JP2016065896A - Imaging apparatus, imaging control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct the deviation of a lens position in a lens unit having a compact and inexpensive mechanism.SOLUTION: An imaging apparatus 1 includes a positional deviation amount storage part 72, a position correction part 54, and a motor control part 55. The positional deviation amount storage part 72 stores the previously measured positional deviation amount of a zoom lens as the number of pulses of an encoder. The position correction part 54 calculates a lens correction position in a set zoom step on the basis of the positional deviation amount stored in the positional deviation amount storage part 72. The motor control part 55 stops the zoom lens in the lens position corrected by the position correction part 54.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an imaging apparatus, an imaging control method, and a program.

2. Description of the Related Art Conventionally, in a zoom mechanism of a camera, a DC motor is used for position control of a zoom lens because of the advantage that the apparatus can be downsized.
For example, Patent Document 1 discloses a digital camera that uses a DC motor as a driving source for a variable power lens.
Here, it is not easy to stop the DC motor at the target position, and an error may occur due to a lens position shift due to a rotation angle shift that occurs when the zoom lens is stopped or an unintended position detection pulse is generated. It can happen.
In order to correct such errors, for example, two position detection encoders shifted by half a cycle are prepared, and the direction of rotation is known from the position detection pulse, thereby subtracting and correcting the pulse in the unintended rotation direction. The technology to do is known. In addition, for example, a technique is known in which a point that can reset the position of the DC motor is prepared in the driving range of the zoom lens, and the position is reset each time the point passes, thereby correcting the deviation.

JP 2001-208948 A

However, if it is attempted to correct an error caused by the position control of the DC motor by these methods, the unit price of the lens unit increases or the size of the lens unit increases.
That is, in the prior art, it has been difficult to appropriately correct the zoom position deviation with a lens unit having a small and inexpensive mechanism.

  The present invention has been made in view of such a situation, and an object thereof is to more appropriately correct a zoom position shift with a lens unit having a small and inexpensive mechanism.

In order to achieve the above object, an imaging device of one embodiment of the present invention includes:
A positional deviation amount storing means for storing the positional deviation amount of the zoom lens measured in advance as the number of pulses of the encoder;
Correction position calculation means for calculating the correction position of the lens in the set zoom stage based on the position shift amount stored in the position shift amount storage means;
Position control means for stopping the zoom lens at the lens position corrected by the correction position calculation means;
It is characterized by providing.

  According to the present invention, it is possible to correct a zoom position shift with a lens unit having a small and inexpensive mechanism.

It is a block diagram which shows the structure of the hardware of the imaging device which concerns on one Embodiment of this invention. It is a functional block diagram which shows the functional structure for performing correction amount acquisition processing and zoom control processing among the functional structures of the imaging device of FIG. It is a schematic diagram which shows the content of the positional offset amount table memorize | stored in the positional offset amount memory | storage part. 3 is a flowchart for explaining a flow of correction amount acquisition processing executed by the imaging apparatus of FIG. 1 having the functional configuration of FIG. 2. 3 is a flowchart for explaining a flow of zoom control processing executed by the imaging apparatus of FIG. 1 having the functional configuration of FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Hardware configuration]
FIG. 1 is a block diagram showing a hardware configuration of an imaging apparatus 1 according to an embodiment of the present invention.
The imaging device 1 is configured as a digital camera, for example.

  The imaging apparatus 1 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, a bus 14, an input / output interface 15, an imaging unit 16, and a sensor unit 17. An input unit 18, an output unit 19, a storage unit 20, a communication unit 21, and a drive 22.

  The CPU 11 executes various processes according to a program recorded in the ROM 12 or a program loaded from the storage unit 20 to the RAM 13. For example, the CPU 11 executes zoom control processing according to a program for zoom control processing described later.

  The RAM 13 appropriately stores data necessary for the CPU 11 to execute various processes.

  The CPU 11, ROM 12, and RAM 13 are connected to each other via a bus 14. An input / output interface 15 is also connected to the bus 14. An imaging unit 16, a sensor unit 17, an input unit 18, an output unit 19, a storage unit 20, a communication unit 21, and a drive 22 are connected to the input / output interface 15.

