JP6750224B2 - Interchangeable lens and camera - Google Patents

Description

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

There is known an imaging device that drives a focusing lens according to the operation amount of a focus ring (Patent Document 1). However, the technique of Patent Document 1 has a problem that it is not possible to easily change the driving of the focusing lens according to the operation amount of the focus ring.

JP, 2004-48160, A

According to the first aspect of the present invention, the interchangeable lens includes a detection unit that detects an operation performed on an operation unit operated by a photographer and outputs a detection signal, a reception unit that receives a control signal from the camera body, and the detection unit. A control unit that controls the image plane velocity of the optical system by using the detection signal output from the unit and the control signal received by the receiving unit, wherein the control unit is the operation unit. A first mode in which the image surface speed of the optical system is controlled when the operation speed is equal to or higher than a predetermined value, and a second mode in which the image surface speed of the optical system is not controlled even when the operation speed of the operation unit is equal to or higher than the predetermined value. When the operation speed of the operation unit is equal to or higher than the predetermined value, the control unit controls the image plane speed of the optical system in the first mode to The control is performed so as to be higher than the image plane velocity of the optical system in the second mode .
According to the second aspect of the present invention, the interchangeable lens includes a detection unit that detects an operation performed on an operation unit operated by a photographer and outputs a detection signal, a reception unit that receives a control signal from the camera body, and the detection unit. A control unit that controls the image plane velocity of the optical system by using the detection signal output from the unit and the control signal received by the receiving unit, wherein the control unit is the operation unit. A first mode in which the image surface speed of the optical system is controlled when the operation speed is equal to or higher than a predetermined value, and a second mode in which the image surface speed of the optical system is not controlled even when the operation speed of the operation unit is equal to or higher than the predetermined value. In the second mode, the control unit controls to drive the optical system by a drive amount proportional to the operation amount of the operation unit.
According to the third aspect of the present invention, the interchangeable lens includes a detection unit that detects an operation performed on the operation unit operated by a photographer and outputs a detection signal, a reception unit that receives a control signal from the camera body, and the detection unit. A control unit that controls the image plane velocity of the optical system by using the detection signal output from the unit and the control signal received by the receiving unit, wherein the control unit is the operation unit. A first mode in which the image surface speed of the optical system is controlled when the operation speed is equal to or higher than a predetermined value, and a second mode in which the image surface speed of the optical system is not controlled even when the operation speed of the operation unit is equal to or higher than the predetermined value. The control unit controls the image of the optical system when the operating speed of the operating unit is slower than the predetermined value in the first mode and the second mode. The surface speed is not controlled, and the optical system is controlled to be driven by a drive amount proportional to the operation amount of the operation unit.
According to a fourth aspect of the present invention, the camera has an interchangeable lens according to any one of the first to third aspects .

It is a perspective view which shows the camera which concerns on 1st Embodiment. It is a principal part block diagram of the camera which concerns on 1st Embodiment. It is a figure which shows an example of control of the focusing lens in the camera which concerns on 1st Embodiment. It is a figure which shows an example of speed control in the 2nd operation mode in the camera which concerns on 1st Embodiment. It is a figure which shows an example of the cam data which concerns on 1st Embodiment. 6 is a flowchart showing an operation example of the camera of the first embodiment. 6 is a table showing an example of MF ring operation determination threshold values in the camera of the first embodiment. It is a principal part block diagram of the camera which concerns on a modification. It is a figure which shows an example of control of the focusing lens in the camera which concerns on a modification.

(First embodiment)
FIG. 1 is a perspective view showing a digital camera 1 (hereinafter referred to as a camera 1) according to an embodiment. The camera 1 is composed of a camera body 2 and an interchangeable lens 3, and the interchangeable lens 3 is attachable to and detachable from the camera body 2.

The camera body 2 is provided with a body side mount portion 201 to which the interchangeable lens 3 is attached. Further, as shown in FIG. 1, a connection portion 202 is provided on the inner surface side of the body side mount portion 201. The connecting portion 202 is provided with a plurality of electric contacts.

On the other hand, the interchangeable lens 3 is provided with a lens side mount portion 301 attached to the camera body 2. Further, as shown in FIG. 1, a connection portion 302 is provided on the inner surface side of the lens side mount portion 301. The connection portion 302 is provided with a plurality of electric contacts. The operation ring provided on the outer peripheral surface of the lens barrel of the interchangeable lens 3 is a focus ring 135 (hereinafter, also referred to as an MF ring). The focus ring 135 functions as an operation unit operated by the photographer.

