JP2005242114A - Camera and lens, and camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a camera and lens capable of reducing the variation in the positions of diaphragm vanes and improving a side length ratio and a camera system. <P>SOLUTION: In the camera having a camera control means 31 for making communication with the lens, the lens has a light shielding means 2 for changing the aperture diaphragm value of a photographic optical system 1a, a driving means 3 for driving the light shielding means, a diaphragm control means 5 for controlling the open/close state of the light shielding means via the driving means, and a lens control means 11 for controlling the diaphragm control means. When stopping the light shielding means at a target position, the lens control means controls the diaphragm control means at a speed at which the stop position change of the light shielding means diminishes in the position just before the stop based on the signal from the camera control means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in, for example, a camera, a lens, and a camera system having a light shielding unit that changes the aperture value of a photographing optical system and a driving unit that drives the light shielding unit.

  2. Description of the Related Art Conventionally, a camera, a lens, and a camera system that include a light shielding unit that changes the aperture value of a photographing optical system and a driving unit that drives the light shielding unit are known.

  In addition, a camera diaphragm device is disclosed that changes the pulse rate so that the amount of overshoot at the time of stopping the step motor differs between forward rotation and reverse rotation when stopping the step motor driving the light shielding means at the target position. (For example, refer to Patent Document 1).

Also, a preview device for a single-lens reflex camera is disclosed in which the sequence at the time of observation (depth of field confirmation) and the sequence at the time of release are changed to change the narrowing operation at the time of release (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-160753 JP 10-148865 A

  In the camera diaphragm device of Patent Document 1, the aperture width due to the backlash is changed in consideration of the pulse width just before stopping during diaphragm driving. However, in order to improve the side length ratio, the friction is improved so as to further improve stopping during diaphragm driving. Since it is necessary to reduce the impact and to reduce the backlash, it is necessary to change the drive at least two steps before. However, since these items have not been considered, there is a problem that the side length ratio cannot be improved. there were.

  In addition, in the preview device of the single-lens reflex camera in Patent Document 2, since the aperture driving operation such as acceleration / deceleration at the time of observation (when the depth of field is confirmed) and release is not changed, the side length is the same as in Patent Document 1. There was a problem that the ratio could not be improved.

  An object of the present invention is to provide a camera, a lens, and a camera system capable of improving the side length ratio by reducing variations in the position of the aperture blade.

The camera of the invention of claim 1
In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. It is characterized by controlling the means.

The invention of claim 2 is the invention of claim 1,
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 3 is the invention of claim 1,
When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, The diaphragm control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 4 is the invention of claim 1,
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit is configured to stop the light blocking unit at a target position based on a signal from the camera control unit. The aperture control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 5 is the invention of claim 4,
The specific photographing mode is a photographing mode in which photographing time is not prioritized.

The camera of the invention of claim 6
In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. It is characterized by controlling the control means.

The invention of claim 7 is the invention of claim 6,
When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. The aperture control means is controlled so as to decelerate once and then accelerate and then stop.

The invention of claim 8 is the invention of claim 6,
When the set value from the aperture step number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The diaphragm control means is controlled so that the speed is once decelerated, then accelerated, and then stopped.

The invention of claim 9 is the invention of claim 6,
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit determines the speed of the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The diaphragm control means is controlled so as to once decelerate, then accelerate, and then stop.

The invention of claim 10 is the invention of claim 9,
The specific photographing mode is a photographing mode in which photographing time is not prioritized.

The camera of the invention of claim 11
In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. Thus, the diaphragm control means is controlled.

The invention of claim 12 is the invention of claim 11,
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.

The invention of claim 13 is the invention of claim 11,
When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled so as to stop once near the target position, and then stop at the target position after driving.

The invention of claim 14 is the invention of claim 11,
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit sets the light blocking unit to the target position when stopping the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.

The invention of claim 15 is the invention of claim 14,
The specific photographing mode is a photographing mode in which photographing time is not prioritized.

The lens of the invention of claim 16 comprises:
In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. It is characterized by controlling the means.

The invention of claim 17 is the invention of claim 16,
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 18 is the invention of claim 16,
When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, The diaphragm control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The lens of the invention of claim 19 comprises:
In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. It is characterized by controlling the control means.

The invention of claim 20 is the invention of claim 19,
When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. The diaphragm control means is controlled so as to once decelerate, then accelerate, and then stop.

The invention of claim 21 is the invention of claim 19,
When the set value from the aperture step number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The diaphragm control means is controlled so that the speed is once decelerated, then accelerated, and then stopped.

The lens of the invention of claim 22
In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. Thus, the diaphragm control means is controlled.

The invention of claim 23 is the invention of claim 22,
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.

The invention of claim 24 is the invention of claim 22,
When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled so as to stop once near the target position, and then stop at the target position after driving.

The camera system of the invention of claim 25 is
In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. It is characterized by controlling the means.

The invention of claim 26 is the invention of claim 25, wherein
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 27 is the invention of claim 25,
When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, The diaphragm control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 28 is the invention of claim 25, wherein
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit is configured to stop the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled at a speed at which the change in the stop position of the light shielding means becomes small.

The invention of claim 29 is the invention of claim 28, wherein
The specific photographing mode is a photographing mode in which photographing time is not prioritized.

The camera system of the invention of claim 30
In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. It is characterized by controlling the control means.

The invention of claim 31 is the invention of claim 30,
When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. The diaphragm control means is controlled so as to once decelerate, then accelerate, and then stop.

The invention of claim 32 is the invention of claim 30,
When the set value from the aperture step number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The diaphragm control means is controlled so that the speed is once decelerated, then accelerated, and then stopped.

The invention of claim 33 is the invention of claim 30,
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit determines the speed of the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The diaphragm control means is controlled so as to once decelerate, then accelerate, and then stop.

The invention of claim 34 is the invention of claim 33,
The specific photographing mode is a photographing mode in which photographing time is not prioritized.

The camera system of the invention of claim 35 comprises
In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. Thus, the diaphragm control means is controlled.

The invention of claim 36 is the invention of claim 35,
When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. The stop control means is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.

The invention of claim 37 is the invention of claim 35,
When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled so as to stop once near the target position, and then stop at the target position after driving.

The invention of claim 38 is the invention of claim 35, in which
When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit sets the light blocking unit to the target position when stopping the light blocking unit at a target position based on a signal from the camera control unit. The stop control means is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.

The invention of claim 39 in the invention of claim 38,
The specific shooting mode is a shooting mode in which shooting time is not prioritized.

  According to the present invention, when the light shielding means is stopped at the target position, the lens control means, based on a signal from the camera control means, at a speed before the stop position change of the light shielding means becomes small at a position before the stop. By controlling the control means, it is possible to achieve a camera, a lens, and a camera system that can reduce variations in the position of the diaphragm blades and thereby improve the side length ratio.

  Further, according to the present invention, when the light shielding means is stopped at the target position, the lens control means once decelerates the speed of the light shielding means based on a signal from the camera control means, and then accelerates and then stops. By controlling the aperture control means, it is possible to reduce the variation in the position of the aperture blades, thereby achieving a camera, a lens and a camera system that can improve the side length ratio.

  According to the present invention, when the light shielding means is stopped at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the target position. By controlling the aperture control means so as to stop, the variation in the position of the aperture blades can be reduced, thereby achieving a camera, lens and camera system capable of improving the side length ratio. Can do.

  Hereinafter, the present invention will be described in detail based on illustrated embodiments.

  FIG. 1 is a configuration diagram of a camera system according to Embodiment 1 of the present invention. In FIG. 1, a lens that is a camera accessory is shown on the left side with respect to a dotted line A, and a camera body (camera) is shown on the right side.

  In the figure, reference numeral 1 denotes a lens barrel, which holds a plurality of lenses G1, G2, and G3 constituting a photographing lens (photographing optical system) 1a. Reference numeral 2 denotes an aperture (aperture device) having a plurality of aperture blades as light shielding means, which is driven to open and close by a motor (aperture drive motor) 3 as drive means via a gear 4. Reference numeral 5 denotes an aperture control circuit as aperture control means, which controls the open / close state of the aperture 2 via the motor 3 based on a signal from a lens control CPU 11 as lens control means provided on the lens barrel 1 side.

  The opening / closing drive of the diaphragm 2 is the main point of this embodiment. When the diaphragm 2 is stopped at the target position as will be described later, the lens controller 11 is based on a signal from the camera controller 31 provided on the camera side. Thus, the aperture control means 5 is controlled at such a speed that the stop position change of the aperture 2 becomes small at the position before the stop.

  A focus driving motor 6 drives the focus lens G1 of the photographing lens 1a in the direction of the optical axis 1b via the worm gear 7 to perform focus driving.

  A motor control circuit 8 controls the driving state of the motor 6 based on a signal from the lens control CPU 11 and performs focus driving. A pulse plate 9 is attached to a rotary shaft connected to the focus driving motor 6. Reference numeral 10 denotes a photo interrupter that detects the rotation state of the pulse plate 9 and inputs the detection result to the lens control CPU 11.

  Reference numeral 12 denotes a focus zone detector, which has a switch for detecting the position of the focus lens G1, for example, by moving a brush on an electrode arranged on a plane or curved surface. The lens control CPU 11 communicates optical information at the position of the focus lens G1 to the camera control CPU 31 as camera control means in accordance with the output of the focus zone detector 12, and the diaphragm according to the position of the focus lens G1. Drive control of the control circuit 5 and the motor control circuit 8 is performed.

  Here, each terminal of the lens control CPU 11 on the lens side will be described.

