JP6760349B2 - interchangeable lens - Google Patents

Description

The present invention relates to an interchangeable lens.

Conventionally, in a so-called single-lens reflex type camera system, an interchangeable lens capable of calculating the driving time of an aperture is known. For example, Patent Document 1 describes a configuration in which a lens microcomputer in an interchangeable lens calculates an aperture drive time from aperture speed information previously stored in an internal memory and drive amount information received from a camera microcomputer. Has been 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 by a strong electrical impact or the like.

Japanese Unexamined Patent Publication No. 2006-20897

The interchangeable lens according to one aspect of the present invention is an interchangeable lens that communicates with the camera body, and is a desired drive speed and desired with respect to the driven portion, the drive portion that drives the driven portion, and the drive of the driven portion. First information including the driving amount of the camera body is received from the camera body, and second information regarding the driving time of the driven unit obtained based on the first information is transmitted to the camera body. The receiving unit includes a unit, a driving unit, and a control unit that controls the transmitting unit, and the receiving unit receives the third information instructing the driving of the driven unit from the camera body before receiving the third information. 1 Receive information.

It is a perspective view which shows the structure of the camera system which concerns on 1st Embodiment. It is a schematic sectional view of the camera body 100 and the first interchangeable lens 200a. It is a schematic cross-sectional view of the camera body 100 and the second interchangeable lens 200b. It is a schematic sectional view of the camera body 100 and the third interchangeable lens 200c. It is a flowchart of the initialization process executed by the body control device 109. It is a flowchart of the initialization process executed by the 1st lens control device 209a. It is a flowchart of the photographing process executed by the body control device 109 in the 1st control mode. It is a flowchart of the photographing process executed by the 1st lens control apparatus 209a in the 1st control mode. It is a flowchart of the initialization process executed by the body control device 109 which concerns on 2nd Embodiment. It is a flowchart of the initialization process executed by the 1st lens control device 209a which concerns on 2nd Embodiment. It is a flowchart of the initialization process executed by the body control device 109 which concerns on 3rd Embodiment. It is a flowchart of the initialization process executed by the 1st lens control apparatus 209a which concerns on 3rd Embodiment. It is a flowchart of the initialization process executed by the body control device 109 which concerns on 4th Embodiment. It is a flowchart of the initialization process executed by the 1st lens control apparatus 209a which concerns on 3rd Embodiment. It is a figure which shows the storage content of the body side ROM which concerns on a modification. It is a flowchart of the initialization process executed by the body control device 109 which concerns on a modification.

(First Embodiment)
Hereinafter, the camera system according to the first embodiment to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a camera system according to the first embodiment. The digital camera system shown in FIG. 1 includes a camera body 100 and a first interchangeable lens 200a that can be attached to the camera body 100. In addition to the first interchangeable lens 200a, a second interchangeable lens 200b and a 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 portion 101. When the lens-side mount portion 201 of the first interchangeable lens 200a is fitted and fixed to the body-side mount portion 101, a plurality of electrical contacts 202 provided in the lens-side mount portion 201 are provided in a plurality of body-side mount portions 101. It is electrically connected to the electrical contact 102. Further, the camera body 100 is provided with a release switch 120 capable of performing a half-press operation and a full-press operation.

(Explanation 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 200a has an imaging optical system that receives a light flux from the subject and forms a subject image on an imaging surface. This imaging optical system is composed of a plurality of lenses 203, 204, 205 and an aperture 206. Of these, the lens 204 is a focusing lens that can move in the direction of the optical axis X. The camera body 100 has an image sensor 104 that captures a subject image formed by an imaging optical system, converts the subject image into an electric signal, and outputs the image. The image sensor 104 is a solid-state image sensor such as a CCD or CMOS. Although omitted in FIG. 2, an infrared cut filter for cutting infrared light, an optical low-pass filter for preventing image folding noise, and the like are arranged on the image pickup surface of the image sensor 104. There is.

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

The subject light reflected by the reflecting surface of the quick return mirror 103 passes through the finder screen 107, is introduced into the pentaprism 108 (pentagonal roof prism), and is 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 a part of the subject light is transmitted through this half mirror portion. This transmitted luminous flux 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 in the lower part of the camera body 100. The focus detection device 106 detects the focus adjustment 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 part (retracted position) of the finder screen 107. When the quick return mirror 103 and the sub mirror 105 move to the retracted position, the subject light transmitted through the imaging optical system is introduced into the image sensor 104. After that, the image sensor 104 takes an image of the subject imaged on the image pickup surface.

The first interchangeable lens 200a includes a first lens control device 209a that controls each part of the first interchangeable lens 200a. Further, 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 bidirectional by transmitting and receiving electric signals via a plurality of electric contacts 102 and 202 provided on the mount portions on the camera body side and the interchangeable lens side, respectively. Data communication can be performed.

The first interchangeable lens 200a includes a lens drive unit 207 that drives the focusing lens 204 in a direction along the optical axis X, and an aperture drive unit that drives the aperture 206 so as to change the size of the aperture through which the subject light passes. It includes 208. The lens drive unit 207 and the aperture drive unit 208 each include an actuator (for example, a stepping motor) (not shown), and the focusing lens 204 or the focusing lens 204 or the like according to the drive speed, drive amount, and drive direction given by the first lens control device 209a. Drives the aperture 206.

The camera body 100 includes an in-body diaphragm drive unit 111 having an actuator (not shown). When an interchangeable lens (described later) that does not have a drive mechanism for the diaphragm 206 is attached, the diaphragm drive unit 111 in the body 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 an aperture drive unit 208, the in-body aperture drive unit 111 does nothing when the first interchangeable lens 200a is attached.

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

The first lens control device 209a determines whether or not the lens data is correctly stored in the lens side ROM 210 based on the lens data (details will be described later) stored in the lens side ROM 210 on the camera body 100 side (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. Judge whether or not. This determination will be described in detail later.

