JP2000162491A - Optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handling for speed control even when a drive speed of a lens is normalized in communication with a camera. SOLUTION: This device has a drive control means to control a lens based on an output of a speed detecting means for detecting a lens speed of the lens movable within a prescribed range and a speed command, and a normalization means for normalizing at least either of resolution of the detected output in the speed detecting means or resolution of the speed command. The resolutions for the speed command or the resolutions for the detected output of the speed detecting means are prepared plurally to be selectable, they are normalized by the normalizing means, and the moving body (the lens) is controlled by the drive control means based on the resolution of the detected output of the speed detecting means and the resolution of the speed command selected respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical device such as a photographic lens used for television photographing.

[0002]

2. Description of the Related Art Conventionally, in a broadcast television camera system, communication is 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.

On the other hand, in a lens, a feedback system using a potentiometer as a position sensor is configured to perform an analog servo control system.

In addition, since analog signals are limited in the number of types and the accuracy of the types, a serial interface has recently been used as a communication function between a camera and a lens.

[0005]

However, in the above conventional example, in communication between a lens and a camera or between a lens and an accessory, data depending on the position resolution of an optical system such as a focus lens, a zoom lens, and an IRIS in a lens system. In the camera system, the processing method must be changed according to the type of the lens system, or the processing must be performed using a higher resolution than necessary. In some cases, the rate of change of the speed command or the speed information changed too much or hardly changed, so that handling was very troublesome.

[0006]

According to a first aspect of the present invention, there is provided an optical apparatus having moving means for moving within a predetermined range and driving means for controlling the speed of the moving means. The speed of the moving means is determined based on the position data representing the predetermined range as a predetermined number of steps and the speed data representing the moving amount per unit time by the number of steps, and the number of steps of the position data is changed. It was made.

According to a second configuration for realizing the object of the present invention, there is provided changing means for changing the number of steps of the position data in accordance with information relating to a time required for the moving means to move in the predetermined range. It is a thing.

According to a third configuration for realizing the object of the present invention, in the above-mentioned first configuration, the number of steps of the position data is determined in advance by a rate of change of the speed of the moving means with respect to a minimum change of the speed data. A changing means is provided for changing the value so as to fall within the specified range.

According to a fourth configuration for realizing the object of the present invention, in the above-mentioned third configuration, the changing means changes the number of steps of the position data necessary for the moving means to move in the predetermined range. It changes according to the information about time.

In a fifth configuration for realizing the object of the present invention, in any one of the above configurations, the speed is determined according to the ratio between the speed data and the position data.

According to a sixth aspect of the present invention, there is provided an optical apparatus having a moving means for moving within a predetermined range and a driving means for controlling the speed of the moving means. Position data expressed as the number of steps of
Speed control means for determining the speed of the moving means based on the speed data representing the amount of movement per unit time by the number of steps, and a communication unit for communicating the position data from a device connected to the optical device to the optical device. Have

In a seventh configuration for realizing the object of the present invention, in the above-mentioned sixth configuration, the number of steps of the position data is information relating to a time required for the moving means to move in the predetermined range. Is set to a different value according to.

According to an eighth configuration for realizing the object of the present invention, in the above-mentioned sixth configuration, the number of steps of the position data is such that the rate of change of the speed of the moving means with respect to the minimum change of the speed data is predetermined. The value is set so as to fall within a predetermined range.

According to a ninth configuration for realizing the object of the present invention, in the above-mentioned sixth, seventh or eighth configuration, the speed control means determines the speed in accordance with a ratio between speed data and position data. It was done.

A tenth structure for realizing the object of the present invention is as follows.
In the sixth, seventh, eighth, or ninth configuration, the speed data is transmitted from the device. According to an eleventh configuration for realizing the object of the present invention, in the sixth, seventh, eighth, ninth or tenth configuration, the optical device is a lens device, and the device is a camera.

A twelfth structure for realizing the object of the present invention is as follows.
A drive unit connected to a device that sends speed command information, receiving the speed command information from the device, and controlling the speed of a moving unit that moves within a predetermined range based on the information. In the position data representing the predetermined range as a predetermined number of steps, and the speed of the moving means based on the speed data expressed by the number of steps per unit time sent from the device as the speed command information The speed determining means to be determined and the number of steps of the position data are changed in accordance with information relating to the time required for the moving means instructed by the device to move in the predetermined range.

