JP3250754B2 - Screen size switching 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 screen size switching camera, and more particularly to a screen size switching camera capable of switching the screen size on the same roll film.

[0002]

2. Description of the Related Art Heretofore, a large number of cameras for taking a picture by switching the screen size, especially cameras capable of taking a picture by switching to a panorama size have been released and proposed. For example, Japanese Utility Model Laid-Open No. 3-105834 and Japanese Utility Model Laid-Open No. 3-122435.
In Japanese Patent Laid-Open Publication No. H10-163, a camera having a mechanism for switching to a panoramic size in a camera body is proposed.

[0003]

In the above-described conventional example, two screen size regulating members (mask members) are always provided regardless of a normal size or a panoramic size. Then, for example, in a panoramic state, the mask member is disposed in an aperture portion in the camera body. When the back cover of the camera body is opened while the mask member is in the panoramic state, the mask member is disposed in the aperture portion, so that the user or the film leader may inadvertently touch the mask member and be damaged. There was a risk of causing it.

The present invention has been made in view of such a problem, and provides a screen size switching camera which does not have a risk of breaking the mask means even when the back cover is opened when the screen size is switched. The purpose is to:

[0005]

To achieve the above object, a first screen size switching camera according to the present invention is disposed between a photographing lens and a photographing screen, and projects into an area of the photographing screen. A mask member movable between a protruding position and a retracted position retracted from the photographing screen area; operating means for designating the position of the mask member at the time of exposure; and a display for performing display in accordance with instructions from the operating means Means, a back cover rotatable between a closed position for shielding at least a part of the photographing screen and an open position for exposing the same, and an interlocking mechanism capable of displacing the position of the mask member by a rotating operation of the back cover. Means, wherein the mask member is retracted by the interlocking means when the back lid is rotated from the closed position to the open position in a state where the mask member is at the projecting position. Displaced into position, If the Kiurafuta is rotated again to the closed position the mask member by the interlocking means, characterized in that displaced to the protruding position. In order to achieve the above object, a second screen size switching camera according to the present invention comprises:
In the first screen size switching camera, the display means displays the position of the mask member by switching a finder field of view, and displays the position of the mask member according to opening and closing of the back cover.
Regardless of the displacement of the position of the mask member, the display is performed according to the designation of the operation means.

In order to achieve the above object, a third screen size switching camera according to the present invention is disposed between a photographing lens and a photographing screen, and a projecting position protruding into an area of the photographing screen; A mask member movable between a retracted position retracted from the screen area, and a
Operating means for designating a position, a mask urging member for urging the mask member toward one of the protruding position and the retracted position, and an urging direction for selecting an urging direction of the mask urging member comprising selecting means, the dew by the operation means
Make sure that the position of the mask member when light is
When the exposure is performed, the urging direction selecting means is operated at the time of photographing exposure , the mask member is moved to the projecting position by the urging force of the urging means , and the urging direction selecting means is operated at the end of exposure. The mask member is moved to the retracted position by the urging force of the urging means .

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a main part of a screen size switching camera according to a first embodiment of the present invention.

The screen size switching camera according to the first embodiment is a camera having a normal photographing function. A photographing lens barrel 11 is disposed on the front of the camera body 1.
A patrone chamber 13 is provided on one side and an spool chamber 14 is provided on the other side with an aperture 12 formed behind the taking lens barrel 11 therebetween. Further, a mask 2a, a mask 2a,
2b is slidably provided in the vertical direction. The masks 2a and 2b slide in the up and down direction, for example, and play a role of regulating a shooting screen when shooting in a panoramic size. In the drawings, reference numerals 10a and 10b denote film rails disposed behind the masks 2a and 2b.

In this embodiment, the masks 2a and 2b are respectively slid up and down to a position shown by a two-dot chain line in FIG. I do. This makes it possible to shoot in panoramic size.

FIG. 2 is a flowchart showing the operation of the screen size switching camera of the first embodiment.

First, a switching operation to panorama-size shooting is performed (step S1), and when a release operation is performed (step S2), the masks 2a and 2b slide inward of the aperture section 12 (step S1). Step S3). After this,
Focusing and exposure operations are performed (step S
4, S5), and the focusing is reset (step S6). Thereafter, the masks 2a and 2b are
(Step S7), and the film winding operation is performed (step S8).

That is, the masks 2a and 2b do not interlock with the screen size switching operation and always stand by at the normal size position.
Only before and after the exposure operation, it slides into the aperture section 12. That is, the finder field frame, the date imprinting optical system, and the like are linked to the screen size switching operation, and the movement of the masks 2a and 2b may be driven in synchronization with the driving source for focusing.

Next, the masks 2a, 2a,
2b and its periphery will be described in more detail.

FIG. 3 is an enlarged perspective view of the essential parts showing the masks 2a and 2b and their peripheral parts in the screen size switching camera of the first embodiment.

As shown in the figure, each of the masks 2a, 2b
On one side, cam followers 2c and 2d are respectively provided integrally with the masks 2a and 2b toward the front. Both the lower portion of the cam follower portion 2c and the upper portion of the cam follower portion 2d have a substantially cylindrical shape, and cam followers are formed at positions facing each other. The cam followers 2c and 2d are both slidably supported in the vertical direction by the same support shaft 9.