(Explanation of aperture drive)
Before starting the control of the aperture drive on 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 101 is (type of interchangeable lens). It is recognized by the initial communication with the interchangeable lens 200 via the above-mentioned electric contacts 102 and 202. Whether the body control device 109 is the first interchangeable lens 200a or the second interchangeable lens 200b based on the content of the lens data (or whether or not the lens data is acquired) acquired from the interchangeable lens 200 side by the initial communication. Or, it is identified whether it is the third interchangeable lens 200c.

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

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

The diaphragm drive command includes parameters representing the drive amount, drive direction, and drive speed of the diaphragm 206. For example, suppose that the current aperture diameter of the diaphragm 206 is a size equivalent to F2, and it is desired to change this 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 stages", the drive direction to "aperture direction", and the drive speed to "maximum speed" to the first lens control device 209a. Here, when the lens control device 209a of the interchangeable lens 200a receives an aperture drive command for setting the drive speed to "maximum speed" from the body control device 109, the interchangeable lens 200a itself (aperture drive unit 208 itself) is driven. The aperture 206 is driven and controlled to the target aperture position (drive amount) at the maximum aperture drive speed that can be achieved.

When the drive amount of the aperture 206 is defined as "the number of aperture stages from the open F value", the parameter representing the "drive direction" is set to the "aperture drive command" independently of the "drive amount". It is not necessary to include it in.

The body control device 109 usually specifies "maximum speed" as the drive speed of the aperture 206. On the other hand, (1) when it is desired to reduce the power consumption of the first interchangeable lens 200a, (2) when it is desired to reduce the operating noise of the first interchangeable lens 200a, and (3) when the aperture 206 is driven during video recording. In a situation corresponding to any of the above, the body control device 109 transmits an aperture drive command in which a value other than "maximum speed" is specified as the drive speed to the first lens control device 209a.

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

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

Here, the "aperture drive time prediction command" output from the camera body 100 side to the interchangeable lens 200 side will be described. The aperture drive time prediction command is to drive the aperture 206 to the aperture drive unit 208 on the interchangeable lens 200 side at the aperture drive speed (number of stages) specified from the camera body 100 side. The interchangeable lens 200 side (first lens control device 209a) predicts (for example, a prediction calculation) how long the driving time will be required, and the prediction (for example, prediction calculation) result is obtained on the camera body 100 side. It is a command to output (send) to.

When the camera body side (body control device 109) receives the prediction result (predicted drive time of the aperture), the camera body side uses the predicted drive time for timing control related to shooting operation, for example, timing control related to exposure processing. Timing control related to exposure processing includes, for example, control of shutter opening / closing timing in still image shooting, and so that exposure does not change even if the aperture value (aperture aperture size) is changed during moving image shooting (exposure amount is constant). ), Timing control of the shooting sensitivity when changing the shooting sensitivity according to the movement of the aperture.

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

The first lens control device 209a predicts the drive time based on the lens data stored in the lens side 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 the predicted drive time T from the above-mentioned aperture drive amount a and aperture drive speed v. An example of the calculation formula is shown in the following formula (1).
T = a / v + α ・ ・ ・ (1)

Here, α is a correction term for the aperture drive time. For example, the delay time from the start of the drive control of the aperture 206 to the actual start of the drive of the aperture 206, or the aperture 206 after being driven by the target drive amount. It is determined in consideration of the time until the 206 is stationary and stable. A different value of this correction term α is stored for each interchangeable lens. Further, depending on the type of interchangeable lens, different values may be stored depending on the setting conditions of the lens (for example, in the case of a zoom lens, depending on the focal length). The lens data of the lens-side ROM 210 also includes the value of the correction term α, and the value is determined at the time of designing the first interchangeable lens 200a. For example, if the aperture drive amount a is "2 steps", the aperture drive speed v is "10 steps / sec", and the correction term α is "0.1 sec", the first lens control is performed by the above equation (1). The device 209a predicts the predicted drive time T to be 0.3 seconds. It should be noted that a plurality of the above-mentioned correction terms α may be stored (provided) according to the driving speed and the driving amount (number of stages).

The body control device 109 controls the release timing in still image shooting based on the predicted drive time T predicted as described above.

(Explanation of Digital Camera System with 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, the difference between the second interchangeable lens 200b and 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 above-mentioned electrical contacts 102 and 202, and based on the communication result, the body side mount portion 101 is replaced with a second lens. It is identified that the lens 200b is attached.

Unlike the first lens control device 209a, the second lens control device 209b does not correspond to the designation of the drive speed of the aperture 206. Therefore, the body control device 109 issues a second aperture drive command whose contents are different from those described above (aperture drive command sent to the first lens control device 209a), that is, an aperture drive command whose contents do not include the aperture drive speed. It is transmitted to the lens control device 209b of.

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

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

By the way, the form of the aperture drive command is not limited to the above-mentioned form (a form in which the first interchangeable lens 200a and the second interchangeable lens 200b use different commands), for example, the first interchangeable lens 200a and the first interchangeable lens 200a. It is also possible to share the aperture drive command output by the body control device 109 with the interchangeable lens 200b of 2. If such a common aperture drive command is used, the second lens control device 209b refers to the aperture 206 drive amount and drive direction parameters included in the aperture drive command, but the aperture. It is configured so as not to refer to the parameter representing the drive speed of 206. By configuring the second lens control device 209b in this way, when the second interchangeable lens 200b is attached to the camera body 100 as described above, the aperture 206 is always driven at a predetermined speed (for example, the maximum speed). Will be.

(Explanation of digital camera system with 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, the differences between the third interchangeable lens 200c and the first interchangeable lens 200a 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 above-mentioned electrical contacts 102 and 202, and based on the communication result, the body side mount portion 101 is replaced with a third lens. It is identified that the lens 200c is attached.

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

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

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

(Explanation of initialization processing in a digital camera system of a camera body 100 and an interchangeable lens 200)
Next, the initialization process executed by the body control device 109 and the control device 209 for each lens (particularly, the first lens control device 209a) will be described. The body control device 109 is, for example, when an 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. For example, the initialization process is executed at a predetermined timing. The body control device 109 sets any of the first to fourth control modes in the camera body 100 in the initialization process 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 "lens control device".

