JP6424876B2 - Interchangeable lens and camera body - Google Patents

Description

  The present invention relates to an interchangeable lens and a camera body.

Conventionally, in a so-called single-lens reflex camera system, an interchangeable lens capable of calculating the drive time of an aperture is known. For example, Patent Document 1 describes a configuration in which the lens microcomputer in the interchangeable lens calculates the driving time of the diaphragm from the speed information of the diaphragm stored in advance in the internal memory and the driving amount information received from the camera microcomputer. It is done.
However, the prior art has not described the possibility that the information stored in advance in the storage medium in the interchangeable lens may be damaged due to a strong electrical shock or the like.

Unexamined-Japanese-Patent No. 2006-208897

The interchangeable lens according to the first aspect of the present invention is an interchangeable lens that communicates with a camera body, and includes a driven unit, a driving unit that drives the driven unit, and a desired driving speed for driving the driven unit. A receiver configured to receive from the camera body first information including the first drive amount and a desired drive amount; and second information regarding drive time when driving the driven portion by the drive amount at the drive speed; A storage unit for storing third information to be used when obtaining using the one information, and a transmission unit for transmitting the second information obtained based on the first information and the third information to the camera body The control unit controls the drive unit and the transmission unit, and the control unit does not drive the driven unit based on the first information to the drive unit, and the control unit controls the camera body. The second information to the transmitter To trust.
A camera body according to a second aspect of the present invention includes a driven unit, a driving unit for driving the driven unit, and the driving unit driving the driven unit by a desired driving amount at a desired driving speed. A storage unit for storing, as lens data relating to the drive of the driven unit, an arithmetic expression for calculating the drive time required for the drive unit; an attachment unit for mounting an interchangeable lens, and a predetermined drive speed and a predetermined drive amount The transmitter calculated to transmit the first information to the interchangeable lens, and the information calculated by applying the information included in the first information to the arithmetic expression in the interchangeable lens after the transmission of the first information by the transmitter Receiving by the receiving unit that receives from the interchangeable lens as lens side determination data that can determine whether the lens data is correctly stored in the storage unit as the driving time, and the receiving unit Based on the lens-side determination data, and a determining unit configured to determine whether or not the lens data in the storage unit is stored correctly.

It is a perspective view showing composition of a camera system concerning a 1st embodiment. FIG. 3 is a schematic cross-sectional view of a camera body 100 and a first interchangeable lens 200a. FIG. 5 is a schematic cross-sectional view of a camera body 100 and a second interchangeable lens 200b. FIG. 5 is a schematic cross-sectional view of a camera body 100 and a third interchangeable lens 200c. It is a flowchart of the initialization process which the body control apparatus 109 performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a performs. It is a flowchart of the imaging | photography process which the body control apparatus 109 performs in a 1st control mode. It is a flowchart of the imaging | photography process which 1st lens control apparatus 209a performs in a 1st control mode. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 2nd Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 2nd Embodiment performs. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 3rd Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 3rd Embodiment performs. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on 4th Embodiment performs. It is a flowchart of the initialization process which the 1st lens control apparatus 209a which concerns on 3rd Embodiment performs. It is a figure which shows the memory content of body side ROM which concerns on a modification. It is a flowchart of the initialization process which the body control apparatus 109 which concerns on a modification performs.

First Embodiment
Hereinafter, a camera system according to a first embodiment to which the present invention is applied will be described using the drawings. FIG. 1 is a perspective view showing the configuration of a camera system according to the first embodiment. The digital camera system shown in FIG. 1 is composed of a camera body 100 and a first interchangeable lens 200 a attachable to the camera body 100. In addition to the first interchangeable lens 200a, the second interchangeable lens 200b and the third interchangeable lens 200c can be attached to the camera body 100. The differences between these three types of interchangeable lenses 200a, 200b and 200c will be described in detail later.

  The camera body 100 includes a so-called bayonet-type body-side mount unit 101. When the lens side mount portion 201 of the first interchangeable lens 200 a is fitted into and fixed to the body side mount portion 101, the plurality of electrical contacts 202 provided on the lens side mount portion 201 are provided on the body side mount portion 101. It is electrically connected to the electrical contact 102. In addition, the camera body 100 is provided with a release switch 120 which can be pressed halfway and fully.

(Description of Digital Camera System of Camera Body 100 and First Interchangeable Lens 200a)
FIG. 2 is a schematic cross-sectional view of the camera body 100 and the first interchangeable lens 200a. The first interchangeable lens 200 a includes an imaging optical system that receives a light flux from a subject and forms an object image on an imaging surface. This imaging optical system is composed of a plurality of lenses 203, 204, 205 and a stop 206. The lens 204 is a focusing lens that can move in the direction of the optical axis X. The camera body 100 has an imaging element 104 that captures a subject image formed by the imaging optical system, converts the subject image into an electrical signal, and outputs the electrical signal. The imaging device 104 is, for example, a solid-state imaging device such as a CCD or a CMOS. Although omitted in FIG. 2, an infrared cut filter for cutting infrared light, an optical low pass filter for preventing aliasing noise of an image, and the like are disposed on the imaging surface of the imaging element 104. There is.

  A quick return mirror 103 is disposed on the optical path of the light flux transmitted through the imaging optical system in the camera body 100 so as to block the imaging element 104. The quick return mirror 103 is at a position shown by a solid line in FIG. 2 before exposure (when not photographing), and reflects subject light from the imaging optical system toward the finder screen 107 disposed above the camera body 100. . The finder screen 107 is disposed at a position conjugate with the image sensor 104 with respect to the quick return mirror 103.

  Object light reflected by the reflection surface of the quick return mirror 103 is transmitted through the finder screen 107, introduced into a pentagonal prism (pentagonal daha prism), and emitted toward the eyepiece lens 110. Therefore, in the state before exposure, the photographer can visually recognize the subject image through the eyepiece lens 110.

  The vicinity of the center of the quick return mirror 103 (near the optical axis X of the optical system) is a half mirror, and part of the subject light passes through the half mirror portion. The transmitted light beam is reflected by the sub mirror 105 provided on the back surface of the quick return mirror 103, and is incident on the focus detection device 106 provided on the lower part of the camera body 100. The focus detection device 106 detects the focusing state of the imaging optical system.

  At the time of exposure, the quick return mirror 103 and the sub mirror 105 move to the lower portion (retracted position) of the finder screen 107. When the quick return mirror 103 and the sub mirror 105 move to the retracted position, subject light transmitted through the imaging optical system is introduced to the imaging element 104. Thereafter, the imaging element 104 captures an object image formed on the imaging surface.

  The first interchangeable lens 200 a includes a first lens control device 209 a that controls each part of the first interchangeable lens 200 a. Also, the camera body 100 includes a body control device 109 that controls each part of the camera body 100. The first lens control device 209a and the body control device 109 are bi-directional by exchanging electrical signals via a plurality of electrical contacts 102 and 202 provided on the mounts on the camera body side and the interchangeable lens side respectively. Data communication can be performed.

  The first interchangeable lens 200 a includes a lens driving unit 207 that drives the focusing lens 204 in the direction along the optical axis X, and a diaphragm driving unit that drives the diaphragm 206 to change the size of the opening through which subject light passes. And 208. The lens driving unit 207 and the diaphragm driving unit 208 each include an actuator (for example, a stepping motor or the like) (not shown), and the focusing lens 204 or the focusing lens according to the driving speed, driving amount and driving direction given from the first lens control device 209a. The diaphragm 206 is driven.

  The camera body 100 includes an in-body aperture drive unit 111 having an actuator (not shown). When an interchangeable lens (described later) not provided with a drive mechanism for the diaphragm 206 is attached, the in-body diaphragm drive unit 111 transmits the driving force of the actuator to the diaphragm 206 in the interchangeable lens to drive the diaphragm 206. . Since the first interchangeable lens 200a shown in FIG. 2 includes the diaphragm drive unit 208, the in-body diaphragm drive unit 111 does nothing when the first interchangeable lens 200a is mounted.

  The first interchangeable lens 200 a includes a ROM 210 which is a non-volatile storage medium. Lens data (to be described in detail later) related to driving of the diaphragm 206 is stored in the lens side ROM 210. Similarly, the camera body 100 includes a body-side ROM 112 which is a non-volatile storage medium. In the body side ROM 112, body side determination data (body side data) (to be described later in detail) for determining that lens data is correctly stored in a lens side ROM 210 described later is stored in advance.

