JP3162743B2 - Camera for switching the shooting screen size - 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 for switching a photographing screen size , and more particularly, to a camera having a built-in film of a first kind.
Contains one type of patrone and a second type of film
Selectively loading a second type of patrone
About the possible shooting screen size switching camera.

[0002]

2. Description of the Related Art Conventionally, as a camera capable of switching the size of a photographing screen using a roll film, Japanese Patent Publication No.
The one disclosed in JP-A-14234 is known. In this camera, the switching of the mask plate on the shooting screen and the switching of the size of the finder window are simultaneously performed, and the size of the shooting screen can be changed from outside the camera at any time according to the purpose of shooting in the same camera. The photographing is performed while changing the distance between the photographing screens, and the size of the photographing screen is displayed in a finder window.

Japanese Patent Application Laid-Open No. 58-142324 discloses a large-sized camera using a brownie plate film, which can use a 135-type film in addition to the brownie plate film. It is shown. This means that a film winding drive unit, which is operated by a winding lever provided on the camera body so as to be switchable between a film winding section for a brownie plate and a film winding section for a 135-type film cartridge, is provided in the camera body. At the same time, the film winding section of the brownie plate and the 135 type film cartridge winding section each have a built-in film winding mechanism interlocked with the film winding drive section.

Although the photographing screen is not switched, Japanese Utility Model Publication No. 48-37575 discloses a film photographed by using the same kind of film cartridge with a different screen size by observing the appearance of the film cartridge. It is shown that the screen size of the film in the same cartridge is identified.

Further, Japanese Patent Application Laid-Open No. 56-36629 discloses that when a film cartridge is loaded into a camera, the shape of the spool shaft of the film cartridge (the depth of a fitting hole formed in the spool shaft) is determined. By detecting the difference, the type of the film stored in the same film cartridge, for example, the ASA sensitivity of the film is identified,
An apparatus capable of automatically adjusting the exposure of the camera is shown.

Further, Japanese Patent Publication No. Sho 44-2540 discloses that
An uneven portion for setting the film sensitivity is provided on the outside of the film cartridge, and by detecting this, the above described Japanese Patent Application Laid-Open No.
An apparatus is disclosed in which the sensitivity of a film in a film cartridge is identified and the exposure of a camera is automatically adjusted, similarly to the proposal in JP-A-6-36629.

[0007] Similarly, as a means for identifying the type of film, Japanese Patent Application Laid-Open No. 57-202524 provides a code indicating the sensitivity of the film on the outside of the film cartridge, and detects the code to identify the film. A device for automatically setting a suitable film speed has been proposed.

[0008]

By the way, in such a conventional camera capable of switching the photographing screen size, the photographing screen size is switched manually, and the switching mechanism is also complicated. ing. In the photographing screen switching means disclosed in Japanese Patent Publication No. 36-14234, for example, when a 135 type film cartridge is used, the photographing screen is changed to 24 mm × 3.
It is only possible to change the length of the film in the feeding direction so as to change from the standard size of 6 mm to the half size of 24 mm × 18 mm. Cannot be changed. Therefore, although it is easy to perform photographing while reducing the photographing screen to the above-mentioned half size, it is difficult to obtain a photographing screen larger than the standard size because only the feeding direction can be enlarged.

Further, the technical means disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-142324 is limited to a large camera using a large film such as a brownie plate.
It cannot be applied to a camera that can only load a 5-inch film cartridge. Moreover, the size of the photographing screen is changed only by loading films having completely different sizes. For example, the photographing screen cannot be changed using only the 135-type film cartridge.

By the way, the film loaded in the 135 type film cartridge has JIS standard K7.
519-1982 "135 type film patrone" or ISO standard 1007 "Photography-135-size f
As specified in "ilm and magazine-Specification" etc., perforations are provided on both sides. Due to the existence of this perforation, the effective photographing width is only 25.4 mm for a film width of 35 mm. For this reason, the standard photographing screen size is 24 mm ×
In the direction perpendicular to the film feeding direction, the effective utilization ratio is 70% or less, that is, 24/35 = 0.69. Therefore, in the standard photographing screen size, the width of the photographing screen is increased to the full film width of 35 mm to increase the effective utilization rate.
The enlargement ratio at the time of printing is increased, and the image quality of the printed image is inevitably reduced.

The above-mentioned perforation is originally
This is provided for intermittent feeding of movie film, and is not always necessary for a normal still camera. Therefore, if the shooting screen is enlarged by eliminating this perforation, the enlargement ratio at the time of printing can be reduced, and a high-quality print image can be obtained.

Incidentally, the above-mentioned JP-A-56-36629, JP-B-44-2540 and JP-A-57-20 are disclosed.
Japanese Patent No. 2524 discloses an apparatus for automatically discriminating the type of a film stored in a film cartridge, but in any case, the apparatus identifies the film sensitivity. It does not mention films with different shooting screen sizes. The present invention has been made in view of such a problem. First, for example, a film in which perforation in a roll film is abolished is proposed, and then a film having a perforation is provided.
In addition to providing a film cartridge in which the film is stored, for example, while maintaining compatibility with a JIS 135-type film cartridge, accommodating a film in which the perforation is abolished, and which can be distinguished from the 135-type film cartridge, When there is perforation in the film loaded in the camera body, shooting is performed at the conventional standard shooting screen size, and when there is no perforation in the loaded film, the shooting screen size is larger than the standard size. It is an object of the present invention to provide a photographing screen size switching camera capable of photographing with a camera.