  The imaging unit 16 includes an optical lens unit 16a and an image sensor 16b.

The optical lens unit 16a is configured by a lens that collects light, for example, a focus lens, a zoom lens, a diaphragm unit, a shutter unit, and the like in order to photograph a subject.
The focus lens is a lens that forms a subject image on the light receiving surface of the image sensor 16b. The zoom lens is a lens that freely changes the focal length within a certain range by being moved in the optical axis direction by a DC motor.
The optical lens unit 16a is also provided with a control circuit such as a peripheral circuit for adjusting the focus setting parameter and a DC motor for adjusting the position of the zoom lens. Further, the optical lens unit is provided with a peripheral circuit for adjusting setting parameters such as exposure and white balance as necessary.

The image sensor 16b includes a photoelectric conversion element, an AFE (Analog Front End), and the like.
The photoelectric conversion element is composed of, for example, a CMOS (Complementary Metal Oxide Semiconductor) type photoelectric conversion element or the like. A subject image is incident on the photoelectric conversion element from the optical lens unit. Therefore, the photoelectric conversion element photoelectrically converts (captures) the subject image, accumulates the image signal for a predetermined time, and sequentially supplies the accumulated image signal as an analog signal to the AFE.
The AFE performs various signal processing such as A / D (Analog / Digital) conversion processing on the analog image signal. Through various signal processing, a digital signal is generated and output as an output signal of the imaging unit 16.

  The sensor unit 17 includes various sensors such as a temperature sensor, a three-axis acceleration sensor, and a vertical / horizontal sensor (a sensor capable of detecting the vertical and horizontal orientations of the angle of view).

The input unit 18 includes various buttons, a microphone, and the like, and inputs various information and audio information according to a user's instruction operation.
The output unit 19 includes a display, a speaker, and the like, and outputs images and sounds.
The storage unit 20 is configured by a hard disk, a DRAM (Dynamic Random Access Memory), or the like, and stores various image data.
The communication unit 21 controls communication with other devices (not shown) via a network including the Internet.

  A removable medium 31 made of a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is appropriately attached to the drive 22. The program read from the removable medium 31 by the drive 22 is installed in the storage unit 20 as necessary. The removable medium 31 can also store various data such as image data stored in the storage unit 20 in the same manner as the storage unit 20.

[Functional configuration]
FIG. 2 is a functional block diagram illustrating a functional configuration for executing the correction amount acquisition process and the zoom control process among the functional configurations of the imaging apparatus 1 as described above.
The correction amount acquisition process is a series of processes for acquiring positional deviation data at each zoom stage of the zoom lens. The zoom control process is a series of processes for controlling the position of the zoom lens so as to obtain a predetermined zoom level by correcting the positional deviation amount acquired in the correction amount acquisition process in accordance with a user operation. .

  When the correction amount acquisition process and the zoom control process are executed, as shown in FIG. 2, in the CPU 11, the position measurement unit 51, the posture information acquisition unit 52, the temperature information acquisition unit 53, the position correction unit 54, The motor control unit 55 functions. Further, a lens position storage unit 71 and a positional deviation amount storage unit 72 are set in one area of the storage unit 20.

  The lens position storage unit 71 stores a zoom level (zoom level) from a wide angle to a telephoto and a design value of the position of the zoom lens corresponding to each zoom level.

  The positional deviation amount storage unit 72 is associated with data of deviation amounts (positional deviation amounts) between the design value of the zoom lens position and the actual measurement value for each zoom stage stored in the lens position storage unit 71. (Hereinafter referred to as a “positional deviation amount table”) is stored. The misregistration amount storage unit 72 stores a misregistration amount table generated for each temperature and posture of the imaging apparatus 1.

