurality of demands, the number of cables corresponding to the demands. Therefore, various problems arise at the shooting site in the broadcasting station.

  For example, when a camera and a lens are installed at the tip of a crane of about 3 to 5 m, and the photographer operates the command means at the crane to perform crane shooting, the standard cable between the lens body 2 and the demand is long. Not enough. Therefore, it is necessary to manufacture and install a dedicated extension cable. The same applies when shooting a beast or the like away from a camera installed in nature.

  For this reason, cost and time are required for production and installation. In addition, since there are about 20 cores per cable and a large number of cores are used for the number of demands, there is a risk of contact failure or cable breakage during installation or modification work. There is also a problem of lowering.

  In addition, there is a demand for switching between tripod operation and shoulder operation according to the shooting situation. However, when using a tripod, the TV camera and TV lens can be removed immediately, but if you do not remove the zoom demand and focus demand cables from the TV lens, you cannot carry the shoulder. It cannot be switched immediately.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a lens system that facilitates installation work and connection work and does not deteriorate reliability even in shooting in a state where the lens body and the command means are separated. In particular, by greatly reducing the number of connection cables between the lens body and the command device, installation and modification work are made more efficient, eliminating the risk of contact failure and cable breakage, and providing high reliability and good operability. It is intended to be a system.

  Another object of the present invention is to provide a lens system capable of changing from a tripod operation to a shoulder support operation by simply removing the integrated TV camera and TV lens from the tripod.

  Technical features of the lens system according to the present invention for achieving the above object include a plurality of movable optical members, a plurality of position detection means for detecting positions of the plurality of movable optical members, and generating position signals; A lens device comprising a plurality of drive means for driving the plurality of movable optical members and a control means for controlling the drive means, and a plurality of instructions for generating a command signal for commanding the drive of the plurality of movable optical members The command signal and the position signal are transmitted via a first signal conversion unit connected to the plurality of command means and a second signal conversion unit connected to the lens device. The first signal conversion unit has time-series command signal conversion means for converting the plurality of command signals into one time-series command signal, and the second signal conversion unit A time-series position signal converting means for converting the position signals of a plurality of movable optical members into one time-series position signal, and a command signal converting means for converting the time-series command signal into the plurality of command signals, The first signal conversion unit includes position signal conversion means for converting the time-series position signal into the plurality of position signals, and the first signal conversion unit and the second signal conversion unit include the time-series command. A wireless communication means for wirelessly communicating a signal and the time-series position signal is provided.

  According to the lens system of the present invention, the plurality of command signals from the command means are converted into one time-series command signal, and the plurality of position signals are converted into one time-series position signal sequence, whereby the lens body and the command are transmitted. The number of cables and the number of core wires between the means can be reduced. Further, even if the lens body and the command means are separated from each other, it is possible to reduce the possibility of cable breakage and improve the reliability.

  Further, when the modulation / demodulation means is employed, a plurality of signals can be transmitted on one core wire. Further, when the modulation / demodulation means and the wireless means are adopted, a cable between the lens body and the command means becomes unnecessary, and there is no fear of cable breakage, the operability is improved and the reliability is improved. And command means can be used together.

  In addition, when the command means is operated by a battery, convenience is improved if it is possible to know whether operation is possible or not due to battery consumption. When operating the command means, in addition to the battery, an AC adapter can also be used as a power source.

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

  FIG. 1 is a configuration diagram of a television main body according to the first embodiment. A lens main body 20 is connected to a camera main body 10. Further, as shown in FIG. 2, a zoom demand 100 and a focus demand 110 are connected to the lens body 20 via a connection cable 70 and a signal conversion unit 80. The zoom demand 100 is command means for driving the zoom by the operation of the cameraman, and the focus demand 110 is command means for driving the focus by the operation of the cameraman.

  An image pickup device 11 such as a CCD is built in the camera body 10, and an image is formed on the image pickup device 11 through a movable optical member including an iris 21, a zoom lens 22, and a focus lens 23 of the lens body 20. .

  In order to drive these movable optical members, an iris motor 24, a zoom motor 25, and a focus motor 26 are provided. Further, an iris potentiometer 27, a zoom potentiometer 28, and a focus potentiometer 29 are provided as position detecting means for these movable optical members, but an encoder can be used as the position detecting means instead of the potentiometer.

  The analog signals M1, M2, M3 of the potentiometers 27 to 29 are connected as digital quantities to the CPU 36 in the lens body 20 via the amplifiers 30, 31, 32, and A / D converters 33, 34, 35. .

