JP3001010B2 - camera - Google Patents

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 having a photographing screen switching mechanism in a variable magnification camera.

[0002]

2. Description of the Related Art In recent years, the functions of cameras have been diversified, and one of them is switching of photographing screens. The switching of the shooting screen relates to, for example, switching to a half size or a panorama size with respect to the full size. In the camera, it is necessary to switch the field of view of the finder in conjunction with the switching of the shooting screen. Many proposals have been made for these switching mechanisms.

For example, the technology disclosed in Japanese Patent Application Laid-Open No. 1-207731 relates to the technology of a zoom drive system of a photographing lens and a zoom drive system of a finder linked therewith. According to this method, a photographic screen switching mechanism can be added to enable the finder field frame to be linked with the photographic screen switching. Also,
Japanese Patent Application Laid-Open No. 1-107240 relates to trimming, that is, a means for switching a finder field of view and a finder magnification when a photographing screen is switched. However, the means for switching the finder magnification is for switching the magnification of the finder eyepiece.

[0004]

However, in the apparatus disclosed in Japanese Patent Laid-Open No. 1-207731, the finder field frame is merely interlocked with the screen switching, and the finder screen becomes small, so that it is difficult to use. It is not good. FIG. 30A shows the finder field frame Fn during normal shooting, and FIG. 30B shows the finder field frame Fp1 switched. In this case, the field frame Fp1 has a screen in which the finder magnification is not changed, so that there is a problem that it is difficult to observe.

In the apparatus disclosed in JP-A-1-107240, the magnification of the finder eyepiece is increased at the same time as the finder field of view is switched when the photographing screen is switched. However, in order to increase the magnification of the viewfinder eyepiece, it is inevitable that the structure of the eyepiece becomes complicated and large. Usually, the eyepiece is arranged at the upper rear part of the camera body. However, the enlargement of this part poses a problem both in using the camera and in carrying the camera. Further, if the finder magnification is extremely increased, distortion and dust on the image forming surface of the finder will be observed in an enlarged manner, and it is necessary to further improve the accuracy of finder manufacturing, which is also a problem in terms of cost.

An object of the present invention is to simultaneously switch the magnification of the finder optical system when switching the finder visual field in conjunction with the screen switching.
To provide a camera that is simpler and smaller than the above-described conventional example, with the objective of facilitating the viewfinder observation by changing it like the wide field frame Fp2 shown in FIG. is there.

[0007]

A first camera according to the present invention includes a photographing optical system capable of changing the magnification and a photographing screen switching mechanism for switching the size of a photographing screen on which a subject image is formed by the photographing optical system. A finder optical system having an optical axis different from that of the photographing optical system and having a larger zoom ratio than the photographing optical system; and driving the finder optical system to change the magnification of the finder optical system. And a finder cam. The finder cam has a first area for changing the magnification of the finder optical system according to the magnification operation of the photographic optical system during normal shooting, and a first area that is interlocked with the first area and operates when the photographic screen switching mechanism operates. A second area for changing the magnification of the finder optical system is formed. A second camera according to the present invention is a camera for changing an observation magnification of a finder optical system according to a zooming operation of a photographic optical system capable of zooming, wherein a cam means for driving the finder optical system; And the above finder optics
One actuator that changes the magnification of the system
Observation of the above finder optical system for the zoom state of the optical system
Relative relationship changing means for changing the relative relationship of magnifications . A third camera according to the present invention is a camera for changing an observation magnification of a finder optical system according to a zooming operation of a photographic optical system capable of zooming, wherein a cam means for driving the finder optical system; And the above finder
And one actuator performing a zooming operation of the optical system, in a state in which the photographing optical system is set to a magnification value set in advance, the relative position to change the relative positions of the finder optical system relative to the cam means Changing means.
A fourth camera according to the present invention includes a variable magnification photographing optical system.
Change the observation magnification of the viewfinder optical system according to the zooming operation.
Camera that drives the finder optical system
Zooming between the photographing optical system and the finder optical system
One actuator that performs the operation and the above-mentioned imaging optical system
The position of the photographing optical system according to the magnification,
The position of the finder optical system according to the observation magnification of the optical system and
Relative position changing means for changing the relative position of
You . A fifth camera according to the present invention is a camera for changing an observation magnification of a finder optical system in accordance with a zooming operation of a variable-magnification photographing optical system, wherein a cam ring for driving the photographing optical system; A photographing screen switching means for switching the size of the photographing screen formed by the camera ring, and a rotatable position on the outer periphery of the cam ring, and driving the finder optical system by rotating integrally with the cam ring. A finder cam; and a relative position changing means for changing a relative position of the finder cam with respect to the cam ring in a state where the photographing optical system is set to a predetermined magnification value. A sixth camera according to the present invention is a camera for changing an observation magnification of a finder optical system in accordance with a variable magnification operation of a variable magnification photographing optical system, wherein a cam ring for driving the photographing optical system; Shooting screen switching means for switching the size of the shooting screen formed by the
A finder cam which is provided integrally with the cam ring on the outer periphery of the cam ring and drives the finder optical system by rotating together with the cam ring; A relative position changing means for changing a relative position of the finder optical system with respect to the finder cam in a state where the value is set to a value.

