JP3320692B2 - Electronic imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electronic imaging device,
More specifically, the present invention relates to an electronic imaging device having a so-called shift function that enables an imager as an imaging device to be displaced in a direction orthogonal to an incident optical axis.

[0002]

2. Description of the Related Art It is well known that in photography, particularly when photographing a building, it is necessary to correct a difference in magnification due to a difference in distance to each part of a subject. Therefore, conventionally, in order to perform this correction, the relative position of the photographing lens and the film is relatively displaced (hereinafter, referred to as a shift) in a direction orthogonal to the optical axis of the photographing lens, that is, parallel tilt is performed to perform shift photographing. Had gone. In such a shift photographing, in the case of a camera using an image sensor, the shift operation can be performed relatively easily as compared with the case of using the silver halide film.

In view of the above, various proposals have been made regarding tilt photographing by an electronic image pickup device using an image pickup device. First, a solid-state image pickup device disclosed in Japanese Utility Model Publication No. 1-158258 by the present applicant has been proposed. The device moving device proposes a device having a mechanism for tilting and tilting the light receiving surface of the image pickup device with respect to the optical axis of the photographing lens, that is, tilting and shifting in a vertical direction. In addition, a television camera photoelectric conversion surface tilting device disclosed in Japanese Patent Application Laid-Open No. 1-91574 discloses an image pickup tube or an image sensor capable of continuously performing a tilting tilting operation and a parallel tilting operation of an imaging photoelectric conversion surface. The present invention relates to a movable support device.

[0004]

However, in the above-mentioned conventionally proposed apparatus, a technique for shifting a solid-state image pickup device or the like (hereinafter, referred to as an imager) is shown, but it is not suitable for an actual camera. When applied, there were the following problems.

That is, generally speaking, such a camera capable of shift photographing has not yet been satisfactory in terms of usability.

More specifically, the first problem is that when one camera is used not only for shift shooting but also as a normal camera that does not shift, the function as a normal camera is sufficiently performed. It is required that the non-shift state be obtained reliably and promptly. However, since such considerations are not made in the conventional camera, the same shift operation as in the shift photographing ( (Which often tends to be a coordinated and cumbersome act).

A second problem is that, for example, in the case where the shiftable area exists beyond the standard image circle of the lens, it is necessary to shift without deteriorating the image quality or to secure the image quality. It is necessary to judge whether to shift within the range of the image circle (this is particularly easy for a camera with interchangeable lenses, since the image circle differs depending on the lens used). The camera described above has a drawback in that it is not possible to easily know whether or not the information for making this determination, that is, the desired shift, causes the shooting area to deviate from the image circle.

An object of the present invention is to solve the above disadvantages,
An object of the present invention is to provide an electronic imaging device capable of performing shift photographing with improved usability.

More specifically, a first object of the present invention is to
It is an object of the present invention to solve the first problem and to realize an electronic image pickup apparatus capable of performing shift photographing in which a non-shift state equivalent to that of a normal camera can be reliably and promptly obtained. In order to solve the first problem and to obtain the same non-shift state setting as that of a normal camera, there is provided an electronic image pickup apparatus capable of surely and quickly performing this operation with a very simple operation of a photographer. Is to make it happen.

A third object of the present invention is to solve the above second problem and realize an electronic image pickup apparatus which enables a photographer to easily know whether or not a photographing area deviates from an image circle by a desired shift. Is to do.

[0011]

According to the present invention, there is provided an electronic imaging apparatus comprising: an imager for photoelectrically converting a subject image formed by the imaging optical system to be applied; and an imager moving the imager with respect to an optical axis of the imaging optical system. a shift drive <br/> kinematic mechanism displaceable in a direction perpendicular Te, and reset means for resetting the reference position to displace said imager by driving the driving mechanism, the Image
System that specifies shift mode settings that allow
Ri Na and and a readout mode switching means, the shift mode
If the switching means is not set to shift mode,
It is configured to reset the displacement of the imager to the reference position.
It is characterized by having been done . Also, another power supply according to the present invention is used.
The child imaging device manually determines the amount of displacement of the imager.
Further comprising a displacement input means for determining
If the shift mode switching means is not set to shift mode
Reset the imager displacement in
The shift mode is executed regardless of the specification of the force means.
When the switching means is set to the shift mode,
The shift drive corresponding to the designation of the displacement input means is performed.
It is characterized by being comprised so that.

