U.S. patent application number 13/764074 was filed with the patent office on 2013-06-13 for image pickup apparatus and lens apparatus.
This patent application is currently assigned to CANON KABUSHIKI KAISHA. The applicant listed for this patent is Canon Kabushiki Kaisha. Invention is credited to Hiroshi Noda.
Application Number | 20130148949 13/764074 |
Document ID | / |
Family ID | 40088329 |
Filed Date | 2013-06-13 |
United States Patent
Application |
20130148949 |
Kind Code |
A1 |
Noda; Hiroshi |
June 13, 2013 |
IMAGE PICKUP APPARATUS AND LENS APPARATUS
Abstract
An image pickup apparatus having removably attached thereto a
lens apparatus including a blur correction unit includes a
selection unit configured to select a first mode in which a
mechanical shutter is used to start exposure or a second mode in
which an electronic shutter is used to start exposure; and a
controller configured to output information indicating the start of
exposure to the lens apparatus. The controller changes the
information indicating the start of exposure depending on whether
the first mode or the second mode is selected to control the lens
apparatus to perform different blur correction operations.
Inventors: |
Noda; Hiroshi; (Tokyo,
JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Canon Kabushiki Kaisha; |
Tokyo |
|
JP |
|
|
Assignee: |
CANON KABUSHIKI KAISHA
Tokyo
JP
|
Family ID: |
40088329 |
Appl. No.: |
13/764074 |
Filed: |
February 11, 2013 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13486350 |
Jun 1, 2012 |
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13764074 |
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12126186 |
May 23, 2008 |
8224168 |
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13486350 |
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Current U.S.
Class: |
396/55 |
Current CPC
Class: |
G03B 17/00 20130101;
G03B 7/00 20130101; H04N 5/23245 20130101; H04N 5/23248 20130101;
G02B 27/64 20130101; H04N 5/2353 20130101; G03B 2207/005
20130101 |
Class at
Publication: |
396/55 |
International
Class: |
G02B 27/64 20060101
G02B027/64; G03B 17/00 20060101 G03B017/00 |
Foreign Application Data
Date |
Code |
Application Number |
May 28, 2007 |
JP |
2007-140189 |
Claims
1. An image pickup apparatus having removably attached thereto a
lens apparatus including a blur correction unit to perform a blur
correction, comprising: a selection unit mounted in the image
pickup apparatus to select a first mode in which a mechanical
shutter is used to start exposure for recording an image or a
second mode in which an electronic shutter is used to start
exposure; and a controller mounted in the image pickup apparatus to
output information to the lens apparatus, the information
comprising first information when the first mode is selected, the
information comprising second information when the second mode is
selected, the second information different than the first
information; wherein the blur correction corresponds to the
information, wherein a blur correction corresponding to the first
information is different than a blur correction corresponding to
the second information.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/486,350, filed Jun. 1, 2012, which is a
continuation of U.S. patent application Ser. No. 12/126,186, filed
May 23, 2008, now U.S. Pat. No. 8,224,168, which claims the benefit
of Japanese Application No. 2007-140189, filed May 28, 2007, all of
which are hereby incorporated by reference herein in their
entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to an image pickup apparatus
equipped with an electronic shutter and a mechanical shutter, and a
lens apparatus.
[0004] 2. Description of the Related Art
[0005] Electronic shutters and mechanical shutters have been
available as shutters used for exposure control. The electronic
shutters are operable to control a timing of starting storing of
electric charge in an image pickup element or a timing of reading
the electric charge, and the mechanical shutters are provided with
light-shielding blades (front curtain and rear curtain) configured
to block a light-receiving surface of an image pickup element from
light. Image pickup apparatuses including shutters of these types
may also be provided with a blur correction device (blur correction
unit) configured to correct for image blur caused by shaking of the
image pickup apparatuses or by vibration which may occur during
operation of the shutters.
[0006] An image pickup apparatus including a mechanical shutter as
a shutter has the following structure. Vibration caused during
operation of the shutter, or more specifically, vibration caused
during operation of the light-shielding blades, is detected, and a
blur correction value is calculated on the basis of the detected
vibration. The blur correction value is output to a blur correction
device so that image blur caused by the vibration can be corrected
for (Japanese Patent Laid-Open No. 09-043660).
SUMMARY OF THE INVENTION
[0007] The present invention provides an image pickup apparatus
configured to output information associated with a shutter to be
selected to a blur correction unit to provide a blur-free image,
and a lens apparatus.