CK is a clock input terminal for synchronizing communication between the camera control CPU 31 on the camera body side and the lens control CPU 11 on the lens side. DO is a data output terminal for transmitting lens side data to the camera body side, and DI is a data input terminal for inputting data and commands from the camera body side. Data communication will be described later. M1 is a focus drive motor control terminal for controlling ON / OFF, drive speed, drive direction, and drive amount of the focus drive motor 6, and CK, D0, and DI are terminals for transmitting and receiving signals from the camera control CPU 31. . CK, D0, DI, V _DD, etc. constitute one element of the connecting means. M2 is an aperture drive motor control terminal for controlling ON / OFF, drive speed, drive direction, and drive amount of the aperture drive motor 3. PI is a detection terminal for detecting the rotation amount and rotation speed of the focus drive motor 6.

  Reference numeral 13 denotes a zoom detector, which detects the position of the zoom lens using a switch such as a brush. The lens control CPU 11 communicates optical information at the position of the zoom lens to the camera control CPU 31 according to the output of the zoom detector 13, and drives the aperture control circuit 5 and the motor control circuit 8 according to the position of the zoom lens. Take control.

  An image blur correction drive circuit 14 energizes the image blur correction motor 15 to drive the image blur correction lens G2 independently on the pitch axis and yaw axes in a plane perpendicular to the optical axis 1b. Reference numeral 16 denotes an image blur correction lens position detection unit that detects a movement amount of two axes of a pitch axis and a yaw axis. Specifically, a light projecting LED (not shown) is arranged so as to move together with the image blur correction lens G2, and the position of the image blur correction lens G2 is detected by detecting the movement amount of the LED with a light receiving PSD (not shown). This is detected and transmitted to the lens control CPU 11.

  Reference numeral 17 denotes a fixing mechanism driving circuit that drives a fixing mechanism 18 for fixing the image blur correction lens G2 when image blur correction driving such as power OFF is not performed.

  The lens control CPU 11 controls various operations on the lens side based on signals from a camera control CPU 31 provided on the camera body side. In the lens control CPU 11, information on the image and circle, information on the flange and back, ID data indicating the product type of the lens, AE optical data for automatic exposure control, AF optical for automatic focus adjustment, etc. Data, optical data for image processing including spectral transmittance data, and the like are stored.

  On the camera body side, reference numeral 21 denotes a main mirror that rotates obliquely and retractably with respect to a photographing optical path through which a photographing light flux passes, and a central portion is a half mirror surface 21a. When the main mirror 21 is in an oblique state, a part of the photographic light beam that has passed through the photographic lens 1 a is reflected in the direction of the focus plate (focus screen) 23. As a result, a subject image is formed on the focus plate 23 surface. Reference numeral 22 denotes a sub-mirror, which is disposed on the back surface of the main mirror 21. The sub mirror 22 reflects the light beam that has passed through the half mirror surface 21 a of the main mirror 21 in an oblique state to the focus detector 30.

  A pentaprism 24 guides the subject image formed on the surface of the focusing plate 23 to the eyepiece 25 as an erect image. A focal plane shutter 26 is driven by a shutter drive circuit 27. Reference numeral 28 denotes an optical low-pass filter for preventing aliasing in the image sensor. A photometric element 29 measures the illuminance on the surface of the focusing plate 23 and inputs the measurement result to the camera control CPU 31.

  The camera control CPU 31 on the camera body side controls various operations on the camera body side, and controls various operations on the lens by communicating with the lens control CPU 11 on the lens side. The camera control CPU 31 stores necessary optical data and design values of lenses that are already manufactured and usable, correction data relating to the sensitivity of each pixel of the image sensor 41 measured at the time of manufacture, and the like.

  Here, each terminal of the camera control CPU 31 on the camera body side will be described.

CK is a clock output terminal for synchronizing communication between the camera control CPU 31 on the camera body side and the lens control CPU 11 on the lens side. _LIN is an input terminal for lens side data, and L _OUT is a data output terminal for outputting commands and data from the camera body side to the lens side. S1 is an input terminal of the distance measurement / photometry start switch 34, and S2 is an input terminal of the release switch 35. AF _IN is a data input terminal of the focus detection element 30, and AE _IN is a data input terminal of the photometry element 29. SH _OUT is an output signal terminal to the shutter drive circuit 27.

  Reference numeral 34 denotes a metering / ranging start switch (hereinafter also referred to as a switch SW1), and reference numeral 35 denotes a release switch (hereinafter also referred to as a switch SW2). 55 is a depth-of-field confirmation switch. When the switch is turned on, the camera control CPU 31 communicates to that effect to the lens control CPU 11, and the lens control CPU 11 drives the aperture 2 to perform the aperture reduction, so that the user can Be able to check the depth of field. A battery 36 serves as a power source for driving the camera body and the lens. Reference numeral 37 denotes a stabilized power source that stabilizes the power source of the battery 36 to a necessary voltage and supplies the same to the camera control CPU 31. Reference numeral 38 denotes an operation unit for setting a shooting mode of the camera, 39 denotes a lens detection unit for detecting a lens mounting state, and 40 denotes an optical low-pass filter detection unit for detecting the mounting state of the optical low-pass filter 28.

  The camera control CPU 31 displays the presence / absence of the optical low-pass filter 28 on a display unit (not shown). Further, the image processing method to be described later can be partially changed depending on the presence or absence of the optical low-pass filter 28 by setting the operation unit 38.

  Reference numeral 41 denotes an image sensor that captures an image obtained by the lens side while the focal plane shutter 26 is open. For example, there are a CMOS sensor, a CCD, and the like that can read out the accumulated charges nondestructively.

  Reference numeral 42 denotes a driver circuit for horizontal driving and vertical driving of each pixel of the image pickup device 41. The image pickup device 41 generates an image signal output by being driven with a predetermined output. As will be described later, the pixels output from the image sensor 41 are changed according to the image circle received by the image sensor 41.

  Reference numeral 43 denotes a CDS / AGC circuit, which removes noise from the output signal of the image sensor 41 with a known CDS circuit and adjusts the amplification degree of the output signal with a known AGC circuit. Reference numeral 44 denotes a timing generator (TG) that is controlled by the camera control CPU 31 and determines the overall drive timing. Image processing is performed by the timing generator 44 that is suitable for managing a shorter time than the camera control CPU 31 because it is necessary to perform a predetermined operation in a short time. The CDS / AGC circuit 43 is similarly controlled by the outputs of the camera control CPU 31 and the timing generator 44.

  Reference numeral 45 denotes an AD conversion circuit. The output of the CDS / AGC circuit 43 is AD-converted by the outputs of the camera control CPU 31 and the timing generator 44, and is output as digital data of each pixel. A frame memory 46 stores the output of the AD conversion circuit 45. Further, in the case of continuous shooting or the like, all the pixel data are temporarily stored in the frame memory 46.

  Reference numeral 47 denotes a camera DSP, which generates RGB color signals from the output of the AD conversion circuit 45 or the pixel data stored in the frame memory 46 based on the outputs of the camera control CPU 31 and the timing generator 44. At this time, image processing data of the lens is used, and image processing is performed according to the presence or absence of the optical low-pass filter.

  A video memory 48 stores image data suitable for display on the display unit 49. When the operation member 38 is operated, the image data created by the camera DSP 47 is stored and displayed on the display unit 49 by the outputs of the camera control CPU 31 and the timing generator 44.

  Reference numeral 50 denotes a work memory which stores an output obtained by performing image processing with the camera DSP 47. A compression / decompression unit 51 compresses and decompresses data based on a predetermined compression format based on outputs from the camera control CPU 31 and the timing generator 44.

  A nonvolatile memory 52 stores data compressed by the compression / decompression unit 51. For example, a non-volatile memory such as a flash memory or a hard disk is used. When observing compressed image data that has been shot and stored in the non-volatile memory 52, the compression / expansion unit 51 decompresses the data into normal data for each captured pixel, stores the data in the video memory 48, and performs the display unit 49. .

  The processing at the time of shooting is configured to be executed in a short time, and data can be stored from the work memory 50 to the nonvolatile memory 52 and displayed on the display unit 49 immediately after shooting.

  Next, data communication between the lens control CPU 11 on the lens side and the camera control CPU 31 on the camera side will be described with reference to FIG.

  FIG. 2 is a timing chart showing communication between the lens and the camera body.

In the figure, CK, DI (L _OUT ), and DO (L _IN ) are signal lines for performing serial communication between the camera body and the lens as described above. Communication is performed in 8 bits, and 8 clocks are one communication cycle.

DI (L _OUT ) is a signal line for sending commands and data from the camera body side to the lens side. In the first communication cycle shown in the figure, DI (L _OUT ) indicates 00010000B (B represents binary data). DO (L _IN ) is a signal line for sending data from the lens side to the camera body side. In the figure, data of a communication result one cycle before the first communication cycle appears. It has become.

  In the figure, BUSY indicates that the lens control CPU 11 has received a command from the camera body and is executing processing, so the lens control CPU 11 is at 0 level. The camera control CPU 31 confirms that BUSY has become 1 level, and further performs the next communication after a predetermined time has elapsed.

  Next, an example of a communication command between the camera body and the lens will be described.

  The command system is based on the camera and is displayed in hexadecimal. 00H is not set. 01H is an ID code reception request command including image / circle information, flange / back information, lens type, product version, and function data. Reference numeral 02H denotes an AF optical data and AE optical data reception request command such as the focal length of the photographing lens, the open f value of the photographing lens, the AF sensitivity, the AF error correction amount, the minimum aperture value, and the number of apertures. 03H is a command for setting the drive direction and speed of the focus drive motor 6. 04H is a drive amount setting command for the lens barrel 1. 05H is a command for setting the driving direction and setting of the aperture driving motor 3, aperture driving speed setting, driving for observation (when checking depth of field), aperture driving installation not prioritizing speed, and the like. 06H is a drive amount setting command for the diaphragm 2. 07H is a drive amount setting command for the image blur correction lens G2.

