JP2018005130A - Interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interchangeable lens that prevents an image with a lot of aberration unintended by a photographer from being taken when an aberration correction-enabled lens is attached to an aberration correction-disabled camera.SOLUTION: An interchangeable lens detachably attached to a camera body includes a communication unit for communicating with a camera and camera identification means for finding whether an attached camera is an aberration correction-enabled camera. When the camera identification means identifies the attached camera as an aberration correction-disabled camera, the interchangeable lens falls into a photographing impossible state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interchangeable lens compatible with aberration correction.

  In general, the lens deteriorates images such as chromatic aberration of magnification, which causes color blur at the edge of the subject image at the periphery of the screen, and distortion that appears to bulge, dent, or distort outward from the center of the screen. There is an aberration that causes it to occur.

  Conventionally, optical design has been used to reduce aberrations, but this has led to increased costs and larger lenses.

  Therefore, in recent years, a camera system having an aberration correction function for electrically correcting these aberrations after photographing them has been proposed.

  Japanese Patent Application Laid-Open No. 2004-228561 includes a calculation unit that calculates a correction value for correcting generated image data based on optical data sent from a lens to a camera body, so that aberration correction can be performed inside the camera. It has been proposed.

  Patent Document 2 proposes performing appropriate aberration correction according to various situations by sending appropriate data to the camera body in accordance with usage, conditions, and camera characteristics.

JP 2010-109667 A JP 2008-278463 A

  In both Patent Documents 1 and 2, an appropriate image is obtained by the camera performing appropriate correction based on data sent from the lens to the camera. However, when an interchangeable lens designed on the assumption that the photographer corrects aberrations is attached to a camera that does not have an aberration correction function, it will not be corrected properly, resulting in an image with many aberrations. May be taken unintentionally.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an interchangeable lens that prevents an image with a large amount of aberration not intended by the photographer from being taken when the lens is attached to an aberration correction-incompatible camera. .

In order to achieve the above object, an interchangeable lens according to the present invention includes:
An interchangeable lens that can be attached to and detached from the camera body, and that identifies a communication unit that communicates with the camera and a camera identification unit that identifies whether or not the attached camera is an aberration correction compatible camera and a camera identification unit that identifies an aberration correction incompatible camera In this case, the photographing is disabled.

  According to the present invention, it is possible to provide an interchangeable lens that prevents an image having a large amount of aberration unintended by the photographer from being taken when the aberration correction compatible lens is attached to a camera that does not support aberration correction.

It is a flowchart which shows the process example when the aberration correction corresponding | compatible lens of Example 1 of this invention is mounted | worn with the camera. It is a system block diagram of an interchangeable lens and a camera body according to an embodiment of the present invention. 10 is a flowchart illustrating a processing example when the aberration correction compatible lens of Example 2 of the present invention is attached to a camera. It is the figure which showed the movement range of the focus by the Example of this invention, and the out-of-focus range example. It is the figure which showed the interchangeable lens of Example 3 of this invention. It is a flowchart which shows the example of a process when the aberration correction corresponding | compatible lens of Example 3 of this invention is mounted | worn with the camera.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  An electrical configuration of the camera system of the interchangeable lens 100 and the camera body 200 which is the optical apparatus of the present embodiment will be described with reference to FIG.

  Reference numeral 11 denotes a camera CPU constituted by a microcomputer. The camera CPU 11 controls the operation of each unit in the camera body 200. The camera CPU 11 communicates with the lens CPU 1 provided in the lens barrel 100 through the lens side contact 2 and the camera side contact 19 when the lens barrel 100 is mounted. The lens CPU 1 receives camera information from the camera CPU 11, and identifies whether the camera 200 mounted by the camera identification unit 3 is an aberration correction compatible camera. An aberration correction compatible camera is a camera provided with a function of electrically correcting various aberrations such as distortion and lateral chromatic aberration from an image obtained through the interchangeable lens 100.

  A power switch 12 that can be operated by a photographer is a switch for starting the camera CPU 11 and starting power supply to each actuator, sensor, and the like in the camera system. Reference numeral 13 denotes a release switch that can be operated by a photographer, and includes a first stroke switch (SW1) and a second stroke switch (SW2). A signal from the release switch 13 is input to the camera CPU 11. The camera CPU 11 enters a shooting preparation state in response to an ON signal input from the first stroke switch (SW1).