A three-dimensional cam 3 is disposed integrally with the support shaft 9 between the two cam followers 2c and 2d, and the three-dimensional cam 3 and the cam followers 2c and 2d form a cam mechanism. ing. A driven gear 6 which rotates in synchronization with a focusing driving source (not shown) is provided integrally with the support shaft 9 below the support shaft 9. The three-dimensional cam 3 rotates in conjunction with the rotation of the driven gear 6.

On the other hand, further forward of the cam followers 2c and 2d, switching members 5a and 5b which move in the vertical direction in conjunction with a screen size switching operating member (not shown) are provided, respectively. Further, toggle springs 4a, 4b are respectively provided between the switching members 5a, 5b and the cam followers 2c, 2d, and the switching members 5a, 5b are respectively provided.
The urging direction of the masks 2a and 2b can be switched in accordance with the vertical movement of.

FIG. 4 shows the masks 2a and 2b, the three-dimensional cam 3, and the switching members 5a and 5b and their peripheral portions in the screen size switching camera according to the first embodiment.
It is the side view seen from the arrow A direction.

At the time of photographing in a panoramic size, the switching members 5a and 5b are at the position (P) shown by a two-dot chain line in the figure.
The masks 2a and 2b are urged inwardly of the aperture section 12 (see FIG. 1) by the toggle springs 4a and 4b (indicated by a two-dot chain line in the figure). At this time, the driven gear 6
Is rotated in synchronization with focusing, the three-dimensional cam 3 also rotates in conjunction with the driven gear 6. Then, the masks 2a and 2b slide along the three-dimensional cam 3 by the above-described cam mechanism, and mask the upper and lower portions of the aperture section 12.

At the time of photographing in the normal size, the switching members 5a and 5b are at the position (N) shown by solid lines in the figure, and the masks 2a and 2b are urged outward from the aperture section 12 by the toggle springs 4a and 4b. (Shown by a solid line in the figure). At this time, even if the driven gear 6 rotates in synchronization with focusing and the three-dimensional cam 3 rotates in conjunction with the driven gear 6, the masks 2a and 2b do not move.

According to the first embodiment, the masks 2a and 2b
Operates only before and after the exposure operation, and at other times, it is always held at the position of the normal size shooting state. Therefore, even if the user inadvertently opens the back cover, the mask 2a,
Since the mask 2b does not exist in the aperture section 12, it is possible to prevent an accident in which the mask 2a, 2b is touched and damaged.

FIG. 5 is an enlarged side view of a main part of a screen size switching camera according to a second embodiment of the present invention.

The basic structure of the second embodiment is the same as that of the first embodiment.
Same as the embodiment, except that the toggle springs 4a, 4b in the first embodiment are replaced with tension springs 4a ', 4b'.
The positional relationship between the switching members 5a and 5b, that is, the positional relationship between the normal size shooting and the panorama size shooting is reversed. The other configurations and operations are the same as those of the first embodiment, and the description is omitted here.

FIG. 6 is an enlarged side view of a main part of a screen size switching camera according to a third embodiment of the present invention.

The basic structure of the third embodiment is the same as that of the first embodiment.
This is the same as the embodiment, except that the driven gear 6 in the first embodiment is disposed integrally with the three-dimensional cam 3 on the inner peripheral portion of the three-dimensional cam 3 (reference numerals 3 ', 6' in the figure). ).

Next, a screen size switching camera according to a fourth embodiment will be described with reference to FIGS.

FIG. 7 is a central longitudinal sectional view of a camera for switching a screen size according to a fourth embodiment of the present invention.

At the rear of the camera body 23, there is provided an aperture 31 for defining an area of a shooting screen of, for example, 36 mm wide × 24 mm long (Leica size) as normal shooting.
Is formed, and immediately behind the aperture 31,
A roll film 32 is stretched so as to be perpendicular to the optical axis 0 of the taking lens 27, and immediately behind the back film 2,
The pressure plate 30 disposed at 9 presses the film 32 forward. The pressure plate 30
A pressing spring 4 (not shown) disposed on the back side thereof
1 (see FIG. 8), the upper and lower edges of the platen rails are respectively abutted on the upper and lower rear surfaces of the aperture 31 so as to project horizontally rearward.
The film 32 is stretched in a gap formed between the aperture 31 and the pressure plate 30 so that the film 32 can be fed.

Immediately before the aperture 31, an upper switching mask 36 a which is a mask means for covering the upper edge and the lower edge of the aperture 31 and switching the photographing screen size to limit the photographing range of the aperture 31. , And the lower switching mask 36b are disposed so as to be movable in opposite vertical directions. The masks 36a and 36b are operated from outside the camera by operating members (not shown). The upper switching mask 36a and the lower switching mask 36b are retracted upward and downward with respect to the aperture 31, respectively (two points). When it is arranged (shown by a dashed line), the entire aperture 31 regulates the shooting range, and the shooting range at this time is normal shooting. On the other hand, when the upper switching mask 36a and the lower switching mask 36b are disposed (shown by solid lines) so as to penetrate the lower and upper portions of the aperture 31 respectively (shown by solid lines), the photographing screen is smaller than the normal photographing. , 36mm ×
A 12 mm panorama shooting screen is displayed, and panorama shooting is performed.