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. FIG. 2 is a block diagram of a control unit of the electronic imaging apparatus according to the first embodiment of the present invention. A system controller 101 composed of a microcomputer controls the apparatus.

The subject photographing light is captured by the imager 32, and the image signal is recorded on a magnetic medium or a solid-state memory by an image recording system 112 including a signal processing circuit such as a process circuit and a recording circuit. Then, the photometric element 102 performs photometry of the photographing light and inputs the photometric light to the system controller 101. The exposure adjustment system 111 for controlling the exposure of the imager 32 includes an aperture actuator 1
03, shutter 104, imaging gain controller 1
05 and a strobe device 106.

The shift mode changeover switch 107 for selecting the mode of normal photographing or shift photographing is constituted by a slide switch, and its common contact is pulled up by the power supply voltage Vcc. A shift volume 108 is used to specify a shift amount when the shift shooting is selected.
The reference voltage Vref is supplied by a slide volume. The output is input to the system controller 101 via the A / D conversion circuit 109. Also, the reference voltage V
The shift position encoder 31e to which ref is supplied detects the position where the imager 32 is shifted, and its output is input to the system controller 101 via the A / D conversion circuit 110.

The ROM table 101a incorporated in the system controller 101 stores reference data for operation of the exposure adjusting system 111 , maximum allowable shift amount data corresponding to the lens used, and the like. Data is read. The shift actuator 72 is connected to the field frame 4 of the imager 32 and the finder optical system 8.
(See FIG. 1) is a drive motor for displacing the shift position to a designated shift position.

Next, the configuration of the photographing optical system of the electronic imaging apparatus according to the present embodiment will be described with reference to FIG. The optical system includes a base block 1 having a first mirror unit 2 having a half mirror, an imaging unit 3 having an imager 32 as an image sensor, and a finder optical system, that is, TTL in this case.
(Through the Taking Lens) An optical system, and a drive unit 7 for shifting and displacing the image pickup unit 3 and the field frame unit 4 of the finder optical system. The finder optical system includes a mat 4 for forming a finder image.
A frame portion 4 supporting the lens 2, a second mirror portion 5 having a half mirror for a finder, a finder portion 8, and a photometric portion 6 .

The details of the structure of the first mirror section 2 are shown in FIG. The first mirror 22, which is a half mirror,
The first mirror 22 is brought into contact with the opening of the mirror receiver 21 via the cushion 24, and the first mirror 22 is pressed by the mirror retainer 23 via the mounting hole 23 a with the screw 25, and
It is fixed obliquely to the surface having 1a.

The first mirror unit 2 is a base block 1
In the mounted state, the incident photographing light (optical axis O in FIG. 1) partially passes through the first mirror 22 and forms an image on the photoelectric conversion surface of the imager 32. I do. Other photographing light is directed in the direction of the optical axis O2 (FIG. 1).
), And forms an image on the finder mat 42 as a finder image.

FIG. 4 shows the details of the structure of the image pickup section 3 . The imager 32, which is a solid-state image sensor, is mounted on the imager mounting window 31a of the support frame 31, and is fixed by screws 34 via a holding plate 33 having screw holes 33a. A guide hole 31b for guiding the shift displacement is provided at the upper part of the support frame 31, and a shaft hole 31c for the guide is provided below. In addition, the said hole 31b,
The axis directions of and 31c are parallel to the photoelectric conversion surface of the imager. Further, a shift drive rack 31d is formed below the support frame 31. The pitch line direction of the rack is parallel to the axial direction. A shift position encoder 31e, which is an electric resistance film for detecting a shift amount, is provided on an upper end surface of the support frame 31.

Next, as shown in FIG. 5, the field frame 4 is provided with a mat 42 attached to a field frame 41a provided on the mat receiver 41, and two claws 4 provided on the mat receiver 41.
1b (one claw is not shown) is locked and fixed. Further, similarly to the image pickup section 3 , the mat receiver 41 has a guide through hole 41c and a shaft hole 41 for shift displacement.
d, and a shift drive rack 41e is provided below. The axial direction of the holes 41c and 41d and the pitch line direction of the rack 41e are arranged to be parallel to each other, and further to be parallel to the image forming surface of the mat 42.

