JP2000221381A - Photographing lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To drive control an optical means such as a lens to a target position even when the instruction data so as to excess a control range of a lens system are transmitted by providing a target position limit means limiting the target position inputted to a drive control means to the position within the prescribed range. SOLUTION: The drive of the lens by a camera command and a demand command is a servo mode, and the lens is moved between an (a) servo end 2802 of an INF side and a (b) servo end 2805 of a MOD side. Then, the position of the (a) servo end 2805 of the INF side is made 0, and the position of the (b) servo end 2805 of the MOD side is made 10000. Thus, the target position by the demand command becomes a value from 0 to 10000, and even when the demand command shows the value excepting 0-10000 in a sub-routine, the target position is constituted so as to be set in an L target making 0 or 10000 the target position. Thus, a command miss of inputted target positional information and a malfunction due to a noise are suppressed, and the optical means is stopped on the target position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing lens for a television used for photographing a television.

[0002]

2. Description of the Related Art Conventionally, in a television camera system for broadcasting, communication has been performed by analog signals as an interface between a camera and a lens. For example, focus
The voltage of the lens or the iris (IRIS) is determined, or the speed of the zoom lens is specified to the lens to control the lens system. Conversely, the focus lens, the zoom lens, the IRIS The lens information is transmitted by sending a voltage indicating the position to the camera.

A lens driving command value generated in the lens is generated based on a reference voltage generated in the lens so as to correspond to a reference fluctuation due to power supply fluctuation or environmental change (temperature change, etc.). With such a configuration, the lens driving command value does not exceed the recognition range of the lens system.

As described above, in a system in which a lens is driven by a command within a certain range, a camera or the like is specified to issue a command within this range. -Even if the control range of the system is exceeded, the lens system is configured to follow the control command.

Further, in analog signals, since the number of signal pins and the like and the accuracy of the control become limited as the number of control objects increases, a serial interface has recently been used as a communication function between a camera and a lens.

[0006]

However, in the above-mentioned conventional example using a serial interface as a communication function between the camera and the lens, the control range of the lens system is affected by a command error on the camera side or noise on the communication line. If command data that exceeds the limit is received from a camera or the like, the lens system may hit the machine end, generating a sound or making a dent.

Further, when a lens drive command is given as digital data using a serial interface, if command data exceeding the control range of the lens system is transmitted, the range which cannot be recognized by the lens system remains unchanged. Use may occur, and the lens system may hit the machine edge, producing noise or dents.

[0008]

A first configuration of a photographing lens apparatus according to the present invention comprises a movable optical unit, a driving unit for driving the optical unit, and a driving control unit for controlling the driving unit. Wherein the drive control means has target position limiting means for limiting the input target position to a position within a predetermined range.

A second configuration of the photographing lens device according to the present invention includes a movable optical unit, a driving unit for driving the optical unit, and a driving control unit for controlling the driving unit, and a camera device. In the photographing lens device used by being mounted on the camera device, the drive control unit includes a target position limiting unit that limits a target position input from the camera device to a position within a predetermined range.

In a third configuration of the photographic lens device according to the present invention, the predetermined range is set within a mechanically movable range of the optical member.

According to a fourth configuration of the photographic lens device of the present invention, when the target position is not a position within the predetermined range, the target position is set to an outermost position within the predetermined range closest to the target position. The position is replaced.

A fifth configuration of the photographing lens device according to the present invention includes a driving unit that drives the optical unit within a predetermined range in accordance with data of a predetermined range, and sets data indicating a driving position. In a photographing lens device that drives an optical unit to a position corresponding to the data by a driving unit based on data from a setting unit, when data set in the setting unit is data having a value outside the predetermined range, A change means for changing the data to a value within the predetermined range is provided, and when the data is data having a value outside the predetermined range, the driving means is driven in accordance with the changed data.

According to a sixth aspect of the present invention, in the fifth aspect, in the fifth aspect, the data in the predetermined range includes a first value and a second value larger than the first value. When the data indicating the drive position from the setting means indicates a value smaller than the first value, the changing means changes the set data to the data of the first value. Below.

According to a seventh aspect of the present invention, there is provided a photographic lens device according to the fifth or sixth aspect, wherein the data indicating the drive position from the setting means indicates a value larger than the second value. The changing means changes the set data to the data of the second value.

An eighth configuration of the photographing lens device according to the present invention, in the fifth, sixth or seventh configuration, wherein the setting means sets the data representing the lens driving position in a range exceeding the predetermined range. It is something to set.

[0016]

(First Embodiment) FIGS. 1 and 2
4 shows the first embodiment of the present invention, and FIG. 3 is a flowchart showing a main routine of the operation of the present embodiment. FIG. 6 shows a subroutine of step 304 in FIG.
7 is a subroutine of Step 608 in FIG. 7 (a flowchart of FIG. 8 showing a modification thereof), and the subroutine of Step 605 in FIG. This is a characteristic process of the embodiment. And this Large Lm
The processing of t is shown in the flowchart of FIG.

FIG. 1 is a block diagram of an optical device showing a first embodiment of the present invention. Reference numeral 101 denotes a lens unit for photographing, and reference numeral 120 denotes a camera unit for photographing through the optical system of the lens unit 101.

Reference numeral 102 denotes a first control device (hereinafter abbreviated as aCPU) for managing the lens unit 101 and controlling the servo system; 103, a timer for the aCPU 102 to manage the system of the lens unit 101; 106 is an optical lens connected to the motor 105, 107 is an encoder for detecting the position of the optical lens 106, and 107 is an encoder 106
This is a counter for counting the output from.

Reference numeral 109 denotes a manual operation unit for manually moving the optical lens 106. Counter 108 and timer 10
3 is connected to the aCPU 102,
Reference numeral 102 indicates the position and speed of the optical lens 106 by using the value of the counter 108 and the value of the timer 103.