  Next, the focus driving operation on the lens side will be described.

  Through the communication between the lens and the camera body, the camera control CPU 31 on the camera body side obtains data relating to the focus within the lens (hereinafter referred to as AF optical data). The camera control CPU 31 calculates the required movement amount of the focus lens G1 based on the AF optical data and the output of the focus detection element 30, and the calculation result (focus lens movement amount) is sent to the lens control CPU 11 on the lens side. connect.

  The lens control CPU 11 on the lens side drives the focus drive motor 6 via the motor control circuit 8. With the rotation of the focus drive motor 6, the focus lens G1 in the lens barrel 1 is moved in the optical axis direction by the rotation of the worm gear 7 attached to the rotation shaft of the focus drive motor 6. A pulse plate 9 is attached to the rotating shaft so as to be integrally rotatable. When the focus drive motor 6 rotates, the pulse plate 9 also rotates. At this time, the interrupter 10 sends a signal to the lens control CPU 11 on the lens side every time the detection light passes through the slit on the pulse plate 9 (or every time the detection light is blocked by the pulse plate 9), and the lens control CPU 11 Counts this signal with an internal pulse counter to recognize how many times the focus drive motor 6 has rotated, that is, how much the focus lens G1 has moved.

  In this way, when the focus lens G1 moves by the amount of movement of the focus lens communicated by the camera control CPU 31 on the camera side, the rotation of the focus drive motor 6 is stopped and the focus is completed.

  Next, the lens-side aperture driving operation will be described.

  The camera control CPU 31 on the camera body side obtains data relating to the aperture 2 in the photographing lens 1a (hereinafter referred to as AE optical data) through communication between the lens and the camera body. The camera control CPU 31 calculates the aperture diameter of the diaphragm 2 based on the AE optical data and the output from the photometry element 29 and communicates with the lens control CPU 11 on the lens side. The lens control CPU 11 on the lens side drives the motor 3 by the aperture control circuit 5, and drives the aperture 2 so that the aperture diameter matches the set value set by the camera control CPU 31 on the camera side. The driving of the diaphragm 2 will be described later.

  Next, an image blur correction drive operation on the lens side will be described.

  By the communication between the lens and the camera body, the camera control CPU 31 on the camera body side obtains data relating to image blur correction in the photographing lens 1a (hereinafter referred to as IS optical data). The camera control CPU 31 calculates an image blur correction drive amount based on the optical data for IS and an output from the image blur correction lens position detection unit 16 and communicates with the lens control CPU 11 on the lens side. The lens control CPU 11 on the lens side drives the image blur correction motor 15 by the image blur correction drive circuit 14, and drives the image blur correction lens G2 so that the movement amount set by the camera control CPU 31 on the camera side is obtained.

  Next, the diaphragm 2 and the diaphragm driving motor 3 will be described in detail.

  3 to 5 are diagrams for explaining the diaphragm drive motor 3, FIG. 3 is an exploded perspective view of a stepping motor as an electromagnetic drive motor, FIG. 4 is a sectional view of the stepping motor, and FIG. FIG.

  3, 4, and 5, reference numeral 61 denotes a first rotor in which a magnetized portion is formed so that six magnetic poles are formed on the outer peripheral surface, and a rotation shaft 61 a, a rotation shaft 61 b, a rotation output portion, and A gear 61c (corresponding to the gear 4 in FIG. 1) and a shaft portion 61d are integrally formed.

  Reference numeral 62 denotes a second rotor having a magnetized portion formed so that six poles can be formed on the outer peripheral surface, and has a hole 62a at the center. The second rotor 62 has a gear portion 61a (corresponding to the gear 4 in FIG. 1) at the thrust center portion in the direction of the rotation axis of the rotor when the hole portion 62a is inserted into and fixed to the shaft portion 61d of the first rotor 61. And a cylindrical portion having a magnetized portion on the outer peripheral surface and having a cylindrical portion on the upper and lower sides of the thrust portion of the gear 61c. The first rotor 61 and the second rotor 62 are fixed so that their rotational phases with respect to their magnetized portions are shifted from each other by 90 degrees in electrical angle.

  63 is a first stator yoke formed of a soft magnetic material, and has two protrusions 63a and 63b facing the magnetic pole of the first rotor 61. The protrusion 63a and the protrusion 63 b is arranged with an electrical angle of 360 ° apart from the magnetic pole of the first rotor 61.

  Reference numeral 64 denotes another first stator yoke formed of a soft magnetic material, and has two protruding portions 64a and 64b facing the magnetic pole portion of the first rotor 61, and the protruding portion 64a. And the protrusion 64b are arranged with an electrical angle of 360 ° apart from the magnetic pole of the first rotor 61. The protrusion 64a is provided with an electrical angle of 180 ° with respect to the protrusion 63a, and the protrusion 64b is provided with an electrical angle of 180 ° with respect to the protrusion 63b. On the other hand, the first stator yoke 63 and the first stator yoke 64 are in contact with each other at the base portions 63c and 64c, thereby closing the magnetic path between the first rotor 61 and the two-phase type stepping motor. Constitutes one of the phases.

  65 is a second stator yoke constituted by the same parts as the first stator yoke 63, and has two locations facing the magnetic pole portion of the second rotor 62 and projections 65a and 65b. The protrusion 65 a and the protrusion 65 b are arranged with an electrical angle of 360 ° apart from the magnetic pole of the second rotor 62.

  Reference numeral 66 denotes another second stator yoke that is the same as the first stator yoke 64 and is configured by parts, and has two protrusions 66 a and 66 b that face the magnetic pole part of the second rotor 62. The protrusion 66 a and the protrusion 66 b are arranged with an electrical angle of 360 ° apart from the magnetic pole of the second rotor 62. The protrusion 6a is provided with an electrical angle of 180 ° with respect to the protrusion 65a, and the protrusion 66b is provided with an electrical angle of 180 ° with respect to the protrusion 65b. On the other hand, the second stator yoke 65 and the second stator yoke 66 are in contact with each other at the base portions 65c and 66c, thereby closing the magnetic path between the second rotor 62 and the two-phase type stepping motor. Constitutes the other phase. The first stator yokes 63 and 64 are arranged so as to overlap the second stator yokes 65 and 66 in the rotational axis direction of the rotor α.

  67 is a first coil that has terminal portions 67a and 67b and is inserted into the first stator yoke 63. The first coil 67 is energized through the terminal portions 67a and 67b. The stator yoke 63 and the first stator yoke 64 are excited.

  68 is a second coil composed of the same components as the first coil 67. The second coil 68 is inserted into a second stator yoke 65 having terminal portions 68a and 68b. The second stator yoke 65 and the second stator yoke 66 are excited by energizing the second coil 68 through 68b. The first coil 67 and the second coil 68 are arranged so as to be concentrated in one direction outside the outer peripheral portion of the rotor α.

  Reference numeral 69 denotes a first motor case for positioning and fixing the first stator yoke 63 and the first stator yoke 64 by a known method. The first motor case 69 includes a rotating shaft 61a of the first rotor 61. Has a hole 69a to be rotatably fitted.

  Reference numeral 70 denotes a second motor case for positioning and fixing the second stator yoke 65 and the second stator yoke 66 by a known method. The second motor case 70 includes a rotating shaft 61b of the first rotor 61. Has a hole portion 70a that fits in a rotatable manner. Further, the second motor case 70 is provided with claw portions 70b and 70c, and the claw portions 70b and 70c are inserted into the groove portions 69b and 69c provided in the first motor case 69 for positioning engagement. Therefore, it is unitized as a stepping motor. (See FIGS. 4 and 5).

  As can be seen from the above description, the rotational output of the stepping motor of the present invention is such that the gear 61c (corresponding to the gear 4 in FIG. 1) is provided at the center of the thrust in the rotational axis direction of the rotor α. The rotation output is taken out from the thrust gap between the one stator yoke 63, 64 and the second stator yoke 65, 66.

  Next, the operation of this electromagnetic drive motor (stepping motor) will be described with reference to FIG.

  FIG. 6 shows a case where 1-2 phase driving is performed as a stepping motor driving method. Further, in FIG. 6, the diagram shown on the left side shows one phase portion (for example, A phase) of the stepping motor that forms the magnetic circuit by the first stator yokes 63 and 64, and the diagram shown on the right side shows the second phase. The other one-phase part (for example, B phase) of the stepping motor which forms a magnetic circuit by the stator yokes 65 and 66 is shown. The operation will be described below.

  First, FIG. 6A shows an initial state. In this state, the first coil 7 is energized to excite the projections 63a and 63b of the first stator yoke 63 to the S pole and the projections 64a and 64b of the first stator yoke 64 to the N pole. By doing so, the angle center of the magnetized portion of the first rotor 61 is matched with the angle center of the protrusions 63a, 63b, 64a, 64b. On the other hand, since the second coil 68 is not energized, the second stator yokes 65 and 66 are not excited, and the center of the magnetization angle of the second rotor 62 is the protrusion of the second stator yokes 65 and 66. It is positioned so as to be shifted by 90 ° in electrical angle with respect to the angular centers of 65, 65b, 66a, 66b.

  From this state, the second coil 68 is energized to excite the projections 65a and 65b of the second stator yoke 65 to the S pole and the projections 66a and 66b of the second stator yoke 66 to the N pole. The second rotor 62 is attracted and repelled by the magnetic poles, and the rotor α itself (the first rotor 61 and the second rotor 62) rotates in the clockwise direction. On the other hand, since the first stator yokes 63 and 64 continue to be excited, the rotor α (the first rotor 61 and the second rotor 62) is stationary with an electrical angle of 45 ° (see FIG. 6 (B) state).