FIG. 5 is a flowchart of the initialization process executed by the body control device 109. First, after the 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 above command. The lens function data is data for determining the function of the interchangeable lens, for example, the presence / absence of the aperture drive unit 208, whether or not the drive speed of the aperture 206 can be specified, and the maximum drive speed at which the aperture 206 can operate (described above). It contains information such as the maximum speed of the aperture and the presence or absence of a zoom mechanism.

In step S120, it is determined from the contents of the lens function data received in step S110 whether or not the interchangeable lens attached to the body-side mount portion 101 is the third interchangeable lens 200c. For example, if it is recognized from the lens function data that the aperture drive unit 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 controls the drive of the aperture 206 by the in-body aperture drive unit 111, and does not send an aperture drive command to the lens control device.

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 contents of the lens function data received in step S110 whether or not the interchangeable lens attached to the body-side mount portion 101 is the second interchangeable lens 200b. For example, if it is recognized from the lens function data that the driving speed of the aperture 206 cannot 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 controls the drive of the aperture 206 by transmitting an aperture drive command to the lens control device, and the transmitted aperture drive command drives the aperture 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, when the first interchangeable lens 200a is attached. 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 above command. In the present embodiment, the lens-side determination data used for determination on the camera body side is the lens data itself stored in the lens-side ROM 210. As described above, the lens data is used in the calculation formula (1) "T = a / v + α" for calculating the predicted drive time T from the aperture drive amount (number of drive stages) a and the aperture drive speed v, and the calculation formula. The correction term α of the aperture drive time to be performed is included. Therefore, the lens control device 209a transmits the calculation formula (1) “T = a / v + α” and the correction term α generated based on the lens data to the camera body as the lens side determination data. The lens-side ROM 210 stores the correction term α as numerical data and the calculation formula (1) as character string data, and the lens control device 209a transmits these numerical data and character string data to the camera body. To 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. To do. The content of the body-side determination data of the present embodiment is the lens-side determination data itself (that is, the above-mentioned calculation formula (1) and correction term α) stored in advance in the body-side ROM 112. That is, in the present embodiment, the determination data (calculation formula (1) “T = a / v + α” and the correction term α) having the same contents are stored in advance in the body side ROM 112 and the lens side ROM 210, respectively, and in step S160. The body control device 109 determines whether or not 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 controls the drive of the aperture 206 by transmitting an aperture drive command including the drive speed of the aperture 206 to the lens control device. When the first control mode is set, the body control device 109 transmits an aperture drive time prediction command to the lens control device 209 before driving the aperture 206 to obtain a predicted drive time, and this predicted drive time is obtained. Drive control of the aperture 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 the lens data stored in the ROM 210 in the first interchangeable lens 200a has been damaged by a strong electrical impact such as static electricity, and drives the aperture 206. A fourth control mode with restrictions on the camera body 100 is set. In the fourth control mode, the body control device 109 does not send an aperture drive command to the first lens control device 209a, and performs an imaging operation or the like while keeping the aperture diameter of the aperture 206 fixed. In addition, a message indicating that the stored contents of the ROM 210 are inconsistent (there is a problem on the lens side) is displayed on a display device (liquid crystal display, etc.) (not shown) (so-called warning display), and a message is displayed. , Notify the user that the control of the aperture 206 is restricted.

In the present embodiment, the content of the above-mentioned "fourth control mode" has been described as displaying the above-mentioned message and limiting the control of the aperture 206. However, the setting content of the fourth control mode is not limited to this. For example, the content of the fourth control mode may be limited to the warning display as described above. Alternatively, a stronger limit, for example, the power supply from the camera body side to the accessory side may be restricted (for example, the power supply to be supplied to the aperture drive system is prohibited). Alternatively, it may be configured to prohibit a shooting operation with a stronger restriction, for example, on the camera body side.

Further, the warning display method is not limited to the above-mentioned message display, and any display form may be used as long as it can convey a warning to the user that an abnormality has occurred on the lens side. For example, a blinking or lighting warning display using an LED or the like may be used. Alternatively, a simple message display (for example, "aperture NG") indicating that the aperture control is restricted 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 the lens initialization process executed 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, a "determination data request command" is received from the body control device 109 (corresponding to step S140 in FIG. 5). In step S230, the lens data is read from the ROM 210, and the read lens data is transmitted to the body control device 109 as "lens side determination data" (corresponding to step S150 in FIG. 5).

(Explanation of shooting process)
FIG. 7 is a flowchart of the photographing process executed by the body control device 109 in the first control mode. First, in step S300, the body control device 109 accepts a half-press operation of the release switch 120 performed by the user. In step S310, the body control device 109 performs well-known autoexposure (AE) control and autofocus adjustment (AF) control. The body control device 109 calculates the aperture diameter (aperture value) of the aperture 206 at the time of exposure, the exposure time of the image sensor 104, and the like by this AE control. After that, in step S320, the body control device 109 accepts the fully pressed operation of the release switch 120 performed by the user. The body control device 109 starts exposure control in response to this full push operation.

In step S330, the body control device 109 transmits an aperture drive time prediction command to the first lens control device 209a. This command includes parameters corresponding to the aperture diameter (aperture value) calculated in step S310. That is, the aperture 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. Is.

In step S340, the body control device 109 receives the predicted drive time of the aperture 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. This command includes parameters corresponding to the aperture diameter (aperture value) calculated in step S310.

In step S360, the body control device 109 determines whether or not the predicted drive time of the aperture 206 received in step S340 is greater than a predetermined threshold value. In the present embodiment, this threshold value is set as the value of the release time lag in the camera body 100 (for example, the time required to drive the quick return mirror 103 to the retracted position). That is, in step S360, it is determined whether or not the time required for the shooting preparation of the aperture 206 is longer than the time required for the shooting preparation on the camera body 100 side.