Reference numeral 110 denotes a start switch (START-SW) for starting driving of the optical lens 106, and reference numeral 111 denotes a display unit for indicating the state of the lens unit 101.

Reference numeral 112 denotes a local / remote selection switch (selecting whether to control the lens unit in a remote mode (mode performed by a command on the camera side) or a local mode (mode performed by a command on the lens side). R /
L-SW), and 113 is a rewritable non-volatile memory (EERPORT) that holds data to be used in the lens unit 101.

Reference numeral 130 denotes a demand for requesting control of the optical lens 106. In the camera unit 120,
A second control device (hereinafter abCPU) 121 is mounted, and serial communication can be performed with the aCPU 102 of the lens unit 101 via the serial communication line 140.

Here, the remote mode and the local mode by the R / L-SW 112 will be described.

In the remote mode, the optical lens 106 is controlled by a control command from the bCPU 121 of the camera unit 120.
And the local mode is demand 1
In some cases, the control command from 30 is selected to drive the optical lens 106.

Next, the moving direction of the optical lens 106 and the count value of the counter 108 will be described with reference to FIG. 2 using a focus lens.

Here, the INF (infinity) end 201 of the focus lens is set to a counter value 0, and the MOD (closest) end 2
02 is set to 10000. Focus lens is C
When rotated in the W direction, it is counted up and MOD
Direction and rotate in the CCW direction, count down and move in the INF direction. For example, the current position is Lpos203, the counter value at that position is 2000, and the movement target position is Lta.
rget 204, and the counter value at that position is 7000
In this case, the movement amount Lrest is given by the following equation.

Lrest = Ltarget−Lpos = 7000−2000 = 5000 Therefore, in this case, since Lrest> 0, the focus lens moves 5000 from the current position in the MOD direction, and the rotation direction is CW. Also Lrest
If <0, the rotation direction is CCW, and the speed of the lens assumes a negative value while rotating in the CCW direction.

Next, the lens system will be described with reference to a flowchart. In this lens system, it is assumed that serial communication uses an interrupt.
First, the main processing shown in FIG. 3 will be described.

In step 301, power is turned on to the lens unit 101. Subroutine PonIn in step 302
It is called to initialize the lens unit 101. When the initialization is completed, in step 303, the current time T1 and the current position Lpos of the lens are input.

In step 304, the subroutine Len
sModeSet is called to check whether a lens driving command is present.

In step 305, the subroutine Len
In sModeSet, the flag fReadyLensCmd is checked for the presence / absence of a lens drive command to be set.

If it is determined in step 305 that there is a lens drive command (if fReadyLensCmd = 1), the flow advances to step 306 to set a subroutine SetLe.
Call nsDir and set the driving direction from the current position of the lens.

Next, it is checked in step 307 whether the lens is being driven. If the lens is stopped (fL
If ensOnDrive = 0, the process proceeds to step 311 to call the subroutine CheckDeadZone and check the drive dead zone.

Subroutine CheckDeadZone
In, the result of examining whether it is in the drive dead zone,
In step 312, the flag fDriveStart
Judge by

If it is determined in step 312 that there is no drive permission (if fDriveStart = 0), the flow returns to step 303, and if it is determined that drive has been permitted (if fDriveStart = 1),
Proceeding to step 313, a subroutine PrepDrive is called to set driving start data,
When the setting is completed, the subroutine Len is executed in step 314.
Call sDriveStart to start driving the lens.

When the lens drive is started, step 3
At 15, the lens is driven and controlled by PID control.

Here, the PID control is a general proportional / integral
Since the differential control is performed and is different from the gist of the present invention, the description is omitted. Further, in consideration of the case where the PID control is performed by controlling the sampling period to be constant by digital control, it is also possible to perform the PID control by interrupt processing using a timer interrupt.

In step 316, a subroutine Ch is performed to determine whether the lens has reached the target position.
Call kLensStopPos.

At step 317, the flag fReachStopPo is determined in order to determine whether or not the arrival has been reached.
Examine s.

When it is determined that the target position has been reached (fR
(if stopStopPos = 1), step 320
The subroutine ReachPos is called to perform target position reaching processing. When the target position reaching process is completed in step 320, the process returns to step 303. If it is determined in step 317 that the target position has not been reached (if fReachStopPos = 0), the flow advances to step 318 to execute the subroutine CheckLensSts.
To check the lens over-error condition.

In step 319, the result checked in the subroutine CheckLensSts in step 318 is determined by the flag fLensStsErr.

If it is determined in step 319 that an over error condition has occurred (if fLensStsErr = 1), the flow advances to step 321 to call a subroutine OverError to perform an over error process. Upon completion of the process, the process returns to the step 303.

If it is determined in step 319 that the state is not an excessive error state (when fLensStsErr = 0), the process returns to step 303.

When it is determined in step 305 that there is no lens drive command (fReadyLens
If Cmd = 0), the process proceeds to step 308, where it is determined whether the lens is being driven or stopped by checking the flag fLensOnDrive.

If it is determined in step 308 that the operation is stopped (if fLensOnDrive = 0), step 3
Return to 03. When it is determined that driving is being performed (fLensOn)
If Drive = 1), the process proceeds to step 315 to continue PID control.

In step 307 described above,
When it is determined that the lens is being driven (fLensO
If nDrive = 1), the process proceeds to step 309, where the subroutine CheckDriveCmd is called, the current driving direction is compared with the new driving command, and it is checked whether there is any contradiction in the driving direction.

In step 310, the result of the check is set to the flag fL.
It is determined by ensOnDrive.