  Next, when the excitation of the first stator yokes 63 and 64 is released, the second rotor 62 is excited by the excitation of the second stator yokes 65 and 66, and the projection 65a , 65b, 66a, 66b, and stops in a state where it is further rotated clockwise by 45 ° in electrical angle so as to coincide with the center of the angle (state of FIG. 6 (C)).

  Next, the first coil 7 is energized again. This time, the protrusions 63a and 63b of the first stator yoke 63 are set to the N pole, and the protrusions 64a and 64b of the first stator yoke 64 are set to the S pole. Excited to become. As a result, the first rotor 61 is attracted and repelled by the respective magnetic poles, and the rotor α itself (the first rotor 61 and the second rotor 62) further rotates clockwise. On the other hand, since the second stator yokes 65 and 66 continue to be excited, the rotor α (the first rotor 61 and the second rotor 62) stops in a state where the electrical angle is rotated 45 ° clockwise. (State in FIG. 6D).

  Next, when the excitation of the second stator yokes 65, 66 is released, the first rotor 61 is excited by the excitation of the first stator yokes 63, 64, and the magnetized portion angle center of the first rotor 61 is projected 63 a, It stops in a state where it is further rotated by 45 ° in an electrical angle clockwise so as to coincide with the angle center of 63b, 64a, 64b (state (E) in FIG. 6). By continuing this relationship, the motor can be rotated. In order to rotate counterclockwise, the above-described excitation relationship may be reversed.

  Next, the diaphragm device will be described with reference to FIG.

  FIG. 7 is a perspective view for assembling the diaphragm device. In FIG. 7, the diaphragm device is generally indicated by a symbol B, and the above-described electromagnetic drive motor A is attached to the diaphragm device B.

  In FIG. 7, reference numeral 71 denotes a conductive annular ground plate having an opening through which photographing light passes in the center. The first motor case 69 described above is fixed to the annular ground plate 71 by a known method such as adhesion or press fitting. Thus, the electromagnetic drive motor A is fixed to the diaphragm device B.

  Reference numeral 72 denotes an annular cam plate which is an insulating member, and a plurality of well-known diaphragm cam plates 72a are cut in the cam plate 72.

  Reference numeral 73 denotes a plurality of diaphragm blades, and dowels 73 a on the back surface of the respective diaphragm blades 73 are fitted into the diaphragm cams 72 a of the cam plate 72.

  Reference numeral 74 denotes a rotating ring that rotates about the optical axis. The rotating ring 74 has an opening through which photographing light passes, and a plurality of holes 74a provided in the rotating ring 74 includes surface dowels 73b of the diaphragm blades 73, respectively. It is mated. The flange portion 74 b of the rotating ring 74 is fitted in the hole 71 a of the annular ground plate 71, and the rotating ring 74 is rotatably supported by the annular ground plate 71. The rotating ring 74 is provided with a gear portion 74c, and the gear portion 74c is configured to mesh with the gear portion 61c of the first rotor 61 in the electromagnetic drive motor A. Further, the rotating ring 74 is provided with a protrusion 74 d, and the protrusion 74 d is configured to be inserted into a long hole 71 b provided in the annular base plate 71. On the other hand, a pedestal 72b is provided on the cam plate 72, and the pedestal 72b is inserted into a hole 71c provided in the annular ground plate 71 and fixed by a known method such as screwing to sandwich the rotating ring 74, An aperture device B is configured by unitizing the annular base plate 71, the cam plate 72, the aperture blades 73 and the rotating ring 74. The diaphragm device B includes a switch for detecting whether or not the diaphragm is open.

  Reference numeral 75 denotes a photo interrupter which is a component of the switch, and is fixed to the annular base plate 71 by a known method such as adhesion. The method for detecting whether or not the aperture by the photo interrupter is open is as follows. When the aperture is opened by the projecting portion 74d of the rotating ring 74, the projection and light receiving relation of the photo interrupter is shielded to open the aperture. Detect that. The above is the configuration of the diaphragm device B.

  The operation of the above configuration will be described.

  When the electromagnetic drive motor A rotates, its output is transmitted to the gear portion 74c of the rotating ring 74 by the gear 61c (corresponding to the gear 4 in FIG. 1) of the first rotor 61, and rotates the rotating ring 74 by a predetermined angle. Due to the rotation of the rotating ring 74, the surface dowel 73b of the diaphragm blade 73 is moved in the rotating direction. The back surface dowel 73a of the diaphragm blade 73 performs a known diaphragm operation by swinging the diaphragm blade 73 in the opening direction or the closing direction in accordance with the relative relationship with the diaphragm cam 72a provided on the cam plate 72, and exposure adjustment is performed. .

  Next, the arrangement relationship (layout relationship) between the electromagnetic drive motor A and the diaphragm device B will be described with reference to FIGS.

  FIG. 8 is a cross-sectional view of an electromagnetically driven aperture device equipped with an electromagnetically driven motor A, and FIG. 9 is a partial plan view of the electromagnetically driven aperture device.

  First, as can be seen from FIG. 8, the first stator yokes 63 and 64 are accommodated in the thrust space of the annular base plate 71, while the second stator yokes 65 and 66 are accommodated in the thrust space of the cam plate 72 and are annular. The gear 1c of the first rotor 61 is connected to the first stator yokes 63, 64 and the second stator yoke 65, so as to be able to mesh with the gear portion 74c of the rotating ring 74 sandwiched between the base plate 71 and the cam plate 72. An electromagnetic drive diaphragm equipped with an electromagnetic drive motor with a very good matching that can be housed in such a manner that the electromagnetic drive motor A hardly protrudes from the diaphragm device B because it is provided between 66 (the thrust direction center of the rotor rotation axis). Equipment can be provided.

  When the electromagnetic drive motor A is attached to the diaphragm device B, the electromagnetic drive motor A itself is slid in a direction perpendicular to the rotational axis direction of the rotary ring 74 in the diaphragm device B, and the gear portion of the rotary ring 74 is It can be attached by meshing the gear 61c in the electromagnetic drive motor A with 74c.

  Next, as can be seen from FIGS. 8 and 9, in the diaphragm blade 73, the hatched portion penetrates into the electromagnetic drive motor A portion. That is, they are arranged so that the movement locus of the diaphragm blade 73 can enter the thrust gap between the first stator yokes 63 and 64 and the second stator yokes 65 and 66.

  As described above, the diaphragm blade 73 operates. However, the movement position of the diaphragm blade 73 may vary due to the frictional force of the diaphragm blade 73 and the backlash of gears and cams.

  The variation of the aperture position is determined so as to be within the specification of the variation of the opening area so that the amount of light projected onto the image sensor is not affected. However, even if the aperture area is within the standard, if the aperture aperture shape changes, the shape of the blur that occurs on the screen when the focus position to the subject is shifted (not in focus) in the captured image is reduced. This reflects the shape of the opening and degrades the image quality.

  Next, the side length ratio indicating the quality of the aperture blade shape will be described.

  FIG. 10 is a diagram showing the position of the diaphragm blade with a good side length ratio, and FIG. 11 is a diagram showing the position of the diaphragm blade with a deteriorated side length ratio. FIG. 10 shows a state in which the aperture is open, and FIG. 11 shows a state in which the aperture is closed.

  10 and 11, the lengths of the aperture blades forming the aperture opening shape are indicated by a (shortest length) and b (longest length). As the side length ratio a / b, which is the ratio of the lengths, is closer to 1, the opening shape becomes symmetrical. (In some cases, a = b.) Although the aperture opening shape is substantially circular in FIG. 10, the position of the aperture blade having the side length ratio a / b = 0.45 which is extremely deteriorated in FIG. Show.

  In order to improve the side length ratio, it is necessary to reduce the variation in the stop position of the aperture blade. The main causes of variations in the stop position of the aperture blade include frictional force generated by the aperture blade and the play of gears and cams.

  First, the improvement of variation in the stop position depending on the frictional force caused by the diaphragm blades will be described.

  FIGS. 12A and 12B are diagrams showing the relationship between the position and speed of the diaphragm blades near the stop position of the diaphragm blades. The horizontal axis represents the position of the diaphragm blades, and the vertical axis represents the speed of the diaphragm blades.

here,
x: Position of the diaphragm blade V: Speed of the diaphragm blade V0: Initial speed of the diaphragm blade (here, the speed immediately before stopping, and the number of energization steps of the stepping motor is two steps or more)
f: Friction force acting on diaphragm blades, etc. m: Mass of diaphragm blades, etc. t: When time is taken, the relationship is simply V = V0-2 · (f / m) · t
x = V0 · t− (f / m) · t ²
It becomes.

When the time t (t0) at which the speed V = 0 is obtained,
t0 = (m · V0) / (2 · f)
The position x (x0) at this time is
x0 = (m · V0 ² ) / (4 · f)
Here, the frictional force f varies depending on the speed, position, disturbance, etc., but for simplicity, if f ± Δf is set,
x0 = (m · V0 ² ) / (4 · (f ± Δf))
It becomes.

When the initial speed V0 is V1, the stop position is x1 ± Δx1,
Assuming that the stop position when the initial speed V0 is V2 is x2 ± Δx2,
x1 ± Δx1 = (m · V1 ² ) / (4 · (f ± Δf))
x2 ± Δx2 = (m · V2 ² ) / (4 · (f ± Δf))
Furthermore, when V2 = V1 / 2,
x2 ± Δx2 = (m · V1 ² ) / (4 · (4 · (f ± Δf)))
= (X1 ± Δx1) / 4
Thus, the stop position and its variation change with the square of the speed and become 1/4.

  Therefore, it is necessary to set the stop position to a stop blade speed before stopping within the variation in the side length ratio.