FIG. 3 is a schematic diagram showing the contents of the misregistration amount table stored in the misregistration amount storage unit 72.
As shown in FIG. 3, in the positional deviation amount table, positional deviation amount data is associated with each zoom stage of 0 to 255.
Further, the positional deviation amount table is set for each predetermined temperature (for example, 5 ° C.) up to temperatures T1 to Tn (n is a positive integer). Further, such a positional deviation amount table group is set for each predetermined posture of the imaging apparatus 1 with respect to postures X1 to Xm (m is a positive integer).
That is, the misregistration amount storage unit 72 stores a plurality of misregistration amount tables for each predetermined temperature for a specific posture of the imaging device 1 (for example, a posture in which the lens faces upward). For other postures (for example, a posture in which the lens faces downward), a plurality of positional deviation amount tables for each predetermined temperature are stored.

Returning to FIG. 2, the position measurement unit 51 measures the amount of positional deviation of the lens position of the zoom lens and stores it in the positional deviation amount storage unit 72.
Specifically, the position measuring unit 51 changes the zoom lens from the initial position to the design value of the lens position corresponding to the zoom stage stored in the lens position storage unit 71, and when the zoom lens returns to the initial position again. The actual measurement value of the lens position (that is, the amount of positional deviation from the design value) is measured. Then, the position measurement unit 51 stores the measured lens position deviation amount in the position deviation amount table in association with the zoom stage. Further, the position measurement unit 51 measures such a lens position shift amount for each predetermined posture acquired by the posture information acquisition unit 52 described later, and stores the measured lens position shift amount in a position shift amount table. Store. Further, the position measuring unit 51 measures the amount of deviation of the lens position for each predetermined temperature acquired by a temperature information acquisition unit 53 described later, and stores the measured amount of deviation of the lens position in the position deviation amount table.

  The posture information acquisition unit 52 acquires data indicating the posture of the imaging device 1 (for example, whether the lens is upward or downward) based on values acquired from the acceleration sensor or the vertical / horizontal sensor of the sensor unit 17. .

  The temperature information acquisition unit 53 acquires data indicating the temperature of the imaging device 1 from the temperature sensor of the sensor unit 17.

When the zoom operation is performed by the user, the position correction unit 54 reads out and reads out the position shift amount corresponding to the zoom level designated by the user operation from the position shift amount table in the position shift amount storage unit 72. The control position of the zoom lens is corrected based on the amount of displacement.
Specifically, when the zoom operation by the user is performed, the position correction unit 54 specifies the zoom stage corresponding to the timing when the zoom operation is stopped, and the lens position of the zoom lens corresponding to the specified zoom stage. Are read from the lens position storage unit 71. Further, the position correction unit 54 reads out a position shift amount table corresponding to the current temperature and posture from the position shift amount storage unit 72 and acquires a position shift amount corresponding to the specified zoom stage. Further, the position correction unit 54 corrects the control position of the lens position from the design value based on the read positional deviation amount, and calculates the control position for stopping the zoom lens.
Accordingly, the stop position of the zoom lens can be controlled by correcting the amount of positional deviation corresponding to the zoom stage of the zoom operation according to the temperature and posture when the zoom operation is performed.

  The motor control unit 55 controls the driving of the DC motor so as to be the lens position of the zoom lens designated by the user's operation, and moves the zoom lens.

[Operation]
FIG. 4 is a flowchart for explaining the flow of correction amount acquisition processing executed by the imaging apparatus 1 of FIG. 1 having the functional configuration of FIG.
The correction amount acquisition process is started when an operation for instructing execution of the correction amount acquisition process is input. The correction amount acquisition process is executed at the time of factory shipment, for example.

In step S <b> 11, the position measurement unit 51 sets an initial temperature value for measuring the amount of positional deviation. Note that the environment in which the imaging apparatus 1 is placed is adjusted so as to be at the set temperature corresponding to the set temperature.
In step S <b> 12, the position measurement unit 51 sets the posture of the imaging device 1 to the initial value of the posture for measuring the amount of positional deviation.
In step S <b> 13, the position measurement unit 51 sets an initial value of the zoom stage for measuring the positional deviation amount (here, the zoom stage is “0”).