Subroutine Ch due to inconsistency in the driving direction
If the lens is stopped in ckDriveCmd, it is determined that the lens is stopped in step 310 (if fLensOnDrive = 0), so step 3
Proceeding to 11, the lens is driven again based on the new command.

If it is determined in step 310 that driving is being performed (if fLensOnDrive = 1), the subroutine CheckDrive in step 309 is selected.
Since it is determined by eDir that there is no inconsistency in the driving direction, the process proceeds to step 315, and the lens is continuously driven by PID control.

Next, the characteristic processing of this embodiment in FIG. 3 will be described below with reference to FIGS. 22, 23 and 24.

Using the subroutine LocalC with reference to FIG.
mdIn will be described. This subroutine corresponds to the LensModeSe of FIG. 6 processed in step 304 of FIG.
It is read when the local mode is set in step 605 of t. Demand 1 in step 2201
The demand command from 30 is input. Step 2202
Then, the focus / lens position command DemandPos is calculated from the input demand command. This is a correction because the demand command does not always coincide with the lens movement amount. For example, when an A / D converter (10 bits) is used when performing demand input, the range of the A / D converter is 0 to 1024. However, the entire range of movement of the focus lens is 0 to 10,000. Therefore, DemandPos = A / D conversion value × 10000/10
DemandPos may be calculated using the conversion formula 24.

In step 2203, it is determined whether the lens is in the manual mode or the servo mode. The servo·
In the case of the mode (when fLensManual = 0),
Proceeding to step 2204, the target speed DemandRpm
Is set to the temporary speed TempLensRpm.

In step 2205, the focus position command DemandPos is changed to the stop target position Ltarget.
In addition, the target speed DemandRpm is changed to the command speed DemRp
m and used as lens control signals. Step 22 to check its scope
In step 06, the subroutine LTargetLmt is called.

In step 2207, it is determined that the lens control command is ready, and the flag fReadyLens is set.
Cmd = 1, and the subroutine LocalCmdIn ends.

If it is determined in step 2203 that the mode is the manual mode (if fLensManual = 1), in step 2208, the demand operation amount is calculated by the following equation.

DemandMove = ABS (DemandPos−DemandManu) (22) In step 2209, the demand operation amount DemandMove calculated by the equation (22) is compared with the manual mode release demand operation amount DemandServo by the following equation. .

DemandMove ≧ DemandService (23) In step 2209, when the expression (23) is satisfied, it is determined that the demand operation amount is sufficient, the process proceeds to step 2211, the flag fLensManual = 0 is set, and the servo control is performed. Set the mode. Then, the process proceeds to step 2204.

If the expression (23) is not satisfied in step 2209, the demand operation amount is not sufficient and the manual mode is not released. Therefore, in step 2210, the flag fReadyLensCmd = 0 is set, and the subroutine LocalCmdIn ends.

A subroutine Ltarget will be described with reference to FIG.
A description will be given of tLmt.

In step 2901, the lower limit of the stop target position Ltarget is checked by the following equation.

Ltarget ≧ 0 (30) If Expression (30) is not satisfied in Step 2901, the lower limit is exceeded, and in Step 2903, 0 is set to the target stop position Ltarget, and The subroutine LtargetLmt ends.

If Expression (30) is satisfied in Step 2901, the upper limit is checked in Step 2902 by the following expression.

LTarget ≦ 10000 (31) When Expression (31) is not satisfied in Step 2902,
In step 2904, 10000 is set as the stop target position Ltarget, and the subroutine LtargetL is set.
mt ends.

In step 2902, the equation (31)
Is satisfied, the stop target position Ltarget is within the lens control range, and therefore is used as it is.
The subroutine LtargetLmt ends.

Here, the end processing will be described with reference to FIG.

As preconditions, the INF end is set to 0, M
Although the OD end is assumed to be 10000 and the movement position of the focus lens is assumed, this may be a value at which the focus lens actually moves. On the other hand, the actual movement amount may differ depending on the lens. It may be a value normalized by agreement between the unit and the camera unit.

Further, as the initialization data, the values of the INF end and the MOD end may be exchanged using communication between the lens unit and the camera unit.

That is, the value of the position of the focus lens is MOD based on the INF end (for example, 0).
By transferring the information of taking the value of the edge (for example, 10000) from the lens unit to the camera unit, the camera unit can determine which position the focus lens wants to move. .

The movable range of the focus lens is as shown in FIG. That is, on the INF side, there are a mechanical end 2801, a servo end 2802, and a optical end 2803, and similarly on the MOD side, the b mechanical end
04, b servo end 2805, b optical end 2806.

The reason why the range in which the lens can be moved with respect to the optical end is wide because a margin is provided in order to satisfy the specification data even if there is a manufacturing error.
Therefore, when the lens is operated with the manual operation unit, the INF
Side can be moved between the mechanical end 2801 on the side MOD and the mechanical end 2804b on the MOD side.
Side a servo end 2802 and MOD side b servo end 280
5 can be moved.

Further, since the driving of the lens by the camera command or the demand command is in the servo mode, a
It moves between the servo end 2802 and the b servo end 2805 on the MOD side.

Here, the position of the a servo end 2802 on the INF side is 0, and the position of the b servo end 2805 on the MOD side is 10
000.

Therefore, the target position according to the demand command needs to be a value from 0 to 10000. Therefore, even if the demand command indicates a value other than 0 to 10000 in the above subroutine LtargetLmt, the target position is set to 0 or 10000 in Ltarget.

Thus, the demand command is changed from 0 to 1
Even if a value other than 0000 is indicated, the target position is 0.
Alternatively, since 10000 is set in Ltarget, steps 316 to 320 in FIG.
In the subroutine CheckLensStopPos and ReachPos of FIG.
The lens is driven up to et. The above operation is a demand command, but a command from a camera is similarly processed.