[0008]

In the first camera, the magnification of the finder optical system is changed by the finder cam in the first area during normal photographing, and the finder cam in the second area is changed by the finder cam in the second area when the photographing screen switching mechanism is activated. Change the magnification. In the second camera, the relative relationship changing means is provided.
Finder optics for the zoom state of the photographing optical system
The relative relationship of the observation magnification of the system can be changed . In the third camera, the magnification range of the observation magnification changed by the cam means can be changed. In the above-mentioned fourth camera, the relative position changing means allows the photographing optical system to operate.
Position of the photographing optical system according to the magnification, and finder optical
Phase with the position of the finder optical system according to the observation magnification of the system
The position can be changed . In the fifth camera, the magnification range of the observation magnification changed by the finder cam can be changed in accordance with the size of the shooting screen. In the sixth camera, the magnification range of the observation magnification changed by the finder cam can be changed in accordance with the size of the shooting screen.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. Prior to the description of the embodiments, the outline of the variable magnification photographing optical system, the finder optical system, the photographing screen switching mechanism, and the finder field frame switching mechanism of the camera of the present invention will be described.

FIG. 1 is an exploded perspective view of the camera.
This camera comprises a camera body 4, a lens barrel, a finder unit, a zoom motor unit 10, and a photographing screen switching mechanism. The switching of the shooting screen is performed in a normal size (hereinafter, referred to as N shooting) mode in a normal size (so-called full size 24 mm × 36 m).
m, hereinafter referred to as N size), a half size screen at the time of half size photographing, or a panoramic size (1 at the time of panoramic photographing (hereinafter referred to as P photographing) mode.
There is switching to a screen of 3 mm × 36 mm (hereinafter referred to as P size). In the case of the present camera, switching from a full size screen for N shooting to a panorama size screen for P shooting is performed.

The zoom motor unit 10 is supported by the main body 4, and includes a zoom motor 10a and a gear train 10b. The lens barrel comprises a fixed frame 5, a cam ring 6 rotatably supported by the fixed frame 5, and a photographic lens (not shown). A finder cam 7 having first and second regions is provided on the outer periphery of the cam ring 6 so as to be rotatable in the circumferential direction while being guided by the pins 6a and 6b. A gear 9 meshing with the gear train 10b is fixed to the cam ring 6. The finder cam 7
Are held switchably with respect to the cam ring 6 between two relative positions corresponding to the N imaging mode and the P imaging mode. Switching of the relative position is performed by shifting the holding position by applying the cam 7 to the stoppers 4i and 4k of the main body 4.

The finder unit includes a finder body 8.
And a guide shaft 29 supported by the main body 8 and an F frame 11, 1 for a finder lens slidably supported by the shaft 29.
2, finder zoom lenses 11b and 12b held by the frames 11 and 12, a switching lever 13 for operating a field mask, and an F frame spring 1 suspended from the frames 11 and 12 to each other.
4 and a porro prism, a field mask, an eyepiece, and the like (not shown). Then, the finder body 8 is attached to the camera body 4.

The photographing screen switching mechanism is disposed in front of the standard mask opening 4d of the camera body 4, and includes movable masks A1 and B2 for switching photographing screens and a P-ring for operating the mask. And 3. The guide pins 1b and 2b of the mask A1 and the mask B2 are guided by the two rectilinear guide grooves 4c (see FIG. 6) of the main body 4 so as to be movable to respective screen switching positions.

By operating the operating arm 3f, the P-ring 3 is driven via the driving pins 1a and 2a of the masks A1 and B2 fitted into the notches 3a and 3b provided on the inner periphery thereof. The mask A1 and the mask B2 are moved to respective screen size switching positions. Also,
The pin 3f of the P ring 3 is inserted into the stopper hole 4j of the main body 4, and regulates the position of the P ring 3. This restriction position gives a photographing screen size corresponding to N photographing and P photographing of the masks A1 and B2.

The operation of the above-configured camera will be described. First, in the zoom operation of the camera, the cam ring 6 is rotated by the zoom motor 10a based on the zoom control signal, and the zooming operation is performed. . Also,
Based on the zoom operation, F frame 1 of the finder unit
The cameras 1 and 12 are driven in the axial direction by a finder cam 7 to perform zooming of a finder image. In order to switch the photographing screen, in order to switch to the N photographing mode, the P-ring 3 is rotated counterclockwise (hereinafter referred to as CCW) to open the mask A1 and the mask B2 up and down to switch to the N-size screen. I do. To set the P photographing mode, the P ring 3 is rotated clockwise (hereinafter referred to as CW), and the mask A
1. Move the mask B2 so as to approach each other to obtain a P-size screen. The driving arm 3g presses the operation arm 13a of the switching lever 13 of the field mask of the finder unit to provide a finder field frame corresponding to the photographing screen size.

The relative positions of the cam ring 6 and the finder cam 7 are also switched in accordance with the switching of the photographing screen size. That is, the cam ring 6 is rotated to CCW or CW, the finder cam 7 is applied to the stoppers 4i, 4k, and the relative position with respect to the cam ring 6 is shifted to the position for the N photographing mode and the position for the P photographing mode. You. Accordingly, the cam pins 11a, 12a of the F frames 11, 12 of the finder unit are provided.
The area where a slides on the cam surfaces 7a and 7b of the finder cam 7 is different. Then, the first area is used for N shooting, and the second area is used for P shooting. However, the first and second areas are the cam surfaces 7.
a and 7b are formed continuously (FIG. 14).

As described above, in this camera, the finder field frame size is switched in accordance with the switching of the photographing screen size between N photographing and P photographing, and at the same time, the value of the magnification of the finder is changed. To prevent the viewfinder from being hard to see. For example, as shown in FIG. 30, the viewfinder field frame at the time of P photographing is Fp2 instead of the field frame Fp1 as in the conventional example.