[0013]

According to a first aspect of the present invention, there is provided a camera for switching a photographing screen size, comprising:
And a second type of patrone having a built-in film of the first type and a second type of patrone having a built-in film of the second type. Photographing screen size setting means capable of switching between a first screen size corresponding to an image recording area of the second type of film and a second screen size corresponding to an image recording area of the second type of film; Patrone discriminating means for discriminating the type of the patrone, and receiving the output of the patrone discriminating means, and when the first kind of patrone is loaded, sets the photographing screen size set by the photographing screen size setting means to the first screen. When the patrone of the second type is loaded, the photographing screen size set by the photographing screen size setting means is the second size. Characterized by comprising a switching means for the screen size, the. In order to achieve the above object, a second photographing screen size switching camera according to the present invention comprises:
Wherein the patrone discriminating means discriminates a shape of a film winding spool shaft provided on the patrone. In order to achieve the above object, a third shooting screen size switching camera according to the present invention includes a first type of patrone in which a film provided with a perforation on a side edge portion is not provided, and the perforation is not provided. A camera having a built-in film and capable of selectively loading the above-described patrone and a second type of patrone in which the shape of the spool shaft is changed, wherein the camera has a screen area at least inside the perforation. A photographing screen size setting means capable of switching between a screen size of 1 and a second screen size in which an area corresponding to perforation is also a screen area; a spool axis discriminating means for discriminating the shape of the spool shaft; Means, and when the first type of patrone is loaded, the photographing screen size setting step is performed. Is set to the first screen size, and when the second type of patrone is loaded, the shooting screen size set by the shooting screen size setting means is set to the second screen size. Switching means.

[0014]

The first photographing screen size switching camera has the first
Is a camera capable of selectively loading a first type of patrone having a built-in type of film and a second type of patrone having a built-in second type of film, and has a shooting screen size. The setting means switches between a first screen size corresponding to the image recording area of the first type film and a second screen size corresponding to the image recording area of the second type film. The type of the patrone is determined. Further, upon receiving the output of the patrone discriminating means, when the patrone of the first type is loaded by the switching means, the photographing screen size set by the photographing screen size setting means is set to the first screen size, When a second type of patrone is loaded, the shooting screen size set by the shooting screen size setting means is set as the second screen size. In the second photographic screen size switching camera, in the first photographic screen size switching camera, the patrone determining means determines a shape of a film winding spool shaft provided on the patrone. The third photographing screen size switching camera includes a first type of patrone in which a film provided with a perforation on a side edge portion, a film in which a film without the perforation is provided, and the patrone and a spool are provided. A camera capable of selectively loading a second type of patrone having a changed axis shape, wherein the photographing screen size setting means sets a screen area at least inside the perforation as a first screen size. Then, the area corresponding to the perforation is switched to the second screen size in which the area corresponding to the perforation is also a screen area, and the shape of the spool shaft is determined by the spool shaft determining means. Further, upon receiving the output of the spool axis discriminating means, when the first kind of patrone is loaded by the switching means, the photographing screen size set by the photographing screen size setting means is set to the first screen size, When a second type of patrone is loaded, the shooting screen size set by the shooting screen size setting means is set as the second screen size.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to description of an embodiment of a camera for switching a photographing screen size according to the present invention, a normal film cartridge containing a film having a perforation and a present invention containing a film having no perforation are described.
To the picture-format switching cameras for difference in shape between the applicable film cartridge will be described with reference to FIGS.

FIG. 8 shows a state in which a leader portion of a perforated film 52a is pulled out from a normal 135-type film cartridge 5. The detailed size of this film 52a is shown in FIG.
(A) and (b) and Table 1 below, and the detailed size of the 135 type film cartridge 5 is shown in FIG. 27 and Table 2 below.

[0017]

[Table 1]

[0018]

[Table 2]

FIG. 9 is a photographing screen size switching camera according to the present invention.
It illustrates an example of applicable film patrols conservation in La. The film cartridge 58 has exactly the same dimensions as the 135-type film cartridge 5, except that the projecting length of the projecting spool shaft 5b is shorter than the projecting length of the projecting spool shaft 5a of the 135-type film cartridge 5. And the film patrone 58
A large-screen photographing film 52b having a width of 35 mm and having no perforation is accommodated therein. FIG. 9 is a view showing a state where the leader of the film 52b is pulled out from the film cartridge 58.

FIG. 10 shows a photographing screen size according to the present invention.
A show other examples of applicable film patrols conservation in switching the camera, the film cartridge 59,
The diameter of the spool shaft 5c is smaller than the diameter of the spool shaft 5a of the 135 type film cartridge 5.
Other dimensions of the film cartridge 59 are the same as those of the above-mentioned 13
It is formed in exactly the same manner as the type 5 film cartridge 5, and in the film cartridge 59, a 35 mm wide large-screen photographing film 52c having no perforation.
Is stored. FIG. 10 shows the film cartridge 5
9 shows a state where the leader portion of the film 52c is pulled out.

The film cartridge configured as described above is used in the camera of the present invention.

Hereinafter, an embodiment of a camera for switching a photographing screen size according to the present invention will be described with reference to the drawings.

FIG. 1 is a rear view of a photographing screen size switching camera according to a first embodiment of the present invention, in which a rear lid is removed.