Next, as shown in FIG. 6, the second mirror section 5 is a second mirror 5 which is a half mirror for a finder.
2 is mounted to the mirror opening 51a of the second mirror receiver 51 in a state where the mounting hole 51d is provided obliquely on the surface on which the mounting hole 51d is provided, and is screwed to the screw hole 51b through the mounting hole 53a of the mirror holder 53. It is screwed on and presses and fixes the second mirror. The second mirror receiver 51 is provided with a fitting portion 51c for fitting to the finder portion 8 .

As shown in FIG. 7, the photometric section 6 has a photometric frame 6 having a mounting opening 61a for a photometric element (not shown).
The photometric condenser lens 63 and the filter 62 are attached to each other in a superimposed manner, and are locked and fixed by two claws 61 b provided on the photometric frame 61. The photometric frame 61 is provided with a mounting hole 61c.

FIG. 8 shows the structure of the shift driving section 7 . The shift actuator 72, which is a drive motor, is inserted into a notch 71a provided on a gear mounting plate 71 with a motor gear 73 fixed to an output shaft thereof.
Is fixedly supported via the mounting hole 71i. A shaft 71b for supporting each gear train is provided on the gear mounting plate 71,
71c, 71d, 71e, 71f, 71g, 71h are planted. Note that the shafts 71d and 71h are stepped shafts. The double-row gears 74 and 75 and the gear 76 composed of large and small gears are supported by the shafts 71b, 71c and 71d, respectively, and mesh with each other to form one reduction gear train. Then, double row gear 74 meshes with the Motagiya 73, gear 76 is in its assembled state, the imaging unit 3
With the rack 31d.

The gear 78, the double-row gear 79, 80
And the gear 81 are the shafts 71e, 71f, 71g,
The other reduction gear train is rotatably supported by 71h and meshed with each other. The gear 78 meshes with the motor gear 73, and the gear 81 meshes with the rack 41e of the field frame 4 in the assembled state. The reduction ratio of the two gear trains is set so that the relative positional relationship between the imager 32 and the field frame 41a of the finder optical system with respect to the optical axis O or O2 is fixed, that is, the shift amounts are equal. Value is selected. The retaining of the gear 76 in the axial direction is performed by using a retaining ring 77, and the retaining ring is similarly used for other gears (not shown).

As shown in FIG. 1, the above-mentioned components are sequentially assembled to the base block 1 and the like. First, the first mirror portion 2 is screwed into the base 21 through the hole 21a of the first mirror receiver 21. Fixed to block 1. Then, the imaging unit 3 includes two shaft holes 1 a of the base block 1.
And the two guide shafts 11 of the support member inserted into the blind hole 1b are slidably supported through the through hole 31b and the hole 31c.

The guide shaft 11 is fixed by screwing a screw 15 through a mounting hole 13b and screwing it into a screw hole 1g of the base block 1 to fix the stopper plate 13 and to prevent the stopper plate 13 from holding the shaft. The fixing is performed through the hole 13a.

Similarly, the field frame portion 4 is provided with two shaft holes 1c of the base block 1 in a direction orthogonal to the optical axis O2.
Are supported slidably through two through-holes 41c and 41d by two guide shafts 12 as support members inserted into the blind holes 1d. The guide shaft 12 is fixed by screwing the screw 16 through the mounting hole 14b and screwing it into the screw hole 1h of the base block 1 to fix the stopper plate 14, and through the shaft holding blind hole 14a of the stopper plate 14. Done.

The second mirror portion 5 is fixed to the base block 1 by screwing a screw 55 into a screw hole 1e via a hole 51d of the second mirror receiver 51. Further, the photometric unit 6 inserts the screw 65 into the screw hole 51e through the mounting hole 61c of the photometric frame 61.
And is fixed to the second mirror receiver 51. And
A photometric element 64 is fixed to the element mounting opening 61a of the photometric frame 61. The finder section 8 is supported by a main body of the electronic imaging device (not shown), and its relay lens ring section 8a is fitted into a finder fitting section 51c of the second mirror receiver 51.

