JPH09211520A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a photographer to visually recognize the occurrence of the shake of a camera main body caused by camera shake, etc., by providing a camera with a driving means for decentering the part of lens groups constituting a finder system in accordance with the shake of the camera main body. SOLUTION: A lens 108 is attached to one end of each supporting bar 111, and a weight 113 is attached to the other end respectively, and each bar 111 has a rotatable structure centering a fulcrum 112 in the intraface of paper in figure. When the shake is caused by the camera shake, etc., on the camera main body, the weight 113 spatially stands still by the behavior of inertia force. That is, a lens 108 is shifted (decenter) in a direction nearly perpendicular to an optical axis 103 centering the fulcrum 112 of the bar 111. As a result, the image blur of an object image observed through the finder system 102 is emphasized, so that the photographer can visually recognize the shake of the camera main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera capable of visually informing a photographer of camera shake caused by camera shake or the like.

[0002]

2. Description of the Related Art In recent years, automation of camera operation has been advanced. As a result, the failure of shooting due to out-of-focus (defocus) has been eliminated by the autofocus function, for example. In addition, the automatic exposure function has eliminated the failure of shooting in which an appropriate exposure cannot be obtained.

By the way, in video cameras, still cameras, and the like, the number of high-zoom zoom lenses having a zoom ratio of more than 3 is increasing, and it becomes possible to shoot over a wide focal length range from a wide-angle range to a telephoto range. Is coming. In particular, the longer the focal length is, the more powerful a photograph can be taken, which is closer to the subject. Therefore, the focal length at the telephoto end is becoming longer. On the other hand, improvements in lens processing technology, lens barrel processing technology, and the like have led to improvements in lens performance.

[0004]

As the taking lens system becomes longer in focus, a large amount of image blur occurs due to the blur of the camera body. As a result, in the related art, it is easy to cause a failure in shooting due to the camera body blurring.

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a camera that allows a photographer to visually recognize occurrence of camera shake caused by camera shake or the like. To aim.

[0006]

In order to solve the above-mentioned problems, in the first invention of the present invention, a taking lens system for forming an image of a subject and a finder system for observing the subject are provided. In a provided camera, in order to emphasize image blur of the subject image observed through the finder system with respect to the camera body, a part of the lens groups constituting the finder system is provided in the camera body of the camera body. A camera provided with a drive unit for eccentricity according to blurring.

According to a preferred aspect of the first aspect of the present invention, the finder system and the taking lens system have different optical axes spaced from each other, and the finder system sequentially images the subject from the subject side. And an eyepiece lens system for magnifying and observing the image of the subject formed through the objective lens system, and the drive means constitutes the objective lens system. At least one lens group of the lens groups is decentered.

According to a second aspect of the present invention, in a camera including a taking lens system for forming an image of a subject and a finder system for observing the subject, the taking lens system is An optical system capable of shifting an image by decentering a part of lens groups constituting the photographing lens system and correcting image blur caused by camera shake by shifting the image. Yes,
To enhance the image blur of the subject image observed through the viewfinder system with respect to the camera body only when the camera body shake occurs but the image blur is not corrected in the taking lens system. Further, there is provided a camera including a driving means for eccentricizing a part of the lens groups constituting the finder system according to the shake of the camera body.

According to a preferred aspect of the second aspect of the present invention, the finder system and the taking lens system have different optical axes spaced from each other, and the finder system sequentially images the subject. And an eyepiece lens system for magnifying and observing the image of the subject formed through the objective lens system, and the drive means constitutes the objective lens system. At least one lens group of the lens groups is decentered.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Generally, cameras are classified into TTL-finder type cameras and non-TTL-finder type cameras. In the TTL-finder type camera, the optical axis of the taking lens system and the optical axis of the finder system overlap each other. On the other hand, in the non-TTL-finder type camera, the optical axis of the taking lens system and the optical axis of the finder system are separated from each other.

