JP4356341B2 - Interchangeable lens and camera system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interchangeable lens and a camera system by which photographing based on composition supposed by a photographer can be performed and blur can be corrected. <P>SOLUTION: The camera system is provided with a correction lens 102a forming at least a part of a photographing optical system and capable of correcting the blur of an image by changing the optical axis of the photographing optical system and a correction lens driving circuit 103 for driving a blur correcting optical system and sets whether centering operation before exposure which drives the correction lens 102a so that the optical axis of the photographing optical system is returned to a prescribed reference state before permitting the start of exposure is to be performed or not by a blur correction mode switch 108 and a lens microcomputer 109. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interchangeable lens having a blur correction function for correcting image blur due to camera shake and the like, and a camera system.
[0002]
[Prior art]
Conventionally, in an interchangeable lens having a blur correction function and a camera system (hereinafter referred to as a blur correction interchangeable lens or the like), for example, a direction in which the correction lens (blur correction optical system) is substantially orthogonal to the optical axis of the photographing optical system The image blur was corrected by changing the optical axis. In such a shake correction interchangeable lens or the like, since the drive range of the correction lens is finite, when the drive position is in the periphery of the drive range, a drive stroke shortage at the time of shake correction is expected. Therefore, conventionally, after the correction lens is driven to the center of the driving range before exposure (hereinafter referred to as centering operation), the shake correction operation is started again and exposure is prohibited (Patent Document 1) or the exposure operation is prohibited. A technique (Patent Document 2) is proposed.
[0003]
[Patent Document 1]
JP 63-129624 A [Patent Document 2]
Japanese Patent Laid-Open No. 4-95932
[Problems to be solved by the invention]
However, in the conventional blur correction interchangeable lens or the like, since the centering operation is performed immediately before exposure, there is a problem that the composition slightly changes before and after the centering operation. In the conventional technique described above, since the emphasis is on the blur correction operation, the composition has been sacrificed. Therefore, the composition confirmed by the photographer before the exposure sometimes deviates from the composition of the photographed image.
Taking into account the use form of the shake correction interchangeable lens, etc., it is assumed that shooting will be performed in various scenes and various situations, and if you want to obtain an image with a high blur correction effect by focusing on the shake correction operation, Although blur correction is important, there are cases where it is desired to obtain an image taken with a composition intended by the photographer. However, the conventional technology has not been able to meet such a demand.
[0005]
An object of the present invention is to provide an interchangeable lens and a camera system that can perform photographing with a composition assumed by a photographer and can perform blur correction.
[0006]
[Means for Solving the Problems]
The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In other words, the invention according to claim 1 forms an imaging optical system and at least a part of the imaging optical system, and corrects image blur by changing the optical axis of the imaging optical system (102a). ), A shake correction drive unit (103) for driving the shake correction optical system, and before exposure for driving the optical axis of the shake correction optical system to the center position of the movable range of the shake correction optical system before exposure starts. An interchangeable lens including a pre-exposure centering selection switch (108) capable of selecting a first state in which a centering operation is performed and a second state in which the pre-exposure centering operation is not performed , wherein the pre-exposure centering selection switch includes: A selector that can be operated by a photographer, and a circuit in the interchangeable lens that can communicate with the camera body via a communication circuit in a state where the interchangeable lens is mounted on the camera body. A control unit that controls, and selects one of the first state and the second state based on the state of the selector, or interlocks with a shooting mode of the camera body based on a communication result with the camera body Thus, the interchangeable lens (100) can be set to select one of the first state and the second state .
[0007]
According to a second aspect of the present invention, in the interchangeable lens according to the first aspect, when the control unit is in the first state, from the time when the camera body gives a blur correction instruction during exposure to the control unit, The interchangeable lens (100) is characterized in that control is performed so that the pre-exposure centering operation is performed within a period of time until the start of exposure .
[0008]
According to a third aspect of the present invention, in the interchangeable lens according to the second aspect , when the control unit is in the first state, the position of the blur correction optical system is held until the start of exposure after the pre-exposure centering operation. It is controlled so that it is an interchangeable lens (100) characterized by the above.
[0009]
According to a fourth aspect of the present invention, in the interchangeable lens according to the third aspect , when the control unit is in the first state, the position of the blur correction optical system is held until the start of exposure after the pre-exposure centering operation. Then, when the exposure start time is reached , the interchangeable lens is controlled so as to resume correction of image blur .
[0010]
A fifth aspect of the invention includes the interchangeable lens according to any one of the first to fourth aspects, and a camera body having a photographing mode switch for setting the photographing mode. it is a camera system (100 and 112) that.