In step S14, the motor control unit 55 starts a zoom operation (drive of the DC motor) so that the lens position of the zoom lens becomes the initial value of the zoom stage from the initial position.
In step S15, the motor control unit 55 instructs to stop the zoom operation (drive of the DC motor) at the position of the zoom lens corresponding to the set zoom stage. At this time, the position measuring unit 51 measures the movement amount of the zoom lens as the number of pulses of the encoder.
In step S <b> 16, the motor control unit 55 performs control to drive the DC motor until the lens position of the zoom lens returns to the initial position. At this time, the position measuring unit 51 measures the movement amount of the zoom lens as the number of pulses of the encoder.

In step S17, the position measuring unit 51 measures the amount of deviation of the lens position of the zoom lens based on the pulse measured in step S15 and the pulse measured in step S16, and stores the measured amount of deviation of the lens position. . In other words, when the position measurement unit 51 moves the zoom lens to the design value of the lens position corresponding to the zoom stage stored in the lens position storage unit 71, the actual measurement value of the lens position is different from the design value. The deviation amount is stored in the positional deviation amount storage unit 72.
Based on the amount of lens position deviation, the zoom lens position deviation can be specified for each zoom stage and temperature / posture, and the position deviation that occurs when the zoom lens is moved by executing zoom control processing. Can be corrected.

In step S18, the position measurement unit 51 determines whether or not the set zoom stage is the final zoom stage (here, zoom stage “255”).
If the set zoom level is the final zoom level, YES is determined in step S18, and the process proceeds to step S20.
On the other hand, if the set zoom level is not the final zoom level, NO is determined in step S18, and the process proceeds to step S19.

  In step S19, the position measurement unit 51 sets the set zoom level to the next zoom level and shifts the process to step S14 in order to measure the lens position deviation amount again.

In step S20, the position measurement unit 51 determines whether or not the set posture is the final posture.
If it is the final posture, YES is determined in step S20, and the process proceeds to step S22.
On the other hand, if it is not the final posture, NO is determined in step S20, and the process proceeds to step S21.

  In step S21, the position measuring unit 51 sets the set posture to the next posture, sets the zoom stage to an initial value, and measures the lens position deviation amount again, so that the process is performed in step S14. Migrate to

In step S22, the position measuring unit 51 determines whether or not the set temperature is the final temperature.
When it is the final temperature, it is determined as YES in Step S22, and the correction amount acquisition process is ended.
On the other hand, if it is not the final temperature, NO is determined in step S22, and the process proceeds to step S23.

  In step S23, the position measurement unit 51 sets the set temperature to the next temperature, sets the zoom stage and posture to the initial values, and measures the lens position deviation amount again. The process proceeds to step S14.

FIG. 5 is a flowchart illustrating the flow of zoom control processing executed by the imaging apparatus 1 of FIG. 1 having the functional configuration of FIG.
The zoom control process is started when a zoom operation by the user is input.

In step S31, the motor control unit 55 starts control for driving the DC motor (that is, zoom operation) so that the zoom lens is moved from the initial position to the lens position designated by the user's operation.
In step S <b> 32, the position correction unit 54 identifies a stop zoom level corresponding to the user's zoom operation, and reads the design value of the lens position corresponding to the stop zoom level read from the lens position storage unit 71.

In step S <b> 33, the temperature information acquisition unit 53 acquires data indicating the temperature of the imaging device 1 from the temperature sensor of the sensor unit 17.
In step S <b> 34, the posture information acquisition unit 52 acquires data indicating the posture of the imaging device 1 based on values acquired from the gyro sensor and the acceleration sensor of the sensor unit 17.

  In step S35, the position correction unit 54 refers to the position shift amount table in the position shift amount storage unit 72, and corresponds to the stop zoom stage specified in step S32, the temperature acquired in step S33, and the posture acquired in step S34. Get the amount of displacement.

  In step S36, the position correction unit 54 corrects the design value of the lens position read in step S32 based on the positional deviation amount read in step S35, and calculates a control position (stop position) for stopping the zoom lens. To do.

  In step S37, the motor control unit 55 performs control to stop the zoom operation (drive of the DC motor) at the stop position calculated in step S36.