If it is determined in step S360 that the predicted drive time is greater than a predetermined threshold value, the process proceeds to step S370. In step S370, the body control device 109 waits for a time required to complete the drive of the diaphragm 206, and then proceeds to step S380. The waiting time here is the time obtained by subtracting the release time lag on the camera body 100 side from the predicted drive time of the aperture 206. On the other hand, if the predicted drive time is equal to or less than a predetermined threshold value in step S360, the drive of the aperture 206 should be completed by the time the camera body 100 side is ready for shooting, so that the drive of the aperture 206 should be completed. The process proceeds to step S380 without providing a waiting time. In step S380, a shooting operation is executed. That is, the image sensor 104 is exposed, and the body control device 109 creates captured image data based on the light receiving output of the image sensor 104.

FIG. 8 is a flowchart of a photographing process executed by the first lens control device 209a in the first control mode. First, in step S400, the first lens control device 209a receives an aperture drive time prediction command from the body control device 109 (corresponding to step S330 in FIG. 7). Then, in step S410, the parameters (aperture drive amount a and aperture drive speed v) included in the received aperture drive time prediction command and the lens data stored in the lens side ROM 210 (the above-mentioned calculation formula (1) and correction). Based on the item α), the drive time of the aperture 206 is predicted (the predicted drive time is calculated). In step S420, the predicted drive 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 an aperture 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 by 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 an optical system including an aperture 206 which is a driven member, an aperture drive unit 208 for driving the aperture 206, and lens data related to driving the aperture 206 by the aperture drive unit 208. It is provided with a lens-side ROM 210. The first lens control device 209a is configured based on the lens data stored in the lens side ROM 210, and is capable of determining whether or not the lens data is correctly stored in the lens side ROM 210. Is transmitted to the camera body 100. Since this is done, the camera body side can determine the correctness of the lens data by using the lens data used in the actual shooting operation (aperture control operation). If it is determined to be "positive" in this judgment, it is assumed that the data stored in the lens-side ROM 210 is highly safe, that is, the lens data stored in the lens-side ROM 210 is correctly stored. Can be handled. As a result, it can be treated that the calculation of the predicted drive time of the aperture 206, which is performed in the subsequent shooting operation, is also performed correctly.

(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 or not 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 or not 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 determine the correctness of the lens data related to the aperture drive control before performing the actual shooting operation (aperture control operation), so that it is possible to prevent a shooting failure based on incorrect lens side data. ..

(3) The first lens control device 209a predicts the drive time required for the diaphragm drive unit 208 to drive the diaphragm 206 at a predetermined speed by a predetermined amount based on the lens data stored in the ROM 210. .. Since this is done, it is possible for the camera body 100 side to have a temporal linkage between the aperture drive on the interchangeable lens 200 side and the shutter drive on the camera body side, and it is possible to shorten the release time lag. You can.

(4) The first lens control device 209a transmits the lens data stored in the lens side ROM 210 to the camera body 100 as the lens side determination data. Further, the body control device 109 receives the lens data stored in the lens side ROM 210 as the lens side determination data from the first interchangeable lens 200a. Since this is done, the correctness is judged by using the lens side data (lens data) itself used for the actual shooting operation (aperture control operation). If it is judged to be "positive" by this judgment, it can be treated as if the lens data is correctly stored, and it is treated as if the calculation of the predicted drive time of the aperture 206 performed in the subsequent shooting operation is also performed correctly. Can be done.

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

In the camera system according to the second embodiment, the simple predicted drive time T'with respect to the predicted drive time T of the aperture 206 described above is a "simple method" (for example, a simple calculation) as compared with the first embodiment described above. ) Is provided separately from the prediction method for the prediction drive time T, and the aperture prediction drive time (simple calculation value) obtained by the simple method is determined on the lens side. And.

Here, the above "simple method" will be described. In the first embodiment, the calculation formula (1) "T = a / v + α" (aperture drive amount a, aperture drive speed v, predicted drive time T, correction term α) and the correction term are applied to the lens side ROM 210 as lens data. α is stored, and the predicted drive time T is calculated using this calculation formula (1). On the other hand, in the lens-side ROM 210 according to the second embodiment, in addition to the combination of the above calculation formula (1) and the correction term α, a simple calculation excluding the correction term α from this calculation formula (1). Equation (2) "T'= a / v" is also stored. The "simple method" in the second embodiment is to calculate (generate) the "simple predicted drive time T'" using this simple calculation formula (2). As is clear from the calculation formula (2), the "simple predicted drive time T'" is a time calculated only by the diaphragm drive amount a and the diaphragm drive speed v.
The body control device 109 includes desired parameters (desired aperture drive amount (number of stages) a, desired aperture drive speed v) instead of the determination data request command described in the first embodiment, and is "simple. A "simplified diaphragm drive time prediction command" that requests the interchangeable lens 200a for a "predicted drive time T'" is transmitted to the first lens control device 209a.

On the other hand, the body control device 109 stores in advance the simple calculation formula "T'= a / v" having the same contents as the above simple calculation formula (2) as the body side data in the body side ROM 112. That is, the simple calculation formula "T'= a / v" is a calculation formula commonly stored in the body side ROM 112 and the lens side ROM 210 (in the following description, the above simple calculation formula (2) is "common calculation". It is also called "expression".)

After transmitting the "simplified aperture drive time prediction command" to the first lens control device 209a, the body control device 109 replaces the common arithmetic expression (body side data) stored in the body side ROM 112. The aperture drive time is independently predicted based on the desired parameters (aperture drive amount a, aperture drive speed v) transmitted to the lens 200a.

Specifically, the above desired parameters (aperture drive amount a and aperture drive speed v) are applied to the common calculation formula included in the body side data to calculate a simple predicted 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 is stored in the lens side ROM 210. (It is considered that not only the calculation formula (2) but also the calculation formula (1) and the correction term α) are correctly stored.

FIG. 9 is a flowchart of the initialization process executed by the body control device 109 according to the second embodiment. Since steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, the description thereof will be 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, the body control device 109 transmits a simplified diaphragm drive time prediction command including desired parameters (aperture drive amount a, diaphragm drive speed v) 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 aperture drive amount a and a predetermined aperture drive speed v), or a random value that differs each time the initialization process is executed. (Aperture drive amount a and aperture drive speed v may be a combination of random values, or only one of them may be a combination of random values). In the following step S510, a simple predicted drive time T'is received from the first lens control device 209a.