FIGS. 2 and 3 show the zooming operation of the photographing lens and the finder zoom lens. As shown in FIG. 2, the extended positions of the first group lens 18a and the second group lens 19a, which are photographing lenses, in the wide state (A) and the tele state (B) are shown. And
The respective focal lengths f are 28 mm and 56 mm. The magnification is 2.

FIG. 3 shows the zooming state of the finder optical system, in which the variable magnification lenses 11b and 12b of the finder are shown.
Are shown in the wide state (A) and the telescopic state (B). Then, the range of the magnification is set to 0.35 to 0.91. Therefore, the total magnification is 2.6. However, the range of zooming corresponding to the finder cam first area for N shooting is 0.35 to 0.7, and the range of zooming corresponding to the second area for P shooting is 0.455 to 0. .91. Therefore, at the same time as the finder magnification increases, it becomes necessary to enlarge the field frame at the time of P photographing as shown by the field frame Fp2 in FIG.

Next, the main structure of the lens barrel will be described with reference to FIG. This lens barrel is a zoom lens barrel having a focal length of 28 to 56 mm, and has a two-group lens structure. As shown in FIG. 4, the second lens group slidably fits inside the fixed frame 5. Second group frame 1 holding 19a
9 and a moving frame 20 that supports the first group frame 18 of the first group lens 18a. And the frames 18, 19
Is moved in the direction of the optical axis O by driving the cam pins 21 and 22 fixed to the frame 19 and the moving frame 20 by the cams 6c and 6d of the rotating cam ring 6. The cam pins 21 and 22 are provided in the straight grooves 5 of the fixed frame 5.
It is assumed that the guide is guided in the optical axis O direction by c and 5b.

The shutter blades 20b are operated by a shutter focusing mechanism 20a provided inside the moving frame 20. At the same time, focusing drive of the first group lens 18 is performed via the drive pins 18b of the first group frame 18.

Next, the configuration of the optical system of the finder unit will be described with reference to FIG. As shown in FIG. 5, a Porro prism 15 having four reflecting surfaces is separated into two right and left bodies, and an image forming surface of a finder image forming system is positioned between them. The field mask 16 of the finder is composed of two sheets, and the long hole 16a is engaged with the projection 15a of the Porro prism 15, and is held slidably. The field switching lever 13 is rotatably held by the finder body 8 (FIG. 1), and is urged in the CCW direction by a field spring 17. When the P-ring 3 shown in FIG. 1 rotates in the CW direction by the P-photographing switching operation, the arm 3g of the P-ring 3 presses the arm 13a of the field switching lever 13 and the field spring 17 moves.
Rotate the field switching lever 13 in the CW direction.
At this time, since the U groove 13b of the field frame switching lever 13 is engaged with the projection 16b of the field mask 16, the field mask 16
Moves in the longitudinal direction of the long hole 16a, and the field frame size is switched.

The camera of the present invention has a schematic configuration as described above. Next, a camera according to a first embodiment of the present invention will be described in detail with reference to FIGS. The structure of the camera of this embodiment is the same as that of the camera shown in FIG. 1 except for the shape of the P-ring of the screen size switching mechanism. FIG. 6 is a front view of the state of the screen switching mechanism in the N shooting mode as viewed from the subject side. And FIG.
FIG. 7 is a sectional view taken along line AA of FIG. FIG. 8 shows that P
FIG. 9 is a sectional view taken along the line BB of FIG.

The above-described screen switching mechanism is provided between the surface 4f of the mask 4d of the camera body 4 and the end face 5a of the fixed frame 5. The switching mechanism includes a mask A1, a mask B2 for determining an actual photographing screen size at the time of P photographing, a P ring 33 for switching a mask position, and an opening 4d of the main body 4 for determining the N size of the actual screen at the time of N photographing. It is composed of The axial direction of the P-ring 33, the mask A1, and the mask B2 is regulated by the end surface 5a of the fixed frame 5 and the P-ring receiving surface 4e of the main body 4. Then, the P ring 33 is rotatably held by the outer peripheral receiving portion 4a.

Further, the masks A1 and B2 have pins 1b and 2b for guiding at the time of movement, and are fitted in the straight guide grooves 4c. The driving pins 1 a and 2 a provided on those masks are fitted in the cutout grooves 33 a and 33 b of the P-ring 33. Further, the P-ring 33 has contact surfaces 33e, 3
3d, the stopper 4b of the main body 4 abuts on the contact surface, and the N imaging position and the P imaging position are determined. And
The click projection 33c of the P ring 33 is fitted into the click groove 4g or 4h of the main body 4 and positioned with a click holding force.

Next, the operation of the screen switching mechanism will be described. In the N photographing mode state of FIG. 6, the mask A1 and the mask B2 are separated from each other and are located outside the range of the mask opening 4d of the main body 4, so that the opening 4
The N size (full size) of the actual screen is determined by d. In this state, the contact surface 33d of the P-ring is in contact with the stopper 4b, and the click protrusion 33c is fitted in the click groove 4g. When the operation arm 33f of the P ring is rotated in the CW direction from this position, the P ring 3
The masks A1 and B2 are formed by the three notches 33a and 33b.
Of the main body 4 by driving the pins 1a and 2a of the main body 4
Move downward or upward along the guide groove 4c. Further, when rotated, the contact surface 33e comes into contact with the stopper 4b, and the position is shifted to the P photographing mode position shown in FIG.
The ring 33 is located, and the click protrusion 33c is fitted into the click groove 4h. In this state, the masks A1, B2
Are close to each other, and the respective end faces 1d, 2
d forms an area of a real screen size of P size (panorama size).