  In the shooting preparation state, measurement of subject brightness by the photometry unit 14 and focus detection by the focus detection unit 15 are performed. The camera CPU 11 calculates the aperture value of the aperture unit, the exposure amount of the image sensor (in the shutter speed), and the like based on the photometric result. Further, the camera CPU 11 drives the focus lens barrel to obtain a focus state for the subject based on focus information (defocus amount and defocus direction) that is a detection result of the focus state of the photographing optical system by the focus detection unit 15. Determine the amount (including drive direction). The drive amount information (focus lens drive amount information) is transmitted to the lens CPU 1. The lens CPU 1 controls the operation of each component of the interchangeable lens 100.

  Further, when the camera CPU 11 enters a predetermined shooting mode, the camera CPU 11 starts the shift driving of the IS group unit, that is, the control of the image stabilization operation. When an ON signal is input from the second stroke switch (SW2), the camera CPU 11 transmits an aperture drive command to the lens CPU 1 to set the aperture unit to the previously calculated aperture value. In addition, the camera CPU 11 transmits an exposure start command to the exposure unit 16 to perform a mirror retracting operation (not shown) and an opening operation of a shutter (not shown), and the imaging unit 17 including the imaging device performs photoelectric detection of the subject image. Conversion, that is, an exposure operation is performed.

  An imaging signal from the imaging unit 17 is converted into a digital signal by a signal processing unit in the camera CPU 11 and further subjected to various correction processes to be output as an image signal. The image signal (data) is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, or an optical disk in the image recording unit 18.

  Reference numeral 5 denotes an MF ring rotation detection unit, which includes a manual focus ring unit and its rotation detection unit. ZOOM ring rotation detection unit 6 includes a manual zoom ring and a sensor (not shown) that detects the rotation. Reference numeral 7 denotes an IS drive unit, which includes a drive actuator of an IS unit that performs a vibration isolation operation and a drive circuit thereof. A focus driving unit 9 performs focus driving of the focus barrel through a focus motor in accordance with focus lens drive amount information transmitted from the camera CPU 1.

  Reference numeral 8 denotes an electromagnetic aperture driving unit, which is controlled by the lens CPU 1 that has received an aperture driving command from the camera CPU 11 to operate the aperture unit in an aperture state corresponding to a specified aperture value. Reference numeral 10 denotes an angular velocity sensor mounted on the interchangeable lens 100 and connected to a printed circuit board. The angular velocity sensor 10 outputs to the lens CPU 1 angular velocity signals indicating the angular velocities of the vertical (pitch direction) shake and the lateral (yaw direction) shake that are the angular shake of the camera system. The lens CPU 1 integrates the angular velocity signals in the pitch direction and the yaw direction from the angular velocity sensor 10 electrically or mechanically, and the pitch direction shake amount and the yaw direction shake amount, which are displacement amounts in the respective directions (summarizing them). (Also referred to as angular deflection).

  Then, the lens CPU 1 controls the IS drive unit 7 based on the above-described combined displacement amount of the angular shake amount and the parallel shake amount to shift-drive the IS unit, thereby performing the angular shake correction and the parallel shake correction. In addition, the lens CPU 1 controls the focus driving unit 9 based on the focus shake amount to drive the focus lens barrel in the optical axis direction, thereby performing focus shake correction.

  Next, control of the interchangeable lens 100 and the camera 200 when the interchangeable lens 100 is attached to the camera 200 will be described with reference to FIG.

  First, when the power is turned on, communication processing is performed between the lens and the camera. When the communication establishment is confirmed, the camera ID is sent from the camera side to the lens (step S1).

  The camera identification unit 3 identifies whether the sent camera ID is an aberration correction compatible camera (step S2).

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is an aberration correction compatible camera (Yes in step S2), aberration correction data is sent from the lens 100 to the camera 200 (step S3).

  Next, it is inspected whether the first stroke switch (SW1) is ON (step S5).

  If the first stroke switch (SW1) is not ON (No in step S5), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5). When the first stroke switch (SW1) is ON (Yes in step S5), the photographing preparation state is entered (step S6).

  Next, it is inspected whether the second stroke switch (SW2) is ON (step S7).

  If the second stroke switch (SW2) is not ON (No in step S7), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5). If the second stroke switch (SW2) is ON (Yes in step S7), the exposure operation is started (step S8).

  Next, the image data obtained from the image sensor is subjected to various correction processes based on the aberration correction data obtained in step 3 (step S9).