In the TTL-finder type camera, the finder system is arranged on the rear side of the taking lens system (on the side opposite to the subject). The viewfinder system is composed of a prism for inverting the subject image by the taking lens system and an eyepiece lens system for magnifying and observing the subject image by the taking lens system to form the subject image at a position where the photographer can easily see. Let

In a non-TTL-finder type camera,
It is classified into a real image type finder system and a virtual image type finder system. The real image finder system consists of an objective lens system with an optical axis different from that of the taking lens system, a prism for inverting the image by the objective lens system, and an eyepiece lens system for magnifying and observing the image by the objective lens system. Composed. On the other hand, in the virtual image finder system, the image of the objective lens system is directly relayed by the eyepiece lens system to form a virtual image at a position where it is easy to observe magnified. As described above, in the real image finder system, the real image is once formed by the objective lens system, and the real image is observed through the eyepiece lens system.
On the other hand, in the virtual image finder system, an image formed by the objective lens system is directly relayed by the eyepiece lens system to form a virtual image.

By the way, it is possible to some extent to visually recognize, through the viewfinder system, a large blur of the camera body, which obviously causes a failure in photographing. However, it is generally not possible to visually recognize, through the finder system, a small blur of the camera body that barely causes a substantial image blur on the film surface. Increasing the magnification of the finder system can be considered as a method of visually recognizing camera shake that is small to some extent. in this case,
It is necessary to increase the focal length of the objective lens system or shorten the focal length of the eyepiece lens system. However, increasing the focal length of the objective lens system leads to an increase in size of the finder system. Further, if the focal length of the eyepiece lens system is shortened, sufficient eye relief cannot be ensured, and as a result it becomes difficult to construct a camera.

Therefore, in the present invention, when the camera body is shaken due to camera shake or the like, some of the lens groups forming the finder system are decentered according to the camera shake. In this way, by emphasizing the image blur of the subject image observed by the viewfinder system with respect to the camera body, the photographer can easily visually recognize the blur of the camera body. As a result, the photographer can perform good shooting while realizing a state in which the image blur emphasized through the finder system cannot be visually recognized, that is, a state in which there is no harmful camera shake.

When eccentricizing a part of the lens group of the finder system, if the eccentric drive amount necessary to shift the image by a predetermined amount with respect to a predetermined blur angle of the camera body becomes extremely large, the drive mechanism becomes complicated. This leads to a reduction in space and saves space. On the contrary, if the eccentric drive amount necessary to shift the image by a predetermined amount becomes extremely small, it becomes difficult to control the position for the eccentric drive. For this reason, when the camera body blurring that causes harmful image blurring on the film surface occurs, the eccentric drive amount necessary to blur the image by the finder system by a predetermined amount is set to an appropriate value. Is desirable. In the finder system,
If the lens closest to the photographer is decentered, the driving mechanism becomes complicated. Therefore, it is desirable to decenter the lens group on the subject side relative to the lens on the most photographer side.

By the way, the present invention can be applied to a camera capable of image blur correction. A camera capable of image blur correction is equipped with a photographing lens system capable of shifting an image while suppressing deterioration of optical performance by decentering a part of the lens groups constituting the photographing lens system. There is. Then, the camera body shake due to camera shake etc. is detected, and the predetermined lens group in the taking lens system is eccentric by the correction amount necessary to correct the image shake (image position fluctuation) caused by the detected shake. Let As a result, the image can be shifted by a predetermined amount to correct the blurring of the image. In this way, the image blur correction function is to shift the image by eccentricizing a predetermined lens group temporarily only when a blur of the camera body is detected or continuously based on the detected blur information. This is a function to correct image blur by.

According to the present invention, in such a camera capable of image blur correction, when the image blur correction function is stopped based on the intention of the photographer, or when a blur exceeding the image blur correctable range occurs. If it occurs, a part of the lens group of the finder system is appropriately decentered. That is, according to the present invention, by emphasizing the image blur of the subject image observed through the viewfinder system, the photographer is urged to need the image blur correction function, or the camera body is allowed to have a small blur. Then, it is possible to prevent the shooting failure.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram schematically showing a configuration of a camera according to a first embodiment of the present invention, and is a cross-sectional view cut so as to pass through an optical axis of a taking lens system and an optical axis of a finder system. . 2 is a viewfinder system 1 shown in FIG.
It is a figure which shows the structure of 02 roughly, (a) is a top view, (b) has shown the side view, respectively.