  The first lens control device 209a determines whether or not lens data is correctly stored in the lens ROM 210 based on lens data (details will be described later) stored in the lens ROM 210 (body (body The lens side determination data that can be determined by the control device 109) is transmitted to the body control device 109. The body control device 109 correctly stores the lens data in the lens side ROM 210 by comparing the body side determination data (body side data) stored in the body side ROM 112 with the above-mentioned received lens side determination data. It is determined whether the This determination will be described in detail later.

(Description of aperture drive)
Before the control of the diaphragm drive is started by the interchangeable lens 200, the body control device 109 first determines what kind of interchangeable lens the interchangeable lens mounted on the body side mount unit 101 is (type of interchangeable lens) This is recognized by the initial communication with the interchangeable lens 200 via the above-mentioned electrical contacts 102, 202. Whether the body control device 109 is the first interchangeable lens 200 a or the second interchangeable lens 200 b based on the contents of the lens data (or the presence or absence of lens data acquisition, etc.) acquired from the interchangeable lens 200 by initial communication. Or the third interchangeable lens 200c is identified.

  In the first embodiment, the case where the first interchangeable lens 200a is attached to the body side mount unit 101 (and the body side control device 109 has been identified) will be described below.

  When it is necessary to change the aperture diameter of the aperture 206, for example, at the time of exposure, the body control device 109 performs aperture driving command to the first lens control device 209a by data communication via the plurality of electrical contacts 102, 202. Send. When receiving the diaphragm drive command from the body control device 109, the first lens control device 209a controls the diaphragm drive unit 208 according to the parameters of the diaphragm drive command, and causes the diaphragm drive unit 208 to drive the diaphragm 206.

  The diaphragm drive command includes parameters representing the amount of drive of the diaphragm 206, the drive direction, and the drive speed. For example, it is assumed that the current aperture diameter of the aperture stop 206 has a size equivalent to F2, and this is to be changed to a size equivalent to F4. In this case, the body control device 109 transmits an aperture drive command for setting the drive amount to “two steps”, the drive direction to “narrow down direction”, and the drive speed to “maximum speed” to the first lens control device 209 a. Here, when the lens control device 209a of the interchangeable lens 200a receives, from the body control device 109, a diaphragm drive command for setting the drive speed to "the highest speed", the interchangeable lens 200a itself (diaphragm drive unit 208 itself) is driven. Drive control of the stop 206 to a target stop position (drive amount) at the maximum stop driving speed at which

  When the drive amount of the aperture 206 is defined as "the number of steps down from the open F value", a parameter representing the "drive direction" independently of the "drive amount" There is no need to include it in

  The body control device 109 normally designates "the highest speed" as the drive speed of the diaphragm 206. On the other hand, (1) to reduce the power consumption of the first interchangeable lens 200a, (2) to reduce the operation sound of the first interchangeable lens 200a, (3) to drive the diaphragm 206 during moving image shooting In a situation corresponding to any of the above, the body control device 109 transmits an aperture drive command specifying a value other than "maximum speed" as the drive speed to the first lens control device 209a.

  “(1) When it is desired to reduce the power consumption of the first interchangeable lens 200 a” is, for example, when the remaining amount of the battery is low, or when the user instructs a power saving operation. “(2) When wanting to make the operation sound of the first interchangeable lens 200 a smaller” is, for example, the case where voice recording is performed in parallel with shooting, or the case where the user instructs a silent operation. “(3) In the case of driving the aperture 206 during shooting of a moving image” is, for example, a case where the user instructs to shoot such a moving image.

  The body control device 109 transmits the diaphragm drive time prediction command to the first lens control device 209a before transmitting the diaphragm drive command as described above.

  Here, the “diaphragm drive time prediction command” output from the camera body 100 side to the interchangeable lens 200 side will be described. The diaphragm drive time prediction command drives the diaphragm 206 in the diaphragm drive unit 208 on the interchangeable lens 200 side with the diaphragm drive amount (number of steps) specified from the camera body 100 side at the diaphragm drive speed also specified from the camera body 100 side. In the case where it is made, the interchangeable lens 200 side (the first lens control device 209a) predicts (for example, prediction calculation) how much driving time is required, and the prediction (for example, prediction calculation) result is It is a command for making it output (send).

  When the camera body side (body control device 109) receives this prediction result (diaphragm predicted driving time), the predicted driving time is used for timing control related to the photographing operation, for example, timing control related to the exposure processing. As timing control for exposure processing, for example, timing control of opening and closing of the shutter in still image shooting, exposure change is not caused even if the aperture value (aperture aperture size) is changed during moving image shooting (exposure amount is constant And the timing control of the imaging sensitivity when changing the imaging sensitivity according to the movement of the aperture.

  When the first lens control device 209a receives the diaphragm drive time prediction command from the body control device 109, based on the contents of the diaphragm drive time prediction command (including at least the diaphragm drive amount a and the diaphragm drive speed v), The time required to drive the diaphragm 206 is predicted (calculated). Then, the first lens control device 209a transmits (returns) the predicted (calculated) driving time to the body control device 109.

The first lens control device 209 a predicts the driving time based on the lens data stored in the lens ROM 210. Here, the lens side ROM 210 lens data will be described. The lens side ROM 210 includes, as lens data, an arithmetic expression for calculating a predicted drive time T from the above-described diaphragm drive amount a and the diaphragm drive speed v. An example of the equation is shown in the following equation (1).
T = a / v + α (1)

  Here, α is a correction term of the diaphragm drive time, and for example, a delay time from the start of the drive control of the diaphragm 206 to the actual start of the drive of the diaphragm 206, or after driving the diaphragm 206 by a target drive amount It is determined in consideration of the time until the stationary state 206 is stabilized. The correction term α stores a different value for each interchangeable lens. Further, depending on the type of interchangeable lens, different values may be stored according to the lens setting conditions (for example, according to the focal length in the case of a zoom lens). The lens data of the lens ROM 210 also includes the value of the correction term α, and the value is determined at the time of design of the first interchangeable lens 200a. For example, if the diaphragm driving amount a is “two stages”, the diaphragm driving speed v is “10 stages / second”, and the correction term α is “0.1 second”, the first lens control is performed according to the equation (1). The device 209a predicts the predicted driving time T to be 0.3 seconds. A plurality of the correction terms α described above may be stored (provided) in accordance with the driving speed and the driving amount (the number of steps).

  The body control device 109 performs, for example, control of release timing in still image shooting based on the predicted driving time T predicted as described above.

(Description of digital camera system of camera body 100 and second interchangeable lens 200b)
FIG. 3 is a schematic cross-sectional view of the camera body 100 and the second interchangeable lens 200b. Hereinafter, differences of the second interchangeable lens 200b from the first interchangeable lens 200a will be described.

  The second interchangeable lens 200b includes a second lens control device 209b instead of the first lens control device 209a.

  First, the body control device 109 performs initial communication with the second lens control device 209b via the electric contacts 102 and 202 described above, and based on the communication result, the body side mount unit 101 performs the second exchange. It is identified that the lens 200b is attached.

  Unlike the first lens control device 209 a, the second lens control device 209 b does not correspond to the designation of the drive speed of the diaphragm 206. For this reason, the body control device 109 performs a second diaphragm drive command different in content from the above-described (diaphragm drive command sent to the first lens controller 209a), that is, the diaphragm drive command whose content does not include the diaphragm drive speed. To the lens controller 209 b of

  When receiving the diaphragm drive command transmitted from the body control device 109, the second lens controller 209b controls the diaphragm drive unit 208 in accordance with the content of the diaphragm drive command, as in the first lens controller 209a. The diaphragm drive unit 208 drives the diaphragm 206. However, since the diaphragm drive command does not include the specification of the diaphragm drive speed, when the second interchangeable lens 200b is attached to the camera body 100, the diaphragm 206 always has a predetermined speed (for example, the maximum speed that the second interchangeable lens 200b can deliver) Will be driven by

  Furthermore, the second lens control device 209 b does not correspond to the prediction (calculation) of the drive time of the diaphragm 206 as performed by the first interchangeable lens 200 a described above. Further, the second interchangeable lens 200b does not include the lens side ROM 210 in which the lens data described above is stored.

  The form of the diaphragm drive command is not limited to the above-described form (a form in which different commands are used for the first interchangeable lens 200 a and the second interchangeable lens 200 b), and for example, the first interchangeable lens 200 a and the first interchangeable lens 200 a It is also possible to share the diaphragm drive command output from the body control device 109 with the two interchangeable lenses 200b. If such a common diaphragm drive command is used, the second lens control device 209b refers to the parameters of the drive amount and drive direction of the diaphragm 206 included in the diaphragm drive command. It is configured not to refer to the parameter representing the driving speed of 206. By configuring the second lens control device 209b in this manner, the diaphragm 206 is always driven at a predetermined speed (for example, the maximum speed) when the second interchangeable lens 200b is attached to the camera body 100 as described above. It will be

(Description of digital camera system of camera body 100 and third interchangeable lens 200c)
FIG. 4 is a schematic cross-sectional view of the camera body 100 and the third interchangeable lens 200c. Hereinafter, points of the third interchangeable lens 200 c that are different from the first interchangeable lens 200 a will be described.