To return to the N photographing mode state again,
By rotating the operation arm 33f of the P ring 33 in the CCW direction,
The state shown in FIG. 6 can be returned. Further, in the present embodiment, the shape of the opening 33h at the center of the P-ring has a necessary minimum dimension which is not smaller than the body opening 4d.
Unnecessary light is shielded as much as possible.

Next, a description will be given of a zoom mechanism of the finder optical system which is linked to the zooming and screen switching operations of the camera of this embodiment. 10 and 11 show a longitudinal sectional view of the finder cam 7 and the cam ring 6 in a wide state in the N photographing mode, and a development view thereof. Also, FIG.
Reference numeral 3 denotes a longitudinal sectional view in the telephoto state in the P photographing mode, and a developed view thereof. A rotatable finder cam 7 is provided on the outer periphery of the cam ring 6 via a relative position holding mechanism described later. The relative position holding mechanism holds the finder cam 7 with respect to the cam ring 6 at the wide end and the tele end, and rotates the finder cam 7 and the cam ring 6 integrally within the zooming rotation range θ of the cam ring 6. Let it. FIG.
0 and 12, the rotation angle θ of the cam ring 6 is
The angle is shown in the range from the wide position θA to the tele position θB indicated by a.

Then, as shown in FIGS.
In the photographing mode, the cam pins 11a of the F frame 11 and the cam pins 12a of the F frame 12
Due to the urging force of the finder cam 7 (see FIG. 1), the finder cam 7 is in contact with the cam surfaces 7a and 7b. The pin positions 11a and 12a (W / N) indicate the pin positions in the wide state at the time of N photographing. Then, the cam ring 6 is
Is rotated to the telephoto position, the cam pins 11a and 12a of the F frames 11 and 12 become the cam surfaces 7a and 7a of the finder cam 7.
b while sliding on the pin position 11a (T / N),
12a (T / N). The range from the (W / N) position to the (T / N) position of the pins 11a and 12a is a first region RN of the finder cam 7 used for N photographing.
The finder magnification is 0.35 to 0.7 times.

In order to switch from the N photographing mode in FIG. 10 to the P photographing mode in FIG. 12, the cam ring 6 in FIG. 10 is switched from the wide end to the P photographing mode until the turning position θC (pin 6a position). Rotate by angle θP. At this time,
The end face 7e of the finder cam is the stopper 4k of the camera body.
And the finder cam 7 is further pressed, so that the finder cam 7 is rotated about the angle 6P with respect to the pin 6a against the holding force of the position holding mechanism, and positioned at the relative position in the P photographing mode state. . This state is a wide state.

FIGS. 12 and 13 show the telephoto state of P photographing. When the cam ring 6 rotates to the wide side from this state, the cam pins of the F frames 11 and 12 become 11a and 12a (T / T).
It moves from the position P) to the positions 11a and 12a (W / P) while abutting on the cam surfaces 7a and 7b. This range is the second region Rp of the finder cam 7 used for P photographing.
The finder magnification is 0.455 to 0.91. As clearly shown in FIGS. 11 and 13, the second region Rp
And the first region RN correspond to the finder cam 7 with respect to the cam ring 6.
Are formed by changing the relative position of

In order to return to the N photographing state again, FIG.
As shown in FIG. 2, the cam ring 6 is rotated beyond the telephoto end by the N photographing switching angle θN, that is, to the rotation position θD.
With this operation, the end face 7d of the finder cam 7 comes into contact with the stopper 4i of the main body, and the finder cam 7 is further rotated in the CW direction relative to the cam ring 6 so as to be located at the relative position in the N photographing state. become. However, the position at that time is the tele position, and the state shown in FIG. 10 shows a state in which the cam ring 6 has been driven to the wide position.

As described above, in the finder of the camera of the present embodiment, the finder cam used in the conventional example is prepared in two areas, and the finder cam is selectively used in conjunction with the screen size switching operation.
This makes it possible to make the viewfinder easy to see.

Next, the aforementioned cam ring 6 and finder cam 7
However, the relative position holding mechanism will be described in detail. The holding mechanism of this embodiment uses a click stop mechanism. As shown in FIGS. 10 and 12, the finder cam 7 has click grooves 7e and 7f, and the cam ring 6 has A recess 6e for holding the click spring 30 is formed. Further, the click spring 30 has a projection 30a for dropping into the click grooves 7e and 7f.
Are formed. Although not shown, the finder cam 7 is restricted in the radial direction so as to be slidable on the outer periphery of the cam ring 6, and guide pins 6a and 6b are provided.
To be able to rotate in the circumferential direction.

In FIG. 10, since the projection 30a of the click spring 30 has fallen into the click groove 7e, the cam ring 6 and the finder cam 7 can rotate integrally in this state. When focusing on the guide pin 6a, it can be understood that the wide and telephoto states in the N shooting state can be set by moving the pin 6a within the range of the angle θ. When the cam ring 6 is rotated by an angle θP in the CW direction from the state shown in the figure, the end face 7e of the finder cam 7 comes into contact with the main body stopper 4k, and when it is further rotated, the projection 30a falls into the click groove 7f, and its fitting position is set. Is switched. By this switching operation, the relative positional relationship between the cam ring 6 and the finder cam 7 becomes a cam setting state for P photographing. Thereafter, when the position of the guide pin 6a of the cam ring 6 is returned from θC to θA, the wide state at the time of P photographing is obtained. Is set to

Similarly, when the cam ring 6 is turned in the CCW direction by an angle θN in the telephoto state of P photographing in FIG. 12, the end face 7d of the cam 7 comes into contact with the main body stopper 4i, and the cam ring 6 is further turned. As a result, the finder cam 7 rotates relatively to the cam ring 6, the projection 30a of the spring 30 switches from the click groove 7f to 7e and falls, and the relative positional relationship between the cam ring 6 and the finder cam 7 is The cam setting state for the N shooting mode is set. When the guide pin 6a of the cam ring 6 is returned to the position .theta.B, the telephoto setting state for N photographing is set.

