JP2004295032A - 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&NCIPI

Description

[0001]
TECHNICAL FIELD 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]
2. Description of the Related Art Conventionally, in an interchangeable lens having a shake correction function and a camera system (hereinafter referred to as a shake correction interchangeable lens), for example, a correction lens (shake correction optical system) is set in a direction substantially orthogonal to an optical axis of a photographing optical system. And image blur is 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 a peripheral portion of the drive range, a shortage of the drive stroke at the time of shake correction is expected. Therefore, conventionally, after the correction lens is driven to the center of the driving range before the exposure (hereinafter, centering operation), the blur correction operation is started again to perform the exposure (Patent Document 1), and the exposure operation is prohibited. (Patent Literature 2) and the like have been proposed.
[0003]
[Patent Document 1]
JP-A-63-129624 [Patent Document 2]
JP-A-4-95932
[Problems to be solved by the invention]
However, in the conventional blur correction interchangeable lens and the like, since the centering operation is performed immediately before the exposure, there is a problem that the composition slightly changes before and after the centering operation. In the above-described conventional technology, the composition is sacrificed because the emphasis is on the blur correction operation. Therefore, the composition that the photographer has confirmed before the exposure may be different from the composition of the captured image.
Considering the usage of the blur correction interchangeable lens etc., it is assumed that shooting will be performed in various scenes and various situations, and when it is important to obtain an image with a high blur correction effect with emphasis on the blur correction operation, Although blur correction is important, there are cases where it is desired to obtain an image photographed in a composition intended by the photographer. However, the conventional technology cannot 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 that can perform shake correction.
[0006]
[Means for Solving the Problems]
The present invention solves the above problem by the following means. In addition, in order to facilitate understanding, the description will be given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. That is, the invention according to claim 1 is a blur correction optical system that forms at least a part of the photographing optical system and corrects image blur by changing the optical axis of the photographing optical system. ), A blur correction driving unit (103) for driving the blur correction optical system, and driving the blur correction optical system to return the optical axis of the photographing optical system to a predetermined reference state before permitting the start of exposure. A pre-exposure centering selection switch (108) for setting whether or not to perform a pre-exposure centering operation.
[0007]
According to a second aspect of the present invention, in the interchangeable lens according to the first aspect, the setting of the pre-exposure centering selection switch (108) can be arbitrarily changed by a photographer. It is.
[0008]
According to a third aspect of the present invention, in the interchangeable lens according to the first or second aspect, the setting of the pre-exposure centering selection switch (108) is performed in accordance with the setting of a shooting mode in the mounted camera body (112). An interchangeable lens (100) characterized by being changed.
[0009]
A fourth aspect of the present invention is the interchangeable lens according to any one of the first to third aspects, further comprising a nonvolatile storage unit configured to store a setting of the pre-exposure centering selection switch (108). The setting of the pre-exposure centering selection switch is in accordance with the setting stored in the nonvolatile storage unit.
[0010]
According to a fifth aspect of the present invention, there is provided a camera which forms at least a part of the photographing optical system and the photographing optical system, and corrects image blur by changing a relative relationship between an optical axis of the photographing optical system and an imaging surface. A correcting optical system (102a), a blur correcting driving unit (103) for driving the blur correcting optical system, and a relation between an optical axis of the photographing optical system and an image pickup surface before a start of exposure is determined in a predetermined reference state. And a pre-exposure centering selection switch (108, 109) for setting whether or not to perform the pre-exposure centering operation for driving the shake correction optical system so as to return to the above state.
[0011]
According to a sixth aspect of the present invention, in the camera system according to the first aspect, the setting of the pre-exposure centering selection switch (108, 109) can be arbitrarily changed by a photographer. 100, 112).
[0012]
According to a seventh aspect of the present invention, in the camera system according to the first or second aspect, the setting of the pre-exposure centering selection switch (108, 109) is changed according to the setting of a photographing mode. Camera system (100, 112).
[0013]
According to an eighth aspect of the present invention, there is provided the camera system according to any one of the first to third aspects, further comprising a nonvolatile storage unit configured to store a setting of the pre-exposure centering selection switch (108, 109). The camera system (100, 112) is characterized in that the setting of the pre-exposure centering selection switch is in accordance with the setting stored in the nonvolatile storage unit.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings and the like.
(1st Embodiment)
FIG. 1 is a block diagram showing an embodiment of an interchangeable lens and a camera system according to the present invention.
This 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 blur 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. It has a switch 108, a lens microcomputer 109, a communication circuit 110, a mount 111, and the like.
The camera body 112 has 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 related art. Will be described only. In addition, some mechanisms and circuits for detecting the shake, detecting the position of the correction lens 102a, and driving the same 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 made only in one direction.