  Outputs from the CPU 36 to the demands 100 and 110 are connected to time-series position signal conversion means 43 via D / A converters 37, 38 and 39 and amplifiers 40, 41 and 42. The outputs of the D / A converters 37 to 39 and the amplifiers 40 to 42 are converted from the iris analog position signal N1, the zoom analog position signal N2, and the focus analog position signal N3 into the time series position signal SB by the time series position signal conversion means 43. To do.

  In addition, the time series position signal conversion means 43 converts each switch answer signal O1 and digital communication answer signals O2 and O3 input from the CPU 36 into a time series position signal SB. These time series position signals SB are connected to the demands 100 and 110 via the connector 44 and the signal conversion unit 80. A power supply means 45 is connected to the connector 44.

  The command signal conversion means 46 in the lens body 20 separates each command signal from the time-series command signal SA from the signal conversion unit 80 via the connector 44 and the connection cable 70 and outputs it to the CPU 36. That is, the CPU 36 captures the iris analog command signal P1, the zoom analog command signal P2, and the focus analog command signal P3 via the amplifiers 47, 48, 49 and the A / D converters 50, 51, 52. Further, the switch command signal Q1 and the digital communication command signals Q2 and Q3, which are switch information, are directly taken into the CPU.

  The CPU 36 performs a calculation based on the fetched iris / zoom / focus command signals and the iris / zoom lens / focus lens position signals M1, M2, and M3, and outputs them as command signals R1, R2, and R3. The digital command signals R1, R2, and R3 from the CPU 36 to the movable optical member are amplified into analog drive signals via the D / A converters 53, 54, and 55 and the amplifiers 56, 57, and 58, respectively. 24 to 26 are driven.

  A signal conversion unit 80 shown in FIG. 2 is connected to the lens body 20 via a connector 81 and a connection cable 70. The signal conversion unit 80 is provided with connectors 82, 83, and 84 having a multi-pin configuration of around 20 pins as in the prior art. Two of these connectors 82 to 84 are used to connect demands 100 and 110 that are command means, and a power supply means 85 is connected to the connectors 81 to 84 as a power source for each demand. .

  1 supplies power to the signal conversion unit 80, the zoom demand 100, and the focus demand 110. The power supply of the signal conversion unit is supplied via the connector 44, the cable 70, and the connector 81. Sent to supply 85.

  In the zoom demand 100, a return switch command signal, a VTR switch command signal, a shot command signal, and a shot storage command signal can be transmitted in addition to a zoom command for performing zoom drive control. In addition, the focus demand 110 can transmit a switch command signal equivalent to the zoom demand 100 in addition to a focus command for performing focus drive control.

  Signals are input from the demands 100 and 110 via the connectors 82, 83, and 84 to the time-series command signal conversion means 86 in the signal conversion unit 80. These signals are an iris analog command signal T1, a zoom analog command signal T2, a focus analog command signal T3, each switch command signal T4, and digital communication command signals T5 and T6. These signals are converted into a time series command signal SA by the time series command signal conversion means 86.

  Further, the time series position signal SB from the connector 81 is input to the position signal conversion means 87 in the signal conversion unit 80 via the connection cable 70. This time-series position signal SB is output by the position signal conversion means 87 by being divided into an iris analog position signal U1, a zoom analog position signal U2, a focus analog position signal U3, each switch answer U4, and digital communication answers U5 and U6.

  Thus, the lens body 20 is provided with the command signal conversion means 46 and the time series position signal conversion means 43, and the signal conversion unit 80 via the connection cable 70 is provided with the time series command signal conversion means 86 and the position signal conversion means. 87 is provided. With such a configuration, the number of signal lines of the connection cable 70 for connecting the lens body 20 side to the demands 100 and 110 is four as shown in FIG. Reduction is possible.

  FIG. 4 is a processing flowchart in the time-series command signal conversion means 86 of the signal conversion unit 80. The time-series command signal converter 86 generates a time-series command signal SA as a serial signal digitized at high speed. For this reason, the time-series command signal conversion means 86 includes an A / D converter for reading an analog command value.

  In S101, which is the start of processing, the return switch included in each switch command signal T4 from the demands 100 and 110 is read, and the result is output to the time-series command signal SA in S102. Next, in S103, the VTR switch included in each switch command signal T4 from the demand is read, and the result is output to the time-series command signal SA in S104.

  Subsequently, the shot storage switch included in each switch command signal T4 from the demand is read in S105, and the result is output to the time-series command signal SA in S106. Next, the shot command switch included in each switch command signal T4 from the demand is read in S107, and the result is output to the time-series command signal SA in S108. In S109, the iris analog command signal T1 from the demand 100 is read after A / D conversion, and the value is output to the time-series command signal SA in S110.