The camera of FIG. 1 comprises a camera body 1 and an optical axis 3.
And a viewfinder system 102 having an optical axis 103. The light beam that has entered the taking lens system 2 attached to the lens mount 15 of the camera body 1 enters the quick return mirror 11 after passing through the taking lens system 2. The central portion of the quick return mirror 11 is a half mirror. Therefore, when the quick return mirror 11 and the auxiliary mirror 12 are in the normal state shown by the solid line in the figure, the light reflected by the quick return mirror 11 is finder system 10.
The light guided in the direction 2 and transmitted through the quick return mirror 11 is reflected by the auxiliary mirror 12, and the focus detection system 2
It is guided in the direction of 1.

On the other hand, when the quick return mirror 11 and the auxiliary mirror 12 are in the photographing state shown by the broken line in the figure,
The light ray that has passed through the taking lens system 2 is guided in the direction of the film surface 4 via the focal plane shutter 13. The light flux reflected by the quick return mirror 11 once forms an image on the screen 114, and then enters the condenser lens 105. Condenser lens 105
After being reflected by the pentaprism 104 a plurality of times, the light passing through the lens reaches the photographer's eye through the eyepiece lens 106.
Here, the penta prism 104 is an erecting optical system for converting an inverted image into an erect image. On the screen 114, a field frame indicating the shooting range is drawn. The portion other than the photographing range is black, and the size of the field frame substantially corresponds to the size of the photographing screen.

In the first embodiment, when the camera body shakes due to camera shake or the like, a part of the lenses constituting the eyepiece lens system 106 is decentered with respect to the optical axis 103.
In this way, by emphasizing the image blur of the subject image observed through the viewfinder system 102, the photographer is visually informed of the blur of the camera body. Hereinafter, the configuration of the finder system 102 will be described in detail with reference to FIG.

As shown in FIG. 2, the eyepiece lens system 106
Is composed of three lenses 107 to 109 in order from the object side. Lens 107 and lens 109
Are held in the lens chamber 110. On the other hand, the lens 108 is held in the lens chamber 115. The lens chamber 115 is cantilevered by two support rods 111. A lens 108 is attached to one end of each support rod 111, and a weight 113 is attached to the other end thereof. Each support rod 111 has a fulcrum 112 as a center.
The structure is rotatable within the plane of FIG.

When the camera body shakes due to camera shake or the like, the weight 113 tries to stand spatially due to the action of inertial force. That is, the lens 108 shifts (decenters) in a direction substantially perpendicular to the optical axis 103 about the fulcrum 112 of the support rod 111. As a result, the image blur of the subject image observed through the viewfinder system 102 is emphasized, and the photographer can visually recognize the blur of the camera body. In this case, the image blur of the subject image occurs in the blur direction of the camera body. On the other hand, in a state where the camera body is not shaken, the image of the subject image is not shaken and the subject image is observed in a stationary state.

Table (1) below shows the specifications of the eyepiece system 106 of the finder system 102 in the first embodiment.

[Table 1] Focal length of whole eyepiece +81.039 Focal length of each lens Use magnification Lens 107 -45.412 +0.3705 Lens 108 +22.949 -2.4681 Lens 109 -74.111 0

In the first embodiment, the virtual image position of the real image formed by the taking lens system 2 is set to infinity by the eyepiece lens system 106. Therefore, the camera shake angle
Then, the blur amount δk of the virtual image is expressed by the following equation (1). δk = 81.039 · tan ε (1)

By the way, a blur amount δs of a virtual image when the lens 108 is decentered (shifted) in a direction perpendicular to the optical axis 103.
Is expressed by the following equation (2), where Δ is the shift amount of the lens 108. δs = (1 + 1 / 2.4681) ・ (1 / 0.3705) ・ Δ ＝ 3.7926 ・ Δ (2)

In the first embodiment, the length from the fulcrum 112 of the support rod 111 to the holding portion of the lens 108 is 20 mm.
It is. Therefore, the shift amount Δ of the lens 108 with respect to the optical axis 103 is expressed by the following equation (3). Δ = 20 · tan ε (3)

From the above equations (2) and (3), the blur amount δs of the virtual image is expressed by the following equation (4). δs = 75.852 · tan ε (4)