When the interchangeable lens 3 is attached to the camera body 2, the electrical contact of the connection portion 202 provided on the body side mount portion 201 and the electrical contact of the connection portion 302 provided on the lens side mount portion 301 are electrically connected. And physically connected. This enables power supply from the camera body 2 to the interchangeable lens 3 and communication between the camera body 2 and the interchangeable lens 3 via the connection unit 202 and the connection unit 302.

<Interchangeable lens>
FIG. 2 is a configuration diagram of a main part of the camera 1 illustrated in FIG. As shown in FIG. 2, the interchangeable lens 3 includes an optical system including a plurality of lenses 31 to 33, a diaphragm 34, a lens control unit 37, a lens memory 38, and a communication unit 39. The interchangeable lens 3 further includes a zoom lens drive motor 321, a focusing lens drive motor 331, an aperture drive motor 341, and the like.

The lens 33 is a focusing lens. The focusing position of the optical system is adjusted by moving the focusing lens 33 back and forth in the optical axis L1 direction. The focusing lens 33 is driven by a focusing lens drive motor 331. The position of the focusing lens is managed by the lens controller 37. For example, the position of the focusing lens 33 may be detected based on a signal to the focusing lens drive motor 331, or the position may be detected by providing an encoder (not shown).

The focusing lens drive motor 331 is composed of, for example, a stepping motor. The lens controller 37 gives a drive instruction to the focusing lens drive motor 331. For example, the body control unit 21 of the camera body 2 determines the moving direction and moving speed of the focusing lens 33, and a control signal indicating the determined moving direction and moving speed is transmitted to the lens control unit 37. The lens controller 37 sends a drive instruction to the focusing lens drive motor 331 based on the control signal from the body controller 21.

The lens 32 is a zoom lens. The focal length of the optical system is changed by moving the zoom lens 32 back and forth in the optical axis L1 direction. The zoom lens 32 is driven by the zoom lens drive motor 321, and the position thereof is detected by the zoom lens encoder 322. A drive instruction to the zoom lens drive motor 321 is given by the lens control unit 37.

The diaphragm 34 is a light flux limiting member. The diaphragm 34 limits the light flux that passes through the optical system and reaches the image sensor 22 by changing the aperture diameter around the optical axis L1. The diaphragm 34 is driven by a diaphragm drive motor 341. The lens controller 37 gives a drive instruction to the diaphragm drive motor 341. The aperture diameter of the diaphragm 34 is detected by the diaphragm aperture sensor 342. The aperture diameter of the diaphragm 34 is managed by the lens controller 37.

The lens controller 37 receives from the body controller 21 a control signal indicating the aperture diameter (aperture value) calculated in the automatic exposure mode, for example. In addition, the lens control unit 37 receives from the body control unit 21 a control signal indicating an aperture diameter (aperture value) set by a manual operation on the operation member 28 (for example, an aperture ring).

Lens information such as an image plane movement coefficient is recorded in the lens memory 38. The image plane movement coefficient is a value indicating the correspondence between the movement amount of the focusing lens 33 and the movement amount of the image plane. The lens memory 38 is composed of a non-volatile storage medium or the like.

The communication unit 39 performs predetermined communication with the communication unit 29 of the camera body 2. As a result, information and instructions on the camera body 2 side are transmitted to the lens controller 37 of the interchangeable lens 3, and information on the interchangeable lens 3 side is transmitted to the body controller 21 of the camera body 2. The communication unit 39 functions as a receiving unit that receives a signal from the camera body 2, and also functions as a transmitting unit that transmits a signal to the camera body 2.

The detection unit 40 has a first photo interrupter and a second photo interrupter. On the inner peripheral surface of the focus ring 135, shield plates are provided at regular intervals in the circumferential direction. The shield plate blocks the light incident on the light receiving elements of the first photo interrupter and the second photo interrupter, thereby causing changes in the detection signals of the first photo interrupter and the second photo interrupter. The detection unit 40 detects the rotation operation of the focus ring 135 and outputs a detection signal (pulse signal) to the lens control unit 37. The lens controller 37 calculates the operation amount (movement amount) and the operation direction (movement direction) of the focus ring 135 based on the detection signal output by the detection unit 40.

<Camera body>
The camera body 2 includes a body control unit 21, an image sensor 22, a shutter 23, a memory 24, a microphone 25, a liquid crystal display 27, an operation member 28, and a communication unit 29.

The body control unit 21 includes a microcomputer (not shown), a memory 21A, and the like, and comprehensively controls the operation of each unit of the camera 1 based on a built-in control program. For example, the body control unit 21 performs predetermined image processing (color interpolation processing, gradation conversion processing, contour enhancement processing, white balance adjustment, etc.) on the data output from the image sensor 22. The body control unit 21 generates a control signal for controlling the drive of the optical system or the diaphragm of the interchangeable lens 3 based on the lens information received from the interchangeable lens 3.