The driving section 7 inserts a screw 83 into the base block 1 through a mounting hole 71j of the gear mounting plate 71 and a screw hole 1f.
And is fixedly supported. Gears 76 and 81 driven in conjunction with a shift actuator 72 serving as a drive motor are provided on a rack 31d provided on the support frame 31 of the imaging unit 3 and a mat receiver 41 serving as a support for the visual field frame unit 4. And the racks 41e to be engaged with each other in the attached state.

When the photographing optical system is in the assembled state, as shown in FIG. 1, in a normal use state viewed from the photographer, the direction A indicates the forward direction, the direction B indicates the upward direction, and the direction C indicates the right-hand direction. .

[0032] To describe configured operation of the imaging optical system as described above, firstly, incident on the first mirror unit 2,
A part of the photographing light is reflected on the first mirror 22 in the direction of the optical axis O2, and a finder image is formed on the mat 42.
On the other hand, the photographing light transmitted through the first mirror forms an image on the photoelectric conversion surface of the imager 32. The finder image is reflected on the second mirror 52 and is observed through the finder section 8 . At the same time, a part of the light beam is transmitted by the second mirror 52 and is incident on the photometric element 64 via the condenser lens 63 and the filter 62 of the photometric unit 6 .

The shift operation is performed based on a shift instruction from the system controller 101.
Rotates in the designated direction, and shifts the imager 32 via the gear 76 and the rack 31d. At the same time, the field frame 41a moves while maintaining a predetermined optical positional relationship in conjunction with the imager via the gear 81 and the rack 41e, so that the field of view of the subject does not deviate. In addition, the specific shift direction of the imager 32 and the field frame 41a is that if the imager 32 moves in the direction of arrow G in FIG. 1, the field frame 41a moves in the direction of arrow H.

FIG. 9 is a diagram showing the appearance of the electronic image pickup apparatus of the present embodiment. A lens barrel having a photographic lens 121 is mounted on the camera body 120, and a strobe window 106a is provided on the subject side, and a recording medium entrance 124 is provided in the left direction of the photographer. Further, on the upper surface of the main body 120, a tele / wide zoom switch button 122, a release switch button 123, a display unit 125, a shift mode changeover switch knob 107a, and a shift volume knob 10 are provided.
8a are provided respectively.

Next, the shift mode photographing operation of the camera of the electronic image pickup apparatus of this embodiment will be described with reference to the flowchart of FIG.

First, in step S101, it is checked whether the shift mode changeover switch 107 is set to the shift mode. If the shift mode has not been set, the process jumps to step S108, and the shift state reset operation is performed. That is, when the imager 32 is at the shift position, the imager 3 is moved to a position where the center of the photoelectric conversion surface coincides with the optical axis O regardless of the value of the shift volume 108. Then, in step S109, the shift mode flag F is reset to 0, and the process proceeds to step S105.

On the other hand, if it is determined in step S101 that the shift mode is set, the process proceeds to step S102, and the shift mode flag F is set to 1. Then, in step S103, the shift amount data designated by the shift volume 108 is read, and then, in step S104, the shift drive is performed by the actuator 72 in accordance with the shift amount, and the imager 32 and the field frame 41a are linked. And move. Subsequently, the process proceeds to step S105.

In step S105, it is determined whether the power switch of the camera is on or off. If the power switch is off, the photographing operation is immediately terminated. If it is on, it is determined in step S106 whether the release button 123 has been pressed and the shooting trigger signal has been turned on. If there is no signal, the process returns to step S101 again, and enters a standby state in which the above-described processing is repeated. Then, when an ON signal is output, a shooting sequence by the system controller 101 is executed, and shooting is performed. After that, the process returns to step S101 again to be in a shooting standby state.

As described above, in the shift photographing by the electronic image pickup apparatus according to the present embodiment, the field frame 4 is also shifted in conjunction with the shift operation of the imager 32, so that the subject moves out of the viewfinder. Such a situation is eliminated, and shift photographing can be easily performed.

Although the present embodiment employs a structure in which the imager 32 and the field frame 4 are mechanically linked, it does not necessarily require a mechanical linking system. The gist of the present invention can be applied as it is even in the case where the shift operation is performed by driving using the drive source thus set, that is, in a so-called electrical interlocking system.