As described above, in the first embodiment,
The virtual image shifts (image blur) in the same direction as the camera body. As a result, the total blur amount δ of the virtual image observed when the camera body shakes is determined by the blur amount δk of the virtual image caused by the camera body blur and the optical axis 103 of the lens 108.
And the blur amount δs of the virtual image due to the shift. That is, the total blur amount δ of the observed virtual image is represented by the following equation (5). δ ＝ δk ＋ δs ＝ 156.891 ・ tanε (5)

As shown in equation (5), in the first embodiment,
The blur amount of the subject image observed in the finder system 102 is emphasized to almost twice the normal blur amount by the shift of the lens 108 with respect to the optical axis 103. Therefore, the photographer can easily see the blur of the camera body through the finder system 102.

In the first embodiment, the support rod 11
The length from the fulcrum 112 of No. 1 to the holding portion of the lens 108 is set to 20 mm, which is relatively short. Therefore, the lens 1
The blur amount of the virtual image due to the shift of 08 is about the same as the blur amount of the virtual image due to the camera body blur. However, by appropriately setting the length from the fulcrum 112 of the support rod 111 to the holding portion of the lens 108, the image blur of the subject image can be further emphasized and the blur of the camera body can be more easily visually recognized. It is also possible to do so.

Further, in the first embodiment, as shown in FIG. 2, the lens 108 can be shifted in the direction parallel to the paper surface, but cannot be shifted in the direction perpendicular to the paper surface. Has been done. This is usually the case when shooting with the camera in the normal position, and with the camera in the normal position, even if the camera body shakes in the direction parallel to the paper surface, the camera body shakes in the direction perpendicular to the paper surface. This is because there is little to do. Of course, the lens 108 can be configured to be shiftable not only in the direction parallel to the paper surface but also in the direction perpendicular to the paper surface in consideration of shooting in the vertical position of the camera.

FIG. 3 is a conceptual diagram for explaining the image blur correction function of the camera of the second embodiment of the present invention. Further, FIG. 4 is a diagram schematically showing the configuration of the finder system of the second embodiment, in which (a) is a top view and (b) is a side view. The second embodiment is an embodiment in which the present invention is applied to a camera having an image blur correction function, and the specific configuration of the camera of the second embodiment is similar to that of the first embodiment. Therefore, in FIG. 4, elements having basically the same functions as those of the components of the first embodiment are shown in FIGS.
The same reference numerals as in FIG.

As shown in FIG. 3, in the taking lens system of the camera of the second embodiment, the image can be shifted by shifting a part of the lens group constituting the lens system in a direction substantially perpendicular to the optical axis. Various lens systems are used. In addition, the camera of the second embodiment is provided with an angular velocity sensor for detecting camera shake of the camera body. Further, a correction amount calculation CPU for calculating a correction amount necessary for correcting the image blur based on the blur information output from the angular velocity sensor is provided in the lens barrel that holds the photographing lens system. Has been. Then, based on the output from the correction amount calculation CPU, the drive system shifts a predetermined lens group by the correction amount to correct the image blur caused by the blur of the camera body.

The structure of the finder system of the first embodiment is changed to the second structure.
When it is applied to the camera with the image blur correction function of the embodiment as it is, when the camera body shakes, whether or not the image blur is corrected by the photographing lens system, the eyepiece lens system 1
The No. 06 lens 108 shifts with respect to the optical axis, and the image blur of the subject image is inevitably emphasized. As a result, it is not possible to determine whether the image blur is corrected or not corrected by the taking lens system only by observing the subject through the finder system.

Therefore, in the second embodiment, as shown in FIG. 4, for example, the weight 113 is composed of magnets whose magnetic poles are aligned in the direction indicated by NS in the figure, and faces the north pole and the south pole of the weight 113. The pair of coils 116 are arranged so that Then, in a state where the image blur is corrected by the taking lens system, a current having a predetermined size and direction is applied to the coil 116, and the weight 113 is moved by the magnetic force generated between the coil 116 and the weight 113. Fix it to the camera body. That is, when the image blur is corrected by the taking lens system, the lens 108 of the eyepiece lens system 106 is fixed to the camera body. As a result, the photographer can visually confirm, through the finder system, that the image blur has been corrected by the taking lens system even if the camera body is blurred.