[0011]
A sixth aspect of the present invention is the camera system according to the fifth aspect, wherein the camera body includes a body side control unit capable of communicating with the control unit of the interchangeable lens. 112).
[0012]
A seventh aspect of the present invention is the camera system according to the sixth aspect, wherein the interchangeable lens includes a lens side communication circuit used for communication with the camera body, and the camera body includes the interchangeable lens. It is a camera system (100, 112) which has a body side communication circuit used for communication with .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing an embodiment of an interchangeable lens and camera system according to the present invention.
The present embodiment is a single-lens reflex camera system in which the interchangeable lens 100 can be attached to and detached from the camera body 112.
The interchangeable lens 100 has a shake correction function, and includes an angular velocity sensor 101, a correction lens 102a, a correction lens drive circuit 103, an EEPROM 104, an electromagnetic lock drive circuit 105, a correction lens position detection unit 106, a shake detection circuit 107, and a shake correction mode. A switch 108, a lens microcomputer 109, a communication circuit 110, a mount 111, and the like are included.
The camera body 112 includes a camera microcomputer 113, a main switch (SW) 114, a half-press switch (SW) 115, a communication circuit 116, a mount 117, a full-press switch (SW) 118, a shooting mode switch (SW) 119, and the like. ing.
[0015]
In the present embodiment, the means for driving the correction lens 102a in two directions perpendicular to the optical axis, the position detection of the correction lens 102a, and the like are performed in the same manner as in the prior art. Only the explanation will be given. Further, some mechanisms and circuits such as shake detection, position detection and drive of the correction lens 102a require two directions in the yawing direction and the pitching direction, and these have the same configuration in each direction. Therefore, the following description will be given only for one direction.
[0016]
Inside the camera body 112 is a microcomputer 113 that controls all operations on the camera body 112 side. The main SW 114 performs a power on / off operation on the camera side. The release switch has three states of OFF, half-press and full-press. In the following description, the half-press SW 115 and the full-press SW 118 will be described separately.
The communication circuit 116 is a camera-side communication member having a plurality of contacts for communicating with a lens microcomputer 109 described later. The mount 117 is a camera-side mount for mechanically connecting to the interchangeable lens 100.
[0017]
The correction lens 102a is a lens that forms part of a photographing optical system (not shown), and is a blur correction optical system that can move (shift) in a plane perpendicular to the optical axis I in order to perform blur correction. The correction lens 102a is movable within a predetermined movable range.
The correction lens position detection unit 106 is a part that detects the position of the correction lens 102 a, and the detection result is transmitted to the lens microcomputer 109.
[0018]
The correction lens driving circuit 103 is a circuit that controls the blur correction driving unit 102b that drives the correction lens 102a during the blur correction operation. The correction lens driving circuit 103 performs feedback control so as to keep the correction lens 102a at the correction lens target position based on a correction lens target position signal from the lens microcomputer 109 described later and a correction lens position signal from the correction lens position detection circuit 106. .
[0019]
The electromagnetic lock drive circuit 105 is a lock unit that locks the correction lens 102a at substantially the center of the movable range.
The shake detection circuit 107 is a circuit that detects the shake generated in the interchangeable lens 100, detects the angular velocity due to shake using the output of the angular velocity sensor 101, and outputs it to the lens microcomputer 109 as a shake signal.
[0020]
The EEPROM 104 is a rewritable nonvolatile storage unit that stores adjustment values related to blur correction, predetermined parameters related to the present invention, and the like.
The shake correction mode switch 108 is a selector that switches the shake correction mode by this switch, and is manually operated by the photographer. When the shake correction mode switch 108 is off, the shake correction mode gives priority to the shake correction. When the shake correction mode switch 108 is turned on, the composition priority mode performs the shake correction while giving priority to the composition.
[0021]
The lens microcomputer 109 is a one-chip microcomputer that recognizes the state of the shake correction mode switch 108 and controls all the circuits in the interchangeable lens 100 so that the interchangeable lens 100 is attached to the camera body 112. The communication with the camera microcomputer 113 is performed through the communication circuits 110 and 116.
In this embodiment, the combination of the blur correction mode switch 108 and the lens microcomputer 109 serves as a pre-exposure centering selection switch for setting whether or not to perform a pre-exposure centering operation.
Note that the power of the circuit in the interchangeable lens 100 is supplied from the camera body 112 by a known technique.
[0022]
FIG. 2 is a timing chart showing an instruction to the interchangeable lens 100 of the camera body 112 during exposure and an operation of the interchangeable lens 100 in response to the instruction.
First, the operation in the case where the shake correction priority mode when the shake correction mode switch 108 is turned off is set will be described.