[0008] There have not been available image pickup apparatuses
including both an electronic shutter and a mechanical shutter as
shutters so that one of these shutters can selectively be used for
exposure control. In such image pickup apparatuses, a blur
correction value to be output to a blur correction device is
changed depending on which of the electronic shutter and the
mechanical shutter is used as a shutter for exposure control in
order to appropriately correct for image blur.
[0009] According to a first aspect of the present invention, an
image pickup apparatus having removably attached thereto a lens
apparatus including a blur correction unit includes a selection
unit configured to select a first mode in which a mechanical
shutter is used to start exposure or a second mode in which an
electronic shutter is used to start exposure, and a controller
configured to output information indicating the start of exposure
to the lens apparatus. The controller changes the information
indicating the start of exposure between first information and
second information depending on whether the first mode or the
second mode is selected to control the lens apparatus to perform
different blur correction operations.
[0010] According to a second aspect of the present invention, an
image pickup apparatus having removably attached thereto a lens
apparatus including a blur correction unit includes a selection
unit configured to select a first mode in which a mechanical
shutter is used to start exposure or a second mode in which an
electronic shutter is used to start exposure, and a controller
configured to control operation of the lens apparatus. The
controller outputs information indicating the start of exposure to
the lens apparatus to change a blur correction operation of the
lens apparatus when the first mode is selected, and does not output
information indicating the start of exposure to the lens apparatus
when the second mode is selected.
[0011] Further features of the present invention will become
apparent from the following description of exemplary embodiments
with reference to the attached drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a block diagram of an image pickup apparatus
according to an exemplary embodiment of the present invention.
[0013] FIGS. 2A to 2C are external views of the image pickup
apparatus according to the exemplary embodiment of the present
invention.
[0014] FIG. 3 is a conceptual diagram showing automatic selection
of a shutter according to the exemplary embodiment of the present
invention.
[0015] FIG. 4 is a flowchart showing a process for automatically
selecting a shutter and performing processing for blur correction
information according to the exemplary embodiment of the present
invention.
[0016] FIG. 5 is a conceptual diagram showing manual selection of a
shutter according to the exemplary embodiment of the present
invention.
[0017] FIG. 6 is a flowchart showing a process for automatically
selecting a shutter and performing processing for blur correction
information according to the exemplary embodiment of the present
invention.
DESCRIPTION OF THE EMBODIMENTS
[0018] Exemplary embodiments of the present invention will be
described hereinafter.
[0019] FIG. 1 is a diagram showing a structure of an image pickup
apparatus according to an exemplary embodiment of the present
invention. Referring to FIG. 1, the image pickup apparatus includes
an interchangeable lens 201 and a main body 211 of the image pickup
apparatus. The image pickup apparatus of the exemplary embodiment
further includes an electronic shutter and a mechanical shutter as
selectable shutters.
[0020] The interchangeable lens 201 includes a blur correction
optical system 202 configured to correct for image blur, and a blur
correction control microcomputer 203 configured to control the
driving of the blur correction optical system 202 on the basis of a
blur detection signal. The blur correction optical system 202, the
blur correction control microcomputer 203, etc., constitute a blur
correction device (blur correction unit) configured to correct for
image blur.
[0021] The main body 211 includes a reflex mirror 214 configured to
direct a light beam coming from the interchangeable lens 201 toward
a finder optical system 212 or an image pickup element 213. The
main body 211 further includes a vibration detection unit 215
configured to detect vibration such as shaking of the image pickup
apparatus or vibration which may occur during operation of the
shutters, and a light-shielding mask 216 configured to block a
light beam coming from the periphery of the imaging circle of the
interchangeable lens 201, which is not required in view of the size
of a photographed image. The main body 211 further includes a front
curtain 217 and rear curtain 218 of the mechanical shutter, a
liquid crystal display 219 operable to provide visual display such
as live-view display, and position determining units 220 and 221
configured to determine a boundary position.
[0022] The main body 211 further includes a main body microcomputer
222 configured to control the overall operation of the image pickup
apparatus. Various types of processing such as calculations,
storing of blur correction information, and storing of records, and
an electronic shutter function are implemented by the main body
microcomputer 222, a built-in program preset therein, and a memory
by using various devices (not shown). The main body 211 further
includes an automatic selector configured to select one of the
shutters, which is described below.
[0023] FIGS. 2A to 2C are external views of the image pickup
apparatus having the structure described above.