In addition, the body control unit 21 performs a predetermined exposure calculation using the data output from the image sensor 22, and controls the exposure of the camera 1 based on the exposure amount obtained by this exposure calculation. To describe one example of the automatic exposure calculation, the body control unit 21 divides the shooting screen into a plurality of areas, and reads out data corresponding to each of the divided areas from the image sensor 22 as a photometric signal. The body control unit 21 calculates the exposure based on the read photometric signal.
Furthermore, the body control unit 21 performs focus detection processing of the optical system. The focus detection processing will be described later.

The image sensor 22 has a plurality of photoelectric conversion elements arranged two-dimensionally, and captures a still image, a moving image, and a live view image (also referred to as a through image) described later. The live view image is an image for observation that is sequentially acquired by the image sensor 22 at a predetermined frame rate.

The shutter 23 is controlled to be opened and closed by the body control unit 21. The memory 24 is a removable recording medium. The body controller 21 controls writing and reading of image data and audio data in the memory 24. The microphone 25 converts the collected sound into an audio signal. The audio signal is amplified and A/D converted by the body control unit 21, and recorded in the memory 24 as digital audio data.

The liquid crystal display 27 is provided on the back surface of the camera body 2. The liquid crystal display 27 reproduces and displays an image in response to an instruction from the body control unit 21, displays information regarding shooting such as a shutter speed, an aperture value, and the number of shots, and a menu screen for performing various settings for the camera body 2. To display.

The operation member 28 includes a release button, a recording button, various setting switches, and the like. The camera 1 can switch various modes such as a still image shooting mode, a moving image shooting mode, an auto focus (hereinafter referred to as AF) mode, and a manual focus (hereinafter referred to as MF) mode by operating the operation member 28. Has become. The operation member 28 sends an operation signal corresponding to the operation to the body control unit 21. The operation member 28 includes a first switch SW1 that is turned on when the release button is pressed halfway and a second switch SW2 that is turned on when the release button is fully pressed.

In the MF mode, for example, the lens control unit 37 determines the moving direction and the moving speed of the focusing lens 33 according to the rotating operation of the focus ring 135 in FIG. 1, and sends a driving instruction to the focusing lens driving motor 331. In the present embodiment, the camera 1 has a plurality of operation modes for controlling the driving of the focusing lens 33, and the operation modes can be switched.

The camera 1 is configured to be capable of shooting still images and moving images.
<Live view image>
The body control unit 21 sets the live view mode in the shooting standby state, for example. An example of the operation in the live view mode will be described. The body control unit 21 controls the aperture 34 of the interchangeable lens 3 to have an aperture diameter according to the brightness of the subject while the shutter 23 remains open, and the live image is captured by the image sensor 22. The view image is acquired at a predetermined frame rate. The body control unit 21 causes the liquid crystal display 27 to sequentially display the acquired live view images.

<Still image>
For example, when the user fully presses the release button forming the operation member 28, the body control unit 21 starts the still image shooting. Explaining an example of the operation, the shutter 23 is once closed, the diaphragm 34 of the interchangeable lens 3 is controlled to an aperture diameter according to the brightness of the subject, and the shutter 23 is opened to guide the light flux from the subject to the image sensor 22. .. The body control unit 21 closes the shutter 23 when a predetermined shutter time elapses, and performs predetermined image processing on the image data photoelectrically converted by the image sensor 22. The body control unit 21 opens the shutter 23 again to return to the live view mode, and records the image data after the image processing in the memory 24.

<Motion image>
In addition, for example, when the user presses the record button that constitutes the operation member 28, the body control unit 21 switches from the still image shooting mode to the moving image shooting mode and starts moving image shooting. Explaining an example of the operation, the aperture diameter of the diaphragm 34 of the interchangeable lens 3 is controlled to an aperture diameter according to the brightness of the subject, and the image pickup device 22 captures a moving image at a predetermined frame rate. At this time, the voice collected by the microphone 25 described above is also recorded. When the recording button is pressed again while shooting a moving image, the body control unit 21 ends the shooting of the moving image and the recording of the sound. The moving image data and the digital audio data are recorded in the memory 24 by the body control unit 21.

The camera 1 is configured so that the following focus detection can be performed.
<Contrast AF>
The body control unit 21 detects the focus adjustment state (contrast AF) of the optical system by the contrast detection method based on the data read from the image sensor 22. For example, while the control signal is sent from the body control unit 21 to the lens control unit 37 to move the focusing lens 33 at a predetermined sampling interval (distance), the data acquired by the image sensor 22 at each position of the focusing lens 33 is acquired. Is read from the image sensor 22. The body control unit 21 performs focus evaluation value calculation based on the read data. Then, the position of the focusing lens 33 having the maximum focus evaluation value is obtained as the in-focus position.