  Next, FIGS. 13A and 13B show states of acceleration and deceleration of the diaphragm blades. 13A and 13B, the vertical axis represents the speed of the diaphragm blades, and the horizontal axis represents the position of the diaphragm blades. Acceleration / deceleration close to an exponential function is performed because sudden acceleration / deceleration may result in step-out. FIG. 13A shows a conventional acceleration / deceleration state, where the speed of the diaphragm blades is V1 at a position two steps or more before the target stop position of the diaphragm blades by the number of steps of the stepping motor. On the other hand, FIG. 13B shows the acceleration / deceleration state of the present embodiment, and the speed of the diaphragm blades is V2 at a position two steps or more before the target stop position of the diaphragm blades.

  For simplicity of explanation, the speed of the diaphragm blades is shown as a single value, but each diaphragm blade moves with variations not only in position but also in speed due to backlash such as gears and cams.

  Although V2 is used here, the speed varies depending on the blade shape, mass, surface treatment, driving direction, stop position, number of aperture stages, and the like, and the speed must satisfy these conditions. Alternatively, it is necessary to change the speed according to each condition so as to satisfy each condition.

  In the above, the variation in the stop position depending on the frictional force has been described.

  Next, the relationship between the stop position of the aperture blade due to the friction between the gear, cam, etc. and the friction of the aperture blade and the stepping motor drive step will be described with reference to FIG.

  In FIG. 14, the horizontal axis represents the number of steps of the stepping motor, and the vertical axis represents the position of the aperture blade. In FIG. 14, the influence of the frictional force caused by the diaphragm blades and the influence of the play of the gears, cams, etc. are greatly shown for explanation.

  Up to N steps show the case where the diaphragm is driven at a driveable speed in order to reduce the aperture driving time. In N steps, it can be seen that the position of the diaphragm blades varies due to the influence of the backlash of gears, cams and the like and the friction of the diaphragm blades.

“Gear (+) + Friction (+)” on the vertical axis
As a result of driving from the N-1 step to the N step, when the driving step position of the stepping motor is the N step, the aperture blade moves more than the design center value due to the backlash of the gear and the cam, and the frictional force by the aperture blade is reduced. It shows that the diaphragm blades moved more due to the less influence.

"Gear (0) + Friction (+)"
As a result of driving from the N-1 step to the N step, when the driving step position of the stepping motor is the N step, the aperture blade moves to the design center value regardless of the backlash of the gear and the cam, etc., and the influence of the frictional force by the aperture blade This indicates that the aperture blade has moved a lot due to the small amount of.

"Gear (0) + Friction (0)"
As a result of driving from the N-1 step to the N step, when the driving step position of the stepping motor is the N step, the aperture blade moves to the design center value regardless of the play of the gear and the cam, etc., and the influence of the frictional force by the aperture blade This shows that the aperture blade has moved to the design center value.

"Gear (0) + Friction (-)"
As a result of driving from the N-1 step to the N step, when the driving step position of the stepping motor is the N step, the aperture blade moves to the design center value regardless of the backlash of the gear and the cam, etc., and the influence of the frictional force by the aperture blade This indicates that the aperture blade has moved a little due to the large.

"Gear (-) + Friction (-)"
As a result of driving from the N-1 step to the N step, when the driving step position of the stepping motor is the N step, the aperture blade moves slightly below the design center value due to the backlash of the gear and the cam, and the frictional force by the aperture blade is reduced. It shows that the aperture blade has moved a little due to the large influence.

  Next, in FIG. 14, line segment aa ′, line segment bb ′, line segment cc ′, line segment dd ′, and line segment ee ′ are N step, N + 1 step, and N + 2 respectively. The position in the step is shifted from the design center value by gear (+) + friction (+), gear (0) + friction (+), gear (0) + friction (0), gear (0) + friction (− ), And the position of the aperture blade which is gear (−) + friction (−).

  Therefore, the line segment cc ′ indicates the position of the assumed diaphragm blade, the line segment aa ′ indicates the position when the diaphragm blade is moved more due to the friction of the diaphragm blade and the backlash of the gear and the cam, The line segment bb 'indicates the position when there is no influence of play such as gears and cams due to the friction of the diaphragm blades, and the line segment dd' moves less due to the friction of the diaphragm blades. , The position when there is no influence of play such as gears and cams, and the line segment ee ′ shows the position when the movement is slightly caused by friction of the diaphragm blades and play of the gears and cams.

  When the position P1 in FIG. 14 is reached, if the drive is performed as it is, the diaphragm blades move along the line segment a-a '. Therefore, by driving at a reduced speed as shown in FIG. 13B, the influence of friction such as the diaphragm blades is reduced, and the backlash of gears and cams is also clogged, so that the position P2 at N + 1 step and the position P3 at N + 2. It can be seen that it is close to the design center value. As a result, the side length ratio is improved, and the shape of the aperture blade becomes close to a circle.

  When the position P4 in FIG. 14 is reached, the diaphragm blades move along the line segment cc ′ without being affected by the friction of the gears, cams, etc. In step N + 1, position P5 is reached, and in position N + 2, position P6 is reached. Similarly, as shown in FIG. 13B, driving at a reduced speed is performed.

  When the position P7 in FIG. 14 is reached, if the drive is performed as it is, the diaphragm blades move along the line segment e-e '. Therefore, by driving at a reduced speed as shown in FIG. 13B, the influence of the friction of the diaphragm blades or the like is reduced, and the position P8 is reached in the N + 1 step, the position P9 is set in N + 2, and the design center value may be approached. I understand. Therefore, the side length ratio is improved, and the shape of the aperture blade becomes nearly circular.

  Here, since the backlash of gears and cams is not easily clogged because the effect is only due to deceleration, the amount of improvement of backlashes such as gears and cams is not included.

  In this way, when the diaphragm blades are stopped at the target position, the lens control means 11 is based on the signal from the camera control means 31 at a speed at which the stop position change of the diaphragm blades becomes small at the position before the stop. By controlling the control circuit 5, it is possible to reduce the variation in the stop position of the aperture blade, thereby improving the side length ratio.

  Next, the operation on the camera body side in this embodiment will be described along the flowchart of the main routine of the camera shown in FIG.

  The operation starts from step # 100. First, in step # 101, the lens detector 39 confirms whether a lens is attached. When mounting is detected, the process proceeds to step # 102 where ID code data is received and the lens type and characteristics of the mounted lens are confirmed. In the next step # 103, it is detected whether or not the switch SW1 is turned on. As a result, if the switch SW1 is ON, the process proceeds to step # 104.

  Proceeding to step # 104, if the image blur correction lens G2 is fixed, the fixing mechanism 18 transmits a command to drive the fixation release, and a command to move the image blur correction lens G2 in the lens barrel 1 to the initial position. And the image blur correction lens G2 is moved to the initial position near the center. In the next step # 105, a photometric operation is performed according to the AE optical data of the lens mounted in the lens or the camera body and the output of the photometric element 29. Subsequently, in step # 106, similarly, the lens control CPU 11 on the lens side is communicated according to the optical data for AF of the lens and the output from the focus detection element 30, and the focus lens G1 in the lens barrel 1 is driven. Perform the distance measuring operation.

  In the next step # 107, it is detected whether or not the switch SW2 is turned on. If not, the process returns to step # 103. On the other hand, if it is ON, the process proceeds to step # 108, communicates with the lens control CPU 11 in accordance with the photometry result in step # 105, and moves the aperture 2 to the set value as described above. In step # 109, the focal plane shutter 26 is opened by the shutter drive circuit 27. Subsequently, in step # 110, since the image sensor 41 is exposed, image data is acquired. Image data is acquired a plurality of times at a certain time during exposure to obtain image blur data.

  In the next step # 111, it is determined whether or not image blur correction is necessary. If it is not necessary, the process proceeds immediately to step # 113. If image blur correction is necessary, the process proceeds to step # 112, and the lens control CPU11. And the image blur correction lens G2 is driven. Then, the process proceeds to step # 113.

  In step # 113, the focal plane shutter 26 is closed by the shutter drive circuit 27 after the necessary exposure time has elapsed. In the next step # 114, communication is performed with the lens control CPU 11, and the image blur correction lens G2 is driven to the initial position. Subsequently, in step # 115, lens information and image processing data at the zoom position and focus position during the release are received, and in the next step # 116, image processing is performed using the lens image processing data obtained by communication. To record the image data as described above.

  In step # 117, it is checked whether or not the non-volatile memory has an unrecorded capacity. If there is, the process returns to step # 103. On the other hand, if there is no, the process proceeds to Step # 118, where a command to move the image blur correction lens G2 in the lens barrel 1 to the initial position is transmitted, and the image blur correction lens G2 is moved to the initial position near the center and fixed. The mechanism 18 transmits a fixed driving command to fix the image blur correction lens G2. In the next step # 119, the fact that there is no recording capacity is displayed on a display unit (not shown), and the main flow is terminated in step # 120.

  Next, the operation on the lens side that receives a command from the camera body through communication as described above will be described with reference to the flowchart shown in FIG.

  When receiving a command from the camera body by communication, the lens control CPU 11 on the lens side starts the operation from step # 201, and analyzes the command from the camera body in step # 202 and subsequent steps.

  First, in step # 202, an ID code data reception request command indicating whether or not the command from the camera body is the command in step # 102, that is, the lens type / characteristics such as the presence / absence of a lens image blur correction function. If so, the process proceeds to step # 203 to transmit the ID code data to the camera as described above. Thereafter, the process returns to step # 202.

  If it is determined in step # 202 that the lens command is not an ID code data reception request command, the process proceeds to step # 204. Here, it is determined whether or not the command from the camera body is a command in step # 115, that is, whether or not it indicates an optical data reception request command for image processing. If so, the process proceeds to step # 205. Then, the optical data for image processing is transmitted to the camera. Thereafter, the process returns to step # 202.