[0024] The image pickup apparatus includes a compact flash (CF)
card cover 101 designed to protect an external memory, or a CF
card, having photographed digital images stored therein, and a CF
card mounting unit or card slot 102 that appears when the CF card
cover 101 opens. The image pickup apparatus further includes a lens
mount 103 on which the interchangeable lens 201 is mounted when it
is attached to the main body 211. The image pickup apparatus
further includes a power lever 105 operable to power on or off the
image pickup apparatus, a battery cover 106 that is openable and
closable to insert or remove a battery, and a liquid crystal
display 107 operable to display various types of setting
information and images. The liquid crystal display 107 corresponds
to the liquid crystal display 219 shown in FIG. 1.
[0025] The image pickup apparatus further includes a setting dial
108 operable to set a shutter speed, an aperture value, a shutter
control method, etc., and a mode dial 110 operable to set an
operating mode of the image pickup apparatus (e.g., a camera). The
image pickup apparatus further includes an image playback button
111 operable to display a photographed image on the liquid crystal
display 107, a menu display button 112 operable to display a
setting screen on the liquid crystal display 107, a release button
113 operable to start a photographing operation, and a live-view
start button 114.
[0026] A sequence of operations prior to live-view shooting will
now be described.
[0027] First, the battery cover 106 is opened to place a charged
buttery into the main body 211, and the battery cover 106 is
closed. Then, the CF card cover 101 is opened to insert a CF card
into the card slot 102, and the CF card cover 101 is closed. Then,
the interchangeable lens 201 is mounted on the lens mount 103, and
the power lever 105 is operated to power on the image pickup
apparatus.
[0028] Then, the mode dial 110 is operated to set a live-view
shooting mode. After the image pickup apparatus is directed to an
object, the release button 113 is half-pressed. In response to the
half-press operation, the main body microcomputer 222 controls the
reflex mirror 214 to move up and the mechanical shutter to open,
and causes a light beam coming from the interchangeable lens 201 to
enter the image pickup element 213. Images formed on the image
pickup element 213 are sequentially displayed on the liquid crystal
display 107 in the live view. A user performs operations such as
image composition and focusing while viewing the live-view images,
and fully presses the release button 113. Thus, actual
photographing is performed.
[0029] Which shutter of the electronic shutter and the mechanical
shutter is used to perform exposure control during the actual
photographing will be described in the context of automatic
selection.
[0030] In the live-view shooting mode, the reflex mirror 214 flips
up. Thus, a photographing operation is performed by using the
electronic shutter. In a case where the live-view shooting mode has
been set when the release button 113 is pressed, as described
below, the automatic selector, which is provided in the main body
microcomputer 222, selects the electronic shutter as a shutter to
be used for exposure control. In FIG. 2B, the setting screen is
displayed on the liquid crystal display 107 to allow manual
selection of a shutter method. The image pickup apparatus is
therefore capable of automatically selecting a shutter method using
the automatic selector and manually selecting a shutter method by a
user. The details of the manual selection of a shutter method
during photographing are described below.
[0031] FIG. 3 is a conceptual diagram showing automatic selection
of the electronic shutter or the mechanical shutter as a
shutter.
[0032] When the release button 113 is half-pressed, camera status
information, or more specifically, information indicating whether
the current shooting mode is a "normal shooting mode" or a
"live-view shooting mode", is generated (#301).
[0033] The camera status information is detected by the automatic
selector provided in the main body 211. If the camera status
information indicates the "normal shooting mode", the automatic
selector selects the mechanical shutter as a shutter to be used for
exposure control. Then, blur correction information associated with
the mechanical shutter is stored in a blur correction information
storage unit (steps #302, #303, and #305 are performed in this
order). The stored blur correction information is blur correction
information for correcting for image blur caused by vibration which
may occur during operation of the mechanical shutter. The blur
correction information may be stored in advance in the memory or
may be determined by a calculation based on detected vibration.
[0034] If the camera status information indicates the "live-view
shooting mode", the automatic selector stores blur correction
information (second information), which is different from the blur
correction information associated with the mechanical shutter
(first information). That is, the automatic selector stores the
blur correction information associated with the electronic shutter
in the blur correction information storage unit (steps #302, #304,
and #305 are performed in this order). The details of the blur
correction information in this case are described below.
[0035] The blur correction information stored in the blur
correction information storage unit is transmitted (or output) to a
blur correction device (that is, the blur correction microcomputer
203) included in the interchangeable lens 201 through a blur
correction information notifying unit (steps #306 and #307 are
performed in this order).