Generally, in the contrast AF, if the moving speed of the focusing lens 33 exceeds a predetermined speed and the sampling interval of the focus evaluation value becomes too long, the focusing accuracy may decrease. Therefore, in the search control for moving the focusing lens 33 in order to detect the focus evaluation value, the body control unit 21 obtains the image plane driving speed corresponding to the sampling interval that can appropriately detect the in-focus position. Then, the moving speed of the focusing lens 33 is determined, and the focusing lens 33 is moved. The search control includes, for example, wobbling, a proximity search (a proximity scan) that searches only the vicinity of a predetermined position, and a whole area search (a whole area scan) that searches the entire movable range of the focusing lens 33. For example, the body control unit 21 drives the focusing lens 33 at a low speed in the search control in the moving image shooting mode, and drives the focusing lens 33 at a high speed in the search control in the still image shooting mode.

<Phase difference AF>
Further, the body control unit 21 can also perform focus detection (phase difference AF) by a phase difference detection method. The phase difference detection method is a method of detecting the defocus amount based on the phase difference between the images formed by the pair of focus detection light beams that are incident via the pupil regions of different optical systems. In this method, the body control unit 21 focuses on the basis of the relative positional deviation amount (relative interval) of a pair of images captured by the focus detection pixel columns provided at different positions of the phase difference detection sensor. The moving direction and the moving amount of the focusing lens 33 necessary for the calculation are calculated. The body control unit 21 performs the phase difference AF when the focus state is largely deviated from the in-focus state, for example.

Specifically, the body control unit 21 calculates the image shift amount of the pair of images by performing image shift detection calculation processing (correlation calculation processing, phase difference detection processing) on the intensity distribution of the pair of images. To do. The body control unit 21 further calculates the defocus amount indicating the focus adjustment state of the interchangeable lens 3 by multiplying the image shift amount by a predetermined conversion coefficient. Since such defocus amount calculation in the phase difference AF is known, detailed description of the phase difference AF is omitted.

The phase-difference detecting sensor may use a focus detection pixel row that is included in the image sensor 22 in advance, or a dedicated sensor including the focus detection pixel row may be provided separately from the image sensor 22. You may comprise.

<Decision of control of focusing lens>
In the MF mode, the lens control unit 37 controls the focusing lens 33 based on the detection signal output from the detection unit 40 and the control signal output from the body control unit 21. The lens control unit 37 sets the operation mode of the focusing lens 33 according to the control signal output from the body control unit 21, and controls the focusing lens 33.

FIG. 3 is a diagram showing an example of control of the focusing lens 33 in the camera 1 according to the first embodiment. In FIG. 3, the horizontal axis represents the rotation speed of the focus ring 135 (the unit is, for example, deg/s), and the vertical axis is the image plane speed (the unit is, for example, mm/s). The image plane velocity is the moving velocity of the image plane when the focusing lens 33 is moved. As shown in FIG. 3, the lens controller 37 has, for example, three operation modes. In the MF mode, the lens controller 37 sets one of the three operation modes based on the control signal from the body controller 21.

In the first operation mode, the lens control unit 37 switches between position control and speed control of the focusing lens 33 based on the rotation speed of the focus ring 135. The position control is control based on the operation amount of the focus ring 135, and the speed control is control based on the rotation speed of the focus ring 135.

In the first operation mode, when the rotation speed of the focus ring 135 is lower than the threshold value Pt, the focusing lens 33 is driven by the drive amount proportional to the operation amount of the focus ring 135. The lens control unit 37 calculates the drive amount of the focusing lens 33 per pulse of the focusing lens drive motor 331 based on the image plane movement coefficient, the target spatial frequency, and the effective F value, for example. The lens control unit 37 performs position control in which the driving amount of the focusing lens 33 is determined by the number of pulses detected by the detection unit 40. In the position control, the lens control unit 37 performs control such that the driving amount of the focusing lens 33 increases as the depth of focus increases. As described above, when the rotation speed of the focus ring 135 is smaller than the threshold value Pt, the position control for controlling the driving of the focusing lens 33 is performed based on the effective F value, the depth of focus, and the like, so that the photographer performs fine focusing. It can be performed.