[0023]
First, the operation on the camera body 112 side will be described. Since the operation of the camera body 112 is entirely controlled by the camera microcomputer 113, the operation of the camera microcomputer 113 will be described below. The camera microcomputer 113 recognizes the states of the half-press switch 115 and the full-press switch 118. In the example shown in FIG. 2, the half-push switch 115 has already been turned on, and when it is recognized that the full-push switch 118 is turned on at timing T <b> 100, the interchangeable lens 100 is communicated through the communication circuits 116 and 110. Then, instruct the camera shake correction during exposure.
[0024]
When the interchangeable lens 100 receives an instruction at T101, the interchangeable lens 100 interprets the instruction content. The time from the sent instruction to the designated exposure start is T102. Within the time period from T101 to T102, the correction lens 102a is moved to the center position of the movable range of the lens, and is moved and held at the center position (centering operation). When T102 time is reached, shake correction is started again.
By this centering operation, there is no direction in which the movable range of the correction lens 102a becomes extremely narrow, and the movable range can be widened no matter what direction the blur correction operation is performed.
[0025]
Thereafter, the user finishes full pressing at timing T103, and the camera body 112 performs an exposure operation from timing T102 to T104. When the exposure operation is finished, the camera body 112 gives an instruction to stop blur correction. At this time, if the half-press switch 115 is turned on again, an instruction to start blur correction is issued.
[0026]
Next, the operation when the composition priority mode when the shake correction mode switch 108 is on is set will be described.
First, the operation on the camera body 112 side will be described. The operation of the camera microcomputer 113 will be described below as in the case of the shake correction priority mode. The camera microcomputer 113 recognizes the states of the half-press switch 115 and the full-press switch 118. In the example shown in FIG. 2, the half-push switch 115 has already been turned on, and when it is recognized that the full-push switch 118 is turned on at timing T <b> 100, the interchangeable lens 100 is communicated through the communication circuits 116 and 110. Then, instruct the camera shake correction during exposure.
[0027]
In the composition priority mode, after receiving the shake correction support during exposure at T100, the centering operation as in the shake correction priority mode is not performed. Therefore, without causing a compositional deviation caused by the centering operation, the following exposure operation is performed with the composition confirmed by the photographer.
[0028]
During timing T102 to T104, the camera body 112 performs an exposure operation. When the exposure operation is finished, the camera body 112 gives an instruction to stop blur correction. At this time, if the half-press switch 115 is turned on again, an instruction to start blur correction is issued.
[0029]
In this embodiment, the shake correction mode switch 108 is provided so that the photographer can freely select the shake correction priority mode or the composition priority mode. Therefore, when the photographer wants to obtain a reliable shake correction effect, the centering operation is performed by selecting the shake correction priority mode, and the movable range of the correction lens 102a can be set to an appropriate range. In addition, when shooting with the composition confirmed by the photographer is desired, shooting is performed without performing the centering operation by selecting the composition priority mode. Even at this time, the correction lens 102a exceeds the movable range. As long as there is no blur correction operation, there is a blur correction effect, and it is possible to shoot with the composition desired by the photographer.
[0030]
(Second Embodiment)
In the second embodiment, the method for selecting the blur correction priority mode and the composition priority mode is changed from the first embodiment. Accordingly, parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and redundant descriptions are omitted as appropriate. Further, since the operation contents of the shake correction priority mode and the composition priority mode are the same as those in the first embodiment, the description thereof is omitted.
[0031]
Selection (switching) of the shake correction priority mode and the composition priority mode is performed in conjunction with the setting of the shooting mode by the shooting mode switch 119 provided in the camera body 112. Specifically, the composition priority mode is set when the shooting mode is the manual mode, and the shake correction priority mode is set when the shooting mode is the auto mode.
[0032]
Switching between the shake correction priority mode and the composition priority mode is performed through the communication circuits 116 and 110 and is switched by the lens microcomputer 109. Specifically, when a shake correction start instruction during exposure is transmitted from the camera body 112 at the timing of T100 in FIG. 2, whether to perform blur correction in the blur correction priority mode or to perform blur correction in the composition priority mode. Instructed.
[0033]
In the present embodiment, since the shake correction priority mode and the composition priority mode are switched according to the setting on the camera body 112 side, the shake correction mode switch 108 may not be provided in the interchangeable lens 100. In addition, when the shake correction mode switch 108 is provided in the interchangeable lens 100, it may be possible to arbitrarily set whether the setting on the interchangeable lens 100 side is prioritized or the setting on the camera body 112 side is prioritized. .