A thirteenth configuration for realizing the object of the present invention is:
A drive unit connected to a device that sends speed command information, receiving the speed command information from the device, and controlling the speed of a moving unit that moves within a predetermined range based on the information. The speed data representing the amount of movement per unit time sent from the device as the speed command information in the number of steps, and the predetermined time according to the time required for the moving means to move in the predetermined range. And speed determining means for determining the speed of the moving means on the basis of the position data representing the range as a predetermined different number of steps.

A fourteenth structure for realizing the object of the present invention is as follows.
In the twelfth or thirteenth configuration, the speed control means determines a speed according to a ratio between speed data and position data.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) 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 121 denotes a camera unit for photographing through the optical system of the lens unit 101.

Reference numeral 102 denotes a control device (hereinafter a CPU) which manages a lens unit and controls a servo system;
Reference numeral 3 denotes a driver for driving the motor 104; 106, an optical lens connected to the motor 104; 107, an encoder for detecting the position of the optical lens 106;
Is a counter for counting the output from the encoder 107.

Reference numeral 112 denotes a timer.
And the counter 108 are connected to the aCPU 102,
The CPU 102 can know the position and speed of the optical lens 106 by using the value of the counter 108 and the value of the timer 112.

Reference numeral 105 denotes a manual operation unit for manually moving the optical lens 106. Reference numeral 110 denotes a switch (hereinafter referred to as R / L-SW) for selecting whether to control the lens unit in the remote mode or the local mode. A demand 131 is connected to the lens unit 101, an A / D converter 111 for A / D converting the command of the demand 131 is connected, and a demand command value for controlling the optical lens 106 is sent to the aCPU 102. Can be entered.

A camera controller 121 (hereinafter referred to as bCPU) 122 is mounted on the camera section 121 so that serial communication 141 with the aCPU 102 of the lens section 101 can be performed.

Here, the remote mode and the local mode by the R / L-SW 110 will be described. The remote mode is a mode in which the optical lens 106 is controlled by a control command from the bCPU 122 of the camera unit 121, and the local mode is a mode in which a control command from the demand 131 is selected to control the optical lens 106.

Next, the relationship between the moving direction of the optical lens 106 and the count value of the counter 108 will be described with reference to FIG. Here, it is assumed that the optical lens 106 is a focus lens.

Infinity (INF) end 21 of focus lens
When the counter value of the counter 108 at 0 is 0, the counter 108 at the nearest (MOD) end 211
Is 20,000.

When the focus lens rotates clockwise (CW), the focus lens moves toward the MOD end 211, and the counter 108 counts up. When the focus lens rotates in the CCW direction, the focus lens moves in the INF end direction 210, and the counter 108 counts down.

The focus lens is MOD end 211
While moving in the direction, the focus lens takes a positive value, and while the focus lens moves in the direction of the INF end 210, the focus lens takes a negative value.

An encoder pulse output mechanism for detecting the position and speed of the focus lens will be described with reference to FIG.

The diameter of the C gear attached to the drive motor 104 is φMotor [mm], the diameter of the B gear 203 meshing with the C gear 202 is φFocus [mm], and the focus lens 207 is moved by the B gear 203 to the INF end (infinity). End) 21
It can move from 0 to the MOD end (closest end) 211.

Further, the B gear 203 is
And the pulse output of the encoder 107 is input to the counter 108. Here, the diameter of the A gear is φEnc [mm], and the encoder 1
The output pulse per rotation of 07 is PPEnc [P / R].
Also, the focus lens 207 is operated by the manual operation unit 105.
Can move from the INF end 210 to the MOD end 211.

A servo / manual mode switch SW (not shown) is provided.
4, the focus lens 207 is driven. In the manual mode, the focus lens 20 is
7 can be operated.

At this time, a clutch (not shown) is connected to the motor 104. In the manual mode, the movement of the focus lens 207 causes the encoder 107 to move.
Rotates, but the driving force of the motor 104 is not transmitted to the focus lens 207 by the clutch.