This camera has a normal photographing function in addition to the function according to the configuration described below.
As shown in the front view of FIG. 2, the release button 2 and the camera
, A photographic lens 4 disposed in the center of the front of the camera
The viewfinder window 3 disposed above the camera has the same function as a normal camera. The photographing lens 4 has an image circle larger than that of a normal camera for the reason described later.

As shown in FIG. 1, the patrone loading chamber 11, which is a film supply chamber, is provided with the JIS K7519.
A 135-type film cartridge 5 (indicated by the broken lines indicated by dimensions α, β, γ, and δ in the figure, whose outer shape is specified) can be mounted as shown in FIG. The dimensions α, β, γ, and δ are values shown in Table 3 below.

[0026]

[Table 3]

On the ceiling wall of the patrone loading chamber 11,
Fork 1 for electric rewinding of the film cartridge 5
2 are provided, and are driven by a motor (not shown). The finder eyepiece 13 is
An eyepiece of a finder optical system 30 (see FIG. 4), which will be described later, is provided at the upper center of the rear surface of the camera body 1.

Then, on the center rear side of the camera body 1,
A mask portion 14 that forms a photographing screen range is formed. In the present embodiment, the mask portion 14 has, for example, a vertical dimension h =
29 mm and the lateral dimension w = 40.75 mm. As a result, the photographing screen is set to have an aspect ratio of 1: √2, which is similar to the ISO standard A size. Also, by setting the above dimensions, the diagonal length of the shooting screen is about 5
0.0 mm, the diagonal length of the conventional shooting screen, about 4
It is longer than 3.3 mm. Therefore, the image circle of the photographing lens 4 is set to a value larger than that of the photographing lens of a normal camera.

In this embodiment, as described above,
The size of the photographing screen is set to an aspect ratio of 1: √2, which is similar to the size of the A-size paper. However, the set value is not limited to the above-described ratio, and is generally used in the United States, for example. , Letter size, legal size, etc., or other aspect ratios similar to paper sizes used in other countries may be employed.

The mask section 14 in the camera body 1
A photographing screen mask switching mechanism 40, which will be described later, is provided in the inside of the camera, and the photographing screen can be switched by this.

Further, at the upper and lower positions of the mask portion 14,
Film rails 15, 16, 17, and 18 are arranged in the film feeding direction, and the outer film rails 15 and 18 and the inner film rails 16 and 17 have the same rail surface, respectively. I have.

FIG. 3 shows these film rails 15 and 1.
6 is a longitudinal sectional view of the film cartridge 6, 17, 18, showing a film 52 a (52 b, 52 b) loaded in the film cartridge 5.
c) shows a state in which the rear cover (not shown) is closed after being pulled out and expanded, and the film pressure plate 51 disposed inside the rear cover is, as is well known, The inside of the upper and lower edges is the film rail 15,
The central portion of the film is pressed inward by the film pressure plate 51 so that flatness is obtained. A film 52a (52) is provided between the film pressure plate 51 and the front surfaces of the inner film rails 16 and 17.
(b, 52c) is formed to feed the film smoothly. In addition, the film rails 15, 1
The length g (see FIG. 1) of the inside between 8 is slightly larger than the film width of 35 mm, as in the case of a normal camera, in order to facilitate sliding of the film.

Returning to FIG. 1, a film winding chamber 29 is provided on the opposite side of the patrone loading chamber 11 with the mask section 14 interposed therebetween. Spool shaft 1 for film winding of the same type as camera
9 are provided. A rubber belt 20 having a large frictional force is wound around the center of the spool shaft 19 in order to ensure film loading even for a film having no perforation.

When the film cartridge 5 is loaded in the cartridge loading chamber 11 and the leader unit is placed on the spool shaft 19 and the rear cover (not shown) is closed, the spool shaft 19 is closed by a rear cover switch 103 (described later). 20) is turned on, and at the same time, a built-in hoisting / rewinding motor 108 (see FIG. 20) is operated by a CPU 101 (see FIG.
0) is controlled by a film winding / rewinding drive circuit 107 (see FIG. 20) that operates according to the instruction, automatically rotates in a predetermined direction, and winds up the film leader. The film is wound up by one frame.

Auxiliary rollers supported on auxiliary roller arms 71a and 71b (see FIG. 16) whose base ends are swingably attached to the camera body 1 are attached to the rubber belt 20 of the spool shaft 19, respectively. 21 is disposed so that its roller surface is in contact with the surface of the rubber belt 20. When the film 52a (52b, 52c) is loaded by the rotation of the spool shaft 19, the auxiliary roller 21 serves to assist the winding of the film around the spool shaft 19.

A film feed amount detecting roller shaft 22 is disposed in parallel with the spool shaft 19 at a position near the auxiliary roller 21 and near the mask portion 14. Detection rollers 22a and 22b formed of rubber having a large frictional force are wound around the upper and lower portions of the roller 22, respectively. When the film 52a (52b, 52c) is loaded, the detection rollers 22a and 22b abut on the inner upper and lower ends of the film, and rotate in conjunction with the loading of the film. Therefore, the film feed amount detecting roller shaft 22 rotates according to the feed amount of the film 52a (52b, 52c). And the detection roller shaft 2
2, an upper shaft portion 22c extending into the camera body 1 has a pulse generating mechanism 6 for detecting a film feeding amount described later.
The rotation plate 61 is fixed to generate a pulse signal corresponding to the rotation amount of the film feed amount detection roller shaft 22, whereby the CPU 101 measures the film feed amount. I can do it.