  If it is determined in step # 204 that the command is not an image processing optical data reception request command, the process proceeds to step # 206. Here, it is determined whether or not the command from the camera body is a command in step # 106, that is, whether or not it is an AF optical data reception request command. If so, the process proceeds to step # 207, As described above, the optical data for AF is transmitted to the camera. Thereafter, the process returns to step # 202.

  If it is determined in step # 206 that the command is not an optical data reception request for AF, the process proceeds to step # 208. Here, it is determined whether or not the command from the camera body is the command in step # 105, that is, whether or not it is an AE optical data reception request command. If so, the process proceeds to step # 209, and Thus, the AE optical data is transmitted to the camera. Thereafter, the process returns to step # 202.

  If it is determined in step # 208 that the command is not an AE optical data reception request, the process proceeds to step # 210. Here, it is determined whether or not the command from the camera body is the command in steps # 104, # 112, # 114 and # 118, that is, whether or not it is an IS optical data reception request command. Proceeding to step # 211, the optical data for IS is transmitted to the camera as described above. Thereafter, the process returns to step # 202.

  If it is determined in step # 210 that the command is not an optical data reception request for IS, the process proceeds to step # 212. Here, it is determined whether or not the command from the camera body is the command of step # 106, that is, whether or not it is a focus drive command. If so, the process proceeds to step # 213, and as described above, from the camera body. The focus lens G1 is driven by a command command for the amount and direction of movement of the focus lens G1. Thereafter, the process returns to step # 202.

  If it is determined in step # 212 that the command is not a focus drive command, the process proceeds to step # 214. Here, it is determined whether or not it is a drive command for the diaphragm 2. If so, the process proceeds to step # 215, and the diaphragm 2 is driven by a command for the diaphragm amount and the diaphragm direction of the diaphragm 2 from the camera body. To do. Thereafter, the process returns to step # 202.

  If it is determined in step # 214 that the driving command is not for the diaphragm 2, the process proceeds to step # 216. Here, it is determined whether or not the command from the camera body is the command of steps # 104, # 112, # 114 and # 118, that is, whether or not it is an image blur correction lens driving command. Proceeding to step # 217, as described above, the image blur correction lens is driven according to the command of the movement amount and movement direction of the image blur correction lens from the camera body. Thereafter, the process returns to step # 202.

  If it is determined in step # 216 that the command is not an image blur correction lens drive command, the process proceeds to step # 218. Here, it is determined whether or not the command from the camera body is the command in steps # 104 and # 118, that is, whether or not it is an image blur correction lens fixing mechanism drive command. If so, the process proceeds to step # 219. As described above, the image blur correction lens fixing mechanism is driven by the command command for fixing and releasing the fixing mechanism driving of the image blur correction lens from the camera body. Thereafter, the process returns to step # 202.

  If it is determined in step # 218 that the command is not an image blur correction lens fixing mechanism drive command, the process proceeds to step # 220. And here, if it is other instructions, for example, other optical information request instructions, the optical information is transmitted to the camera body. Thereafter, the process returns to step # 202.

  As described above, in this embodiment, when the diaphragm blade is stopped at the target position as described above, the lens controller 11 changes the stop position of the diaphragm blade at the position before the stop based on the signal from the camera controller 31. By controlling the aperture control circuit 5 at a speed at which the aperture becomes smaller, variations in the stop position of the aperture blades can be reduced, thereby improving the side length ratio.

  Next, a second embodiment of the present invention will be described.

  In this embodiment, the difference from the first embodiment described above is that when the diaphragm blade is stopped at the target position, the lens control means 11 once decelerates the speed of the diaphragm blade based on the signal from the camera control means 31, After that, the aperture control circuit 5 is controlled to stop after accelerating. Other configurations and optical actions are substantially the same as those in the first embodiment, and the same effects are obtained.

  That is, in Embodiment 1 described above, the aperture opening shape is made close to a circular shape by slowing down the speed before the target stop position of the aperture blade, but in this embodiment, in order to further improve the effect, When stopping at the target position, the speed of the diaphragm blades is once decelerated, then accelerated, and then stopped. As shown in FIG. 14, the positions of the aperture blades vary due to backlashes such as gears and cams. By accelerating after decelerating, positive acceleration is applied to the drive system, and the effect of backlash can be increased. Therefore, it is possible to reduce variations in position due to backlashes such as gears and cams.

  FIG. 17 shows the state of acceleration / deceleration of the diaphragm blades of this embodiment. In FIG. 17, the vertical axis represents the speed of the aperture blade, and the horizontal axis represents the position of the aperture blade.

  Also in the present embodiment, as in the first embodiment, in order to reduce variation in the stop position, the position of the aperture blade to be accelerated is set to be two steps or more before the stepping motor at the target stop position.

  Next, similarly to FIG. 14 of the first embodiment, FIG. 18 shows the relationship between the stop position of the diaphragm blade and the stepping motor driving step due to friction between the backlash of the gear, the cam, and the diaphragm blade.

  In the case of the position P11 in FIG. 18, if the drive is performed as it is, the diaphragm blades move along the line segment a-a '. Therefore, as shown in FIG. 17, acceleration before stopping stops the influence of the friction of the diaphragm blades and the like as compared with the example of FIG. 14, and the backlash of the gear and the cam is also clogged. It can be seen that the position is P13 and is close to the design center value. As a result, the side length ratio is improved, and the shape of the diaphragm blade becomes close to a circle.

  Positions P14, P15, and P16 in FIG. 18 are the same as P4, P5, and P6 in FIG.

  In the case of the position P17 in FIG. 18, if the drive is performed as it is, the diaphragm blades move along the line segment e-e '. Therefore, as shown in FIG. 17, acceleration before stopping stops the influence of the friction of the diaphragm blades, etc., compared to the example of FIG. 14, and the backlash of gears and cams is also clogged. It becomes P19, and it can be seen that it is close to the design center value. Therefore, the side length ratio is improved, and the shape of the aperture blade becomes nearly circular. By accelerating, backlashes such as gears and cams are also clogged.

  As described above, in this embodiment, when the diaphragm blades are stopped at the target position as described above, the lens control means 11 once decelerates the speed of the diaphragm blades based on the signal from the camera control means 31 and then accelerates. By controlling the diaphragm control circuit 5 so as to stop later, the variation in the position of the diaphragm blades can be reduced, thereby improving the side length ratio.

  Next, a third embodiment of the present invention will be described.

  In this embodiment, the difference from the second embodiment is that when the diaphragm blade is stopped at the target position, the lens control means 11 temporarily stops the diaphragm blade near the target position based on the signal from the camera control means 31. Then, the diaphragm control circuit 5 is controlled so as to stop at the target position after driving. Other configurations and optical actions are substantially the same as those in the second embodiment, and the same effects are obtained.

  That is, in the second embodiment, the speed is reduced and then accelerated and decelerated before the stop stop target stop position. However, in this embodiment, when the stop blade is stopped at the target position in order to further improve the effect. The diaphragm blades are temporarily stopped in the vicinity of the target position, and then driven to stop at the target position. By stopping once in this way, the variation speed of the aperture blade position within the play of the gear and the cam can be reduced to zero, so that the friction of the aperture blade and the influence of the play of the gear and the cam can be affected with good reproducibility. It can be reduced.

  FIG. 19 shows the state of acceleration / deceleration of the diaphragm blades of this embodiment. In FIG. 19, the vertical axis represents the speed of the diaphragm blades, and the horizontal axis represents the position of the diaphragm blades.

  Also in the present embodiment, as in the second embodiment described above, in order to reduce the variation in the stop position, the position of the stop blade to be stopped is set to be two steps or more before the stepping motor at the target stop position.

  Next, similarly to FIG. 14 of the first embodiment, FIG. 20 shows the relationship between the stop position of the diaphragm blades due to friction between the gears and cams and the friction of the diaphragm blades and the driving step of the stepping motor.

  In the case of the position P21 in FIG. 20, if the driving is performed as it is, the diaphragm blades move along the line segment a-a '. Therefore, as shown in FIG. 19, after stopping and accelerating and eliminating the speed variation, the influence of the friction of the diaphragm blades and the like is reduced compared to the example of FIG. , N + 2, the position is P23, which is almost the design center value. As a result, the side length ratio is improved, and the shape of the diaphragm blade becomes close to a circle.

  Positions P24, P25, and P26 in FIG. 20 are the same as P4, P5, and P6 in FIG.

  In the case of the position P27 in FIG. 20, if the drive is performed as it is, the diaphragm blades move along the line segment e-e '. Therefore, as shown in FIG. 19, by stopping and then accelerating, the speed variation is eliminated, so that the influence of the friction of the diaphragm blades and the like is reduced as compared with the example of FIG. It becomes P28, and in N + 2 step, it becomes a position P29, and it can be seen that it is close to the design center value. Therefore, the side length ratio is improved, and the shape of the aperture blade becomes nearly circular. By accelerating, backlashes such as gears and cams are also clogged.

  As described above, in this embodiment, when the diaphragm blade is stopped at the target position as described above, the lens control unit 11 temporarily stops the diaphragm blade near the target position based on the signal from the camera control unit 31, and thereafter. By controlling the aperture control circuit 5 so as to stop at the target position after being driven, variations in the position of the aperture blades can be reduced, thereby improving the side length ratio.

  Next, a fourth embodiment of the present invention will be described.