[0034]
According to the present embodiment, the camera shaker priority mode and the composition priority mode are switched in conjunction with the setting of the shooting mode on the camera body 112 side, so that the photographer is particularly aware of the blur correction priority mode and the composition priority mode. Thus, an optimum shake correction operation can be performed with a simpler operation without switching.
[0035]
(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, in each embodiment, an example in which the switching between the correction priority mode and the composition priority mode is performed by setting a switch provided in the interchangeable lens 100 or the camera body 112 is not limited thereto. It may be determined with reference to the value of the EEPROM 104 which is the non-volatile storage section. In this case, the value of the EEPROM 104 is referred to when the lens microcomputer is activated, and the shake correction mode is determined to perform the operation.
[0036]
In each embodiment, a single-lens reflex camera system has been described as an example. However, the present invention is not limited to this. For example, a camera that is fixed to the camera body and cannot be replaced may be used.
[0037]
【The invention's effect】
As described above in detail, according to the present invention, the following effects can be obtained.
(1) A pre-exposure centering selection switch for setting whether to perform a pre-exposure centering operation for driving the blur correction optical system so as to return the optical axis of the photographing optical system to a predetermined reference state before permitting the start of exposure. Therefore, when priority is given to the blur correction effect, the centering operation is performed, and when priority is given to the composition, photographing can be performed without performing the centering operation. Therefore, it is possible to perform photographing with the composition assumed by the photographer and to ensure a sufficient driving stroke during blur correction.
[0038]
(2) Since the photographer can arbitrarily change the setting of the pre-exposure centering selection switch, it is possible to easily perform photographing desired by the photographer according to photographing conditions and the like.
[0039]
(3) Since the setting of the pre-exposure centering selection switch is changed according to the setting of the photographing mode, the photographer can perform the optimum blur correction operation without considering the presence or absence of the centering operation.
[0040]
(4) Since the setting of the pre-exposure centering selection switch follows the setting stored in the non-volatile storage unit, it is possible to retain the setting contents regardless of whether power is supplied or not when a mechanical switch is not provided. Yes, it can improve usability.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an interchangeable lens and camera system according to the present invention.
FIG. 2 is a timing chart showing an instruction to the interchangeable lens 100 of the camera body 112 during exposure and an operation of the interchangeable lens 100 in response to the instruction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Interchangeable lens 101 Angular velocity sensor 102a Correction lens 103 Correction lens drive circuit 104 EEPROM
105 Electromagnetic lock drive circuit 106 Correction lens position detection unit 107 Shake detection circuit 108 Shake correction mode switch 109 Lens microcomputer 110 Communication circuit 111 Mount 112 Camera body 113 Camera microcomputer 114 Main switch 115 Half-press switch 116 Communication circuit 117 Mount 118 Full-press switch 119 Shooting mode switch

Claims (7)

Photographic optics,
A blur correction optical system for correcting image blur by forming at least a part of the shooting optical system and changing an optical axis of the shooting optical system;
A blur correction driving unit that drives the blur correction optical system;
A first state in which the pre-exposure centering operation the optical axis of the blur correction optical system before the exposure start driving to the center position of the movable range of the blur correction optical system, and a second state that does not perform the pre-exposure centering operation An interchangeable lens including a pre-exposure centering selection switch that can be selected ,
The pre-exposure centering selection switch can communicate with the camera body via a communication circuit with a selector operable by a photographer and the interchangeable lens mounted on the camera body, and controls a circuit in the interchangeable lens A control unit that selects one of the first state and the second state based on the state of the selector, or interlocks with a shooting mode of the camera body based on a communication result with the camera body. It is possible to set whether to select one of the first state and the second state . The interchangeable lens according to claim 1,
The control unit is controlled to perform the pre-exposure centering operation within the time from the time when the camera body gives a blur correction instruction at the time of exposure to the start of exposure when in the first state. An interchangeable lens. The interchangeable lens according to claim 2 ,
In the first state, the control unit performs control so as to hold the position of the blur correction optical system until the start of exposure after the pre-exposure centering operation . The interchangeable lens according to claim 3 ,
The controller restarts image blur correction when the exposure start time is reached after holding the position of the blur correction optical system until the start of exposure after the pre-exposure centering operation in the first state. And an interchangeable lens characterized by controlling as described above . 5. A camera system comprising: the interchangeable lens according to claim 1; and a camera body having a shooting mode switch for setting the shooting mode . The camera system according to claim 5,
The camera system, wherein the camera body includes a body side control unit capable of communicating with the control unit of the interchangeable lens . The camera system according to claim 6,
The interchangeable lens has a lens side communication circuit used for communication with the camera body,
The camera system includes a body-side communication circuit used for communication with the interchangeable lens .

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