In the bottom of the cartridge loading chamber 11, a cartridge pool shaft shape detector 23 for determining the shape of the spool shaft of the loaded film cartridge is provided.

FIGS. 11 and 12 are views showing the structure and operation of the patrone pool axis shape detector 23, and are enlarged cross-sectional views of the main part of the lower part of the patrone loading chamber 11. As shown in FIGS.

FIG. 11 shows that the patrone loading chamber 11
FIG. 4 is a diagram showing a detection state of the patrol pool axis shape detection unit 23 when a normal 135-type film cartridge 5 is loaded.

As shown in the drawing, the patrone pool axis shape detecting unit 23 comprises two strip-shaped elastic conductive plates having free ends extending below the patrone loading chamber 11. For example, it is constituted by a switch including contact springs 54a and 54b made of phosphor bronze or the like.
The contact springs 54a and 54b are opposed to each other, and their bases are fixed to an insulating member 55b. The bases of the contact springs 54a and 54b are formed on the bottom surface of the patrone loading chamber 11 and the patrone loading chamber 11 of the camera body 1. It is inserted into and fixed to a through hole 55 a formed at the intersection with the center-side wall 55, and its tip extends out along the bottom surface of the patrone loading chamber 11. Then, the lower contact spring 54
The tip of b has a curved portion such that the top portion faces the spool shaft 5a of the fimpatrone 5,
The apex portion serves as a contact, and the upper contact spring 54a
Are arranged so as to face the contact point. The base end of the contact spring 54b is connected to the input terminal P6 of the CPU 101.
(See FIG. 20).

The upper contact spring 54a is disposed such that the tip is located between the tip of the contact spring 54b and the spool shaft 5a. Only when a normal film cartridge (film cartridge 5 shown in FIG. 5) is loaded in the cartridge loading chamber 11, the free end of the contact spring 54a is pushed downward by the projecting lower end of the spool shaft 5a, The switch is turned on by contact with the contact point of the contact spring 54b. That is, when the film cartridge 5 is loaded, the lower end surface of the spool shaft 5a pushes the free end of the contact spring 54a from the upper surface,
Since the free end is displaced downward, the contact located below the free end and the apex of the curved portion of the contact spring 54b come into contact, and the switch is turned on.

The base of the contact spring 54a is connected to the CP
The type of the film cartridge loaded with the CPU 101 (that is, the presence or absence of film perforation) is connected to the input terminal P5 of U101 (see FIG. 20) and depends on the presence or absence of a short circuit between the contact springs 54a and 54b. Can be detected.

FIG. 12 shows that the patrone loading chamber 11
The state of the patrol pool shaft shape detecting unit 23 when the film cartridge 58 having a short length of the spool shaft 5b is loaded is shown.

As shown in the figure, since the spool shaft 5b of the loaded film cartridge 58 has a short length, the lower end surface of the spool shaft 5b does not contact the free end of the contact spring 54a. Therefore, since the free end does not displace downward, it does not come into contact with the contact spring 54b and the switch remains off.

FIG. 4 is a perspective view showing the configuration of the finder optical system 30 capable of changing the size of the field frame.

This optical system is composed of a real image type finder optical system composed of an objective lens group 33, a Porro prism 31, and an eyepiece lens group 34. The transmission type liquid crystal plate 32 capable of displaying the field frame 32a of the above-mentioned type and the field frame 32b for the normal screen is provided so that the field frames can be electrically switched. The display of the viewing frame 32a on the large screen and the viewing frame 32b on the normal screen of the transmissive liquid crystal plate 32 are formed as shown in FIGS. 5A and 5B, respectively.

The display of the transmission type liquid crystal panel 32 is switched by a finder frame switching liquid crystal drive circuit 106 (see FIG. 20) which operates according to an instruction from the CPU 101.

FIG. 6 shows the photographing screen mask switching mechanism 4.
FIG. 2 is a diagram showing a configuration of a zero. This mask switching mechanism 40
Is arranged in the camera body 1, and the size of the mask between the large screen and the normal screen is switched by the operation of the screen size switching motor 41. The screen size switching motor 41 includes a screen size switching motor driving circuit 104 (see FIG.
0) controls the rotation. A pinion 43 is rotatably meshed with the output gear 42 of the switching motor 41, and a pinion 44 is rotatably meshed with the pinion 43. The mask frames 47 and 48 that are switched and driven by the pinions 43 and 44 are formed by opposing L-shaped frame plates, and move in a diagonal direction with respect to each other.

That is, both end portions of both mask frames 47 and 48 extend diagonally from each other, and racks 47a and 48a are formed at the edge portions extending upward. And both racks 47a, 48a
Are engaged with the pinions 43 and 44, respectively. In addition, guide elongated holes 47b, 4
8b and 47c, 48c are bored, and the respective guide elongated holes are fitted into the guide pins 45, 46.

When the screen size switching motor 41 rotates in the direction of the arrow λ1, the pinion 43 and the pinion 44 rotate in the directions of the arrows λ2 and λ3, respectively. The racks 47a and 48a of 47 and 48 are arrows λ4,
Move in the direction of λ5. Thereby, the mask frame 47 is formed.
And 48 move inward from each other to make the inside of the frame smaller,
It becomes a mask frame of the normal screen size. When the screen size switching motor 41 rotates in the direction opposite to the direction of the arrow λ1, the mask frames 47 and 48 move in the opposite direction, that is, the direction in which the inside of the frame becomes larger, so that the mask of the large photographing screen size is formed. Form.