  In S111, the focus analog command signal T3 from the demand 110 is read after A / D conversion, and the value is output to the time-series command signal SA in S112. In S113, the zoom analog command signal T2 from the demand 100 is read after A / D conversion, and the value is output to the time-series command signal SA in S114. Next, the digital communication command signal T5 from the demands 100 and 110 is read in S115, and the command signal is output to the time series command signal SA in S116. In S117, the digital communication command signal T6 from the demands 100 and 110 is read, and the command is output to the time-series command signal SA in S118. Thereafter, the process returns to S101 and the same processing is repeated.

  Through the above processing, a plurality of command signals input from the plurality of demands 100 and 110 can be transmitted to the lens body 20 as one time-series command signal SA. FIG. 5 shows an explanatory diagram of the output time-series command signal SA based on the processing flowchart of FIG.

  FIG. 6 shows a process flowchart in the command signal conversion means 46 of the lens body 20. The command signal conversion means 46 returns the serial signal time series command signal SA digitized at high speed to the original various signal lines. Therefore, the command signal converting means 46 is configured with a D / A converter for outputting an analog command value.

  S200 represents the start of processing. In the next S201, the time series command signal SA is read. In S202, it is determined whether the time series command signal SA is a return switch command signal. If it is a return switch command signal, the process goes to S203. If so, the process proceeds to S204. In S203, the value is output to the return switch output line including each switch command signal Q1, and then the process returns to S201.

  Next, in S204, it is determined whether the read time-series command signal SA is a VTR switch command signal. If it is a VTR switch command signal, the process proceeds to S205, and if not, the process proceeds to S206. In S205, the value is output to the VTR switch output line included in each switch command signal Q1, and then the process returns to S201.

  In S206, it is determined whether or not the read time-series command signal SA is a shot storage command signal. If it is a shot storage command signal, the process proceeds to S207, and if not, the process proceeds to S208. In S207, the value is output to the shot storage output line included in each switch command signal Q1, and then the process returns to S201.

  Next, in S208, it is determined whether or not the read time-series command signal SA is a shot command signal. If it is a shot command signal, the process proceeds to S209, and if not, the process proceeds to S210. In S209, the value is output to the shot output line included in each switch command signal Q1, and then the process returns to S201.

  Next, in S210, it is determined whether or not the read time-series command signal SA is the iris analog command signal P1, and if the iris analog command signal P1, the process proceeds to S211; otherwise, the process proceeds to S212. In S211, the value is D / A converted and then output to the iris analog command signal P1, and then the process returns to S201.

  In S212, it is determined whether or not the read time-series command signal SA is the focus analog command signal P3. If the focus analog command signal P3, the process proceeds to S213, and if not, the process proceeds to S214. In S213, the value is D / A converted and then output to the focus analog command signal P3, and then the process returns to S201.

  In S214, it is determined whether or not the read time-series command signal SA is the zoom analog command signal P2. If the zoom analog command signal P2, the process proceeds to S215, and if not, the process proceeds to S216. In S215, the value is D / A converted and then output to the zoom analog command signal P2, and then the process returns to S201.

  In S216, it is determined whether or not the read time-series command signal SA is the digital communication command signal Q2. If the digital communication command signal Q2, the process proceeds to S217, and if not, the process proceeds to S218. In S217, the value is output to the digital communication command signal Q2, and then the process returns to S201.

  Next, in S218, it is determined whether or not the read time-series command signal SA is the digital communication command signal Q3. If the digital communication command signal Q3, the process returns to S219, and if not, the process returns to S201. In S219, the value is output to the digital communication command signal Q3, and then the process returns to S201.

By this processing, the time series command signal SA is returned to the original various command signals by the command signal conversion means 46 in the lens body 20. The processing in the time series position signal conversion means 43 is the same as the processing in the time series command signal conversion means 86 shown in FIGS. 4 and 5, and the processing in the position signal conversion means 87 is shown in FIG. This is the same as the command signal conversion means 46.
Further, the time series command signal conversion means 86 and the time series position signal conversion means 43 can be connected to either the analog type or the digital type connected. A plurality of interface lines (parallel signal lines, analog signal lines, and digital communication) between the lens and the demand are mixed to form one time series signal.

  Further, in the time series processing in the time series command signal conversion means 86 and the time series position signal conversion means 43 and the restoration processing from the time series signals in the command signal conversion means 46 and the position signal conversion means 87, processing cycles are used. Perform at high speed. As a result, the responsiveness and followability from the demand operation to the lens drive are maintained. Since the response of the lens requires a response of a maximum of several milliseconds (about 1 KHz), the time series conversion means may perform conversion at a sufficiently faster conversion cycle, for example, 100 KHz or more.