In the first operation mode, when the rotation speed of the focus ring 135 is higher than the threshold value Pt, the lens control unit 37 performs speed control in which the image plane speed increases as the rotation speed of the focus ring 135 increases. In the speed control, the driving speed of the focusing lens 33 is represented by, for example, a quadratic function or an exponential function whose variable is the operation amount of the focus ring 135.

The lens control unit 37 drives the focusing lens 33 at the drive speed calculated by the following equation (1) during speed control, for example.
v=ax ² +bx+c (1)
Here, v is the driving speed of the focusing lens 33, x is the operation amount of the focus ring 135, and a, b, and c are predetermined constants. The lens controller 37 generates a control signal for driving the focusing lens 33 according to the above-described function, and outputs the control signal to the focusing lens drive motor 331. Further, the lens control unit 37 adjusts the constant c at the threshold value Pt so that the switching operation between the position control and the speed control becomes smooth. As described above, when the rotation speed of the focus ring 135 is higher than the threshold value Pt, speed control is performed in which the image plane speed is accelerated as the rotation of the focus ring 135 is rotated faster. As a result, the photographer can quickly move the focusing lens 33 with a small amount of operation, and can perform quick focusing. The first operation mode is used, for example, when shooting a still image.

In the second operation mode, similarly to the first operation mode, the lens control unit 37 switches the position control and the speed control of the focusing lens 33 based on the rotation speed of the focus ring 135. The lens control unit 37 performs position control when the rotation speed of the focus ring 135 is lower than the threshold Pt, and performs speed control when the rotation speed of the focus ring 135 is higher than the threshold Pt.

In the speed control in the second operation mode, the focusing lens 33 is extended such that the operation amount (rotation angle) of the focus ring 135 and the reciprocal of the distance between the camera 1 and the subject (subject distance) are proportional. The second operation mode is used, for example, when shooting a moving image.

FIG. 4 is a diagram showing an example of speed control in the second operation mode in the camera 1 according to the first embodiment. FIG. 4A is a diagram showing the relationship between the rotation angle of the focus ring 135 and the reciprocal of the subject distance R when the focus ring 135 is operated at a predetermined rotation speed (reference rotation speed). As shown in FIG. 4A, in the speed control in the second operation mode, the rotation angle of the focus ring 135 and the reciprocal of the subject distance R have a proportional relationship. FIG. 4B is a diagram showing an example of the relationship between the driving speed of the focusing lens 33 and the reciprocal of the subject distance R. In FIG. 4B, the rotation speed of the focus ring 135 is the reference rotation speed. When the rotation angle of the focus ring 135 and the reciprocal of the subject distance R have a proportional relationship, the driving speed of the focusing lens 33 and the reciprocal of the subject distance R have a relationship as shown in FIG. 4B, for example.

FIG. 4C is a diagram showing an example of the relationship between the rotation speed of the focus ring 135 and the driving speed of the focusing lens 33. As shown in FIG. 4C, the lens control unit 37 performs speed control when the rotation speed of the focus ring 135 is higher than the threshold value Pt. The drive speed of the focusing lens 33 during speed control is represented by, for example, a linear function having the operation amount of the focus ring 135 as a variable. The lens controller 37 drives the focusing lens 33 at a drive speed calculated by the following equation (2), for example.
v=bx+c (2)
The lens control unit 37 calculates the constant b using, for example, the reference rotation speed of the focus ring 135 and the drive speed of the focusing lens 33 when the focus ring 135 shown in FIG. 4B is operated at the reference rotation speed. To do.

The driving speed of the focusing lens 33 shown in FIG. 4B has, for example, a cam shape (cam locus) of a cam virtually designed such that the rotation angle of the focus ring 135 and the reciprocal of the object distance R are proportional. It is calculated based on The cam data indicating the designed cam shape (cam locus) is stored in the lens memory 38 as electronic data.

FIG. 5 is a diagram showing an example of the cam data according to the first embodiment. FIG. 5A shows a virtual cam shape (hereinafter, also referred to as a virtual cam pattern) that changes according to the position of the zoom lens 32 and the position of the focusing lens 33, and FIG. 5B shows the position of the focusing lens 33. The virtual cam shape which changes according to it is shown. In FIGS. 5A and 5B, the horizontal axis represents the rotation angle of the cam (the unit is, for example, deg). The driving speed of the focusing lens 33 is calculated using the cam data of the combined cam of the cam shown in FIG. 5A and the cam shown in FIG. 5B. At the position Z of the zoom lens 32 and the position K of the focusing lens 33, the driving speed of the focusing lens 33 when the cam is driven at 1 deg/s is FC(Z′+K′)×FHC(K′). Here, FC(Z′+K′) is a differential value (slope) of the virtual cam pattern shown in FIG. 5A, and FHC(K′) is a differential value of the virtual cam pattern shown in FIG. 5B. is there. The unit of the driving speed of the focusing lens 33 is, for example, mm/deg. As described above, in the speed control in the second operation mode, the drive speed is obtained by multiplying the differential value of the virtual cam pattern so that the rotation angle of the focus ring 135 and the reciprocal of the object distance R are proportional. The calculated driving speed is reflected in the tilt parameter of the equation (2).