FIG. 7 is a perspective view showing the structure of the pulse generating mechanism 60 for detecting the film feed amount.

The rotating plate 61 has the upper shaft portion 22c of the film feed amount detecting roller shaft 22 as a center axis as described above, and is interlocked with the rotation of the film feed amount detecting roller shaft 22, that is, , According to the film feed amount. A conductive material,
For example, as shown, copper foils 61a are alternately applied radially from the central axis. Although six copper foils 61a are stretched in the drawing, this is determined for the reason described later, and is not limited to this number.
Any number may be used.

On the upper surface of the rotating plate 61, a contact spring supporting portion 62 made of an elastic conductor, for example, phosphor bronze, is fixed at a predetermined position inside the camera body 1. Contact springs 63a whose bases are fixed to
63 b is disposed in a direction parallel to a tangent of the rotating plate 61. The distal ends of the contact springs 63a and 63b form a curved portion toward the upper surface of the rotary plate 61 as shown in the figure.
The contacts 3a and 63b are opposed to each other so as to contact the upper surface of the rotary plate 61. The base ends of the contact springs 63a and 63b are connected to input terminals P7 and P8 (see FIG. 20) of the CPU 101, respectively.
A pulse signal generated by a short circuit with 3b is transmitted.

When the loaded film is loaded, the film feed amount detecting roller shaft 22 rotates in accordance with the film feed amount, and interlocks with the film feed amount detecting roller shaft 22. The rotating plate 61 is the arrow λ6 in the figure.
Rotate in the direction of. At this time, the contact springs 63a, 63b
Are alternately short-circuited by the copper foil 61a to generate a pulse signal. Thus, by observing the pulse signal in the CPU 101, the feeding amount of the film can be known.

Next, the film loading when the film cartridge 58 containing the film 52b without perforation is loaded in the camera body 1 as shown in FIG. 15 will be described with reference to FIGS.

FIGS. 16 to 19 are sectional views of the film winding chamber 29 shown in FIG. 1, and show the progress of loading of the film in order.

In FIG. 16, the rear lid 26 of the camera has
Auxiliary roller arms 75a, 75b and 76a, 76b
Is attached to each base end portion so as to be swingable, and the auxiliary roller 2
4 and 25 are supported in parallel on the spool shaft 19. That is, the base end side of the support shaft 74 provided on the protrusion 26 a projecting from the inner portion of the rear lid 26 facing the film winding chamber 29 is pivotally pivoted. Is wearing
Auxiliary rollers 24 and 25 are rotatably mounted on support shafts 77 and 78 inserted between the respective distal ends.
Then, the urging spring 27 whose middle part is wound around the support shaft 74 is provided.
Of the auxiliary roller arms 75a, 76
a, the roller surface of one of the auxiliary rollers 24 contacts the film feed amount detecting rollers 22a and 22b.
The other auxiliary roller 25 is disposed so as to press against the rubber belt 20 of the spool shaft 19. These auxiliary rollers 24 and 25 both operate to assist the loading of the film 52b.

On the other hand, a concave portion is provided on the wall surface of the spool shaft 19 on the inner side of the camera body, and the auxiliary roller arm 7 is provided.
The auxiliary roller 21 is attached by 1a and 71b. That is, the auxiliary roller arm 71
The base end side of each of a and 71b is located in the recess of the camera body 1, and the base end is pivotally attached to the support shaft 70, and the front end is a spool shaft in the film winding chamber 29. 1
9 and a film feed amount detecting roller shaft 22. The auxiliary roller arms 71a, 71b
The auxiliary roller 21 is rotatably mounted on a support shaft 73 mounted in parallel with the spool shaft 19 between the distal ends of the auxiliary rollers 21. The support shaft 70 is wound in the middle, one end is hung on the auxiliary roller arm 71a, and the other end is
The auxiliary roller 21 by the urging spring 72
Is disposed such that its roller surface is in contact with the rubber belt 20. The auxiliary roller 21 serves to assist the spool shaft 19 when the film 52b is loaded by the rotation of the spool shaft 19.

First, as shown in FIG. 15, a film cartridge 58 without perforation is loaded, the film 52b is pulled out and mounted, and the rear lid 26 is closed.
This film 52b is arranged at a position as shown in FIG. That is, the film 52b is
Is held between the rubber belt 20 wound around the rubber belt 20 and the auxiliary roller 25 which gives the rubber belt 20 a press contact property by the urging spring 27. When the rear lid 26 is closed, the rear lid switch 103 (see FIG. 20) is turned on to start loading, as described later. That is, the spool shaft 19 rotates in the direction of arrow λ7,
And the auxiliary roller 25 rotate in the directions of arrows .lambda.7 and .lambda.8, respectively.
18 is wound around the spool shaft 19.

At this time, that is, the film 52b
When the loading of the film cartridge 5 has been performed, the film cartridge 5
8, the shape of the spool shaft 5b is determined, and the film feed amount of the film 52b is measured by the pulse generating mechanism 60 for detecting the film feed amount. Then, when the feeding amount reaches a predetermined amount, the loading is stopped,
Enter the release standby state. Film 52b at this time
19 is shown in FIG.

FIG. 20 is an electric circuit block diagram showing the configuration of the CPU 101 for controlling the operation of the camera of this embodiment and its peripheral circuits.