[0036] Accordingly, blur correction information can be
automatically set in association with a camera status during
photographing.
[0037] A process for automatically selecting a shutter and
outputting blur correction information to the blur correction
device in a case where the live-view shooting mode is selected will
be described with reference to a flowchart shown in FIG. 4. The
process is performed by the main body microcomputer 222 including
the automatic selector, blur correction information storage unit,
and blur correction information notifying unit shown in FIG. 3.
[0038] In step S501, live-view shooting starts. In step S502, the
reflex mirror 214 moves up (that is, the reflex mirror 214 is
retracted from the photographing optical path). In step S503, the
mechanical shutter is released (that is, the front curtain 217 is
caused to run). This allows a photographing light beam to enter the
image pickup element 213. In step S504, a live-view operation is
performed in which an image formed on the image pickup element 213
is displayed on the liquid crystal display 107.
[0039] In step S505, exposure calculation is performed to
appropriately adjust the exposure of the image displayed in the
live view. In step S506, information necessary for focusing is
obtained from an image obtained during the live-view shooting or
the like, and focus control is performed. In step S507, it is
determined whether or not a photographing operation has been
instructed, that is, whether or not the release button 113 has been
fully pressed. If the release button 113 has not been fully pressed
(NO in step S507), the process returns to step S504, and operations
similar to those described above are repeated.
[0040] If the release button 113 has fully been pressed and a
photographing operation has been instructed (YES in step S507), the
process proceeds from step S507 to step S508. In step S508, as
described above, the automatic selector selects one of the
electronic shutter and the mechanical shutter as a shutter to be
used to start the photographing operation. In step S509, blur
correction information associated with the selected shutter is
stored in the blur correction information storage unit. In the
live-view shooting mode, since the mechanical shutter is already
released in step S503, the electronic shutter is selected in step
S509. Since the electronic shutter is selected, a value equivalent
to zero is stored as blur correction information in the blur
correction information storage unit. Then, the process proceeds to
step S510, and the live-view operation in which an image is being
displayed on the liquid crystal display 107 prior to a
photographing operation is terminated. Then, the process proceeds
to step S511.
[0041] The blur correction information stored in this way is output
to the blur correction device through the blur correction
information notifying unit in steps S511 and S512.
[0042] The details of the blur correction information will now be
described.
[0043] The blur correction information includes three pieces of
information: (1) time information indicating at what time later
than a certain time vibration will occur due to the operation of
the shutter; (2) information indicating the degree of the vibration
that will occur at the specified time: and (3) information
indicating within what period of time the vibration will stop. In
order to specify the "certain time", real-time communication is
also performed.
[0044] The blur correction information is output prior to the start
of exposure for recording so that blur correction based on the blur
correction information can be synchronized with the exposure.
[0045] For example, in a case where the mechanical shutter is
selected in the normal shooting mode, the mechanical shutter may be
associated with blur correction information indicating "vibration
occurs 2 ms later with a degree of 100 counts, which is counted by
a sensor of the blur correction device, and the vibration continues
for a period of about 1 ms". In this case, the following blur
correction information is transmitted (or output) to the blur
correction device:
[0046] blur correction information=2 ms:100 counts:1 ms
Then, the timing of starting the operation of the shutter is
transmitted to the blur correction device. Thus, the blur
correction control microcomputer 203 performs blur correction
control using the transmitted blur correction information from the
timing of starting the operation to effectively prevent vibration
due to disturbance other than shaking caused by the user.
[0047] In a case where the electronic shutter is selected as a
shutter, such disturbance as described above may not occur, and the
following blur correction information is transmitted to the blur
correction device:
[0048] blur correction information=2 ms:0 counts:1 ms
In this case, blur correction is not required and no blur
correction information may be transmitted. However, it is necessary
to transmit some information because a system including an
interchangeable lens and a main body of an image pickup apparatus
is established by a rule in which transmitted blur correction
information is used for blur correction control that starts in
response to communication at a timing of starting the operation of
the shutter. In this exemplary embodiment, therefore, blur
correction information indicating that vibration with a degree of 0
counts is transmitted to the blur correction device. This allows
the system to be established without changing the rule between the
lens and the main body.
[0049] Alternatively, if such a rule does not exist between the
lens and the main body or if a new rule is applicable even though
an existing rule exists, no blur correction information may be
transmitted.