In the third operation mode, the lens control unit 37 always performs position control without performing speed control. The third operation mode is used, for example, when performing enlarged display in the live view mode. The photographer can perform fine focusing while enlarging the image.

<Explanation of flow chart>
FIG. 6 is a flowchart showing an operation example of the interchangeable lens 3 and the camera body 2 according to the first embodiment. FIG. 6A is a flowchart showing an example of processing in the interchangeable lens 3, and FIG. 6B is a flowchart showing an example of processing in the camera body 2.

In step S100, the interchangeable lens 3 transmits the lens information to the camera body 2 via the connecting portion 202 and the connecting portion 302, and the process proceeds to step S110. The lens information includes information indicating an operation mode that can be set for the interchangeable lens 3.

In step S200, the camera body 2 receives the lens information from the interchangeable lens 3, and proceeds to step S210. In step S210, the camera body 2 determines the operation mode of the interchangeable lens 3 based on the lens information and the shooting mode, for example. The camera body 2 is, for example, a first operation mode in the still image shooting mode, a second operation mode in the moving image shooting mode, and a third operation mode in the case of performing enlarged display in the live view mode or the like. Select. The camera body 2 generates a control signal for controlling the interchangeable lens 3, and proceeds to step S220. Here, the control signal includes information indicating the determined operation mode and information indicating the detection sensitivity of the MF ring operation described later. In step 220, the camera body 2 transmits a control signal to the interchangeable lens 3 via the connection section 202 and the connection section 302, and ends the processing shown in FIG.

FIG. 7 is a table showing an example of operation determination thresholds of the focus ring 135 in the camera 1 according to the first embodiment. The lens control unit 37 treats the bit group (bit 2 to bit 0 shown in FIG. 7) included in the control signal received from the body control unit 21 as a value of 0 (000) to 7 (111) and sets the value to that value. The operation determination threshold is set accordingly. The operation determination threshold is a threshold for determining that the focus ring 135 has been operated. For example, the values "7", "6", "5", "4", "3", "2", "1", and "0" have operation detection sensitivities of "very sensitive" and "sensitive", respectively. , "Slightly sensitive", "Normal", "Slightly insensitive", "Insensitive", "Very insensitive", "Normal". The lens control unit 37 sets the operation determination thresholds to “1”, “2”, “4”, “8”, “16”, “32”, “64”, “8”, for example, according to the detection sensitivity. Set. The lens control unit 37 determines that the focus ring 135 has been operated when the detection unit 40 detects the number of pulses of the operation determination threshold by operating the focus ring 135.

Returning to FIG. 6, in step S110, the interchangeable lens 3 receives the control signal from the camera body 2, and proceeds to step S120. In step S120, the interchangeable lens 3 sets the operation mode and the operation determination threshold value based on the received control signal, and proceeds to step S130. In step S130, when the photographer operates the focus ring 135, the interchangeable lens 3 determines whether the detection unit 40 has detected the number of pulses of the operation determination threshold value. When the interchangeable lens 3 detects the operation of the focus ring 135 based on the number of pulses of the operation determination threshold value, the process proceeds to step S140.

In step S140, when the interchangeable lens 3 is set to the first operation mode or the second operation mode, the interchangeable lens 3 calculates the rotation speed of the focus ring 135, and the focusing lens 33 is calculated based on the rotation speed of the focus ring 135. Position control or speed control. When the interchangeable lens 3 is set to the third operation mode, the interchangeable lens 3 controls the position of the focusing lens 33 based on the operation amount of the focus ring 135. When the drive control of the focusing lens 33 is finished, the lens control unit 37 finishes the process shown in FIG.

According to the above-described embodiment, the following effects can be obtained.
(1) The interchangeable lens 3 includes a detection unit 40 that detects an operation on the operation unit 135 operated by a photographer and outputs a detection signal, a reception unit 39 that receives a control signal from the camera body 2, and a detection unit 40. A control unit 37 that controls at least one of the optical systems 31 to 33 and the diaphragm 34 using the output detection signal and the control signal received by the reception unit 39 is provided. Since it did in this way, the interchangeable lens 3 can perform drive control of the focusing lens 33 based on the control signal from the camera body 2.
(2) The receiving unit 39 receives at least one of the first control signal and the second control signal as the control signal, and the control unit 37 determines when the receiving unit 39 receives the first control signal and when the receiving unit 39 receives the first control signal. Thus, the control for at least one of the optical systems 31 to 33 and the diaphragm 34 is different from that when the second control signal is received. In the present embodiment, the lens controller 37 sets the operation mode for controlling the driving of the focusing lens 33 based on the control signal received from the body controller 21. Therefore, the control of the focusing lens 33 can be changed based on the control signal from the camera body 2.