In the above configuration, the motor 104
Count value PP of the counter 108 per rotation at
Rot is represented by the following equation.

PPRot = φMotor ÷ φEnc × PPEnc (Equation 1) Further, the focus lens 207 is moved from the INF end 210 by M
Assuming that the number of rotations of the motor 104 required to move to the OD end 211 is NRot, the focus lens 207
The number of output pulses PPTotal of the encoder 107 generated when moving from the NF end 210 to the MOD end 211 is represented by the following equation.

PPTotal = PPRot × NRot (Equation 2) Here, the focus lens 2 is obtained by using (Equation 1) and (Equation 2).
The number of counts of the counter 108 by the output pulse of the encoder 107 when 07 moves from the INF end 210 to the MOD end 211 will be calculated under the following conditions.

[Conditions] Number of output pulses per rotation of encoder 107 PPEn
c = 2500 [P / R] Diameter φAnc of the A gear attached to the encoder 107 =
10 [mm] Diameter of C gear attached to motor 104 φMotor =
20 [mm] Number of rotations of the motor 104 required for the focus lens 207 to move from the INF end 210 to the MOD end 211
Nrot = 100 [Rotation] At this time, if the count value of the counter 108 at the INF end 210 is set to “0”, the count value PPTotal of the counter 108 at the MOD end 211 is PPTotal = 20 ÷ 10 × 2500 × 100 = 500000 [ Pulse].

Similarly, PPEnc, φEnc, φMotor, NRot
FIG. 6 shows an example of calculating the count value PPTotal when the value is changed.

Also, as shown in FIG. 8, the output of the encoder 107 is a two-phase pulse output system which is usually called a A-phase and a B-phase and is shifted by 90 degrees, for example, as shown in FIG. As described above, when the encoder 107 rotates in the CW direction, the A phase advances by 90 degrees from the B phase, and when the encoder 107 rotates in the CCW direction as shown in (2) of FIG.
It is configured to be delayed by degrees.

To cope with this, the counter 108
Phase and B phase edges are detected and counted. As a result, the value multiplied by 4 is counted.
At this time, the counter 108 counts up when the phase A is ahead of the phase B, and counts down when the phase A is behind the phase B. FIG. 7 shows an example of counting the result of the quadrupling.

As described above, the IN of the focus lens 207
The count number PPTotal of the counter 108 in the moving range from the F end 210 to the MOD end 211 is the rotation speed N Rot of the motor 104 depending on the moving range of the focus lens.
, The diameter φM of the C gear 202 attached to the motor 104
otor, the diameter φEnc of the A gear attached to the encoder 107, and the number of output pulses PPEnc in one rotation of the encoder 107, etc., and the value also has a considerable width.

A pattern of the count value of the counter 108 at the MOD end 211 when the INF end 210 in the case of the focus lens 207 is set to the reference value “0” (count value of the counter 108) will be described with reference to FIG.

For example, the counter 1 at the MOD terminal 211
When the count value of 08 is 10,000, 50000, and 35000000,
The number of bytes required for each is as follows.

(1) In case of 10000 [pulse] 2 bytes (2) In case of 500000 [pulse] 3 bytes (3) In case of 35000000 [pulse] 4 bytes This means that the camera unit 121 in the remote mode.
When the bCPU 122 designates the position of the focus lens 207 using the serial communication 141, the lens unit 1
This means that the data differs depending on the type of 01. For example, when the bCPU 122 of the camera unit instructs to move the focus lens 207 to the position of 5000 through the serial communication 141, the aCPU 102 of the lens unit 101 sets 500 in the case of (1).
0/10000 = 0.5 (= 50 [%])
10 and the center of the MOD end 211.

In the case of (2), 5000/500000 = 0.01
(= 1 [%]), and is moved to a position near the INF end 210.

In the case of (3), 5000/35000000 ≒ 0.
(= 0.014 [%]), and is hardly moved from the INF end 210.