On the other hand, in the state where the camera body is blurred but the image blur is not corrected by the taking lens system,
A current having a predetermined size and direction is passed through the coil 116, which is a drive system of the weight 113, to cause the coil 116 and the weight 113 to move.
Due to the action of the magnetic force generated between the weight 113 and the fulcrum 1
It is rotationally driven around 12. That is, in the state where the camera body is blurred but the image blur is not corrected by the taking lens system, the lens 1 of the eyepiece lens system 106
08 is driven in a direction substantially perpendicular to the optical axis. As a result, the image blur of the subject image observed through the viewfinder system is enhanced according to the blur of the camera body. Therefore, the photographer can visually confirm through the viewfinder system that the image blur has not been corrected by the taking lens system even though the viewfinder camera body is blurred.

In the above description, the current is passed through the coil 116 to forcibly drive the weight 113 when the image blur is not corrected by the taking lens system. However, similarly to the first embodiment, in the second embodiment as well, the subject image in which the image blur is emphasized is passed through the viewfinder system based on only the action of the inertial force of the weight 113 without passing the current through the coil 116. Can be observed.

If the image blur correction is always performed while the power of the camera is ON, the power consumption becomes large. Therefore, for example, when the shutter button is pressed halfway down, image blur correction can be performed. Further, the lens 108 of the eyepiece lens system 106 is not displaced with respect to the camera body when the camera body is not shaken. Therefore, in a state where the camera body is not shaken, it is not necessary to supply a current to the coil 116 in order to save power consumption.

Also, in the second embodiment, as shown in FIG. 4, the lens 108 cannot be shifted in the direction perpendicular to the paper surface, but the lens 108 can also be shifted in the direction perpendicular to the paper surface. Can be configured to. When the lens 108 is configured to be shiftable in any direction, FIG.
As shown in FIG.
A structure for supporting the lens 108 can be adopted. Here, in FIG. 5, (a) is a side view,
(B) has shown the front view, respectively. In FIGS. 5A and 5B, the lens 108 is the lens holder 11
The lens holder 116 is spatially fixed by an elastic body 130. Four magnets 131 are provided on the outer peripheral portion of the lens holder 116, and four coils 132 are provided so as to face each of the four magnets 131. By the way, when the camera shake is generated but the image shake correction is not performed, it is possible to drive the lens 108 by passing a current through the coil 132. In addition, in the configuration of FIG.
It is also possible to shift the lens 108 according to the blur direction of the camera body, or change the shift amount of the lens 108 according to the blur amount of the camera body.

Furthermore, the minimum blur amount of the camera body that can be recognized as a substantial image blur on the film surface changes depending on the focal length of the taking lens system. Therefore, the CPU for correction amount calculation takes in information about the focal length of the taking lens system, and drives the lens 108 only when the blurring amount equal to or more than the minimum blurring amount that causes a substantial image blurring on the film surface occurs. It is also possible to make the photographer visually recognize the harmful blur of the camera body by emphasizing the image blur of the subject image observed through the viewfinder system.

FIG. 6 is a perspective view schematically showing the structure of a camera according to the third embodiment of the present invention. Also, FIG.
FIG. 7 is a cross-sectional view taken along the optical axis of the taking lens system and the optical axis of the finder system in FIG. 6. The camera shown in FIG. 6 includes a camera body 1. The camera body 1 includes a photographic lens system 2 having an optical axis 3 and a finder system 102 having an optical axis 103 spaced apart in parallel with the optical axis 3.
Are provided. A strobe 30 is provided on the front side (subject side) of the camera body 1.

In FIG. 7, the taking lens system 2 comprises, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. ,
The zoom lens includes five lens groups, a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a negative refractive power. Then, at the time of zooming from the wide-angle end to the telephoto end, each lens group moves to the object side while changing the mutual distance. The zoom lens in the present embodiment is the same as that disclosed in the specification of Japanese Patent Application No. 7-237781 and the drawings filed by the present applicant.