  In the first embodiment, even when the connection cable 70 is extended and laid, since the number of core wires is small, the possibility of damage to the connection cable 70 is reduced, and the reliability can be improved. The outer diameter of 70 becomes smaller and the operability is improved.

  In the description of the first embodiment, the command signal conversion unit 46 and the time-series position signal conversion unit 43 are provided in the lens body 20, but may be provided as separate adapters outside the lens body 20. Also in this case, the configuration of the adapter, the signal conversion unit 80, and the connection cable 70 are added to the conventional lens shown in FIG. There is less fear and reliability and operability are improved.

  In this embodiment, the signal conversion unit 80 is an adapter separate from the demands 100 and 110. However, the signal conversion unit 80 may be any one of the demands 100 and 110 as command means, and the same effect can be obtained in this case.

  Further, although the CPU 36, the command signal conversion means 46, and the time series position signal conversion means 43 are separate constituent blocks, they may be constituted by the CPU 36, and the same effect can be obtained. Further, although the iris 21, zoom lens 22, and focus lens 23 are shown as movable optical members, an extender lens, an image stabilizer lens, etc. can be considered as other optical members, and when these movable optical members are command controlled. Similar effects can be obtained.

  FIGS. 7 and 8 show the configuration of the second embodiment. In FIG. 7, a demodulating means 59, a modulating means 60, and an adding / splitting means 61 are added to the lens body 20 in FIG. Further, in FIG. 8, a modulation means 88, a demodulation means 89, and an addition demodulation means 90 are added in the signal conversion unit 80 with respect to FIG. In addition, the same code | symbol as FIG. 1, FIG. 2 has shown the equivalent member.

  In FIG. 7, the modulated signal via the connector 44 and the adding / separating means 61 is connected to the command signal converting means 46 as a time series command signal SA demodulated by the demodulating means 59. The time series position signal SB connected to the time series position signal converting means 43 and modulated by the modulating means 60 is superimposed on the power supply means 45 and connected to the connector 44. Further, in the signal conversion unit 80 of FIG. 8, modulation and demodulation are similarly performed by the modulation means 88 and demodulation means 89.

  The modulation means 60 modulates the time series position signal SB from the time series position signal conversion means 43. Further, the adding and sorting unit 61 superimposes the time series position signal SB modulated by the modulating unit 60 on the power supply unit 45 and outputs it to the connector 44. Further, the adding and sorting unit 61 classifies the time series command signal SA superimposed on the power supply unit 45, and the demodulating unit 59 demodulates the modulated time series command signal SA.

  With the above-described configuration, it is possible to superimpose the time-series command signal SA and the time-series position signal SB on the power supply means 45, and the required number of connection cables 70 is two as shown in FIG. The number of signal lines can be greatly reduced from about 20.

  FIGS. 10 and 11 show the configuration of the third embodiment. The connectors 44 and 81 and the connection cable 70 are omitted from the second embodiment shown in FIGS. Has been added. In the signal conversion unit 80, the connector 81 is omitted, and a wireless communication unit 91 and a power supply unit 92 are added. Further, the wireless communication means 62 and 91 may use standardized communication methods such as wireless LAN, Bluetooth, and Zigbee. The power supply means 92 supplies power to the signal conversion unit 80 and the demands 100 and 110 via the connectors 82, 83 and 84.

  After the time series command signal SA is modulated by the modulation means 88, it is wirelessly transmitted by the wireless communication means 91, is received by the wireless communication means 62 on the lens body 20 side, passes through the demodulation means 59, and is returned to the original time series. Returned to the command signal SA. Similarly, the time series position signal SB is transmitted / received from the wireless communication means 62 to the wireless communication means 91. Both wireless communication means 62 and 91 have address setting means. When the address setting means has the same address value, transmission / reception between the wireless communication means 62 and 91 becomes possible.

  In the third embodiment, the connection cable 70 between the lens body 20 and the signal conversion unit 80 is not necessary. Therefore, the switching from the tripod operation to the shoulder operation and the switching from the shoulder operation to the tripod operation can be immediately performed by detaching the camera body 10 and the lens body 20 which are integrated from the tripod, thereby improving the operability.

  The power supply unit 92 may include a power supply voltage detection unit (not shown) that outputs an alarm when the battery voltage drops during battery operation. Specifically, when the battery voltage starts to drop, the warning light can be blinked, and when the battery voltage drops, the warning light can be turned on. Thereby, the malfunction that operation of the lens main body 20 from the demands 100 and 110 suddenly becomes impossible at the time of battery operation can be prevented.