In step S520, the body control device 109 includes the body side data (common calculation formula) stored in the body side ROM 112 and the parameters (aperture drive amount a, aperture drive speed v) of the aperture drive time prediction command transmitted in step S500. Based on, the drive time of the aperture 206 is easily predicted. Then, in step S530, it is determined whether or not 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 drive time T'calculated on the body side and the simple predicted drive time T'calculated on the lens side in step S530 do not match, the process proceeds to step S162. In this case, the body control device 109 includes the above-mentioned lens data (not only the calculation formula (2) but also the calculation formula (1) and the correction term α) stored in the lens-side ROM 210 in the first interchangeable lens 200a. However, it is considered that the camera body 100 has been damaged by a strong electric shock such as static electricity, and a fourth control mode in which the drive of the aperture 206 is restricted is set in the camera body 100.

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

In step S600, the first lens control device 209a receives the "simplified diaphragm drive time prediction command" from the body control device 109 (corresponding to step S500 in FIG. 9). In step S610, as in step S410 of FIG. 8, the parameters (aperture drive amount a, aperture drive speed v) included in the received simplified aperture drive time prediction command and the lens data stored in the lens side ROM 210 ( The drive time of the aperture 206 is simply predicted (the simple predicted drive time T'is calculated) based on the common calculation formula). 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 according to the second embodiment described above, the following effects can be obtained. (1) The first lens control device 209a transmits a simple predicted drive time T'of the aperture 206 to the camera body 100 as lens-side determination data. Further, the body control device 109 determines the drive time required for the first lens control device 209a to drive the aperture 206 by an arbitrary amount (number of stages) at an arbitrary speed, which is simply predicted based on the lens data (common calculation formula). The result T'of the simple calculation is received from the first interchangeable lens 200a as the lens side determination data. The body-side ROM 112 in the camera body 100 stores the same lens data (common calculation formula) as a part of the lens data (common calculation formula) stored in the lens-side ROM 210 in the first interchangeable lens 200a. The lens. The body control device 109 simply predicts the drive time required to drive the aperture 206 by an arbitrary amount (number of stages) at an arbitrary speed based on the lens data (common calculation formula) stored in the body side ROM 112. By comparing the simple predicted drive time T'with the lens side determination data (simple predicted drive time T'calculated on the lens side) received from the first interchangeable lens 200a, it is stored in the lens side ROM 210. The lens-side determination data can be treated as having high safety (it can be treated as if the lens-side determination data stored in the lens-side ROM 210 is correctly stored), and eventually the lens-side ROM. Treat itself as highly safe, that is, all lens data in the lens-side ROM 210 (common arithmetic expression, arithmetic expression (1), and correction term α) is regarded as highly safe (correctly stored). It can be treated as if it were done). 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 that the size of the lens side judgment data can be reduced and the communication load can be reduced. it can. Not only is the lens data stored correctly, but whether or not the simple predicted drive time T'can be correctly calculated using the lens data (calculation formula (2) which is a part of the calculation formula (1)). That is, a partial determination of the calculation formula (1) can also be made.

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

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

For example, the first aperture drive time prediction command (hereinafter, may be referred to as "aperture drive time prediction command A") sets the aperture 206 in two stages (aperture drive amount a =) at a predetermined aperture drive speed in a predetermined direction. It is a command to predict the drive time when driving only (2 steps), and the second aperture drive time prediction command (hereinafter sometimes referred to as "aperture drive time prediction command B") is the first aperture drive. It is assumed that the command predicts the drive time when the diaphragm 206 is driven by four stages (aperture drive amount a = 4 stages) at the same aperture drive speed in the same direction as the time prediction command. In this case, the predicted drive time (v = predetermined speed, a = 2 steps, the above-mentioned calculation formula (1) and correction) transmitted from the first lens control device 209a as a response to the first aperture drive time prediction command. The time calculated using the term α) is the predicted drive time (v = predetermined speed, a = 4 steps, the above-mentioned calculation formula (1) and the above-mentioned calculation formula (1)) transmitted as a response to the second throttle drive time prediction command. It should be less than the time calculated using the correction term α). This is because the aperture drive amount (2 steps) in the aperture drive time prediction command A is smaller than the aperture drive amount (4 steps) in the aperture drive time prediction command B. As a matter of course, the body control device 109 predicts the predicted drive time as a response to the aperture drive time prediction command A and the prediction as a response to the aperture drive time prediction command B among the predicted drive times transmitted from the first lens control device 209a. It is expected to be smaller (shorter) than the drive time. Therefore, the body control device 109 can correctly predict the drive time of the aperture 206 by the first lens control device 209a by determining whether or not the first predicted drive time is smaller than the second predicted drive time. That is, it is inspected whether the lens data is correctly stored in the lens side ROM 210. In the third embodiment, when the first predicted drive time is smaller than the second predicted drive time, the first lens control device 209a can correctly predict the drive time of the aperture 206. presume.

FIG. 11 is a flowchart of the lens initialization process executed by the body control device 109 according to the third embodiment. Since steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, the description thereof will be 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 an aperture drive time prediction command (hereinafter, referred to as aperture drive time prediction command A) including a predetermined parameter to the first lens control device 209a. The parameter set here may be a fixed value or a random value that differs each time the initialization process is executed. In the subsequent step S710, the predicted drive time (hereinafter referred to as the predicted drive time A) is received from the first lens control device 209a.

In step S720, the body control device 109 transmits an aperture drive time prediction command (hereinafter, referred to as aperture drive time prediction command B) including parameters different from those transmitted in step S700. The parameters included in the aperture drive time prediction command B are set so that the prediction result of the drive time is surely larger than the parameters of the aperture 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 aperture drive time prediction command B. Alternatively, the drive amount and the drive direction are made the same, and the drive speed is set to be smaller for the drive time prediction command B. In the subsequent step S730, the predicted drive time (hereinafter referred to as the predicted drive 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 drive time A received in step S710 is smaller than the predicted drive time B received in step S730. If the predicted drive time A is smaller than the predicted drive 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 drive time A is equal to or longer than the predicted drive 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 200a has been damaged by a strong electrical impact such as static electricity, and the aperture 206 A fourth control mode in which the drive of the lens is restricted is set in the camera body 100.