FIG. 14 shows the operating states of the cam ring 6 and the finder cam 7 in FIGS. 10 and 12 collectively. In each setting state, the cam pins 11a and 12a correspond to the cam surfaces 7a and 7b. This indicates whether the area is slid on. Although the relative position holding mechanism in this embodiment employs a click stop mechanism, it is also possible to use a mechanism that separately uses a holding force due to friction, or a mechanism that uses the holding force of a click action and a friction action. is there.

FIG. 15 is an exploded view showing an operation state of the cam ring 6 and the finder cam 7 in FIG.
Between the states Q1 and Q2, the cam ring 6 corresponding to the N photographing mode
And the position of the finder cam 7. The cam ring 6
Zooming is performed at an angle θ between the positions θA and θB. Also, between the states Q2 and Q3, an operation section for switching to the P photographing state is shown, the finder cam 7 is brought into contact with the stopper 4k, and the relative position between the cam ring 6 and the finder cam 7 is switched as described above. For rotation (θP)
I do. Thereafter, when the cam ring 6 is turned reversely by the angle θP, the state becomes the state Q4. This state is a wide state in the P shooting mode.

The states Q4 to Q5 show the positional relationship between the cam ring 6 and the finder cam 7 in the P photographing mode. The cam ring 6 and the finder cam 7 rotate integrally for an angle θ.
Similarly, an arbitrary focal length can be set between θ. Next, the operation from the state Q5 to the state Q6 indicates a switching operation to the N photographing mode, and the finder cam 7 is moved to the main body stopper 4i.
To the cam ring 6 and the finder cam 7 as described above.
(ΘN) to change the relative position with respect to.

Thereafter, when the cam ring 6 is turned reversely by the angle θN, the state Q1 is returned. It should be noted that P
The switching between the photographing state and the N photographing state can be performed by rotating the cam ring 6 as described above even from an arbitrary focal length state.

Next, a camera according to a second embodiment of the present invention will be described. This embodiment differs from the first embodiment in the magnification switching mechanism of the finder. FIG.
6 and FIG. 17 are a developed view and a front view of the cam ring 46 and the finder cam 46a during N photographing. FIG. 18 shows a longitudinal sectional view thereof. As shown in FIGS.
Is rotatably supported on the outer periphery of the fixed frame 5 that holds the taking lens system. A finder cam 46a, which is a zooming cam of the finder optical system, is formed integrally with the cam ring 46. A guide rail 26 is slidably provided on the fixed frame 5. When the cam ring 46 rotates, the sliders 25 (two locations) are driven in the optical axis direction along the guide rail 26 by the finder cam 46 a. Slider 2
5 is provided with a drive cam portion for biasing the pins 11a and 12a of the F frames 11 and 12, and drives the F frames 11 and 12 in conjunction with the driving of the slider 25. Further, as described later, the guide rail 26 is connected to an arm (not shown) of the P ring 3 of the real screen switching member in FIG. 1 and rotates integrally. As described later, to switch from the N shooting mode to the P shooting mode, the guide rail 26 and the P ring 3 are integrally rotated, and the rotation angle at that time is the switching angle θK (see FIG. 19).

The finder cam 46a has a zoom range wider than the zoom range of the corresponding photographing lens, as shown in FIG. That is, the wide end is a wide position at the time of N shooting, and the tele end is a tele end at the time of P shooting. The P and N photographing modes are switched by providing a rotation difference of the switching angle θK to the guide rail 26 to switch between the zoom range for N photographing and the zoom range for P photographing.
The amount of displacement of the finder cam 46a is determined by the F frame 1 of the finder.
The slider 25 for transmitting to the first and the second 12 is divided into two blocks, and is fitted to a rotatable guide rail 26 fitted to the outer periphery of the cam ring 46 so as to be able to advance and retreat in the optical axis direction. The slider 25 is mounted in two blocks as described above, corresponding to the cam surfaces 46b and 46c of the finder cam 46a. The cam pin 25 of the slider 25
a and 25b abut against the cam surfaces 46b and 46c, respectively.

The F frames 11 and 12 which are the lens frames of the variable magnification lens of the finder are provided on the rail surface 8a of the finder body 8.
And a guide shaft 29 fixed to the finder main body, so as to be movable in the optical axis direction of the lens. F frame 1
Pins 11a and 12a, which are integral with the lens 1 and 12, respectively, are provided on a contact surface 25 of a slider 25 which is substantially orthogonal to the optical axis O of the taking lens.
c, 25d. An F-spring 14 is hung between spring hooks 11c, 12c integral with the F-frames 11, 12, and the pins 11a, 12
a, and cam pins 25a, 25a, integral with the two sliders 25 via the contact surfaces 25c, 25d of the slider 25.
25b are in contact with the cam surfaces 46b and 46c, respectively. Further, as described above, the guide rail 26 is connected to the arm (not shown) of the P ring 3 of the real screen switching member in FIG. 1 and rotates integrally.