Therefore, the bCPU of the camera unit 121
Reference numeral 122 denotes a resolution of an effective moving range of the focus lens 207 of the lens unit 101 (from the INF end 210 to the MOD end 21).
It is necessary to know the total number of movement pulses up to 1). This is performed by exchanging information through the serial communication 141 when the camera unit 121 and the lens unit 101 complete initialization. For example, the case (2) will be described. BCPU 122 of camera unit 121 to aCPU of lens unit 101
When the position resolution information of the focus lens 207 is requested to the 102 via the serial communication 141, the INF terminal 2
The position of 10 is “0” and the position of the MOD end 211 is “50000”.
“0” may be transferred from the aCPU 102 of the lens unit 101 to the bCPU 122 of the camera unit 121 using the serial communication 141.

However, as can be seen from the above examples (1) to (3), the number of bytes of the position information of the focus lens 207 differs. This means that the camera unit 1
21 means that the data length required for the arithmetic processing of the bCPU 122 differs depending on the type of the lens unit 101.

For example, assume that the bCPU 122 of the camera unit 121 is a 16-bit microcomputer. At this time, in the case of (1), the arithmetic processing can be performed with a 2-byte (16-bit, int) length, but in the case of (2), the arithmetic processing with a 4-byte (32-bit, long) length is required. In addition, in the case of (3), it is necessary to perform the arithmetic processing in a floating point (float). Arithmetic processing often requires high speed, so we would like to use fixed-point arithmetic as much as possible.
Furthermore, it is desirable that the operation can be performed with int (the data length is 16 bits for a 16-bit microcomputer, and the data length is 32 bits for a 32-bit microcomputer).

Therefore, as shown in FIG.
What is necessary is to normalize the resolution between the OD ends 211 and always give a position command by serial communication 141 between the lens unit 101 and the camera unit 121 using fixed data.

Thus, the camera unit 121 does not need to consider the resolution of the focus lens 207 depending on the type of the lens unit 101.

Here, the required positional resolution of the focus lens 207 will be described. The resolution calculated from the MTF and the sensitivity is about 1/5000 for NTSC, and 1/20000 for HD.

Then, as a normalized position, for example,
30000, INF end 210 is “0”, MOD end 211
Is defined as "30000", sufficient resolution can be obtained for the focus lens 207.

Using this normalized data, when "15000" is given as the position command of the focus lens 207, the aCPU 102 of the lens unit 101 sets the focus lens 207 to (1) (10000 × 15000/30000) If ÷ 10000 = 0.5 (2) (500000 x 15000 ÷ 30000) ÷ 500000 = 0.5 If (3), it will be moved to the position of (35000000 x 15000 ÷ 30000) ÷ 35000000 = 0.5.

That is, the type of the lens unit 101 (from the INF end 210 to the MOD end 211 of the focus lens 207)
Irrespective of the number of pulses up to), the aCPU 102 moves the focus lens 207 to the position of the midpoint between the INF end 210 and the MOD end 211.

Here, the normalized position information is stored in the lens unit 101.
After the initialization of the camera unit 121 and the camera unit 121 is completed, information may be exchanged using the serial communication 141 or the lens unit 1 may be exchanged.
01 and the camera unit 121 can be determined in advance by the information communication format.

Here, the command position PPFocu of the focus lens 207 in the lens unit 101 is calculated from the normalized position command.
To calculate s Cmd, the following equation may be used.

Normalized position information between the INF end and the MOD end: NorInfMod Number of effective pulses between the INF end and the MOD end: PPInfMod Normalized position command: When NorFocus Cmd is set, PPFocus Cmd = PPInfMod × NorFocus Cmd ÷ NorInfMod ( Expression 3) Conversely, when the normalized position information NorFocusInf is obtained from the current position PPFocusInf of the focus lens 207, the following expression is used.

NorFocusInf = NorInfMod × PPFocusInf ÷ PPInfMod (Equation 4) If this normalized position information NorFocusInf is transferred from the lens unit 101 to the camera unit 121 using the serial communication 141, the camera can be used regardless of the type of the lens unit 101. Part 121
Can know the position of the focus lens 207.

The speed command will be described with reference to FIG. Generally, in a video camera, a system is constructed using a signal synchronized with video data in order to perform video processing. At this time, it is common practice to use a vertical synchronization signal (V synchronization signal), which is one frame of video.