At the front center of the camera body 23 in front of the aperture 31, a lens frame 26 holding a taking lens 27 is provided. Behind the photographing lens 27, a shutter blade 25 for exposing a subject image on the film 32 is supported by the lens frame 26 so as to be freely opened and closed. A feed screw shaft 33 in which a male screw is screwed is screwed into a screw hole in which a female screw formed in the optical axis direction is screwed at the lower end of the lens frame 26. The feed screw shaft 33 has one end at a lower portion of a front plate 24 forming an entrance opening of the photographing lens disposed at the front of the camera body 23, and the other end of the feed screw shaft 33 of the camera body 23. The lens frame 26 holding the photographing lens 27 is reciprocated in the direction of the optical axis 0 by being rotatably supported in parallel with the optical axis 0 by support portions 23f projecting upward at the lower rear portion. It is made to let.

A finder frame 50 (see FIG. 9) for supporting a finder optical system and a distance measuring device (not shown) is provided above the camera body 23. A gear arrangement hole is formed in the lower outer surface of the camera body 23. A film rewind gear 34 is rotatably mounted on a support shaft projecting downward at the center of the gear arrangement hole. Supported. The lower edge of the rewinding gear 34 is provided so as to cover the entire gear arrangement hole.
5 is provided integrally with the camera body 23.

The camera body 23 is provided with the aperture 3
The front portion from 1 is light-tightly covered with a front cover 21, and the front central portion of the front cover 21 is
An entrance hole for transmitting subject light incident on the reference numeral 7 is formed. Further, a rear cover 28 is disposed at a rear portion of the camera main body 23 from the aperture 31 except for a rear surface portion so as to cover the camera main body 23. On the rear surface of the rear cover 28 behind the aperture 31, a back lid 29 is provided with a hinge on one side edge (not shown) of the rear cover 28 so as to block external light from behind. Have been.

FIG. 8 is an external perspective view of the screen size switching camera of the fourth embodiment shown in FIG. 7 with the back cover opened.

On one side of the upper surface of the front cover 21, there are provided a screen size switching knob 46 and a release button 47 for switching between non-trimming photographing (normal size photographing) and trimming photographing (for example, panoramic size photographing). It is arranged. The screen size switching knob 46 is integrally fixed to a distal end portion of a screen size switching shaft 40 described later, and is partially rotatable with respect to the camera body 23. And the knob 46
As shown in the figure, turning to the "N" position enables photography in the normal size, and turning to the "P" position enables photography in the panorama size. .

The back cover 29 is rotatably supported by a rotation center shaft vertically supported by one end of the rear cover 28 and is opened and closed. In the lower part of the figure, a fan-shaped back cover gear portion 42 is disposed inwardly around the rotation center axis, and when the back cover 29 is closed, a hole formed in the camera body 23 is formed. From inside the camera body 23. This back cover gear part 4
2 has a gear portion 42a only on the peripheral surface near the camera body 23.
(See FIG. 13), and meshes with a mask switching shaft drive gear 63 described later only when the back cover 29 is opened and closed. The back cover gear portion 42
Will be described in detail later.

FIGS. 9 to 12 are cross-sectional views showing the masks 36a and 36b and their peripheral portions in the fourth embodiment, partially seen through from the back side of the camera. 9 and 10 show a state where the back cover 29 is closed, and FIGS. 11 and 12 show a state where the back cover 29 is opened.

First, a description will be given with reference to FIG. This figure 9
Indicates that the screen size switching knob 46 specifies shooting at the normal size.
Is at the shooting position (N) in the normal size.

On one side (center in the figure) of the camera body 23, the screen extends from the bottom of the camera body 23 through the upper surface of the camera body 23 and further projects through the upper surface of the front cover 21. A size switching shaft 40 is provided. The screen size switching axis 40 is connected to the camera body 23.
Bearings 23a and 23b respectively formed in the upper bottom surface
Further, as described above, the screen size switching knob 46 is fixed to the end of the shaft 40 extending from the upper surface of the camera body 23 and projecting from the upper surface of the front cover 21 as described above. ing.

The upper portion of the screen size switching shaft 40, that is, the upper portion of the switching shaft 40 sandwiched between the upper surface of the camera body 23 and the front cover 21, has vertically symmetrical end cams 57 a,
A finder cam 57 having 57b is integrally formed on the outer peripheral surface of the switching shaft 40.

A finder frame 50 is formed on the left side of the finder cam 57 near the center of the camera. Also, the screen size switching shaft 40 is supported on the upper and lower sides of the finder cam 57 so as to be vertically slidable.
Two finder masks 51a and 51b are provided. The finder masks 51a and 51b have the shape of a strip extending from the screen size switching shaft 40 toward the finder frame 50, and the base ends thereof face the cam surfaces 57a and 57b of the finder cam 57. The cam followers 59a and 59b are formed at positions where the cam followers 59a and 59b protrude, and are in contact with the cam surfaces 57a and 57b, respectively. Spring catches 60a and 60b are formed on the base end surfaces of the finder masks 51a and 51b, respectively, and a tension spring 58 is provided between the spring catches 60a and 60b. Thus, the finder masks 51a and 51b are connected to the tension springs 5a.
8 urges in the direction approaching each other, and further moves up and down in directions opposite to each other as the finder cam 57 rotates.