[0050] In a case where the electronic shutter is selected, due to
the absence of vibration, information parts expressed in the units
of time may be set to 0 as follows:
[0051] blur correction information=0 ms:0 counts:0 ms
However, the electronic shutter is newly developed technology, and
some interchangeable lenses equipped with a blur correction device
may be incompatible with such electronic shutter technology. If
such interchangeable lenses are operated with parameters expressed
in the units of time being set to 0, control failure may occur. For
example, a general microcomputer is provided with a timer device as
a hardware device used for time processing. The timer device is
designed to count a time period more than zero, and is used for
latency control in which a certain operation starts after that time
period. The timer device presumably counts a time period more than
zero, and the ability to transmit "time=0 sec" to indicate no
latency time depends on whether or not a control program for the
timer device supports such usage. If the control program does not
support the usage, setting the latency time to zero might cause
unexpected results such as latency as long as the timer device can
count.
[0052] In this exemplary embodiment, a desired effect is obtained
by setting blur correction information to zero counts, and there is
no problem in representing a characteristic of the electronic
shutter in which no vibration occurs if two parameters expressed in
the units of time are set to values other than zero. However, in
view of system's backward compatibility with old products or in
order to avoid unintended operation with the use of a combination
of a camera and an interchangeable lens manufactured by unknown
manufacturer different from that of the camera, the blur correction
information described above (2 ms:0 count:1 ms) is transmitted.
That is, blur correction information that does not enable the blur
correction device (blur correction unit) is output to the blur
correction device. In order to prevent overcorrection of the blur
correction described above, furthermore, blur correction
information may be maintained so that the amount of blur correction
performed for the electronic shutter is reduced compared with the
amount of blur correction performed for the mechanical shutter.
[0053] Referring back to FIG. 4, after the blur correction
information described above is output to the blur correction
device, the process proceeds to step S513, and a photographing
operation is performed. The photographing operation is similar to
an existing photographing operation, and will not be discussed
herein in detail.
[0054] FIG. 5 is a conceptual diagram showing manual selection of
one of the electronic shutter or the mechanical shutter as a
shutter.
[0055] As shown in FIG. 2, a setting screen is displayed on the
liquid crystal display 107, and one of the shutters is selected
through a graphical user interface (GUI) (#401). GUI is a user
interface that allows a user to select an item by using a camera
operation member (such as the menu display button 112 or the
setting dial 108) (in case of a personal computer, by using a
mouse) to change a setting value while viewing a menu displayed on
the liquid crystal display 107 shown in FIG. 2. Which of the
mechanical shutter and the electronic shutter has been selected as
a shutter is detected by a selection detector provided in the main
body microcomputer 222. If the "mechanical shutter" is selected as
a shutter, the selection detector stores the above-described blur
correction information associated with the mechanical shutter in
the blur correction information storage unit (steps #402, #403, and
#405 are performed in this order).
[0056] If the "electronic shutter" is selected as a shutter, the
selection detector stores the above-described blur correction
information associated with the electronic shutter in the blur
correction information storage unit (steps #402, #404, and #405 are
performed in this order).
[0057] The blur correction information stored in the blur
correction information storage unit is transmitted (or output) to
the blur correction device included in the interchangeable lens 201
through the blur correction information notifying unit (steps #406
and #407 are performed in this order).
[0058] Accordingly, blur correction information can be manually set
according to a GUI setting prior to photographing.
[0059] A process for outputting blur correction information to the
blur correction device in a case where the live-view shooting mode
is selected and a shutter is manually selected will be described
with reference to a flowchart shown in FIG. 6. The process is
performed by the main body microcomputer 222 including the GUI,
selection detector, blur correction information storage unit, and
blur correction information notifying unit shown in FIG. 5.
[0060] In step S601, live-view shooting starts. In step S602, the
reflex mirror 214 moves up. In step S603, the mechanical shutter is
released (that is, the front curtain 217 is caused to run). This
allows a photographing light beam to enter the image pickup element
213. In step S604, a live-view operation is performed in which an
image formed on the image pickup element 213 is displayed on the
liquid crystal display 107.
[0061] In step S605, exposure calculation is performed to
appropriately adjust the exposure of the image displayed in the
live view. In step S606, information necessary for focusing is
obtained from an image obtained during the live-view shooting or
the like, and focus control is performed. In step S607, it is
determined whether or not a photographing operation has been
instructed, that is, whether or not the release button 113 has been
fully pressed. If the release button 113 has not been fully pressed
(NO in step S607), the process returns to step S604, and operations
similar to those described above are repeated.