The V synchronization signal is 1/60 in NTSC.
[Second], 1/50 [second] in PAL, 1/60 in HD
[Seconds]. Therefore, it is desirable that the speed command and the speed information are also speed data in V synchronization units.
Therefore, a case in which speed data in V synchronization units is used will be described below.

Now, assume that the entire-range normalized position for speed is "30000". The absolute value of the speed command in the minimum unit is “1 step / V
Synchronization unit ", and the next speed becomes" 2 steps / V synchronization unit ". At this time, since the minimum speed change is “± 1 step / V synchronization unit”, if the current speed command is “N step / V synchronization unit”, the minimum change rate of the speed is (1 / N). × 100 [%]. FIG. 9 shows this as a table.

As can be seen from this table, the speed change rate is considerably large when the speed command in the V synchronization unit is about 1 to 10. When the speed command is about 25, the rate of change falls within 5%.

Further, it can be seen that there is almost no change (the rate of change is small) at about 1600. In general, TV
The value required for the speed of the lens for the camera is converted from 0.3 [sec] to 300 [sec] (5 [min]) in terms of the entire area moving time.
The dynamic range is 1000 times the value.
This whole area moving time can be calculated by the following equation.

(Whole area moving time [seconds]) = speed whole area normalized position ÷ normalized speed command × V synchronization unit [second] (Equation 5) At this time, on the high speed moving side, the speed resolution is sufficient, but The travel time is about 5 seconds and the resolution of the speed command is
0.06 [%]), and on the low speed side, the practical range is about 20 seconds (about 4 [%] as the speed resolution) in the whole area movement time. In other words, if the total travel time is 250 [seconds], 50
[%], The rate of change is too large to be practical. If the rate of change in speed does not fall below 5%,
Command speed change is too rough and cannot be used.

Therefore, the entire-range normalized position for speed is set to “5000”.
The case of “00” is shown in FIG. At this time, the speed command in the vicinity of the entire region moving time 300 [seconds] is about 25 [step / V synchronization unit], and the speed change rate falls within 5 [%] or less.

Further, high-speed movement (0.3 times in the whole area movement time)
[Second]) side is less than or equal to 27400 [step / V synchronization unit].
From the high speed to the low speed, it can fit within the range of 16 bits.

On the other hand, the whole-range normalized position for speed is set to “50”.
In the case of "0000", the speed change rate on the high speed side is very small, so that it is difficult to handle a command for high speed movement. Therefore, FIG. 11 shows a list of speed commands when the entire-area normalized position for high-speed movement is set to “1000”. As can be seen from this table, the speed change rate on the high-speed side (the whole area movement time is 0.5 [sec] or less) is about 2 to 3 [%], so that the high-speed movement command is easy to handle.

Similarly, it is also possible to obtain the whole-range normalized position for the speed so that the medium speed can be easily handled.

This will be described with reference to FIG.
The difference when the same normalized speed command is given to the low speed command will be described.

The entire area moving time is calculated assuming that the high-speed speed command takes "1000" as the whole-area normalized position, the medium-speed command takes "30000", and the low-speed command takes "500,000". As a speed change rate that facilitates speed operation when giving a speed command, about 2% is considered,
Here, the speed change rate is 2 as the normalized speed command.
Consider a case in which 50 [step / V synchronization unit] (V synchronization unit = 1/60 [second]) which is [%] is given.

0.33 [sec] for high speed, 10.0 for medium speed
0 [seconds] and 166.67 [seconds] for low-speed use. That is,
It is possible to drive the lens by selecting speed commands for high speed, medium speed, and low speed in consideration of the speed change rate that is easy to operate. That is, by giving a speed command while taking the speed resolution into consideration, smooth lens control becomes possible.

For example, when driving at a high speed, "1000" is set as the whole-area normalized position, and 50 is given as the normalized speed command. This data is communicated from the camera to the lens, and the speed is controlled under the above conditions. In this case, assuming that the entire movement distance of the original lens is X (fixed), the entire area normalized position is "1000".
Since the movement time per step is 1/60 second,
The speed per step is X ÷ 1000 × 60 × 50.

That is, according to the above-mentioned normalized speed / speed command and the whole-region normalized position, X ÷ the whole-region normalized position × the normalized speed command × V synchronization unit. Therefore, the lens side determines the motor speed by performing the above-described calculation according to the generalized normalized position and normalized speed command from the camera, and performs speed control.