The finder field frame 50 indicates the field of view of the finder at the time of non-trimming, that is, at the time of photographing in a normal size.

On the other hand, on the lower portion of the screen size switching shaft 40, that is, the lower portion of the switching shaft 40 sandwiched between the upper surface and the bottom surface of the camera body 23, the end face cams 45a, 45 which are vertically symmetrical.
The three-dimensional cam 45 having b is integrally formed on the outer peripheral surface of the screen size switching shaft 40.

The aperture 31 is formed on the left side of the three-dimensional cam 45 near the center of the camera. The two masks 36 slidable in the vertical direction with the screen size switching shaft 40 as a support shaft are provided above and below the three-dimensional cam 45.
a, 36b are provided. The masks 36a, 36b
Is the aperture 31 from the screen size switching axis 40.
The cam followers 39a and 39b are formed to project from the base end of the three-dimensional cam 45 at positions facing the cam surfaces 45a and 45b. Then, a torsion coil spring 38 described later is used.
When they are biased toward each other by a and 38b, they come into contact with the cam surfaces 45a and 45b, respectively. That is, in the state of FIG. 9, the cam followers 39a and 39b are in contact with the cam surfaces 45a and 45b.

At the base ends of the masks 36a and 36b, spring hooks 62a and 62b are formed so as to project toward the near side of the drawing. Further, torsion coil springs 38a, 38b are respectively provided between the spring plates 61a, 61b formed on one side of the charge plates 56a, 56b to be described later and also protruding toward the near side of the drawing. The torsion coil spring 38a,
38b are spring hooks 61a, 61 at their ends.
b, 62a, 62b so as to be rotatable.

The masks 36a, 36b and the charge plate 56 are formed by the torsion coil springs 38a, 38b.
a and 56b are biased and held in a direction away from each other in the vertical direction in the figure. That is, in the state of FIG. 9, the masks 36a and 36b are urged in directions approaching each other.

Further, the tips of the masks 36a and 36b are supported by a support shaft 43 arranged between the upper and lower surfaces of the camera body 23 so as to be vertically slidable.

On the right side of the screen size switching shaft 40, a mask switching shaft 4 rotatably supported by bearings 23c and 23d formed in the upper bottom surface of the camera body 23, respectively.
4 are provided. At the center of the mask switching shaft 44,
Left and right threaded sections 44a and 44
b is formed by threading.
The charge plate 56a, which is screwed with the screw portion and moves up and down in directions opposite to each other,
56b are provided. These charge plates 56a, 56
As for b, the above-mentioned spring hook portions 61a and 61b are formed so as to protrude toward the near side of the drawing on one side.

A mask switching shaft driving gear 63 is integrally provided below the mask switching shaft 44, and the mask switching shaft driving gear 63 is attached to the back cover 29.
Is engaged with the gear portion of the back cover gear portion 42 only at the time of opening / closing operation. That is, in the state of FIG. 9 in which the back cover 29 is closed, the back cover gear portion 42 and the mask switching shaft drive gear 63 are not engaged.

FIGS. 13 and 14 are sectional views of the meshing relationship between the back cover gear portion 42 and the mask switching shaft driving gear 63 as viewed from below the camera. FIG. 13 shows the back cover 29.
14 shows the closed state, and FIG. 14 shows the open state.

The back cover gear portion 42 is formed of a fan-shaped thin plate, and a gear portion 42 is provided on a part of the peripheral surface near the camera body 23.
a is formed. A recess 42b is formed near the center of the peripheral surface and at a position facing the mask switching shaft drive gear 63 when the back cover 29 is closed (see FIG. 13). Thus, in the closed state, the mask switching shaft drive gear 63 and the back cover gear portion 42 are not engaged.

When the back cover 29 is opened to shift from the closed state shown in FIG. 13 to the open state shown in FIG. 14, the gear portion 42a meshes with the mask switching shaft driving gear 63, whereby the mask switching is performed. The shaft drive gear 63 rotates. When the back cover 29 is further opened, the end of the back cover gear portion 42 is separated from the mask switching shaft driving gear 63, and the meshing relationship is terminated (see FIG. 14).

Next, the operation of the fourth embodiment will be described.

FIG. 10 shows a state in which the screen size switching shaft 40 has been rotated from the photographing position (N) at the normal size to the photographing position (P) at the panorama size and switched from the state shown in FIG. I have.

With the rotation of the screen size switching shaft 40, the finder cam 57 is moved to the cam follower 59.
The rotation between the cam surfaces 57a and 57b at the contact position of the cam surfaces 57a and 57b becomes shorter. Thus, the finder masks 51a and 51b move toward each other by the urging force of the tension spring 58, and cover the upper and lower portions of the finder frame 50 to mask. Accordingly, in FIG. 9, the finder masks 51a and 51b at the photographing position (normal position N) in the normal size.
Means that the camera has moved to the panorama size shooting position (panorama position P) as shown in the figure.