Next, an image pickup optical system of an electronic image pickup apparatus according to a second embodiment of the present invention will be described. The shift mechanism of this embodiment differs from that of the first embodiment described above. The features of the shift mechanism are that the shift direction (first direction) of the imager and the branching direction of the finder optical system. By setting the (second direction) to be vertical, the mechanism is simplified.

FIG. 10 is a plan view of an image pickup optical system according to the present embodiment. A frame 90 supports a base block 1 'on which a first mirror 22' is obliquely mounted.
Base plate 99 driven up and down via a drive mechanism above
Includes an imaging unit 3 ', a field frame unit 4 ', and a second mirror 52 '.
The 'a photometric unit 6' a second mirror unit 5 to obliquely disposed and the finder portion 8 'is fixedly supported, respectively. Each component such as the first mirror 22 ′ and the imaging unit 3 ′ is a first
Only the support part is different from that of the embodiment, and the other components are the same. 10 and 11, the direction A indicates the forward direction, the direction B indicates the upward direction, and the direction C indicates the right-hand direction. Then, the imager and the field frame are simultaneously shifted up and down (first direction).

FIG. 11 is a longitudinal sectional view of the photographing optical system shift mechanism in the above embodiment. A shift actuator 91 as a drive motor is driven by
0 is attached. Further, shafts 90a, 90b, 90c for supporting a gear train are implanted in the frame 90, and a boss 90g having an inner diameter portion 90f for supporting the cam cylinder 98 is provided. The boss 90g is provided above the boss 90g. Cam gear 9
There is provided a cam gear fitting portion 90d for pivotally supporting the cam gear 7. A gear 94, a double-row gear 95, and a gear 96 that form a reduction gear train are inserted into the shafts 90a, 90b, and 90c, respectively, and are fixed in the axial direction by a retaining ring 85. The gear 94 meshes with the motor gear 93, and the gear 96 meshes with the cam gear 97. Therefore, the cam gear 97 is driven to rotate by the shift actuator 91.

Further, as shown in FIG. 13 which is a sectional view taken along the line JJ of FIG. 12 and FIG. 11, the cam gear 97 is inserted into the gear fitting portion 90d, and is fixed in the axial direction by the retaining ring 87. It is movably supported. On the other hand, the base plate 99 is fixed by screws 88 via a flange portion 98c above the cam cylinder 98 which is slidably inserted into the boss inner diameter portion 90f. The cam cylinder 98 has a rotation stopping groove 98a, and a protrusion 90e provided on the inner diameter of the boss 90g is fitted into the groove to stop the rotation movement of the cam cylinder 98.

The cylindrical portion of the cam cylinder is provided with three cam grooves 98b having the same lead angle. On the other hand, three drive pins 86 respectively fitted into the grooves 98b are fixed to the inner diameter side of the cam gear 97. Cam gear 9
The cam gear fitting portion 90d into which the gear 7 is fitted needs to escape the drive pin 86 by the width of the rotation range, and has a notched shape. In the shift drive, the cam gear 97 is rotated via a gear train, and the driving pin 86 presses the cam surface of the cam groove 98b of the cam cylinder 98. Therefore, it is displaced in the first direction.
Therefore, the base plate fixed to the cam cylinder 98 is displaced in the first direction in the same manner. That is, it is shifted up and down.

The electric control unit and the like other than the image pickup optical system are the same as those of the first embodiment.

The shift operation of the image pickup optical system of the electronic image pickup apparatus of the present embodiment configured as described above will be described. The actuator 91 is driven by a shift drive instruction from the system controller. Then, the cam gear 97 rotates through the gear train, and the cam cylinder 98 moves upward or downward. As the cam cylinder 98 moves, the base plate 99
The image pickup device 3 'having an imager fixed to and the finder optical system below the field frame portion 4 ' having the field frame are simultaneously driven to shift in the first direction, that is, upward or downward.

As described above, the shift mechanism of the present embodiment is
Unlike the embodiment, two sets of shift mechanisms, one for the imager and one for the finder optical system, are not required, and a single shift mechanism may be used, and simplification of the mechanism and improvement in shift accuracy can be realized.