  The third interchangeable lens 200c includes a third lens control device 209c instead of the first lens control device 209a.

  First, the body control device 109 performs initial communication with the third lens control device 209c via the electric contacts 102 and 202 described above, and based on the communication result, the body side mount unit 101 performs the third exchange. It is identified that the lens 200c is attached.

  The third interchangeable lens 200c does not include the diaphragm drive unit 208, and therefore the third lens control device 209c does not correspond to the diaphragm drive command. That is, the third interchangeable lens 200c can not drive the diaphragm 206 by itself. Instead, an aperture interlock lever (not shown) interlocking with the aperture 206 is provided in the vicinity of the lens side mount portion 201 of the third interchangeable lens 200 c. The aperture interlocking lever is a lever that can move along a predetermined direction. The position of the diaphragm interlock lever is interlocked with the size of the aperture diameter of the diaphragm 206, and when the diaphragm interlock lever is moved, the aperture diameter of the diaphragm 206 changes accordingly. That is, in order to set the aperture diameter of the aperture 206 to a certain size, the aperture interlock lever may be moved to a position corresponding to the aperture diameter.

  When the third interchangeable lens 200 c is attached to the camera body 100, the aperture interlock lever engages with a drive member (not shown) provided in the in-body aperture drive unit 111. The in-body aperture drive unit 111 includes an actuator (not shown) that drives the drive member. When the in-body aperture drive unit 111 drives the drive member, the aperture interlock lever engaged with the drive member is moved, and the aperture diameter of the aperture 206 is changed. That is, the in-body aperture drive unit 111 drives the aperture 206 provided in the third interchangeable lens 200 c. When the third interchangeable lens 200c is attached, the body control device 109 causes the in-body aperture drive unit 111 to drive the above-described drive member instead of transmitting the aperture drive command to the third lens control device 209c. Thus, the aperture diameter of the diaphragm 206 is changed to a desired size.

  Furthermore, the third lens control device 209 c does not correspond to the prediction (calculation) of the drive time of the diaphragm 206. Further, the third interchangeable lens 200c does not include the lens side ROM 210 in which the lens data described above is stored.

(Description of the initialization process in the digital camera system of the camera body 100 and the interchangeable lens 200)
Next, an initialization process performed by the body control device 109 and the control device 209 for each lens (in particular, the first lens control device 209a) will be described. For example, when the interchangeable lens is attached to the camera body 100 in the power on state or when the camera body 100 is in the power on state after the interchangeable lens is attached to the camera body 100 in the power off state The initialization process is performed at a predetermined timing. The body control device 109 sets one of the first to fourth control modes in the camera body 100 in the initialization processing described below. The contents of each control mode will be described later. In the following description, the first lens control device 209a, the second lens control device 209b, and the third lens control device 209c are collectively referred to as a "lens control device".

  FIG. 5 is a flowchart of the initialization process performed by the body control device 109. First, after communication between the body control device 109 and the lens control device 209 is established, in the first step S100, a “lens function data request command” is transmitted to the lens control device. In step S110, the body control device 109 receives "lens function data" transmitted from the lens control device in response to the command. The lens function data is data for determining the function possessed by the interchangeable lens, and for example, the presence or absence of the diaphragm drive unit 208, whether or not the drive speed of the diaphragm 206 can be specified, the maximum drive speed at which the diaphragm 206 can operate Information related to the maximum speed of the aperture), the presence or absence of the zoom mechanism, and the like are included.

  In step S120, it is determined from the content of the lens function data received in step S110 whether the interchangeable lens attached to the body side mount unit 101 is the third interchangeable lens 200c. For example, if it is recognized from the lens function data that the diaphragm driver 208 does not exist, it is determined that the third interchangeable lens 200c is attached. If it is determined that the third interchangeable lens 200c is attached, the process proceeds to step S121, and the control mode of the camera body 100 is set to the third control mode. When the third control mode is set, the body control device 109 performs drive control of the diaphragm 206 by the in-body diaphragm drive unit 111 and does not transmit the diaphragm drive command to the lens controller.

  On the other hand, if it is determined in step S120 that an interchangeable lens other than the third interchangeable lens 200c is attached, the process proceeds to step S130. In step S130, it is determined from the content of the lens function data received in step S110 whether or not the interchangeable lens attached to the body side mount unit 101 is the second interchangeable lens 200b. For example, if it is recognized from the lens function data that the drive speed of the diaphragm 206 can not be specified, it is determined that the second interchangeable lens 200b is attached. If it is determined that the second interchangeable lens 200b is attached, the process proceeds to step S131, and the control mode of the camera body 100 is set to the second control mode. When the second control mode is set, the body control device 109 performs drive control of the diaphragm 206 by transmitting the diaphragm drive command to the lens controller, but the transmitted diaphragm drive command drives the diaphragm 206. Does not include speed.

  On the other hand, if it is determined in step S130 that an interchangeable lens other than the second interchangeable lens 200b is attached, the process proceeds to step S140. In the present embodiment, the process proceeds to step S140 when an interchangeable lens that is neither the third interchangeable lens 200c nor the second interchangeable lens 200b is attached, that is, the first interchangeable lens 200a is attached. It is.

  In step S140, the body control device 109 transmits a "determination data request command" to the first lens control device 209a. In step S150, the body control device 109 receives the "lens-side determination data" transmitted from the first lens control device 209a in response to the command. The lens side determination data used for determination on the camera body side in the present embodiment is lens data itself stored in the lens side ROM 210. As described above, the lens data is used in the equation (1) “T = a / v + α” for calculating the estimated drive time T from the aperture drive amount (number of drive stages) a and the aperture drive speed v, and the equation Correction term α of the aperture driving time to be Therefore, the lens control device 209a transmits the arithmetic expression (1) “T = a / v + α” generated based on the lens data and the correction term α to the camera body as lens side determination data. The lens side ROM 210 stores the correction term α as numerical data and stores the arithmetic expression (1) as character string data, and the lens control device 209a transmits these numerical data and character string data to the camera body. Do.

  In step S160, the body control device 109 compares the body-side determination data stored in the body-side ROM 112 with the lens-side determination data received in step S150, and determines whether or not the contents of the two data match. Do. The contents of the body side determination data in the present embodiment are the lens side determination data itself stored in advance in the body side ROM 112 (that is, the above-described arithmetic expression (1) and the correction term α). That is, in the present embodiment, the determination data (the arithmetic expression (1) “T = a / v + α” and the correction term α) of the same content are stored in advance in the body side ROM 112 and the lens side ROM 210 respectively. The body control device 109 determines whether the contents of the two lens data match.

  If the contents of the body side determination data and the lens side determination data match in step S160, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode. When the first control mode is set, the body control device 109 performs drive control of the diaphragm 206 by transmitting a diaphragm drive command including the driving speed of the diaphragm 206 to the lens controller. In addition, when the first control mode is set, the body control device 109 transmits a diaphragm driving time prediction command to the lens control device 209 before driving the diaphragm 206 to obtain a prediction driving time, and this prediction driving is performed. The drive control of the diaphragm 206 is performed using time.

  On the other hand, if the contents of the body side determination data and the lens side determination data do not match in step S160, the process proceeds to step S162. In this case, the body control device 109 considers that lens data stored in the ROM 210 in the first interchangeable lens 200a has been damaged by a strong electric impact such as static electricity, for example, and drives the diaphragm 206. Is set in the camera body 100. In the fourth control mode, the body control device 109 does not transmit the diaphragm drive command to the first lens control device 209a, and performs photographing operation and the like with the aperture diameter of the diaphragm 206 fixed. Also, display a message (so-called warning display) on the display (not shown) (liquid crystal display etc.) indicating that the stored contents of the ROM 210 are inconsistent (i.e. there is a defect on the lens side). , Notify the user that the control of the aperture 206 is restricted.

  In the present embodiment, as the contents of the above-described “fourth control mode”, the message display as described above is performed, and control of the aperture 206 is limited. However, the setting content of the fourth control mode is not limited to this. For example, the contents of the fourth control mode may be simply limited to the above-mentioned warning display. Alternatively, even stronger restriction may be made, for example, restriction of power supply from the camera body side to the accessory side (for example, prohibition of power supply to be supplied to the diaphragm drive system) may be performed. Alternatively, the camera operation may be further restricted, for example, on the camera body side.