[0062] If the release button 113 has been fully pressed and a
photographing operation has been instructed (YES in step S607), the
process proceeds from step S607 to step S608. In step S608, the
selection detector detects whether the electronic shutter or the
mechanical shutter has been manually selected as a shutter to be
used to start the photographing operation on the basis of GUI
settings of step S609. In step S610, blur correction information
associated with the selected shutter (the mechanical shutter or the
electronic shutter) is stored in the blur correction information
storage unit. Then, the process proceeds to step S611, and the
live-view operation in which an image is being displayed on the
liquid crystal display 107 prior to a photographing operation is
terminated. Then, the process proceeds to step S612. The processing
performed for the stored blur correction information is similar to
that in the automatic selection described above, and will not be
discussed herein in detail.
[0063] The blur correction information stored in this way is output
to the blur correction device through the blur correction
information notifying unit in steps S612 and S613.
[0064] After the blur correction information described above is
output to the blur correction device, the process proceeds to step
S614, and a photographing operation is performed for recording an
image. In this case, exposure control is performed using the
manually selected shutter. If the electronic shutter is selected, a
timing of starting the operation of the electronic shutter
corresponding to the front curtain 217 is output.
[0065] Then, the image pickup element 213 is exposed to light for
recording, and the rear curtain 218 of the mechanical shutter is
closed after a predetermined period of time has elapsed. A signal
for reading is read with the image pickup element 213 being
light-shielded, and afterwards the front curtain 217 and the rear
curtain 218 of the mechanical shutter are released. Then, as
described in step S603, the front curtain 217 is caused to run to
allow a photographing light beam to enter the image pickup element
213.
[0066] In this exemplary embodiment, the image pickup element 213,
which is exposed to light for recording, is light-shielded by using
the rear curtain 218 of the mechanical shutter after the recording
is finished. Such a light shielding operation may be omitted in a
case where the number of recording pixels is small or in a case
where the image pickup element 213 can be driven at a high
speed.
[0067] If the mechanical shutter is selected, since the mechanical
shutter is already released in step 603, the rear curtain 218 of
the mechanical shutter is further caused to run and a shutter
charge operation is performed again. Further description is not
necessary in the present invention and is omitted.
[0068] According to the foregoing exemplary embodiment, in a case
where the electronic shutter is automatically or manually selected
as a shutter, blur correction information that does not enable the
blur correction device (information having blur correction equal to
zero) is output to the blur correction device.
[0069] Since blur correction information associated with a shutter
to be selected can be selectably output to the blur correction
device, the image pickup apparatus can provide a blur-free image if
either shutter is selected.
[0070] The correspondence between elements described in the
appended claims and the foregoing exemplary embodiment will be
described. The automatic selector shown in FIG. 3 or the GUI shown
in FIG. 5 corresponds to a selection unit configured to select a
mechanical shutter or an electronic shutter on the basis of
shooting conditions or on the basis of a manual operation according
to the present invention. The blur correction optical system 202
and the blur correction control microcomputer 203 correspond to a
blur correction unit configured to correct for image blur. The main
body microcomputer 222 corresponds to a controller configured to
output first information or second information to the blur
correction unit at a timing of starting operation of the selected
mechanical or electronic shutter. The blur correction information
associated with the mechanical shutter corresponds to the first
information, and the blur correction information associated with
the electronic shutter corresponds to the second information, the
first information and the second information being different from
each other.
[0071] The interchangeable lens 201 corresponds to a lens apparatus
attachable to the image pickup apparatus according to the present
invention, and the blur correction control microcomputer 203
corresponds to a receiving unit configured to receive a signal from
the image pickup apparatus.
[0072] The present invention is not limited to an image pickup
apparatus having an interchangeable lens attached thereto, and may
be applied to an image pickup apparatus integrated with a lens.
[0073] In the present invention, the blur correction unit may not
necessarily be implemented by the blur correction optical system
202. In an embodiment of the present invention, the blur correction
unit may be implemented by an existing unit configured to perform
blur correction by moving an image pickup element on a plane
perpendicular to an optical axis.
[0074] While the present invention has been described with
reference to exemplary embodiments, it is to be understood that the
invention is not limited to the disclosed exemplary embodiments.
The scope of the following claims is to be accorded the broadest
interpretation so as to encompass all modifications and equivalent
structures and functions.
* * * * *