  Furthermore, it is possible to provide a power source switching means (not shown) in the signal conversion unit 80 and switch the operating power source according to the procedure. In addition to battery operation, the AC adapter can be used, and when the AC adapter is attached, the power supply from the AC adapter has priority over the battery. Thereby, even if the battery is consumed, the operation of the lens body 20 can be continuously performed from the demands 100 and 110 by using the AC adapter.

  According to this embodiment, since the plurality of command means are connected to the first signal conversion unit having the radio communication means and the power supply means, it is not necessary to provide the radio communication means and the power supply means for each command means. Therefore, the configuration of the lens system can be simplified.

  In this embodiment, the time-series command signal SA and the time-series position signal SB are modulated by the respective modulation means 88 and 60, then wirelessly communicated by the wireless communication means 62 and 91, and demodulated by the demodulation means 59 and 89. It is configured. The signal conversion unit may be simplified by wirelessly communicating the time-series command signal SA and the time-series position signal SB without performing the modulation by the modulation means 88 and 60 and the demodulation by the demodulation means 59 and 89.

  In each of the above-described embodiments, the configuration in which the time series position signal conversion unit 43, the power supply unit 45, the command signal conversion unit 46, the demodulation unit 59, the modulation unit 60, and the wireless communication unit 62 are built in the lens body 20 has been described. . However, even when these are configured to be attached to the lens body 20 as the second signal conversion unit, the same effect as when incorporated in the lens body 20 can be obtained.

FIG. 2 is a configuration diagram of a camera body and a lens body according to the first embodiment. It is a block diagram of a demand and a signal conversion unit. It is explanatory drawing of the signal allocation of a connection cable. It is a process flowchart figure in a time series command conversion means. It is explanatory drawing of a time series command signal. It is a process flowchart figure in a command conversion means. FIG. 5 is a configuration diagram of a camera body and a lens body of Example 2. It is a block diagram of a demand and a signal conversion unit. It is explanatory drawing of the signal allocation of a connection cable. FIG. 6 is a configuration diagram of a camera body and a lens body of Embodiment 3. It is a block diagram of a demand and a signal conversion unit. It is a block diagram of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera main body 11 Image pick-up element 20 Lens main body 21 Iris 22 Zoom lens 23 Focus lens 24 Iris motor 25 Zoom motor 26 Focus motor 27 Iris potentiometer 28 Zoom potentiometer 29 Focus potentiometer 36 CPU
43 Time-series position signal conversion means 44, 81, 82, 83, 84 Connector 45, 61, 92 Power supply means 46 Command signal conversion means 59, 89 Demodulation means 60, 88 Modulation means 61 Addition / fractionation means 62, 69 Wireless communication means 80 Signal Conversion Unit 86 Time Series Command Signal Conversion Unit 87 Position Signal Conversion Unit 90 Addition Demodulation Unit 100 Zoom Demand 110 Focus Demand SA Time Series Command Signal SB Time Series Position Signal

Claims (5)

A plurality of movable optical members; a plurality of position detecting means for detecting positions of the plurality of movable optical members; and a plurality of driving means for driving the plurality of movable optical members; and the driving means. A lens system having a control means for controlling, and a plurality of command means for generating command signals for commanding driving of the plurality of movable optical members,
The command signal and the position signal are communicated via a first signal conversion unit connected to the plurality of command means and a second signal conversion unit connected to the lens device,
The first signal conversion unit has time series command signal conversion means for converting the plurality of command signals into one time series command signal;
The second signal conversion unit includes time series position signal conversion means for converting position signals of the plurality of movable optical members into one time series position signal, and a command for converting the time series command signal into the plurality of command signals. Signal conversion means,
The first signal conversion unit has position signal conversion means for converting the time-series position signal into the plurality of position signals,
The lens system according to claim 1, wherein the first signal conversion unit and the second signal conversion unit include wireless communication means for wirelessly communicating the time-series command signal and the time-series position signal.   The lens system according to claim 1, wherein the first signal conversion unit includes a power supply unit that supplies power to the connected command unit.   The said 1st signal conversion unit has a voltage detection means to detect the voltage of the said power supply means, and outputs a warning, if the voltage of the said power supply means falls. Lens system.   4. The lens system according to claim 2, wherein the first signal conversion unit includes a power switching unit that switches a power source between the power supply unit and an external power source. 5.   The lens system according to any one of claims 1 to 5, wherein the first signal conversion unit and the second signal conversion unit include address setting means for wireless communication.

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