  Further, the warning display method is not limited to the message display as described above, and any display form may be used as long as it can notify the user that a lens side has an abnormality. For example, a warning display of blinking or lighting using an LED or the like may be used. Alternatively, a simple message display (for example, "diaphragm NG" or the like) indicating that the aperture control is limited to a liquid crystal display or the like, or an icon display indicating the aperture NG may be used.

  FIG. 6 is a flowchart of lens initialization processing performed by the first lens control device 209a. First, in step S200, a "lens function data request command" is received from the body control device 109 (corresponding to step S100 in FIG. 5). In step S210, "lens function data" is transmitted to the body control device 109 (corresponding to step S110 in FIG. 5). In step S220, the "determination data request command" is received from the body control device 109 (corresponding to step S140 in FIG. 5). In step S230, lens data is read from the ROM 210, and the read lens data is transmitted as "lens-side determination data" to the body control device 109 (corresponding to step S150 in FIG. 5).

(Description of the shooting process)
FIG. 7 is a flowchart of the photographing process performed by the body control device 109 in the first control mode. First, in step S300, the body control device 109 receives a half-press operation of the release switch 120 made by the user. In step S310, the body control device 109 executes known automatic exposure (AE) control and automatic focusing (AF) control. The body control device 109 calculates the aperture diameter (aperture value) of the diaphragm 206 at the time of exposure, the exposure time of the image sensor 104, and the like by this AE control. Thereafter, in step S320, the body control device 109 receives the full-press operation of the release switch 120 performed by the user. The body control device 109 starts exposure control in response to this full-press operation.

  In step S330, the body control device 109 transmits the diaphragm drive time prediction command to the first lens control device 209a. The command includes a parameter corresponding to the aperture diameter (f-stop value) calculated in step S310. That is, the diaphragm drive time prediction command transmitted here is a command that causes the first lens control device 209a to predict the time required to drive the diaphragm 206 from the current aperture diameter to the aperture diameter calculated in step S310. It is.

  In step S340, the body control device 109 receives the estimated driving time of the diaphragm 206 from the first lens control device 209a. In step S350, an aperture drive command for driving the aperture 206 to the aperture diameter (aperture value) calculated in step S310 is transmitted to the first lens control device 209a. The command includes a parameter corresponding to the aperture diameter (f-stop value) calculated in step S310.

  In step S360, the body control device 109 determines whether the predicted driving time of the diaphragm 206 received in step S340 is larger than a predetermined threshold value. In this embodiment, this threshold value is taken as the value of the release time lag (for example, the time required to drive the quick return mirror 103 to the retracted position) in the camera body 100. That is, in step S360, it is determined whether the time required for preparation for photographing of the aperture 206 is larger than the time required for preparation for photographing on the camera body 100 side.

  If it is determined in step S360 that the predicted drive time is larger than the predetermined threshold, the process proceeds to step S370. In step S370, the body control device 109 waits for the time required to complete the drive of the aperture 206, and then proceeds to step S380. Here, the standby time is a time obtained by subtracting the release time lag on the camera body 100 side from the predicted driving time of the aperture 206. On the other hand, if the predicted drive time is equal to or less than the predetermined threshold value in step S360, the drive of the diaphragm 206 should be completed by the time the shooting preparation on the camera body 100 side is completed, as in step S370. The process proceeds to step S380 without providing a waiting time. In step S380, a photographing operation is performed. That is, the exposure of the imaging element 104 is performed, and the body control device 109 creates photographed image data based on the light reception output of the imaging element 104.

  FIG. 8 is a flowchart of the photographing process performed by the first lens control device 209a in the first control mode. First, in step S400, the first lens control device 209a receives a diaphragm drive time prediction command from the body control device 109 (corresponding to step S330 in FIG. 7). Then, in step S410, the parameters (diaphragm drive amount a and diaphragm drive speed v) included in the received diaphragm drive time prediction command and the lens data stored in the lens side ROM 210 (correction of the above-described arithmetic expression (1) Based on the term α), the drive time of the diaphragm 206 is predicted (a predicted drive time is calculated). In step S420, the predicted driving time calculated in step S410 is transmitted to the body control device 109 (corresponding to step S340 in FIG. 7).

  In step S430, the first lens control device 209a receives the diaphragm drive command from the body control device 109 (corresponding to step S350 in FIG. 7). Then, in step S440, the diaphragm drive unit 208 is controlled based on the parameters included in the received diaphragm drive command, and the diaphragm 206 is driven with the designated drive amount, drive direction, and drive speed.

  According to the camera system according to the first embodiment described above, the following effects can be obtained. (1) The first interchangeable lens 200a stores lens data related to the drive of the diaphragm 206 by the diaphragm drive unit 208 that drives the diaphragm 206, the optical system including the diaphragm 206 which is a driven member, and the diaphragm 206. And a lens side ROM 210. The first lens control device 209a is configured based on lens data stored in the lens ROM 210, and lens side determination data capable of determining whether the lens data is correctly stored in the lens ROM 210 Is sent to the camera body 100. Since this is done, on the camera body side, it is possible to judge the correctness of the lens data by using the lens data used in the actual photographing operation (diaphragm control operation). If "positive" is determined in this determination, it is assumed that the data held in the lens ROM 210 is highly safe, that is, the lens data stored in the lens ROM 210 is correctly stored. It can be handled. In this way, it is possible to handle the calculation of the predicted driving time of the diaphragm 206 performed at the time of the subsequent photographing operation as being properly performed.

(2) The body control device 109 is configured based on the lens data stored in the lens side ROM 210, and the camera body 100 can determine whether the lens data is correctly stored in the lens side ROM 210. The lens side determination data is received from the first interchangeable lens 200a, and it is determined whether the lens data is correctly stored in the lens side ROM 210 based on the lens side determination data. Since this is done, it is possible to judge the correctness of the lens data related to the diaphragm drive control before performing the actual photographing operation (diaphragm control operation), so it is possible to prevent photographing failure based on the erroneous lens side data in advance. .

(3) The first lens control device 209a predicts the drive time necessary for the diaphragm drive unit 208 to drive the diaphragm 206 by a predetermined amount at a predetermined speed based on the lens data stored in the ROM 210. . Since this is done, it is possible to allow the camera body 100 side to be linked temporally with the diaphragm drive on the interchangeable lens 200 side and the shutter drive on the camera body side, thereby shortening the release time lag. It can.

(4) The first lens control device 209a transmits lens data stored in the lens side ROM 210 to the camera body 100 as lens side determination data. The body control device 109 also receives lens data stored in the lens side ROM 210 from the first interchangeable lens 200 a as lens side determination data. Since this is done, the correctness of the lens side data (lens data) itself used for the actual photographing operation (diaphragm control operation) is judged. If "positive" is judged in this judgment, lens data can be treated as being correctly stored, and calculation of the predicted driving time of the diaphragm 206 performed at the time of the following photographing operation is also treated as properly performed. Can do.

Second Embodiment
The camera system according to the second embodiment of the present invention has the same configuration as that of the first embodiment except for a part. Hereinafter, differences from the first embodiment will be described. In the following description, the same parts as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description will be omitted.

  In the camera system according to the second embodiment, the simplified predicted drive time T 'related to the predicted drive time T of the diaphragm 206 described above is "a simpler method" than the first embodiment described above (for example, a simple calculation) A method that can be determined (generated) is provided separately from the prediction method of the predicted drive time T, and the lens-end determination data of the predicted aperture drive time (simple calculated value) determined by the simple method I assume.

Here, the above “simple method” will be described. In the first embodiment, the lens ROM 210 uses the arithmetic expression (1) “T = a / v + α” (diaphragm driving amount a, diaphragm driving speed v, predicted driving time T, correction term α) and correction terms as lens data. α is stored, and the predicted driving time T is calculated using this operational expression (1). On the other hand, in the lens side ROM 210 in the second embodiment, in addition to the combination of the arithmetic expression (1) and the correction term α, a simple arithmetic operation excluding the correction term α from the arithmetic expression (1) Expression (2) “T ′ = a / v” is also stored. The “simple method” in the second embodiment is to calculate (generate) “a simple predicted drive time T ′” using the simple arithmetic expression (2). As apparent from the equation (2), the “simple predicted driving time T ′” is a time calculated only by the diaphragm driving amount a and the diaphragm driving speed v.
The body control device 109 includes desired parameters (desired diaphragm drive amount (number of stages) a, desired diaphragm drive speed v) instead of the determination data request command described in the first embodiment, and A “simple aperture stop drive time prediction command” is requested to the first lens control device 209a, which requests the interchangeable lens 200a to calculate a predicted drive time T ′ ′.