The fourth lens group G4 includes three lenses L4.
1, L42 and L43. And
The lenses L41 and L43 are fixed in the lens chamber B1, and the lens L42 is held in the lens chamber B2. As shown in FIG. 8, the lens chamber B2 is cantilevered by four flexible support rods 130, and two magnets 131 are provided on the outer peripheral portion of the lens chamber B2. Lens room B1
Two coils 132 are provided on the inner wall of the so as to face each of the two magnets 131. Therefore, a current is passed through the coil 132 to generate a magnetic field, and the magnet 131
The magnetic force between the coil and the coil 132 causes the lens L42
Can be agitated with respect to the optical axis 3 (oscillating). The support rod 130, the magnet 131, and the coil 1
The positional relationship with 32 is shown in FIG. 8, and it is not accurate to show the support bar 130, the magnet 131, and the coil 132 on the same paper surface in FIG. However, in order to simplify the description, in FIG. 7, the support bar 130, the magnet 131, and the coil 132 are shown on the same paper surface.

Further, as shown in FIG. 7, the finder system 102 includes an objective lens system 204 and an objective lens system 204 in order from the subject side.
It is composed of a visual field frame 206 and an eyepiece lens system 205. The objective lens system 204 is composed of lenses g1 to g3 and a condenser lens gc in order from the subject side. The eyepiece lens system 205 includes a prism P and an eyepiece g4.
At the time of zooming from the wide-angle end to the telephoto end, the lens g2 moves to the object side (subject side) as a lead group, and the lens g1
As a compensator moves in the optical axis direction to keep the image plane position constant. In the third embodiment, the objective lens system 20
By shifting the lens g3 in 4 in the direction substantially perpendicular to the optical axis, the image blur of the subject image is emphasized according to the blur of the camera body.

FIG. 9 and FIG. 10 are diagrams schematically showing the construction of the shift mechanism of the lens group g3 in the finder system of the third embodiment. As shown in FIGS. 9 and 10,
The lens group g3 is held by the lens holder 120, and the lens holder 120 is spatially substantially fixed by the four springs 121. Further, as clearly shown in FIG. 10, two magnets 122 are provided on the outer peripheral portion of the lens holder 120, and two coils 123 are arranged so as to face each of the two magnets 122.

Therefore, when the image blur is not corrected in the taking lens system 2, the lens group g3 is perpendicular to the optical axis 103 based on the amount of blur of the camera body detected through the angular velocity sensor (not shown). It drives in a predetermined direction and shifts the subject image formed by the objective lens system with respect to the optical axis 103. That is, when the image blur is not corrected in the taking lens system 2, the image blur of the subject image observed through the finder system 102 is emphasized according to the blur amount of the camera body. Thus, when the camera body is blurred but the image blur is not corrected, the photographer visually recognizes the camera body blur by observing the image blur of the emphasized subject image through the viewfinder system. be able to.

Table (2) below shows the specifications of the finder system in the third embodiment.

[Table 2] [Objective lens system] Focal length of each lens Use magnification (wide-angle end) Use magnification (telephoto end) Lens g1 -17.350 0.0 0.0 Lens g2 +15.150 -0.5115 -1.9549 Lens g3 -37.941 +2.0017 +2.0017 Lens gc +26.076 +0.6750 +0.6750 Principal point interval (wide-angle end) Principal point interval (telephoto end) Zoom interval d1 27.4172 5.5496 Zoom interval d2 3.9130 25.7805 Zoom interval d3 25.4508 25.4508 [Eyepiece system] Focal length lens g4 +24.260 [field frame] Diagonal length 11.08

As described above, in the third embodiment,
By shifting the lens group g3 with respect to the optical axis 103, the subject image by the objective lens system is shifted, and the image blur of the subject image observed by the photographer is emphasized. At this time,
The shift amount (blurring amount) δ of the subject image on the field frame by the objective lens system when the lens group g3 is shifted by Δ with respect to the optical axis 103 is the use magnification of the lens group g3 β
3, and the use magnification of the lens group gc arranged on the image side of the lens group g3 is βc, it is expressed by the following equation (6). δ = (1-β3) · βcΔ (6)

In the third embodiment, substituting a specific numerical value for the use magnification of the above equation (6) gives the relation shown in the following equation (7). δ = 0.676 · Δ (7)

[0051]

[Effect] As described above, according to the present invention, since it is possible for a photographer to visually recognize the occurrence of camera shake due to camera shake or the like, shooting caused by camera shake The failure of can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a configuration of a camera according to a first embodiment of the present invention, which is a cross-sectional view cut so as to pass through an optical axis of a taking lens system and an optical axis of a finder system. .