  The present embodiment differs from the first, second, and third embodiments in that the lens control CPU 11 is provided with switching means for switching the driving method of the diaphragm blades during observation (when checking the depth of field) and during photographing. When there is a signal from the depth of field confirmation means (depth of field confirmation switch) 55 during observation, the lens control means 11 stops the diaphragm blade at the target position based on the signal from the camera control means 31. When stopping, the stop control circuit 5 is controlled at a speed at which the stop position change of the stop blade becomes small at the position before the stop, or the speed of the stop blade is once decelerated and then accelerated and then stopped. In addition, the aperture control circuit 5 is controlled, or the aperture blade is temporarily stopped in the vicinity of the target position, and then the aperture control circuit 5 is controlled so that it is driven and then stopped at the target position. That. Other configurations and optical actions are substantially the same as those of the first, second, and third embodiments, thereby obtaining the same effects.

  That is, when the diaphragm blades 73 are driven as in the first, second, and third embodiments, it takes time. On the other hand, there is no problem with the aperture diameter accuracy, and the variation in the stop position of the aperture blade is more noticeable when the depth-of-field confirmation switch 55 is operated and the lens is looked into from the object side rather than the aperture blur shape on the photographed image. ing.

  Therefore, in this embodiment, the lens control means 11 is based on the signal from the camera control means 31 only when the depth of field confirmation switch 55 is operated during observation (when confirming the depth of field) as described above. When stopping at the target position, the stop control circuit 5 is controlled at a speed at which the stop position change of the stop blade becomes small at the position before the stop, or the speed of the stop blade is once decelerated and then accelerated. The aperture control circuit 5 is controlled so as to stop, or the aperture blade is temporarily stopped near the target position, and then the aperture control circuit 5 is controlled so as to stop after driving. .

  FIG. 21 is a flowchart showing the operation on the camera body side in this embodiment, and FIG. 22 is a flowchart showing the operation on the lens side in this embodiment.

  The flowchart shown in FIG. 21 corresponds to the flowchart shown in FIG. 15, and step # 301 and step # 302 are added between step # 102 and step # 103 shown in FIG. 15, and step # 108 shown in FIG. This is changed to step # 303. Here, different steps will be described.

  That is, in step # 301 in this flowchart, it is detected whether or not the depth-of-field confirmation switch 55 has been operated. To communicate. If not, the process proceeds to step # 103.

  In step # 303, in order to reduce the release time lag, a command for performing high-speed aperture driving is communicated to the lens.

  The flowchart shown in FIG. 22 corresponds to the flowchart shown in FIG. 16, and steps # 401 to # 403 are added between step # 214 and step # 202 shown in FIG. Here, different steps will be described.

  That is, at step # 401 in this flowchart, whether the aperture drive command is the command at step # 302 (command for performing aperture blade stop position improvement aperture drive) or the command at step # 303 (command for performing high-speed aperture drive). If YES in step # 302, the flow advances to step # 402, and the diaphragm blade stop position improving diaphragm drive described in the first, second, and third embodiments is performed. If the instruction is step # 303, the process proceeds to step # 403 to perform high-speed aperture driving.

  Thus, in the present embodiment, as described above, the lens controller 11 controls the aperture based on the signal from the camera controller 31 only when operating the depth of field confirmation switch 55 during observation (when confirming the depth of field). When stopping the blades at the target position, the stop control circuit 5 is controlled at a speed at which the stop position change of the diaphragm blades becomes small at the position before the stop, or the speed of the diaphragm blades is temporarily reduced and then accelerated. By controlling the aperture control circuit 5 so as to stop later, or by controlling the aperture control circuit 5 so that the aperture blade is temporarily stopped in the vicinity of the target position and then stopped at the target position after being driven. Variations in the position of the aperture blades can be reduced, thereby improving the side length ratio.

  Next, a fifth embodiment of the present invention will be described.

  The present embodiment differs from the first, second, and third embodiments in that the lens control CPU 11 is provided with switching means for switching the driving method of the diaphragm blades according to the setting mode from the shooting mode setting means for setting the shooting mode. When the setting mode of the mode setting means is a specific shooting mode, when the lens control means 11 stops the aperture blade at the target position based on a signal from the camera control means 31, the aperture is stopped at the position before the stop. The aperture control circuit 5 is controlled at a speed at which the change in the stop position of the blade becomes small, or the aperture control circuit 5 is controlled so as to stop after the speed of the aperture blade is once decelerated and then accelerated, or That is, the diaphragm control circuit 5 is controlled so that the diaphragm blades are temporarily stopped in the vicinity of the target position and then driven to stop at the target position.Other configurations and optical actions are substantially the same as those of the first, second, and third embodiments, thereby obtaining the same effects.

  That is, when the diaphragm blades 73 are driven as in the first, second, and third embodiments, it takes time. Depending on the shooting mode, the time may be a problem.

  Therefore, in this embodiment, when the lens control unit 11 stops the stop blade at the target position based on the signal from the camera control unit 31 in a specific shooting mode, the stop of the stop blade is stopped at the position before the stop. The aperture control circuit 5 is controlled at a speed at which the position change becomes small, or the speed of the aperture blade is once decelerated and then accelerated, and then the aperture control circuit 5 is controlled to stop, or the aperture blade is moved to the target position. The aperture control circuit 5 is controlled so as to stop once in the vicinity and then stop at the target position after driving.

  The specific shooting mode is a shooting mode in which shooting time is not prioritized.

  FIG. 23 is a flowchart showing the operation of the present embodiment on the camera body side.

  The flowchart shown in FIG. 23 corresponds to the flowchart shown in FIG. 15, and steps # 501 to # 503 are added between step # 107 and step # 109 shown in FIG. Here, different steps will be described.

  That is, in step # 501 in this flowchart, it is detected whether or not the operation unit 38 for setting the camera shooting mode or the like has been operated in a speed priority shooting mode such as a sports mode or a continuous shooting mode. Proceeding to step # 502, in order to reduce the release time lag, a command for performing high-speed aperture driving is communicated to the lens. If the shutter speed is high, the speed priority shooting mode is set and the process proceeds to step # 502.

  If it is not operated, the process proceeds to step # 503. In step # 503, since the speed is not prioritized or the shutter speed is low, a command for performing aperture blade stop position improvement aperture drive is communicated to the lens.

  The lens operation in the present embodiment is the same as the flowchart shown in FIG.

  That is, in step # 401 shown in FIG. 22, whether the aperture drive command is the command of step # 503 (command to perform aperture blade stop position improvement aperture drive) or the command of step # 502 (command to perform high-speed aperture drive) If it is the command of step # 503, the process proceeds to step # 402, and the diaphragm blade stop position improving diaphragm drive shown in the first, second, and third embodiments is performed. If the instruction is step # 502, the process proceeds to step # 403 to perform high-speed aperture driving.

  As described above, in this embodiment, when the speed is not prioritized in the continuous shooting equal speed priority mode as described above, the lens control unit 11 stops the aperture blade at the target position based on the signal from the camera control unit 31. In addition, the aperture control circuit 5 is controlled at a speed at which the stop position change of the diaphragm blades becomes small at the position before the stop, or the diaphragm blade speed is once decelerated and then accelerated and then stopped. Control of the control circuit 5 or stopping the diaphragm blades near the target position, and then driving the diaphragm blades to stop at the target position, thereby reducing variations in the position of the diaphragm blades. This can improve the side length ratio.

  Next, a sixth embodiment of the present invention will be described.

  The present embodiment differs from the first, second and third embodiments in that the lens control CPU 11 is provided with switching means for switching the driving method of the diaphragm blades according to the set value from the diaphragm stage number setting means for setting the diaphragm stage number. When the setting value of the stage number setting unit is larger than a certain value, the lens control unit 11 is configured to stop the stop blade at the target position based on the signal from the camera control unit 31 at the position before the stop. Control the diaphragm control circuit 5 at a speed at which the stop position change of the diaphragm blades becomes small, or control the diaphragm control circuit 5 so as to stop after the speed of the diaphragm blades is once decelerated and then accelerated, or That is, the diaphragm control circuit 5 is controlled so that the diaphragm blades are temporarily stopped in the vicinity of the target position and then driven to stop at the target position. Other configurations and optical actions are substantially the same as those of the first, second, and third embodiments, thereby obtaining the same effects.

  That is, when the diaphragm blades 73 are driven as in the first, second, and third embodiments, it takes time. On the other hand, variations in the position of the diaphragm blades are easily noticeable when the number of aperture stages is large (the aperture diameter is small). For example, when the aperture stage number is from open to 2-3 aperture stages, the deterioration of the side length ratio is small, and the aperture stage number is 3-4. Although there is a difference depending on the shape of the aperture blade, a certain value is set to n = 3 to 4 in terms of the number of apertures.

Therefore, in this embodiment, when the setting value of the aperture stage number setting unit is larger than a certain value, the lens control unit 11 stops the aperture blade at the target position based on the signal from the camera control unit 31. Aperture control is performed so that the stop control circuit 5 is controlled at a speed at which the stop position change of the aperture blade becomes small at the position before the stop, or the speed of the aperture blade is once decelerated and then accelerated. The aperture control circuit 5 is controlled such that the circuit 5 is controlled, or the aperture blades are temporarily stopped near the target position and then driven to stop at the target position.

  FIG. 24 is a flowchart showing the operation on the lens side of this embodiment. The flowchart shown in FIG. 24 corresponds to the flowchart shown in FIG. 16, and steps # 601 to # 603 are added between step # 214 and step # 202 shown in FIG. Here, different steps will be described.

  That is, in step # 601 in this flowchart, it is determined whether or not the number of drive stages in the aperture drive command from the camera body is n or more. If there are more than n stages, the variation in the diaphragm blade position is conspicuous, and therefore the process proceeds to step # 602, and the diaphragm blade stop position improving diaphragm drive shown in the first, second, and third embodiments is performed. If the number of driving stages is less than n, the process proceeds to step # 603 to perform high-speed aperture driving.