FIG. 12 is a flowchart of the lens initialization process executed by the first lens control device 209a according to the third embodiment. Since steps S200 and S210 are the same as the initialization process (FIG. 6) in the first embodiment, the description thereof will be omitted.

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

The above-mentioned calculation formula (2) is stored as the lens data stored in the lens-side ROM 210, and the driving time of the aperture 206 is predicted by using this calculation formula (2) in step S810 (prediction). The drive time A may be calculated).

In steps S830 to S850, the "aperture drive time prediction command B" is received from the body control device 109 (corresponding to step S720 in FIG. 11) as in steps S800 to S820, and the prediction drive is performed in the same manner as in 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 according to the third embodiment described above, the following effects can be obtained. (1) The body control device 109 transmits two aperture drive time prediction commands including different parameters to the first lens control device 209a, and the first lens control device 209a transmits as a response to these two commands. By comparing the two predicted drive times, it is determined whether or not the lens data is correctly stored in the ROM 210 (safety of the lens data). Since this is done, the safety of the lens data can be determined without having to store the body-side data used for determining the safety of the lens data in advance in the body-side ROM 112 in the camera body 100. Can be done.

(Fourth Embodiment)
The camera system according to the fourth embodiment of the present invention has the same configuration as 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 of the first and second embodiments are designated by the same reference numerals as those of the first and second embodiments, and the description thereof will be omitted.

In the camera system according to the fourth embodiment, the predicted drive time T of the aperture 206 described above is calculated using the calculation formula (1) described in the first embodiment described above, and the calculated aperture prediction is performed. The drive time is used as the lens side judgment data.

The body-side ROM 112 in the fourth embodiment stores the above calculation formula (1) in advance, but does not store the data (numerical data) of the correction term α. This is because the data of the correction term α may have a large data size even with the data for one interchangeable lens, and when trying to store the data of the correction term α of each of the plurality of interchangeable lenses in the body side ROM 112, For example, it may be necessary to increase the memory (ROM, etc.). Therefore, in the fourth embodiment, the data of the correction term α is not stored in the body side ROM 112 in advance, and each time as necessary (issue a data request command of the correction term α 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 an aperture drive time prediction command including desired parameters (aperture drive amount a, aperture drive speed v) to the lens control device 209a, the data request command of the correction term α To send.

When the lens control device 209 receives the aperture drive time prediction command, the lens control device 209 calculates the predicted drive time T by using the calculation formula (1) stored in the lens side ROM 210 and the data of the correction term α. When the lens control device 209 receives the data request command of the correction term α, the lens control device 209 also extracts the data of the correction term α suitable for the desired parameter from 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 drive time T and the extracted data (numerical data) of the 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 correction term α data and the above-mentioned calculation formula (1) (body side data) stored in the body side ROM 112 Based on the desired parameters (aperture drive amount a, aperture drive speed v) transmitted to the interchangeable lens 200a, the aperture drive time is independently predicted (calculated). Then, the predicted drive time T received from the first lens control device 209a is compared with the predicted drive time T calculated by itself, and if the values match, the lens data (calculation formula (1)) is stored in the lens side ROM 210. And the correction term α) is considered to be correctly stored.

FIG. 13 is a flowchart of the initialization process executed by the body control device 109 according to the fourth embodiment. Since steps S100 to S130 are the same as the lens initialization process (FIG. 5) in the first embodiment, the description thereof will be 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, the body control device 109 transmits a drive time prediction command including desired parameters (aperture drive amount a, aperture drive speed v) 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 aperture drive amount a and a predetermined aperture drive speed v), or a random value that differs each time the initialization process is executed. It may be a value (a combination of values in which both the aperture drive amount a and the aperture drive speed v are random values, or a combination in which only one of them is a random value).

Further, in this step S900, the body control device 109 transmits a command for requesting the data of the correction term α described above to the first lens control device 209a. By this request command, the body control device 109 requests the lens control device 209 for data of the correction term α suitable for the combination of the predetermined aperture drive amount a and the predetermined aperture drive speed v.

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

In step S920, the body control device 109 uses the body side data (calculation formula (1)) stored in the body side ROM 112 and the parameters of the aperture drive time prediction command (aperture drive amount a, aperture drive speed v) transmitted in step S900. ) And the numerical data of the correction term α acquired from the lens side in step S910, the drive time of the aperture 206 is simply predicted and calculated. Then, in step S930, it is determined whether or not the predicted drive time T received in step S910 and the predicted drive time T calculated in step S920 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 predicted drive time T calculated on the body side and the predicted drive time T calculated on the lens side in step S930 do not match, the process proceeds to step S162. In this case, in the body control device 109, the above-mentioned lens data (at least one of the calculation formula (1) and the data of the correction term α) stored in the lens-side ROM 210 in the first interchangeable lens 200a is, for example, electrostatic. The camera body 100 is set to a fourth control mode in which the drive of the aperture 206 is restricted, assuming that the camera body has been damaged by the strong electrical impact of the lens.

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

In step S1000, the first lens control device 209a receives the “aperture drive time prediction command” and the “data request command of the 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 (aperture drive amount a, aperture drive speed v) included in the received aperture drive time prediction command and the lens data (calculation formula) stored in the lens side ROM 210. Based on (1) and the numerical data of the correction term α), the drive time of the aperture 206 is predicted and calculated (the predicted drive time T is calculated). In step S1020, the predicted drive 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 according to the fourth embodiment described above, the following effects can be obtained. (1) Since the safety of the data stored in the lens-side ROM 210 can be determined even if the body-side ROM 112 does not have the data of the correction items 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 example 1)
In each of the above embodiments, an example in which the present invention is applied to the lens data relating to the driving of the diaphragm 206 which can be moved so as to change the size of the aperture through which the light flux passes has been described, but the present invention describes other driven members. It is also possible to apply to. For example, the present invention may be applied to lens data relating to the driving of a focusing lens 204 that can move in the direction of the optical axis X of the optical system. That is, the first interchangeable lens 200a may be configured so that the driving time of the focusing lens 204 can be predicted, and the lens side ROM 210 may store lens data related to the driving of the focusing lens 204. Further, a shake correction lens (a lens that can be moved so as 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 added to this shake correction lens. It is also possible to apply.