The CPU 101 is a controller for controlling the electric circuit of the camera according to the present embodiment.
2 is connected to a release switch 102, and the terminals P3 and P4 are connected to the rear cover switch 103. The input terminals P5 and P6 are connected to the contact springs 54a and 54a, respectively.
The switch composed of the contact springs 63a and 63b is connected to the terminals P7 and P8, respectively. The CPU 101 constantly monitors signals input to the input terminals described above, and when a predetermined signal is input to these input terminals, performs an operation (described later) in accordance with the signal. I have.

Further, the output terminals P9, P9 of the CPU 101
10, P11 and P12 are connected to the screen size switching motor drive circuit 104, the finder frame switching liquid crystal drive circuit 106, the film winding / rewinding drive circuit 107, and the shutter drive circuit 109, respectively. The CPU 101 processes the signals input to the input terminals and controls these drive circuits.

Driving Circuit 1 for Screen Size Switching Motor
Reference numeral 04 denotes the screen size switching motor 41 at its output end.
Are connected, and drive control of the switching motor 41 is performed as described above. The finder frame switching liquid crystal driving circuit 106 is connected to the transmission type liquid crystal plate 32 at its output end, and controls the screen display of the transmission type liquid crystal plate 32 as described above. The film winding / rewinding drive circuit 107 is connected to a film winding / rewinding motor 108 at an output end thereof, and controls the driving of the motor 108 as described above. The shutter drive circuit 10
Reference numeral 9 denotes a shutter 110 connected to the output end of the shutter 9, which controls opening and closing of the shutter.

The operation of the camera according to the first embodiment thus configured will be described with reference to the flowchart of FIG.

First, the patrone loading chamber 11 of the camera body 1
Then, a 135-type film cartridge 5 is loaded, the film 52a is pulled out from the film cartridge 5 to the above-described predetermined position, and the rear cover 26 is closed. Then, the rear cover switch 103 is turned on, and an ON signal is input to the CPU 101 (step S1). Thereby, the CPU 101
Outputs a control signal from the output terminal P11, and the film winding / rewinding motor 108 is rotated by the film winding / rewinding drive circuit 107 receiving the control signal, and the idle feeding of the film 52a is started (step S11). S2).

During the idle feeding, the CPU 101
In step S3, the shape of the spool shaft of the loaded film cartridge is detected by the patrol pool shaft shape detecting unit 23 (step S3), whereby the identification of the film stored in the film cartridge, that is, the presence or absence of perforation Is identified (step S4). In response to this result, the CPU 101 outputs a control signal from the output terminal P10 to switch the finder frame switching liquid crystal driving circuit 1
06 is operated to switch the display of the transmission type liquid crystal panel 32 (step S5). At the same time, the CPU 101
A control signal is output from the output terminal P9, the screen size switching motor driving circuit 104 is operated, and the screen size switching motor 41 is rotated to set the photographing screen size to a predetermined size (step S6).

If there is no perforation in the film, the CPU 101 instructs the screen display of the transmissive liquid crystal panel 32 to be as shown in FIG. For example, the mask size of 40 was increased, specifically, 29 mm × 40.7
Instruct to be 5mm. At the same time, the CPU 101 sets the film winding / rewinding drive circuit 107 to increase the feed amount per frame of the film 52b (step S).
7).

Here, one example of setting the feed amount will be described.

FIG. 24 has perforations,
FIG. 11 is a diagram in which the state of a screen a when shooting is performed using a normal film 52a is indicated by oblique lines. As shown in this figure, the photographing screen size is 24 mm × 36 mm, and the interval between the photographing screen sizes is 2 mm. Therefore, the film feed amount per frame is 38 mm. At this time, the film feed amount detection roller shaft 22 rotates 2.7 times,
The diameters of the detection rollers 22a and 22b are determined so that the pulse generation mechanism 60 for detecting the film feed amount generates 16 pulse signals per film.

FIG. 25 is a diagram in which the state of the screen b when the photographing is performed using the film 52b or 52c without perforation is indicated by oblique lines. As shown in this figure, the photographing screen size is, for example, 29 mm ×
Assuming that 40.75 mm and the interval between each photographing screen size are 2 mm, the film feed amount per frame is 42.75 mm.
Becomes Therefore, if the diameters of the film feed amount detection rollers 22a and 22b are determined as described above, the detection rollers
2a and 22b rotate three times per film, and the number of pulse signals generated by the pulse generation mechanism 60 for detecting the film feed amount becomes 18 pieces.

In this way, the CPU 101 sets the count of the pulse signal from the pulse generation mechanism 60 for detecting the film feed amount to 18 and feeds the film 52b or 52c by one frame. (Step S7).

Film 52a with perforation
In this case, that is, when a normal film cartridge is loaded, the CPU 101 instructs the screen display of the transmissive liquid crystal panel 32 to be as shown in FIG. 5B and the photographing screen mask switching mechanism. An instruction is given to reduce the size of the 40 mask frames, specifically, to set the size to 24 mm × 36 mm. At the same time, the CPU 1
The reference numeral 01 designates a small feed amount per frame of the film 52a with respect to the film winding / rewinding drive circuit 107, and more specifically, as described above, the pulse generating mechanism for detecting the film feed amount. It is set so that the count number of the pulse signal from 60 is 16 and one frame is fed. Thus, when a normal film cartridge, that is, a film 52a having a perforation is loaded, a normal photographing screen a can be photographed similarly to a general camera.

Returning to FIG. 21, the operation of the CPU 101 will be described.