The three-dimensional cam 45 is connected to the cam follower 3
It rotates in the direction in which the length between the cam surfaces 45a and 45b at the contact positions of 9a and 39b becomes shorter. At this time, since the charge plates 56a and 56b are in a direction away from each other, the masks 36a and 36b are moved toward each other by the torsion coil springs 38a and 38b to cover the upper and lower portions of the aperture 31. Mask. Then, shooting in a panoramic size is performed in the state shown in FIG.

FIG. 11 shows the back cover 2 from the state shown in FIG.
9 shows a state when the shutter 9 is opened.

When the back cover 29 is opened, as described above,
The state shown in FIG. 13 shifts to the state shown in FIG. As a result, the mask switching shaft drive gear 63 and the mask switching shaft 44 rotate. As a result, the charge plates 56a and 56b move in a direction approaching each other, so that the torsional coil springs 38a and 38b move the masks 36a and 36b away from each other and retreat from the aperture 31. Then, the mask 36
b comes into contact with the locking portion 64, so that the masks 36a, 36a
6b is held in the normal position. Further, the state of the finder masks 51a and 51b does not change, and holds the panorama position shown in FIG.

In this state, when the back cover 29 is closed,
Contrary to the above, the charge plates 56a, 56b move in a direction away from each other, and the masks 36a, 36b move in a direction approaching to mask the aperture 31. That is, the state returns to the state shown in FIG.

FIG. 12 shows the state shown in FIG.
Shows the state when is opened.

Also in this case, when the back cover 29 is opened, the state shown in FIG. 13 shifts to the state shown in FIG. 14 as described above. As a result, the mask switching shaft drive gear 63 and the mask switching shaft 44 rotate. Accordingly, the charge plates 56a and 56b move in directions approaching each other. The masks 36a and 36b are already in the three-dimensional cam 4.
5, it is held at a position retracted from the aperture 31, but is slightly moved and held in a direction further away from each other by the torsion coil springs 38a and 38b.
Then, the masks 36a and 36b are held at the normal position by the abutment of the masks 36b with the locking portions 64. In addition, the state of the finder masks 51a and 51b does not change, and holds the normal position shown in FIG.

That is, even if the back cover 29 is opened from the normal state shown in FIG. 9, the masks 36a and 36b and the finder masks 51a and 51b maintain their normal positions.

In this state, when the back cover 29 is closed,
Contrary to the above, the charge plates 56a and 56b move in the direction away from each other, and the masks 36a and 36b are urged in the direction approaching each other by the torsion coil springs 38a and 38b. It is regulated and has evacuated from the aperture 31. That is, the state returns to the state shown in FIG.

As is clear from the above description, the screen size switching axis 40 can be switched between the normal position (see FIG. 9) and the panoramic position (see FIG. 12) with the back cover 29 opened. The masks 36a and 36b and the finder masks 51a and 51b secure a normal position and are always retracted from the aperture 31.

Further, when the back cover 29 is closed and the screen size switching shaft 40 is kept at the panoramic position (see FIG. 11) and the back cover 29 is closed, the operation reverse to the above is performed, and the masks 36a, 36b Moves to the panorama position and the aperture 3
1 is masked.

FIG. 16 is a flowchart showing the switching operation between the back cover and each mask according to the fourth embodiment described above.

First, it is assumed that the masks 36a and 36b and the finder masks 51a and 51b are both at the normal position (indicated as N in the figure) and the back cover 29 is in the closed state (step S101). Here, when the screen size switching input is performed (step S102), the mask 36 is input.
Both a and b and the finder masks 51a and 51b move to the panoramic position (indicated as P in the figure) (step S103).

Thereafter, when the back cover 29 is opened (step S104), the masks 36a and 36b move from the panorama position to the normal position, and move to the finder mask 51.
a and 51b hold the panorama position (step S
105). Thereafter, when the back cover 29 is closed (Step S106), the masks 36a and 36b move from the normal position to the panoramic position (Step S107).

When the screen size switching input is not made in step S102, regardless of whether the back cover 29 is opened or closed,
The masks 36a and 36b and the finder mask 5
The states of 1a and 51b do not change (steps S108,
Step S109).

According to the fourth embodiment, the mask 3
The drive mechanism of 6a, 36b is skillfully connected to the opening / closing operation of the back cover 29. When the back cover 29 is opened, the masks 36a, 36
Since b is retracted to the outside of the aperture 31, there is no risk of the user accidentally touching and damaging it, and a highly reliable camera is obtained.

When the back cover 29 is closed, the masks 36a and 36b return to the state specified by the operation means, and the finder masks 51a and 51b as display means are provided.
The screen size switching axis 40, which serves both as a display means and an operation means, does not correspond to the opening and closing of the back cover 29 and maintains a designated state, so that the camera is easy to use without causing confusion to the user.

Next, a fifth embodiment of the present invention will be described.

The screen size switching camera of the fifth embodiment basically has the same configuration as that of the fourth embodiment, and has a central vertical cross section viewed from the side as shown in FIG.