(Modification 2)
In the first embodiment, instead of transmitting all the lens data as the lens side determination data to the camera body 100, only a part of the lens data may be generated as the 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 aperture 206 and a correction term thereof, only the arithmetic expression may be generated and transmitted as lens-side determination data. In this case, only the calculation formula needs to 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-mentioned calculation formula of the predicted drive time and the correction term. For example, it may be a parameter other than the correction term given to the calculation formula of the predicted drive time, and the data (for example, the data "1LSB") representing the unit of the drive control of the aperture 206 (the drive unit of the aperture drive unit 208) may be used. It may be the number of aperture drive stages represented). Further, it may be data indicating whether or not the lens data is stored in the lens side ROM 210.

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

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

(Modification 5)
In the second embodiment, when comparing two predicted drive times, the two values do not necessarily have to exactly match. For example, depending on the accuracy of floating-point arithmetic, an error may occur between the two predicted drive times. Therefore, it may be determined that the difference between the two predicted drive times is equal to or less than a predetermined threshold value. ..

(Modification 6)
In the second embodiment, the lens control device 209a simply calculates the aperture drive time using a common calculation formula, but instead of using such a calculation formula, a table (for example, aperture drive amount a and aperture drive speed v) is used. A simple aperture drive prediction time T'may be obtained by using (a two-dimensional table with) as a parameter. In this case, the body control device 109 is also configured to have a table having the same contents as this calculation table.

(Modification 7)
In each of the above-described embodiments, when the fourth control mode is set (when it is determined that the lens data is not correctly stored), the aperture drive command is not transmitted to the first lens control device 209a and the aperture is stopped down. Although the photographing operation or the like was performed with the aperture diameter of 206 fixed, an operation different from each of these embodiments may be adopted as an operation when the lens data is not correctly stored. For example, the drive speed of the aperture 206 may not be specified, but the aperture drive may be performed (a diaphragm drive command that does not include a drive speed parameter is transmitted) (that is, the "second control mode" in the above-described embodiment. You may set it to), stop the power supply to the interchangeable lens, or prohibit shooting with the interchangeable lens.

(Modification 8)
In the second embodiment, the simplified aperture drive time prediction command transmitted by the body control device 109 at the time of determination may be the same as the aperture drive time prediction command used at the time of shooting. That is, the calculation formula (1) stored in the lens side ROM 210 of the interchangeable lens 200 mounted on the body side mount portion, the calculation formula (1) which is the same as the correction term α, and the correction term α are preliminarily applied to the body side. If it is stored in the ROM 112, the same determination as in the second embodiment can be performed without using a separate simple common calculation formula (even if it is not stored in each other's ROM).

(Modification 9)
In each of the above embodiments, the lens control device 209a calculates the aperture drive time T using the calculation formula (1) and the correction term α, but it is not such a calculation formula but a table (for example, diaphragm drive). A two-dimensional table in which the quantity a and the aperture drive speed v are parameters, and the numerical value in the table is preliminarily added with the correction term α) to obtain the aperture drive prediction time T. Is also good.

(Modification example 10)
In the third embodiment, when the predicted drive time as a response to the aperture drive time prediction command A is smaller (shorter) than the predicted drive time as a response to the aperture drive time prediction command B, the first lens control is performed. The device 209a is configured to determine that the drive time of the aperture 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 aperture drive amount in the aperture drive time prediction command A to be larger than the aperture drive amount in the aperture drive time prediction command B, and the first predicted drive time is the second. It is determined whether or not it is larger than the predicted drive time (when it is larger, the first lens control device 209a can correctly predict the drive time of the aperture 206, that is, the lens data is correctly stored in the lens side ROM 210. , It may be determined).

(Modification 11)
In the third embodiment and the modified example 10, the first lens control device 209a obtains the predicted drive time according to the aperture drive time prediction commands A and B from the body control device 109, respectively, and obtains the predicted drive time. It is configured to transmit the predicted drive time 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 and determine the magnitude. However, the body control device 109 does not have to receive the two predicted drive times and perform the comparison operation, but has a magnitude relationship between the two predicted drive times (time A and B) (in the third embodiment, "time A". It suffices to know <time B ”, or“ time A> time B ”in the modified example 10. Therefore, after the lens control device 209a calculates the two predicted drive times, the lens control device 209a compares the magnitude relationship between the two predicted drive times, and the information indicating the comparison result (the magnitude of the calculated two predicted drive times). Information indicating the relationship, for example, information indicating "time A <time B" in the third embodiment and information indicating "time A> time B" in the modified example 10) 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 independently makes a simple prediction of the aperture drive time by using the above-mentioned "common calculation formula". However, instead of performing the simple prediction (calculation) using the above-mentioned "common calculation formula", the body control device 109 uses the table information (described later) (body-side data) stored in the body-side ROM 112 in advance to describe the above. The "simple predicted drive time T'" may be obtained. Specifically, a desired parameter (a combination of a desired aperture drive amount a and a desired aperture drive speed v) and a "simple predicted drive time T'" corresponding to each combination are displayed on the body side ROM 112. Store the configured table information (body side data). Then, the body control device 109 selects "simple predicted drive time T'" to be used as a comparison target from the table information according to desired parameters (aperture drive amount a and aperture drive speed v) sent as commands to the lens side. To do. Then, the body control device 109 compares the "simple predicted drive time T'" transmitted from the lens control device 209a with the "simple predicted drive time T'" selected from the above table information. Subsequent processing is the same as that of the second embodiment. In this way, the body control device 109 can compare the "simple predicted drive times T'" with each other without performing the calculation using the common calculation formula.