  On the other hand, the body control device 109 stores in advance in the body side ROM 112 a simplified arithmetic expression “T ′ = a / v” having the same content as the above described simplified arithmetic expression (2) as the body side data. That is, the simplified computing equation “T ′ = a / v” is a computing equation stored in common in the body side ROM 112 and the lens side ROM 210 (in the following description, “the simplified computing equation (2) Sometimes called "formula").

  The body control device 109 exchanges the above-mentioned common arithmetic expression (body side data) stored in the body side ROM 112 after transmitting the “simple plate aperture drive time prediction command” to the first lens control device 209a. The diaphragm drive time is uniquely estimated based on the above-described desired parameters (diaphragm drive amount a, diaphragm drive speed v) transmitted to the lens 200a.

  Specifically, the above-described desired parameters (diaphragm drive amount a, diaphragm drive speed v) are applied to a common arithmetic expression included in the body side data to calculate a simple estimated drive time T '. Then, the simple predicted drive time T 'received from the first lens control device 209a is compared with the simple predicted drive time T' calculated by itself, and if the values match, the lens data in the lens side ROM 210 (It is assumed that not only the equation (2) but also the equation (1) and the correction term α) are correctly stored.

  FIG. 9 is a flowchart of the initialization process performed by the body control device 109 according to the second embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and thus the description thereof is omitted.

  If the body control device 109 determines in step S130 that the first interchangeable lens 200a is attached, the process proceeds to step S500. In step S500, a simplified plate aperture drive time prediction command including desired parameters (diaphragm drive amount a, aperture drive speed v) is transmitted from the body control device 109 to the first lens control device 209a. The parameter set here may be a fixed value (a predetermined parameter, that is, a combination of a predetermined diaphragm driving amount a and a predetermined diaphragm driving speed v), or a random number which is different every time the initialization process is performed. The value may be a combination of values with random values of both the diaphragm drive amount a and the diaphragm drive speed v, or a combination of random values of only one or the other. In the following step S510, a simple estimated drive time T 'is received from the first lens control device 209a.

  In step S520, the body control unit 109 stores the body side data (common arithmetic expression) stored in the body side ROM 112 and the parameters (diaphragm drive amount a, diaphragm drive speed v) of the diaphragm drive time prediction command transmitted in step S500. The driving time of the diaphragm 206 is easily predicted based on Then, in step S530, it is determined whether the simple predicted drive time T 'received in step S510 and the simple predicted drive time T' calculated in step S520 match. If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the simple predicted driving time T 'calculated on the body side in step S530 does not match the simple predicted driving time T' calculated on the lens side, the process proceeds to step S162. In this case, the body control device 109 controls the lens data stored in the lens side ROM 210 in the first interchangeable lens 200a (not only the arithmetic expression (2) but also the arithmetic expression (1) and the correction term α). However, it is assumed that the camera body 100 is broken due to strong electric impact such as static electricity, and the camera body 100 is set to a fourth control mode in which the drive of the diaphragm 206 is restricted.

  FIG. 10 is a flowchart of the initialization process performed by the first lens control device 209a according to the second embodiment. Note that steps S200 and S210 are the same as the lens initialization process (FIG. 6) in the first embodiment, so the description will be omitted.

  In step S600, the first lens control device 209a receives a “simple plate aperture drive time prediction command” from the body control device 109 (corresponding to step S500 in FIG. 9). In step S610, as in step S410 in FIG. 8, the parameters (diaphragm drive amount a, diaphragm drive speed v) included in the received simplified plate diaphragm drive time prediction command, and lens data (lens data stored in the lens ROM 210) The driving time of the diaphragm 206 is simply predicted (a simple predicted driving time T 'is calculated) based on the common arithmetic expression). In step S620, the simple predicted drive time T 'calculated in step S610 is transmitted to the body control device 109 (corresponding to step S510 in FIG. 9).

  According to the camera system of the second embodiment described above, the following effects can be obtained. (1) The first lens control device 209a transmits the simple predicted drive time T 'of the diaphragm 206 to the camera body 100 as lens side determination data. Further, the body control device 109 is a driving time required to drive the diaphragm 206 by an arbitrary amount (number of stages) at an arbitrary speed, which the first lens control device 209a simply predicted based on lens data (common arithmetic expression) A simple calculation result T ′ is received from the first interchangeable lens 200 a as lens side determination data. The body side ROM 112 in the camera body 100 stores lens data (common operation formula) identical to a part (common operation formula) of lens data stored in the lens side ROM 210 in the first interchangeable lens 200a. Ru. Based on lens data (common arithmetic expression) stored in the body side ROM 112, the body control device 109 simply predicts a driving time required to drive the diaphragm 206 by an arbitrary amount (number of stages) at an arbitrary speed, The simple predicted drive time T ′ is stored in the lens side ROM 210 by comparing the lens side determination data (a simple predicted drive time T ′ calculated on the lens side) received from the first interchangeable lens 200 a. The lens side judgment data can be treated as having high safety (the lens side judgment data stored in the lens side ROM 210 can be treated as being properly stored), and thus the lens side ROM Treating itself as having high security, that is, all lens data in the lens side ROM 210 (common arithmetic formula, arithmetic formula (1 The all three) of the correction term α as high safety (with regards to what is properly stored) can be handled. Since this is done, the safety of the lens data can be confirmed only by the calculation result of the simple predicted drive time T ', so the size of the lens side judgment data can be reduced and the communication load can be reduced. it can. In addition to the fact that lens data is stored correctly, it is possible to correctly calculate a simple predicted drive time T 'using the lens data (Equation (2) which is a part of Expression (1)). It is also possible to make a partial determination of equation (1).

Third Embodiment
The camera system according to the third embodiment of the present invention has the same configuration as that of the first embodiment except for a part. Hereinafter, differences from the first embodiment will be described. In the following description, the same parts as those in the first embodiment are given the same reference numerals as those in the first embodiment, and the description will be omitted.

  In the camera system according to the third embodiment, the body side data as described in the above embodiments are not stored in the body side ROM 112 of the camera body 100. The body control device 109 transmits, to the first lens control device 209a, two diaphragm drive time prediction commands in which the parameters are different (at least one of the diaphragm drive amount a and the diaphragm drive speed v differs). Then, it is determined whether the lens data is correctly stored in the lens side ROM 210 by determining whether the magnitude relationship between the two predicted drive times obtained by the respective commands is as expected.

  For example, the first diaphragm drive time prediction command (hereinafter sometimes referred to as “diaphragm drive time prediction command A”) has two stages of the diaphragm 206 at a predetermined diaphragm drive speed in a predetermined direction (diaphragm drive amount a = It is a command to predict the drive time when driving by 2 stages, and the second diaphragm drive time prediction command (hereinafter sometimes referred to as “diaphragm drive time prediction command B”) is the first diaphragm drive It is assumed that the command predicts the driving time when the diaphragm 206 is driven by four stages (diaphragm driving amount a = 4 stages) at the same diaphragm driving speed in the same direction as the time prediction command. In this case, the predicted drive time transmitted from the first lens control device 209a as a response to the first diaphragm drive time forecast command (v = predetermined speed, a = 2 stages, the above-mentioned operational formula (1) and correction) The time calculated using the term α) is the predicted drive time (v = predetermined speed, a = 4 stages), which is transmitted as a response to the second diaphragm drive time forecast command, and the above-mentioned formula (1) and It should be smaller than the time calculated using the correction term α. This is because the diaphragm drive amount (two stages) in the diaphragm drive time prediction command A is smaller than the diaphragm drive amount (four stages) in the diaphragm drive time prediction command B. Of course, the body control device 109 predicts, as a response to the diaphragm drive time prediction command B, a predicted drive time as a response to the diaphragm drive time prediction command A among the predicted drive times transmitted from the first lens control device 209a. It is expected in advance that it is shorter (shorter) than the driving time. Therefore, the first lens control device 209a can correctly predict the drive time of the diaphragm 206 by determining whether the first predicted drive time is smaller than the second predicted drive time. In other words, it is checked whether lens data is correctly stored in the lens side ROM 210. In the third embodiment, it is assumed that the first lens control device 209a can correctly predict the drive time of the diaphragm 206 when the first predicted drive time is smaller than the second predicted drive time. presume.

  FIG. 11 is a flowchart of lens initialization processing performed by the body control device 109 according to the third embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and thus the description thereof is omitted.