  Next, the image data corrected in step S9 is recorded and stored in a storage medium (step S10).

  Thereafter, when the power is ON (Yes in step S11), the process returns to the step of checking whether the first stroke switch (SW1) is ON in step S5. If the power is OFF (No in step S11), the process ends.

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is a camera that does not support aberration correction (No in step S2), the lens CPU 1 issues a command to enter a shooting disabled state (step S4).

  The command to enter the imaging disabled state is to transmit a driving command for driving the focus barrel to a position outside the focusing range from the lens CPU 1 to the focus driving unit 9.

  With reference to FIG. 4, the movement of the focus barrel out of the focusing range will be described.

  FIG. 4 is a schematic diagram showing the movement range of the focus lens barrel at each zoom position. The horizontal axis is the subject distance, and the vertical axis is the zoom position. The moving range end on the subject side is an infinite position of WIDE, and the moving range end on the object side is a close position of TELE. A portion indicated by a solid line in FIG. 4 is a focus position at each zoom position, and a portion indicated by a broken line is a position outside the focus range. For example, the position moved further to the object side from the close end during WIDE, and the position moved further toward the subject side from the infinite end during TELE is a position outside the focusing range.

  The position outside the focus range is a range that is not used at each zoom position within the focus movement range, and a region outside the focus range is not separately provided outside the focus movement range. Therefore, the focus movement range is widened and the lens is not enlarged. Even if an ON signal is input from SW1, a drive command for driving the focus barrel out of the focus range is continuously transmitted to the focus drive unit 9, so that the focus is not achieved and photographing is impossible. Further, in the shooting disabled state, communication with the camera CPU may be simply turned off. As described above, when the aberration correction compatible lens is attached to the camera that does not support aberration correction, a photograph with many aberrations that are not corrected for aberrations is not mistakenly taken.

[Example 2]
Next, Embodiment 2 will be described with reference to FIGS.

  First, when the power is turned on, communication processing is performed between the lens and the camera. When the communication establishment is confirmed, the camera ID is sent from the camera side to the lens (step S1).

  The camera identification unit 3 identifies whether the sent camera ID is an aberration correction compatible camera (step S2).

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is an aberration correction compatible camera (Yes in step S2), aberration correction data is sent from the lens 100 to the camera 200 (step S3).

  Next, it is inspected whether the first stroke switch (SW1) is ON (step S5).

  If the first stroke switch (SW1) is not ON (No in step S5), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5). When the first stroke switch (SW1) is ON (Yes in step S5), the photographing preparation state is entered (step S6).

  Next, it is inspected whether the second stroke switch (SW2) is ON (step S7).

  If the second stroke switch (SW2) is not ON (No in step S7), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5). If the second stroke switch (SW2) is ON (Yes in step S7), the exposure operation is started (step S8).

  Next, the image data obtained from the image sensor is subjected to various correction processes based on the aberration correction data obtained in step 3 (step S9).

  Next, the image data corrected in step S9 is recorded and stored in a storage medium (step S10).

  Thereafter, when the power is ON (Yes in step S11), the process returns to the step of checking whether the first stroke switch (SW1) is ON in step S5. If the power is OFF (No in step S11), the process ends.

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is a camera that does not support aberration correction (No in step S2), the focus driving unit 9 sets the focus barrel in the focusing range according to a command from the lens CPU1. Drive to an outside position (step S40).

  The out-of-focus position is a range that is not used at the time of normal photographing at a position further from the closest end of WIDE or further from the infinite end of TELE. As described above, the position outside the focus range is a range that is not used at each zoom position within the focus movement range, and a region outside the focus range is not separately provided outside the focus movement range.

  Therefore, the focus movement range is widened and the lens is not enlarged. Even if an ON signal is input from SW1, a drive command for driving the focus barrel out of the focus range is continuously transmitted to the focus drive unit 9, so that the focus is not achieved and photographing is impossible. As described above, when the aberration correction compatible lens is attached to the camera that does not support aberration correction, a photograph with many aberrations that are not corrected for aberrations is not mistakenly taken.

  Next, it is detected by the switch detection unit 4 whether or not the photographing permission switch has performed a predetermined operation (step S41).

  When it is detected that the photographing permission switch has performed a predetermined operation (Yes in step S41), the drive command for driving the focus barrel to a position outside the focus range is canceled, and the focus barrel is moved to the focus position. (Step S42).