The magnification changing operation of the finder of the camera according to the present embodiment configured as described above will be described. The other configuration of the present embodiment will be described by applying the configuration shown in FIG.
First, in order to switch from the N shooting mode to the P shooting mode, a P ring 3 (not shown) in the CW direction in FIG.
Is rotated, the guide rail 26 also rotates in the CW direction together with the P-ring 3. When the P ring 3 is rotated to the stopper position, the guide rail 26 rotates until the pins 25a and 25b of the slider 25 are positioned from the N imaging position A to the P imaging position B in FIG. At this time, the slider 25
Since the cam pins 25a and 25b rotate while contacting the cam surfaces 46b and 46c by the urging force of the F spring 14,
While sliding along the guide rail 26, the lens is displaced in the optical axis direction of the photographing lens, and C, C on the finder cam 46a surface in FIG.
Move in the direction of D.

The pins 11a and 12a of the F frame are
Since they are in contact with 5b and 25c, they move together with the slider 25. That is, the pin position 11a during N shooting
(A) and 12a (A) are pin positions 11a at the time of P photographing.
Move to (B), 12a (B). Then, the lens of the finder optical system moves in the optical axis direction along the finder cam 46a. In this way, the position of the lens of the finder optical system moves by an amount corresponding to the rotation of the switching angle θK relative to the finder cam 46a.
The camera switches to the P shooting mode position. When the cam ring 6 is rotated in the state set as described above, zooming in the P photographing mode is performed.

On the other hand, in order to switch to the N photographing mode, the guide rail 26 can be switched to the N photographing position A by rotating the guide rail 26 from the P photographing position B in the opposite direction by the switching angle θK. FIG. 20 shows the above-mentioned foundation cam 46a.
7 is a developed view showing the operation position of the cam 46a. In the cam 46a, the zoom range in the N shooting state is the first area RN, and the zoom range in the P shooting state is the second area RP.

In this embodiment, the switching between the N shooting and the P shooting can be performed in an arbitrary zoom setting state. That is, in order to switch from an arbitrary focal length setting position for N photographing to the focal length setting position for P photographing, the guide rail 26 may be rotated by the angle θK, and vice versa. is there.

FIG. 2 shows a camera according to a third embodiment of the present invention.
This will be described with reference to FIGS. FIG. 21 is an exploded perspective view of the main structure of the camera of this embodiment. This camera is
The finder cam differs from the camera shown in FIG. 1 in the magnification switching structure.
It has the same configuration as that of the mechanism section.

The main structure of the mechanism for switching the finder magnification of the camera of the present embodiment is as follows.
And the finder cam 24 are integrally provided.
PN rotatably fitted to the outer periphery of finder cam 24
A switching ring 23 is provided. And the PN
By operating the switching ring 23, the action surface of the cam surface 24d, 24f or 24c, 24e of the finder cam 24 can be selected to change the magnification of the finder optical system in accordance with the N shooting mode and the P shooting mode. Things.

The finder variable magnification switching mechanism will be described in more detail. First, referring to FIGS.
In the N shooting mode, the PN switching ring 23
And the finder second and third lenses 51b and 52b held by the F frames 51 and 52
a, 51b via the cam surfaces 24d, 24 for N photographing mode
Driven by f.

That is, the cam pins 51a of the F frames 51 and 52,
52a is a cam 24d in the first area of the finder cam 24,
Abuts on the 24f surface and moves to position 51a with zooming.
Between (B) and 51a (C) and at positions 52a (B) and 52
Slide between a (C).

To switch to the P photographing mode, first, the photographing lens is put in the housed state, and the cam pins 51a and 52a are
It is moved to display positions 51a (A) and 52a (A). Then, the P-ring 3 (see FIG. 21) of the real screen switching mechanism is connected to the PN switching ring 23 via a mechanism (not shown).
Is rotated to the position 23 (B). With this rotation, F
The cam pins 51a, 52a of the frame are located at positions 51a (D), 52a.
a (D).

When the photographing lens is extended and zooming is performed in this state, the cam pins 51a and 52a
4c and 24e are brought into contact with each other, and the positions 51a (E) and 51a
The zooming of the finder lens is performed by sliding between (F) and between the positions 52a (E) and 52a (F).

Further, to return to the N photographing mode, the cam pins 51a and 52a are moved to the positions 51 with the photographing lens being in the storage position.
a (D) and 52a (D), and further, the PN switching ring 23 is returned to the position 23 (A), and the cam pin is moved to the position 51a.
By returning to (A) and 52a (A), it is possible to return to the N shooting mode. Note that, in FIG.
The cam pins 51a and 52a of the finder cam 2
4, it is assumed that a spring 54 for abutting the ring 23 is suspended on the spring support portions 51c and 52c of the F frame.

The PN switching ring 23 must be locked so as not to be inadvertently moved at the time of switching, that is, except when the photographic lens is stored. The locking mechanism will be described. As shown in FIG. 24, the PN switching ring 23 is positioned at the outer periphery of the finder cam 24 with respect to the camera body.
It is rotatably mounted. Holes 23a and 23b for P and N photographing modes are provided on the circumference of the ring. A locking claw 58b of a lever 58 pivotally attached to a shaft 57 on the camera body is urged by the spring 27 to engage with the holes 23a and 23b. Further, the cam ring 56
A PN switching pin 28 is provided above. And PN
The switching lever 58 has a contact surface 58a with which the pin 28 contacts when the photographing lens is stored. When the photographing lens reaches the storage position, the claw 58b of the lever 58 is moved to the pin 2 position.
8 to be pushed out of the hole 23a or 23b on the PN switching ring 23.