2A and 2B are diagrams schematically showing a configuration of a finder system of FIG. 1, wherein FIG. 2A is a top view and FIG. 2B is a side view.

FIG. 3 is a conceptual diagram illustrating an image blur correction function of a camera according to a second embodiment of the present invention.

4A and 4B are diagrams schematically showing a configuration of a finder system of a second embodiment, in which FIG. 4A is a top view and FIG. 4B is a side view.

FIG. 5 is a diagram showing a structure in which a lens 108 according to a second embodiment is supported by an elastic body.

FIG. 6 is a perspective view schematically showing a configuration of a camera according to a third embodiment of the present invention.

7 is a cross-sectional view taken along the optical axis of the taking lens system and the optical axis of the finder system in FIG.

FIG. 8 is a diagram schematically showing a configuration of a drive mechanism of a lens L42 of the taking lens system of the third example.

FIG. 9 is a diagram schematically showing a configuration of a shift mechanism of a lens group g3 in the finder system of the third embodiment.

FIG. 10 is an enlarged detailed view showing the configuration of the shift mechanism of the lens group g3 in the finder system of the third embodiment.

[Explanation of symbols]

 1 camera body 2 shooting lens system 3 optical axis of shooting lens system 4 film surface 11 quick return mirror 12 auxiliary mirror 13 focal plane shutter 15 lens mount 21 focus detection system 102 viewfinder system 103 viewfinder optical axis 104 pentaprism 105 condenser lens 106 eyepiece lens system 111 support rod 112 fulcrum 113 weight 114 screen 116 coil 130 support rod 131 magnet 132 coil 204 objective lens system 205 eyepiece lens system 206 field frame

Claims (7)

[Claims] 1. A camera including a taking lens system for forming an image of a subject, and a finder system for observing the subject, wherein the camera body of the subject image observed through the finder system. In order to emphasize image blurring to the camera, a camera is provided with driving means for eccentricizing a part of the lens groups constituting the finder system according to the blur of the camera body. 2. The viewfinder system and the taking lens system have different optical axes spaced from each other, and the viewfinder system is an objective lens system for forming an image of the subject in order from the subject side. And an eyepiece lens system for magnifying and observing the image of the subject formed via the objective lens system, wherein the driving means has at least one lens in a lens group constituting the objective lens system. The camera according to claim 1, wherein the group is eccentric. 3. The photographic lens system is a variable power optical system having a variable focal length including at least two movable lens groups, and the finder system includes at least two movable lens groups, and the photographic lens system. 3. The field of view range is changed according to the photographing range, and the at least one lens group that is decentered by the driving unit is fixed in the optical axis direction during zooming of the finder system. The listed camera. 4. The finder system and the taking lens system have optical axes that overlap with each other, the finder system has an eyepiece lens system including at least two lens components, and the drive means 2. The camera according to claim 1, wherein a lens component closer to the subject than a lens component disposed closest to the photographer is decentered among a plurality of lens components forming the eyepiece lens system. 5. A camera comprising a taking lens system for forming an image of a subject and a finder system for observing the subject, wherein the taking lens system comprises a lens group of the taking lens system. It is an optical system that can shift the image by decentering some of the lens groups and correct the image blur caused by the blur of the camera body by the shift of the image. However, the viewfinder system is configured to enhance the image blur of the subject image observed through the viewfinder system with respect to the camera body only when the image blur is not corrected in the taking lens system. A camera comprising a driving means for eccentricizing a part of the lens groups in accordance with the blur of the camera body. 6. The viewfinder system and the taking lens system have different optical axes spaced from each other, and the viewfinder system is an objective lens system for forming an image of the subject in order from the subject side. And an eyepiece lens system for magnifying and observing the image of the subject formed via the objective lens system, wherein the driving means has at least one lens in a lens group constituting the objective lens system. The camera according to claim 5, wherein the group is eccentric. 7. The driving means includes at least one of the lens groups forming the objective lens system only when the camera body is shaken but the image shake is not corrected in the taking lens system. The camera according to claim 6, wherein the two lens groups are forcibly decentered.