FIG. 15 is a rear view and a block circuit diagram showing a main part of the screen size switching camera of the fifth embodiment. This figure is a view seen from the back side, that is, from the film side, of the screen size switching camera of the fifth embodiment. Have been.

The camera main body 23 is provided with a support shaft 122 on the left side of the aperture 31 and a screen size switching shaft 141 rotatable parallel to the coaxial 122 on the right side. The upper half of the screen size switching shaft 141 has a right-hand thread 141a and the lower half has a left-hand thread 141b. The right-hand thread 141a has an upper mask 36a, and the left-hand thread 141b has a lower mask 36b. The aperture 31
While being screwed symmetrically up and down,
These masks 36a and 36b are also slidably engaged with the support shaft 122. Then, the masks 36a, 36
6b is movable to a position (normal position) N retracted to the outside of the aperture 31 and a position (panoramic position) P projecting slightly inward to regulate the exposure range of the panoramic photograph.

The upper portion of the screen size switching shaft 141 projects into a gear cover 142 fixed to the camera body 23, and a gear 141c is integrally provided. This gear 141c meshes with a pinion gear 146 of an output shaft of a motor 145 integrally supported by the camera body 23 via a second reduction gear 143 and a first reduction gear 144. On the other hand, this pinion gear 146 has
The photo-interrupter gear 147 is meshed with a light-shielding propeller-like blade formed on the photo-interrupter gear 147, and the photo-interrupter 148 photoelectrically detects the amount of rotation of the photo-interrupter gear 147. ing.

The first reduction gear 144, the second reduction gear 143, and the photo-interrupter gear 147 are rotatably supported by the camera body 23, and are held by a gear cover 142.

The upper mask 36a has a projection 36f projecting from the right end face thereof. The projection 36f is an N switch (normal position detection switch) 149 or P which is integrally supported by the camera body 23. The switch (panorama switch) 150 is engaged so that the N switch 149 and the P switch 150 are turned on and off. The N switch 149 and the P switch 150
This is a so-called leaf switch, which is a mask 36a, 36b
Is N (normal position), the N switch 149 turns off, the P switch 150 turns on, and the mask 36a,
N switch 149 when 36b is P (panorama position)
Are turned on, and the P switch 150 is turned off.

The N switch 149 and the P switch 1
50 are both connected to a control circuit 151, and the above-described motor 145 and photointerrupter 148
2 through a control circuit 151. This drive circuit is constituted by a bridge circuit using a power transistor or the like.

The control circuit 151 includes a power supply unit 153 which is a so-called main switch capable of switching the camera between an OFF state where photographing is not possible and an ON state where photographing is possible, and N ( normal),
Switching operation means 154 for instructing P (panorama), lens frame extension control means 155 for controlling the movement of the lens frame in the optical axis direction and controlling the focusing operation, and exposure means 156 for controlling the opening and closing of the shutter blades. Back cover opening / closing detecting means 157 configured to turn on / off a leaf switch, which is a well-known switch means, at a part of the back cover; and detecting that the film is in a rewinding state. A rewind state detecting means 158 for sending a signal to the means and a film feed motor 159 driven by the drive circuit 152 for driving a film feed means (not shown) to wind and rewind the film are connected. I have. Note that the switching operation means 154 is an electrical switch that outputs a switching instruction for each pressing operation, and does not particularly have a display function or the like. Further, the power supply means 153 is constituted by a switch capable of switching the camera between an off state where photographing is not possible and an on state where photographing is possible, and is connected to the control circuit 151. In this embodiment, it is on.

The control circuit 151 further provides L
The finder mask L via the CD drive circuit 161
It is connected to CD162. The LCD 62 is disposed in the finder optical path, and shows a state (N) in which the finder field of view is displayed as it is in response to a normal photographing state.
The LCD drive circuit 161 is driven to switch between a state (P) in which the upper and lower parts of the viewfinder are shielded from light corresponding to the panorama shooting state.

The operation of the fifth embodiment configured as described above will be described.

In the state where the back cover 29 is closed by the back cover opening / closing detecting means 157 and this information is output to the control circuit 151, that is, in the state where the back cover 29 is closed, FIG. The masks 36a, 3 indicated by solid and medium lines
When the switch 6b is in the normal position, the switching operation means 15
When the panorama position is designated by the step 4, the insulator control circuit 1
According to the output of 51, the driving circuit 152
Start 45. Then, the rotation of the motor 145 is reduced by the gears and transmitted to the screen size switching shaft 141, and the screen size switching shaft 141 rotates in the white arrow direction in FIG.

As a result, the masks 36a and 36b move toward each other, the N switch 149 turns from off to on, and the photo interrupter 148 outputs the rotation of the photo interrupter gear 147 as a pulse signal. When the masks 36a and 36b are at the panoramic position, P
The switch 150 is turned off, and the control circuit 151 stops the motor 145 by this signal. As described above, the screen size changes from the normal size to the panorama size.

At the same time, the control circuit 151
The finder mask portion 162 is shielded from light, and masks the top and bottom of the finder field of view.