As the normalized speed command, it is desirable to use a value within a command range in which the rate of change in speed is 2 to 3%.

The command structure will be described with reference to FIG. The command system from the camera section 121 to the lens section 101 has a configuration of 8 bits for the header section + 16 bits for the data section.

At this time, it is assumed that a movement command of the lens 106 is assigned to the header portion and command information is assigned to the data portion. For example, a movement command A1H is a normalized position command, a low-speed normalized speed command is B1H, a medium-speed normalized speed command is B2H, and a high-speed normalized speed command is B3H.
Assign commands as follows.

In the data portion, in the case of a normalized position command command, position information for stopping the lens 106 is placed.

In the case of the normalized speed command, V
A value that takes the direction into account for the number of movement steps in the synchronization unit is placed. Here, the direction is a positive (+) value when moving in the direction of the MOD end 211 in the case of the focus lens 207, and a negative (-) value when moving in the direction of the INF end 210. You should take it.

Assuming that the maximum speed data is about 0.3 [seconds] when the speed command entire area normalized position is set to 30000, the normalized speed command is changed from “−2000 [step / V synchronization unit]” to “+2000 [ Step / V synchronization unit] ”.

The speed command entire area normalized position may be determined in advance for the speed command command (header part), or may be determined by initial communication between the lens unit 101 and the camera unit 121.

That is, when the speed command command is transmitted from the camera to the lens for the entire region normalized position, for example, if the speed is low, "5000"
For example, predetermined data such as "00" or "30000" for medium speed may be stored in the lens, and the data may be selected according to the communicated command, or may be combined with the command command. May communicate from the camera to the lens. In any case, the whole-region normalized position may be selected according to the speed, and the processing according to the above expression may be performed.

The camera unit 1 has been described with reference to FIGS.
Although the speed command is given as a command to be given to the lens unit 101 by the lens unit 21, the speed information of the lens 106 of the lens unit 101 may be similarly defined and given to the camera unit 121.

Although the "V synchronization unit" has been used as the unit of the time axis of the speed command and the speed information, it goes without saying that another unit may be used.

Although the focus lens has been described as an example of the lens 106 of the lens unit 101, it is needless to say that the present invention can be applied to other optical systems such as a zoom lens and an IRIS.

The present invention can be applied to accessories other than the camera section. Further, although an encoder is used as a means for detecting the lens position, it may be a combination of a potentiometer and an A / D converter. Here, the values "30000", "50000", and "1000" are used as the position command normalized position and the speed command normalized position, but these values themselves have no meaning and may be other values. Further, although serial communication is used for communication between the lens unit and the camera unit, it is also possible to perform communication using parallel communication.

The communication using the position command normalized position and the speed command normalized position is performed by the lens unit 10.
This is not the case only between the camera unit 121 and the camera unit 121. For example, the aCPU 102 of the lens unit 101 inputs a command from the demand 131, which is an accessory, through the A / D converter 111, but the CPU is mounted on the demand 131 and has a communication function similar to that of the camera unit. Even in this case, it is possible to adapt to perform communication by normalizing the position and speed of the lens.

That is, it is needless to say that normalizing and communicating the position and speed information of the lens 106 can be applied between the lens unit 101 and another system (including accessories) such as the camera unit 121. No.

[0089]

As described above, according to the present invention,
In a combination of a photographic lens and a camera or an accessory, or in an optical device such as a photographic lens itself, control of a moving body such as an optical system using a fixed arithmetic process regardless of the type of lens system in the optical device such as a photographic lens. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration according to a first embodiment of the present invention;

FIG. 2 is a diagram showing an encoder pulse output mechanism of FIG. 1;

FIG. 3 is a diagram illustrating the number of encoder output pulses.