(3) The control signal is generated based on the operation mode of the camera body 2. Since it did in this way, the focusing lens 33 suitable for each operation mode of the camera body 2 can be controlled, and the operability of manual focus can be improved.

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

(Modification 1)
FIG. 8 is a main part configuration diagram of a camera 1B according to a modification. The interchangeable lens 3B of the camera 1B includes a switch 50 operated by the photographer. The switch 50 functions as an operation unit together with the focus ring 135 illustrated in FIG. In the first modification, when the photographer operates the switch 50, the operation mode of the focusing lens 33 can be changed according to the operation position of the switch 50. Therefore, the control of the focusing lens 33 can be changed based on the operation of the photographer.

For example, the switch 50 can be set to any of the operation positions from the first state to the third state, and transmits the operation signal indicating the set state to the lens control unit 37. The lens controller 37 sets the operation mode of the focusing lens 33 based on the received operation signal. For example, the lens controller 37 operates in the first operation mode described above when the switch 50 is set to the first state, and operates in the second operation mode when the switch 50 is set to the second state. It operates in the operation mode and operates in the third operation mode described above when the switch 50 is set to the third state. For example, the lens control unit 37 determines the moving direction and the moving speed of the focusing lens 33 using the detection signal of the rotation operation of the focus ring 135 and the state of the switch 50 (first state to third state). To do.

Further, for example, the switch 50 can be set to any one of the first to third operation positions, and transmits an operation signal indicating the set state to the lens control unit 37. The lens control unit 37 sets the operation mode of the diaphragm 34 based on the received operation signal. For example, the lens control unit 37 determines the moving direction and the moving speed of the diaphragm 34 using the detection signal of the rotation operation of the operation member 28 (for example, the diaphragm ring) and the operation mode setting of the diaphragm 34. For example, at least one of the focus ring 135, the diaphragm ring, and the switch 50 may be provided in the camera body 2 or the interchangeable lens 3.

(Modification 2)
FIG. 9 is a diagram showing an example of control of the focusing lens 33 according to the modification. The interchangeable lens 3 preliminarily obtains silent speed information, which is used when the focusing lens 33 is to be moved with a low driving sound, for example, by measurement, and stores it in the lens memory 38. The lens controller 37 determines the upper limit value of the driving speed of the focusing lens 33 based on the silent speed information. As shown in FIG. 9, by limiting the driving speed of the focusing lens 33 to the silent speed indicated by the silent speed information, it is possible to suppress the lens driving sound recorded during shooting.

(Modification 3)
In the above-described embodiment, an example in which the control of the focusing lens 33 is changed based on the detection signal according to the operation of the focus ring 135 and the control signal from the camera body 2 has been described, but the present invention is not limited to this. The control of the optical system such as the zoom lens 32 or the diaphragm 34 may be changed based on the detection signal corresponding to the operation of the focus ring 135 and the control signal from the camera body 2.

Further, the setting of the operation mode of the focusing lens 33 according to the control signal is not limited to the above embodiment. As the operation mode, for example, the speed control based on the rotation speed of the focus ring 135 may be performed and the position control based on the rotation position of the focus ring 135 may not be performed. The position control may be performed based on the rotational speed of the focus ring 135 and the speed control based on at least one of the rotational speed and the rotational position of the focus ring 135 may be performed. It may be performed.

(Modification 4)
In the above-described embodiment, the stepping motor has been described as an example of the focusing lens drive motor 331, but the present invention is not limited to this, and for example, another motor such as an ultrasonic motor, a DC motor, a voice coil motor is used. You can also

(Modification 5)
In the above-described embodiment, an example in which the camera body 2 instructs the interchangeable lens 3 to perform the first to third operation modes and the interchangeable lens 3 drives the focusing lens 33 according to the operation amount of the focus ring 135 will be described. did. However, the interchangeable lens 3 notifies the camera body 2 of the operation amount of the focus ring 135, the camera body 2 determines the driving speed of the focusing lens 33 according to the state of the camera 1, and instructs the interchangeable lens 3. May be.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other modes that are conceivable within the scope of the technical idea of the present invention are also included within the scope of the present invention.