Further, when the screen size is switched from the panoramic size to the normal size, the motor 145 is rotated in the reverse direction and the screen size switching shaft 141 is switched in the same manner as described above.
Are rotated in the direction of the black arrow in FIG.
Moves from the panorama position to the normal position. And
When the N switch 149 is turned off, the motor 145 stops, and the panorama state is switched to the normal state. Similarly, the LCD 162 switches from the panoramic state to the normal state.

On the other hand, when the back cover 29 is opened while the LCD 162 is in the panoramic state, the open state is detected by the back cover open / close detecting means 157, and this information is input to the control circuit 151. Then, under the control of the control circuit 151, the LCD 162 switches from the panoramic state to the normal state, and switches to the normal position state of the masks 36a and 36b. Thereafter, even if the back cover 29 is closed again, the LCD 1
Both 62 and the masks 36a and 36b maintain a normal state.

The operation of the masks 36a and 36b and the LCD 162 in accordance with the opening / closing operation of the back cover 29 is shown in FIG.
This will be described with reference to the flowchart shown in FIG.

First, the masks 36a, 36b and L
It is assumed that both the CDs 162 are in the normal position (indicated as N in the figure) and the back cover 29 is in the closed state (step S20).
1). Here, when the screen size switching input is performed (step S202), the masks 36a, 36b and LC
Both D162 move to the panorama position (indicated as P in the figure) (step S203).

Thereafter, when the back cover 29 is opened (step S204), the masks 36a and 36b and the LCD 1
In both cases, the panorama position moves from the panorama position to the normal position (step S205). Thereafter, the state does not change even if the back cover 29 is closed (step S206).

When the screen size switching input is not made in step S102, the state of the masks 36a and 36b and the LCD 162 does not change regardless of the opening / closing of the back cover 29 (step S207, step S20).
8).

As described above, according to the fifth embodiment, when the back cover is opened in the panoramic state, the mask is in the retracted position, so that there is no risk of the user touching the mask and being damaged, and the reliability is high. Became a camera. Even if the back cover is opened in the panoramic state, both the mask and the LCD are in the normal state, and the normal state is maintained even when the back cover is closed. This resets the camera to a state that makes it easy to use.

Next, a sixth embodiment of the present invention will be described.

Since the configuration of the screen size switching camera of the sixth embodiment is the same as that of the fifth embodiment, only the operation will be described here with reference to the flowcharts shown in FIGS.

FIG. 16 shows a switching operation in a state where no film is loaded. This is the same as in the fourth embodiment, and a description thereof will be omitted.

FIG. 18 shows switching in a state where a film is loaded.

In the case where the photographing and winding are performed normally, the masks 36a and 36b and the LCD 162 are switched according to the switching operation. Next, when rewinding of the film is started in the panoramic state, the masks 36a, 36b, L
The CD 162 is in the normal state, and thereafter, the normal state is maintained until the back cover 29 is opened to remove the film that has been rewound and the back cover 29 is closed, and the switching operation input is performed. Do not accept.

Next, when a switching operation is input, both the mask and the LCD 162 enter the P state according to FIG. 16 or FIG.

As described above, according to the sixth embodiment, when the back cover is opened, the mask retreats, so that there is no possibility that the mask will be touched by the user and the camera will be highly reliable.

Further, since the mask is retracted when the film is rewound, there is no possibility that the mask may be damaged by the leader of the film touching the mask immediately before the rewinding is completed. Also,
Along with the rewinding of the film, the switching is in a normal state which can be called a normal mode, so that the camera is easy to use.

The timing for retracting the mask is as follows.
It does not matter whether rewinding is started or not.

Also, the amount of projection of the mask into the aperture,
That is, the screen size is, for example, a so-called panoramic size of 36 mm wide × 12 mm long or a width of 36 mm for a 35 mm film.
A so-called high-definition size of 20.25 mm in height may be used, and in this embodiment, the vertical direction is trimmed. However, the so-called half size of 18 mm in width and 24 mm in height may be trimmed in the horizontal direction. Further, in this embodiment, the protruding position of the mask is one place. For example, in the fifth embodiment and the fifth embodiment, the P switch is arranged corresponding to the panorama size, and the high-vision size is a pulse signal of the photo interrupter. It is also possible to switch the screen size between three types of screen sizes (normal, high-definition, panoramic) or steplessly by controlling the position of the mask.

Next, a seventh embodiment of the present invention will be described.

Since the configuration of the screen size switching camera of the seventh embodiment is the same as that of the fifth embodiment, only the operation will be described here with reference to the flowcharts shown in FIGS.

The operation of the seventh embodiment is basically the same as that of the fifth embodiment, and performs the same operation as the flowchart shown in FIG. In addition to this, the operation when the power is turned on / off is shown in the flowchart of FIG.

First, at the start, the power is off and the masks 36a and 36b and the LCD 162 are in a normal state (indicated by N in the figure) (step S401). After this,
The power is turned on (steps S402, S403, S40)
When the screen size is switched (step S407), the masks 36a and 36b and the LCD 162 all enter a panoramic state (step S408). Here, when the power is turned off (step S409), the masks 36a and 36b and the LCD 162 are all in a normal state (step S410), and the process ends.