FIG. 4 is a view for explaining the number of normalization steps according to the first embodiment;

FIG. 5 is a diagram showing a lens moving direction according to the first embodiment;

FIG. 6 is a diagram showing a pulse count number table 1 according to the first embodiment;

FIG. 7 is a diagram showing a pulse count number table 2 according to the first embodiment;

FIG. 8 shows a waveform diagram of an encoder pulse.
W direction, (2) CCW direction

FIG. 9 is a diagram showing a normalized speed command table according to the first embodiment;

FIG. 10 is a diagram showing a normalized speed command table according to the first embodiment;

FIG. 11 is a diagram showing a normalized speed command table according to the first embodiment;

FIG. 12 is a chart of the entire area moving time with respect to the normalized speed command according to the first embodiment.

FIG. 13 is a view for explaining a normalized position and speed command according to the first embodiment;

[Explanation of symbols]

 101 lens unit 1 aCPU 2 driver 3 motor 4 manual operation unit 5 lens 6 encoder 7 counter 110 R / L-SW 111 A / D converter 121 camera unit 122 CPU-b 131 demand 141 serial communication

[Procedure amendment]

[Submission date] December 15, 1999 (1999.12.
15)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

According to a first aspect of the present invention, there is provided an optical apparatus having moving means for moving within a predetermined range and driving means for controlling the speed of the moving means. position data representing the predetermined range as a predetermined number of steps, and determines the speed of the moving means based on the speed data representing a moving amount per unit time in step number, to change the number of steps of the position data It was made.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 13

Claims (14)

[Claims] 1. An optical apparatus comprising: moving means for moving within a predetermined range; and driving means for controlling the speed of the moving means, wherein: position data representing the predetermined range as a predetermined number of steps; Determine the speed of the moving means based on the speed data representing the amount of movement per unit by the number of steps,
An optical device, wherein the number of steps of the position data is changed. 2. The apparatus according to claim 1, further comprising changing means for changing the number of steps of the position data in accordance with information on a time required for the moving means to move in the predetermined range. Optical device. 3. A changing means for changing the number of steps of the position data so that the rate of change of the speed of the moving means falls within a predetermined range with respect to the minimum change of the speed data. The optical device according to claim 1. 4. The apparatus according to claim 3, wherein the changing unit changes the number of steps of the position data in accordance with information on a time required for the moving unit to move in the predetermined range. Optical device. 5. The optical device according to claim 1, wherein the speed is determined according to a ratio between the speed data and the position data. 6. An optical apparatus comprising: a moving unit that moves within a predetermined range; and a driving unit that controls the speed of the moving unit, wherein: position data representing the predetermined range as a predetermined number of steps; Speed control means for determining the speed of the moving means based on the speed data representing the amount of movement per unit by the number of steps, and a communication unit for communicating the position data from a device connected to the optical device to the optical device. An optical device characterized by the above-mentioned. 7. The method according to claim 6, wherein the number of steps of the position data is set to a different value according to information on a time required for the moving means to move in the predetermined range. Optical device. 8. The method according to claim 1, wherein the number of steps of the position data is set to a value such that a rate of change of the speed of the moving means falls within a predetermined range with respect to a minimum change of the speed data. The optical device according to claim 6. 9. The optical device according to claim 6, wherein the speed control means determines a speed according to a ratio between the speed data and the position data. 10. The optical device according to claim 6, wherein the speed data is transmitted from the device. 11. The optical device according to claim 6, wherein the optical device is a lens device, and the device is a camera.
The optical device according to 8, 9, or 10. 12. A drive unit connected to a device for transmitting speed command information, receiving the speed command information from the device, and controlling the speed of a moving unit that moves within a predetermined range based on the information. In the optical device having, based on position data representing the predetermined range as a predetermined number of steps, and speed data representing the amount of movement per unit time sent from the device as the speed command information, the number of steps. Speed determining means for determining the speed of the moving means, and changing the number of steps of the position data in accordance with information on the time required for the moving means instructed by the device to move in the predetermined range. Characteristic optical device. 13. Driving means connected to a device for transmitting speed command information, receiving the speed command information from the device, and controlling the speed of a moving unit that moves within a predetermined range based on the information. In the optical device having, speed data representing the amount of movement per unit time sent from the device as the speed command information by the number of steps,
Speed control means for determining a speed of the moving means based on position data representing the predetermined range as a predetermined different number of steps according to a time required for the moving means to move in the predetermined range. Characteristic optical device. 14. The optical device according to claim 12, wherein the speed control means determines the speed according to a ratio between the speed data and the position data.