Next, processing other than the characteristic processing of the present embodiment described above with reference to FIG. 3 will be described.

In FIG. 14, the subroutine CheckLen
sStopPos will be described.

At step 1401, the current driving direction is checked. When the driving direction is CW (MOD direction) (fDrv
If CwCcw = 1), the process proceeds to step 1402, and a stop position LstopPos for actually stopping from the stop target position Ltarget is calculated by the following equation.

LstopPos = Ltarget−StopOffset (6) This is for the purpose of stopping the lens slightly shortly before stopping the lens in order to prevent overrun due to inertia or delay in position sampling. Then, in step 1403, LstopPos and the current position L
Pos is compared with the following equation.

Lpos ≧ LstopPos (7) If Expression (7) is satisfied in Step 1403, it is determined that the lens has reached the target stop position, and Step 1406 is reached.
To the stop target position reaching flag fReachPosS
Top = 1, subroutine CheckLensSt
End opPos.

If the formula (7) is not satisfied in step 1403, it is determined that the lens has not reached the stop target position, the flow advances to step 1407, the stop target position reaching flag fReachPosStop = 0 is set, and the subroutine C
end the checkLensStopPos. Here, the driving direction in step 1401 is CCW (I
In the case of (NF) (if fDrvCwCcw = 0), the process proceeds to step 1404, and the stop position LstopPos for actually stopping from the stop target position Ltarget is calculated by the following equation in order to prevent overrun of the lens as described above. .

LstopPos = Ltarget + StopOffset (8) In step 1405, LstopPos is compared with the current position LPPos by the following equation.

Lpos ≦ LstopPos (9) If Expression (9) is satisfied in Step 1405, it is determined that the lens has reached the target stop position, and Step 1406 is reached.
To the subroutine Ch
End eckLensStopPos.

If the expression (9) is not satisfied in step 1405, the flow advances to step 1407 to execute the same processing as described above and to execute the subroutine CheckLensStop.
Exit Pos.

Referring to FIG. 15, subroutine Reach
Pos will be described.

Since the stop target position has been reached, step 1
At 501, the lens is stopped. And step 1502
To set the lens drive flag fLensOnDrive = 0, and to set the stop target position reaching flag fTargetGetPos =
Let it be 1.

In step 1503, the mode of the lens is checked. In remote mode (fRemoteLoc
If al = 1), in step 1504, the target position arrival flag (fTargetPos = 1) is transferred to the camera unit using serial communication.

Further, at step 1505, a display indicating that the target position has been reached is displayed, and the subroutine Reac
Exit hPos. If it is determined in step 1503 that the mode is the local mode (fRemoteLocal
In the case of = 0, the process proceeds to step 1505, and the same processing is performed thereafter, and the subroutine ReachPos ends.

In the subroutines of FIGS. 14 and 15, the lens is driven to the position set to Ltarget as described above.

Next, an interrupt process by serial communication will be described with reference to FIG. When a serial communication interrupt occurs from the camera unit 120, the subroutine Serial
Jumping to lInt, a lens control command is input in step 401.

In step 402, it is checked whether the lens control command is a position and speed command. If it is determined that the command is a position and speed command, the process proceeds to step 411, where the camera position command is set to CmdPos as a position command, and the camera speed command is set to CmdRpm as a target speed. Then, the process proceeds to a step 409, where a flag fLensCmdIn = 1 is set assuming that a lens drive command has been issued.
Then, the subroutine SerialInt ends.

If the condition is not satisfied in step 402, the flow advances to step 403 to check whether the lens control command is only a speed command.

If it is determined that only the speed command is issued, the flow advances to step 404 to check the sign of the speed command. MO if positive
Since it is a command to move in the D direction, the camera position command is set at the MOD end in step 405, and the process proceeds to step 411.

If the condition is not satisfied in step 404, it is determined to be negative. In step 406, the INF end is set as a camera position command, and the flow advances to step 411. If the condition is not satisfied in step 403, the process proceeds to step 407 to check whether the lens control command is only a position command. If it is determined that the lens control command is only the position command, the process proceeds to step 408, and a temporary speed command TempLensRpm is set as the camera speed command. Then, the process proceeds to step 411.

If the condition is not satisfied in step 407, it is determined that there is a contradiction in the lens control command, and the flow advances to step 410. In step 410, the flag fLens
It is assumed that CmdIn = 0 and there is no lens drive command. Then, the subroutine SerialInt ends.

A subroutine PonInit will be described with reference to FIG.
Will be described. This subroutine performs an initialization process. First, in step 501, a flag is initialized.

FLensManual = 0 (servo mode setting) fLensOnDrive = 0 (during lens stop) fLensCmdIn = 0 (no lens control command input) fRemoteLocal = 0 (local mode) fTargetPos = 0 (clear target position arrival) Step At 502, data is initialized.

Setting of provisional speed command TempLensRpm = 100 [RPM] Manual mode release demand operation amount in local mode DemandService = 1000 Next, in step 503, the subroutine Lens
Call PosInit to initialize the lens position. If the encoder cannot use the one that outputs an absolute value, the absolute value of the lens is unknown when the power is turned on if the encoder that uses the absolute value output is used. In order to determine the absolute position of the lens, although not shown, the contents of the subroutine LensPosInit include, for example, INF
If a switch is provided at the end, set the focus lens to IN
By moving in the direction F and stopping where the switch is turned on, the end of the INF can be known.

Here, if the counter is set to 0, IN
With the F end set to 0, the absolute position of the focus lens can be detected. When the initialization of the lens system is completed, serial communication is permitted in step 504.

Referring to FIG. 6, subroutine LensMo will be described.
The deSet will be described.