Next, an electronic image pickup apparatus according to a third embodiment of the present invention will be described. This embodiment relates to a camera having a shift photographing function with a replaceable lens, and its appearance is shown in FIG. FIG. 14 (A),
(B) shows image circles E1 and E2, which are effective imaging screen ranges on the imaging planes K1 and K2 for different photographing lenses L1 and L2, respectively. FIG. 15 shows an allowable shift amount S of the photoelectric conversion surface I of the imager with respect to each of the image circles E0, E1, and E2. If the lens is small and its image circle is E0, no shift is possible, but if the lens is large and its image circle is E1 or E2, the permissible shift amounts are indicated by S1 and S2, respectively. Is the shift allowable range for each photographing lens, that is, the limit data of the displacement area of the imager.

FIG. 16 is an external view of an interchangeable lens type camera to which the electronic image pickup apparatus of this embodiment is applied. The lens mount 130a of the camera body 130 receives information on the image circle of the interchangeable lens. A contact group 132 as information recognition means is provided. Further, the mounting portion of the interchangeable lens barrel 131 mounted on the camera and having the taking lens 131a is mounted on the taking lens 131.
A contact group 133, which is a display means for displaying information related to the image circle a, is provided. These contact groups 13
3, the image circle information is given by data such as the presence or absence of a contact or the resistance value between the contacts. Note that the contact groups 132 and 133 may employ a mechanical detection mechanism based on unevenness, or may employ an optical sensor, a magnetic sensor, or the like.

FIG. 17 shows only a portion of the block diagram of the control section of the camera of the present embodiment which is different from that of the first embodiment. The signals of the contact groups 132 and 133 of the image circle information identification means are input to the lens information decoder circuit 134 and coded. The coded image circle information is input to the system controller 135. The ROM table 135a incorporated in the system controller 135 stores the limiter data of the imager displacement area corresponding to the image circle information. When the lens is mounted, the data is read out and set as the maximum shift amount.

It should be noted that the same components as those of the first or second embodiment described above are applied to the shift drive mechanism of the photographic optical system of the present embodiment.

The operation of the electronic imaging apparatus according to the present embodiment configured as described above will be described with reference to the flowcharts of FIGS.

First, when the interchangeable lens barrel 131 is mounted on the camera body 130 or when the power switch of the camera is turned on, a subroutine for setting the maximum shift amount shown in FIG. 22 is called. The image circle information of the corresponding interchangeable lens is used as the contact group 132, 1
33 (step S201). Subsequently, in step S202, the ROM table 135 is read.
The shift limit data corresponding to the image circle recorded in the area a is read out, set as the maximum shift amount, and the routine returns.

Subsequently, a shift photographing process as shown in FIG. 21 is started, and the process is the same as that of the first embodiment. However, step S
In the process of driving the shift actuator 104, if the above-mentioned maximum shift amount is always referred to and there is a designation exceeding the shift amount, a display indicating that shift is not possible or a warning is issued and shift shooting is not performed.

The shift restriction data corresponding to the image circle information may be stored in a ROM provided in the interchangeable lens. At the time of shift photographing, the shift restriction data, not the image circle data, is transferred from the interchangeable lens side. The data may be directly taken into the system controller.

Usually, the size of the image circle of the interchangeable lens for a single-lens reflex camera for 35 mm is sufficiently larger than the photoelectric conversion surface of the imager of the electronic imaging apparatus. From this, it is possible to divert the 35 mm interchangeable lens already developed as an interchangeable lens for shift photographing of an electronic imaging device using an imager. In such a case, if the electronic imaging device of the present embodiment is applied, it is a more preferable application example.

Further, the camera of this embodiment can be applied to a camera whose viewfinder is an electronic viewfinder (EVF). In this case, the finder is not mechanically driven as described above, but the subject image on the imager is the finder according to the shift.
It is displayed on a display such as a CD. Then, the shift amount is restricted according to the photographing lens.

Next, an electronic image pickup apparatus as a reference example of the present invention will be described.

Normally, the shift photographing uses the peripheral portion of the image circle, so that deterioration of the image quality is inevitable due to the performance of the photographing lens. Therefore, this reference is intended to improve the above-described performance degradation by further narrowing down the shift shooting than in the normal shooting. In the case where the aperture is narrowed down as described above, the amount of light is naturally insufficient. However, unlike an electronic imaging apparatus using an imager, unlike a camera using a film, it is possible to increase the gain of a signal amplifier circuit of the imager. Therefore, in this reference, the shortage of the light amount is compensated by the operation as needed.