  Through such processing, in the imaging apparatus 1 of the present embodiment, the amount of positional deviation corresponding to the correction conditions such as the zoom stage, the attitude of the imaging apparatus 1 and the temperature is acquired and stored in advance. As a result, it is possible to correct an error caused by a rotational angle shift or an unintended position detection pulse that occurs when the zoom lens is stopped, or an error caused by temperature or posture. That is, the imaging apparatus 1 according to the present embodiment can more appropriately correct the lens position shift in the lens unit having a small and inexpensive mechanism.

The imaging apparatus 1 configured as described above includes a misregistration amount storage unit 72, a position correction unit 54, and a motor control unit 55.
The positional deviation amount storage unit 72 stores the amount of positional deviation of the zoom lens measured in advance as the number of encoder pulses.
The position correction unit 54 calculates the correction position of the lens in the set zoom stage based on the position shift amount stored in the position shift amount storage unit 72.
The motor control unit 55 stops the zoom lens at the lens position corrected by the position correction unit 54.
Thereby, the amount of positional deviation of the zoom lens can be acquired and stored in advance, and an error that occurs when the zoom lens is stopped can be corrected.
Therefore, the zoom position shift can be corrected more appropriately with a small and inexpensive lens unit.

Further, the amount of positional deviation of the zoom lens is the amount of positional deviation with respect to the design value of the position of the zoom lens at each zoom stage.
As a result, in a lens unit having a small and inexpensive mechanism, it is possible to store the amount of displacement of the zoom lens that differs for each zoom stage, and to correct an error that occurs between the design value of the lens position.

Further, the zoom lens position shift amount is a position shift amount with respect to the design value of the zoom lens position due to the difference in the posture of the imaging apparatus 1.
Thereby, in a lens unit having a small and inexpensive mechanism, it is possible to store the amount of displacement of the zoom lens, which differs depending on the attitude of the imaging device 1, and to correct an error occurring between the design value of the lens position.

Further, the amount of positional displacement of the zoom lens is the amount of positional displacement with respect to the design value of the position of the zoom lens due to the temperature difference of the imaging device 1.
As a result, in a lens unit having a small and inexpensive mechanism, it is possible to store the amount of displacement of the zoom lens that varies depending on the temperature of the imaging device 1, and to correct an error that occurs between the design value of the lens position.

Further, the position correction unit 54 calculates the correction position of the lens in the set zoom stage based on the value calculated by the interpolation process from the position shift amount stored in the position shift amount storage unit 72.
This makes it possible to calculate the lens correction position at each zoom stage more accurately.

Further, the positional deviation amount of the zoom lens is a positional deviation due to the rotational deviation of the DC motor.
As a result, it is possible to appropriately correct the positional deviation of the zoom lens due to the rotational deviation of the DC motor.

The zoom lens position shift amount stored by the position shift amount storage unit 72 is obtained by storing the zoom lens position shift amount measured in advance as the number of pulses of one encoder.
Accordingly, it is possible to appropriately correct the positional deviation of the zoom lens with a simpler configuration.

  In addition, this invention is not limited to the above-mentioned embodiment, The deformation | transformation in the range which can achieve the objective of this invention, improvement, etc. are included in this invention.

  In the above-described embodiment, the position correction unit 54 stops the zoom lens being driven at the stop position where the amount of lens displacement is corrected, but the position where the amount of lens displacement is corrected finally. As long as the zoom lens can be stopped, the method for stopping the zoom lens is not limited to this. For example, after performing control to temporarily stop the zoom lens at a position corresponding to the design value, the position may be corrected according to the amount of positional deviation of the zoom lens.

  In the above-described embodiment, an example in which the zoom stage and the temperature and orientation of the imaging apparatus 1 are all correction conditions has been described. However, the condition for correcting the positional deviation amount is not limited thereto. For example, the zoom lens position shift is corrected based on one or two conditions of the zoom stage and the temperature or orientation of the imaging apparatus 1, or correction conditions other than the temperature and orientation of the zoom stage and imaging apparatus 1 are used. Based on this, the displacement of the zoom lens may be corrected.

  Further, in the above-described embodiment, the temperature and orientation of the imaging device 1 set in the positional deviation amount table are discrete values, and thus are closest to the data acquired by the sensor unit 17. A corresponding positional deviation amount table can be used. It is also possible to calculate the amount of positional deviation by performing interpolation such as linear interpolation on the data acquired by the sensor unit 17 with reference to the positional deviation amount table corresponding to the value sandwiching the data. is there.