By the step S7, the initial operation of the camera is completed, and the camera enters a release standby state (step S8). Thereafter, when the release switch 102 is turned on, the CPU 101 outputs a control signal from the output terminal P12 to operate the shutter drive circuit 109 to open and close the shutter 110 (step S9).
Thereafter, the film winding / rewinding motor 108 is rotated to feed the film one frame (step S1).
0), the end of the film of the film is detected (step S11).

If the end of the film is not detected in step S11 and there is still a remaining amount of the film, the flow returns to step S8 to enter a release standby state. on the other hand,
When the end of the film is detected in step S11,
The CPU 101 controls the film winding / rewinding drive circuit 1
07 to rewind the film (step S
12).

Next, a photographing screen size switching camera according to a second embodiment of the present invention will be described.

The camera of the first embodiment uses a film cartridge in which the length of projection of the spool shaft to the outside as shown in FIG. 9 is displaced as a film cartridge for storing a film without perforation. The camera of the second embodiment differs from the first embodiment in that a camera in which the diameter of the spool shaft 5c of the film cartridge 59 is displaced as shown in FIG. Therefore,
In the camera of the second embodiment, only the patrone spool shaft shape detecting unit, that is, only the patrone pool shaft shape detecting unit 23a (shown by a broken line) in FIG.
This is different from the embodiment.

FIGS. 13 and 14 are views showing the configuration and operation of the shape detecting portion 23a of the spool shaft 5c of the film cartridge 59. FIG. 13 is an enlarged view of the main part of the lower part of the cartridge loading chamber 11 as viewed from above. It is sectional drawing.

FIG. 13 shows that the patrone loading chamber 11
FIG. 7 is a diagram showing a state of the patrol pool axis shape detecting unit 23a when a normal 135-type film cartridge 5 is loaded.

As shown in the figure, the patrone pool axis shape detecting section 23a is provided below the patrone loading chamber 11 and is provided with the contact spring 54 in the first embodiment.
It is composed of a switch composed of two contact springs 56a and 56b, which are two strip-shaped elastic conductive plates having the same material and shape as those of the first and second a and b. These contact springs 56a, 56
b are opposed to each other, and the bases thereof are fixed to an insulating member 57b. The bottom of the patrone loading chamber 11 and the central wall 55 of the patrone loading chamber 11 of the camera body 1 are opposed to each other.
Is inserted through and fixed to a through hole 57a formed in the back of the intersection of the camera body 1, that is, on the front side of the camera body 1. And
The distal ends of the contact springs 56a and 56b extend along the bottom surface of the cartridge loading chamber 11.

The tip of one contact spring 56a of the two contact springs 56a, 56b has its apex facing the peripheral surface of the spool shaft 5a of the film cartridge 5 or the spool shaft 5c of the film cartridge 59. The apex portion serves as a contact point, and is arranged so as to face the contact point of the other contact spring 56b. The base end of the contact spring 56a is C
It is connected to the input terminal P5 of the PU 101 (see FIG. 20).

The tip of the other contact spring 56b is
It is disposed so as to be located between the tip of the contact spring 56a and the spool shaft 5a or 5c. Only when the normal film cartridge 5 (see FIG. 8) is loaded into the cartridge loading chamber 11, the tip of the contact spring 56b is pressed, and the switch comes into contact with the contact of the contact spring 56a. It has become. That is, when the film cartridge 5 is loaded, the peripheral surface of the spool shaft 5a of the film cartridge 5 presses the tip of the contact spring 56b and displaces the tip to the front. The contact is brought into contact with the apex of the curved portion of the contact spring 56a to turn on the switch.

The base end of the contact spring 56b is connected to the CP
The type of the film cartridge loaded with the CPU 101 (that is, whether or not the film is perforated) is connected to the input terminal P6 of U101 (see FIG. 20), and the presence or absence of a short circuit between the contact spring 56b and the contact spring 56a is determined. It can be detected.

FIG. 14 shows that the patrone loading chamber 11
10 shows a state of the patrol pool shaft shape detecting unit 23a when the film cartridge 59 having a small diameter of the patrol pool shaft (see FIG. 10) is loaded.

In this case, since the diameter of the spool shaft 5c of the loaded film cartridge 59 is small, as shown in FIG.
It does not contact the tip of b. Therefore, since the tip does not displace forward, there is no contact with the contact spring 56a, and the switch remains off.

The operation of the camera according to the second embodiment thus configured is the same as that of the first embodiment.
The effect is the same.

FIG. 22 is a view showing a film 52d in which perforations are provided only in the leader portion 52da at the leading end of the film without perforation in order to more reliably perform film loading. FIGS. 23A and 23B show the spool shaft 1.
9 is an explanatory view of the spool shaft 19a provided with a film catching claw 19b as shown in FIG.
Is a rear view of the film winding chamber 29a in which the spool shaft 19a is disposed, and FIG.
FIG.

When the film 52d is mounted on the camera body 1 and loaded, the perforation in the leader portion 52da is hooked on the film hooking claw 19b of the spool shaft 19a and the film is wound, so that reliable loading can be performed. .

[0090]

According to the present invention described above, according to the present invention, pre-film patrols by Rondane to have differences, and to distinguish a film that does not exist with the existing set of film perforations in accordance with the difference When perforations exist in the film loaded in the camera body, the above JIS standard B7
24mm x 36m specified by 115 etc.
It is possible to provide a photographing screen size switching camera capable of photographing with a photographing screen size of m 2 and, similarly, when there is no perforation in the loaded film, photographing with a photographing screen size larger than the standard size.