When the taking lens is extended, the pin 28 does not reach the contact surface 58a of the lever 58, and the claw 58b remains engaged with either the hole 23a or 23b. In this state, the PN switching ring 23
Holds the locked state. When the photographing lens reaches the retracted position, the pin 28 kicks the lever 58 and rotates in the CW direction, so that the pawl 58b is disengaged from the holes 23b and 23a, and the ring 23 is rotatable, and the PN photographing mode can be switched. is there.

Next, a camera according to a fourth embodiment of the present invention will be described with reference to FIGS. The main configuration of the camera of this embodiment is the same as that of the camera shown in FIG. 1, except for the switching structure of the finder zooming mechanism. As shown in FIG. 25, the finder zoom mechanism of the camera of the present embodiment has a finder cam 67 in which cam pins 61a and 62b of F frames 61 and 62 holding a finder lens are integrally provided on a cam ring 66. Abuts on the cam surface of the camera and interlocks with the zooming of the taking lens.
1, 62 are driven. Further, when switching between the N photographing mode and the P photographing mode, the cam surface with which the cam pins 61a and 62b abut is switched.

As shown in FIG. 26, cam pins 61a and 62a and spring hooks 61c and 62 are mounted on the F frames 61 and 62, respectively.
c is integrally formed. The F frames 61 and 62 are slidably held in the optical axis direction by the sliding guide shaft 29 and the support portion 70, and enable the finder lens to move straight in the optical axis direction. Further, the slide plate 65 is supported by the holding portion 71 so as to be able to move straight in the direction of the optical axis O of the general photographing lens. The slide plate 65 is interlocked with an N shooting mode switching mechanism (not shown) and a P shooting mode switching mechanism (not shown), and the N shooting position 65 (A) shown in FIG. 27 and the P shooting mode shown in FIG.
It is possible to move between the shooting position 65 (B).

The slide plate 65 has spring hooks 65b, 65
26 and 27, the spring hooks 61c and 62c of the F frame and the slide plate 6 are formed integrally with each other as shown in FIGS.
5 between the spring hooks 65b and 65c.
Multiplied by 3,64. When the slide plate 65 is at the N shooting position 65 (A), the spring hook is 65b (A),
At the position of 65c (A), the F frames 61, 62 are urged in the direction of E in FIG.
Reference numeral 62a contacts the finder cams 67a and 67c in the first area, which is the cam surface for the N photographing mode.

When a mode switching mechanism (not shown) is switched to the P photographing mode, the slide plate 65
The camera moves to the 29 P shooting mode position 65 (B). And the slide plate spring hook is 65b (B), 65c (B)
And the F frames 61, 6 by the force of the springs 63, 64
2 is urged in the direction F in FIG. 29, and the cam pins 61a, 62
a contacts the finder cam surfaces 67b and 67d in the second area for the P photographing mode. In this way, the finder cam is switched from the N imaging mode cam surface to the P imaging mode cam surface.

As described above, in the finder zooming mechanism of the camera according to the present embodiment, the F frames 61 and 62 slide in contact with the cam surfaces on the respective photographing mode sides, and interlock with each mode switching. To enable the operation of switching the magnification of the finder. The camera of this embodiment can be applied to a tele-wide two-focus switching camera and an electronic camera equipped with an optical finder, in addition to the cameras of the embodiments described above.

[0062]

As described above, the camera of the present invention uses the cam to change the magnification range of the finder optical system in conjunction with the switching of the photographing screen, and uses the finder cam that gives the magnification at the time of normal photographing. And a region to be used at the time of screen switching. According to the camera of the present invention, the screen can be formed by a simple configuration linked to the screen switching without changing the basic configuration of the conventional example. A remarkable effect is obtained such that a very easy-to-see finder image is obtained even when the mode is switched.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an outline of the structure of a camera according to the present invention.

FIG. 2 is a view showing a zoom state of a photographing optical system of the camera of FIG. 1;

FIG. 3 is a view showing a zoom state of a finder optical system of the camera of FIG. 1;

FIG. 4 is a longitudinal sectional view of a main part of a taking lens barrel of the camera of FIG. 1;

FIG. 5 is an exploded perspective view of a main part of a finder optical system of the camera shown in FIG. 1;

FIG. 6 is a front view of a screen switching mechanism in an N shooting mode of the camera according to the first embodiment of the present invention.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is a front view of a screen switching mechanism in the P shooting mode of the camera of FIG. 6;

FIG. 9 is a sectional view taken along the line BB of FIG. 8;

FIG. 10 is a longitudinal sectional view showing a relative positional relationship between a cam ring and a finder cam in the N photographing mode of the camera of FIG. 6;

FIG. 11 is a development view of the finder cam of FIG. 10;

12 is a longitudinal sectional view showing a relative positional relationship between a cam ring and a finder cam in a P photographing mode of the camera of FIG. 6;

FIG. 13 is a development view of the finder cam of FIG. 12;

14 is a development view showing a relative positional relationship between a finder cam and a cam pin in the N and P photographing modes of the camera shown in FIG. 6;

FIG. 15 is a view showing a cam ring and a finder cam in an unfolding operation state showing a switching state of the N and P photographing modes of the camera of FIG. 6;

FIG. 16 is a development view of a finder cam section in an N photographing mode of a finder optical system variable magnification mechanism of a camera according to a second embodiment of the present invention.

FIG. 17 is a longitudinal sectional view of a finder cam portion of the finder optical system zoom mechanism shown in FIG. 16;

18 is a longitudinal sectional view of a finder cam portion of the finder optical system zoom mechanism shown in FIG.