As the shift mechanism of the image pickup optical system of the present embodiment, the same shift mechanism as that of the first and second embodiments is applied.
Also, the components of the first or second embodiment are similarly applied to each element of the control device.

The shift photographing operation of the electronic image pickup apparatus of the present embodiment will be described with reference to the flowcharts of FIGS. The shift photographing process is performed based on the flowchart of FIG. 21 similarly to the case of the first embodiment described above, but prior to executing the photographing sequence in step S107, the shift photographing mode as shown in FIG. The switching subroutine for selecting whether or not to perform the exposure control processing corresponding to the shift photographing, which selects the photographing processing means (photographing program) based on the recognition of the setting recognition means, is called. Then, in step S301, the shift mode flag F set in step S102 or step S109 of the subroutine process of the flowchart in FIG. 21 is determined, and if the flag F is 0, that is, the normal shooting mode, the process proceeds to step S303. Jump is made, normal processing for performing normal shooting is selected, and the routine returns.

On the other hand, if the flag F is 1, that is, if the mode is the shift photographing mode, the flow advances to step S302 to select a narrowing-down process for photographing adapted to the shift photographing, and returns. The aperture-down process relates to control of exposure adjustment, and an imaging sequence in which the aperture actuator 103 shown in FIG. 2 works to further reduce the aperture than the normal aperture and sets the shutter speed to a predetermined amount lower. Is adopted. Further, as a modified example, it is also possible to adopt an imaging sequence that copes with a decrease in the amount of light due to the aperture stop by increasing the gain of the imaging signal of the imager by the imaging gain controller 105.

FIGS. 18 and 1 show the dimming control of the normal processing and the narrowing-down processing of the above-described photographing sequence.
This will be described in detail with reference to FIG.

FIG. 18 is a diagram showing the relationship between the subject brightness Bv and the appropriate setting aperture value F during normal shooting, which is a normal process, using the shutter time T as a parameter. In step S303 of FIG. 23, the aperture and the shutter speed are determined along the solid line in the figure. In this example, the aperture value F is 2.8 to 16, and 1 /
60 to 1/1000 second is selected, and the photographing gain is set to ISO100. However, if necessary, ISO20
A high gain of 0 can be set. In this normal processing, a relatively high-speed shutter is set in consideration of the movement of the subject and the effects of camera shake.

Next, the diagram of the appropriate aperture value in FIG. 19 is shown in FIG.
This shows the aperture value and the shutter speed setting value for the aperture process selected and designated in step S302 of the flowchart of FIG. 3, and is set by narrowing down compared to the normal process, greatly improving the image quality around the screen. It can be improved. However, if the aperture is stopped down too much, the image quality will be degraded due to the diffraction effect of light. Therefore, according to this setting example, the range of the aperture value is limited to F5.6 to 11, and the best image quality is obtained without increasing the imaging gain.

The diagram of the appropriate aperture value in FIG. 20 shows the aperture value and the set value at the time of shutter release for the modification of the aperture process selected and specified in step S302 of the flowchart in FIG. In the modification, when the subject brightness Bv is a predetermined value, for example, a value of 9 or less, the imaging gain of the imager can be set to be higher than that of ISO200, and the corresponding shutter speed can be set to be higher. . Therefore, according to the present modification, even if the subject has a considerably low luminance without camera shake or the like, it can be photographed without using a strobe.

The camera of this modification can be applied to a camera whose viewfinder is an electronic viewfinder (EVF).

[0069]

As described above, according to the present invention, it is possible to obtain a camera capable of performing shift photographing with improved usability.

In particular, according to the first aspect of the present invention, it is possible to realize an electronic imaging apparatus capable of performing shift photographing in which the setting of the non-shift state equivalent to that of a normal camera can be obtained reliably and promptly.

Further, according to the second aspect of the present invention, in obtaining a non-shift state setting equivalent to that of a normal camera, an electronic operation that can be performed reliably and quickly by a simple operation like a photographer. An imaging device can be realized.

Further, according to the third aspect of the present invention, it is possible to realize an electronic image pickup apparatus that allows a photographer to easily know whether or not a photographing area deviates from an image circle due to a desired shift.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an imaging optical system of the electronic imaging apparatus of FIG.