In the above-described embodiment, the imaging apparatus 1 to which the present invention is applied is described as a digital camera, but is not particularly limited thereto.
For example, the present invention can be applied to general electronic devices having a function of driving a zoom lens. Specifically, for example, the present invention is applicable to a video camera, a mobile phone, a smartphone, a portable game machine, and the like.

The series of processes described above can be executed by hardware or can be executed by software.
In other words, the hardware configuration and functional configuration shown in FIGS. 1 and 2 are merely examples, and are not particularly limited. That is, it is sufficient that the imaging apparatus 1 has a function capable of executing the above-described series of processing as a whole, and what functional block is used to realize this function is not particularly limited to the example of FIG. .
In addition, one functional block may be constituted by hardware alone, software alone, or a combination thereof.

  In addition, the hardware configuration and the functional configuration provided in the imaging apparatus 1 in the above-described embodiment may be provided in other devices, and are not limited to the examples of FIG. 1 and FIG.

When a series of processing is executed by software, a program constituting the software is installed on a computer or the like from a network or a recording medium.
The computer may be a computer incorporated in dedicated hardware. The computer may be a computer capable of executing various functions by installing various programs, for example, a general-purpose personal computer.

  A recording medium including such a program is provided not only to the removable medium 31 distributed separately from the apparatus main body in order to provide the program to the user, but also to the user in a state of being incorporated in the apparatus main body in advance. Recording medium. The removable medium is composed of, for example, a magnetic disk (including a floppy disk), an optical disk, a magneto-optical disk, or the like. The optical disc is composed of, for example, a CD-ROM (Compact Disk-Read Only Memory), a DVD (Digital Versatile Disc), a Blu-ray (registered trademark) Disc (Blu-ray Disc), and the like. The magneto-optical disk is configured by an MD (Mini-Disk) or the like. In addition, the recording medium provided to the user in a state of being preliminarily incorporated in the apparatus main body includes, for example, the ROM 12 in FIG. 1 in which a program is recorded, the hard disk included in the storage unit 20 in FIG.

In the present specification, the step of describing the program recorded on the recording medium is not limited to the processing performed in chronological order according to the order, but is not necessarily performed in chronological order, either in parallel or individually. The process to be executed is also included.
Further, in the present specification, the term “system” means an overall apparatus configured by a plurality of devices, a plurality of means, and the like.

  As mentioned above, although several embodiment of this invention was described, these embodiment is only an illustration and does not limit the technical scope of this invention. The present invention can take other various embodiments, and various modifications such as omission and replacement can be made without departing from the gist of the present invention. These embodiments and modifications thereof are included in the scope and gist of the invention described in this specification and the like, and are included in the invention described in the claims and the equivalent scope thereof.