At step 601, the state of the R / L-SW is checked. If it is on, it is determined that the remote mode is set, and the remote / local setting flag is set to fRemoteLocal = 1 in step 606. Next, in step 607, data for the remote mode is set.

Setting of Drive Dead Zone Amount DriveDeadZone = 8 Setting of Stop Offset StopOffset = 4 Setting of Maximum Lens Speed LensMaxRpm = 80 Then, the process proceeds to step 604 to check the remote / local setting state.

In the case of the remote mode (fRemote
In the case of Local = 1), the process proceeds to step 608, calls the subroutine RemoteCmdIn1, and then ends the subroutine LensModeSet.

If the R / L-SW is turned off in step 601, it is determined that the mode is the local mode, and the flow advances to step 602 to set the remote / local setting flag to fR.
It is assumed that remoteLocal = 0. And step 60
In step 3, data for the local mode is set.

Setting of Drive Dead Zone Amount DriveDeadZone = 10 Setting of Stop Offset StopOffset = 5 Setting of Maximum Speed of Lens LensMaxRpm = 50 Then, the process proceeds to step 604.

If it is determined in step 604 that the mode is the local mode (fRemoteLocal)
= 0), the process proceeds to step 605 and the subroutine Lo
After calling calCmdIn, subroutine Len
The sModeSet ends.

Here, by making it possible to change the data of the dead zone amount, the stop offset, and the maximum speed in the remote mode and the local mode, it is possible to output the characteristic feature of the lens movement in each mode.

That is, in the remote mode, high performance is required for the movement performance of the lens. Therefore, high sensitivity data is set. In the local mode, low sensitivity data is set. Energy saving of the motor drive current can be achieved.

Referring to FIG. 7, subroutine RemoteC is used.
mdIn1 will be described.

In step 701, START-SW11
Check the status of 0. When SW110 is off,
Proceeding to step 704, the input state of the lens drive command is checked. If there is no command value (if fLensCmdIn = 0), it is determined in step 710 that the lens control command is not in the valid state, and the flag fReadyLensCmd = 0. Then, the subroutine RemoteCmdIn1
To end.

Also, in step 701, START-S
If W110 is on, the flow advances to step 702 to set the flag fLensManual = 0 to set the lens to the servo mode. In order to notify the camera of this lens state, fL
An ensManual flag (servo mode state) and START-SW on information are transferred. Then, the process proceeds to step 704.

If it is determined in step 704 that there is a command value (if fLensCmdIn = 1), in step 705, the position command (CmdPos) is set to the stop target position Ltarget, and the target speed (CmdRp
m) is set to the command speed DemRpm and used as a lens control signal.

Since the command value has been used as the control signal, the flow advances to step 706 to call the subroutine LTargetLmt to check the effective range. Then, in step 707, the flag f is input for the next command input.
Let LensCmdIn = 0.

In step 708, manual mode release (servo mode setting) by camera command is performed.
Let fLensManual = 0. Step 70
At 9 it is determined that the lens control command is in the valid state and the flag f
ReadyLensCmd = 1. Then, the subroutine RemoteCmdIn1 ends.

In the subroutine RemoteCmdIn1, the manual mode is released (servo mode setting) by turning on the START-SW 110 or a lens control command from the camera. However, as another embodiment, the START-SW 110 is turned on. The case of performing only this will be described with reference to FIG. Here, the name of this subroutine is RemoteCmdIn2.

First, in step 801 the START-SW
Check if 110 is on. If it is on, the flag fLensManu is set in step 802.
Let al = 0 (servo mode). In order to inform the camera of this information, the fLensManual flag (servo mode state) and the START-SW on information are transferred using serial communication in step 803.
Then, the process proceeds to step 804.

If it is determined in step 801 that the SW 110 is off, the process proceeds to step 804. In step 804, it is checked whether a lens command has been received from the camera. If there is no command value input (fLensCmdIn = 0), the process proceeds to step 809, where the flag fReadyLensCmd = 0 is set as the lens control command is not valid. Then, the subroutine RemoteCmdIn2 ends.

In step 804, when there is a command value input (fLensCmdIn = 1), step 805 is executed.
In, the position command (CmdPos) is set to the stop target position Ltarget, and the target speed (CmdRpm) is set to the command speed DemRpm, and used as a lens control signal.

Since the command value has been used as the control signal, the process proceeds to step 806 to check the effective range, and calls the subroutine LTargetLmt. Then, the flag f is set at step 807 for the next command input.
Let LensCmdIn = 0.

Then, at step 808, the lens is
Mode is checked, and the mode is the manual mode (f
If it is determined that (LensManual = 1), the process proceeds to step 809. In the servo mode (fLen
If sManual = 0) is determined, step 81
0 indicates that the lens control command is in the valid state
ReadyLensCmd = 1. Then, the subroutine RemoteCmdIn2 ends.

Referring to FIG. 9, a subroutine SetLen
sDir will be described. In step 901, the current position L
Moving distance L from pos to stop target position Ltarget
rest is calculated by the following equation. Lrest = Ltarget-Lpos (1) In step 902, the moving direction is checked based on the sign of Lrest. If Lrest> 0, the rotation in the CW (MOD) direction proceeds to step 906, where the sign of the command speed DemRpm is made positive by the following equation.

DemRpm = ABS (DemRpm) (2) Here, ABS (X) takes the absolute value of X.
Then, in step 905, the flag indicating the rotation command in the CW (MOD) direction is set to fDemCwCcw = 1, and the subroutine SetLensDir ends. Step 90
If Lrest is negative in step 2, the routine proceeds to step 903, where the sign of the command speed DemRpm is made negative by the following equation.

DemRpm = −ABS (DemRpm) (3) Then, the process proceeds to step 904, where a flag indicating a rotation command in the CCW (INF) direction is set to fDemCwCcw = 0,
The subroutine SetLensDir ends.