  If the switch detection unit 4 cannot detect the predetermined operation of the photographing permission switch within a predetermined time, the communication with the camera is turned off (step S44).

  The photographing permission switch is any one of various switches provided on the lens such as a manual focus ring, a manual zoom ring, an AF / MF switching switch, and an IS ON / OFF switching switch.

  The predetermined operation of the switch is, for example, that the manual focus ring is rotated once or more within a predetermined time. The manual zoom ring is reciprocated at least once within a fixed time from the wide end to the tele end. The AF / MF switch is switched twice or more within a certain time. For example, the IS ON / OFF switch is switched twice or more within a predetermined time.

  Next, it is inspected whether the first stroke switch (SW1) is ON (step S43).

  If the first stroke switch (SW1) is not ON (No in step S43), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S43). When the first stroke switch (SW1) is ON (Yes in step S43), the photographing preparation state is entered (step S45).

  Next, it is inspected whether the second stroke switch (SW2) is ON (step S46).

  If the second stroke switch (SW2) is not ON (No in step S46), it is checked whether the first stroke switch (SW1) is ON (step S43). When the second stroke switch (SW2) is ON (Yes in step S46), the exposure operation is started (step S47).

  Next, image data is acquired from the image sensor (step S48).

  At this time, aberration correction is not performed because the camera does not support aberration correction.

  Next, the image data corrected in step S48 is recorded and saved in a storage medium (step S49).

  Thereafter, when the power is ON (Yes in step S50), the process returns to the step of checking whether the first stroke switch (SW1) is ON in step S43. If the power is OFF (No in step S50), the process ends.

  As described above, even when the camera is mounted on a camera that does not support aberration correction, the camera can be used for shooting only when the photographer intends to perform the operation, so that all cameras can use the lens that supports aberration correction.

[Example 3]
Next, the lens of Example 3 will be described with reference to FIG. 301 is a manual zoom ring, 302 is a manual focus ring, 303 is an AF / MF switch, 304 is an ON / OFF switch for IS, and 305 is a lens information display unit. In the lens display section, the focal length of the lens, FNo. Messages such as ISO sensitivity values set by the photographer at the time of photographing, and whether the camera is compatible with aberration correction or photographing permission when a lens 301 described later is attached to the camera are displayed.

  Next, a flow when the aberration correction compatible lens 300 is attached to the camera 200 will be described with reference to FIG. First, when the power is turned on, communication processing is performed between the lens and the camera. When the communication establishment is confirmed, the camera ID is sent from the camera side to the lens (step S1).

  The camera identification unit 3 identifies whether the sent camera ID is an aberration correction compatible camera (step S2).

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is an aberration correction compatible camera (Yes in step S2), aberration correction data is sent from the lens 100 to the camera 200 (step S3).

  Next, it is inspected whether the first stroke switch (SW1) is ON (step S5). If the first stroke switch (SW1) is not ON (No in step S5), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5).

  When the first stroke switch (SW1) is ON (Yes in step S5), the photographing preparation state is entered (step S6).

  Next, it is inspected whether the second stroke switch (SW2) is ON (step S7).

  If the second stroke switch (SW2) is not ON (No in step S7), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S5). If the second stroke switch (SW2) is ON (Yes in step S7), the exposure operation is started (step S8).

  Next, the image data obtained from the image sensor is subjected to various correction processes based on the aberration correction data obtained in step 3 (step S9).

  Next, the image data corrected in step S9 is recorded and stored in a storage medium (step S10).

  Thereafter, when the power is ON (Yes in step S11), the process returns to the step of checking whether the first stroke switch (SW1) is ON in step S5. If the power is OFF (No in step S11), the process ends.

  When it is recognized that the camera 200 to which the camera identification unit 3 is attached is a camera that does not support aberration correction (No in step S2), the focus driving unit 9 sets the focus barrel in the focusing range according to a command from the lens CPU1. Drive to an outside position (step S40).

  The position outside the focus range is a range that is not used at each zoom position within the focus movement range, and a region outside the focus range is not separately provided outside the focus movement range. Therefore, the focus movement range is widened and the lens is not enlarged. Even if an ON signal is input from SW1, a drive command for driving the focus barrel out of the focus range is continuously transmitted to the focus drive unit 9, so that the focus is not achieved and photographing is impossible.

  As described above, when the aberration correction compatible lens is attached to the camera that does not support aberration correction, a photograph with many aberrations that are not corrected for aberrations is not mistakenly taken. In addition, the display unit 305 displays that shooting is not possible and a disabled state canceling method when shooting is permitted (step S401).