[0016]
A microcomputer 113 is provided in the camera body 112 and controls all operations on the camera body 112 side. The main SW 114 is used to turn on / off the power supply of the camera. The release switch has three states: OFF, half-press, and full-press. In the following description, the half-press SW115 and the full-press SW118 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 a part of a photographing optical system (not shown), and is a shake correction optical system that can move (shift) in a plane orthogonal to the optical axis I to perform shake correction. The correction lens 102a is movable within a predetermined movable range.
The correction lens position detection unit 106 detects the position of the correction lens 102a, and the detection result is transmitted to the lens microcomputer 109.
[0018]
The correction lens driving circuit 103 is a circuit that controls a blur correction driving unit 102b that drives the correction lens 102a during a blur correction operation. The correction lens drive circuit 103 performs feedback control based on a correction lens target position signal from the lens microcomputer 109 and a correction lens position signal from the correction lens position detection circuit 106 to keep the correction lens 102a at the correction lens target position. .
[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 a shake generated in the interchangeable lens 100, detects an angular velocity due to the shake using an output of the angular velocity sensor 101, and outputs the angular velocity to the lens microcomputer 109 as a shake signal.
[0020]
The EEPROM 104 is a rewritable nonvolatile storage unit, and stores adjustment values related to blur correction, predetermined parameters related to the present invention, and the like.
The blur correction mode switch 108 is a selector for switching a blur correction mode by this switch, and is manually operated by a photographer. When the shake correction mode switch 108 is off, the camera enters a shake correction mode in which the shake correction is prioritized, and when the shake correction mode switch 108 is turned on, the camera enters a composition priority mode in which the shake correction is performed while giving priority to the composition.
[0021]
The lens microcomputer 109 is a one-chip microcomputer. The lens microcomputer 109 recognizes the state of the shake correction mode switch 108, controls all circuits in the interchangeable lens 100, and controls the circuit when the interchangeable lens 100 is mounted on the camera body 112. The communication with the camera microcomputer 113 is performed through the communication circuits 110 and 116.
In the present embodiment, by using the blur correction mode switch 108 and the lens microcomputer 109 in combination, it functions as a pre-exposure centering selection switch for setting whether to perform the pre-exposure centering operation.
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 at the time of exposure and an operation of the interchangeable lens 100 in response to the instruction.
First, the operation in the case where the shake correction mode switch 108 is set to the shake correction priority mode when the switch 108 is off will be described.
[0023]
First, the operation of the camera body 112 will be described. Since all operations of the camera body 112 are controlled by the camera microcomputer 113, the operations 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 has been turned on at the timing T100, the communication circuit 116 and 110 communicates with the interchangeable lens 100. Then, an exposure blur correction instruction is issued.
[0024]
When receiving the instruction at T101, the interchangeable lens 100 interprets the instruction. The time from the transmitted instruction to the start of the instructed exposure is T102. The correction lens 102a is moved to the center position of the movable range of the lens within the time from T101 to T102, and after being moved, is held at the center position (centering operation). When the time reaches T102, the 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 regardless of the direction in which the blur correction operation is performed.
[0025]
Thereafter, the user completes the full-press at timing T103, and the camera body 112 performs an exposure operation from timing T102 to T104. When the exposure operation is completed, the camera body 112 issues 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 in the case where the composition priority mode is set when the blur correction mode switch 108 is turned on will be described.
First, the operation of the camera body 112 will be described. Hereinafter, the operation of the camera microcomputer 113 will be described similarly to 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 has been turned on at the timing T100, the communication circuit 116 and 110 communicates with the interchangeable lens 100. Then, an exposure blur correction instruction is issued.
[0027]
In the composition priority mode, after receiving the shake correction during exposure in T100, the centering operation as in the shake correction priority mode is not performed. Therefore, the following exposure operation is performed without changing the composition caused by performing the centering operation and with the composition confirmed by the photographer.
[0028]
During a period from timing T102 to T104, the camera body 112 performs an exposure operation. When the exposure operation is completed, the camera body 112 issues 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 the present embodiment, the blur correction mode switch 108 is provided so that the photographer can freely select the blur correction priority mode or the composition priority mode. Therefore, when the photographer wants to obtain a reliable shake correction effect, the centering operation can be performed by selecting the shake correction priority mode, and the movable range of the correction lens 102a can be set to an appropriate range. When the photographer wants to photograph the composition as it is, the photographing is performed without performing the centering operation by selecting the composition priority mode, but even in this case, the correction lens 102a is out of the movable range. As long as the blur correction operation is performed, the blur correction effect is obtained, and the photographing can be performed with the composition desired by the photographer.
[0030]
(2nd Embodiment)
The second embodiment is a mode in which the method of selecting the shake correction priority mode and the composition priority mode is changed from the first embodiment. Therefore, portions that perform the same functions as in the first embodiment described above are denoted by the same reference numerals, and redundant description will be omitted as appropriate. Also, the operation contents of the shake correction priority mode and the composition priority mode are the same as those of the first embodiment, and thus the description is omitted.