The masks 36a, 36b, LCD
162 are both in the normal state (step S40)
5, when power is turned off (step S414) (step S40)
4) The masks 36a and 36b and the LCD 162 remain in the normal state (step S413), and the process ends.

As described above, according to the seventh embodiment, in addition to the effects of the fifth embodiment, the camera returns to the normal state, which is the normal mode, in conjunction with the power-off, so that the camera is easy to use.

In the seventh embodiment, the mask is set to the normal state in conjunction with the power-off. However, the mask may be shifted to the normal state in conjunction with the power-on.

[0110]

As described above, according to the present invention, the mask member is always held at the normal size photographing position except during exposure, so that when the screen size is switched,
It is possible to provide a screen size switching camera in which the mask member is not likely to be damaged even when the back cover is opened.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a screen size switching camera according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the screen size switching camera of the first embodiment.

FIG. 3 is an enlarged perspective view of a main part showing a mask and its peripheral part in the screen size switching camera of the first embodiment.

FIG. 4 is a side view showing a mask, a three-dimensional cam, a switching member, and its peripheral portion in the screen size switching camera of the first embodiment.

FIG. 5 is an enlarged side view of a main part of a screen size switching camera according to a second embodiment of the present invention.

FIG. 6 is an enlarged side view of a main part of a screen size switching camera according to a third embodiment of the present invention.

FIG. 7 is a central vertical sectional view of a camera for switching a screen size according to a fourth embodiment of the present invention.

FIG. 8 is an external perspective view of the screen size switching camera of the fourth embodiment with the back cover opened.

FIG. 9 is a cross-sectional view showing the configuration of the mask and its peripheral portion when the back cover is in the closed state and in the normal state in the fourth embodiment.

FIG. 10 is a cross-sectional view showing the configuration of a mask and its peripheral portion when the back cover is in a closed state and in a panoramic state in the fourth embodiment.

FIG. 11 is a cross-sectional view showing the configuration of a mask and its peripheral portion when the back cover is in an open state and in a panoramic state in the fourth embodiment.

FIG. 12 is a sectional view showing the configuration of a mask and its peripheral portion when the back cover is in an open state and a normal state in the fourth embodiment.

FIG. 13 is a cross-sectional view showing an engagement relationship between a back cover gear portion and a mask switching shaft driving gear when the back cover is in a closed state in the fourth embodiment.

FIG. 14 is a cross-sectional view showing an engagement relationship between a back cover gear portion and a mask switching shaft driving gear when the back cover is in an open state in the fourth embodiment.

FIG. 15 is a sectional view and a block circuit diagram showing a main part of a screen size switching camera according to a fifth embodiment of the present invention.

FIG. 16 is a flowchart showing an opening / closing operation of a back cover and an operation of switching between masks in the screen size switching camera of the fourth embodiment.

FIG. 17 is a flowchart showing the operation of opening and closing the back cover and the operation of the mask and the LCD in the screen size switching camera of the fifth embodiment.

FIG. 18 is a flowchart showing a screen size switching operation when no film is loaded in the screen size switching camera according to the sixth embodiment of the present invention.

FIG. 19 is a flowchart showing an operation by power supply switching in a screen size switching camera according to a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera main body 2a, 2b ... Mask 2c, 2d ... Cam follower part 3 ... Solid cam 4a, 4b ... Toggle spring 5a, 5b ... Switching member 6 ... Driven gear 12 ... Aperture part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-95428 (JP, A) JP-A-5-150385 (JP, A) JP-A-5-142681 (JP, A) 122435 (JP, U) Japanese Utility Model Hei 5-66634 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03B 17/28

Claims (3)

(57) [Claims] 1. An image processing apparatus, comprising:
A mask member movable between a protruding position projecting into the photographing screen area and a retracted position retracting from the photographing screen area; operating means for designating a position of the mask member at the time of exposure; Display means for performing display in accordance with instructions from the operation means; a back cover rotatable between a closed position for shielding at least a part of the photographing screen and an open position for exposing the same; Interlocking means capable of displacing the position of the mask member, and wherein when the back cover is turned from the closed position to the open position while the mask member is at the projecting position, The mask member is displaced to the retracted position by the interlocking means, and the mask member is displaced to the protruding position by the interlocking means when the back cover is turned to the closed position again. Screen size switching La. 2. The display means displays a position of the mask member by switching a finder field of view, and responds to designation of the operation means regardless of displacement of the position of the mask member in response to opening and closing of the back cover. 2. The screen size switching camera according to claim 1, wherein the image is displayed. 3. A camera is disposed between a photographing lens and a photographing screen,
A mask member movable between a protruding position protruding within the photographing screen area and a retracted position retracting from the photographing screen area ; operating means for designating a position at the time of exposure of the mask member ; the mask member comprises a mask biasing member for urging the one between the projecting position and the retracted position, and a biasing direction selection means for selecting the biasing direction of the mask biasing member, the The mask member at the time of exposure by operating means
If the position of the is specify that such a projecting position
, Said actuates the biasing direction selection means at the time of photographing exposure
Moving the mask member to the protruding position by the urging force of the urging means, and activating the urging direction selecting means at the end of the exposure to move the mask member to the retracted position by the urging force of the urging means. Features a screen size switching camera.