FIG. 19 is a view showing a P of the finder optical system zoom mechanism shown in FIG. 16;
FIG. 4 is a development view of a finder cam section in a shooting mode.

FIG. 20 is a view showing the N of the finder optical system zooming mechanism shown in FIG. 16;
FIG. 6 is a development view of the viewfinder cam in a P shooting mode switching state.

FIG. 21 is an exploded perspective view of a camera showing a third embodiment of the present invention.

FIG. 22 is a longitudinal sectional view of a finder zooming mechanism of the camera shown in FIG. 21;

FIG. 23 is a developed view of a finder cam of the camera of FIG. 21.

FIG. 24 is a longitudinal sectional view of a PN switching ring lock mechanism of the finder variable magnification mechanism of the camera of FIG. 21;

FIG. 25 is a longitudinal sectional view of a finder optical system zoom mechanism of a camera showing a fourth embodiment of the present invention.

FIG. 26 is a diagram showing the N of the finder optical system zoom mechanism shown in FIG. 25;
FIG. 4 is a vertical sectional view in a photographing mode.

FIG. 27 is a diagram showing the N of the finder optical system zoom mechanism shown in FIG. 25;
It is a development view in a photography mode.

FIG. 28 is a view showing the P of the finder optical system zoom mechanism shown in FIG. 25;
It is sectional drawing in a photography mode.

FIG. 29 is a view showing the P of the finder optical system zoom mechanism shown in FIG. 25;
It is a development view in a photography mode.

30A and 30B show respective visual field frames with respect to the photographing screen of the camera. FIG. 30A shows a visual field frame during normal photographing, and FIG.
0 (B) is a field frame at the time of panoramic shooting of a conventional camera,
FIG. 30C is a diagram showing a field frame at the time of panoramic shooting of the camera of the present invention.

[Explanation of symbols]

 1. Mask A (Shooting screen switching mechanism) 2. Mask B (Shooting screen switching mechanism) 3, 33 P-ring (Shooting screen) (Switching mechanism) 18a First group lens (photographing optical system) 19a Second group lens (photographing optical system) 7, 24, 46a, 67 … Finder camera

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-113341 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 13/00-13/36

Claims (7)

(57) [Claims] A photographing optical system capable of zooming, a photographing screen switching mechanism for switching the size of a photographing screen on which a subject image is formed by the photographing optical system, and an optical axis different from the photographing optical system. A finder optical system having a zoom ratio greater than that of the photographing optical system, and a finder cam that changes the magnification of the finder optical system by driving the finder optical system. In normal photographing, a first area in which the magnification of the finder optical system is changed in accordance with the zooming operation of the photographing optical system, and a first area continuous with the first area,
A second area for changing a magnification of the finder optical system when the photographing screen switching mechanism is operated. 2. The method according to claim 1, wherein the first area and the second area of the finder cam are switched by moving the finder cam from a position used during normal photographing in conjunction with the operation of the photographing screen switching mechanism. Claim 1 characterized by the following:
The camera according to. 3. A camera for changing an observation magnification of a finder optical system in accordance with a magnification change operation of a photographing optical system capable of changing magnification, a cam means for driving the finder optical system, the photographing optical system and the finder optical system. System zoom operation
One actuator to perform and the finder optics for the zoom state of the photographic optical system
Relative relationship changing means for changing the relative relationship of the observation magnification of the system
Camera, characterized in that the, the equipped. 4. A camera for changing an observation magnification of a finder optical system in accordance with a zooming operation of a photographing optical system capable of changing magnification, a cam means for driving the finder optical system, the photographing optical system and the finder optical system. System zoom operation
And one actuator performing, in a state in which the photographing optical system is set to a magnification value set in advance, anda relative position changing means to change the relative positions of the finder optical system relative to the cam means A camera, wherein a variable magnification range of the observation magnification changed by the cam means can be changed. 5. According to a variable power operation of a variable magnification photographing optical system.
Camera to change the observation magnification of the viewfinder optical system
Te, carried a cam means for driving the finder optical system, the zooming operation of the photographing optical system and the viewfinder optical system
One actuator and the position of the photographing optical system according to the magnification of the photographing optical system
And a file corresponding to the observation magnification of the finder optical system.
Relative position change to change the position relative to the position of the
Features and to Luke camera that includes a unit. 6. A camera for changing an observation magnification of a finder optical system according to a zooming operation of a photographing optical system capable of changing magnification, wherein an image is formed by a cam ring driving the photographing optical system and the photographing optical system. A finder screen switching means for switching the size of the photographic screen, and a finder cam rotatably positioned on the outer periphery of the cam ring and driving the finder optical system by rotating integrally with the cam ring. A relative position change unit that changes a relative position of the finder cam with respect to the cam ring in a state where the photographing optical system is set to a predetermined magnification value. A camera characterized in that the magnification range of the observation magnification changed by the finder cam can be changed correspondingly. 7. A camera for changing an observation magnification of a finder optical system in accordance with a zooming operation of a photographing optical system capable of changing the magnification, wherein an image is formed by a cam ring for driving the photographing optical system and the photographing optical system. Photographing screen switching means for switching the size of a photographing screen to be photographed; and the finder provided integrally with the cam ring on the outer periphery of the cam ring and driving the finder optical system by rotating with the cam ring. A cam, and relative position changing means for changing a relative position of the finder optical system with respect to the finder cam in a state where the photographing optical system is set to a predetermined magnification value. A camera characterized in that the magnification range of the observation magnification changed by the finder cam can be changed according to the size.