[Brief description of the drawings]

FIG. 1 is a rear view of a photographing screen size switching camera showing first and second embodiments of the present invention.

FIG. 2 is a front view of the photographing screen size switching camera according to the first and second embodiments.

FIG. 3 is a vertical sectional view of a mask section in FIG. 1;

FIG. 4 is a perspective view of a finder optical system used in the camera of the embodiment.

FIGS. 5A and 5B respectively show a viewfinder field frame in the camera of the embodiment, wherein FIG. 5A is a front view of the field frame at the time of shooting a large screen, and FIG.

FIG. 6 is a front view of a photographing screen mask switching mechanism in the camera of the embodiment.

FIG. 7 is a perspective view of a main part of a pulse generation mechanism for detecting a film feeding amount in the camera of the embodiment.

FIG. 8 is a front view showing a normal 35 mm wide film having perforations.

FIG. 9 is a front view showing an example of a film cartridge accommodating a 35 mm wide film without perforation.

FIG. 10 is a front view showing another example of a film cartridge accommodating a 35 mm wide film without perforation.

FIG. 11 is an enlarged sectional view of an essential part showing an operation state of the patrol pool axis shape detecting unit in the first embodiment of the camera for switching the photographing screen size.

FIG. 12 is an enlarged cross-sectional view of a main part of the camera for switching the photographing screen size, showing a non-operation state of the patrol pool axis shape detecting unit in the first embodiment.

FIG. 13 is an enlarged cross-sectional view of a main part showing an operation state of a patrol pool axis shape detecting unit in the second embodiment of the camera for switching the photographing screen size.

FIG. 14 is an enlarged cross-sectional view of a main part of the camera for switching photographing screen sizes, showing a non-operating state of the patrol pool axis shape detecting unit in the second embodiment.

FIG. 15 is a rear view of the camera showing a state where the film without perforation shown in FIG. 9 is loaded.

FIG. 16 is an essential part cross sectional view showing a state of film loading in the camera of the embodiment.

FIG. 17 is an essential part cross sectional view showing a state of film loading in the camera of the embodiment.

FIG. 18 is an essential part cross sectional view showing a state of film loading in the camera of the above embodiment.

FIG. 19 is an essential part cross sectional view showing a state of film loading in the camera of the embodiment.

FIG. 20 is a block diagram showing a configuration of an electric circuit in the camera of the embodiment.

FIG. 21 is a flowchart showing the operation of the camera according to the embodiment.

FIG. 22 is a front view showing a 35 mm-wide film in which perforations are provided only in the leader portion of the film.

23 (a) and (b) are a front view and a cross-sectional view of a take-up spool shaft for winding the leader of the film of FIG. 19;

FIG. 24 is a front view showing a photographing screen of a film having perforations.

FIG. 25 is a front view showing a photographing screen of a film without perforation.

26 (a) and (b) are front views showing dimensions of a perforated ordinary film according to JIS standards.

FIG. 27 is a front view and both side views showing dimensions according to JIS standards of a film cartridge of a normal 35 mm width roll film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera main body 2 ... Release button 5, 58, 59 ... Film patrone 5a, 5b, 5c ... Film patrone pool axis 11 ... Patrone loading chamber 12 ... Fork part 13 ... Finder eyepiece part 14 ... Mask part 15, 16, 17 , 18 ... Film rail 19 ... Spool shaft 20 ... Rubber belt 21 ... Auxiliary roller 22 ... Film feeding amount detecting roller shaft 22a, 22b ... Film feeding amount detecting roller 23 ... Patrolness pool shaft shape detecting unit 29 ... Film winding Room 30: Viewfinder optical system 40: Photographing screen mask switching mechanism 52a: Film with perforations 52b, 52c: Film without perforations 60: Pulse generation mechanism for film feed amount detection

Claims (3)

(57) [Claims] 1. A first type in which a first type of film is incorporated.
And a second type of patrone in which a second type of film is built-in. The camera according to the first type of film, wherein A photographing screen size setting unit capable of switching between a first screen size and a second screen size according to an image recording area of the second type film; a cartridge determining unit for determining a type of the cartridge; Upon receiving the output of the patrone discriminating means, when the first kind of patrone is loaded, the photographing screen size set by the photographing screen size setting means is set to the first screen size, and the second kind of patrone is set. Switching means for setting the photographing screen size set by the photographing screen size setting means to the second screen size when is loaded; A photographing screen size switching camera comprising: 2. The photographing screen size switching camera according to claim 1, wherein said patrone discriminating means discriminates a shape of a film winding spool shaft provided on said patrone. 3. A first type of patrone in which a film provided with a perforation on a side edge portion is incorporated, and a film in which a perforation is not provided is incorporated, and the shapes of the patrone and the spool shaft are changed. A camera which can selectively load the second type of patrone, wherein at least a first screen size having a screen area inside the perforations and an area corresponding to the perforations are also screen areas. A screen size setting device capable of switching to a second screen size; a spool shaft determining device for determining the shape of the spool shaft; receiving the output of the spool shaft determining device, and loading the first type of patrone; When the shooting screen size set by the shooting screen size setting means is set to the first screen size. Switching means for setting the photographing screen size set by the photographing screen size setting means to the second screen size when the second type of patrone is loaded. Size switching camera.