The invention described in the scope of claims at the beginning of the filing of the present application will be appended.
[Appendix 1]
A positional deviation amount storing means for storing the positional deviation amount of the zoom lens measured in advance as the number of pulses of the encoder;
Correction position calculation means for calculating the correction position of the lens in the set zoom stage based on the position shift amount stored in the position shift amount storage means;
Position control means for stopping the zoom lens at the lens position corrected by the correction position calculation means;
An imaging apparatus comprising:
[Appendix 2]
The image pickup apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a positional deviation amount with respect to a design value of the position of the zoom lens at each zoom stage.
[Appendix 3]
The image pickup apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a position deviation amount with respect to a design value of the position of the zoom lens due to a difference in posture of the image pickup apparatus.
[Appendix 4]
4. The image pickup apparatus according to claim 1, wherein the zoom lens position shift amount is a position shift amount with respect to a design value of a zoom lens position due to a temperature difference of the image pickup apparatus. 5. .
[Appendix 5]
The correction position calculation unit calculates a correction position of the lens in a set zoom stage based on a value calculated by interpolation processing from the position shift amount stored in the position shift amount storage unit. Item 5. The imaging device according to any one of Items 1 to 4.
[Appendix 6]
The imaging apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a positional deviation due to a rotational deviation of a DC motor.
[Appendix 7]
2. The positional deviation amount of the zoom lens stored by the positional deviation amount storage means is obtained by storing the positional deviation amount of the zoom lens measured in advance as the number of pulses of one encoder. The imaging device according to any one of 1 to 6.
[Appendix 8]
The imaging apparatus according to claim 1, further comprising a measurement unit that measures a positional deviation amount of the zoom lens.
[Appendix 9]
A zoom control method executed by an imaging apparatus,
A correction position calculation step for calculating a correction position of the lens in the set zoom stage based on the position shift amount read from the position shift amount storage means for storing the zoom lens position shift amount measured in advance as the number of pulses of the encoder. When,
A position control step of stopping the zoom lens at the lens position corrected in the correction position calculating step;
An imaging control method comprising:
[Appendix 10]
In the computer that controls the imaging device,
A correction position calculation function for calculating the correction position of the lens at the set zoom stage based on the position shift amount read from the position shift amount storage means for storing the zoom lens position shift amount measured in advance as the number of pulses of the encoder When,
A position control function for stopping the zoom lens at the lens position corrected by the correction position calculation function;
A program characterized by realizing.

  DESCRIPTION OF SYMBOLS 1 ... Imaging device, 11 ... CPU, 12 ... ROM, 13 ... RAM, 14 ... Bus, 15 ... Input / output interface, 16 ... Imaging part, 16a ... Optical lens unit, 16b ... image sensor, 17 ... sensor unit, 18 ... input unit, 19 ... output unit, 20 ... recording unit, 21 ... communication unit, 22 ... Drive, 31 ... removable media, 51 ... position measurement unit, 52 ... attitude information acquisition unit, 53 ... temperature information acquisition unit, 54 ... position correction unit, 55 ... motor control , 71... Zoom position storage unit, 72.

Claims (10)

A positional deviation amount storing means for storing the positional deviation amount of the zoom lens measured in advance as the number of pulses of the encoder;
Correction position calculation means for calculating the correction position of the lens in the set zoom stage based on the position shift amount stored in the position shift amount storage means;
Position control means for stopping the zoom lens at the lens position corrected by the correction position calculation means;
An imaging apparatus comprising:   The image pickup apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a positional deviation amount with respect to a design value of the position of the zoom lens at each zoom stage.   The image pickup apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a position deviation amount with respect to a design value of the position of the zoom lens due to a difference in posture of the image pickup apparatus.   4. The image pickup apparatus according to claim 1, wherein the zoom lens position shift amount is a position shift amount with respect to a design value of a zoom lens position due to a temperature difference of the image pickup apparatus. 5. .   The correction position calculation unit calculates a correction position of the lens in a set zoom stage based on a value calculated by interpolation processing from the position shift amount stored in the position shift amount storage unit. Item 5. The imaging device according to any one of Items 1 to 4.   The imaging apparatus according to claim 1, wherein the amount of positional deviation of the zoom lens is a positional deviation due to a rotational deviation of a DC motor.   2. The positional deviation amount of the zoom lens stored by the positional deviation amount storage means is obtained by storing the positional deviation amount of the zoom lens measured in advance as the number of pulses of one encoder. The imaging device according to any one of 1 to 6.   The imaging apparatus according to claim 1, further comprising a measurement unit that measures a positional deviation amount of the zoom lens. A zoom control method executed by an imaging apparatus,
A correction position calculation step for calculating a correction position of the lens in the set zoom stage based on the position shift amount read from the position shift amount storage means for storing the zoom lens position shift amount measured in advance as the number of pulses of the encoder. When,
A position control step of stopping the zoom lens at the lens position corrected in the correction position calculating step;
An imaging control method comprising: In the computer that controls the imaging device,
A correction position calculation function for calculating the correction position of the lens at the set zoom stage based on the position shift amount read from the position shift amount storage means for storing the zoom lens position shift amount measured in advance as the number of pulses of the encoder When,
A position control function for stopping the zoom lens at the lens position corrected by the correction position calculation function;
A program characterized by realizing.

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