FIG. 2 is a block diagram illustrating a control unit of the electronic imaging apparatus according to the first embodiment of the present invention;

FIG. 3 is an exploded perspective view of a first mirror unit of the imaging optical system of FIG. 1;

FIG. 4 is an exploded perspective view of an imaging unit of the imaging optical system of FIG. 1,

FIG. 5 is an exploded perspective view of a field frame of the imaging optical system of FIG. 1;

FIG. 6 is an exploded perspective view of a second mirror unit of the imaging optical system of FIG. 1;

FIG. 7 is an exploded perspective view of a photometric unit of the imaging optical system of FIG. 1;

FIG. 8 is an exploded perspective view of a shift drive unit of the imaging optical system of FIG. 1;

FIG. 9 is a perspective view showing an appearance of a camera of the electronic imaging apparatus in FIG. 2;

FIG. 10 is a plan view of an imaging optical system of an electronic imaging apparatus according to a second embodiment of the present invention;

FIG. 11 is a longitudinal sectional view of a shift driving unit of the imaging optical system of FIG. 10;

FIG. 12 is an exploded perspective view of a main part of the shift drive unit in FIG. 11;

FIG. 13 is a sectional view taken along the line JJ of FIG. 11;

FIGS. 14A and 14B are diagrams each showing an image circle of a photographing lens;

FIG. 15 is a diagram showing a relationship between an image circle and a shift limit amount;

FIG. 16 is a perspective view of a camera and an interchangeable lens of an electronic imaging apparatus according to a third embodiment of the present invention;

17 is a block diagram of a main part of a control unit of the camera in FIG. 16,

FIG. 18 is a diagram showing an appropriate aperture and shutter time applied to a normal photographing process of a photographing process of the electronic image pickup apparatus as a reference example of the present invention;

FIG. 19 is a diagram showing an appropriate aperture and a shutter time which are applied to the narrowing-down photographing process of the photographing process of the electronic image pickup apparatus of FIG. 18;

FIG. 20 is a diagram showing an appropriate aperture and a shutter speed applied to a modification of the narrowing-down photographing process of the photographing process of the electronic imaging apparatus in FIG. 18;

FIG. 21 is a flowchart of shift photographing processing of the electronic image pickup apparatus of FIG. 2;

FIG. 22 is a flowchart of a subroutine for setting a maximum shift amount in the photographing process of the camera in FIG. 16;

FIG. 23 is a flowchart of a shift corresponding exposure control process switching subroutine in the photographing process of the electronic imaging apparatus of FIG. 18;

[Explanation of symbols]

7: Drive unit (drive mechanism) 32: Imager S108: Reset means 107: Shift mode changeover switch (shift mode changeover means) 108: Shift volume knob (displacement amount input means) 132, 133 ... Contact group (information recognition means) E0 , E1, E2 ... Image circle 135a ... ROM table (maximum shift amount setting means)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-76384 (JP, A) JP-A-63-197926 (JP, A) JP-A-62-66774 (JP, A) JP-A 60-1979 134671 (JP, A) JP-A-1-91574 (JP, A) JP-A-1-134350 (JP, A) JP-A-59-1007 (JP, U) JP-A-55-108424 (JP, U) 58-73680 (JP, U) Hikaru 2-130167 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 5/00-5/08 G03B 13/26

Claims (2)

(57) [Claims] An imager for photoelectrically converting a subject image formed by the imaging optical system to be applied; a shift drive mechanism capable of displacing the imager in a direction perpendicular to an optical axis of the imaging optical system; Reset means for driving the drive mechanism to reset the displacement of the imager to a reference position; and shift mode switching means for designating a shift mode allowing the displacement of the imager. An electronic imaging apparatus, wherein the displacement of the imager is reset to a reference position when the means is not set to the shift mode. 2. The apparatus according to claim 1, further comprising a displacement input means for manually designating the displacement of the imager, wherein the displacement of the imager is reset when the shift mode switching means is not set to the shift mode. The shift driving is executed irrespective of the designation of the amount input means, and when the shift mode switching means is set to the shift mode, the shift drive corresponding to the designation of the displacement amount input means is performed. Claim 1.
An electronic imaging device according to claim 1.