The subroutine CheckD will be described with reference to FIG.
liveCmd will be described. In step 1011, the speed command DemRpm is checked. If the speed command DemRpm = 0, it is regarded as a lens stop request command, and
Proceed to 12, and stop the lens. And step 10
At 13, the driving flag fLensOnDrive is set to 0, and the subroutine CheckDriveCmd is ended. In step 1011, the speed command DemRp
If m ≠ 0, the process proceeds to step 1001. Step 10
At 01, the rotation request direction according to the latest command is checked. If the flag fDemCwCcw is 1 (a rotation request in the CW direction), the process proceeds to step 1003, and the current rotation request direction of the lens is checked. When fDrvCwCcw = 1, the lens is currently requesting rotation in the CW (MOD) direction.
Since they match, the subroutine CheckD
end liveCmd.

In step 1003, fDrvCwC
If cw = 0, the command does not match because the lens is currently CCW (INF), so the flow advances to step 1004 to stop the lens. Step 10 because it stopped
05, the driving flag fLensOnDrive = 0
In step 1006, a delay for stabilizing the stop is performed. This is a measure for preventing vibration due to sudden reversal of the lens because a movement command in the direction opposite to the current driving direction is received. If this delay is too long, the response to the command is deteriorated. Therefore, considering the mechanical time constant, 20 to 50 [msec
c) is good.

After taking the delay in step 1006,
The subroutine CheckDriveCmd ends.
In step 1001, the flag fDemCwCcw =
If 0 (rotation request in CCW direction), step 1002
To check the current required rotation direction of the lens. fDr
If vCwCcw = 0, the current lens is CCW (IN
F) Since it is requesting rotation in the direction, it matches, so
The subroutine CheckDriveCmd ends as it is.

In step 1002, fDrvCwCc
If w = 1 (rotation request in CW direction), the current lens is C
Since the commands do not match because of W (MOD), the process proceeds to step 1004, and thereafter, the processing is as described above.

The subroutine CheckD will be described with reference to FIG.
The eadZone will be described.

In step 1111, the speed command DemRp
Examine m. When the speed command DemRpm = 0, the process proceeds to step 1102 because the driving start permission is not given. If the speed command DemRpm ≠ 0, the process proceeds to step 1101. In step 1101, the magnitude of the movement amount Lrest from the current position Lpos to the target stop position Ltarget is checked by the following equation.

DriveDeadZone ≧ ABS (Lrest) (4) When Expression (4) is satisfied, since the lens movement amount Lrest is equal to or less than the dead zone DriveDeadZone, no drive start permission is given. The drive start permission flag fDriveStart = 0 is set, and the subroutine CheckDeadZone is ended.

If the equation (4) is not satisfied at step 1101, the lens movement amount Lrest is set to the dead zone Drive.
Since it is equal to or greater than DeadZone, the drive start permission flag fDriveStart = 1 is set in step 1103 to give the drive start permission, and the subroutine C
end the hookDeadZone.

Subroutine PrepDr will be described with reference to FIG.
ive will be described.

In step 1201, the current lens position L
Set pos as follows:

Speed calculation position buffer Lpos0 = Lpos Stop detection position buffer Lstop0 = Lpos In step 1202, the current time T1 is set as follows to detect an excessive error.

Stop detection timer buffer Tstop0 = T1 Reverse movement detection timer buffer Tinv0 = T1 Speed error abnormality detection timer buffer Trpm0 = T1 In step 1203, a set of over error detection reference timer and the like is set as follows. To do.

Stop detection reference time buffer TstopStd = 100 [msec] Reverse movement detection reference time buffer TinvStd = 100 [msec] Speed error abnormality detection reference time buffer TrpmStd = 100 [msec] Speed error abnormality detection ratio reference buffer RpmErrRatio = 70 [%] When the initialization of each data is completed, step 120 is executed.
In step 4, the over error detection display and the target position arrival display are turned off.
Then, in step 1205, the target position reaching flag fTa
rgetPos = 0 and subroutine PrepDri
Exit ve.

Referring to FIG. 13, subroutine LensDr is used.
iveStart will be described.

At step 1301, a flag fLensOnDrive is set to indicate that the lens is being driven.
= 1. In step 1302, the command speed DemR
pm is the maximum speed of the lens system LensMaxRp
It is checked by the following equation whether m does not exceed m.

LensMaxRpm ≧ DemRpm (5) If Expression (5) holds, the flow advances to step 1304. If equation (5) is not satisfied, step 1303
To change the value of LensMaxRpm to the command speed DemR.
pm and proceed to step 1304.

In step 1304, the direction of the drive request is checked. When the drive request is CW (fDemCwCcw =
In the case of 1), in step 1305, the lens starts to be driven in the CW direction at the command speed DemRpm. Then, in step 1306, a flag fDrvCwCc indicating the driving direction is set.
w = 1, subroutine LensDriveStar
Terminates t.

If there is a drive request in the CCW direction in step 1304 (when fDemCwCcw = 0),
In step 1307, the lens is moved to the command speed DemRpm
To start driving in the CCW direction. And step 1308
Then, a flag fDrvCwCcw = 0 indicating the driving direction is set, and the subroutine LensDriveStart is ended.

Referring to FIG. 16, subroutine Check
A description of LensSts will be given.

At step 1601, the subroutine Ca
Call lcRpm to calculate the current lens speed.
Next, in step 1602, the subroutine CheckS
Top is called to check the stop state of the lens. In step 1603, a subroutine CheckDir is called to check whether the driving direction of the lens and the actual rotation direction are the same. In step 1604, a subroutine CheckRpm is called to check the current speed state.