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

FIG. 15 is a diagram showing an example of table information stored in the body-side ROM 112. The body-side ROM 112 stores the table information 10 instead of the above-mentioned "simple calculation formula (2)" T'= a / v "". The table information 10 includes a plurality of sets (five in FIG. 16) in which a simple predicted drive time T'is associated with a parameter including the diaphragm drive amount a and the diaphragm 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 above-mentioned "simple arithmetic expression (2)" stored in advance in a computer or the like installed in a factory that manufactures the camera system. It is a value calculated in advance by substituting the diaphragm drive amounts a1 to a5 and the diaphragm drive speeds v1 to v5 shown in FIG. 15, respectively. This table information is stored in the body side ROM 112 at the time of shipment from the factory.

FIG. 16 is a flowchart of the initialization process executed by the body-side control device 109 according to the modified example 12. Since the operations of steps S100 to S131 are the same as the flowchart shown in FIG. 9, the description thereof will be omitted.

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 one of the parameter sets from the table information 10 stored in the body side ROM 112.

In the following step S1100, the body control device 109 transmits a simplified diaphragm drive time prediction command to the first lens control device 209a. This command includes the aperture drive amount and aperture 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 aperture drive amount a1 and the aperture drive speed v1.

In the next step S510, the body control device 109 receives from the first lens control device 209a a simple predicted drive time T'calculated by the first lens control device 209a. The predicted drive time T'is calculated by the first lens control device 209a by giving the aperture drive amount and the aperture drive speed included in the command transmitted in step S1100 to the simple calculation formula (2) described above. It is the value that was set. For example, when the first set is selected in step S1090, the first lens control device 209a calculates a simple predicted drive time T'using the aperture drive amount a1 and the aperture drive speed v1.

Then, in step S1120, the body control device 109 acquires a simple predicted drive time T'included in the parameter set selected in step S1090 from the table information 10. For example, when the first set is selected in step S1090, the simple predicted drive time T1'included in the first set is acquired in step S1120. After that, in step S1130, the body control device 109 determines whether or not the simple predicted drive time T'received in step S510 and the simple predicted drive time T'(for example, T1') acquired in step S1120 match. To judge. 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-mentioned first control mode. On the other hand, if the two values do not match in step S1130, the process proceeds to step S162, and the above-mentioned fourth control mode is set in the camera body 100.

In this modification 12, the operation of the first lens control device 209a is the same as the flowchart shown in FIG. 10, so the description thereof will be omitted.

By the way, in the modification 12, the simple predicted drive time T1'to T5' in the table information 10 is calculated in advance, and the simple predicted drive time T'received from the interchangeable lens side in step S510 of FIG. The simple calculation formula (2) "T'= a / v" is used as the calculation formula used when the is calculated on the interchangeable lens side. However, instead of this simple calculation formula (2), the above-mentioned calculation formula (1) "T = a / v + α (T = α + a / v)" may be used.

Further, in the above-described modification 12, an example in which the table information 10 includes five parameter sets of the first to fifth sets has been described, but 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 can be sequentially transmitted to the interchangeable lens side, and a simple predicted drive time T'check can be performed for each of them. It is possible, and the effect of confirming the safety of the lens data stored in the lens-side ROM 210 can be enhanced. Therefore, it is preferable that the table information 10 includes a plurality of parameter sets.

(Modification 13)
In each of the above-described embodiments and modifications, it is determined whether the body control device sets the above-mentioned first control mode or the above-mentioned fourth control mode in the control of the camera body side. (For example, step S160 in FIG. 5, step S530 in FIG. 9, step S1130 in FIG. 15 and the like) are performed only once. The camera body may be configured to perform this determination a plurality of times. Alternatively, this determination is performed once, the first or fourth control mode is set, and then again at a predetermined timing (for example, when a re-judgment is requested or when a predetermined time has elapsed from the previous determination). This determination may be made. Further, this determination may be repeatedly performed at predetermined intervals.

When performing this re-judgment, 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 also compares it with the lens-side judgment data. It will work to prepare the data for again. Taking an example in FIG. 15, the operation from step S109 to step S1130 is repeated again.

The present invention is not limited to the above-described 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 within the scope of the present invention. ..

100 ... Camera body, 101 ... Body side mount, 102, 202 ... Multiple electrical contacts, 103 ... Quick return mirror, 104 ... Imaging element, 105 ... Sub mirror, 106 ... Focus detector, 107 ... Finder screen, 108 ... Penta Prism, 109 ... Body control device, 110 ... Eyepiece lens, 111 ... In-body aperture drive unit, 112, 210 ... ROM, 120 ... Release switch, 200a ... First interchangeable lens, 200b ... Second interchangeable lens, 200c ... Third interchangeable lens, 201 ... lens side mount unit, 204 ... focusing lens, 206 ... aperture, 207 ... lens drive unit, 208 ... aperture drive unit, 209a ... first lens control device, 209b ... second lens control Device, 209c ... Third lens control device

Claims (5)

An interchangeable lens that communicates with the camera body
Driven part and
The drive unit that drives the driven unit and
A receiving unit that receives first information including a desired driving speed and a desired driving amount regarding the driving of the driven unit from the camera body.
A transmission unit that transmits the second information regarding the drive time of the driven unit obtained based on the first information to the camera body, and a transmission unit.
It has a drive unit and a control unit that controls the transmission unit.
The receiving unit is an interchangeable lens that receives the first information before receiving the third information instructing the driving of the driven unit from the camera body. In the interchangeable lens according to claim 1,
The third information is an interchangeable lens including at least one or more of information on a driving amount, a driving direction, and a driving speed of the driven portion. In the interchangeable lens according to claim 1 or 2.
The driving unit is an interchangeable lens that drives the driven unit based on the third information received by the receiving unit. In the interchangeable lens according to any one of claims 1 to 3.
The receiving unit is an interchangeable lens that receives the first information in the initial communication that communicates information with the camera body regarding the type of the interchangeable lens. In the interchangeable lens according to any one of claims 1 to 4.
It has an optical system including the driven portion, and has an optical system.
The driven portion changes the size of a member that can move in the optical axis direction of the optical system, a member that can move so as to include a component in a direction perpendicular to the optical axis direction, or an opening through which a light flux passes. An interchangeable lens that includes any of the movable members.

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