  If the body control device 109 determines in step S130 that the first interchangeable lens 200a is attached, the process proceeds to step S700. In step S700, the body control device 109 transmits a diaphragm drive time prediction command (hereinafter referred to as diaphragm drive time prediction command A) including a predetermined parameter to the first lens controller 209a. The parameter set here may be a fixed value or may be a random value different every time the initialization process is performed. In the following step S710, the predicted driving time (hereinafter referred to as a predicted driving time A) is received from the first lens control device 209a.

  In step S720, the body control device 109 transmits a diaphragm drive time prediction command (hereinafter referred to as diaphragm drive time prediction command B) including a parameter different from that transmitted in step S700. The parameters included in the diaphragm drive time prediction command B are parameters such that the prediction result of the drive time is surely larger than the parameters of the diaphragm drive time prediction command A. For example, the drive direction and the drive speed are the same, and the drive amount is larger for the diaphragm drive time prediction command B. Alternatively, the drive amount and the drive direction are made the same, and the drive speed is made smaller in the drive time prediction command B. In the following step S730, the predicted driving time (hereinafter referred to as a predicted driving time B) is received from the first lens control device 209a.

  In step S740, the body control device 109 determines whether or not the predicted driving time A received in step S710 is smaller than the predicted driving time B received in step S730. If the predicted driving time A is smaller than the predicted driving time B, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the predicted driving time A is equal to or greater than the predicted driving time B in step S740, the process proceeds to step S162. In this case, the body control device 109 considers that the lens data stored in the lens side ROM 210 in the first interchangeable lens 200 a has been damaged by a strong electrical impact such as static electricity, for example, and the diaphragm 206 In the camera body 100, a fourth control mode is set in which the driving of the camera is restricted.

  FIG. 12 is a flowchart of lens initialization processing performed by the first lens control device 209a according to the third embodiment. Steps S200 and S210 are the same as the initialization process (FIG. 6) in the first embodiment, and thus the description thereof is omitted.

  In step S800, the first lens control device 209a receives the “diaphragm drive time prediction command A” from the body control device 109 (corresponding to step S700 in FIG. 11). In step S810, as in step S410 in FIG. 8, the parameters (diaphragm drive amount a, diaphragm drive speed v) included in the received diaphragm drive time prediction command A, and lens data stored in the lens ROM 210 (the above The driving time of the diaphragm 206 is predicted (the predicted driving time A is calculated) based on the arithmetic expression (1) and the correction term α). In step S820, the predicted driving time A calculated in step S810 is transmitted to the body control device 109 (corresponding to step S710 in FIG. 11).

  The above-mentioned arithmetic expression (2) is stored as lens data stored in the lens side ROM 210, and the driving time of the diaphragm 206 is predicted using the arithmetic expression (2) in the above-mentioned step S810 (prediction (prediction) The driving time A may be calculated.

  In steps S830 to S850, similarly to steps S800 to S820, the "diaphragm drive time prediction command B" is received from the body control device 109 (corresponding to step S720 in FIG. 11) and the prediction drive is performed in the same manner as step S810. The time B is calculated and transmitted to the body control device 109 (corresponding to step S730 in FIG. 11).

  According to the camera system of the third embodiment described above, the following effects can be obtained. (1) The body control device 109 transmits two diaphragm drive time prediction commands including different parameters to the first lens control device 209a, and the first lens control device 209a transmits it as a response to these two commands. It is determined whether lens data is correctly stored in the ROM 210 (safety of lens data) by comparing two predicted drive times. Since this is done, it is possible to determine the safety of lens data without the need to store in advance the body side data used when determining the safety of lens data in the body side ROM 112 in the camera body 100. Can.

Fourth Embodiment
The camera system according to the fourth embodiment of the present invention has the same configuration as that of the first and second embodiments except for a part. Hereinafter, differences from the first and second embodiments will be described. In the following description, the same parts as those in the first and second embodiments will be assigned the same reference numerals as those in the embodiments and the description will be omitted.

  In the camera system according to the fourth embodiment, the predicted driving time T of the diaphragm 206 described above is calculated using the arithmetic expression (1) described in the first embodiment described above, and the calculated diaphragm prediction is performed. The driving time is set as lens side determination data.

  Although the body side ROM 112 in the fourth embodiment stores the above-mentioned equation (1) in advance, it does not store data (numerical data) of the correction term α. This is because the data of the correction term α may increase the data size even if it is data for only one interchangeable lens, and when trying to store the data of the correction term α of each of a plurality of interchangeable lenses in the body side ROM 112, For example, it may be necessary to add a memory (such as a ROM). Therefore, in the fourth embodiment, the data of the correction term α is not stored in advance in the body side ROM 112, and each time as necessary (a data request command of the correction term α is issued to the interchangeable lens side) The system is configured to receive data from the interchangeable lens side (lens side ROM 210). When the body control device 109 transmits the diaphragm drive time prediction command including the desired parameters (diaphragm drive amount a, diaphragm drive speed v) to the lens controller 209a, the data request command of the correction term α Send

  When receiving the diaphragm drive time prediction command, the lens control device 209 calculates the predictive drive time T using the arithmetic expression (1) stored in the lens side ROM 210 and the data of the correction term α. Also, upon receiving the data request command of the correction term α, the lens control device 209 extracts data of the correction term α appropriate to the desired parameter from among the plurality of data of the correction term α stored in the lens side ROM 210 . Then, the lens control device transmits the calculated predicted driving time T and the data (numerical data) of the extracted correction term α to the body side.

  When the body control device 109 receives the data of the correction term α from the lens side ROM 210, the received data of the correction term α and the above-mentioned arithmetic expression (1) (body side data) stored in the body side ROM 112 Prediction (calculation) of the diaphragm drive time is uniquely performed based on the above-mentioned desired parameters (diaphragm drive amount a, diaphragm drive speed v) transmitted to the interchangeable lens 200a. Then, the predicted driving time T received from the first lens control device 209a is compared with the predicted driving time T calculated by itself, and if the values match, the lens data in the lens ROM 210 (Equation (1)) And the correction term α) are correctly stored.

  FIG. 13 is a flowchart of the initialization process performed by the body control device 109 according to the fourth embodiment. Steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, and thus the description thereof is omitted.

  If the body control device 109 determines in step S130 that the first interchangeable lens 200a is attached, the process proceeds to step S900.

  In step S900, a drive time prediction command including desired parameters (diaphragm drive amount a, diaphragm drive speed v) is transmitted from the body control device 109 to the first lens control device 209a. The parameter set here may be a fixed value (a predetermined parameter, that is, a combination of a predetermined diaphragm driving amount a and a predetermined diaphragm driving speed v), or a random value which is different every time the initialization process is performed. The value may be a value (a combination of values with both the diaphragm drive amount a and the diaphragm drive speed v being random or a combination of random values with only one) may be used.

  In step S900, the body control device 109 transmits a command for requesting data of the correction term α described above to the first lens control device 209a. In response to the request command, the body control device 109 requests the lens control device 209 for data of the correction term α that is appropriate for the combination of the predetermined diaphragm drive amount a and the predetermined diaphragm drive speed v.

  In the following step S910, the predicted driving time T 'is received from the first lens control device 209a. Further, in step S910, the lens control device 209a receives numerical data of the correction term α extracted.

  In step S920, body-side data (calculation formula (1)) stored in the body-side ROM 112 by the body control device 109 and parameters of the diaphragm drive time prediction command transmitted in step S900 (diaphragm drive amount a, diaphragm drive speed v And the numerical value data of the correction term α acquired from the lens side in step S910, the driving time of the diaphragm 206 is simply predicted and calculated. Then, in step S930, it is determined whether the predicted driving time T received in step S910 matches the predicted driving time T calculated in step S920. If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the first control mode.

  On the other hand, if the predicted driving time T calculated on the body side in step S930 does not match the predicted driving time T calculated on the lens side, the process proceeds to step S162. In this case, the body control device 109 detects the lens data (at least one of the arithmetic expression (1) and the data of the correction term α) stored in the lens side ROM 210 in the first interchangeable lens 200a, for example, It is assumed that the camera body 100 is damaged due to a strong electric shock, and the fourth control mode in which the drive of the diaphragm 206 is restricted is set.

  FIG. 14 is a flowchart of the initialization process performed by the first lens control device 209a according to the fourth embodiment. Note that steps S200 and S210 are the same as the lens initialization process (FIG. 6) in the first embodiment, so the description will be omitted.

  In step S1000, the first lens control device 209a receives the “diaphragm drive time prediction command” and the “data request command for correction term α” from the body control device 109 (corresponding to step S900 in FIG. 13). In step S1010, as in step S410 of FIG. 8, the parameters (diaphragm drive amount a, diaphragm drive speed v) included in the received diaphragm drive time prediction command, and lens data (arithmetic formula stored in lens side ROM 210) Based on (1) and the numerical value data of the correction term α, the drive time of the diaphragm 206 is predicted and calculated (a predicted drive time T is calculated). In step S1020, the predicted driving time T calculated in step S1010 is transmitted to the body control device 109 (corresponding to step S910 in FIG. 13).