Here, the flags set in each subroutine are checked. First, in step 1605, a flag fLensStopErr indicating the stopped state of the lens is checked. If fLensStopErr = 1, it is determined that the lens has stopped, and the flow advances to step 1609 to determine that the lens is in an excessive error state, and fLensStsErr = 1.
To end the subroutine CheckLensSts.

In step 1605, fLensSt
If opErr = 0, it is determined that the lens is rotating, and the flow advances to step 1606. In step 1606, a flag fLensI indicating an abnormality in the rotation direction of the lens is set.
Check nvErr. If fLensInvErr = 1, it is determined that there is an abnormality in the rotation direction of the lens, and the process proceeds to step 1609.

If fLensInvErr = 0, it is determined that the rotation direction of the lens is normal, and the process proceeds to step 1607. In step 1607, a flag fLensRpmErr indicating an abnormality of the lens speed is checked. If fLensRpmErr = 1, it is determined that an abnormality has occurred in the lens speed.
Proceed to.

If fLensRpmErr = 0, it is determined that the speed is normal, and the flow advances to step 1608. In step 1608, it is determined that the lens is operating normally, and fLensStsErr = 0, and
The subroutine CheckLensSts ends.

The subroutine CalcRp will be described with reference to FIG.
m will be described.

In step 1701, the current speed of the lens is calculated by the following equation.

CurRpm = (Lpos−Lpos0) / (T1−Tpos0) (10) In step 1702, preparations are made for the next calculation.

Storage of current time Tpos0 = T1 Storage of current position Lpos0 = Lpos In step 1703, the sign of the current speed calculated in step 1701 by the following equation is checked.

CurRpm> 0 (11) If Expression (11) is satisfied, it is assumed that the lens is rotating in the CW (MOD) direction, and the flow proceeds to step 1705.
Assuming that fCurCwCcw = 1, the subroutine Calc
Exit Rpm. If Expression (11) is not satisfied, it is assumed that the lens is rotating in the CW (INF) direction, the flow proceeds to step 1704, and fCurCwCcw = 0, and the subroutine CalcRpm ends.

The subroutine CheckS will be described with reference to FIG.
The top will be described.

In step 1801, the position Ls checked last time
A comparison is made between top0 and the position Lpos sampled this time. If not, proceed to step 1802,
Prepare for the next check.

Save current position Lstop0 = Lpos Save current time Tpos0 = T1 Then proceed to step 1806, assuming that the lens has not stopped, set fLensStopErr = 0, and end the subroutine CheckStop.

In step 1801, the position L previously checked
If stop0 and the currently sampled position Lpos match, the process proceeds to step 1804, and the stop time is calculated by the following equation.

Tstop = T1−Tstop0 (12) Then, the process proceeds to step 1805, where the calculated stop time T is calculated.
The stop and the stop detection reference time TstopStd are compared by the following equation.

Tstop ≧ TstopStd (13) When Expression (13) is not satisfied, it is determined that the lens is moving, and the process proceeds to Step 1806. If Expression (13) is satisfied, the flow advances to step 1807 to determine that the lens is stopped, set the flag fLensStopErr = 1, and end the subroutine CheckStop.

Using the subroutine CheckD with reference to FIG.
ir will be described. In step 1901, the driving direction flag fDrvCwCcw and the current rotation direction flag fCur
Examine the consistency of CwCcw. If they match, the lens is rotating in the drive direction, so the process proceeds to step 1905 to prepare for the next check.

Save current time Tinv0 = T1 (14) In step 1906, it is determined that there is no abnormality in the rotation direction of the lens, the flag fLensInvErr is set to 0, and the subroutine CheckDir is ended.

At step 1901, the driving direction flag fD
rvCwCcw and current rotation direction flag fCurCwC
If cw does not match, proceed to step 1902,
The abnormal time in the rotation direction is calculated by the following equation.

Tinv = T1−Tinv0 (15) Next, in step 1903, a comparison is made between the abnormal rotational direction time Tinv and the reference time TinvStd for detecting reverse movement by the following equation.

Tinv ≧ TinvStd (16) If equation (16) is not satisfied in step 1903, the abnormal time in the rotation direction is within the reference time, so step 190
Proceed to 6.

If the formula (16) is satisfied in step 1903, the abnormal time in the rotational direction has passed the reference time or more.
Then, the flag fLensInvErr = 1 is set, and the subroutine CheckDir is ended.

The subroutine CheckR will be described with reference to FIG.
pm will be described.

In step 2001, the command speed DemR
The speed error reference speed RpmErrStd with respect to pm is calculated by the following equation.

RpmErrStd = ABS (DemRpm × RpmErrRatio) (17) In step 2002, a speed error RpmErr between the command speed DemRpm and the current speed CurRpm is calculated by the following equation.

RpmErr = ABS (DemRpm−CurRpm) (18) In step 2003, the speed error reference speed RpmErr
A comparison between Std and the speed error RpmErr is performed by the following equation.

RpmErrStd ≧ RpmErr (19) When Expression (19) is satisfied in Step 2003 (when the speed error is considered to be small), it is not considered that a speed error abnormality has occurred, and in Step 2007, Prepare for the next check.

Saving the current time Trpm0 = T1 Then, in step 2008, it is determined that no speed abnormality has occurred, the flag fLensRpmErr = 0, and the subroutine CheckRpm is terminated.

If equation (19) is not satisfied in step 2003 (if the speed error is considered to be large), in step 2004, the unsatisfied time is calculated by the following equation.

Trpm = T1−Trpm0 (20) The speed abnormal time Trpm calculated in step 2005
The speed error abnormality detection reference time TrpStd is compared with the following formula.