  As described above, in this embodiment, when the set value of the aperture stage number setting unit is larger than a certain value as described above, the lens control unit 11 stops the aperture blade at the target position based on the signal from the camera control unit 31. When stopping, the stop control circuit 5 is controlled at a speed at which the stop position change of the stop blade becomes small at the position before the stop, or the speed of the stop blade is once decelerated and then accelerated and then stopped. In addition, by controlling the aperture control circuit 5 or by controlling the aperture control circuit 5 so that the aperture blade is temporarily stopped in the vicinity of the target position and then driven to stop at the target position. Can be reduced, thereby improving the side length ratio.

  In each embodiment, the description has been given of the camera system configured with the interchangeable lens that can be attached to and detached from the camera body. However, the present invention is not limited to this. For example, the present invention may be applied to a camera system in which the lens is integrated with the camera body. Needless to say, there are similar actions and effects.

1 is a configuration diagram of a main part of a camera system according to Embodiment 1 of the present invention. Timing chart showing communication between the lens of FIG. 1 and the camera body An exploded perspective view of a stepping motor as an electromagnetic drive motor Cross-sectional view of main parts of stepping motor Stepper motor assembly drawing The figure explaining the drive method of the stepping motor at the time of performing 1-2 phase drive Perspective view of main part for assembling diaphragm device Sectional view of the main part of an electromagnetically driven aperture device equipped with an electromagnetically driven motor A Partial plan view of electromagnetic drive diaphragm The figure which shows the position of the diaphragm blade where the side length ratio is good The figure which shows the position of the diaphragm blade where side length ratio deteriorated extremely Diagram showing the relationship between the position and speed of the diaphragm blades near the stop position of the diaphragm blades The figure which shows the state of the acceleration deceleration of the aperture blade which concerns on a prior art example and Example 1 of this invention. The figure which shows the relationship between the stop position of a diaphragm blade | wing by friction, such as backlash of a gear, a cam, etc., and a diaphragm blade | wing according to Example 1 of this invention, and the drive step of a stepping motor 7 is a flowchart showing the operation on the camera body side according to first to third embodiments of the present invention. The flowchart which shows the operation | movement by the side of the lens which concerns on Examples 1-3 of this invention. The figure which shows the state of the acceleration deceleration of the aperture blade which concerns on Example 2 of this invention. The figure which shows the relationship between the drive position of the stepping motor and the stop position of a diaphragm blade | wing by friction, such as backlash of a gear, a cam, etc., and a diaphragm blade | wing according to Example 2 of this invention The figure which shows the state of the acceleration deceleration of the aperture blade which concerns on Example 3 of this invention. The figure which shows the relationship between the drive position of the stepping motor and the stop position of a diaphragm blade | wing by friction, such as backlash, such as a gear, a cam, and diaphragm blades concerning Example 3 of this invention 10 is a flowchart showing the operation on the camera body side according to the fourth embodiment of the present invention. 9 is a flowchart showing the operation on the lens side according to Embodiment 4 of the present invention. 9 is a flowchart showing the operation on the camera body side according to the fifth embodiment of the present invention. Flowchart showing the operation on the lens side according to Embodiment 6 of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens barrel 1a Image pick-up optical system 2 Light-shielding means 3 Drive means 5 Aperture control means 11 Lens control means (lens control CPU)
31 Camera control means (camera control CPU)
38 Operation unit for setting a shooting mode of the camera 41 Non-destructive image pickup device such as a CMOS sensor 43 CDS / AGC circuit 47 Camera DSP
49 Display 55 Depth of field confirmation switch

Claims (39)

In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. A camera characterized by controlling the means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. The camera according to claim 1, wherein the aperture control unit is controlled at a speed at which a change in the stop position of the light shielding unit becomes small.   When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, 2. The camera according to claim 1, wherein the diaphragm control unit is controlled at a speed at which a change in a stop position of the light shielding unit is reduced.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit is configured to stop the light blocking unit at a target position based on a signal from the camera control unit. The camera according to claim 1, wherein the aperture control unit is controlled at a speed at which a change in the stop position of the light shielding unit becomes small.   The camera according to claim 4, wherein the specific shooting mode is a shooting mode in which shooting time is not prioritized. In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. A camera characterized by controlling a control means.   When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. 7. The camera according to claim 6, wherein the aperture control means is controlled so as to decelerate the lens, and then accelerate and then stop.   When the set value from the aperture step number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The camera according to claim 6, wherein the aperture control unit is controlled so as to stop after the speed is once decelerated and then accelerated.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit determines the speed of the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. 7. The camera according to claim 6, wherein the aperture control means is controlled so as to decelerate the lens, and then accelerate and then stop.   The camera according to claim 9, wherein the specific shooting mode is a shooting mode in which shooting time is not prioritized. In a camera having a camera control means for communicating with a lens,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. As described above, the camera controls the aperture control means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. The camera according to claim 11, wherein the diaphragm control unit is controlled so as to temporarily stop near a position, and then drive to stop at a target position.   When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. The camera according to claim 11, wherein the diaphragm control unit is controlled so as to stop once near the target position, and then stop at the target position after driving.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit sets the light blocking unit to the target position when stopping the light blocking unit at a target position based on a signal from the camera control unit. The camera according to claim 11, wherein the diaphragm control unit is controlled so as to temporarily stop near a position, and then drive to stop at a target position.   The camera according to claim 14, wherein the specific shooting mode is set to a shooting mode in which shooting time is not prioritized. In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. A lens characterized by controlling the means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. The lens according to claim 16, wherein the aperture control unit is controlled at a speed at which a change in the stop position of the light shielding unit is reduced.   When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, The lens according to claim 16, wherein the aperture control unit is controlled at a speed at which a change in the stop position of the light shielding unit becomes small. In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. A lens characterized by controlling a control means.   When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. 21. The lens according to claim 19, wherein the aperture control means is controlled so as to decelerate the lens once, then accelerate, and then stop.   When the set value from the aperture step number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. The lens according to claim 19, wherein the aperture control unit is controlled to stop after the speed is once decelerated and then accelerated. In a lens having connection means capable of communicating with a camera having camera control means,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. As described above, the lens is characterized by controlling the aperture control means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. 23. The lens according to claim 22, wherein the aperture control unit is controlled so as to stop once in the vicinity of the position, and then stop at the target position after driving.   When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. 23. The lens according to claim 22, wherein the aperture control unit is controlled so as to stop once near the target position, and then stop at the target position after driving. In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means controls the aperture at a speed at which the change of the stop position of the light shielding means becomes small at the position before the stop based on a signal from the camera control means. A camera characterized by controlling the means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to stop the light shielding unit at a target position based on the signal from the camera control unit. 26. The camera system according to claim 25, wherein the diaphragm control unit is controlled at a speed at which a change in the stop position of the light shielding unit is reduced.   When the lens control means stops the light shielding means at the target position based on the signal from the camera control means when the set value from the aperture stage number setting means is larger than a certain value, 26. The camera system according to claim 25, wherein the diaphragm control unit is controlled at a speed at which a change in the stop position of the light shielding unit is reduced.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit is configured to stop the light blocking unit at a target position based on a signal from the camera control unit. 26. The camera system according to claim 25, wherein the diaphragm control unit is controlled at a speed at which a change in the stop position of the light shielding unit is reduced.   29. The camera system according to claim 28, wherein the specific shooting mode is set to a shooting mode in which shooting time is not prioritized. In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light-shielding means at the target position, the lens control means reduces the speed of the light-shielding means once based on a signal from the camera control means, and then accelerates and then stops the aperture. A camera characterized by controlling a control means.   When there is a signal from the depth of field confirmation means during observation, the lens control means is configured to stop the light shielding means at a target position based on the signal from the camera control means. 31. The camera system according to claim 30, wherein the diaphragm control means is controlled so as to decelerate and then stop after accelerating.   When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit is configured to stop the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. 31. The camera system according to claim 30, wherein the aperture control unit is controlled so that the speed is once decelerated and then accelerated and then stopped.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit determines the speed of the light blocking unit when stopping the light blocking unit at a target position based on a signal from the camera control unit. 31. The camera system according to claim 30, wherein the aperture control means is controlled so as to decelerate and then stop after accelerating.   The camera system according to claim 33, wherein the specific shooting mode is a shooting mode in which shooting time is not given priority. In a camera system having a camera having a camera control means and a lens, and having a connection means capable of communicating between the two,
The lens includes a light shielding unit that changes a diaphragm aperture value of the photographing optical system, a driving unit that drives the light shielding unit, a diaphragm control unit that controls an open / close state of the light shielding unit via the driving unit, and the diaphragm Lens control means for controlling the control means,
When stopping the light shielding means at the target position, the lens control means temporarily stops the light shielding means in the vicinity of the target position based on a signal from the camera control means, and then drives the lens and then stops at the target position. In this way, the camera controls the aperture control means.   When there is a signal from the depth-of-field confirmation unit during observation, the lens control unit is configured to target the light shielding unit when stopping the light shielding unit at a target position based on the signal from the camera control unit. 36. The camera system according to claim 35, wherein the diaphragm control means is controlled so as to stop once in the vicinity of the position, and thereafter drive to stop at the target position.   When the set value from the aperture stage number setting unit is larger than a certain value, the lens control unit sets the light blocking unit to stop the light blocking unit at a target position based on a signal from the camera control unit. 36. The camera system according to claim 35, wherein the diaphragm control means is controlled so as to stop once near the target position, and then stop after reaching the target position.   When the setting mode from the shooting mode setting unit is a specific shooting mode, the lens control unit sets the light blocking unit to the target position when stopping the light blocking unit at a target position based on a signal from the camera control unit. 39. The camera system according to claim 38, wherein the diaphragm control means is controlled so as to stop once in the vicinity of the position, and thereafter drive to stop at the target position.   The camera system according to claim 38, wherein the specific photographing mode is a photographing mode in which photographing time is not prioritized.