  For example, the display is as follows.

“It is attached to a camera that does not support aberration correction. To allow shooting, rotate the manual focus ring once. If you do not allow shooting, replace it with a camera that supports aberration correction.”
Although the manual focus ring 302 is rotated once as the photographing permission operation, the photographing permission is permitted by performing arbitrary operations of the manual zoom ring 301, the AF / MF switching switch 303, and the IS ON / OFF switching switch 304. good.

  Next, the switch detection unit 4 detects whether or not the photographing permission switch has performed a predetermined operation displayed on the display unit (step S41).

  When it is detected that the photographing permission switch has performed a predetermined operation (Yes in step S41), the drive command for driving the focus barrel to a position outside the focus range is canceled and the focus barrel is in focus. The position is moved (step S42).

  The lens information display unit 305 displays a message indicating that photographing is permitted (step S421). Next, it is inspected whether the first stroke switch (SW1) is ON (step S43).

  If the first stroke switch (SW1) is not ON (No in step S43), it is repeatedly checked whether the first stroke switch (SW1) is ON (step S43). When the first stroke switch (SW1) is ON (Yes in step S43), the photographing preparation state is entered (step S45).

  Next, it is inspected whether the second stroke switch (SW2) is ON (step S46). If the second stroke switch (SW2) is not ON (No in step S46), it is checked whether the first stroke switch (SW1) is ON (step S43).

  When the second stroke switch (SW2) is ON (Yes in step S46), the exposure operation is started (step S47).

  Next, image data is acquired from the image sensor (step S48). At this time, aberration correction is not performed because the camera does not support aberration correction.

  Next, the image data corrected in step S48 is recorded and saved in a storage medium (step S49). Thereafter, when the power is ON (Yes in step S50), the process returns to the step of checking whether the first stroke switch (SW1) is ON in step S43. If the power is OFF (No in step S50), the process ends.

  If the switch detection unit 4 cannot detect the predetermined operation of the photographing permission switch within a predetermined time (No in step S41), the communication with the camera is turned off (step S44).

  As described above, even when the camera is mounted on a camera that does not support aberration correction, the camera can be used for shooting only when the photographer intends to perform the operation, so that all cameras can use the lens that supports aberration correction.

1 Lens CPU, 2 Lens side contact, 3 Camera identification part, 4 Switch detection part,
9 Focus drive unit, 19 Camera side contact, 100 lens, 200 camera,
305 Lens information display section

Claims (8)

An interchangeable lens that can be attached to and detached from the camera body,
A communication unit that communicates with the camera;
Camera identification means for identifying whether the mounted camera is an aberration correction compatible camera;
An interchangeable lens, comprising: a non-photographable state when the camera identifying means identifies a camera that does not support aberration correction. The interchangeable lens according to claim 1, wherein the non-photographable state means that the focus lens group is driven out of a focusing range. An interchangeable lens that can be attached to and detached from the camera body,
A communication unit that communicates with the camera;
Camera identification means for identifying whether the mounted camera is an aberration correction compatible camera;
A shooting permission switch,
A switch detection unit that detects that the photographing permission switch has been operated,
When the camera detection means detects a camera that does not support aberration correction, the camera is in a shooting disabled state, and when the switch detection unit detects that the shooting permission switch has been operated, the shooting disabled state is canceled and shooting is enabled. A featured interchangeable lens. 4. The display device according to claim 1, further comprising: a display unit that displays whether or not the camera mounted on the outer peripheral portion of the lens is an aberration correction compatible camera and an operation method of the photographing permission switch. interchangeable lens. The interchangeable lens according to claim 4, wherein the photographing permission switch is a zoom ring that can change a focal length of the lens by rotating around the optical axis. 5. The interchangeable lens according to claim 4, wherein the photographing permission switch is a manual focus ring capable of performing a focusing operation by driving a focus group by rotating around the optical axis. The photographing permission switch is an AF / MF switching switch for switching between an autofocus mode in which a lens automatically focuses according to a subject position and a manual focus mode in which a lens is manually focused according to a rotation operation of a manual focus ring. The interchangeable lens according to claim 4. 5. The IS-ON / OFF switch for moving the image-taking permission switch ON and OFF, which moves in a plane orthogonal to the optical axis direction and switches on and off the operation of the image stabilizing unit for preventing camera shake. The interchangeable lens described.