Trpm ≧ TrpmStd (21) If the equation (21) is not satisfied in step 2005, the process proceeds to step 2008 because the abnormal speed time is within the reference time. If Expression (21) is satisfied in step 2005, the abnormal speed time has exceeded the reference time, so that it is determined that a speed abnormality has occurred, and the process proceeds to step 2006 and the flag fLen
sRpmErr = 1, subroutine CheckRp
Exit m.

Referring to FIG. 21, subroutine OverE
rr will be described.

In step 2101, the lens is stopped.
In step 2102, a display indicating that the operation has stopped in an excessive error state is performed. In step 2103, a flag process is performed.

Lens driving flag fLensOnDrive = 0 Lens manual flag fLensManual = 1 In step 2104, the lens checks the remote mode / local mode. In the case of the remote mode (when fRemoteLocal = 1), the manual mode flag (fLe) is set in step 2105 to notify that the lens has entered the manual mode.
nsManual = 1) to the camera using serial communication.

In step 2104, in the case of the local mode (if fRemoteLocal = 0), in step 2106, the stop target position Ltarget is set as DemandMan as data for releasing the manual mode.
Save as u, and terminate the subroutine OverError.

Here, in the case of the local mode, the stop target position Ltarget is stored as DemandManu.
The same effect can be obtained by saving as andManu.

The focus lens has been described above as an example. However, the present invention can be applied to a zoom lens, an IRIS, a wobbling lens used for AF, and the like. The same can be achieved by using not only serial but also a parallel interface.

[0179]

According to the first to eighth aspects of the present invention, control without inconsistency in the lens system can be realized, erroneous operation of input target position information due to a command error or noise can be suppressed, and optical means can be controlled. Can be stopped at the target position.

[Brief description of the drawings]

FIG. 1 is a system block diagram showing an embodiment of the present invention.

FIG. 2 is a view showing an absolute position of the lens in FIG. 1 in a moving direction.

FIG. 3 is a flowchart of a main process of the system in FIG. 1;

FIG. 4 is a flowchart of interrupt processing by serial communication in FIG. 3;

FIG. 5 is a flowchart of an initialization process in FIG. 3;

FIG. 6 is a flowchart of a lens mode set in FIG. 3;

FIG. 7 is a flowchart of lens remote mode processing 1 of FIG. 3;

FIG. 8 is a flowchart of lens remote mode processing 2 in FIG. 3;

FIG. 9 is a flowchart of processing in a lens driving direction in FIG. 3;

FIG. 10 is a flowchart of a lens driving direction check process in FIG. 3;

FIG. 11 is a flowchart of a drive dead zone check process in FIG. 3;

FIG. 12 is a flowchart of a lens drive preparation process of FIG. 3;

FIG. 13 is a flowchart of a lens driving start process of FIG. 3;

FIG. 14 is a flowchart of a lens position stop process of FIG. 3;

FIG. 15 is a flowchart of target position arrival stop processing of FIG. 3;

FIG. 16 is a flowchart of a lens state checking process in FIG. 3;

FIG. 17 is a flowchart of processing of the lens speed in FIG. 3;

FIG. 18 is a flowchart of a lens stopping process of FIG. 3;

FIG. 19 is a flowchart of a rotation direction process of FIG. 3;

FIG. 20 is a flowchart of a speed error check process of FIG. 3;

FIG. 21 is a flowchart of an over error detection stop process of FIG. 3;

FIG. 22 is a flowchart of a lens local mode process of FIG. 3;

FIG. 23 is a flowchart of a stop target position limiting process of FIG. 3;

FIG. 24 is an explanatory diagram of the end processing in FIG. 3;

[Explanation of symbols]

 Reference Signs List 101 lens unit 102 aCPU 103 timer 104 motor drive driver 105 motor 106 optical lens 107 encoder 108 counter 109 manual operation unit 110 START-SW 111 display unit 112 R / L-SW 113 EEPROM 120 camera unit 121 bCPU

Claims (8)

[Claims] 1. A photographing lens apparatus having movable optical means, driving means for driving said optical means, and drive control means for controlling said driving means, wherein said drive control means is provided with an input target. A photographing lens device comprising target position limiting means for limiting a position to a position within a predetermined range. 2. A photographing lens device having a movable optical device, a driving device for driving the optical device, and a driving control device for controlling the driving device, wherein the photographing lens device is mounted on a camera device and used. A photographing lens device, wherein the drive control means includes target position limiting means for limiting a target position input from the camera device to a position within a predetermined range. 3. The photographing lens device according to claim 1, wherein the predetermined range is set within a mechanically movable range of the optical member. 4. The method according to claim 1, wherein when the target position is not located within the predetermined range, the target position is replaced with an outermost position within the predetermined range closest to the target position. The photographing lens device according to any one of claims 1 to 3. 5. A drive unit for driving an optical unit within a predetermined range in accordance with data of a value in a predetermined range, wherein the optical unit is driven by the drive unit based on data from a setting unit for setting data indicating a drive position. In a photographing lens device for driving a unit to a position corresponding to the data, when the data set in the setting unit is data having a value outside the predetermined range, the data is changed to a value within the predetermined range. A photographing lens device, further comprising a changing unit, wherein the driving unit is driven in accordance with the changed data when the data is data having a value outside a predetermined range. 6. The data in the predetermined range is a data up to a first value and a second value larger than the first value,
When the data representing the drive position from the setting means indicates a value smaller than the first value, the changing means changes the set data to the data of the first value. Item 6. A photographing lens device according to item 5. 7. When the data indicating the drive position from the setting unit indicates a value larger than the second value, the changing unit changes the set data to the data of the second value. The photographing lens device according to claim 5 or 6, wherein: 8. The photographing lens device according to claim 5, wherein the setting unit sets data representing a driving position of the lens in a range exceeding the predetermined range.