2... Camera body, 3... Interchangeable lens, 37... Lens control section, 29, 39... Communication section, 40... Detection section, 33... Focusing lens, 34... Aperture, 135... Focus ring (operation section)

Claims (11)

A detection unit that detects an operation on the operation unit operated by the photographer and outputs a detection signal,
A receiver for receiving a control signal from the camera body,
Using the detection signal output from the detection unit and the control signal received by the reception unit, a control unit that controls the image plane velocity of the optical system,
Equipped with
The control unit controls the image plane speed of the optical system when the operation speed of the operation unit is equal to or higher than a predetermined value; A second mode in which the image plane velocity is not controlled ,
When the operation speed of the operation unit is equal to or more than the predetermined value, the control unit sets the image surface speed of the optical system in the first mode to the image surface speed of the optical system in the second mode. An interchangeable lens that controls to be faster than speed . The interchangeable lens according to claim 1 ,
When the operation speed of the operation unit is equal to or higher than the predetermined value, the control unit controls a third mode for controlling the image plane speed of the optical system, the first mode, and the second mode. Controlled by one of the
When the operation speed of the operation unit is equal to or higher than the predetermined value, the control unit determines that the image plane speed of the optical system in the first mode is the image plane of the optical system in the third mode. Control to be faster than speed,
When the operation speed of the operation unit is equal to or higher than the predetermined value, the control unit determines the image plane speed of the optical system in the third mode as the image plane of the optical system in the second mode. Control to be faster than speed ,
The control unit is an interchangeable lens that controls the image plane velocity of the optical system in the third mode such that the operation amount of the operation unit and the reciprocal of the object distance are proportional to each other . The interchangeable lens according to claim 1 or 2 ,
In the second mode, the controller controls the interchangeable lens to drive the optical system by a drive amount proportional to an operation amount of the operation unit. The interchangeable lens according to any one of claims 1 to 5 ,
In the first mode and the second mode, the control unit does not control the image plane speed of the optical system and operates the operation unit when the operation speed of the operation unit is slower than the predetermined value. An interchangeable lens that controls to drive the optical system by a driving amount proportional to the amount. A detection unit that detects an operation on the operation unit operated by the photographer and outputs a detection signal,
A receiver for receiving a control signal from the camera body,
Using the detection signal output from the detection unit and the control signal received by the reception unit, a control unit that controls the image plane velocity of the optical system,
Equipped with
The control unit controls the image plane speed of the optical system when the operation speed of the operation unit is a predetermined value or more; A second mode in which the image plane velocity is not controlled,
In the second mode, the controller controls the interchangeable lens to drive the optical system by a drive amount proportional to an operation amount of the operation unit. A detection unit that detects an operation on the operation unit operated by the photographer and outputs a detection signal,
A receiver for receiving a control signal from the camera body,
Using the detection signal output from the detection unit and the control signal received by the reception unit, a control unit that controls the image plane velocity of the optical system,
Equipped with
The control unit controls the image plane speed of the optical system when the operation speed of the operation unit is a predetermined value or more; A second mode in which the image plane velocity is not controlled,
In the first mode and the second mode, the control unit does not control the image plane speed of the optical system and operates the operation unit when the operation speed of the operation unit is slower than the predetermined value. An interchangeable lens that controls to drive the optical system by a driving amount proportional to the amount. The interchangeable lens according to any one of claims 1 to 6,
The receiving unit receives at least one of a first control signal and a second control signal as the control signal,
The control unit controls the image plane velocity of the optical system depending on whether the first control signal is received by the reception unit or when the second control signal is received by the reception unit. An interchangeable lens that makes the first mode and the second mode different. The interchangeable lens according to any one of claims 1 to 7,
A storage unit that stores the relationship between the movement amount of the optical system and the movement amount of the image plane,
The control unit is an interchangeable lens that controls the image surface speed based on the relationship stored in the storage unit. The interchangeable lens according to any one of claims 1 to 8,
The detection unit detects an operation on the first operation unit operated by the photographer and outputs a detection signal, detects an operation on the second operation unit operated by the photographer, and outputs a control signal,
The control unit is an interchangeable lens that controls the image plane speed of the optical system using the detection signal and the control signal output from the detection unit. The interchangeable lens according to claim 9,
The first operation unit is an operation ring for moving a focus optical system included in the optical system, and the second operation unit sets a movement amount of the focus optical system with respect to an operation amount of the first operation unit. It is a switch for setting,
The said control part is an interchangeable lens which controls in any one of said 1st mode and said 2nd mode based on operation with respect to the said 2nd operation part. A camera comprising the interchangeable lens according to claim 1.

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