  According to the camera system of the fourth embodiment described above, the following effects can be obtained. (1) Since the safety of data stored in the lens side ROM 210 can be determined even if the body side ROM 112 does not hold data of the correction term α of a plurality of interchangeable lenses, the camera body The hardware configuration on the side can be simplified.

  The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.

(Modification 1)
In each of the above-described embodiments, an example in which the present invention is applied to lens data relating to driving of the stop 206 movable so as to change the size of the opening through which the light flux passes has been described. It is also possible to apply to For example, the present invention may be applied to lens data related to driving of the focusing lens 204 movable in the direction of the optical axis X of the optical system. That is, the first interchangeable lens 200 a may be configured to be able to predict the driving time of the focusing lens 204, and lens data related to the driving of the focusing lens 204 may be stored in the lens side ROM 210. Further, a shake correction lens (a lens movable to include a component in a direction perpendicular to the optical axis X) for correcting image shake of a subject image is added to the first interchangeable lens 200a, and the present invention is applied to this shake correction lens. It is also possible to apply

(Modification 2)
In the first embodiment, instead of transmitting all lens data to the camera body 100 as lens side determination data, only a part of the lens data may be generated as lens side determination data and transmitted to the camera body 100. Good. For example, when the lens data includes an arithmetic expression for predicting the driving time of the diaphragm 206 and its correction term, only the arithmetic expression may be generated and transmitted as lens side determination data. In this case, only the arithmetic expression may be stored in the body side ROM 112 in the camera body 100.

  Further, the lens side determination data may be data other than the above-described arithmetic expression of the predicted driving time and the correction term. For example, it may be a parameter other than the correction term given to the arithmetic expression of the predicted drive time, or data (for example, data “1 LSB”) representing a unit of drive control of the diaphragm 206 (drive unit of the diaphragm drive unit 208) It may be the number of diaphragm drive stages). Also, it may be data representing whether or not lens data is stored in the lens side ROM 210.

(Modification 3)
The timing at which the body side determination data is stored in the body side ROM 112 in the camera body 100 may be, for example, when manufacturing the camera body 100 or when the interchangeable lens is attached to the camera body 100 for the first time May be In the latter case, normal lens-side determination data is stored at the time of initial wearing, and thereafter lens data is determined each time the interchangeable lens is attached.

(Modification 4)
In each embodiment mentioned above, although judgment of lens data was performed in initialization processing, the present invention is not limited to such an embodiment. For example, when the digital camera 1 is in the power-on state, determination of lens data may be performed at predetermined time intervals, or determination may be performed each time shooting is performed.

(Modification 5)
In the second embodiment, when comparing two predicted drive times, the two values may not necessarily match exactly. For example, depending on the precision of the floating point operation and the like, an error may occur in the two predicted drive times, so that the difference between the two predicted drive times may be determined as matching if the difference is less than or equal to a predetermined threshold. .

(Modification 6)
In the second embodiment, although the lens control device 209a simply calculates the diaphragm drive time using the common calculation formula, it is not such a calculation formula, but a table (for example, the diaphragm drive amount a and the diaphragm drive speed v It may be configured to obtain a simple diaphragm drive prediction time T ′ using a two-dimensional table (which is a parameter). In this case, the body control device 109 is also configured to have a table having the same content as this calculation table.

(Modification 7)
In each embodiment described above, when the fourth control mode is set (when it is determined that the lens data is not stored correctly), the diaphragm drive command is not transmitted to the first lens control device 209a, and the diaphragm Although the photographing operation or the like is performed while the aperture diameter of the lens 206 is fixed, an operation different from those in the respective embodiments may be adopted as the operation when the lens data is not stored correctly. For example, the drive speed of the diaphragm 206 may not be specified but the diaphragm drive may be performed (a diaphragm drive command not including the drive speed parameter is transmitted) (ie, the “second control mode in the above embodiment The power supply to the interchangeable lens may be stopped, or photography using the interchangeable lens may be prohibited.

(Modification 8)
In the second embodiment, the simplified plate diaphragm drive time prediction command transmitted by the body control device 109 at the time of determination may be the same as the diaphragm drive time prediction command used at the time of photographing. That is, the arithmetic expression (1) stored in the lens side ROM 210 of the interchangeable lens 200 mounted on the body side mount portion, the arithmetic expression (1) identical to the correction term α, and the correction term α If stored in the ROM 112, the same determination as in the second embodiment can be made without using a separate common arithmetic expression (without being stored in each other's ROM).

(Modification 9)
In each of the above embodiments, the lens control device 209a calculates the diaphragm driving time T using the arithmetic expression (1) and the correction term α, but this is not the arithmetic expression but a table (for example, diaphragm driving) It is a two-dimensional table that uses the amount a and the aperture drive speed v as parameters, and the aperture drive prediction time T is calculated using the values in the table in which the correction term α is added in advance) Also good.

(Modification 10)
In the third embodiment, the first lens control is performed when the predicted driving time as a response to the diaphragm driving time prediction command A is smaller (shorter) than the predicted driving time as a response to the diaphragm driving time prediction command B. The apparatus 209a is configured to determine that the driving time of the diaphragm 206 can be correctly predicted (lens data is correctly stored in the lens side ROM 210). However, the determination of the magnitude relationship may be reversed. That is, the body control device 109 sets the diaphragm drive amount in the diaphragm drive time prediction command A larger than the diaphragm drive amount in the diaphragm drive time prediction command B, and the first predicted drive time is the second one. It is determined whether or not it is larger than the predicted driving time (if it is larger, the first lens control device 209a can correctly predict the driving time of the aperture 206, that is, the lens data is correctly stored in the lens side ROM 210) And may be determined.

(Modification 11)
In the third embodiment and the modification 10 described above, the first lens control device 209a determines and calculates the predicted driving time in accordance with the diaphragm driving time prediction commands A and B from the body control device 109, respectively. The predicted driving time is configured to be transmitted to the body control device 109. Further, the body control device 109 is configured to compare the two predicted drive times received from the lens control device 209a with each other to determine the magnitude. However, as the body control device 109 receives the two predicted drive times and does not perform the comparison operation, the magnitude relationship between the two predicted drive times (times A and B) (in the third embodiment, "time A It is sufficient to know only <time B ”and“ time A> time B ”in the modification 10. Therefore, after the lens control device 209a calculates two predicted drive times, the lens controller 209a compares the magnitude relationship between the two predicted drive times, and information indicating the comparison result (size of the calculated two predicted drive times Information indicating a relationship, for example, information indicating “time A <time B” in the third embodiment, and “information indicating time A> time B” in the tenth modification, is sent to the body control device 109. It may be configured to transmit.

(Modification 12)
In the second embodiment, the body control device 109 also performs simple prediction of the diaphragm drive time independently using the above-mentioned "common arithmetic expression". However, instead of the body control device 109 performing the simple prediction (calculation) using the “common calculation formula”, the table information (described later) (body side data) stored in advance in the body side ROM 112 is used. The “simple predicted driving time T ′” of may be obtained. Specifically, in the body side ROM 112, a desired parameter (combination of the desired diaphragm drive amount a and the desired diaphragm drive speed v) and the "simple predicted drive time T '" corresponding to each combination thereof The table information (body side data) to be configured is stored. Then, the body control device 109 selects, from the table information, “simple predicted drive time T ′” to be used as a comparison target according to the desired parameters (diaphragm drive amount a and diaphragm drive speed v) sent as a command to the lens side. Do. Then, the body control device 109 compares the “simple predicted driving time T ′” transmitted from the lens control device 209 a with the “simple predicted driving time T ′” selected from the table information described above. The subsequent processing is the same as that of the second embodiment. In this way, the body control device 109 can compare “simple predicted driving times T ′” without performing an operation using a common arithmetic expression.

  Hereinafter, a modification 12 which is a modification of the second embodiment will be described using FIGS. 15 and 16. In the following description, the same parts as those of the second embodiment are denoted by the same reference numerals as those of the second embodiment, and the description thereof is omitted.