[0031]
The selection (switching) between 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 on the camera body 112. Specifically, when the shooting mode is the manual mode, the composition priority mode is set, and when the shooting mode is the auto mode, the blur correction priority mode is set.
[0032]
The 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 an exposure shake correction start instruction is transmitted from the camera body 112 at the timing of T100 in FIG. 2, it is determined whether to perform shake correction in the shake correction priority mode or to perform shake correction in the composition priority mode. Be instructed.
[0033]
In the present embodiment, the switching between the shake correction priority mode and the composition priority mode is performed according to the setting on the camera body 112 side, so that the shake correction mode switch 108 may not be provided on the interchangeable lens 100. When the interchangeable lens 100 is provided with the shake correction mode switch 108, the setting on the interchangeable lens 100 side or the setting on the camera body 112 side may be arbitrarily set. .
[0034]
According to the present embodiment, since the switching between the shake correction priority mode and the composition priority mode is performed in synchronization with the setting of the shooting mode on the camera body 112 side, the photographer is particularly conscious of the blur correction priority mode and the composition priority mode. Optimum blur correction operation can be performed by simpler operation without switching.
[0035]
(Modified form)
Various modifications and changes are possible without being limited to the embodiments described above, and these are also within the equivalent scope of the present invention.
For example, in each embodiment, an example has been described in which switching between the correction priority mode and the composition priority mode is performed by setting a switch provided on the interchangeable lens 100 or the camera body 112. However, the present invention is not limited to this. May be determined with reference to the value of the EEPROM 104 which is a non-volatile storage unit. In this case, the value of the EEPROM 104 may be referred to when the lens microcomputer is started, the shake correction mode may be determined, and the operation may be performed.
[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 in which a photographic lens is fixed to a 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 or not 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, a centering operation is performed, and when priority is given to composition, photographing can be performed without performing the centering operation. Therefore, the photographing can be performed according to the composition assumed by the photographer, and the drive stroke at the time of blur correction can be sufficiently ensured.
[0038]
(2) Since the setting of the pre-exposure centering selection switch can be arbitrarily changed by the photographer, the photographing desired by the photographer can be easily performed according to the 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, it is possible to perform the optimal blur correction operation without the photographer considering the presence or absence of the centering operation.
[0040]
(4) The setting of the pre-exposure centering selection switch is in accordance with the setting stored in the non-volatile storage unit. Therefore, when no mechanical switch is provided, the setting content can be retained regardless of the presence or absence of power supply. It is possible to improve usability.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of an interchangeable lens and a 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 at the time of exposure and an operation of the interchangeable lens 100 in response to the instruction.
[Explanation of symbols]
Reference Signs List 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 (8)

Shooting optics,
A shake correction optical system that forms at least a part of the imaging optical system, and corrects image blur by changing the optical axis of the imaging optical system;
A blur correction driving unit that drives the blur correction optical system,
A pre-exposure centering selection switch for setting whether or not to perform a pre-exposure centering operation for driving the blur correction optical system to return the optical axis of the photographing optical system to a predetermined reference state before permitting the start of exposure;
Interchangeable lens provided with. The interchangeable lens according to claim 1,
The setting of the pre-exposure centering selection switch can be arbitrarily changed by the photographer,
An interchangeable lens characterized by the following. In the interchangeable lens according to claim 1 or 2,
The setting of the pre-exposure centering selection switch is changed according to the setting of the shooting mode in the mounted camera body,
An interchangeable lens characterized by the following. The interchangeable lens according to any one of claims 1 to 3,
A nonvolatile storage unit that stores the setting of the pre-exposure centering selection switch,
The setting of the pre-exposure centering selection switch is based on the setting stored in the nonvolatile storage unit,
An interchangeable lens characterized by the following. Shooting optics,
A shake correction optical system that forms at least a part of the imaging optical system, and corrects image blur by changing a relative relationship between an optical axis of the imaging optical system and an imaging surface;
A blur correction driving unit that drives the blur correction optical system,
An exposure for setting whether or not to perform a pre-exposure centering operation for driving the blur correction optical system so as to return the relationship between the optical axis of the imaging optical system and the imaging surface to a predetermined reference state before permitting the start of exposure. Front centering selection switch,
Camera system provided with. The camera system according to claim 1,
The setting of the pre-exposure centering selection switch can be arbitrarily changed by the photographer,
Camera system characterized by the following. In the camera system according to claim 1 or 2,
The setting of the pre-exposure centering selection switch is changed according to the setting of the shooting mode,
Camera system characterized by the following. The camera system according to any one of claims 1 to 3,
A nonvolatile storage unit that stores the setting of the pre-exposure centering selection switch,
The setting of the pre-exposure centering selection switch is based on the setting stored in the nonvolatile storage unit,
Camera system characterized by the following.

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