  FIG. 15 is a view showing an example of table information stored in the body side ROM 112. As shown in FIG. The body side ROM 112 stores table information 10 in place of the above-described “simple arithmetic expression (2)“ T ′ = a / v ””. The table information 10 includes a plurality (five in FIG. 16) of sets in which simple predicted drive times T 'are associated with parameters including the aperture drive amount a and the aperture drive speed v. In the following description, this set is called a parameter set (body-side data). The simple predicted drive times T1 'to T5' shown in FIG. 15 are, for example, the aforementioned "simple arithmetic formula (2)" stored in advance in a computer or the like installed in a factory where this camera system is manufactured. The values are calculated in advance by substituting the diaphragm drive amounts a1 to a5 and the diaphragm drive speeds v1 to v5 shown in FIG. This table information is stored in the body side ROM 112 at the time of factory shipment or the like.

  FIG. 16 is a flowchart of the initialization process performed by the body-side control device 109 according to the modification 12. The operations in steps S100 to S131 are the same as those in the flowchart shown in FIG.

  When the first interchangeable lens 200a is attached to the camera body 100, the body side control device 109 makes a negative determination in step S130, and the process proceeds to step S1090. In step S1090, the body control device 109 selects any one parameter set from the table information 10 stored in the body side ROM 112.

  In the subsequent step S1100, the body control device 109 transmits a simplified plate aperture drive time prediction command to the first lens control device 209a. This command includes the diaphragm drive amount and the diaphragm drive speed of the parameter set selected in step S1090. For example, when the first set is selected in step S1090, the command transmitted in step S1100 includes the diaphragm drive amount a1 and the diaphragm drive speed v1.

  In the next step S510, the body control device 109 receives, from the first lens control device 209a, the simple estimated drive time T 'calculated by the first lens control device 209a. The first lens control device 209a calculates the predicted drive time T ′ by applying the diaphragm drive amount and the diaphragm drive speed included in the command transmitted in step S1100 to the above-described simple arithmetic expression (2). Value. For example, when the first set is selected in step S1090, the first lens control device 209a calculates a simple estimated drive time T 'using the diaphragm drive amount a1 and the diaphragm drive speed v1.

  Then, in step S1120, the body control device 109 acquires, from the table information 10, a simple estimated drive time T 'included in the parameter set selected in step S1090. For example, when the first set is selected in step S1090, in step S1120, a simple estimated drive time T1 'included in the first set is acquired. Thereafter, in step S1130, the body control device 109 determines whether the simple predictive drive time T 'received in step S510 and the simple predictive drive time T' (for example, T1 ') acquired in step S1120 match. Determine If these two values match, the process proceeds to step S161, and the body control device 109 sets the control mode of the camera body 100 to the above-described first control mode. On the other hand, when the two values do not match in step S1130, the process proceeds to step S162, and the above-described fourth control mode is set to the camera body 100.

  In the modification 12, the operation of the first lens control device 209a is the same as the flowchart shown in FIG.

  By the way, in the modification 12 described above, when the simple predicted driving times T1 ′ to T5 ′ in the table information 10 are calculated in advance, and the simple predicted driving time T ′ received from the interchangeable lens in step S510 of FIG. As a computing equation used when computing on the interchangeable lens side, the simple computing equation (2) “T ′ = a / v” is used. However, instead of this simple arithmetic expression (2), the above-mentioned arithmetic expression (1) “T = a / v + α (T = α + a / v)” may be used.

  Further, although the modification 12 described the example in which the table information 10 includes five parameter sets of the first to fifth sets, the number of parameter sets is not limited to five, and may be more or less than this. Good. For example, the table information 10 may include only one parameter set. However, if two or more parameter sets are included in the table information 10, the two or more parameter sets may be sequentially transmitted to the interchangeable lens side, and the simple estimated driving time T 'may be checked for each of them. Since it becomes possible and the effect of safety confirmation of lens data stored in the lens side ROM 210 can be enhanced, the table information 10 preferably includes a plurality of parameter sets.

(Modification 13)
In each embodiment and each modification described above, in the control on the camera body side, an operation of determining whether the body control device sets the above-described first control mode or the above-described fourth control mode (For example, step S160 in FIG. 5, step S530 in FIG. 9, step S1130 in FIG. 15, etc.) are performed only once. The camera body may be configured to perform this determination multiple times. Alternatively, this determination is performed once and the first or fourth control mode is set, and then again at a predetermined timing (for example, when re-determination is requested or when a predetermined time has elapsed since the previous determination). This determination may be made. Alternatively, this determination may be repeated at predetermined intervals.

  When this re-judgment is performed, the camera body side requests the interchangeable lens side to transmit the lens side judgment data to the camera body again, and the camera body side is compared with the lens side judgment data. Will work to prepare the data for If an example is given in FIG. 15, the operation from step S1090 to step S1130 will be repeated again.

  The present invention is not limited to the above embodiment as long as the features of the present invention are not impaired, and other embodiments considered within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 100 ... Camera body, 101 ... Body side mount part, 102, 202 ... Several electric contacts, 103 ... Quick return mirror, 104 ... Image sensor, 105 ... Submirror, 106 ... Focus detection apparatus, 107 ... Finder screen, 108 ... Penta Prism, 109: Body control device, 110: Eyepiece lens, 111: In-body diaphragm drive unit, 112, 210: ROM, 120: Release switch, 200a: First interchangeable lens, 200b: Second interchangeable lens, 200c: Third interchangeable lens, 201: lens side mount portion, 204: focusing lens, 206: aperture, 207: lens drive portion, 208: aperture drive portion, 209a: first lens control device, 209b: second lens control Device, 209c ... third lens controller

Claims (12)

An interchangeable lens that communicates with the camera body,
A driven part,
A drive unit for driving the driven unit;
A receiving unit that receives, from the camera body, first information including a desired driving speed and a desired driving amount related to driving of the driven unit;
A storage unit for storing third information used when determining, using the first information, second information related to a drive time when driving the driven unit at the drive speed by the drive amount ;
A transmitter configured to transmit the second information obtained based on the first information and the third information to the camera body;
A control unit that controls the drive unit and the transmission unit;
The interchangeable lens that causes the camera body to transmit the second information to the transmission unit without the drive unit driving the driven unit based on the first information. The interchangeable lens according to claim 1,
The interchangeable lens, wherein the third information includes an arithmetic expression that divides the drive amount by the drive speed. The interchangeable lens according to claim 1,
The interchangeable lens according to the present invention, wherein the third information includes a table for obtaining the second information using the drive amount and the drive speed as parameters. The interchangeable lens according to claim 2 or 3, wherein
The interchangeable lens that receives the first information in an initial communication that performs information communication with the camera body regarding the type of the interchangeable lens. The interchangeable lens according to claim 4,
The receiving unit receives the first information together with a drive command for driving the driven unit after the initial communication is performed,
The storage unit further stores sixth information to be used when obtaining fifth information which is information on the driving time and is different from the second information using the first information received together with the driving command. interchangeable lens. The interchangeable lens according to claim 5, wherein
The interchangeable lens, wherein the sixth information includes an arithmetic expression having a correction term not included in the third information. The interchangeable lens according to claim 5 or 6,
The interchangeable lens, wherein the control unit causes the camera body to transmit the fifth information to the transmission unit, and causes the drive unit to drive the driven unit based on the first information. The interchangeable lens according to claim 7, wherein
An optical system including the driven portion;
The driven portion changes a size of a member movable in the optical axis direction of the optical system, a movable member so as to include a component in a direction perpendicular to the optical axis direction, or an opening through which a light beam passes. Interchangeable lens containing any of the movable members. A driven unit, a driving unit for driving the driven unit, and an arithmetic expression for calculating a driving time necessary for driving the driven unit by a desired driving amount at a desired driving speed. An attachment unit for attaching an interchangeable lens having a storage unit for storing lens data related to driving of a driven unit;
A transmitter configured to transmit, to the interchangeable lens, first information including a predetermined driving speed and a predetermined driving amount;
After the transmission of the first information by the transmission unit, the lens data is correctly stored in the storage unit as the drive time calculated by applying the information contained in the first information to the arithmetic expression in the interchangeable lens. A receiving unit that receives data from the interchangeable lens as lens-side determination data that can determine whether the
A determination unit that determines whether the lens data is correctly stored in the storage unit based on the lens-side determination data received by the reception unit. The camera body according to claim 9,
The transmitter is configured to transmit at least one of the driving speed and the driving amount included in the first information to the interchangeable lens when transmitting the first information to the interchangeable lens. A camera body that transmits different values from information. The camera body according to claim 9 or 10
A storage unit configured to store body side data to be compared with the lens side determination data received by the reception unit;
The determination unit performs the determination based on the body side data and the lens side determination data received by the receiving unit. In the camera body according to claim 11,
The body side data includes information on a drive time required to drive the driven portion by the desired drive amount at the desired drive speed, the desired drive speed, and the desired drive amount. Camera body which is the data which matched.

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